检索结果-南通市图书馆

Applied Mathematics and Mechanics(English Edition) 2022年第12期43卷 1951-1964页

作者： B.j.GIREESHA l.ANITHA Department of Post Graduation Studies and Research in Mathematics Kuvempu UniversityShankaraghatta 577451India Department of Mathematics Adichunchanagiri Institute of TechnologyChikkamagaluru 577102India

The main aim of the present work is to investigate the flow and heat transport properties of non-Newtonian Casson-Williamson fluid through an upright microchannel along with entropy generation analysis,and explore the effects of convective boundary conditions,Couette-Poiseuille flow,and nonlinear *** movement of liquid is scrutinized with the Hall effect and exponential heat *** rheological characteristics of the Casson-Williamson fluid model are also *** considering the desirable similarity variables,the equations of motion are reduced to nonlinear ordinary differential *** Runge-Kutta-Fehlberg fourth-fifth order method along with the shooting method is adopted to solve these dimensionless *** detailed investigation is pictorially displayed to show the influence of effective parameters on the entropy generation and the Bejan *** of the major tasks of the exploration is to compare the Casson fluid and the Williamson *** results show that the rate of heat transfer in the Casson fluid is more remarkable than that in the Williamson fluid.

关键词： entropy generation Bejan number convective boundary condition Hall effect nonlinear radiation exponential heat source

Plasticity of Xyloglucan Composition in Bean （Phaseolus vulgaris）-Cultured Cells during Habituation and Dehabituation to lethal Concentrations of Dichlobenil

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2010年第3期3卷 603-609页

作者： A. Alonso-Simon l. Neumetzler R Garcia-Angulo A.E. Encina j.l. Acebes j.M. Alvarez T. Hayashi Area de Fisiologia Vegetal Universidad de Leon E-24071 Leon Spain Max Planck Institute of Molecular Plant Physiology 14476 Golm Germany Kyoto University RISH Gokasho Uji Kyoto 611-0011 Japan

Bean cells that have been habituated to grow in a lethal concentration （12 μM） of 2,6-dichlorobenzonitrile （dichlobenil or DCB, a cellulose biosynthesis inhibitor） are known to have decreased cellulose content in their cell walls. Xyloglucan, which is bound to cellulose and together with it forms the main loading network of plant cell walls, has also been described to decrease in habituated cells, but whether the change on cellulose affects the xyloglucan structure besides its abundance has not been analyzed. Fragmentation analysis with xyloglucan-specific endoglucanase （XEG） and endocellulase revealed that habituation to DCB caused a change in the fine structure of xyloglucan, namely a decrease in fucosyl residues attached to the galactosyl-xylosyl residues along the glucan backbone. After the removal of herbicide from the medium （dehabituated cells）, xyloglucan recovered its fucosyl residues. In addition, some cello-oligosaccharides could be detected only in habituated cells＇ xyloglucan digested by XEG and endocellulase, corresponding to a glucan co- valently bound or co-precipitated with the hemicelluloses. These results show that structural flexibility of cell walls relies in part on the plasticity of xyloglucan composition and opens up new perspectives to further research in this field.

关键词： Bean 2,6-dichlorobenzonitrile habituation and dehabituation OlIMP (Oligosaccharides Mass Profiling) xyloglucan.

Description of two new species of Hemiphyllodactylus(Reptilia: Gekkonidae) from karst landscapes in Yunnan, China, highlights complex conservation needs

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

Zoological Research 2022年第5期43卷 767-786页

作者： Ade Prasetyo Agung Ada Chornelia l.lee Grismer jesse l.Grismer Evan S.H.Quah jian-Mei lu Kyle W.Tomlinson Alice C.hughes landscape Ecology Group Center for Integrative ConservationXishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglunMenglaYunnan 666303China University of Chinese Academy of Sciences Beijing 101408China Herpetology laboratory Department of BiologyLa Sierra UniversityRiversideCalifornia 92515USA Institute for Tropical Biology and Conservation Universiti Malaysia SabahJalan UMSKota KinabaluSabah 88400Malaysia lee Kong Chian Natural History Museum National University of SingaporeSingapore 117377Singapore Community Ecology and Conservation Group Center for Integrative ConservationXishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglunMenglaYunnan 666303China School of Biological Sciences University of Hong KongPokfulamHong Kong SARChina

Karst habitats are hotspots of diversity and endemism. Their naturally fragmented distributions across broad geographic landscapes have led to the complex array of smaller evolutionary ecosystems that present unique challenges from a conservation *** assessments of karst habitats have revealed that these ecosystems contain an almost unparalleled level of endemism, and many site-restricted species remain undescribed, thus posing considerable challenges for effective conservation *** rock-dwelling species, such as geckos, may be particularly prone to such isolation. In this paper, we discuss one such genus, i.e.,Hemiphyllodactylus, and explore its diversity across karst landforms in Yunnan Province, southwestern China. Based on morphological and genetic data, we describe two new species of Hemiphyllodactylus from karst habitats in Simao District and Yanshan County. A phylogenetic tree for Hemiphyllodactylus was constructed using 1?039 base pairs(bp) of the mitochondrial NADH dehydrogenase subunit 2 gene(ND2). The Simao and Yanshan specimens can be distinguished from all other congeners within their respective subclades based on uncorrected genetic pairwise distances greater than 6.3% and 4.3%respectively, as well as significant morphological differences. The discovery and description of these two new species brings the total number of described Hemiphyllodactylus species in China to 14and indicates many more undescribed species from unsurveyed karst regions await *** findings suggest that karst ecosystems in Yunnan support a higher diversity of Hemiphyllodactylus than previously *** study also highlights the importance of karst ecosystems as refugia for sitespecific endemic species and the need for heightened conservation efforts.

关键词： Discovery Endemism Geckos Reptiles South China

在线全文

学校读者我要写书评

暂无评论

用截面变形耦合有限元法分析复合材料梁

应用数学和力学 2006年第12期27卷 1497-1505页

作者：姜文光 j.l.亨帅扶名福（推荐）燕山大学机械工程学院秦皇岛066004 布里斯托尔大学航天工程系 BS81TR英国；诺丁汉特伦特大学机械和制造工程系诺丁汉NG14BU英国不详

复合材料板和梁具有优良的特性,从而获得了广泛的应用·然而由于材料的各向异性,使得对这类材料构件作变形和应力分析时,即使应用如有限元法的数值分析手段仍是非常复杂费时的·为此提出了一个可应用常规有限单元法,分析等截面复合材料... 详细信息

复合材料板和梁具有优良的特性,从而获得了广泛的应用·然而由于材料的各向异性,使得对这类材料构件作变形和应力分析时,即使应用如有限元法的数值分析手段仍是非常复杂费时的·为此提出了一个可应用常规有限单元法,分析等截面复合材料梁承受均匀拉弯扭载荷的一个简单精确分析的实施方法·由于巧妙地利用了变形的对称特性,使得分析只需建立在梁的一个切片构造的几何模型上,用常规三维实体有限单元进行结构离散·推导了精确的变形场模式,并借助结构平移自由度的耦合关系使得数值分析易于实施·并通过数值算例来阐明方法的实施过程·

关键词：复合材料等截面梁耦合方程有限单元法拉伸弯曲扭转

在线全文

学校读者我要写书评

暂无评论

How to Hyperion

宝石和宝石学杂志（中英文） 2023年第6期25卷 149-152页

作者： E.Billie hughes lotus Gemology Co.ltd. Bangkok 10500Thailand

*** is said that necessity is the mother of *** this author was contacted about sharing an article that could help gemologists learn more about origin determination,it seemed like a perfect opportunity to provide information about our own laboratory’s invention,*** is a tool we crafted to meet our own necessity,particularly as we faced the challenge of origin determination.

关键词： determination origin own

Three-dimensional perfused human in vitro model of nonalcoholic fatty liver disease

在线全文

学校读者我要写书评

暂无评论

World journal of Gastroenterology 2017年第2期23卷 204-215页

作者： Tomasz Kostrzewski Terri Cornforth Sophie A Snow larissa Ouro-Gnao Cliff Rowe Emma M large David j hughes CN Bio Innovations limited Welwyn Garden City AL7 3AXUnited Kingdom

AIM To develop a human in vitro model of non-alcoholic fatty liver disease(NAFlD), utilising primary hepatocytes cultured in a three-dimensional(3D) perfused platform. METHODS Fat and lean culture media were developed to directly investigate the effects of fat loading on primary hepatocytes cultured in a 3D perfused culture system. Oil Red O staining was used to measure fat loading in the hepatocytes and the consumption of free fatty acids(FFA) from culture medium was monitored. Hepatic functions, gene expression profiles and adipokine release were compared for cells cultured in fat and lean conditions. To determine if fat loading in the system could be modulated hepatocytes were treated with known anti-steatotic compounds. RESUlTS Hepatocytes cultured in fat medium were found to accumulate three times more fat than lean cells and fat uptake was continuous over a 14-d culture. Fat loading of hepatocytes did not cause any hepatotoxicity and significantly increased albumin production. Numerous adipokines were expressed by fatty cells and genes associated with NAFlD and liver disease were upregulated including: Insulin-like growth factorbinding protein 1, fatty acid-binding protein 3 and CYP7A1. The metabolic activity of hepatocytes cultured in fatty conditions was found to be impaired and the activities of CYP3A4 and CYP2C9 were significantlyreduced, similar to observations made in NAFlD patients. The utility of the model for drug screening was demonstrated by measuring the effects of known antisteatotic compounds. Hepatocytes, cultured under fatty conditions and treated with metformin, had a reduced cellular fat content compared to untreated controls and consumed less FFA from cell culture *** The 3D in vitro NAFlD model recapitulates many features of clinical NAFlD and is an ideal tool for analysing the efficacy of anti-steatotic compounds.

关键词： Non-alcoholic fatty liver disease liver disease Three-dimensional cell culture Organ-on-chip Primary cell culture Fatty liver Hepatocytes

The presenting and prescribing patterns of migraine in an Australian emergency department: A descriptive exploratory study

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

World journal of Emergency Medicine 2017年第3期8卷 170-176页

作者： Emily Shao james hughes Rob Eley Royal Brisbane and Women's Hospital Emergency Department Princess Alexandra Hospital Emergency Medicine Research Program The University of Queensland Faculty of Medicine

BACKGROUND: Migraine is a common neurological condition that frequently presents to the emergency department(ED). Many medications are available to treat migraine. This study aims to characterize the demographics of patients who present to a large metropolitan ED with migraine, and to identify the medications used in treating this ***: This study is a retrospective database interrogation of clinical records, used to collect quantitative data on patient demographics and medication prescriptions in the ***: A total of 2 228 patients were identified as being treated for migraine over a 10-year period. The proportion of the ED population presenting with migraine steadily increased in this time. Females(71%) more commonly presented to the ED with migraine than males. The migraine population was signifi cantly younger(M=37.05, SD=13.23) than the whole ED population(M=46.17 SD=20.50)(Ple analgesics such as paracetamol and ibuprofen, anti-emetics and intravenous(IV) fluids with phenothiazine additives were commonly used. Over 20% of patients were prescribed oral or parenteral opiates(42 of 194 initial medication prescriptions, and 64 of 292 as required medication prescriptions). Triptans were very rarely ***: Migraine is an increasingly common presentation to the ED. People presenting to the ED with migraine are more likely to be younger and female than the general ED population. Peak presentations for migraines occurred in january and February. The medications that are prescribed in the ED for migraine is varied and are not always in line with current evidence for the treatment of migraine. The excessive reliance on opiates and lack of the use of triptans denotes a signifi cant variation from published guidelines.

关键词： Migraine Headache Pain Emergency department Analgesia

A novel approach to enhance decrepitation temperature and reducibility of ultrafine iron ore concentrate pellets

在线全文

学校读者我要写书评

暂无评论

journal of Iron and Steel Research International 2024年第11期31卷 2622-2632页

作者： B.l.Wen Z.H.Fan j.X.li D.l.liu j.l.Yang School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243032AnhuiChina jianlong(liaoning)Energy Saving and Environmental Protection

Utilizing ultrafine iron ore concentrate for pellet production can expand domestic iron ore resources in China and promote the utilization of low-grade ***,a challenge arises with the low decrepitation temperature and reducibility in the preparation process of ultrafine iron ore concentrate *** address the challenge,a novel approach was proposed,which incorporated straw powder as an additive to enhance pellet porosity,thereby improving the decrepitation temper-ature and reducibility of ultrafine iron ore concentrate *** effect of varying proportions of straw powder(0.0-2.0%)on the characteristics of ultrafine iron ore concentrate pellets was *** indicate that at a 2.0%straw powder ratio,pellet decrepitation temperature notably rises from 380 to 540℃,while the reducibility index escalates from 25.7%to 48.1%.Nevertheless,the addition of straw powder results in diminished drop strength,compressive strength of green pellets,and cold crushing strength of fired *** addition,enhanced pellet reducibility leads to exacerbated reduction swelling index and reduction degradation *** these effects,all parameters remain within an acceptable range.

关键词： Ultrafine iron ore concentrate:Straw powder Green pellet quality Decrepitation temperature:Metallurgical property

Ultrastructure of the gastro intestinal tract of healthy japanese quail(Coturnix japonica) using light and scanning electron microscopy

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

Animal Nutrition 2018年第4期4卷 378-387页

作者： Ngare Wilkinson Ivan Dinev William j.Aspden Robert j.hughes Ingrid Christiansen james Chapman Sheeana Gangadoo Robert j.Moore Dragana Stanley Central Queensland University Institute for Future Farming Systems Poultry Cooperative Research Centre University of New England Armidale Faculty of Veterinary Medicine Trakia University South Australian Research and Development Institute Pig and Poultry Production Institute School of Animal and Veterinary Sciences University of Adelaide School of Science RMIT University Department of Microbiology Monash University

The japanese quail(Coturnix japonica) are popular both as an alternative protein source and as a model of choice for scientific research in several disciplines. There is limited published information on the histological features of the intestinal tract of japanese quail. The only comprehensive reference is a book published in 1969. This study aims to fill that niche by providing a reference of general histological features of the japanese quail, covering all the main sections of the intestinal tract. Both light and scanning electron microscope(SEM) images are presented. Results showed that the japanese quail intestinal tract is very similar to that of the chicken with the exception of the luminal koilin membrane of the gizzard. Scanning electron microscopic photomicrographs show that in the japanese quail koilin vertical rods are tightly packed together in a uniform manner making a carpet-like appearance. This differs in chicken where the conformations of vertical rods are arranged in clusters.

关键词： japanese quail Coturnix japonica Histology Microscopy Scanning electron microscopy Gastrointestinal tract

Organic light Emitting Diodes with lithium Contained Alq3 as Electron Injection layer

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2002年第2期18卷 121-123页

作者： Zugang liu j.l.Pinto Department of Materials University of OxfordParks RoadOxford OX13PFUK Departamento de Física Universidade de Aveiro3810194 AveiroPortuga

lNovel lithium doped tris 8 hydroxylquinoline aluminium(Alq3:li) layer is deposited between emission layer and electron injection aluminium electrode as an electron injection assistant layer in different organic light emitting diodes(OlED) to lower the electron injection barrier. In these devices, Alq3 is used as emission layer, and a bilayer film of N,N bis (1 naphhyl) N,N diphenyl 1,1 biphenyle 4,4' diamine(NPB) and 4,4,4' tris(3 methyl phenylphenylamino) triphenylamine( m MTDATA) used as hole transport layer(HTl). The electroluminescent performance of devices with different thicknesses of Alq3∶li shows that the insertion of the lithium doped Alq3 layer can reduce the turn on voltage by at least 2 volts, and the stability of devices with this lithium doped Alq3 layer is improved too. It can also change the efficiency of devices. Compared with an ultra thin lithium fluoride(liF) layer, Alq3∶li sheet gives similar effects but higher efficiency and can be much thicker and hence it is easier to control the deposition.

关键词： Organic light emitting diodes lithium layer Alq3 EI