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Advancing perovskite photovoltaics for space:critical stability testing guidelines 认领 引用
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作者 Yifan Zheng Guodong Zhang +4 位作者 Zicai Shen Jianhui Bin Deying Luo Rui Zhu Yuchuan Shao 《Advanced Photonics》 SCIE EI CAS CSCD 2025年第3期7-13,共7页
1 Introduction The explosive growth of the global commercial space industry has brought low-Earth orbit(LEO)satellite constellation programs,such as Starlink and Qianfan,to a pivotal stage in the evolution of space de... 1 Introduction The explosive growth of the global commercial space industry has brought low-Earth orbit(LEO)satellite constellation programs,such as Starlink and Qianfan,to a pivotal stage in the evolution of space development toward commercialization.1 Traditional space missions have stringent requirements for mission risk and payload mass,while commercial satellite design emphasizes economic viability.2 This systemic transformation has not only redefined the operational framework of aerospace engineering but also opened critical pathways for the spatial application of emerging photovoltaic technologies.Perovskite solar cells(PSCs),endowed with high specific power and cost-effectiveness,have demonstrated competitive potential against silicon-based counterparts in terrestrial applications.3 Crucially,their application prospects are particularly promising in the space domain,where device mass,power density,and cost efficiency are critical design constraints. 展开更多
关键词 commercial satellite systemic transformation space development space application commercial space industry aerospace engineering perovskite solar cells stability testing
Current practices and future directions of stability testing in parenteral nutrition:A scoping review 认领 引用
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作者 Nur Aina Abu Hassan Shaari Birinder Kaur Sadu Singh +1 位作者 Mohd Makmor-Bakry Chandini Menon Premakumar 《Asia Pacific Journal of Clinical Nutrition》 SCIE CAS CSCD 2025年第6期885-896,共12页
Background and Objectives:Parenteral nutrition(PN)provides nutrition intravenously,often as two-in-one(TIO)or all-in-one(AIO)solutions.These solutions are complex,containing around 50 chemical components,which can aff... Background and Objectives:Parenteral nutrition(PN)provides nutrition intravenously,often as two-in-one(TIO)or all-in-one(AIO)solutions.These solutions are complex,containing around 50 chemical components,which can affect the admixture stability.While there is substantial data on stability tests for PN solutions,the methodologies and acceptance criteria are not well-defined in current literature.This scoping review aimed to identify and summarise the current tests and methods used to assess the stability of AIO solutions in hospital settings.Methods and Study Design:Comprehensive searches on stability tests and parenteral nutrition were conducted in Web of Science(WoS),PubMed,and Scopus on 11 January 2024,updated on 4 April 2025.Searches were limited to articles published in English from January 2010 to March 2025.Data extraction was done on the included studies for descriptive analysis.Results:33 articles met the inclusion criteria,25 focused on AIO solutions,six included both AIO and TIO,and one was on lipid emulsion only.Eleven stability tests were identified and classified into physical,chemical,and microbiological categories.The suggested core set of tests for assessing AIO solution stability includes visual inspection,pH measurement,particle size distribution using dynamic light scattering and light obstruction,zeta potential measurement,lipid peroxidation using the thiobarbituric acid reactive substances(TBARS)assay,and sterility testing via membrane filtration.Conclusions:This review identifies a suggested core set of stability tests essential for evaluating AIO solutions in hospital settings.Adoption of these standardised methods can enhance the reliability and consistency of stability assessments. 展开更多
关键词 stability tests parenteral nutrition parenteral nutrition solutions all-in-one solutions lipid emulsions
Velocity plus displacement equivalent force control for real-time substructure testing 认领 引用 被引量：3
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作者 Zhou Huimeng D.Wagg Wang Tao 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2018年第1期87-102,共16页
This paper employs a velocity plus displacement（V＋D）-based equivalent force control（EFC） method to solve the velocity/displacement difference equation in a real-time substructure test. This method uses type 2 fee... This paper employs a velocity plus displacement（V＋D）-based equivalent force control（EFC） method to solve the velocity/displacement difference equation in a real-time substructure test. This method uses type 2 feedback control loops to replace mathematical iteration to solve the nonlinear dynamic equation. A spectral radius analysis of the amplification matrix shows that the type 2 EFC-explicit, Newmark-β method has beneficial numerical characteristics for this method. Its stability limit of Ω = 2 remains unchanged regardless of the system damping because the velocity is achieved with very high accuracy during simulation. In contrast, the stability limits of the central difference method using direct velocity prediction and the EFC-average acceleration method with linear interpolation are shown to decrease with an increase in system damping. In fact, the EFC-average acceleration method is shown to change from unconditionally stable to conditionally stable. We also show that if an over-damped system with a damping ratio of 1.05 is considered, the stability limit is reduced to Ω =1.45. Finally, the results from an experiment with a single-degree-of-freedom structure installed with a magneto-rheological（MR） damper are presented. The results demonstrate that the proposed method is able to follow both displacement and velocity commands with moderate accuracy, resulting in improved test performance and accuracy for structures that are sensitive to both velocity and displacement inputs. Although the findings of the study are promising, additional test data and several further improvements will be required to draw general conclusions. 展开更多
关键词 real-time substructure test EFC velocity/displacement control newmark-β method stability
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Two-dimensional Hurwitz-Schur stability test of linear systems with interval delays 认领 引用
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作者 Qina Gao Ying Zhu Yang Xiao 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2013年第4期666-673,共8页
It is difficult to determine the stability of linear systems with interval delays （LID systems） because the roots of the characteristic polynomials of the systems are continuous and vary in a complex plane with the ... It is difficult to determine the stability of linear systems with interval delays （LID systems） because the roots of the characteristic polynomials of the systems are continuous and vary in a complex plane with the delay. To solve the problem, this paper develops a stability test of LID systems by resorting to 2-D hybrid polynomials and 2-D Hurwitz-Schur stability. Comparing with the existing test approaches for LID systems, the proposed 2-D Hurwitz-Schur stability test is easy to apply, and can obtain closed form constraint conditions for system parameters. This paper proposes some theorems as sufficient conditions for the stability of LID systems, and also reveals that recent results about the stability test of linear systems with any delays （LAD systems） are not suitable for LID systems because they are very conservative for the stability of LID systems. 展开更多
关键词 time-delay system quasipolynomial stability test 2-D Hurwitz-Schur stability.
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A new nonparametric stability test with an application to major Chinese macroeconomic time series 认领 引用
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作者 CAI Nan CAI Zong-wu FANG Ying 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2013年第1期1-16,共16页
In this paper, we propose a new test for testing the stability in macroeconomic time series, based on the LASSO variable selection approach and nonparametric estimation of a time-varying model. The wild bootstrap is e... In this paper, we propose a new test for testing the stability in macroeconomic time series, based on the LASSO variable selection approach and nonparametric estimation of a time-varying model. The wild bootstrap is employed to obtain its data-dependent critical values. We apply the new method to test the stability of bivariate relations among 92 major Chinese macroeconomic time series. We find that more than 70% bivariate relations are significantly unstable. 展开更多
关键词 LASSO stability test time-varying coefficients model wild bootstrap.
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Formulation of a hydrating cream containing Echinacea extract as a preservative and antimicrobial agent 认领 引用
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作者 Zahra Mirzapour Zahra Zaregheshlaghi +1 位作者 Ebrahim Soleiman Dehkordi Modarres Dehghani 《Journal of Dermatologic Science and Cosmetic Technology》 2025年第4期52-59,共8页
Objective:The purpose of this article is to investigate the performance of Echinacea extract as a preservative and antimicrobial agent in a hydrating cream.Methods:The hydrating cream was prepared by mixing the oil an... Objective:The purpose of this article is to investigate the performance of Echinacea extract as a preservative and antimicrobial agent in a hydrating cream.Methods:The hydrating cream was prepared by mixing the oil and water phases at a temperature of 75±2℃.Then,physicochemical and microbial analyses were performed on the prepared cream using different devices.Results:For proper evaluation and a more detailed examination of the prepared cream,each experiment was performed three times(n≥3),and the average data are reported.The results of the prepared cream indicate that it has a high skin absorption capacity,and the Echinacea extract has given it antimicrobial properties.Other advantages of making this hydrating cream include high hydration to human skin,formulation stability,and a long-lasting effect without creating a two-phase state.Conclusion:Creams have been evaluated as a primary component of cosmetic products as topical preparations from time immemorial due to their ease of use and removal from the skin.In this article,we report the formulation of a hydrating cream using various ingredients.The results obtained from this article demonstrate that this extract can maintain its properties under accelerated stability conditions for 6 months.Also,the prepared cream can eliminate bacteria over 28 days in an effective antimicrobial preservative test. 展开更多
关键词 Cosmetics Hydrating cream Stability testing Formulation development Echinacea extract Antimicrobial efficacy Natural preservative
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Fabrication and application of UV-stimulated sustained-release composite fibrous membrane by electrospinning technology 认领 引用
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作者 Yayan Mao Xue Zhao Xinglian Xu 《Food Materials Research》 CAS 2025年第1期158-165,共8页
As an emerging technology,electrospinning can effectively encapsulate active compounds for active packaging.Notably,stimulating the release of active ingredients by photostimulation is conducive to improving their bio... As an emerging technology,electrospinning can effectively encapsulate active compounds for active packaging.Notably,stimulating the release of active ingredients by photostimulation is conducive to improving their bioavailability during food packaging and accurately playing the role of preservation.This study prepared an oregano essential oil emulsion using gelatin-gum arabic as a compound emulsifier with zinc oxide nanoparticles(ZnO NPs).The emulsion stability test identified 20%and 25%(w/v)gelatin-gum arabic solutions as optimal for electrospinning.On this basis,gelatin served as the film-forming substrate,incorporating the emulsion to produce composite fibrous membranes via electrospinning.The membranes were then exposed to ultraviolet C(UVC)radiation for 0 h and 4 h.Results revealed that UV irradiation activated ZnO NPs,generating reactive oxygen species that disrupted the emulsion interface and fiber structure,facilitating essential oil release.Additionally,UV treatment enhanced the membrane's antioxidant capacity,with DPPH radical scavenging showing sustained release over 4 d.Applied to chilled chicken breast packaging,the UV-stimulated membrane significantly reduced microbial counts by day 6 at 4℃,demonstrating the potential for chilled meat preservation.These findings offer insights for developing UV-stimulated active packaging systems. 展开更多
关键词 active packagingnotablystimulating release active ingredients UV stimulated food packaging oregano essential oil emulsion encapsulate active compounds compound emulsifier emulsion stability test sustained release
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Methane dehydroaromatization with periodic CH_4-H_2 switch:A promising process for aromatics and hydrogen 认领 引用 被引量：9
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作者 Changyong Sun Guangzong Fang +7 位作者 Xiaoguang Guo Yuanli Hu Shuqi Ma Tianhua Yang Jie Han Hao Ma Dali Tan Xinhe Bao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第3期257-263,共7页
Long-term stability test of Mo/HZSM-5-N catalysts（HZSM-5-N stands for nano-sized HZSM-5） in methane dehydroaromatization（MDA）reaction has been performed with periodic CH4-H2 switch at 1033-1073 K for more than 100... Long-term stability test of Mo/HZSM-5-N catalysts（HZSM-5-N stands for nano-sized HZSM-5） in methane dehydroaromatization（MDA）reaction has been performed with periodic CH4-H2 switch at 1033-1073 K for more than 1000 h.During this test,methane conversion ranges from 13% to 16%,and mean yield to aromatics（i.e.benzene and naphthalene） exceeds 10%.N2-physisorption,XRD,NMR and TPO measurements were performed for the used Mo/HZSM-5 catalysts and coke deposition,and the results revealed that the periodic hydrogenation can effectively suppress coke deposition by removing the inert aromatic-type coke,thus ensuring Mo/HZSM-5 partly maintained its activity even in the presence of large amount of coke deposition.The effect of zeolite particle size on the catalytic activity was also explored,and the results showed that the nano-sized zeolite with low diffusion resistance performed better.It is recognized that the size effect was enhanced by reaction time,and it became more remarkable in a long-term MDA reaction even at a low space velocity. 展开更多
关键词 methane dehydroaromatization（MDA） periodic CH4-H2switch long-term stability test coke deposition regeneration
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Hydrothermal synthesis and characterization of Dy-doped CeVO4 nanorods used for photodegradation of methylene blue and rhodamine B 认领 引用
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作者 Anukorn Phuruangrat Titipun Thongtem SomchaiThongtem 《Journal of Rare Earths》 SCIE EI CAS CSCD 2021年第10期1211-1216,I0002,共6页
Pure CeVO4 and Dy-doped CeVO4 nanorods containing different weight contents of Dy dopant were synthesized by hydrothermal method.Effect of Dy dopant on photodegradation of methylene blue(MB)and rhodamine B(RhB) ... Pure CeVO4 and Dy-doped CeVO4 nanorods containing different weight contents of Dy dopant were synthesized by hydrothermal method.Effect of Dy dopant on photodegradation of methylene blue(MB)and rhodamine B(RhB) was evaluated under UV light irradiation within 80 min.Pure CeVO4 and Dydoped CeVO4 nanorods were characterized by X-ray diffraction(XRD),Raman spectroscopy,transmission electron microscopy(TEM) and UV-visible spectroscopy.In this research,CeVO4 nanorods are tetragonal phase with the detection of main peak shift after being doped with Dy.The length of nanorods is deceased from 50 to 200 nm for pure CeVO4 to 50-100 nm for 3% Dy-doped CeVO4.Photodegradation of MB and RhB by CeVO4 nanorods under UV light irradiation is improved by Dy-dopant that plays the role in accepting electrons and reducing electron-hole recombination.MB and RhB solutions degraded by 3% Dy-doped CeVO4 nanorods was 94% and 93% within 80 min,respectively. 展开更多
关键词 Dy-doped CeVO4 nanorods Photocatalysis Spectroscopy Radical trapping test Photocatalytic stability test Rare earths
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Experimental study of pavement performance of basalt fiber-modified asphalt mixture 认领 引用 被引量：27
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作者 范文孝 康海贵 郑元勋 《Journal of Southeast University(English Edition)》 EI CAS 2010年第4期614-617,共4页
To discuss the pavement performance of basalt fiber-modified asphalt mixtures,the optimum dosages of asphalt and fibers are studied by the Marshall test and the rutting test.The results demonstrate that the optimum do... To discuss the pavement performance of basalt fiber-modified asphalt mixtures,the optimum dosages of asphalt and fibers are studied by the Marshall test and the rutting test.The results demonstrate that the optimum dosages of asphalt and fibers are 4.63% and 0.3%,respectively.Then the pavement performances of basalt（polyester,xylogen）fiber-modified asphalt mixtures are investigated through high temperature stability tests,water stability tests and low temperature crack resistance tests.It indicates that the pavement performances of the fiber-modified asphalt mixtures such as rutting dynamic stability,freezing splitting tensile strength,low temperature crack resistance and so on are improved compared with control asphalt mixture.The results show that the pavement performances of asphalt mixtures can be improved by fiber-modifiers.Besides,the improvement effects of basalt fiber are superior to polyester fiber and xylogen fiber. 展开更多
关键词 asphalt mixture basalt fiber Marshall test high temperature stability test pavement performance
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Preliminary characterization in antimicrobial stability, phytochemical and toxicity profiling of Sauropus androgynus L. (sweet leaf vegetable) extract: Evaluate the potential of new antimicrobial agent 认领 引用
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作者 Jun Xian Wong Yaya Rukayadi +3 位作者 Nur Hanani Zainal Abedin Noor Azira Abdul Mutalib Suzita Ramli Chee Hao Kuan 《Food Bioscience》 SCIE 2025年第1期1212-1227,共16页
Chemical preservatives are well-recognized in food preservation,however,overuse may cause adverse effects on consumer health.Therefore,researchers prompted their contribution to develop plant-based preservatives,which... Chemical preservatives are well-recognized in food preservation,however,overuse may cause adverse effects on consumer health.Therefore,researchers prompted their contribution to develop plant-based preservatives,which have become promising alternative candidates.This research sought to characterize the antimicrobial activity,toxicity and phytochemical analyses of ethanolic extract of Sauropus androgynus(EESA).The tested strains were mainly foodborne pathogens and spoilage microbes,inhibited in agar well diffusion(7.00-9.33 mm of inhibition zones).Minimum inhibition concentration(MIC;1.56-50.00 mg/mL),minimum bactericidal concentration(MBC;1.56-50.00 mg/mL)and minimum fungicidal concentration(MFC;3.13-50.00 mg/mL)were recorded as well.Time-kill analysis showed microorganisms were killed completely at 2-4×MIC except Bacillus cereus and Candida parapsilosis but below the required infectious doses(1 mg/mL).In conclusion,EESA(100 mg/mL)potentially inhibited all tested microbes provided without compromising its stability.EESA can potentially to be directed and incorporated into the confirmation of future food applications. 展开更多
关键词 Antimicrobial Phytochemical profiling Stability test Sauropus androgynus L. Toxicity analysis
Technological Valorization of Algerian Dates Downgraded from Deglet NourVariety to Semi-Candied Dates in Dates Syrup 认领 引用
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作者 Férial Aziza Benyahia-Krid Elheyfa Khemissat +4 位作者 O. Aissaoui Zitoun Kaouther Djafri Meriem Bergouia Batoul Meghzili Lamia El-Mechta 《Food and Nutrition Sciences》 CAS 2021年第6期627-642,共16页
The objective of this study is the valorization of downgraded dates from a high Algerian date variety Deglet Nour, locally called “h’chef”. The work starts with the implementation of a food formulation of semi-cand... The objective of this study is the valorization of downgraded dates from a high Algerian date variety Deglet Nour, locally called “h’chef”. The work starts with the implementation of a food formulation of semi-candied dates in syrup extracted from dates. This formulation was based on dehydration-impregnation by immersion (D.I.I.). The downgraded dates were cleaned, cut, blanched, and then immersed in date syrups with increasing differential concentrations in Brix degrees: 65°, 70° and 75°. The chosen date/syrup immersion ratio is 1:2 (w/w). The obtained semi-candied dates were the subject of physicochemical and sensory analyses. The characterization of the downgraded dates before immersion showed high sugar content with a rate 52.67 g% g of dry matter and low water content (14%) which favors their use in semi-candied products. The physico-chemical analyses results of the three semi-candied dates products show an increase in their final sugar content, i.e. from 53.55% to 60.78% and in ashes between 1.76 p.cent and 1.94 p.cent. On the other hand, sensory analysis results confirm that the semi-candied dates with a syrup of 75° Brix present the most appreciated and preferable organoleptic characteristics than the other variables. Finally, following appertisation, the stability test reveals good microbiological quality (100°C for 20 minutes) of the three (3) semi-candied formulations of dates. Thus, the valorization of the “h’chef” as sorting gap Deglet Nour date allowed its transformation into semi-candied dates, stable, appreciable on the organoleptic side. This new formulation could constitute a value-added product if eventually manufactured on an industrial scale, mainly in southern Algeria. 展开更多
关键词 Phoenix dactylifera L. Downgraded Dates Food Formulation Osmotic Dehydration Stability Test
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Health: An Engine of Economic Growth 认领 引用
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作者 Bamadev Paudel 《China-USA Business Review》 2011年第12期1361-1370,共10页
Earlier studies have shown that human capital is one of the major determinants of economic growth. Human capital includes not only enhancement of knowledge and skill through education and training but also improvement... Earlier studies have shown that human capital is one of the major determinants of economic growth. Human capital includes not only enhancement of knowledge and skill through education and training but also improvement in a person＇s health conditions. Health is therefore regarded as a significant determining factor for a country＇s prosperity. There are plenty of researches that studied the link between human capital and economic growth but very few researches have examined the role of health condition of a country on economic growth. Unlike previous studies, this study applies recent econometric techniques to explore the relationship between major health indicators and growth performance in 30 OECD countries. The Generalized Method of Moments （GMM） and panel data estimation techniques are used to obtain the empirical results. The estimated results confirm that there is a significant relationship between health indicators and economic growth in OECD countries. The robustness of the results was also tested by conducting Chow＇s stability and Granger＇s causality tests. The stability test shows that the relationship does not hold stable for entire sample period. The causality test, on the other hand, does not support much for the bidirectional relationship between economic growth and health but indicates that the causality mostly goes from health to economic prosperity . 展开更多
关键词 health expenditure life expectancy economic growth GMM estimation panel data estimation causality test stability test
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Two isomeric In(Ⅲ)-MOFs:unexpected stability difference and selective fluorescence detection of fluoroquinolone antibiotics in water 认领 引用 被引量：17
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作者 Wen-Bin Zhong Ru-Xia Li +5 位作者 Jie Lv Tao He Ming-Ming Xu Bin Wang Lin-Hua Xie Jian-Rong Li 《Inorganic Chemistry Frontiers》 SCIE EI 2020年第5期1161-1171,共11页
The detection of antibiotics in environmental water or food is of great importance for protecting human health.New facile methods and high-performance sensory materials for the detection of antibiotics are highly desi... The detection of antibiotics in environmental water or food is of great importance for protecting human health.New facile methods and high-performance sensory materials for the detection of antibiotics are highly desirable.Herein,we present two isomeric In(Ⅲ)-MOFs,BUT-172 and BUT-173,which have slightly different three-dimensional(3D)open framework structures consisting of 1D infinite secondary building units(SBUs)and bridging tritopic carboxylate ligands.Both of the MOFs show a high porosity,and their micropore volumes and BET surface areas were estimated to be 0.66 and 0.67 cm3g-1,and 1357 and 1366 m2g-1,respectively.Stability tests revealed a high stability of the two MOFs in liquid water at room temperature. 展开更多
关键词 fluoroquinolone antibiotics water detection isomeric mofs detection antibiotics environmental water microporous materials stability test bridging tritopic carboxylate ligandsboth
Stability test of fractional-delay systems via integration 认领 引用 被引量：7
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作者 WANG ZaiHua DU MaoLin SHI Min 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第10期1839-1846,共8页
This paper focuses on the stability testing of fractional-delay systems. It begins with a brief introduction of a recently reportedalgorithm, a detailed demonstration of a failure in applications of the algorithm and ... This paper focuses on the stability testing of fractional-delay systems. It begins with a brief introduction of a recently reportedalgorithm, a detailed demonstration of a failure in applications of the algorithm and the key points behind the failure. Then,it presents a criterion via integration, in terms of the characteristic function of the fractional-delay system directly, for testingwhether the characteristic function has roots with negative real parts only or not. As two applications of the proposed criterion,an algorithm for calculating the rightmost characteristic root and an algorithm for determining the stability switches, are proposed.The illustrative examples show that the algorithms work effectively in the stability testing of fractional-delay systems. 展开更多
关键词 fractional-order derivative time delay stability test characteristic root
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Temporal stability analysis and thermal performance of non-Newtonian nanofluid over a shrinking wedge 认领 引用
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作者 Ahmed Zeeshan Muhammad Imran Khan +1 位作者 Aaqib Majeed Mohammed Sh.Alhodaly 《Propulsion and Power Research》 SCIE 2024年第4期586-596,共11页
The authors use a temporal stability analysis to examine the hydrodynamics performance of flow response quantities to investigate the impacts of pertained parameters on Casson nanofluid over a porous shrinking wedge.T... The authors use a temporal stability analysis to examine the hydrodynamics performance of flow response quantities to investigate the impacts of pertained parameters on Casson nanofluid over a porous shrinking wedge.Thermal analysis is performed in the current flow with thermal radiation and the viscous dissipation effect.Boungiorno’s model is used to develop flow equations for Casson nanofluid over a shrinking wedge.An efficient similarity variable is used to change flow equations(PDEs)into dimensionless ordinary differential equations(ODEs)and numerical results are evaluated using MATLAB built-in routine bvp4c.The consequence of this analysis reveals that the impact of active parameters on momentum,thermal and concentration boundary layer distributions are calculated.The dual nature of flow response output i.e.Cfx is computed for various values of bT Z 2:5;3:5;4:5,and the critical value is found to be-1:544996,-1:591,and-1:66396.It is perceived that the first(upper branch)solution rises for the temperature profile when the value of thermal radiation is increased and it has the opposite impact on the concentration profile.Thermal radiation has the same critical value for Nux and Shx.The perturbation scheme is applied to the boundary layer problem to obtain the eigenvalues problem.The unsteady solution fðh;tÞconverges to steady solution foðhÞfor t/N when g0.However,an unsteady solution fðh;tÞdiverges to a steady solution foðhÞfor t/N when g<0.It is found that the boundary layer thickness for the second(lower branch)solution is higher than the first(upper branch)solution.This investigation is the evidence that the first(upper branch)solution is stable and reliable. 展开更多
关键词 Wedge flow Casson nanofluid Thermal radiation Stability test Eigenvalue
Recent Advances in Stability Improvement Strategies of M-Nx/C Catalysts Towards Oxygen Reduction Reaction 认领 引用 被引量：4
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作者 Xiaolong Jia Qinglei Meng +5 位作者 Ruixue Zheng Xiaohui Liu Yaling Zhao Changpeng Liu Meiling Xiao Wei Xing 《Renewables》 2023年第6期694-719,共26页
Although fuel cells possess advantages of high energy conversion efficiency and zero-carbon emission,their large-scale commercialization is restricted by expensive and scarce platinum(Pt)catalysts.Metal-nitrogen-carbo... Although fuel cells possess advantages of high energy conversion efficiency and zero-carbon emission,their large-scale commercialization is restricted by expensive and scarce platinum(Pt)catalysts.Metal-nitrogen-carbon(M-Nx/C)catalysts are hailed as the most promising candidates to replace Pt due to their considerable oxygen reduction reaction(ORR)activity and low cost.Despite tremendous progress in terms of active site identification and activity improvement being achieved in the past few decades,the M-Nx/C catalysts still suffer from insufficient durability,which drastically limits their practical application.In this regard,understanding degradation mechanisms and customizing stabilization strategies are of significant importance yet challengeable.In this review,we summarize the recent advances in the stability improvement of M-Nx/C catalysts.The stability test protocols of the M-Nx/C are firstly introduced.Subsequently,with the combination of advanced ex situ and in situ characterization techniques and density functional theory calculation,we present a comprehensive overview of the main degradation mechanisms during ORR process.Aiming at these deactivation issues,a variety of novel improvement strategies are developed to enhance the stability of M-Nx/C.Finally,the current challenges and prospects to design highly stable M-Nx/C catalysts are also proposed. 展开更多
关键词 oxygen reduction reaction M-Nx/C catalysts stability test protocols degradation mechanisms stability improvement strategies
Predicting stability of integrated circuit test equipment using upper side boundary values of normal distribution 认领 引用 被引量：2
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作者 Zhan Wenfa Hu Xinyi +3 位作者 Zheng Jiangyun Yu Chuxian Cai Xueyuan Zhang Lihua 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2024年第2期85-93,共9页
In response to the growing complexity and performance of integrated circuit(IC),there is an urgent need to enhance the testing and stability of IC test equipment.A method was proposed to predict equipment stability us... In response to the growing complexity and performance of integrated circuit(IC),there is an urgent need to enhance the testing and stability of IC test equipment.A method was proposed to predict equipment stability using the upper side boundary value of normal distribution.Initially,the K-means clustering algorithm classifies and analyzes sample data.The accuracy of this boundary value is compared under two common confidence levels to select the optimal threshold.A range is then defined to categorize unqualified test data.Through experimental verification,the method achieves the purpose of measuring the stability of qualitative IC equipment through a deterministic threshold value and judging the stability of the equipment by comparing the number of unqualified data with the threshold value,which realizes the goal of long-term operation monitoring and stability analysis of IC test equipment. 展开更多
关键词 K-means clustering algorithm the upper side boundary of normal distribution threshold integrated circuit(IC)test equipment stability analysis
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Improved 2-D Stability Margin Test for 2-D Discrete Systems 认领 引用 被引量：3
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作者 XIAO Yang\ DU Xiyu Institute of Information Science, Northern Northern Jiaotong University, Beijing, 100044 Rolf Unbehuen is with Lehrstuhl f Allgemeine und Theoretische Elektrotechnik UniversitT Erlangen Nrnberg, Cauerstr.7, 91058, Germany 《Systems Science and Systems Engineering》 1998年第2期100-105,共6页
An improved 2 D stability margin test and its algorithm for 2 D discrete systems are proposed.The stability margin test procedure can be slmplified by using the inner term polynomials of B(z 1,z 2) to construct a marg... An improved 2 D stability margin test and its algorithm for 2 D discrete systems are proposed.The stability margin test procedure can be slmplified by using the inner term polynomials of B(z 1,z 2) to construct a margin test table.Different from other well known 2 D stability margin test algorithms,the new approach can directly obtain the stability margin. 展开更多
关键词 D discrete systems 2 D stability margin test test theorems and algorithm
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