安徽动漫衍生品的地域性色彩表达

不同的地域差异呈现出不同的文化生态,地域文化所具有的独特性将是动漫衍生品在同行业竞争中的优势.本文从整个安徽文化的脉络思考出发,着重深挖提炼安徽传统民间文化中典型的视觉元素,为开发具有安徽地域文化特色、富有创新意识的衍生产品提出思路,使安徽动漫衍生品的开发步入良性循环的发展格局.     

分析课程中若干重要概念与定理的教学探究

对分析课程中导数与微分概念以及鲁津定理与富比尼定理的教学作了若干探究。首先,我们强调要将一元函数、多元函数以及向量值函数的导数和微分纳入统一的框架之中进行教学。其次,对于鲁津定理我们要突出定理的关键是用连续函数逼近可测函数时不能破坏函数总体性质。最后,关于富比尼定理我们指出定理的重点是先判断被积函数的可积性。     

Hydrodynamic coefficients of a simplified floating system of gravity cage in waves

Numerical simulation and experimental tests were carried out to examine the hydrodynamic behaviors of a double-column floating system of gravity cage under wave conditions. A floating system of gravity cage can be treated as a small-sized floating structure when compared with the wavelengths. The main problem in calculating the wave loads on the small-sized floating structure is to obtain the reasonable force coefficients, which may differ from a submerged structure. In this paper, the floating system of gravity cage is simplified to a 2D problem, where the floating system is set symmetrically under wave conditions. The motion equations were deduced under wave conditions and a specific method was proposed to resolve the problem of wave forces acting on a small-sized floating system of gravity cage at water surface. Results of the numerical method were compared with those from model tests and the hydrodynamic coefficients Cn and Cr were studied. It is found that Cn ranges from 0.6 to 1.0 while Cr is between 0.4 and 0.6 in this study. The results are useful for research on the hydrodynamic behavior of the deep-water gravity sea cages.     

Study on hydrodynamic vibration in fluidic flowmeter

The characteristics of the fluidic flowmeter,which is a combination of impinged concave wall and bistable fluid amplifier,is investigated by experimental studies and numerical simulations. The numerical approaches are utilized to examine the time dependent flow field and pressure field inside the proposed flowmeter. The effect of varying structural parameters on flow characteristics of the proposed fluidic flowmeter is investigated by computational simulations for the optimization. Both the simulation and experimental results disclose that the hydrodynamic vibration,with the same intensity,frequency and 180° phase shift,occurs at axisymmetric points in the feedback channel of the fluidic flowmeter. Using the structural combination of impinged concave wall and bistable fluid amplifier and differential signal processing technique,a novel fluidic flowmeter with excellent immunity and improved sensibility is developed.     

日本期货市场发展经验对中国的启示

随着经济全球化程度日益加深,期货市场发达与否关系到一国在世界大宗商品、重要战略资源乃至金融产品的定价权和话语权。日本通过改革商品期货市场的规则制度,提高商品期货市场的信用性、便利性和运行效率,商品期货市场发展迅速。中国期货市场在自身发展特点、政府监管机制和投资者结构上,与日本发展初期较为相似,因此,研究日本期货市场的成功改革,对中国期货市场的发展具有一定借鉴意义。     

试论我国衍生金融交易监管的路径选择

全球性的金融危机与衍生金融交易密不可分,世界金融界的一项重要课题。通过对不同国家和地区、金融交易监管模式的解决路径。如何有效监管和控制衍生金融交易的风险,已经成为经济组织监管模式进行系统分析,提出优化我国衍生     

海底管道水动力和在位稳定性研究的近代进展

海洋工程中海底管道为保证其正常运行和结构生存期的安全,直接与海底管道水动力和在位稳定性研究密切相关的。本文着重叙述了70年代、80年代国外对接近于海底、部分埋入海底和海底敞口浅沟内管道的水动力和在位稳定性方面的研究结果,并就进一步开展这方面研究进行讨论。     

场内金融衍生品品种研究

当前经济全球化的势头强劲,金融全球化在其中占有重要地位,而金融衍生品市场更是重中之重.然而较之繁荣的国际金融衍生品市场而言,我国金融衍生品发展的现状明显落后.本文分析了我国场内金融衍生品的市场发展历程和缺陷,并提出了在发展中克服缺陷的对策.     

金融衍生产品与风险管理

商业银行可以借助金融衍生产品的经济功能更好地实现经营目的，其主要经济功能包括：转移风险；降低交易成本；发挥财务杠杆作用，提高资产流动性；调整资产组合，实现特定的资产负债结构，不过，转移风险并不等于消灭风险，金融衍生产品交易中同样存在着很大的风险，如果不能正确运用，将引发巨额损失，从而又会限制金融衍生产品的发展。     

Energy balance of locomotion with pedal-driven watercraft

Abstract

In this study, we examined the mechanics and energetics of locomotion with a paddle-wheel boat and a water bike. Power output ([Wdot] _tot) was measured directly on the water bike by means of an instrumented chain-ring. The simultaneous assessment of oxygen uptake ([Vdot]O₂) allowed the computation of the “overall” efficiency of locomotion (η _o = [Wdot] _tot / [Vdot]O₂). Mean η _o was 0.27 (s = 0.02), which was unaffected by the speed, and was assumed to be the same for the two boats as both are semi-recumbent bicycles. For the paddle-wheel boat, [Wdot] _tot was then obtained from η _o and measures of [Vdot]O₂. The power to overcome (passive) drag was calculated as [Wdot] _d = D · v (where D is the force measured by means of a load cell when towing the boats at given speeds). Propelling efficiency was calculated as η _p = [Wdot] _d / [Wdot] _tot, which was lower with the paddle-wheel boat (mean 0.35, s = 0.01) than with the water bike (mean 0.57, s = 0.01). The observed differences in η _p and [Wdot] _d explain why at the highest speed tested (～3 m · s^?1), the energy required to cover a unit distance with the water bike is similar to that required to move the paddle-wheel boat at 1.3 m · s^?1.