Allocative efficiency measurement with endogenous prices

In the nonparametric measurement of allocative efficiency, output prices are fixed. If prices are endogenous, the overall output in the market determines the allocative efficient point. We develop an alternative semi-nonparametric model that allows prices to be endogenously determined.     

探索“2+1”人才培养模式中“1”的实践教学规划和管理体制

本文主要对我国高等职业教育的人才培养模式问题进行了研究,尤其是对"2+1"人才培养模式中最后一年的实践教学规划和管理体制进行了深入探讨,提出了4个方面的建议和具体措施。     

Resident perceptions of the impacts of P2P accommodation: Implications for neighbourhoods

Although a research base is beginning to emerge in relation to the peer-to-peer accommodation phenomenon, the voices of residents are seldom heard in this scholarly literature. This study uses Social Exchange Theory to examine resident perceptions regarding the impact of P2P accommodation growth, and specifically Airbnb, on their neighbourhood. Fifty-one semi-structured interviews were employed to illuminate understanding of how resident perceptions are formed in relation to the exchange relationship with Airbnb guests. Findings reveal a dominance of negative perceptions of socio-economic and environmental impacts. The study also contributes a typology of residents, based on their perceptions and behaviour towards associated impacts, which may guide policymakers and practitioners towards the adoption of an anthropocentric approach on P2P accommodation. The study concludes with a discussion of theoretical and practical implications.     

Impacts of peer-to-peer accommodation on the hotel industry: Hoteliers’ perspectives

The sharing economy is a new phenomenon that has considerable implications for traditional industries in general and the hospitality sector in particular. Although some recent studies have investigated the effects of sharing economy on the hotel industry, they primarily focused on quantifying its effects which are not exploratory for a phenomenon. This study attempts to achieve two research objectives. First, an exploratory qualitative method via a semi-structured in-depth interview is employed to investigate the impacts of P2P accommodation on the industry from hoteliers’ perspectives in China. Second, the current study provides valuable insights about traditional hotel marketing and operations. A social science perspective is proposed because prior hospitality research, merely in its commercial sense, fails to capture the essence of hospitality. Results indicate that P2P accommodation has effects on the hotel industry in terms of host–guest interactions, product offerings, staff empowerment, and platform collaboration. The study also suggests that the extent to which P2P accommodation impacts the hotel industry is different in terms of hotel star ratings and operating model. P2P accommodation and the hotel industry in China have a supplementary relationship. This study contributes to social studies of the hospitality literature by gaining insights from hotel senior management level. It also has great implications for the hotel marketing and management practices within the sharing context.     

MDM2和PTEN基因表达与贲门癌发生发展的相关性

目的 MDM2、PTEN基因表达与贲门癌发生发展关系的研究。方法用免疫组化S-P法检测32例贲门癌组织及18例正常贲门粘膜组织中MDM2和PTEN表达情况。结果贲门癌组织中MDM2表达34.4%,显著高于正常贲门粘膜组织(P<0.05),且与贲门癌淋巴结转移、浸润深度呈正相关。PTEN在贲门癌组织中的表达40.6%,显著低于正常贲门粘膜组织(P<0.05),且与贲门癌淋巴结转移、分化程度相关。结论 MDM2和PTEN异常表达与贲门癌的关系密切,共同参与了贲门癌的发展、转移及浸润。     

Interplay between ethanol and electric vehicles as low carbon mobility options for passengers in the municipality of São Paulo

The Brazilian cities as well as many of the large urban centers in the world continue to expand, increasing the demand for mobility and transport, while, at the same time, the same cities are investing in greenhouse gas (GHG) mitigation to avoid climate change. Brazil's urbanization rate increased from 26% in 1940 to almost 70% in 1980. During this period, the Brazilian population tripled and the urban population multiplied by seven. In 2010, the transport sector in São Paulo accounted for 71% of the total emissions released by the energy sector. Ethanol has been considered a fuel with less greenhouse gas emissions, when compared with fossil fuels. However, ethanol production would have to double to meet the expected demand. Electric vehicles (EVs) market is expanding around the world, and is also an option to reduce the transport emissions, if powered by clean electricity. To assess whether the adoption of EVs might bring more benefits than the current ethanol, we develop prospective scenarios supported by the Long-range Energy Alternatives Planning (LEAP) simulation tool, taking a bottom-up tank-to-wheel approach to consider the CO₂ emissions of car in São Paulo. The scenario considering a substitution of 25% of gasoline-powered cars by EV in 2030 showed a reduction in energy consumption and CO₂ emissions, around 15% and 26% respectively in that year in comparison with 2015. We discuss the interplay between ethanol and EV, also considering emission coefficients from life cycle analysis conducted in Brazil, and concluded EV will have higher positive impact on climate change mitigation than ethanol.     

The differences in hotel selection among various types of travellers: A comparative analysis with a useful bounded rationality behavioural decision support model

This study aims to investigate the hotel selection differences among different types of travellers through online hotel reviews. Specifically, the study performs a detailed examination of the differences in hotel key factors, criterion importance and selection results among five types of travellers, namely, business, couples, families, friends and solo. Using a sample of 194,885 online reviews on TripAdvisor.com, this study identifies the hotel key factors and criterion importance by employing the term frequency-inverse document frequency algorithm and Word2Vec algorithm. Additionally, a bounded rationality behavioural decision support model with picture fuzzy information is proposed to address hotel selection problems for different traveller types. Our results suggest that different types of travellers present differences in hotel key factors, criterion importance and selection results. However, families and friends have similar hotel selection results. This study can serve as a reference for hotel managers in understanding traveller preferences and for tourism website optimisation.     

科技哲学视角下的P2P观察思考与展望

网络信贷起源于英国,2007年引入到中国,模式从最初的资产抵押到纯信用借贷,人群从普通工薪阶层覆盖到在校大学生,形式从最初的现金业务拓展到购物消费分期。行业背后的投资来源也逐步广泛随着网贷的不断发展,诸多问题相继产生,值得我们深入探讨。     

钙热还原TiO_2法制取金属钛的技术研究

文章对钙热还原TiO2法制取金属钛的技术进行了研究,结合现代先进检测方法系统地研究了钙热还原法制备金属钛的实验过程中所用添加剂CaCl2、反应温度和反应时间等因素对整个还原反应的影响。通过对还原时间、添加剂比例等因素控制的研究结果表明:将反应温度控制在1 200℃,无水CaCl2与TiO2的质量比为1誜3,反应时间为360 min的条件下进行还原反应,最终可得到呈团聚颗粒状的金属钛,能谱仪分析其平均纯度高达99.64%。     

农村家电市场B2C电子商务物流配送模式的探讨

本文首先分析了我国B2C电子商务物流配送的三种模式,然后从现状出发,对我国农村家电市场B2C电子商务物流配送模式进行了探讨。