静脉曲张是高科技？外行也能做得很出色

世界上有很多人有过不错的创意,但是他们当中的大部分人缺少自信、专业知识和经验。宰吾（Zeev）相信,有好的想法以后,可以自学所需要的知识,积累所需要的经验,以实践自己的想法     

Mortality salience – shedding light on the dark experience

ABSTRACT

Mortality salience, a key term in Terror Management Theory, refers to self-awareness of one’s vulnerability and ultimate mortality. This exploratory study, based on psychology and tourism literature, clarifies the degree to which a visit to a heritage site of death and atrocities evokes mortality salience as well as the relationship between mortality salience and various dimensions of the visit experience. The findings indicate that not only was mortality salience evoked during the visit, it is also an important component in understanding the motivation to visit dark sites, the emotional experience of the visit, and the impact of the visit on visitors. We therefore propose that the conceptualization and management of a death-centered heritage site can be enriched by the integration of sense of mortality salience. Additionally, the high Cronbach’s alpha suggests that the study can provide an initial basis for a scale to quantitatively measure Mortality Salience.     

Two-settlement Systems for Electricity Markets under Network Uncertainty and Market Power

We analyze welfare and distributional properties of a two-settlement system consisting of a spot market over a two-node network and a single energy forward contract. We formulate and analyze several models which simulate joint dispatch of energy and transmission resources coordinated by a system operator. The spot market is subject to network uncertainty, which we model as a random capacity derating of an important transmission line. Using a duopoly model, we show that even for small probabilities of congestion (derating), forward trading may be substantially reduced, and the market power mitigating effect of forward markets (as shown in Allaz and Vila 1993) may be nullified to a great extent. There is a spot transmission charge reflecting transportation costs from location of generation to a designated hub whose price is the underlying for the forward contract. This alleviates some of the incentive problems associated with the forward market in which spot-market trading is residual. We find that the reduction in forward trading is due to the segregation of the markets in the constrained state, and the absence of natural incentives for generators to commit to more aggressive behavior in the spot market (the strategic substitutes effect). In our analysis, we find that the standard assumption of no-arbitrage across forward and spot markets leads to very little contract coverage, even for the case with no congestion. We present an alternative view of the market where limited intertemporal arbitrage enables temporal price discrimination by competing duopolists. In this framework, we assume that all of the demand shows up in the forward market (or that the market is cleared against an accurate forecast of the demand), and the forward price is determined using a market clearing condition.     

Priority Network Access Pricing for Electric Power

We propose a priority-pricing scheme for zonal access to the electric power grid that is uniform across all buses in a zone. The independent system operator (ISO) charges bulk power traders a per unit ex ante transmission access fee. The zonal access fee serves as an access insurance premium that entitles a bulk power trader to either physical injection of one unit of energy or a compensation payment. The access fee per MWh depends on the injection zone and a self-selected strike price that serves as an insurance deductible that determines the scheduling priority of the insured transaction and the compensation level in case of curtailment. Inter-zonal transactions are charged (or credited) with an additional ex post congestion fee equal to the differences in zonal spot prices. The compensation for curtailed transactions equals the difference between the realized zonal spot price and the selected strike price (deductible level). The ISO manages congestion so as to minimize net compensation payments and thus, curtailment probabilities increase with strike price and for any particular strike price may vary from bus to bus. We calculate the rational expectations equilibrium for three-, four- and six-node systems and demonstrate that the efficiency losses of the proposed second best scheme relative to the efficient dispatch solutions are modest.     

Competitive nonlinear tariffs

This paper generalizes the study of nonlinear tariffs, i.e., those depending nonlinearly on the quantity purchased, to the case of a symmetric oligopoly. Competitive equilibria and the corresponding tariffs are analyzed in a Cournot framework. Various equilibria are obtained, which depend both upon the number of competing suppliers and the choice of market parameters used to characterize the competitors' strategies. Buyers are classified by type, each selecting an optimal consumption level in response to the prevailing tariff. The phenomena of buyer self-selection found in monopoly nonlinear pricing and the scaling of equilibrium demand elasticity found in Cournot models both appear in the results.     

“出埃及记”与创业

这些创业者与先知摩西有许多相似的性格：对事物的好奇心,发现问题的洞察力,解决问题的创造力,敢于独创的信心和勇气,以及运筹帷幄的领导力。     

三十年前,以色列也没人创业

以色列资源短缺、地区政治环境恶劣、教育发达等特点是发展创业的先决条件,如果能将催化剂——创新创业和风险投资的概念引进以色列,它定会变成世界领先的创业国家     

水与能源的创新创业者有福了

2006年,以色列在经贸工业部成立了Israel NEWTech（以色列能源与水技术创新）司,打造本国特色的水技术及新能源产业,并帮助以色列企业进入全球市场。在NEWTech的支持下,以色列把水和能源技术的标准设为全世界最高。