检索结果-南通市图书馆

Tailorable Multi-Photoresponsive Behavior Triggered by Different Sulfur Oxidation States

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CCS Chemistry 2024年第10期6卷 2465-2475页

作者： Jingjing Guo Xiaoluo Peng Shihuai Wang shuai bi Ting He Yu Cheng Zujin Zhao Ben Zhong Tang Yanli Zhao School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological UniversitySingapore 637371 State Key Laboratory of Luminescent Materials and Devices Key Laboratory of Luminescence from Molecular Aggregates of Guangdong ProvinceSouth China University of TechnologyGuangzhou 510640 School of Science and Engineering The Chinese University of Hong KongShenzhenGuangdong 518172

Photoresponsive materials are considered as promising systems for intelligent technology applications owing to the contactless spatial and temporal ***,controllable multi-photoresponsive behaviors are realized in benzo[b]thiophene derivatives(o-DMP-S,o-DMP-SO,and o-DMP-SO_(2))by modulating the sulfur oxidation *** them,o-DMP-S is photo-unreactive but possesses denser molecular packing upon ultraviolet(UV)light irradiation,exhibiting photoenhanced room-temperature phosphorescence *** stoichiometric oxidation of the sulfur atom in o-DMP-S,the resulting sulfoxide compound o-DMP-SO undergoes a radical photolysis reaction involving photodeoxygenation and photochemical rearrangement,thereby leading to the photomechanical *** sulfone compound o-DMP-SO_(2)displays prominent reversible photochromism,resulting from the radical photocyclization under 365 nm UV light *** on comprehensive experimental and computational investigations,the diverse photoresponsive behaviors of these benzo[b]thiophene derivatives are demonstrated to depend on the intersystem crossing efficiency and radical-mediated photochemical reaction activity in excited states due to the different sulfur oxidation *** work provides an insightful understanding of the relationship between molecular structure and photoresponsive behavior and opens up the opportunity for the development of photoresponsive materials with potential applications.

关键词： photoenhanced room-temperature phosphorescence photomechanical effect radicalmediated photochemical reaction reversible photochromism sulfur oxidation state

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

水电站溢洪道弧门液压启闭系统的改造探索

东北水利水电 2024年第2期42卷 64-66页

作者：毕帅梁硕国网新源集团吉林松江河水力发电有限责任公司吉林抚松134500

为了系统分析水电站溢洪道弧门液压启闭系统的改造及选出较优方案,本文在阐述弧门液压启闭系统改造必要性的基础上,提出了提升溢洪道弧门启闭机及其液压控制系统工作可靠性的3种改造方案,并对方案进行对比分析。此次改造满足了结构简单... 详细信息

为了系统分析水电站溢洪道弧门液压启闭系统的改造及选出较优方案,本文在阐述弧门液压启闭系统改造必要性的基础上,提出了提升溢洪道弧门启闭机及其液压控制系统工作可靠性的3种改造方案,并对方案进行对比分析。此次改造满足了结构简单、布局合理、安全可靠、经济适用的目标,解除了防洪安全隐患,为电站的安全稳定运行提供了保障。

关键词：溢洪道弧型闸门液压启闭系统改造

气热参数对涡轮外环冲击-气膜冷却特性影响的实验研究

在线全文

学校读者我要写书评

暂无评论

工程热物理学报 2024年第5期45卷 1476-1483页

作者：李自强王龙飞毛军逵毕帅吕城亮南京航空航天大学能源与动力学院南京210016

针对涡轮外环实际工况的复杂、多变特性,本文搭建了垂直进气、气热参数可调的涡轮外环冲击-气膜冷却实验台,借助红外测温技术,以正交实验法开展主流马赫数、吹风比和温比变化对涡轮外环冷却特性的关联性研究。结果发现:涡轮外环的面平... 详细信息

针对涡轮外环实际工况的复杂、多变特性,本文搭建了垂直进气、气热参数可调的涡轮外环冲击-气膜冷却实验台,借助红外测温技术,以正交实验法开展主流马赫数、吹风比和温比变化对涡轮外环冷却特性的关联性研究。结果发现:涡轮外环的面平均综合冷却效率随主流马赫数增大呈降低-升高-降低的变化趋势,Ma=0.5~0.8的研究范围内,Ma为0.6时涡轮外环具有最佳的综合冷却效果;提高吹风比以增大冷气流量和动压的方式增益涡轮外环内外侧的冲击、气膜冷却效果,吹风比每提高0.5,涡轮外环的面平均综合冷却效率提升1.46%~9.08%;温比由1.5变为1.6,涡轮外环的面平均综合冷却效率下降0.85%~7.95%。

关键词：涡轮外环冲击-气膜冷却综合冷却效率:多变工况

基于AMOWOA的区域综合能源系统运行优化调度

在线全文

学校读者我要写书评

暂无评论

自动化学报 2024年第3期50卷 576-588页

作者：韩永明王新鲁耿志强朱群雄毕帅张红斌北京化工大学信息科学与技术学院北京100029 智能过程系统工程教育部工程研究中心北京100029 国网经济技术研究院有限公司北京102209

目前,智能优化算法已广泛应用于工程优化中,在当前多能耦合与互补的能源发展趋势下,仅考虑系统经济指标的单目标优化模式已经不再适用于目前区域综合能源系统(Integrated energy system, IES)的运行优化调度,需要研究一种多目标运行策... 详细信息

目前,智能优化算法已广泛应用于工程优化中,在当前多能耦合与互补的能源发展趋势下,仅考虑系统经济指标的单目标优化模式已经不再适用于目前区域综合能源系统(Integrated energy system, IES)的运行优化调度,需要研究一种多目标运行策略来解决区域综合能源系统的运行优化调度问题.首先综合考虑经济与能源利用两个指标并结合商业住宅区域的特性,以系统日运行收益和一次能源利用率为优化目标构建商业住宅区域综合能源系统多目标运行优化调度模型.其次由于传统多目标智能优化算法缺乏一种最优解综合评价方法,基于非支配排序以及拥挤度计算的多目标算法框架,提出一种利用模糊一致矩阵选取全局最优解的多目标鲸鱼优化算法(A multi-objective whale optimization algorithm, AMOWOA),并将提出算法对商住区域综合能源系统多目标运行优化调度模型进行求解.最后以华东某商业住宅区域综合能源系统为例进行仿真,验证了该方法的有效性和可行性.

关键词：多目标优化综合能源系统动态层次分析鲸鱼优化算法

Effect of Squealer Tip with Deep Scale Depth on the Aero-thermodynamic Characteristics of Tip Leakage Flow

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2022年第5期31卷 1773-1789页

作者： bi shuai WANG Longfei WANG Feilong WANG Lei LI Ziqiang Jiangsu Province Key Laboratory of Aerospace Power System Nanjing University of Aeronautics and AstronauticsNanjing210016China

In this paper,the aero-thermal performance of squealer tips with deep-scale depth is numerically investigated in an axial flow turbine,which is compared with the squealer tip with traditional cavity *** methods were validated with experimental *** effect of cavity depth and tip clearance was *** numerical results show that for the squealer tip with conventional cavity depth,the size of the reflux vortex enlarges as the cavity depth *** velocity and uniformity of high entropy production rate(EPR)inside the cavity reduce obviously with the cavity developing into ***,the increase of depth 10%of the blade span(H)leads to enlargement of cavity volume,which increases the total entropy production *** the overall dimensionless entropy production rate(DEPR)of gap and cavity obtains a maximum increase of 43.54%in contrast to the case with 1%H depth *** a result,the relative leakage mass flow rate reduces by 20.6%as the cavity depth increases from 1%to 10%.Given the heat transfer,as the cavity significantly increases to 10%H,the enhanced cavity volume results in a more enormous cavity vortex with low velocity covering the floor,which weakens the convective heat transfer intensity and reduces the area of high heat *** normalized average heat transfer coefficient at the cavity bottom reduces by 40.26%compared to the cavity depth of 1%*** addition,the deep-scale cavity is more effective in inhibiting leakage flow at smaller tip *** reduction amplitude of normalized average heat transfer coefficient at the squealer floor decreases as tip clearance increases,which reduces at most by about 72.6%for the tip clearance of 1%H.

关键词： squealer tip turbine aerothermodynamics tip leakage flow deep-scale depth heat transfer numerical methods

Experimental Study on Impingement and Film Overall Cooling Characteristics of Turbine Shroud

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2022年第1期31卷 239-250页

作者： LI Ziqiang WANG Longfei MAO Junkui bi shuai WANG Feilong College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Based on the variable characteristics of the actual operating conditions of the turbine shroud and the purpose of improving the cooling effect of the turbine shroud,this paper builds a test system of the impingement-film cooling shroud with two gas inlet angles(90°,167°).The effects of film cooling hole arrangement,gas inlet angle,blowing ratio(0.7,1.0,1.5,2.0,2.5,3.0)and temperature ratio(1.2,1.3,1.4,1.5,1.6)on the cooling characteristics of the impingement-film cooling shroud were experimentally studied by infrared temperature measurement technology,especially the effects of gas inlet angle and temperature *** results showed that the film covering effect of the film cooling hole vertical or the same direction of the high-temperature gas incoming flow is better than the film covering effect of the reverse direction with the incoming flow,and the optimal arrangement of film cooling holes can improve the cooling effectiveness of the *** with 90°intake gas,the film coverage area on the shroud surface of the 167°intake gas is expanded,and the surface average overall cooling effectiveness is increased by 1.03%to 12.6%.The overall cooling effectiveness of turbine shroud increases with the increase of blowing ratio,which increases the flow rate and pressure of cooling gas,and the corresponding increase rate is between 1.04%and 9.96%.However,the increase in the temperature ratio increases the mainstream heating capacity,resulting in a decrease in the cooling effectiveness of the shroud,with a maximum reduction rate of 11.04%.

关键词： turbine shroud overall cooling effectiveness impingement-film cooling blowing ratio temperature ratio

Two-dimensional polymer-based nanosheets for electrochemical energy storage and conversion

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2018年第1期27卷 99-116页

作者： shuai bi Chenbao Lu Wenbei Zhang Feng Qiu Fan Zhang School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China

Over the past decades, two-dimensional（2D） nanomaterials possessing planar layered architecture and unique electronic structures have been being quickly developed, due to their wide potential application in the fields of chemistry, physics, and materials science. As a new family of 2D nanomaterials, 2D polymerbased nanosheets, featuring excellent characters, such as tunable framework structures, light weight, flexibility, high specific surface, and good semiconducting properties, have been emerging as one kind of promising functional materials for optoelectronics, gas separation, catalysis and sensing, etc. In this review, the recent progress in synthetic approach and characterization of 2D polymer-based nanosheets were summarized, and their current advances in electrochemical energy storage and conversion including second batteries, supercapacitors, oxygen reduction and hydrogen evolution were discussed systematically.

关键词： Two-dimensional polymer Nanosheet Nanoscale morphology Electrochemical performance Energy storage and conversion

Covalent Organic Frameworks with trans-Dimensionally Vinylene-linked π-Conjugated Motifs

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2022年第2期38卷 382-395页

作者： bi shuai MENG Fancheng ZHANG Zixing WU Dongqing ZHANG Fan School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240P.R.China

Vinylene-linked covalent organic frameworks(COFs) are a class of promising porous organic materials that feature fully π-conjugated structures, high crystallinity, permanent porosity, ultrahigh chemical stability, and extraordinary optoelectronic properties. Over the past 5 years, this kind of material has been witnessed rapid development either in chemical synthesis or in potential applications. In this review, we summarize the chemistry to synthesize vinylene-linked COFs, especially the synthetic strategies involving activation of aryl methyl groups for condensation reaction. We then scrutinize the state-of-the-art development in properties and functions of this kind of COFs. Our own opinions on the further development of the vinylene-linked COFs are also presented for discussion.

关键词： Covalent organic framework(COF) Vinylene linkage Stability π-Conjugated structure Semiconducting property

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

某款增程器超级爆震故障分析及优化

汽车科技 2024年第4期 82-87页

作者：范鹏邓湘毕帅孙永福周忠永岚图汽车科技有限公司武汉430056

目前,增程式电动汽车随着市场的关注成为了各厂家开发的焦点,其中增程专用发动机(DHE,Dedicated Hybrid Engine)的开发更是重中之重。不同于传统燃油车,DHE更加注重高效、集成、静谧的特性,因此其开发边界与整车的功率需求有着强耦合关... 详细信息

目前,增程式电动汽车随着市场的关注成为了各厂家开发的焦点,其中增程专用发动机(DHE,Dedicated Hybrid Engine)的开发更是重中之重。不同于传统燃油车,DHE更加注重高效、集成、静谧的特性,因此其开发边界与整车的功率需求有着强耦合关系。本文以某款增程器失效为例,通过对缸体破裂的分析展开,重点对发动机的热管理架构及燃烧特性进行了改善及优化,进一步规避了系统冷却能力不足以及低速早燃导致超级爆震的风险。该论文对增程器的开发以及类似故障解析具有一定参考价值。

关键词：增程式电动汽车增程器低速早燃超级爆震

维普期刊数据库博看期刊