检索结果-南通市图书馆

Transition toward thorium fuel cycle in a molten salt reactor by using plutonium

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2017年第10期28卷 103-112页

作者： De-yang Cui Shao-Peng xia xiao-xiao Li xiang-Zhou Cai Jin-Gen Chen Shanghai Institute of Applied Physics Chinese Academy ofSciencesShanghai 201800China CAS Innovative Academies in TMSR Energy System Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The molten salt reactor(MSR), as one of the Generation Ⅳ advanced nuclear systems, has attracted a worldwide interest due to its excellent performances in safety, economics, sustainability, and proliferation resistance. The aim of this work is to provide and evaluate possible solutions to fissile 233 U production and further the fuel transition to thorium fuel cycle in a thermal MSR by using plutonium partitioned from light water reactors spent fuel. By using an in-house developed tool, a breeding and burning(B&B) scenario is first introduced and analyzed from the aspects of the evolution of main nuclides, net 233 U production, spectrum shift, and temperature feedback coefficient. It can be concluded that such a Th/Pu to Th/^(233)U transition can be accomplished by employing a relatively fast fuel reprocessing with a cycle time less than 60 days. At the equilibrium state, the reactor can achieve a conversion ratio of about 0.996 for the 60-day reprocessing period(RP) case and about 1.047 for the 10-day RP *** results also show that it is difficult to accomplish such a fuel transition with limited reprocessing(RP is 180 days),and the reactor operates as a converter and burns the plutonium with the help of thorium. Meanwhile, a prebreeding and burning(PB&B) scenario is also analyzed briefly with respect to the net 233 U production and evolution of main nuclides. One can find that it is more efficient to produce 233 U under this scenario, resulting in a double time varying from about 1.96 years for the 10-day RP case to about 6.15 years for the 180-day RP case.

关键词：钍燃料循环反应器熔盐堆先进核能系统钚循环时间轻水反应堆燃料后处理

Coupling Enhancement of a Flexible BiFeO_(3) Film-Based Nanogenerator for Simultaneously Scavenging Light and Vibration Energies

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2022年第12期14卷 137-150页

作者： xiao Han Yun Ji Li Wu Yanlong xia Chris RBowen Ya yang CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400People’s Republic of China Department of Mechanical Engineering University of BathBath BA27AKUK School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Center On Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning 530004People’s Republic of China

Coupled nanogenerators have been a research hotspot due to their ability to harvest a variety of forms of energy such as light,mechanical and thermal energy and achieve a stable direct current *** films are frequently investigated for photovoltaic applications due to their unique photovoltaic properties and bandgap-independent photovoltage,while the flexoelectric effect is an electromechanical property commonly found in solid ***,we effectively construct a new form of coupled nanogenerator based on a flexible BiFeO_(3) ferroelectric film that combines both flexoelectric and photovoltaic effects to successfully harvest both light and vibration *** device converts an alternating current into a direct current and achieves a 6.2% charge enhancement and a 19.3%energy enhancement to achieve a multi-dimensional"1+1>2"coupling enhancement in terms of current,charge and *** work proposes a new approach to the coupling of multiple energy harvesting mechanisms in ferroelectric nanogenerators and provides a new strategy to enhance the transduction efficiency of flexible functional devices.

关键词： Ferroelectric film Coupled nanogenerators Photovoltaic effect Flexoelectric effect Energy collection

Effect of polyamine on seed germination of wheat under drought stress is related to changes in hormones and carbohydrates

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2016年第12期15卷 2759-2774页

作者： LIU yang XU Hong WEN xiao-xia LIAO Yun-cheng College of Agronomy Northwest A&F University

Drought is a multifaceted stress condition that inhibits crop growth. Seed germination is one of the critical and sensitive stages of plants, and its process is inhibited or even entirely prevented by drought. Polyamines （PAs） are closely associ- ated with plant resistance to drought stress and seed germination. However, little is known about the effect of PA on the seed germination of wheat under drought stress. This study investigated the involvement of PAs in regulating wheat seed germination under drought stress. Six wheat genotypes differing in drought resistance were used, and endogenous PA levels were measured during seed germination under different water treatments. In addition, external PAwas used for seed soaking and the variation of hormones, total soluble sugar and starch were measured during the seed germination under different water treatments. These results indicated that the free spermidine （Spd） accumulation in seeds during the seed germination period favored wheat seed germination under drought stress; however, the free putrescine （Put） accumulation in seeds during the seed germination period may work against wheat seed germination under drought stress. In addition, seed soaking in Spd and spermine （Spm） significantly relieved the inhibition of seed germination by drought stress; howev- er, soaking seeds in Put had no significant effect on seed germination under drought. External Spd and Spm significantly increased the endogenous indole-3-acetic acid （IAA）, zeatin （Z）＋zeatin riboside （ZR）, abscisic acid （ABA）, and gibberellins （GA） contents in seeds and accelerated the seed starch degradation and increased the concentration of soluble sugars in seeds during seed germination. This may promote wheat seed germination under drought stress. In conclusion, free Spd and Put are key factors for regulating wheat seed germination under drought stress and the effects of Spd and Put on seed germination under drought notably related to hormones and starch metab

关键词： polyamine drought seed germination wheat abscisic acid starch

Dynamic manipulation of multimodal emission in Er^(3+)-activated non-core-shell structure for optical thermometry and information security

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第4期43卷 1702-1712页

作者： Xuan Liu Zi-xia Lin Yin-Biao Shi xiao-Yan Wang Ming-Ye Ding xiao-Fei yang College of Science Nanjing Forestry UniversityNanjing210037China Testing Center Yangzhou UniversityYangzhou225009China

Regulating luminescent dynamics of lanthanide-based luminescent materials via external stimuli is of great significance in the fields of optical thermometry and high-level ***,it is still a huge challenge to realize multimodal emissions with tunable color outputs from a single activator in simple structures via smart dynamic control of photon transition ***,we present a mechanistic strategy to achieve multimodal luminescence of Er^(3+)activators with color-switchable outputs in a non-core-shell *** the control of excitation dynamics(λ_(ex)=980,808,1532,377 nm),the population among the intermediate en ergy levels of Er^(3+)and the interaction between Er^(3+)and Yb^(3+)could be precisely modulated through energy transfer and migration processes,leading to the generation of colortunable multimodal luminescence upon diverse excitation modes(non-steady-state,single-/dual-wavelength steady,thermal activation).Inspired by its special luminescent performance,the as-obtained material exhibits great potential in noncontact thermometry,multimodal anticounterfeiting,and high-capacity information encryption by performing a series of proof-of-concept *** findings might provide a conceptual model to modulate the luminescent dynamics in a simple-structured system for the generation of color-adjustable multimodal emissions,which is convenient for the development of advanced luminescent materials toward versatile cuttingedge applications.

关键词： Lanthanide ions Multimodal emission Upconversion Downshifting Anti-counterfeiting Luminescent thermometry

Energy Management for a Residential Microgrid Using Wavelet Transform and Fuzzy Control Including a Vehicle-to-Grid System

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2016年第4期14卷 291-297页

作者： Dong-Qing Zhang Feng yang yang Luo Yu-xiao Huang Cheng-Long xia School of Energy Science and Engineering University of Electronic Science and TechnologyChengdu 611731China School of Automation Engineering University of Electronic Science and TechnologyChengdu 611731China

This paper presents the design and implementation of an energy management system （EMS） with wavelet transform and fuzzy control for a residential micro-grid. The hybrid system in this paper consists of a wind turbine generator, photovoltaic （PV） panels, an electric vehicle （EV）, and a super capacitor （SC）, which is able to connect or disconnect to the main grid. The control strategy is responsible for compensating the difference between the generated power by the wind and solar generators and the demanded power by the loads. Wavelet transform decomposes the power difference into a smoothed component and a fast fluctuated component. The command approach used for fuzzy logic rules considers the state of charging （SOC） of EV, renewable production, and the load demand as parameters. Furthermore, the command rules are developed in order to ensure a reliable grid when taking into account the EV battery protection to decide the output power of the EV. The model of the hybrid system is developed in detail under Matlab/Simulink software environment.

关键词： Energy management system (EMS),fuzzy control micro-grid renewable energies,vehicle-to-grid (V2G) wavelet.

在线全文

学校读者我要写书评

暂无评论

影响Ⅳ型狼疮肾炎临床疗效的因素分析

临床肾脏病杂志 2017年第5期17卷 265-270页

作者：张育榕漆媛媛马潇孟瑞霞杨艳王静兰州大学第二医院肾病科兰州730030

目的寻找目前常规治疗方案下,造成Ⅳ型狼疮肾炎(lupus nephritis,LN)患者治疗无效的临床风险因素。方法纳入经肾脏穿刺病理活检确诊为Ⅳ型LN,经过激素及常规免疫抑制剂治疗并且随访超过6个月的患者198例,按照6个月后的治疗效果分为有效... 详细信息

目的寻找目前常规治疗方案下,造成Ⅳ型狼疮肾炎(lupus nephritis,LN)患者治疗无效的临床风险因素。方法纳入经肾脏穿刺病理活检确诊为Ⅳ型LN,经过激素及常规免疫抑制剂治疗并且随访超过6个月的患者198例,按照6个月后的治疗效果分为有效组(148例)和无效组(50例),从人口学特征(性别、年龄、SLE病程、LN病程),临床表现(面部红斑、盘状红斑、光过敏、血管炎、皮肤紫癫、雷诺征、口腔溃疡、发热、关节痛、浆膜腔积液、脱发、外周神经炎、淋巴结炎、高血压、恶性高血压、肉眼血尿等),实验室检查(血红蛋白、网织红细胞、白细胞、血小板、血白蛋白、球蛋白、血肌酐、尿素氮、血尿酸、三酰甘油、总胆固醇、尿蛋白定量、尿红细胞),自身抗体(抗核抗体,抗双链DNA抗体,抗心磷脂抗体,抗Sm,SSA,SSB,抗核糖体蛋白,抗中性粒细胞胞浆抗体等),病理学指标(袢坏死、白金耳、袢血栓、球形硬化比例、节段硬化比例、新月体比例、纤维性比例、间质急性病变、间质慢性病变、间质细胞浸润、膜性病变等),治疗方案及转归情况各个方面分析组间差异,使用Kaplan-Meier法筛选影响Ⅳ型LN临床疗效的风险因素,建立多因素COX回归模型分析其独立风险因素。结果资料完整且规律随访的Ⅳ型LN患者共198例,无效组50例(占25.25%),有效组148例(占74.75%),2组诱导期治疗方案(单用激素,激素分别联合环磷酰胺、雷酚酸酯、FK506、环孢霉素A等)无统计学差异。进一步探究在常用治疗方案(激素及免疫抑制剂)下影响其疗效的风险因素发现,与有效组相比,无效组光过敏、肾功能异常、中等量蛋白尿、抗核糖体蛋白抗体阳性比例、肾小球球性硬化比例、慢性化指数(chronicity index,CI)、肾间质慢性化程度、肾间质细胞浸润程度及非炎症坏死性血管病变(non inflammatory necrotizing vasculopathy,NNV)比例明显增高(P<0.05)。Kaplan-Meier分析显示,肾功能异常、肾间质慢性化病变及间质细胞浸润的患者治疗无效率更高。建立多因素COX回归模型发现,起病时肾功能异常是LN临床疗效较差的独立风险因素。结论对于常规诱导方案治疗的Ⅳ型LN,起病时肾功能异常的患者临床疗效差,同时抗核糖体蛋白抗体阳性及伴有肾间质慢性化病变、间质细胞浸润、NNV可能也是LN治疗反应较差的风险因素。

关键词：系统性红斑狼疮狼疮肾炎诱导治疗风险因素

The Compact Quantum Group Uq（2）（Ⅱ）

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2006年第4期22卷 1221-1226页

作者： xiao xia ZHANG Department of Mathematics Yantai University Yantai 264005 P. R. China

In this paper, we first prove that the θ-deformation Uθ（2） of U（2） constructed by Connes and Violette is our special case of the quantum group Uq（2） constructed in our previous paper. Then we will show that the set of truces on the C^＊ -algebra Uθ, θ irrational, is determined by the set of the truces on a subalgebra of Uθ.

关键词： compact quantum group C^*-algebra trace comultiplication

Differential Calculus on Compact Quantum Group U_θ(2) and its Applications

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

Acta Mathematica Sinica,English Series 2010年第3期26卷 533-554页

作者： xiao xia ZHANG Department of Mathematics Yantai University Yantai 264005 P. R. China

In this paper, via constructing special matrices, we will show that there exists a differential calculus on Uθ（2）, where θ is an irrational number. Then using the above results, we shall discuss the properties of infinitesimal generators of corepresentations of Uθ（2）. And in the final, we shall discuss its irreducible corepresentations and give the Peter-Weyl theorem explicitly for compact quantum group Uθ（2）.

关键词： compact quantum group differential calculus Lie algebra irreducible corepresentation

Comparison of the rise of water level in the typical catchments,Three Gorges Reservoir area

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2016年第4期13卷 715-724页

作者： SUN Hong-yang LIAO xiao-yong xia Zhong-mei HE Jing Institute of Mountain Hazards and Environment Chinese Academy of Sciences and Ministry of Water ResourcesChengdu 610o41China Sichuan Academy of Agricultural Sciences Institute of Biotechnology and Nucleic TechnologyChengdu 610066China. Chengdu Institute of Biology Chinese Academy of SciencesChengdu 610041China

Water level is an important index for studying hydrologic processes. Water level rise processes were studied in three catchments(catchment I, II, III in Chen Jiagou watershed in the Three Gorge Reservoir Area) with different areas to provide useful information to inform data extension from a gauged-catchment to an ungauged catchment. The results showed that there are seasonal changes in the dominant driving mode of the rise of the water level. The rise of the water level in March is likely mainly driven by the mode of stored-full runoff, and in September or October, it is mainly driven by Horton-flow. The correlation coefficients of all indexes were significant among the three catchments, suggesting that these catchments have similarities and that water level data extension is likely to be completed successfully between the large catchment(III-Catchment) and the small catchment(ICatchment). It was confirmed that there is good similarity between the 0.6 km^2 and 6 km^2 catchments, and the data correlation is good between the catchments with the area differences in the Three Gorges Reservoir Area. In addition, the rise processes of the water level in the catchments were not only different under the same rain conditions, but this difference could also change with the rain condition.

关键词： Water level Precipitation Runoff Spearman-correlation coefficients Three Gorge Reservoir