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In order to improve the power quality of distribution network system, one of the most effective methods is reactive power compensation. In this paper, the Distribution Static Synchronous Compensator for reactive power compensation was studied, and then the digital controller based on One-cycle control was designed. The waveforms of experimental device based on DSTATCOM of one-cycle control were given in this paper. It can be seen from the results that the fluctuation of DC capacitor voltage is lower, the dynamic response speed of DSTATCOM providing or absorbing reactive power is fast, and the accuracy of steady-state compensation can achieve the requirements of reactive power compensation in engineering basically
为了提高配电网系统的电能质量,对无功功率进行精确补偿是非常有效的方法之一;本文研究了配电网静止同步补偿器用于无功补偿,并设计了单周控制的数字控制器;文中给出了基于单周控制的DSTATCOM无功补偿试验装置工作过程中的波形曲线,从试验结果可见,本文设计的单周控制DSTATCOM无功补偿装置的直流侧电容电压在工作过程中波动较小,装置发出或者吸收无功功率的动态响应速度较快,稳态补偿精度基本能够达到工程中无功补偿的要求。
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The results were analyzed with the statistical software package spss10.0.results ①between two groups,there was no significant difference about the affection of age,sex and the destribution and location of aneurism on prognosis outcome(p<0.05).however,the grading of hunt hess and fisher in group a(gos>3) showed significantly lower than in group b(gos≤3),(p<0.001);② there was no significant difference in the frequency of heart rate, st elevation, st depression,t wave inversion,u wave inversion and ventricular arrhythmia(p>0.05).the frequency of abnormal q wave, supraventricular arrhythmia and the ecg scores in group a showed significantly lower than in group b (p<0.05,p<0.001);③the ecg scores was the most powerful multivariate risk stratified(ecg ≥5 vs ecg<5; p=0.002,or=0.010,95%ci 0.001~0.173).conclusion the ecg score, a new and simple method of semi quantification, was a powerful risk predictor for patients with sah.
应用spss10.0 统计包分析结果。结果①在年龄、性别、动脉瘤生长部位影响动脉瘤性sah预后方面,两组病例无明显差异(p>0.05)。而按sah后hunt hess分级和fisher分级,gos>3病例的分级要明显低于gos≤3的病例的分级(p<0.01);②两组在心率、st段抬高、st段压低、t波倒置、u波倒置、室性心律失常出现的频率无明显差异(p>0.05);在异常q波和室上性心律失常出现频率及心电图评分方面,gos>3的组别明显低于对照组(p<0.05,p<0.001);③心电图评分是sah患者预后最显著影响的变量(p=0.002,or=0.010,95%的可信区间0.001~0.173)。结论心电图评分作为一种新型、简便的半定量方法,能有效的预测蛛网膜下腔出血病人的预后。关键词:心电图;预后;评分;蛛网膜下腔出血
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Results:There were significant difference in score of SCCS between army men group and norm.
结果 :心理训练前,SCCS的不和谐分低于常模,灵活性分高于常模,刻板性与常模无显著性差异;实验组和对照组的SCCS、EPQ、SCSQ及SCL -90评定结果均无显著性差异。
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Result patient of wet wart of acuteness of 79 gestation vulva, nurse through psychology, the mood is good 75, state of mind is stable liquid nitrogen of 4; classics is refrigerant after be being treated jointly with MEBO, leather damage achieves Zhou Yu of 1 week of ~2 to close, the 3rd month after art of apparent scar; is not being had after art is not had add excrescence newly, continue to follow visit to 6 months, have a relapse without, produce undesirable reaction without, stop without a patient gravid.
结果79例妊娠期外阴尖锐湿疣病人,通过心理护理,情绪良好75例,心态平稳4例;经液氮冷冻和MEBO联合治疗后,皮损创面1周~2周愈合,术后无明显瘢痕;术后第3个月无新增赘生物,继续随访至6个月,无一例复发,无一例发生不良反应,无一例病人终止妊娠。
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Accuracy between two groups was calculated byχ~2 test.Calculate the average effective radiation dose of the 30 patients.Results In group A,seventeen patients underwent both DSCT coronary angiography and SCAG,among 255 segments of 17 patients,105 lesion sites of 70 segments were diagnosed stenosis or obstruction,of them,95 lesion sites were confirmed by SCAG.The accuracy of DSCTCA was 90.48%.The agreement of two methods have a high agreement(Kappa =0.853).In group B,13 patients underwent both DSCT coronary angiography and SCAG,among 195 segments of 13 patients,73 lesion sites of 57 segments were diagnosed stenosis or obstruction, of them,65 lesion sites were confirmed by SCAG.The accuracy of DSCTCA was 89.04%.The agreement of two methods have a high agreement(Kappa =0.835). There was no significant difference(χ~2=0.098,p>0.05) between the accuracy of two groups.The effective radiation dose of 30 patients was 3.67±0.43 mSv.Conclusion Compared with SCAG,prospectively ECG-gated transverse DSCT is a valuable examination to detect and diagnose coronary artery disease with a low dose coronary angiography.The accuracy of the DSCT is approximate to the SCAG.There was no significant difference between the accuracy of two groups.
结果200例患者均成功完成了适应性前瞻性心电门控双源CT冠状动脉血管成像;30例同期行SCAG检查的患者,A组17例:HR≤75 bpm,可评价冠状动脉节段255个,70个冠状动脉节段有105处不同程度的狭窄,95处狭窄程度与金标准SCAG相符,其阳性诊断准确率为90.48%;2种方法的诊断结果得到了较高的一致性(Kappa值=0.853)。B组13例;HR≥91 bpm,可评价冠状动脉节段195个,57个冠状动脉节段有73处不同程度的狭窄,65处狭窄程度与SCAG相符,其阳性诊断准确率为89.04%;2种方法的诊断结果得到了较高的一致性(Kappa值=0.835)。2个心率组间的诊断准确率无明显统计学差异(x~2=0.098,p>0.05)。30例患者的平均有效辐射剂量为3.67±0.43 mSv结论适应性前瞻性心电门控双源CT冠状动脉成像是一种有效减低辐射剂量的扫描方式,其诊断准确率与金标准SCAG相比得到较高的一致性,且高、低2个心率组间诊断准确率无明显统计学差异。
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In this paper, in the process of modified isochronal test , abnormal phenomenon that transient test production is greater than absolute unresisting flow rate during producing test in low permeability reservoir Changqing oilfield.
针对长庆低渗透气藏进行修正等时试井过程中出现试采瞬时测试产量大于绝对无阻流量的异常现象,在明确气井瞬时测试产量与其绝对无阻流量概念的基础上,通过对气井绝对无阻流量获得过程及气井绝对无阻流量计算结果影响因素的分析,在理论上证实了气井瞬时测试产量大于其绝对无阻流量的可能性,从而解释了现场测试过程中出现的特殊现象。
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For the examination of Multispectral radiation thermometry with first-order linear emissivity model:(1) the best MRT examined wavelength range for unoxidized aluminum alloys is from 3 m to 4 m;(2) unoxidized samples provide better temperature prediction than oxidized samples;(3) if the emissivity model can well represent the real emissivity behaviors, the more accurate inferred temperature can be achieved.
应用多光谱辐射测温法搭配一阶线性放射率模组於温度推测:(1)应用於推测无氧化试件表面温度之波段的选择以3 m到4 m的结果最好;(2)应用於推测无氧化试件表面温度的结果比推测有氧化试件表面温度的结果来的好;(3)当放射率模组越能模拟铝合金表面放射率行为,则所推测温度误差将越小。
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There were no significant facilitating effects to the retention of signaled information in the overuse of text signals condition, but there were in the selective use of text signals condition. Experiment 3, in which 2 small experiments contained, studied the effects of reader-based factors. Experiment 3a examined the effects of the familarity to the text topics and the readers' reading levels. Experiment 3b explored the effects of cognitive style and the intention to use the text signals. The results were as the follows: There were no significant difference between the signaled and unsignaled conditions in the circumstance of high familarity to the text topics, but there were significant differences between them in the circumstances of lower familarity to the text topics. There were no significant differences between the signaled and unsignaled conditions for the field-independent participants, but there were for the field-dependent participants. All the participants with different reading levels were helped by the text signals.
实验3 对不同主体因素条件下文章标记效应进行了研究,分2个分实验,实验3a以高中二年级学生为被试,研究了文章主题熟悉程度与阅读水平对文章标记效应的影响,实验3b以初中二年级学生为被试,探索了读者不同的认知方式与标记利用的意向对文章标记效应的影响,实验3结果发现,读者的阅读水平、对文章主题的熟悉程度、认知方式和利用标记意向等因素影响着文章标记效应,在文章主题熟悉的条件下,有无文章标记无显著差异,但在主题不熟悉条件下,有文章标记的效果显著优于无标记的效果;对场独立被试而言,有无标记无显著差异,但对场依存被试来说,有标记条件显著优于无标记条件;文章标记对不同阅读水平被试都有显著促进效应;文章标记利用意向对场独立与场依存被试都有显著促进效应。
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The flowfield and performance of a centrifugal compressor was predicted and analysed, which was composed of a Krain's impeller and two types of vaneless diffuser specially: one was constant area vaneless diffuser and the other was the straight-wall. The results show that the efficiency of the straight-wall vaneless diffuser is obviously lower than that of the constant area, and a separate flow occurs nearby the exit of the centrifugal impeller with the straight-wall diffuser. However, the type of vaneless diffuser has little influence on the aerodynamics performance of the centrifugal impeller. Finally, it is suggested that the constant-area vaneless diffuser should be selected as the downstream extended area of the centrifugal impeller during the prediction for the centrifugal impeller.
对Krain叶轮后带等面积与直壁两种形式的无叶扩压器离心压缩机内部流场进行了计算与分析,结果表明:直壁型无叶扩压器离心压缩机的效率低于等面积无叶扩压器离心压缩机的效率;直壁型无叶扩压器使得叶轮出口的流动出现分离;扩压器的形式对离心叶轮的整体气动性能影响并不大;在进行离心叶轮数值研究时,叶轮后的延伸区最好采用等面积无叶扩压器,以尽量减小无叶扩压器所引起的计算误差。
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Among people who do exercise regularly, those--elder, non-smoker, perceiving unhealthy, no income or low level of income and practicing exercise often with partner—were more likely to carry on the effective fat-reducing exercise. This study identified the groups of overweight and obesity and their association with practicing exercise habit and health fitness.
结果显示龄较高、男性、教育程较高、无吸菸、有患慢性病、无烦恼、最近星期无身体适影响生活作息、工作家事耗体、收入在60000 元以上者及收入在19999 元以下者,其进运动与的可能性较高;高龄、无吸菸、自认健康好、无收入或低收入与经常有运动同伴者,其进有效减肥运动的可能性较高。
- 推荐网络例句
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I will endeavour to find you some assistance.
我尽力帮你找人帮忙。
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At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.
起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像,后来回台湾,甚至去年在北京,居然也四处看见她的海报,才惊讶她的魅力之大。
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Ah may dee:You are chinese living in a democratic country.
你是居住在民主国家的中国人吧。