森林防火隔离带技术的变革与优势

以消减可燃物的方式预防和阻隔森林火灾是林火管理工作的核心。传统阻隔技术向遮荫型防隔火技术的演变已成为近10余年西方多林国家林火管理工作的重要走向。从林火的特点和蔓延基本规律出发, 遮荫型防火隔离带技术通过局部消减可燃物载量和规则化可燃物分布, 显著降低其可能形成的林火强度, 使大多数火灾自行熄灭。该项技术的实施不受区域和气候条件限制; 与传统全光式防火隔离带和生物防火林带相比, 不但工作量较小, 对林分植被和生态环境的干扰也较小。该项技术实现了偶发性林火的防控、森林健康及生态维护的有机结合, 以此替代传统防火隔离带技术效益显著。针对遮荫型防隔火技术的进一步研究工作应包括不同稀化程度林带潜在火行为和其防隔火效能的量化评估、林地局部可燃物稀化的高效作业机具以及伴随该项技术实施产生的大量生物质副产品的有效利用问题。     

Character of Coalbed Methane Enrichment Controlled by Hydrological Geology in Libi Gorge Anticlines

The drain character and hydraulic linking are studied by analyzing the property of water-bearing and water-resisting, groundwater flowing and hydrochemistry character in Libi Gorge anticline. According this, the character of methane enrichment controlled by hydrological geology in the region is researched. It is indicated that Libi Gorge belongs to block anticline gas pool sealed by water pressure. In shallow layers, the water-bearing layers are controlled obviously by atmospheric water. The groundwater flows actively, drains nearby, but has no influence on the coalbed methane; in middle layers, the coal-bearing layers contain water weakly and the water flows slowly. The water has a roof and bottom enclosed effect on gas in water network ; in deep layers, the layers contain water weakly. The groundwater stops running and has a bottom enclosed effect on gas in water network. The most of faults are pressure faults, upper of them is water guiding, lower of them resisting. They enclose the gas by pressure. In addition, it is important for thickening rock character to enclose the gas.     

Research on Cooperative Design Network Security Based on IP-VPN

As the important method and instrument of agile manufacture,the technology of distributed collaborative design and manufacturing has become the hotspot of manufacturing. The basic concept and key technologies of IP_VPN are introduced in this paper,and a collaborative design network model based on IP_VPN is presented. Distributed collaborative design is a multi_user,multitask involved system, which is consisted of lots of collaborative processs,so the network security is the key of distributed collaborative design. We research on the security of collaborative design network based on IP_VPN, hence get a conclusion:we can construct an economical?practical and secure collaborative design network system by the application of data encryption,user authentication and access control based on the role,etc.     

Nonlinear Science and Control about the Geological Hazards in the Three Gorges Reservoir Area

Such the geological hazards as landslide, rockfall, debris-flow and so on frequently occur in the Three Gorges Reservoir Area, so it is a very practical and immediate job to explore the mechanism caused the geological hazards and how to forecast and control the geological hazards. For this reason, this paper introduces the situation of the geological hazards occurred in the Three Gorges Reservoir Area and the major type and feature of the geological hazards occurred in Chongqing, and discusses the basic principle about the modern nonlinear science applied to the geological hazards and the creep-slip, stick-slip occurred on the joints of rock mass and the monitoring technology of the geological hazards.The basic thinking is put forward which can be applied the modern nonlinear science to the geological hazards occurred in the Three Gorges Reservoir Area.     

Numerical Simulation Research on Stabilityof Dissolving Cavityfor the Low-depth-thin-layer Rock Salt

In order to extend life of salt well, avoid sinking and use the formed cavity reasonably, the factors of effecton cavity stability must be researched during the process of water mining of rock salt, so that the effective prevention measures can be put. The stability of dissolving cavity for the low depth thin layer rock salt has been researched by the ADINA non linear finite element method.The results show that the stability of dissolving cavity obviously becomes strengthened with the decrease of its height, and has a decreasing trendas with the span increase of the cavity . The effect of incidence on stability of the cavity is very little. The stability of cylindroid cavity is higher than that of converse taper cavity. The assorted model is a kind of transition shape. The influencing order of cavity stability is the ffollows, height>geometrical shape>span>incidence.     

Study on Nitrosification of Ammoniated Wastewater

In this paper, taking the hydraulic mechanism of auto unloading truck as an example, the author discussed mainly how to analyze the movement of mechanism by the optimization method.     

哈尔滨农民回迁居住区户外景观设计模式初探

回迁居住区是城市化推进的产物之一。回迁居民在这里的生活模式和物质环境都与其本来状态存在许多矛盾与冲突,使得回迁者常出现“回而不适”现象,对农民生活、心理产生极大负面影响。文章以哈尔滨市城郊失地失宅农民为研究对象,通过对哈尔滨市现有回迁居住区进行实地调研,总结出农民回迁者审美的特异性和行为活动需求及农民回迁居住区户外空间环境存在的主要问题,最后提出满足于哈尔滨失地失宅农民审美情趣及行为需求的农民回迁居住区户外空间设计策略,让农民回迁者有一定的家园感与归属感。     

不同氮素浓度处理对彩椒生长及几项生理指标的影响

通过研究不同浓度的氮素水平处理对无土基质培彩椒生长及几项生理指标的影响,以确定甜椒的最佳氮素施用浓度,为今后的甜椒生产的合理施用氮素提供科学的参考依据.结果表明:氮素含量极大影响了彩椒植株的生长和产量,氮素施用水平为5～15 μmol/L范围内,适量增施氮肥有利于增产,彩椒的最佳氮素施用浓度为15 μmol/L.当氮素施用量过低(2.5 μmol/L)和过高(20μmol/L)时对彩椒植株的生长不利.     

南板蓝病虫种类调查及综合防治

2003～2004年对贵州地道中药材南板蓝病虫害种类进行了调查.结果表明,南板蓝常见病虫有9种（病害5种,虫害4种）,均为贵州南板蓝病虫害的新记录.根据对病虫系统研究,提出了贵州南板蓝GAP基地病虫害综合防治技术措施.