COMPARISON OF APMP PULP CHARACTERISTICS OF JUVENILE TRIPLOID CHINESE WHITE POPLAR IN SALINE SOIL WITH THAT OF NORMAL 5-YEAR POPLAR

INDRODUCTIONAs we all known, the characteristics of Chinese papermaking and pulping industry are small scale, low-grade products and serious pollution in that the shortage of fiber supply. The effective method for developing Chinese papermaking is integrated forest-paper production by developing fast-growing plantation wood.Common characteristics for the pulps from various wood species of the Populus family are low long fiber yield, high bulk and relatively low strength values. On the ot…     

SOME PROPERTIES OF BOUNDED SETS IN INDUCTIVE LIMITS

Let (E,ξ）=indlim (En,ξn） be an inductive limit of a sequence of locally convex spaces,For brevity,denote by (DS) each set Bbounded in (E,ξ） is contained in some En； and (DST) each set B bounded in (E,ξ） is contained and bounded in some (En,ξn）. Theovem 1.(DS) holds provided that (i) for each n∈N,there is a neighborhood Un of o in (En,ξn） and m(n)∈ such that -↑Un^E包含于Em(n),and (ii) for any neighborhood V n of o in (En,ξn）,∞↑Un=1 Vn absorbs every bounded set in (E,ξ）. theorem 2 Let all (En,ξn） be metrizable and (DS) hold,then for each bounded set B IN (E,ξ）and each n ∈N thcrc is a neighborhood U k of o in (Ek,ξk）, 1≤k≤n ,and m(n)∈N such that ——↑(B U1 U2 … Un)^E包含于 Em(n). theorem 3. Let all (En,ξn） be Frechet spaces.Then (DST) holds if and only if (i) for each n ∈N,there is u neighborhood U n of in (En,ξn） and m(n)∈N such that 0↑Un^E包含于Em(n),and (ii) for each each closed ,absosed,absolutely conuex,bounded set B in (E,ξ）,∞↑Un=1(（εnB)∩Un）absorbs B,where U n is any neighborhood of o in (En,ξn） and εn is any positive number for every n ∈N。     

CHARACTERISTICS OF LIGNIN REACTIONS IN SODA COOKING OF WHEAT STRAW PART 1 REACTION OF UNCONDENSED LIGNIN

INTRODUCTIONWheatstrawisanimportantfiberrawmaterialinmanycountries熏particularlyinAsia熏EasternEurope熏andLatinAmerica熏whereareshortofwoodsuppliessuitableforthepurpose.Ithasbeenreportedthatnon-woodplantfiberswillplayanincreasingroleintheglobalpulpandpaperindustry熏andtheworldstrawproductionwasapproximately10熏000milliontonsin1998眼1演.ThelargestcapacityforproducingpulpfromthestrawisconcentratedinChina.IntheEuropeanCommunitythereisalsoagrowinginterestinthedevelopmentofnon-foodapplicati…     

SOME STUDIES OF STRUCTURAL CONTROL IN HIGHRISE BUILDINGS: A REVIEW

本文总结了我们工作组在高层建筑结构控制方面的工作，一些工作是实验研究，一些是基于实验的理论分析。本文还指出了结构控制的一些有前景的研究方向。     

CHANGES IN PHYSICO-CHEMICAL CHARACTERISTICS AND STRUCTURES OF WHEAT STRAW SODA LIGNIN AFTER MODIFICATION

麦草碱木素在碱催化下经脱甲基改性可提高其反应活性．本文采用元素分析、扫描电镜、凝胶色谱、１ＨＮＭＲ和１３ＣＮＭＲ波谱较系统地研究脱甲基改性麦草碱木素化学组成、微观表面形态和化学结构的变化．研究结果表明，脱甲基活化改性后，麦草碱木素的甲氧基含量由１０．３％降至６．０９％，而酚羟基和羧基含量分别由２．９８％和４．５８％增至５．５１％和７．１０％．脱甲基改性后氧元素含量下降，改性麦草碱木素的微观形态呈致密的球形，在尺寸上比未改性的麦草碱木素小．改性后麦草碱木素的平均相对分子质量（Ｍｗ）由６２１７降至５１４８，相对分子质量分布情况发生变化．脱甲基改性使苯环上的烷基芳基醚键断开，形成酚羟基，同时，在一定程度上也伴随木素结构单元间化学联接的断裂，体现在其核磁共振波谱和平均相对分子质量的变化．     

A STUDY ON FLORISTIC FEATURE AND DIVERSITY OF DEHANG REGION SEED PLANTS IN HUNAN

1IntroductionDehangisascenicspotlocatedatthesouthofWulingMTsintheCentralChil1a,between2815'and2843'N,lo93o'andlO945lE,risingfroml89.4mto964.6mabovesealevel,withanareaof225km.Thisre-gionhasacomplicatedtopography.Itissituatedinsubtropicmonsoonclimateareaandrichinlimestone.Ev-ergreebroad-leavedforest,Bambooforestandlowsimountainevergreenconiferousforestaremainvegeta-tionshere'Moreover,Miaonationalitypeoplehhvebeenlivinghereforalongtimeanditenjoysgreatnation-a1navour.Thenoraisrichandthevegeta…     

SOME INVESTIGATIONS ON THE NATURE OF REACTION PROCEEDING OF RADIATIONINDUCED GRAFTING IN THE POLYETHYLENE AND ACRYLIC ACID SYSTEM

Direct radiation grafting of acrylic acid (AA) and methacrylic acid (MAA) onto polyethylene (PE) films was studied. The investigation of the nature and characters of grafting proceeding was performed. The penetration of grafting onto the thin PE film was studied and the mechanism discussed. This involves an initial stage whereby the grafted surface layer deforms the PE allowing further monomer to penetrate. It was shown that the surface grafting was dynamic controlled and the penetration of monomer depended on the polarity of monomer.