检索结果-南通市图书馆

Bioactive Materials 2020年第1期5卷 26-33页

作者： Afrah Al Hegy Ryan Smith Eric R.Gauthier joy E.Gray-Munro Dept.of chemistry and Biochemistry Laurentian UniversitySudburyOntarioP3E 2C6Canada

Magnesium and its alloys are promising candidates for a new generation of biodegradable metals in orthopaedic applications due to their excellent biocompatibility,biodegradability,and mechanical properties that are similar to natural ***,direct in vitro assessment of these materials in the presence of cells is complicated by degradation products from the alloy that lead to a false positive for the most commonly used cell adhesion and cell proliferation *** this paper,a cyanine dye was used to quantitatively evaluate the in vitro biocompatibility of a Mg AZ31 alloy by both direct and indirect *** cytotoxicity of the corrosion products was evaluated via an indirect method;a 25%decrease in cell viability compared to control samples was ***,direct assessment of cell adhesion and proliferation showed a statistically significant increase in cell number at the surface after 72 *** addition,the degradation rate and surface characteristics of the Mg AZ31 alloy were evaluated for both direct and indirect *** degradation rate was unaffected by the presence of cells while evidence of an increase in calcium phosphate deposition on the magnesium alloy surface in the presence of cells was *** study demonstrates that a cyanine dye based assay provides a more accurate assessment of the overall in vitro biocompatibility of biodegradable metals than the more commonly used assays reported in the literature to date.

关键词： Magnesium alloys Biocompatibility Direct method Indirect method cyanine dye cell adhesion cell proliferation cytotoxicity

Hoomii Singer Hugjiltu

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 Today 2015年第6期64卷 78-79页

作者： joy

HOOMII(Khoomei),or throat singing,is a vocal art where one person simultaneously sings two pitches up to six octaves apart,a rare *** a"living fossil of Mongolian folk music,"it is lauded as one of the"three treasures... 详细信息

关键词：歌手民间音乐活化石蒙古族小提琴艺术声乐

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

关于爱的家庭故事 joy和她的家庭摄影坊

人像摄影 2013年第2期 40-45页

作者： joy chen Photo caf摄影社区

正我的摄影工作室在加拿大的温哥华,属于这边最常见的家庭式的工作室,也就是用一个客厅外加一个房间来作为影棚。平时约在室内拍摄的客户很少,只有新生儿或者周岁内的宝宝会来,在国外90%以上的家庭还是更喜欢在室外或者自己的家中拍摄,... 详细信息

正我的摄影工作室在加拿大的温哥华,属于这边最常见的家庭式的工作室,也就是用一个客厅外加一个房间来作为影棚。平时约在室内拍摄的客户很少,只有新生儿或者周岁内的宝宝会来,在国外90%以上的家庭还是更喜欢在室外或者自己的家中拍摄,他们觉得这样最终出来的照片会更自然、轻松,也比较有纪念意义。其实我照片里景色的比重并不大,因为我更希望在一个简洁的环境中突显属于家庭那自然的爱的味道。所以就算树木不够茂盛,我觉得也没有什么,四季的变幻就是这样,每个季节都有值得纪念的美,但是我在选择拍摄环境的时候依然会有自己的一些法则。

关键词：家庭成员人像摄影摄影师工作室故事照片背景光圈焦距选择

correlations between structure,microstructure,density and dielectric properties of the lead-free ferroelectrics Bi_(0.5)(Na,K)_(0.5)TiO_(3)

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

Journal of Advanced Dielectrics 2015年第4期5卷 10-15页

作者： K.Anjali T.G.Ajithkumar P.A.joy Physical and Materials chemistry Division central NMR Facility Academy of Scientific and Innovative Research(AcSIR)cSIR-National chemical Laboratory(cSIR-NcL)Pune 411008 India

Solid solutions of the lead-free ferroelectric oxides Bi_(0.5)Na_(0.5)TiO_(3)(BNT)and Bi_(0.5)Na_(0.5)TiO_(3)(BKT),represented as(1-x)BNT-xBKT,are studied for very close compositions in the range0≤x≤0.36 to understand the correlation between the structure and the *** are varied in steps of △x=0.02 in the range0≤x≤0.1 and0.2≤x≤0.36 and△x=0.01 in the range 0.1≤x≤0.2,to precisely locate the structural transition as well as the morphotropic phase boundary(MPB)region and the compositional region of best *** refinement analysis of the powder X-ray diffraction patterns showed monoclinic phase up to x=0.17 and a mixture of monoclinic and tetragonal phases for x>***,the density and the dielectric constant showed linear variation up to x=0.17 and a large increase above this composition,showing maximum values in the compositional range 0.22≤x≤0.26,corresponding to the MPB *** features also showed corresponding changes,indicating close relationship between the structure,microstructure and properties of the different compositions.

关键词： Bismuth sodium potassium titanate Bi_(0.5)N_(0.5-x)KxTiO_(3) lead-free ferroelectrics morphotropic phase boundary structure-property correlations

Morphologic Response of a River channel to Sand Mining in River Tyaa,Kitui county,Kenya

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 Environmental & Earth Sciences 2020年第2期2卷 12-18页

作者： Philip Gathogo Muiruri joy A.Obando Ishmail O.Mahiri Department of Geography Kenyatta UniversityKenya43844Nairobi

Over 40 billion tons of sand is mined worldwide every year which isestimated to be higher than the natural replacement rates. In Kenya, therate of sand mining is raising concerns over its environmental effects sinceit is not regulated. This paper presents findings on the geomorphic effectsof sand mining in the ephemeral River Tyaa channel in Kitui county. Thestudy adopts the concept of feedback response mechanism of a naturalgeomorphic system. Through purposive sampling River Tyaa was selectedfor the study, where rampant sand mining was reportedly taking *** sampling on the five sand mining sites identified came up with arepresentative site namely Kanginga on which systematic sampling wasapplied while collecting data at both the active and control sites. Dataon channel width, depth and slope angles was obtained through physicalmeasurements while data on quantity of sand mined was obtained fromMwingi Sand Mining cooperative. Multiple logistic regression analysiswas used to analyse data whereby the model compared active and controlsites. Test results indicated that sand mining had significantly increasedriver channel’s width (O.R. =1.531), depth (O.R. =1.527) and slope angles(O.R. =1.634) at active mining sites compared to control sites as deducedfrom the respective Odds Ratios. It concluded that sand mining had alteredchannel’s morphology resulting to adverse environmental effects such asloss of riparian vegetation and channel incision. It recommended curbingof illegal sand mining through licencing operators and reducing quantity ofsand mined by closing some mines. Furthers, it recommended monitoringthrough regular Environmental Impact Assessment (E.I.A) and Audit (E.A)to inform protection of the river system from degrading.

关键词： channel incision Ephemeral stream Morphologic response Sand mining Sustainable development

Nong Fengmei and Her Esoteric Poya Song Book

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 Today 2015年第5期64卷 78-80页

作者： joy

Nong Fengmei,50,is a farmer and singer of the Zhuang ethnicity from Poya Village,Funing county,Wenshan Zhuang and Miao Autonomous Prefecture,in the frontier province of *** a cultural resources survey,local officials discovered in her home a piece of fabric bearing a time-honored script of81 pictographic *** turned out to be Zhuang folk *** is one of the few able to sing these

关键词：文化资源抚宁县壮族

Insights into the role of major bioactive dietary nutrients in lamb meat quality:a review

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 Animal Science and Biotechnology 2022年第4期13卷 951-966页

作者： JavierÁlvarez-Rodríguez Olaia Urrutia Sandra Lobón Guillermo Ripoll Juan Ramón Bertolín Margalida joy Departament de ciència Animal Universitat de Lleida25198 LleidaSpain Departamento de Agronomía Biotecnología y AlimentaciónIS-FOOD InstituteEscuela Técnica Superior de Ingeniería Agronómica y BiocienciasUniversidad Pública de NavarraPamplonaSpain centro de Investigación y Tecnología Agroalimentaria de Aragón(cITA) Avda.Montañana 93050059 ZaragozaSpain Instituto Agroalimentario de Aragón–IA2(cITA-Universidad de Zaragoza) Avda.Miguel Servet17750013 ZaragozaSpain.

Feed supplementation withα-linolenic acid(ALA)and linoleic acid(LA)increases their content in muscle,ALA increases n-3 polyunsaturated fatty acids and decrease n-6/n-3 ratio in muscle,and LA increases rumenic ***,high LA supplementation may have negative effects on lambs’lipid oxidative stability of *** the sources of ALA and LA are fed as fresh forage,the negative effects are counterbalanced by the presence of other bioactive compounds,as vitamin E(mainlyα-tocopherol)and polyphenols,which delay the lipid oxidation in *** is a wide consensus on the capability of vitamin E delaying lipid oxidation on lamb meat,and its feed content should be adjusted to the length of supplementation.A high dietary inclusion of proanthocyanidins,phenolic compounds and terpenes reduce the lipid oxidation in muscle and may improve the shelf life of meat,probably as a result of a combined effect with dietary vitamin ***,the recommended dietary inclusion levels depend on the polyphenol type and concentration and antioxidant capacity of the feedstuffs,which cannot be compared easily because no routine analytical grading methods are yet *** phenolic compounds content in dietary ingredients/supplements for lambs are reported,no specific association with animal physiology responses may be established.

关键词： Fatty acid Forage Oilseed Polyphenol Vitamin E

Optical parameters induced by phase transformation in RF magnetron sputtered TiO2 nanostructured thin films

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

Progress in Natural Science:Materials International 2014年第3期24卷 218-225页

作者： Prabitha B.Nair V.B.Justinvictor Georgi P.Daniel K.joy K.c.James Raju David Devraj Kumar P.V.Thomas Thin Film Lab Post Graduate and Research Department of Physics Mar Ivanios College 2. School of Physics University of Hyderabad Central University P. O. 3. College of Education Florida Atlantic University

Pure TiO2 thin films were deposited onto quartz substrates using a ceramic TiO2 target at an elevated substrate temperature of 573 K by RF magnetron sputtering, and an analysis of structural, optical and photoluminescence characteristics of the films upon phase transformation is reported in this paper. Structural investigations using X-ray diffraction revealed that the as-deposited film was amorphous in nature. Thermal annealing for 2 h at 873 K in air resulted in the formation of anatase phase, and a phase transformation to rutile was observed at 1073 *** increase in grain size and an improvement in crystallinity were also observed on annealing. Rod- like rutile crystallites were observed in the SEM images of the film annealed at 1273 K. As-deposited films and films annealed up to 1073 K were highly transparent in the visible region with a transparency 480%. Optical band gap of the films decreased upon thermal annealing which is attributed to phase transformation from amorphous to anatase and then to rutile. Optical parameters such as refractive index, optical conductivity and optical dielectric constant increased with increase in annealing temperature. Since rutile is the optically active phase, the superior refractive index of the film annealed at 1073 K along with its high transparency in visible region suggests the application of this film in antireflective coatings. Photoluminescence emission of maximum intensity was observed for the film annealed at 873 K, which exhibits anatase phase. Intense blue emission observed in this film makes it suitable for use in optoelectronic display devices.

关键词： RF magnetron sputtering TiO2thin films Dislocation density Optical conductivity Photoluminescence

Lubiprostone vs Senna in postoperative orthopedic surgery patients with opioid-induced constipation:A double-blind,active-comparator trial

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第43期20卷 16323-16333页

作者： christina M Marciniak Santiago Toledo Jungwhalia Lee Michael Jesselson Jillian Bateman Benjamin Grover joy Tierny Department of Physical Medicine and Rehabilitation School of MedicineNorthwestern UniversityChicagoIL 60611United States Department of Preventive Medicine Feinberg School of MedicineNorthwestern UniversityChicagoIL 60611United States University of chicago Medical center ChicagoIL 60637United States The Rehabilitation Institute of chicago ChicagoIL 60611United States chicago college of Osteopathic Medicine ChicagoIL 60515United States

AIM: To investigate the efficacy of lubiprostone compared to Senna on bowel symptoms and constipation in post-operative orthopedic patients treated with opioids.

关键词： constipation Opioids Lubiprostone Senna Orthopedics Rehabilitation

Biology of tooth replacement in amniotes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Oral Science 2013年第2期5卷 66-70页

作者： John A Whitlock joy M Richman Department of Oral Health Sciences Faculty of DentistryLife Sciences InstituteUniversity of British Columbia

Tooth replacement is a common trait to most vertebrates, including mammals. Mammals, however, have lost the capacity for continuous tooth renewal seen in most other vertebrates, and typically have only 1-2 generations of teeth. Here, we review the mechanisms of tooth replacement in reptiles and mammals, and discuss in detail the current and historical theories on control of timing and pattern of tooth replacement and development.

关键词： dental lamina growth factor signalling mammal epithelial stem cells diphyodonty polyphyodonty reptile successional lamina tooth replacement Zahnreihen, zone of inhibition