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Journal articles on the topic 'Digital Multi Meter'
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1
Fu, Li Hui, Jun Feng Dai, and Hua Li. "The Design of Digital and Multi-Function Watt-Hour Meter." Applied Mechanics and Materials 392 (September 2013): 750–54. http://dx.doi.org/10.4028/www.scientific.net/amm.392.750.
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In this paper, a multi-function watt-hour meter which has the function of time-sharing charging, remote meter reading and IC pre-payment is put forward.ADE7755 is the heart of measurement circuit which can sample the voltage and current of the usercircuit,calculate the instantaneous power,real time clock chip DS1302 in the system which can provide accurate standard of time for time-sharing charging, the nonvolatile memory AT24C04 is used to store the electric power bill information and other working parameters, the infrared communication interface is used remote meter reading. The whole watt-hour meter is a pure electronic measuring instrument without any mechanical part, it is working reliably, simple and flexible in use.
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Li, Xiao Zhen, Jian Lin Zhang, Wen Sheng Zou, and Yao Ming Kang. "Intelligent Digital Voltage Meter Design and Implement Based on AD7715." Advanced Materials Research 490-495 (March 2012): 1176–80. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.1176.
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AD7715 is a high accuracy A/D converts chip made by American company Analog – Devices which involves a programmable gain amplifier, a programmable digital filter. It employs the Σ-Δ ADC technology to realize the 16-bits accurate measurement. The voltage meter uses 89C55 SCM as control, uses analog switch to conduct multi switch for measured voltage through signal conditioning, uses new 16-bit A/D convert to sample measured voltage being conditioned, uses 128 X 64 dot-matrix LCD as display screen to show the wave and Chinese words. This article mainly introduces the means of applying AD7715 chips to design accurate voltage meter.
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Vizvari, Zoltan, Tibor Kiss, Csaba Ver, et al. "A multi-chanel electrical impedance meter based on digital lock-in technology." Pollack Periodica 14, no. 2 (2019): 211–22. http://dx.doi.org/10.1556/606.2019.14.2.19.
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Wang, Hong Ping, and Zheng Tao. "The Design of Digital Multi-Meter Automation Metrology System Based on 5720A Multifunction Calibrator." Advanced Materials Research 846-847 (November 2013): 643–46. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.643.
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This passage indicate the design of the software which can let 5720A multifunction calibrator automatically measure the digital multi-meter, and describe the control processes, hardware structure, software design and other key technologies of this system specifically.
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Li, Gang. "A Special Nonlinear Processing Method of Precise Digital Temperature Measurement with Platinum Thermistor." Advanced Materials Research 562-564 (August 2012): 1745–48. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.1745.
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The nonlinear rectifying method is widely used for improving the accuracy of temperature measurement. Using industrial platinum thermistor, DT-1000 digital multi-meter and other common components, a special nonlinear processing method puts forward to achieving high accuracy digital temperature measurement within the medium temperature range. The result shows the effectiveness of the method.
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Li, Xiang, Jun Zhao, Changchang Zeng, Yong Yao, Sen Zhang, and Suixian Yang. "Deep Learning-Based Pointer Meter Reading Recognition for Advancing Manufacturing Digital Transformation Research." Sensors 25, no. 1 (2025): 244. https://doi.org/10.3390/s25010244.
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With the digital transformation of the manufacturing industry, data monitoring and collecting in the manufacturing process become essential. Pointer meter reading recognition (PMRR) is a key element in data monitoring throughout the manufacturing process. However, existing PMRR methods have low accuracy and insufficient robustness due to issues such as blur, uneven illumination, tilt, and complex backgrounds in meter images. To address these challenges, we propose an end-to-end PMRR method based on a decoupled circle head detection algorithm (YOLOX-DC) and a Unet-like pure Transformer segmentation network (PM-SwinUnet). First, according to the characteristics of the pointer dial, the YOLOX-DC detection algorithm is designed based on the exceeding you only look once detector (YOLOX). The decoupled circle head of YOLOX-DC detects the pointer meter dial more accurately than the commonly used rectangular detection head. Second, the window multi-head attention of the PM-SwinUnet network enhances the feature extraction ability of pointer meter images and solves problems of missed scale detection and incomplete pointer segmentation. Additionally, the scale and pointer fitting module is introduced into the PM-SwinUnet to locate the accurate position of the scale and pointer. Finally, through the angle relationship between the pointer and the first two main scale lines, the pointer meter reading is accurately calculated by the improved angle method. Experimental results demonstrate the effectiveness and superiority of the proposed end-to-end method across three-pointer meter datasets. Furthermore, it provides a rapid and robust approach to the digital transformation of manufacturing systems.
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Septianingsih, Dwi, Isra Amalia, Septi Johan, and Liza Lidiawati. "Kajian Perubahan Garis Pantai Kabupaten Bengkulu Utara dengan Interpretasi Citra Penginderaan Jauh dan Digital Shoreline System." Jurnal Fisika Unand 14, no. 3 (2025): 218–27. https://doi.org/10.25077/jfu.14.3.218-227.2025.
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Wilayah pesisir Bengkulu Utara sering mengalami proses abrasi dan akresi, mengingat lokasinya yang menghadap langsung ke perairan luas Samudra Hindia. Fenomena ini dapat berdampak pada perubahan garis pantai di daerah tersebut. Penelitian ini bertujuan untuk mengidentifikasi perubahan garis pantai seiring waktu dengan memanfaatkan citra satelit multi sensor dari USGS. Fokusnya adalah untuk mengukur perubahan jarak wilayah pesisir di Kabupaten Bengkulu Utara. Perubahan garis pantai di wilayah ini dihitung secara statistik menggunakan Digital Shoreline Analysis System (DSAS). Hasil perhitungan rata-rata dari jarak perubahan garis pantai mulai dari tahun 2014 hingga 2023 di Kabupaten Bengkulu Utara dipengaruhi oleh abrasi dan akresi yang cukup besar sejauh -20,31 meter dan 21,6 meter. Dampak akresi menunjukkan nilai lebih tinggi dari abrasi karena adanya penambahan daratan (sedimentasi) di sejumlah muara sungai di Kabupaten Bengkulu Utara. Perubahan garis pantai dipengaruhi oleh dinamika angin musiman dan gelombang laut akibat Monsun Timur dan Barat, berdampak pada pemukiman pesisir, infrastruktur, serta ekosistem seperti terumbu karang dan hutan mangrove.
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Chu, Hone-Jay, Yi-Chin Chen, Muhammad Ali, and Bernhard Höfle. "Multi-Parameter Relief Map from High-Resolution DEMs: A Case Study of Mudstone Badland." International Journal of Environmental Research and Public Health 16, no. 7 (2019): 1109. http://dx.doi.org/10.3390/ijerph16071109.
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Topographic parameters of high-resolution digital elevation models (DEMs) with meter to sub-meter spatial resolution, such as slope, curvature, openness, and wetness index, show the spatial properties and surface characterizations of terrains. The multi-parameter relief map, including two-parameter (2P) or three-parameter (3P) information, can visualize the topographic slope and terrain concavities and convexities in the hue, saturation, and value (HSV) color system. Various combinations of the topographic parameters can be used in the relief map, for instance, using wetness index for upstream representation. In particular, 3P relief maps are integrated from three critical topographic parameters including wetness or aspect, slope, and openness data. This study offers an effective way to explore the combination of topographic parameters in visualizing terrain features using multi-parameter relief maps in badlands and in showing the effects of smoothing and parameter selection. The multi-parameter relief images of high-resolution DEMs clearly show micro-topographic features, e.g., popcorn-like morphology and rill.
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Lu, Wen Jia, Yi Wei, and Yi Fan Zhao. "Design and Linear Fitting of High Sensitive Optical Power Meter." Advanced Materials Research 171-172 (December 2010): 429–32. http://dx.doi.org/10.4028/www.scientific.net/amr.171-172.429.
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This paper introduces the hardware design of digital optical power meters and the algorithm flow.The power meter detector, with InGaAs-PIN photodiode and LTC6078,is used as a preamplifier for the measurement of micro-current;Silicon Laps C8051f410 are selected as the micro-controller for AD quantification and data processing, and the linear fitting of the measured data and standard data is completed in Matlab environment.After the comparison between the two measurement results,the proposed optical power meter adopts certain algorithm to compensate the deviation and improve the overall performance.The analyses of measured data show that:the optical power meter can be designed to precisely measure multi-wavelength with wide dynamic range and high sensitivity,support AC and DC dual power supply,and be portable.Therefore It also can be used both by university laboratories for teaching and by government department for construction monitoring and optical communications maintenance.
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Li, Ya Mei, and Ping Liang. "The System of Liquid Level Detection." Applied Mechanics and Materials 182-183 (June 2012): 511–14. http://dx.doi.org/10.4028/www.scientific.net/amm.182-183.511.
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The design is a ultrasonic level meter based on the PIC18F4520 micro chip. This ultrasonic level meter can be achieved in data is not lost when the power is down, making multi-function button to change the value, accurate measurement of liquid level. Closed loop fixed gain amplifier and the echo peak calibration signal amplification technology eliminates the phase shift error and the amplitude fluctuation error of the method, and digital potentiometers to achieve the system's automatic gain control, improve the quality of the echo signal. The effect of design is good, especially in sewage treatment, and oil storage tank system that can not contact measuring system have a strong value in use.
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BUYRUK, H. M., W. P. J. HOLLAND, C. J. SNIJDERS, et al. "Tendon Excursion Measurements With Colour Doppler Imaging." Journal of Hand Surgery 23, no. 3 (1998): 350–53. http://dx.doi.org/10.1016/s0266-7681(98)80056-9.
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We assessed the applicability of tendon excursion measurement by means of Colour Doppler Imaging (CDI) on human specimens, and also assessed the correlation between values measured by Doppler and by displacement meters. Muscles were separately connected to a mass of 1 kg with a steel wire running over a pulley. This weight moved the telescopic end of a digital displacement meter up and down during passive extension and flexion of the fingers. Excursion was measured with a pulsed multi-channel CDI scanner on the same arm. Assessment of finger tendon excursion with CDI correlated well with the mechanical micro displacement meter, the latter being considered the most accurate method in cadaver studies.
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Chang, K. T., J. Dou, Y. Chang, C. P. Kuo, K. M. Xu, and J. K. Liu. "SPATIAL RESOLUTION EFFECTS OF DIGITAL TERRAIN MODELS ON LANDSLIDE SUSCEPTIBILITY ANALYSIS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B8 (June 22, 2016): 33–36. http://dx.doi.org/10.5194/isprs-archives-xli-b8-33-2016.
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The purposes of this study are to identify the maximum number of correlated factors for landslide susceptibility mapping and to evaluate landslide susceptibility at Sihjhong river catchment in the southern Taiwan, integrating two techniques, namely certainty factor (CF) and artificial neural network (ANN). The landslide inventory data of the Central Geological Survey (CGS, MOEA) in 2004-2014 and two digital elevation model (DEM) datasets including a 5-meter LiDAR DEM and a 30-meter Aster DEM were prepared. We collected thirteen possible landslide-conditioning factors. Considering the multi-collinearity and factor redundancy, we applied the CF approach to optimize these thirteen conditioning factors. We hypothesize that if the CF values of the thematic factor layers are positive, it implies that these conditioning factors have a positive relationship with the landslide occurrence. Therefore, based on this assumption and positive CF values, seven conditioning factors including slope angle, slope aspect, elevation, terrain roughness index (TRI), terrain position index (TPI), total curvature, and lithology have been selected for further analysis. The results showed that the optimized-factors model provides a better accuracy for predicting landslide susceptibility in the study area. In conclusion, the optimized-factors model is suggested for selecting relative factors of landslide occurrence.
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Chang, K. T., J. Dou, Y. Chang, C. P. Kuo, K. M. Xu, and J. K. Liu. "SPATIAL RESOLUTION EFFECTS OF DIGITAL TERRAIN MODELS ON LANDSLIDE SUSCEPTIBILITY ANALYSIS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B8 (June 22, 2016): 33–36. http://dx.doi.org/10.5194/isprsarchives-xli-b8-33-2016.
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The purposes of this study are to identify the maximum number of correlated factors for landslide susceptibility mapping and to evaluate landslide susceptibility at Sihjhong river catchment in the southern Taiwan, integrating two techniques, namely certainty factor (CF) and artificial neural network (ANN). The landslide inventory data of the Central Geological Survey (CGS, MOEA) in 2004-2014 and two digital elevation model (DEM) datasets including a 5-meter LiDAR DEM and a 30-meter Aster DEM were prepared. We collected thirteen possible landslide-conditioning factors. Considering the multi-collinearity and factor redundancy, we applied the CF approach to optimize these thirteen conditioning factors. We hypothesize that if the CF values of the thematic factor layers are positive, it implies that these conditioning factors have a positive relationship with the landslide occurrence. Therefore, based on this assumption and positive CF values, seven conditioning factors including slope angle, slope aspect, elevation, terrain roughness index (TRI), terrain position index (TPI), total curvature, and lithology have been selected for further analysis. The results showed that the optimized-factors model provides a better accuracy for predicting landslide susceptibility in the study area. In conclusion, the optimized-factors model is suggested for selecting relative factors of landslide occurrence.
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Wang, Xian Wei, Zheng Qian, Shuang Shu Tian, and Yong Jie Qiu. "Design of Three-Phase Reference Energy Meter Based on FPGA and ARM." Advanced Materials Research 986-987 (July 2014): 1804–8. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1804.
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Compared with the normal energy meters which use the integrated measurement chip as the key component, the three-phase reference energy meter based on FPGA and ARM possesses the advantages of high precision. And compared with the energy meters which use DSP as the key part, it has the advantages of small volume and multi-parameter measurement. The design method of three-phase reference energy meter integrating FPGA with ARM is presented in this paper. And the individual miniaturization design are discussed, the key parts during the realization are also discussed. After that, two kinds of electric energy metrological algorithm which are digital differential and instantaneous IV are introduced according to the characteristic of the system, and the advantages and disadvantages of them are compared. All this work will provide powerful foundation for the engineering applications of design method.
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Pei, Xin, Jian Li, Na Wang, et al. "Design of a multi-function high-speed digital baseband data acquisition system." Research in Astronomy and Astrophysics 21, no. 10 (2021): 248. http://dx.doi.org/10.1088/1674-4527/21/10/248.
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Abstract A multi-function digital baseband data acquisition system is designed for the sampling, distribution and recording of wide-band multi-channel astronomical signals. The system hires a SNAP2 board as a digital baseband converter to digitize, channelize and packetize the received signal. It can be configured dynamically from a single channel to eight channels with a maximum bandwidth of 4096 MHz. Eight parallel HASHPIPE instances run on four servers, each carrying two NVMe SSD cards, achieving a total continuous write rate of 8 GB s−1. Data are recorded in the standard VDIF file format. The system is deployed on a 25-meter radio telescope to verify its functionality based on pulsar observations. Our results indicate that during the 30-minute observation period, the system achieved zero data loss at a data recording rate of 1 GB s−1 on a single server. The system will serve as a verification platform for testing the functions of the QTT (QiTai radio Telescope) digital backend system. In addition, it can be used as a baseband/VLBI (Very Long Baseline Interferometry) recorder or D-F-engine of correlator/beamformer as well.
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OSADCHUK, Alexsandr, Jaroslav OSADCHUK, and Valentin SKOSCHUK. "MULTICHANNEL FREQUENCY METER ON A PROGRAMMABLE LOGICAL INTEGRATED CIRCUIT FOR A RADIOMEASURING SYSTEM WITH FREQUENCY SENSORS." Herald of Khmelnytskyi National University 303, no. 6 (2021): 186–94. http://dx.doi.org/10.31891/2307-5732-2021-303-6-186-194.
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The paper presents the development of a multi-channel frequency measurement system on FPGA by Altera Cyclone IV, the main task of which is to measure the informative parameter of sensors of physical quantities with frequency output. Based on the analysis of existing multi-channel frequency measurement systems on the FPGA, it is established that it is advisable to use multi-channel frequency meters for simultaneous measurement of several frequencies. Unlike several frequency meters operating simultaneously, multi-channel frequency meters perform measurements in a single time base, which is provided by a common exemplary generator and timer. A multi-channel universal FPGA-based measuring device has been developed, which has 12 measuring channels for frequency output sensors and supports simultaneous operation of 127 digital sensors via I2C interface. Therefore, theoretically, data transmission from the developed device can be carried out wirelessly. The developed device can be connected to a personal computer via a UART-USB converter. As a chip for the implementation of the frequency meter is used FPGA company Altera EP4CE10F17C8 – a chip in the BGA case, which has 179 pins. The parameters, namely the value of the signal propagation delay, determine the maximum measured frequency, in our case about 3 ns (delay of the signal from the input to the internal register), which corresponds theoretically to 333 MHz. Specialized software has been developed to test the efficiency of a multi-channel measuring system for measuring informative parameters obtained from radio measuring transducers, based on the reactive properties of semiconductor structures with negative resistance. For convenience of perception, there is a visualization of the received information from the measuring device.
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Genwa, K. R., and Hari Prasad. "Innovative Study of Photogalvanics in Solar Energy Transformation and Performance Analysis: Alizarin Cyanine Green, EDTA and Sodium Stearate System." Oriental Journal Of Chemistry 39, no. 2 (2023): 372–77. http://dx.doi.org/10.13005/ojc/390216.
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A systematic analysis of experimentally, solar parameters of photogalvanics has been studied for performance analysis using the D-R-S (Dye-Reductant–Surfactant) system as alizarin cyanine green–EDTA- sodium stearate system. A H shaped photogalvanic system was used under investigation for innovative results. Different scientific instruments were used in methodology set up i.e., microammeter, digital pH meter, and light source (200 W Philips bulb), multi-meter, calomel electrode (saturated), Pt electrode, and circuit key. The photogalvanic parameters were studied using H cell glass tubes as PP (Photo-Potential), PC (Photo-Current), CF (Conversion Efficiency), FF (Fill-Factor) & PA (Performance Analysis). The experimental results are as follows: 733.0 mV, 477.0 mA, 1.7984%, 0.2640 and 180.0 minutes. The observed electrical outputs are better than previously published electrical outputs with respect to alizarin cyanine green, EDTA, and sodium stearate system.
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Guan, Songwen, Zhitian Niu, Ming Kong, Shiling Wang, and Hangbo Hua. "EDPNet (Efficient DB and PARSeq Network): A Robust Framework for Online Digital Meter Detection and Recognition Under Challenging Scenarios." Sensors 25, no. 8 (2025): 2603. https://doi.org/10.3390/s25082603.
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Challenges such as perspective distortion, irregular reading regions, and complex backgrounds in natural scenes hinder the accuracy and efficiency of automatic meter reading systems. Current mainstream approaches predominantly utilize object-detection-based methods without optimizing for text characteristics, while enhancements in detection robustness under complex backgrounds typically focus on data preprocessing rather than model architecture. To address these limitations, a novel end-to-end framework, i.e., EDPNet (Efficient DB and PARSeq Network), is proposed to integrate efficient boundary detection and text recognition. EDPNet comprises two key components, EDNet for detection and EPNet for recognition, where EDNet employs EfficientNetV2-s as its backbone with the Multi-Scale KeyDrop Attention (MSKA) and Efficient Multi-scale Attention (EMA) mechanisms to address perspective distortion and complex background challenges, respectively. During the recognition stage, EPNet integrates a DropKey Attention module into the PARSeq encoder, enhancing the recognition of irregular readings while effectively mitigating overfitting. Experimental evaluations show that EDNet achieves an F1-score of 0.997988, outperforming DBNet++ (ResNet50) by 0.61%. In challenging scenarios, EDPNet surpasses state-of-the-art methods by 0.7~1.9% while reducing parameters by 20.03%. EPNet achieves 90.0% recognition accuracy, exceeding the current best performance by 0.2%. The proposed framework delivers superior accuracy and robustness in challenging conditions while remaining lightweight.
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d’Angelo, P., and P. Reinartz. "DIGITAL ELEVATION MODELS FROM STEREO, VIDEO AND MULTI-VIEW IMAGERY CAPTURED BY SMALL SATELLITES." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2021 (June 28, 2021): 77–82. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2021-77-2021.
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Abstract. Small satellites play an increasing role in earth observation. This article evaluates different possibilities of utilizing data from Planet’s SkySat and PlanetScope satellites constellations for derivation of digital elevation models. While SkySat provides high resolution image data with a ground sampling distance of up to 50 cm, the PlanetScope constellation consisting of Dove 3U cubesats provide images with a resolution of around 4 m. The PlanetScope acquisition strategy was not designed for stereo acquisitions, but for daily acquisition of nadir viewing imagery. Multiple different products can be acquired by the SkySat satellites: Collects covering an area of usually 12 by 6 km, tri-stereo collects and video products with a framerate of 30 Hz. This study evaluates DSM generation using a Semi-Global Matching from multi date stereo pairs for SkySat and PlanetScope, and the dedicated Video and tri-stereo SkySat acquisitions. DSMs obtained by merging many PlanetScope across track stereo pairs show an normalized median deviation against LiDaR first pulse data of 5.2 meter over diverse landcover at the test sites around the city of Terrassa in Catalonia, Spain. SkySat tri-stereo products with 80 cm resolution reach an NMAD of 1.3 m over Terrassa.
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Dai, Yue, Liang Chen, Xin Zhou, Yanlin Ruan, and Ruizhi Chen. "Indoor Localization in Commercial 5G Environment with Single BS." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVIII-4-2024 (October 21, 2024): 619–25. http://dx.doi.org/10.5194/isprs-archives-xlviii-4-2024-619-2024.
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Abstract. As commercial 5G systems rapidly expand, indoor positioning using 5G signals holds great potential for serving a large number of users. In this paper, an effective fingerprint solution is proposed for indoor positioning with 5G signal base station by exploring the multi-beam property. Multi-beam channel state information (CSI) and multi-beam reference signal received power (RSRP) are used as the observations for fingerprinting. To assess the effectiveness of the proposed scheme, field tests were conducted across various indoor environments. The results showed that the positioning accuracy is improved by more than 45% compared with the single beam by using the multi-beam characteristics of the 5G signal. Based on the multi-beam RSRP, the proposed scheme can achieve a positioning error of 67% below 1 meter. In the awareness of the two typical indoor deployments of 5G systems, i.e., the digital indoor distribution (DID) and the distributed antenna system (DAS), the paper also compared the 5G positioning performance in these two scenarios. The field tests showed that, the multi-beam in DID has more features than in DAS, which lead to a better positioning performance than that in DAS.
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Oh, Eunsung, and Sung-Yong Son. "Appropriate Technology-Based AMI Deployment in Multi-Dwelling Units." Energies 15, no. 4 (2022): 1259. http://dx.doi.org/10.3390/en15041259.
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Digital technologies, especially information and communication technologies, paved the way for social welfare by providing efficient and effective means for services. In the energy sector, advanced metering infrastructures (AMIs) are essential for providing various services through information measurement. In this article, we focus on the deployment of an AMI in multi-dwelling units where automated meter reading (AMR) infrastructures are installed. In particular, we explore whether the AMR should substitute the AMI with few alterations, while ensuring desirable accuracy. To determine the adequacy of technology, information measurement performance, service performance, and implementation cost are used as the indicators. Through a case study using real data recorded in Korea, we quantitatively estimate that AMR-based information measurement can exhibit adequate performance and performance degradation of less than 1% in a service environment utilizing AMI with a low-cost investment. We also discuss several technologies and implementation issues in the upcycling of AMR for more reliable service. This study provides a guide for when configuring an information measurement system for a new energy service.
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Ma, Zheng, Ming Liu Liu, A. Hui Yang, and You Yang Liu. "Integrated Instrument Based on SOPC." Applied Mechanics and Materials 214 (November 2012): 141–47. http://dx.doi.org/10.4028/www.scientific.net/amm.214.141.
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This instrument based on SOPC technology is embedded with a NIOS soft-core in Cyclone III as a control center that integrates digital oscilloscope, DDS signal generator and a simple digital multi-meter. It can measure AC signal of 200 Hz-5MHz and 10mVpp-10Vpp, display and store the wave, and can also manually and automatically adjust the amplitude and frequency. This instrument can generate sine wave of 10Hz to 1.5MHz, square wave of 10Hz to 200 KHz, triangle wave, and saw-tooth wave vary from 150mVpp to 10Vpp. Also, it can measure AC and DC voltage of 20mV to 200V, the AC and DC current of 2mA to 1A, resistance of 20Ω to 2MΩ, maintaining 5% accuracy. It is simple, easy to use, can fulfill the general experiment requirements with good performance and strong practicability.
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Li, Nuo, Guo Ding Liang, Li Yang, Yun Peng Ji, and Song Yang Li. "An Automatic Calibration System for Multimeter Based on Fluke MET/CAL." Applied Mechanics and Materials 644-650 (September 2014): 1303–6. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.1303.
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The calibration process of a digital Multi-meter (DMM) is complicated and tedious. The whole procedure needs to calibrate dozens of test points of several measuring ranges. Usually, the automatic calibration system is used to replace the manual operation. In metrology, the MAT/CAL which is a software produced by Fluke company has been widely used, but it can’t meet our special needs. This article is mainly on the introduction of design method of an automatic calibration system for DMM basing on Fluke MAT/CAL. It describes the setup of hardware, the improvement of ACC file in MAT/CAL and the basic principle of our software.
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Weigel, Paul, Manfred Fischedick, and Peter Viebahn. "Holistic Evaluation of Digital Applications in the Energy Sector—Evaluation Framework Development and Application to the Use Case Smart Meter Roll-Out." Sustainability 13, no. 12 (2021): 6834. http://dx.doi.org/10.3390/su13126834.
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The development of digital technologies is accelerating, enabling increasingly profound changes in increasingly short time periods. The changes affect almost all areas of the economy as well as society. The energy sector has already seen some effects of digitalization, but more drastic changes are expected in the next decades. Besides the very positive impacts on costs, system stability, and environmental effects, potential obstacles and risks need to be addressed to ensure that advantages can be exploited while adverse effects are avoided. A good understanding of available and future digital applications from different stakeholders’ perspectives is necessary. This study proposes a framework for the holistic evaluation of digital applications in the energy sector. The framework consists of a combination of well-established methods, namely the multi-criteria analysis (MCA), the life cycle assessment (LCA), and expert interviews. The objective is to create transparency on benefits, obstacles, and risks as a basis for societal and political discussions and to supply the necessary information for the sustainable development and implementation of digital applications. The novelty of the proposed framework is the specific combination of the three methods and its setup to enable sound applicability to the wide variety of digital applications in the energy sector. The framework is tested subsequently on the example of the German smart meter roll-out. The results reveal that, on the one hand, the smart meter roll-out clearly offers the potential to increase the system stability and decrease the carbon emission intensity of the energy system. Therefore, the overall evaluation from an environmental perspective is positive. However, on the other hand, close attention needs to be paid to the required implementation and operational effort, the IT (information technology) and data security, the added value for the user, the social acceptance, and the realization of energy savings. Therefore, the energy utility perspective in particular results in an overall negative evaluation. Several areas with a need for action are identified. Overall, the proposed framework proves to be suitable for the holistic evaluation of this digital application.
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Fedorenko, Vyacheslav F., Vitaly E. Tarkivskiy, Nikolay P. Mishurov, and Nikolay V. Trubitsyn. "Digital Data Processing Methods for Estimating Tractive Force of Tractors." Engineering Technologies and Systems 31, no. 1 (2021): 127–42. http://dx.doi.org/10.15507/2658-4123.031.202101.127-142.
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Introduction. When carrying out an energy assessment of agricultural machines and traction tests of tractors, the most important indicator is the value of the tractive effort. The existing methods for determining the tractive effort of tractors imply the use of specialized measuring instruments, such as strain gauges and devices for processing and displaying information. The accuracy of determining the tractive effort is significantly influenced by the physical and mechanical properties of soil. To process the useful signal during the measurement of tractive effort, the data stream of the strain gauge sensor must be subjected to additional digital filtering taking into account the operating conditions of the agricultural unit. Materials and Methods. The functions of changing the tractive effort obtained on the K-744R2 tractor in various gears have been analyzed. An algorithm for digital processing of the signal of a strain gauge force meter based on a median filter has been developed that makes it possible to increase the measurement accuracy. The advantage of the proposed method is the ability to cut off sharp short-term impulse noise and sharp fluctuations in the amplitude of the measured value. Results. A method for determining the amount of tractive effort using median signal processing has been proposed. A device for determining the tractive effort during testing of agricultural tractors and units has been developed. The choice of the main components of the device for determining the magnitude of the tractive effort has been substantiated. As a result of the research, a device for measuring and digital processing of the signal of a force meter based on a microcontroller and specialized software for processing initial data in real time was designed and manufactured. Discussion and Conclusion. The developed method makes it possible to exclude the negative effect of impulse noise arising in the process of measuring the tractive effort of the tractor. The proposed device for measuring the tractive effort of tractors is compatible at the level of the exchange protocol with existing devices, has a high speed of operation in real time, multi-channel operation.
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Olanda, Beto, and Dody Susilo. "Desain dan Rancang Instalasi Listrik Sederhana Skala Rumah Tangga." ELECTRA : Electrical Engineering Articles 1, no. 2 (2021): 7. http://dx.doi.org/10.25273/electra.v1i2.8959.
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Listrik adalah salah satu kebutuhan yang sangat penting bagi manusia dan sebagai sumber daya ekonomis yang paling utama bagi manusia. Dalam waktu yang akan datang kebutuhan listrik akan semakin meningkat sesuai dengan perkambangan teknologi, penggunaan listrik merupakan suatu hal yang penting dalam kehidupan baik itu dalam sektor rumah tangga, penerangan, komunikasi, industri dan lain sebagainya. Pada bidang kelistrikan, instalasi listrik merupakan suatu rangkaian dari perlatan listrik yang berhubungan antara satu dengan yang lainnya dalam satu lingkup tenaga listrik. Instalasi yang baik adalah instalasi yang aman bagi manusia, bahwa listrik juga dapat membahayakan dan berdampak negatif bagi manusia. Maka dari itu agar tidak terjadi hal yang dapat membahayakan manusia seorang teknisi listrik dapat memahami tentang instalasi listrik sesuai dengan peraturan dan teknis pemasangan yang sesuai dengan PUIL. Metode penelitian yang digunakan yaitu merancang instalasi listrik sederhana yang sesuai dengan PUIL. Dari hasil pengujian oleh alat ukur Avo meter digital didapatkan setelah rangakain di aliri listrik, dan di ukur oleh multi meter pada stop kontak Frekuensi 50,00 Hertz dan Tegangan 222,1 Volt.
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Alamaniotis and Gatsis. "Evolutionary Multi-Objective Cost and Privacy Driven Load Morphing in Smart Electricity Grid Partition." Energies 12, no. 13 (2019): 2470. http://dx.doi.org/10.3390/en12132470.
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Utilization of digital connectivity tools is the driving force behind the transformation of the power distribution system into a smart grid. This paper places itself in the smart grid domain where consumers exploit digital connectivity to form partitions within the grid. Every partition, which is independent but connected to the grid, has a set of goals associated with the consumption of electric energy. In this work, we consider that each partition aims at morphing the initial anticipated partition consumption in order to concurrently minimize the cost of consumption and ensure the privacy of its consumers. These goals are formulated as two objectives functions, i.e., a single objective for each goal, and subsequently determining a multi-objective problem. The solution to the problem is sought via an evolutionary algorithm, and more specifically, the non-dominated sorting genetic algorithm-II (NSGA-II). NSGA-II is able to locate an optimal solution by utilizing the Pareto optimality theory. The proposed load morphing methodology is tested on a set of real-world smart meter data put together to comprise partitions of various numbers of consumers. Results demonstrate the efficiency of the proposed morphing methodology as a mechanism to attain low cost and privacy for the overall grid partition.
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Levterov, Andrey. "Method of multiscale coincidence of pulses for measuring temporary loads from moving vehicles in bridges and overpasses." Bulletin of Kharkov National Automobile and Highway University, no. 94 (December 16, 2021): 160. http://dx.doi.org/10.30977/bul.2219-5548.2021.94.0.160.
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Modern development of road transport is characterized by constant updating of the nomenclature of cars (including heavy-duty vehicles), by increasing of intensity and speed of their movement, especially in large metropolises and on roads of national and local significance. This complicates the operating conditions of spans of highway bridges to some extent, leads to their damage and early wear. The deterioration of the technical condition of the structures of the spans is largely due to the increased dynamic impact of the cars on the bridges. The purpose of this article is to measure the amplitude of oscillations of a bridge structure from temporary loads of rolling stock with non-periodic long-term loading by optical methods. In accordance with this goal, it is necessary to develop a technique and device for measuring the amplitude of oscillations of the bridge structure by converting the amplitude of oscillations in time intervals and their subsequent measurement by multi-scale pulse coincidence. In a number of works, digital deployment systems that use number systems with different bases, represented by a family of deployment functions, are considered in detail.
 Such digital systems in general, are described by the corresponding operating scheme. According to this operating scheme, a method of multiscale matching for measuring time intervals was developed, which formed the basis for measuring the vibration amplitude of the bridge structure. The given mathematical model of calculation of the number of measurement channels was used in the synthesis of velocity transducers and linear displacements based on optical (laser) deployment systems, information conversion devices of radar velocity sensors based on the Doppler effect. Similarly, a frequency comparison device, a digital frequency meter, a digital phase meter, and a number of other frequency-time group devices were synthesized.
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Zhang, Qinghai, Xiaoqian Zhang, Qingjian Zhao, et al. "An Optimization Method for Design Solutions to Active Reflective Surface Control Systems Based on Axiomatic Design and Multi-Criteria Decision Making." Electronics 13, no. 23 (2024): 4655. http://dx.doi.org/10.3390/electronics13234655.
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The design of an Active Reflective Surface Control System (ARCS) is a complex engineering task involving multidimensional and multi-criteria constraints. This paper proposes a novel methodological approach for ARCS design and optimization by integrating Axiomatic Design (AD) and Multi-Criteria Decision Making (MCDM) techniques. Initially, a structured design plan is formulated within the axiomatic design framework. Subsequently, four MCDM methods—Technique for Order Preference by Similarity to Ideal Solution (TOPSIS), Entropy Weight Method (EWM), Multi-Criteria Optimization and Compromise Solution (VIKOR), and the integrated TOPSIS–Grey Relational Analysis (GRA) approach—are used to evaluate and compare the alternative solutions. Additionally, fuzzy information axioms are used to calculate the total information content for each alternative to identify the optimal design. A case study is conducted, selecting the optimal actuator for a 5 m diameter scaled model of the Five-hundred-meter Aperture Spherical radio Telescope (FAST), followed by digital control experiments on the chosen actuator. Based on the optimal design scheme, an ARCS prototype is constructed, which accelerates project completion and substantially reduces trial-and-error costs.
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Sharma, Pratibha, and Jayshree Rathore. "Sunlight Induced Photogalvanics for Conversion and Storage of Solar Energy: Coomassie Brilliant Blue-Isopropyl Alcohol-Sodium Lauryl Sulphate System." Oriental Journal Of Chemistry 39, no. 4 (2023): 1059–63. http://dx.doi.org/10.13005/ojc/390432.
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Research plan was proposed for systematic observation with scientific way in the solar cell field of photogalvanics. It was analysis of experimental work under the solar energy output. The study of photogalvanic was done for solar energy conversion and storage by using of dye as Coomassie Brilliant Blue CBB), reductant as Isopropyl alcohol (IA), and surfactant as Sodium Lauryl Sulphate (SLS). For this purpose, a specially designed H shaped photogalvanic system was used under investigation for innovative results. Different scientific instruments were used for methodology set up i.e., pH meter (digital), microammeter, and 200 Wt. W bulb (As light source), multi-meter, two electrodes (one was calomel and another was Pt), carbon pot 450 k, resistance key. Findings: The photogalvanic cells were studied using different parameters via photo potential, photocurrent, conversion efficiency, fill factor and cell performance. The above values are as follows: 533.0 mV, 201.0 uA, 0.8796 %, 0.3066 and 114.0 minutes. These cells were studied for the good results in solar energy field. Novelty: The observed results are very good over previously obtained results with respect to Coomassie brilliant blue, reductant as Isopropyl alcohol, and surfactant as sodium lauryl sulphate system.
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P.K., Olulope, and O.S.Adeoye. "INVESTIGATION AND ANALYSIS OF POWER QUALITY OF SINGLE PHASE, LOW VOLTAGE CONSUMERS IN ADO –EKITI METROPOLIS." International Journal of Research - Granthaalayah 6, no. 5 (2018): 177–89. https://doi.org/10.5281/zenodo.1269611.
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This paper examines the power quality of Ado-Ekiti metropolis in Ekiti State, Nigeria. The metrics of power quality includes: disturbances such as interruptions, voltage sags, spikes and momentary losses, power harmonics, and voltage unbalances with intrinsic effects on the efficiency and performances on the electric equipment. The necessity for this paper is the fluctuations of voltage supplied to the consumers by the distribution company in Ekiti State. These have significant effects on the power delivered to consumers ‘appliances, quality of their lives and the development of the society at large. The quality of voltage of each consumer in the selected areas were measured with the aid of digital multimeter which was compared with the standard nominal voltage of 240V, voltage deviations were evaluated through the use of standard mathematical equation and linear regression model was employed on the calculated voltage deviation with day and time used as inputs and the voltage deviation as the output. The implementation of the modelling was achieved through the use of Microsoft Excel data tool. The power quality for areas1, 2, 3 for the hours under consideration were poor with respect to R2 range of above 0.5 but better than that area 4 with R2 value of less than 0.5.The results were compared and recommendations were made with the view of improving the power quality in the metropolis.
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Kulkarni, Amey, and Amit Breed. "Generation of Electricity from Biological Source." International Journal of Research in Engineering, Science and Management 3, no. 10 (2020): 143–45. http://dx.doi.org/10.47607/ijresm.2020.356.
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Rapid consumption of renewable energy resources has led to development of an alternative source of energy. Fuel cell technology is a reliable and sustainable source of energy which was developed. Microbial fuel cell is a type which uses active micro-organisms as catalysts for production of electricity. The micro-organisms degrade the organic substrate to release protons and electrons which generate a potential difference across the cell. Our study focused on the generation of electricity from human urine using microbial fuel cell system. Specific bacteria were used as inoculum at anaerobic anode chamber and salt solution was supplied at aerobic cathode. The chambers were connected using salt bridge which would facilitate ion transfer. This made the system cost effective. The potential difference generated was measured using digital multi-meter.
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Stoner, Brant Edward, Griffin T. Jones, Sanjay Joshi, and Rich Martukanitz. "Optimization of digital radiography for large metallic additively manufactured components." Rapid Prototyping Journal 26, no. 3 (2019): 531–37. http://dx.doi.org/10.1108/rpj-04-2018-0107.
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Purpose The continued improvement of additive manufacturing (AM) processing has led to increased part complexity and scale. Processes such as electron beam directed energy deposition (DED) are able to produce metal AM parts several meters in scale. These structures pose a challenge for current inspection techniques because of their large size and thickness. Typically, X-ray computed tomography is used to inspect AM components, but low source energies and small inspection volumes restrict the size of components that can be inspected. This paper aims to develop digital radiography (DR) as a method for inspecting multi-meter-sized AM components and a tool that optimizes the DR inspection process. Design/methodology/approach This tool, SMART DR, provides optimal orientations and the probability of detection for flaw sizes of interest. This information enables design changes to be made prior to manufacturing that improve the inspectabitity of the component and areas of interest. Findings Validation of SMART DR was performed using a 40-mm-thick stainless-steel blade produced by laser-based DED. An optimal orientation was automatically determined to allow radiographic inspection of a thickness of 40 mm with a 70% probability of detecting 0.5 mm diameter flaws. Radiography of the blade using the optimal orientation defined by SMART DR resulted in 0.5-mm diameter pores being detected and indicated good agreement between SMART DR’s predictions and the physical results. Originality/value This paper addresses the need for non-destructive inspection techniques specifically developed for AM components.
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Berthier, E., C. Vincent, E. Magnússon, et al. "Glacier topography and elevation changes derived from Pléiades sub-meter stereo images." Cryosphere 8, no. 6 (2014): 2275–91. http://dx.doi.org/10.5194/tc-8-2275-2014.
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Abstract. In response to climate change, most glaciers are losing mass and hence contribute to sea-level rise. Repeated and accurate mapping of their surface topography is required to estimate their mass balance and to extrapolate/calibrate sparse field glaciological measurements. In this study we evaluate the potential of sub-meter stereo imagery from the recently launched Pléiades satellites to derive digital elevation models (DEMs) of glaciers and their elevation changes. Our five evaluation sites, where nearly simultaneous field measurements were collected, are located in Iceland, the European Alps, the central Andes, Nepal and Antarctica. For Iceland, the Pléiades DEM is also compared to a lidar DEM. The vertical biases of the Pléiades DEMs are less than 1 m if ground control points (GCPs) are used, but reach up to 7 m without GCPs. Even without GCPs, vertical biases can be reduced to a few decimetres by horizontal and vertical co-registration of the DEMs to reference altimetric data on ice-free terrain. Around these biases, the vertical precision of the Pléiades DEMs is ±1 m and even ±0.5 m on the flat glacier tongues (1σ confidence level). Similar precision levels are obtained in the accumulation areas of glaciers and in Antarctica. We also demonstrate the high potential of Pléiades DEMs for measuring seasonal, annual and multi-annual elevation changes with an accuracy of 1 m or better if cloud-free images are available. The negative region-wide mass balances of glaciers in the Mont-Blanc area (−1.04 ± 0.23 m a−1 water equivalent, w.e.) are revealed by differencing Satellite pour l'Observation de la Terre 5 (SPOT 5) and Pléiades DEMs acquired in August 2003 and 2012, confirming the accelerated glacial wastage in the European Alps.
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Bittner, Ksenia, Marco Körner, Friedrich Fraundorfer, and Peter Reinartz. "Multi-Task cGAN for Simultaneous Spaceborne DSM Refinement and Roof-Type Classification." Remote Sensing 11, no. 11 (2019): 1262. http://dx.doi.org/10.3390/rs11111262.
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Various deep learning applications benefit from multi-task learning with multiple regression and classification objectives by taking advantage of the similarities between individual tasks. This can result in improved learning efficiency and prediction accuracy for the task-specific models compared to separately trained models. In this paper, we make an observation of such influences for important remote sensing applications like elevation model generation and semantic segmentation tasks from the stereo half-meter resolution satellite digital surface models (DSMs). Mainly, we aim to generate good-quality DSMs with complete, as well as accurate level of detail (LoD)2-like building forms and to assign an object class label to each pixel in the DSMs. For the label assignment task, we select the roof type classification problem to distinguish between flat, non-flat, and background pixels. To realize those tasks, we train a conditional generative adversarial network (cGAN) with an objective function based on least squares residuals and an auxiliary term based on normal vectors for further roof surface refinement. Besides, we investigate recently published deep learning architectures for both tasks and develop the final end-to-end network, which combines different models, as using them first separately, they provide the best results for their individual tasks.
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Hu, Jian Guo, You Song Sun, and Zheng Rong Zhang. "Numerical Simulation and Experimental Validation of Three-Dimensional Unsteady Multi-Phase Flow in Flushing Process of Toilets." Applied Mechanics and Materials 444-445 (October 2013): 304–11. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.304.
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In order to predict the flush performances of digital toilet products before mass production, a numerical simulation for a three-dimensional unsteady multi-phase flow in the flushing process of a wash-down toilet is carried out by using FLUENT software. The finite volume method (FVM) is used to discrete the three governing equations in space and time. The discrete equations are solved by using the first-order upwind discretization scheme and the PISO pressure-velocity coupling scheme. The realizable turbulence model is chosen as the viscous model to treat the fluid flow with large bending curvature wall. The volume of fluid (VOF) model is applied to solve the transient free-surface problem. First, a two-phase flow was simulated on the assumption that there is not sewage but water in the trap seal. Then, by simplifying the mixture of sewage and water in the trap seal as the third phase with high viscosity, a three-phase flow was simulated. Moreover, in order to validate the simulated results, a flushing testing was conducted to test the flush range, and a target type flow meter was designed, calibrated and applied to test the flush velocity. The comparisons show a good agreement between the numerical and experimental results. Based on the verified simulation results, the flush performances of the digital wash-down toilet, such as flush range, flush velocity and sewage replacement ability, can be predicted and evaluated.
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Zhao, Shoubo. "In-situ measurement method for large-scale underwater equipment based on dehazing imaging technology." Journal of Physics: Conference Series 3023, no. 1 (2025): 012006. https://doi.org/10.1088/1742-6596/3023/1/012006.
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Abstract In-situ measurement for large-scale underwater equipment has been confronted with many challenges in measuring distance and accuracy. Existing methods can only detect small equipment with meter level dimensions. Inspired by indoor global positioning system (IGPS) measurement technology of large-scale equipment on land, we propose a underwater dehazing imaging three-dimensional measurement method based on digital micro-mirror device (DMD) sparse sensing to settle above issues. Specifically, polarization dehazing imaging involves modulating conjugated scattering field to eliminate background scattered light from water propagation. The multi frequency sonar locator builds underwater IGPS by obtaining the distances of spherical transmitters. The experiments demonstrate that the accuracy of combined measurement reaches 1mm with a measurement distance of 100 meters. This method is suitable for measuring the deformation of large underwater equipment such as dam gates, ships, and pipelines
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Li, Hongmin, Yuntong Dai, Hongxing Qiu, and Xiaoyuan He. "Application of multi-camera digital image correlation in the stability study of the long timber column with the circular cross-section under axial compression." BioResources 17, no. 1 (2022): 1717–28. http://dx.doi.org/10.15376/biores.17.1.1717-1728.
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Displacement meter synthesis (DMS), as a traditional method, is widely used to capture the local deformation of a specimen. However, for axis-symmetrical circular columns, the axial compression instability cannot be accurately evaluated using the DMS method due to the uncertain bending direction. To address this problem, a 360° full-surface digital image correlation (DIC) system composed of eight cameras is proposed to capture the full-field deformation information of the column surfaces under axial compression. The objective of this study was to experimentally validate the efficiency of the proposed novel measurement in tracking the full-filled compressive deformation of a long wooden column with the circular cross-section. The test results showed that the columns experience instable failure. The multi-camera DIC system can completely reconstruct the three-dimensional shape of the circular column and obtain the whole process deformation state at any position on the surface of the timber column. The DIC method also can capture the uncertain lateral deformation direction and obtain the data of lateral deflection at the mid-span of timber columns. The multi-camera DIC provides an intuitive and comprehensive new test method for the test and analysis of the stability of axisymmetric long timber columns.
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Ahmad, Waqas, Bushra Jabbar, Imtiaz Ahmad, et al. "Highly Sensitive Humidity Sensors Based on Polyethylene Oxide/CuO/Multi Walled Carbon Nanotubes Composite Nanofibers." Materials 14, no. 4 (2021): 1037. http://dx.doi.org/10.3390/ma14041037.
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Polymer composites are favorite materials for sensing applications due to their low cost and easy fabrication. In the current study, composite nanofibers consisting of polyethylene oxide (PEO), oxidized multi-walled carbon nanotubes (MWCNT) and copper oxide (CuO) nanoparticles with 1% and 3% of fillers (i.e., PEO–CuO–MWCNT: 1%, and PEO–CuO–MWCNT: 3%) were successfully developed through electrospinning for humidity sensing applications. The composite nanofibers were characterized by FTIR, XRD, SEM and EDX analysis. Firstly, they were loaded on an interdigitated electrode (IDE), and then the humidity sensing efficiency was investigated through a digital LCR meter (E4980) at different frequencies (100 Hz–1 MHz), as well as the percentage of relative humidity (RH). The results indicated that the composite nanofibers containing 1% and 3% MWCNT, combined with CuO in PEO polymer matrix, showed potent resistive and capacitive response along with high sensitivity to humidity at room temperature in an RH range of 30–90%. More specifically, the PEO–CuO–MWCNT: 1% nanocomposite displayed a resistive rapid response time within 3 s and a long recovery time of 22 s, while the PEO–CuO–MWCNT: 3% one exhibited 20 s and 11 s between the same RH range, respectively.
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Myers, D. J., C. M. Schweik, R. Wicks, F. Bowlick, and M. Carullo. "DEVELOPING A LAND COVER CLASSIFICATION OF SALT MARSHES USING UAS TIME-SERIES IMAGERY AND AN OPEN SOURCE WORKFLOW." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-4/W8 (July 11, 2018): 155–62. http://dx.doi.org/10.5194/isprs-archives-xlii-4-w8-155-2018.
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<p><strong>Abstract.</strong> Salt marsh ecology classification is difficult using traditional coarse resolution remote sensing techniques. Salt marshes exhibit a spatial pattern of vegetation zonation that are visually identifiable using imagery that has an improved 0.04 meter per pixel resolution. This project applies high resolution unmanned aerial system (UAS) imagery to aid in multi-temporal classification of our study area (Horseneck Beach) in Westport, Massachusetts, USA. We flew a DJI Phantom Pro 3 at low- and high-tide to capture effects the changing tide has on vegetation in an effort to predict effects of the rising sea level on saline plant species. We implement an open source software workflow using OpenDroneMap and the Semi-Automatic Classification Plugin for QGIS to create the necessary orthomosaics and to conduct vegetation classification required of this project. We compare land cover classifications using one-time-point RGB imagery to a multi-time-point (low tide, high tide) RGB image stack to investigate whether the multi-time point stack improves land cover classification accuracy. We find it does. More generally, this paper provides a model for others wishing to use low-cost UAS equipment carrying a simple low-cost RGB camera, and free and open source for geospatial (FOSS4G) tools, to develop multi-band image stacks to improve land cover classification accuracy. Further, we provide some reflections and technical notes on our experience. The approach we present here could be extended to include other image layers that UAS can provide when equipped with other sensors, such as multi-spectral (e.g., NIR, thermal), or by adding another band with photogrammetry-produced digital elevation data.</p>
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Thapa, Samita, and Janma Jaya Gairhe. "MAPPING SPATIAL DISTRIBUTION OF MAIN SEASON RICE FIELDS IN EASTERN NEPAL USING MULTI-TEMPORAL LANDSAT 8 IMAGES." Big Data In Agriculture 3, no. 1 (2020): 01–05. http://dx.doi.org/10.26480/bda.01.2021.01.05.
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Mapping rice area can be beneficial for change detection, irrigation management, climate change impact and vegetation protection and restoration programs. Remote sensing has provided a vantage means of mapping rice area. The unique physical characteristics of rice plants is that it is grown in flooded soil, which significantly affect the spectral reflectance from the rice fields. After a period of two months, the dense rice canopy cover replaces the flooded soil. This dynamic of the rice field is captured with the help of vegetation indices and are used to identify rice fields. Multi-spectral and multi-temporal data Landsat 8 data is used in the study. An algorithm that uses Normalized difference vegetation index (NDVI) and Land-surface Water Index (LSWI) derived from Landsat 16-days 30-meter data was used to differentiate paddy field from other areas. It works on the basis of sensitivity of LSWI for surface moisture and NDVI for vegetation content. This algorithm was used to detect rice fields in twelve local levels in Sunsari and Morang districts of Nepal. The results were validated using 0.44m resolution digital globe satellite imagery with 79 well-distributed control points. The overall accuracy of the method was found to be 79.746%.
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Hadiyanto, Gunawan. "P Pemanfaatan Arduino Uno sebagai Alat Ukur Offset Voltage pada Infra Red Detector type TO39 dengan pembanding alat ukur DMM." Elkom : Jurnal Elektronika dan Komputer 14, no. 1 (2021): 121–29. http://dx.doi.org/10.51903/elkom.v14i1.331.
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The infrared detector (or IR detector) is an optoelectronic component and represents the core element of gas analyzers, flame sensors, devices of spectral analysis, as well as non-contact temperature measurement. pyroelectric infrared detectors work with stabilization time in a wide operating temperature range (-55 ... 85) °C, capable of measuring the slightest amounts of infrared radiation (as little as a fraction of a nW) with wavelengths between 1 µm and > 25 µm. The difference of the good pyroelectric or No good (NG) devices shown by graph of voltage offset operating that can check by manual using Digital Multi Meter or semi auto by using microcontroller
 One of importance measuring of IRD sensors is Offset Voltage, stabilization of offset voltage indicate the sensor is stable with certain level value. Stabilization value measurement during measuring time means the average value not so much different with fluctuation value. 10 bit ADC on Atmega 328 that main microcontroller on Arduino Uno is capable to measure the Offset Voltage of IRD sensor and check the measurement values is within specification of IRD sensor.
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Zhang, Hongwei, Jiage Chen, Chenchen Wu, and Lijun Chen. "Technical Framework and Preliminary Practices of Global Geographic Information Resource Construction." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVIII-1-2024 (May 11, 2024): 837–42. http://dx.doi.org/10.5194/isprs-archives-xlviii-1-2024-837-2024.
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Abstract. High-precision and real-time global geographic information data are fundamental and strategic resources in various fields such as safeguarding global strategic interests, studying global environmental changes, and planning for sustainable development. However, due to challenges related to ground control and obtaining reference information, the development of global geographic information resources faces significant hurdles in terms of geometric positioning, information extraction, and data mining. This paper starts with the characteristics of domestically produced remote sensing images and proposes a comprehensive technical framework centered around "uncontrolled geometric positioning, intelligent interpretation of typical elements, mining of multi-source data from abroad, and intelligent hybrid collection and compilation of Digital Elevation Models (DEMs)." The paper elaborates on the key technical challenges that need to be overcome and their corresponding solutions. It also outlines the development of relevant data products and production technical specifications. Multiple production-oriented software tools were developed, leading to the creation of a variety of data products in multiple types and scales, including global 30-meter land cover data, DEM data, core vector data, and more.
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Xiong, Jianfei, Rong Zhou, Guocui Pu, Xiang Zhang, Zhonghai Wang, and Yuehu Pu. "Development of multichannel readout electronics system for MWPC of heavy ion radiotherapy." Journal of Instrumentation 19, no. 11 (2024): T11011. http://dx.doi.org/10.1088/1748-0221/19/11/t11011.
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Abstract A customized Multi-Wire Proportional Chamber (MWPC) was developed for beam monitoring in heavy ion radiotherapy at West China Hospital of Sichuan University. We designed a miniaturized readout electronics module to ensure the device is compact and lightweight enough to fit into the treatment head. Each module is equipped with 13 DDC316 chips and a Field Programmable Gate Array (FPGA) to process 200-channel signals from the MWPC, including charge integration, digital-to-analog conversion, beam spot localization, and an optical module to enable 100-meter signal transmission from the module to the Irradiation Control System (ICS). Test results show that the linearity of the readout data is better than 1% over the dynamic range of charge input from 60 fC–12 pC. The relative energy resolution of electronics is about 4.87% at a minimum input charge of 60 fC. The test results illustrate that the positional resolution is better than 0.1 mm after channel conformance correction with a MWPC, utilizing a 30 mm diameter X-ray beam at an energy of 19.5 keV.
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Luo, Yangao, Yunkai Deng, Wei Xiang, Heng Zhang, Congrui Yang, and Longxiang Wang. "Radargrammetric 3D Imaging through Composite Registration Method Using Multi-Aspect Synthetic Aperture Radar Imagery." Remote Sensing 16, no. 3 (2024): 523. http://dx.doi.org/10.3390/rs16030523.
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Interferometric synthetic aperture radar (InSAR) and tomographic SAR measurement techniques are commonly used for the three-dimensional (3D) reconstruction of complex areas, while the effectiveness of these methods relies on the interferometric coherence among SAR images with minimal angular disparities. Radargrammetry exploits stereo image matching to determine the spatial coordinates of corresponding points in two SAR images and acquire their 3D properties. The performance of the image matching process directly impacts the quality of the resulting digital surface model (DSM). However, the presence of speckle noise, along with dissimilar geometric and radiometric distortions, poses considerable challenges in achieving accurate stereo SAR image matching. To address these aforementioned challenges, this paper proposes a radargrammetric method based on the composite registration of multi-aspect SAR images. The proposed method combines coarse registration using scale invariant feature transform (SIFT) with precise registration using normalized cross-correlation (NCC) to achieve accurate registration between multi-aspect SAR images with large disparities. Furthermore, the multi-aspect 3D point clouds are merged using the proposed radargrammetric 3D imaging method, resulting in the 3D imaging of target scenes based on multi-aspect SAR images. For validation purposes, this paper presents a comprehensive 3D reconstruction of the Five-hundred-meter Aperture Spherical radio Telescope (FAST) using Ka-band airborne SAR images. It does not necessitate prior knowledge of the target and is applicable to the detailed 3D imaging of large-scale areas with complex structures. In comparison to other SAR 3D imaging techniques, it reduces the requirements for orbit control and radar system parameters. To sum up, the proposed 3D imaging method with composite registration guarantees imaging efficiency, while enhancing the imaging accuracy of crucial areas with limited data.
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Jibiri, Nnamdi Norbert, Deborah Selemon, and Idowu Richard Akomolafe. "Evaluation and implication of noise and vibration levels to the operators and proxy population around selected block molding industries in Ibadan, Nigeria." International Journal of Occupational Safety and Health 14, no. 3 (2024): 335–44. http://dx.doi.org/10.3126/ijosh.v14i3.52897.
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Introduction: Block-making industries owned by private individuals are cited in cities to utilize the existing market opportunity of supplying concrete blocks to developers. The study aimed to measure noise and vibration levels at selected block-molding industries and assess their health implications. Methods: The study design involves twenty-five block molding industries randomly selected in the Ibadan metropolis. These industries voluntarily agreed to participate in the research, and measurements were done between January and May 2022. The noise and vibration levels were measured using a digital multi-function environmental meter, Model DT-8820, and a vibration meter, Model VM-6360, respectively. Results: An overall mean noise level of 101.81 dB(A), 85.62 dB(A), 76.40 dB(A), 70.21 dB(A), 65.91 dB(A), and 63.61 dB(A) at 0, 10, 20, 30, 40 m, respectively, away from the source to residential buildings were obtained. Results indicate that the noise level at 0 m and 10 m exceeded the occupational noise level standard. The results obtained for the vibration levels on the hand of the operators ranged from 42.2 ms-2 to 59.7 ms-2 and these exceeded the occupational vibration level standard. This may indicate that the operators of the block-moulding machine may be exposed to various adverse health detriments due to high noise and vibration levels at their workplace. Conclusion: The study recommends using safety gadgets such as hearing protection and anti-vibration gloves for workers in these industries. Moreover, environmental education and awareness should be carried out, and residential structures should be situated at least 20 meters from the block industries.
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Loberternos, R. A., W. P. Porpetcho, J. C. A. Graciosa, et al. "AN OBJECT-BASED WORKFLOW DEVELOPED TO EXTRACT AQUACULTURE PONDS FROM AIRBORNE LIDAR DATA: A TEST CASE IN CENTRAL VISAYAS, PHILIPPINES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B8 (June 24, 2016): 1147–52. http://dx.doi.org/10.5194/isprs-archives-xli-b8-1147-2016.
Full textAbstract:
Traditional remote sensing approach for mapping aquaculture ponds typically involves the use of aerial photography and high resolution images. The current study demonstrates the use of object-based image processing and analyses of LiDAR-data-generated derivative images with 1-meter resolution, namely: CHM (canopy height model) layer, DSM (digital surface model) layer, DTM (digital terrain model) layer, Hillshade layer, Intensity layer, NumRet (number of returns) layer, and Slope layer. A Canny edge detection algorithm was also performed on the Hillshade layer in order to create a new image (Canny layer) with more defined edges. These derivative images were then used as input layers to perform a multi-resolution segmentation algorithm best fit to delineate the aquaculture ponds. In order to extract the aquaculture pond feature, three major classes were identified for classification, including land, vegetation and water. Classification was first performed by using assign class algorithm to classify Flat Surfaces to segments with mean Slope values of 10 or lower. Out of these Flat Surfaces, assign class algorithm was then performed to determine Water feature by using a threshold value of 63.5. The segments identified as Water were then merged together to form larger bodies of water which comprises the aquaculture ponds. The present study shows that LiDAR data coupled with object-based classification can be an effective approach for mapping coastal aquaculture ponds. The workflow currently presented can be used as a model to map other areas in the Philippines where aquaculture ponds exist.
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Loberternos, R. A., W. P. Porpetcho, J. C. A. Graciosa, et al. "AN OBJECT-BASED WORKFLOW DEVELOPED TO EXTRACT AQUACULTURE PONDS FROM AIRBORNE LIDAR DATA: A TEST CASE IN CENTRAL VISAYAS, PHILIPPINES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B8 (June 24, 2016): 1147–52. http://dx.doi.org/10.5194/isprsarchives-xli-b8-1147-2016.
Full textAbstract:
Traditional remote sensing approach for mapping aquaculture ponds typically involves the use of aerial photography and high resolution images. The current study demonstrates the use of object-based image processing and analyses of LiDAR-data-generated derivative images with 1-meter resolution, namely: CHM (canopy height model) layer, DSM (digital surface model) layer, DTM (digital terrain model) layer, Hillshade layer, Intensity layer, NumRet (number of returns) layer, and Slope layer. A Canny edge detection algorithm was also performed on the Hillshade layer in order to create a new image (Canny layer) with more defined edges. These derivative images were then used as input layers to perform a multi-resolution segmentation algorithm best fit to delineate the aquaculture ponds. In order to extract the aquaculture pond feature, three major classes were identified for classification, including land, vegetation and water. Classification was first performed by using assign class algorithm to classify Flat Surfaces to segments with mean Slope values of 10 or lower. Out of these Flat Surfaces, assign class algorithm was then performed to determine Water feature by using a threshold value of 63.5. The segments identified as Water were then merged together to form larger bodies of water which comprises the aquaculture ponds. The present study shows that LiDAR data coupled with object-based classification can be an effective approach for mapping coastal aquaculture ponds. The workflow currently presented can be used as a model to map other areas in the Philippines where aquaculture ponds exist.
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Astuti, Bernadetta Indri Dwi, Agung Laksono, Dzakwan Taufiq Nur Muhammad, et al. "Dinamika perubahan garis pantai Kabupaten Kendal tahun 2000-2020." Majalah Geografi Indonesia 35, no. 1 (2021): 75. http://dx.doi.org/10.22146/mgi.62301.
Full textAbstract:
Abstrak Pemantauan garis pantai akibat adanya proses akresi dan abrasi merupakan salah satu upaya untuk menjaga batas wilayah wilayah di Kabupaten Kendal. Lima multitemporal citra Landsat 7 ETM+ dalam periode tahun 20 tahun (2000-2020) digunakan untuk menganalisis perubahan garis pantai di Kabupaten Kendal.Tujuan dari penelitian ini adalah untuk menganalisis perubahan garis pantai dan menganalisis dampak serta upaya mitigasi dalam menangani perubahan garis pantai di Kabupaten Kendal. Digital Shoreline Analysis System (DSAS) digunakan untuk menganalisis perubahan garis pantai dengan metode Net Shoreline Movement (NSM), End Point Rate (EPR), dan Linear Regression Rate-of-Change (LRR). Hasil penelitian menunjukkan bahwa nilai tertinggi dari Linear Regression Rate-of-Change (LRR) selama periode 20 tahun adalah sebesar 50,9 m/tahun sedangkan nilai terendah sebesar -35,81 meter/tahun. Nilai rata-rata EPR dan NSM selama periode 20 tahun adalah sebesar -0,07 m/tahun dan -1,14 meter. Berdasarkan studi ini, dampak dari perubahan garis pantai yang disebabkan abrasi dan akresi adalah adanya peningkatan dan penurunan luas wilayah. Bentuk mitigasi perubahan garis pantai di Kabupaten Kendal yakni dengan pembangunan breakwater dan penanaman hutan mangrove. Abstract Monitoring shoreline change due to accretion and abrasion processes is one of the efforts to protect the maritime boundary of Kendal Regency. Five multi-temporal Landsat 7 ETM + images spanning 20 years (2000-2020) is used in the tudy for the analysis of shoreline change in Kendal Regency. This study aims to investigate the shoreline change, analyze the impact, and propose mitigation of shoreline change in Kendal Regency as well. Digital Shoreline Analysis System (DSAS) is utilized for the analysis of the shoreline change through Net Shoreline Movement (NSM), End Point Rate (EPR), and Linear Regression Rate-of-Change (LRR). The result shows that the highest value of the Linear Regression Rate (LRR) for 20 years is 50.09 m/year and the lowest value of LRR is -35.81 m/year. The average EPR and NSM are -0.07 m/years and -1.14 m. From this study, it can be observed that the impact of shoreline change induced by accretion and abrasion are the addition and subtraction of the predetermined area. The impacts can be mitigated by building breakwaters and planting mangroves.
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Mahdi, Luay, and Qais Al-Gayem. "Design, simulation and testing of an array of nano electro mechanical switches (NEMS)." Indonesian Journal of Electrical Engineering and Computer Science 22, no. 1 (2021): 113. http://dx.doi.org/10.11591/ijeecs.v22.i1.pp113-120.
Full textAbstract:
Electro mechanical switches used for multi-purposs applications with ultra small size in nano meter scale, operating in very small voltage in millivolts, approximately zero leakage current due to air gap separation between electrodes with three terminals that easy to control it. Nano electro mechanical switches are electronic switches similar to those used by conventional semiconductor switches in application as they can be used as relays, logic devices. The basic principle of nano electro mechanical switches is electronic switches operation is fundamentally different from semiconductor switches. They have many advantages over conventional semiconductor switches such as low-power digital logic applications, ability to work with very small voltage signals for low dynamic energy consumption, and durability against hostile environments such as high temperatures and radiation contaminated spaces. In this article, we will design, implement, and test a matrix of nano electro mechanical switches by on line test using the superposition theory. The simulations of these switches were implemented using the MATLAB-Simulink and ORCAD Pspice environments. Also, controlling the flow of current was achieved by means of a nanometer movement to make or break the physical contact between the electrodes.