浆态床一步法二甲醚产业化技术突破与进展

介绍了清华大学与重庆英力燃化有限公司合作开发的燃料级二甲醚合成中试研发进展。采用新型循环浆态床反应器一步法合成二甲醚技术取得了实质性突破，并获得了良好的中试结果：CO单程转化率达到60％以上，DME选择性达到94％，明显优于APCI和NKK的浆态床二甲醚合成工艺。     

气井产能的模糊综合评价

气井产能作为一个表示动态特征的参数,是气井评价的重要指标之一。依据测井数据进行产能评价,采用模糊数学中的模糊多目标决策综合评判建立了气井产能评价模型,通过对已分好类的气井建立贝叶斯判别函数,对其进行回判,并且通过实例进行验证,为气井产能评价方案提供了理论依据。     

天然气管道工程技术发展水平及推广应用

介绍了国内外天然气管道工碍技术发展水平，针对我国天然气管网建设的实际，提出了天然气管网系统分析、数字化管道、自动焊、全自动超声波检测、干空气管道干燥、新管道智能检测等6项值得推广应用的新技术。     

天然气流量计量现状与发展

天然气流量计量是天然气生产、输送和销售的关键环节，从分析发展天然气计量技术的意义角度出发，介绍了天然气流量计量技术现状，包括：计量标准、孔板流量计、涡轮流量计、超声波流量计以及其它新型的天然气计量仪表。并结合我国天然气工业发展的需要．对天然气流量计量技术的发展趋势进行了预测。     

Trip Planning and Decision Making of Self-Drive Tourists—

Abstract

Touring holidays are greenhouse gas intensive, and ways are being sought to reduce these emissions in New Zealand. This research seeks to influence rental vehicle tourists' planning and decision making towards shorter travel. Semi-structured interviews (n = 96) were conducted as part of a quasi-experimental approach, in which tourists were “treated” by receiving a purpose-designed tourist map. Three levels of planning and decision making could be distinguished, whereby both cognitive and affective processes were important. The tourist map did not influence tourists' itineraries, but tourists in New Zealand consistently followed a “travel budget” of about 3-5 hours driving per day.     

基于“北斗一代”的Zigbee无线网关设计

为了解决野外多点数据采集无供电、布线复杂和通信困难的问题,提出了一种基于“北 斗一代”的Zigbee无线网关设计方案。采用MSP430F6438、CC2341微处理器和一体化的RDSS “北斗”射频芯片完成低功耗、小成本的硬件设计。通过增加SIM卡的数量,将网关转发“ 北斗”数据的频率降至最低的5 s,提高了网关的通信速率。通过软件设计实现了Zigbee无 线传感网络和“北斗一代”系统之间数据的透明交换。该方法已成功应用于野外油气井远程 监控系统中。     

上海股市五年综观

上海股市五年综观□张国枢，张开宇上海股市自１９９０年１２用１９日发布实施上证指数以来，至１９９５年１１月１７日，已运行了５后，作为我国的一个新兴资产市场，表现出极大的生命力租发展前景。其间，风风雨雨，涨涨跌跌，吸引了千万人的积极参与，为国内外各界人士...     

煤矿爆破作业中有毒气体的危害及对策

煤矿爆破作业中,炸药在释放出爆炸能的同时也产生一些有毒气体,本文论述了这些有毒气体产生的原因,对人体的危害和避免危害的对策.     

美国页岩气产业发展的成功经验分析

美国页岩气成功发展,不仅使页岩气成为美国能源供应的重要组成部分,直接扭转了美国天然气进口的局面,而且直接导致天然气价格的持续下降。美国在页岩气领域取得的成功,缘于市场、技术、财税、政策和法律等多方面的合力,具有明显的美国政治、经济和社会的特点。在研究美国页岩气产业发展成功经验的基础上,结合我国实际提出了促进我国页岩气科学发展的建议。     

Methodology to calculate the carbon footprint of household land use in the urban planning stage

The growing concerns of climate change require implementing measures to quantify, to monitor and to minimize greenhouse gas (GHG) emissions. Nonetheless, most of the measures available are not easy to define or execute because they rely on current emissions and have a corrective character. To address this issue, a methodology to characterize GHG emissions that allows implementing preventive measures is proposed in this paper. The methodology is related to household urban planning procedures and considers urban infrastructures to characterize GHG emissions and to execute preventive measures based on sustainability design criteria. The methodology has been tested by applying it to a set of medium-sized municipalities with average GHG emissions from 6,822.32 kgCO_2eq/year to 5,913.79 kgCO_2eq/year for every residential unit. The results indicate that the greatest pollutant source is transport, especially in the issuance of street network design, followed by gas and electricity consumption. The average undevelopable land area required for the complete GHG emissions capture amounts to 3.42 m² of undevelopable land for every m² of urbanizable land and 9.02 m² of undevelopable land for every m² of built land.