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Abstract: Soil incubation experiments were conducted in lab to delineate the effect of soil temperature and soil water content on soil respirations in broad-leaved/Korean pine forest(mountain dark brown forest soil),dark coniferous forest(mountain brown c
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文摘:为了研究土壤温度和土壤含水量对阔叶红松林(山地暗棕壤)、云冷杉暗针叶林(山地棕针叶林土壤)和岳桦林(生草森林土)的土壤呼吸的影响,于2001年9月在长白山进行了土壤实验.利用增加土壤样柱的含水量,将土壤含水量分为9％,、21％、30％、37％和43％5个等级,土壤样品分别在0、5、15、25和35℃的温度下保持24小时.阔叶红松林土壤在0(35℃范围内,土壤呼吸速率与温度呈正相关.在一定的含水量范围内(21％(37％),土壤呼吸随含水量的增加而升高,当含水量超出该范围,土壤呼吸速率则随含水量的变化而 |
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Abstract: Solving a mathematical problem is a procedure of seeking out a road that links the initial state with the final state of the problem in problem space.The mathematical method is used to discuss this process.
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文摘:数学问题的解答，是在问题空间中寻求一条由问题初始状态到目标状态的通路，用数学方法描述这一过程. |
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Abstract: Some economic policies effecting hydropower exploitation in Chinaare discussed and six suggestions are proposed accordingly:decreasing taxes on power project; establishing reasonable formation mechanism of grid electric energe price; establishin
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文摘:论述了影响我国水电开发的一些经济政策，并且有针对性地提出了六条建议：减轻电力项目税赋；建立合理的上网电价形成机制；建立合理的水电投资分摊机制；明确输电工程投资回收渠道；出台水电站调节效益分配办法；建立水电投资基金. |
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Abstract: Some frontier technologies and design concepts in the development of analytical instrumentation in recent years are reviewed.
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文摘:评述了近年来现代分析仪器发展的前沿技术和设计思想。 |
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Abstract: Some important achievements of SAW mechanical quantity sensors at home and overseas are reviewed briefly, the characteristics and basic working principle of SAW mechanical quantity sensors are expounded, in the meantime, the relationship between
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文摘:扼要回顾了国内外在声表面波力学量传感器方面一些重要的成就，阐述了声表面波力学量传感器的特点、基本工作原理，简单推导了该传感器输入-输出关系，并对声表面波其他传感器作了介绍。 |
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Abstract: Some important principles in the design of split box molding are discussed concerning the selection of mold joint，the methods of location and the design of gating system.It has been proved in production that the principles discussed had great ef
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文摘:以床身为例，讨论了劈箱造型工艺设计中的几个重要原则：包括分型面的选择、定位方法、分芯方法及浇注系统设计等；生产实践证明，这些原则对铸件生产成本和品质有重要的影响。 |
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Abstract: Some new technological measures,such as new reactors,gel method to remove silicon,direct dissolve acid to recrystallizate and direct calcine from zirconyl chloride,were used to reform zirconium dioxide production process.As a result,the material
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文摘:采用新型反应器及胶凝除硅、直接酸溶重结晶、直接煅烧等技术对二氧化锆的生产工艺进行了改革，降低了原材料消耗及能耗，减少了废液排放量，并将回收的废物加工成副产品白炭黑，在生产过程中防治污染。 |
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Abstract: Some optimum fitting methods for treating the measured lift data of the symmetrical cam profile are presented in the previous decades.
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文摘:已有的配气凸轮实测升程数据的优化拟合研究基本上都是针对对称型配气凸轮展开的。 |
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Abstract: Some problems of quantum mechanics can be solved easily by means of the invariant of differential equation.
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文摘:利用常微分方程的不变式，非常方便地求解了一些量子力学问题. |
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Abstract: Some shortcomings of current ultrasonic thickness gage arediscussed. And some measures for improving the transducer, circuit and other parts of the gage are put forward.
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文摘:阐述了目前超声测厚仪的一些不足，并在探头和电路等方面提出了一些改进措施。 |
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Abstract: Some shortcomings on the design of vertical parting hot box are reviewed briefly , and optimization of the design of parting line, direction of shoot sand, push core mechanism ,taking core mechanism, negtive parameter of parting line, and enlarg
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文摘:简单评述了垂直分盒热芯盒设计中目前尚存在的一些不足之外，较细地阐述了分盒面、射砂方向、射砂口面积、顶芯机构、取芯机构及分盒负数，凸台尺寸放大制作等的优化设计技巧和优选方案。 |
