简介：本文介绍国产化多管膜式磺化技术的开发、应用以及提高和完善，并对国内磺化技术的发展前景进行了展望。

简介：<正>(a1/2)2和（a2）1/2兄妹俩,一来到花果山就受到众猴儿的青睐,争相和他俩交朋友,哪知有的小猴对他俩不礼貌,有时还受到了委屈,于是他俩就到猴王那里去告状,兄妹俩来到猴王面前,深深行了个鞠躬礼说:“报告猴王,小猴儿常把我俩张冠李戴,用我俩来解题时,

简介：二次根式(a~2)~(1|2)和((a~2)~(1|2))有什么区别吗?主要表现在下面三个方面:1．读法不同．(a~2)~(1|2)读作根号a的平方,而((a~2)~(1|2))读作括号根号a括号的平方．2．表示的意义不同．(a~2)~(1|2)是求a~2。的算术平方根．((a~2)~(1|2))求的是a的算术平方根的平方．一个表示求一

简介：privatizations have significantly increased market liquidity. And also privatization takes a potential role global capital market development. A. The Rise of Capital Market-Based Finance Capital market-based finance has in fact been increasing in importance,and the total capitalization of the US market increased almost nine-fold (from $ 1.9 trillion to $ 16.6 trillion) over the same period.c. The Dramatic Growth in Securities Issuance Volume Since 1990 Another way of measuring the rise of capital markets is to examine whether their share of annual corporate financing activity has grown relative to that of other sources of funding. Security offerings by US issuers accounted for two-thirds of the global total throughout 1990-1999,before more than doubling to $ 1.22 trillion in 1999--rivaling the US total. The global value of M%26A activity in 1999 reached $ 3.4 trillion

简介：以往研究发现话语标记语so主要有因果连贯功能,然而,在日常会话中它还有其他重要语用功能。文章以英语中的so为对象,并以互动式会话语料为例,多维度探讨它在语境条件下的语用功能,比如行动驱使标记功能、含义推断标记功能及情态标记功能,同时通过研究so的语用功能启示英语教学：作为英语教师在课堂教学中要强化对话语标记语的语言输入与情景渗透,培养学生的语用交际意识与提高学生的语用能力。

简介：privatizations have significantly increased market liquidity. And also privatization takes a potential role global capital market development. A. The Rise of Capital Market-Based Finance Capital market-based finance has in fact been increasing in importance,and the total capitalization of the US market increased almost nine-fold (from $ 1.9 trillion to $ 16.6 trillion) over the same period.c. The Dramatic Growth in Securities Issuance Volume Since 1990 Another way of measuring the rise of capital markets is to examine whether their share of annual corporate financing activity has grown relative to that of other sources of funding. Security offerings by US issuers accounted for two-thirds of the global total throughout 1990-1999,and especially so since 1997. This is venture capital investment by US venture capital partnerships. The fund-raising patterns of these private equity investors are discussed in Gompers and Lerner (1998)

简介：我们知道：（a＋b）2=a2＋b2＋2ab；a2＋b2=a2＋b2；（a—b）2=a2＋b2-2ab三者显然是不等的。但是观察知道，三者之中都有a2＋b2，不同之处在于一个比一个多2ab，即：

简介：凡是涉及到有关两个数之和、差与积的问题时，可考虑a2＋b2=（a＋b）2＋2ab及其推出公式（a＋b）2=（a±b）2＋4ab．它们在解题中常常能获得出奇制胜的效果，可看以下几例．

简介：一、从一个真实的故事说起笔者是一位年逾古稀的老者．早在半个多世纪以前的1961年10月8日，在扬州工学院内燃机制造专业04乙班《高等数学》课堂上，青春年少的我正在聚精会神地听老师讲课．老师举了一个例题，并霍然把它写在黑板上（那时我们是把“tan”写作“tg”）：

简介：Twonewdicyanamidecoordinationpolymers,{Mn(dmpz)[N(CN)2]2}2(1)and{Cu(dmpz)[N(CN)2]2}2(2)(dmpz=3,5-dimethylpyrazole),weresynthesizedandcharacterizedbysinglecrystalX-raydiffractionanalysisandIRspectroscopy.In1and2themetalionshavetwodifferentcoordinationmodes,whereoneiscoordinatedtofourdicyanamideanionsandtwomonodentatedmpzmoleculestoformaslightlydistortedoctahedralgeometry,whiletheotheradoptsoctahedralgeometry,surroundedbyfournitrileNatomsandtwoamideNatomsofthedicyanamideanions.Bothcomplexescontaintwoalternatingchainsthatareparalleltoeachother.

简介：　　Xiao和Zhang提出了用正热电离质谱法测稳定氯同位素的方法,并在1995年得到进一步完善.现在该方法已在卤水、气溶胶、岩石、亏损带钻孔水以及含氯的脂肪族碳氢化合物的氯同位素研究中得到广泛应用.Xiao和Zhang证明了低含量SO42-和其他离子不会干扰质谱测定,但是大量的F-,SO42-和一些有机将会抑制离子的发射.为了获得高精度的氯同位素测量结果,溶液中的SO42-、NO3-和其他可能的阴离子都要被除去.基于形成AgCl沉淀除去Cl-方法以纯化样品是有效的,但是由于过程的复杂性和可能引入高的空白氯而受到限制.……

简介：privatizations have significantly increased market liquidity. And also privatization takes a potential role global capital market development. A. The Rise of Capital Market-Based Finance Capital market-based finance has in fact been increasing in importance,and the total capitalization of the US market increased almost nine-fold (from $ 1.9 trillion to $ 16.6 trillion) over the same period.c. The Dramatic Growth in Securities Issuance Volume Since 1990 Another way of measuring the rise of capital markets is to examine whether their share of annual corporate financing activity has grown relative to that of other sources of funding. Security offerings by US issuers accounted for two-thirds of the global total throughout 1990-1999,before more than doubling to $ 1.22 trillion in 1999--rivaling the US total. The global value of M%26A activity in 1999 reached $ 3.4 trillion

简介：本文用离子色谱法同时测定了饮用水中的三种阴离子，选择最佳工作参数，提高分析的精密度，准确度。三种离子测定线性范围广，相关系数r>0.9990,相对标准偏差小于0．5％，回收率在98％－102％之间。

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简介：Hypersubstitutions是印射操作符号到相应arities的术语的地图砰。他们作为使ahyperidentity和归纳的概念精确到M-hyperidentities的一个方法被介绍。每身份作为亢奋的身份在满足的一个变化被称为固体。如果每身份是为子集Mof的M-hyperidentity所有亢奋的替换的集合，变化被称为M固体。在亢奋的替换的单音的标志和一种给定的类型的代数学的所有变化的格子的潜水艇格子之间有一个Galois连接。因此，知道怎么有趣、有用半组或在到M固体变化的相应格子的性质的这个Galois连接下面的亢奋的替换转移的单音的标志性质ofmonoids。在这篇论文，我们学习类型(2,2)的eachhypersubsfitution的顺序，即，周期的subsemigroup的顺序由类型的所有亢奋的替换的单音的标志的thathypersubstitution产生了(2，2)。主要结果是顺序是1，2，3，4或无限。

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简介：在本期的“课例大家评”中,我们刊登了同一课题下的6篇课例供大家点评.2001年第4期,我刊登出了“直线方程的一般形式(第一课时)”课例的征稿启事.截止4月30日,我们收到课例来稿百余篇.这6篇课例就是从这些应征稿件中遴选出来的.为了便于大家点评,我们将6篇课例按学生学习状况的优、中、差分为三组,每组有2篇课例.在撰写点评稿时,您可以对6篇课例进行总评,也可以就学生学习状况相当的两篇课例进行评析,还可以对某一课例做单独的评议.总之,点评的内容应相对集中,以便于编者对稿件进行选择和组构.文稿字数以1000字左右为宜,截稿日期为9月10日.投稿时请在信封左下方注明“课例大家评”字样.欢迎广大数学教师和教研工作者积极参与本次“课例大家评”活动,我们将以较大篇幅集中发表观点新颖、论述深刻、对教学具有较强启发性的优秀来稿.在此,我们还特别对提供“直线方程的一般形式”课例的所有老师表示衷心的感谢.

简介：ThesplittingofpotentialenergylevelsforgroundstateX2ΠgofOx2(x=+1,1)underspin–orbitcoupling(SOC)hasbeencalculatedbyusingthespin–orbit(SO)multi-configurationquasi-degenerateperturbationtheory(SO-MCQDPT).TheirMurrell–Sorbie(M–S)potentialfunctionsaregained,andthenthespectroscopicconstantsforelectronicstates2Π1/2and2Π3/2arederivedfromtheM–Sfunction.TheverticalexcitationenergiesforOx2(x=+1,1)areν[O+12(2Π3/2→X2Π1/2)]=195.652cm1,andν[O12(2Π1/2→X2Π3/2)]=182.568cm1,respectively.Allthespectroscopicdataforelectronicstates2Π1/2and2Π3/2aregivenforthefirsttime.

简介：<正>我们通常通过"数形结合"的方法判断过定点的直线与双曲线x2/a2-y2/b2=1能否相切,强调对图形的感知能力。本文拟用严格的代数方法说明定点与双曲线的位置关系对切线条数及切点位置的影响。

简介：ThecrystalstructureofDi-nitratobis（ethylcaprolactam）uranyl（Ⅱ）UO2[CH2（CH2）4CONC2H5]2（NO3）2wasestablishedbyasingle-crystalX-raydiffractionstudy.Itistriclinie,spacegroupP1,witha=7.171（2）,b=8.655（3）,c=10.182（5）A,α=78.27（3）,β=70.63（3）,γ=81.76（3）°,V=581.7（4）A3,Z=l,Dc=1.94g.cm-3.FinalRvalueis0.0218.Theresultrevealsthaturanylioniscoordinatedtosixoxygenatoms,twoofthemarefromtwocarbonylgroupsofethylcaprolactamandtheotherfourarefromtwonitrategroups.