检索结果-南通市图书馆

Asian Journal of Andrology 2021年第3期23卷 306-313页

作者： Julio Bunay Luz-Maria Gallardo Jorge Luis Torres-Fuentes M Veronica Aguirre-Arias Renan Orellana nestor Sepulveda Ricardo D Moreno Physiology Department Faculty of Biological SciencesPontificia Universidad Cat6lica de Chile(PUC)Santiago 8331150Chile Department of Chemistry and Biological Sciences Health Sciences FacultyUniversidad Bernardo 0 HigginsSantiago 8370854Chile Center of Excellence in Biotechnology of Reproduction Universidad de la FronteraTemuco 4780000Chile.

Obesity is a major worldwide health problem that is related to most chronic diseases,including male *** to its wide impact on health,mechanisms underlying obesity-related infertility remain *** this study,we report that mice fed a high-fat diet(HFD)for over 2 months showed reduced fertility rates and increased germ cell apoptosis,seminiferous tubule degeneration,and decreased intratesticular estradiol(E2)and E2-to-testosterone ***,we also detected a decrease in testicular fatty acid levels,behenic acid(C22:0),and docosahexaenoic acid(DHA,22:6n-3),which may be related to the production of dysfunctional ***,we did not detect any changes in the frequency of seminiferous tubule stages,sperm count,or rate of in vitro ***,there was an increase in spontaneous and progesterone-induced acrosomal exocytosis(acrosome reaction)in spermatozoa from HFD-fed *** data suggest that a decrease in E2 and fatty acid levels influences spermatogenesis and some steps of acrosome biogenesis that will have consequences for ***,our results add new evidence about the adverse effect of obesity in male reproduction and suggest that the acrosomal reaction can also be affected under this condition.

关键词： cholesterol estradiol fat acid testis testosterone

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

用主振荡型分析预报南方涛动状态（上）

北京气象 1992年第3期 36-37,22页

作者： Xu,JS stor.,fu

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

冬眠期宾夕法尼亚黑熊的血液化学

吉林农业大学译丛 1989年第3期 18-20页

作者： stor.,GL 王全凯

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

雀点厂L高炉炉腹的快速中修

国外钢铁 1995年第10期20卷 5-10,18页

作者： stor.,LP 谭学琦

雀点厂Ｌ高炉（工作容积３０８３ｍ＾３）前两代炉役中炉腹寿命大约为６年，第３代炉役开始于１９９０年６月，投产２年后炉腹内衬迅速蚀损。１９９３年３月开始中修，４月９日复风，１５日出铁８０００ｔ／ａ，投产１０个月发现损坏，... 详细信息

雀点厂Ｌ高炉（工作容积３０８３ｍ＾３）前两代炉役中炉腹寿命大约为６年，第３代炉役开始于１９９０年６月，投产２年后炉腹内衬迅速蚀损。１９９３年３月开始中修，４月９日复风，１５日出铁８０００ｔ／ａ，投产１０个月发现损坏，炉况良好，本次炉腹中修所用的工作方法和技术措施极为成功。

关键词：高炉炉腹检修冷却器

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

内存的秘密——轻松看透内存条

电脑爱好者 2004年第9期 93-94页

作者： www.stor—age.comZXM

近期内存价格暴涨,不少用户会因此暂停电脑购买计划。这时的销售商们经常会推荐一些价格低廉的“国际名牌”内存,来降低用户的购机成本。但这些内存也许在短时间内使用没有问题,但时间一长就会造成系统不稳定,最终内存完全损坏,短时间... 详细信息

近期内存价格暴涨,不少用户会因此暂停电脑购买计划。这时的销售商们经常会推荐一些价格低廉的“国际名牌”内存,来降低用户的购机成本。但这些内存也许在短时间内使用没有问题,但时间一长就会造成系统不稳定,最终内存完全损坏,短时间的节省带来的却是长时间的烦恼,怎么会出现这种问题呢?我们就花两期来谈谈内存,这个电脑中最重要的配件之一的选购。

关键词：内存 PC 厂商商人模组时序参数内存芯片秘密

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

比特币未退烧比特币矿工的军备竞赛正在升温

商业周刊（中文版） 2014年第2期 74-79页

作者： Ashlee Vance Brad stor Jake Stangel(摄影)

乔·弗利金杰（Joel Flickinger）的家位于美国加利福尼亚州奥克兰的一座山坡上，有两间卧室，屋里到处都是嗡嗡作响的定制电脑设备。一进门，在一个一般家庭可能会用作书房的房间里，他在壁炉旁放了一张桌子，上面摆着一台巨大的显示... 详细信息

乔·弗利金杰（Joel Flickinger）的家位于美国加利福尼亚州奥克兰的一座山坡上，有两间卧室，屋里到处都是嗡嗡作响的定制电脑设备。一进门，在一个一般家庭可能会用作书房的房间里，他在壁炉旁放了一张桌子，上面摆着一台巨大的显示器，左右两边的电线连着两台电脑主机，每个主机大约有一箱啤酒那么大。弗利金杰花了两万多美元来购置这些设备以及放在地下室的一台速度较慢的电脑。这些电脑连续不停地运转，发出的热量足以让屋子保暖，每个月光电费就高达400美元。屋子里没有什么装饰，只有一些手写的便条纸，上而的话语充满了正能量：

关键词：军备竞赛比特电脑设备矿工加利福尼亚州奥克兰显示器地下室

<i>Ab Initio</i>Molecular Orbital Calculation for Optical and Electronic Properties Evaluation of Small and Medium Size Silicon nano-Clusters Found in Silicon Rich Oxide Films

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 Modern Physics 2013年第11期4卷 1-26页

作者： néstor David Espinosa Torres José Francisco Javier Flores Gracia José Alberto Luna López Juan Carlos Ramírez García Alfredo Morales Sánchez José Luis Sosa Sánchez David Hernández de la Luz Francisco Morales Morales Research Center for Advanced Materials S.C. Unit Monterrey-PIIT Apodaca México Research Center for Semiconductor Devices CIDS-ICUAP-BUAP Puebla México The Faculty of Chemical Sciences BUAP Puebla México

In systems in atomic and nano scales such as clusters or agglomerates constituted of particles from a few to less than one hundred of atoms, quantum confinement effects are very important. Their optical and electronic properties are often dependent on the size of the systems and the way in which the atoms in these clusters are bonded. Generally, these nano-structures display optical and electronic properties significantly different of those found in corresponding bulk materials. Silicon agglomerates found in Silicon Rich Oxide (SRO) films have optical properties, which have reported as depended directly on nano-crystal size. Furthermore, the room temperature photoluminescence (PL) of Silicon Rich Oxides (SRO) has repeatedly generated a huge interest due to their possible applications in optoelectronic devices. However, a plausible emission mechanism has not yet widespread acceptance of the scientific community. In this research, we employed the Density Functional Theory with a functional B3LYP and a basis set 6 - 31G* to calculate the optical and electronic properties of small (six to ten silicon atoms) and medium size clusters of silicon (constituted of eleven to fourteen silicon atoms). With the theoretical calculation of the structural and optical properties of silicon clusters, it is possible to evaluate the contribution of silicon agglomerates in the luminescent emission mechanism experimentally found in thin SRO films.

关键词： nano-Crystals Silicon Clusters Silicon-Rich Oxide Luminescence Magic-number

Ecology,growth and management of black locust(Robinia pseudoacacia L.),a non-native species integrated into European forests

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 Forestry Research 2020年第4期31卷 1081-1101页

作者： Valeriu-norocel nicolescu Károly Rédei William L.Mason Torsten Vor Elisabeth Poetzelsberger Jean-Charles Bastien Robert Brus Tibor Bencat MartinaDodan Branislav Cvjetkovic Sinisa Andrasev nicola La Porta Vasyl Lavnyy Dejan Mandzukovski Krasimira Petkova Dusan Rozenbergar Radoslaw Wasik Godefridus M.J.Mohren Maria Cristina Monteverdi Brigitte Musch Marcin Klisz Sanja Peric Ljiljana Keca Debbie Bartlett Cornelia Hernea Michal Pástor Faculty of Silviculture and Forest Engineering Transylvania University of Brasov500123 BrasovRomania Forest Research Institute Budapest 9600Hungary Forest Research Northern Research StationRoslinMidlothian EH259SYUK Faculty of Forest Sciences and Forest Ecology University Georg-August37077 GöttingenGermany University of natural Resources and Life Sciences Peter Jordan Str.821190 ViennaAustria InRA Centre Val de Loire 45075 ArdonOrléansFrance Biotechnical Faculty University of Ljubljana1000 LjubljanaSlovenia Technical University Ul.T.G.Masaryka 2496053 ZvolenSlovakia Croatian Forest Research Institute 10450 JastrebarskoCroatia Faculty of Forestry University of Banja LukaStepe Stepanovica 75a78000 Banja LukaBosnia and Herzegovina Institute of Lowland Forestry and Environment AntonaČehova 13dNovi Sad 21000Serbia Fondazione Edmund Mach Via E.Mach 138010 S.Michele a/AdigeItaly Department of Silviculture Ukrainian National Forestry UniversityL’viv 79057Ukraine Public enterprise Makedonski sumi Pero Nakov bbKosta Novakovic 12Skopje 1000Republic of North Macedonia University of Forestry 1797 Sofi aBulgaria Faculty of Forestry University of Agriculture31-425 KrakówPoland Department of Forest Ecology and Forest Management Group University of Wageningen6700 WageningenThe Netherlands Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria Viale Santa Margherita8052100 ArezzoItaly UMR 0588 INRA ONF BioForA2163 Avenue de la Pomme de PinCS 4000145075 ArdonOrléans CedexFrance Forest Research Institute Braci Lesnej Streetno.305-090 Sekocin StaryRaszynPoland Faculty of Forestry University of Belgrade1Kneza Viseslava StreetBelgrade 11030Serbia Faculty of Engineering and Science University of GreenwichCentral AvenueChatham MaritimeLondon ME44TBUK Faculty of Horticulture and Forestry Banat’s University of Agricultural Sciences and Veterinary Medicine300645 TimisoaraRomania national Forest Centre Forest Research InstituteT.G.Masaryka 2296092 ZvolenSlovakia

Black locust(Robinia pseudoacacia L.),a species native to the eastern north America,was introduced to Europe probably in 1601 and currently extends over2.3×10~6 *** has become naturalized in all sub-Mediterranean and temperate regions rivaling Populus *** the second most planted broadleaved tree species worldwide after Eucalyptus *** wide-spreading planting is because black locust is an important multipurpose species,producing wood,fodder,and a source of honey as well as bio-oil and *** is also important for carbon sequestration,soil stabilization and re-vegetation of landfills,mining areas and wastelands,in biotherapy and *** Europe,black locust is drought tolerant so grows in areas with annual precipitation as low as 500-550 *** tolerates dry,nutrient poor soils but grows best on deep,nutrient-rich,well-drained *** is a fast-growing tree and the height,diameter and volume growth peak before the age of *** mostly regenerates vegetatively by root suckers under a simple coppice system,which is considered the most cost-effective management *** also regenerates,but less frequently,by stool *** early silviculture in production forests includes release cutting to promote root suckers rather than stool shoots,and cleaning-respacing to remove low-quality stems,reduce the number of shoots per stool,and adjust spacing between root *** addition,early,moderate and frequent thinning as well as limited pruning are carried out focusing on crop *** species is regarded as invasive in several European countries and its range here is expected to expand under predicted climate changes.

关键词： Black locust Ecology Invasiveness Climate change Management

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

白马骑士

白马骑士

Influence of Stainless Steel Weld Microstructure on Its Seawater Corrosion Performance

1982年

作者：（德）特奥多尔·施托姆（T.stor）王克澄译

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

材料科学与工程（中英文版） 2011年第1期5卷 65-70页

作者： Santilláin néstor Valdez Benjamin Schorr Miguel Carrillo Mónica Martinez Alejandro Colton Samuel Universidad Autonoma de Baja California Instituto de Ingenieria Mexicali B.C. 21280 Mexico Universidad Autonoma de Baja California Facultad de Ciencias Ensenada B.C. 22800 Mexico Arizona Western College Main Campus Yuma AZ 85365 USA

Austenitic stainless steels (SS) (e. g., UnS S30403) are used for the fabrication of equipment and structures operating in marine environments. Frequently, their parts are joined by welding applying conventional techniques such as flux core arc welding (FCAW) and gas tungsten arc welding (GTAW). The aim of this investigation was to determine the influence of the microstructure of non-welded and welded S30403, including the heat-affected zone (HAZ), on their corrosion performance, when exposed to seawater in the laboratory. The experimental techniques involve electrochemical potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), electrochemical potentiokinetic reactivation (EPR) and surface characterization with a scanning electron microscope (SEM). Data obtained from the Bode and nyquist diagrams correspond to a high resistance to charge transfer in the FCAW-weldzone and GTAW-HAZ zone. On the other hand, an unstable behaviour was reflected in the FCAW-HAZ zone and GTAW-weld zone at low frequency but an important corrosion process occurs at the FCAW-HAZ in a wide frequency range. These analyses were compared with the polarization results previously reported. The results of the EPR tests correspond to a small tendency to sensitization. The metallographic analysis depicts a high density of carbides precipitation on the FCAW-HAZ zone, while a significant decrease is observed in the GTAW-HAZ zone. In both cases the electron dispersive energy X-ray (EDX) analyses detects concentration of C, Cr and Fe. A complete setting of electrochemical results and its interpretation is presented.

关键词：不锈钢焊接海水腐蚀耐蚀性能药芯焊丝电弧焊焊接热影响区电化学阻抗谱扫描电子显微镜钨极氩弧焊