检索结果-南通市图书馆

Wild dogma： An examination of recent ＂evidence＂ for dingo regulation of invasive mesopredator release in Australia

Current Zoology 2011年第5期57卷 568-583页

作者： Benjamin l. AllEN Richard M. ENGEMAN lee R. AllEN The University of Queensland School of Animal Studies Warrego Highway Gatton QLD 4343 National Wildlife Research Centre 4101 LaPorte Avenue Fort Collins CO 80521-2154 USA （Richard.M.Engeman@aphis.usda.gov） Biosecurity Queensland Robert Wicks Pest Animal Research Centre Tor Street Toowoomba QLD 4350 （Lee.Allen@deedi.qld.gov.au）

There is growing interest in the role that apex predators play in shaping terrestrial ecosystems and maintaining tro- phic cascades. In line with the mesopredator release hypothesis, Australian dingoes （Canis lupus dingo and hybrids） are assumed by many to regulate the abundance of invasive mesopredators, such as red foxes Vulpes vulpes and feral cats Fells catus, thereby providing indirect benefits to various threatened vertebrates. Several recent papers have claimed to provide evidence for the bio- diversity benefits of dingoes in this way. Nevertheless, in this paper we highlight several critical weaknesses in the methodologi- cal approaches used in many of these reports, including lack of consideration for seasonal and habitat differences in activity, the complication of simple track-based indices by incorporating difficult-to-meet assumptions, and a reduction in sensitivity for as-sessing populations by using binary measures rather than potentially continuous measures. Of the 20 studies reviewed, 15 of them （75%） contained serious methodological flaws, which may partly explain the inconclusive nature of the literature investigating interactions between invasive Australian predators. We therefore assert that most of the ＂growing body of evidence＂ for meso- predator release is merely an inconclusive growing body of literature only. We encourage those interested in studying the eco- logical roles of dingoes relative to invasive mesopredators and native prey species to account for the factors we identify, and cau- tion the value of studies that have not done so [Current Zoology 57 （5）： 568-583, 2011].

关键词： Activity index Apex predator Canis lupus dingo Experimental design Mesopredator release Sampling

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

高尿酸血症小鼠模型构建及其对肠屏障损伤的影响

引用

青岛大学学报（医学版） 2024年第4期60卷 508-512页

作者：朱现菊吕秋兰胡鹤鸣青岛市第八人民医院检验科山东青岛266000 青岛大学附属医院医学研究中心

目的构建稳定的肠屏障损伤高尿酸血症小鼠模型。方法采用不同浓度腺嘌呤(Ade)和氧嗪酸钾(PO)灌胃小鼠,分别在第3、7、14和21天检测血清尿酸、尿素氮、肌酐水平和肠渗透性,检测空肠、回肠和结肠中紧密连接蛋白Occludin、ZO-1和Claudin-1... 详细信息

目的构建稳定的肠屏障损伤高尿酸血症小鼠模型。方法采用不同浓度腺嘌呤(Ade)和氧嗪酸钾(PO)灌胃小鼠,分别在第3、7、14和21天检测血清尿酸、尿素氮、肌酐水平和肠渗透性,检测空肠、回肠和结肠中紧密连接蛋白Occludin、ZO-1和Claudin-1的表达。结果高浓度的Ade和PO导致小鼠尿酸升高(F=25.453~518.039,Pludin和ZO-1在高尿酸血症小鼠回肠和结肠中表达降低(t=3.164、3.678,Plaudin-1在空肠中表达降低(t=2.670,P<0.05)。结论采用50mg/kgAde和125mg/kgPO连续灌胃7d可构建肠屏障损伤的高尿酸血症小鼠模型。

关键词：高尿酸血症肠容积渗克分子浓度疾病模型,动物

来源：

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Implementation of Caterpillar Inspired Rolling Gait and Nonlinear Control Strategy in a Spherical Robot

引用

Journal of Bionic Engineering 2018年第2期15卷 313-328页

作者： Abhra Roy Chowdhury Gim Song Soh Shaohui Foong Kristin l. Wood Temasek laboratories Engineering Product Development Pillar Singapore University of Technology and Design Singapore 487372 SUTD-MIT International Design Centre Singapore University of Technology and Design Singapore 487372

This paper presents a novel Central Pattern Generator （CPG） based rolling gait generation in a small-sized spherical robot and its nonlinear control mechanism. A rhythmic rolling pattern mimicking Pleurotya caterpillar is produced for the spherical robot locomotion. A synergetically combined feedforward-feedback control strategy is proposed. The feedforward component is generated from centrally connected network of CPGs in conjunction with nonlinear robot dynamics. Two nonlinear feedback control methods namely integral （first order） Sliding Mode Control （SMC） and High （or second） Order Sliding Mode Control （HOSMC） are proposed to regulate robot stability and gait robustness in the presence of matched parameter uncertainties and bounded external disturbances. Design, implementation and experimental evaluation of both roll gait control strategies for the spherical robot are done on smooth （indoor） and irregular （outdoor） ground surfaces, The performance of robot control is quantified by measuring the roll angle stability, phase plane convergence and wheel velocities. Experimental results show that proposed novel strategy is efficient in producing a stable rolling gait and robust control of a spherical robot on two different types of surfaces. It further shows that proposed high HOSMC strategy is more efficient in robust rolling gait control of a spherical robot compared to an integral first-order SMC on two different ground conditions.

关键词： bioinspired spherical robot rolling gait CPG rolling friction integral first-order SMC control HOSMC

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

China＇s Sponge City construction： A discussion on technical approaches

引用

Frontiers of Environmental Science & Engineering 2017年第4期11卷 39-49页

作者： Haifeng Jia Zheng Wang Xiaoyue Zhen Mike Clar Shaw l. Yu School of Environment Tsinghua University Beijing 100084 China Beijing Orient Tetra Tech Ecological Technology ltd. Beijing 100051 China Tetra Tech Fairfax VA 22030 USA Department of Civil & Environmental Engineering University of Virginia Charlottesville VA 22904 USA

Since 2014, China has been implementing the Sponge City Construction initiative, which represents an enormous and unprecedented effort by any government in the world for achieving urban sustainability. According to preliminary estimates, the total investment on the Sponge City Plan is roughly 100 to 150 million Yuan （RMB）（$15 to $22.5 million） average per square kilometer or 10 Trillion Yuan （RMB）（$1.5 Trillion） for the 657 cities nationwide. The Sponge City Plan （SCP） calls for the use of natural processes such as soil and vegetation as part of the urban runoff control strategy, which is similar to that of low impact development （lID） and green infrastructure （G1） practices being promoted in many parts of the world. The SCP includes as its goals not only effective urban flood control, but also rainwater harvest, water quality improvement and ecological restoration. So far, the SCP implementation has encountered-some barriers and challenges due to many factors. The present paper presents a review of those barriers and challenges, oftizrs discussions and recommendations on several technical aspects such as control goals and objectives; planning/design and construction of lID/GI practices; performance evaluation. Several key recommendations are proposed on Sponge City implementation strategy, Site-specific regulatory fi＇amework and technical gmdance, Product innovation and certification, lID/GI Project financing, lID/G1 profcssional training and certification, public outreach and education. It is expected that the successful implemen!atiun of the. SCP not only will bring about a sustainable, eco-friendly urbanization process in China, but also contribute enormously to the lID/Gl research and development with the vast amount of relevant data and experiences generated from the Sponge City construction projects.

关键词： low impact development Green infrastructure (GI) Sponge City Barriers Construction strategies

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

Effect of vacuum gas oil hydrotreating reactor on multiple reactors and hydrogen network

引用

Chinese Journal of Chemical Engineering 2019年第10期27卷 2498-2509页

作者： Donghui lü YingjiaWang lingjun Huang Di Zhang Guilian liu Wei li PengWang School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'an 710049China Hohhot Branch of PetroChina Pipeline Company PetroChinaHohhot 010000China

The inlet temperature of the Vacuum Gas Oil(VGO)hydrotreating reactor of a refinery is analyzed with the integration of multiple series reactors and hydrogen network *** effect of the inlet temperature(T1)on hydrogen sinks/sources and the product output is analyzed systematically based on the simulation of the series reactors,including VGO hydrotreating reactor,hydrocracking reactor,fluid catalytic cracking reactor and visbreaking *** general relation between the Hydrogen Utility Adjustment(HUA)and multiple pairs of varying sinks and sources is deduced,and correlations between varying streams and T1 are linearly *** on this,the quantitative equation between HUA and T1 is derived,and corresponding diagram is *** T1 corresponding the minimum hydrogen consumption is identified to be 345°C.

关键词： VGO hydrotreating Reactors Temperature Hydrogen consumption

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

Integrated waste and water management in mining and metallurgical industries

引用

中国有色金属学会会刊：英文版 2008年第6期18卷 1497-1505页

作者： B.K.C.CHAN S.BOUZAlAKOS A.W.l.DUDENEY Department of Earth Science and Engineering Imperial College Centre for Innovation in Carbon Capture and Storage(CICCS) University of Nottingham

引得出的操作通常共同生产不能出售的材料(矿物质浪费) 的大数量。增强的费用和世界范围的规定为如此的浪费的减小和复用加亮增加的需要。现在的纸为固体和水介绍一个新综合浪费管理计划。计划被连接到硫醚筹款集中的金属处理的 biohydr... 详细信息

引得出的操作通常共同生产不能出售的材料(矿物质浪费) 的大数量。增强的费用和世界范围的规定为如此的浪费的减小和复用加亮增加的需要。现在的纸为固体和水介绍一个新综合浪费管理计划。计划被连接到硫醚筹款集中的金属处理的 biohydrometallurgical 的合成废物和过程水的新奇处理例示。硫醚的 Bioleaching 专注导致稳固的废物的二种类型：ferrihydrite/gypsum 从 bioleach 白酒和未沥滤的脉石的中立状态猛抛。纸显示那，依赖部件包含了的未成年者，在混合的稳固的阶段可能有用地在产品的三种类型之中被散布：常规地下的装填， cemented 土木工程装填(特别地控制的低力量材料或 ClSM ) 和生产土壤。包含模仿的矿物质废物强调 ClSM，证明如此的材料能展出力量，孔和渗透的要求的特征。什么时候有毒的部件，例如，从倔强的金矿石的砷，是在场的，封装将被要求。过程水典型地被再循环远及可能，尽管任何过量以前应该被对待，再使用或排出。纸也由反向的渗透(能通常移开溶解部件的很少方法之一) 加亮处理，特别地在氧化状态 +6 显示出那砷能乐意地为分泌物被移开(<

关键词：置换沉淀废物处理生物浸取金矿

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

Exergy analysis of R1234ze（Z） as high temperature heat pump working fluid with multi-stage compression

引用

Frontiers in Energy 2017年第4期11卷 493-502页

作者： Bin HU Di WU l.W. WANG R.Z. WANG Institute of Refrigeration and Cryogenics Shanghai Jiao Tong University Shanghai 200240 China

In this paper, the simulation approach and exergy analysis of multi-stage compression high tempera- ture heat pump （HTHP） systems with R1234ze（Z） working fluid are conducted. Both the single-stage and multi-stage compression cycles are analyzed to compare the system performance with 120℃ pressurized hot water supply based upon waste heat recovery. The exergy destruction ratios of each component for different stage compression systems are compared. The results show that the exergy loss ratios of the compressor are bigger than that of the evaporator and the condenser for the single-stage compres- sion system. The multi-stage compression system has better energy and exergy etticiencies with the increase of compression stage number. Compared with the single- stage compression system, the coefficient of performance （COP） improvements of the two-stage and three-stage compression system are 9.1% and 14.6%, respectively. When the waste heat source temperature is 60℃, the exergy efficiencies increase about 6.9% and 11.8% for the two-stage and three-stage compression system respec- tively.

关键词： multi-stage compression high temperatureheat pump heat recovery exergy destruction,R1234ze(Z) working fluid

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

Difference in formation of plasma electrolytic oxidation coatings on Mgli alloy in comparison with pure Mg

引用

Journal of Magnesium and Alloys 2021年第5期9卷 1745-1760页

作者： Ting Wu Carsten Blawert Xiaopeng lu Maria Serdechnova Mikhail l.Zheludkevich Institute of Surface Science Helmholtz-Zentrum Hereon21502 GeesthachtGermany Shenyang National laboratory for Materials Science Northeastern University110819 ShenyangChina Institute for Materials Science Faculty of EngineeringKiel UniversityKaiserstrasse 224143 KielGermany

In order to study the substrate lattice structure(li addition)on the growth of plasma electrolytic oxidation(PEO)coatings,Mg li alloy(11.36 wt.%of li,cubic)and pure Mg(hexagonal)were treated under a pulsed direct PEO mode in a phosphate electrolyte for different periods of *** results revealed that the presence of li and li-rich phases in the cubic Mg alloy seems to be essential for the treatment result rather than the original lattice structure.A modified discharge behavior of Mg li alloy finally led to a different microstructure of the *** unstable coatings of Mg li alloy tended to dissolve rapidly though shared the similar composition to that of pure *** was incorporated only in the primary conversion products at the interface of coating/Mg *** spite of the advanced efficiency of energy input during processing,the more porous and thinner PEO coatings on the Mg li alloy were less resistant to abrasion and corrosion.

关键词： Plasma electrolytic oxidation Magnesium lithium alloy Pure magnesium Microstructure

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

Eddy Calculation and Vacuum Field Reconstruction on EAST

引用

Plasma Science and Technology 2011年第2期13卷 145-152页

作者：罗正平肖炳甲 J.A.lEUER M.l.WAlKER 袁旗平 Institute of Plasma Physics Chinese Academy of Sciences General Atomics DⅢ-D National Fusion Facility

A new method, by using eigenmodes to reduce the fitting parameters and precalculated eddy current based on a lump parameter circuit equation, is applied to reconstruct the vacuum field for EAST plasma startup.

关键词： EAST eddy calculation vacuum field reconstruction tokamak

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

A Comparison of Carlin-type Gold Deposits：Guizhou Province,Golden Triangle,Southwest China,and Northern Nevada,USA

引用

地学前缘 2013年第1期20卷 1-18页

作者： Jean S.CllNE John l.MUNTEAN Xuexiang GU Yong XIA University of Nevada las Vegas Nevada BareaH of Mines and Geology and University of Nevada Reno School of Earth Sciences and Resources China University of Geosiences(Beijing) State Key laboratory of Ore Deposit Geochemistry.Institute of Geochemistry.Chinese Academy of Sciemces

Several Au deposits in Guizhou Province,southwest China,described as being similar to the highly productive Carlin-type gold deposits in northern ***,were examined to identify similarities and differences between the two *** were collected along transects from lowto high-grade rock,where possible,and fram stockpiles at the Shuiyindong,Zimudang,Taipingdong,Yata and Jinfeng(formerly lannigou)*** used to examine ore and alteration minerals included hand-sample description:reflectance spectroscopy using an ASD Terraspec spectrometer;analyses of hand samples by carbonate staining with Alizaren red and potassium ferricyanide;transmitted and reflected light petrography;chemical analyses,mineral identification,and imaging using a ***-5610 scanning electron microscope:and quantitative chemical analyses using a JEOl JXA-8900 electron probe *** analyses of hand samples for 52 elements were done by AlS *** indicate both similarities and differences between the two *** districts have similar geologic *** deposits at both locations appear to have formed as a result of similar tectonic *** the district in southwest China lacks evidence of eoeval felsic igneous activity;however,the ore-stage minerals and the fluids that produced the minerals and deposits have some significant *** Nevada deposits were dominated by fluid-rock reaction in which host rock Fe was sulfidized to form Au-bearing *** ore fluids sulfidized host rock Fe in the Cuizhou *** timing of Fe metasomatism is unknown,so whether the deposits formed in response to sulfidation or pyritization is ***-rock reaction between an acidic,aqueous fluid and highly reactive calcareous rocks in Nevada caused extensive decarbonatization of host rocks,jasperoid replacemerit of carbonate minerals,and alteration of silty rock components to illite and *** Guizhou,CO2-bearing ore flu

关键词：地质地理学地质构造气藏

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：