查询词典 D

A 3-D face model is constructed by the imaging theory and spherical harmonics, combining with the principle of 3-D projection and PCA.

根据3-D数据的优势，利用图像成像原理和球面调和函数理论，结合3-D投影原理和PCA技术建立了一个3-D人脸模型。

Based on them, we calculated precisely some enegy levels of P-wave and D-wave of a helium atom, presented and proved the general interdimensional degeneracies for a quantum N-body system, derived the general spherical spinor functions and the exact solution to the Dirac equation for the hydrogen atom, and proved uniformly the Levinson theorem for the Dirac equation in D-dimensions.

在此基础上，我们精确计算了氦原子P波和D波若干较低能级，建立和证明了量子N体系统不同维数状态间最普遍的简并，推导出任意 D 维空间广义球旋函数和Dirac方程氢原子的精确解，统一地提出和证明了任意 D维空间Dirac方程Levinson定理的一般形式。

And this causes a frequency change Δf. The resonant point tracing algorithm describes how to detect Δf. So it can introduce a feedback frequencydifference -Δf through a closed loop to realize the resonant state o In the digitaldetection scenario, using staircase wave to replace saw tooth wave, it can overcome a lot of shortcomings in the analog system. The character of the staircase wave affects the detection precision directly. This thesis analyzes a high precision scenario producing a staircase waveform in detail. It can reduce the number of the bits in D/A converter greatly. This thesis proposes another method to improve the detection precision in case that the A/D converter has comparatively little number of bits, while this method will not increase the cost of the system greatly.

在谐振式光纤陀螺中，环形谐振腔的旋转使得谐振腔的谐振频率发生了变化，从而产生了一个与旋转速度成正比的频率变化值△f，谐振点跟踪算法描述了如何检测出△f，从而可以通过闭环在系统中引入反馈频差-△f，实现光路的谐振状态；在数字闭环检测方案中，用阶梯波作为反馈信号来代替锯齿波，可以克服原来模拟系统中锯齿波的很多缺点，阶梯波的性能直接影响着系统的测量精度，本论文详细分析了一种高精度阶梯波生成方案，使得所需D／A的位数大大降低；本文还分析了A／D转换器对系统测量精度的影响，提出了一种A／D转换器位数较少的情况下提高系统测量精度的措施，同时又不会增加太多的系统成本。

For sha d ing on a piece, blen d s or twee d ing is often use d .

对于这样的作品，混纺或twee d ing底纹经常被使用。

We give a new 2-D graphical representation of protein sequences based on nucleotide triplet codons in the half complex plane, which has no degeneracy. Meanwhile using main characterization of complex vector: module and phase, we give a kind of numerical description of protein sequences.

利用这三个递归公式给出了RNA二级结构序列的1-D、2-D和3-D图形表示，进一步利用1-D图形表示给出了关于RNA二级结构序列频谱分析的方法。

Methods 60 female mice were randomly divided into 4 groups (n=15):Mice in normal control group received subcutaneous injection of normal saline and mice in the other 3 groups received cervicodorsal injection of D-galactose[1000 mg/(kg1·d)] for 42 d to establish subacute aging model.

60只雌性昆明种小鼠，随机分为4组(n=15)：正常对照组皮下注射生理盐水；其余3组每日颈背部皮下注射 D-半乳糖[1000 mg/] 造成小鼠衰老模型，同时各组分别灌胃生理盐水、枸杞多糖[200 mg/]、丹参酮[1 500 mg/]。42 d后，测定小鼠背部皮肤组织匀浆中超氧化物歧化酶活力、过氧化脂质代谢产物丙二醛含量和皮肤羟脯氨酸含量。

Plantlet regeneration from cotyledon of Citrullus lanatus cv. Zhangkang No. 4 was studied. The results showed that aseptic seedlings should be cultured in dark for 3d, then exposed to a photoperiod of 16/8h/d for 3d. The callus induction rate was higher in cotyledons placed facing downwards to the medium than in those facing upwards. The highest induction rate occurred in MS medium containing 6-BA (2.0mg/L), kinetin (1.0mg/L)and GA3 (1.0mg/L). The induction initiated in dark and took 7 days, while callus growth and differentiation proceeding for 7 days under 16/8h light-dark cycles. A highest rate of embryogenic callus was obtained after 3 successive subcultures.

以无子西瓜郑抗4号无菌苗子叶为外植体，进行了体细胞胚发生及植株再生的研究，结果表明，无菌苗应先进行3d暗培养，然后采取光照16h/d和黑暗8h/d培养3d；将子叶的叶面朝下放置于培养基上的愈伤组织诱导率高于叶面朝上的培养方式；子叶诱导胚性愈伤组织的最适培养基配方为MS+6-BA2.0mg/L+KT1.0mg/L+GA31.0mg/L；诱导需要在黑暗条件下启动，进行7d暗培养，而生长分化于光照16h/d和黑暗8h/d条件下培养7d；继代3次得到的胚性愈伤组织最多；最适生根培养基配方为1/2MS+IBA0.3mg/L。

CVB-D+ verapamil group:verapamil of 0.1 μmol/L was added into the bath firstly,10 minues later AP was recorded,then CVB-D of different concentrations (3×10 -8,1×10 -7,3×10 -7,1×10 -6,3×10 -6,1×10 -5)mol/L was added into the bath cumulately and AP was recorded every five minutes.

环维黄杨星D(cyclovirobuxine D ，CVB D)是从黄杨科植物小叶黄杨中提取的甾体生物碱，具有良好的抗心律失常、抗心肌缺血和强心作用，临床上广泛用于治疗心律失常、心绞痛和冠心病[1，2 ] 。

SC the neck and back of mice by D gal(120mg/kg) for 40days,SC the herbs group by D gal let them drink the concentrated two old drugs decoction for 40 dyas,and compared with the empty group,than observe the effect on the indices of the brain,dthymus,spleen,liver and kidney,the activity of SOD of serum,MDA and t...

小鼠颈背部皮下注射D 半乳糖 4 0天，中药组注射D 半乳糖同时以 6 32g/(kg·d-1 )浓缩二陈汤煎液灌胃 4 0天，并以空白组作对照，观察二陈汤对小鼠脑、胸腺、脾、肝、肾指数、自由基代谢指标血清超氧化物歧化酶、丙二醛及小鼠大脑额前页神经元超微结构的影响。

Formylation and diformylation of dithieno [2,3-b:3',2'-d] thiophene were prepared by two methods. Firstly, aromatic carbanions were prepared by 1 Br/Li exchange of bromo dithieno[2,3-b:3',2'-d]thiophene with n-BuLi in THF at low temperature; 2 deprotonation of dithieno[2,3-b:3',2'-d]thiophene with LDA.

二噻吩并[2，3-b：3'，2'-d]噻吩单醛与双醛的制备首先通过两种方法产生芳基负离子：1溴代并三噻吩在四氢呋喃中与正丁基锂发生的溴锂交换；2用LDA对二噻吩并[2，3-b：3'，2'-d]噻吩去质子化作用。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。