检索结果-南通市图书馆

Recovery of Cyclospora cayetanensis among asymptomatic rural Thai schoolchildren

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2014年第2期7卷 119-123页

作者： K Thima h Mori R Praevanit s Mongkhonmu J Waikagul D Watthanakulpanich Department of Protozoology Faculty of Tropical MedicineMahidol University Bangkok school of Tropical Medicine Mahidol University Department of helminthology Faculty of Tropical MedicineMahidol University

Objective:To obtain the prevalence with clinical symptoms of Cyclospora cayetanensis(***),a coceidian protozoan parasite,in Thailand which is the cause of an intestinal infection characterized by sporadic-to-frequent explosive ***:In a field surveyconducted by the Faculty of Tropical *** *** part of the existing parasite-control program,a total of 2 540 faecal samples from villagers in Nan Province,Thailand,were collected and examined to determine the prevalence and clinical characteristics of parasitic ***:Twelve cases of *** infection were found duritig faecal examination of schoolchildren aged 5-12 *** exhibited obvious clinical symptoms,especially evidence of diarrhea:5 of 12 had loose faeces,one reported frequent symptoms of abdominal discomfort,and another had pale conjunctiva with low *** children were generally ***:Th.s.finding confirms a public-health issue with potentially serious consequences whereby children can be exposed to an environment contaminated with food-und water-borne transmitted oocysts,anil can hence become infected with ***.

关键词： Cyclospora cayetanensis schoolchildren Carriers Traveler’s diarrhea

Rock composition and origin of the Duwi Formation calcareous rocks, Upper Egypt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2005年第4期24卷 316-326页

作者： Baioumy h.M. Attia A.M. Boulis s.N. h.s.an M.s. helmy M.E. Central Metallurgical Research and Development Institute 87 Helwan Cairo EgyptCentral Metallurgical Research and Development Institute 87 Helwan Cairo EgyptCentral Metallurgical Research and Development Institute 87 Helwan Cairo EgyptCentral Metallurgical Research and Development Institute 87 Helwan Cairo EgyptGeology Dept. Faculty of Science Ain Shams University Abbasia Cairo Egypt

Upper Cretaceous ph.s.horite beds of the Duwi Formation, Upper Egypt, are intercalated with limestone, sandy limestone, marl, calcareous shales, and calcareous sandstone. Calcareous intercalations were subjected to field and detailed petrographic, mineralogical and geochemical investigations in order to constrain their rock composition and origin.; Mineralogically, dolomite, calcite, quartz, francolite and feldspars are the non-clay minerals. smectite, kaolinite and illite represent the clay minerals. Major and trace elements can be classified as the detrital and carbonate fractions based on their sources. The detrital fraction includes the elements that are derived from detrital sources, mainly clay minerals and quartz, such as si, Al, Fe, Ti, K, Ba, V, Ni, Co, Cr, Zn, Cu, Zr, and Mo. The carbonate fraction includes the elements that are derived from carbonates, maily calcite and dolomite, such as Ca, Mg and sr. ; Dolomite occurs as being dense, uniform, mosaic, very fine-to-fine, non-ferroan, and non-stoichiometrical, suggesting its early diagenetic formation in a near-shore oxidizing shallow marine environment. The close association and positive correlation between dolomite and smectite indicates the role of clay minerals in the formation of dolomite as a source of Mgh-rich.s.lutions.; Calcareous rocks were deposited in marine, oxidizing and weakly alkaline conditions, marking a semi-arid climatic period. The calcareous/argillaceous alternations are due to oscillations in clay/carbonate ratio.

关键词：岩石埃及石灰质白云石成岩作用

Buffalo stirred yoghurt fortified with grape seed extract:New insigh.s.into its functional properties

在线全文

学校读者我要写书评

暂无评论

Food Bioscience 2022年第3期47卷 1330-1336页

作者： suzan h.Tami Esmat Aly Aliaa A.Darwish Esmat s.Mohamed Department of Clinical Nutrition College of Applied Medical SciencesKing Faisal UniversitySaudi Arabia Dairy Research Department Food Technology Research InstituteAgricultural Research Center12613GizaEgypt Biotechnology Department Higher Institute for Agriculture Co-Operation13766ShobraCairoEgypt

Grape seed extract(GsE)is considered one of the major byproducts,which are rich in phenolic content and possess several health-promoting activities including antibacterial,anticancer,and *** current research was devoted to improve the bioactive properties of stirred yoghurt through.s.pplementation with GsE at three concentrations(0.1,0.25,and 0.5 g/100 g yoghurt).The obtained stirred yoghurts were analyzed for determining their composition,ph.s.neresis,viscosity,and sensory ***,some functional properties including antioxidant,antibacterial,anticancer activities were *** increments(p≤0.05)were observed in total solids,ash contents,ph,water holding capacity,and viscosity values,especially when 0.5%GsE was ***,adding 0.5%GsE showed higher(p≤0.05)in vitro antioxidant,antibacterial,and anticancer ***,the improved bioactive properties resulting from adding GsE,even at the higher concentration,were not accompanied by any change in sensory *** particular,the color descriptor was mostly preferred by panelists when 0.5%GsE was *** assessors did not observe any off-flavors in any of the tested stirred yoghurt ***,the functional properties of stirred yoghurt could be improved by adding GsE preparation without affecting its organoleptic properties.

关键词： stirred yoghurt Grape seed extract Bioactive properties Antibacterial and anticancer activities Antioxidant

sTUDY ON NUMERICAL sIMULATION OF CAsTING ThERMAL sTREssEs BAsED ON FDM

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica sinica(English Letters) 2004年第1期17卷 7-10页

作者： J.J.Yan L.L.Chen D.M.Liao h.T.Lin R.X.liu College of Materials Huazhong University of Science and TechnologyWuhan 430074ChinaMechanic DepartmentThe University of Iowa Iowa CityIA 52246USACollege of MaterialsHuazhong University of Science and TechnologyWuhan 430074ChinaCollege of MaterialsHuazhong University of Science and TechnologyWuhan 430074ChinaCollege of MaterialsHuazhong University of Science and TechnologyWuhan 430074China

A system for the numerical simulation of 3D temperature and stress fields during casting process was studied, developed and practiced based on finite difference method (FDM) in th.s.paper. An approach where the stress/strain and the heat transfer analysis use the same computational domain was presented, which avoided transferring temperature data between FDM and FEM nodes and elements. A slot-board steel casting was simulated and the calculated results are in agreements with th.s. obtained from practical producing.

关键词： thermal stress field numerical simulation FDM

Using graphene to suppress the selenization of Pt for controllable fabrication of monolayer Ptse2

在线全文

学校读者我要写书评

暂无评论

Nano Research 2020年第12期13卷 3212-3216页

作者： Zhong-liu liu Zhi-Li Zhu Xu Wu Jin-An shi Wu Zhou Li-Wei liu Ye-Liang Wang hong-Jun Gao Institute of Ph.s.cs and University of Chinese Academy of sciences Chinese Academy of SciencesBeijing100190China school of Information and Electronics MIIT Key Laboratory for Low-Dimensional Quantum Structure and DevicesBeijing Institute of TechnologyBeijing100081China CAs Center for Excellence in Topological Quantum Computation Beijing100049China

Platinum diselenide(Ptse2)is a promising transition metal dichalcogenide(TMDC)material with unique *** is necessary to find a controllable fabrication method to bridge Ptse2 with other two-dimensional(2D)materials for practical applications,which h.s.rarely been reported so ***,we report that the selenization of Pt(111)can be suppressed to form a se intercalated layer,instead of a Ptse2 monolayer,by inducing confined conditions with a precoating of *** with graphene-island samples demonstrate that the monolayer Ptse2 can be controllably fabricated only on the bare Pt surface,while the se intercalated layer is formed underneath graphene,as verified by atomic-resolution observations with.s.anning transmission electron microscopy(sTEM)and scanning tunneling microscopy(sTM).In addition,the orientation of the graphene island shows a negligible influence on the se intercalated layer induced by the graphene *** extending the application of 2D confined reactions,th.s.work provides a new method to control the fabrication and pattern 2D materials during the fabrication process.

关键词： Ptse2 graphene confined reaction selenization intercalation

Role of Carbonic Anhydrase as an Activator in Carbonate Rock Dissolution and Its Implication for Atmospheric CO_(2)sink

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica sinica(English Edition) 2001年第3期75卷 275-278页

作者： liu Zaihua Karst Dynamics Laboratory of MLR Institute of Karst Geology Chinese Academy of Geological Sciences50 Qixing RoadGuilin 541004

The conversion of CO2 into h+ and is a relatively slow reaction. hence, its kinetics may be rate determining in carbonate rock dissolution. Carbonic anhydrase (CA), which is widespread in nature, was used to catalyze the CO2 conversion process in dissolution experiments of limestone and dolomite. It was found that the rate of dissolution increases by a factor of about 10 after the addition of CA at a high CO2 partial pressure (Pco2) for limestone and about 3 at low Pco2 for dolomite. Th.s.shows that reappraisal is necessary for the importance of chemical weathering (including carbonate rock dissolution and silicate weathering) in the atmospheric CO2 sink and the mysterious missing sink in carbon cycling. It is doubtless that previous studies of weathering underestimated weathering rates due to the ignorance of CA as an activator in weathering, th.s.the contribution of weathering to the atmospheric CO2 sink is also underestimated. Th.s.finding also shows the need to examine the situ distribution and activity of CA in different waters and to investigate the role of CA in weathering.

关键词： carbonic anhydrase CO_(2)conversion carbonate rock dissolution atmospheric CO_(2)sink

Effect of sr_(2) TiMnO_(6) fillers on mechanical, dielectric and thermal behaviour of PMMA polymer

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2015年第3期5卷 1-11页

作者： P.Thomas B.s.Dakshayini h.s.Kushwaha Rahul Vaish Dielectric Materials Division Central Power Research Institute BangaloreKarnataka 560080India Aerospace Engineering Indian Institute of Science BangaloreKarnataka 560012India school of Engineering Indian Institute of Technology Mandi Himachal Pradesh 175001India

Composites of poly(methyl methacrylate)(PMMA)and sr_(2) TiMnO_(6)(sTMO)were fabricated via melt mixing followed by hot pressing *** were characterized using X-ray diffraction(XRD),thermo gravimetric analysis(TGA),differential scanning calorimetry(DsC),thermo mechanical analysis(TMA)and impedance analyser for their structural,thermal and dielectric *** coefficient of thermal expansion(CTE)was measured between 40℃ and 100℃ for pure PMMA is 115.2ppm/℃,which was decreased to 78.58ppm/℃ when the sTMO content was increased to 50 wt.%in *** was no difference in the glass transition(T g)temperature of the PMMA polymer and their ***,the FTIR analysis indicated possible interaction between the PMMA and *** density and the hardness were increased as the sTMO content increased in the PMMA *** was found to be as high as 30.9 at 100hz for the PMMAþsTMO-50 wt.%composites,indicating the possibility of using th.s. materials for capacitor *** thermal stability of polymer was enhanced by incorporation of sTMO fillers.

关键词： Polymer composite dielectric properties mechanical properties thermal properties

statistical properties of Chinese semantic networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese science Bulletin 2009年第16期54卷 2781-2785页

作者： liu haiTao Institute of Applied Linguistics Communication University of China Beijing 100024 China

Almost all language networks in word and syntactic levels are small-world and scale-free. Th.s.raises the questions of whether a language network in deeper semantic or cognitive level also h.s.the similar properties. To answer the question, we built up a Chinese semantic network based on a treebank with.s.mantic role (argument structure) annotation and investigated its global statistical properties. The results show that although.s.mantic network is also small-world and scale-free, it is different from syntactic network in hierarchical structure and K-Nearest-Neighbor correlation.

关键词：语义网络统计性质汉语参数结构统计特性层次结构小世界标度

Deleting a marked state in quantum database in a duality computing mode

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 2013年第24期58卷 2927-2931页

作者： liu Yang school of Nuclear science and Engineering North China Electric Power University Department of Ph.s.cs Tsinghua University

In th.s.article, we present a deletion algorithm in the duality computer that deletes a marked state from an even superposition of all basis-states with certainty. Th.s.duality computer deletion algorithm requires a single query, and th.s.achieves exponential speedup over classical algorithm. Using a duality mode and recycling quantum computing, we provide a realization of th.s.duality computer deletion algorithm in quantum computer.

关键词：量子计算机删除状态计算模式标记对偶数据库经典算法