柯树背岩体铀金成矿远景分析

本文在研究柯树背岩体矿物岩石学特征基础上 ,通过对该岩体的铀金成矿元素丰度、铀金矿化类型、铀金矿石物质成分及成矿阶段的划分、矿脉的铀金含量及其相关关系、围岩蚀变及原生晕特点、铀金矿化控制因素的详细研究 ,从岩体的放射性地质地球化学特点、岩体蚀变及剥蚀强度、岩石化学及稀土元素地球化学、矿脉向深部的变化趋势等几个方面分析了该岩体的铀金成矿远景及今后找矿工作的意见 ,指出该岩体西体南部断续出现的柯树背—隘高断裂上盘 1km范围与下寮—大坑里断裂夹持区为铀金成矿远景区。     

重庆大气可吸入颗粒物中多环芳烃的分析测定

本文报告了重庆大气可吸入颗粒物(IP)中多环芳烃(PAH)的分析测定方法和结果.用GC-MS定性和定量分析了重庆IP中的PAH;研究了IP中PAH的种类和分布情况;确认重庆IP中存在甲基多环芳烃(MePAH)、约占33%;颗粒大小分布表明,约有98%PAH存在于小于3μm的颗粒中.     

珍贵油料植物诸葛菜的研究

四川大学植物遗传研究室经过几年的调查研究,发现诸葛菜的农艺性状较好,分枝多、角果多,每果子粒多,千粒重较重,含油量较高,特别是油分品质优异,其营养价值高的脂肪酸如油酸和亚油酸的含量较高,分别为20.32％,和53.17％,其营养价值低的脂肪酸如亚麻酸和芥酸的含量较低,分别为4.76％和0.94％,是油菜优质育种的优异新种源,可以作为油菜远缘杂交育种亲本,并可能选育出优质油料新作物。本文对诸葛菜的开花授粉习性作了观察,对核型特点作了分析,可供育种工作的参考,诸葛菜主产中国。四川大学在国内外首先推荐这种有希望的油料新种源。     

臭氧激光雷达技术及应用研究进展

差分吸收臭氧激光雷达是完善光化学立体监测体系的重要技术,因其高时空分辨率的廓线探测优势而得以迅速发展,目前已被广泛应用于对流层臭氧浓度的遥感探测。阐述了臭氧激光雷达的原理,归纳总结了雷达系统及关键技术的国内外最新研究进展,梳理了臭氧激光雷达在环境领域的应用现状,并基于我国城市臭氧污染问题现状和管理需求,初步探索设计了臭氧激光雷达监测网络业务应用的整体框架。指出了臭氧激光雷达技术及应用中存在厂家众多但缺乏统一的技术规范和行业标准,数据质量及准确性有待提高,与标准分析方法产生数据的可比性较差等不足之处;提出了核心部件国产化,系统小型化、自动化及商用化,多平台以及与其他监测方式联用等发展趋势。     

中国高精度温室气体排放清单编制研究进展

高精度温室气体排放清单是摸清区域碳排放来源、识别时空演变特征的数据基础,也是政府部门科学制定“减污降碳”策略、实现“双碳”目标的科技支撑。通过调研国内外组织机构、科研团队在高精度排放清单方面的成果,从核算范围、核算方法、时空化方法、评估与校验4个方面介绍了我国温室气体排放清单编制方法的研究进展。针对我国高精度温室气体排放清单研究区域分散、方法与格式不统一的问题,提出我国清单编制要逐步统筹本地化、精细化和动态化的发展建议。     

A Simulation of Temporal and Spatial Variations in Carbon at Landscape Level: A Case Study for Lake Abitibi Model Forest in Ontario,Canada

Using a case study of the Lake Abitibi Model Forest (LAMF), this study aims to assess the temporal and spatial variability in carbon storage during 1990–2000, and to present a comprehensive estimation of the carbon budget for LAMF's ecosystems. As well, it provided the information needed by local forest managers to develop ecological and carbon-based indicators and monitor the sustainability of forest ecosystems. Temporal and spatial carbon dynamics were simulated at the landscape level using ecosystem model TRIPLEX1.0 and Geographical Information System (GIS). The simulated net primary productivity (NPP) and carbon storage in forest biomass and soil were compared with field data and results from other studies for Canada's boreal forests. The results show that simulated NPP ranged from 3.26 to 3.34 tC ha⁻¹ yr⁻¹ in the 1990s and was consistent with the range measured during the Boreal Ecosystem-Atmosphere Studies (BOREAS) in central Canada. Modeled NPP was also compared with the estimation from remote sensing data. The density of total above-and belowground biomass was 125.3, 111.8, and 106.5 tC ha⁻¹ for black spruce, trembling aspen, and jack pine in the LAMF ecosystem, respectively. The total carbon density of forested land was estimated at 154.4 tC ha⁻¹ with the proportion of 4:6 for total biomass and soil. The analysis of net carbon balance of ecosystem suggested that the LAMF forest ecosystem was acting as a carbon sink with an allowable harvest in the 1990s.     

报废弹药烧毁作业环境废气污染治理研究

报废弹药销毁作业中,需要对大量的炸药及火工品进行烧毁,存在比较严重的环境污染问题.通过研究被烧毁弹药的结构、性能、组成和特点,系统分析了烧毁过程中所产生污染物的成分.根据各有害气体、重金属粉尘的特性分别确立了相应的治理方法,并对现行的烧毁炉烧毁和野外烧毁作业设计了环境污染综合治理工艺.     

砷矿区植物对重金属的吸收和富集特征

通过野外调查研究了云南楚雄雨露砷矿区采矿、冶炼废弃地生长的16种优势植物的生长状态及其对应根区土壤的基本理化性质.结果表明,该矿区植物长势良好,未出现受害症状.土壤磷氮含量充足,As含量远远超过《土壤环境质量标准》3级标准中的旱地As含量标准值,高达133倍.16种植物的地上部重金属含量As最高,并且在总As平均质量比高达5 318 mg/kg的土壤环境条件下,蜈蚣草(Pteris vittata L.)体内As质量比可达2 327 mg/kg,小酸模(Rumex acetosella L.)、辣子草(Galinsoga parviflora Cav.)、鬼针草(Bidens pilosa L.)等7种植物对Cd,以及牛口刺(Cirsium shansiense Petrak.)对Zn的富集系数和转移系数均大于1.0,其中地石榴对Cd的富集系数高达7.99.上述植物对重金属污染均表现出了较强的耐性,具有进一步的研究潜力.     

Markov reliability model research of monitoring process in digital main control room of nuclear power plant

Monitoring process is an important part in a high safety digital main control room of nuclear power plant (NPP), it is the source extracted information and found abnormal information in time. As the human factors events arisen from monitoring process recently take place more and more frequent, the authors propose a reliability Markov model to effectively decrease these abnormal events. The model mainly analyzes next monitoring object probability in terms of current information and plant state. The authors divide digital human–machine interface into two parts that are referred as logical homogeneous Markov and logical heterogeneous Markov. For the former, a series of methods of probability evaluation are proposed, such as, Markov transition probability with condition, probability distributed function with human factors, system state and alarm; for the latter, the authors propose the calculation of probability of correlation degree between last time and next time and probability calculation methods with multi-father nodes. The methods can effectively estimate the transition probability from a monitoring component to next monitoring component at time t, can effectively analyze which information is more important in next monitoring process and effectively find more useful information in time t + 1, so that the human factors events in monitoring process can greatly be decreased.     

海南省环境承载力研究

环境承载力是衡量人类社会经济与环境协调程度的重要指标,同时环境承载力是可以朝着环境经济协调发展的方向进行改变的.经济的快速发展可能引发比较严重的资源环境问题,通过对区域环境承载力进行评价,及时发现区域发展过程中存在的问题,提出调整对策和措施,实现可持续发展.通过建立海南省环境承载力评价指标体系,确定各指标阈值,对环境承...