查询词典 precipitation

Then, acid precipitation method and chilled alcohol precipitation method were applied to extract sericin.

采用酸析法和低温乙醇沉淀法对粗粉末中的丝胶进行提取，结果表明：低温乙醇沉淀法的提取率较高，采用体积分数为75%的乙醇溶液提取率达到64%。

The results showed that TPS was of the best accuracy of three methods for temperature, precipitation and relative humidity, significantly for air temperature and precipitation. The difference of the accuracy of three interpolation methods for the aestival relative humidity was not significant.

结果表明：薄盘光滑样条函数法的插值精度最优，特别是温度和降水的效果尤其明显；对于三种插值方法，相对湿度的插值精度在夏季差异不明显。

Methods: from prepation of crude drug as start, study the technology of extract and defat with L9 (3~4) orthogonal test. With EtOH extraction and water sed, alkali washing, EtOAC extraction as main methods of eliminate dopant. Finally with alky AlzO3 chromatographic column, rich and gain anticancer active site. The maximum response was achieved at a 40 min extracting time with 10 times volume 90% EtOH added to the sample for the first time and 30 min for the second time. Adding 10 times water will produce precipitation; Place the precipitation into 6 times petroleum benzin to de-fat at 60℃.

云南红豆杉中抗癌活性物制备工艺研究方法：利用正交设计试验L9(3~4)确定原料药提取工艺为：10倍量90％乙醇提取两次，第一次40分钟，第二次30分钟；醇提液用10倍量水沉；沉淀加6倍量石油醚40℃脱脂；用1mol／L的NaOH溶液碱洗，除去酸性杂质；以碱性氧化铝柱，以环己烷／丙酮为洗脱溶剂，在环己烷-丙酮(6：4)段富集到所需活性部位，洗脱剂用量为3VB。

Two methods for the determination of magnesium in rare earth-magnesium middle alloy by EDTA titrimetry, i. e. oxalic acid precipitation and ammonium hydroxide precipitation, were studied.

研究了分别采用草酸和氢氧化铵沉淀分离稀土镁中间合金中的稀土，EDTA络合滴定法快速测定电解稀土镁中间合金中镁的两种方法。

By the budgetary estimate of the water and heat conditions at the glacial equilibrium line and the water balance of lakes in the area of the West Kunlun Mountains during the late stadial of the Last Glaciation. before the summer mean temperature decreased by 1.5 C, the annal mean precipitation was 10-20% more than that of the present. As the summer mean temperature lowering was over 1. 5 C, the precipitation was decreased and the negtive of the lake water balance appeared.

文中还根据对西昆仑山区冰川零平衡线处水热状况及湖泊水量平衡状况的推算，指出末次盛冰期中，在夏季温度降低1-1.5℃以前，其年降水量应大于现代值，增加量大约在10-20％左右；在夏季温度降低值大于1-1.5℃以后，其降水减少，湖泊水量平衡出现负值，这与冰川、湖泊变化的地质记录所反映的早期冷湿、中期冷干气候条件相符。

The conclusion through correlation analysis on annual ring grow quantity and precipitation and temperature is that the precipitation in local area is the main factor which affect forest growth quantity.

从年轮生长量与降水量温度相关分析得出：该地区降水量是影响森林生长量的主导因子。

The results show: the strongest bond is the Al-Al bond in the segregated cell without containing vacancy, where the Al atomic covalence radius is greater than that of Li atom in the cell; while the strongest bond is the Al-Li bond in the segregated cell containing vacancy, and the Al atomic covalence radius in the cell is less than that of Li atom. Since the difference of electronagativity between the Al and Li atoms is obvious, it is inclined to formed the Al-Li segregated cell of short range order structure in the condition of vacancy present. The short range order structure containing vacancy is probably the embryo or precursor structure of the metastable phase δ′(Al3Li). Because the strongest covalent bond in the Al-Li-vacancy segregated cell in alloy formed in quenching is the main strength reason for supersaturated solid solution of alloy. The bond net of succeeding precipitation of δ′(Al3Li) has the picture of anisotropic Al-Al bonding and the bond intensity enhanced. Since the δ′(Al3Li) is coherence with matrix, the bond net strength is enhanced by the precipitation of δ′(Al3Li) and so strengthen the alloy.

计算结果表明：不包含空位的偏聚晶胞的键络最强键为Al—Al键，其中Al原子的共价半径较Li原子的共价半径要大；而含空位的偏聚晶胞的最强键为Al—Li键， Al原子的共价半径要比Li原子的共价半径要小；在空位存在的情况下，由于Al原子与Li原子的电负性相差明显，促使Al和Li原子结合，倾向形成Al-Li短程序结构偏聚区，这种含空位的短程序结构很可能就是δ′(Al3Li)亚稳相的前兆结构和生长胚胎；由于Al-Li-空位有序偏聚晶胞的Al—Li键络比基体键络要强许多，因此，淬火过程中合金生成的Al-Li-空位偏聚晶胞对合金过饱和固溶体起主要强化作用；后续析出的δ′(Al3Li)亚稳相键络各项异性显著，键络强度明显提高；由于Al3Li与基体共格，其大量均匀弥散析出起到提升基体整体键络强度，同样对合金产生强化作用。

The results show that the RIEMS can simulate the pattem and seasonal cycle of standard deviation of surface temperature and precipitation. Meanwhile,RIEMS is unable to simulate inter-annual variability of precipitation in April and July, although it does pretty well for January and October precipitation.

结果表明，模式能够较好地模拟出温度和降水的标准差的空间分布和不同区域平均标准差的年变化，同时，对降水的年际变率检验发现，模式能够模拟出一月和十月降水的年际变率，而不能模拟出四月和七月降水的年际变率。

Effect of decomposition conditions on the ratio of seeded decomposition and properties of precipitation products from sodium aluminate solutions with the very light boehmite seed prepared from the hydrothermal homogeneous precipitation between aluminum sulfate and urea, was studied. Mechanism of the very light boehmite precipitation process was also analyzed.

以硫酸铝和尿素水热均相沉淀合成的低密度－水软铝石为晶种，研究分解条件对溶液分解率和分解产物性质的影响，还对从铝酸钠溶液析出低密度－水软铝石的过程进行了初步分析。

Effect of decomposition conditions on the ratio of seeded decomposition and properties of precipitation products from sodium aluminate solutions with the very light boehmite seed prepared from the hydrothermal homogeneous precipitation between aluminum sulfate and urea, was studied. Mechanism of the very light boehmite precipitation process was also analyzed.

摘 要：以硫酸铝和尿素水热均相沉淀合成的低密度一水软铝石为晶种，研究分解条件对溶液分解率和分解产物性质的影响，还对从铝酸钠溶液析出低密度一水软铝石的过程进行了初步分析。

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。