Journal articles: 'Handheld printer'

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Xu, Yang, and Jing Mei Cheng. "Research and Design of Handheld Thermal Transfer Label Printer Based on STM32." Applied Mechanics and Materials 602-605 (August 2014): 2930–33. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.2930.

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Handheld label printer has been widely used in various aspects of production and people’s life. By analyzing system structure and indexes of the printer, the author put forwards corresponding solutions. Firstly, hardware structure of the printer is introduced and functions of each part are briefly described. The software, which is mainly introduced, is composed of four parts: principle computer data transmission, character data processing, ribbon, position switch and label detections, and realization of print out task. With several debugging, label printing of high quality is achieved.

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He, Zhao, Fengkai Luan, and Mange Huang. "Image Acquisition Based on Handheld Portable Printer - Image Tilt Correction." Journal of Physics: Conference Series 1549 (June 2020): 022060. http://dx.doi.org/10.1088/1742-6596/1549/2/022060.

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Hakimi, Navid, Richard Cheng, Lian Leng, et al. "Handheld skin printer: in situ formation of planar biomaterials and tissues." Lab on a Chip 18, no. 10 (2018): 1440–51. http://dx.doi.org/10.1039/c7lc01236e.

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Zhu, K., C. Li, and B. Pan. "Rapid and Repeatable Fluorescent Speckle Pattern Fabrication Using a Handheld Inkjet Printer." Experimental Mechanics 62, no. 4 (2022): 627–37. http://dx.doi.org/10.1007/s11340-021-00814-6.

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Harshit, G. Bagewadi, GA Abhinav, KP Abhijith, Ulla Asfan, and Verma Payal. "Smart Bus Ticket Vending Machine." Journal of Computer Science Engineering and Software Testing 5, no. 3 (2019): 21–25. https://doi.org/10.5281/zenodo.3374357.

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It is indeed a fact that everyone does regularly travel in the city buses. But these days, the online cab booking has struck the government city buses profit very badly. People usually prefer cabs instead of city buses, as people feel more comfortable in cabs than buses. Changing the city bus system according to the following idea would bring a huge difference in number of passengers travelling in buses. The ticket machines which are now being used need to be upgraded, such that it will have GPS module and internet connectivity (for cloud connection).

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Chen, Bo, Ningning Yang, Qiang Jiang, Wenshuai Chen, and Ya Yang. "Transparent triboelectric nanogenerator-induced high voltage pulsed electric field for a self-powered handheld printer." Nano Energy 44 (February 2018): 468–75. http://dx.doi.org/10.1016/j.nanoen.2017.12.026.

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Chehri, Behnad, Kaiwen Liu, Golnaz Vaseghi, Amir Seyfoori, and Mohsen Akbari. "In Vitro Glioblastoma Model on a Plate for Localized Drug Release Study from a 3D-Printed Drug-Eluted Hydrogel Mesh." Cells 13, no. 4 (2024): 363. http://dx.doi.org/10.3390/cells13040363.

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Glioblastoma multiforme (GBM) is an aggressive type of brain tumor that has limited treatment options. Current standard therapies, including surgery followed by radiotherapy and chemotherapy, are not very effective due to the rapid progression and recurrence of the tumor. Therefore, there is an urgent need for more effective treatments, such as combination therapy and localized drug delivery systems that can reduce systemic side effects. Recently, a handheld printer was developed that can deliver drugs directly to the tumor site. In this study, the feasibility of using this technology for localized co-delivery of temozolomide (TMZ) and deferiprone (DFP) to treat glioblastoma is showcased. A flexible drug-loaded mesh (GlioMesh) loaded with poly (lactic-co-glycolic acid) (PLGA) microparticles is printed, which shows the sustained release of both drugs for up to a month. The effectiveness of the printed drug-eluting mesh in terms of tumor toxicity and invasion inhibition is evaluated using a 3D micro-physiological system on a plate and the formation of GBM tumoroids within the microenvironment. The proposed in vitro model can identify the effective combination doses of TMZ and DFP in a sustained drug delivery platform. Additionally, our approach shows promise in GB therapy by enabling localized delivery of multiple drugs, preventing off-target cytotoxic effects.

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Van, Cuong Nguyen, Anh Le Hoang, Cao Dang Long, and Duy Nguyen Hoang. "Surface Roughness in Metal Material Extrusion 3D Printing: The Influence of Printing Orientation and the Development of a Predictive Model." Engineering, Technology & Applied Science Research 13, no. 5 (2023): 11672–76. http://dx.doi.org/10.48084/etasr.6162.

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This study investigates the influence of printing orientation on the surface roughness in metal material extrusion 3D printing of 17-4 PH stainless steel. Experimental tests were conducted on the Markforged Metal X commercial 3D printer at Vinh Long University of Technology Education, Vietnam. The samples were printed in three different orientations: flat, on-edge, and upright. Surface roughness measurements were performed using a handheld Mitutoyo SJ-210 roughness tester. Quantitative analysis of the surface roughness measurements revealed significant variations among the different printing orientations. The upright orientation exhibited the smoothest surface, with an average Ra value of 7.42 μm and Rz value of 40.49 μm. In contrast, the flat orientation showed the highest roughness, with an average Ra value of 82.83 μm and Rz value of 109.32 μm. The on-edge orientation had intermediate roughness values, with an average Ra value of 69.42 μm and Rz value of 92.17 μm. The study also introduces a novel predictive model for surface roughness based on the printing parameters. The model demonstrated accurate estimations for surface roughness values in specific cases, enabling optimization of the printing process for desired surface quality.

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Kurahashi, Kosuke, Takashi Matsuda, Takaharu Goto, Yuichi Ishida, Teruaki Ito, and Tetsuo Ichikawa. "Duplication of complete dentures using general-purpose handheld optical scanner and 3-dimensional printer: Introduction and clinical considerations." Journal of Prosthodontic Research 61, no. 1 (2017): 81–86. http://dx.doi.org/10.1016/j.jpor.2016.06.002.

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Kamaraj, Meenakshi, Omid Rezayof, Alison Barer, et al. "Development of silk microfiber-reinforced bioink for muscle tissue engineering and in situ printing by a handheld 3D printer." Biomaterials Advances 166 (January 2025): 214057. http://dx.doi.org/10.1016/j.bioadv.2024.214057.

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Khorzad, Rebeca, Enid Montague, Anna P. Nannicelli, et al. "Redesigning Transplant Organ Labeling to Prevent Patient Harm and Organ Loss." Progress in Transplantation 28, no. 3 (2018): 271–77. http://dx.doi.org/10.1177/1526924818781574.

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Background: In 2012, the Health Resources and Services Administration and the United Network for Organ Sharing launched the “Electronic Tracking and Transportation” (ETT) project, in response to “labeling and packaging issues” being a frequently reported safety incident. This article describes an improvement project conducted as part of this United Network for Organ Sharing project. Methods: An interdisciplinary team conducted a Process Failure Modes and Effects Analysis, laboratory simulations of organ labeling during procurement, and a heuristic evaluation of a label software application to inform the design of TransNet, a system that uses barcode technology at the point of organ recovery. A total of 42 clinicians and staff from 10 organ procurement organizations and 2 transplant centers in the United States participated. Processes Addressed: Key features of the redesigned labeling system include independent, double entry of label information into the software application, a machine-readable barcode on each organ’s label, and a handheld printer for at “point of use” label printing. Outcomes: The new labeling system, TransNet, has become mandatory since June 2017. A survey conducted on early adopters (N = 11), after 1 year of use, indicates the process is safer and more efficient. Implications for Practice: The findings from this study suggest that the application of quality planning methods, common in other industries, when redesigning a health-care process, are valuable and revelatory and should be adopted more extensively. Future evaluation of TransNet effectiveness to reduce safety incidents is critical.

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Foster, T. P., J. P. Schweihofer, D. L. Grooms, R. H. Clarke, and D. D. Buskirk. "Comparison of beef traceability in serial and parallel fabrication systems using RFID and two-dimensional barcodes1." Translational Animal Science 2, no. 1 (2018): 101–10. http://dx.doi.org/10.1093/tas/txx007.

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Abstract Traceability of beef attributes from small- and mid-sized farms through supply chains is a market barrier. The objective of this trial was to determine the influence of fabrication method on beef traceability system requirements. Individual identities of 54 animals were maintained through harvest, processing, packaging, and distribution. At harvest, each animal’s unique radio frequency identification (RFID) animal identification number was transferred to a harvest label on each carcass quarter. Following transportation to a processor, nine carcasses were processed on alternating days by one of the two methods. Carcasses were fabricated, using a serial fabrication method (SFM), into wholesale cuts one at a time or fabricated using a parallel fabrication method (PFM), by processing multiple hindquarters or forequarters simultaneously into wholesale cuts. In-process labels were generated by scanning the two-dimensional (2D) barcode on the harvest label with a handheld mobile computer and printed from a wireless mobile printer. Tracking of SFM and PFM carcass quarters was accomplished by creating in-process labels for lugs and individual wholesale cuts, respectively. The process was recorded and the data was captured from video analysis. The mean number of in-process labels generated per carcass for SFM was 3.7 and for PFM was 30.9 (P &lt; 0.01). The amount of time required for generating in-process labels for SFM (2 min 16 s) was less than PFM (8 min 45 s) (P = 0.01). The amount of time required to label each carcass was less (P &lt; 0.01) for SFM (18 s) than for PFM (3 min 10 s) with in-process labels. Total cost of traceability, including fixed and consumable cost per carcass, was nearly twice as much for PFM ($17.98) than SFM ($9.02). Traceability, within both processing methods, was found to have 100% fidelity, as verified using DNA marker genotyping. Overall, the number of labels generated for traceability was less for SFM than that for PFM. The overall time spent on generating, applying, and removing labels was less for SFM than that for PFM. The total cost of traceability was approximately half for SFM compared with that for PFM; however both methods were able to track product accurately. Tracking of beef from individual animals, using RFID ear tags and 2D barcodes, appears to be feasible for the fabrication methods used in this study.

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Told, Roland, Gyula Marada, Szilard Rendeki, et al. "Manufacturing a First Upper Molar Dental Forceps Using Continuous Fiber Reinforcement (CFR) Additive Manufacturing Technology with Carbon-Reinforced Polyamide." Polymers 13, no. 16 (2021): 2647. http://dx.doi.org/10.3390/polym13162647.

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3D printing is an emerging and disruptive technology, supporting the field of medicine over the past decades. In the recent years, the use of additive manufacturing (AM) has had a strong impact on everyday dental applications. Despite remarkable previous results from interdisciplinary research teams, there is no evidence or recommendation about the proper fabrication of handheld medical devices using desktop 3D printers. The aim of this study was to critically examine and compare the mechanical behavior of materials printed with FFF (fused filament fabrication) and CFR (continuous fiber reinforcement) additive manufacturing technologies, and to create and evaluate a massive and practically usable right upper molar forceps. Flexural and torsion fatigue tests, as well as Shore D measurements, were performed. The tensile strength was also measured in the case of the composite material. The flexural tests revealed the measured force values to have a linear correlation with the bending between the 10 mm (17.06 N at 5000th cycle) and 30 mm (37.99 N at 5000th cycle) deflection range. The findings were supported by scanning electron microscopy (SEM) images. Based on the results of the mechanical and structural tests, a dental forceps was designed, 3D printed using CFR technology, and validated by five dentists using a Likert scale. In addition, the vertical force of extraction was measured using a unique molar tooth model, where the reference test was carried out using a standard metal right upper molar forceps. Surprisingly, the tests revealed there to be no significant differences between the standard (84.80 N ± 16.96 N) and 3D-printed devices (70.30 N ± 4.41 N) in terms of extraction force in the tested range. The results also highlighted that desktop CFR technology is potentially suitable for the production of handheld medical devices that have to withstand high forces and perform load-bearing functions.

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Cirelli, J., M. Goodstein, T. Bell, J. Liss, and P. Alur. "Audiovisual Presentations on a Handheld PC Are Preferred As an Educational Tool by NICU Parents." Applied Clinical Informatics 01, no. 02 (2010): 142–48. http://dx.doi.org/10.4338/aci-2010-01-ra-0005.

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Summary Background Health literacy is critical for understanding complex medical problems and necessary for the well being of the patient. Printed educational materials (PM) have limitations in explaining the dynamics of a disease process. Multimedia formats may be useful for enhancing the educational process. Objective: To evaluate whether a printed format or animation with commentary on a handheld personal computer (PC) is preferred as an educational tool by parents of a baby in the NICU. Methods: Parents evaluated two formats: A 1-page illustrated document from the American Heart Association explaining patent ductus arteriosus (PDA) and animation with commentary on a handheld PC that explained the physiology of PDA in 1 minute. The reading grade level of the PM was 8.6 versus 18.6 for the audio portion of the animated presentation. Parents viewed each format and completed a four-item questionnaire. Parents rated both formats and indicated their preference as printed, animation, or both. Results: Forty-six parents participated in the survey. Parents preferred animation over PM (50% vs. 17.4%. p = 0.02); 39.1% expressed that the animation was excellent; whereas 4.3% expressed that the PM was excellent (p<0.001). The order of presentation of formats, sex, age, and educational level of parents did not influence the method preferred (p>0.05). Conclusion: Parents preferred animation on a small screen handheld PC despite a much higher language level. Because handheld PCs are portable and inexpensive, they can be used effectively at the bedside with low-cost animation to enhance understanding of complex disease conditions. Citation: Alur P, Cirelli J, Goodstein M, Bell T, Liss J. Audiovisual Presentations on a Handheld PC Are Preferred As an Educational Tool by NICU Parents. Appl Clin Inf 2010; 1: 142-148 http://dx.doi.org/10.4338/ACI-2010-01-RA-0005

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Yıldırım, I. D., B. Sarioglu, and Y. D. Gokdel. "3D Printed Head for a Handheld Laser Scanning Confocal Microscope." Instruments and Experimental Techniques 64, no. 2 (2021): 301–7. http://dx.doi.org/10.1134/s0020441221010176.

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Lin, Shun-Yun, and Yu-Chih Lin. "Printed RFID reader antenna with circular polarization for handheld operation." Microwave and Optical Technology Letters 54, no. 12 (2012): 2728–30. http://dx.doi.org/10.1002/mop.27180.

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Singh, Ankur. "Bluetooth Wireless Technology & It's Applications." International Journal For Academic Research and Development 3, no. 2 (2021): 29–35. https://doi.org/10.5281/zenodo.6640697.

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This paper provides an overview of Bluetooth wireless technology and instructs users on an inexpensive, short-range radio technology that eliminates the need for proprietary cabling how to establish Bluetooth connections using IT products. Bluetooth wireless technology is between devices such as notebook PCs, handheld PCs, Personal Digital Assistants (PDAs), cameras, and printers.

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Lin, Ding-Bing, Jui-Hung Chou, Chih-Yu Wu, and Hsueh-Jyh Li. "A Novel Miniaturized Dual-Layered LTE Printed Antenna for Handheld Devices." IEEE Antennas and Wireless Propagation Letters 12 (2013): 1680–83. http://dx.doi.org/10.1109/lawp.2013.2297693.

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Xu, Yuancong, Qian Zhang, Yunyi Li, Xiaoxu Pang, and Nan Cheng. "A 3D-Printed Integrated Handheld Biosensor for the Detection of Vibrio parahaemolyticus." Foods 13, no. 11 (2024): 1775. http://dx.doi.org/10.3390/foods13111775.

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Vibrio parahaemolyticus (V. parahaemolyticus) is one of the important seafood-borne pathogens that cause a serious gastrointestinal disorder in humans. Recently, biosensors have attracted serious attention for precisely detecting and tracking risk factors in foods. However, a major consideration when fabricating biosensors is to match the low cost of portable devices to broaden its application. In this study, a 3D-printed integrated handheld biosensor (IHB) that combines RPA-CRISPR/Cas12a, a lateral flow strip (LFS), and a handheld device was developed for the ultrasensitive detection of V. parahaemolyticus. Using the preamplification of RPA on tlh gene of V. parahaemolyticus, a specific duplex DNA product was obtained to activate the trans-cleavage activity of CRISPR/Cas12a, which was then utilized to cleave the ssDNA probe. The ssDNA probe was then detected by the LFS, which was negatively correlated with the content of amplified RPA products of the tlh gene. The IHB showed high selectivity and excellent sensitivity for V. parahaemolyticus detection, and the limit of detection was 4.9 CFU/mL. The IHB also demonstrated great promise for the screening of V. parahaemolyticus in samples and had the potential to be applied to the rapid screening of other pathogen risks for seafood and marine environmental safety.

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Colella, Riccardo, Andrea Michel, and Luca Catarinucci. "Compact 3-D-Printed Circularly Polarized Antenna for Handheld UHF RFID Readers." IEEE Antennas and Wireless Propagation Letters 17, no. 11 (2018): 2021–25. http://dx.doi.org/10.1109/lawp.2018.2860253.

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Martínez-González, Antonio, Ma Angeles Sánchez-Aguilar, Marta Martínez-Vazquez, and David Sánchez-Hernández. "A comparison of dual-band spur-line printed antennas for handheld terminals." Microwave and Optical Technology Letters 30, no. 3 (2001): 205–7. http://dx.doi.org/10.1002/mop.1266.

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Li, Qian, and Yaxin Yu. "Miniaturized Coupling Structures for Decoupling PIFAs on Handheld Devices." International Journal of Antennas and Propagation 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/2854376.

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One efficient approach is introduced in this paper to reduce mutual coupling and correlation coefficient for two closely placed PIFAs in a handheld device. The approach is based on one miniaturized structure which consists of two metallic layers, printed on either side of one thin dielectric layer. Due to the small spacing between two conducting patches, high electromagnetic field is induced within the dielectric layer. The geometry and position of this structure have been modified to decouple the PIFA array at 1.9 GHz and produce maximum miniaturization thereby occupying less space on a handheld device ground plane. By employing the proposed structures, a 20 dB reduction in mutual coupling is achieved. The correlation coefficient also reduces to 0.007278. The performance of the structure is validated by both simulated results and measured data obtained from several fabricated prototypes.

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De Luca, D., M. Del Giudice, N. Grasso, F. Matrone, A. Osello, and M. Piras. "HANDHELD VOLUMETRIC SCANNER FOR 3D PRINTED INTEGRATIONS OF HISTORICAL ELEMENTS: COMPARISON AND RESULTS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W15 (August 22, 2019): 381–88. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w15-381-2019.

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Abstract. The latest technologies in the field of geomatics and additive manufacturing can provide a significant support to the restoration and conservation activities of Cultural Heritage (CH). In particular, the recent developments for both the 3D scanning techniques and the 3D printing systems are able to speed up the survey and the reconstruction of historical fragments gone lost. This research compares different meshes, obtained with different instruments and techniques, in particular a medium and a short-range volumetric handheld camera, with the aim of evaluating the best solution for the 3D printing and provide some guidelines for this kind of operation. Therefore, the focus is mainly on identifying the most effective solution to describe, represent and subsequently model small architectural details in the most automatic way, in order to step from the survey to the final printed result in the shortest time possible. Moreover, an attempt to integrate and complete not only sculptural details, by now well stated in the state of art, but also architectural elements, respecting the principles of reversibility and material recognisability typical of the modern restoration theories, has been done. The case study examined is an historical wooden gilded door with the lack of some decorative parts, in a church in the centre of Turin (Italy), symbol of the baroque architecture and damaged by a fire occurred during the Second World War.

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Yang, X., Y. Z. Yin, W. Hu, and G. Zhao. "Compact printed double-folded inverted-L antenna for long-range RFID handheld reader." Electronics Letters 46, no. 17 (2010): 1179. http://dx.doi.org/10.1049/el.2010.1031.

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See, C. H., R. A. Abd-Alhameed, N. J. McEwan, S. M. R. Jones, R. Asif, and P. S. Excell. "Design of a printed MIMO/diversity monopole antenna for future generation handheld devices." International Journal of RF and Microwave Computer-Aided Engineering 24, no. 3 (2013): 348–59. http://dx.doi.org/10.1002/mmce.20767.

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Chiu, Chien-Wen, Wei-Hsu Wang, and Hwang-Cheng Wang. "Quarter-wavelength printed quadrifilar helical antenna design for UHF RFID handheld reader applications." Microwave and Optical Technology Letters 60, no. 3 (2018): 742–48. http://dx.doi.org/10.1002/mop.31035.

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Ahmed, Waleed Abdelrahim, and Feng Quanyuan. "A Novel Compact CP Antenna with Wide Axial Ratio Bandwidth for Worldwide UHF RFID Handheld Reader." International Journal of Antennas and Propagation 2019 (May 2, 2019): 1–9. http://dx.doi.org/10.1155/2019/2497450.

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This study presents a novel compact circularly polarized antenna for universal ultrahigh-frequency (UHF) radio-frequency identification (RFID) handheld reader applications. The antenna is composed of a coplanar waveguide (CPW) L-shaped feedline mounted at the right edge of the square slot at the bottom of the ground plane to realize a circular polarization; a horizontal stub protruded from the right side of the square slot towards the slot centre, and a vertical stub is mounted at the lower left of the square slot. The designed antenna printed on one ground plane layer of a low-cost FR4 substrate with an overall size of 120×120×1.6 mm3. The measurement results show indicate that the fabricated antenna achieves a wide axial ratio (AR) bandwidth of 460 MHz (818–1278 MHz), wide impedance bandwidth of 54.6% (630–1103 MHz), and a measured peak gain of 4.0 dBi. The proposed antenna is a good candidate for compact universal UHF RFID handheld reader applications (840–960 MHz).

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Merkoçi, Arben, Luiz Humberto Marcolino-Junior, Sergio Marín, Orlando Fatibello-Filho, and Salvador Alegret. "Detection of cadmium sulphide nanoparticles by using screen-printed electrodes and a handheld device." Nanotechnology 18, no. 3 (2007): 035502. http://dx.doi.org/10.1088/0957-4484/18/3/035502.

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Lin, Ding-Bing, Jui-Hung Chou, Son-On Fu, and Hsueh-Jyh Li. "A Compact Dual-Band Printed Antenna Design for LTE Operation in Handheld Device Applications." International Journal of Antennas and Propagation 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/897328.

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A novel internal printed antenna suitable for triple long-term evolution (LTE) bands for handheld devices is presented. The operating bandwidths of the design are LTE700 (698~800 MHz), LTE2300 (2300~2400 MHz), and LTE2500 (2500~2690 MHz). Through the use of a C-shape broadside coupled feed structure, full operation in the lower band is achieved. The antenna itself uses two unequal path lengths to produce a low frequency band with two resonant modes. The required bandwidth is then adjusted using a couple feed, and finally placed over a ground plane via another C-type coupling element in order to enhance the two low-frequency matches. In the definition of the −6 dB reflection coefficient, the bandwidth of two basic modes in the low frequency band is 0.689~0.8 GHz. We adopt the definition of the −10 dB reflection coefficient for the high frequency mode, and its working frequency bands are shown to be 2.3~2.72 GHz. The antenna size is only 40 × 12 × 0.8 mm3with a ground plane of 98 × 40 mm2.

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Losch, Merle S., Benjamin E. Visser, Jenny Dankelman, and Benno H. W. Hendriks. "A handheld fiber-optic tissue sensing device for spine surgery." PLOS ONE 19, no. 12 (2024): e0314706. https://doi.org/10.1371/journal.pone.0314706.

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The demographic shift has increased the demand for surgical interventions to address age-related degenerative diseases, such as spinal fusion. Accurate placement of pedicle screws, crucial for successful spinal fusion, varies widely with physician experience. Integrating tissue sensing into spine surgical instruments allows intraoperative examination of tissue properties, providing surgeons with additional information to prevent screw misplacement. This paper introduces a handheld fiber-optic tissue sensing device for real-time bone tissue differentiation during spine surgery using Diffuse Reflectance Spectroscopy (DRS). Our prototype employs laser diodes at two distinct wavelengths for tissue illumination, eliminating the need for a spectrometer and enabling direct light collection with a photodiode. The device includes a printed circuit board (PCB) with driver circuits that are adjustable for varying laser diode output power, and signal amplification to convert the photodiode current to a measurable voltage signal. Controlled by a microcontroller, the device computes a reflectance ratio from both laser diode signals to provide real-time audio feedback to surgeons across various healthcare settings. Despite challenges in coupling efficiencies from manual fiber-coupling of the diodes, our prototype is able to emit and collect light to distinguish bone tissues with DRS, demonstrating feasibility. It is compact, made of low-cost and readily available components, and offers fast, real-time feedback, thus serving as a successful proof-of-concept for enhancing surgical accuracy during spinal fusion procedures.

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Mahvish and Tanika. "Printed Antenna Design and Simulation for 5G using HFSS." International Journal of Trend in Scientific Research and Development 3, no. 4 (2019): 961–65. https://doi.org/10.31142/ijtsrd24011.

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With expanding number of users, the demand for better technology also increases. The fifth Generation 5G technology would be one of the best technologies to meet the need of increased capacity demand, massive connectivity better speed by using the large amount of spectrum in the millimeter wave band, with 5G it is expected to get 80 100 Mbps speed. The need for 5G technology, methodology designing of antenna and various simulations is offered. The micro strip patch antenna is used here in 5G technology is relatively inexpensive to manufacture and design because of its simple physical geometry. Micro strip Patch Antenna shows multi band characteristics and has a compact structure and hence has emerged as a promising candidate for handheld devices the proposed idea is implemented by using HFSS software which is used for antenna designing Mahvish | Tanika "Printed Antenna Design and Simulation for 5G using HFSS" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-4 , June 2019, URL: https://www.ijtsrd.com/papers/ijtsrd24011.pdf

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Hua, Ren-Ching, and Tzyh-Ghuang Ma. "A Printed Dipole Antenna for Ultra High Frequency (UHF) Radio Frequency Identification (RFID) Handheld Reader." IEEE Transactions on Antennas and Propagation 55, no. 12 (2007): 3742–45. http://dx.doi.org/10.1109/tap.2007.910521.

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Wang, Zedong, and Ying-Zeng Yin. "SIMPLE PRINTED ANTENNA WITH PARASITIC ELEMENT FOR DVB-H, LTE/700 AND GSM HANDHELD TERMINALS." Progress In Electromagnetics Research C 42 (2013): 165–75. http://dx.doi.org/10.2528/pierc13062405.

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Wickström, Henrika, Anouk Broos, Johan O. Nyman, et al. "Handheld colorimeter as quality control tool for inkjet printed flexible levothyroxine doses for pediatric use." International Journal of Pharmaceutics 536, no. 2 (2018): 508–9. http://dx.doi.org/10.1016/j.ijpharm.2017.08.036.

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Lu, Liang, Yong-Chang Jiao, Li Zhang, Chao-Yi Cui, and Rui-Qi Wang. "Differential-fed printed monopole antenna loaded with half cylindrical DR for UWB handheld device application." Microwave and Optical Technology Letters 60, no. 3 (2018): 534–38. http://dx.doi.org/10.1002/mop.31009.

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Ormachea, O., A. Villazon, and O. Oporto. "Design and construction of a low-cost 3D-printed portable LIBS system." Journal of Physics: Conference Series 2238, no. 1 (2022): 012012. http://dx.doi.org/10.1088/1742-6596/2238/1/012012.

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Abstract Laser-Induced Breakdown Spectroscopy (LIBS) is a widely used non-destructive analysis technique, which is however costly. In this paper we present the development of a low-cost 3D-printed portable LIBS system designed and built with a Technology Readiness Level 5 (TRL 5), i.e., technology validated in a relevant environment. The proposed LIBS system is compact and includes a passive Q-switch Nd3+:YAG pulsed laser, a handheld measuring device, a power supply, an optical spectrometer and a processing software. The electronic control system guarantees a stable laser triggering, thanks to the use of optical connections (optocouplers) avoiding wired electrical connections of the circuits. In addition, we found the correct energy characteristics of the passive Q-switch regime, to generate a single laser pulse, thus making the system operate more efficiently. Our low-cost 3D-printed portable LIBS system was validated with several tests with real samples of atomic elements (i.e., lithium, copper, silver, gold and lead).

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LaRocco, John. "Optimization of a handheld line launcher for microgravity utility and rescue tasks." Journal of Search and Rescue 7, no. 2 (2024): 141–66. https://doi.org/10.61618/aofp5085.

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Line launchers are devices that have been used for centuries for maritime rescue operations. The typical implementation is the use of a gun, rocket, or mechanical launcher to hurl a grappling hook or flotation buoy for stranded ships and overboard sailors. Microgravity offers analogous use cases, ranging from microsatellite operations to space debris interception. As such, the Lachesis line launcher is a handheld device that is purpose-built for microgravity applications. After the user pulls the trigger, a laser ignites a smoothbore rocket-propelled projectile which carries a nylon line behind it. Angled threads in the barrel provide the spin and stability that is typically only achieved by conventional rifling. To reduce weight, most components are 3D-printed out of polylactic acid (PLA), a biodegradable and light plastic. With a total weight of 68 g and a projectile kinetic energy of 0.127 J, the Lachesis line launcher presents an effective, potential option, even with contemporary operational constraints. The design combines several proven principles to demonstrate the viability and use case for an updated line launcher in orbital operations. KEY WORDS: line launcher, microgravity, rescue device, object capture

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Chung, Soonwan, and Jae B. Kwak. "Comparative Study on Reliability and Advanced Numerical Analysis of BGA Subjected to Product-Level Drop Impact Test for Portable Electronics." Electronics 9, no. 9 (2020): 1515. http://dx.doi.org/10.3390/electronics9091515.

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In this paper, drop reliability of various PBA (printed board assembly) mounting structures is investigated and compared. Then, we built SAC305 (Sn3.0Ag0.5Cu) interconnects for BGA (ball grid array) package failure model to evaluate the drop impact reliability of handheld devices. In order to simulate actual behavior of the solder joint under the drop impact load of handheld devices, we perform explicit full FEA (finite element analysis) modeling. However, this takes a lot of computing time because of the large aspect ratio of element size between solder joints and other structures such as PCB (printed circuit board) and electronic packages. Therefore, an effective way to represent solder interconnects for FEA is needed which would be relatively simpler yet detailed. Comparable board-level drop tests are conducted after equipping test vehicles with various fixtures considering PBA mounting structures, which make it possible to apply different loading conditions to BGA packages. The results show different drop impact life for solder interconnects depending on the mounting design of the PBA. Particularly, the solder interconnect of the component located at the middle of the PCB exhibits the shortest impact life where the highest tensile stress occurs. Also, the mounting design restraining PBA deflections shows better reliability under the drop impact loading. Sequentially, simulating with a PBA composed of the BGA package and the PCB is considered to assess the feasibility of the solder ball failure modeling when the drop impact load is applied. Especially, for the modeling of the solder balls, detailed solid model and simple beam model are compared regarding computational efficiency and numerical accuracy. We found that the simple beam model significantly shortens computational time from 110 h to less than an hour. Accordingly, the feasibility of the beam model for the solder balls is shown by correlating the stress level and the drop impact life obtained from the experiments.

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Lajom, Maria Patrice, Joseph Paul Remigio, Edwin Arboleda, and Rhen John Rey Sacala. "Design and Development of Eggplant Fruit and Shoot Borer (Leucinodes Orbonalis) Detector Using Near-Infrared Spectroscopy." Journal of Engineering and Sustainable Development 28, no. 4 (2024): 439–54. http://dx.doi.org/10.31272/jeasd.28.4.3.

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An Eggplant Fruit and Shoot Borer (EFSB) is a disease that affects the entirety of the eggplant fruit if not detected. Hence, a detector was proposed in the form of a handheld gun. It was designed and developed to non-invasively classify eggplant fruits that are non-infested and infested with EFSB. Using an Arduino Nano as its microcontroller and a near-infrared spectroscopy (NIRS) module, insect infestation is determined and displayed through its OLED display. Measured reflectance data through the NIRS module of the detector is then stored inside a MicroSD module for further use. Since the prototype was developed for online monitoring, portability was given of utmost importance, pattering the design in the form of a handheld gun, inside of which was powered by a 9V rechargeable battery. The 3D-printed chassis of the detector houses the aforementioned components and modules, alongside with switches for power and near-infrared detection. Through Support Vector Machine (SVM), the classifier model was trained and developed using Jupyter and was extracted as a C++ code for the Arduino Nano module. Compared with a farmer's traditional performance in terms of accuracy, precision, and speed, the prototype performed better with an accuracy of 84%, precision of 72.83%, and an average speed of 9.736 seconds.

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David, Mtweve. "Development of a field deployable handheld electrochemical biosensor for detection of aflatoxin B1 in grains." International Journal of Biosciences (IJB) 25, no. 1 (2024): 242–54. https://doi.org/10.12692/ijb/25.1.242-254.

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Aflatoxins (AFs) are highly toxic, with Aflatoxin B1 (AFB1) being the most harmful, necessitating quick on-site detection to ensure food safety. This study introduces a portable electrochemical biosensor for detecting AFB1 in grains. The biosensor uses a screen-printed electrode (SPE) pretreated in sulfuric acid and modified with bovine serum albumin (BSA) to attach antibodies to the BSA-terminal carboxylic groups, preventing nonspecific AFB1 binding. Modified SPEs were rinsed and stored at 4°C. AFB1 detection was performed using Differential Pulse Voltammetry (DPV) with a wireless portable potentiostat. Absence or low concentrations of AFB1 resulted in a significant increase in DPV peak current, indicating reduced binding of AFB1 to the SPE. Conversely, the presence of AFB1 decreased the DPV peak current, signifying binding of AFB1 to the anti-AFB1 antibodies on the SPE. The signal was transmitted to a cellphone via Bluetooth. The biosensor exhibited a low limit of blank sample (LoB) at 1.67 ng/mL, a low Limit of Detection (LoD) at 2.058 ng/mL, and a dynamic range of 1-20 ng/mL. It was successfully tested on real samples, detecting AFB1 in peanuts and maize flour, indicating its potential for on-site mycotoxin monitoring in food. published by the  International Journal of Biosciences (IJB)

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Clough-Paez, Aaron, Chenglin Yi, Donghun Park, David Elsaesser, Douglas Ketchum, and Daniel R. Hines. "Rapid Prototyping of 3D Printed, High Aspect Ratio, Low Noise Amplifier for Active Handheld Sensor Devices." Journal of Manufacturing and Materials Processing 7, no. 3 (2023): 83. http://dx.doi.org/10.3390/jmmp7030083.

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In this paper, we report the use of additive manufacturing methods to fabricate a high aspect ratio, low noise amplifier (LNA) for a handheld active sensor device operating at up to 1 GHz. The new form factor LNA incorporates a modification of a square-shaped commercial off-the-shelf (COTS) LNA into a 5:1 aspect ratio device without a loss in RF performance. For rapid prototyping, we employ both subtractive and additive manufacturing technologies, such as milling, extrusion-based syringe printing, and aerosol jet printing techniques to fabricate both small form factor and high aspect ratio devices. The 5:1 aspect ratio LNA demonstrated a 20% smaller form factor, a gain of 25 dB, and an NF less than 3 dB over an operating frequency range up to 1 GHz, comparable to the COTS LNA. Design, simulation, and experimental results are given to highlight the advantages of 3D printed hybrid electronic technology over the conventional PCB fabrication method for rapid prototyping of RF electronic devices.

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Khan, Asad Ali, Zhenyong Wang, Dezhi Li, and Ali Ahmed. "A Compact C-Band Multiple-Input Multiple-Output Circular Microstrip Patch Antenna Array with Octagonal Slotted Ground Plane and Neutralization Line for Improved Port Isolation in 5G Handheld Devices." Electronics 13, no. 11 (2024): 2196. http://dx.doi.org/10.3390/electronics13112196.

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In this paper, an eight-port antenna array is presented for 5G handheld terminals to support multiple-input multiple-output (MIMO) operations. The reported design involves three layers: the top contains eight circular microstrip feed elements; the middle is a low-cost FR-4 substrate, and the bottom layer is a ground plane with four etched octagonal slots. Each resonating element is fed by 50-ohm sub-miniature connectors. To mitigate the detrimental effects of mutual coupling of ports and enhance overall isolation between the adjacent microstrip-fed circular patch elements, a neutralization line is strategically implemented between the feed lines of the antenna array. The design configuration involves two elements at each vertex of the printed circuit board (PCB). The overall dimensions of the PCB are 150 × 75 mm2. Each slot and its corresponding radiating elements exhibit linear dual polarization and diverse radiation patterns. The proposed antenna design achieves the required operating bandwidth of more than 1000 MHz spanning from 3 to 4.2 GHz, effectively covering all the upper C-band frequency range of 3.3 GHz to 4.2 GHz allocated for 5G n77 and n78 frequency range 1 (FR1). Required port isolation and lower envelop correlation coefficient (ECC) are achieved for the band of interest. The proposed design gives a peak gain of up to 4 dB for the said band. In addition to these results, degradation in the performance of the antenna array is also investigated during different operating modes of the handheld device. Measured results from the fabricated unit cell and whole array also have a good match with simulated results. On the whole, the proposed antenna possesses the potential to be used in 5G and the open radio access network (ORAN) compliant handheld devices.

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Culmone, Costanza, Kirsten Lussenburg, Joost Alkemade, Gerwin Smit, Aimée Sakes, and Paul Breedveld. "A Fully 3D-Printed Steerable Instrument for Minimally Invasive Surgery." Materials 14, no. 24 (2021): 7910. http://dx.doi.org/10.3390/ma14247910.

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In the field of medical instruments, additive manufacturing allows for a drastic reduction in the number of components while improving the functionalities of the final design. In addition, modifications for users’ needs or specific procedures become possible by enabling the production of single customized items. In this work, we present the design of a new fully 3D-printed handheld steerable instrument for laparoscopic surgery, which was mechanically actuated using cables. The pistol-grip handle is based on ergonomic principles and allows for single-hand control of both grasping and omnidirectional steering, while compliant joints and snap-fit connectors enable fast assembly and minimal part count. Additive manufacturing allows for personalization of the handle to each surgeon’s needs by adjusting specific dimensions in the CAD model, which increases the user’s comfort during surgery. Testing showed that the forces on the instrument handle required for steering and grasping were below 15 N, while the grasping force efficiency was calculated to be 10–30%. The instrument combines the advantages of additive manufacturing with regard to personalization and simplified assembly, illustrating a new approach to the design of advanced surgical instruments where the customization for a single procedure or user’s need is a central aspect.

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Puneeth, S. B., and Sanket Goel. "Handheld and ‘Turnkey’ 3D printed paper-microfluidic viscometer with on-board microcontroller for smartphone based biosensing applications." Analytica Chimica Acta 1153 (April 2021): 338303. http://dx.doi.org/10.1016/j.aca.2021.338303.

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Langerhuizen, David W. G., Job N. Doornberg, Michiel M. A. Janssen, Gino M. M. J. Kerkhoffs, Ruurd L. Jaarsma, and Stein J. Janssen. "Do 3-D Printed Handheld Models Improve Surgeon Reliability for Recognition of Intraarticular Distal Radius Fracture Characteristics?" Clinical Orthopaedics & Related Research 478, no. 12 (2020): 2901–8. http://dx.doi.org/10.1097/corr.0000000000001356.

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Zahia, Sofia, Begonya Garcia-Zapirain, Jon Anakabe, Joan Ander, Oscar Jossa Bastidas, and Alberto Loizate Totoricagüena. "A Comparative Study between Scanning Devices for 3D Printing of Personalized Ostomy Patches." Sensors 22, no. 2 (2022): 560. http://dx.doi.org/10.3390/s22020560.

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This papers presents a comparative study of three different 3D scanning modalities to acquire 3D meshes of stoma barrier rings from ostomized patients. Computerized Tomography and Structured light scanning methods were the digitization technologies studied in this research. Among the Structured Light systems, the Go!Scan 20 and the Structure Sensor were chosen as the handheld 3D scanners. Nineteen ostomized patients took part in this study, starting from the 3D scans acquisition until the printed ostomy patches validation. 3D mesh processing, mesh generation and 3D mesh comparison was carried out using commercial softwares. The results of the presented study show that the Structure Sensor, which is the low cost structured light 3D sensor, has a great potential for such applications. This study also discusses the benefits and reliability of low-cost structured light systems.

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E., Akhila* K. Ramesh. "DPSK-DWT OFDM SYSTEM FOR RELIABLE DATA TRANSMISSION USING BARCODE SYSTEM IN MOBILE DEVICES." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 5, no. 11 (2016): 11–17. https://doi.org/10.5281/zenodo.164898.

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DPSK-OFDM modulation scheme is implemented in the proposed work to handle the complexity issue in flexible manner for hassle-free data transmission in mobile devices. Barcode scheme has ability to convert the readable form of information into un-understandable form to provide complexity free transmission. Barcode printed on paper has interference free appearance which does not have any leakages while digital barcodes has observed while pixels are leaked into their corresponding black pixels which is called as intersymbol interference. The proposed barcode based DPSK-OFDM system are designed to reduce the issues frequently occurs in handheld device transmission with low complexity and high performance as resultant outcome. The contribution work continued to proposed work is implemented on DWT-OFDM which results in low complexity than the proposed work with high performance as outcome.

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Kushwaha, Alok K., Minqi Ji, Sneha Sethi, Lisa Jamieson, Robert A. McLaughlin, and Jiawen Li. "A Novel Small Form-Factor Handheld Optical Coherence Tomography Probe for Oral Soft Tissue Imaging." Micromachines 15, no. 6 (2024): 742. http://dx.doi.org/10.3390/mi15060742.

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Tissue imaging is crucial in oral cancer diagnostics. Imaging techniques such as X-ray imaging, magnetic resonance imaging, optical coherence tomography (OCT) and computed tomography (CT) enable the visualization and analysis of tissues, aiding in the detection and diagnosis of cancers. A significant amount of research has been conducted on designing OCT probes for tissue imaging, but most probes are either heavy, bulky and require external mounting or are lightweight but straight. This study addresses these challenges, resulting in a curved lightweight, low-voltage and compact handheld imaging probe for oral soft tissue examination. To the best of our knowledge, this is the first curved handheld OCT probe with its shape optimized for oral applications. This probe features highly compact all-fiber optics with a diameter of 125 μm and utilizes innovative central deflection magnetic actuation for controlled beam scanning. To ensure vertical stability while scanning oral soft tissues, the fiber was secured through multiple narrow slits at the probe’s distal end. This apparatus was encased in a 3D-printed angular cylinder tube (15 mm outer diameter, 12 mm inner diameter and 160 mm in length, weighing < 20 g). An angle of 115° makes the probe easy to hold and suitable for scanning in space-limited locations. To validate the feasibility of this probe, we conducted assessments on a multi-layered imaging phantom and human tissues, visualizing microstructural features with high contrast.

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Ritzert, Nicole L., Asha Rani, Tae-Jun Ko, Jeffrey J. Kim, and Shin Ae Kim. "Multifunctional Periodontal Probes and Their Handheld Electronic System for Simultaneous Temperature, pH, and Depth Measurements." Journal of The Electrochemical Society 169, no. 2 (2022): 027515. http://dx.doi.org/10.1149/1945-7111/ac50e4.

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Microscale temperature and pH sensors, contained within an area of 125 μm × 750 μm, were fabricated on disposable 3D printed periodontal probe tips (0.5-mm diameter) with Marquis color-coded calibration marks using microfabrication and electrochemical methods. The probe tips were inserted in a reusable, wireless handheld electronic system that records the temperature and pH of specific oral sites such as a gingival sulcus. The linear response and precision of each sensor were tested in solutions of varying temperature and pH representing the physiological range of the oral cavity. The temperature and pH sensors showed linear response from 25 °C to 60 °C (±0.1 °C) and pH 4.0 to pH 8.0 (±0.1 pH unit), respectively. A calibration function performed by the system software increased precision between probes tenfold for temperature sensors (deviation range: 0.69 °C to –0.07 °C) and twofold for pH sensors (deviation range: 0.07 to 0.04). Wireless communication along with compatible software provides portability and facilitates chairside use. Simultaneous measurement of temperature and pH along with gingival sulcus depth may detect early signs of inflammation that current methods, such as probing and radiography, may not identify, thus minimizing potential tissue damage caused by periodontal disease.

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Glasco, Dalton Lee, Anjaiah Sheelam, Nguyen H. B. Ho, and Jeffrey Gordon Bell. "Levodopa Sensing in Human Sweat Using 3D Printed Sensors and a Smartphone." ECS Meeting Abstracts MA2024-01, no. 50 (2024): 2734. http://dx.doi.org/10.1149/ma2024-01502734mtgabs.

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Parkinson’s disease (PD) is one of the leading neurological disorders negatively impacting health on a global scale. Patients diagnosed with PD require frequent monitoring, prescribed medications, and therapy for extended periods as symptom severity worsens. The primary pharmaceutical treatment for PD patients is levodopa (L-Dopa) which reduces many symptoms experienced by PD patients (e.g., tremors, cognitive ability, motor dysfunction, etc.) through the regulation of dopamine levels in the body. Herein, the first detection of L-Dopa in human sweat using a low-cost 3D printed sensor with a simple and rapid fabrication protocol combined with a portable potentiostat wirelessly connected to a smartphone via Bluetooth is discussed. By combining saponification and electrochemical activation into a single protocol, the optimized 3D printed carbon electrodes were able to simultaneously detect uric acid and L-Dopa throughout their biologically relevant ranges. The optimized sensors provided a sensitivity of 83 + 3 nA/µM from 24 µM to 300 nM L-Dopa. Common physiological interferents found in sweat (e.g., ascorbic acid, glucose, caffeine) showed no influence on the response for L-Dopa. Lastly, a percent recovery of L-Dopa in human sweat using a smartphone-assisted handheld potentiostat resulted in the recovery of 100 + 8 %, confirming the ability of this sensor to accurately detect L-Dopa in sweat.

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Journal articles on the topic 'Handheld printer'

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