查询词典 accretion borer

The theory of accretion disks are important for many astrophysical phenomena, including Quasars, active galatic nucleic, X-ray binary stars, and young stellar objects. The most important branch of accretion djsk theory is the stability properties of djsks. It is widely considered that the luminosity variations of various astronomical objects are associated with the instability of accretion disk. The viscosity plays an important role in the accretion disk theory, and magnetic field exists commonly in astronomical phenomena. A more realistic analysis of the stabihty of the accretion disk should include both the radjal and azimuthal perturbations because of the strong shear of viscous flow.In this paper, according to the luminosity Variations of Various astronomical objects, we study the radial-azimuthal instability of an isothermal with magnetic field. We find that the radial and azimuthal fields B〓,B〓 are mainly responsible for enhancing the instability of the magneto-acoustic modes and non-axisymmetric modes,and that pulsational oscillations are larger in the radial than in the Z direction. The model may be useful in explaining the periodic light variation of FU orionis and. T Tauri stars.

在许多天体物理现象中，例如活动星系核，X-射线双星和年青的恒星理论中，吸积盘理论起着重要的作用，而吸积盘理论中的一个重要分支是吸积盘的不稳定性理论，普遍认为活动天体的周期，准周期光变现象与吸积盘的不稳定性有关，在吸积盘理论中，粘滞起着重要的作用，而磁场是天体物理中普遍存在的现象，对于几何薄吸积盘不稳定性分析，由于强剪切流的缘故，应该包括径向和环向扰动两个方面，本文结合天体物理中的各种周期，准周期光变现象，研究了含磁场的等温薄吸积盘的径向-环向振荡不稳定性，结果表明：磁场的径向和环向分量对磁声模和非轴对称模的不稳定性的增加起着主要的作用，且径向振荡大于轴向振荡，所得结果有利于解释FU Orionis和T Tauri Stars的周期光变现象。

Firstly the thesis made study on stress field、 displacement field、 yielding part in colluvial deposit and accretion before water accumulated and after water accumulated and made the conclusion that slope failure will take place easier in colluvial deposit than in accretion.The stability computation indicates that stability will decline either for colluvial deposit or accretion bank and decline more rapidly in colluvial deposit than accretion bank.

论文首先对崩坡积、冲洪积岸坡蓄水前后的应力场、位移场及塑性区的变化进行对比，结论为崩坡积体岸坡遇水比冲洪积体岸坡更容易发生破坏；通过对岸坡的稳定性计算，两种岸坡在蓄水后和水位骤降时的稳定性均明显降低，崩坡积体岸坡降低更为显著，且其天然稳定性较冲洪积岸坡为差。

In our country the corn borer is comprised of the Asian corn borer and the Europe corn borer.

玉米螟在我国主要有欧洲玉米螟和亚洲玉米螟，其中亚洲玉米螟在我国是优势种，发生严重，在我国各地均有分布。

The orogenic strata have following characteristics: During the subduction and intracontinental orogeny, the strata experienced dramatic tectonic migration and mixing, resulting in various tectonic features. A short sequence usually composed of tectonic slices of various origins, times, deformations and metamorphisms, and scales. The original sequence was badly destroyed. The extant fragments of orogenic belt usually took form as melanges, especially the accretion complex wedge generated in subduction zone, which is contrary to the Law of Superposition. The original location of the accretion is also contradicted with the Law of Original Horizonality, because the accretion is oblique with high degree. Marine rocks, volcanic rocks of continental margin and metamorphic rocks were well-developed in the orogenic belt, especially ultra-basic, basic rocks were wide spread and were intensely metamorphosed, accompanied by metamorphic slices returned from hundred kilometers underground with ultra-high pressure and magma movements during syn-orogeny and post-orogeny, thus formed the colorful landscapes.

造山带非史密斯地层构成具如下独特性和复杂性：造山带在俯冲碰撞和陆内造山阶段，发生过强烈的构造搬运和构造混杂，构造形迹多样化，垂直不长的地层体往往是众多不同来源、不同时代，不同变形变质程度，不同大小的各种构造岩片拼贴体，地层原始层序被严重肢解、破坏；尤以产于俯冲带的俯冲增生杂岩楔的原始形成方式与史密斯地层学的&层序叠覆律&老下新上的顺序正好相反，其混杂岩增生方式是老的&片体&在上，新的&片体&阶段性拼贴在老的&增生片体&的斜下方，这种增生片体的原始位置亦与&原始水平律&相悖，即增生片体一般保持较高角度倾斜；在岩石类型和变质程度上，造山带海相和古陆缘火山岩以及变质岩普遍发育，尤其是超基性、基性岩系分布广泛，变质作用较强，伴有从百余公里以下深部超高压变质岩片的折返和同造山期与造山后期岩浆活动，构成极为复杂的地质景观。

The planetesimals accretion s of the Earth obviously have two stages, including initial accretion and late accretion .

地球的星子吸积过程具有明显的两阶段性，即原地球吸积阶段和晚期吸积阶段，而后期的吸积过程对上地幔及地壳的化学成分不均一性的影响尤为显著。

It will take 56 to 63 days for the frist generetion of Asiatic corn borer to develop from egg to larva, pupa, and imago in Dewu region. 7. The primary imperilment period of first gemeration of Asiatic corn borer is shooting stage. And the heading stage, grain filling stage in early sowing corn and belling stage in late sowing cron is disserved by the second generation. The imperilment degree of second generation is more serious than frist generation. 8. The best way for the prevention of black cutworm is to spray on early larva and to trap and kill with poison bait in late larva.

7第一代玉米螟主要为害拔节期玉米，第二代玉米螟主要为害处于抽雄吐丝期、灌浆期的早播玉米和处于大喇叭口期的晚播玉米，第二代玉米螟对玉米的为害程度显著高于一代玉米螟；玉米螟的为害受玉米品种影响较大，自交系苏宁三号的受害程度明显高于其他各品种；植株长势对玉米螟发生为害程度有极显著影响，表现为长势好、生长旺盛的玉米受害重，长势差的玉米受害轻；海拔高低对玉米螟发生为害的影响不大。

In order to enhance its resistance to bacterial blightand lepidopteran such as leaffolder, striped stem borer and yellow stem borer etc, we intergessed Xa21 and Bt genes into the genetic background of 93-11 by backcross scheme, combining with molecular marker-assisted selection and phenotypic selection. Through three backcross and two self generations, eight families that have homozygous Xa21 and Bt genes were obtained in the BC3F3 families. Two families show higher recovery percentage of 93-11 even up to 90.59%.

为了进一步提高其对白叶枯病的抗性、同时增加其对水稻鳞翅目害虫（如稻纵卷叶螟、二化螟和三化螟等）抗性，利用常规回交育种方法和结合分子标记辅助选择将Xa21基因和Bt基因同时导入93-11中，在BC3F3家系中筛选到8个家系含纯合的Xa21基因和Bt基因，其中有两个家系与93-11比较其遗传背景的回复率很高，达到90.59%。

In addition, the primary choice of resistance to Bt of rice stem borer is conducted through artificial diets of rice stem borer.

另外，本文利用二化螟人工饲料对二化螟抗Bt品系进行了初步的选育。

But on the natural stem borer infestation condition, the improved 93-11 contained Bt gene and its hybrid was not damage by stem borer.

在自然诱发螟虫条件下，带有Bt基因的株系及其杂交种没有受到螟虫危害。

Rice stem borer; artificial diet; orthogonal design; key factors; rice stem borer resistance to Bt

二化螟；人工饲料；正交试验设计；关键因子；抗Bt品系

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。