共查询到20条相似文献,搜索用时 15 毫秒
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According to the charactor of the tonw-system layout in moun-tainous area,this paper analyses current situations and existing problems ontown-system in Leshan region,combining with the practice of the town-system planning in this region.This paper also studies how to make the town-system in the region rational layout in the light of the economic andsocial development tendency in the end of the 20th century and the beginningof the 21st century. 相似文献
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通过不同食物引诱剂与害虫诱捕器结合对不同虫种储粮害虫进行诱捕,试验表明水平距离5m、粮食深度2m左右诱捕检测害虫效果明显,对主要储粮害虫有良好的诱捕效果;摆放位置对于诱捕器的诱捕效果影响大;采用控氧储存技术进行生态储粮,经分析,米象、米象抗性品系、谷蠹、谷蠹抗性品系及赤拟谷盗对除氧剂毒力LD99.9分别为8.60g/kg、11.01g/kg、9.14g/kg、8.16g/kg、4.18g/kg,其中赤拟谷盗最敏感,米象抗性品系需要脱氧剂最多;试验粮堆投放除氧剂量为0.50g/kg、1.0g/kg、1.5g/kg、2.0g/kg、2.5g/kg、3.0g/kg,脱氧剂在用量为2.5g/kg、3.0g/kg对谷蠹、谷蠹抗性品系、米象、米象抗性品系、赤拟谷盗及用量1.5g/kg、2.0g/kg对赤拟谷盗杀灭效果在90%以上;脱氧剂在用量为2.0g/kg时对谷蠹抗性品系、米象、米象抗性品系杀灭效果在85%以上;经实仓应用除氧剂用量为2.5g/kg、3.3g/kg、2.5g/kg并抽真空、3.3g/kg并抽真空能保证稻谷储存1年基本无活虫,可保证稻谷储存安全;经应用除氧宝0.5g/kg、1.0g/kg、1.5g/kg、2.0g/kg、2.5g/kg、3.0g/kg、3.3g/kg对稻谷发芽无显著影响。 相似文献
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上海地区气候温和湿润,储粮中较易发生虫害,粮食品质下降较快。通过开展充氮气调储粮相关研究课题,研究充氮气调储粮技术在上海地区推广应用的可行性。结果表明,充氮气调储粮对保持粮食品质、防治储粮虫害孳生、降低仓储劳动强度、提高粮食食品安全等具有积极的作用,适合在上海地区推广和应用。 相似文献
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Luo Shushan 《保鲜与加工》1994,(2)
Looking back on the urban planning of the reeervior area of three sorges alonsthe Yangtze River and integrating with the development of the theory of urban planning and the reqirements of building the reservior area ,ten principles of planning and reconstruction are put for-warded . 相似文献
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In this paper,the structure of assembly foundation oferosion protection,its design and construction procedure are studied.Itis the development of double wall steel open caisson and reinforcedconcrete open caisson.Based on the data collected in tests,some difficultproblems about the principle of expanding foundation erosion prote-ction in deep water and construction methods are resolved.Comparedwith other foundations,the assembly foundation narated in this papercan decrease the time limit and construction cost of a project.Themethod may de better for solving the problem of bridge foundation indeep water. 相似文献
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装粮高度8m的超高大平房仓(简称"8m仓",下同)是北京地区近几年投入使用的新型仓储设施,相对于此前投入使用的装粮高度6 m的高大平房仓(简称"6 m仓",下同),具有仓房跨度大、粮堆高、通风系统双侧分布等特点。2012年和2013年,通过检测环流熏蒸期间粮堆内PH_3气体浓度,对照和分析其变化及规律,结果表明:8m仓在应用环流熏蒸技术过程中,在熏蒸气体均匀快速分布、维持熏蒸气体浓度均匀稳定方面比6m仓具有更好、更可靠的适宜性。同时,还制定了以磷化氢环流熏蒸技术为保障的储粮害虫应急处理方案,实施并完善了以磷化氢环流熏蒸技术和惰性粉防护技术为核心的储粮害虫综合防治技术。 相似文献
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对平房仓储藏的早籼稻谷采用移动式环流装置结合横向通风系统进行膜下横向环流熏蒸,探究平房仓环流熏蒸在横向通风系统中的技术特点、操作工艺和应用效果。试验表明,利用横向通风系统可使PH3气体在结束环流施药后3h内,达到最低与最高浓度比0.6的要求,可以在粮堆内快速而均匀地形成有效浓度,大幅减轻劳动强度,增强熏蒸效果和应急情况的处理。 相似文献
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Yang Juan Du Yuqun Zhang Qichao 《保鲜与加工》1991,(1):80-83
The surface quatities of fine iron oxide particles are studied. The pore distribution and surface a area are determined and calculated. The results show that the surface area is 290m/g, 830m/g and the middle-pore(20~50A )is the main part of the fine iron oxide particles prepared by the colloid chemical method. 相似文献
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分析了粮食储藏的环境要求,提出了冰蓄冷空调技术、地源热泵技术、太阳能制冷技术、蒸发冷却技术等在粮仓中应用的可行性,并结合相关系统图或原理图,在省电、节能的背景下,指出了粮食储藏技术今后的发展方向。 相似文献
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Cao Shugang 《保鲜与加工》1992,(3):128-133
Defferent forms of mechanical construction, the distribution of stress, and the process of the deformation destruction in the enclosing rocks in a working face of a pitching seam are analyzed according to its geological and mining specialities. 相似文献
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LARGE DEFLECTION OF A CIRCULAR PLATE ON PASTERNAK FOUNDATION UNDER A CONCENTRATED LOAD AT THE CENTER
Liu Dong Liu Longquan 《保鲜与加工》1992,(4)
Based on Karman's nonlinear foundamental differential equations, the new method combines perturbation method with integral equation method is forward to solve nonlinear bending of a clamped circular plate on Pasternak foundation under a concentrated load at the center. This method is simple and easy to use. The numerical results show that the present solution is reliable. 相似文献
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Chen Zhonglin 《保鲜与加工》1989,(1)
According to the definition of luminous flux, and on the basisof the probability of fuzzy stechastic events in fuzzy mathematies, this paperstudies the fuzzy phenomena of the luminous flux increment obtained by thereciprocal reflection of light on indoor surfaces. This paper also suggests a newway to compute the transmission of luminous flux. 相似文献