Thematische Bibliographien / Virtual multimeter

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Auswahl der wissenschaftlichen Literatur zum Thema „Virtual multimeter“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 10. Februar 2022

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Zeitschriftenartikel zum Thema "Virtual multimeter"

Chou, Jung-Chuan, und Wei-Chuan Chen. „VIRTUAL INSTRUMENT APPLIED TO MULTIELECTRODE DETECTION“. Biomedical Engineering: Applications, Basis and Communications 21, Nr. 06 (Dezember 2009): 375–79. http://dx.doi.org/10.4015/s1016237209001489.

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The sensor is a kind of device about electrochemical science, its applications include clinical and environmental analyses, physiology, and process control; therefore, how to accurately detect the signal of the sensor is one of the most important things for analyzing the characteristics of sensor. For potentiometric device, this study relates to a multielectrode measurement system based on the programable software, LabVIEW, forming a virtual instrument (VI). This system is built as a voltage versus time (V–T) framework and a dynamic detection system. We selected two devices, a digital multimeter (HP 34401A) and a homemade VI, synchronously to measure the sources of a direct current (DC) signal and an electrode cell (EC), respectively. The maximum errors between the two devices are 0.639 mV in DC supply and 0.345 mV in EC supply, which specifies that the efficiency of design measurement system is good for detection.

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Li, Hai Ming, Li Mei Zhang und Feng Sa. „Design the Integrated Multipurpose Instrument Calibrating Equipment Based on the PXI and LabVIEW“. Advanced Materials Research 1037 (Oktober 2014): 134–38. http://dx.doi.org/10.4028/www.scientific.net/amr.1037.134.

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According to the function, the technical indexes and the cost control etc, we select the embedded control computer and virtual instrument module based on the PXI, and developed the integrated multipurpose instrument calibrating equipment, it realized the field measurement and calibration of the electrical instrument away from the laboratory. The system is designed based on PXI and LabVIEW, it uses virtual instrument technology, automatic control technology and database technology, by combining these functional modules of NI, we realized the calibration of electrical instruments such as digital multimeter, signal generator, oscilloscope and cymometer etc. The system is used integrated design, and it is very flexible, it can be popularized and applied as working standard to troops, factories or schools etc.

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Nguyen, Quoc Manh. „Study Computational Simulation and Experimental of Butt-Joint by Visual-Weld Software and MIG Welding Process“. Applied Mechanics and Materials 889 (März 2019): 161–67. http://dx.doi.org/10.4028/www.scientific.net/amm.889.161.

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The aim of this paper is to present the simulation and experiment of the welding butt-joint aluminum alloys to low carbon steel using Visual-weld software and the metal inert gas (MIG) welding process. The workpiece is set up in a virtual environment with an area of 150 x 70 x 5 mm, a welding speed at 3.5 mm/s, and a heating source of 2.5 kW. The finite element method (FEM) is used as a powerful tool in simulating, calculating and predicting the welding stress and distortion at the early stage of the design process and development of welding products. The metallurgical process, deformation, hardness, etc. are investigated using the FEM in Sysweld software. The microstructure of the intermetallic layer is observed using scanning electron microscopy. The hardness of the intermetallic layer is examined using Vickers hardness testing. Tensile strength and bending strength are examined by tensile and compress multimeter equipment. To improve the quality of the aluminum/steel welds, the IMCs layer should be as small as possible. The experimental results are better if the welding current of range of 95 – 100 A and the welding speed is from 3.5 to 4 mm/s.

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Hayami, Tomonori, Junichi Higo, Haruki Nakamura und Kota Kasahara. „Multidimensional virtual‐system coupled canonical molecular dynamics to compute free‐energy landscapes of peptide multimer assembly“. Journal of Computational Chemistry 40, Nr. 28 (07.07.2019): 2453–63. http://dx.doi.org/10.1002/jcc.26020.

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Haberichter, Sandra L., Paula M. Jacobi, Veronica H. Flood, Pamela A. Christopherson, Joan Cox Gill, Daniel B. Bellissimo und Kenneth D. Friedman. „Quantitative Analysis of VWF Multimer Structure: Discrimination Between VWD Subtypes“. Blood 118, Nr. 21 (18.11.2011): 1215. http://dx.doi.org/10.1182/blood.v118.21.1215.1215.

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Abstract Abstract 1215 The diagnosis of von Willebrand disease (VWD) and discrimination between its subtypes includes analysis of VWF:Ag, VWF:RCo, and VWF multimer structure. VWF multimer analysis is qualitative, and therefore a subjective assessment open to interpretation. It is often difficult to assess subtle differences in multimer structure. To address these shortcomings we have developed a quantitative method for analysis of VWF multimers. We have analyzed multimer structure for VWD patients and healthy controls recruited through the Zimmerman Program for the Molecular and Clinical Biology of von Willebrand Disease (ZPMCB-VWD). The patient population includes type 1 and type 2 VWD with well-defined genotypes and phenotypes. Multimer analysis was performed using a 0.65% LiDS-agarose gel electrophoresis system and western blotting with chemilumiscent detection using the Fujifilm LAS-3000 luminescent image analyzer. Densitometry was performed and area-under-the-curve calculated using MultiGauge analysis software. We calculated the percentage of low molecular weight (LMW) multimers defined as bands 1 – 5, mid-molecular weight (MMW) multimers (bands 6 – 10) and high molecular weight (HMW) multimers (bands >10). For healthy controls, the distribution of multimer density (mean ± standard deviation) was 25.3 ± 2.7% HMW, 56.1 ± 4.9% MMW, and 18.6 ± 3.4% LMW. Type 1 VWD (including type 1C) patients had a similar distribution of multimers (22.5 ± 7.6% HMW, 48.5 ± 6.7% MMW, 29.0 ± 7.2 % LMW), although there was a slight shift in distribution to increased LMW. For some type 1C patients with mutations including C1130Y and W1144G, we observed a small loss of HMW multimers (14.2 ± 0.8% HMW, 51.1 ± 1.4% MMW, 34.7 ± 2.3% LMW), as has been previously reported in patients with a C1130F variation. In contrast, some patients with the type 1C “Vicenza” mutation, R1205H, demonstrated increased HMW multimers (32.6 ± 1.0% HMW, 42.2 ± 4.0% MMW, 25.2 ± 3.0% LMW) as previously reported. Although the multimers in the type 1 patients are essentially normal, quantitative analysis reveals subtle abnormalities in structure. In type 2B VWD patients with mutations including V1316M, R1306W, and R1341W, a loss of HMW and MMW multimers was observed (7.1 ± 3.2% HMW, 40.4 ± 8.3% MMW, and 52.5 ± 11.4% LMW). A greater loss of HMW and MMW multimers was observed in patients with type 2A VWD with mutations including Y1349C, R1597W, G1609R, I1628T, G1631D, and G1670S (3.5 ± 6.2% HMW, 19.7 ± 20.4% MMW, and 76.9 ± 26.3% LMW). The type 2A subjects consisted of two groups: those with a virtually complete loss of HMW and MMW (0.0 ± 0% HMW, 4.0 ± 1.0% MMW, and 96.0 ± 1.0% LMW), and those with loss of HMW and decreased MMW (8.7 ± 7.5% HMW, 41.0 ± 14.7% MMW, and 50.3 ± 20.9% LMW). The latter group had a similar multimer distribution to that of type 2B VWD subjects. While most type 2A patients with mutations associated with increased susceptibility to ADAMTS13 proteolysis had severe multimer abnormalities (>95% LMW), some had only moderate abnormalities. Our study demonstrates that quantitative analysis of VWF multimer patterns more clearly distinguishes patients with various subtypes of VWD than subjective analysis. Although one of the two groups of type 2A patients is similar to the type 2B group, the other group is clearly different and is associated with specific genotypes, perhaps eliminating the need for DNA sequence analysis to make a definitive diagnosis for this group. This technique provides an objective measure of VWF structure to better characterize subtle changes observed in the subtypes of VWD and may help to determine the nature of any additional clinical laboratory testing to reach a clear-cut diagnosis. Disclosures: No relevant conflicts of interest to declare.

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Simin, Karl, Emily A. Bates, Michael A. Horner und Anthea Letsou. „Genetic Analysis of Punt, a Type II Dpp Receptor That Functions Throughout the Drosophila melanogaster Life Cycle“. Genetics 148, Nr. 2 (01.02.1998): 801–13. http://dx.doi.org/10.1093/genetics/148.2.801.

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Abstract TGF-β- (transforming growth factor-β-) mediated signal transduction affects growth and patterning in a variety of organisms. Here we report a genetic characterization of the Drosophila punt gene that encodes a type II serine/threonine kinase TGF-β/Dpp (Decapentaplegic) receptor. Although the punt gene was originally identified based on its requirement for embryonic dorsal closure, we have documented multiple periods of punt activity throughout the Drosophila life cycle. We demonstrate that potentially related embryonic punt phenotypes, defects in dorsoventral patterning and dorsal closure, correspond to distinct maternal and zygotic requirements for punt. In addition, we document postembryonic requirements for punt activity. The tight correspondence between both embryonic and postembryonic loss-of-function punt and dpp phenotypes implicates a role for Punt in mediating virtually all Dpp signaling events in Drosophila. Finally, our comparison of punt homoallelic and heteroallelic phenotypes provides direct evidence for interallelic complementation. Taken together, these results suggest that the Punt protein functions as a dimer or higher order multimer throughout the Drosophila life cycle.

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He, Rong, Sheri Crow, Lyle D. Joyce, Carmelo Milano, John A. Heit und Dong Chen. „Detection of Continuous Flow Left Ventricular Assist Device -Associated Acquired Von Willebrand Factor (VWF) Abnormality by An Automated Immunoturbidimetric VWF Activity Assay“. Blood 118, Nr. 21 (18.11.2011): 2273. http://dx.doi.org/10.1182/blood.v118.21.2273.2273.

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Abstract Abstract 2273 Background: Continuous flow left ventricular assist device (CF-LVAD) recipients have high tendency of post-surgical gastrointestinal (GI) bleeding. We previously described the loss of high molecular weight VWF multimers (HMWM), due to either an accelerated clearance or enhanced cleavage of the HMWM, in most CF-LVAD recipients (Ann Thorac Surg. 90:1263–9). However, besides the tedious plasma VWF multimer analysis, neither VWF ristocetin cofactor nor collagen binding activity assay provides sufficient sensitivity for detecting such an acquired VWF abnormality (AVWA). In this study, we examined a new automated latex particle-enhanced immunoturbidimetric VWF activity assay (VWF:Lx) for its ability of detecting CF-LVAD-AVWA. We also analyzed the VWF pro-peptide (VWF:pp) to explored the potential mechanism of CF-LVAD-AVWA. Design: As part of an on-going prospective multicenter study, pre- and post-CF-LVAD implantation (7, 30 days and 5–7 months) blood samples were collected from 15 LVAD recipients (median age 52 years; 10 male and 5 female; 2008∼2009). Plasma VWF antigen (VWF:Ag), VWF:Lx activity, VWF:pp/Ag ratios were measured; and plasma VWF multimer analyses were performed on all available plasma samples. Standard statistical analyses were employed. Result: Loss of VWF HMWM was observed in 3 patients prior to CF-LVAD implantation and virtually all patients after surgery. VWF:Ag, VWF:Lx or VWF:pp/Ag ratios of the pre- and post-implantation samples were not significantly different (P> 0.1). However, VWF:Lx/Ag ratios of the post-implantation samples were significantly decreased (P<0.05). At a cut off of 0.8, the VWF:Lx/Ag ratio has a 90% sensitivity and specificity for detecting AVWA. Conclusions: VWF:Lx/Ag ratio has excellent sensitivity and specificity in detecting CF-LVAD-AVWA, and its impact on predicting post-surgical bleeding tendency in CF-LVAD recipients is being investigated. The distinct CF-LVAD-AVWA is most likely caused by enhanced cleavage, rather than clearance, of the HMWM. Disclosures: No relevant conflicts of interest to declare.

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Misra, V., S. Walter, P. Yang, S. Hayes und P. O'Hare. „Conformational alteration of Oct-1 upon DNA binding dictates selectivity in differential interactions with related transcriptional coactivators.“ Molecular and Cellular Biology 16, Nr. 8 (August 1996): 4404–13. http://dx.doi.org/10.1128/mcb.16.8.4404.

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VP16 (termed VP16-H here) of herpes simplex virus (HSV) belongs to a family of related regulatory proteins which includes VP16-B of bovine herpesvirus (BHV). We show that VP16-B, while also being a powerful transactivator of transcription dependent on Oct-1 binding sites in its target promoters, has virtually no activity on a defined VP16-H-responsive, octamer-containing target promoter. While Oct-1 binds equally well to the VP16-B-responsive and -nonresponsive sites, VP16-B interacts with Oct-1 only when Oct-1 is bound to the BHV octamer site and not when it is bound to the HSV site. We show from the analysis of chimeric proteins that the ability of VP16-B to discriminate between the Oct-1 forms depends on features of its N-terminal region. We also show from an analysis of chimeric DNA motifs that sequences that lie 3' to the POU domain-contacting region of the HSV octamer site play a role in making it unresponsive to VP16-B. Finally, we show by high-resolution hydroxyl radical footprint analysis that the conformation of Oct-l is different on the two sites. These results augment our previous report on an allosteric effect of DNA signals on the conformation of bound proteins and indicate that different conformations of the same DNA binding protein can be recognized selectively by related members of interacting regulatory proteins. The possible implications of our observations for selective gene regulation by Oct-1, a ubiquitous transcription factor, and other multimember transcription families are discussed.

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Carew, JA, PJ Browning und DC Lynch. „Sulfation of von Willebrand factor“. Blood 76, Nr. 12 (15.12.1990): 2530–39. http://dx.doi.org/10.1182/blood.v76.12.2530.2530.

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Abstract von Willebrand factor (vWF) is a multimeric adhesive glycoprotein essential for normal hemostasis. We have discovered that cultured human umbilical vein endothelial cells incorporate inorganic sulfate into vWF. Following immunoisolation and analysis by polyacrylamide or agarose gel electrophoresis, metabolically labeled vWF was found to have incorporated [35S]-sulfate into all secreted multimer species. The time course of incorporation shows that sulfation occurs late in the biosynthesis of vWF, near the point at which multimerization occurs. Quantitative analysis suggests the presence, on average, of one molecule of sulfate per mature vWF subunit. Virtually all the detectable sulfate is released from the mature vWF subunit by treatment with endoglycosidases that remove asparagine-linked carbohydrates. Sulfated carbohydrate was localized first to the N-terminal half of the mature subunit (amino acids 1 through 1,365) by partial proteolytic digestion with protease V8; and subsequently to a smaller fragment within this region (amino acids 273 through 511) by sequential digestions with protease V8 and trypsin. Thus, the carbohydrate at asparagine 384 and/or 468 appears to be the site of sulfate modification. Sodium chlorate, an inhibitor of adenosine triphosphate- sulfurylase, blocks sulfation of vWF without affecting either the ability of vWF to assemble into high molecular weight multimers or the ability of vWF multimers to enter Weible-Palade bodies. The stability of vWF multimers in the presence of an endothelial cell monolayer also was unaffected by the sulfation state. Additionally, we have found that the cleaved propeptide of vWF is sulfated on asparagine-linked carbohydrate.

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Carew, JA, PJ Browning und DC Lynch. „Sulfation of von Willebrand factor“. Blood 76, Nr. 12 (15.12.1990): 2530–39. http://dx.doi.org/10.1182/blood.v76.12.2530.bloodjournal76122530.

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von Willebrand factor (vWF) is a multimeric adhesive glycoprotein essential for normal hemostasis. We have discovered that cultured human umbilical vein endothelial cells incorporate inorganic sulfate into vWF. Following immunoisolation and analysis by polyacrylamide or agarose gel electrophoresis, metabolically labeled vWF was found to have incorporated [35S]-sulfate into all secreted multimer species. The time course of incorporation shows that sulfation occurs late in the biosynthesis of vWF, near the point at which multimerization occurs. Quantitative analysis suggests the presence, on average, of one molecule of sulfate per mature vWF subunit. Virtually all the detectable sulfate is released from the mature vWF subunit by treatment with endoglycosidases that remove asparagine-linked carbohydrates. Sulfated carbohydrate was localized first to the N-terminal half of the mature subunit (amino acids 1 through 1,365) by partial proteolytic digestion with protease V8; and subsequently to a smaller fragment within this region (amino acids 273 through 511) by sequential digestions with protease V8 and trypsin. Thus, the carbohydrate at asparagine 384 and/or 468 appears to be the site of sulfate modification. Sodium chlorate, an inhibitor of adenosine triphosphate- sulfurylase, blocks sulfation of vWF without affecting either the ability of vWF to assemble into high molecular weight multimers or the ability of vWF multimers to enter Weible-Palade bodies. The stability of vWF multimers in the presence of an endothelial cell monolayer also was unaffected by the sulfation state. Additionally, we have found that the cleaved propeptide of vWF is sulfated on asparagine-linked carbohydrate.

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Dissertationen zum Thema "Virtual multimeter"

Bilík, Petr. „Virtuální měřicí přístroje pro podporu výuky“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442484.

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This diploma thesis deals with the creation of the Virtual Measuring Instruments web application. This tool mainly enables us to simulate the real measuring instruments widely used in the laboratories of FEEC BUT. It is intended to serve students for initial acquaintance with specific devices. The theoretical part is focused on the research into the web applications programming and suitable programming languages to implement the proposed application are selected. Furthermore, the specific virtualized devices are described. The result of the experimental part consists in creating a universal application interface to extend the proposed application with other devices. Finally, the specific tests of the developed platform are presented.

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Konferenzberichte zum Thema "Virtual multimeter"

Wu, Zhengling, und Haiyan Wu. „Design of Virtual Multimeter Based on VIIS-EM Platform“. In 2016 6th International Conference on Applied Science, Engineering and Technology. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icaset-16.2016.6.

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Patrascoiu, Nicolae, und Ioana Camelia Barbu. „Data-logger built using a digital multimeter and virtual instrumentation“. In 14th International Carpathian Control Conference (ICCC). IEEE, 2013. http://dx.doi.org/10.1109/carpathiancc.2013.6560555.

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Evstatiev, Boris, Katerina Gabrovska-Evstatieva, Yordan Doychinov, Ivaylo Stoyanov und Teodor Iliev. „Design and Implementation of a Virtual Multimeter in the EVEEE Environment“. In 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE). IEEE, 2019. http://dx.doi.org/10.1109/atee.2019.8724996.

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Patrascoiu, Nicolae, und Ioana Camelia Barbu. „Data logger Built using the MS8050 bench multimeter and virtual instrumentation“. In 2016 17th International Carpathian Control Conference (ICCC). IEEE, 2016. http://dx.doi.org/10.1109/carpathiancc.2016.7501212.

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Panchapakesan, Rajagopal, und Kwang W. Oh. „Streaming Potential Measurement in Live Plants for Energy Harvesting Applications“. In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11562.

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We propose a convenient and easy method to harvest electric potential from plants based on streaming energy. Streaming potential and streaming current are well known phenomenon in the field of microfluidics. Plants also possess micron sized negatively charged xylem and phloem conduits where ionic sap fluid move by virtue of plant pressure. We predict that the movement of ionic sap could cause a streaming potential difference between the upper and lower portions of the stem. Two 400 μm thick Ag/AgCl electrodes probes were implanted (one at near the root and the other near the shoot) and sealed with PDMS resin. A multichannel multimeter was employed to continuously monitor and record the potential difference across the two probes. Thus a clear understanding of the streaming potential in plant system can be obtained.

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