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There are a lot of investigations on arithmetic functions: and , where is Euler totient function and o is the sum of divisors of n.

设φ表示n的欧拉函数，σ表示n的所有正因子和，ω表示n的不同素因子的个数。

There has been a lot of investigations on arithmetic functions σ and φ,where φ is Euler totient function and σ is the sum of divisors of n.

设φ表示n的欧拉函数，σ表示n的所有正因子和，ω表示n的不同素因子的个数。

Sixty SD rats were assigned randomly to the transplantation group (n=30) and the control (n=30). All animals were subjected to focal brain contusion following the Feeney's method. Then the neural stem cells derived from newborn Wistar rats were transplanted into the traumatically injured brains.

60只SD大鼠随机分配到实验组(n=30)和对照组(n=30)，制作脑损伤模型，实验组将Wistar大鼠来源的神经干细胞移植到损伤灶，对照组注射等量生理盐水。

In a pot experiment with spring wheat and buckwheat as test crops and with thiophosphric triamide and dicyandiamide as test inhibitors, the transformation, regulation and residual effect of 〓N-labelled urea were studied.

采用〓N标记的尿素，以N-丁基硫代磷酰三胺和双氰胺为供试抑制剂，春小麦和荞麦分别为供试作物进行尿素N转化的调节及其残效盆栽试验。

The dispersion behavior of Si〓N〓 nanopowders in N-N-dimethylformamide was studied, and triethanolamine was selected as a dispersant.

对激光法纳米Si〓N〓在二甲基甲酰胺中的分散行为进行了研究并找到了合适的分散剂三乙醇胺。

A silver ion selective electrode was prepared and characterized with trimethylene bis (N-ethyl-N-phenyldithiocarbamate) as ionophore.

制备并考察了以双（N-乙基－N-苯基氨基二硫代甲酸）1，3-丙二醇酯为载体的银离子选择电极的性能。

First, N'-(4-aminophenyl)-N'-4-(5-phenyl-1,3,4-oxadiazol-2-ylphenylbenzene-1,4-diamine was prepared and polymerization was carried out by direct polycondensation with a series of dianhydrides to obtain polyimides containig triphenylamine units in the main chain and 1,3,4-oxadiazole moieties as pendent group.

首先合成新型双胺N'-(4-aminophenyl)-N'-4-(5-phenyl-1，3，4-oxadiazol-2-ylphenylbenzene-1，4-diamine后，与一系的芳香族二酐进聚缩合反应，可制得一系列三苯胺为主链且1，3，4-恶二唑为侧链的聚醯亚胺。

The structural and electronic analysis indicates that the GeCNN (5) possesses a conjugate triply bonded structure |Ge≡C—N≡N|.

几何和电子结构分析表明， GeCNN (5)具有共轭三键结构： Ge≡C—N≡N：。

The results indicated that the growth of 3-year-old Prunus salicina was significantly higher than that of the other species, such as 139.1% and 153.7% higher than Toona sinensis and Juglans regia in height growth, respectively. The maximum percentage of DBH more than 1.0 cm was 91.9% for P. salicina. Next were 49.5% and 48.8% for Ulmus pumila and Pteroceltis tatarinowii, respectively. The contents of total N, total P and total K ranged from 1.36% to 2.52% in the leaves of testing species. The highest content of total N and total P was found in the leaves of Catalpa bungei, while the highest content of total K was observed in P. saltcina leaves. The results indicated that P. salicina, P. tatarinowii, U. pumila had well adaptability on the Karst area both in the growth status and the improvement to the soil with the fallen leaf.

结果表明：(1)3年生冰脆李的生长量明显优于其他树种，其高生长比香椿、核桃分别大139.1%和153.7%；植株胸径大于等于1.0 cm株数的百分比以冰脆李最高达到91.9%，其次是榆树和青檀，分别是49.5%和48.8%；(2)8个树种落叶的全N、全P和全K的总含量变动为1.36%~2.52%，其中全N、全P含量以滇楸最高，全K含量以冰脆李最大；(3)从各树种落叶前后各元素含量及其转移情况看，冰脆李、青檀表现出对大部分营养元素具有较高的循环利用养分或保持养分的能力，而香椿及刺槐相对较弱。

CO conversion of 80.27%, 78.41% and 61.14% and selectivity to C(superscript + subscript 5) of 88.54%, 88.57% and 77.95%, respectively, were obtained for Fischer-Tropsch synthesis under n(H2): n=2.0, 483 K, 1.5 MPa and 800h^(-1) over uncalcined catalyst, those calcined at 673 K and 923 K.

在原料气n(H2)：n=2.0、483K、1.5MPa和800h^(-1)条件下，未焙烧、673K和923K焙烧的催化剂上进行F-T合成反应，CO的转化率分别为80.27%、78.41%和61.14%，重质烃的选择性C(上标+下标 5)分别为88.54%、88.57%和77.95%。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。