筛法

The computation of the square root of a huge algebraic number is the last stage of the N7FS.

代数平方根的计算是数域筛法的一个必要环节。

It is greatly efficient, because this overcomes the shortcoming of Eratosthenes algorism that need compare every natural number in the given range, This algorism can acquire all prime numbers between 1 and any given natural number m This article also has given the complexity of the algorism, and even if sift in the algorism were different, it will be...

这避免了传统Eratosthenes 筛法需要比较每个数的缺点，极大地提高了算法效率。该算法能用于求1至任意自然数m之间的所有素数。同时还给出了该算法的最多比较次数公式，即使用不同的筛子利用该公式也容易求得其最大比较次数。

Prime number ; distribution of prime ; divide exacdy ; sifting algorism of Eratosthenes ; algorism ; dynamic sifting algorism ; static sift algorism

素数；素数分布；整除； Eratosthenes筛法；算法；动态筛法；静态筛法

The property of being a prime is called primality. Prime numbers are of fundamental importance in number theory.

20世纪的数学家们研究哥德巴赫猜想所采用的主要方法，是筛法、圆法、密率法和三角和估计等等高深的数学方法。

The practical problems in the granulometric analysis method—the water sedimentation analysis method and the dry sieve analysis method,are analyzed,and an improved water sieve analysis method is developed in this paper.

文章分析了目前粘性土颗粒分析的主要方法——静水沉降法和干筛法，指出其存在的问题。

METHODS: Adjust the previous dosage of menthol and ethanol and the preparation method was shifted to wet - sifting from trituration.

改变原处方中薄荷脑、乙醇用量，配制方法由研磨法改为湿筛法。

Partition sieve; Integer classification sieve; Ethereal sieve; Goldbach problem; Problem of twin primes

分割筛法；整数分类筛法；轻筛法；Goldbach问题；孪生素数问题

Sifting function partition by integer sort; Selberg's sieve; Goldbach problem; Problem of twin primes.

筛函数按整数类别分割；Selberg筛法；Goldbach问题；孪生素数问题。

To further explore tillage practices for improving soil structure, the effect of different tillage practices on the structure and organic carbon of tilth soils were investigated using routine method (Wet-sieving, Potassium dichromate volumetry and Core-cutting sampling).

为了寻求能够提高土壤结构稳定性的耕作模式，在陇中黄土高原半干旱区连续7年的定位试验研究基础上，采用常规分析方法(湿筛法、重铬酸钾容量法、环刀法)，研究了不同耕作方式对耕层土壤结构性能及有机碳含量的影响。

Ninety seven spores or sporocarps of VAMF were wet sieved from the rhizosphere soil of mycorrhized pteridophytes, from which 25 VAMF species which belonged to the genera of Acaulospora, Gigaspora, Glomus, Sclerocystis and Scutellospora respectively were identified, and the taxonomic characters of the 25 species were described. The Glomus fungi were the dominant VAMF in the rhizosphere soil of pteridophytes, they took up 44% in the identified 25 VAMF (11 species belong to Glomus); the fungi in Acaulospora and Sclerocystis in the next place, they took up 24% and 16% respectively in the identified VAMF; the fungi in the other genera took up 16%. In terms of the relationships of pteridophytes and the VAMF isolated from their rhizosphere soil, there was no specifity between the VAMF and their host.

从具有VA菌根的蕨类植物对应的根际土壤中用湿筛法筛取了97份VA菌根真菌的孢子或孢子果，从中鉴定出了分属于无醒囊霉属、巨孢囊霉属、球囊霉属、硬囊霉属和盾孢囊霉属的VA菌根真菌25种，并对这25种真菌的分类学特征进行了描述；球囊霉属真菌是蕨类植物根际土壤中的优势类群，已鉴定的25种真菌中，有11种属球囊霉属真菌，占44%，其次是无梗囊霉属和硬囊霉属真菌，分别占24%和16%，其他属的VA菌根真菌占16%，从分离鉴定的蕨类植物根际土壤中的VA菌根真菌与蕨类植物的关系看，VA菌根真菌与蕨类植物之间无明显的专一性。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐