检索结果-南通市图书馆

第三世界生态高峰会

作者： RITA s.W.YAM MATTIe O'HARe MIKe DUNBAR ANNeTTe BAATTRUP-PeDeRseN s ren e.larsen Centre for ecology & Hydrology Macleam Builling Crowmarsh Gifford Wallingford Oxfordshire OX10 8BB.U.K. Centre for ecology & Hydrology Winfrith Technology Centre Dorchester.DT2 8ZD Dorset U.K. Centre for ecology & Hydrology Maclean Building Crowmarsh Gifford Wallingford.Oxfordshire OX10 8BB.U.K. Department of Freshwater Biology National environmental Research Institute VejlsΦvej 25 P.O.Box 314 DK-8600 silkeborg.Denmark. Department of Freshwater Biology National environmental Research Institute VejlsΦvej 25 P.O.Box 314 DK-8600 silkeborg.Denmark.

We investigated the quantitative relationship between macrophyte community structure and hydromorphology in 648 rivers in the United Kingdom （UK）.Geographical information,geological features,channel morphology,flow pattern and degree of habitat modification were included to characterize the hydromorphology at each *** analysis,partial least squares projection to latent structures （PLs）, revealed a positive correlation between floristic （abundance and species richness） and hydromorphological variables （p＜0.005）.Depth of channel,substrate type and flow habitat type played significant roles on shaping the community structure of *** communities varied between the gradient of two main types of sites: type 1 was characterised by small-sized mountain rivers with variable flow regime whereas type 2 was characterised by large-sized lowland rivers with deeper and wider channel,and higher and more stable flows Dominant species differ between unimpacted and impacted rivers （defined in term of habitat modification and eutrophication）.seventeen macrophyte species were identified as indicators for different hydromorphological environments in *** these indicator species,submerged and emergent species were dominant over （＞40%） amphibious *** PLs model is sufficiently sensitive （cross validation:Q＞0.4,p＜0.05） to be used in the management of river macrophyte *** can predict the macrophyte communities from hydromorphological variables in rivers,and assess the ecological impacts into five classes based on the ordinal measure of *** impact of physical alteration on macrophyte communities can therefore be quantified from the *** implications of this work on monitoring river health are discussed.

关键词： TIle ReLATIONsHIP BeTWeeN HYDROMORPHOLOGY AND MACROPHYTe COMMUNITY sTRUCTURe IN UK-IMPLICATIONs FOR eCOLOGICAL AssessMeNT

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

event-triggered H_(∞) consensus control for input-constrained multi-agent systems via reinforcement learning

引用

Control Theory and Technology 2024年第1期22卷 25-38页

作者： Jinxuan Zhang Chang-e ren College of Information engineering Capital Normal UniversityBeijing100089China

This article presents an event-triggered H_(∞) consensus control scheme using reinforcement learning (RL) for nonlinear second-order multi-agent systems (MAss) with control constraints. First, considering control constraints, the constrained H_(∞) consensus problem is transformed into a multi-player zero-sum game with non-quadratic performance functions. Then, an event-triggered control method is presented to conserve communication resources and a new triggering condition is developed for each agent to make the triggering threshold independent of the disturbance attenuation level. To derive the optimal controller that can minimize the cost function in the case of worst disturbance, a constrained Hamilton–Jacobi–Bellman (HJB) equation is defined. since it is difficult to solve analytically due to its strongly non-linearity, reinforcement learning (RL) is implemented to obtain the optimal controller. In specific, the optimal performance function and the worst-case disturbance are approximated by a time-triggered critic network;meanwhile, the optimal controller is approximated by event-triggered actor network. After that, Lyapunov analysis is utilized to prove the uniformly ultimately bounded (UUB) stability of the system and that the network weight errors are UUB. Finally, a simulation example is utilized to demonstrate the effectiveness of the control strategy provided.

关键词： H_(∞)optimal control Input constrains Multi-agent systems(MAss) Reinforcement learning(RL)

来源：

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

丹麦治理水环境营养负荷的成就(英文)

丹麦治理水环境营养负荷的成就(英文)

引用

2009水资源与可持续发展高层论坛

作者： Brian Kronvang Jφrgen Windolf Ruth Grant Hans e.Andersen Hans Thodsen Niels B.Ovesen sφren e.larsen National environmental Research Institute AarhusAarhus UniversityVejlsΦvej25Silkeborg DK-8600Denmark National environmental Research Institute Aarhus

＜正＞Nationwide monitoring of the aquatic environment was initiated in 1988 in Denmark as a mean to follow the outcome of the Action Plans for nutrient pollution of the aquatic *** Action Plans have been adopted by the Danish Parliament since 1985 and the nationwide monitoring program can be used to quantify the outcome as shown by reductions in nutrient discharges from both point and non-point ***,the empirical experience gathered from nearly 20 years of monitoring is assisting the development and calibration of models for simulation of nitrogen leaching,nitrogen removal in groundwater and surface waters and the establishment of a P-index all covering the entire land area of Denmark.

关键词： Nitrogen phosphorus monitoring data point sources non-point sources models Action Plans Danish experience

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Accuracy comparison and improvement for state of health estimation of lithium-ion battery based on random partial recharges and feature engineering

引用

Journal of energy Chemistry 2024年第5期92卷 591-604页

作者： Xingjun Li Dan Yu søren Byg Vilsen Daniel Ioan stroe Department of energy Aalborg UniversityAalborg 9220Denmark Department of Mathematical sciences Aalborg UniversityAalborg 9220Denmark Walker Department of Mechanical engineering The University of Texas at AustinAustinTX 78712USA

state of health(sOH)estimation of e-mobilities operated in real and dynamic conditions is essential and *** of existing estimations are based on a fixed constant current charging and discharging aging profiles,which overlooked the fact that the charging and discharging profiles are random and not complete in real *** work investigates the influence of feature engineering on the accuracy of different machine learning(ML)-based sOH estimations acting on different recharging sub-profiles where a realistic battery mission profile is *** features were extracted from the battery partial recharging profiles,considering different factors such as starting voltage values,charge amount,and charging sliding ***,features were selected based on a feature selection pipeline consisting of filtering and supervised ML-based subset *** linear regression(MLR),Gaussian process regression(GPR),and support vector regression(sVR)were applied to estimate sOH,and root mean square error(RMse)was used to evaluate and compare the estimation *** results showed that the feature selection pipeline can improve sOH estimation accuracy by 55.05%,2.57%,and 2.82%for MLR,GPR and sVR *** was demonstrated that the estimation based on partial charging profiles with lower starting voltage,large charge,and large sliding window size is more likely to achieve higher *** work hopes to give some insights into the supervised ML-based feature engineering acting on random partial recharges on sOH estimation performance and tries to fill the gap of effective sOH estimation between theoretical study and real dynamic application.

关键词： Feature engineering Dynamic forklift aging profile state of health comparison Machine learning Lithium-ion batteries

来源：

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

Metal-Organic Frameworks Housing Active Molecules as Bioinspired Catalysts

引用

CCs Chemistry 2024年第6期6卷 1380-1402页

作者： Yin Zhang Peter e.VanNatta Junyu ren shengqian Ma Department of Chemistry University of North TexasDentonTexas 76201 Department of Chemical and Biomolecular engineering National University of SingaporeSingapore 117585

Optimization of activity,selectivity,and stability of catalysts for practical application is a long-soughtafter *** progress in the advancement of rational catalyst design routinely takes queues from ***,enzymes are renowned for their high efficiency and selectivity in diverse and significant reactions under mild *** the well-known merits of enzymes,they often remain unsuitable for industrial catalysis due to issues,including limited environment(solvent/temperature/pH)compatibility,considerable structural uncertainty,and highly specific reaction *** the context of bioinspired catalysis design,the development of synthetic heterogeneous catalyst analogs,which may not only mimic enzymes to reproduce or even surpass their performance but also bypass their intrinsic limitations,is thus,desirable and has been extensively studied in the context of porous *** metal-organic framework(MOF)is a superior candidate for porous materials towards this goal,thanks to facile and modular preparation,explicit crystalline composition/structure,tunable pore size/environment,and excellent *** introduction of active molecular species such as bioactive molecules(e.g.,proteins,enzymes,peptides,amino acids,porphyrins)and chemically active molecules(e.g.,frustrated Lewis pairs)into metal-organic frameworks(MOFs)via pore encapsulation,chemical postmodification,or bottom-up construction has been shown to facilitate the cooperative enhancement of catalysis through the enforcement of proximity,enhancement of control/activity,and even inducement of unexpected *** this minireview,we sought to summarize the last 5 years of fruitful progress,exploiting MOFs housing active molecules for substantial catalysis applications,including asymmetric reactions,CO_(2)conversion(reduction,cycloaddition),biocatalytic H_(2)O_(2)/dye degradation,and so on,and discuss challenges and opportunities in the prospective exploration of these system

关键词： metal-organic framework bioinspired catalyst active molecular species

来源：

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

Finite-size-induced non-Hermitian phase transitions in real space

引用

science China(Physics,Mechanics & Astronomy) 2024年第11期67卷 105-111页

作者： Hongfei Wang Biye Xie Wei ren Department of Physics International Center for Quantum and Molecular StructuresShanghai UniversityShanghai 200444China school of science and engineering The Chinese University of Hong KongShenzhen 518172China

While non-Hermiticity provokes intriguing phenomena without Hermitian counterparts, e.g., the skin effect and the breakdown of bulk-boundary correspondence, attracting extensive attention both in fundamental physics and device engineering, the role of finite sizes therein remains elusive. Here, we propose a class of finite-size-induced non-Hermitian phase transitions, relying upon higher-order topological invariants associated with real-space wave functions. The phase diagrams for general non-Hermitian chiral models are further acquired to demonstrate our topological definition. such phase transitions are elucidated qualitatively by an effective intercell coupling alteration that depends on finite sizes in respective directions. Besides, we mimic these phenomena by analogizing the circuit Laplacian in finite-size electric circuits with nonreciprocal couplings. The resultant admittance spectra agree with our theoretical predictions. Our findings shed light on the finite-size mechanism of non-Hermitian topological phase transitions and pave the way for applications in switching and sensing.

关键词： non-Hermitian phase transitions finite-size effects higher-order topological invariants

来源：

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

Perfluorinated iodine alkanes promote the differentiation of mouse embryonic stem cells by regulating estrogen receptor signaling

引用

Journal of environmental sciences 2024年第3期137卷 443-454页

作者： Zhihua ren Xiaoxi Yang Tingting Ku Qian s.Liu Jiefeng Liang Qunfang Zhou Francesco Faiola Guibin Jiang state Key Laboratory of environmental Chemistry and ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Resources and environment University of Chinese Academy of SciencesBeijing 100049China College of environment and Resource Research Center of Environment and HealthShanxi UniversityTaiyuan 030006China College of sino-Danish University of Chinese Academy of SciencesBeijing 100049China

Investigating the development toxicity of perfuorinated iodine alkanes(PFIs)is critical,given their estrogenic effects through binding with estrogen receptors(eRs).In the present study,two PFIs,including dodecafuoro-1,6-diiodohexane(PFHx DI)and tridecafuorohexyl iodide(PFHx I),with binding preference to eRαand eRβ,respectively,were selected to evaluate their effects on proliferation and differentiation of the mouse embryonic stem cells(m esCs).The results revealed that,similar to e_(2),50μmol/L PFHx DI accelerated the cell proliferation of the m *** PFI stimulation at the exposure concentrations of 2–50μmol/L promoted the differentiation of the m esCs as characterized by the upregulation of differentiation-related biomarkers(i.e.,Otx2 and Dnmt3β)and downregulation of pluripotency genes(i.e.,Oct4,Nanog,sox2,Prdm14 and Rex1).Comparatively,PFHx DI exhibited higher induction effect on the differentiation of the m esCs than did PFHx *** tests on eR signaling indicated that both PFI compounds induced exposure concentration-dependent expressions of eR signaling-related biomarkers(i.e.,eRα,eRβand Caveolin-1)in the m esCs,and the downstream eR responsive genes(i.e.,c-fos,c-myc and c-jun)well responded to PFHx I *** role of eR in PFI-induced effects on the m esCs was further validated by the antagonistic experiments using an eR inhibitor(ICI).The findings demonstrated that PFIs triggered eR signaling,and perturbed the differentiation program of the m esCs,causing the potential health risk during early stage of development.

关键词： Perfuorinated iodine alkanes(PFIs) embryonic stem cells(esCs) Developmental toxicity Cell differentiation estrogen receptor-related signaling

来源：

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

Optimization Control of Multi-Mode Coupling All-Wheel Drive system for Hybrid Vehicle

引用

Chinese Journal of Mechanical engineering 2024年第2期37卷 340-355页

作者： Lipeng Zhang Zijian Wang Liandong Wang Changan ren school of Vehicle and energy Yanshan UniversityQinhuangdao 066004China

The all-wheel drive(AWD)hybrid system is a research focus on high-performance new energy vehicles that can meet the demands of dynamic performance and passing *** optimization of the power and economy of hybrid vehicles becomes an issue.A unique multi-mode coupling(MMC)AWD hybrid system is presented to realize the distributed and centralized driving of the front and rear axles to achieve vectored distribution and full utilization of the system power between the axles of *** on the parameters of the benchmarking model of a hybrid vehicle,the best model-predictive control-based energy management strategy is ***,the drive system model was built after the analysis of the MMC-AWD’s drive ***,three fundamental strategies were established to address power distribution adjustment and battery sOC maintenance when the sOC changed,which was followed by the design of a road driving force ***,the energy consumption rate in the average time domain was processed before designing the minimum fuel consumption controller based on the equivalent fuel consumption ***,the advantage of the MMC-AWD was confirmed by comparison with the dynamic performance and economy of the BYD song PLUs *** findings indicate that,in comparison to the comparative hybrid system at road adhesion coefficients of 0.8 and 0.6,the MMC-AWD’s capacity to accelerate increases by 5.26%and 7.92%,*** the road adhesion coefficient is 0.8,0.6,and 0.4,the maximum climbing ability increases by 14.22%,12.88%,and 4.55%,*** a result,the dynamic performance is greatly enhanced,and the fuel savings rate per 100 km of mileage reaches 12.06%,which is also very *** proposed control strategies for the new hybrid AWD vehicle can optimize the power and economy simultaneously.

关键词： Hybrid vehicle All-wheel drive Multi-mode coupling energy management Model predictive control

来源：

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

AIMP2 restricts eV71 replication by recruiting sMURF2 to promote the degradation of 3D polymerase

引用

Virologica sinica 2024年第4期39卷 632-644页

作者： Junrui ren Lei Yu Qiuhan Zhang Pengyu ren Yumeng Cai Xueyun Wang Ke Lan shuwen Wu state Key Laboratory of Virology College of Life SciencesWuhan UniversityWuhan430072China Medical Research Institute Wuhan UniversityWuhan430072China Taikang Center for Life and Medical sciences Wuhan UniversityWuhan430072China

Hand,foot and mouth disease(HFMD),mainly caused by enterovirus 71(eV71),has frequently occurred in the Asia-Pacific region,posing a significant threat to the health of infants and young ***,research on the infection mechanism and pathogenicity of enteroviruses is increasingly becoming *** 3D polymerase,as the most critical RNA-dependent RNA polymerase(RdRp)for eV71 replication,is widely targeted to inhibit eV71 *** this study,we identified a novel host protein,AIMP2,capable of binding to 3D polymerase and inhibiting eV71 *** investigations revealed that AIMP2 recruits the e3 ligase sMURF2,which mediates the polyubiquitination and degradation of 3D ***,the antiviral effect of AIMP2 extended to the CVA16 and CVB1 *** research has uncovered the dynamic regulatory function of AIMP2 during eV71 infection,revealing a novel antiviral mechanism and providing new insights for the development of antienteroviral therapeutic strategies.

关键词： AIMP2 enterovirus 71(eV71) 3D polymerase e3 ligase sMURF2 Ubiquitination

来源：

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

Afforestation increases microbial diversity in low-carbon soils

引用

Journal of Forestry Research 2024年第2期35卷 14-22页

作者： Xuesen Pang Chuankuan Wang Chengjie ren Zhenghu Zhou Center for ecological Research Key Laboratory of Sustainable Forest Ecosystem Management‑Ministry of EducationNortheast Forestry UniversityHarbin 150040People’s Republic of China Northeast Asia Biodiversity Research Center Northeast Forestry UniversityHarbin 150040People’s Republic of China state Key Laboratory of soil erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYangling 712100People’s Republic of China

Afforestation has an important role in biodiversity conservation and ecosystem function improvement.A meta-analysis was carried out in China,which has the largest plantation area globally,to quantify the effects of plantings on soil microbial *** results showed that the overall effect of afforestation on soil microbial diversity was positive across the *** forest algorithm suggested that soil carbon was the most important factor regulating microbial diversity and the positive response was only found with new plantings on low-carbon bare lands but not on high-carbon farmlands and *** addition,afforestation with broadleaved species increased microbial diversity,whereas planting with conifers had no effect on microbial *** study clarified the effects of plantings on soil microbial diversity,which has an important implication for establishing appropriate policies and practices to improve the multiple functionalities(e.g.,biodiversity conservation and climate change mitigation)during plantation establishment.

关键词： Afforestation Microbial diversity soil microbial communities species-energy theory Plantations

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：