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The laminar flamelet model in combination with joint probability density function transport equation of mixture fraction and turbulence frequency is used to simulate fluctuating behavior of radiative source term in turbulent jet diffusion flames of hydrogen.

采用κ-ε湍流模型、标量联合的概率密度函数输运方程和层流火焰面模型相结合,模拟氢气自由扩散火焰中辐射源项湍流脉动特征。给出了主燃区内辐射源项湍流脉动的频率图。辐射源项的样本点分布集中,大约95%以上的样本落在其系综的±3倍方差以内,频谱图为单峰

Both of the ESD were proportional to kVp 2.2 to kVp 2.5 and were linear proportion to mAs. Inverse square law exists in the relationship of focus-film distance, FFD, and ESD. The impacts of field size and patient thickness to ESD are negligible. Optimized operating condition is chosen to improve the diagnosis rate and to reduce the patient dose. The ESD, 0.12±0.06 mGy, performing the optimized operating condition of chest x-ray examinations, is less than both values of reference doses recommended by NRPB and IAEA.

研究结果发现,入射表面剂量随操作条件而变,以相同的条件照射,三相位X光机所造成表面剂量大约是单相位X光机的1.9倍;入射表面剂量与kVp的2.2至2.5次方成比例,与mAs约成线性正比,与焦斑至底片距离的关系大约符合平方反比定律;照野面积及身体厚度虽会影响表面剂量的大小,但其程度远低於kVp及mAs的影响。

The parameters for blanching and green- protecting of Opuntia Milpa Alta juice were studiedusing single factor and orthogonal experiment. The results showed that 1.5 times boiling blanching for 1.5min, and the centretemperature reached 93 ℃,not only inactivated the peroxidase, but also increased thecontents of total polyphenolics and soluble solid in the Opuntia Milpa Alta juice, and a well green- pro-tecting effect could be obtained by adding 100 μg/g Zn2+, 40 μg/g Cu2+,0.075 %Vc,0.025 % citricacidin blanc...

通过单因素实验和正交实验,对米邦塔仙人掌制备绿色蔬菜汁饮料的热烫护绿工艺条件进行了研究,结果表明:采用1.5倍体积沸水热烫1.5min,中心温度达93℃,可使过氧化物酶的活力基本丧失,也可提高仙人掌汁中总酚和可溶性固形物的含量,同时在热烫护绿液中加100μg/g的Zn2+、40μg/g的Cu2+、0.075%Vc、0.025%柠檬酸,护色20min,护绿效果好。

Wheat straw powder amendment induced one times and more emissions of N 2O and CH 4 than no its application, and hence, even only from the standpoint of diminishing soil source greenhouse gases emission, applying unmatured composted organic materials with urea is an inappropriate fertilization system.

不论是N2O还是CH4的排放总量,施麦秸粉的都比未施的高出1倍和更多。因此,单从土壤源温室气体排放的角度看,将未腐熟的有机物料与尿素共施,并不是一种适宜的施肥制度。

By stretching the song to about 50 times slower than normal, one can enter a rich world of odd tones, microscopic vibrations and little glissandi not belonging to the actual melody, but being a natural part of the human voice and the Chinese tradition of singing.

随着歌曲旋律被放慢到比正常速度慢五十倍,这时就进入了一个丰富的单音世界,显微镜摆动着,小的滑音并不属于真实的旋律,却是人声和中国民族唱法组成的自然的声部。

Methods: A randomized, single blind controlled clinical design was used to accomplish the series clinical trials included 123 cases. The troop of gatifloxation injection with sodium chloride included 20 cases in gatifloxation group and 23 cases in ciprofloxation group; The troop of gatifloxation injection with glucose included 21 cases in gatifloxation group and 19 cases in levofloxacin group; The troop of gatifloxation pivoxil included 19 cases in gatifloxation group and 21 cases in ciprofloxation group. The antibacterial activity of clinical isolates were detected by scrips which contain gatifloxation(5ug/L), levofloxacin (5ug/L), ciprofloxation (5ug/L), spafloxation(5ug/L), cefotaxime(30ug/L), penicillin(10U/L) respectively. The MICs of sixkinds of antibiotics were detected by 2-fold agar dilution method. Result: The common data of patients in the two groups of 3 troops were similiar.

采用区组分层均衡随机单盲试验设计,分别完成甲磺酸加替沙星氯化钠注射液组试验药20例及对照药23例、甲磺酸加替沙星葡萄糖注射液组试验药21例及对照药19例、甲磺酸加替沙星片剂组试验药19例及对照药21例共123例感染患者的临床试验;用K-B法测定临床分离致病菌对加替沙星(5ug/L)、左氧氟沙星(5ug/L)、环丙沙星(5ug/L)、司帕沙星(5ug/L)、头孢噻肟(30ug/L)、青霉素(10U/L)纸片的敏感性,再用按美国国家实验室标准委员会(National Committee for Clinical Laboratory Standards,NCCLS)推荐的琼脂平皿对倍稀释法测定临床分离菌株对加替沙星、左氧氟沙星、环丙沙星、司帕沙星、头孢噻肟、青霉素的最低抑菌浓度(Minimum Inhibitory Concentration,MIC)以了解其体外抗菌活性。

The pumpkin seed oil has higher content VA , VE, carotene before pressing by suitable heat treatment.

通过研究发现,冷榨前,适当的加热处理有利于提高南瓜籽油中VA、VE、胡萝卜素的含量,其中,单螺旋榨油机制取的南瓜籽油中VE的含量是双螺旋榨油机的3倍。

Theoretical models are developed to predict the ultimate up-lift bearing capacity of single-screw anchor in sand, and the calculation formula of them is given.

当两个锚片的间距较大时,其上拔极限承载力与两个单锚片的极限承载力之和相接近,两种计算模式的分界间距是4倍锚片直径。

This gun had a single-chamber muzzle brake from the 75mm KwK 40 L/43 gun and was mounted in a turret that featured a drum cupola that bulged the turret on the left side.

这种坦克炮有一个单室炮口制退器源于75毫米43倍径的KwK40坦克炮上。该坦克炮安放在一个炮塔里,该炮塔的一个特点是有一个鼓型的突起在炮塔的左边。

From more than 2,000 yuan to 8,000 yuan, these "astronomical" New Year's fares would massage yiwu make people speechless performances, the same show more than a few dozen or several hundred dollars theater fare changed several times, but never a lack of pay for those.

从2000多元到8000多元,这些&天价&贺岁演出的票价令老百姓咋舌,同样的演出比剧场里几十或是几百元的票价翻了几十倍,但却从不缺乏买单者。

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

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