简介：Inthisarticle,wecalculatethecontributionfromthenonfactorizablesofthadronicmatrixelementtothedecayB~0→χc1~π~0withthelight-conequantumchromo-dynamic(QCD)sumrules.Thenumericalresultsshowthatitscontributionisratherlargeandshouldnotbeneglected.Thetotalamplitudesleadtoabranchingfractionwhichisinagreementwiththeexperimentaldatamarginally.

简介：提到极为出色的奏鸣曲组合，奥伊斯特拉赫和奥柏林两位的组合一定不能不提。两位黄金时代的苏联音乐家联手录制了大量奏鸣曲唱片。无论是爱乐者亦或是发烧友，都对他们两位的唱片疯狂追捧，以至于他们两位录制的黑胶唱片价格一直是居高不下。

简介：你是否测量过自己的“心情温度”？它时而平静得只有0℃，时而受寒下降到零下，时而又直线上升，沸腾到100℃。每一天，我们的心情都在经历着不同温度的变化，你能写下心情温度的变化故事吗？写下来吧，让大家的温度集合在一起，突破100℃!

简介：针对积分中值定理的两种叙述方式和证明阐述了个人的观点,同时探讨了用积分中值定理求证被积函数与自然数有关的定积分的极限的误区及解决问题的思想方法.

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简介：针对同济大学应用数学系主编的《高等数学》教材中存在着关于“对结论‘当x→0时，sinx→0’未加证明的情况下而应用”的问题，提出三种解决的方法：第一种方法是在讲授无穷小概念之前、极限定义应用时，证明limsinxx→0=0；第二种方法是在讲授无穷小比较之前、第一类重要极限证明之后，证明limsinxx→0=0；第三种方法是把“无穷小比较”这一节放到本章最后，即在讲完函数连续性后学习。实践证明第二种是简单而实用的好方法。

简介：EAP situations in which certain subjects are taught in English and EAP situations where subject courses are taught in the national language.,In EAP situations where subject courses are taught in the national language,EAP in ESL (English as a second language) situations

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简介：ECOLOGYReviewonForestHydrologyResearchZhengShaowei,LiYanqiong,MuChanglong(SichuanAcademyofForestry,Chengdu610081,P.R.China).WorldForestryResearch,2009,22(2):28-33.

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简介：XPS(X光检查光电子光谱学)分光计EscA-750被用来分析激活的碳，磁性的试剂和磁性的激活的碳的表面特性。他们的C原子价的分发和变化是坚定的。结论是磁性的试剂能化学上在激活的碳的表面上被吸附。在微观结构的磁性的试剂的吸附的机制的解释被讨论。

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简介：FORESTPROTECTIONEffectofHigh-VoltagePulseCurrentonVitalityandReproductionofPineWoodNematodeLiangJun~1,WangXiangfeng~1,WangZhenchao~2,NingShaohua~1,ZhangXingyao~1(1.KeyLab.ofForestEcologyProtectionofStateForestryAdministration,InstituteofForestEcology,EnvironmentandProtection,ChineseAcademyofForestry,Beijing100091,P.R.China;2.Collegeof

简介：AbstractIn vitro maturation (IVM) has been used in clinical settings for 30 years. The merits of IVM include that it needs a relatively small amount of hormones and short treatment period. However, because the effectiveness of IVM is lower than that of controlled ovarian hyperstimulation, there are few centers routinely use IVM, and it is only applicable to a few special populations. In this article, several oocyte sources related to IVM have been discussed and the effects of gonadotropin priming and triggering on IVM are described. Furthermore, we have reviewed the optimization of IVM culture conditions in recent years along with the effects of IVM on genes of oocytes and cumulus cells and the obstetric and neonatal outcomes. We aim to provide indications for future improvement of IVM technology so that the success rates of IVM technology in special populations can be improved. We hope that this mild and natural protocol can be applied to more populations, including individuals with normal ovulation.

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简介：BaosteelTechnicalResearch,aquarterlyjournal,whichisissueddomesticallyandabroad,isrunandsponsoredbyBaosteelGroupCorporation.BaosteelTechnicalResearchmainlyreportstheachievementsintechnologicalinnovation,academicresearch,newproductdevelopmentandindustrialequipmentimprovementbyBaosteel.Itwillcontinuetofollowuponhottopicsandservethecompany'stechnologicaldevelopmentand