检索结果-南通市图书馆

Feasibility Analysis of the Operation Strategies for Combined Cooling, Heating and Power Systems (CCHP) based on the Energy-Matching Regime

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2020年第5期29卷 1149-1164页

作者： FENG Lejun dai Xiaoye mo Junrong SHI Lin Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China

Although numerous studies have considered the two traditional operation strategies:following the electric load(FEL)and following the thermal load(FTL),for combined cooling,heating,and power(CCHP)systems in different case studies,there are limited theoretical studies on the quantification methods to assess the feasibility of these two strategies in different load demands ***,instead of a case study,we have undertaken a theoretical analysis of the suitable application scenarios for FEL and FTL strategies based on the energy-matching performance between systems'provision and users'*** compare the calculation models of energy saving rate(ESR)for FEL and FTL strategies in the left and right sub-regions of the energy-supply curve,a comprehensive parameter(^)that combines three inherently influential factors(off-design operation parameter,energy-matching parameter,and install capacity coefficient)is defined to determine the optimal installed capacity and feasibility of FEL or FTL strategies *** results indicate that greater value of x contribute to a better energy saving performance,and FEL strategy shows better performance than FTL in most load demands scenarios,and the optimal installed capacity occurs when the load demand points were located in different regions of the energy-supply ***,taking a hotel in Beijing as an example,the value of the optimal install capacity coefficient is 0.845 and the FEL strategy is also suggested,and compared to the maximum install capacity,the average values of the ESR on a typical summer day,transition season,and winter can be enhanced by 3.9%,8.8%,and 1.89%,respectively.

关键词： combined cooling heating and power systems(CCHP) energy-matching performance operation strategies comprehensive parameter energy saving performance

基于反应气混合物的ICP-MS/MS测定原油中的钒和镍

在线全文

学校读者我要写书评

暂无评论

光谱学与光谱分析 2025年第1期45卷 101-106页

作者：蔡松韬黄莹秀袁亮代宇宣莫垚坤黄建华湖南工学院材料科学与工程学院湖南衡阳421002 湖南省中医药研究院中药研究所湖南长沙410013

原油中金属元素钒和镍(V和Ni)的含量和比值可为深入了解原油的沉积环境特征和有机质类型发挥重要作用。在原油炼制过程中,V和Ni作为原油催化裂化过程中的有害金属元素,会降低催化剂的活性,严重时会导致催化剂中毒,会严重腐蚀设备,在精... 详细信息

原油中金属元素钒和镍(V和Ni)的含量和比值可为深入了解原油的沉积环境特征和有机质类型发挥重要作用。在原油炼制过程中,V和Ni作为原油催化裂化过程中的有害金属元素,会降低催化剂的活性,严重时会导致催化剂中毒,会严重腐蚀设备,在精炼之前必须对原油中的V和Ni进行脱除处理。V和Ni具有致突变性和致癌性,识别或监测原油中V和Ni进入环境的潜在危险变得越来越重要,对原油中V和Ni的含量进行高灵敏精准测定具有重要意义。采用电感耦合等离子体串联质谱(ICP-MS/MS)测定原油中V和Ni的新策略。原油样品经航空煤油简单稀释后直接采用ICP-MS/MS进行分析,针对V和Ni受到的质谱干扰,在MS/MS模式下,采用由NH_(3)/He(He为缓冲气)和H_(2)组成的反应气混合物(NH_(3)/He/H_(2))作为反应气,基于V^(+)与NH_(3)/He/H_(2)不发生反应,而V^(+)的干扰离子与NH_(3)/He/H_(2)发生反应,采用原位质量法消除干扰,选择V^(+)进行测定;基于Ni^(+)与NH_(3)/He/H_(2)发生反应,采用质量转移法消除干扰,选择无干扰团簇离子Ni(NH_(3))_(3)^(+)进行测定。通过与NH_(3)/He反应模式进行对比研究发现,对于V的测定,加入H_(2)为反应气能快速去除氩基离子的干扰,并能协同NH_(3)消除氧化物离子的干扰;对于Ni的测定,加入H_(2)为反应气能促进全氢加合物(-NH_(3))的形成,从而提高生成Ni(NH_(3))_(3)^(+)的产率。在NH_(3)/He/H_(2)反应模式下,V和Ni的背景等效浓度(BEC)更低,Ni的灵敏度更高,V和Ni的检出限(LOD)分别低至0.83和3.76 ng·kg^(-1),定量限(LOQ)分别为2.77和12.5 ng·kg^(-1)。通过分析标准参考物质NIST SRM 1634c并进行加标回收实验评价方法的准确度和精密度,结果显示,方法的测定结果与标准参考物质的认证值基本一致,V和Ni的加标回收率分别为97.7%和103%,相对标准偏差(RSD)分别为1.8%和1.9%。所建立的分析方法避免了繁琐的样品预处理过程,具有操作简单快速、灵敏度高、准确度和精密度好的特点,适用于原油中V和Ni的检测,能为原油深加工中V和Ni的脱除提供理论依据。

关键词：原油电感耦合等离子体串联质谱钒(V) 镍(Ni) 氨气/氦气/氢气(NH_(3)/He/H_(2))

A dual role of the PIWI/pi RNA machinery in regulating mRNAs during mouse spermiogenesis

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2020年第3期63卷 447-449页

作者： Peng dai Xin Wang mo-Fang Liu State Key Laboratory'of molecular Biology、Shanghai Key Laboratory of molecular Andrology CAS Center for Excellence in Molecular Cell ScienceShanghai Institute of Biochemistry and Cell BiologyChinese Academy of Sciences-University of Chinese Academy of SciencesShanghai 200031China

The post-meiotic phase of male germ cell development in mammals undergoes a series of dramatic morphological changes,including acrosome and flagellum formation,nuclear condensation,and cytoplasmic exclusion,which is driven by a highly regulated sequence of biochemical reactions(Meistrich and Hess,2013).Such differentiation process called spermiogenesis consists of at least 16 sequential transition steps in mice,including steps I to 8 for round spermatids,steps 9 to 11 for elongating spermatids,steps 12 to 14 for elongated or condensed spermatids,and final steps 15 to 16 for spermatozoa(Meistrich and Hess,2013).

关键词： steps condensed condensation

Synergistic effect of TiO_2 hierarchical submicrospheres for high performance dye-sensitized solar cells

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2017年第6期60卷 822-828页

作者： Jiang Sheng Linhua Hu Li'e mo Jichun Ye Songyuan dai Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Key Laboratory of Novel Thin Film Solar Cells Institute of Applied Technology Chinese Academy of Sciences State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University

The performance of dye-sensitized solar cells(DSCs) could be improved by using rationally designed mesoporous film structure for electron collection, dye adsorption and light scattering. The development of a novel double layer film prepared by TiO_2 hierarchical submicrospheres and nanoparticles was reported in this article. The submicrospheres were composed of rutile nanorods of 10 nm diameter and the length of 150–250 nm, which facilitated fast electron transport, charge collection and light scattering. Using a double layer structure consisting of the 10 wt% film as a dye loading layer and the 50 wt% film as the light scattering layer, C101 sensitizer and liquid electrolyte, DSC yielded power conversion efficiency of 9.68% under 1 sun illumination.

关键词： dye-sensitized solar cells rutile hierarchical submicrospheres high light harvesting high electron collection efficiency

Optimization of CZTSSe thin film solar cell performance using PbS back surface field layer

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2025年

作者： WENJING LUO ZHIJIAN BAI YUMING XUE LUOXIN WANG YANHONG DING HONGLI dai Tianjin Key Laboratory of Film Electronic & Communication Devices， School of Electronics Information Engineering， Tianjin University of Technology School of Materials Science and Engineering ，Jilin University

CZTSSe is an Earth-abundant， environmentally friendly， and low-cost material， with a current record power conversion efficiency of 14.9%， This result is well below the prediction of the Shockley-Queisser limit. To improve the performance of solar cells， a layer of PbS (BSF) was added to the CZTSSe， which was simulated using the SCAPS-1D software. The optimal photovoltaic performance of AZO/ZnO/CdS/CZTSSe/PbS/mo was studied by changing the parameters of the CZTSSe absorption layer and PbS layer. Studies have shown that the efficiency can be increased to 20.86% after using PbS.

关键词：

Co_(2)P nanorods with exposure of high-index facets for efficient photochemical reduction of CO_(2)by promoting the directional transfer of electrons

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第10期31卷 322-329,I0008页

作者： Yong Xu Jiang mo Jianfei Long Lingxiao Tu Weili dai Lixia Yang Shenglian Luo Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063JiangxiChina Key Laboratory of Photochemical Conversion and Optoelectronic Materials and HKU-CAS Joint Laboratory on New Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Herein,Co_(2)P nanorods(NRs)with exposure to high-index facets(HIFs)were prepared by a special assembly-calcination method using thioacetamide(TAA)as a structure-directing *** analysis of adsorption energies of S atoms on different facets as well as the surface energies of Co_(2)P indicate that the HIFs become more stable after adsorbing S *** rich unsaturated sites on HIFs,the photochemical reduction rate of CO_(2)over Co_(2)P NRs is 14.5 mmol h^(-1)g^(-1)for the production of CO within 3 *** analysis of electron transfer,bond lengths,bond angles and adsorption energies indicate that the CO_(2)molecules are more easily adsorbed and activated on the *** free energy calculations and d band theory demonstrate that the HIFs are conducive to reducing the formation energy barriers as well as improving the stability of the intermediate^(*)COOH,then enhancing the catalytic performance of CO_(2)reduction.

关键词： Co_(2)P High-index facet CO_(2)reduction Photocatalysis Electron transfer

Atomically precise Au_(25)(GSH)_(18)nanoclusters versus plasmonic Au nanocrystals:Evaluating charge impetus in solar water oxidation

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第6期34卷 195-199页

作者： Qiao-Ling mo Xiao-Cheng dai Yang Xiao Fang-Xing Xiao College of Materials Science and Engineering Fuzhou UniversityNew CampusMinhou 350108China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

Atomically precise metal nanoclusters(NCs)have been deemed as an emerging class of metal nanomaterials owing to fascinating size-dependent physicochemical properties,discrete energy band structure,and quantum confinement effect,which are distinct from conventional metal nanoparticles(NPs).Nevertheless,metal NCs suffer from photoinduced self-oxidative aggregation accompanied by in-situ transformation to metal NPs,markedly reducing the photosensitization of metal ***,maneuvering the generic instability of metal NCs,we perform the charge transport impetus comparison between atomically precise metal NCs and plasmonic metal NPs counterpart obtained from in-situ self-transformation of metal NCs in photoelectrochemical(PEC)water splitting *** conceptual demonstration,we proposed two quintessential heterostructures,which include TNTAs-Au_(25)heterostructure fabricated by electrostatically depositing glutathione(GSH)-protected Au_(25)(GSH)_(18)NCs on the TiO_(2)nanotube arrays(TNTAs)substrate,and TNTAs-Au heterostructure constructed by triggering self-transformation of Au_(25)(GSH)_(18)NCs to plasmonic Au NPs in TNTAs-Au_(25)via *** results indicate that photoelectrons produced over Au_(25)NCs are superior to hot electrons of plasmonic Au NPs in stimulating the interracial charge transport toward solar water *** is mainly ascribed to the significantly accelerated carrier transport kinetics,prolonged carrier lifespan,and substantial photosensitization effect of Au_(25)NCs compared with plasmonic Au NPs,resulting in the considerably enhanced PEC water splitting performance of TNTAs-Au_(25)relative to plasmonic TNTAs-Au counterpart under visible light *** work would provide important implications for rationally designing atomically precise metal NCsbased photosystems toward solar energy conversion.

关键词： Metal nanoclusters Surface Plasmon resonance Interfacial charge transfer Photoelectrochemical water splitting

Facile synthesis and in vivo bioimaging applications of porphyrin derivative-encapsulated polymer nanoparticles

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第8期33卷 4101-4106页

作者： Mengfei Hou Wandi Chen Junkai Zhao Deshen dai mo Yang Changqing Yi Guangdong Provincial Engineering and Technology Center of Advanced and Portable Medical Devices School of Biomedical EngineeringSun Yat-sen UniversityShenzhen 518107China State Key Laboratory of Oncology in South China Collaborative Innovation Center For Cancer MedicineSun Yat-sen University Cancer CenterGuangzhou 510060China Department of Biomedical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Fluorescence(FL)imaging guided photodynamic therapy(PDT)is becoming highly desirable for personalized therapy and precision *** this study,fluorescent polymer nanoparticles TCPP@PEI/PGA were facilely synthesized through electrostatic interaction-mediated self-assembly of porphyrins tetra(4-carboxyphenyl)porphine(TCPP)and polyethylenimine(PEI),and subsequent surface modification withγ-poly(glutamic acid)(γ-PGA).TCPP served a dual function as the FL imaging probe and the *** as-prepared TCPP@PEI/PGA nanoparticles showed excellent water-solubility and biocompatibility,while having outstanding capabilities of in vivo bioimaging and~1 O_(2) *** bioimaging of mice and effective killing of CT 26 cells as well as CT 26 tumor-bearing mice upon laser irradiation were successfully demonstrated when using TCPP@PEI/PGA as theranostic *** study provides a simple but robust method to design and synthesize porphyrin-based polymer nanoparticles for theranostics.

关键词： Porphyrins Fluorescence imaging Photodynamic therapy Theranostics

Polar organic tracers in PM_(2.5) aerosols from an inland background area in Southwest China: Correlations between secondary organic aerosol tracers and source apportionment

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2018年第7期30卷 281-293页

作者： Li Li Wei Lai Jinguo Pu Hengqin mo Dongjue dai Guilin Wu Shihuai Deng Rural Environment Protection Engineering & Technology Center of Sichuan Province College of Environment Sichuan Agricultural University School of Environment Tsinghua University

PM2.5 aerosol samples were collected over 12 hr and 24 hr intervals in an inland background area, Gongga mountain National Nature Reserve（hereafter shortened to Gongga）, during the summer of 2011. Polar organic tracers, inorganic ions and meteorological data were measured. The purpose of this work was to investigate the variation patterns, formation and sources of the secondary organic aerosol tracers in the studied atmosphere. The average concentrations of isoprene oxidation products, α-pinene oxidation products, β-caryophyllinic acid, sugars, sugar alcohols and anhydrosugars were 88.6 ± 106.1, 3.6 ± 5.7,0.13 ± 0.30, 13.6 ± 13.1, 31.9 ± 31.4 and 14.8 ± 10.7 ng/m^3 respectively in all aerosol *** aged α-pinene second organic aerosol（SOA） tracers（i.e., 3-hydroxyglutraric acid（3 HGA）, 3-hydroxy-2,2-dimethylglutaric acid（HDMGA）, 3-acetylpentandioic acid（APDA） and 3-methyl-1,2,3-butanetricarboxylic acid（MBTCA）） correlated significantly with each other in the 24 hr PM2.5 aerosol samples, indicating that OH· is the major factor controlling the formation of these α-pinene SOA tracers. Using the positive matrix factorization（PMF） model and the tracer-based source apportionment method, we calculated that isoprene oxidation products, α-pinene oxidation products, sesquiterpene oxidation products, biomass burning, fungi spores and anthropogenic SOA accounted for 21.9% ± 5.5%, 8.4% ± 2.1%, 3.0% ± 0.7%, 5.2% ± 5.3%, 5.0% ± 6.2% and 31.4% ± 7.8% of organic carbon respectively during the sampling period.

关键词： Isoprene oxidation products α-Pinene oxidation products β-Caryophyllinic acid Positive matrix factorization(PMF) Gongga mountain National Nature Reserve