国内外技术获取与高技术产业创新绩效差异——基于时滞视角的比较分析

开放式创新背景下,外部技术获取方式中的国内技术购买和国外技术引进对创新绩效的影响并不相同。运用2012-2018年高技术产业省际面板数据进行实证分析,检验在不同滞后期,技术购买、技术引进对新产品销售收入和专利的差异化影响。实证结果表明：技术购买、技术引进对高技术产业创新绩效影响的显著差异在于影响时滞不同;技术购买能在短期提升新产品销售收入和发明专利申请量;技术引进在短期只能提升新产品销售收入,对发明专利申请量的提升及对新产品销售收入的增加需要更长的时滞。内部研发支出在技术购买、技术引进与高技术产业创新绩效间发挥的调节作用不尽相同。因此,高技术产业企业应充分考虑技术购买、技术引进对创新绩效影响的时滞差异,根据不同的创新发展目标选择不同来源的外部技术,保证必要的内部研发支出并提高国外技术吸收能力。     

脂肪替代品在食品中的应用

脂肪是食品的重要组成部分,但过量摄入会引发多种疾病。本文对脂肪替代品的种类及其在食品中的应用作了概述,并对其发展前景进行了展望。     

微波技术在化学合成中的应用

微波直接将能量辐射到反应物上，使分子产生高速旋转和碰撞，实现内加热，并使微波作用下的化学反应具有强活化温转化、反应速度快、转化率高和选择性好的特点。本文综述了微波有机化学自1986年来的研究进展，介绍了微波辐射促进有机化学反应速度的原理，同时对微波在化学反应中的应用作了比较详细的总结。     

安全监控系统在新风三矿的应用

本文论述了监控系统在新风三矿的应用现状，提出监控中心在日常管理维护中存在的问题与解决办法。     

Pricing CDOs with state-dependent stochastic recovery rates

Up to the 2007 crisis, research within bottom-up CDO models mainly concentrated on the dependence between defaults. Since then, due to substantial increases in market prices of systemic credit risk protection, more attention has been paid to recovery rate assumptions. In this paper, we use stochastic orders theory to assess the impact of recovery on CDOs and show that, in a factor copula framework, a decrease of recovery rates leads to an increase of the expected loss on senior tranches, even though the expected loss on the portfolio is kept fixed. This result applies to a wide range of latent factor models and is not specific to the Gaussian copula model. We then suggest introducing stochastic recovery rates in such a way that the conditional on the factor expected loss (or, equivalently, the large portfolio approximation) is the same as in the recovery markdown case. However, granular portfolios behave differently. We show that a markdown is associated with riskier portfolios than when using the stochastic recovery rate framework. As a consequence, the expected loss on a senior tranche is larger in the former case, whatever the attachment point. We also deal with implementation and numerical issues related to the pricing of CDOs within the stochastic recovery rate framework. Due to differences across names regarding the conditional (on the factor) losses given default, the standard recursion approach becomes problematic. We suggest approximating the conditional on the factor loss distributions, through expansions around some base distribution. Finally, we show that the independence and comonotonic cases provide some easy to compute bounds on expected losses of senior or equity tranches.     

高性能八位MPUHD64180及其应用

本文简要介绍了高性能八位MPUHD64180的特点及应用技巧,并介绍了两个应用实例.     

基于联盟区块链的铁路客运出行服务系统研究

铁路客运出行服务系统需要与多个企业进行数据交互,各主体间存在缺乏信任、数据格式不统一、对账环节低效等问题,制约了铁路客运出行服务的发展。而区块链具有去中心化、不可篡改、全程留痕等特点,在铁路客运出行服务系统中引入区块链技术,有助于解决多方主体交易难题。在总结铁路客运出行服务系统现状的基础上,结合开源分布式账本平台Fabric的特点与优势,设计基于联盟区块链技术的铁路客运出行服务系统架构,并对系统的基本框架和业务流程进行了描述和分析,提出铁路客运出行服务系统中的数据共享、数据存储、数据安全、清分结算等关键技术,可以实现多方数据的可用不可见,提高合作企业参与的积极性,将为加快促进综合交通一站式出行服务平台建设提供研究支撑。