查询词典 systematic sample

All subjects in the sample of 600 individuals were selected by a stratified systematic random sampling method and interviewed by trained interviewers.

本研究采横断面研究方法，以苗栗县所有65岁以上老年人作为研究母群体，采分层随机抽样的方法，共得到600位样本，其中男性302人，女性298人。

"Any new study should be carefully evaluated in a systematic fashion before its conclusions are accepted and a new therapy is applied to patients," Laine writes, noting difficulties in Jensen's study including unequal distribution of confounding variables, outliers, small sample size, endpoints, and premature discontinuation.

Laine写道：「任何一项新的研究，在结论被认可以前，在将一种新疗法应用于患者以前，应该以系统的方式被仔细评估。」。他还指出Jensen研究的难点包括：混淆变量的不平等分配，局外人的参与，样本小，终点，以及研究的提前终止。

"Any new study should be carefully evaluated in a systematic fashion before its conclusions are accepted and a new therapy is applied to patients," Laine writes, noting difficulties in Jensen's study including unequal distribution of confounding variables, outliers, small sample size, endpoints, and premature discontinuation.

Laine写道：「任何一项新的研究，在结论被认可以前，在将一种新疗法应用於患者以前，应该以系统的方式被仔细评估。」。他还指出Jensen研究的难点包括：混淆变数的不平等分配，局外人的参与，样本小，终点，以及研究的提前终止。

The systematic biological technique may be introduced in future, and clinical trial requires multi-center, large sample, and multi-level design.

今后有可能引入系统生物学的研究技术用于腧穴特异性的基础研究，临床试验需要多中心、大样本、多水平的设计以得出更有说服力的证据。

In the study of microwave sintering of BaTiO〓 PTC ceramics, when the applied microwave power are above than a certain value, the abnormal axial shrinkage of the sintered sample will occur, by the analysis of SEM and XRD, it is found the microstructure and phase are different with conventionally sintered sample, the reason for this phenomenon is due to orientational grain growth by the action of electric field in the microwave sintering process.

微波烧结BaTiO〓电子陶瓷时，当所加的微波功率超过一定值时，首次发现烧结样品出现轴向异常收缩现象，采用SEM、XRD等分析发现其微观结构与常规烧结有巨大的差异，这是BaTiO〓材料的晶粒在微波场中受电场力作用而发生的取向生长造成的。

The differential eguations and boundary conditions are established, based on these hypotheses. The theoretical formulary about sample atom number with different diffusion coefficient are reasoned out; the relationship between the isotope abundance ratio and the sample wastage of melting and solid samples and the samples simultaneously at evaporation and decomposition are discussed in theory.

根据这三条假设建立了样品原子数的微分方程及边界条件，推导出了不同扩散系数的样品原子数的理论公式，从理论上讨论了熔融态、固态样品以及蒸发分解同时发生的样品同位素丰度比与样品消耗量间的关系。

The proteins and enzymes in saliva sample were removed by centrifugation and filtration of the mixture of acetonitrile and saliva sample.

将等体积的乙腈和唾液混合，然后通过离心和过滤的方法除去唾液样本中的蛋白质和酶。

The method has been used to determine Phthalic esters in drinking water and seawater sample. 3. Single drop microextraction, followed by gas chromatography with flame ionization detection has been applied to determine Formaldehyde, Acetaldehyde and Acraldehyde in water based on 2,4-Dinitrophenylhydrazine derivatization. Extraction solvent, extraction time and stirrer speed were optimized. Optimal experimental conditions were as follows: 1.6μL toluene microdrop exposed for 30 min in a 3ml aqueous sample placed in 4ml vial and stirred at 600 rpm/min.

以2，4-二硝基苯肼衍生，单滴液相微萃取与气相色谱火焰光度检测器联用测定水样中的甲醛、乙醛、丙烯醛，考察了萃取溶剂、液滴大小、萃取时间、搅拌速度、盐效应等对该方法的影响，并对影响液相微萃取的各种因素进行了系统的阐述，确定了该体系的最佳实验条件，实现了甲醛、乙醛、丙烯醛的提取和富集。

This research shall be obtain that ocean-sand motor shall have more compressive strength early, but later strength shall descend, by means of non-standard sand mixing sample is quite obvious. By means of 50% ocean-sand substitutes for river-sand to mix fine aggregate compressive strength early shall be risen 20%~30%; Adds slag to ocean-sand or a half of river-sand and ocean-sand to make motor test sample, Compressive strength、bending strength and tensile strength shall be according to slag additament, by means of. slag add itament substitutes for cement 40%~60% is most. But slag be able to substitute for cement is too enough, 1ater strength shall be descent.

由本研究可得知海砂拌和的水泥砂浆，其早期抗压强度较高，而晚期强度则有下降的趋势，其中以非标准砂拌和效果最为明显；若以50%海砂替代河砂做为拌和细骨材，其早期抗压强度约上升20%~30%；添加炉石於海砂或河砂、海砂各半的水泥砂浆，其抗压、抗弯及抗拉强度，会随著炉石添加量增加而增加，其中以40%~60%炉石替代量为最佳，但是炉石替代量过高，晚期强度会下降；在相同水灰比状况下以海砂拌和水泥砂浆做比较，以非标准砂拌和有较高的抗压强度，其强度约比标准砂高10%左右。

When existing liquid, the groove sample has biggest friction and the pit sample has biggest adhesive force.

有液体时，水平摩擦力是凹槽型的最大，垂直吸附力是凹坑型的最大。

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。