PV Module Technology and Reliability – Status and Perspectives

Green ◽  
2012 ◽  
Vol 2 (4) ◽  
Author(s):  
Wirth Harry ◽  
Ferrara Claudio
Keyword(s):  
Accelerated Aging ◽  
Stress Factors ◽  
Test Results ◽  
Certification Testing ◽  
Pv Module ◽  
Type Approval ◽  
Laboratory Results ◽  
The Common ◽  
Module Efficiency ◽  
Product Costs

AbstractSolar cell processing into modules is mostly responsible for the product's reliability, has a severe impact on product costs and controls 10–15% of its efficiency. This article gives an overview on current module technology and highlights innovative approaches to reduce material cost and increase module efficiency. High potential approaches like back contact technology are those that simultaneously address cell and module technology to offer efficiency gains in the range of 10%.Module reliability expectations of 25 years or more require quality assurance beyond the common type approval standards. In its second part, the article addresses stress factors for PV modules. To ensure fast innovation cycles, accelerated aging tests are used to reproduce these stress factors in the laboratory. Results from certification testing are discussed as well as new approaches for improved testing. More realistic test results can be obtained by simulating combinations of stress factors.

scholarly journals Effect of Backsheet Properties on PV Encapsulant Degradation during Combined Accelerated Aging Tests

2020 ◽  
Vol 12 (12) ◽  
pp. 5208
Author(s):  
Djamel Eddine Mansour ◽  
Chiara Barretta ◽  
Luciana Pitta Bauermann ◽  
Gernot Oreski ◽  
Andreas Schueler ◽  
...  
Keyword(s):  
Transmission Rate ◽  
Heat Exposure ◽  
Accelerated Aging ◽  
Chemical Characterization ◽  
Ethylene Vinyl Acetate ◽  
Stress Factors ◽  
Oxygen Transmission Rate ◽  
Pv Module ◽  
Permeation Properties

Long-term photovoltaic (PV) module reliability is highly determined by the durability of the polymeric components (backsheet and encapsulation materials). This paper presents the result of experiments on encapsulant degradation influenced by the backsheet permeation properties. Towards this goal, one type of ethylene/vinyl acetate copolymer (EVA) was aged in glass/EVA/backsheet laminates in accelerated aging tests (up to 4000 h for Damp-Heat (DH) and up to 480 kWh/m2 for UV and UV-DH combined). The samples contained three backsheets with different permeation properties to examine their impact on EVA degradation. Thermal and chemical characterization shows that the EVA degradation is stronger with the glass–EVA–polyamide (PA)-based backsheet than with the polyethylene terephthalate (PET)-based backsheets. The higher oxygen transmission rate (OTR) of the PA-based backsheet may increase photo-oxidation and aggravating the degradation of EVA in the laminates. Furthermore, FTIR results were used to demonstrate the effect of damp heat exposure on the EVA interfaces, showing an accelerated degradation at the glass–EVA interface. The comparison of accelerated aging stress factors reveals that EVA suffers the strongest chemical and optical degradation when high UV, high temperature and high relative humidity are combined simultaneously.

Accelerated aging of the brain transcriptome by the common chemotherapeutic doxorubicin

2021 ◽  
pp. 111451
Author(s):  
Alyssa N. Cavalier ◽  
Zachary S. Clayton ◽  
David A. Hutton ◽  
Devin Wahl ◽  
Julie A. Reisz ◽  
...  
Keyword(s):  
Accelerated Aging ◽  
Brain Transcriptome ◽  
The Common ◽  
The Brain

scholarly journals Utilisation of laboratory test results for patient management by clinicians at two large referral hospitals in Zambia

2020 ◽  
Author(s):  
Sabe Mwape ◽  
Victor Daka ◽  
Scott Matafwali ◽  
Kapambwe Mwape ◽  
Jay Sikalima ◽  
...  
Keyword(s):  
Teaching Hospital ◽  
Laboratory Tests ◽  
Patient Management ◽  
Medical Laboratory ◽  
Test Results ◽  
Cross Sectional ◽  
Childrens Hospital ◽  
Laboratory Test Results ◽  
Laboratory Results ◽  
Referral Hospitals

Background Medical laboratory diagnosis is a critical component of patient management in the healthcare setup. Despite the availability of laboratory tests, clinicians may not utilise them to make clinical decisions. We investigated utilsation of laboratory tests for patient management among clinicians at Ndola Teaching Hospital (NTH) and Arthur Davison Childrens Hospital (ADCH), two large referral hospitals in the Copperbelt Province, Ndola, Zambia. Method We conducted a descriptive cross-sectional study among clinicians. The study deployed self-administered questionnaires to evaluate clinician utilisation, querying and confidence in laboratory results. Additional data on demographics and possible laboratory improvements were also obtained. Data were entered in Microsoft excel and exported to SPSS version 16 for statistical analysis. Results Of the 80 clinicians interviewed, 96.2% (77) reported using laboratory tests and their results in patient management. 77.5% (62) of the clinicians indicated they always used laboratory results to influence their patient management decisions. Of the selected laboratory tests, clinicians were more confident in using haemoglobin test results (91.2%). There was no statistically significant association between the clinicians gender or qualification and use of test results in patient management. Conclusion Our findings show that despite the majority querying laboratory results, most of the clinicians use laboratory results for patient management. There is need for interactions between the laboratory and clinical area to assure clinician confidence in laboratory results. Key words: utilisation, clinicians, laboratory tests, Ndola Teaching Hospital, Arthur Davison Childrens Hospital

scholarly journals Knowledge and attitudes of Saudi medical laboratory professionals concerning non-pathological factors influencing test results

2021 ◽  
Vol 3 (3) ◽  
pp. 234-240
Author(s):  
Mohammed Makkawi ◽  
Keyword(s):  
Health Management ◽  
Healthcare Services ◽  
Medical Laboratory ◽  
Test Results ◽  
Medical Decisions ◽  
Knowledge And Attitudes ◽  
Laboratory Test Results ◽  
Laboratory Results ◽  
Patient Health ◽  
Medical Laboratory Professionals

Introduction: Successful medical decisions are highly reliant on medical laboratory results; as such, laboratory results are essential to patient health management, and errors in those results may lead to serious complications and death. The aim of the present study was to assess the knowledge of medical laboratory practitioners in Saudi Arabia regarding factors that may influence medical laboratory testing results and the correct actions for troubleshooting. Methods: A total of 256 practitioners participated, representing diverse qualifications and various healthcare sectors. The study utilized a pretested questionnaire comprised of three sections: socio-demographic characteristics, knowledge, and attitudes. Results: The responses demonstrated participants to possess outstanding knowledge of factors that may affect laboratory test results, including biological and pathological factors, diet, and personal habits. Furthermore, participants demonstrated satisfactory attitudes toward such factors. Conclusions: Thus, this study reveals a magnificent image concerning Saudi practitioners’ knowledge and capacity for suitable actions given unexpected test results, and hence their ability to provide correct healthcare services. This constitutes an acceptable overview, particularly as a first pass; nonetheless, more studies on larger cohorts remain required.

scholarly journals Adherence and its impact on the reduction of lipid peril of patients seen in the form of telemedicine at a state university in Costa Rica

2015 ◽  
Vol 7 (2) ◽  
pp. 137-142
Author(s):  
Karla Rojas Suárez ◽  
Lourdes Rojas Espinoza
Keyword(s):  
Cardiovascular Disease ◽  
Costa Rica ◽  
Total Cholesterol ◽  
Age Groups ◽  
Costa Rican ◽  
State University ◽  
Test Results ◽  
Adherence To Treatment ◽  
Cholesterol Levels ◽  
Laboratory Results

Cardiovascular disease is the leading cause of morbidity and mortality worldwide. Costa Rica is no exception, with high levels of cholesterol and triglycerides in all age groups, and lack of adherence to treatment as one of the main challenges. We analyze the variation in test results of lipid pro le in one control and one telemedicine group in the staff of a Costa Rican university. We followed 62 patients aged 20-70 years, with tests done after fasting 12 hours, and 6 months to a year between samples. A questionnaire was used to calculate rates of factors that affect the variation in laboratory results. The patients had greater commitment to self care in the telemedicine group, achieving a reduction in total cholesterol levels, with little or no variation in other lipoproteins, and a slight increase in triglyceride levels.

Plasma Surface Alloying W-Mo Low-Alloy HSS

2005 ◽  
Vol 475-479 ◽  
pp. 3955-3958
Author(s):  
Jin Yong Xu ◽  
Yan Ping Liu ◽  
Yuan Gao ◽  
Zhong Xu
Keyword(s):  
High Speed ◽  
Surface Hardness ◽  
High Speed Steel ◽  
Alloying Elements ◽  
Work Piece ◽  
Test Results ◽  
Surface Alloying ◽  
Plasma Surface ◽  
The Common ◽  
Plasma Surface Alloying

The plasma surface alloying low-alloy high speed steel (HSS) is carried out in vacuum chamber where a source electrode (W-Mo) and a work piece are properly placed. By using the sputter of glow-discharge, under the common function of electric field and temperature field, ?????? the desired alloying elements (W- Mo) are sputtered from the source cathode, traveling toward the substrate. Subsequently the alloying elements deposit onto the surface of the substrate, forming alloy diffusion layer which the depth may vary from several micron to several hundreds micron. In the end a surface low-alloy HSS steel would be produced after ultra-saturation ion carbonization. The composition of the alloyed layer is equal or similar with it of low-alloy HSS. The carbonized layer, without coarse eutectic ledeburite structure, possesses high density of finely and dispersed alloy carbides with tungsten equivalent 10% above and a significant improvement in surface hardness and wear resistance. The principle of plasma surface alloying and its test results and commercial products application are introduced in this paper.

IMPLEMENTATION OF MULTIPLE-CHANNEL CAPACITIVE ECG MEASUREMENT BASED ON CONDUCTIVE FABRIC

2013 ◽  
Vol 25 (06) ◽  
pp. 1350052 ◽  
Author(s):  
Yue-Der Lin ◽  
Ya-Hsuech Chien ◽  
Shih-Fan Wang ◽  
Cheng-Lun Tsai ◽  
Hen-Hong Chang ◽  
...  
Keyword(s):  
Circuit Diagram ◽  
Test Results ◽  
Theoretic Analysis ◽  
Multiple Channel ◽  
Conductive Fabric ◽  
The Subject ◽  
The Common ◽  
Power Line Interference ◽  
Electrocardiogram Ecg

Capacitive electrocardiogram (cECG) measurement is an attractive approach for long-term health monitoring. However, there is little literature available for the implementation of multiple-channel cECG system in standard limb leads. The circuit diagram for such a system is also rarely available in literature. This paper presents a multiple-channel limb-lead cECG system that utilized conductive fabrics as the capacitive sensors. The design criteria and the corresponding circuit diagram are described in detail. The proposed system also incorporates the capacitive driven-body (CDB) circuit to reduce the common-mode power-line interference (PLI). The presented system is verified to be stable by theoretic analysis and long-term experiments. The signals acquired by the presented system are competitive with those by commercially available electrocardiogram (ECG) machines. The feasible size and distance to the subject for the sensor made by conductive fabric have also been evaluated by a series of tests. From the test results, the sensor is suggested to be of greater than 60 cm2 in area and not more than 3 mm in distance for cECG measurement.

Herbal Remedies: Effects on Clinical Laboratory Tests

2006 ◽  
Vol 130 (4) ◽  
pp. 521-528 ◽  
Author(s):  
Amitava Dasgupta ◽  
David W. Bernard
Keyword(s):  
Chinese Medicine ◽  
Laboratory Test ◽  
Alternative Medicine ◽  
Clinical Laboratory ◽  
Herbal Remedies ◽  
Test Results ◽  
Abnormal Laboratory ◽  
St John's Wort ◽  
Laboratory Test Results ◽  
Laboratory Results

AbstractContext.—Complementary and alternative medicine (herbal medicines) can affect laboratory test results by several mechanisms.Objective.—In this review, published reports on effects of herbal remedies on abnormal laboratory test results are summarized and commented on.Data Sources.—All published reports between 1980 and 2005 with the key words herbal remedies or alternative medicine and clinical laboratory test, clinical chemistry test, or drug-herb interaction were searched through Medline. The authors' own publications were also included. Important results were then synthesized.Data Synthesis.—Falsely elevated or falsely lowered digoxin levels may be encountered in a patient taking digoxin and the Chinese medicine Chan Su or Dan Shen, owing to direct interference of a component of Chinese medicine with the antibody used in an immunoassay. St John's wort, a popular herbal antidepressant, increases clearance of many drugs, and abnormally low cyclosporine, digoxin, theophylline, or protease inhibitor concentrations may be observed in a patient taking any of these drugs in combination with St John's wort. Abnormal laboratory results may also be encountered owing to altered pathophysiology. Kava-kava, chaparral, and germander cause liver toxicity, and elevated alanine aminotransferase, aspartate aminotransferase, and bilirubin concentrations may be observed in a healthy individual taking such herbal products. An herbal product may be contaminated with a Western drug, and an unexpected drug level (such as phenytoin in a patient who never took phenytoin but took a Chinese herb) may confuse the laboratory staff and the clinician.Conclusions.—Use of alternative medicines may significantly alter laboratory results, and communication among pathologists, clinical laboratory scientists, and physicians providing care to the patient is important in interpreting these results.

scholarly journals Accelerated Aging Characterization of Lithium-ion Cells: Using Sensitivity Analysis to Identify the Stress Factors Relevant to Cyclic Aging

Batteries ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. 6 ◽  
Author(s):  
Tanja Gewald ◽  
Adrian Candussio ◽  
Leo Wildfeuer ◽  
Dirk Lehmkuhl ◽  
Alexander Hahn ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Accelerated Aging ◽  
Lithium Ion ◽  
Simulation Models ◽  
Cell Types ◽  
Stress Factors ◽  
Worst Case ◽  
Lithium Ion Cells ◽  
Aging Models ◽  
Semi Empirical

As storage technology in electric vehicles, lithium-ion cells are subject to a continuous aging process during their service life that, in the worst case, can lead to a premature system failure. Battery manufacturers thus have an interest in the aging prediction during the early design phase, for which semi-empirical aging models are often used. The progress of aging is dependent on the application-specific load profile, more precisely on the aging-relevant stress factors. Still, a literature review reveals a controversy on the aging-relevant stress factors to use as input parameters for the simulation models. It shows that, at present, a systematic and efficient procedure for stress factor selection is missing, as the aging characteristic is cell-specific. In this study, an accelerated sensitivity analysis as a prior step to aging modeling is proposed, which is transferable and allows to determine the actual aging-relevant stress factors for a specific lithium-ion cell. For the assessment of this accelerated approach, two test series with different acceleration levels and cell types are performed and evaluated. The results show that a certain amount of charge throughput, 100 equivalent full cycles in this case, is necessary to conduct a statistically significant sensitivity analysis.

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