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Much of the gas in the disk of the Circinus spiral is concentrated in two specific rings -- a larger one of diameter 1,300 light-years, which has already been observed by ground-based telescopes, and a previously unseen ring of diameter 260 light-years.

在圆规座的漩涡星系中的大部分气体都与两个具体的"环"有密切的联系。那个较大的,直径大约有1,300光年,它已经被地基望远镜观测到了。而先前,我们没有观测到的那个小"环",直径大约有260光年。

Longitudinal and correlated data are commonly modeled with generalized linear mixed models which contain both fixed and random effects. The source of the random effect may come from the genetic heredity, familial aggregation, or environmental heterogeneity. The inference of its variance component is usually difficult due to the dimension of its covariance matrix and the complexity of the likelihood function.

在生物医学统计中常接触到具有相关性的资料,这些相关性可能是基因、环境、重复测量或是时间所造成的;在这一类型的研究中,我们通常不只对治疗的效用有兴趣,观测值的变异以及观测值之间的相关性亦可能是我们所关注的量,这些变异或相关形式都可以被称为变异数成份。

The observational and calculated results are well matched. The calculated mean diameter, mean square-root diameter, mean cube -root diameter and liquid water content are all well matched with the observational results; In the paper two examples have been analyzed by using the seeding region data and the possible affecting region data in leeward region. It is found that F-100, 2dc, and 2dp's particle concentrations increase in leeward region, but rising extent is different, which is likely to be due to difference of seeding effect time.

拟合值和观测值吻合的较好,计算出的平均直径、均方根直径、均立方根直径和粒子浓度与观测值也比较吻合;本文对两组个例的催化影响区域及可能采集到相应值的下风方区域进行了分析,催化下风向影响区的F-100、2DC、2DP的粒子浓度比背景值都有所增加,但是增加的幅度不同,应该是催化响应时间的原因。

Three RNAi target sites (named as Abil1, Abil2, Abil3) targeting the E3B1 (NCBI: NM-024397), an identified target sites and positive control GAPDH-A were selected. The pGenesil-1 eukaryotic expression vectors with the neoR mark and GFP green fluorescent mark were selected to construct E3B1 RNAi plasmid. The effect of RNAi targeting various sites on E3B1 genes expression was evaluated by testing the transfection efficiency with fluorescence microscope and western blot. The most effective siRNA in inhibiting E3B1 genes were screened. The most effective siRNA in inhibiting E3B1 genes screened and used to transfect the neuronal cells. After that, the inhibitor of axon growth was added and the axon growth was observed. Result: The siRNA expressing plasmids targeting the E3B1 were constructed successfully.

选择针对E3B1(NCBI: NM-024397)RNAi的3个靶位点Abil1、Abil2、Abil3和1个不针对任何mRNA的RNAi靶位点以及甘油醛-3-磷酸脱氢酶,用带有neoR选择标志和GFP绿色荧光标志的真核表达载体pGenesil-1构建E3B1 RNAi质粒,分别转染培养的神经元,在荧光显微镜下观测转染率,经G418筛选得到单一的转染细胞,并用Western blot法检测各转染组神经元E3B1蛋白的表达情况,选出具有最佳抑制效应的siRNA转染神经元,加入轴突生长抑制物,观测轴突生长情况。

I believe that mathematical reality lies outside us, that our function is to discover or observe it, and that the theorems which we prove, and which we describe grandiloquently as our "creations," are simply the notes of our observations.

我认为,数学的存在是不以我们的意志为转移的,我们的作用是发现它或观测它,那些我们证明的和我们称之为'创造'的定理,仅仅是对我们的观测数据的注解。

A fuzzy logic system for classification of hydrometeor type based on polarimetric radar measurements is described.

根据不同相态降水粒子的散射和空间取向等特征建立了基本形式为不对称的T型函数的模糊逻辑识别的隶属函数,完善了该识别方法的流程,并利用美国KOUN雷达的观测资料,详细讨论了利用双线偏振雷达观测资料识别降水粒子相态的方法,并对其在实际业务运用中的合理性和可行性进行分析探讨。

The modified expression of the broad emission-line profiles ire derived for the outflow kinematics model of the BLR driven by the radiation pressure. Taking into account the difference between the two lines HeI λ5876 and Hβ, it is shown the fact that the observed line width of HeIλ 5876 is broader than that of Hβ cannot be explained by the popular outflow BLR model evoked by W. G. Mathews. For comparison, line profiles of the gravitational infall model and orbital disk model are also calculated; the later is in good agreement with the observations Thereupon, conclusion is reached that the gravitational infall is an important process in the real BLR gas motion.

1推导了辐射压加速宽线云团径向外流,以及引力下落和转动等BLR运动学模型的谱线轮廓表达式,并考虑到光致电离计算表明的云团本身对Hβ和HeIλ5876谱线的辐射差异,用数值方法计算了它们的谱线轮廓,发现普遍流行的辐射加速气体外流模型不能解释HeIλ5876线宽大于Hβ线宽的观测事实,而引力下落模型则可以较好地解释观测,因此我们倾向于认为、径向内流运动很可能是BLR内的发射线云团真实运动的一个重要成分。

The object of this study is to cancerous and normal cells intimacy of hematoporphyrin derivative for diagnosis and therapy cancer, fluorescence spectra of cancerous and normal cells are measured using a ultrashort pulses laser spectral technique and picosecond time-correlated single-photon counting system.

研究用于癌症诊断与治疗的光敏剂血卟啉(hematoporphyrin derivative, HPD)对人体癌细胞与正常细胞的亲和性,采用超短脉冲激光光谱技术和皮秒时间相关单光子计数系统,测量经血卟啉培养的活体癌细胞与正常细胞的荧光光谱,观测到癌细胞样品在创645nm处具有特有的光谱谱峰;测量不同浓度血卟啉荧光光谱,观测到随着血卟啉浓度的逐渐增大,在645nm处出现的光谱峰也随之显著增强。

Using simulations, we found the best geometry of the collimator is the one with a rectangle aperture and all of them are placed in two groups with an orthogonal orientation, which will have good resolution and sensitivity, and also be easy to manufacture. The rectangle aperture gives good imaging accuracy along the short side, and wide viewing along the long side. The orthogonal orientation for collimators will allow us to observe the source and the background simultaneously.

通过模拟发现,综合考虑了对强源成像的分辨率以及对弱源的灵敏度,以及加工的容易程度,论文提出了最优的准直器设计方案是用长方形准直器,并且将所有准直器分成两组,垂直摆放,一方面可以约束两个方向上的成像质量,同时具有较高的成像分辨率和定位精度,并且非常利于定点观测时的源和本底同时观测。

First, in order to verify the correct of this retrieval month, by using the data of three-dimensional wind field, raininess field and temperature field that are output by MM5 numerical simulation, we climate the radial velocity field and echo intention field in the in-phase observation area of Dual-Doppler radar, then, on the base of the upwards retrieval theory and using the radial velocity field and echo intention field in the in-phase observation area of Dual-Doppler radar, we retrieve the atmospheric three-dimensional wind field.

首先,为检验此种反演方法的可靠性,我们使用MM5数值模式输出的三维风场、雨强场、温度场等数据,分别模拟生成两部雷达同步观测区的径向速度场和回波强度场,然后根据以上的反演理论利用模拟的双多普勒天气雷达观测到的径向速度场和回波强度场反演出大气三维风场。

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She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了,但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场,你等着挨绳子吧!

Several theories about reigniting and extinguishing of the arc have been refered.

本文综合考虑了几种电弧重燃和熄灭理论。