Design of Electronic Devices Stress Testing System with Charging Line Based Impulse Generator

Carbon nanotube (CNT) has a great tolerance to high current density which is a cause of electromigration (EM). Therefore, CNT is expected to use as the materials of nanoscale components of electronic devices. The damage mechanisms of CNT are regarded as the effects of oxidation by Joule heating and/or the EM by high-density electron flows. In this study, we investigated the damage mechanism of CNT structures used as nano-component of electronic devices. An EM acceleration testing system was designed using the CNT structures collected at the gap of thin-film electrodes. The EM tests were conducted under the several kinds of current density conditions and the surrounding environments. An indicator of lifetime was determined by voltage measurements during the acceleration tests and their fracture phenomena were evaluated by means of microscopic observations. As the results, the amounts of lifetime of CNT were longer in the lower oxygen concentrations than in the air condition. In the microscopic studies, it was confirmed that the local evaporation of carbon atoms due to oxidation appeared at the cathode side of the CNT structures under low current density, and the center area of CNT under high current density. Both types of damage morphologies induced by oxidation and EM were observed at the damaged CNT. The results showed the dominant damage mechanism alternated between oxidation and EM depending on current density under oxygen rich conditions.

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Exercise Stress Testing System

Compendium of Biomedical Instrumentation ◽

10.1002/9781119288190.ch149 ◽

2019 ◽

pp. 805-811

Keyword(s):

Stress Testing ◽

Exercise Stress ◽

Exercise Stress Testing ◽

Testing System

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Study on stress testing of ferromagnetic materials based on magnetic anisotropy

Insight - Non-Destructive Testing and Condition Monitoring ◽

10.1784/insi.2022.64.1.45 ◽

2022 ◽

Vol 64 (1) ◽

pp. 45-49

Author(s):

Ruilei Zhang ◽

Ziyang Gong ◽

Zhongchao Qiu ◽

Yuntian Teng ◽

Zhe Wang

Keyword(s):

Magnetic Anisotropy ◽

Stress Testing ◽

Processing System ◽

Ferromagnetic Materials ◽

Testing System ◽

Destructive Testing ◽

Signal Processing System ◽

System A ◽

Zn Ferrite ◽

Testing Experiment

The stress testing and evaluation of ferromagnetic materials that are widely applied in engineering has always been a focus of, and presented difficulties for, non-destructive testing. As there is still no effective method for detecting the stress of ferromagnetic materials, this paper puts forward the idea of applying the magnetic anisotropy method based on the inverse magnetostriction effect in stress testing of ferromagnetic materials. According to the principle of the magnetic anisotropy method, this paper discusses the development of Mn-Zn ferrite probes of three different structures, the construction of a magnetic anisotropy testing system comprising an excitation system, a signal collecting system and a signal processing system and the way in which a testing experiment was conducted on a 16MnR steel plate specimen under different conditions of stress, frequency and excitation voltage. All three types of probe can effectively determine the stress location of the specimen and present different phenomena and characteristics of the test. According to the experiment, significant correlation is seen between the stress and the magnetic signal, which provides a new idea for stress testing of ferromagnetic materials.

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Stress testing on silicon carbide electronic devices for prognostics and health management.

10.2172/1005076 ◽

2011 ◽

Cited By ~ 1

Author(s):

Robert James Kaplar ◽

Reinhard C. Brock ◽

Matthew Marinella ◽

Michael Patrick King ◽

Mark A. Smith ◽

...

Keyword(s):

Silicon Carbide ◽

Stress Testing ◽

Health Management ◽

Electronic Devices ◽

Prognostics And Health Management

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Kinetic Modeling of API Oxidation: 1. The AIBN/H2O/CH3OH Radical "Soup"

10.26434/chemrxiv.14368193.v1 ◽

2021 ◽

Author(s):

Alon Grinberg Dana ◽

Haoyang Wu ◽

Duminda Ranasinghe ◽

Frank C. Pickard IV ◽

Geoffrey P. F. Wood ◽

...

Keyword(s):

Kinetic Model ◽

Ab Initio ◽

Stress Testing ◽

Experimental Investigations ◽

Testing System ◽

Solvent Ratio ◽

Chemical Kinetic Model ◽

Alkoxyl Radical ◽

Acidic Conditions ◽

Ph Conditions

While different flavors of API stress testing systems have been used in experimental investigations for decades, the detailed kinetics of such systems as well as the chemical composition of prominent reactive species, specifically reactive oxygen species, are unknown. As a first step toward understanding and modeling API oxidation in stress testing, we investigated a typical radical "soup" solution an API is subject to during stress testing. Here we applied ab-initio electronic structure calculations to automatically generate and refine a detailed chemical kinetics model, taking a fresh look at API oxidation. We generated a detailed kinetic model for a representative azobisisobutyronitrile (AIBN)/H2O/CH3OH stress-testing system with varied co-solvent ratio (50%/50% -- 99.5%/0.5% vol. water/methanol) and for representative pH values (4--10) at 40oC stirred and open to the atmosphere. At acidic conditions hydroxymethyl alkoxyl is the dominant alkoxyl radical, and at basic conditions, for most studied initial methanol concentrations, cyanoisopropyl alkoxyl becomes the dominant alkoxyl radical, albeit at an overall lower concentration. At acidic conditions the levels of cyanoisopropyl peroxyl, hydroxymethyl peroxyl, and hydroperoxyl radicals are relatively high and comparable, while at both neutral and basic pH conditions, superoxide becomes the prominent radical in the system. The present work reveals the prominent species in a common model API stress testing system at various co-solvent and pH conditions, sets the stage for an in-depth quantitative API kinetic study, and demonstrates usage of novel software tools for automated chemical kinetic model generation and ab-initio refinement.

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Development of the Architecture of the System of High-Load Testing

NaUKMA Research Papers Computer Science ◽

10.18523/2617-3808.2021.4.88-92 ◽

2021 ◽

Vol 4 ◽

pp. 88-92

Author(s):

Lada Beniukh ◽

Andrii Hlybovets

Keyword(s):

Stress Testing ◽

Performance Testing ◽

High Load ◽

Modern Architecture ◽

Digital Systems ◽

Testing System ◽

Load Testing ◽

Critical Problems ◽

And Performance ◽

Increasing Load

Testing system performance and its importance at the same time is difficult to overestimate or underestimate. It would be much more correct to talk about the timeliness of this activity. Virtually any digital sys- tem built on modern approaches and technologies can work without any critical problems with its own performance. At the same time, for any system, especially when it becomes popular, it is very likely that there will be a time when it will not be able to cope with the ever-increasing load and become unstable. However, most companies that develop and maintain their own digital solutions – from websites to any other digital systems – often focus primarily on the functionality of the system and its compliance, rather than on the performance of the system as a whole. Such intentions are quite natural, because the system must properly perform the functions expected of it. When companies start to face performance problems, they try not to optimize the software as soon as possible, but to add more capacity – vertical and horizontal scaling. This strategy works, but it has limitations. After all, the addition of additional resources cannot be endless and sooner or later rests either on the architecture of the system, or in the capabilities of the company itself, and so on.Therefore it is recommended to carry out stress testing in advance, plan time and resources to have enough time to correct errors, and generally understand the boundaries of the system. At the same time, in order to organize full-fledged stress testing, trained specialists, tools and infrastructure are needed, especially when we are talking about heavy workload.As part of this work, an analysis of various tools for the implementation of stress testing and performance testing, scaling of such tests and centralized reporting of metrics. As a result, approaches and principles for the construction of a modern architecture for the implementation of the load testing subsystem in the continuous supply of code were proposed.

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Srovnání ekonomiky běhu na základě příjmu kyslíku u vytrvalostních běžců na asfaltu, škváře a tartanu

Studia sportiva ◽

10.5817/sts2014-2-5 ◽

2014 ◽

Vol 8 (2) ◽

pp. 46-52

Author(s):

Jaroslava Chovancová ◽

Martina Bernaciková ◽

Jan Novotný ◽

Tomáš Kalina ◽

Miriam Kalichová

Keyword(s):

Oxygen Consumption ◽

Oxygen Uptake ◽

Body Mass ◽

Stress Testing ◽

Running Economy ◽

Testing System ◽

Distance Runners ◽

Long Distance ◽

Post Hoc ◽

Energetic Aspect

The purpose of this study was to compare running economy (by oxygen consumption) in long distance runners on three different surfaces (asphalt, cinder and tartan). Thirty Czech long distance runners (age: 25.1±4.3 years, height: 183.2±7.4 cm, body mass: 72.4±6.0 kg, BMI: 22.5±1.4 and VO2 max: 65.8±5.2 ml∙min∙kg-1) participated in this study. We measured oxygen uptake by wireless, portable cardiopulmonary stress testing system (Oxygen Mobile, Viasys) on each surface during running at speeds: 10, 12, 14 and 16 km∙h-1. Differences of oxygen uptake were assessed statistically using parametric ANOVA and post-hoc Tukey HSD test. We found significant differences between asphalt and cinder for 12, 14 and 16 km∙h-1. Differences of average values of oxygen uptake on tartan at 10 km∙h-1:35.2±2.8 ml∙min∙kg-1; 12 km∙h-1: 41.0±3.4 ml∙min∙kg-1; 14 km∙h-1: 47.8±4.2 ml∙min∙kg-1a 16 km∙h-1: 54.2±4.9 ml∙min∙kg-1; on cinder at 10 km∙h-1: 36.2±3.6 ml∙min∙kg-1; 12 km∙h-1: 42.5±3.9 ml∙min∙kg-1; 14 km∙h-1: 49.5±5.4 ml∙min∙kg-1a 16 km∙h-1: 56.1±6.8 ml∙min∙kg-1 and on asphalt at 10 km∙h-1: 35.0±3.7 ml∙min∙- kg-1; 12 km∙h-1: 39.8±4.0 ml∙min∙kg-1; 14 km∙h-1: 46.3±5.1 ml∙min∙kg-1a 16 km∙h-1 : 53.5±4.8 ml∙min∙kg-1. The lowest values of oxygen uptake were found on asphalt surface. The asphalt is probably the most favorable surface according to energetic aspect.

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