检索结果-南通市图书馆

Chinese Chemical Letters 2016年第7期27卷 1022-1026页

作者： Dong lu xiao-chun Yang Bing Leng xiao-Di Yang Cong-Wu Ge Xue-Shun Jia xi-Ke Gao Department of Chemistry College of Science Shanghai University Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Laboratory of Advanced Materials Fudan University

A series of core-expanded naphthalene diimides（NDI-DTYM） and thiophene-based derivatives（1a-c）were designed and synthesized to investigate the relationship between molecular structures and the highest occupied molecular orbital（HOMO） energy levels but has little impact on the lowest unoccupied molecular orbital（luMO） energy *** results demonstrated that increasing the number of thiophene units can gradually elevate the HOMO energy levels but had little impact on the luMO energy *** n-channel organic field-effect transistors（OFETs） based on 1b and 1c have demonstrated that these almost unchanged luMO energy levels are proper to transport electrons.

关键词： Naphthalene diimide Thiophene Molecular energy level Organic transistor Organic semiconductor

Stability of the formation interface under the impact of hydraulic fracture propagation in the vicinity of the formation interface

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2020年第4期17卷 1101-1118页

作者： Cong lu Yun-xiao lu Jian-chun Guo Li-ming Liu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China Sinopec Shengli Petroleum Engineering Co. Ltd.Underground Operation CompanyDongying 257077China PetroChina Sichuan-Chongqing Shale Gas Front Command Chengdu 610056China

Unconventional hydrocarbon reservoirs in layered formations,such as tight sandstones and shales,are continually being *** fracturing is a critical technology for the high-efficiency development of hydrocarbon *** the stress field and stability of the formation interface is vital to understanding stress propagation,preferably before the growing hydraulic fracture contacts the formation *** this study,models are developed for computing the stress field of hydraulic fracture propagation near the formation interface,and the stress fields within and at the two sides of the formation interface are *** failure modes of the interface under the impact of hydraulic fracture propagation in its vicinity are identified,and the corresponding failure criteria are *** simulating the magnitude and direction of peak stress at different parameters,the failure mode and stability of the formation interface are *** reveal that when the interface strength is weak,the formation interface fails before the growing hydraulic fracture contacts it,and its stability is significantly related to a variety of factors,including the type of formation interface,rock mechanical properties,far-field stress,structural parameters,distance between the hydraulic fracture and formation interface,and fracturing execution parameters.

关键词： Formation interface Fracture propagation Stress field Failure criterion Stability

Effects of orthodontic load on the periodontium of autogenously transplanted teeth in beagle dogs

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第11期14卷 1025-1032页

作者： lu lu Hui-fang SUN Han XUE Jing GUO Yang-xi CHEN Department of Orthodontics Stomatology HospitalSchool of StomatologyShandong University Shandong Provincial Key Laboratory of Oral Biomedicine Shandong University Department of Orthodontics West China College of StomatologySichuan University

Objective:To observe the periodontal healing of autogenously transplanted teeth loaded orthodontically after autotransplantation in Beagle ***:Forty-eight teeth were autogenously transplanted,24 of which were loaded postoperatively with orthodontic force at different time points and for different *** healing was evaluated by probing pocket depth(PPD),the expression of relevant proteins,and histomorphometric ***:The dental pockets of loaded and non-loaded teeth were both much deeper after the first postoperative week than before transplantation(P<0.05).Later,the PPD,which was measured after postoperative weeks 1,3,5,9 and 13,gradually became *** expressions of alkaline phosphatase(ALP)and basic fibroblast growth factor(bFGF)were higher in loaded teeth than in non-loaded teeth(P<0.05),and in groups subjected to two weeks duration of loading than in other groups at the same load time point(P<0.05).For the same load duration,the expressions of ALP and bFGF in teeth loaded after postoperative week 4 were higher than those of other treatments(P<0.05).According to histomorphometric analyses,an orthodontic force on transplanted teeth applied after postoperative weeks 4 or 8 for two weeks duration should be favorable for periodontal ***:It is advisable to apply an appropriate magnitude of force on autotransplanted teeth,such as orthodontic force,at appropriate time points and for a suitable duration,to achieve the optimal clinical prognosis following autogenous tooth *** results may serve as a basis for subsequent studies in humans so as to make clinical improvements.

关键词： Autogenous tooth transplantation Periodontium healing Orthodontic load

Preparation and application of mesoporous core-shell nanosilica using leucine derivative as template in effective drug delivery

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2020年第5期31卷 1165-1167页

作者： Wei Zhang Qiming Kan lu Chen luyao xie Mingshu Cui Ziyue xi Yanru xi Sanming Li lu Xu School of Pharmacy Shenyang Pharmaceutical UniversityShenyang 110016China School of Life Science&Bio-pharmaceutics Shenyang Pharmaceutical UniversityShenyang 110016China

Core-shell structured mesoporous silica nanoparticles have been firstly synthesized with the new template from L-leucine methyl ester hydrochloride(H-Leu-OMe·HCl).LMSNs were characterized by transmission electron microscopy(TEM),nitrogen adsorption/desorption,and small-angle X-ray diffraction(SAXRD),demonstrating a well-ordered *** loading doxorubicin hydrochloride(Dox) into pores,considerable loading capacity of 30.5% and favorable cumulative release amount were *** assay suggested that Dox-loaded LMSNs demonstrated great promise to *** use of MSNs with the synthesized template,as a drug delivery carrier,will exte nd the pharmaceutical applications of silica materials.

关键词： Core-shell structure Mesoporous silica nanoparticles Biomimetic method Template synthesis Self-assembly

Performance,microbial community and inhibition kinetics of long-term Cu2+ stress on an air-lift nitritation reactor with self-recirculation

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第5期32卷 117-127页

作者： Fan Feng Cheng-Shan Duan xi Tang xi Chen Xuan lu xi-Lin Chai Qaisar Mahmood Chong-Jian Tang Li-Yuan Chai Department of Environmental Engineering School of Metallurgy and EnvironmentCentral South UniversityChangsha410083China National Engineering Research Centre for Control and Treatment of Heary Metal Pollution Changsha410083China The Jiangxi Provincial Collaborative Research Institute for Environmental Protection Industry Wannian335500China Jiangxi Gaia Environmental Science&Technology Co. Ltd.Shangrao334000China Department of Environmental Sciences COMSATS UniversityAbbottabadPakistan

Biological nitrogen removal process could be affected due to the presence of heavy metals owing to their toxicity and accumulation in the *** this study,the impact of Cu2+shock on a long-term nitritation operation was investigated in an air-lift reactor with *** the dynamics of microbial community and inhibition kinetics under Cu2+stress were *** results showed that Cu2+exerted severe inhibition on nitritation performance of an air-lift reactor(ALR)at 25 mg/*** corresponding NH4+-N removal efficiency decreased to below 50%,which was mainly due to the variation of microbial community structure,especially the inhibition of nitrifiers like Nitrosomonas(the relative abundance decreased from 30%to 1%after Cu2+inhibition).Kinetic parameters were obtained and compared after fitting the Haldane *** long-term Cu2+stress on the ALR aggravated the ammonium affinity and the resistance to substrate self-inhibition of the nitritation sludge,but reduced the resistance to Cu2+***,Cu2+acted as uncompetitive inhibitor on nitritation *** results provide new insights into the nitritation characteristics under long-term Cu2+stress.

关键词： Nitritation Cu2+inhibition Microbial structure Haldane model Kinetics

The novel roles of circular RNAs in metabolic organs

在线全文

学校读者我要写书评

暂无评论

Genes & Diseases 2018年第1期5卷 16-23页

作者： Zhi-chun Zhang xiao-Long Guo xi Li Biology Science Institutes Chongqing Medical UniversityChongqing 400016PR China

Circular RNAs(circRNAs)with a covalently closed loop structure which was different with linear RNAs,recently re-merged as novel regulator and exerted function in multiple biological *** deep RNA sequencing(RNA-seq)technology coupled with bioinformatic analyses,a number of circRNAs has been ***,circRNAs exhibit tissue-and development-specific expression indicating their potential biological ***,function of circRNAs as miRNA sponge has been well demonstrated in some diseases,besides,circRNAs also could function as RNA binding protein sponge and regulate alternative splicing and gene ***,Emerging evidences showed that circRNAs played a pivotal role on the development of diseases including atherosclerotic vascular disease,neurological disorders and liver diseases,and served as diagnostic or predictive biomarkers of some *** review mainly discusses the current advance of circRNAs as regulator involved in many diseases,and highlights circRNAs which have been well elucidated biological and pathogenic mechanism.

关键词： Brain Circular RNAs Liver Metabolic disease Metabolism

New Families of Exact Excitations to （2＋1）-Dimensional Toda Lattice System via an Extended Projective Approach

维普期刊数据库评论

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 2006年第5期45卷 864-868页

作者： FANG Jian-Ping FEI Jin-xi ZHENG chun-Long College of Physics and Mathematics Lishui University Lishui 323000 China Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072China

In this paper, the extended projective approach, which was recently presented and successfully used in some continuous nonlinear physical systems, is generalized to nonlinear partial differential-difference systems （DDEs）, As a concrete example, new families of exact solutions to the （2＋1）-dimensional Toda lattice system are obtained by the extended projective approach.

关键词： extended projective approach DDEs Toda lattice exact solution

Association of cumulative resting heart rate exposure with rapid renal function decline:a prospective cohort study with 27,564 older adults

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2023年第9期20卷 673-683页

作者： xi JIANG xian SHAO xing LI Pu-Fei BAI Hong-Yan LIU Jia-Mian CHEN Wei-xi WU Zhuang CUI Fang HOU chun-Lan lu Sai-Jun ZHOU Pei YU NHC Key Laboratory of Hormones and Development Chu Hsien-I Memorial Hospital and Tianjin Institute of EndocrinologyTianjin Medical UniversityTianjinChina Tianjin Key Laboratory of Metabolic Diseases Tianjin Medical UniversityTianjinChina Ordos Center Hospital OrdosInner MongoliaSudu StreetKangbashi DistrictOrdos CityChina Department of Epidemiology and Health Statistics Tianjin Medical UniversityHeping DistrictTianjinChina Community Health Service Center Jiefang RoadTanggu StreetBinhai New DistrictTianjinChina

OBJECTIVE To evaluate the prospective association between cumulative resting heart rate(cumRHR)and rapid renal function decline(RRFD)in a cohort of individuals aged 60 and *** In the Tianjin Chronic Kidney Disease Cohort Study,the individuals who underwent three consecutive physical examinations between 2014 and 2017,with estimated glomerular filtration rate(eGFR)greater than 60 mL/min per 1.73 m2 and aged 60 years or older were enrolled.A total of 27,564 patients were prospectively followed up from January 1,2017 to December 31,*** 3-year cumRHR was *** primary outcome was RRFD,defined as an annualized decline in eGFR of 5 mL/min per 1.73 m2 or *** and restricted spline regression models and subgroup analysis were used to investigate the association of cumRHR with RRFD after adjusting for all *** During a median follow-up of 3.2 years,a total of 4,347(15.77%)subjects developed *** fully-adjusted models,compared with the lowest quartile of cumRHR,the odds ratio(OR)for the highest was 1.44(1.28–1.61),P<***,each 1-standard deviation(27.97 beats/min per year)increment in cumRHR was associated with a 17%(P<0.001)increased risk of RRFD,with a linear positive correlation(P for non-linear=0.803).Participants with a 3-year cumRHR≥207(beats/min)*year(equivalent to≥69 beats/min per year in 3 years)were found to be at a higher risk of *** The cumRHR is significantly associated with a higher risk of RRFD among older *** results might provide an effective goal for managing and delaying the decline of renal function in the older adults.

关键词： prospective Kidney function

Recent advances in synthesis of organosilicons via radical strategies

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第4期32卷 1280-1292页

作者： Xueping Zhang Jingkun Fang chun Cai Guoping lu School of Chemical Engineering Nanjing University of ScienceTechnologyNanjing 210094China

Organosilicon compounds play an important role in the fields of materials science,pharmacy,and organic *** development of effective approaches for the preparation of these compounds have also become a research focus in organic *** recent years,free radical synthesis of organosilicons has been vigorously developed,which generally has the advantages of milder synthesis conditions,higher yields and selectivity,and free of precious metal catalysts compared with traditional *** article reviews research progresses in the synthesis of organosilico n compounds by free radical pathways since *** most cases,the radical silylation is achieved based on the reaction of silyl radicals,which are triggered by four routes including peroxide,transition-metal-induced peroxide decomposition,alkali,*** alkyl radicals can also initiate the radical silylation for the generation of C(sp^(3))—Si bonds.

关键词： Organosilicon Radical silylation Single electron transfer Hydrogen atom transfer Photoredox Alkyl radical

Environmental effect of vegetation restoration on degraded ecosystem in low subtropical China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2003年第4期15卷 514-519页

作者： PENG Shao-lin YANG Liu-chun lu Hong-fang South China Institute of Botany Chinese Academy of SciencesGuangzhou 510650China.

The environmental effect of degraded ecosystem's vegetation restoration in low subtropical China was studied. Results indicated that the vegetation recovery on degraded lands significantly ameliorates surrounding environment, increases species diversity, improves soil structure, raises soil fertility, enhances productivity, and promotes regional agricultural production and social economic development dramatically. Through the combining engineering and biological measures, the restoration of degraded ecosystem in low subtropical area is possible and economical. The restoration experience in xiaoliang, Wuhua and other sites are valuable for other degraded subtropical area was introduced.

关键词： vegetation restoration degraded ecosystem low subtropical zone environment impact