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一、机器的资本主义应用和机器的社会主义应用马克思指出:“生产工具的变革是社会生产力发展的显著标志。”生产工具的革命及其在生产实践中的革命性运用,带来的是社会关系的、所有制的、生产的、生活的、物质的、精神的、观念的、方式的、思维的等等一系列最深刻最革命的变化,是社会形态不断高级化的推动力。马克思研究机器大工业的资本主义应用,中心是说明机器是生产剩余价值的手段。它主要不是讲机器本身,而是讲机器的资本主义应用;主要不是讲生产力,而是讲生产力的发展对生产关系的影响。机器的应用使生产更加社会化,但生产资料… 相似文献
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在现代的建筑施工管理之中,现场的施工管理起到了决定性的作用,对于整个工程后期的质量有着很大的保障。建筑工程施工企业需要对现场的管理问题和状况进行一个详细的分析,采取针对性的措施对现场的问题进行规范化处理,同时结合企业的实际管理成本和情况,从管理的质量和执行的力度入手,最大限度的保证整个项目的经济效益。文章就从现代土建工程的现场管理要点进行分析,指出了其中的不足,并给出了相应的管理措施。 相似文献
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“共建共享”是社会主义和谐社会的重要特征,生动地诠释了以人为本的科学发展观,有以下深刻的内涵:人民主体的历史观、共同富裕的利益观、崇先尚德的荣辱观、人际关爱的伦理观、广泛参与的群众观、唯物辩证的实践观、能力本位的执政观、整合差别的公正观、奉献报偿的人生价值观、协调发展的思维观。 相似文献
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根据黄河头道拐断面2008年4月—12月水环境的监测数据,分析了PCBs在该断面水体中的季节性分布特征及源汇。结果表明:头道拐断面∑PCBs各季度平均浓度呈夏季>秋季>春季>冬季的变化特征,水体中PCBs各同系物的最大浓度大多出现在6、7、8月。PCB29和PCB98的浓度相对较高,这与我国曾大量生产低氯联苯相吻合。头道拐水体中PCBs的浓度与其他水体中PCBs的污染水平相比处于低值水平。PCBs的主要贡献源有历史残留,污废水的汇入,大气的干湿沉降作用,主要归宿是沉积物。 相似文献
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为分析矿区充填复垦土壤种植农作物的生态安全性,以中国徐州市柳新矿区复垦场地为例,对照当地农田土壤,对充填场地种植小麦不同部位As、Cd、Cr、Cu、Hg、Pb、Zn 7种重金属元素含量进行检测,分析了Cd、Cr在成熟小麦不同器官中的分布、富集情况,并利用单项污染指数法和综合指数法对小麦籽粒进行了风险评价。结果表明,三场地中Cd 和Hg在未成熟苗中的含量小于成熟茎中的含量,Cr、Cu和Zn则与之相反,Pb和As的含量规律性不太明显;复垦场地小麦未成熟根的重金属含量都小于成熟根中的含量;比照地中除Cr 和Zn之外,其余元素在未成熟根中的含量均大于成熟根的含量;参照粮食污染限量标准,小麦籽粒中Cd和Cr含量均超标。风险评价显示三场地小麦籽粒中Cd、Cr单项污染指数达到轻度至重度水平,综合污染指数处于轻度污染至中度污染水平之间。该研究对矿区粮食安全的监控具有重要的实际应用价值。 相似文献
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供水流程中的摇蚊污染影响水厂生产和自来水水质,S市水厂进行的摇蚊污染特征调查结果表明,污染水厂的摇蚊优势种是花翅摇蚊,水厂孳生的摇蚊来源于进厂原水,摇蚊主要孳生分布在水厂沉淀池。水厂沉淀池形成摇蚊污染的主要原因有:原水的悬浮物和丰富的藻类,沉淀池的温度、溶解氧、pH值,摇蚊幼虫对氯离子和混凝剂浓度的较强耐受性。 相似文献
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刘盛华 《农业机械化与电气化》2009,(3):164-165
农村信息化发展对于辽宁现代农业发展和新农村建设具有十分重要的意义。系统分析了近年来辽宁农村信息化发展的现状及取得的主要成效,并结合今后一个时期内辽宁农村信息化发展工作计划,提出具有一定针对性的措施与建议。 相似文献
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2010年在辽宁省中部地区水稻上开展一次性底施缓释尿素田间试验。结果表明:在辽宁中部地区水稻上一次性施用缓释尿素比施用普通尿素,增产效果非常明显,开原和大石桥试验点增产31.1~57.0kg/667m2,增产率为5.9%~10.9%;辽中试验点增产34.7~88.9kg/667m2,增产率为10.1%~21.3%。 相似文献
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Evaluating the Impact of Irrigation and Drainage Policies on Agricultural Sustainability 总被引:3,自引:0,他引:3
Farmers in the Broadview Water District in central Californiahave been improving irrigation practices in response to risingirrigation water prices and reductions in water supply since1989, when incentive policies were first implemented to reducethe volume of subsurface drain water generated in theDistrict. The average salinity of water deliveries hasincreased, over time, as the District has recycled largeamounts of drainage water to achieve regional restrictions ondrainage water discharge. We review irrigation and drainageactivities in Broadview since 1986 with an emphasis on thesustainability of crop production when drainage discharge islimited. Average cotton yields in Broadview have declined inrecent years, both nominally and in comparison with averageyields reported for the large county in which Broadview islocated. Average tomato yields in Broadview have increased inrecent years, but county-wide yields have exceeded Broadviewyields with greater frequency than in the late 1980s. Theseobservations suggest that average crop yields in Broadview maybe starting to reflect the increasing salinity of soil andwater resources, which may be due in part to persistentrestrictions on drainage water discharge. 相似文献
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《Agricultural Systems》2007,92(1-3):1-22
The study reports the influence of biophysical and socio-cultural factors on composition, diversity and distribution of plant species in the homegardens of the Andaman and Nicobar archipelago of India. The study also examines component interactions and productivity of the system. Four hundred and thirty homegardens were surveyed from six islands, four from Andaman (South Andaman, North Andaman, Middle Andaman and Little Andaman) and two from Nicobar district (Car Nicobar and Nancowry). In Nicobar, an aboriginal tribe, the Nicobari, predominates. The Nicobaries are Christians. However, people from different parts of the Indian subcontinent were rehabilitated in the Andamans in the mid twentieth century. A mixed culture prevails in South Andaman, but in the other Andaman islands either Bengali or Tamil culture predominates. Biophysically, South Andaman is hilly whereas Nicobar is flat. The other islands lie in between the two extremes. All are similar climatically. Twelve to thirty-four plant species were encountered in the homegardens that were planted, cared for and harvested. These plants categorized as palm, fruit, spice and forest trees, formed a three-storey structure in Andaman and a two-storey structure in Nicobar’s homegardens. The floristic similarity between the homegardens of the Andamans was 82–92%. However, it was only 12–18% between the homegardens of Andaman and Nicobar. Compared to Nicobar, species richness was greater in the homegardens of the Andamans. However, diversity was higher and evenness lower in the homegardens of Nicobar. All plant species in the homegardens of Nicobar are spontaneous in regeneration. For the Andamans, the proportion of spice trees was higher in the homegardens of South Andaman, mango and citrus in North Andaman, and pineapple and vegetables in Little Andaman. High plant diversity in these homegardens serves subsistence needs and provides income to most of the households as well. Net income in the homegardens of Andaman was 6.9 times higher compared to that in the homegardens of Nicobar. 相似文献
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冻害是北方引种香樟的重要制约因素,研究主要气象因子对香樟冻害的影响,对北方引种及驯化具有指导意义。该研究按秋末初冬气温骤降型和严冬持续低温冻害型。选取枣庄市近几年较重2次冻害,对造成2次低温冻害的几种气象因子进行对比分析,并对相关气象要素和冻害结果进行相关性检验。结果表明:①秋末初冬气温骤降型冻害的关键因子是降温幅度和极端低温的强度;②严冬持续低温冻害分析的关键因子是极端低温强度和香樟冻害临界温度的持续时间,地面极端低温对1~3年生新植香樟影响较大;③2015年11月和2016年1月的2次冻害叠加是造成枣庄市2016年香樟树毁灭性打击的关键因素。 相似文献