检索结果-南通市图书馆

Physico−mathematical model of the voltage−current characteristics of light-emitting diodes with quantum wells based on the Sah−Noyce−Shockley recombination mechanism

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2024年第8期45卷 25-33页

作者： Fedor i.Manyakhin Dmitry O.Varlamov Vladimir P.Krylov Lyudmila O.Morketsova Arkady A.Skvortsov Vladimir K.Nikolaev Dinamics Strength of Machines and Resisance of MaterialsMoscow Polytechnic UniversityRussia Biomedical and Electronic Means and Technologies Vladimir State UniversityRussia Computer-Aided Design and Engineering National University of Science and Technology"MISiS"Russia

Herein,a physical and mathematical model of the voltage−current characteristics of a p−n heterostructure with quantum wells(QWs)is prepared using the Sah−Noyce−Shockley(SNS)recombination mechanism to show the SNS recombination rate of the correction function of the distribution of QWs in the space charge region of diode configuration.A comparison of the model voltage−current characteristics(VCCs)with the experimental ones reveals their *** technological parameters of the structure of the VCC model are determined experimentally using a nondestructive capacitive approach for determining the impurity distribution profile in the active region of the diode structure with a profile depth resolution of up to 10Å.The correction function in the expression of the recombination rate shows the possibility of determining the derivative of the VCCs of structures with QWs with a nonideality factor of up to 4.

关键词： light-emitting diodes with quantum wells voltage−current relation nonideality factor recombination mechanism Sah−Noyce−Shockley model

influence of donor age on liver transplantation outcomes: A multivariate analysis and comparative study

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2024年第2期16卷 331-344页

作者： Miran Bezjak ivan Stresec Branislav Kocman Stipislav Jadrijević Tajana Filipec Kanizaj Miro Antonijević Bojana Dalbelo Bašić Danko Mikulić Department of Surgery University Hospital MerkurZagreb 10000Croatia Department of Electronics MicroelectronicsComputer and Intelligent SystemsFaculty of Electrical Engineering and ComputingZagreb 10000Croatia Department of Gastroenterology University Hospital MerkurZagreb 10000Croatia Development of Software Nanobit Ltd.Zagreb 10000Croatia

BACKGROUND The growing disparity between the rising demand for liver transplantation(LT)and the limited availability of donor organs has prompted a greater reliance on older liver ***,utilizing livers from elderly donors has been associated with outcomes inferior to those achieved with grafts from younger *** accounting for additional risk factors,we hypothesize that the utili-zation of older liver grafts has a relatively minor impact on both patient survival and graft *** To evaluate the impact of donor age on LT outcomes using multivariate analysis and comparing young and elderly donor *** in the period from April 2013 to December 2018,656 adult liver transplants were performed at the University Hospital *** multivariate Cox propor-tional hazards models were developed to independently assess the significance of donor *** age was treated as a continuous *** approach involved univariate and multivariate analysis,including variable selection and assessment of interactions and ***,to exemplify the similarity of using young and old donor liver grafts,the group of 87 recipients of elderly donor liver grafts(≥75 years)was compared to a group of 124 recipients of young liver grafts(≤45 years)from the *** rates of the two groups were estimated using the Kaplan-Meier method and the log-rank test was used to test the differences between *** Using multivariate Cox analysis,we found no statistical significance in the role of donor age within the constructed *** when retained during the entire model development,the donor age's impact on survival remained insignificant and transformations and interactions yielded no substantial effects on *** insigni-ficance and low coefficient values suggest that donor age does not impact patient survival in our ***,there was no statistical evidence that the five developed models did not adhe

关键词： Liver transplantation Elderly donors Survival analysis Postoperative complications Cox proportional hazard models

Genotypic effects on accelerated propagation of oil palm breeding materials selected(Elaeis guineensis jacq.)using somatic embryogenesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Oil Crop Science 2024年第2期9卷 111-120页

作者： Retno Puji Astari Mohammad Basyuni Luthfi A.M. Siregar Revandy i.M. Damanike Deni Arifiyanto Dadang Affandi indra Syahputra Doctoral Program of Agricultural Sciences Faculty of AgricultureUniversitas Sumatera UtaraMedan20155North SumatraIndonesia PT.Socfin indonesia Jl.K.L.Yos Sudarso No.106Medan20244North SumatraIndonesia Department of Forestry Faculty of ForestryUniversitas Sumatera UtaraJl.Tri Dharma Ujung No.1Medan20155North SumatraIndonesia Center of Excellence for Mangrove Universitas Sumatera UtaraMedan20155Indonesia Department of Agrotechnology Faculty of AgricultureUniversitas Sumatera UtaraMedan20155North SumatraIndonesia

Vegetable oil production from oil palm(Elaeis guineensis Jacq.)is an important industry due to the rising demand every *** somatic embryogenesis culture can propagate oil palm duplicate as parent plant,which can be selected as breeding material to produce new planting germplasm with high production or disease *** study aims to evaluate the genotypic effect of somatic embryogenesis,while immature leaflets were employed as *** culture used embryo induction medium based on Murashige and Skoog(MS)modifications that contained 5 mg/L Naphthalene Acetic acid(NAA)and 0.5 mg/L Benzyl Amino Purine(BAP).The genotypic effect was statistically significant in the percentage of callus induction,producing somatic embryos,and germination *** this study,we successfully cloned thirteen oil palm genotypes(GE-02,GE-03,GE-06,GE-07,GE-09,GE-23,GE-24,GE-27,GE-28,GE-32,GE-33,GE-34,and GE-35),with the highest number of somatic embryos formed on GE-27 with a percentage of 70.1%.The cloning was successful in accelerating the propagation of oil palm for materials breeding programs to create new varieties with high production and disease *** is necessary to observation the performance of these clones in the field in terms of mantle flower appearance.

关键词： Somatic embryogenesis Oil palm Genotypic effect Support breeding

Exploring the impact of tacrolimus on kidney transplant recipients:insights into immunological outcomes

在线全文

学校读者我要写书评

暂无评论

Journal of Chinese Pharmaceutical Sciences 2024年第8期33卷 737-750页

作者： Zainab A Abbood Ahmed Hamza AL-Shammari Eman M.Jasim Amjad i.Oraibi Department of Pharmacy Kut University CollegeAlkutWasitIraq52001 AL-Manara College For Medical Science/Department of Pharmacy MisanIraq62001

To minimize graft rejection,it is crucial to reduce *** the present study,we investigated immunological markers in the blood of transplant patients who did not receive *** also assessed alloreactive CD4+CD25+FoxP3+Tregs both before transplantation and after tacrolimus *** comparative analysis included 50 individuals experiencing early rejection after tacrolimus discontinuation and 100 *** reducing tacrolimus,rejectors exhibited elevated levels of memory CD8+T cells compared to Tregs,while non-rejectors displayed a lower ratio of memory CD4+T cells to *** tacrolimus removal,rejectors showed an increase in naïve T cells and a decrease in effector T *** transplantation,CD4+Treg levels declined,but their anti-donor regulatory function remained consistent in both rejectors and *** correlation revealed an association between acute rejection after tacrolimus discontinuation and the pre-reduction ratio of memory T cells to regulatory T *** indicators identified individuals whose immunosuppression could be safely reduced.

关键词： Tacrolimus Kidney Transplant immune system Rejection

Design of Biologically Active Macromolecular Ligands and Their Luminescent Complexes with Terbium ions

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第5期42卷 604-611,I0007页

作者： Tatiana N.Nekrasova Andrei i.Fischer Natalia A.Nesterova Anatoliy V.Dobrodumov Anzhelika V.Garshinina Olga D.Shuvaeva Natalya V.Zakharova Evgenii F.Panarin institute of Macromolecular Compounds Russian Academy of Sciences31 Bolshoy pr.St Petersburg199004Russia Smorodintsev Research institute of influenza Russian Ministry of Health15/17 ul.prof.PopovaSt Petersburg197376Russia

Water-soluble copolymers of p-methacrylamidobenzoic acid(MABA)with neutral comonomers(N-vinylpyrrolidone(VP),N-methyl-N-vinylacetamide(MVAA),N-methacryloyl glucosamine(MAG))and anionic comononer sodium styrene sulfonate(NaSS)were synthesized by radical *** interactions between the prepared copolymers and Tb^(3+)ions in aqueous solutions were studied;the significant influence of chemical structure of a comonomer on luminescence intensity of Tb^(3+)complexes with the copolymers was *** luminescence intensity of Tb^(3+)complexes with the copolymers containing N-vinylamide units(VP,MVAA)is three times more intense than that observed for the complexes between Tb^(3+)and MAG-containing *** the case of NaSS-containing copolymers,the luminescence intensity is controlled by the values of binding constants between Tb^(3+)and MABA and the content of MABA units in a *** studied copolymers and their complexes with Tb^(3+)have low cytotoxicity and a pronounced antiviral activity against human respiratory syncytial virus.

关键词： Luminescence Water-soluble copolymers Lanthanide complexes Antiviral activity Cytotoxicity

Experimental test of a building thermal system for preventive maintenance based on thermoeconomic analysis

在线全文

学校读者我要写书评

暂无评论

Energy Storage and Saving 2024年第1期3卷 42-51页

作者： i.Prol-Godoy A.Picallo-Perez J.M.Sala-Lizarraga J.Rey-Martínez Research group ENEDi Department of Thermal EngineeringUniversity of the Basque Country(UPV/EHU)Bilbao48013Spain Research Group Termotecnia University of ValladolidValladolid47002Spain

An analysis of the sectorial structure of energy consumption shows that residential and tertiary sector buildings are the third-highest consumers,responsible for 29.5%of a city’s final energy *** Building Quality Control Laboratory of the Basque Government aims to promote quality,innovation,and sustainability in *** accomplish this goal,it has constructed an experimental facility with different energy generation technologies and a very versatile control system for testing different energy systems and operation *** this study,we tested a facility for supplying domestic hot water and heating for a multi-family house by means of a condensing boiler and an aerothermal heat pump(together with the corresponding control).This installation could reproduce the thermal demands required to be satisfied by the generation equipment through a programmed operation of the installation based on real ***,this installation was analyzed using thermoeconomics(TE)to solve problems unable to be solved using traditional energy analyses based on the First Law of *** problems include:(1)Determining the costs of the products of the installation based on physical criteria,(2)detecting the places where losses actually occur,evaluating their costs,and proposing cost-effective improvements,and(3)diagnosing issues in the *** a result,this paper suggests a solution to the preventive maintenance problems confronting the technical maintenance personnel for thermal installations in buildings by applying TE knowledge and using real data collected from sensors.

关键词： Experimental essay Energy savings in thermal systems Thermoeconomics Thermoeconomic costs Diagnosis

Levels of evidence and grades of recommendation supporting European society for medical oncology clinical practice guidelines

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Oncology Research 2024年第5期32卷 807-815页

作者： MARKO SKELiN BRUNA PERKOV-STiPiČiN SANJA VUŠKOViĆ MARiNAŠANDRK PLEHAČEK ANE BAŠiĆ DAViDŠARČEViĆ MAJA iLiĆ iVAN KREČAK Pharmacy Department General Hospital ofŠibenik-Knin CountyŠibenikCroatia Faculty of Medicine University of RijekaRijekaCroatia Undergraduate Study in Nursing University of Applied SciencesŠibenikCroatia Department of Oncology University Hospital Center ZagrebZagrebCroatia Pharmacies Joukhadar Sveta NedeljaCroatia Pharmacies Prima Pharme ZagrebCroatia Pharmacy Department General Hospital ZadarZadarCroatia Pharmacy Department General Hospital PulaPulaCroatia Department of internal Medicine General Hospital ofŠibenik-Knin CountyŠibenikCroatia

Background:The European Society for Medical Oncology(ESMO)guidelines are among the most comprehensive and widely used clinical practice guidelines(CPGs)***,the level of scientific evidence supporting ESMO CPG recommendations has not been systematically *** study assessed ESMO CPG levels of evidence(LOE)and grades of recommendations(GOR),as well as their trends over time across various cancer ***:We manually extracted every recommendation with the infectious Diseases Society of America(iDSA)classification from each *** examined the distribution of LOE and GOR in all available ESMO CPG guidelines across different topics and cancer ***:Among the 1,823 recommendations in the current CPG,30%were classified as LOEⅠ,and 43%were classified as GOR ***,there was a slight decrease in LOEⅠ(−2%)and an increase in the proportion of GOR A(+1%)in the current CPG compared to previous *** proportion of GOR A recommendations based on higher levels of evidence such as randomized trials(LOEⅠ–Ⅱ)shows a decrease(71%vs.63%,p=0.009)while recommendations based on lower levels of evidence(LOEⅢ–Ⅴ)show an increase(29%vs.37%,p=0.01)between previous and current *** the current versions,the highest proportion of LOEⅠ(42%)was found in recommendations related to pharmacotherapy,while the highest proportion of GOR A recommendations was found in the areas of pathology(50%)and diagnostic(50%)*** variability in LOEⅠand GOR A recommendations and their changes over time was observed across different cancer ***:One-third of the current ESMO CPG recommendations are supported by the highest level of *** well-designed randomized clinical trials are needed to increase the proportion of LOEⅠand GOR A recommendations,ultimately leading to improved outcomes for cancer patients.

关键词： ESMO guidelines Clinical practice guidelines Level of evidence Grade of recommendation

A Dimensional Reduction Approach Based on Essential Constraints in Linear Programming

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Operations Research 2024年第1期14卷 1-31页

作者： Eirini i. Nikolopoulou George S. Androulakis Department of Mathematics University of Patras Patras Greece Department of Business Administration University of Patras Patras Greece

This paper presents a new dimension reduction strategy for medium and large-scale linear programming problems. The proposed method uses a subset of the original constraints and combines two algorithms: the weighted average and the cosine simplex algorithm. The first approach identifies binding constraints by using the weighted average of each constraint, whereas the second algorithm is based on the cosine similarity between the vector of the objective function and the constraints. These two approaches are complementary, and when used together, they locate the essential subset of initial constraints required for solving medium and large-scale linear programming problems. After reducing the dimension of the linear programming problem using the subset of the essential constraints, the solution method can be chosen from any suitable method for linear programming. The proposed approach was applied to a set of well-known benchmarks as well as more than 2000 random medium and large-scale linear programming problems. The results are promising, indicating that the new approach contributes to the reduction of both the size of the problems and the total number of iterations required. A tree-based classification model also confirmed the need for combining the two approaches. A detailed numerical example, the general numerical results, and the statistical analysis for the decision tree procedure are presented.

关键词： Linear Programming Binding Constraints Dimension Reduction Cosine Similarity Decision Analysis Decision Trees

Change in Grain-Size Composition of Lignite under Cyclic Freezing-Thawing and Wetting-Drying

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Natural Resources 2024年第1期15卷 17-27页

作者： Natalia S. Batugina Vladislav i. Fedorov Chersky institute of Mining of the North Siberian Branch Russian Academy of Sciences Yakutsk Russia

The paper presents the change in grain-size composition of lignite under cyclic freezing-thawing (FTC) and wetting-drying (WDC). The article shows that in the spring and autumn periods the lignites can be subjected to repeated freezing-thawing and wetting-drying, which determines the possibility of changing their grain-size composition and structure. Experimental studies in laboratory conditions on the influence of cyclic freezing-thawing (FTC) and wetting-drying (WDC) on the quality indicators of lignites have been carried out, their granulometric (fractional) composition has been studied. Freezing-thawing cycle conditions are as follows (FTC): minimum exposure temperature: -20°C;maximum: +5°C;relative humidity: 30%;number of processing cycles: 3. Wetting-drying cycles are as follows (WDC): drying temperatures are +20, +40, +60, +80°C, drying time 90 minutes, the coals are further subjected to rain (soaking) for a period of water saturation to humidity of 30% - 40% and dry again. The number of wetting-drying cycles is 3 times. The tests have revealed the destructive effects of FTC and WDC on the samples of lower metamorphic grade coal, and the cycles of wet-dry lead to the much higher yield of fine sizes (-6+0;-13+0 mm) than the cycles of freeze-thaw. Furthermore, it is found that the increase in the yield of fines depends on the heating temperature: coal disintegration proceeds more intensively at a higher temperature of drying.

关键词： Lignite Freezing-Thawing Cycle Wetting-Drying Cycle Grain Size Composition Dust Coal Storage Loss Quality