排序方式: 共有16条查询结果,搜索用时 109 毫秒
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以三(二亚苄基丙酮)二钯(Pd2(dba)3)为催化剂,三甲苯基磷(P(o-tol)3)为配体,4,3’-十二烷基-2,2’-联二噻吩(M1)和2,8-二溴-5-(2-己基癸基)苯并三噻吩(M2)为单体,采用Stille交叉偶联反应,合成了基于苯并三噻吩和联二噻吩单元的共轭聚合物(PBTT)。采用热重分析、紫外-可见分光光度计及电化学分析分别研究了聚合物PBTT的热性能、光学性能和电化学性能。结果表明:聚合物PBTT具有优异的热稳定性和低的最高占有轨道能级(HOMO);聚合物薄膜最大吸收峰位于469 nm,光学能带隙为2.10 eV;将聚合物与 [6,6]-苯基-C61-丁酸甲酯(PC61BM)共混材料作为活性层制作了本体异质结构太阳能电池器件,在模拟太阳光源AM 1.5 G 100 mW/cm2照射条件下,该器件获得了高达1.00 V的开路电压,初步的能量转化效率为0.43%。 相似文献
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目的:设计满足保障便携要求的光伏独立充电系统。方法:WYD2000型手术灯为例,使用非晶硅薄膜太阳能组件改装其外部电源系统,根据光伏电池的等效电路模型计算其输出,利用最大功率跟踪原理对太阳能控制器进行仿真,研究太阳能充电技术应用的可行性。结果:使用ASCENTSOLAR的薄膜太阳能电池板组成的2X8阵列,形成最大电压39V最大电流2.08A的光伏发电系统能够很好的满足手术灯的供电需求。结论:光伏发电系统具有便携性,隐蔽性,不受地域限制等优点。在没有商品供电的时候,可以作为补充电力,提供低电压供电,使得卫生装备能够在艰苦的条件下发挥更大的作用。 相似文献
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AIM:To investigate the role of 64-slice computed tomography(CT) in portal vein cavernous transformation to determine surgical strategy.METHODS:The site of lesions and extent of collateral circulation in 12 pediatric cases of cavernous transformation of the portal vein with surgical treatment were analyzed.RESULTS:Eleven of 12 children had esophageal varices and were treated with lower esophageal and gastric devascularization and splenectomy,and the other case was only treated with splenectomy.There were eig... 相似文献
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针对局部阴影情况下,光伏输出曲线非线性和多峰值的特性,从概率论的角度出发,提出基于蒙特卡洛的光伏多峰值最大功率跟踪控制算法。对光伏输出曲线及均匀分布进行分析并构建概率模型。然后根据蒙特卡洛算法的基本原理,对模型特定区域内的随机变量进行统计以确定近似最大功率点。最后用常规最大功率算法提高收敛精度。与传统算法不同,新方法从概率论的角度,为解决局部阴影问题提供了一种新的思路,其收敛速度及准确性不受光伏曲线形状的影响,试验和仿真表明该算法能够有效的跟踪全局最大功率点,避免其收敛于局部最优解。 相似文献
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Yi-Shuo Wu Rong Na Jian-Feng Xu Pei-De Bai Hao-Wen Jiang Qiang Ding 《Asian journal of andrology》2014,16(3):482-486
In western populations, prostate volume (PV) has been proven to be one of the strongest predictors of detecting prostate cancer (PCa) in biopsies. We performed this study in a biopsy cohort, to evaluate associations among the prostate volume, prostate-specific antigen (PSA) and PCa detection in the Chinese population. Between the years, 2007-13, 1486 men underwent prostate biopsy at Huashan Hospital, Fudan University, Shanghai, China. The study population was divided into two groups for analysis according to total PSA (tPSA) range (4 ng m1-1 〈tPSA 〈20 ng m1-1 and tPSA 〉20 ng ml-1). PV, age, tPSA, digital rectal examination (DRE) and transrectal ultrasound (TRUS) results were also included in the analysis. Although the positive biopsy rates decreased in both tPSA range groups, the downtrend was more pronounced in the 4 ng ml-2 〈tPSA 〈20 ng m1-1 group; therefore, we focused on 853 men in this group with increasing PV. In multivariate logistic regression analysis, only DRE was found to be associated with PCa in four PV groups (P 〈 0.05) and tPSA did not show a good predictive ability when PV exceeded 50 ml (P 〉 0.05). Further, it may suggest that with increasing PV, the cancer detection rate decreased in men with different tPSA, DRE and TRUS nodule statuses (all P values for trends were 〈0.001). Our study indicates that in tPSA ranging from 4 to 20 ng ml-1, the use of PV ranges of 0-35 ml, 35-50 ml and 〉50 ml might be taken into consideration for the biopsy decision-making in the Chinese population. 相似文献
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一种光伏型野战LED无影灯的研制 总被引:3,自引:3,他引:0
目的:研制一种在野外没有市电或发电机的恶劣环境下能够正常使用的光伏型野战无影灯。方法:用多组特定的LED作为无影灯的主光源,通过阳光对太阳能电池板照射后产生电流,经控制电路后供LED灯正常使用。该灯架为伞状结构,采用材质较轻的折叠架,容易架设,折叠灵活,科学安全。结果:通过野外训练、使用和测试,无影灯发光效率高、发热量低、热辐射极少、耗电量小、使用时间长,耐震动、抗冲击能力强,结构轻巧,组合简单,便于战时、野外携行。结论:该野战无影灯适用于野战后勤保障。 相似文献