有效

The importance of setting up correct concept of significant digit in analytical chemistry was also emphasesed.

介绍了有效数字与相对误差的关系，有效数字的记录、修约、计算等，强调了在分析化学中树立正确的有效数字概念的重要性。

Using quadratic rotational regression combination design to study the influence on yield and economic characters in different fertilizer and density of the rape, the result showed that the influence of density and fertilizer on yield and active silique per plant were significant but the quantity and weight of seed, while the influence of density on active silique per plant was higher than that of fertilizer but on yield was contrary.

结果表明，在本试验范围内，施肥量和密度对油菜单株有效角果数和产量均有显著的影响，对单株有效角果数的影响是密度大于施肥量，而对产量的影响则是施肥量大于密度；单株有效角果数的最佳组合为施肥量以纯氮227.0kg/hm2、密度9.4万株/hm2，产量的最佳组合为施肥量以纯氮235.7kg/hm2、密度10.6万株/hm2；当控制施肥量、密度分别为214.4—256.9kg/hm2、10.1—11.1万株/hm2时，油菜产量可达3000kg/hm2以上。

Secondly, according to the spectral correlation theory of second order cyclostationary processes, maximumlikelihood filters are used to estimate the cyclic spectra. By estimating the crossspectra of the two frequency shifted versions of cyclostationary signal, the cyclic spectra can be obtained. The analysis effective bandwidth of maximumlikelihood filters is studied in details. In case of cross-spectra estimation, the analysis effective bandwidth of maximum-likelihood filters is not correct. A new method to calculate the analysis effective bandwidth is presented.

第二，根据二阶周期平稳随机信号的谱相关理论，提出了循环谱密度估计的最大似然滤波器法，即采用最大似然滤波器估计出周期平稳信号的两个频移分量之间的互谱密度，从而得到了循环谱密度的估计；对最大似然滤波器的有效分析带宽做了详细的分析，指出了在互谱密度估计时以往的有效分析带宽不正确，并提出了互谱密度估计时的有效分析带宽的新的计算方法。

In this articl,the discrete computing formula s of AC vohage rms value,AC current rms value,active power are given with the strict mathematics derivation,the minimum sampling time per cycle is given dividedly in rms value and active power calculation.

提出了交流信号的电压有效值、电流有效值、有功功率的离散计算公式，并给出了严格的数学证明，分别得出了有效值和有功功率计算中每周波最少采样点数。

The calculative results show that the efficient thermal conductivity rises as temperature rises under a constant fiber volume fraction, and it is proportional to the third power of absolute temperature; it decreases as fiber volume fraction increases under high temperature; it increases as fiber volume fraction increases under low temperature, and it is in agreement with that is described in the literature.

此式计算结果表明：在纤维体积分率一定时，其有效导热系数随温度的升高而升高，且它是绝对温度的三次方关系；在高温条件下，其有效导热系数随纤维体积分率的升高而四川大学硕土学位论文有减少趋势；在低温条件下，其有效导热系数随纤维体积分率的增大而增大，与所查文献描述规律一致。

The results showed that the effective concentration of tertbutyl triazine for killing P. globosa and A. tamarense was 0.3 mg L-1 and 0.2 mg L-1, respectively, for 96 hours.

结果表明，特丁基三嗪能有效地控制和杀灭塔玛亚历山大藻和球形棕囊藻，其中96 h杀灭塔玛亚历山大藻的有效浓度为0.2 mg L-1，杀灭球形棕囊藻的有效浓度为0.3 mg L-1。

However, in case of the author's company, after inner-controlled system has been implemented, employees who need more time for learning, preparing and searching information are viewed as well performance workpeople with low cost per man-hour.

作者公司实施内控制度后，由於会计上可以认列之有效工时包括员工使用於工作上之所有时间，但是单位有效工时成本在运用於评量绩效时却发现有值得探讨的地方，必须花比较多时间学习、准备、测试、搜寻资料的员工，却变成是单位成本比较低，绩效比较好的员工，显然这些被认列的有效工时当中，包含没有加值效益的浪费现象。

The results showed that either of the extracted propolis had significant inhibitory effect on the level of triglyceride, total cholesterol, LDL-C,GPT and GOT in serum, and TC, TG and MDA in liver, but were ineffective on HDL-C, MDA, SOD and NO levels in serum. Ethanol extracted propolis also reduced the body weight, liver weight and liver index of hyperlipidemic SD rats, while water extracted propolis were adiaphorous.

结果表明：蜂胶醇提液和水提液均能有效抑制高脂血症SD大鼠血清中的甘油三酯、总胆固醇、低密度脂蛋白、谷丙转氨酶、谷草转氨酶的升高，并且能有效抑制肝脏组织中的TC、TG、MDA的升高，但对血清中的高密度脂蛋白、超氧化物歧化酶、丙二醛、一氧化氮的影响不明显；蜂胶醇提液能有效降低高脂血症SD大鼠的体重、肝重及肝指数，蜂胶水提液对体重、肝重及肝指数的影响则不显著。

The microorganism method to solves the landscape hydrophila group entrophication has the good function,is obviously degenerate the water body COD,also can suppress the growth of the chlorophyceae plant effectively;④Chemistry method maintenance water quality may oxidize effectively, degenerate the pollutant and some organic matter in water,can effective kill the algae;⑤The clear silt can eliminate the death algae and each kind of organic and inorganic substance,thoroughly eliminate the environment which the algae grow,therefore the clear silt to algaes government is the very thorough means.

微生物法对解决景观水体的富营养化有较好的作用，对水体COD的降解作用较明显，能够有效抑制绿藻类植物的生长；④化学方法维护水质可以有效氧化、降解水中污染物和一些有机物质，能够有效的杀灭藻类；⑤清淤能够把死亡的藻类和各种有机和无机物质清除掉，彻底清除藻类生长的环境，所以清淤对藻类的治理是很彻底的办法。

Results:thrity-one drugs were sfited by germinative test,twenty-one by agar diffusion method,fourteen by both method.

结果 ：应用芽管试验法筛选的有效药物有 31种，应用琼脂扩散法筛选的有效药物有 2 1种，其中两种方法均有效的有 1 4种。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了