排序方式: 共有15条查询结果,搜索用时 15 毫秒
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以某木材加工厂除尘器内的木纤维粉尘作为研究对象,对其进行爆炸特性参数测试和爆炸危险性分级研究。结果表明:结合测得的爆炸特性参数,根据美国爆炸指数E 综合分级法,危险等级为强;根据德国危险性分级方法,木纤维粉尘的爆炸等级属于St1,其爆炸特性较弱;根据国际电工委员会(IEC)分级方法,木纤维粉尘属于不需要特别注意类粉尘;结合E 综合分级法,我国将木粉划分为危险性级别高的可燃性粉尘,此分级较为合理。但对于防爆措施的实施,需要根据实际生产过程中产生的粉尘爆炸参数进行设计改造。 相似文献
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Reusing of transmitted light by localized surface plasmon enhancing of Ag nanoparticles in organic solar cells 总被引:1,自引:0,他引:1
Silver nanoparticles(Ag NPs)are synthesized with chemical method,which are introduced into the traditional organic photovoltaic(OPV)structure.The experimental results show that both the optical and photoelectric properties are en-hanced because of localized surface plasmon(LSP)effects of Ag NPs.The advantage of adding Ag NPs behind active layer in incident direction is discussed.We believe this route can avoid absorption shadow and enhance the reusing of transmitted light of active layer.The average short-circuit current(J SC)of the optimum device can be raised from 9.23mA/cm2 to 10.84mA/cm2,and the energy converting efficiency(PCE)can be raised from 3.22% to 3.85%. 相似文献
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We report the enhanced performance of organic solar cells(OSCs) based on regioregular poly(3-hexylthiophene)(P3HT) and methanofullerene [6,6]-phenyl C61-butyric acid methyl ester(PCBM) blend by using dihydroxybenzene as additive in the active layer.The effect of the content of the additives on electrical characteristics of the device is studied.The device with 0.2 wt% dihydroxybenzene additive achieves the best power conversion efficiency(PCE) of 4.58% with Jsc of 12.5 mA/cm2,Voc of 0.65 V,and FF of 66.6% under simulated solar illumination of AM 1.5G(100 mW/cm2),compared with the control device with PCE of 3.39%(35% improvement compared with the control device).The XRD measurement reveals that the addition of additives induces the crystallization of P3HT and establishes good inter-network to increase the contact area of donor and acceptor,and then helps charge to be effectively transferred to the electrode to reduce the chance of recombination.All evidences indicate that the dihydroxybenzene is likely to be a promising new type additive that can enhance the performance of organic bulk heterojunction solar cells. 相似文献
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An air-stable photovoltaic device based on znic oxide nanoparticles (ZNP) in an inverted structure of indium tin oxide (ITO)/ZnO/poly (3-hexylthiophene) (P3HT): [6,6]-phenyl C61-butyric acid methyl ester (PCBM)/MoO3/Ag is studied. We find that the optimum thickness of the MoO3 layer is 2 nm. When the MoO3 blocking layer is introduced, the fill factor of the devices is increased from 29% to 40%, the power conversion efficiency is directly promoted from 0.35% to 1.27%.The stability under ambient conditions of this inverted structure device much is better due to the improved stability at the polymer/Ag interface. The enhancement is attributed to the high carriers mobility and suitable band gap of MoO3 layer. 相似文献
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利用乙二醇还原法合成银纳米线。研究了表面活性剂聚乙烯吡咯烷酮的浓度、添加时间、滴加速度对产物形貌及银纳米线长径比的影响。结果表明,聚乙烯吡咯烷酮的添加细节影响了其对银纳米晶的包覆程度,从而影响了银纳米线的生成。优化实验参数为加入硝酸银14min后添加聚乙烯吡咯烷酮(浓度0.15mol/L,滴加速率15μL/s)。在此参数下可得到大量长径比200以上的银纳米线,以此银纳米线制备的电极,透光率达到70%以上,方块电阻为50.7Ω/cm2。 相似文献
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随着城市化进程的不断加快,城市地下空间的开发利用已经成为城市发展的重要方向。为了提高城市地下空间综合规划的合理性,本文研究了基于三维GIS的地下空间辅助规划方法,提出了地下空间辅助规划的体系架构,实现了地下空间综合规划相关影响因素及各专项规划内容的集中统一管理,针对各类数据的不同特点,形成了综合应用多种方法的三维建模体系,设计并开发了三维可视化的地下空间辅助规划系统,实现了城市地下空间规划数据的三维集成展示,并根据实际应用的需要,开发了一系列的辅助规划分析功能,为城市地下空间科学合理的规划提供辅助决策依据。 相似文献
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Al掺杂ZnO纳米棒的性能研究及其在太阳能电池中的应用 总被引:5,自引:5,他引:0
通过水热法制备了不同质量分数(0%,0.5%,1.0%和1.5%)的Al 3+掺杂ZnO纳米棒,扫描电镜(SEM)、X射线衍射(XRD)、紫外-可见(UV-vis)吸收光谱等测试结果表明,通过这种方法得到了较为规整的ZnO纳米阵列,结晶良好、具有明显的c轴生长取向;掺杂浓度的增加对产物的形貌和晶体结构产生了明显的影响。通过瞬态光谱和面电阻测试发现,Al 3+掺杂提高了ZnO传导电子的能力。将Al 3+掺杂的ZnO纳米棒同时作为电极与电子传输层,应用于有机太阳能电池器件中,在低浓度(0.5at.%)掺杂时得到最佳的器件性能,相比于未掺杂的ZnO纳米棒,短路电流提高了30%,光电转化效率提高了50%。 相似文献
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We report the plasmon-enhanced polymer bulk-heterojunction solar cells with Ag nanoparticles (AgNPs) obtained via chemical method. Here, the AgNPs films with different particle densities are introduced between the poly (3,4-ethylene dioxythiophene) poly (styrenesulfonate) (PEDOT: PSS) buffer layer and the poly (3-hexythiophene):[6,6]-phenyl-c61 butyric acid methyl ester (P3HT: PCBM) layer. By improving the optical absorption of the active layer owing to the localized surface plasmons, the power conversion efficiency of the solar cells is increased compared with the control device. It is shown that the efficiency of the device increases with the density of AgNPs. For the device employing higher density, the resulted power conversion efficiency is found to increase from 2.89% to 3.38%, enhanced by 16.96%. 相似文献
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