悦来航电枢纽库坝区渗漏问题的分析与评价

根据松花江悦来航电枢纽工程的勘察实例,对悦来航电枢纽库坝区渗漏问题进行了分析与评价,并且较详细地介绍了工程防治处理措施。     

高层建筑消防给水系统的安全研究

我国的城市化进程如此之快,使高层建筑因此林立。高层建筑的不断出现给消防工作带来了新的问题,所以在高层消防安全设计的过程中要综合多种因素控制火灾发生率,以及发生火灾之后通过消防措施可以将损失降到最低。因此,不仅在设计时要严谨、科学、实用,严格按照《消防规范》设计,更要在施工过程中对消防器材的选择、消防设施的生产加工,及消防通道的维护管理方面下功夫,以此来保障高层建筑在使用过程中的安全性。     

浅谈内蒙古大兴安岭林区一期天保工程实施效果

文章对内蒙古大兴安岭林区一期天保工程实施效果进行了分析、评价,剖析了其存在的主要问题,并对今后经营提出了相应的建议。     

基于新型城镇化背景的耕地利用与保护研究

建国以来，中国城镇化发展经历了六个阶段，呈现出波状起伏、落后于世界水平、依靠政府推动、区域不平衡等特点。城镇化进程中土地利用存在“寅吃卯粮”、农村土地收益流向城镇、土地资源过度开发、耕地健康水平下降、土地政策基本取向难以实现等问题。新型城镇化背景下耕地保护必须有新思维：降低土地消耗强度，提高土地利用效益；建立与农业适度规模经营相适应的农地流转新机制；实施耕地健康养护工程，保障安全食品供给；制定涉地指标省域内跨市有偿调剂和“地随人走”的政策。     

黑龙江赫哲村民俗旅游开发研究

黑龙江赫哲村具备深厚的民俗积淀,是我国北方渔猎文化的精神枢纽,鲜明的文化特征吸引了众多游客。介绍了赫哲族的传统文化及旅游业发展现状,分析了赫哲族基于旅游业的文化及价值变迁,顺势探讨了几种民俗旅游开发发展模式,力图基于民俗文化与旅游发展的辩证关系,服务于以赫哲村为代表的文化传承与旅游经济的共同发展。     

鸭疫里默氏杆菌贵州流行株蜂胶灭活疫苗制备

【目的】制备鸭疫里默氏杆菌(Riemerella anatipestifer,RA)贵州流行株蜂胶灭活疫苗。【方法】选取RA血清2型贵州流行株(RA-SS-8株)为基础菌株,依次利用分光光度法和平板计数法测定细菌生长曲线,再进行灭活条件筛选,以蜂胶为佐剂制备RA贵州流行株蜂胶灭活疫苗,并进行无菌检验、安全性检验及免疫鸭攻毒保护性试验。【结果】分光光度法测定RA-SS-8株菌液D_{600 nm}值随培养时间变化显示,细菌在0~3 h时增殖缓慢,在3~10 h时增殖趋势明显加快,在10 h以后增殖逐渐趋于平缓,随着培养时间的延长,细菌最终进入衰亡期;平板计数法结果显示,RA-SS-8株D_{600 nm}值为0.1~0.8时,该菌处于对数生长期,且D_{600 nm}值与活菌数呈现良好的线性关系;RA-SS-8株最佳灭活条件为0.2%甲醛溶液、37 ℃灭活12 h;蜂胶灭活疫苗含菌量为3.8×10⁹ CFU/mL,蜂胶干物质含量为10 mg/mL;无菌检验巧克力琼脂培养基上未见菌落生长;安全性检验以2倍免疫剂量接种雏鸭在观察期内未表现出不良反应,大体病变观察未见明显病变;免疫鸭攻毒保护性试验显示,蜂胶灭活疫苗免疫组鸭对RA-SS-8株的攻击后保护率为70%,蜂胶灭活疫苗对试验鸭心脏、肝脏组织均具有良好的保护效果。【结论】本研究成功制备了RA贵州流行株蜂胶灭活疫苗,为蜂胶灭活疫苗制备和动物免疫试验奠定基础。     

东深供水改造工程计算机监控子系统的结构分析

东改工程建设专用管道输送原水，各泵站之间“刚性”联接，这对监控系统的可靠性提出了十分严格的要求：目前，国内外还没有能够提供借鉴经验的同类工程。建立在OTN通信平台上的东改工程的计算机监控子系统具有的技术特点，较好地满足了工程对可靠性的要求；分析监控子系统的结构和配置。     

我国柴油轿车的发展现状及展望

随着汽车工业的不断发展，轿车动力柴油化已成为行业发展的必然。总结了我国柴油轿车的发展现状，指出了柴油轿车的优势，论述了制约柴油轿车发展的因素，提出了促进柴油轿车未来发展的几点建议。     

Exploring Harmonious Protection of Land Resources in City Construction

Urbanization in China is at an essential point in its transformation from the initial stage to accelerating stage. With quick expansion of city scale and large occupation of land for urban construction, the contradiction between land resource shortage and people's living needs becomes more and more prominent. It has great affection on the grand plan of China's sustainable development of economy and society. How to adjust the relations between the development of urban construction and protect the land resource, promote the rational use of urban land, perfect and complete the protection system of land resource for improving the efficiency of urban land use. In order to conserve land resource and find a sustainable way for development of people's living and environment construction, the above mentioned problems are the most important issue for urban construction and important subject of this paper.     

Field evaluation of insect-resistant transgenic Populus nigra trees

The performance of insect-resistant transgenic poplar trees (Populusnigra) expressing a Cry1Ac gene from Bacillus thuringiensis subsp. Kurstaki HD-1 against poplar defoliators was evaluated in the field at the Manas Forest Station in Xinjiang Uygur Autonomous Region during1994–1997. The results showed that the average percentage of highly damaged leaves on the transgenic trees was 10% while that on the control trees in nearby plantations reached 80–90%. The average number of pupae per m² of soil at 20cm depth in transgenic poplar plantation was 18 which was only 20% of that found in the non-transgenic control field. The number of pupae and the leaf-damage on transgenic trees described above are all far below the threshold set for chemical protection measures. The non-transformed poplar trees grown in the same plantation with the transgenic trees were also protected indicating that cross protection occurred between these two kinds of trees. Insect-resistant transgenic poplar trees have a potential application value in afforestation. This revised version was published online in August 2006 with corrections to the Cover Date.