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general high
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     The results indicate straight ∑3 coherent twin boundaries of over 60%(all values are given as a length fraction of the total boundary length) are introduced in the alloy when annealed at 220℃ for 72 hours after cold rolling to 10% reduction in thickness. Such boundaries are not distributed in a network of general high angle boundaries(HABs) and the GBCD is not optimized.
     结果表明:经10%冷轧变形后在220℃退火72小时,合金内形成了比例超过60%的平直的∑3共格孪晶界,这类晶界不处在由一般大角度晶界构成的晶界网络上,不能使合金的GBCD得到优化;
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     This card mainly uses a DSP TMS320C6416 from TI and FPGA XC2V1000 of VIRTEX2 series from XILINX ,which could flexibly realize many kinds of signal processing algorithm program in FPGA and DSP, so meet the general high requirement of four-channel high speed AD data acquisition and real-time processing.
     该数据采集处理卡主要采用TI公司的TMS320C6416数字信号处理器和XILINX公司VIRTEX2系列的XC2V1000FPGA芯片,可以灵活的在FPGA和DSP中实现各种信号处理算法程序,从而满足四路模拟信号高速采集和实时处理需求。
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     The design and practice of general high school physics activity curriculum
     普通高中物理活动课程的设计与实践
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     The Development of AMC-600 General High Accuracy Measurement and Control System
     AMC-600通用高精度测控系统的研制
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     The paper makes programs for software design with general high language VC++6.0 and simulates for control system by MATLAB 6.1, and avoids using costly professional development software in price.
     此课题中的软件设计采用了通用高级语言VC++6.0编制程序和MATLAB 6.1进行控制系统仿真,避免使用价格昂贵的专业开发软件。
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     Experimental results show that the method to prepare BOPA is similar with general high viscosity Nylon 6. Adopted two-step way,by the evaluation system and (ordinary) decompression system of the pressure polymerization and the addition of special catalyst,Nylon6 slab with viscosity 3.5 could be obtained.
     试验结果表明,双向拉伸膜用尼龙树脂的聚合方法与普通高粘度尼龙6的制备基本相同,通过添加特殊的催化剂,采用加压前聚、(常)减压后聚的两步法聚合工艺可制得相对粘度≥3.5的尼龙6切片,但必须加入各种添加剂,以满足双向拉伸尼龙薄膜时对强度、弹性模量和摩擦系数等性能的要求。
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     general;
     (2)总论;
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     In general,L.
     L.
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     Grinding of High Degree of Finish on the General Grinder
     在普通磨床上进行高光洁度磨削
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     The results showed that the managers' motivation was high in general.
     结果发现 ,企业管理人员的总体动机水平普遍较高 ;
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     For the high complexity of G.
     针对G.
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  general high
At general high-angle grain boundaries, on the other hand, the effects of boundary structure are simpler and better understood.
      
Under simple shear loading conditions, however, the highest stresses were observed at general high-angle grain boundaries.
      
Long-term exposure to water vapor results in an irreversible decrease in local deformations and in lowering the excessive negative charge of the skeleton, which manifests itself in a general high-frequency shift of the bands by 5-7 cm-1.
      
The general high-frequency, rough-surface reflection process is treated by the method of stationary phase.
      
In general high heat input welds showed low ductility mainly on account of the strain localization effects at the grain boundary alpha phase.
      
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The synthetic catalogue of right ascensions for time service (CTC) was compi- led through the synthesis of time determination data obtained with five photoelectric transits and a visual transit in five observatories or observation stations (Shanghai Observatory, Purple Mountain Observatory, Peking Observatory, Shensi Observatory, and the provisional observation station of Shanghai Observatory in Hainan Island). This catalogue lists 1156 stars with magnitude interval 0.~m1~6.~m6, and declination interval -30°~+66°.In...

The synthetic catalogue of right ascensions for time service (CTC) was compi- led through the synthesis of time determination data obtained with five photoelectric transits and a visual transit in five observatories or observation stations (Shanghai Observatory, Purple Mountain Observatory, Peking Observatory, Shensi Observatory, and the provisional observation station of Shanghai Observatory in Hainan Island). This catalogue lists 1156 stars with magnitude interval 0.~m1~6.~m6, and declination interval -30°~+66°.In compiling the catalogue, corrections and systematic smooth- ing of the right ascensions of stars were carried out on the basis of FK_4 catalogue, but no corrections of the vernal equinox were made, and no attempt was made to establish our own system of proper motions, therefore CTC is a relative catalogue. Observational data spreading ove, 3-5 years were utilized, the total number of star observations reached 76847, so the catalogue has a rather high precision, especially within the declination zone -5°-+56°, having 1043 stars, the precision of position determination in this zone is in general higher than ±4 ms. In this paper, the method of compiling the CTC catalogue is described, and the precision discussed. As the CTC catalogue has been separately published, in this paper only the right ascensions (1975. 0 equinox) which have been determined by three observatories or stations are given for future reference, together with the epoch of observation, number of observation, total standard error, and internal standard error.

我国综合授时赤经星表(简称CTC),是利用我国五个天文台站(上海天文台,紫金山天文台,北京天文台,陕西天文台以及上海天文台的海南岛临时观测站)的五个光电中星仪和一个目视中星仪测时资料综合而成的.该星表共包括星等范围为0.~m1-6.~m6,赤纬区间为-30°-+66°的1156颗恒星。该星表以FK_4星为基础进行了恒星赤经的个别改正和系统修平,未进行春分点改正和没有建立自己自行系统,因此是一个相对星表.该星表采用了3-5年的观测数据,总观测星次达76847次,从而达到了比较高的精度,尤其是在赤纬带-5°-+56°范围内的1043颗星,其定位精度一般均优于±4ms.在本文中给出了CTC星表的编算方法及其精度.由于CTC星表已专刊发表,本文仅发表CTC星表的三个台站以上观测过恒星的赤经位置(1975.0历元),观测历元,观测次数,赤经位置的总精度σ及内部精度m,以供今后星表工作参考.

In order to determine comprehensively the quality of Yusu 1, a newly improved breed of sweet potato, we have measured the nutritional composition of its stem, leaf and stem apex by biochemical analysis, and compared them with the corresponding parts of other two improved breeds, Su-potato-18 and Nong-Da-Hong, We have also compared some of their root tubers. The results indicate that, except some differences in the content of a few components, generally there is no obvious difference in the content of carbohydrate,...

In order to determine comprehensively the quality of Yusu 1, a newly improved breed of sweet potato, we have measured the nutritional composition of its stem, leaf and stem apex by biochemical analysis, and compared them with the corresponding parts of other two improved breeds, Su-potato-18 and Nong-Da-Hong, We have also compared some of their root tubers. The results indicate that, except some differences in the content of a few components, generally there is no obvious difference in the content of carbohydrate, thick protein, amino acid, and vitamin C. But the content of reducing sugar, soluble sugar and total sugar in the stem is always higher than that in the leaf in the same breed, and that in the leaf is always higher than that in the stem apex:think protein and amino acid are in general higher in the stem apex in the leaf, and those in the leaf are higher than those in the stem; and all are higher than those In the corresponding root tuber. The stem, the leaf, and the stem apex don't contain cy-steine. As for the content of vitamin C, it is always higher in the leaf than in the stem apex, and in the stem apex than in the stem. There is no obvious law about the content of calcium, phosphorus and iron in either the corresponding parts of the three different breeds or the stem, the leaf and the stem apex of the same breed. In the stem, the leaf and the stem apex of each breed, there are abundant calcium, phosphorus and iron, and the content is higher than that in the correspondng root tuber

为了全面确定甘薯新品种“渝苏1号”的品质,我们对其地上部分的茎、叶、蔓尖的营养成分进行了生化分析测定.并与优良品种“徐薯18”、“农大红”相应部分进行比较,有的还与块根比较.结果表明:糖类物质、粗蛋白、氨基酸、维生素C等的含量,品种间茎、叶、蔓尖相应部分比较,除少数成分的含量有差异外,一般差异不大并无明显规律性.但同一品种内茎、叶、蔓尖相比,每个品种还原糖、可溶性糖、总糖的含量,总是茎高于叶,叶又高于尖;粗蛋白和氨基酸的含量,总是蔓尖高于叶,叶又高于茎,而且一般比相应块根的含量高;同时,茎、叶、蔓尖不含半胱氨酸;维生素C的含量,总是叶高于尖,尖又高于茎.至于钙、磷、铁的含量,无论是品种间相应部分比较,或同一品种内茎、叶、蔓尖相比,均无明显规律性,但每个品种茎、叶、蔓尖均含丰富的钙、铁、磷,而且含量比相应块根高.

To verify the extreme value of function f(x,y) at the stat-ionary point (x.,y.) with second -order partial derivatives, sometimes the probable result is that the discriminant f2xy (x.,y.) - x(x. ,y.) ·fyy(x.,y.) is equal to zero. In that case, the original test is not effective and the further inspection will be needed. Thus, this paper gives a method of test which makes use of the general higher-order partial derivatives.Suppose that function f(x,y) at the point (x.,y.) can be expanded ia n th-order...

To verify the extreme value of function f(x,y) at the stat-ionary point (x.,y.) with second -order partial derivatives, sometimes the probable result is that the discriminant f2xy (x.,y.) - x(x. ,y.) ·fyy(x.,y.) is equal to zero. In that case, the original test is not effective and the further inspection will be needed. Thus, this paper gives a method of test which makes use of the general higher-order partial derivatives.Suppose that function f(x,y) at the point (x.,y.) can be expanded ia n th-order Taylor formula, and it is written in the form △f = Pn (h,k) +ε,herethis ε tends to zero when p tends to zero. And suppose that either all the partial derivatives of f(x,y) at (x.,y.) in which the numerals of order is not bigger than some positive integer N are equal to zero, or all the partial derivatives of f(x,y) in some neighborhood at (x.,y.) in which the numerals of order is bigger than N+l are identically zero. As such the higher-order partials test for extreme value of function of two variables can be phrased this way.If PN(h,k) is either positive identically or negative identically, then f(x,y) has an extreme value at (x.,y.);If PN(h,k) is both positive and negative, then f(x,y) has no extreme value at (x.,y.).

用二阶偏导数来判定函数f(x,y)在其驻点(x,y_0)处的极值,有时可能有判别式f_(xy)~2(x_0,y_0)-f_(xx)(X_0,y)·f_y(x,y_0)等于零的情况.这时,原来的判别法失效,从而需要作出进一步的考察.为此,本文特给出一种利用一般的高阶偏导数的判别方法.设函数f(x,y)在点(x,y_0)处可展开成n阶泰勒公式,并将其写成△f=P(h,k)+ε.式中P_n(h,k)=sum from m=1 to n(1/(m+1)!)(h((?)/(?)x)+(k(?)/(?)y))~(m 1)f(x,y_0);当ρ趋于零时ε趋于零.同时还设函数f(x,y)在点(x,y_0)处所有阶数不大于某个正整数N的偏导数都等于零,或在点(x,y_0)的某个邻域内所有阶数大于N+1的偏导数都恒等于零.那末,二元函数极值的高阶偏导数判别法可简单地归结为:若P_N(h,k)恒正或恒负,则f(x,y)在点(x_0,y_0)取得极值;若P_N(h,k)有正有负,则f(x,y)在点(x_0,y_0)处不取极值.

 
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