检索结果-南通市图书馆

A Fault Detection Method for Electric Vehicle battery System based on bayesian Optimization SVDD Considering a Few Faulty Samples

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy Engineering 2024年第9期121卷 2543-2568页

作者： Miao Li Fanyong Cheng Jiong Yang maxwell Mensah Duodu Hao Tu School of Electronics and Electrical Engineering Anhui Polytechnic UniversityWuhu241000China

Accurate and reliable fault detection is essential for the safe operation of electric *** vector data description(SVDD)has been widely used in the field of fault ***,constructing the hypersphere boundary only describes the distribution of unlabeled samples,while the distribution of faulty samples cannot be effectively described and easilymisses detecting faulty data due to the imbalance of sample ***,selecting parameters is critical to the detection performance,and empirical parameterization is generally timeconsuming and laborious and may not result in finding the optimal ***,this paper proposes a semi-supervised data-driven method based on which the SVDD algorithm is improved and achieves excellent fault detection *** incorporating faulty samples into the underlying SVDD model,training deals better with the problem of missing detection of faulty samples caused by the imbalance in the distribution of abnormal samples,and the hypersphere boundary ismodified to classify the samplesmore *** bayesian Optimization NSVDD(bO-NSVDD)model was constructed to quickly and accurately optimize hyperparameter *** the experiments,electric vehicle operation data with four common fault types are used to evaluate the performance with other five models,and the results show that the bO-NSVDD model presents superior detection performance for each type of fault data,especially in the imperceptible early and minor faults,which has seen very obvious ***,the strong robustness of the proposed method is verified by adding different intensities of noise in the dataset.

关键词： Fault detection vehicle battery system lithium batteries fault samples

EZH2 inhibitors promote β-like cell regeneration in young and adult type 1 diabetes donors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2024年第2期9卷 679-692页

作者： Keith Al-Hasani Safiya Naina Marikar Harikrishnan Kaipananickal Scott maxwell Jun Okabe Ishant Khurana Thomas Karagiannis Julia J.Liang Lina Mariana Thomas Loudovaris Thomas Kay Assam El-Osta Epigenetics in Human Health and Disease Program Baker Heart and Diabetes Institute75 Commercial RoadMelbourne 3004 VICAustralia Department of Diabetes Central Clinical SchoolMonash UniversityMelbourne 3004 VICAustralia Epigenetics in Human Health and Disease Laboratory Central Clinical SchoolMonash UniversityMelbourne 3004 VICAustralia School of Science STEM CollegeRMIT UniversityMelbourne 3001 VICAustralia Immunology and Diabetes Unit St Vincent’s Institute of Medical ResearchFitzroy 3065 VICAustralia Department of Medicine and Therapeutics The Chinese University of Hong KongSha TinHong Kong SAR Hong Kong Institute of Diabetes and Obesity Prince of Wales HospitalThe Chinese University of Hong Kong3/F Lui Che Woo Clinical Sciences Building30-32-Ngan Shing StreetSha TinHong Kong SAR Li Ka Shing Institute of Health Sciences The Chinese University of Hong KongSha TinHong Kong SAR biomedical Laboratory Science Department of TechnologyFaculty of HealthUniversity College CopenhagenCopenhagenDenmark

β-cells are a type of endocrine cell found in pancreatic islets that synthesize,store and release *** type 1 diabetes(T1D),T-cells of the immune system selectively destroy the insulin-producingβ-*** of these cells leads to a lifelong dependence on exogenous insulin administration for ***,there is an urgent need to identify novel therapies that stimulateβ-cell growth and induceβ-cell *** and others have shown that pancreatic ductal progenitor cells are a promising source for regeneratingβ-cells for T1D owing to their inherent differentiation *** transcriptional suppression is refractory to exocrine reaction and tightly controls the regenerative potential by the EZH2 *** the present study,we show that transient stimulation of exocrine cells,derived from juvenile and adult T1D donors to the FDAapproved EZH2 inhibitors GSK126 and Tazemetostat(Taz)influence a phenotypic shift towards aβ-like cell *** transition from repressed to permissive chromatin states are dependent on bivalent H3K27me3 and H3K4me3 chromatin *** EZH2 is fundamental toβ-cell regenerative *** pancreatic ductal cells exhibit insulin production and secretion in response to a physiological glucose challenge ex *** pre-clinical studies underscore the potential of small molecule inhibitors as novel modulators of ductal progenitor differentiation and a promising new approach for the restoration ofβ-like cell function.

关键词： EZH2 struction inhibitors

Probing the bardeen-Kiselev black hole with the cosmological constant caused by Einstein equations coupled with nonlinear electrodynamics using quasinormal modes and greybody bounds

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第6期76卷 102-119页

作者： S R Wu b Q Wang Z W Long College of Physics Guizhou UniversityGuiyang 550025China College Pharmacy Guizhou University of Traditional Chinese MedicineGuiyang 550025China

In this work,we investigate a static and spherically symmetric bardeen-Kiselev black hole(bH)with the cosmological constant,which is a solution of the Einstein-non-linear maxwell field *** compute the quasinormal frequencies for the bardeen-Kiselev bH with the cosmological constant due to electromagnetic and gravitational *** varying the bH parameters,we discuss the behavior of both real and imaginary parts of the bH quasinormal frequencies and compare these frequencies with the Reissner-Nordström-de Sitter bH surrounded by quintessence(RN-dSQ).Interestingly,it is shown that the responses of the bardeen-Kiselev bH with the cosmological constant and the RN-dSQ under electromagnetic perturbations are different when the charge parameter q,the state parameter w and the normalization factor c are varied;however,for the gravitational perturbations,the responses of the bardeen-Kiselev bH with the cosmological constant and the RN-dSQ are different only when the charge parameter q is ***,compared with the gravitational perturbations,the electromagnetic perturbations can be used to understand nonlinear and linear electromagnetic fields in curved spacetime *** interesting observation is that,due to the presence of Kiselev quintessence,the electromagnetic perturbations around the bardeen-Kiselev bH with the cosmological constant damps faster and oscillates slowly;for the gravitational perturbations,the quasinormal mode decays slowly and oscillates *** also study the reflection and transmission coefficients along with the absorption cross section in the bardeen-Kiselev bH with the cosmological constant;it is shown that the transmission coefficients will increase due to the presence of Kiselev quintessence.

关键词： quasinormal modes greybody factors bardeen-Kiselev black hole with cosmological constant

The assessment of heavy metal pollution in river sands of Jalingo,Nigeria using magnetic proxy parameters,pollution,and ecotoxicological indices

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2022年第6期41卷 1083-1103页

作者： maxwell O.Kanu Augustine A.Abong Department of Physics Faculty of ScienceTaraba State UniversityP.M.B.1167JalingoTaraba StateNigeria Department of Physics Faculty of ScienceCross River University of TechnologyP.M.B.1123CalabarNigeria

The measurement of environmental magnetic properties and metal contents of sands from Nukkai(NKR),Mayo-Gwoi(RMYG)and Lamurde(LR)rivers located in Jalingo,Nigeria are *** seek to determine the extent of anthropogenic impact on the river sands using magnetic-proxy-parameters,pollution and ecotoxicological indices and multivariate *** of magnetic susceptibilityχ,frequency-dependentsusceptibilityχfd%,anhystericremanent magnetization,isothernal remanent magnetization and X-ray fluorescence were *** average values of theχ(in×10^(-8)m^(3)kg^(-1))were 24.53,12.76 and 39.27 for NKR,RMYG and LR sites respectively,implying that the magnetic minerals in the sands were mostly *** meanχfd%value of 2.64%,4.85%and 3.53%for NKR,RMYG and LR respectively suggest that the study area was dominated by multi-domain magnetic grain *** value of the S-ratio is~1 in all river samples,suggesting that low coercivity magnetic minerals(e.g.,magnetite)dominated the *** mean concentrations of Ti,Zr,Sn,ba and Pb were higher than the background values in the studied *** the estimated pollution indices puts the level of pollution of the river sands between low and moderate pollution with Sn,ba and Pb as the elements of *** sources of metal contents such as fertilizers,pesticides,waste dumps and vehicular sources *** *** positive correlations between magnetic parameters(particularly,SIRM)and some heavy metals and pollution/ecotoxicological indices were obtained,showing that magnetic methods could be used as a geochemical proxy for pollution assessment.

关键词： Magnetic susceptibility Ecotoxicological risk index Pollution index Heavy metals pollution River

Accuracy of common stem volume formulae using terrestrial photogrammetric point clouds:a case study with savanna trees in benin

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2021年第6期32卷 2415-2422页

作者： Hospice A.Akpo Gilbert Atindogbe maxwell C.Obiakara Arios b.Adjinanoukon Madai Gbedolo Noel H.Fonton Laboratoire d’Etudes et de Recherche en Statistiques et biométrie Appliquee FSAUniversite D’Abomey-Calavi01 BP 526CotonouBenin Ecology Unity Department of BotanyUniversity of IbadanIbadan 20084Nigeria

Recent applications of digital photogrammetry in forestry have highlighted its utility as a viable mensuration ***,in tropical regions little research has been done on the accuracy of this approach for stem volume *** this study,the performance of Structure from Motion photogrammetry for estimating individual tree stem volume in relation to traditional approaches was *** selected 30 trees from five savanna species growing at the periphery of the W National Park in northern benin and measured their circumferences at different heights using traditional tape and *** volumes of sample trees were estimated from the measured circumferences using nine volumetric formulae for solids of revolution,including cylinder,cone,paraboloid,neiloid and their respective *** tree was photographed and stem volume determined using a taper function derived from tri-dimensional stem *** reference volume was compared with the results of formulaic *** stem profiles were further decomposed into different portions,approximately corresponding to the stump,butt logs and logs,and the suitability of each solid of revolution was assessed for simulating the resulting *** volumes calculated using the fustrums of paraboloid and neiloid formulae were the closest to reference volumes with a bias and root mean square error of 8.0%and 24.4%,*** closely resembled fustrums of a paraboloid and a *** stem portions assumed different solids as follows:fustrums of paraboloid and neiloid were more prevalent from the stump to breast height,while a paraboloid closely matched stem shapes beyond this ***,a more accurate stem volumetric estimate was attained when stems were considered as a composite of at least three geometric solids.

关键词： Structure from motion photogrammetry Point cloud data Stem volume Savanna species benin

Offshoring and Reshoring： The Roles of Incomplete Contracts and Relative bargaining Power

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frontiers of Economics in China-Selected Publications from Chinese Universities 2018年第1期13卷 32-51页

作者： Ngo Van Long maxwell Tuuli Department of Economics McGill University Montreal Quebec H3A 2T7 Canada Peter b. Gustavson School. of business University of Victoria Victoria BC V8P 5C2 Canada

This paper demonstrates that an increase in bargaining power of Northern firms relative to that of their Southern contractors can trigger reshoring if the North- South wage differential is moderate, such that only industries with a high share of unskilled labor find outsourcing profitable. However, such an increase in Northern bargaining power can increase offshoring if the wage differential is so high that even industries with a low share of unskilled labor also offshore.

关键词： incomplete contracts bargaining power offshoring reshoring

Optimization and kinetic studies for enzymatic hydrolysis and fermentation of colocynthis vulgaris Shrad seeds shell for bioethanol production

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of bioresources and bioproducts 2021年第1期6卷 45-64页

作者： Igwilo Christopher Nnaemeka Egbuna Samuel O Onoh maxwell I Asadu OChristain Onyekwulu Chinelo S Department of Science Laboratory Technology Federal College of AgricultureP.M.BIshiaguEbonyi StateNigeria Department of Chemical Engineering Enugu State University of Science and Technology (ESUT)Nigeria Gregory University Uturu PMb 1012 Abia State Nigeria

The key process parameters for the hydrolysis and fermentation of Colocynthis vulgaris Shrad seeds shell(CVSSS)were optimized using the box-behnken Design(bbD)of Response Surface Methodology(RSM).Kinetic study was also carried *** proximate analysis of the CVSSS was done by the method of the Association of Organic and Applied Chemistry(AOAC).Enzymatic hydrolysis was experimented by using Aspergillus Niger as a crude enzyme isolated from soil at sawdust dump site and screened for cellulosic *** that affected the hydrolysis of the CVSSS were screened by using the Greco-Latin square design of ***,for Saccharomyces cerevisiae,factors that affected the fermentation of the CVSSS were screened by using the same Greco-Latin square design of ***,the result of the proximate analysis revealed that the CVSSS had 73.54%cellulose which could be converted to *** was established that temperature,pH and time had significant effect on hydrolysis,while the optimum results were obtained at 46.8℃,3.32 d,5.68 and 59.87%for temperature,time,pH and glucose yield,***,yeast dosage,pH and time had significant effect on fermentation,while the optimum results from optimization were found to be 33.58℃,7.0,3.55 d,1.65 g per 50 mL and 25.6%for temperature,pH,time,yeast dosage and ethanol yield,*** kinetics of both the enzymatic hydrolysis and fermentation agreed with the Michealis-Menten kinetic model with the correlation coefficients(R^(2))of 0.9708 and 0.8773,***,from the error analysis,the experimental and predicted values had a very good relationship as described by Michaelis-Menten model.

关键词： Ethanol Melon(Egusi)seed shell Hydrolysis Fermentation Optimization Kinetics

Effect of Nutrient Restriction on Social Transmission of Food Preferences Depends on Nutrient and Species

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of behavioral and brain Science 2014年第12期4卷 590-601页

作者： Darryl J. Mayeaux maxwell b. Wallace Anne M. Young Department of Psychology St. Bonaventure University New York USA

For omnivores to determine whether an unfamiliar item is an appropriate food, they could rely on personal information from sampling it themselves or rely on less risky observation of whether other individuals eat the item. Availability of information about food from social companions in group-living species is one of the benefits of group life. Adults of solitary-living species, however, seem typically less likely to rely on social information about food choice. If an individual faced a nutritional deficit, it would seem to increase the value of public information. This study addresses whether dietary restriction from certain nutrients (sodium, potassium, protein, carbohydrates) affects reliance on information about food from conspecifics. Without nutrient restriction, group-living Norway rats (Rattus norvegicus) preferred the diet that they smelled on the breath of a conspecific demonstrator, but solitary-living Syrian hamsters (Mesocricetus auratus) avoided it. Protein restriction yielded similar results as measured one hour into a diet choice test. Potassium restriction, however, reversed the pattern: rats avoided the demonstrator’s diet but hamsters preferred it. Clearly, the valence of social information depended on the nutrient from which individuals were restricted and the species under study. This could be related to the contrasting social organization that members of each species generate. Neither species relied on social information about the availability of a nutrient from which they were restricted if they could taste that nutrient for themselves (sodium, carbohydrates).

关键词： Social Learning Dietary Preference Nutrient Restriction

Analyzing Virtual World Region Fidelity on Scalability and Simulation Performance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Modelling and Simulation 2015年第3期3卷 126-135页

作者： Sean C. Mondesire Jonathan Stevens Rebecca Leis Douglas b. maxwell US Army Research Laboratory Orlando FL USA Institute for Simulation and Training University of Central Florida Orlando FL USA

Virtual world simulation offers tremendous potential opportunities to improve, and optimize, individual and collective echelon training for the military. The US Army Research Laboratory (ARL) Military Open Simulator Enterprise Strategy (MOSES) project’s charter is to investigate simulation-based training technology for use in military specific training domains. Of particular interest are attributes of virtual worlds such as geographically distributed large-scale trainee support. We have initiated a series of experiments to determine appropriate benchmarks for simulator performance and to determine appropriate independent variables in order to create a robust predictive model that will enable virtual world training scenario designers to calculate, a priori, the number of trainees that may synchronously operate in a virtual world. The present paper’s purposes were to determine the effect that virtual world region fidelity had on server performance and determine whether this independent variable would be appropriate for inclusion into our predictive model. We found that region fidelity had a statistically significant effect on the simulator’s processor memory usage but had no significant effect on the simulator’s vertical scalability, CPU usage nor network performance. In this paper, we discourse on the purpose of this research, our experimental methodology and results, and discuss the significance of our findings.

关键词： Region Fidelity Vertical Scaling Virtual World Simulation Performance Analysis Distributed Simulation