“黑石号”货物装载地点探究

近年来,＂海上丝绸之路＂被越来越多的学者关注。＂黑石号＂作为＂海上丝绸之路＂中的重要发现,为海上丝路的研究提供了大量材料,无疑具有极高的研究价值。本文就＂黑石号＂出水的外销性瓷器,结合相关文献,对＂黑石号＂货物装载地点是何地这一问题进行探究,初步证明＂室利佛逝＂即是＂黑石号＂的装载地

Research on Risk Preference Management of Commercial Banks

随着巴塞尔协议的不断完善和实施，银行机构所面临的挑战日渐增大，越来越多的银行已开始意识到，风险偏好作为风险管理的核心内容之一，应当得到更多的重视。实践表明，金融机构若能对自身风险偏好有一清晰认识，风险偏好将会成为其风险管理的有力工具；通过增加决策制定和风险承担的一致性，不但有助于提升金融机构的经营效率，还能降低金融危机发生的几率。 本文首先阐明了研究的背景、目的和意义、研究的内容、方法和思路，然后进行了文献回顾，找到本文研究的出发点和理论基础。主体的实证研究部分，本文在详细讨论风险偏好性质和风险偏好量化模型的基础上，以我国六家上市商业银行为研究对象，对其风险偏好水平进行了定量方面的考察与衡量...The article first interprets the background, purpose, significance, contents, methods and train of thought of research, and then takes a review on related literatures to find out the starting point and theoretic foundation of research. The main part of the article is about the empirical research, which is based on the detailed discussion about properties and the quantitative model of risk preferen...学位：经济学硕士院系专业：经济学院_管理经济学学号：1532010115200

安徽芜湖铁画艺术发展现状及出路的思考

铁画,又名"铁花",是安徽芜湖地区的特色手工艺,在其诞生至今三百余年里,起起伏伏,现今已逐渐走向衰落。本文就铁画艺术诞生之初的兴盛以及发展之时的繁荣原因进行分析,通过铁画艺术历史上的成功原因,寻找目前铁画艺术如何走出困境的方法

理想声源辐射声场的数值分析

通过声场的特性和规律分析可以识别和定位噪声源,对噪声控制以及声源的设计提供参考。数值方法是求解有源声场的重要工具,复杂的声辐射一般可分解为简单的声辐射叠加。研究了单极子、偶极子、活塞等几种理想声源辐射声场的解析解,并用有限元法计算数值解,得到相应的辐射声场,包括声压、速度、指向性等量,有限元法得到的数值结果与解析解吻合;利用有限元法计算了点声源的线性阵列与平面阵列等典型的叠加声场。对各种声源的特性和辐射声场的规律以及在工程领域中的应用进行了归纳。国家自然科学基金项目(51505261);;山东省自然科学基金项目(ZR2015AM013

Hierarchical CNT@NiCo2O4 core-shell hybrid nanostructure for high-performance supercapacitors

<span lang="EN-US" style="background: yellow; font-family: &quot;Calibri&quot;,&quot;sans-serif&quot;; font-size: 10.5pt; mso-bidi-font-size: 11.0pt; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-theme-font: minor-latin; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-bidi-theme-font: minor-bidi; mso-highlight: yellow; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><font color="#000000">The mass integration of electrochemically active materials on nanosized conductive fillers is a promising strategy to achieve an ideal electrode structure for energy storage devices. In this research, a one-dimensional CNT@NiCo2O4 nanosheet core-shell structural nanocable was constructed by a facile chemical co-deposition route combined with post-calcination in air. The subsequent thermal treatment led to the transformation of the hydroxide nanosheet precursor to NiCo2O4 nanosheets, during which process the overall morphology and structure were well retained. By selecting CNTs as conductive support for ultra-thin NiCo2O4 nanosheets, a high-performance electrode for supercapacitors was obtained. Notably, the as-prepared CNT@NiCo2O4 nanocables have a high capacitance of 1038 F g(-1) at a current density of 0.5 A g(-1). Furthermore, the specific capacitance of the product was almost 100% retained after 1000 cycles, which indicates excellent structural and cycling stability. More importantly, a relatively high mass loading of active materials on CNTs was also achieved, making the practical application of such electrode materials possible. Consequently, this CNT@NiCo2O4 nanocable is a promising electrode for high-performance supercapacitors.</font></span

Carbon Nanotube/Graphene Hybrid Nanostructures and Their Application in Supercapacitors

In this paper, we review the preparation methods of carbon nanotube (CNT)/graphene composite materials for the electrode of supercapacitors, and introduce the developments of CNT/graphene/pseudocapacitive material ternary composite materials with highly electrochemical performance. The rational designed CNT/graphene composite nanostructures could largely utilize the characteristics of carbon nanomaterials for electrochemical double-large supercapacitors, such as large specific area, high conductivity and befitting porous structure, and also achieve large mass loading of pseudo-capacitive materials with high dispersion for pseudocapacitors. As a result, these composite materials are promising candidates for the electrode materials of high-performance supercapacitors with high capacitance, excellent rate performance and long lifetime

Facile Assembly of Ni-Co Hydroxide Nanoflakes on Carbon Nanotube Network with Highly Electrochemical Capacitive Performance

Herein, we demonstrate the high-density assembly of Ni-Co hydroxide nanoflakes on conductive carbon nanotube (CNT) network through a simple and rapid chemical precipitation method, presenting a low-cost and high-performance scaffold for pseudosupercapacitor. It is found that the Ni-Co layered double hydroxide (LDH) nanoflakes prefer to proliferate around large-diameter CNTs (diameter &gt; 50 nm), with conductive CNT network well-maintained. Such hierarchical nanostructures show greatly improved specific surface areas compared with bare CNT network and are freestanding without other organic binder, which can be directly employed as a binder-free compact electrode assembly. By optimizing the chemical composition of as-precipitated LDH nanoflakes, the resultant Co0.4Ni0.6(OH)(2) LDH/CNT composite nanostructures exhibit the largest specific electrochemical capacitance and the best rate performance, with their capacitance up to 1843 F/g under a low current density of 0.5 A/g and maintained at 1231 F/g when the current density is increased 20 times to 10 A/g. Importantly, such hierarchical nanostructures tend to prevent the electrode from severe structural damage and capacity loss during hundreds of charge/discharge under a high rate (2 A/g), ensuring the electrode with high-energy density (51 W h/kg) at power density of 3.3 kW/kg.&nbsp

Porous reduced graphene oxide wrapped carbon nanotube-manganese dioxide nanocables with enhanced electrochemical capacitive performance

MnO2 has ultra-low conductivity for electrodes of supercapacitors. In this research, porous reduced graphene oxide (rGO) wraps on MnO2 nanoflowers with a conductive carbon nanotube core (CNTMnO2). This nanostructure could effectively improve the surface and inner conductivity of the composites. Unlike pristine rGO, the porous rGO does not block the diffusion of electrolyte into the inner part of the composites, which allows the utilization of MnO2 in this composite capacitor very well. As a result, the as-prepared CNT-MnO2-porous rGO ternary hybrid material shows superior specific capacitance and rate performance to pristine CNT-MnO2 nanocables and pristine rGO wrapped CNTMnO2 nanocables. This synthesis strategy could be valuable for the design of better performance pseudocapacitive electrodes for supercapacitors

One-step strategy to a three-dimensional NiS-reduced graphene oxide hybrid nanostructure for high performance supercapacitors

Metal sulfides are an emerging class of high-performance electrode materials for electrochemical energy storage devices. Here, a facile hydrothermal method is reported to assemble three-dimensional (3D) NiS-reduced graphene oxide (rGO) hybrid aerogels with strong coupling between the two compounds. It is intriguing to note that NiS nanoparticles are well anchored on the 3D porous and conductive scaffold constructed from wrinkled rGO nanosheets. When evaluated as binder-free electrode materials for supercapacitors, impressive electrochemical performances are presented. Specifically, the 3D NiS-rGO aerogel nanocomposite exhibits a high capacitance of 852 F g(-1), 526 F g(-1) based on the whole electrode mass (m(NiS) : m(GO) = 45 mg/50 mg) at a current density of 2 A g(-1) and 15 A g(-1), respectively. These satisfactory electrochemical behaviors, attributed to the introduction of reduced graphene oxide, suggest the great promise of fabricating graphene-supported hybrid electrode materials for high-performance energy applications