气候变化背景下哈萨克斯坦气候生产潜力时空特征分析

[目的]研究全球气候变化背景下气候生产潜力的时空分布特征,对于合理利用农业气候资源,促进农业生产力的提高具有重要意义。[方法]选择1901—2000年哈萨克斯坦24个代表气象站点的月平均气温和降水资料,采用Thortwaite Memorial、Miami模型估算气候生产潜力,并运用气候倾向率、M-K检验以及ArcGIS空间插值等方法对气候生产潜力时空分布特征进行分析。[结果](1)1901—2000年哈萨克斯坦气候生产潜力总体表现为增长趋势,不同时段气候生产潜力差异明显,相对于其他研究时段(T1,T3),T2(1936—1970年)时段气候生产潜力及增长速率最大,并且水热匹配状况最好;(2)哈萨克斯坦气候生产潜力空间分布地域性明显。YP(降水生产潜力)和Y E(蒸散生产潜力)总体表现为自东南向西北递减的趋势,YT(气温生产潜力)表现为自西南向东北递减的趋势,气候生产潜力高值区主要位于天山北麓及东部山区的河谷地带,低值区位于西部和南部荒漠区;(3)气候生产潜力对降水更为敏感,当气温保持不变,降水量增加(减少)10%、20%,YE将增加(减少)9.6%、19.94%。[结论]哈萨克斯坦东部气候生产潜力大于西部,天山北麓及河谷地区气候生产潜力大于平原地区,哈萨克斯坦气候生产潜力主要受降水量的制约,未来“暖干型”变化将会使研究区气候生产潜力下降。为提高农业生产潜力,必须加强对农业基础设施的建设和提高水资源的调配能力。     

Uncertainty,organizational form,and x-efficiency

When the firm is uncertain about the efficiency units of labor that it employs, some organizational forms—franchise, owner-operated, and multiplant firms— may be more profitable than others. As a result, particular organizational forms may dominate an industry with uncertain inputs. Conversely, various organizational forms may be selected by a company selecting producing units that will maximize the decision maker's expected utility of profits. This paper offers an alternative view of firm attributes associated with x-efficiency.     

The economic impact of tourism at the port of Miami

The total disaggregated economic impact that cruise industry tourism has on Dade County is examined in economic terms using a regional input-output model developmen by the Regional Science Research Institute. The analysis indicates that cruise industry tourism at the Port of Miami had a total economic impact on Dade County of $546 million in 1982. The total direct, indirect and induced number of jobs generated by the cruise industry and cruise passengers is 21,627. Wages totalling $271 million were paid in 1982 in Dade County as a result of the total impact of the cruise industry. Finally, the model revealed that cruise industry tourism contributed $264 million to the county's Gross Regional Product in 1982     

Price structure as a marketing variable: An experimental investigation

This study examines the relative impact on preferences of price level and price-structure variables. A pair of four-factor experimental designs were developed to investigate the preferences of students for automobile price structures and recent homebuyers for various price arrangements in buying a house. The findings indicate that, for a majority of the subjects, the structural variables of down payment, interest rate, and monthly payment are more important than price level in determining overall preferences.     

Back to Little Havana: Controlling Gentrification in the Heart of Cuban Miami

In this article we examine the nature and implementation of governing strategies to control the gentrification of Little Havana, the symbolic heart of Cuban Miami. We ask how Cuban American power relations at the neighborhood level operate to ‘produce’ the citizen best suited to fulfill and help reproduce policies and practices of ‘securing’ in order to gentrify Little Havana. Based on long‐term ethnographic research in Little Havana and Miami, our analysis reveals how governance operates through neighborhood‐level intermediaries and interpersonal relations. We apply Foucault's ‘pastoral power’ to Miami's Cuban exile community in order to explain how the ‘Cuban‐ness’ and ‘Latin‐ness’ of governing relations and the personification of political power are crucial to socio‐spatial control in Little Havana. Elites shape the conduct of individuals in order to achieve strategic goals in the name of community interest. Residents are key partners in the relational ensemble that governs and disciplines the neighborhood comprised mostly of low‐income, Central‐American immigrants.