An accurate AC-Dc voltage transfer standard test system using the differential and the dual-channel method

1993 ◽  
Vol 42 (2) ◽  
pp. 630-634 ◽  
Author(s):  
K. Takahashi ◽  
H. Sasaki ◽  
M. Klonz ◽  
T. Endo
Keyword(s):  
Test System ◽  
Standard Test ◽  
Dc Voltage ◽  
Transfer Standard ◽  
Dual Channel

scholarly journals A Microtester for Measuring the Reliability of Microdevices in Controlled Environmental Conditions

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 585
Author(s):  
Yunjia Li ◽  
Weitao Dou ◽  
Chenyuan Zhou ◽  
Xinyi Wang ◽  
Aijun Yang ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Environmental Parameters ◽  
Test System ◽  
Standard Test ◽  
Electrical Parameters ◽  
Vibration Energy Harvester ◽  
Electromagnetic Vibration ◽  
Small Footprint ◽  
Humidity Range ◽  
Decoupling Algorithm

A miniaturized reliability test system for microdevices with controlled environmental parameters is presented. The system is capable of measuring key electrical parameters of the microdevices while controlling the environmental conditions around the microdevices. The test system is compact and thus can be integrated with standard test equipment for microdevices. By using a feed-forward decoupling algorithm, the presented test system is capable of generating a temperature range of 0–120 °C and a humidity range of 20–90% RH (0–55 °C), within a small footprint and weight. The accuracy for temperature and humidity control is ±0.1 °C and ±1% RH (30 °C), respectively. The functionality of the proposed test system is verified by integrating it with a piezo shaker to test the environmental reliability of an electromagnetic vibration energy harvester. The proposed system can be used as a proof-of-technology platform for characterizing the performance of microdevices with controlled environmental parameters.

Determining Elastic-Plastic Properties of Al6061-T6 from Micro-Indentation Technique

2013 ◽  
Vol 592-593 ◽  
pp. 610-613
Author(s):  
Sina Amiri ◽  
Nora Lecis ◽  
Andrea Manes ◽  
Davide Mombelli ◽  
Marco Giglio
Keyword(s):  
Manufacturing Process ◽  
Optimization Procedure ◽  
Test System ◽  
Standard Test ◽  
Material Behavior ◽  
Plastic Properties ◽  
Representative Strain ◽  
Elastic Plastic ◽  
Dimensionless Analysis ◽  
Micro Indentation

Different approaches have been proposed in order to determine the material behavior of ductile materials. Since, the mechanical properties of a mechanical component are modified during manufacturing process due to plastic deformation, heat treatment and etc, a non-destructive indentation experimental procedure addressed to predict the elastic-plastic properties of material after manufacturing process is of interest. This is especially true for small size components where it is complex to extract specimens to test on standard test system. Based on dimensionless analysis and the concept of a representative strain, different approaches have been proposed to determine the material properties of power law materials by using indentation process. In this work, the Johnson-Cook (JC) constitutive model of the aluminum alloy Al6061-T6 is characterized by means of a well-defined optimization procedure based on micro-indentation testing and high fidelity finite element models and an optimization procedure but without the concept of dimensionless analysis and a representative strain. This methodology allows determining a set of JC constants for Al6061-T6. The obtained results have good agreement with parameters calibrated by means of universal standard tests and reverse engineering approach.

Solving Environmental/Economic Dispatch Problem

2010 ◽  
pp. 123-145
Author(s):  
M.A. Abido
Keyword(s):  
Environmental Economic ◽  
Economic Dispatch ◽  
Test System ◽  
Standard Test ◽  
Pareto Optimal ◽  
Pareto Optimal Solutions ◽  
Optimal Solutions ◽  
Swarm Optimization ◽  
Nondominated Solutions ◽  
Multiobjective Particle Swarm Optimization

Multiobjective particle swarm optimization (MOPSO) technique for environmental/economic dispatch (EED) problem is proposed and presented in this work. The proposed MOPSO technique evolves a multiobjective version of PSO by proposing redefinition of global best and local best individuals in multiobjective optimization domain. The proposed MOPSO technique has been implemented to solve the EED problem with competing and non-commensurable cost and emission objectives. Several optimization runs of the proposed approach have been carried out on a standard test system. The results demonstrate the capabilities of the proposed MOPSO technique to generate a set of well-distributed Pareto-optimal solutions in one single run. The comparison with the different reported techniques demonstrates the superiority of the proposed MOPSO in terms of the diversity of the Pareto optimal solutions obtained. In addition, a quality measure to Pareto optimal solutions has been implemented where the results confirm the potential of the proposed MOPSO technique to solve the multiobjective EED problem and produce high quality nondominated solutions.

Constrained Multi-Objective Differential Evolution for Security Constrained Economic/Environmental Dispatch

2013 ◽  
Vol 291-294 ◽  
pp. 817-822
Author(s):  
Tian Yang Zhao ◽  
Guo Bing Qiu ◽  
Ying Zhi Li ◽  
Wen Xia Liu ◽  
Jian Hua Zhang
Keyword(s):  
Differential Evolution ◽  
High Efficiency ◽  
Optimization Technique ◽  
Test System ◽  
Standard Test ◽  
Feasible Region ◽  
Multi Objective

A newly constrained multi-objective differential evolution optimization technique (CMODE) for security constrained economic/environmental dispatch (EED) was proposed. The proposed CMODE evolved a constrained multi-objective version of differential evolution (DE) by employing the traditional multi-objective differential evolution (DEMO) and constrain handle technique to balance the search between feasible region and infeasible region. The proposed CMODE method had been applied to solve the security constrained EED problem. Experiments had been carried on a standard test system. The results demonstrate the high efficiency of the proposed method to solve security constrained EED problem, and the necessary of taking security constrains into consideration.

scholarly journals Field and mesocosm methods to test biodegradable plastic film under marine conditions

2020 ◽  
Author(s):  
Christian Lott ◽  
Andreas Eich ◽  
Boris Unger ◽  
Dorothée Makarow ◽  
Glauco Battagliarin ◽  
...  
Keyword(s):  
Marine Environment ◽  
Aquatic Ecosystems ◽  
Emerging Market ◽  
Field Tests ◽  
Biodegradable Plastics ◽  
Test System ◽  
Test Methods ◽  
Standard Test ◽  
Biodegradable Plastic ◽  
Reliable Assessment

AbstractThe pollution of the natural environment, especially the world’s oceans, with conventional plastic is of major concern. Biodegradable plastics are an emerging market bringing along potential chances and risks. The fate of these materials in the environment and their possible effects on organisms and ecosystems has rarely been studied systematically and is not well understood. For the marine environment, reliable field test methods and standards for assessing and certifying biodegradation to bridge laboratory respirometric data are lacking. In this work we present newly developed field tests to assess the performance of (biodegradable) plastics under natural marine conditions. These methods were successfully applied and validated in three coastal habitats (eulittoral, benthic and pelagic) and two climate zones (Mediterranean Sea and tropical Southeast Asia). Additionally, a stand-alone mesocosm test system which integrated all three habitats in one technical system at 400-L scale independent from running seawater is presented as a methodological bridge. Films of polyhydroxyalkanoate copolymer (PHA) and low density polyethylene (LD-PE) were used to validate the tests. While LD-PE remained intact, PHA disintegrated to a varying degree depending on the habitat and the climate zone. Together with the existing laboratory standard test methods, the field and mesocosm test systems presented in this work provide a 3-tier testing scheme for the reliable assessment of the biodegradation of (biodegradable) plastic in the marine environment. This toolset of tests can be adapted to other aquatic ecosystems.

scholarly journals Influence of radiation on endotoxin test using the PTS TM for 18-FDG radiopharmaceutical

2010 ◽  
Vol 46 (3) ◽  
pp. 551-554
Author(s):  
Ralph Santos-Oliveira
Keyword(s):  
United States ◽  
The United States ◽  
Test System ◽  
Standard Test ◽  
United States Pharmacopeia ◽  
Nuclear Engineering ◽  
Pet Ct ◽  
Effects Of Radiation ◽  
States Pharmacopeia ◽  
Engineering Institute

F-18 FDG (2-[18-F] fluoro-2-deoxy-D-glucose) is the most frequently used radiopharmaceutical for PET and PET CT imaging exams. The FDA recently approved the use of the PTS TM (Portable Test System) as an alternative to the standard test proposed by the United States Pharmacopeia using the LAL (Limulus Amebocyte Lysates), that takes longer to perform (about 1h) than the PTS TM (15 min). Recent studies have demonstrated that radiation could interfere with the PTS TM test. In order to study the effects of radiation on the PTS TM test and/or equipment, 27 batches of F-18 FDG produced in the Nuclear Engineering Institute were analyzed. The results showed that no direct correlation with radiation was found in any of the cases.

Inhibition of Fibrinolysis in the Burned-Infected Rat: Antiplasmin Induced by Burn Wound Infection

1976 ◽  
Vol 36 (01) ◽  
pp. 173-181
Author(s):  
W. A Andes ◽  
R. B Lindberg ◽  
D. D McEuen ◽  
J. P Baron
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Test System ◽  
Standard Test ◽  
Infected Group ◽  
Acid Neutralization ◽  
Plasmin Activity ◽  
Burn Wound ◽  
Burned Patient ◽  
Lysis Time ◽  
Euglobulin Lysis Time

SummaryInfection is the leading cause of death in the burned patient. To study the effects of uncomplicated and lethally-infected burn wounds on certain hematologic indices, a dorsal scald burn was administered to 250 rats. One group was then infected with Pseudomonas aeruginosa. These rats expired within 10 days. A burned, uninfected, group survived. Sequential determinations were made of fibrinogen, fibrinolysis, antiplasmins, plasminogen antiactivators, cultures, and autopsy findings.Fibrinogen concentrations were higher in the infected animals within 2 days postbum and at day 3 (p <0.05). Plasminogen levels fell precipitously 3 days postburn in the burned-infected group. Acid neutralization of antiplasmins was not entirely effective. Serum from infected animals markedly prolonged the lysis time of clots in a standard test system, lowered plasmin activity in the caseinolytic assay, and transiently prolonged the euglobulin lysis time.The cause of these findings remains unknown. The marked fall in plasminogen in the infected animals may be entirely due to unneutralized antiplasmin activity and was coincident with a decline in fibrin-related antigens. These antiplasmins may exert deleterious effects on microcirculatory dynamics and were closely linked to the animals’ demise.

scholarly journals Phase Measurement Units based FACT’s Devices for the Improvement of Power Systems Networks Controllability

2018 ◽  
Vol 8 (2) ◽  
pp. 888 ◽  
Author(s):  
Husham Idan Hussein ◽  
Ghassan Abdullah Salman ◽  
Mohammed Saadi Hasan
Keyword(s):  
Power Systems ◽  
Power System ◽  
Phase Measurement ◽  
Test System ◽  
Standard Test ◽  
Communication Link ◽  
Graph Theoretic ◽  
Facts Devices ◽  
Angle Data ◽  
Measurement Units

This paper describes the importance of FACTS devices; it presents the outcome of the study of its reflectance on the performance of power system networks. It seeks to increase and guarantee the fact and accuracy of response systems under disturbance conditions when the phase measurement units are introduced as Real-Time Measurement (RTM) stations. This paper also describes the importance of FACTS devices. The combination of FACTS devices and PMUs is presented to increase the controllability performance of power systems. This paper demonstrates how PMUs measure voltage, current and their angles. It provides, through a communication link, a Phase Angle Data Concentrator (PDC) to make an appropriate decision to correct the power system state using the FACTS device (TCSC). We utilized the Graph-Theoretic Algorithm to optimize the number and location of PMUs. The technique proposed was tested on the Iraqi National Super Grid’s 24bus network, Diyala City’s regional 10bus network and the 14bus IEEE standard test system. The MATLAB/PSAT package was utilized for the simulation of results. It is evident that our proposed algorithm and technique achieved the purpose of this paper as confirmed by the level of accuracy of the results obtained from most of the cases tested.

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