以人为本,营造最佳人居环境--居住区绿化建设与管理浅析

居住区绿化是城市园林绿化系统的重要组成部分，是伴随现代化城市建设而产生的一种新型绿地，它最贴近生活、贴近居民，也是最能体现“以人为本”的现代理念。文章在指出存在问题的同时，提出了以人为本，营造最佳人居环境的多项措施，并指出需要处理好的几个关系。     

糖醇类物质对人肝细胞低温保存的影响

将传统肝细胞冻存保护剂配方中的DMSO的浓度减为5%,并添加不同浓度的D-山梨醇、木糖醇或麦芽糖醇,置于-80℃的冰箱冻存两周,两周后将细胞快速复温,进行细胞存活率、24h贴壁率以及细胞形态学的检测,并与10%浓度DMSO组对照比较。结果表明,D-山梨醇、木糖醇、麦芽糖醇均对人肝细胞的低温保存有一定的保护作用,其中5%DMSO+0.4M D-山梨醇组复温后细胞的存活率、贴壁率均优于其他冻存液组,D-山梨醇与DMSO联合使用降低了冻存保护剂DMSO的浓度,表明两者有协同作用。     

高效液相色谱法测定大鼠全血中的灵芝酸单体Me

建立大鼠全血中灵芝酸单体Me的高效液相色谱测定方法。采用色谱柱Diamonsil~(?)C_(18)柱(250mm×4.6μm,5μm),流动相为甲醇-水(体积比为94:6,用醋酸调pH至3.6);流速为1mL/min;检测波长为245nm;内标为苯丙酸诺龙。灵芝酸单体Me血中浓度在0.05～40μg/mL范围内线性良好(r>0.99),定量限为50ng/mL,日内和日间测定的精密度(以相对标准偏差表示)均低于8.6%。该方法简便、灵敏、准确,适用于大鼠体内灵芝酸的药物动力学研究。     

Study of surface activation of PET by low energy (keV) Ni and N ion implantation

Polyethyleneterephthalate (PET) has been modified by 100 keV Ni⁺ and N⁺ ions using metal ion from volatile compound (MIVOC) ion source to fluence ranging from 1 × 10¹⁴ to 1 × 10¹⁶ ions/cm². The increasing application of polymeric material in technological and scientific field has motivated the use of surface treatment to modify the physical and chemical properties of polymer surfaces. When a material is exposed to ionization radiation, it suffers damage leading to surface activation depending on the type. The surface morphology was observed by atomic force microscopy (AFM). That show the roughness increases with fluence in both the cases. The Ni particles as precipitation in PET were observed by cross-section transmission electron microscopy (XTEM). The optical band gap (E_g) deduced from absorption spectra; was calculated by Tau’c relation. Raman spectroscopy shows quantitatively the chemical nature at the damage caused by the Ni⁺ and N⁺ bombardment. The ration of I_D/I_G shows graphite-like structure is formed on the surface. A layer of hydrogenated amorphous carbon is formed on the surface, which has confirmed by XPS results also.     

( Ti| Me) ( C,N) / Ni 的润湿性及其价电子结构

运用座滴法研究了( Ti , Me) (C , N) / Ni 体系的润湿性;运用经验电子理论( EET 理论) 计算了多元陶瓷相的价电子结构(VES) , 建立了陶瓷相化学成分与价电子结构的关系, 并建立了价电子结构与接触角的回归关系式。结果表明, 提高温度、延长保温时间均使体系接触角减小; 碳化物的添加使体系接触角进一步减小,碳化物改善润湿性能力的大小依次为: Mo₂C > TaC > WC > VC > NbC。不同碳化物的添加均能导致最强键上共价电子数n_A 增加, 其中添加VC 的影响最为明显, 依次为VC > Mo₂C > NbC > WC > TaC。      

纳米SiO2改性尼龙力学性能的研究

研究了纳米SiO2改性尼龙(PA)的力学性能。结果表明：随纳米SiO2用量的增加，尼龙的拉伸强度、弯曲强度、弯曲模量及热变形温度等均有所提高；断裂伸长率降低一定程度后趋于稳定。     

studyaimed toprovide theoretical basis fo

HR on the PPOofpotatowas significant,followed byascorbic acid,citric acid and sodium chloride,but that of sodium chloride was unsignificant.The optimum dosages of 3 factors for inhibiting PPO of potato were as follows: 0.019% 4-HR,0.57 % citric acid and 0.027 % ascorbic acid,while the sodiumchloride level had little effect on the PPO of potato.[Conclusion] 4-HR had significant inhibitingeffects on the PPOofpotatoand the inter     

Roger, me, and my attitude: Film propaganda and cynicism toward corporate leadership.

Two studies of US and Japanese respondents assessed attitudes resulting from viewing the film Roger & Me (M. Moore, 1989). In Exp 1, the responses of 162 adults who had seen the film in the US were contrasted with 106 people about to view the film. Those who saw the film exhibited more cynical (negative) attitudes toward General Motors in particular and toward US business in general. Exp 2 employed a Solomon 4-group design in Tokyo, Japan, to assess the generalizability of the US results and also to assess attitude change from pretest to posttest. Consistent with the US results, viewing the film had negative effects on Japanese attitudes toward General Motors and toward US business in general. Furthermore, attitudes toward Japanese business became slightly more positive as a function of viewing the film. Implications and future research needs are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

热改性膨润土对甲基橙废水的吸附

研究了热改性膨润土对甲基橙的吸附性能。结果表明改性的方法能够明显地改善膨润土在水中的沉降性与过滤性,大大地提高了膨润土对甲基橙的吸附能力。在pH等于7及常温条件下,当经300℃煅烧2h的热改性膨润土的用量为12g／L时,对浓度为248mg／L的甲基橙的吸附量和去除率分别为22．12mg／g、98．58％;对浓度为41．0mg／L的甲基橙的去除率达97．4％。     

Thermal precipitation or gelling behaviour of dissolved methylcellulose (MC) derivatives—Behaviour in water and influence on the extrusion of ceramic pastes. Part 1: Fundamentals of MC-derivatives

Methylcelluloses dissolved in water show a temperature dependent gelling behaviour. The gel temperatures depend mainly on the degree of substitution with methyl groups. The behaviour of methylcellulose containing pastes is of high importance in various applications. The paper describes the influence of the degree of substitution on the thermal characteristics of methylcelluloses in water and in ceramic pastes. The gelation temperature of the methylcellulose in both systems is increasing with decreasing degree of substitution. This enables a broader temperature window in the ceramic extrusion process. Extrusion near the gelation temperature normally leads to many defects in the extrudate. However, close to the gelation temperature the extruded profiles show more defects with methylcelluloses having a higher degree of substitution. Methylcelluloses having a low degree of substitution also enable a paste extrusion above the gelation temperature (up to 90 °C). This is not possible with currently commercially available methylcelluloses.