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In high energy X-ray radiography system,the especial conditions will prick up this affection.

尤其是在使用高能的X光进行辐射照相时，特殊的照相条件使X光源面积对于系统空间分辨率的影响更为突出。

However, this usefulness of GaN for optoelectronic devices seens to be limited by the fact that the defficulty in obtaining p-type material is to grow crystals by admixing GaP to GaN. As will known, GaP with n- or p-type conductivity can be easily obtained by suitable doping. Thus, it might be possible to get n- and p-type GaP_(1-x)N_x or GaAa_(1-xN_x crystals above some critical P content of the alloy system.

把两种或两种以上材料组合起来实现优异性能材料的方法是一种经常使用并行之有效的方法，本论文就是对GaP、GaAs与GaN形成合金系GaP_(1-x)N_x和GaAs_(1-x)N_x进行基础性研究的结果，人们预测这种合金系的禁带宽度应在磷化镓的2.261eV(或砷化镓的1.43eV)到氮化镓的3.39eV之间，如果能制成上述合金系则是很有意义的，它是很有希望的蓝色发光材料。

Then GaN nanostructured thin films comprised of regular hexagonal crystal grains have been successfully synthesized by ammoniating Ga2O3 films at the temperature of 850℃ for 15 rain in a quartz tube. X -ray diffraction reveals that the synthesized GaN is of a hexagonal wurtzite structure with lattice constants a =0.318 nm and c =0.518 nm.

然后将硅基Ga2O3置于管武石英炉中，在850℃的氨化温度下氨化15min后，成功制备出GaN薄膜，该薄膜由正六边形的晶粒组成。X射线衍射表明GaN具有六方纤锌矿结构，晶格常数为a=0.318nm和c=0.518nm.X射线光电子能谱的测试确定了样品中Ga-N键的形成，并且Ga和N的化学计量比为1：1。

It emits a magnificent amount of X-ray, which is used to reveal the atom structures.

它是目前世界上最大的X光机，因为在电子在曲线运动时会放出x光。它被用来揭示原子的结构

In this paper, propagation and amplification of X-ray laser produced by irradiating the curvature target is described by using a simplified model.

介绍了在泵浦激光辐照弯曲靶情况下X射线激光的生成放大过程，依照London理论建立了简化的弯曲等离子体模型，并通过简化模型研究了X射线激光在弯曲等离子体中的传播和增益过程，给出了光线传播的简化解析方程。

Greener, smaller and more rugged, the fit-PC2 measuring at only 115 x 101 x 27 mm is officially the smallest PC in the world market today.

绿色，更小，更坚固的（在一个持久的铝的情况下），在装修的PC2测量仅为115 x 101 × 27毫米，最小的个人电脑正式在当今世界市场。

objective to evaluate efficacy of extracorporeal shock wave lithotripsyfor treating ureteral stones in situ,investigate the cause of higher re-treatment rate.methods total of 687 patients with ureteral stone were received eswl between january 2000 and december 2004,included 455 male(66.2%) and 232 female(33.8%) patients,6 cases have bilateral ureteral calculi,12 cases have unilateral multiple calculi.hence,together 709 ureteral calculi were treated.patients upper ureteral calculi were treated in the supine position,for lower ureteral calculi patients were turned prone.to reduce eswl-induced renal trauma and pain,using lower energy source,adjusted power setting from 9.8 to 13.2kv,limited 1500 shock wavs per one session.no auxiliary procedure were used before eswl.the stone size was measured as the surface area of stone length by stone width on x-ray film.the interval between two treatment sessions was two weeks.results of 709 ureteral calculi,the overall stone free rate was 97.3%(690 calculi),re-treatment rate was 34.1%(292 calculi).according to the performed treatment sessions,one session 467 calculi,the mean stone size 37.27mm2,stone free rate 65.4%(464 calculi).two sessions 138 calculi,the mean stone size 62.48mm2,stone free rate 18.4%(131calculi).three sessions 52 calculi,the mean stone size 79.60mm2,stone free rate 7.1%(50calculi).four sessions 19 calculi,the mean stone size 101.63mm2,stone free rate 2.4%(17calculi).fivesessions 33 calculi,the mean stone size 119.33mm2,stone free rate 3.9%(28 calculi).overall 19 cases(2.7%)turned to other treatment modalities.of 335 upper ureteral calculi,303 achieved stone free (95.8%),re-treatment rate was 38.5%(129 calculi).of 374 lower ureteral calculi,369 achieved stone free(98.7%),re-treatment rate was 30.2%(113 calculi).the re-treatment rate of upper ureteral calculi was higher than lower ureteral calculi(p＜0.05,χ2=5.40).the difference of stone-free rate between upper and lower ureteral calculi was no significant(p＞0.05,χ2=0.15).conclusion eswl should be considered first line therapy for ureteral stone still.stone burden are the main variable of higher re-treatment rate,upper ureteral stone may moving with respiring during eswl.so efficinet shock wave was decreared,re-treatment rate become higher.

目的 评估体外震波碎石治疗输尿管结石的疗效，探讨再治疗率高的原因及输尿管结石的治疗选择。方法回顾2000年1月～2004年12月间eswl治疗输尿管结石的临床资料687例，男455例（66.2%），女232例（33.8%），平均年龄46.6岁（15～83岁）。有双侧输尿管结石6例，单侧多发性输尿管结石12例（4颗1例，3颗2例，2颗9例），共计输尿管结石709颗（含透光结石13颗）。应用上海爱申公司生产的desunit6030型碎石机，c臂x线球管做结石定位。上段输尿管结石（肾盂输尿管交界处至骶髂关节上缘）取仰卧位，下段输尿管结石（骶髂关节上缘下至输尿管口）取俯卧位。为减少eswl引起的肾损伤和疼痛，应用较低的能量，震波发生器电压从9.8～13.2kv，震波频率1.5s。每次治疗设定为1500次震波。治疗后3天摄腹部平片或b超，以后每隔7日重复检查。假如结石未碎或有残留结石最长径＞3mm以上，再次eswl，两次治疗的间隔时间为两周。结石的大小用x线片上的表面积（mm2表示。结果 709颗输尿管结石总的治愈率为97.3%（690颗），再治疗率34.1%（242颗）。其中一次治疗467颗，平均结石大小37.27mm2，治愈464颗（65.4%），3颗改治疗；两次治疗138颗，平均结石大小62.48mm2，治愈131颗（18.5%），7颗改治疗；第1和第2次治疗治愈率（1个月治愈率）为83.8%。3次治疗52颗，平均结石大小79.60mm2，治愈50颗（7.1%），2颗改治疗；4次治疗19颗，平均结石大小101.63mm2，治愈17颗（2.4%），2颗改治疗；5次及5次以上治疗33颗，平均结石大小119.33mm2，治愈28颗（3.9%），5颗改治疗。总计19颗（2.7%）结石改变治疗方式。上段输尿管结石335颗，治愈321颗（95.8%），再治疗129颗（38.5%）。下段输尿管结石374颗，治愈369颗（98.7%），再治疗113颗（30.2%）。经χ2检验，上、下段输尿管结石的再治疗率差异有显著性（χ2=5.40，p＜0.05），治愈率差异无显著性（χ2=0.15，p＞0.05）。不良反应：血压升高13例（1.9%），震波区域疼痛26例（3.8%），震波进入处皮肤点状淤血33例（4.8%），肉眼血尿128例（18.6%），均于第2、3天自行消失。结论 eswl目前仍是输尿管结石的第一线治疗，结石的大小是再治疗率高的主要因素。结石的位置有影响，上段输尿管结石可随呼吸移动，有效震波次数减少，再治疗率比下段输尿管结石高。eswl前注重病例筛选可降低再治疗率。

The results show that nano-crystalline NiAl intermetallic compound can be synthesized by MA taking elemental powders of NixAl100-x(x＝25,30,40,50) as green reactants. Supersaturating solid solution NiAl intermetallic compound can be synthesized by MA using nonstoichiometric Ni-Al powders, and the synthesis mechanism is combustion reaction which includes forced solid solution based on atomic diffusion.

研究表明：NixAl100-x四种成分的元素粉末通过机械合金化方法均制备出纳米晶NiAl金属间化合物粉末；非化学计量配比成分的Ni-Al粉末通过机械合金化合成NiAl过饱和固溶合金，其机械合金化合成机理为含有以原子扩散为基础的强制固溶的燃烧合成反应。

You are transliterating C or Perl code to Python, and, to keep close to the original's structure, you need an expression's result to be both assigned and tested as in if(x=foo( or while(x=foo in such other languages.

你正在把c或者perl代码翻译到python，并且，保持原始的结构。你需要一个即是赋值也是测试的表达式结果（在那样的语言里，象这样if(x=foo或者while

BRAND: I work at X company and that's a big strong part of their identity.

主持人：我在X公司工作，X公司是我对自己定义的一个重要成分。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。