决定因子

The presence of leg pain is an independent predictor of a patient's choice for operative over nonoperative care.

是否存在腿痛是患者决定手术或非手术治疗的一个独立判断因子。

Photoperiodic control of flowering in plant decides by genetic factor and environment.

高等植物的成花诱导过程由自身遗传因子和外界环境因素两方面决定。

Phragmites australis, by TWINSPAN, and the community characteristics of each association were described. The result of the ordination for 41 samples by DCA revealed the relationships between the pattern of these communities and certain environmental factors, especially the moisture in soil.

样方的DCA排序结果较好地反映了植物群丛类型与环境因子，尤其是土壤含水量之间的关系。28种DCA排序结果较好地反映了群丛的生境特征，优势种的分布格局在很大程度上决定着植物群落的分布格局。

The mRNA level of per gene under high temperature was higher than that under low temperature when the larval and pupal stages were under the same photoperiod.

温度和光照是昆虫近日节律基因表达的授时因子，也是影响家蚕滞育的决定因素。

The results showed that annual average temperature was the most important factor determining the occurrence of all species except for Quercus mongolica and Populus davidiana.

结果表明，除了山杨和蒙古栎之外，年均温是决定其它树种存在与否的重要因子。

Four thin-layer drying models were investigated for the description of FIR-assisted freeze-drying characteristics. The models were exponential model, Page model, diffusion model, and approximation of the diffusion model. Tests were conducted using a three-level, three-factor (drying temperature, distance between sample and FIR heater, and sample thickness) design, and quadratic polynomial analyses were performed to relate the drying parameters of thin-layer drying model. The performance of these thin-layer drying models was evaluated by comparing the coefficient of correlation (R2), the sum of squares, and the RMSE amongst four models. Drying parameter K of the Page model gave the best results in describing freeze-drying with FIR of Tylose and sweet potato.

运用四种薄层乾燥模型（指数、Page、渗透模型及近似渗透模型）研究远红外线冷冻乾燥之乾燥特性，实验采用三阶层、三因子（远红外线加热器设定温度、远红外线加热器至样品表面之距离及样品之厚度）的实验设计，对於薄层乾燥模型的乾燥参数以二次多项式函数表示之，乾燥参数之二次多项式函数的最适性判断主要是藉由决定系数、模式缺乏适合性及均方根误差等值的比较而加以评估，以Tylose及甘薯样品而言，其中四种薄层乾燥模型的乾燥参数以Page模型之K值的结果为最佳。

The general feature of the plastic deformation is similar in both charging or uncharging hydrogen specimens.

发现：氢的存在并不改变在Ⅰ型或混合型载荷作用下，裂纹尖端的塑性变形特征，即在主裂纹前端，应变呈不对称分布，裂纹尖端Schmid因子决定了条带状局部形变带的轴线方向。

Six factors determining the motion of vortices are discussed.

并讨论了决定涡旋运动的六个基本因子。

Moreover, temperature and salinity were the essential factors to determine the seasonal changes of zooplanktonic abundance, particular the salinity which is the key factor to affect the horizontal distribution and abundance of zooplankton.

通过进一步线性回归分析表明，温度和盐度是影响浮游动物丰度季节变化的重要因素，其中盐度是决定浮游动物丰度水平变化的关键因子。

Pinus yunnanensis is one of the main afforesting tree species in Yunnan Province. Two key factors of determining the growth of P.

种源和栽培条件是决定云南松Pinus yunnanensis生长优劣的关键因子。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。