简介：一、问题的提出我系应用电子专业学制三年,近几年来学生毕业后绝大部分分配到县、区乡镇企业工作,这些单位往往技术人员少,既生产又经营,一人顶多人用,同时还经常和外商打交道,这些单位迫切要求我们的毕业生要一专多能,适应改革开放形势的需要,具有较强的独立工作能力,既要有解决生产中具体技术问题的能力,又要有行政管理、技术管理的能力,同时还要有外语会话能力、计算机操作能力.总之,他们需要的是应用型、职业型、综合型的人才.为了适应社会的这种新情况、新要求,我们对传统的“2.5+0.5”的教学模式进行了适当的改革,提出了“2+0.5+0.5”的新教学模式,并制定了相应的教学计划.

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简介：我校在中文系的92文科班,电子系的62电气班进行教学改革,试行“2+0.5+0.5”教学模式,即三年学制前二年完成理论课教学任务;接着文秘班的机关,电气班的工厂进行为期半年实践;回校后再用半年时间补缺、毕业设计、论文答辨和毕业考试等.这次实践半年回来后进行总结,学生、实践单位领导和指导教师都认为这次改革是成功的,希望今后推广和坚持.

简介：摘要校企合作、工学结合是职业教育发展的必由之路，本文在工学结合的基础上，提出了“2+0.5+0.5”人才培养模式，并以电子技术应用专业为例，对模式的内涵进行了阐释，对实践中取得的成效和发现的问题进行了总结和反思。

简介：我恍然大悟,原来他们把邮费也退给了我。柏林是德国的首都,也是德国最大的城市,它不仅是德国的政治经济文化中心,而且拥有世界上最好的公共交通系统,航空、铁路、高速公路的平均长度都居于发达国家首位。在这个城市大点的轻轨站和地铁站,都设有一个刷了红色油漆的小型自动照相馆,即类似中国公用电话亭的小房子。自动照相馆的操作方法很简单,你只需在投币处放进5欧元,坐进去摆好姿势,待准

简介：Thefullpotentiallinearizedaugmentedplanewave(FLAPW)methodisusedtostudythecrystalstructureandelectronicstructurepropertiesofPbFeo.5Nbo.5O3(PFN).Theoptimizedcrystalstructure,densityofstates,bandstructureandelectrondensitydistributionhavebeenobtainedtounderstandtheferroelectricbehaviourofPFN.TheanalysisresultofthedensityofstatesshowsthereisanobviouschangeofNbdstatesintheparaelectric-to-ferroelectricphasetransition.ThepolarizationresultshowsthatthecontributiontoferroelectricityofNbatomsislargerthanthatofFeatoms.InferroelectricphasethereisahybridizationofFed-OpandNbd-OpinferroelectricPFN.Thisisconsistentwiththeresultoftheelectronicbandstructure.Thishybridizationisresponsibleforthetendencytoitsferroelectricity.

简介：Synthesis,structureandmagneticpropertiesofRudopedperovskitestructuredmanganiteLa0.5Sr0.5MnO3wereinvestigatedexperimentally.Ahydrothermalmethodwasusedforthepreparationofthesamples.Ahigh-temperatureannealingprocesswasalsoemployedtomakeacomparison.AslightlyenhancementoftheunitcellvolumewasobservedwiththeincreaseofRuconcentration.Scanningelectronmicroscopyshowsthatthematerialsaremadeupofcube-shapedparticleswithdimensionofseveralmicrometers.Importantly,itisfoundthatboththeCurietemperatureTCandsaturationmomentcanbereducedbyRudoping.ThevalueofcoercivefieldisnotaffectedbytheintroductionofRu.

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简介：Sm0.5Sr0.5CoO3的样品在不同气氛(Ar，N2，和O2)和温度被退火(4001200?獡吗？

简介：非常不幸，据说，我们生活在一个数字时代。因此，我们的一切生活细节都是可以被量化的。

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简介：Theoptimumparametersarecalculatedbythelargecross-sectiontheoryandmodecut-offequation.Theeffectonreversebiasvoltagesinanalysedbythedopingconcentrationinn^+-Si.Theissignificantbecausethereversebiasincreasessharplywhenthedopedconcentrationinn^+-Siislessthan1×10^20cm^-3.

简介：反的尖晶石类型金属氧化物，magnesium-manganese-titanium氧化物(Mg2Mn0.5Ti0.5O4)，用coprecipitation/thermal结晶化方法被准备。有这材料的抽取/插入反应被X光检查，交换的浸透能力，pH滴定，和分发系数(Kd)测量调查。Mg2Mn0.5Ti0.5O4的酸处理引起了Mg2+超过81%的抽取，而Mn4+和Ti4+的溶解是不到10%。试验性的结果证明酸处理的样品有交换56mg的一个能力

简介：Metalsilver(Ag)wasaddedintoSm0.5Sr0.5CoO3(SSC)bynitratepyrolysismethodtoobtainporouscathodematerial(SSC-Agx)forSOFC.ThecompositephasesinthesematerialsofSSC-AgxwereidentifiedbyX-raydiffraction.ThemicrostructureofanelectrodeonCe0.sSm0.2O1.9intermediatetempera-tureelectrolytebyspraymethod,polarizationcurveandtheimperaturepedancespectraatlowandintermediate(500-800℃)wereinvestigated.Theresultsshowthatthematerialcontaining20%Agexhibitsthebestelectrochemicalproperties,itstotalimpedanceofcathodeisonly1/11ofSSCat600℃,andaquarterofSSCsat750℃.Thecompositetech-niqueofcathodeSm0.5Sr0.5CoO3addedwithAgisanefficientmethodtoimprovethecathodeperformanceofSOFCsoperatingintherangeofintermediatetempera-ture.

简介：“望”：病例观察在一节“钉子板上的多边形”课上，教师发给每人一个钉子板作学具。一位学生在钉子板上围出了这样一个多边形（如图1）。多边形边上的钉子数是9，多边形内的钉子数是18，代入皮克公式计算得到：9÷2＋18-1=21.5。

简介：在惰性气体雾化法制备的Fe-1．1Ni-0．5Mo-0．5Cr预合金粉末中添加1．5％的Cu粉和0．6％的C粉（均为质量分数）以及还原铁粉（添加量分别为0、10％、20％和30％），混合均匀后在600MPa压力下模压，在1180℃烧结1h。烧结合金经180℃／1h回火处理后，进行密度、硬度、拉伸力学性能检测以及显微组织观察。结果表明，添加还原铁粉后，合金的密度和强度大幅度提高，并保持高硬度状态。金相组织主要为回火马氏体组织，并随还原铁粉添加量增加，出现一定量的珠光体、下贝氏体以及上贝氏体组织。在添加20％还原铁粉时合金的综合性能最好，密度为6．85g／cm3，硬度达到43HRC，抗拉强度为650MPa。添加还原铁粉有利于粉末压制成形以及提高合金的力学性能。

简介：本实验采用柠檬酸盐法制备（NaBi）0.5TiO3无铅压电陶瓷粉体,系统研究了柠檬酸浓度、溶液pH值、煅烧温度等工艺条件对制备的影响。经研究分析,当柠檬酸浓度C=9%,溶液pH=7.5时,能形成透明、均匀、稳定的溶胶,且形成时间最短;650℃下煅烧2h能够合成单一的钙钛矿结构的钛酸铋钠晶相,比传统固相反应法煅烧温度降低了200℃。

简介：AbstractBackground:Few studies have assessed the relationship between multimorbidity patterns and mortality risk in the Chinese population. We aimed to identify multimorbidity patterns and examined the associations of multimorbidity patterns and the number of chronic diseases with the risk of mortality among Chinese middle-aged and older adults.Methods:We used data from the China Kadoorie Biobank and included 512,723 participants aged 30 to 79 years. Multimorbidity was defined as the presence of two or more of the 15 chronic diseases collected by self-report or physical examination at baseline. Multimorbidity patterns were identified using hierarchical cluster analysis. Cox regression was used to estimate the associations of multimorbidity patterns and the number of chronic diseases with all-cause and cause-specific mortality.Results:Overall, 15.8% of participants had multimorbidity. The prevalence of multimorbidity increased with age and was higher in urban than rural participants. Four multimorbidity patterns were identified, including cardiometabolic multimorbidity (diabetes, coronary heart disease, stroke, and hypertension), respiratory multimorbidity (tuberculosis, asthma, and chronic obstructive pulmonary disease), gastrointestinal and hepatorenal multimorbidity (gallstone disease, chronic kidney disease, cirrhosis, peptic ulcer, and cancer), and mental and arthritis multimorbidity (neurasthenia, psychiatric disorder, and rheumatoid arthritis). During a median of 10.8 years of follow-up, 49,371 deaths occurred. Compared with participants without multimorbidity, cardiometabolic multimorbidity (hazard ratios [HR] = 2.20, 95% confidence intervals [CI]: 2.14-2.26) and respiratory multimorbidity (HR= 2.13, 95% CI:1.97-2.31) demonstrated relatively higher risks of mortality, followed by gastrointestinal and hepatorenal multimorbidity (HR= 1.33, 95% CI:1.22-1.46). The mortality risk increased by 36% (HR= 1.36, 95% CI: 1.35-1.37) with every additional disease.Conclusion:Cardiometabolic multimorbidity and respiratory multimorbidity posed the highest threat on mortality risk and deserved particular attention in Chinese adults.

简介：英国剑桥大学、新加坡数据存储研究所与新加坡技术和设计大学的科学家经过研究发现，用可以在不同电状态间快速来回切换的相变材料替代硅，他们有望研制出信息处理速度快1000倍且更小、更环保的计算机。研究发表在最新一期的美国《国家科学院学报》上。

简介：The0.5Mt/astyreneunitatDaguChemicalPlanthadsuccessfullyonJanuary21,2010acceptedethylenefeeddeliveredbythe1.0Mt/aethyleneunitoftheTianjinPetrochemicalCompanyandhadbeenstartedupatthefirstattempton