共查询到20条相似文献，搜索用时 765 毫秒
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针对广东省能源发展及碳排放现状进行分析,认为在碳中和目标下,氢能开发利用在保障能源安全及低碳转型中扮演重要角色.广东省氢能利用及产业发展在全国居于领先水平,主要体现在氢能产业链布局已具雏形、氢能推广应用规模领先全国,但同时也存在氢源保障不足、绿氢比例偏低、应用场景有待拓展等问题.结合广东省产业特色及优势,建议采用可再生能源电力电解水制氢、工业副产氢提纯等方式解决氢源问题,并积极探索氢能在工业领域深度脱碳、交通行业低碳转型、天然气掺氢等领域应用发展,减少工业、交通、建筑等领域对化石能源依赖,帮助难以减排领域深度脱碳,助力碳中和目标实现. 相似文献
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基于2000-2019年江西省相关时间序列数据,运用VAR模型分析农业科技创新、技术效率与农业经济发展之间的动态关系。研究结果表明：农业科技创新对农业经济发展的相互效果是正向的,而技术进步对农业经济发展的相互作用结果复杂,在不同时期的作用和方向不一致。相对于技术进步,农业科技创新对农业经济发展的贡献率较大。农业科技创新、农业技术效率与农业经济增长之间存在长期稳定均衡的关系,但农业科技创新投入对农业经济增长的短期影响更为显著。因此,要发挥农业科技创新与技术效率之间的相互促进作用,以科技创新促进农业经济发展,推动农业可持续发展。 相似文献
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化学灾害发生后,个体风险感知水平和客观风险水平之间的差距会进一步影响其行为倾向和后续决策,运用系统动力学软件Vensim构建模型来研究二者之间差值的拟合过程,可以更为清晰的看出风险地传播过程,特别是化学事故所引发的舆情风险和污染风险的传播情况,进而得出控制风险的几个关键时间点以及相关措施。 相似文献
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William E. McGrath 《Information processing & management》1978,14(1):17-28
In a university library, variability in circulation of books by subject area is partly but directly dependent on the academic program—e.g. if the anthropology department enrolls more students than the physics department, then more anthropology books should circulate. However, if the number of students enrolled in each subject is the same, the number of books circulated in one subject may still be larger than in the other. Therefore, other sources accounting for variability must be sought. One possible source is in the nature of the subjects themselves. For example, subjects (as represented by academic disciplines or departments) are often called hard or soft, pure or applied, life or nonlife. The purpose of this paper was to determine the relationship between these characteristics and the number of books charged out of an academic library by students. Three major hypotheses were formulated:(1) the softer a subject, the more books charged on that subject; the harder the subject, the fewer the books charged;(2) the purer the subject, the more books charged; the more applied the subject, the fewer the books charged;(3) The more a subject can be characterized as life oriented, the greater the difference in number of books charged between that subject and those characterized as nonlife oriented. A scale value for each characteristic in each of 60 academic subjects was determined by a survey of faculty of the University of Southwestern Louisiana. Correlation and multiple regression were employed to assess the proportion of circulation variance accounted for by each of the three characteristics. Other variables—masters, upper and lower level enrollments, credit hours being taught, number of books already in the library, and level of degree offered—were tested as controls. Hypothesis (1) was weakly supported under the condition that shelflist and masters enrollments were held constant (3% of variance). Support was somewhat firmer (10% variance) when the dependent variable was defined as proportion of shelflist circulated. Hard/soft was also significant (15% of variance) when pure/applied was held constant, but shelflist and enrollments were not. Hypothesis (2) was modestly supported under the condition that other variables were not held constant. Otherwise pure/applied was not significant. Together, pure/applied and hard/soft, in that order, and when no other variables were controlled accounted for 26% of the variance. Hypothesis (3) was not supported under any of the conditions tested. Results have implications in sociological understanding of the relationship between disciplines and library use, in formulating a rationale for library collection building, and in administrative, budget allocations to subjects. 相似文献
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Dietary spice components ofCurcuma longa andAbroma augusta have been screened for their protective effect against reactive oxygen species induced lipid peroxidation. They have been
found to be efficient antioxidant when administered in combination. The purpose of the study was to investigate the effect
of oral administration (300mg/Kg) of the aqueous extract of turmeric whose active ingredient isCurcumin andAbromine powder as a hypoglycemic agent mixed with diet. The effect of this aqueous extract on blood glucose, lipid peroxidation (LPO)
and the antioxidant defense system in rat tissues like liver, lung, kidney and brain was studied for 8 weeks in streptozotocin
induced diabetic rats. The administration of an aqueous extract of turmeric and abromine powder resulted in a significant
reduction in blood glucose and an increase in total haemoglobin. The aqueous extract also resulted in decreased free radical
formation in the tissues studied.
The decrease in thiobarbituric acid reactive substances (TBARS) and increase in reduced glutathione (GSH), superoxide dismutase
(SOD) and catalase (CAT) clearly showed the antioxidant property of the mixture. It is suggested that these changes initially
counteract the oxidative stress in diabetes however, a gradual decrease in the antioxidative process may be one of the factors
which results in chronic diabetes. These results indicate that the mixture of the two plants have shown antidiabetic activity
and also reduced oxidative stress in diabetes. A combination ofAbroma augusta and Curcuma longa also restored the other general parameters in diabetic animals. The results were statistically analyzed and indicated that
combination of herbal extracts showed better efficacy as compared to individual herbal plant extracts used. 相似文献
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Georg Pilleri 《Endeavour》1979,3(2):48-56
The Indus dolphin is an endemic, relict species, well adapted to the turbid water of the river. It is a constant swimmer with extremely short sleep phases, besides being a continuous emitter of sound. Loss of sight is compensated by an efficient sonar system. Alone among cetaceans, the Indus dolphin swims on its side, feeling its way along the bottom with the right or left flipper. These are secondary adaptations in a species whose Miocene ancestors inhabited clear coastal waters. 相似文献
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The river dolphins, of which there are now five species, are among the world's most endangered animals. This article describes the steps that have been taken — based on systematic study of its anatomy, ecology, and breeding and behavioural habits — to preserve the rare Chinese river dolphin. This is now limited to about 300 individuals in the middle and lower reaches of the Changjiang River. 相似文献
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