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     The simulation system can effectively simulate movement and machining status for robot of EDM curved hole. It lay a well foundation for developing technology of machining curved hole and its robot in production practice.
     该仿真系统可方便地模拟出对曲线孔电火花加工机器人的加工和运动状况 ,为生产实践中开发曲线孔加工技术及其机器人提供了参考依据。
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     Objective To understand the growth development status for preschool children in Guangdong province, and to provide basis for the further interventions.
     目的 了解广东省学龄前儿童生长发育状况 ,为进一步改善学龄前儿童生长发育水平提供科学依据。
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     Objective To understand the growth development status for preschool children in Guangxi,and to provide basis for the further interventions.
     目的了解广西学龄前儿童生长发育状况,为进一步改善学龄前儿童水平提供科学依据。
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     Conclusions Team status of filling personnel could be all-around held by implementers and supervisors of injury surveillance through this quality evaluation method, Theory basis was provided for improving filling quality of injury surveillance card and optimizing the team structure of filling personnel.
     结论该质量评估方法可使伤害监测实施者和督导者全面掌握填报人员队伍状况,为优化填报人员队伍结构、提高伤害监测卡填报质量提供了理论依据。
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     [Objective]To provide guidance for control and prevention of TB in a military academy.
     [目的]探讨军队院校这一特殊群体中,入学新生结核感染状况,为院校结核病控制和防治工作提供借鉴。
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     OBJECTIVE Analyse the working situation of Bao'an District's meternal health management to provide a further basis for maternal and child health care work decision-making.
     目的分析宝安区孕产妇系统保健管理工作状况,为进一步做好特区妇幼保健工作提供决策依据。 方法对宝安区2001年10月—2005年9月孕产妇系统保健工作进行统计分析。
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     Objective: To study the psychological health of postgraduate freshmen.
     目的:探讨硕士研究生新生的心理健康状况,为更有效的做好研究生的教育、管理工作提供心理学依据。
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     Objective To investigate the nutrition and health status of residents in Zhejiang Province,and provide the scientific basis for the establishment of nutrition improvement and chronic diseases control and prevention policies.
     目的了解浙江省居民营养与健康状况,为制定改善居民营养和预防控制慢性病提供依据。
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     water volume condition;
     水量状况;
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     Status Quo of Performance Forecasting
     业绩预告状况
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     A Research on Bullying in Primary Schools
     小学生欺负行状况
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Methylation-sensitive restriction enzymes (HpaII, HhaI, Bsh1236I, AciI) increased the analysis sensitivity and made it possible to establish the methylation status for 18 CpG dinucleotides of the RASSF1A promoter region.
      
Based on its phylogenetic position, the new acetate-oxidizing syntrophic bacterium is proposed in the Candidatus status for a new genus and species: "Candidatus Contubernalis alkalaceticum."
      
Based on Reference index, poor ecological status for the studied part of the Slatina river was estimated.
      
Soil fertility status for N is low to medium (224 to 348 kg/ha), P is medium to high (87 to 320 kg/ha) and K ranges from medium to high (158 to 678 kg/ha).
      
Development and validation of a short measure of health status for individuals with amyotrophic lateral sclerosis/ motor neur
      
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This paper deals with hob grinding for involute gears.Strictly speaking,theworm surface of the hob must be an involute helicoid which possesses an intersectingcurve in axial plane convex.But this helicoid cannot be generated on a contemperanyrelieving lathe,therefore,in engineering,it is often superseded by a helicoid withstraight line generater in axial plane.In the backing-off process,the edge of thecutter has a radial motion,and simultaneously the blank and the relieving tool havea relative helical motion,resulting...

This paper deals with hob grinding for involute gears.Strictly speaking,theworm surface of the hob must be an involute helicoid which possesses an intersectingcurve in axial plane convex.But this helicoid cannot be generated on a contemperanyrelieving lathe,therefore,in engineering,it is often superseded by a helicoid withstraight line generater in axial plane.In the backing-off process,the edge of thecutter has a radial motion,and simultaneously the blank and the relieving tool havea relative helical motion,resulting in a helicoid.While in grinding,the hob profileis an enveloped surface of a grinding wheel.This is the fundamental difference be-tween the two processes.The effort for obtaining a perfect helicoid in grinding has been proved fruitess.It is because,in this case,the conjugate surface of the hob relief is a column facewhich can not be superseded by a surface of revolution.As a result,only approximateones can be expected. It is no doubt that the main reason responsible for deviation in grinding is theconfiguration and the position of contact lines between hob and wheel.It is foundout that the optimum condition is for the lines of contact to exist near a straightgenerator of the hob relief in a horizontal axial plane which coincides with the edgeof the relieving tool.We are thus confronted with the problem of how to find outthe spatial position of a grinding wheel to agree with the required optimum condition.Imagine a hyperboloid of one sheet intersects with the helicoid of hob relief with onesuperimposed curve being the common straight generator of the two surfaces.Generalyspeaking,there must be another common curve in them and interference must existbetween the two superimposed curves.If we change the relative spatial position of theaxis of the hyperboloid and adjust its parameters,the interference can be decreased tominimum.When the interference area is lessened sufficiently,the two surfaces can beconceived as having approximate tangent contact along the horizontal straight genera-tor and thus the optimum position of wheel axis can be ascertained.The paper goes on to deal with another important problem concerned with fini-shing accuracy,i.e.the boundary between enveloped area and forming area of thefinished hob.In grinding,the radial motion of the grinding wheel is often limited,inthat,when it reaches a certain position,interference will occur between wheel peri-phery and the next tooth edge.This position is the final position of the grindingwheel.The remaining area in hob relief is the forming area which retains the configu-ration of the grinding wheel,in which case no accuracy can be expected.

本文讨论渐开线齿轮滚刀的铲磨问题。严格地说,渐开线齿轮滚刀的基本蜗杆曲面应是渐开线螺旋面,其轴断面内的截线是一条中凸的曲线。但是这种螺旋面不可能用现有的铲齿机床加工出来,所以工程上常用轴断面截线为直母线的螺旋面来代替。在铲齿工序中,铲刀刃口具有一个径向运动,同时毛坯和铲刀作相对螺旋运动切出螺旋面.而在铲磨中,刀齿侧面为砂轮的包络曲面,这是两种工序的基本区别。本文证明了在铲磨中不可能获得准确的螺旋面.因为在铲磨情况下,标准后隙面的共轭曲面为一柱面,不可能用一个回转的砂轮曲面来代替.所以铲磨加工只能得到近似的曲面。毫无疑问,影响铲磨误差的主要因素在于砂轮与滚刀之间的接触线的位置和形状。这一因素中的最佳状况为,接触线位于后隙面上的水平直母线附近。这一直母线也即铲齿时的铲刀片刃口直线。于是就提出了这样的问题:如何找到砂轮轴线在空间的最佳位置以满足这一条件。设想一个单叶双曲面和滚刀螺旋面相交,交线之一为公共直母线。一般地说,两曲面之间必存在有另一交线。两交线之间为两个曲面的干涉区。改变单叶双曲面轴线的空间位置并调整其参数,可以使干涉区减为最小。当干涉区域缩到足够小时,这两个曲面可以认为是近似地沿直母线相切,...

本文讨论渐开线齿轮滚刀的铲磨问题。严格地说,渐开线齿轮滚刀的基本蜗杆曲面应是渐开线螺旋面,其轴断面内的截线是一条中凸的曲线。但是这种螺旋面不可能用现有的铲齿机床加工出来,所以工程上常用轴断面截线为直母线的螺旋面来代替。在铲齿工序中,铲刀刃口具有一个径向运动,同时毛坯和铲刀作相对螺旋运动切出螺旋面.而在铲磨中,刀齿侧面为砂轮的包络曲面,这是两种工序的基本区别。本文证明了在铲磨中不可能获得准确的螺旋面.因为在铲磨情况下,标准后隙面的共轭曲面为一柱面,不可能用一个回转的砂轮曲面来代替.所以铲磨加工只能得到近似的曲面。毫无疑问,影响铲磨误差的主要因素在于砂轮与滚刀之间的接触线的位置和形状。这一因素中的最佳状况为,接触线位于后隙面上的水平直母线附近。这一直母线也即铲齿时的铲刀片刃口直线。于是就提出了这样的问题:如何找到砂轮轴线在空间的最佳位置以满足这一条件。设想一个单叶双曲面和滚刀螺旋面相交,交线之一为公共直母线。一般地说,两曲面之间必存在有另一交线。两交线之间为两个曲面的干涉区。改变单叶双曲面轴线的空间位置并调整其参数,可以使干涉区减为最小。当干涉区域缩到足够小时,这两个曲面可以认为是近似地沿直母线相切,这样最佳砂轮轴线位置就可以确定了。与铲磨精度有关的另一重要因素是滚刀后隙面上的包络区和成形区的分界。在铲磨中,砂轮的径向运动常受到限制,这是因为当其运动到某一位置时,在砂轮外圆和第二刀齿刃口之间会发生干涉。这一位置是砂轮运动的最终位置。这时,留在滚刀后隙面上的剩余区域是成形区。成形区保留了砂轮原有的形状,所以完全失去了所需的精度。就这一问题,本文也作了一些讨论。

On the basis of the thermal conditions of the byproduct coke oven,the possible energy saving approaches are reviewed and the author's views on the possible ways in which the byproduct coke ovens in use in China may cut dour their consumption of energy are described.

本文以现代焦炉热状况为基础,综述了炼焦炉节能的途径,对我国现有焦炉如何实行节能提出了看法。

Fourteen experiments,using the methods of soil culture, sand culture and field plot culture etc.,were carried out in the last three years (1981-1983). The chief characters of the plant Sesbania cannabina Pets, such as plant height, stem and leaf yield, nodule dry weight,nodule number and N2-fixation activity of root-nodule per plant etc.,were lower under flood culture condition than under upland culture condition with soil moisture holding capacity contrary to the former statement that Sesbania cannabina Pers....

Fourteen experiments,using the methods of soil culture, sand culture and field plot culture etc.,were carried out in the last three years (1981-1983). The chief characters of the plant Sesbania cannabina Pets, such as plant height, stem and leaf yield, nodule dry weight,nodule number and N2-fixation activity of root-nodule per plant etc.,were lower under flood culture condition than under upland culture condition with soil moisture holding capacity contrary to the former statement that Sesbania cannabina Pers. grew better under flood culture than under upland culture.The growth curve reflected the relationship between plant growth (Sesbania cannabina Pers.)and soil moisture was in the cubic parabola shape with the soil moisture holding capacity as the vertex. This differed from that of quadratic parabola shape with other leguminous plants as formerly stated. Sesbania cannabina Pers., was more tolerant to flooding than drought.To Sesbania cannabina Pers. it appeared more harmful during water deficiency (less than 60% soil moisture holding capacity) than during water excess (submergence).In some occasions,plant growth appeared better under flood culture than under upland culture because under field conditions the soil moisture was less than 60% soil moisture holding capacity.Thus if irrigation facilities were lacking, the flood culture method might be preferred.

经过三年用土培、砂培、田间小区等方式做了十四批试验。得出淹水栽培的田菁在株高、茎叶产量、根瘤数量与重量、株瘤固氮总活性等主要性状上均劣于土壤水分状况为田间持水量的旱栽的结论。并找到了其必然性的原因。否定了田菁淹水栽培优于旱栽的说法。 田菁与土壤水分关系的生长曲线是以田间持水量为顶点的三次抛物线型。有别于前人以其他豆科作物作出的二次抛物线型。田菁耐淹力强于耐旱力。缺水(低于田间持水量的60%)的危害比水分过多(淹水)严重。生产中常出现淹水优于旱栽的现象,是两害相较轻为优的反映。在灌溉设施不完善的情况下,生产中实行淹水栽培还是可取的。

 
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