爪哇海上体验防海盗

告别了美丽、宁静的弗里曼特尔港，“雪龙”号向着新加坡方向驶去。在印度洋上航行，风平浪静。虽然海面上气温很高，湿度也大，但有了现代化的中央空调，房间里很舒适。     

湛江南珠产业振兴战略

在我国珍珠产业中,南珠具有举足轻重的地位.在分析湛江南珠产业取得成绩的基础上,详细论述了目前存在的密集养殖、种苗退化、场地老化、产品质量下降、加工技术落后、经济效益低等问题,进一步提出了振兴湛江南珠产业的战略对策.     

土地利用变化对浙江生态系统服务价值的影响

生态系统服务功能价值理论可定量估算各类生态系统为人类提供服务的经济价值.土地是一切陆地生态系统的载体,在人类改造和利用自然的过程中不可避免地要影响各类生态系统的状况,进而影响到它们为人类提供的服务与功能.以浙江省1990年、1995年、1999年和2002年的土地利用类型数据为依据,结合浙江省的具体情况对生态价值计算方法进行修正,估算了该省生态服务价值的动态变化环境效益.结果表明,浙江省的生态服务价值经历了一个先缓慢上升后迅速下降的过程,其中水分调节和水分供应项变化的幅度大,而且不同土地类型发挥了不同的效应.     

国Ⅲ轿车排放达标背景下的排气系统改进措施

本文针对国Ⅲ汽车排放标准对发动机起动阶段的高标准排放要求,从尽快提高三元催化器起燃温度角度出发,探讨了排气系统的改进措施。     

操作条件对UF&RO工艺制取纯水效率的影响

采用UF＆RO膜组合工艺制取纯水,考察各项操作条件对系统效率的影响.结果表明,自来水经UF＆RO膜组合工艺装置的出水满足试验纯水水质要求.对于UF系统,冲洗频率、过滤方式和操作压力均影响系统的制水效率.冲洗频率越大,制水效率越高;各种过滤方式中,死端过滤效率最高;在一定范围内,操作压力升高,制水效率反而下降.对于RO系统,应根据出水水质要求,选择合适的回收率和操作压力.     

再燃法烟气脱硝技术

综述了再燃法烟气脱硝技术及其主要影响因素。通过对几种脱硝技术的分析比较，认为再燃脱硝是一种很有前景的脱硝技术，其投资和运行费用界于低NO。燃烧器和选择性催化还原技术之间，有喷氨条件下的先进再燃脱硝效率接近于选择性催化还原技术。总结了国内外对先进再燃脱硝技术各种参数影响条件的研究结果，并论述了该技术的应用要点。     

Research on ecosystem services of water conservation and soil retention: a bibliometric analysis

Environmental Science and Pollution Research - Water conservation and soil retention are two essential regulating services that are closely related, and their relationship might produce synergies...     

Effects of productivity on biodiversity in forest ecosystems across the United States and China

In the global campaign against biodiversity loss in forest ecosystems, land managers need to know the status of forest biodiversity, but practical guidelines for conserving biodiversity in forest management are lacking. A major obstacle is the incomplete understanding of the relationship between site primary productivity and plant diversity, due to insufficient ecosystem‐wide data, especially for taxonomically and structurally diverse forest ecosystems. We investigated the effects of site productivity (the site's inherent capacity to grow timber) on tree species richness across 19 types of forest ecosystems in North America and China through 3 ground‐sourced forest inventory data sets (U.S. Forest Inventory and Analysis, Cooperative Alaska Forest Inventory, and Chinese Forest Management Planning Inventory). All forest types conformed to a consistent and highly significant (P < 0.001) hump‐shaped unimodal relationship, of which the generalized coefficients of determination averaged 20.5% over all the forest types. That is, tree species richness first increased as productivity increased at a progressively slower rate, and, after reaching a maximum, richness started to decline. Our consistent findings suggest that forests of high productivity would sustain few species because they consist mostly of flat homogeneous areas lacking an environmental gradient along which a diversity of species with different habitats can coexist. The consistency of the productivity–biodiversity relationship among the 3 data sets we examined makes it possible to quantify the expected tree species richness that a forest stand is capable of sustaining, and a comparison between the actual species richness and the sustainable values can be useful in prioritizing conservation efforts.     

国产多核处理器芯片TDBI技术研究

随着集成电路的功能越来越复杂,超大规模集成电路的动态老炼越来越成为一项困难的工作。传统针对超大规模集成电路的老炼多采用静态老炼方法,这种方法不能使电路内部的功能节点动作起来,无法保证老炼效果,因此能够实现电路内部所有功能模块全动态激励的TDBI技术越来越受到人们的关注。本文以国产多核处理器芯片为测试对象,为研究多核处理器芯片的TDBI方法进行了芯片老炼测试软硬件系统开发,解决了多核处理器老炼中大功率电源供电、图形存储空间不足等关键技术。