浓缩法处理凉亭山水厂排泥水的研究

黄石市凉亭山水厂生产能力为24万m^3／d，在生产过程中，产生了大量的排泥水。对用浓缩法处理排泥水进行了深入研究，具体包括污泥总量的估算，工艺流程的确定及主要设施的构造设计等。浓缩后的排泥水含固率大于3％，上清液SS小于150mg／L。     

再分配倾向的决定:对既有文献的考察

本文对再分配倾向决定领域的既有文献进行详尽考察,认为从内在动力角度来理解各种决定因素才是根本,归纳提炼了再分配倾向决定的四大动机:经济利益动机、风险规避动机、公平信念动机和声誉理想动机。再分配倾向决定的四大动机通过不尽相同的理论逻辑机制和多种实证影响因素对人们的再分配倾向产生影响,四大动机的框架为实证研究中的因素筛选提供了有力的工具。对于该领域进一步的研究,本文提出应用实验手段的重要性,并应注意宏观变量对再分配倾向的内生性影响。     

Vulnerability Orderings for Expected Poverty Indices

Vulnerability to poverty refers to the risk of an individual or household falling below the poverty line. A partial vulnerability to poverty ordering is defined to indicate when a situation characterized by uncertainty means that people are more vulnerable to poverty than in another situation. The family of expected poverty indices used in this context contains versions under vulnerability of many well‐known poverty indices. The ordering resembles the Hardy et al. result on the Lorenz partial ordering. A separate ordering for the expected income gap ratio is also investigated. First‐order stochastic dominance is used to indicate when the expected value of the censored returns from the states increases.     

The impact of initial public offerings on innovations: Short-termism or initial governance force exit?

We study the impact of initial public offerings (IPOs) on corporate innovations in China. The findings suggest that going public significantly impedes corporate innovations by lowering overall innovation quality. For firms with shareholders selling or pledging less shares after IPO, the number of patents increases, but the nonself-citations per patent decrease relative to matched non-IPO firms. In contrast, for firms with shareholders selling or pledging more shares after IPOs, both the number of patents and nonself-citations per patent decrease. The magnitudes of impact in the latter are stronger than those of former, supporting the initial governance force exit hypothesis.     

Information flow and price discovery dynamics

Review of Quantitative Finance and Accounting - Non-homogeneous and time-varying information flow that affects the price discovery processes within and across markets is a common occurrence in...     

毛铺水库周边土壤污染及潜在生态风险评价

对毛铺水库周边农田土壤中的重金属(Cu、Pb、Zn、Cd)、总氮和总磷含量进行了监测,分析污染物的主要来源,并对其潜在的生态风险进行了评价。结果表明:毛铺水库周边农田土壤已受到重金属不同程度的污染,Cd污染已影响到了部分农田的安全生产。综合污染指数评价显示,2号和3号采样点土壤尚清洁;4、5和6号采样点土壤属轻度污染。Cd的生态风险系数最大,1、2、3和5号采样点土壤中Cd属中等生态风险危害,4号和6号采样点土壤中Cd属强度生态风险危害。     

Why Greater Cash Holdings and Short-Term Debt Simultaneously Persist? The Case of Transition Economy

This study observes and explores a puzzle in Chinese firms whereby both cash holdings and short-term debt simultaneously account for more than 20% of total assets for at least two consecutive years over the sample period. This phenomenon conflicts with the principle of corporate value maximization, and is not clearly explained by the classical theories in corporate finance. Based on the implications in the extant literature and discussions of institutional constraints of the transition economy in China, this paper develops four hypotheses that are involved with agency conflicts between the largest shareholders and creditors and the formation of this puzzling financial structure. The empirical analyses suggest that the largest shareholders with tunneling motives seek to hold more cash to serve their private interests and/or the consequent operational deficit of the listed corporations. To the ends, these corporations tend to manage the timing of short term debt financing to increase cash reserves temporarily at the end of year. Essentially, greater cash holdings on the balance sheet of these corporations related with the puzzle become a misleading signal for potential creditors, possibly contributing to the refinancing of short-term debt of these listed firms for the following year. Hence, the puzzling financial structure is connected with the timing of debt financing and adverse selection of creditors. This study enriches the stream of literature on cash holdings and debt maturity, and provides new evidence on the impact of agency problems of the largest shareholders on the association between cash holdings and debt maturity in the context of a transition economy.     

环大冶湖农田土壤重金属污染特征及潜在生态评价

对环大冶湖周边农田土壤中重金属Cu、Pb、Zn、Cd、Cr、Ni、Mn和Co的含量进行了监测,采用地积累指数法及潜在生态风险指数法对环大冶湖农田土壤中重金属元素的污染状况进行定量分析及评价,并分析了污染物的潜在来源。结果表明:环大冶湖周边土壤已受到重金属不同程度的污染,Cd污染已影响到了农田的安全生产。地积累污染指数结果表明,8种重金属元素累积程度由高到低依次为Cd、Cu、Pb、Zn、Co、Ni、Mn和Cr。土壤中Cd的地积累污染指数为1.72～4.29,1、26和28号采样点土壤Cd属重累积,其中26号土壤Cu属偏重累积,28号土壤Cu亦属严重累积。Cd的生态风险系数最大,其中25、26、27和28号采样点土壤Cd属极强生态风险危害,其中28号土壤Cu亦属较强生态风险危害。     

绿色农业发展中存在的问题和对策研究——以河南省息县为例

绿色农业是无公害农产品、绿色食品和有机食品生产加工的总称。它不但是提高农产品质量安全水平,实现农业增效、农民增收的有效路径,是未来农业的发展方向,而且是绿色食品工业的基础产业。河南省息县提出了打造"中国生态主食厨房"的县域经济发展战略,为该县绿色农业发展提供了难得机遇。发展绿色农业,生产绿色食品,保障优质食材供应,是打造"中国生态主食厨房"的基础。该县是"全国产粮大县"、"河南省产油大县"和"果蔬之乡",而且工业少、环境好,绿色农业发展已有一定基础,但是其中还存在着规模不大、品种不多、水平不高等问题。结合实际,扬长避短,做大做强绿色农业,是该县打造"中国生态主食厨房"的必由之路。研究应用区域农业发展分析方法和农户意愿评价方法,结合该县农业与绿色食品产业的发展情况,对该县绿色农业发展的优势、现状及存在问题进行了分析,提出了"更新观念、创新发展、加强研发、建立基地、树立品牌、推进土地流转、培养人才、开放发展、加强物流配送、出台扶持政策"等10条做大做强绿色农业,夯实打造"中国生态主食厨房"基础的对策建议。     

基于生态适宜性评价的耕地生态系统服务价值变化研究 ——以山东省章丘市为例

生态系统服务价值评估是当前生态经济学和环境经济学的研究热点和焦点.耕地生态适宜性评价是对影响耕地各种条件的综合评估,其结果能从一定程度上反映耕地的质量状况.该文首先选取了影响章丘市耕地生态适宜性的因子,在对研究区域进行生态适宜性评价的基础上,以生态适宜性综合指数为修正因子对耕地生态系统服务价值进行修正,使得耕地生态系统服务价值因为其生态适宜性的不同产生了区别.研究发现,章丘市的耕地生态系统服务价值从南往北逐步减少,耕地适宜性综合指数能较好的修正耕地的生态系统服务价值.