水分胁迫对生态恢复重要树种木荷与白楸幼苗的影响

采用盆栽控水试验，研究了水分胁迫下我国亚热带地区森林演替过程中的重要树种木荷（Schima superba）和白楸（Mallotus paniculatus）的幼苗叶片叶绿素、类胡萝卜素、SOD活性、POD活性、脯氨酸和MDA含量的变化．结果表明：在干旱胁迫下，白楸叶片SOD活性、POD活性、脯氨酸和MDA含量在22％土壤相对含水量下均出现剧增，而Chla、Chlb和Car含量在22％的土壤相对含水量下则均出现降低；在同样的干旱胁迫下，木荷叶片SOD活性、POD活性和脯氨酸含量在19％的土壤相对含水量下才出现增加，而Chla、Chlb和Car含量则变化不大．在轻度淹水胁迫下，白楸叶片SOD活性、POD活性、脯氨酸和MDA含量基本呈增加趋势，而Chla、Chlb和Car含量星降低趋势；木荷叶片SOD活性、POD活性和脯氨酸含量在同期规律不明显．相关分析表明，白楸叶片SOD活性同脯氨酸含量变化呈显著正相关（r=0．815，P〈0．05）和MDA含量的变化呈极显著正相关（r=0．932，P〈0．01）．由此说明，水分胁迫下，白楸比木荷敏感，木荷的耐受力强于白楸．     

正己烷在ZnNi/HZSM-5上芳构化反应的研究

研究了HZSM-5负载型芳构化催化剂中的硅铝比，锌、镍金属质量分数等对正己烷芳构化反应的影响．结果表明：催化剂的硅铝比越大，其稳定性越好，但芳构化能力弱，造成芳烃和BTX收率低；催化剂镍质量分数为1．0％，锌质量分数达到3．0％时，芳烃和BTX收率最高，分别为31．45%6和30．24％，再增大锌的质量分数芳烃和BTX产率保持不变；锌质量分数为3．0％，镍质量分数高于1．0％的情况下芳烃和BTX收率反而下降．因而催化剂中锌、镍的最佳质量分数分别为3．0％和1．0％．此外，还对催化剂的酸性变化对正己烷芳构化的过程进行了初步探讨．     

中国铁合金的市场概况与预测

目前中国铁合金生产能力达到800万t，其中锰、硅、铬等三大品种的生产能力及占铁合金生产能力的比重分别为：锰系铁合金320万t，占40％；硅系铁合金260万t，占32．5％；铬系铁合金110万t，占13．7％。     

热带雨林中的濒危植物——思茅木姜子

思茅木姜子是樟科家族中的一个小成员，分布在我国云南南部西双版纳的热带雨林里，是当地的特有树种。樟科植物多为高大的乔木，但作为研究其系统演化重要器官的花却非常小，寻找和采集样本都很困难。由于思茅木姜子在系统演化上具有较为特殊的假伞形花序（即3～5个伞形花序生于短枝上呈总状花序排列），因此它是解决和认识木姜子属群系统发育极为重要的材料；同时，作为热带雨林演替后期的树种，思茅木姜子在维持森林生态系统平衡中起着重要作用。不仅如此，思茅木姜子木材细致、美观，是良好的家具和建筑用材；种子含油和月桂酸，可提取芳香油，具有较大的经济价值。     

8种植物挥发性物质的抑菌杀菌作用

研究我校校内常见8种绿化植物叶片的挥发性有机物对大肠杆菌、金黄色葡萄球菌、枯草杆菌及酵母菌的抑制作用，对其抑菌效果的差异进行分析．结果显示：樟树、罗汉松、夹竹桃、大叶黄杨、法国冬青、石楠、龙柏、雪松等8种植物叶片释放的挥发性有机物对枯草杆菌、酵母菌的抑菌率均在47％以上，抑菌效果显著；对大肠杆菌的抑菌率有13．5％以上，其中樟树、罗汉松、雪松的抑菌率在30％以上；对金黄色萄萄球菌的抑菌率在22％以上．8种植物对空气中的微生物作用效果明显，杀菌率均在20％以上．从环境生态学的角度来看，选择抑菌、杀菌作用强的树种作为高校的绿化树种，有利于绿色高校建设．     

薄层扫描法测定蒙药特木仁-5中栀子甙含量

利用薄层扫描法测定特木仁-5中栀子甙的含量．本方法直接点样，快速、简便、灵敏度高，重复性好，回归方程为y=344．12X-4．0914；含量为0．741，平均回收率为98．4％，RSD为0.602％。     

马占相思木材酸碱性质与抽提物含量及其相关性

对10年生马占相思木材酸碱性质和抽提物含量进行了测定和相关分析，结果表明：马占相思木材平均pH为5．34，呈酸性，其酸缓冲容量和碱缓冲容量分别为0．142mmol和0．053mmol，两者的比值为2．68，其冷水、热水、1％NaOH和苯-醇的抽提物含量平均值分别为4．84％，5．75％，15．98％和6．09％；心材的酸缓冲容量和冷水、热水、1％NaOH及苯-醇的抽提物含量明显高于边材，并随着树干高度的增加而减小；而pH和碱缓冲容量则低于边材，并随着树干高度的增加而增大；pH与酸缓冲容量及热水、1％NaOH和苯-醇的抽提物含量呈负相关，而与碱缓冲容量和冷水抽提物含量呈正相关。     

ICP-AES法同时测定铝合金熔炼炉渣中的硅和铁含量

用高温熔融法处理铝合金熔炼炉渣，ICP-AES法同时测定其中的硅和铁含量。选定铁259，940nm，硅251．611nm铁和硅的检出限分别为：60ng／ml和10ng／ml，该方法的相对标准偏差小于2％，回收率为98．0～102．0％。该方法用于实际样品的分析，测定结果与国际规定方法的结果吻合。     

高效液相色谱法测定熟肉制品中苯甲酸、山梨酸

用液相色谱法测定熟肉制品中苯甲酸、山梨酸含量的分析方法，针对样品具有高脂肪、高蛋白的特点，可以改进相应国家标准中样品前处理方法。达到蛋白质沉淀完全、溶液易过滤，对苯甲酸、山梨酸的测定准确可靠的目的。试验结果表明，方法的相对标准偏差分别为：3.0％和3．9％；方法的添加回收率分别为：86．0-87．5％和85．0-96．7％；方法的最小检出量分别为：1．0ng和0．5ng。     

香桂炼油试验

香桂,又称岩桂,俗名三股筋,樟科樟属树种,是我县特有的乡土经济林树种,主要分布于我县古楼、巡司、乐义、镇舟等岩溶区域,其枝、叶、干、皮均可提取芳香油,尤以叶子含油率最高达3．15-4．36％,香桂的主要成份为香樟油素,含量达96．01—99．60（中国科学院成都分院生物研究所分析测定）,是目前世界上发现的唯一枝叶富含黄樟油素的树种。以黄樟油为主要原料制成的洋茉莉醛,广泛应用于日用化工和医药业上,     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the