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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.

把兩種或兩種以上材料組合起來(lái)實(shí)現(xiàn)優(yōu)異性能材料的方法是一種經(jīng)常使用并行之有效的方法日韩三级无码中文字幕视频，本論文就是對(duì)GaP日韩成人作爱在线视频观看免费播放、GaAs與GaN形成合金系GaP_(1-x)N_x和GaAs_(1-x)N_x進(jìn)行基礎(chǔ)性研究的結(jié)果欧美熟妇XXXX性潮喷，人們預(yù)測(cè)這種合金系的禁帶寬度應(yīng)在磷化鎵的2.261eV(或砷化鎵的1.43eV)到氮化鎵的3.39eV之間欧美插插影院，如果能制成上述合金系則是很有意義的亚洲黄色在线观看网站，它是很有希望的藍(lán)色發(fā)光材料国产操B在线。

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.

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

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

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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.

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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.

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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四種成分的元素粉末通過(guò)機(jī)械合金化方法均制備出納米晶NiAl金屬間化合物粉末；非化學(xué)計(jì)量配比成分的Ni-Al粉末通過(guò)機(jī)械合金化合成NiAl過(guò)飽和固溶合金色多多在线www免费观看，其機(jī)械合金化合成機(jī)理為含有以原子擴(kuò)散為基礎(chǔ)的強(qiáng)制固溶的燃燒合成反應(yīng)免费看毛片的网址。

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.

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