北斗导航系统在新疆安全生产过程中的应用研究

针对新疆通信盲区多、移动信号覆盖差，安全事故信息不能及时上报，应急救援指挥严重滞后的现状，提出了建设针对长途客货营运车辆、危险品运输车辆、应急运输车辆、野外工程车的基于我国自主建设、独立运行的北斗卫星导航系统的安全生产运输车辆监控管理系统，提供面向各行业需重点监控各型车辆及其主管调度部门的基于位置的综合信息服务。从而实现生产事故应急救援指挥，有序开展野外事故设备、人员的搜寻，有效提高安全生产信息化水平。     

Effects of Culture Area,Stocking Density,and Shrimp and Fish Polyculture on the Cost Efficiency of Hard Clam,Meretrix meretrix,Culture: A Case Study of Hard Clam Farms in Yunlin,Taiwan

Using the hard clam farms in Yunlin, Taiwan as examples, this study analyzes the effects of culture area, stocking density, and shrimp and fish polyculture on the cost efficiency (CE) of hard clam farming. A data envelopment analysis (DEA) is used to estimate the farms' technical efficiency (TE), allocative efficiency (AE), and CE values. The findings show that the mean TE, AE, and CE values of hard clam farms are 0.74, 0.57, and 0.43, respectively. The TE value is higher than the AE value, which indicates that cost inefficiency is mainly attributable to poor AE. Tobit regression results suggest that there are positive relationships between CE and both culture area and operator experience. Hard clam stocking density and age of the operators have negative effects on CE. Hard clam culture areas larger than 2 ha and a stocking density of 1.1–1.2 million hard clams per hectare have higher CEs than smaller culture areas and smaller or larger stocking densities. The use of sand shrimp, white shrimp, kuruma shrimp, and grass shrimp for polyculture and the use of milkfish and silver sea bream for polyculture are both associated with high CEs.     

Effect of Hybrid Abalone,Haliotis discus hannai × Haliotis discus discus,Cultivation on the Carbon Cycle: Carbon Source/Sink

Respiration, calcification, and bio‐deposition of hybrid abalone, Haliotis discus hannai × Haliotis discus discus, fed on different foodstuffs have been measured to evaluate the effect of hybrid abalone culture on carbon source/sink in coastal areas. Fed with Laminaria japonica, Undaria pinnatifida, Gracilaria lemaneiformis, U. pinnatifida, and Ulva pertusa, alternated mutually, the carbon bio‐deposition rate of hybrid abalone was 24.29 ± 6.39, 65.40 ± 10.55, 21.48 ± 5.99, and 29.28 ± 6.47 µg/g/h, respectively. Hybrid abalone fed on U. pinnatifida had a higher carbon bio‐deposition rate compared to that fed on other foodstuff (P < 5%). Rate of CO₂ released by respiration of hybrid abalone fed on the experimental foodstuff was 24.53 ± 8.57, 32.73 ± 7.99, 29.31 ± 6.39, and 33.67 ± 12.37 µg/g/h, respectively. Results indicated that calcification presented less relationship with body weight type of the foodstuff. The rate of CO₂ released by calcification into seawater and atmosphere was 2.77 ± 1.89 and 6.53 ± 3.36 µg/g/h, respectively. The total rate of CO₂ released because of bio‐deposition, respiration, and calcification processes was 16.19 ± 4.67 µg/g/h, while the total rate of carbon sequestered in shells and tissues was 8.94 ± 2.07 µg/g/h. The study revealed that hybrid abalone culture is a source of CO₂.     

援非大型拖拉机柴油机故障处理及修复措施

本文对中国援助的埃塞俄比亚中国-埃塞俄比亚农业示范中心的鲁中804大型拖拉机的柴油机不能运转故障，在没有相关零配件置换的情况下，采取了拆卸检查，采取更换润滑油、清除各缸套锈斑、精修拉缸伤痕，清除活塞各进、排气门积炭或污垢等措施修复故障部件，经过正确安装与调试成功修复此柴油机的操作过程进行技术总结，并对如何避免相应故障提出了建议。     

香梓楠轻基质育苗试验

香梓楠为热带南亚热带珍贵优良用材树种,使用轻基质网袋育苗,具有重量轻、通气透水性好和方便种植等特点,可以提高造林成活率和降低造林成本。选择树皮和锯末为基质原料,经晒干、粉碎、过筛、堆沤后,按一定比例把拌匀的基质灌装至网袋内制成育苗容器。香梓楠种子经催芽后移植至容器内,注意淋水,保持湿润;每半个月施肥一次,以氮肥和复合肥为主,宜勤施薄施:当苗高约15 cm时,移疏苗木,并适时进行空气修根,促进侧根的生长;约11月中旬以后可实施炼苗,当苗龄达12个月,苗高达45cm以上时,苗木可出圃造林。     

家蚕一代杂交种出库方法和催青技术的实践与启示

<正>蚕种催青是将经过越冬解除滞育或经人工孵化法处理后的蚕卵(已经活化的)保护在合理的环境条件下,使胚子顺利地向着生产所需要的方向发育直     

车用柴油机动态排放的试验设计

目前,国内主要采用稳态试验反复测试和结合实际经验进行推断的方法对车用柴油机动态排放性能进行评估,不仅费用高、效率低,而且还具有一定的盲目性和局限性.为此,根据柴油机动态工况的特点,搭建了动态排放试验台架,采用正交设计的方法进行了试验方案设计,按照相关国标对某国产车用柴油机进行动态排放性能试验,并试验结果进行了分析和处理,为对车用柴油机动态排放性能进行正确的评估提供的参考.     

中山市资源节约型农业发展模式

本文以广东省中山市农业的发展为案例,定性分析了该地区发展节约型农业的模式,以及由此带来的经济效益、生态效益和社会效益。在对中山市农业进行科学评价的基础上,确定了该市节约型农业的主要发展模式为：节地模式的土地流转和提高耕地质量,节水模式的微灌,节肥模式的测土配方。     

结合实际工作谈建筑信息模型（BIM）的意义及推广

论述了建筑信息模型（BIM）的概念,并结合实际工作说明了建筑信息模型（BIM）技术对建筑师、工程师日常工作的意义,提出了推广BIM的一些建议。