检索结果-南通市图书馆

biodiversity Assessment of Avifauna in the Forest Reservation of Aurora State College of Technology (ASCOT), Philippines

Open Journal of Ecology（生态学期刊） 2024年第4期 292页

作者： Afed S.Daiwey heherson b.ong Emerson V.barcellano Edmundo C.Gumpal Michelle Ann M.Calubaquib Rafael J.Padre

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Open Journal of Ecology 2024年第4期14卷 292-308页

作者： Afed S. Daiwey heherson b. ong Emerson V. barcellano Edmundo C. Gumpal Michelle Ann M. Calubaquib Rafael J. Padre School of Forestry and Environmental Sciences Aurora State College of Technology Baler Philippines College of Forestry and Environmental Science Isabela State University Cabagan Philippines College of Agriculture Isabela State University Cabagan Philippines College of Engineering Isabela State University Echague Philippines

The research study was conducted to assess and quantify the current status of avifauna biodiversity assets of Aurora State College of Technology’s Forest Reservation in baler, Aurora, Philippines. Assessment of avifaunal diversity was undertaken by traversing the four established circular plots having a radius of 125 meters or 250 meters diameters each as permanent monitoring stations. Study revealed a total number of 151 Individual species, classified into 23 genera and 21 families. Eighteen of these species are endemic while the remaining five were fully migrated birds. All birds observed were classified as Least Concern (LC) species according to the International Union for Conservation of Nature’s Red List of Threatened Species and the updated list of the birds of the World online. Its abundance, richness and diversity index were calculated using Shannon Diversity Index (H') while Pielou’s evenness (J') for distribution of species. Forest reservation of ASCOT has more even (0.756 J') and moderate diversity (2.812 H') observation on avifauna in general. However, this avian population evaluation was threatened into a verge of extinction due to natural and anthropological threats that causes forest deforestation. Such deforestation of habitat causes dwindling of wildlife territory leading to the scarcity of bird’s population. Thus, the assessment was conducted to aid ASCOT administration find significant plans to ensure sustainable conservation and protection of the remaining avifauna species in the reservation area.

关键词： biodiversity Avifauna Abundance Species Richness Species Diversity

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

基于有限元方法的回转窑燃烧器温度场仿真

高校应用数学学报（A辑） 2024年第1期39卷 51-63页

作者：赵莹常锦才梁精龙华北理工大学理学院河北唐山063210 华北理工大学冶金与能源学院河北唐山063210

为了实现回转窑在运行过程中其内部的温度分布情况的可视化,采用数值模拟的方法进行研究.基于有限元方法对回转窑燃烧器进行数值模拟,通过有限元Galerkin法Lagrange形函数推导出流体传热方程的弱形式,比较网格划分质量,应用COMSOL有限... 详细信息

为了实现回转窑在运行过程中其内部的温度分布情况的可视化,采用数值模拟的方法进行研究.基于有限元方法对回转窑燃烧器进行数值模拟,通过有限元Galerkin法Lagrange形函数推导出流体传热方程的弱形式,比较网格划分质量,应用COMSOL有限元软件实现套管式燃烧器燃烧仿真,结果显示燃烧器轴向10m内为回转窑高温区,温度保持在1400K-1800K,其他区域温度在1100K左右,仿真结果符合实际情况.多项式拟合煤气,空气进气与温度分布的关系,结果显示进气速度与窑内平均温度呈线性关系,与火焰区最高温度波动相关,回转窑燃烧器的温度场仿真为钢厂提高焙烧效率提供了科学依据,并为其他学者应用COMSOL软件进行仿真研究提供了可借鉴的模板.

关键词：燃烧器温度场有限元方法 Ritz-Galerkin法 COMSOL

大截面变化率对称结构管整体液力成形工艺研究

在线全文

学校读者我要写书评

暂无评论

塑性工程学报 2024年第4期31卷 227-233页

作者：解文龙刘鑫徐勇黄新越岳峰丽张士宏中国科学院金属研究所师昌绪先进材料创新中心辽宁沈阳110016 辽宁科技大学机械工程与自动化学院辽宁鞍山114051 沈阳多元机电设备有限公司辽宁沈阳110000 沈阳理工大学汽车与交通学院辽宁沈阳110159

为解决某汽车排气尾管一体化成形中成形道次多的制造问题,提出了与传统压扁特征处对称结构(A型)设计思路不同的圆截面处对称结构(b型),并采用液力成形工艺对其进行成形,通过对比成形道次和零件质量,分析了两种对称结构工件成形的优缺点... 详细信息

为解决某汽车排气尾管一体化成形中成形道次多的制造问题,提出了与传统压扁特征处对称结构(A型)设计思路不同的圆截面处对称结构(b型),并采用液力成形工艺对其进行成形,通过对比成形道次和零件质量,分析了两种对称结构工件成形的优缺点。研究发现,由于A型结构工件一道次成形时圆角处会出现裂纹,需采用多工步成形才能实现;而b型结构工件一道次成形效果良好;经多工步成形的A型结构工件和一道次成形的b型结构工件最大壁厚减薄率均小于25%。但是,与A型对称结构工件相比,b型对称结构工件圆角处壁厚减薄率更低,成形效果更好,并且模具数量由3套减少为1套。通过合理的零件结构设计,该结构打破了传统圆形截面端部密封的设计束缚,不仅有效降低了模具成本,还提高了生产效率,大幅提高了零件成形效果。

关键词：液压成形液力成形大截面变化率结构设计

Optimum calibration of a parallel kinematic manipulator using digital indicators

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2014年第3期2卷 222-230页

作者： V.b.Saputra S.K.ong A.Y.C.Nee Department of Mechanical Engineering Faculty of EngineeringNational University of SingaporeSingapore 117576Singapore

This paper presents a calibration method for parallel manipulators using a measurement system specially installed on an external fixed frame. The external fixed frame is important as an error reference for calibration in certain operations, such as in the configuration of a parallel manip- ulator functioning as a machine tool where the workpiece is fixed to a worktable. The pose of the end-effector is mea- sured using three digital indicators installed on the external fixed frame. To enable measurement, the end-effector is assumed to be a plane large enough that all digital indicators could touch. The error is defined as the difference between the theoretical and actual readings of the digital indicators. The geometric parameters of the parallel manipulator are optimized to minimize this error. This calibration method is low cost and feasible for compensating geometric parameter errors for a parallel manipulator. Optimal pose selection for the calibration is achieved using a swarm intelligence search algorithm. The method is implemented on a prototype of a six degrees-of-freedom （DOFs） Gough-Stewart platform constructed to function as a machine tool.

关键词： Calibration Parallel kinematic manipulator(PKM) Digital indicator

碳载PtCu催化剂的制备及对甲醇的电催化氧化性能研究

在线全文

学校读者我要写书评

暂无评论

炭素技术 2024年第2期43卷 23-27,75页

作者：赵洪波白晓波郎德龙绥化学院食品与制药工程学院黑龙江省环境催化与储能材料重点实验室黑龙江绥化152061

以L-抗坏血酸(VC)为还原剂通过微波辅助法在乙二醇(EG)体系中制备了不同原子比的碳载PtCu纳米催化剂,运用循环伏安法、计时电流法、X射线粉末衍射仪(XRD)、场发射扫描电子显微镜(FESEM)等方法和手段,对催化剂在酸性甲醇溶液中的电催化... 详细信息

以L-抗坏血酸(VC)为还原剂通过微波辅助法在乙二醇(EG)体系中制备了不同原子比的碳载PtCu纳米催化剂,运用循环伏安法、计时电流法、X射线粉末衍射仪(XRD)、场发射扫描电子显微镜(FESEM)等方法和手段,对催化剂在酸性甲醇溶液中的电催化活性、稳定性、结构和形貌进行了研究。电化学测试结果表明,在pH=5时进行还原的Pt、Cu原子比为1∶1的PtCu/C催化剂活性最高,稳定性最好。表征后发现该催化剂粒径最小,比表面积最大,并且分布均匀,与测试结果一致,即对甲醇的氧化具有优异的电催化性能。在降低铂基催化剂成本和提高催化剂活性方面具有一定的价值。

关键词：燃料电池乙二醇 VC 甲醇电催化氧化碳载PtCu催化剂

Identification of novel small-molecule inhibitors of SARS-CoV-2 by chemical genetics

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica b 2024年第9期14卷 4028-4044页

作者： Chris Chun-Yiu Chan Qian Guo Jasper Fuk-Woo Chan Kaiming Tang Jian-Piao Cai Kenn Ka-Heng Chik Yixin Huang Mei Dai bo Qin Chon Phin ong Allen Wing-Ho Chu Wan-Mui Chan Jonathan Daniel Ip Lei Wen Jessica Oi-Ling Tsang Tong-Yun Wang Yubin Xie Zhenzhi Qin Jianli Cao Zi-Wei Ye Hin Chu Kelvin Kai-Wang To Xing-Yi Ge Tao Ni Dong-Yan Jin Sheng Cui Kwok-Yung Yuen Shuofeng Yuan State Key Laboratory of Emerging Infectious Diseases Carol Yu Centre for InfectionDepartment of MicrobiologySchool of Clinical MedicineLi Ka Shing Faculty of Medicinethe University of Hong KongPokfulamHong Kong SAR 999077China Department of Infectious Diseases and Microbiology the University of Hong Kong-Shenzhen HospitalShenzhen 518000China Centre for Virology Vaccinology and TherapeuticsHong Kong Science and Technology ParkHong Kong SAR 999077China Academician Workstation of Hainan Province Hainan Medical University-the University of Hong Kong Joint Laboratory of Tropical Infectious DiseasesHaikou 571100China School of biomedical Sciences Li Ka Shing Faculty of Medicinethe University of Hong KongPokfulamHong Kong SAR 999077China NHC Key Laboratory of Systems biology of Pathogens Institute of Pathogen Biology Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China College of biology Hunan Provincial Key Laboratory of Medical VirologyHunan UniversityChangsha 410082China

There are only eight approved small molecule antiviral drugs for treating *** them,four are nucleotide analogues(remdesivir,JT001,molnupiravir,and azvudine),while the other four are protease inhibitors(nirmatrelvir,ensitrelvir,leritrelvir,and simnotrelvir-ritonavir).Antiviral resistance,unfavourable drug‒drug interaction,and toxicity have been reported in previous *** there is a dearth of new treatment options for *** this work,a three-tier cell-based screening was employed to identify novel compounds with anti-SARS-CoV-2 *** compound,designated 172,demonstrated broad-spectrum antiviral activity against multiple human pathogenic coronaviruses and different SARS-CoV-2 variants of *** studies validated by reverse genetics showed that compound 172 inhibits the 3-chymotrypsin-like protease(3CLpro)by binding to an allosteric site and reduces 3CLpro dimerization.A drug synergistic checkerboard assay demonstrated that compound 172 can achieve drug synergy with nirmatrelvir in *** vivo studies confirmed the antiviral activity of compound 172 in both Golden Syrian Hamsters and K18 humanized ACE2 ***,this study identified an alternative druggable site on the SARS-CoV-23CLpro,proposed a potential combination therapy with nirmatrelvir to reduce the risk of antiviral resistance and shed light on the development of allosteric protease inhibitors for treating a range of coronavirus diseases.

关键词： SARS-CoV-2 High throughput screening broad-spectrum antiviral treatment 3CLpro inhibitor Allosteric-site inhibitor Animal models Chemical genetics Reverse genetics

Smart Semi-active PID-ACO control strategy for tower vibration reduction in Wind Turbines with MR damper

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

Earthquake Engineering and Engineering Vibration 2019年第4期18卷 887-902页

作者： Mahmudur Rahman Zhi Chao ong Wen Tong Chong Sabariah Julai Department of Mechanical Engineering Faculty of Engineering University of Malaya

Wind turbine technology is well known around the globe as an eco-friendly and eff ective renewable power source. However, this technology often faces reliability problems due to structural vibration. This study proposes a smart semi-active vibration control system using Magnetorheological (MR) dampers where feedback controllers are optimized with nature-inspired algorithms. Proportional integral derivative (PID) and Proportional integral (PI) controllers are designed to achieve the optimal desired force and current input for MR the damper. PID control parameters are optimized using an Ant colony optimization (ACO) algorithm. The eff ectiveness of the ACO algorithm is validated by comparing its performance with Ziegler-Nichols (Z-N) and particle swarm optimization (PSO). The placement of the MR damper on the tower is also investigated to ensure structural balance and optimal desired force from the MR damper. The simulation results show that the proposed semi-active PID-ACO control strategy can signifi cantly reduce vibration on the wind turbine tower under diff erent frequencies (i.e., 67%, 73%, 79% and 34.4% at 2 Hz, 3 Hz, 4.6 Hz and 6 Hz, respectively) and amplitudes (i.e. 50%, 58% and 67% for 50 N, 80 N, and 100 N, respectively). In this study, the simulation model is validated with an experimental study in terms of natural frequency, mode shape and uncontrolled response at the 1st mode. The proposed PID-ACO control strategy and optimal MR damper position is also implemented on a lab-scaled wind turbine tower model. The results show that the vibration reduction rate is 66% and 73% in the experimental and simulation study, respectively, at the 1st mode.

关键词： ant colony optimization fi nite diff erence method magnetorheological damper PID-ACO controller semiactive control system identifi cation wind turbine tower

Insights into electrochemical nitrogen reduction reaction mechanisms:Combined effect of single transition-metal and boron atom

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第7期30卷 577-585页

作者： Xingzhu Chen Wee-Jun ong Xiujian Zhao Peng Zhang Neng Li State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070HubeiChina School of Energy and Chemical Engineering Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia College of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005FujianChina State Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina Shenzhen Research Institute of Wuhan University of Technology Shenzhen 518000GuangdongChina

Developing single-atom catalysts(SACs) for electrochemical devices is a frontier in energy *** comparison of stability,activity and selectivity between various single atoms is one of the main research focuses in ***,the in-depth understanding of the role that the coordination atoms of single atom play in the catalytic process is ***,we proposed a graphene-like boroncarbon-nitride(bCN) monolayer as the support of single metal *** electrocatalytic nitrogen reduction reaction(eNRR) performances of 3 d,4 d transition metal(TM) atoms embedded in defective bCN were systematically investigated by means of density functional theory(DFT) *** study shows that the TM-to-N and b-to-N π-back bonding can contribute to the activation of N_(2).Importantly,a combined effect is revealed between single TM atom and boron atom on eNRR:TM atom enhances the nitrogen reduction process especially in facilitating the N_(2) adsorption and the NH3 desorption,while boron atom modulates the bonding strength of key intermediates by balancing the charged ***,Nb@bN3 possesses the highest electrocata lytic activity with limiting potential of-0.49 V,and exhibits a high selectivity for nitrogen reduction reaction(NRR) to ammonia compared with hydrogen evolution reaction(HER).As such,this work can stimulate a research doorway for designing multi-active sites of the anchored single atoms and the innate atoms of substrate based on the mechanistic insights to guide future eNRR research.

关键词： boron-carbon–nitrogen(bCN) Single-atom catalysts Electrocatalytic nitrogen reduction reaction Density functional theory Combined effect

Synthesis and mesomorphic properties of Schiff base esters possessing terminal chloro substituent

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2010年第6期21卷 637-640页

作者： Sie Tiong Ha Lay Khoon ong Siew Ling Lee Hong Cheu Lin Yip Foo Win Siew Teng ong Department of Chemical Science Faculty of ScienceUniversiti Tunku Abdul RahmanJln UniversitiBandar Barat31900 KamparPerakMalaysia Department of Science Faculty of Engineering & ScienceUniversiti Tunku Abdul RahmanJln Genting KlangSetapak53300 Kuala LumpurMalaysia Ibnu Sina Institute for Fundamental Science Studies Universiti Teknologi Malaysia81310 UTM SkudaiJohorMalaysia Department of Materials Science & Engineering National Chiao Tung UniversityHsinchu 300TaiwanChina

A homologous series of Schiff base esters,4-chlorobenzylidene-4'-n-alkanoyloxyanilines,containing even number of carbons at the end groups of the molecules(C_(n-1)H_(2n-1)COO-,n=4,6,8,10,12,14,16) were *** mesomorphic properties were investigated by differential scanning calorimetry(DSC) and polarizing optical microscopy(POM).It was found that the end groups of the molecules had an effect on the mesomorphic properties.n-butanoyloxy was found non-mesogenic,whilst n-hexanoyloxy exhibited monotropic smectic *** higher members in this homologous series were enantiotropic smectogens.

关键词： Schiff base esters Smectic A Smectic b Liquid crystal