THE WAYS FOR IMPROVING INDOOR ENVIRONMENT AND AIR-CONDITIONING SYSTEMS IN DANCLING HALLS

Since 1988, air temperature, humidity, air quality, noise level and intensity of illumination in lots of dancing halls in China have been investigated and tested. This paper introduces the present situation of indoor environment and air conditioning systems in dancing halls of China. The design indexes of cooling load for room and ontside air are recommended. The reasons for indoor environment deterioration have been found out. From the actual situation of China, the ways for imoroving indoor environment and approach of energy conservation in air conditioning systems are explored.     

玉米种子培养皿法发芽试验误差分析

培养皿法是玉米种子发芽试验常采用快捷方便的方法,但此方法的发芽率比较低、变异系数较大,不能反映种子本来固有的发芽水平。对此,笔者进行了培养皿法发芽试验的研究,结果表明,在培养皿内种胚向下是造成发芽率低和变异系数大的原因,若将种胚全部向上置放,就能减少发芽率的误差,体现出玉米种子的正常发芽水平。     

Effects of remifentanil on monophasic action potential and transmural dispersion of repolarization in rabbit myocardium

AIM: To study the effect of remifentanil on monophasic action potential and transmural dispersion of repolarization (TDR) in the 3-layer myocardium of isolated rabbit hearts. METHODS: Adult rabbits (n=18, 2.0 ~ 2.5 kg) were used to isolate the hearts for preparing Langendorff perfusion model. The hearts were randomly divided into 3 groups after perfusion with K-H solution for 15 min: the perfusion in control group (C group) continued for 60 min; the hearts in remifentanil group (R group) were perfused with 12 μg/L remifentanil K-H solution for 60 min; the hearts in remifentanil+aminophylline group (RA group) were given 60-min perfusion of 12 μg/L K-H remifentanil+30 mg/L aminophylline. The HR and 3 layers of myocardial monophasic action potential (MAP) in the left ventricular anterior wall were recorded at time points after balanced infusion for 15 min (T₀), and continued perfusion for 15 min (T₁), 30 min (T₂) and 60 min (T₃). The monophasic action potential duration of repolarization at 90% (MAPD₉₀) and the transmural dispersion of repolarization (TDR) were calculated. The early afterdepolarization, delay afterdepolarization and arrhythmia were also observed. RESULTS: In R group, slower HR and prolonger MAPD₉₀ and TDR at T₁~T₃ were observed as compared with those at T₀ (P<0.05). R group showed slower HR and longer MAPD₉₀ and TDR than C group and RA group (P<0.05). CONCLUSION: Remifentanil slows the HR, extends the MAPD₉₀ and increases the TDR, thus being prone to induce reentry. Aminophylline makes HR faster and MAPD₉₀ shorter, thereby reducing the TDR.     

银中杨人工林抚育采伐技术研究

采用标准地调查方法,对初植密度为2 m×2m的银中杨人工林的抚育采伐开始期和采伐强度进行调查研究,确定抚育采伐开始期为8年生时,采伐强度为50%。研究确定了银中杨人工林的经营密度表,以期为生产经营提供依据。     

EZH2-mediated regulation of NF-κB target gene expression in gastric cancer

AIM: To explore the mechanism by which over-expression of enhancer of zeste homolog 2 (EZH2) in a panel of gastric cancer cell lines is involved in tumorigenesis of gastric cancer. METHODS: Real-time PCR and Western blot were employed to examine the mRNA and protein levels of EZH2, respectively. MTS assay, cell migration and soft agar assay were performed to investigate the role of EZH2 in the regulation of stomach cancer behaviors. The effect of EZH2 on NF-κB target gene expression was determined by Luciferase reporter and real-time PCR. Co-immunoprecipitation was used to analyze the interaction of EZH2 and p65 in HEK293T cells. RESULTS: The expression levels of EZH2 were significantly increased in the gastric cancer cells compared with normal gastric epithelial cells. Pharmacological inhibition by DZNep or knockdown of EZH2 significantly compromised AGS and SNU-16 cell activity, cell migration and anchorage-independent cell growth. Moreover, siRNA knockdown of EZH2 impaired NF-κB downstream targets, such as IL-8, CXCL5 and CCL20. In addition, the interaction of EZH2 and p65 was detected. CONCLUSION: EZH2 mediates the growth of gastric cancer cells through the regulation of NF-κB downstream gene expression.     

哈密设施桃红蜘蛛的危害与防治

新疆哈密地区特有的环境条件为红蜘蛛的发生创造了强有力的生态环境,经多年的栽种经验,归纳总结了红蜘蛛的发生规律、造成的危害以及综合防治方法,有效的防治红蜘蛛的发生。     

黄河三角洲台田间渗水池塘的水质变动规律分析

以黄河三角洲地区台田间渗水池塘为研究对象,分析了渗水池塘的水质因子变动规律。结果表明:不同池塘间水质因子差异较大,但均表现出水体盐度较高、氮磷等营养物质含量较低、K+离子含量相对较低、Ca2+离子和Na+离子含量相对较高及K+/Na+显著低于正常海水等特点。结果说明,黄河三角洲地区台田间渗水池塘的水质条件不适合直接进行水产养殖,应对水质调整后才可做养殖之用。     

3-RPS并联机构奇异位形及工作空间研究

提出一种求解并联机构无奇异位形工作空间的方法。通过分析3-RPS并联机构在奇异位形时动平台的微分运动与结构约束及关节约束的关系，得到机构奇异位形判别方程和奇异位形曲面方程。探索了工作空间边界，综合分析了机构奇异位形与工作空间的关系。合理选择机构结构参数和关节变化范围，得到了无奇异位形的工作空间。     

突发性环境污染事故应急监测的速度保障

针对突发性环境事故如何保证应急监测速度的问题，从应急监测前准备工作及应急监测运行期两方面进行说明，为保障应急监测速度提供了切实可行的方法和步骤。     

THE OPTIMAL DECISTON OF ECONOMICAL DEVELOPMENT BY MARKOVIAN DECISION PROGRAMMING

This paper studies the tactics choice and its improvement in the development of economy by means of Markovian Decision Programming. An optimal decision and the maximum expected revenue can be obtained. The . paper also presents the procedures and formulas of numerical evaluation.