共查询到20条相似文献，搜索用时 15 毫秒
1.
用24头杂种仔猪随机分为3组,分别饲喂0、25％和50％的脱毒菜粕替代豆粕配制的日粮。结果：试验组猪的日增重分别提高3．96％和4．72％,饲料报酬分别提高3．3％和3．2％（P＞0.05）;每kg增重的饲料费分别比对照组低0．25和0．30元,每头猪多盈利31．4和38．2元。说明以一定比例的菜粕代替豆粕完全可行,经济效益显著。 相似文献
2.
ＷＡＴＥＲＱＵＡＬＩＴＹＡＮＡＬＹＳＩＳＡＮＤＡＳＳＥＳＳＭＥＮＴＯＦＲＩＶＥＲＳＩＮＪＩＬＩＮＰＲＯＶＩＮＣＥＯＦＣＨＩＮＡ￥ＷａｎｇＪｕｎ（王俊）ＺｈａｏＢａｏｚｈｏｎｇ（赵宝中）（ＤｅｐｏｒｔｍｅｎｔｏｆＥｎｖｉｒｏｎｍｅｎｔＳｃｉｅｎｃｅ，Ｎ... 相似文献
3.
A regional multiple-objective water-resource and economic optimization model was developed using a quantitative method of systematic analysis.Input to the model includes indexes of economic structure and development,water-resource utilization,wastewater and pollutant discharge,and investment in wastewater treatment.The model,which consists of producton-structure and industrial-structure optimization modules,was applied to the Guanzhong region in the middle reaches of the Huanghe(Yellow) River basin in China.By evaluating several alternative production and industrialization schemes,the modal indicate that water pollution will get worsen though wastewater treatment improves if the economy continues to develop at the planned speed without structural adjustment.However,the results also show that not only economic goals but also water-resource protection and pollution-control targets can be achieved under an alternative,recommended production and industrial structure.This example illustrates that economic development and environmental protection can be improved coordinately by the regional multiple-objective water-resource and economic optimization model.It provides an operable approach to the simultaneous sustained development of water resources and economic growth. 相似文献
4.
铁碳微电解-Fenton氧化处理海上废弃钻井液液相实验 总被引：1，自引：1，他引：0
为处理海上油田废弃钻井液,以我国海上油田广泛使用的有机正电胶钻井液为例,研究采用铁碳微电解-Fenton氧化处理工艺可行性.结果表明,废弃有机正电胶钻井液及其固液分离后的废水COD超过废水排放标准.优化铁碳微电解-Fenton氧化的适宜条件:微电解时间不低于3h;双氧水质量分数为0.5%,氧化时间为2h.铁碳微电解-Fenton氧化处理工艺对废弃钻井液废液COD有较明显的处理效果,但一轮次处理无法达到排放标准.铁碳微电解-Fenton氧化—次氯酸钠深度氧化以及多轮次铁碳微电解-Fenton氧化处理可以使固液分离后的废弃钻井液达到工业污水排放二级标准. 相似文献
5.
探索PPP融资的运作模式与双方合作机制,促进PPP融资模式在采煤塌陷地复垦项目中的应用。研究基于风险-收益均衡原则,从私人资本与政府的风险偏好特点出发,建立了项目总成本最小的最优风险分担模型;在风险分担系数已知的情况下,建立了Shapley值模型对双方收益进行合理分配。结果表明:私人投资主体的综合风险系数略大,双方基本上均担风险;私人投资主体承担绝大部分的项目资金投入,所获收益略大于政府。因此引入PPP模式进行采煤塌陷地复垦,对于政府而言,可以解决资金压力,分散不擅长的项目与金融、市场风险;对于私人投资主体而言,可以避免过多的政策与不确定性风险,获得较高的投资收益。该研究为采煤塌陷地复垦项目PPP融资谈判提供了理论依据,对加快塌陷区复垦进程具有非常重要的现实意义。 相似文献
6.
Ming-li Chen Gui-sheng Hu Ning-sheng Chen Cun-yao Zhao Song-jiang Zhao Da-wei Han 《山地科学学报》2016,13(10):1867-1879
The estimation of the value on the engineering project in tourist towns is usually very challenging and controversial. In this study, an attempt has been made to evaluate the economic value of the debris flow control engineering in tourist towns by integrating both welfare and disaster economics. The total value of debris flow prevention and control engineering in tourist towns (VDFE) includes investment cost (IC), disaster mitigation benefit (DMB), and loss of brand value (LBV). Here DMB is assessed by the cost-benefit method. The LBV is estimated by incorporating brand equity and cost-benefit methods. The engineering for debris flow control in the Hongchun Gully of southwest China was built to protect Yingxiu tourist town and was assessed as an example. The IC for the engineering is 180 million RMB, however, the VDFE reaches as high as 3401 million RMB, of which the LBV is 169 million RMB, and the input-output ratio is 1:18. Thus, the LBV cannot be neglected in case of VDFE estimation process. The more developed the tourism in one town or city is, the greater the LBV and the higher the VDFE are. 相似文献
7.
YAOYong-ling 《中国地理科学(英文版)》2003,13(1):2-8
GIS technology has been mostly concerned with handling physical data and modeling physical environment .However,the requirements of GIS for handling socio-ecnomic information in many cases are different from those concerning phenomena in the physical environment ,Analysis of capital flow among regions requires the transitions both from economic values to physical landscape and from physical surfa ce to econmoic explanation.Rapid growth of Chinese economy comes mainly from investment.There are wto main ways for obtaining high growth of investment ,One is government expenditure which usually invests in regional facility and amenity block ,which is regarded as stimulus for attracting investment.The other is the creation of investing center and corresponding capital source areas ,both of which need the central city with the highest growth rate of investment among regions.This paper presents the cluster areas of both government revenue and total investment ,the potential situation of capital flow between central city Shanghai and its neighbor provinces by using “Classification“ and “Interpolation“ functions of ArcView GIS. 相似文献
8.
YAO Yong-ling 《中国地理科学(英文版)》2003,13(1)
GIS technology has been mostly concerned with handling physical data and modeling physical environment. However, the requirements of GIS for handling socio-economic information in many cases are different from those concerning phenomena in the physical environment. Analysis of capital flow among regions requires the transitions both from economic values to physical landscape and from physical surface to economic explanation. Rapid growth of Chinese economy conies mainly from investment. There are two main ways for obtaining high growth of investment. One is government expenditure which usually invests in regional facility and amenity block, which is regarded as stimulus for attracting investment. The other is the creation of investing center and corresponding capital source areas, both of which need the central city with the highest growth rate of investment among regions. This paper presents the cluster areas of both government revenue and total investment, the potential situation of capital flow betwe 相似文献
9.
中小企业普遍存在着资本结构不合理、融资风险意识差、投融资决策缺乏整体观念等问题,“融资难”已成为制约其健康发展的瓶颈。中小企业在资本运营过程中,应将投资与融资活动有机地结合起来,在最佳资本结构下进行融资规划和投资决策,才能有效控制企业财务风险,实现企业价值最大化。通过案例分析,探讨了中小企业投融资一体化决策。 相似文献
10.
区域水环境影响评估是指导产业布局与结构优化、防范和降低环境风险的重要步骤。基于互联网爬取的企业数据,探究了江苏省1990—2020年化工类企业的时空分布特征,同时引入区域生长法模拟化工企业的潜在影响区,即考虑企业周边地形梯度差异所模拟的影响范围,最后分析了企业对周边水域的潜在影响并提出了相应的防控建议。结果表明：① 1990—2020年,江苏省化工类企业数量呈现出先快速增加而后缓慢增加再缓慢减少的变化趋势,空间上呈现“南多北少,亲水型”的分布特征;② 企业对周边水域和水源地保护区均产生一定威胁,在2020年,江苏省超过20%的水域位于化工企业3 km范围内,接近6%的水域位于企业潜在影响区域内。此外,超过200个（5%）化工类企业位于116个水源地保护区内;③ 通过梳理文献及报道资料,发现水污染事件分布与本文所识别的重点河流（孟津河、大浦港、灌河及夹江等）具有较好的一致性,说明了识别结果的可靠性。本文从化工企业的互联网数据挖掘出发,结合企业潜在影响区的模拟,能够有效识别水域影响重点区域/河段,相关研究方法可为全国化工类企业的水域影响评估提供支撑。 相似文献
11.
基于MapObjects的旅游GIS开发应用——以圆明园为例 总被引：5，自引：0，他引：5
旅游信息系统的出现为旅游业繁杂的数据管理,多元成果展示和空间数据分析提供了最为快捷、方便和准确的方法和手段。本文以圆明园风景区为例,以组件式地理信息系统软件为基础平台,在分析MO特点和应用的基础上,论述了利用MO控件设计和开发旅游地理信息系统的方法并结合VB语言定制开发了圆明园旅游信息系统。该系统是在专业GIS工具系统的功能支持下,结合旅游部门空间信息管理、分析和决策的实际需要,探索传统旅游信息发布管理方式与GIS技术进一步结合的关键技术问题,开发了地图漫游,属性查询、统计分析,公共信息检索、园区管理等实用性功能,为实现旅游信息的多源、实时、动态、形象管理提供了快速有效的技术途径。 相似文献
12.
1IntroductionDuringthe past several years,concern hasincreasedover the potential pollution of watershed by estrogeniccompounds,including steroidal hormones fromhumanand ani mal sources.Effluents from wastewater treat-ment plants are sources of endocrine-d… 相似文献
13.
Xiaolin Chen Shengfeng Yang Ronge Xing Huahua Yu Song Liu Pengcheng Li 《中国海洋大学学报(英文版)》2012,11(2):249-252
In this paper, studies were carried out to extract astaxanthin from discharged wastewater during the production of chitin and to reveal the scavenging effect of the obtained pigment on 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical. Different ratios of dichloromethane/methanol (V/V) were used to extract astaxanthin. When the ratio of dichloromethane/methanol was 2:8 and the ratio between the mixed organic solvent (dichloromethane/methanol, 2:8, V/V) and wastewater was 1:1, the highest yield of pigment was obtained (8.4 mg/ 50 mL). The concentration of free astaxanthin in the obtained pigment analyzed by HPLC was 30.02%. The obtained pigment possessed strong scavenging ability on DPPH radical and IC50 was 0.84mg/ml. 相似文献
14.
1932年以来北京主城区土地利用空间扩张特征与机制分析 总被引：5，自引：0，他引：5
基于历史地图、地形图和遥感影像提取1932年以来,北京主城区城市空间扩张,以及建筑密度空间信息。从城市土地利用扩张特征、建筑密度变化特征以及驱动机制三个方面分析北京城市土地利用扩张过程。研究表明:1984年前,北京城市呈现缓慢增长趋势。1984-1992年在市场经济驱动下,北京进入了第一次大规模快速的扩张阶段。1992-2000年间,由于我国出台了最为严格的耕地保护政策,这一时段城市空间扩张有所放缓。2000-2007年受北京城市建设规划、2008年奥运会场馆建设的影响,北京城市进入了有史以来,最快的扩张阶段。北京城市呈现单中心低密度蔓延,1982年前,城市扩张形态以相对较高的建筑密度紧凑扩张模式为主,1982年以来,呈现严重的低密度蔓延态势,特别是2000-2007年城市在5-6环之间"摊大饼"式与"遍地开花"式低密度蔓延问题更为突出。北京城市空间扩张是重大事件与人口、社会经济等因素共同驱动的结果。而且重大事件驱动对于长时间序列城市空间扩张作用更为突出。 相似文献
15.
Huafu Jiao 《中国地理科学(英文版)》1999,9(2):107-112
Since China’s reform and open-door, the countries and regions of direct investment in China’s mainland have been increasing.
In 1995, the amount of foreign direct investment (FDI) in China was US$ 37.81 billion that was from more than 170 countries
and regions. The regional structure of capital market of FDI in China has three characteristics: (1) The most of FDI was from
the near countries or regions, Hong Kong-Macao, Taiwan, Japan, South Korea, Thailand and Malaysia provided 80.3% of the amount
of FDI in 1995. (2) Only several countries and regions provided most of FDI in China. (3) According to the contributory rate,
the main capital market of FDI in China could be divided into four classes, including the guiding market, subsidiary market,
new and development market, opportunity market. Most of FDI in China was from the developing countries and regions, which
had a negative effect on the size and technical level of foreign capital enterprises. The author puts forward the countermeasures
to improve the regional structure of capital market: (1) to keep the guiding market stable, (2) to open up chiefly the subsidiary
market, (3) to guide actively the new and developing market, (4) to try hard to start the opportunity market. 相似文献
16.
Measuring Chinese Marine Environmental Efficiency: A Spatiotemporal Pattern Analysis 总被引：1，自引：0，他引：1
Environmental efficiency standards are often used to evaluate the costs of oceanic economic development. A variety of statistical analyses were applied in this study to quantify the marine environmental efficiency of 11 Chinese coastal provinces and municipalities between 2000 and 2014. Results initially reveal that environmental efficiency measures that incorporate undesirable outputs are more consistent with real production conditions and thus the use of marine economic and environmental efficiencies supplement and complement one another. Second, overall marine environmental efficiency across China tends to be low and can be spatially characterized by a transformation such that the inefficiencies noted in 2000 have subsequently been transformed to comprise a three-tiered structure that encompasses northern, central, and southern cores. Third, variation in absolute and relative marine environmental efficiency differences for the coastal regions of China have been consistent over time; values initially decreased before increasing again in a fluctuating manner over the time period of this analysis. Fourth, data show that the Pearl River Delta area has experienced the highest rate of change in marine environmental efficiency over time when economic zones are used as basic research units, although values have nevertheless fluctuated significantly. Fifth, values for total factor productivity as well as technical efficiency and change across the Chinese marine economy all fluctuated over time but increased. Data show that changes in marine environmental efficiency across China can primarily be attributed to progress in marine science and technology. Finally, levels of capital investment and marine industrial pollution intensity are not significantly correlated with marine environmental efficiency. Indeed, both marine industrial structural levels and environmental protection technologies have had a positive effect on environmental efficiency while levels of investment in marine scientific research as well as the scale of economic development, the marine economy, and the degree of external openness have all exerted negative effects on this key variable. 相似文献
17.
We established a budget model of nitrogen (N) inputs and outputs between watersheds and waterbodies to determine the sources of riverine N in the Changjiang (Yangtze) River drainage area. Nitrogen inputs in the budget included N from synthetic fertilizer, biological fixation by leguminous and other crops, wet/dry atmospheric deposition, excreta from humans and animals, and crop residues. The total N input was estimated to be 17.6 Tg, of which 20% or 3.5 Tg N was transported into waterbodies. Of the total N transported into waterbodies, the largest proportion was N from animal waste (26%), followed by N from atmospheric wet/dry deposition (25%), synthetic fertilizer N (17%), N in sewage wastes (17%), N in human waste from rural areas (6%) and industrial wastewater N (9%). We studied the spatial patterns of N inputs and outputs by dividing the Changjiang River drainage area into four sub-basins, from upstream to downstream: the Tongtian River drainage area (TTD, the headwater drainage area, 138 000 km 2 , less disturbed by human activities); the Jinsha River drainage area (JSD, 347 000 km 2 , less disturbed by human activities, approx. 3 500 km upstream of the Changjiang estuary); the Pingshan-Yichang drainage area (PYD, 520 500 km 2 , large-scale human disturbance, about 2 000 km upstream of the Changjiang estuary); and the Yichang-Datong drainage area (YDD, 699 900 km 2 , large-scale human disturbance, approx. 620 km upstream of the Changjiang estuary). The average N input into waterbodies was 2.3, 7.3, 24.1, and 28.2 kg N/ha in the TTD, JSD, PYD, and YDD sub-basins, respectively, suggesting an increase of N-components of more than 10 times from upstream to downstream areas. 相似文献
18.
焦华富 《中国地理科学(英文版)》1999,(2)
１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎ１９９５，ｔｈｅａｍｏｕｎｔｏｆＦＤＩｉｎＣｈｉｎａ（ｍａｉｎｌａｎｄ）ｗａｓＵＳ＄３７．８１ｂｉｌｉｏｎｔｈａｔｗａｓｆｒｏｍｍｏｒｅｔｈａｎ１７０ｃｏｕｎｔｒｉｅｓａｎｄｒｅｇｉｏｎｓ．Ｔｈｅｎｅａｒｒｅｇｉｏｎｓ... 相似文献
19.
Wetlands play an important ecological role and provide many functions for people,yet wetlands are cur-rently decreasing and deteriorating.The ability to calculate an economic value for the loss of wetlands is becoming in-creasingly important for policy makers.In this study,remote sensing,field investigations,department visits,and other methods were used to survey wetland types,assess wetland area changes,and calculate wetland economic value.Mar-ket value loss and ecological function value loss,caused by reduction of wetland area and environmental pollution were calculated using commonly accepted methods of market valuation,ecological valuation,environmental protection investment cost analysis,and outcome parameters.According to market value loss and ecological function value loss,preliminarily fund allocation for wetland and ecological compensation was calculated.This will provide an important reference for future Yellow River Delta eco-compensation studies. 相似文献
20.
黄河三角洲地区地处黄蓝两大国家战略重叠地带,拥有未利用地30.13万hm~2,地理位置优越,后备土地资源充足,为区域共生经济体的产生和发展提供了良好的发展空间。该文立足于黄河三角洲地区盐碱地开发利用的各种经济体,分析了盐碱地开发利用现状及农业产业开发利用存在的典型问题,构建起了3个循环单体:以种养废弃物的资源化循环利用为核心的农业"碳"循环共生模式;以网络、科技为基础的现代农业科技信息循环共生模式;以新型农业融资渠道为动力的农业资金循环共生模式。结合实践案例,探讨了以3个循环单体为基础建立黄河三角洲生态循环共生模式,以期在全国范围内逐步形成一个"可循环,可复制"的新型农业产业模式,助推绿色产业健康发展。 相似文献