Relevant bibliographies by topics / Acceleration meter

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  2. Dissertations / Theses
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  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Acceleration meter'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "Acceleration meter"

1

Arifin, Mochamad, Wahyu Andhyka Kusuma, and Syaifuddin Syaifuddin. "Monitoring Jarak Tempuh Lari Menggunakan Sensor Accelerometer." Jurnal Repositor 2, no. 6 (April 14, 2020): 795. http://dx.doi.org/10.22219/repositor.v2i6.781.

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Abstrak Berlari merupakan frekuensi langkah yang dipercepat sehingga pada waktu berlari terdapat kecenderungan badan melayang. Pada saat berlari kedua kaki tidak menyentuh sekurang – kurangnya satu kaki tetap menyentuh tanah. Seiring perkembangan teknologi yang semakin pesat dan maju, untuk mengukur suatu percepatan ketika berlari dapat menggunakan teknologi accelerometer. Accelerometer dapat digunakan sebagai alat bantu manusia yang memiliki beberapa kelebihan terutama untuk pengecekan percepatan dan jarak tempuh. Selain itu, accelerometer digunakan untuk mengukur percepatan, mendeteksi getaran, dan bisa juga untuk percepatan gravitasi. Pendeteksian gerakan berdasarkan pada 3 sumbu yaitu kanan-kiri, atas-bawah dan depan-belakang. Pada penelitian ini, besaran akselerasi pada sumbu x, y, dan z dari sensor accelerometer dengan menggunakan parameter jarak meliputi 5 meter, 10 meter , 15 meter dan 20 meter. Dari hasil pengujian yang diperoleh sebanyak 5 responden maka dapat diambil kesimpulan bahwa kecocokan data pengujian yang diambil secara manual dengan aplikasi memiliki perbedaan. Dari jarak pengujian 5 meter diperoleh hasil galat presentase error sebanyak 7,96%. Jarak 10 meter diperoleh sebanyak 6,4%. Jarak 15 meter diperoleh 13,68% meter. Selanjutnya, jarak 20 meter yaitu 11 %. Pengujian dilakukan dengan menggunakan aplikasi monitoring pada smartphone yang telah terinstall dan diletakkan pada saku celana responden sehingga akan diperoleh nilai data pada sumbu x,y dan z pada aplikasi yang kemudian di konversikan pada grafik gelombang sinus dan perhitungan manual berupa perhitungan jarak dan galat presentase error. Abstract Running is an accelerated frequency of steps so that when running there is a tendency for the body to float. When running both feet do not touch at least - one foot still touches the ground. Along with the development of technology that is increasingly rapid and advanced, to measure an acceleration when running can use the accelerometer technology. Accelerometer can be used as a human aid which has several advantages, especially for checking acceleration and mileage. In addition, the accelerometer is used to measure acceleration, detect vibrations, and can also be used for accelerating gravity. Motion detection is based on 3 axes namely right-left, top-bottom and front-back. In this study, the amount of acceleration on the x, y, and z axis of the accelerometer sensor using distance parameters includes 5 meters, 10 meters, 15 meters and 20 meters. From the test results obtained as many as 5 respondents, it can be concluded that the suitability of the test data taken manually with the application has a difference. A distance of 10 meters was obtained as much as 6.4%. A distance of 15 meters obtained 13.68% meters. Furthermore, the distance of 20 meters is 11%. The test is done by using a monitoring application on a smartphone that has been installed and placed in the pocket of the respondent's pants so that the data values on the x, y and z axes in the application are then converted to a sine wave graph and manual calculations in the form of distance and error percentage errors.
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Hogan, Mark J. "Electron and Positron Beam–Driven Plasma Acceleration." Reviews of Accelerator Science and Technology 09 (January 2016): 63–83. http://dx.doi.org/10.1142/s1793626816300036.

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Particle accelerators are the ultimate microscopes. They produce high energy beams of particles — or, in some cases, generate X-ray laser pulses — to probe the fundamental particles and forces that make up the universe and to explore the building blocks of life. But it takes huge accelerators, like the Large Hadron Collider or the two-mile-long SLAC linac, to generate beams with enough energy and resolving power. If we could achieve the same thing with accelerators just a few meters long, accelerators and particle colliders could be much smaller and cheaper. Since the first theoretical work in the early 1980s, an exciting series of experiments have aimed at accelerating electrons and positrons to high energies in a much shorter distance by having them “surf” on waves of hot, ionized gas like that found in fluorescent light tubes. Electron-beam-driven experiments have measured the integrated and dynamic aspects of plasma focusing, the bright flux of high energy betatron radiation photons, particle beam refraction at the plasma–neutral-gas interface, and the structure and amplitude of the accelerating wakefield. Gradients spanning kT/m to MT/m for focusing and 100[Formula: see text]MeV/m to 50[Formula: see text]GeV/m for acceleration have been excited in meter-long plasmas with densities of 10[Formula: see text]–10[Formula: see text][Formula: see text]cm[Formula: see text], respectively. Positron-beam-driven experiments have evidenced the more complex dynamic and integrated plasma focusing, 100[Formula: see text]MeV/m to 5[Formula: see text]GeV/m acceleration in linear and nonlinear plasma waves, and explored the dynamics of hollow channel plasma structures. Strongly beam-loaded plasma waves have accelerated beams of electrons and positrons with hundreds of pC of charge to over 5[Formula: see text]GeV in meter scale plasmas with high efficiency and narrow energy spread. These “plasma wakefield acceleration” experiments have been mounted by a diverse group of accelerator, laser and plasma researchers from national laboratories and universities around the world. This article reviews the basic principles of plasma wakefield acceleration with electron and positron beams, the current state of understanding, the push for first applications and the long range R&D roadmap toward a high energy collider.
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Lieberman, Paul, John Czajkowski, and John Rchard. "Optical System for Measurement of Pyrotechnic Test Accelerations." Journal of the IEST 35, no. 6 (November 1, 1992): 25–39. http://dx.doi.org/10.17764/jiet.2.35.6.jt5tv5811217p704.

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This effort was directed at comparing the response of several different accelerometcr and amplifier combinations to the pyrotechnic pulse simulating the ordnance separation of stages of multistage missiles. These pyrotechnic events can contain peak accelerations in excess of 100,000 G and a frequency content exceeding 100,000 Hz. The main thrust of this work was to compare the several accelerometer systems with each other and with a very accurate laser Doppler displacement meter in order to establish the frequency bands and acceleration amplitudes where the accelerometer systems are in error. The comparisons were made in simple sinc-wave and low-acceleration amplitude environments, as well as in very severe pyroshock environments. An optical laser Doppler displacement meter (LDDM) was used to obtain the displacement velocity and acceleration histories, as well as the corresponding shock spectrum.
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Yulmardani, Yulmardani. "Pengaruh Metode Latihan Acceleration Sprint terhadap Kemampuan Lari 60 Meter Siswa." JPGI (Jurnal Penelitian Guru Indonesia) 4, no. 1 (November 10, 2019): 50. http://dx.doi.org/10.29210/02364jpgi0005.

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<p><em>The problem in this study is the ability to run 60 meters Class V SDN 03 Pancung Tebal North Bayang District because 60 meters running are not in accordance with the time that should be achieved by junior-high-school students. Many factors cause the 60-meter running ability is not good, including the training method. For this reason, it is necessary to conduct a study with the aim to find out how much influence the acceleration sprint training method has on the ability to run 60 meters Class V SDN 03 Pancung Thick Bayang Utara District. This type of research is quasi-experimental. The study population was students of Class V SDN 03 Pancung Tebal District of North Bayang. Samples using purposive sampling technique, namely sampling based on the intentions that have been determined previously or with certain considerations, amounting to 15 people aged 11-13 years. Data was collected using a 60-meter student test with a 60-meter running ability test. The data analysis technique is the T-Test. The results of the data analysis show that: There is a significant influence on the acceleration sprint exercise of the ability to run 60 m Grade V students of SDN 03 Pancung Tebal, North Bayang District.</em></p>
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BYUN, JU-SUK, and DONG-HUN RYU. "HIGHLY ACCELERATED LIFETIME TEST METHOD STUDY FOR THE DIAPHRAGM GAS METER RELIABILITY ENHANCEMENT." International Journal of Air-Conditioning and Refrigeration 21, no. 03 (September 2013): 1350021. http://dx.doi.org/10.1142/s2010132513500211.

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The present study has been conducted to verify and enhance the MTBF of the diaphragm gas meter. The goals of this study were the development of acceleration test method for the diaphragm gas meter and the guarantee of B10 lifetime of 3000 h in normal operation condition. To develop the acceleration test method, the flow rate and the operation temperature were chosen as acceleration factors and experiments of 1000 h in four conditions are conducted. The results showed that the log-normal life distribution conforms to the diaphragm gas meter life distribution and the combination of the temperature and the flow rate can have the acceleration factor of up to 3.48. The uncertainty of the flow rate accuracy verification is 0.20% and the log-normal life distribution is used.
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Farias, Déborah De Araújo, Haroldo Gualter Santana, Valter Acetto Tenório, Olívia Nogueira Coelho, Jeffrey M. Willardson, and Humberto Miranda. "Effectiveness of a power-training block with two cluster set configurations in recreationally trained young adults on sprint performance." Revista Andaluza de Medicina del Deporte 13, no. 1 (October 8, 2019): 29–34. http://dx.doi.org/10.33155/j.ramd.2019.10.001.

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Objective: The purpose of the present study was to evaluate the effectiveness of a three-week power-training block with two different cluster set configurations using pneumatic equipment on sprint performance. Method: Thirty recreationally active subjects participated in this study (18 female and 12 male). The subjects were distributed randomly into Control (CG), Cluster 1 (CL1) and Cluster 2 (CL2) groups. The experimental procedure involved a three-week training period; at the pre- and post-training time points, a 20-meter sprint tests were applied. Results: There was an intergroup significant difference for the CL2 versus the CG for time, acceleration and velocity in the first 10-meter sprint test. The alpha value used was p < 0.05. For total time, total velocity, time and velocity in the first 10-meter sprint test: significant differences were observed for both CL1 and CL2 at the post-test. The total acceleration and acceleration in the first 10-meter sprint test was significantly different for the CL2 at the post-training. There were no significant differences in time, velocity and acceleration in the final 10-meter sprint test between groups. Conclusion: These results suggest that interventions with intra-set intervals (specifically CL2) using pneumatic equipment allow for positive adaptations in velocity and acceleration after three-week training.
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Susiloningtyas, Dewi, Della Ayu Lestari, and Supriatna Supriatna. "Pemodelan Spasial Peak Ground Acceleration dan Prediksi Luas Genangan Tsunami di Kota Bengkulu." Majalah Geografi Indonesia 34, no. 2 (September 28, 2020): 166. http://dx.doi.org/10.22146/mgi.44168.

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Abstrak Kota Bengkulu merupakan salah satu kota yang berada pada pesisir barat Pulau Sumatera yang mendapat pengaruh dari pertemuan Lempeng Indo-Australia dan Lempeng Eurasia serta Patahan Mentawai. Kondisi ini menyebabkan Kota Bengkulu rawan akan bencana gempa bumi dan tsunami. Tujuan penelitian ini adalah untuk mengetahui pola spasial kawasan rawan gempa bumi dan tsunami sebagai salah satu upaya mitigasi bencana. Kawasan rawan gempa bumi diamati dengan mencari Peak Ground Acceleration (PGA) gempa bumi di Kota Bengkulu pada tahun 2010 hingga 2018 sedangkan kawasan rawan tsunami diamati dengan mencari luas genangan tsunami dalam 3 skenario yaitu ketinggian gelombang 5 meter, 20 meter dan 25 meter dari garis pantai. Hasil penelitian menunjukkan bahwa wilayah terbangun eksiting yang memiliki resiko tertinggi berada bagian pesisir selatan Kota Bengkulu dengan wilayah PGA tinggi serta genangan tsunami yang luas dari tinggi gelombang tsunami 25 meter.Wilayah ini berada pada Kecamatan Kampung Melayu dengan prediski luas terdampak sebesar 653,69 Ha. Abstract Bengkulu City is one of the cities on the west coast of Sumatra Island which has been influenced by the Indo-Australian Plate and the Eurasian Plate as well as the Mentawai Fault. This condition makes Bengkulu City prone to earthquakes and tsunamis. The purpose of this study is to determine the spatial pattern of earthquake and tsunami prone areas as one of the disaster mitigation efforts. Earthquake-prone areas were observed by looking for the Peak Ground Acceleration (PGA) of earthquakes in Bengkulu City from 2010 to 2018 while tsunami-prone areas were observed by looking for the area of tsunami inundation in 3 scenarios, namely the wave height of 5 meters, 20 meters and 25 meters from the coastline . The results showed that the highly developed area with the highest risk was the southern coast of Bengkulu City with a high PGA area and a large tsunami inundation from a tsunami wave height of 25 meters. This area is located in the Kampung Melayu sub-district with a predisposition of an affected area of 653.69 hectares.
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Sapra, Neil V., Ki Youl Yang, Dries Vercruysse, Kenneth J. Leedle, Dylan S. Black, R. Joel England, Logan Su, et al. "On-chip integrated laser-driven particle accelerator." Science 367, no. 6473 (January 2, 2020): 79–83. http://dx.doi.org/10.1126/science.aay5734.

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Particle accelerators represent an indispensable tool in science and industry. However, the size and cost of conventional radio-frequency accelerators limit the utility and reach of this technology. Dielectric laser accelerators (DLAs) provide a compact and cost-effective solution to this problem by driving accelerator nanostructures with visible or near-infrared pulsed lasers, resulting in a 104 reduction of scale. Current implementations of DLAs rely on free-space lasers directly incident on the accelerating structures, limiting the scalability and integrability of this technology. We present an experimental demonstration of a waveguide-integrated DLA that was designed using a photonic inverse-design approach. By comparing the measured electron energy spectra with particle-tracking simulations, we infer a maximum energy gain of 0.915 kilo–electron volts over 30 micrometers, corresponding to an acceleration gradient of 30.5 mega–electron volts per meter. On-chip acceleration provides the possibility for a completely integrated mega–electron volt-scale DLA.
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Strasser, Ryan, Sylvester Badua, Ajay Sharda, Devin Mangus, and Lucas Haag. "Performance of Planter Electric-drive Seed Meter during Simulated Planting Scenarios." Applied Engineering in Agriculture 35, no. 6 (2019): 925–35. http://dx.doi.org/10.13031/aea.13763.

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Highlights. Seed meter rpm error decreased with increasing planter speed during steady states.Point-row operations could result in up to 10-13 seeds being over- or under-planted.Seed meter rpm error varied from -7.2% to 7.9% during curve planting transient states. Abstract. Electric drive seed metering systems have become a common method for singulating row crop seed. These singulation systems have substantially fewer moving parts and can potentially respond more quickly than other drive mechanisms. However, the accuracy and response time of these systems has yet to be examined to quantify potential benefits of adoption. The objectives of this study were (1) to quantify accuracy and response time of electric meter drives to varying ground speeds and speed transitions during in-lab simulation planting operations on straight-line and curves, and (2) to compare actual seed meter motor speed to target meter speed during simulation field scenarios. To quantify metering system performance, test scenarios were developed to simulate planting on headlands, within field boundaries including traversing in-field obstacles, and planting on curves with different radii. Ground speeds during simulation scenarios were 7.2, 12.9, and 16.1 kph when operating on straight rows and 6.0, 8, 11, and 14.5 kph when planting along curvilinear paths. Test scenarios also included planter acceleration and deceleration at 0.4 and 0.6 m/s2 when traversing in-field obstacles and tighter radii curves. Tests were conducted with two different seeding rates, 44,460 and 88,920 seeds/ha. Eight high frequency encoders were mounted on the electric meters of selected row units to record real-time meter rpm and quantify seed meter accuracy and response time. A custom DAQ system was developed to read simulation test scenario data files in ASCII text file format and send prescribed ground speed commands to the Horsch Maestro 24.30 planter’s ECU at 10 Hz using a program written in LabVIEW. Results indicated that seed metering accuracy increased as ground speed increased resulting in a significantly lower seed meter rpm error at 16.1 kph under steady-state conditions. During transient states, seed meters needed 3 to 4 s to respond during deceleration and acceleration resulting to seed meter rpm error ranging from -3.7% to 3.6% at 44,460 seeds/ha seeding rate and from -3.8% to 3.2% at 88,920 seeds/ha seeding rate. During point-row operations, the response time of the meters was 0.4 s which could result in up to 10 seeds being under-planted and up to 13 seeds being over-planted per row unit. During curvilinear planting, seed meter rpm error for steady states ranged from -0.5% to 0.8% across varying turn radii resulting to seeding rate error ranging from -223 to 370 seeds/ha while during transient states seed meter rpm error varied from -7.2% to 7.9% resulting to seeding rate error ranging from -5,886 to 7,187 seeds/ha. Keywords: Seed meter rpm, Seeding rate error, Simulation, Variable rate planting, Planter meter.
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Lasala, Melchor, Hiroshi Inoue, Roberto Tiglao, Zhengying Fan, Bartolome Bautista, and Ishmael Narag. "Establishment of Earthquake Intensity Meter Network in the Philippines." Journal of Disaster Research 10, no. 1 (February 1, 2015): 43–50. http://dx.doi.org/10.20965/jdr.2015.p0043.

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A network of realtime intensity meters is being established in different parts of the Philippines under a Japan-Philippines cooperation. The intensity meters can record and transmit on a near real-time basis the site-specific levels of groundshaking in terms of macroseismic intensity, peak ground acceleration and peak ground velocity. The intensity meters evaluate earthquake effects using the Philippine earthquake intensity scale – PHIVOLCS Earthquake Intensity Scale (PEIS). Deployment of the instruments was planned according to an optimum distribution with respect to active earthquake generators and vulnerable communities. All manned seismic stations of PHIVOLCS were equipped with an intensity meter while the rest was deployed in relevant disaster risk reduction and management centers. In its initial operation which started in 2012, the network captured several significant earthquakes such as theMw7.2 in Bohol in 2013.
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Dissertations / Theses on the topic "Acceleration meter"

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Kratochvíl, Petr. "Pevnostní analýza skříně alternátoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231727.

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In this diploma thesis is theoretically described and then practically performed stress analysis of alternator body, which in terms of traffic racing car often passes into disrepair. It is used reverse engineering method. The real part is converted to digital model and analysed using FEM calculation. Incoming data for FEM are obtained by experimental measurement on the car.
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Hain, Gerrit [Verfasser], Frank [Akademischer Betreuer] Mayer, Steffen [Akademischer Betreuer] Mueller, Frank [Gutachter] Meyer, Heiner [Gutachter] Baur, and Hendrik [Gutachter] Schmidt. "Onsets and dependencies of strenuous spine bending accelerations in drop landings / Gerrit Hain ; Gutachter: Frank Meyer, Heiner Baur, Hendrik Schmidt ; Frank Mayer, Steffen Mueller." Potsdam : Universität Potsdam, 2018. http://d-nb.info/1218404582/34.

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Hain, Gerrit [Verfasser], Frank [Akademischer Betreuer] Mayer, Steffen [Akademischer Betreuer] Müller, Frank Gutachter] Meyer, Heiner [Gutachter] [Baur, and Hendrik [Gutachter] Schmidt. "Onsets and dependencies of strenuous spine bending accelerations in drop landings / Gerrit Hain ; Gutachter: Frank Meyer, Heiner Baur, Hendrik Schmidt ; Frank Mayer, Steffen Mueller." Potsdam : Universität Potsdam, 2018. http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-427461.

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Lagemann, Benjamin. "Efficient seakeeping performance predictions with CFD." Thesis, KTH, Marina system, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-261772.

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With steadily increasing computational power, computational fluid dynamics (CFD) can be applied to unsteady problems such as seakeeping simulations. Therefore, a good balance between accuracy and computational speed is required. This thesis investigates the application of CFD to seakeeping performance predictions and aims to propose a best-practice procedure for efficient seakeeping simulations. The widely used KVLCC2 research vessel serves as a test case for this thesis and FINEŠ/Marine software package is used for CFD computations. In order to validate the simulations, results are compared to recent experimental data from SSPA as well as predictions with potential ˛ow code SHIPFLOW® Motions. As for the calm water simulations, both inviscid and viscous ˛ow computations are performed in combination with three mesh refinement levels. Seakeeping simulations with regular head waves of different wavelengths are set-up correspondingly. Furthermore, different strategies for time discretization are investigated. With the given computational resources, it is not feasible to complete seakeeping simulations with a ˝ne mesh. However, already the coarse meshes give good agreement to experiments and SHIPFLOW® Motions' predictions. Viscous ˛ow simulations turn out to be more robust than Euler ˛ow computations and thus should be preferred. Regarding the time discretization, a fixed time discretization of 150 steps per wave period has shown the best balance between accuracy and speed. Based on these findings, a best-practice procedure for seakeeping performance predictions in FINEŠ/Marine is established. Taking the most efficient settings obtained from head wave simulations, the vessel is subjected to oblique waves with 160° encounter angle. Under similar wave conditions, CFD predictions of a similar thesis show close agreement in terms of added wave resistance. Compared to the previous head wave conditions of this study, added resistance in 160° oblique waves is found to be significantly higher. This underlines that oblique bow quartering waves represent a relevant case for determining the maximum required power of a ship. CFD and potential ˛ow show similar accuracy with respect to ship motions and added wave resistance, albeit potential ˛ow outperforms CFD in terms of computational speed. Hence, CFD should be applied in cases where viscous effects are known to have large influence on a vessel's seakeeping behavior. This can be the case if motion control and damping devices are to be evaluated, for instance.
Tack vare den stadigt ökande beräkningskraften kan beräkningsuiddynamik (CFD) idag användas på beräkningsintensiva problem som sjöegenskapssimulationer. Den här rapporten undersöker användning av CFD på sjöegenskapsprestanda och syftar till att foreslå ett best-practice förfaringssätt för effektiv sjöegenskapssimulationer. Forskningsskrovet KVLCC2 fungerar som ett testfall för denna rapport och FINE—/Marine-mjukvarupaketet används för CFD-beräkningar. Viktiga parametrar, såsom ödestyp, beräkningsnät och tidssteg varierars systematiskt. Resultaten jämförs med experiment gjorda vid SSPA. Baserat på resultaten förelås en best-practice. Den föreslagna best-practice användas vidare för berökningar av sjöegenskaper i sneda vågor. Jämförelse av resultaten med liknande studier visar god överensstämmelse. Genom att använda det föreslagna förfarandet för best-practice kan CFD-sjöegenskapssimulationer användas på fall där viskösa krafter måste beaktas, till exempel rörelseregleringsanordningar.
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Vančura, Jakub. "Vliv vibračního tréninku na Power Plate na výkonnost člověka." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-311040.

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Title: The effect of vibration training on the Power Plate on human performance Objectives: Following the training schedule, the groups will be tested and results compared; as well as the study results revealed. Methods: In my diploma work I set out to test 16 individuals, who undergo an 8 week training program on the Power Plate vibration technology machine. Eight women and eight men will be separated into two groups. The first group (four men, and four women) will exercise on a vibrating machine, whereas the second group will exercise on the machine without any vibrational stimulus. Explosive agilities (Boscuv test - longest air-time). Reaction speed (auditory reaction to a beep signal, and reactometer test for both the upper and lower limbs. Flexibility (testing a sitting hamstring reach). Antropometric testing (Body mass, girth, active muscle weight, BMI). In order to be able to judge development, as well as to gauge kinesiologic abilities, I applied a number of special tests. The results of individual results are noted in the tables. The T-test was applied as a statistics method. Results: Through repeated measure, it was discovered that the group training on the Power Plate achieved improvements in three out of four tests. Two tests showed above average results against standard, especially in...
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Books on the topic "Acceleration meter"

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Singer, Robin. The high speed buffer board: A SAIL EIA-485 communications accelerator card for the vector measuring current meter. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1990.

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Book chapters on the topic "Acceleration meter"

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Chohan, Vinod C. "Simon van der Meer (1925–2011): A Modest Genius of Accelerator Science." In Reviews of Accelerator Science and Technology, 279–91. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814383998_0014.

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Greco, F., D. Carbone, F. Cannavò, A. A. Messina, and G. Siligato. "Absolute and Relative Gravity Measurements at Volcanoes: Current State and New Developments Under the NEWTON-g Project." In International Association of Geodesy Symposia. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/1345_2020_126.

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AbstractGravity changes associated with volcanic processes occur over a wide range of time scales, from minutes to years and with magnitudes between a few and a few hundred microGal. High-precision instruments are needed to detect such small signals and both time-lapse surveys along networks of stations, and continuous measurements at single points, are accomplished. Continuous volcano gravimetry is mostly carried out through relative gravimeters, either superconducting instruments, providing higher quality data, or the more widely used spring meters. On the other hand, time-lapse surveys can be carried out with relative (spring) gravimeters, that measure gravity differences between pairs of stations, or by absolute gravimeters, capable of measuring the absolute value of the gravitational acceleration at the observation point. Here we present the state-of-the-art of terrestrial gravity measurements to monitor and study active volcanoes and the possibilities of new gravimeters that are under development. In particular, we present data from a mini array of three iGrav superconducting gravimeters (SGs) at Mount Etna (the first network of SGs ever installed on an active volcano). A comparison between continuous gravity measurements recorded through the iGrav#016 superconducting gravimeter at Serra La Nave station (1730 m a.s.l.) and absolute gravity data collected with the Microg LaCoste FG5#238 gravimeter in the framework of repeated campaigns is also presented. Furthermore, we introduce the Horizon 2020 NEWTON-g project (New Tools for Terrain Gravimetry), funded under the FET-OPEN Research and Innovation Actions call, Work Programme 2016–2017 (Grant Agreement No 801221). In the framework of this project, we aim to develop a field-compatible gravity imager, including an array of low-costs Micro-Electro-Mechanical Systems (MEMS)-based relative gravimeters, anchored on an absolute quantum gravimeter. After the design and production phases, the gravity imager will be field-tested at Mt. Etna (Italy) during the last 2 years of the project.
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Taillant, Jorge Daniel. "Life Without Glaciers." In Glaciers. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199367252.003.0011.

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Climate change is accelerating glacier melt. In the same month that this book first went to the editors, scientists reported the irreversible collapse of a massive portion of the West Antarctic ice sheet at Thwaites Glacier. Thwaites Glacier had already been news years earlier when a massive piece of ice 50 km (31 mi) wide, nearly 150 km (93 mi) long, and 3 km (1.8 mi) thick—that’s more than thirty city blocks of ice stacked on top of each other—broke off into the ocean and became Thwaites iceberg. Imagine an ice cube about seventy-five times the size of Manhattan Island floating away into the ocean. With the new reported collapse, the entire West Antarctic ice sheet has now entered into a rapid and irreversible melting phase (Figure 6.1). Thwaites Glacier, as well as others in the Amundsen Bay sector, such as the Pine Island Glacier, form part of a massive ice sheet on Antarctica that is falling to pieces. This is an ice sheet larger than France, Spain, Germany, and Italy combined, and it contains nearly 30 million cubic kilometers of ice (that’s about seven million cubic miles; Gosnell, 2005, p. 109). As these colossal ice bodies fall into the warmer ocean, they will begin to melt away, eventually raising global sea levels by about 1.2 meters (4 ft) (Figure 6.2). The breakdown has come much more quickly than expected and has now entered into an irreversible “runaway process.” What should have taken thousands of years in the natural evolution of things will now be complete in just centuries or less. The Pine Island Glacier is a long, flowing ice stream in the northeastern part of Amundsen Bay, and it is the world’s greatest contributor of ice to the oceans through melting and calving processes. It is also another of the glaciers at risk of collapsing entirely into the ocean. Thwaites Glacier’s collapse is an indicator that the whole ice sheet may be in imminent danger.
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Taillant, Jorge Daniel. "The Human Right … to Glaciers?" In Glaciers. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199367252.003.0015.

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Yes. The right to glaciers! The very title of this presentation creates a sense of discomfort for some legal experts, much like the discussion about the “right to water” did several years ago. This discomfort is intentional. Hopefully, by the end of this chapter, you will agree that, at the very least, we do need to have a discussion on the role glaciers play in terms of human rights realization, one that may lead us to deepen this discussion on the human rights dimension of glaciers. Glaciers are melting: we know that. And climate change, including natural ecosystemic millenary cycles of climate change, is causing glacier melt. But so is anthropogenic climate change, which is accelerating natural melt at alarming rates. Glacier melt will lead to both flooding in greatly populated areas—particularly downstream from rivers born in the Himalayas—and to the disappearance of massive water reserves in our glaciers and polar ice¬caps, which will in turn cause sea levels to rise and flood many low-lying island states. Some entire populations in the South Pacific, such as islanders on Tuvalu, are in fact already looking for a new nation. They simply have to move or be submersed by the sea. Glacier melt is also an enormous risk to the stability of massive ice bodies in high mountain altitudes. As these bodies deform (as often occurs due to melt), they can collapse and come rushing down-mountain with ice blocks as large as skyscrapers, sometimes pounding into glacier lakes formed by natural dams (formed in turn by moraines left by receding glaciers). These impacts can cause tsunami waves many meters high, taking out anything in their path. In the not-so-distant past, glacier tsunamis have taken thousands of lives in the mountainous areas of Peru, in parts of the Himalayas, and in certain parts of Europe. We read and hear about such predicaments in the media daily and are pretty much desensitized to this issue, although we know very little about the specifics or technical aspects of glacier melt.
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Posner, Richard A. "Introduction." In Catastrophe. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780195178135.003.0003.

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You wouldn’t see the asteroid, even though it was several miles in diameter, because it would be hurtling toward you at 15 to 25 miles a second. At that speed, the column of air between the asteroid and the earth’s surface would be compressed with such force that the column’s temperature would soar to several times that of the sun, incinerating everything in its path. When the asteroid struck, it would penetrate deep into the ground and explode, creating an enormous crater and ejecting burning rocks and dense clouds of soot into the atmosphere, wrapping the globe in a mantle of fiery debris that would raise surface temperatures by as much as 100 degrees Fahrenheit and shut down photosynthesis for years. The shock waves from the collision would have precipitated earthquakes and volcanic eruptions, gargantuan tidal waves, and huge forest fires. A quarter of the earth’s human population might be dead within 24 hours of the strike, and the rest soon after. But there might no longer be an earth for an asteroid to strike. In a high-energy particle accelerator, physicists bent on re-creating conditions at the birth of the universe collide the nuclei of heavy atoms, containing large numbers of protons and neutrons, at speeds near that of light, shattering these particles into their constituent quarks. Because some of these quarks, called strange quarks, are hyperdense, here is what might happen: A shower of strange quarks clumps, forming a tiny bit of strange matter that has a negative electric charge. Because of its charge, the strange matter attracts the nuclei in the vicinity (nuclei have a positive charge), fusing with them to form a larger mass of strange matter that expands exponentially. Within a fraction of a second the earth is compressed to a hyperdense sphere 100 meters in diameter, explodes in the manner of a supernova, and vanishes. By then, however, the earth might have been made uninhabitable for human beings and most other creatures by abrupt climate changes.
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"than its original energy. The ejected electron (Compton electron) has enough kinetic energy to cause excitations and ionizations in the absorber atoms. It thus interacts with the absorber in the same way as the ejected secondary electrons produced by an electron accelerator beam (Fig. 12b). Because Compton electrons are produced when gamma or x-ray photons interact with a medium, and because the Compton electrons cause ionizations and excitations in the same way as secondary electrons produced by accelerator beam electrons, the radiation-induced chemical changes in the irradiated medium are largely the same, regardless of the type of radiation used. The purpose of dose meters is to measure the amount of radiation energy absorbed by the irradiated product. The instrument that gives a reading of absorbed dose directly is the calorimeter. It measures the total energy dissipated or the rate of energy dissipation in a material in terms of the thermal properties of the absorbing body. This instrument, therefore, is considered to be an absolute dose meter that can be used for calibrating other dose meters. The principle of radiation calorime­ try is implicit in the definition of the radiation dose unit 1 Gy (gray) = 1 J (joule)/ kg. Ideally the temperature elevation should be measured in the irradiated food product itself— but in practice this is usually not done because the thermal properties of foodstuffs vary widely. A substance with known, reproducible thermal properties is taken instead, which serves as a heat-sensing calorimetric body, included in an adiabatic system (adiabatic = without transmission of heat). Water, graphite, aluminum, or a water-equivalent plastic is usually chosen, and the thermal change is determined by small calibrated thermocouples or thermis­ tors embedded in the calorimetric body. The practice of using radiation calorimetry is not simple, and ways to use it in a routine fashion have been developed only recently (24,25). Because the process of temperature elevation should run under adiabatic or quasi-adiabatic conditions, the dose has to be applied in a very short time. Calorimetry is therefore mostly used for measuring electron accelerator beam doses. The absorbed dose in the calorimetric body can be converted to that of the material of interest (foodstuff) by taking into consideration the different density and the different energy absorp­ tion coefficients of the two materials. The temperature elevation depends on radiation dose and on the specific heat of the material irradiated. A dose of 10 kGy causes a temperature elevation as follows: 2.3K in water (specific heat 4.2 kJ/kg • K) 6.2K in dry protein (specific heat 1.6 kJ/kg • K) 7.1K in dry carbohydrate (specific heat 1.4 kJ/kg • K) 12.5 K in glass (specific heat 0.8 kJ/kg • K)." In Safety of Irradiated Foods, 49. CRC Press, 1995. http://dx.doi.org/10.1201/9781482273168-38.

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"coating layer itself, an d at the interface between the coating and the substrate, causes instant fracturing and separation of coating material from the surface. In general, if a coating or contaminant is CHEMICALLY bonded to a surface, dry ice particle blasting will NOT effectively remove the coating. If the bond is PHYSICAL o r MECHANICAL in nature, such as a coating of rubber residue which is "anchored" into the porous surface of an aluminum casting, then there is a good chance that dr y ice blasting will work. Contaminants which are etched, or stained into the surfaces of metals, ceramics, plastics, or other materials typically cannot be removed with dry ice blasting. If the surface of the substrate is extremely porous or rough, providing strong mechanical "anchoring" for the contaminant or coating, dr y ice blasting may not be able to remove all of the coating, or the rate of removal may be too slow to allow dry ice blasting to be cost effective. The classic example of a contaminant that does NOT respond to dry ice blast-ing is RUST. Rust is both chemically and strongly mechanically bonded to steel substrate. Advanced stages of rust must be "chiseled" away with abrasive sand blasting. Only the thin film of powderized "flash" rust on a fresh steel surface can be effectively removed with dry ice blasting. 4.2.1.1. Inductio n (venturi) and direct acceleration blast systems - the effect of the typ e of system on available kinetic energy In a two-hose induction (venturi) carbon dioxide blastin g system, the medium particles are moved from the hopper to the "gun" chamber by suction, where they drop to a very low velocity before being induced into the outflow of the nozzle by a large flow volume of compressed air. Some more advanced two-hose systems employ a small positive pressure to the pellet delivery hose. In any type of two-hose system, since the blast medium particles have only a short distance in which to gain momentum and accelerate to the nozzle exit (usually only 200 to 300 mm), the final particle average velocity is limited to between 60 and 120 meters per second. So, in general, two-hose systems, although not so costly, are limited in their ability to deliver contaminant removal kinetic energy to the surface to be cleaned. When more blasting energy is required, these systems must be "boosted" a t the expense of much more air volume required, and higher blast pressure is re-quired as well, with much more nozzle back thrust, and very much more blast noise generated at the nozzle exit plane. The other type of solid carbon dioxide medium blasting system is like the "pressurized pot" abrasive blasting system common in the sand blasting and Plas-ti c Media Blasting industries. These systems use a single delivery hose from the hopper to the "nozzle" applicator in which both the medium particles and the compressed air travel. These systems are more complex and a little more costly than the inductive two-hose systems, but the advantages gained greatly outweigh the extra initial expense. In a single-hose solid carbon dioxide particle blasting system, sometimes referred to as a "direct acceleration " system, the medium is introduced from the hopper into a single, pre-pressurized blast hose through a sealed airlock feeder. The particles begin their acceleration and velocity increase." In Surface Contamination and Cleaning, 162–63. CRC Press, 2003. http://dx.doi.org/10.1201/9789047403289-25.

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Conference papers on the topic "Acceleration meter"

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Asano, M., Y. Tanabe, K. Watanabe, H. Genno, K. Nemoto, H. Nose, and M. Isawa. "Development of an Exercise Meter using Triaxial Acceleration Data." In 2005 IEEE Engineering in Medicine and Biology 27th Annual Conference. IEEE, 2005. http://dx.doi.org/10.1109/iembs.2005.1617294.

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Hooker, Simon M., Aarón Alejo, Christopher Arran, Alexander von Boetticher, Nicolas Bourgeois, Laura Corner, Linus Feder, et al. "Meter-scale conditioned hydrodynamic optical-field-ionized plasma channels." In Laser Acceleration of Electrons, Protons, and Ions VI, edited by Stepan S. Bulanov, Carl B. Schroeder, and Jörg Schreiber. SPIE, 2021. http://dx.doi.org/10.1117/12.2592325.

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Linghu, Rongfeng, Fangming Ruan, and Yi Wang. "Calibration of Acceleration-meter in Correlation Study of Approach Speed with Intensity of ESD." In The 2006 4th Asia-Pacific Conference on Environmental Electromagnetics. IEEE, 2006. http://dx.doi.org/10.1109/ceem.2006.257918.

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Uchiyama, T., and K. Shinohara. "System identification of mechanomyograms detected with an acceleration sensor and a laser displacement meter." In 2011 33rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2011. http://dx.doi.org/10.1109/iembs.2011.6091802.

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Apriantono, Tommy, Indria Herman, Agung Dwi Juniarsyah, and Sri Indah Ihsani. "Characteristics of Speed and Acceleration in the 60-Meter Running Test Between Men’s Football and Futsal Players." In 4th International Conference on Sport Science, Health, and Physical Education (ICSSHPE 2019). Paris, France: Atlantis Press, 2020. http://dx.doi.org/10.2991/ahsr.k.200214.093.

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Zhang, Liang, Gang Xu, Yue Wang, Li Chen, and Shao Chong Zhou. "Study on the Interaction Between Safety-Related and Non Safety-Related Items in the Component Cooling Water System Room of the Qinshan Nuclear Power Plant in the Earthquake Condition." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16825.

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Abstract Safety-related items in nuclear power plants are now generally placed separately from the non-safety-related items, but it was not strictly required before. Therefore, it is very important to study whether the non-safety-related items will affect the safety-related items when they are dropped down in an earthquake situation, which determines the safety of a nuclear power plant and its future life extension applications. This research was based on the cooling water system room with the safety and non-safety related items installed together, as an example to study whether the non-safety-related items such as vent pipes and DN50 fire fighting pipes arranged above will damage the DN300 pipes and valves arranged below when earthquakes occur. For the experiments, the relative positions of objects in the room was reproduced by 1: 1. The pressure-holding performance of the pipe was used as a criterion for the damage. The research results of the experiments show that when the 10-meter-long DN50 pipe was dropped from the position of 8 meters height and the 8-meter-long vent dropped from position of 3.6 meters height, they do not affect the integrity of the DN300 valve and pipe below. After the experiment, pressure drop in two hours for the pipe is less than 0.1%. The main body of the valve does not fail neither. The numerical simulation study also shows that there is no failure phenomenon in the simulation as well. Compared with the test results, the impact acceleration and the vent deformation both have the same trend.
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Jenkins, D. M., P. D. Lysak, D. E. Capone, W. L. Brown, and V. Askari. "Ultrasonic Cross-Correlation Flow Measurement: Theory, Noise Contamination Mechanisms, and a Noise Mitigation Technique." In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89537.

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Based on past experience with ultrasonic cross-correlation flow meters in power plant environments, the presence of spatially correlated noise due to pressure waves, vibration, or sources other than transport of turbulent eddies will cause a bias in the time delays measured by the meter. Several techniques were developed to detect the existence of such correlated noise and correct for its effect at plant conditions. An analytical and experimental investigation was performed to further understand the basic physics of the noise mechanisms. The dominant error mechanisms investigated in this work were speed of sound perturbations due to pressure fluctuations and beam path length changes due to wall vibration. An analytical model was formulated which estimates the signal level of the flow meter based on the turbulent velocity field. From this model, an estimate of the system noise which would cause contamination could be determined. A test at a water tunnel facility was performed in order to evaluate the noise mechanisms. During this test, measurements were taken with and without controlled noise sources. Pressure and acceleration measurements were used to evaluate a coherent noise removal technique developed to mitigate the impact of noise in the ultrasonic cross-correlation flow measurement. The coherent noise removal technique was shown to be effective in removing noise during the water tunnel test.
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McNeill, Scot, Puneet Agarwal, Dan Kluk, Kenneth Bhalla, Tomokazu Saruhashi, Ikuo Sawada, Masanori Kyo, Eigo Miyazaki, and Yasuyuki Yamazaki. "Real-Time Riser Fatigue Monitoring Routine: Architecture, Data and Results." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11540.

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Recently, the Modal Decomposition and Reconstruction (MDR) algorithm was developed to accurately estimate fatigue damage in marine risers based on measured acceleration and angular rates at several locations. The greatest benefit for drilling risers can be derived by incorporating the method in an online, fully automated system. In this way, fatigue damage estimates are available to the crew on the rig in real-time for risk quantification and mitigation. To this end, the MDR routine was implemented for online assessment of fatigue damage along the entire riser from acceleration and angular rate measurements at typically 5–10 elevations. This paper discusses the architecture, highlights some measured data and provides results for modes, stress and fatigue damage rate for the Chikyu drilling vessel during two scientific drilling campaigns. These campaigns occurred at the Shimokita site (1180-meter water depth) and the Nankai trough site (1939-meter water depth). To the authors’ knowledge, real-time fatigue monitoring of the entire riser has not been accomplished previously. Robust incorporation of the MDR algorithm into an online computational environment is detailed, including incorporation of top tension and mud weight data from the rig, detection and removal of data errors, and streamlined flow of the data through the computational modules. Subsequently, it is shown by example how the measured accelerations and angular rates are used to determine excited modes, participating modes, stress distribution and fatigue damage along the entire Chikyu drilling riser in an online setting. The technology highlighted advances riser integrity management two steps forward by first using measured data at 5–10 locations and the MDR algorithm to reconstruct stress and fatigue damage along the entire riser, and secondly integrating this approach into a fully automated, real-time computational environment. As a result, drilling engineers are empowered with a tool that provides real-time data on the integrity of the drilling riser, enabling informed decisions to be made in adverse current or wave conditions. Measured data also serves as a benchmark for analytical model calibration activities, reducing conservatism in stress and fatigue in future deployments. Furthermore, cumulative fatigue damage can be tracked in each riser joint, enabling more effective joint rotation and inspection programs.
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Srivilairit, T., and L. Manuel. "Vortex-Induced Vibration and Coincident Current Velocity Profiles for a Deepwater Drilling Riser." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29596.

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The objective of this study is to use full-scale field data on current velocities and riser motions to better understand the behavior of deepwater drilling risers. The data are comprised of riser accelerations and coincident current velocity profiles from the monitoring of vortex-induced vibration (VIV) of a drilling riser located at a 1,000-meter water depth site. Proper Orthogonal Decomposition (POD), an efficient numerical technique for characterizing the spatial coherence in a random field, is employed here to identify energetic current profiles. The accuracy resulting from the use of only a limited number of the most important POD modes is studied by comparing measured current velocity profiles with those reconstructed based on a reduced-order truncation. In addition to studying current velocity profiles, riser acceleration data from this deepwater drilling riser are also analyzed. In order to analyze the VIV response of this riser, in-line and cross-flow motions in different data segments are studied. Again, empirical POD procedures are employed—this time to derive energetic spatial vibration modes defining the riser motion. The relationship between riser response and coincident current velocity profiles is investigated, especially for those data segments associated with observed lock-in response.
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Hinzmann, Nils, Patrick Lehn, and Jörg Gattermann. "Large-Scale Model Investigation for Monopile Decommissioning of Offshore Wind Turbines: Overpressure and Vibratory Pile." In ASME 2021 3rd International Offshore Wind Technical Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/iowtc2021-3539.

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Abstract As of now, only a small number of offshore foundations, related to offshore wind energy, were decommissioned in Europe. With a diameter up to nine meter, an embedment of about 40 meter and a set up effect over 25 years, the necessary force to pull the pile out of the seabed can be assumed, if at all determinable, to be enormous. The piles that were decommissioned were cut beneath the mud line, which leaves approximately one third of the foundation permanently in the seabed. Different methods and techniques for a complete removal of offshore pile foundation are currently investigated within the project DeCoMP. Vibratory extraction aims for a reduction of the pile skin friction by creating a layer of less density between the pile shaft and pending soil. During the design and planning process for vibratory installation or extraction a drivability prediction is a key element. In order to identify and characterize soil parameter for the numerical simulation of a drivability prediction, large-scale tests are performed by the Institute of Geomechanics and Geotechnics of the Technische Universität Braunschweig (IGG-TUBS) [1]. In this paper first results of pilot tests with two vibrators are presented and key elements such as crane uplift, frequency and acceleration displayed.
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Reports on the topic "Acceleration meter"

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Hogan, Mark J. E-157: A 1.4 Meter-long Plasma Wakefield Acceleration Experiment Using a 30GeV Electron Beam from the Stanford Linear Accelerator Center Linac. Office of Scientific and Technical Information (OSTI), April 2000. http://dx.doi.org/10.2172/763745.

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Muggli, P. A Meter-Scale Plasma Wakefield Accelerator Driven by a Matched Electron Beam. Office of Scientific and Technical Information (OSTI), September 2004. http://dx.doi.org/10.2172/833075.

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