The influence of risk culture on the performance of international joint-venture securities

With the development of economic globalization, culture is a key factor supporting the sustainability of foreign direct investment (FDI), especially for multinational enterprises. This paper takes the Chinese capital market as a sample and, combined with interviews with managers of international joint-venture securities (IJVS), finds that the culture of participants formed in developed and emerging capital market has a significant impact on the performance of IJVS. Using the degree of price fluctuation to measure the risk culture of each capital market, this paper observes that the risk culture in the Chinese capital market is significantly stronger than that of developed countries. This paper also finds that the stronger the risk culture IJVS shareholders have, the better they can adapt to the environment of the Chinese capital market and the better the performance they can achieve. Furthermore, risk culture distance, calculated by the risk culture differences between foreign shareholders and Chinese capital market, are significantly negatively correlated with IJVS performance and efficiency

DETC2009-87303 ROBUST VARIABLE STRUCTURE CONTROL FOR FREE-FLOATING SPACE ROBOT SYSTEM WITH DUAL-ARMS IN JOINTS SPACE

ABSTRACT In this paper, the kinematics and dynamics of free-floating space robot system with dual-arms are analyzed. It is shown that the dynamic equations of the system are nonlinearly according to inertial parameters. In order to overcome these problems, the system is modeled as under-actuated robot system, and the idea of augmentation approach is adopted. It is demonstrated that the dynamic equations of the system can be linearly depending on a group of inertial parameters. Based on this result, a robust variable structure control scheme for freefloating space robot system with dual-arms with uncertain inertial parameters to track the desired trajectories in joint space is proposed, and a planar space robot system with dualarms is simulated to verify the proposed control scheme. The advantage of the control scheme proposed is that it requires neither measuring the position, velocity and acceleration of the floating base with respect to the orbit nor controlling the position and attitude angle of the floating base. In addition to this advantage, it is computationally simple, because of choosing the controller robust for the uncertain inertial parameters rather than explicitly estimating them online. INTRODUCTION

Rechargeable metal batteries based on selenium cathodes: progress, challenges and perspectives

Rechargeable metal batteries using selenium or selenide as the cathodes have attracted considerable attention during the past few years owing to selenium/selenide possessing a high volumetric energy density that is comparable to that of sulfur, a moderate output voltage and characteristics of environmental benignity. However, the applications of Se-based rechargeable metal batteries are hindered by the easy dissolution of polyselenides with severe instances of the shuttle phenomenon, poor cycle life and coulombic efficiency, low loading and low utilization of active materials, as well as the relatively high cost of selenium. To overcome these challenges, scientists have proposed various strategies, including optimizing electrode nanostructures, developing new electrolytes, and constructing novel battery structures. Herein, this review systematically introduces various nanostructured Se-based cathode materials, and new electrolytes and separators for Se-based rechargeable metal batteries, as well as investigating the electrochemistry of various Se-based rechargeable metal batteries and cell structure designs. We also present perspectives for future development in line with the preparation of high energy density, environmentally friendly and sustainable selenium-based energy storage systems

Gate-voltage control of angular and spatial shifts for a dielectric slab containing graphene

By theoretically considering a dielectric slab containing graphene, we investigate the effect of the graphene layer on the angular Goos-Hänchen (AGH) shifts and the transverse angular and spatial shifts from the spin-Hall effect of light (SHEL) for the reflection of a light beam. Through manipulating the voltage applied to graphene via an exterior gate, it was found that near the transmission resonance of the slab containing graphene, the giant and tunable AGH shifts and transverse shifts (TS) for both s-polarized and p-polarized waves are present. We also find that near the normal incident angle, the giant and tunable TS from SHEL for both s-polarized and p-polarized waves can occur on the interface containing graphene. It is expected that these phenomena can result in significant interesting and novel applications of graphene in all kinds of optical devices, and more