我国纺织行业上市公司资本结构实证研究

资本结构是企业筹资的核心问题之一,上市公司资本结构是否合理直接关系到其企业价值最大化的实现.以纺织行业上市公司公开数据为样本,运用回归分析方法,分析影响我国纺织行业资本结构的因素,认为:资本结构与企业获利能力、资产担保价值正相关,与企业规模负相关,与成长性、实际税率相关不明显.     

大气污染源监测采样技术

依据气态污染源共同的排放特性及平均排放浓度，排放速率的概念，导出气态污染源监测中常用的三种采样方法：积分法、分部积分法、有限加合近似法。根据分析化学的要求，提出样品采集时间的设计方法。由此得出不同类型排放源的监测时间和采样频率确定方法。     

Increased energy expenditure due to increased territorial defense in male lizards after phenotypic manipulation

Fitness tradeoffs are difficult to examine because many fitness variables are correlated and vary in the same direction. Phenotypic manipulation circumvents many of these difficulties, and here we used this technique to examine mechanisms for tradeoffs between increased aggression (territorial defense) and survivorship. The behavioral phenotype of male mountain spiny lizards (Sceloporus jarrovi) was manipulated with testosterone to increase territorial defense, a sexually selected trait. We previously demonstrated that increased territorial defense results in a decrease in survival caused by a lower ratio of energy intake to energy expenditure. Here we measured energy consumption of increased territorial aggression using the doubly labeled water technique in the field and compared males with and without testosterone implants (Fig. 1). In a supplementary study we measured standard metabolic rate using captive lizards given similar testosterone implants to examine if an increase in energy expenditure was a result of only an increase in standard metabolic rate (Fig. 3). Our results indicated that a primary contribution to tradeoffs between increased territorial defense and survivorship could be made by a 31% increase in energy expenditure in the field that is not due to an increase in standard metabolic rate.     

浙江天台山茶树光合日变化及光响应

自然条件下使用LCA－4型便携式光合测定系统研究了栽培天天台山主峰华顶山的茶树连体叶片的光合日变化及光响应。结果表明：在初夏晴天,上年越冬叶片（下称二年生叶）的光合速率,表观量子效率,羧化效率和饱和光强比展叶红16d的一年生叶高,CO2补偿点和光补偿点比一年生叶低,两者的净光合速率日进程曲线均为“双峰”型,午间胞间CO2浓度上升表明,此时净光合速率下降主要受非气孔限制因素的影响。一年生叶蒸腾速率高于二年生叶,它们日进程曲线为单峰河,午间最高,而气孔阻力进间最低。不同时段作光响应和CO2响应试验表明,上午茶树的表观量子效率,饱和光强和羧化效率较高,光补偿点和CO2补偿点较低。图3表4参26     

土壤水分对沙棘成活率及抗逆生理特性的影响

为提高沙棘在滩涂区，半干旱区造林的成活率，对不同土壤水分下沙棘的生理学特性进行了分析。结果表明：（1）在不同土壤水分处理下，随土壤含水量降低及处理时间的延长，沙棘叶片脯氨酸（Pro)含量升高，POD活性增强，可溶性糖含量升高；水淹情况下，沙棘叶片Pro含量明显上升，POD活性增强，可溶性糖含量升高。（2）土壤含水量在15%-30%之间，沙棘苗木成活率最高（100%），生长最好；35%和40%处理下，沙棘苗木成活率较高（66.7%)，生长良好；5%，10%处理水平和水淹情况下，沙棘苗木成活率低（33.3%)，生长不良，（3）不同处理下，随土壤含水量的降低，沙棘叶片的相对电导度增大，沙棘受伤害的程度加剧，且淹水对沙棘的伤害最重。     

A Preliminary Study of Geographic Influence on Arsenic Concentrations in Human Hair

Past mining activities in the county of Cornwall in the United Kingdom, has exposed the local environment to raised levels of As. Previous research has shown an increased concentration of As in crops grown in such areas and the subsequent take-up of As through the food chain may lead to an increased body burden in man. In an attempt to evaluate this, a pilot study was carried out using Particle Induced X-ray Emission to compare the hair As concentration of a group of Cornish residents to that of a control group consisting of residents in the counties of Oxfordshire and Wiltshire. The null hypothesis being that there is no significant difference between the hair As concentrations of the two groups.Each group comprised thirty six age and sex matched subjects. The mean hair As concentration for the Cornish group was 2.51 g g-1, which is significantly greater than that of 0.7 g g-1 found in the control group (p = 0.004). The World Health Organisation suggests a hair As value greater than 1 g g-1 as evidence of increased exposure to As and 5 g g-1 is quoted by the Canadian Government as evidence of significant ingestion of As. Twenty one Cornish subjects registered a value at or above 1 g As g-1 compared to nine in the control group (p = 0.0003). Five subjects in the Cornish group had values that exceed 5 g As g-1, compared to only two in the control group (p = 0.23). We use the results of this study as evidence to support our continued work in this area in order to evaluate possible health implications.     

柠檬醛对赤子爱胜蚓(Eisenia fetida)再生的影响

用不同浓度柠檬醛处理不同部位剪切的蚯蚓,和处理剪切后不同时间段的蚯蚓体段,探讨了柠檬醛对赤子爱胜蚓再生作用的体段、作用浓度和敏感时间段.结果表明,柠檬醛对蚯蚓再生有明显影响,但这种作用依不同体段而异,以体段P7和P25作用最显著,而A25,A90和P60的受柠檬醛影响较小; 柠檬醛影响蚯蚓头部再生,而不影响尾部再生;对再生有影响的柠檬醛浓度为1mmolkg-1, 0. 1mmolkg-1和0. 01mmolkg-1 (土壤),对蚯蚓再生作用的时间为切后0. 5~1d.试验显示,柠檬醛干扰蚯蚓再生头部形成而且还影响再生头尾体轴形成;内源视黄酸在蚯蚓头尾轴再生图式形成中有重要作用. 图4表4参18     

用黑麦幼苗法测定土壤中污染元素的生物有效性

本文对全国污灌区１２个土样中Ｃｄ形态与生物有效性的试验表明，Ｃｄ的交换态，吸附态，有机结合态均有效，且有机结合态最为有效，对紫阳县富硒土壤的试验表明：黑麦幼苗中的总Ｓｅ量与０．１ｍｏｌ／１ＫＨ２ＰＯ４的浸提量最为相关，从而推荐该法为酸性土壤有效Ｓｅ的浸提方法，对西安污水厂污水污泥在娄土上不同施用量的试验表明：幼苗中Ｎ，Ｐ随施用量增加而增加，Ｎ，Ｐ的有效率分别为５０－７０％及１５－２８％；黑麦幼苗中     

铁聚合反应速率研究

研究了聚合硫酸铁絮凝剂制备中亚铁的氧化反应速率，证明该速率对Ｆｅ＾２＋为零级，对ＮＯ２（ｇ）为一级，因此提高气相中ＮＯ２的分压可大大缩短制备时间。     

水中氨氮挥发影响因素探讨

本文介绍了水中氨氮挥发的影响因素。水中氨氮挥发速率常数随水的ｐＨ值和水温升高而增加，水面风速大则常数值也大，大气压高的地区的挥发速率常数小于大气压低者。与蒸馏水体系相比，在实验条件相同时滇胡水中氨氮挥发速率常数小。