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机械抽样     
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  mechanical sampling
     The students make use of the method of the mechanical sampling to carry out the investigation of growing stock. As a result,it shows that the method can shorten the time,and neduce the productivity and has a good result.
     在学生生产实习中采用了机械抽样方法进行木材蓄积量调查,结果表明,该方法缩短调查时间,降低生产成本,效果较好
短句来源
     In order to find out the principle factors that affect the seedling stand percent of Chinese pine in air-seeding, a survey and analysis was carried out in Luanping county, using the methods of random sempling and mechanical sampling.
     为了找出影响飞播油松成苗的主要因素 ,采用随机抽样调查方法和机械抽样调查方法 ,对滦平县历年的飞播区进行了调查分析。
短句来源
     One of 10 schizophrenics were assessed for disability due to schizophrenia according to isometric mechanical sampling.
     将精神分裂症致残情况按等距机械抽样的原 则每10人抽取1人进行残疾评定。
短句来源
  systematic sampling
     Methods: Using the concentrating and hatching method by nylon bags to detect schistosomiasis patients aged from 6 to 60 and utilizing a combined method of systematic sampling and environmental sampling techniques to make a sampling investigation of snails in rice planting areas.
     方法 :用尼龙袋集卵孵化法对6~60岁人群进行查病 ; 用环境抽样结合机械抽样对水稻种植区内的各种环境开展螺情调查。
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     Methods To use the means of the equal capacity stratified cluster sampling, simple random sampling and systematic sampling to identify objects, and 1080 inhabitants were surveyed by uniform questionnaire.
     方法 使用全国统一的艾滋病知识态度调查问卷,采取等容量分层整群、单纯和机械抽样相结合的方法,对10 80名城乡居民进行问卷调查。
短句来源
     Methods The multi-stage sampling method, i.e. cluster and stratification sampling combined with systematic sampling, was applied to conduct a household survey of residents in communities. The data of survey were recorded with database of Epi data, and analyzed statistically with analysis software of SAS.
     方法采取多阶段抽样方法,即整群分层抽样和机械抽样相结合的方法对社区居民进行入户调查,调查数据采用Epidata数据库录入,SAS分析软件进行统计分析。
短句来源
  “机械抽样”译为未确定词的双语例句
     Mechaical Sampling used in the investigation of the wood growing stock in forest areas
     机械抽样在林业伐区蓄积量调查中的应用
短句来源
     Based on Typical central Sampling and Machanical Sampling Theory,the method of rural enegy investigation was designed according to features of rural enegy. The whole Shaanxi province to be investigated is derided into 10 type regions of rural enegy.
     以典型中心抽样和机械抽样理论为基础,结合农村能源特点,拟定了农村能源的调查方法,将陕西省划分为10个农村能源类型区,按分区作了调查。
短句来源
     The investigation which are carried out in four different closed or unclosed forest stands shows that the closed forest can greatly change the composition and the structure of the insect community and make the number of the insect species and individuals, expecially the enemy group, increase obviously.
     利用机械抽样方法在4种不同封山类型林分内的调查表明,封山育林可以使得林内昆虫群落的种类数量尤其是天敌类群的种类数量显著增加;
短句来源
     In sample plots,sample trees are randomly or systematically selected and growing process is studied by stem analysis.
     即在标准地中采用随机或机械抽样方法选取样木,进行树干解析,获得样木生长过程;
短句来源
     Method From November 2003 to January 2005,6 496 rural people(≥40 years old) were selected form the whole population in 35 nature villages by simple random method and investigated with questionnaires by the special investigators from door to door.
     方法从2003年11月—2005年1月,通过机械抽样的方法,抽取招远市35个自然村,对≥40岁的农民6496人问卷调查。
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  mechanical sampling
The spectrometer was combined with a mechanical sampling module and an ultramicrobalance.
      
The rendering primitive is simply a triangle stripset whose points are the intestine mechanical sampling points and the mesentery root.
      
  systematic sampling
Systematic sampling of human necropsy pancreases has revealed that pancreatic polypeptide (PP) cells are not distributed equally in the gland.
      
Patients: 10 929 adult patients selected by a systematic sampling method.
      
The 3 groups, of 25 patients each, were generated by choosing the technique (PT tendon, 4 strand hamstring, and single hamstring plus extraarticular plasty) to utilize and followed for 5?years, with an alternate systematic sampling.
      
On the efficiency of systematic sampling in ratio and product estimation
      
In this paper the possibility of gain in efficiency in systematic sampling as compared to simple random sampling has been considered when a ratio or product estimator is used to improve upon the conventional unbiased estimator.
      
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  mechanical sample
Associated equipment includes versatile pneumatic sample transfer systems and three germanium gamma-ray spectrometers with mechanical sample changers.
      
Do the grinding either by hand or by mechanical sample grinder so constructed as to prevent the introduction of any impurity 5.
      
However the optical and mechanical sample were not subjected to any further digital noise reductions or re-mastering procedures.
      
One way to avoid homogenization error in subsampling is to make use of mechanical sample splitting devices.
      
The continuous noise level heard in the sound clips is lower in the optical sample than the mechanical sample.
      
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Based on Typical central Sampling and Machanical Sampling Theory,the method of rural enegy investigation was designed according to features of rural enegy.The whole Shaanxi province to be investigated is derided into 10 type regions of rural enegy. The rural area of the province consumes enegy of 9.346×10~(13)kilocalories (keal)annually,equal to 13.35 million tons of standard coal.In the whole province,1069 millon tons of fuelwood,accounting for 41.2% of total rural enegy,and 6.55 miLion tons of straw,accconting...

Based on Typical central Sampling and Machanical Sampling Theory,the method of rural enegy investigation was designed according to features of rural enegy.The whole Shaanxi province to be investigated is derided into 10 type regions of rural enegy. The rural area of the province consumes enegy of 9.346×10~(13)kilocalories (keal)annually,equal to 13.35 million tons of standard coal.In the whole province,1069 millon tons of fuelwood,accounting for 41.2% of total rural enegy,and 6.55 miLion tons of straw,accconting for 20.0% of total enegy, are consumed every year.87% of rural enegy is used for daily living and 13 % for productino.Among the regions there exist great differences on enegy consumption level,constitution,and proportions of daily living and produ- ction.

以典型中心抽样和机械抽样理论为基础,结合农村能源特点,拟定了农村能源的调查方法,将陕西省划分为10个农村能源类型区,按分区作了调查。陕西省农村每年耗能9.346×10~(13)千卡,折合1335万吨标准煤。全省每年烧掉薪材1069万吨,占农村总耗能的41.2%;烧掉秸杆655万吨,占农村总耗能的20%。农村能源消耗中生活用能与87%,生产用能占13%。不同类型区耗能水平、能源结构、生产用能和生活用能的比例差异很大。

In this paper, the influences of closed forest on the species composition, spatial and temporal structure, diversity and stability of insect community are studied. And the expression of insect community stability are aprroached, too.The investigation which are carried out in four different closed or unclosed forest stands shows that the closed forest can greatly change the composition and the structure of the insect community and make the number of the insect species and individuals, expecially the enemy group,...

In this paper, the influences of closed forest on the species composition, spatial and temporal structure, diversity and stability of insect community are studied. And the expression of insect community stability are aprroached, too.The investigation which are carried out in four different closed or unclosed forest stands shows that the closed forest can greatly change the composition and the structure of the insect community and make the number of the insect species and individuals, expecially the enemy group, increase obviously. The proportion of the natural enemy group in the insect community in closed forest stands increases by 33.89% more than that in unclosed forest stands. The vertical structure of the insect community becomes more complicated. In closed forest stands, the insedt species number and diversity index considerably increase with time,the number of the individuals changes gently, the community stability increases greatly, too.

为了探讨封山育林的抗虫机制及对害虫的营林管理对策,本文研究了封山育林对昆虫群落时空结构及多样性、稳定性的影响。利用机械抽样方法在4种不同封山类型林分内的调查表明,封山育林可以使得林内昆虫群落的种类数量尤其是天敌类群的种类数量显著增加;封山区天敌类群所占比例较未封山区增加33.89%,昆虫群落的垂直结构更加复杂;随时间的变化,封山区昆虫种类数及种类多样性增加幅度较大,个体数量变化平缓,群落的稳定性有较大增强。

A kind of method about construction of tree volume table-sample stem analysis,is suggested in this paper,In plot,sample trees are randomly selected and growing process is studied by stem analysis.The function about bark coefficent and bark ration is constructed by regression analysis.DBH and volume with bark in each age grade are estimated by the same factors without bark.In this way,several samples for volume table construction can be obtained from one sample tree.The practice with Phoede nanmu in school forestry...

A kind of method about construction of tree volume table-sample stem analysis,is suggested in this paper,In plot,sample trees are randomly selected and growing process is studied by stem analysis.The function about bark coefficent and bark ration is constructed by regression analysis.DBH and volume with bark in each age grade are estimated by the same factors without bark.In this way,several samples for volume table construction can be obtained from one sample tree.The practice with Phoede nanmu in school forestry farm proved that cutting and work ammont is greatly reduced but precision is high.

本文提出一种材积表编制样本资料收集的新方法──样木解析法。即在标准地中采用随机或机械抽样方法选取样木,进行树干解析,获得样木生长过程;通过建立树皮系数与树皮率回归模型,将样木解析后的各龄阶去皮直径和去皮树积转化为带皮直径和带皮材积;一株样木可获得龄阶数个编表样本。经四川林校林场楠木材积表编制实践,有减少编表样本收集工作量、消耗林木少的优点,且能达到精度要求,为珍稀树种材积表编制样本资料收集提供了新的依据。

 
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