冀东冬麦区雀麦的田间识别 发生规律及其化学防除技术的初步研究

通过田间观察对冀东冬麦区雀麦的形态特征进行了系统完整的描述,修正和完善了文献记载的不足,重点突出了直观性,使农民能够在麦田里容易地识别出雀麦。通过定期田间调查,明确了雀麦在冀东冬麦区的发生规律：在冀东冬麦区雀麦属越年生杂草,绝大部分在秋季出苗,占发生总量的97%以上;雀麦分蘖力强,单株平均分蘖达10.6个。同时进行了啶磺草胺7.5%WG 3个剂量处理（135、180、360 g/hm2）对雀麦的田间防除药效试验,结果表明：啶磺草胺7.5%WG是目前防除麦田雀麦的理想除草剂,春季在雀麦7叶期前用啶磺草胺7.5%WG 135～180 g/hm2＋专用助剂225 mL/hm2,对雀麦鲜重防效达97%以上,对混发的荠菜和播娘蒿也有较好的兼治效果,并且对小麦安全。     

卷柏启动培养研究

以卷柏（Selaginella tamariscina）幼叶、茎尖及茎段为外植体,研究了不同消毒方式的消毒效果以及基本培养基类型和激素组合对初代培养的影响。结果表明：以卷柏的茎尖为外植体,用5 g.L-1多菌灵处理8 h的消毒方式,取得了较好的消毒效果,无菌率可达79.8%;茎尖最佳初代培养基为MS＋KT 2 mg.L-1＋NAA0.2 mg.L-1＋IAA 0.1 mg.L-1。     

局部应用IL-12对小鼠S180实体瘤的抗瘤效应及机制初探

目的研究白细胞介素-12（Interleukin 12,IL-12）对小鼠S180实体瘤的抗肿瘤作用并初步探讨其机制.方法将小鼠左后肢皮下接种S180细胞荷瘤后的BaLB/c小鼠随机分为生理盐水组和IL-12组,分别给予生理盐水和IL-12.接种第28天,眼球取血,流式细胞仪分析外周血T细胞亚群的变化;解剖取瘤称重,计...     

Surface discharge characteristics and gas generation law inoil-paper insulation of transformer

Based on a surface discharge model, partial discharge experiment in the simulation transformer tank is carried out to research the development characteristics and characteristic parameters’ variation law of surface discharge in transformer oil-paper insulation, and the variation characteristic of dissolved gases in oil in the discharge process is emphatically researched. The results show that the surface discharge value increases at the beginning stage of the discharge process, and reaches its maximum after 2~3 h, then it decreases gradually. As the development of partial discharge, the absolute generation speed of CO fluctuates around a certain value with small variation. While, the absolute generation speeds of H2 and CH4 increase first and then decrease, and the variation of discharge spectrum is highly similar to the variation of oil-dissolved gas’ absolute generation speed.     

Heat Transfer Performance of Capillary Mats Using Wet Construction in Winter

For the capillary mats using wet construction, a winter experiment designed to investigate the heat transfer performance was described, and the heat transfer performance analysis which contains the comparisons between different pipe space and different thickness of cement mortar surface was carried out. As a result, compared with that of the traditional radiant heating pipes, the capillary mats of wet construction require supply water with lower temperature, and it shows good heat transfer performance and system energy efficiency as well. According to the demand of indoor heat dissipation and human comfort as well as the coupling relationship between the temperature of supply water and surface construction thickness, it is suggested that the proper construction method should be comprehensively considered in practical applications.     

我国茶叶标准现状 问题及对策

茶叶标准对于促进茶叶生产、规范茶叶市场、保护消费者权益、扩大茶叶出口等都具有重要意义。本文通过对国内茶叶标准现状的研究,探讨了我国茶叶标准建设存在的问题及对策。     

一种新入侵棉花害虫——眩灯蛾生物学特性研究

研究了近两年发现的一种新入侵棉田的重要荒漠植被害虫--眩灯蛾[Lacydes spectabilisc(Tauscher)]的生物学特性.介绍了卵、幼虫、蛹、成虫的形态特征.其寄主较为广泛,1年发生1代.4月中、下旬出蛰危害,5月中旬老熟幼虫开始越夏,7月下旬开始化蛹,8月下旬成虫羽化并产卵,9月中旬幼虫孵化.提出了该虫的监测与防治方法.     

Heuristic research and fuzzy evaluation for-post-faultrestoration in distribution networks

A heuristic research and fuzzy evaluation fault restoration algorithm for distribution network is proposed to quickly restore power supply for the regions where power supply is interrupted. The algorithm searches power supply paths by finding effective tie-switches and sectionalizing switches, and eliminates improper switch pair according to power flow calculation. During service restoration process, the problem is divided into self-healing restoration, whole-region restoration, sub-region restoration, load-transfer restoration and load shedding restoration. The algorithm takes switch operation times and customer priority into account, and consequently, obtains initial feasible schemes. Fuzzy technique is used to evaluate the schemes from minimal switch operation times, load transfer, feeder margin and maximal voltage drop. Weighted sum of four indices provides a good guideline for choosing the optimal scheme for restoration operation. Calculation results of a certain distribution network show that this algorithm is feasible.     

Using 3D finite element method to simulate in-situ stress field and itsdistribution characteristics in Tianfu Sanhui NO.1 mine

Tianfu Sanhui No.1 mine of Chongqing is located in the convergent extreme of Huayingshan scopulate fold belt, which is an area of in-situ stresses concentration. Coal and gas outburst occurred not only frequently, but also high-intensity, and the working seams are all outburst seams, so the research of its three-dimensional initial in-situ stresses field can put forward the suggestion on the production design of coal mine and the prediction of coal and gas outbursts. Based on the geological materials about Sanhui No.1 mine, this paper developes the 3D FEM model, and uses the elastoplastic finite element method and ANSYS program in numerical simulation of the initial in-situ stresses field. Based on the simulation results, it analyzes the characters of the in-situ stresses of Sanhui No.1 mine and K1 coal seam.