On the ethics of biological control of insect pests

Of the four types of biological control, (1) natural, (2) conservation, (3) augmentation, and (4) importation), ethical concerns have been raised almost exclusively about only one type: importation. These concerns rest largely on fears of extinction of animal species. Importation biological control is a cost-effective alternative to chemical control for basic food crops of resource-poor farmers. Regarding the other types of biological control, natural biological control is not consciously manipulated by humans. Augmentation has some technical concerns, but is generally an environmentally-sound, viable alternative to chemicals and offers local employment. Conservation can help empower farmers to preserve native species, while saving labor and money and reducing chemical insecticides.     

茶蚜生物学及综合防治研究进展

茶蚜是我国茶树的主要害虫之一。本文概述了茶蚜的主要生物学、生态学以及综合防治技术方面的进展,主要包括茶蚜的形态特征、发生规律、茶蚜对寄主的选择以及综合防治等,并对今后的工作重点进行了展望。     

应用域管理提高企业内网管理水平

针对企业信息内网存在的安全隐患进行分析,提出应用域管理提高内网的集中管控能力,列举企业应用域管理的优势,重点提出网络访问保护（NAP）和网络准入控制功能,结合本企业说明实施域管理过程的步骤及注意事项。     

智能复合控制在电液伺服系统中的应用

讨论了模糊逻辑和神经网络控制器在电液伺服位置系统中的应用,据此,提出一种智能复合控制方法,仿真和实验表明,这种控制器对系统参数变化不灵敏,且能有效地改善系统的动态特性。     

烟田烟蚜的药剂防治研究

1988～1991年,用8种杀虫剂在大田和室内进行了防治烟蚜的试验.结果表明,30%乙酰甲胺磷(600ppm),2.5%溴氰菊酯(12.5ppm),50%甲胺磷(1000 ppm)和50%抗蚜威(166.7ppm),田间防治效果均达90%～100%,其残效期为6～10d.雨天防治效果,则乙酰甲胺磷和甲胺磷明显优于其它药剂.但甲胺磷为剧毒农药,一般应禁止在烟地使用,必要时至多在烟苗移栽初期使用1次.25%杀虫双(1250ppm)、5%氯氰菊酯(33.3ppm)和20%杀灭菊酯(100ppm)的平均防治效果均低于70%,故应尽量避免使用.各种农药在烟田对烟叶产生药害的最小浓度(ppm)为甲胺磷7374.8,乙酰甲胺磷6000.0,杀虫双3962.0,溴氰菊酯66.9,氯氰菊酯267.5,杀灭菊酯802.6.     

浅论德育测评的管理

德育测评作为一种管理活动，包括计划、组织、领导、控制等过程，应针对不同的过程，采用相应的管理方法     

A HIERARCHICAL CONTROL METHOD FOR REACTIVE POWER OPTIMIZATION IN LARGE-SCALED INTERCONNECTED POWER SYSTEMS

This paper presents a new hierarchical and coordinative control method for reactive power optimization in large-scale interconnected power systems. It combines the interconnection forecast method for hierarchical control in large-scale steady state industrial systems with the incremental linear programming method for reactive power optimization in real time. The results of applying the method to power system examples show that the method not only solves the problem of high dimension in order, but also keeps the advantages of the incremental linear programming method. The proposed method is also suitable for the security analysis of reactive power correction in large-scale interconnected power systems.     

桑蚕血液型脓病的鉴别与防治技术

桑蚕血液型脓病是对桑蚕生产危害最严重的一种疾病,此病的传染力、耐药性、致病力都特强。传染途径除食下传染和创伤传染之外,也可与很多种类昆虫交叉感染发病。对该病要以防为主,做到养前、养中、养后彻底消毒,杜绝病原。在幼虫期可采用蚕用脓病灵预防,取药10 mL兑水1 000 mL稀释后,均匀喷洒在10 kg桑叶上,叶表稍干无水迹后喂蚕。4龄起蚕1次,5龄起蚕后隔日1次;采用含有效氯0.3%～0.5%的漂白粉澄清液、1%的新鲜石灰澄清液、消特灵1代主剂125 g,加水5 kg,浸渍桑叶或喷洒桑叶进行消毒,叶表稍干无水迹后喂蚕,可有效的预防该病的发生。