系数环

Due to the coupling of every Zernike circular polynomial in the annular field, the SEIDEL coefficients solved by wavefront fitting with circular polynomial for annular pupils with big central obscuration would have larger errors.

由于Zernike圆多项式各项在环域上的交叉耦合，对于具有大中心遮拦的环孔径波面采用圆多项式拟合求解SEIDEL像差系数存在较大误差。

The drape coefficient of ring spun fabric was higher the that of Sirospun fabric with the same blending ratio as the proportion of the soybean protein fiber was low and middle, and Sirospun fabric was higher than ring spun fabric asthe proportion of the soybean fiber was high.

大豆蛋白纤维含量在中、低比例时，相同混纺比的Sirospun织物的平均摩擦系数大于环锭织物；当大豆蛋白纤维含量在高比例时，环锭织物大于Sirospun织物。

We study cuspidal loop bifurcation、 Homoclinic or double Homoclinic bifurcation、 Hopf bifurcation and obtain the necessary conditions to generate limit cycles by using the coefficients of the expansion of the first Melnikov function.

利用一阶Melnikov函数的展开式的系数研究了尖点环分支、同宿分支、双同宿分支和Hopf分支，并给出了产生极限环的充分条件。

The flow regime in downcomer can be divided into two kinds: cross flow injection and impingement. Cross flow injection only takes place under low injection flow rate in dowcomer flow. The investigation on flow regime and heat transfer in RPV under PTS is for the first time in China.

在国内本实验是第一个研究下降环腔内的流动与传热，在国际上，象这样同时进行了流动可视化，常温常压下传热和高温高压下传热的实验也不多，特别是针对下降环腔内对流换热系数的研究，在公开文献中还没有相类似的实验。

As investigated, the shape of the fruit was mainly rotundity, and the color of the fruit were red, black, yellow, mauve. Variation coefficient of mineral elements, which revealed wider variation range and rich genetic diversity. Among them, Fe, the content and the variation coefficient of which was the highest(2.12 mg·100g-1 and 26.99％), it has large potential for futher selection. Ripe fruit of 12 wild myrobalan plum seedlings were analyzed using head space-solid phase microextraction and gas chromatography-mass spectrometry. The results showed considerable genetic variations in these aspects: The total content of volatile components, the classes and contents of each compounds classes, the segregation ratio, and content of main components. There were 83 compounds in total belonging to 6 classes detected in 12 wild myrobalan plum seedlings, including esters, alcohols, ketones, aldehydes, heterocycle and Hydrocarbons. Among them, Formic acid, hexyl ester, the content of which was the highest(4.33 μg·g-1),was important character impact odors.

结果表明，①新疆野生樱桃李实生株系的果实形状主要为圆形，少数为椭圆形、卵圆形、卵形和宽卵形，果实颜色有黄色、红色、紫红色和黑色等4种类型，野生樱桃李果实纵径、横径、单果重、果形指数以及可溶性固形物含量均存在一定程度的变异，遗传多样性较为丰富，其中以单果重的变异系数最大(9.13 %)；②新疆野生樱桃李实生株系果肉组织的Zn、Ca、Mg、Mn、Fe及Cu等6种矿质元素含量变异丰富，其中以Fe元素的含量（平均值为2.12 mg·100g-1）和变异系数（26.99％）最高，进一步筛选高铁性状单株的潜力很大；③从新疆野生樱桃李12个实生株系中共鉴定出醇类、醛类、酯类、酮类、烃类及杂环类等6类83种挥发性化合物，各实生株系挥发性化合物总含量、挥发性化合物种类及其含量以及主要挥发性化合物分离比率与含量等存在广泛的遗传变异，遗传多样性较为丰富，其中以甲酸己酯含量最高（平均值为4.33 μg·g-1），是野生樱桃李果实香气形成的重要特征性化合物。

ABSTRACT: Random amplified polymorphic DNA was used in analysing the relationship among twenty-six speices of Amanita from Mangshan, Hunan. Of 40 primers, 6 ones generated reproducible RAPD profiles, and each one produced 1-10 bands. Two primers (OPG15 and OPH04) could differentiate 26 species of Amanita by its RAPD profiles. The similarity coefficients obtained from profiles generated by six primers among Amanita were about 20-60%. A dendrogram was constructed using average linkage clustering for clustering analysis. It indicated that there were two groups in 26 species and some species with ring and membranous volva clustered a group which coincided with morphological classification.

本文对采自湖南莽山的26种鹅膏菌属真菌进行了随机扩增多态性DNA分析，40个随机引物中筛选出扩增效果较好的6个引物，每个引物能产生1～10条DNA条带，获得的RAPD谱带清晰并呈现多态性OPG15、OPH04两个引物扩增的RAPD谱带能将26种鹅膏菌完全区分开来，通过6个引物的RAPD分析获得的平均相似性系数表明种与种之间的相关系数在20―60%之间，平均链锁聚类分析可将26种鹅膏菌分为二大类，且一些具菌环和苞状菌托的种类聚在一起，与形态分类基本相吻合。

Secondary production of major groups of macrozoobenthos in Lake Donghu was estimated from field data. The number of generaion, P/B coefficients and production of 9 dominant species were as follows: B. aeruginosa, univoltine, 91. 56g WW/m〓. yr, 0.64; S. lacustre, univoltine, 43. 02g WW/m〓. yr, 3. 55; B. sowerbyi, univoltine, 11. 39g WW/m〓. yr, 4. 15; L. hoffmesteri, trivoltine, 7. 09 g WW/m〓. yr, 11. 9; P. choreus, bivoltine, 5. 03g WW/m〓. yr, 10.33; Ch. plumosus, bivoltine, 3. 37g WW/m〓. yr, 9. 10; T. chinensis, univoltine, 3. 76g WW/m〓. yr, 4. 49; T. akamusi, univoltine, 44. 60g WW/m〓. yr, 4. 60; Clinotanypus sugiyamai, univoltine, 0.48g WW/m〓.

较系统地研究了东湖底栖动物九种优势种的生活史、P／B系数和生产量，其结果如下：铜锈环棱螺：一年一代，生产量为91.56g WW／m〓。yr，P／B系数0.64；湖球蚬：一年一代，43.02g WW／m〓。yr，3.55；苏氏尾鳃蚓：一年一代，11.39g WW／m〓。yr，4.15；霍甫水丝蚓：一年三代，7.09 g WW／m〓。yr，11.9；花翅前突摇蚊：一年两代，5.03g WW／m〓。yr，10.33；羽摇蚊：一年二代，3.37g WW／m〓。yr，9.10；中国长足摇蚊：一年一代，3.76g WW／m〓。yr，4.49；大红德永摇蚊：一年一代，44.60gWW／m〓。yr，4.60；褐斑菱跗摇蚊：一年一代，0.48g WW／m〓。yr，7.59。

The basic parameters of cement are elastic modulus, poisson's ratio and the thickness of cement;they do have impact on the coefficient of pressure transmission of surrounding rock and the coefficient of inflation pressure transmission of casing

水泥环的基本参数弹性模量、泊松比和厚度对围压压力传递系数和套管压力传递系数都有影响

The uptake rate and equilibrium time of organochlorine pesticides were obtained during the laboratory experiment. All the equilibrium time are 594 hours except that δ-BHC's is 234 hours and both p, p'-DDE and o, p-DDT's are 70 hours. Uptake rates of α-BHC, hexachlorobenzene,β-BHC,γ-BHC,δ-BHC, heptachlor, aldrin, heptachlor epoxide, p, p'-DDE, dieldrin, endrin, p, p'-DDD, o, p-DDT and p, p'-DDT are 0.061, 0.071, 0.098, 0.066, 0.033, 0.014, 0.007, 0.062, 0.108, 0.052, 0.029, 0.032, 0.061mL/h, respectively.

得出了有机氯农药在水相和半透膜之间分配的平衡时间和富集系数，平衡时间除δ-BHC为234h和p，p'-DDE、o，p-DDT为70h外，其余组分均为594h；α-BHC、六氯苯、β-BHC、γ-BHC、δ-BHC、七氯、艾氏剂、七氯环氧、p，p'-DDE、狄氏剂、异狄氏剂、p，p'-DDD、o，p'-DDT、p，p'-DDT富集系数分别为：0.061、0.071、0.098、0.066、0.033、0.014、0.007、0.062、0.108、0.052、0.029、0.032、0.061mL/h。

A computer simulation based on strong-weak model shows good agreement with the linear theory. The linear theory of the ion trapping instability caused by ions in equilibrium is also introduced in this paper.

包括不稳定性的增长率与中性化系数的关系、阈值与中性化系数的关系、束流的相干频率漂移和展宽、离子在空间的分布和尺寸、离子动态丢失的机制以及离子在储存环内积累的极限。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。