改性PET沉淀设备工程实例

目前在市政净水处理厂和企业生产用水处理厂由于斜板发生型变、位移、滋生藻类造成滑泥不顺畅甚至堵塞致使最后的水处理工艺出水水质达不到生产、生活要求的现象较多.其原因在于混凝-沉淀的一般性斜板在使用过程中存在两个问题,一是热熔焊接的斜板,焊点凹凸不平,容易积泥、滋生细菌和藻类影响斜板的水力条件,再有问题是塑料斜板在紫外照射的...     

人类命运共同体面向的新型国际合作理论

国际关系中的国际合作理论经历了三次转向。第一次转向是从权宜性合作向着国际机制理论转向,或称"国际政治经济学转向"。第二次转向是共同体合作概念的"国际政治社会学转向"。第三次转向更多地发生在非西方国际关系学界,不妨称为"跨文化转向",其本质上是适应多元一体、伦理本位的国际体系。20世纪中后期以来逐渐积累特别是由2020年新型冠状病毒肺炎全球性大暴发所进一步加剧的人类"大危机"意识,对全球治理与国际合作等都提出了新的要求,实际上需要西方主导的国际关系理论"向东看""向外看",在多文明包容和伦理本位的视野下推动无政府状态体系逻辑向半政府状态体系逻辑转换,由自助转向扶助,从未来世界、古代历史、现代实践和东西合璧中探寻人类政治合作的新形式。扶助不仅盛行于古代东亚国际体系,而且体现在不少现代大国的分散性行为中。在人类命运共同体理念不断加强的新时代,可以为新一轮全球治理提供国际合作的方案与智慧。     

On the Segregation of Genetically Modified,Conventional and Organic Products in European Agriculture: A Multi‐market Equilibrium Analysis

Evaluating the possible benefits of the introduction of genetically modified (GM) crops must address the issue of consumer resistance as well as the complex regulation that has ensued. In the European Union (EU), this regulation envisions the co‐existence of GM food with conventional and quality‐enhanced products, mandates the labelling and traceability of GM products and allows only a stringent adventitious presence of GM content in other products. All these elements are brought together within a partial equilibrium model of the EU agricultural food sector. The model comprises conventional, GM and organic food. Demand is modelled in a novel fashion, whereby organic and conventional products are treated as horizontally differentiated but GM products are vertically differentiated (weakly inferior) relative to conventional ones. Supply accounts explicitly for the land constraint at the sector level and for the need for additional resources to produce organic food. Model calibration and simulation allow insights into the qualitative and quantitative effects of the large‐scale introduction of GM products in the EU market. We find that the introduction of GM food reduces overall EU welfare, mostly because of the associated need for costly segregation of non‐GM products, but the producers of quality‐enhanced products actually benefit.     

Consumer Acceptance of Second‐Generation GM Foods: The Case of Biofortified Cassava in the North‐east of Brazil

Biofortified staple foods are currently being developed to reduce problems of micronutrient malnutrition among the poor. This partly involves use of genetic modification. Yet, relatively little is known about consumer acceptance of such second‐generation genetically modified (GM) foods in developing countries. Here, we analyse consumer attitudes towards provitamin A GM cassava in the north‐east of Brazil. Based on stated preference data, mean willingness to pay is estimated at 60–70% above market prices for traditional cassava. This is higher than the results from similar studies in developed countries, which is plausible given that micronutrient malnutrition is more severe in developing countries. GM foods with enhanced nutritive attributes seem to be well received by poor consumers. However, the results also suggest that acceptance would be still higher if provitamin A were introduced to cassava through conventional breeding. Some policy implications are discussed.     

Risk premium,macroeconomic shocks,and information technology: an empirical analysis

This study empirically identifies the impact of various macroeconomic factors on the default risk premium. Using monthly data for the period 1970–2010 for the US, our estimations indicate that the monetary policy aggregates, risk-free interest rate, term structure of interest rates, inflation, and the state of the business cycle influence the risk premium. The results also provide some evidence in support of the hypothesis that the development of information technology has had a decreasing impact on the risk premium. As expected, various financial crises have had substantial and long-lasting effects on the premium. The results suggest that the direct impact of the subprime crisis and Lehman’s collapse on the risk premium was as large as two and a half percentage-points for a sustainable period. Foreign financial crises, in turn, have lowered the risk premium in the US market, suggesting a flight-to-safety phenomenon.     

Role of Information on Consumers’ Willingness‐to‐pay for Genetically‐modified Rice with Health Benefits: An Application to China

Despite their potential health benefits, the controversial nature surrounding the use of GM technology in biofortified crops remains a subject of discussion. This paper investigates the role of information on willingness‐to‐pay for folate‐biofortified rice in a Chinese folate‐deficient region. We conducted second price auctions with 252 women of childbearing age, split up into two target groups based on street (n = 132, non‐student sample) or school auctions (n = 120, student sample). Notwithstanding a general positive effect of folate‐related information (i.e. content, benefits and regional situation), evidence reveals that the non‐student sample is less concerned about GM technology. The results also provide insight into serial position effects in conflicting GM information. Whereas participants in the non‐student sample are more prone to a primacy bias when receiving both positive and negative information, an alarmist reaction is observed in the student sample. This study highlights the need for segmented, targeted communication strategies on biofortification.     

To buy or not to buy: Impact of labeling on purchasing intentions of genetically modified foods

This study conducted a partial test of the Theory of Planned Behavior [Ajzen , I., 1985. From intentions to action: a theory of planned behavior. In: Kuhl, J., Beckmenn, J. (Eds.), Action Control: From Cognition to Behavior. Springer, New York, pp. 11–39; Ajzen, I., 1989. Attitude structure and behavior. In: Breckler, S.J., Greenwald, A.G. (Eds.), Attitude Structure and Function. Lawrence Erlbaum, Springer, Hillsdale, NJ, New York, pp. 241–274; Ajzen, I., 1991. The theory of planned behavior. Organizational Behavior and Human Decision Processes 50, 179–211] by assessing an individual's attitude toward labeling of genetically modified (GM) foods on the individual's purchasing intentions. Data collected from 16,078 participants across 15 European Union member countries from the EUROBAROMETER 53 were examined. Using Univariate ANOVA, the results indicate that: (1) many (roughly 73% of the sample) of the individuals residing in the 15 European countries are less likely to purchase a food product with a label indicating the existence of a GM ingredient; (2) women were less likely to purchase the GM product than men; and (3) those individuals who are more likely to purchase a GM food believed it is unnecessary to include complete information pertaining to the use of GM organisms in the production of food products. Specifically, individuals were significantly more likely to purchase the product if they stated that (a) it is unnecessary to show information on a label pertaining to the use of GM organisms in the production of the food product, even if those GM organisms are present in some of the ingredients; (b) it is unnecessary to include information regarding the use of GM organisms in the product on a label if the GM organisms are present in the end product; and (c) the information regarding the use of a GM organism does not have to be clear. Future directions regarding research on GM foods are presented.     

Using QFD method for the ecological designing of products and services

QFD method is a method in the area of quality management. In this publication, it has been modified and used in environmental management. As an example, ecologically modiefied QFD was implemented for Bedzin district in Poland. Implementing this method in a town allows to select activities that are crucial for fulfilling ecological requirements and it leads to the improvement of the life quality of the citizens.     

浅谈橡胶粉末改性及其产品应用

简要介绍5～80目废旧橡胶粉末的表面的、化学的改性技术,使之跳开传统橡胶再生的增粘降弹思路,为废旧橡胶回收利用开启一个全新的无二次污染方式;并前瞻性地介绍了各种改性产品的应用领域及具体用途。     

聚醋酸乙烯酯乳液的改性研究进展

简述了聚醋酸乙烯酯乳液的作用和合成原理,介绍目前聚醋酸乙烯酯乳液的主要改性方法:共聚改性、保护胶体的改性、共混改性、复合乳液改性、乳化体系改性,分析不同改性方法,指出了聚醋酸乙烯酯乳液今后的发展趋势。