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square fields
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  方野
     Results (1) This method gives value for Sc that differs from measured values by no more than 0.6% for square fields 4? cm to 40? cm wide,symmetric rectangular fields with long to short axis ratio as great as 10, and irregular fields formed by blocks.
     结果 (1) 对于4 cm ×4cm ~40cm ×40 cm 的方野、长短轴比最大为10 的矩形野以及挡铅形成的不规则野,Sc 的计算结果与测量结果的最大偏差<0 .6 % 。
短句来源
     Methods Firstly,the scatter factors of square fields have been measured and the relation between the scatter factor and the length of fields has been made;
     方法  ( 1 )通过测量方野的散射因子 ,建立方野散射因子与射野边长的拟合公式 ;
短句来源
     Methods The percentage depth dose(PDD) curves on the central axis of various energy narrow strip electron beams were measured with radiation scanning system for Varian 2300 C/D linear accelerator. The characteristics of dose parameters of R_(100),R_(90),R_(50) and R_P were analyzed and compared with those of standard square fields.
     方法用辐射野扫描系统对瓦里安2300C/D直线加速器多种能量电子束窄条野进行中心轴深度剂量扫描,分析R100、R90、R50及RP等参数的变化规律,并与标准方野进行比较。
短句来源
     Results:(1) The depth of all narrow strip electron beams were less than those of the standard square fields. That was especially large in 2 cm width than in 3 cm width under the some energy.
     结果:(1)所有窄条野的R85值均小于相应的标准方野,而相同能量下,宽度为2 cm的窄条野明显大于宽度为3 cm的窄条野。
短句来源
     Depth dose and profile calculation results for three standard square fields are in good agreement with the measurement results for 6 MV photon beam.
     通过比较6MV光子束3个标准方野的深度剂量和离轴比分布的计算结果和测量结果,取得了较好的吻合。
短句来源
  方形照射野
     It based on the basic beam data such as central axis percentage depth dose,off axis ratio and collimator scatter output factor,which were measured on Fyc 50H treatment unit for a number of square fields.
     它使用基本的剂量学数据 ,如射野中心轴百分深度剂量、离轴比和准直系统散射输出因子等 ,这些数据在Fyc 5 0H治疗机上用方形照射野测量得到。
短句来源
  “square fields”译为未确定词的双语例句
     Secondly,the equivalent square fields of rectangular fields are calculated according to the formula established by kim.
     ( 2 )利用 Kim的经验公式 ,计算矩形野的等效方边长 ;
短句来源
     Results The calculations for standard square fields sizes and irregular field are in good agreement with measurement.
     结果比较规则野和不规则野的计算和测量结果,规则野误差小于2%,不规则野在10%等剂量线误差稍大。
短句来源
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  square fields
A recording electrode was in point Oz, according to the 10-20 system; dimensions of the chess pattern square fields and their contrast varied from 1.8 to 120' and from 2 to 100%, respectively.
      
Spherical measures of exceeding a low level are considered for strongly dependent chi-square fields.
      
Ecological method was applied by using the town map with square fields of 1 km2 and the town was divided into 24 fields.
      
The cells in five square fields were counted under a light microscope.
      
Figure A-3 Tissue output ratio curves for various square fields in polystyrene for a Co-60 beam.
      
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First, We give an approximate formula (2) forcalculatingtheintegral integral from n=0 to 1(x,{Nx})dx, Applying(2), (ll)and(21), We get integration formulae of boundary type involing derivative term for double integrals on square field and triangular field respectively. Then, putting sufficiently great number IV and small number m to (15)and(22) we can actually get a series of integration formalae.

本文首先给出计算积分integral from n=0 to 1(f(x,{Nx})dx)的一个近似公式(2),利用(2)及公式(11)、(21)分别得到正方形域及三角形域上一个带微商项的边界型求积公式(15)及(22),在(15)、(22)中取充分大的N及适当小的m就可以具体构造出一系列带微商项边界型二重求积公式。

The low capability of sprouting and branching is a major factor which restricts early bearing of Rails apple. So far, none of the agriculture technical treatments which have been normally applied can solve this problem. Synchron-istically performed in the eight-year-old Rails apple gardens in Gu'an' and Baxian of Hebei province,a branching agent treatment experiment according to three factors(saying period,location,bud amounts),each differing in nine levels,by means of Latin Square field designing was...

The low capability of sprouting and branching is a major factor which restricts early bearing of Rails apple. So far, none of the agriculture technical treatments which have been normally applied can solve this problem. Synchron-istically performed in the eight-year-old Rails apple gardens in Gu'an' and Baxian of Hebei province,a branching agent treatment experiment according to three factors(saying period,location,bud amounts),each differing in nine levels,by means of Latin Square field designing was arranged. In early Jnue, besed on the theory of quantification, the author analysis on the data of 162 trees and 11340 buds that had been treated, the following results were derived. 1 . The application of the branching agent has obviously increased the ability of aprouting and branching of the one-year-old wood. 2.The effect is the same, no matter if the period of branching agent is applied before of after sprouting. 3. Within the quantification range, varying the amount of painted buds does not influence the ability of branching. 4. The percent of sprouting is highest when the painted buds are located on the lower part of the one-year-old wood. These results have important practical significance for apple varietis with low sprouting and branching capabilities such as Rails.

萌芽力和成枝力低是国光苹果始果晚的限制因素,目前常规的农业技术措施尚不能解决这一问题。本研究在河北固安、霸县两地8年生同龄苹果园中同时进行,用拉丁方等田间设计方法,安排了3个因素(时期、部位、芽数)、9个水平的发枝素处理试验。1987年6月初对处理的162株树、11340个芽所得的实测数据,用数量化理论Ⅰ分析得出:(1)发枝素的使用对1年生枝的萌芽力和成枝力有显著效果。(2)萌芽前后不同时期应用发枝素有同等效果。(3)不同涂抹芽量在所用数量范围内不影响萌芽力。(4)在枝条的下部涂抹萌发效果最好。这些结果对萌芽力和成枝力差的国光等品种具有重要的实践意义。

The calculation method for the radiation field output factor developed in this paper can be applied to the calculation for the output factors of square and rectangular fields, with the measured output factors of several square fields and one rectangular field, other output factors can be calculated out. Simple and easy, accurate and fewer measured data, this method also can be easily processed by computer.

射野输出因子,简称野因子,是放射治疗中重要的剂数学参量。引入野因子后,使临床的表格制作和剂量计算大为简化。野因子定义为水模中该野与参考野在PDD归一深度处,射束中心轴线上的剂量率之比。通常,PDD的归一深度选在水模中的最大剂量深度dm,参考野选用10_(cm)×10_(cm)正方野。国内曾有人对正方野的野因子进行过研究,给出了计算方野野因子的经验公式。但是,对矩形野,此公式不能满足临床需要。对于矩形野,以往的作法是通过一系列测量,绘出野因子分区图供临床应用。近似地认为在同一区域内野因子相等。这种方法的缺点之一是测量的工作量太大;另一种更为粗略的方法,是把PDD计算中等效方野的概念用于野因子计算。这两种方法的共同缺点是误差较大。由于它们都只能给出规律性不明显的大量离散数据,不便于放疗剂量电算化。本文建立的方法,以实测数据为基础,以理论计算为依据,简便、准确,克服了以往方法的缺点,较好解决了野因子计算问题。

 
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