检索结果-南通市图书馆

Assessing habitat quality of the mountain nyala Tragelaphus buxtoni in the Bale Mountains, Ethiopia

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2012年第4期58卷 525-535页

作者： paul H. EVANGELISTA John NORMAN III paul SWARTZINKI3,paul SWARTZINKI3,paul SWARTZINKI Nicholas E. YOUNG Natural Resource Ecology Laboratory Colorado State University Fort Collins CO 80524-1499 USA Natural Resource Conservation Service Shepardson Bldg. Colorado State University Fort Collins CO 80524 USA AECOM 1601 Prospect Pkwy Fort Collins CO 80303 USA

Populations of the endangered mountain nyala Tragelaphus buxtoni are significantly threatened by the loss of critical habitat. Population estimates are tentative, and information on the species＇ distribution and available habitat is required for for-mulating immediate management and conservation strategies. To support management decisions and conservation priorities, we integrated information from a number of small-scale observational studies, interviews and reports from multiple sources to define habitat parameters and create a habitat quality model for mountain nyala in the Bale Mountains. For our analysis, we used the FunConn model, an expertise-based model that considers spatial relationships （i.e., patch size, distance） between the species and vegetation type, topography and disturbance to create a habitat quality surface. The habitat quality model showed that approxi- mately 18,610 km^2 （82.7% of our study area） is unsuitable or poor habitat for the mountain nyala, while 2,857 km^2 （12.7%） and 1,026 km^2 （4.6%） was ranked as good or optimal habitat, respectively. Our results not only reflected human induced habitat deg-radation, but also revealed an extensive area of intact habitat on the remote slopes of the Bale Mountain＇s southern and southeast- ern escarpments. This study provides an example of the roles that expert knowledge can still play in modem geospatial modeling of wildlife habitat. New geospatial tools, such as the FunConn model, are readily available to wildlife managers and allow them to perform spatial analyses with minimal software, data and training requirements. This approach may be especially useful for species that are obscure to science or when field surveys are not practical .

关键词： Expert knowledge FunConn model Habitat mapping Land cover Mountain nyala Wildlife conservation

Mediated electrochemistry of dimethyl sulfoxide reductase promoted by carbon nanotubes

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

Science China Chemistry 2010年第12期53卷 2560-2563页

作者： BERNHARDT paul V University of Queensland

Mediated electrochemistry of dimethyl sulfoxide reductase from Rhodobacter capsulatus (DMSOR) which is immobilized on a bare glassy carbon (GC) electrode and a carbon nanotube (CNT)-modified GC electrode was studied using the Co complex (trans-6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane-6,13-diamine)cobalt(III) ([Co(trans-diammac)] +) as a *** cyclic voltammograms of different electrodes were carried out at different substrate (DMSO) *** results demonstrated that the catalytic current was increased by employing CNT as a promoter.

关键词： DMSO reductase carbon nanotubes electrochemistry mediator

Electrochemical characterization of Ni-Co and Ni-Co-Fe for oxidation of methyl alcohol fuel with high energetic catalytic surface

在线全文

学校读者我要写书评

暂无评论

燃料化学学报 2014年第1期42卷 87-95页

作者： Subir paul Sk Naimuddin Asmita Ghosh Department of Metallurgical and Material Engineering Jadavpur University

Non Pt based metals and alloys as electrode materials for methyl alcohol fuel cells have been investigated w ith an aim of finding high electrocatalytic surface property for the faster electrode *** w ere fabricated by electrodeposition on pure Al foil,from an electrolyte of Ni,Co,Fe *** optimum condition of electrodeposition w ere found out by a series of experiments,varying the chemistry of the electrolyte,pH valve,temperature,current and cell *** study of the coated Ni-Co or Ni-CoFe alloy on pure Al w as found to exhibit high exchange current density,indicating an improved electro catalytic surface w ith faster charge-discharge reactions at anode and cathode and low *** impedance studies on coated and uncoated surface clearly show ed that the polarization resistance and impedance w ere decreased by Ni-Co or Ni-Co-Fe coating.X-ray diffraction(XRD),energy dispersive X-ray spectroscopy(EDX)and atomic absorption spectroscopy(AAS)studies confirmed the presence of alloying elements and constituents of the *** morphology of the deposits from scanning electron microscope(SEM)images indicated that the electrode surface w as a three dimensional space w hich increased the effective surface area for the electrode reactions to take place.

关键词： electrodeposition Ni-Co alloy electrocatalytic exchange current density impedance X-ray diffraction(XRD) scanning electron microscope(SEM)

Evolution of Nanocrystalline TiBCN Structure with Temperature and Mechanism

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2012年第S1期41卷 341-343页

作者： paul K Chu Department of Physics and Materials Science City University of HongkongKowloon HongkongChina

Evolution of the TiB0.71C3.32N0.79 quaternary nanocomposite structure at 600,700,800,900,and 1000℃ is investigated by high-resolution transmission electron microscopy,X-ray diffraction,X-ray photoelectron spectrometry,and micro-hardness *** nc-Ti(C,N)nanocrystallites exhibit the(200)preferential orientation and the amorphous carbon(a-C)phase gradually transforms into the crystallite graphite phase as the temperature is *** 1000℃,the nc-Ti(C,N)nanocrystallites increase to a size of 13 nm but the microhardness diminishes to 18-19 *** corresponding mechanism is discussed.

关键词： nanocomposites structure TiBCN

Why China is important in advancing the field of primatology

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2018年第4期39卷 241-243页

作者： paul A.Garber Department of Anthropology Program in Ecology Evolution and Conservation Biology University of Illinois

Over the past few decades, field studies conducted by Chinese primatologists have contributed significant new theoretical and empirical insights into the behavior, ecology, biology, genetics, and conservation of Iorises, macaques, langurs, snubnosed monkeys, and gibbons. With the recent establishment and inaugural meeting of the China Primatological Society in 2017, China has emerged as a leading nation in primate research. Several research teams have conducted long-term studies despite the difficult challenges of habituating and observing wild primates Inhabiting mountainous temperate forests, and the fact that some 80% of China＇s 25-27 primate species are considered vulnerable, endangered, or critically endangered and are distributed in small isolated subpopulations. In going forward, it is recommended that primatologists in China increase their focus on seasonal differences in the social, ecological, physiological, and nutritional challenges primates face in exploiting high altitude and cold temperate forests. In addition, provisioning as a habitation tool should be minimized or eliminated, as it is difficult to control for its effects on group dynamics, patterns of habitat utilization, and feeding ecology. Finally in the next decade, Chinese primatologists should consider expanding the taxonomic diversity of species studied by conducting research in other parts of Asia, Africa, and the Neotropics.

关键词： China Conservation Primate research Ecology

Nanoscience in the era of global science and global change--Cooperative, quantitative, and focused on benefit to humanity

在线全文

学校读者我要写书评

暂无评论

Nano Research 2016年第1期9卷 1-2页

作者： A. paul Alivisatos Department of Chemistry University of California Berkeley California 94720 USA

Nanoscience has emerged as a powerful new discipline that unites and empowers conventionally disparate scientific and engineering disciplines with a common perspective. Our foundation is centered around the twin goals of discovering and understanding the fundamental scaling laws for the behavior and pro- perties of matter as it is controlled on the nanoscale, and on developing the ability to synthesize artificial nanoscale building blocks in a controlled manner. The early successes of this approach were rapidly followed by the development of a wide range of new applications of these materials.

关键词： benefits personally sustainable

A fast and accurate model for the creation of explosion fragments with improved fragment shape and dimensions

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

Defence Technology（防务技术） 2022年第2期18卷 159-169页

作者： David Felix Ian Colwill paul Harris School of Computing Engineering&MathematicsUniversity of BrightonBrightonUK Engineering and Design(Alumni) University of SussexBrightonUK

Explosion models based on Finite Element Analysis(FEA)can be used to simulate how a warhead *** their execution times are *** protection systems need to make very fast predictions,before a fast attacking weapon hits the *** execution times are also needed in real time simulations where the impact of many different computer models is being ***,FEA explosion models are not appropriate for these real-time *** research presented in this paper delivers a fast simulation model based on Mott’s equation that calculates the number and weight of fragments created by an *** addition,the size and shape of fragments,unavailable in Mott’s equation,are calculated using photographic evidence and a distribution of a fragment’s length to its *** model also identifies the origin of fragments on the warhead’s *** results are verified against experimental data and a fast execution time is achieved using uncomplicated simulation *** developed model then can be made available for real-time simulation and fast computation.

关键词： Distribution of fragments Fragment shape Real-time simulation Cylindrical explosion

Long‑term outcomes of two first‑generation trabecular micro‑bypass stents(iStent)with phacoemulsification in primary open‑angle glaucoma:eight‑year results

在线全文

学校读者我要写书评

暂无评论

Eye and Vision 2021年第4期8卷 431-442页

作者： Ali Salimi Harrison Watt paul Harasymowycz Department of Ophthalmology Faculty of MedicineMcGill UniversityMontrealQCCanada Montreal Glaucoma Institute MontrealQCCanada Faculty of Medicine McGill UniversityMontrealQCCanada Department of Ophthalmology University of Montreal4135 de RouenMontrealQC H1V1G5Canada

Background:The short-and medium-term outcomes of iStent have been extensively studied;however,only few studies have investigated its long-term ***,we assessed the long-term efficacy and safety of two iStents with concomitant cataract surgery in glaucomatous eyes while also evaluating measures of disease stability using visual field and optical coherence tomography(OCT)of the optic nerve and the macula throughout 8 years of ***:This longitudinal,single-center consecutive case series included glaucomatous eyes that underwent implantation of two first-generation trabecular micro-bypass stents(iStent)with concomitant cataract ***-year efficacy outcomes included mean intraocular pressure(IOP)and medications,as well as surgical ***-year safety outcomes included best-corrected visual acuity(BCVA),visual field mean deviation(VF-MD),cup-todisc ratio(CDR),retinal nerve fiber layer(RNFL)thickness,ganglion cell-inner plexiform layer(GC-IPL)thickness,and adverse ***:A total of 62 eyes with primary open-angle glaucoma(POAG)were *** 8 years postoperative,IOP reduced by 26%from 19.2±3.9 mmHg preoperatively to 14.2±2.4 mmHg(P<0.001),91.1%of eyes achieved IOP≤18 mmHg(vs.51.6%preoperatively),69.6%of eyes achieved IOP≤15 mmHg(vs.14.5%preoperatively),and 25%of eyes achieved IOP≤12 mmHg(vs.1.6%preoperatively).Medication use decreased by 17.9%from 2.8±1.1 preoperatively to 2.3±1.2(P=0.018).Surgical success was 90%,as six eyes underwent subsequent glaucoma *** measures of BCVA,CDR,RNFL thickness and GC-IPL thickness remained stable through 8 years ***-MD remained stable until postoperative year 5 and subsequently progressed according to the natural history of glaucomatous ***:Implantation of two iStents with concomitant cataract surgery is an effective and safe treatment option for surgery-naïve POAG eyes,evidenced by significant IOP and medication reductions,reasonable surgical success

关键词： Minimally invasive glaucoma surgery MIGS Trabecular micro-bypass stent iStent Glaucoma Cataract surgery Long-term outcomes

State of the Art in Alcohol Sensing with 2D Materials

维普期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2020年第3期12卷 22-54页

作者： Ramin Boroujerdi Amr Abdelkader Richard paul Faculty of Science and Technology Bournemouth UniversityTalbot CampusFern BarrowPoole BH125BBUK Department of Engineering University of CambridgeCambridge CB30FSUK

Since the discovery of graphene,the star among new materials,there has been a surge of attention focused on the monatomic and monomolecular sheets which can be obtained by exfoliation of layered *** materials are known as two-dimensional(2D)materials and offer enormous versatility and *** ultimate single atom,or molecule,thickness of the 2D materials sheets provides the highest surface to weight ratio of all the nanomaterials,which opens the door to the design of more sensitive and reliable chemical *** variety of properties and the possibility of tuning the chemical and surface properties of the 2D materials increase their potential as selective sensors,targeting chemical species that were previously difficult to *** planar structure and the mechanical flexibility of the sheets allow new sensor designs and put 2D materials at the forefront of all the candidates for wearable *** developing sensors for alcohol,the response time is an essential factor for many industrial and forensic applications,particularly when it comes to hand-held ***,we review recent developments in the applications of 2D materials in sensing alcohols along with a study on parameters that affect the sensing *** review also discusses the strategies used to develop the sensor along with their mechanisms of sensing and provides a critique of the current limitations of 2D materials-based alcohol sensors and an outlook for the future research required to overcome the challenges.

关键词： Sensors and biosensors Alcohol probes Electrochemical detectors Ethanol metabolites 2D materials