查询词典 natural number

The ignition and its flame spreading test system of the modular charges in the natural environment is built up, a number of ignition and its propagation methods are simulated, the characteristic parameters of the system in the natural environment are obtained.

本文针对刚性组合装药的点传火技术进行了一些基础性试验研究和理论分析，建立了自然环境下刚性组合装药的点传火试验系统，并对多种点传火方案进行了模拟试验，获得了点传火系统在自然环境下的重要性能参数。

In microevolution, it provided a number of molecular marker systems for the research of genetic variation in plant natural populations, greatly facilitating investigation of the evolutionary mechanisms under natural conditions.

它们在研究植物天然居群遗传变异的规律、揭示进化机制方面已展示了巨大潜力，这是进化生物学中最重要的研究领域之一，也是物种遗传多样性保护的理论基础。

During these years (1997-2000) in the research area of annonaceous acetogenins 5 natural products and a number of chiral-pure analogs of annonaceous acetogenins have been synthesized using sugars as the starting materials. Their high activity and selectivity against cell line of colon tumor and a relationship between activity and configuration have been found too. In the respect of inhibitor of sialidase two new methodologies for the synthesis of chiral-pure 3-deoxy-ulosonic acid using hetero-Diels-Alder reaction or asymmetric propargylation as the key reaction were developed. On the topic of anti-leukemia marine natural product clavulactone a synthetic method based on the free radical cyclization and starting from sugar has been developed. In other title of PKC inhibited agent sphingosine a new synthetic route with SN2' as the key reaction has also been disclosed.

项目期间（1997-2000）在番荔枝内酯方面从糖出发合成了五个天然产物和一批手性纯的类似物，它们对肠癌细胞有很高的活性和选择性，并与构型有关；在唾液酸酶抑制剂方面发展了二类全新手性纯高碳糖的合成方法－杂原子D－A反应或丙炔基不对称加成为关键的反应；抗白血病海洋天然产物群柱虫内酯方面研究了由糖出发和自由基环化反应的合成方法；对PKC 起抑制作用的鞘氨醇方面也开创了新的合成途径－由糖出发并以SN2'反应为关键反应。

Accordingly, the natural resources of water of average per capita of a large number of population has Chinese north the quantity is 728A square rice only, under photograph comparing, japan and natural resources of water of Thailand average per capita have a quantity to be 3380 stere.

因此，中国北方大量人口的人均水资源拥有量仅为 728A方米，相比之下，日本和泰国人均水资源拥有量为3380立方米。

Sharon Hopkins has been managing a number of natural home remedies websites which gives information on Hepatitis C Natural Ways of Treatment.

沙龙霍普金斯一直管理若干补救天然家园网站，让信息丙型肝炎的自然方式处理。

First, the ecological environment,"Fung city yuan and Egg Factory" location for local products Xiao Feng Tangxiang city, regional area of 39.7 square kilometers, of which 5,400 acres of water can be breeding in the region a mild climate, sunny, fertile land , Abundant rainfall, with the duck's natural climate and material resources, is the abundance of water birds city centre and the birthplace of farming, breeding birds Gaixiang is a pillar industry. Quanxiang the end of 2002 the number reached 420,000 duck feathers, rich in water resources and full of aquatic plants, Lo shrimp resources, to provide natural green duck feed, the duck has a long history of the formation of "a row of fruit, a pool Fish, a duck shed "three-dimensional ecological farming model," Feng city yuan and egg plant "to provide fresh, high-quality source of the eggs.

&丰城市元和蛋品分厂&土产所在地为丰城市筱塘乡，区域面积39.7平方公里，其中有可养殖水面5400亩，该地区气候温和，阳光充足，土地肥沃，雨量充沛，具备了养鸭的自然气候和物质资源，是丰城市水禽养殖的发源地和中心，水禽养殖是该乡的支柱产业。2002年底全乡养鸭数已达42万羽，丰富的水面资源中，富有水草、螺虾资源，为养鸭提供天然的绿色饲料，悠久的养鸭史形成了&一排果、一池鱼、一棚鸭&生态立体养殖模式，为&丰城市元和蛋品厂&提供新鲜、优质的蛋源。

Flex family of three pillows: Soft Pillow, fiber cotton pillows, silk, feather pillow filling and other basic material, comfortable and flexible Product; hard Pillow, the people gradually, and enjoy popular buckwheat shell filled material, mobility, and be free to shape the shape, in particular the best load bearing capacity to have a growing number of loyal followers; neutral pillow (Mid-Firm Pillow), natural Typha velvet, slightly elastic material, such as Kapok Morrison, but the natural aroma, comfortable and soft, and the support of the cervical spine in particular, see favorite moderate.

软硬度三大枕头家族：软枕，纤维棉枕、蚕丝、羽绒枕等基本填材，产品舒适而富有弹性；硬枕，国人逐步喜欢并流行的荞麦壳填材，流动性好，可自由塑造形状，尤其承托力最佳让其拥有了越来越多的忠实追随者；中性枕（Mid-Firm Pillow），天然香蒲绒，木棉花等材质弹性略逊，但天然芳香、舒适柔软，对颈椎的承托适中尤其惹人喜爱。

Composition weight factor is derived from the concept of "radix" in natural number systems, and to be the generalization of it in real number field.

组成权重因子"来源于自然计数制中"基数的概念，是它在实数域上的推广。

This paper studies the curvilinear integral ∮ L[xn-1yn-1]/[x2n+k2y2n]where L is a sectioned smooth and no multiple points closed curve, n is some natural number, k is some positive number.

本文研究曲线积分x~(n-1y~(n-1)/x~(2n+k~2y~(2n)，其中L是公段光滑无重点的闭曲线，n为某一自然数，k为某一正数。首先利用极坐标变换将曲线积分化简，然后对n、L不同情况给出相应结果

These sets are interesting subsets of natural number in combinatorial number theory, ergodic theory and topological group.

这些集合是人们在组合数论、遍历理论以及拓扑群中感兴趣的重要的自然数子集。

The United Kingdom has pledged to provide technical assistance to the peacekeeping effort in Darfur, including airlifting supplies and equipment to assist the African peacekeepers.

英国承诺为达佛的維和努力提供技术帮助，包括提供非洲的維和部队空运补給和裝备。

Results: The level of ET-1mRNA in placental villus was significantly higher in pre-eclamptic women than that in control group.

结果：妊高征组患者胎盘绒毛组织ET-1 mRNA的表达较正常妊娠组明显增高。