几个杨树无性系干物质与鲜物质比值的研究

测定引种的15个外来杨树无性系和作为对照的本地响叶杨的干物质与鲜物质的比值,进行显著性测验,结果表明:16个参试品系的茎、枝、根及单株总和的干重/鲜重比值,在α=0.01的水平下,均差异显著;参试杨树无性系的根部干物质/鲜物质比和地上干物质/地下干物质比值为重复力相对较高的性状.     

THE INFLUENCE OF THE DRAWING TEMPERATURE ON PHYSICAL STRUCTURE AND PROPERTIES OF PET FILAMENTS

In this paper the influences of the drawing temperature on physical structures and properties of PET filaments have been studied. The results show that the temperatures of the first-stage drawing will have significant effects on birefringence development of filaments during the second stage drawing, as well as the oriented amorphous filaments change to crystanine-oriented filaments after heat treatment. Increasing temperature of the second-stage drawing can be greatly increasing the crystallinity and decreasing the dry heat shrinkage of the filaments.     

Fractal Characteristics of Dry Sliding Surfaces Based on 3-D Measurements

3-D surface morphology measurements of compact graphite irons were used to analyze the fractal characteristics of the surfaces to relate the dry sliding surface morphology to the fractal dimension. The measurements show that the fractal dimensions (Df) of the sliding surfaces vary from1 to 2 and are closely related to the surface morphologies. Increasing depths of grooves or pits increases the Df values, At the same time, increasing densities of the grooves also causes the Df values to increase. The data can be used to discuss relationship between Df and the friction coefficient as well as the wear rate.     

湘江长沙段枯水期水位变化及其影响研究

湘江是长沙的母亲河,长沙的发展得利于湘江的恩泽.但近几年来,湘江年年出现特枯水位,特别是2007年以来,长沙站最低水位逼近25.1米的供水警戒线.以湘江2010-2011年度枯水期长沙段水位变化为重点进行分析,并把多年来长沙站出现的最低水位与近几年出现的情况进行比较分析,得出近年来湘江长沙段枯水期的水位变化趋势.最后分析了湘江长沙段枯水期水位走低的各种影响.     

State of the art for dry tree semi technologies

Dry tree semi is a fast developing technology and becomes more and more appealing to the operators as a solution for producing deepwater reserves. Utilizing a dry tree semi means spending less cost on well mainte-nance and interventions,while the production platform can be integrated and commissioned at quayside. This paper presents a comprehensive overview of various technologies for dry tree semi,such as E-semi,T-semi,paired-column semi and long stroke tensioners. Each dry tree semi concept is briefed in terms of global performance,top tension riser (TTR) tensioner system,quayside integration and feasibility to environment.     

各类Ti基合金阳极用于电解MnO2（EMD）的研究

本文报道了各类Ti基合金阳极（纯Ti,Ti—C,Ti—B,Ti—Ni,Ti—Mn（Ⅰ）（涂层）,Ti—Mn（Ⅱ）（合金）〕用于电解MnO_2（EMD）的实验研究工作.经二周期的连续电解（一周期为30天）,电流密度i.d=100A/m~2),纯Ti阳极钝化严重,从中筛选出Ti—Mn阳极及Ti—Ni阳极为最佳。     

焦炉煤气脱硫技术的发展现状

在已有文献的基础上,对国内外现有的焦炉煤气脱硫技术现状进行了系统的总结,着重介绍了湿法脱硫技术,并进行了硫回收方法的比较。     

国产干酵母活化方法的研究

本试验利用土豆汁、活化液、土豆汁加活化液对丹宝利和梅山两种国产干酵母分别进行了活化，并测定其发酵力。结果表明，对于丹宝利活化最佳工艺为利用活化液活化４５ｍｉｎ，对于梅山活化最佳工艺为利用５％土豆汁和活化液共同活化１５～３０ｍｉｎ，两种干酵母发酵力分别提高９０ｍｌ和１２１ｍｌ，这为国产干酵母替代进口干酵母提供了依据。     

福建陆缘壳、幔异常结构与深部热储潜能分析

中国东南陆缘福建省境内地热资源丰富,近地表主要属于中、低温和中温水热存储。这种清洁的绿色资源如何有序规划与高效利用是福建地域可持续发展并在一定程度上替代部分化石能源所必须面对的重要课题。通过地球物理场和壳幔介质物理属性与结构环境分析和研究提出:(1)福建省大量的浅层水热资源在发展地方经济和民用中可形成一个中、低温及中温长期利用的网络平台;(2)探查福建陆缘地域地下是否存在热岩体乃能否有效替代部分化石能源的核心;(3)福建热田区地球物理边界场响应和壳幔介质属性与空间结构是探索与厘定地下热能能否稳定、安全、可靠和长期供给的基石;(4)漳州盆地深部可能存在干热岩的背景和边界条件。     

连续投加微生物絮凝剂促进厌氧污泥的颗粒化

将升流式厌氧污泥床(UASB)反应器在(35±1)℃下运行102天处理低浓度废水,研究微生物絮凝剂对厌氧污泥颗粒化的影响.结果表明:投加微生物絮凝剂或阳离子PAM(聚丙烯酰胺)对厌氧污泥颗粒化具有促进作用;连续投加微生物絮凝剂的反应器1(R1)运行43天后,容积负荷达3.8 g/(L.d)(以单位容积反应器每天的化学需氧量负荷计),而投加阳离子PAM的反应器2(R2)和对照反应器3(R3)达到同样的容积负荷分别需要44和98天;R1中的颗粒污泥在沉降性能和产甲烷活性方面优于R2中的颗粒污泥;实验结束时,R1,R2和R3的COD去除率分别为94.5%,91.7%和84.0%.