检索结果-南通市图书馆

Journal of Mountain Science 2019年第11期16卷 2654-2662页

作者： LU Ya-feng Li Qin-wen wang Yu-kuan XU Pei Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China

With the accelerated urbanization,human activities pose serious threats to species because of *** conservation corridors between habitats could improve species mobility in order to address the human ***,there are a limited number of studies that focus on assessing the effect of human activities on species movement in mountain areas as well as how to integrate different conservation models relating to conservation corridors *** our study,we modified the resistance model and took land use data as input parameters to quantify the impacts of human activities in mountain ***,different conservation planning models,including Circuit model and Least Cost Path(LCP)algorithm,were ***,our approach was applied to identify giant panda corridors in Miarro nature reserve,Caopo nature reserve,and Wolong nature *** results suggested that the impacts of human activities were limited in valley regions due to topography by resistance ***,Circuit model demonstrated that the conservation corridors for giant panda could not be identified between the Miarro and the Caopo nature ***,more detailed corridors between habitats were planned by the LCP ***,we also identified bottlenecks for migration in each corridor,indicating that human activities’interference was the primary *** approach not only could connect habitats for conservation in mountain areas but also found out that the corridor could not be identified between habitats.

关键词： Corridors Human activities Mountain areas Giant panda

Understanding Bridging Sites and Accelerating Quantum Efficiency for Photocatalytic CO_(2) Reduction

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第1期16卷 68-84页

作者： Kangwang wang Zhuofeng Hu Peifeng Yu Alina M.Balu kuan Li Longfu Li Lingyong Zeng Chao Zhang Rafael Luque Kai Yan Huixia Luo School of Materials Science and Engineering State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesKey Lab of Polymer Composite and Functional MaterialsSun Yat-Sen UniversityNo.135Xingang Xi RoadGuangzhou 510275People’s Republic of China School of Environmental Science and Engineering Sun Yat-Sen UniversityNo.135Xingang Xi RoadGuangzhou 510275People’s Republic of China Departamento de Química Orgánica Universidad de CórdobaCampus Universitario de RabanalesEdificio Marie Curie(C3)14014 CórdobaSpain Center for Refining and Advanced Chemicals King Fahd University of Petroleum and Minerals31261 DhahranSaudi Arabia Universidad ECOTEC Km 13.5 SamborondónEC092302 SamborondónEcuador

We report a novel double-shelled nanoboxes photocatalyst architecture with tailored interfaces that accelerate quantum efficiency for photocatalytic CO_(2) reduction reaction(CO_(2)RR)via Mo–S bridging bonds sites in S_(v)–In_(2)S_(3)@2H–MoTe_(2).The X-ray absorption near-edge structure shows that the formation of S_(v)–In_(2)S_(3)@2H–MoTe_(2) adjusts the coordination environment via interface engineering and forms Mo–S polarized sites at the *** interfacial dynamics and catalytic behavior are clearly revealed by ultrafast femtosecond transient absorption,time-resolved,and in situ diffuse reflectance–Infrared Fourier transform spectroscopy.A tunable electronic structure through steric interaction of Mo–S bridging bonds induces a 1.7-fold enhancement in S_(v)–In_(2)S_(3)@2H–MoTe_(2)(5)photogenerated carrier concentration relative to pristine S_(v)–In_(2)S_(3).Benefiting from lower carrier transport activation energy,an internal quantum efficiency of 94.01%at 380 nm was used for photocatalytic CO_(2)*** study proposes a new strategy to design photocatalyst through bridging sites to adjust the selectivity of photocatalytic CO_(2)RR.

关键词： Quantum efficiency Electronic structure Steric interaction Bridging sites CO_(2)reduction

Impacts of future climate change(2030-2059)on debris flow hazard:A case study in the Upper Minjiang River basin,China

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2018年第8期15卷 1836-1850页

作者： LI Ming TIAN Cong-shan wang Yu-kuan LIU Qin LU Ya-feng wang Shan Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 510041China University of Chinese Academy of Sciences Beijing 100049China Chengdu University of Technology Chengdu 610059China Chengdu Land Planning and Cadastre Center Chengdu 610074China

An increase in extreme precipitation events due to future climate change will have a decisive influence on the formation of debris flows in earthquake-stricken areas. This paper aimed to describe the possible impacts of future climate change on debris flow hazards in the Upper Minjiang River basin in Northwest Sichuan of China, which was severely affected by the 2008 Wenchuan earthquake. The study area was divided into 1285 catchments, which were used as the basic assessment units for debris flow hazards. Based on the current understanding of the causes of debris flows, a binary logistic regression model was used to screen key factors based on local geologic, geomorphologic, soil,vegetation, and meteorological and climatic conditions. We used the weighted summation method to obtain a composite index for debris flow hazards, based on two weight allocation methods: Relative Degree Analysis and rough set theory. Our results showed that the assessment model using the rough set theory resulted in better accuracy. According to the bias corrected and downscaled daily climate model data, future annual precipitation(2030-2059) in the study area are expected to decrease, with an increasing number of heavy rainfall events. Under future climate change, areas with a high-level of debris flow hazard will be even more dangerous, and 5.9% more of the study area was categorized as having a high-level hazard. Future climate change will cause an increase in debris flow hazard levels for 128 catchments, accounting for 10.5% of the total area. In the coming few decades, attention should be paid not only to traditional areas with high-level of debris flow hazards, but also to those areas with an increased hazard level to improve their resilience to debris flow disasters.

关键词： Debris flow Hazard assessment Relative degree analysis Rough set theory Future climate change Minjiang River basin

Agricultural opportunity costs assessment based on planting suitability:a case study in a mountain county in southwest China

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2017年第12期14卷 2568-2580页

作者： liu ju fu bin wang yu-kuan lu ya-feng xu pei institute of mountain hazards and environment chinese academy of sciencesChengdu 610041China key laboratory of environment change and resources use in beibu gulf(guangxi teachers education university) ministry of educationNanning 530001China wanzhou key regional ecology and environment monitoring station Chongqing 404020China

Payment for ecosystem services(PES) has become an increasingly popular means of ecosystem conservation. Opportunity cost is an important factor to increase the investment efficiency of PES ***, the distribution of opportunity cost is usually unclear in mountainous regions due to the obvious environment changes. In this study, we developed a framework to assess the distribution of agricultural opportunity costs in mountainous regions and applied this method to Baoxing County, a typical mountainous county in Sichuan Province of southwest China. Planting suitability of 17 crops was assessed based on agricultural statistics and natural conditions data within a GIS *** opportunity cost was quantified with a weighted summation of farmers' willingness to cultivate and each crop's opportunity cost. Finally,specific agricultural opportunity cost was obtained according to the spatial areas of the protection programs and land use status. The results showed that agricultural opportunity costs of PES in Baoxing County were estimated to be more than $30 million,with a mean of 400.85 $/ha. Agricultural opportunity costs in mountainous regions displayed some obvious spatial variation and areas with lower agricultural opportunity costs could be selected as priority areas for PES. Our findings revealed that the planting suitability evaluation can make agricultural opportunity costs mapping more reasonable. It will be helpful for the PES programs implementation in mountainous regions.

关键词： Opportunity cost Planting suitability Willingness to accept Ecosystem service Spatial variation Baoxing County

Rationally designing electrolyte additives for highly improving cyclability of LiNi_(0.5)Mn_(1.5)O_(4)/Graphite cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第4期91卷 266-275页

作者： Zhiyong Xia kuan Zhou Xiaoyan Lin Zhangyating Xie Qiurong Chen Xiaoqing Li Jie Cai Suli Li Hai wang Mengqing Xu Weishan Li School of Chemistry South China Normal UniversityGuangzhou 510006GuangdongChina China Zhuhai CosMX Battery Co. Ltd.Zhuhai 519180GuangdongChina National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs Engineering Research Center of MTEES(Ministry of Education)and Key Lab.of ETESPG(GHEI)South China Normal UniversityGuangzhou 510006GuangzhouChina

High voltage is necessary for high energy lithium-ion batteries but difficult to achieve because of the highly deteriorated cyclability of the batteries.A novel strategy is developed to extend cyclability of a high voltage lithium-ion battery,LiNi_(0.5)Mn_(1.5)O_(4)/Graphite(LNMO/Graphite)cell,which emphasizes a rational design of an electrolyte additive that can effectively construct protective interphases on anode and cathode and highly eliminate the effect of hydrogen fluoride(HF).5-Trifluoromethylpyridine-trime thyl lithium borate(LTFMP-TMB),is synthesized,featuring with *** anion TFMPTMB-tends to be enriched on cathode and can be preferentially oxidized yielding TMB and radical TFMP-.Both TMB and radical TFMP can combine HF and thus eliminate the detrimental effect of HF on cathode,while the TMB dragged on cathode thus takes a preferential oxidation and constructs a protective cathode *** the other hand,LTFMP-TMB is preferentially reduced on anode and constructs a protective anode ***,a small amount of LTFMP-TMB(0.2%)in 1.0 M LiPF6in EC/DEC/EMC(3/2/5,wt%)results in a highly improved cyclability of LNMO/Graphite cell,with the capacity retention enhanced from 52%to 80%after 150 cycles at 0.5 C between 3.5 and 4.8 *** as-developed strategy provides a model of designing electrolyte additives for improving cyclability of high voltage batteries.

关键词： Electrolyte additive Design and synthesis Cyclability High voltage batteries Cathode and anode interphases

Mirrorless MEMS imaging:a nonlinear vibrational approach utilizing aerosol-jetted PZT-actuated fiber MEMS scanner for microscale illumination

在线全文

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2024年第1期10卷 175-192页

作者： Wei-Chih wang Ming-Yao Li kuan-Chang Peng Yi-Feng Hsu Benjamin Estroff Pao-Yun Yen David Schipf Wen-Jong Wu Department of Power Mechanical Engineering National Tsing Hua UniversityNo.101Section 2Kuang-Fu RoadHsinchuTaiwan 30013China Institute of NanoEngineering and Microsystems National Tsing Hua UniversityNo.101Section 2Kuang-Fu RoadHsinchuTaiwan 30013China Department of Mechanical Engineering University of WashingtonSeattleWA 98195USA Department of Electrical Engineering University of WashingtonSeattleWA 98195USA Department of Engineering Science and Ocean Engineering National Taiwan UniversityTaiwanChina

This study introduces a novel image capture and lighting techniques using a cutting-edge hybrid MEMS scanner system designed for compact microscopic *** scanner comprises a tapered optical fiber waveguide and innovative aerosol-jet printed PZT(lead zirconate titanate)bimorph push-pull actuators on a stainless-steel substrate,effectively addressing issues that are commonly associated with PZT on silicon substrates such as fracture and layer *** leveraging nonlinear vibration,the scanner achieves a spiral scan pattern from a single signal input,in addition to the expected two-dimensional scanning and target illumination from two phase-shifted *** capability is further enhanced by a novel process to taper the optical fiber,which reduces illumination scattering and tunes the fiber to the resonant frequencies of the *** precisely tapered tip enables large fields of view while maintaining independent 2-axis scanning through one-degree-of-freedom *** validation showcases the successful generation of a spiral scan pattern with a 60μm diameter scan area and a 10 Hz frame rate,effectively reconstructing scanned images of 5μm lines,cross patterns(15μm in length with a 5μm gap),and structures of a Psychodidae wing.

关键词： steel fiber scanner

Optimized RNA interference therapeutics combined with interleukin-2 mRNA for treating hepatitis B virus infection

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

Signal Transduction and Targeted Therapy 2024年第7期9卷 3063-3076页

作者： Wenjing Zai Min Yang kuan Jiang Juan Guan Huijing wang Kongying Hu Chao Huang Jieliang Chen Wei Fu Changyou Zhan Zhenghong Yuan Key Laboratory of Medical Molecular Virology(MOE/NHC/CAMS) Research Unit of Cure of Chronic Hepatitis B Virus Infection(CAMS)Shanghai Frontiers Science Center of Pathogenic Microbes and InfectionSchool of Basic Medical SciencesShanghai Medical CollegeFudan UniversityShanghaiP.R.China Department of Pharmacology School of Basic Medical SciencesFudan UniversityShanghaiP.R.China Shanghai Engineering Research Center for Synthetic Immunology Fudan UniversityShanghaiP.R.China Eye Institute and Department of Ophthamology Eye and ENT HospitalFudan UniversityShanghaiP.R.China Pharmacy Department of Huashan Hospital Fudan UniversityShanghaiP.R.China Institute of Pediatric Translational Medicine Shanghai Institute for Pediatric Congenital Heart DiseaseShanghai Children’s Medical CenterSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina Shanghai Institute of Infectious Disease and Biosecurity ShanghaiP.R.China

This study aimed to develop a pan-genotypic and multifunctional small interfering RNA(siRNA)against hepatitis B virus(HBV)with an efficient delivery system for treating chronic hepatitis B(CHB),and explore combined RNA interference(RNAi)and immune modulatory modalities for better viral *** synthetic siRNAs targeting consensus motifs distributed across the whole HBV genome were designed and *** lipid nanoparticle(LNP)formulation was optimized by adopting HO-PEG_(2000)-DMG lipid and modifying the molar ratio of traditional polyethylene glycol(PEG)lipid in LNP *** efficacy and safety of this formulation in delivering siHBV(tLNP/siHBV)along with the mouse IL-2(mIL-2)mRNA(tLNP/siHBVIL2)were evaluated in the rAAVHBV1.3 mouse model.A siRNA combination(terms“siHBV”)with a genotypic coverage of 98.55%was selected,chemically modified,and encapsulated within an optimized LNP(tLNP)of high efficacy and security to fabricate a therapeutic formulation for *** results revealed that tLNP/siHBV significantly reduced the expression of viral antigens and DNA(up to 3log_(10)reduction;vs PBS)in dose-and time-dependent manners at single-dose or multi-dose frequencies,with satisfactory safety *** studies showed that tLNP/siHBVIL2 enables additive antigenic and immune control of the virus,via introducing potent HBsAg clearance through RNAi and triggering strong HBV-specific CD4^(+)and CD8^(+)T cell responses by expressed mIL-2 *** adopting tLNP as nucleic acid nanocarriers,the co-delivery of siHBV and mIL-2 mRNA enables synergistic antigenic and immune control of HBV,thus offering a promising translational therapeutic strategy for treating CHB.

关键词： formulation enable offering

掺杂(硅、锗、锡)单壁碳纳米管的第一性原理研究

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

材料导报 2022年第9期36卷 22-26页

作者：卢学峰王宽崔志红兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室兰州730050 兰州理工大学材料科学与工程学院兰州730050

使用第一性原理研究了纯(5,5)单壁碳纳米管(SWCNTs)和掺杂(Si,Ge,Sn)SWCNTs的电子结构和光学性质。研究发现,与其他体系的带隙值相比,Sn掺杂体系的带隙值最小,为0.034 eV,该体系显示出了良好的半导体性能。差分电荷密度图显示掺杂后原... 详细信息

使用第一性原理研究了纯(5,5)单壁碳纳米管(SWCNTs)和掺杂(Si,Ge,Sn)SWCNTs的电子结构和光学性质。研究发现,与其他体系的带隙值相比,Sn掺杂体系的带隙值最小,为0.034 eV,该体系显示出了良好的半导体性能。差分电荷密度图显示掺杂后原子周围的局域性降低,说明碳原子与掺杂原子之间的键强度减弱。布居值分析表明Sn原子与C原子成键的共价性最弱。在吸收光谱中,掺杂体系的峰值均略有减小,并出现蓝移现象。此外,与未掺杂体系相比,Sn掺杂体系的吸收谱与反射谱峰值明显减小,这可允许更多的光通过涂层然后被太阳能电池吸收,使其作为增透膜材料在太阳能电池领域有广阔的应用前景。

关键词：单壁碳纳米管第一性原理掺杂电子结构光学性能

An Assessment of Changes in Bioclimatic Types in Sichuan Province, 1961-2010

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2015年第1期12卷 145-153页

作者： LU Ya-feng LIU Yan-Qing XU Pei wang Yu-kuan LIU Yuan Institute of Mountain Hazards and Environment Chinese Academy of Sciences University of Chinese Academy of Sciences Foreign Economic Cooperation Office Ministry of Environmental Protection

Assessing the impact of climate change is important for ecosystem conservation and plant recovery, especially in climate sensitive *** studies suggested that the K?ppen classification is an effective method to depict climate change. However, these studies were restricted to large scales or of limited accuracy due to uncertainties in climate model projections. In addition, the impact of elevation on the shift of climate zones, as compared with other factors, is less emphasized. To address these issues we compiled the K?ppen Climate Classification(period 1961-2010) for the study area,Sichuan Province, China. The spatial resolution was selected as 1 km × 1 km. Sichuan Province may be characterized by 3 main climate classes and 10 subtypes. The east-west gradient of the climatic regimes in Sichuan is represented by the main climate classes, warm temperate climates(C), snow climates(D) and polar climates(E), at which the most abundant class is C. The most abundant subtype is snow climate with dry winter and cool summer(Dwc).Shifts in K?ppen climate classes reflect the observed trend of increasing temperature. Finally, the elevation showed an obvious impact on the distribution and the change of climate classes in Sichuan Province. Theshift of areas covered by K?ppen climate classes increases with elevation.

关键词：气候类型四川省评估生物气候变化气候分类空间分辨率生态系统

Microclimate regulation efficiency of the rural homegarden agroforestry system in the Western Sichuan Plain,China

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2019年第3期16卷 516-528页

作者： LIU Qin PENG Pei-hao wang Yu-kuan XU Pei GUO Ying-man College of Earth Sciences Chengdu University of Technology Institute of Mountain Hazards and Environment Chinese Academy of Sciences University of Chinese Academy of Sciences

Traditional rural homegarden agroforestry systems(referred to as homegarden) in the Western Sichuan Plain of China are often referred to as "Linpan" in Chinese. These homegardens are usually composed of farm houses, trees, bamboos, and small patches of land for flowers, fruits and vegetables. Over the Western Sichuan Plain’s area of approximately 18,800 km^2, there were more than 200,000 homegardens, accommodating 72.5% of the region’s rural population. As a unique local, cultural, and ecological resource, homegardens continuously support peasant households with provisioning, regulation, and landscape ecosystem services. This study combined low height remote sensing used unmanned aerial vehicle(UAV) photography, field investigation, and instrument monitoring. We try to identify the composition and structural characteristics of homegardens, as well as climatic regulation effects of the different types of homegardens. Temperature data were collected both for summer(June to August 2016) and winter(December 2016 to February 2017). The result shows that:(1) the average area of homegardens was 0.67 ha(sizes ranging from 0.16 ha to 1.24 ha), and with vegetation coverage 43.5%-76.9%(including 310 plant species).(2)In comparision with outside the homegardens, the average temperature inside the homegardens was significantly lower in summer(approximately 0.31 ℃-0.90 ℃). Although, the lowest summer temperature was differentiatee in between 13:30-16:00. Especially, the thermal effects of the home gardens were ranged from 2.00℃-2.65℃ at high temperatures(≥30℃).(3) The cooling effect of homegardens were positively correlated(pX_4>X_5>X_2>X_1.(4)This study indicates the major role of homegardens for climate regulation and energy efficiency, providing suggestions for homegarden transformation and constructio

关键词： Homegarden Linpan Western Sichuan Plain Climate regulation Energy saving and emission reduction