检索结果-南通市图书馆

Rheological study of nanoparticle-based cationic surfactant solutions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum 2022年第4期8卷 522-528页

作者： Ayomikun Bello joy Ozoani Adewale Adebayo Dmitriy Kuriashov Skolkovo Institute of Science and Technology MoscowRussia Moscow Engineering Physics Institute MoscowRussia Higher School of Economics MoscowRussia Kazan National Research Technological University KazanRussia

Worm-like micelles are of special interest among the many forms of surfactant aggregates because of their usefulness in research and *** are elongated,flexible aggregates formed by amphiphilic molecules spontaneously self-organizing in *** nature of the surfactant determines its unique shape,which may be altered by mixing it with other substances or changing physicochemical variables like as temperature,pH,or *** rheology of viscoelastic fluid systems is currently being modified using *** method,which was just introduced about 10 years ago,has shown to be highly promising,producing significant improvements in rheological properties,particularly at reservoir *** goal of this research is to investigate and assess the rheology of an aqueous cationic surfactant solution based on graphene oxide *** thermodynamics,structure and rheology of nanoparticle-based cationic surfactant solutions were investigated *** to structural and thermodynamic investigations in surfactant-nanoparticle mixtures,micellenanoparticle interactions arise as physical crosslinks between *** existence of these interactions is shown to generate considerable viscosity and viscoelasticity in wormlike micelles,even when the fluid is Newtonian in the absence of *** viscosity,shear modulus and relaxation time all increase as particle concentration *** nanoparticles generates a network of micellar entanglements as a result of *** results demonstrate that adding nanoparticles to surfactant solutions provides for a one-of-a-kind method of altering fluid rheology under a range of circumstances.

关键词： Surfactant Wormlike micelles Nanoparticles Viscosity Modulus Rheology

Biology and control of the fruit borer, Conopomorpha sinensis Bradley on litchi （Litchi chinensis Sonn.） in northern Thailand

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

Insect Science 2007年第6期14卷 525-529页

作者： MARIE joy SCHULTE KONRAD MARTIN JOACHIM SAUERBORN Institute of Plant Production and Agroecology in the Tropics and Subtropics University of Hohenheim Stuttgart Germany

Fruit and leaf shoot of litchi （Litchi chinensis） infestation by naturally occurring populations of the fruit bprer, Conopomorpha sinensis larvae and C. sinensis parasitization rates were determined in litchi orchards in northern Thailand at high （ca. 1 400 m ASL） and low （ca. 800 m ASL） elevations with different, non-overlapping fruiting seasons. In addition, spray applications of Bacillus thuringiensis var. aizawai, the natural compound spinosad and the chemical pesticide imidacloprid were conducted in the field to test the effects of these agents on C. sinensis fruit infestation rate. Fruit infestation rate and fruit growth, studied in a low elevation orchard, were sigmoidal and showed a highly significant positive correlation （P ≤ 0.01）. Leaf shoot infestation rate in the low elevation orchard decreased in the course of the fruiting season （March until May）, but increased in the high elevation orchard, where no fruits were present within the same period of time. Together, these results indicate that females of C. sinensis clearly prefer fruits over shoots for oviposition. If no fruits are available, which was the case in the high elevation orchard during that time, they are constrained to lay their eggs on shoots. The parasitization rate of C. sinensis larvae in untreated fruits was 54.3%. The parasitoid species were Chelonus chailini （90.8%） and Phanerotoma sp. （9.2%）. In the leaf shoots, C. sinensis was found to be parasitized by Phanerotoma sp. and Apanteles briareus. The applications of the different active agents had no significant effect on C. sinensis fruit infestation compared to the untreated control. Besides the cryptic life of the larvae, this is most probably explained by the fact that C. sinensis has several generations during the fruiting season. Because of the high parasitization rates recorded, an alternative and more effective control measure than the application of pesticides might be the augmentative release of parasitoids.

关键词： Conopomorpha sinensis fruit infestation Litchi chinensis northern Thailand,parasitoids pest control

The Era of Cross-Disciplinary Research for Medical Advances Is Coming--Briskly A Conversation with JOACHIM FRANK

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国生物化学与分子生物学报 2018年第1期34卷 13-15页

作者： joy JIAYI CHEng Columbia University Medical Center Dental and Craniofacial Regeneration Foundation New York NY 10032

我们高兴地看到,科学前沿与工程学技巧的结合将加强人类生物学知识的创造和积累.2017年度诺贝尔化学奖授予了三位生物物理学家:Jacques Dubochet,Joachim Frank和Richard Henderson,以表彰他们的突破性贡献——发展冷冻电子显微镜技术(c... 详细信息

我们高兴地看到,科学前沿与工程学技巧的结合将加强人类生物学知识的创造和积累.2017年度诺贝尔化学奖授予了三位生物物理学家:Jacques Dubochet,Joachim Frank和Richard Henderson,以表彰他们的突破性贡献——发展冷冻电子显微镜技术(cryo-EM)用于测定溶液中生物分子的高分辨率结构.这项技术使得人们能够领略蛋白质的结构,并有望最终揭开生命活动机制的奥秘.

关键词：生物学生物大分子物理学家科学研究工作

Layered double hydroxide using hydrothermal treatment： morphology evolution, intercalation and release kinetics of diclofenac sodium

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

Frontiers of Materials Science 2017年第4期11卷 395-409页

作者： Mathew joy SrividhyaJ. IYEngAR Jui CHAKRABORTY Swapankumar GHOSH Project Management Division CSIR-Central Glass & Ceramic Research Institute Kolkata-700032 India Bioceramics & Coating Division CSIR-Central Glass & Ceramic Research Institute Kolkata-700032 India

The present work demonstrates the possibilities of hydrothermal trans- formation of Zn-AI layered double hydroxide （LDH） nanostructure by varying the synthetic conditions. The manipulation in washing step before hydrothermal treatment allows control over crystal morphologies, size and stability of their aqueous solutions. We examined the crystal growth process in the presence and the absence of extra ions during hydrothermal treatment and its dependence on the drug （diclofenac sodium （Dic- Na）） loading and release processes. Hexagonal plate-like crystals show sustained release with -90% of the drug from the matrix in a week, suggesting the applicability of LDH nanohybrids in sustained drug delivery systems. The fits to the release kinetics data indicated the drug release as a diffusion-controlled release process. LDH with rod-like morphology shows excellent colloidal stability in aqueous suspension, as studied by photon correlation spectroscopy.

关键词： layered double hydroxide crystal morphology hydrothermal treatment drug loading

Development and applications of functional gene microarrays in the analysis of the functional diversity,composition,and structure of microbial communities

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2011年第1期5卷 1-20页

作者： Zhili HE joy DVAN NOSTRAND Ye DEng Jizhong ZHOU Institute for Environmental Genomics Department of Botany and MicrobiologyUniversity of OklahomaNormanOK 73019USA Earth Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Department of Environmental Science and Engineering Tsinghua UniversityBeijing 100084China

Functional gene arrays(FGAs)are a special type of microarrays containing probes for key genes involved in microbial functional processes,such as biogeochemical cycling of carbon,nitrogen,sulfur,phosphorus,and metals,biodegradation of environmental contaminants,energy processing,and stress *** are considered as the most comprehensive *** established probe design criteria and a computational pipeline integrating sequence retrieval,probe design and verification,array construction,data analysis,and automatic update are used to develop the GeoChip *** has been systematically evaluated and demonstrated to be a powerful tool for rapid,specific,sensitive,and quantitative analysis of microbial communities in a high-throughput *** generations of GeoChip have been developed and applied to investigate the functional diversity,composition,structure,function,and dynamics of a variety of microbial communities from different habitats,such as water,soil,marine,bioreactor,human microbiome,and extreme *** is able to address fundamental questions related to global change,bioenergy,bioremediation,agricultural operation,land use,human health,environmental restoration,and ecological theories and to link the microbial community structure to environmental factors and ecosystem functioning.

关键词： functional gene arrays(FGAs) GeoChip microbial communities functional diversity/composition/structure environmental factor ecosystem functioning

Transmission in mobile cloudlet systems with intermittent connectivity in emergency areas

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Digital Communications and Networks 2018年第1期4卷 69-75页

作者： Chhabi Rani Panigrahi joy Lal Sarkar Bibudhendu Pati Department of Computer Science Central University of Rajasthan Rajasthan India Department of Computer Science and Engineering C.V. Raman College of Engineering Bhubaneswar India

The recent development of Mobile Cloud Computing has helped in solving numerous real-life problems. The rate of growth of mobile devices has been increasing at a very high pace. Mobile devices have made substantial contributions in managing emergency situations. Owing to the mobility of mobile devices, cloudlets, and their intermittent connectivity, it may become very difficult to handle emergency situations. To address this problem, a transmission model is proposed for mobile cloudlet systems, where a mobile device is used to designate a cloudlet by using the Borda scores Method and the mobile device can offload a part of its application to this cloudlet. The simulation results demonstrated that the proposed work makes a significant comtribution toward alleviating the problems associated with emergency situations.

关键词： Mobile cloudlet systems Emergency areas BSM RINIL

Design and Analysis of Power and Transmission System of Downhole Pure Electric Command Vehicle

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Epidemiology of Mpox Outbreaks and Implications for Surveillance in Imo State, Nigeria

Journal of Transportation Technologies（交通科技期刊） 2024年第1期

作者： Md Jahangir Alam Md Shahriar Sujan Md.Al Imran Tapu joy Howlader

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

Advances in Infectious Diseases 2024年第1期14卷 206-212页

作者： Adeniyi A. Adeniran Ebubechi C. Eronini Olugbenga Asaolu Simisola Adedeji Adaeze joy Ugwu Marcus Oludare Faith Ehiaghe Ugba Aibinuomo Ayomide Oluwaseyi Tella Adedamola Dania Oluyinka Olayiwola Olanike Suliat Oladele Tinuola Daniel Musa Haruna Adebayo O. Amao John O. Ibitoye Oluwagbemiga Obembe Christopher Obanubi Abdulmalik Abubakar Department of Public and Allied Health Babcock University Ilishan-Remo Nigeria Department of Public Health University of Suffolk Waterfront Building UK Department of Public Health EUCLID University Greater Bajul The Gambia Department of Public Health Liverpool John Moores University Liverpool UK College of Medicine Obafemi Awolowo University Ile-Ife Nigeria Department of Environmental Health Sciences University of Ibadan Ibadan Nigeria Department of Public Health Texila American University Georgetown Guyana School of Public Health University of Port Harcourt Port Harcourt Nigeria Department of Community Medicine University College Hospital Ibadan Nigeria Department of Nursing Adeleke University Ede Nigeria Department of Public Health Central University of Nicaragua Managua Nicaragua Faculty of Basic Clinical Sciences Lagos State University College of Medicine Ikeja Nigeria Catholic Relief Services Abuja Nigeria Department of Political Science Faculty of Social Sciences Bayero University Kano Kano Nigeria

Mpox disease is caused by a double-stranded DNA virus, genus Orthopoxvirus of the family Poxviridae. The incubation period is usually 6 to 13 days but can range from 5 to 21 days while symptoms and signs may persist for 2 to 5 weeks. Although, the clinical features are usually less severe when compared to the deadly smallpox, the disease can be fatal with case fatality rate between 1% and 10%. In Imo State, Nigeria, there has been a changing epidemiology of the disease in the last 6 years and the frequency and geographic distribution of cases have progressively increased. This study aims to conduct a review of the disease epidemiology between 2017 and 2023 and implications for surveillance in Imo State. Surveillance data from the Surveillance Outbreak Response and Management System (SORMAS) was extracted between January 2017 and December 2023 across the 27 Local Government Areas (LGAs) of Imo State. A line list of 231 suspected cases was downloaded into an excel template and analyzed using SPSS® version 20 software. Analysis was done using descriptive statistics and associations were tested using Fischer’s exact at 0.05 level of significance. Of the 231 suspected cases, 57.1% (132) were males, 42.9% (99) were females and the modal age group was between the ages of 0 - 4 (32.5%). Eight (8) LGAs (districts) accounted for 71% (n = 164) of all the suspected cases. 21.2% (49) were confirmed positive, 27 males (55.1%) and 22 females (44.9%) (p > 0.05). Modal age group was 20 - 24 (22.4%, n = 11), 18% (9) were children under 14 years, p > 0.05. Case fatality rate was 8% (n = 4). There was no significant association between mortality and age group. Five (5) LGAs accounted for about 60% (29) of all confirmed cases. These LGAs contribute only 20% to the total population in the State. Only 5.6% and 4% of suspected and confirmed cases, respectively, had knowledge of contact with an infectious source. The study described the epidemiology of Mpox outbreaks between 2017

关键词： Mpox Epidemiology Outbreak Surveillance

Physiological and Growth Responses of C_3 and C_4 Plants to Reduced Temperature When Grown at Low CO_2 of the Last Ice Age

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2008年第11期50卷 1388-1395页

作者： joy K.Ward David A.Myers Richard B.Thomas Department of Ecology and Evolutionary Biology University of Kansas Department of Biology West Virginia University

During the last ice age, CO2 concentration （[CO2]） was 180-200 umol/mol compared with the modern value of 380 umol/mol, and global temperatures were -8 ℃ cooler. Relatively little is known about the responses of C3 and C4 species to longterm exposure to glacial conditions. Here Abutilon theophrasti Medik. （C3） and Amaranthus retroflexus L. （C4） were grown at 200 umol/mol CO2 with current （30/24℃） and glacial （22/16℃） temperatures for 22d. Overall, the C4 species exhibited a large growth advantage over the C3 species at low [CO2]. However, this advantage was reduced at low temperature, where the C4 species produced 5x the total mass of the C3 species versus 14x at the high temperature. This difference was due to a reduction in C4 growth at low temperature, since the C3 species exhibited similar growth between temperatures. Physiological differences between temperatures were not detected for either species, although photorespiration/net photosynthesis was reduced in the C3 species grown at low temperature, suggesting evidence of improved carbon balance at this treatment. This system suggests that C4 species had a growth advantage over C3 species during low [CO2] of the last ice age, although concurrent reductions in temperatures may have reduced this advantage.

关键词： Abutilon theophrasti Amaranthus retroflexus C3 species C4 species climate change low CO2 low temperature photorespiration Pleistocene.