To borrow or insure? Long term care costs and the impact of housing

We assess the impact of housing, the availability of reverse mortgages and long-term care (LTC) insurance on a retiree’s optimal portfolio choice and consumption decisions using a multi-period life cycle model that takes into consideration individual longevity risk, health shocks and house price risk. We determine how much an individual should borrow against their home equity and how much to insure health care costs with LTC insurance. We introduce an endogenous grid method, along with a regression based approach, to improve computational efficiency and avoid the curse of dimensionality. Our results confirm that borrowing against home equity provides higher consumption in earlier years and longevity insurance. LTC insurance transfers wealth from healthy states to disabled states, but reduces early consumption because of the payment of insurance premiums. Housing is an illiquid asset that is important in meeting bequest motives, and it reduces the demand for LTC insurance for the wealthy. We show that the highest welfare benefits come from combining a reverse mortgage with LTC insurance because of strong complementary effects between them. This result highlights the benefits of innovative products that bundle these two products together.     

浅论交通噪声对居住小区的影响特征及防治对策

选择受城市交通噪声影响显著的居住小区作为典型小区的研究对象,在其四周选择敏感目标进行工作日和周末的环境噪声监测,并对四周道路的车流、车速、车型进行24 h跟踪监测。从时间分布和空间差异进行影响特征分析,并提出相应的小区交通噪声防治措施和建议。     

考虑消纳效益的多能源枢纽荷源协调优化方法

为进一步挖掘能源互联网多能源互补的潜力,提高能源系统的运行收益,降低运行成本,提出了一种考虑消纳效益的多能源枢纽荷源协调优化方法。考虑多能源系统的约束条件,依据最小化住宅能量枢纽运行总成本构建住宅能量枢纽模型,以最大化工业能量枢纽运行总收益为目标构建工业能量的枢纽模型。根据上述两层模型的约束条件得到荷源协调优化运行中存在的问题,采用多目标加权寻优算法,设计多目标混合整数线性规划模型,实现荷源协调优化。仿真实验结果表明:所设计的考虑消纳效益的多能源枢纽荷源协调优化方法可促进可再生能源的消纳,降低多能源枢纽的运行成本,有效减少开销,提高能源系统的运行收益,为多能源枢纽的经济运行及荷源协调优化提供了新的技术途径。     

住宅小区土地使用权表现形态

住宅小区土地使用权在权利形态上表现为建筑物基地使用权和附属基地使用权,从主体形态上表现为基地地表及其上下空间利用权,主要包括屋顶平台空间利用权和地下空间利用权,各种权利均有其特定的归属和利用关系。     

Superconducting LINAC booster for the mumbai pelletron

We are in the process of constructing a superconducting linear accelerator (LINAC), to boost the energy of heavy ion beams from the 14UD Pelletron accelerator, at Tata Institute of Fundamental Research, Mumbai. The accelerating structures in the LINAC are quarter wave resonators (QWR) coated with lead which is superconducting at liquid helium temperature. With feasibility studies having been completed during the course of the 4th and 5th five-year plan periods, culminating with the demonstration of beam acceleration using one accelerating module, the construction of the LINAC is now under way.     

关于Kaehler-Einstein流形上Rastogi联络的一点注记

研究Kaehler-Einstein流形M上Rastogi;联络的拟共形曲率张量场W-,证明了若-W是平行的,则M是拟共形对称的.也得到关于M共圆对称的对应条件和结果,推广了Rastogi,贾兴琴等的工作.     

Metamaterial beam scanning leaky-wave antenna based on quarter mode substrate integrated waveguide structure

In this paper, we first propose a metamaterial structure by etching the same two interdigital fingers on the upper ground of quarter mode substrate integrated waveguide(QMSIW). The simulated results show that the proposed QMSIWbased metamaterial has a continuous phase constant changing from negative to positive values within its passband. A periodic leaky-wave antenna(LWA), which consists of 11 QMSIW-based metamaterial unit cells, is designed, fabricated,and measured. The measured results show that the fabricated antenna achieves a continuous beam scanning property from backward-43° to forward +32° over an operating frequencyrange of 8.9 GHz–11.8 GHz with return loss better than 10 d B.The measured antenna gain keeps consistent with the variation of less than 2 d B over the operating frequency range with a maximum gain of 12 d B. Besides, the measured and simulated results are in good agreement with each other, indicating the significance and effectiveness of this method.     

全光纤波片对光纤电流互感器件性能的影响

干涉型光纤传感器因其灵敏度很高而成为光纤传感器研究的一个重要组成部分。将其实用化需要解决因偏振态变化和相位随机漂移而导致的信号衰落问题,使输出信号稳定。介绍了光纤电流互感器的基本工作原理。通过理论分析,计算了波片对其温度特性的影响。为使光纤电流互感器满足全温下的使用要求,提出了检测电路的改进方案,并给出了理论依据。     

城镇住房制度改革调查测算数据库系统的研究

本文讨论了在我国建立和应用城市住房信息系统的技术方法,以江苏省泰州市为例,利用AST286微机和FOXBASE,建立了该市住房信息系统。该系统具有快速查询、增加、删除、更改住房信息,自动打印各类统计报表和绘制住房分析地图的功能。     

具有1/4对称度量联络的半Riemann流形非退化超曲面

借助Levi Civita联络的Gauss方程与Weingarten方程给出具有1/4对称度量联络的半Riemann流形非退化超曲面上的Gauss方程与Weingarten方程, 得到了这类曲面上的Gauss曲率方程和Codazzi Mainardi方程, 利用该结果可进一步研究更一般联络的性质.