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Studied present measuring methods" advantages and disadvantages, and presented the necessity and importance of researching propellant transient heat transfer.2.according to 130 and aeronautic 90 rocket projectiles" structure, analysed and acquired physical and mathematical models for propellant transient heat transfer, also designed propellant temperature field simulation units for test.3.acquired discrete transient heat balance equation and temperature calculation program, and gave contrasting curves between experimental temperature values and program calculating temperature values as well as maximum errors and average square root errors between them.4.by programs based on the first class boundary condition, worked out temperature distribution in propellant temperature field simulation units at different time, analysed temperature field distribution law and main elements affecting heat transfer, acquired propellant mass weighted average temperature and one at the half position of propellant maximum thickness as well as maximum errors and average square root errors between them.5.established transient heat transfer mathematical model and temperature calculation program for the third class boundary condition, drew contrasting curves between temperature experimental values and calculation values and gave maximum errors and average square root errors between them, got temperature distribution in the simulation unit at different time and main elements affecting heat conduction, figured out propellant mass weighted average temperature and one at the half position of propellant maximum thickness as well as maximum errors and average square root errors between them.
分析了现有测试方法的优缺点,提出了研究推进剂瞬态导热的必要性和重要性。 2。根据130和航90两种火箭弹的结构,分析得到了推进剂传热的物理模型和数学模型,设计了推进剂温度场模拟实验装置。 3。得到了离散形式的瞬态热平衡方程和温度场计算程序,给出了实验温度与程序计算温度值的对比曲线及其最大偏差与均方差。 4。利用程序求出了第一类边界条件下、不同时刻推进剂温度场模拟装置中的温度分布,分析了温度场的分布规律和影响传热的主要因素,求出了推进剂质量加权平均温度和最大肉厚1/2处的温度时间曲线并给出了两者之间的最大偏差与均方差。 5。建立了第三类边界条件下的瞬态导热数学模型和温度计算程序,求出了温度实测值与计算值的对比曲线并给出了两者之间的最大偏差与均方差,得到了不同时刻温度场模拟装置的温度分布与影响导热的主要因素,求出了推进剂质量加权平均温度和最大肉厚1/2处温度及两者之间的最大偏差与均方差,讨论并确定了能代表130和航90推进剂温度的特征点的位置。
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4Based on a fact that the price formula of Asian options can be transformed into that of vanilla European option when the time to maturity is less than or equal to the length of average, we skillfully obtain the analytical price formula for the option on the minimum or the maximum of two geometric average prices and generalize it to obtain the price formula of several average prices for the first time. We also apply the method of [121], which approximates the arithmetic average by the geometric average, to the pricing of opitons on the minimum or the maximum of two arithmetic average prices to obtain Its approximated price formula. Numerical results show that the approximated price is relatively accurate when the riskless interest rate is large or the option is in the money and the volatility of two underlying assets are high and its accuracy is a little reduced but still good when the dividends are considered. However, it is hardly affected by the sampling number.
我们基于观察到的一个事实即当离到期时间小于或等于平均期间时亚洲期权的价格可变换成普通的欧式期权的价格,从而巧妙地得到了两个几何平均价格的最小或最大值期权价格的解析公式,通过简单地推广,首次得到了多个几何平均时的价格公式;将[121]用于算术平均亚洲期权的定价方法推广到两个算术平均价格的最小或最大值期权,从而得到它的渐进公式,数值结果表明:渐进价格的准确性在无风险利率较大或期权为实值且两标的资产的波动率较小时较好,抽样的个数对它没有影响,但考虑红利时它稍有下降但仍较好。
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RESULTS: The average dose of venlafaxine was (196±s 48) mgd^(-1), the average effective time was (8±3) d, and the effective rate was 68%. The average dose of mirtazapine was (32±11) mgd^(-1), the average effective time was (12±6) d, and the effective rate was 65%. The scores after treatment were significantly decreased in both groups. The scores of HAMA were (33±3)%(wk 1) and (50±3)%(wk 4) in venlafaxine group,(14±3)% and (31.0±2.3)% in mirtazapine group.
结果:文拉法辛组治疗剂量为(196±s 48) mgd^(-1),显效时间(8±3) d,有效率68%,米氮平组分别为(32±11) mgd^(-1)、(12±6) d、65%。2组疗效量表评定结果均较治疗前有显著下降,特别是文拉法辛组wk 1和wk 4的HAMA减分率为(33±3)%和(50±3)%,米氮平组为(14±3)%和(31.0±2.3)%,前者下降更为明显。
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The change of average size of products along the radius at the exist of reactor has also been calculated. The calculated results indicate that the residence time is longer, the average size of products is larger, but the distribution of size is narrower, tending to self-preserving distribution; when the concentrations of reactants increase, the average size of products becomes larger, but the distribution of size becomes narrower; the gradients of reactants are greater, the average size is larger; the increasing of reacting temperature will cause the size of product to be larger under same residence time. The average size of product at the exist of reactor varies along the radius, has a maxim value.
模型计算结果表明,产物粒度随停留时间的增加而增大,但粒度分布变窄,趋向自保分布;产物粒度随反应物进料浓度的增加而增大,粒度分布随进料浓度的增大而减小;反应器中反应物浓度梯度较大(相当于化学反应为快反应)时,相同停留时间下所得到的产物平均粒度增加;反应温度的增加,粒子平均粒径增加,粒度分布变窄;反应器出口处粒子平均粒径,随着与对称轴的距离的增加,有一极大值,先增加,后减小。
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The results showed: Fragilaria brevistriata had the highest average difference in temperature to respond to heavy metals, it was 0.24 ℃ that was 0.05 ℃ high more 0.19 ℃ of together average difference in temperature of eight kinds of algae to respond to heavy metals; The percent of Fragilaria brevistriata responding better to the reagents was 80% that was the highest in eight kinds of algae; The average response time of Fragilaria brevistriata responding to the reagents was 4.65 min that was low more 5.21 min of together average response time of eight kinds of algae; Fragilaria brevistriata' sensitivity was between 0.06 mgL^(-1) and 7.0 mgL^(-1), and the luminescent bacteria' sensitivity was between 0.07 mgL^(-1) and 15.3 mgL^(-1), so Fragilaria brevistriata had lower dose to respond to the heavy metals.
结果表明:平均响应温差短线脆杆藻最大,为0.24℃,高出8种藻的0.19℃总平均温差0.05℃;较好药品响应率短线脆杆藻最高,为80%;平均响应时间短线脆杆藻居中,为4.65min,低于8种藻的总平均响应时间5.21min;短线脆杆藻对重金属的灵敏度在0.06~7.0mgL^(-1)之间,发光细菌在0.07~15.3mgL^(-1)之间,表明短线脆杆藻对重金属响应的剂量低。
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Cases treated by incision and thread drawing with 1 recurred(average healing time 20.22±5.24 days); 32 cases by incision suture plus internal opening drainage with 3 recurred(average healing time 22.84±6.66 days); 34 cases by fistulectomy and primary suture with 5 recurred( average healing time 25.56 ±7.51 days);32 cases by fistulotomy with 6 recurred(average healing time 30.43±10.72 days).
结果:随访5~10个月(平均7 2个月),切开挂线术37例,复发1例,平均愈合时间(20 22±5 24)d;切缝内口引流术32例,复发3例,平均愈合时间(22 84±6 66)d;瘘管摘除缝合术34例,复发5例,平均愈合时间(25 56±7 51)d;瘘管旷置术32例,复发6例,平均愈合时间(30 43±10 72)d。
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Cases treated by incision and thread drawing with 1 recurred(average healing time 20.22±5.24 days); 32 cases by incision suture plus internal opening drainage with 3 recurred(average healing time 22.84±6.66 days); 34 cases by fistulectomy and primary suture with 5 recurred( average healing time 25.56 ±7.51 days);32 cases by fistulotomy with 6 recurred(average healing time 30.43±10.72 days).conclusion:low complex anal fistula usually can be treated by incision suture plus interal opening drainage or fistulectomy and primary suture, and high complex anal fistula by incision and thread drawing or fistulotomy.
结果:随访5~10个月(平均7 2个月),切开挂线术37例,复发1例,平均愈合时间(20 22±5 24)d;切缝内口引流术32例,复发3例,平均愈合时间(22 84±6 66)d;瘘管摘除缝合术34例,复发5例,平均愈合时间(25 56±7 51)d;瘘管旷置术32例,复发6例,平均愈合时间(30 43±10 72)d。结论:低位复杂性肛瘘多采用切缝内口引流术、瘘管摘除缝合术;高位复杂性肛瘘多采用切开挂线术、瘘管旷置术。
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Specific for, the service level of Hotel3 is best, its are average the service level that serve time is 3 minutes of;hotel2 about only next, its are average the service standard that serve time is 8.7 minutes of;hotel1 about is the wrongest, its are average serve time is 14 minutes about unexpectedly.
具体来说,hotel3的服务水平最好,其平均服务时间仅约为3.0分钟;hotel2的服务水平其次,其平均服务时间约为8.7分钟;hotel1的服务水平最差,其平均服务时间竟约为14.0分钟。
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Abstract] objective to assess the efficacy and safety of transurethral resection of prostatewith plasmakinetic technique and to improve the qualities of pkrp.methods the data of 273 patients with benign prostatic hyperplasiawere retrospectively studied baseing on the mastering of pkrp.the average maximum urinary flow rate,the average residual urinary volumeand the average international prostate symptom score were analysed.results pkrp was successfully performed on 273 patients.intraoperative blood transfusion was performed in 6 cases,no obturator nerve reflex,transurethral resection syndrome,permanent urinary incontinence occurred and no death cases occurred.the follow-up time was 2~26 months with an average of 5.63 months,postoperative average qmax increased to 15.9 ml/s,and ruv decreased to 16.0 ml/s and the average ipss was 9.compared with those of preoperation,the differences were significant.conclusion pkrp has superior tissue cutting function and hemostasis.it is suggested that transurethral bipolar plasmakinetic resection of prostate be effective and safe.
目的 探讨经尿道双极等离子前列腺切除术的安全性与有效性,提高pkrp质量。方法回顾性分析273例良性前列腺增生患者pkrp资料,比较手术前后最大尿流率、膀胱剩余尿量及国际前列腺症状评分。结果 273例手术均顺利完成,术中输血6例,无闭孔神经反射、永久性尿失禁、经尿道电切综合征及死亡病例,随访2~26个月,平均5.63个月,qmax平均增至15.9 ml/s,ruv平均降至16.0 ml,ipss平均9分。与术前相比,各项指标均有明显改善。结论 pkrp具有良好的组织切割功能及可靠的止血作用,治疗bph安全有效。
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Considering Saturn and Jupiter's transit, this is better than average time for business and related matters, feels Ganesha.
智慧神认为,由于土星和木星的运行,这是一个处理商业相关的事务的较好时机。
- 推荐网络例句
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But we don't care about Battlegrounds.
但我们并不在乎沙场中的显露。
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Ah! don't mention it, the butcher's shop is a horror.
啊!不用提了。提到肉,真是糟透了。
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Tristan, I have nowhere to send this letter and no reason to believe you wish to receive it.
Tristan ,我不知道把这信寄到哪里,也不知道你是否想收到它。