硫酸钾尾液冷冻回收高硫钾比矿物工艺研究

以硫酸钾尾液为原料,研究低温冷冻回收高硫钾比矿物合理的工艺技术路线,探寻适宜的贮存条件,为加工车间夏季高温生产硫酸钾提供优质高硫钾比原料.在低温下进行冷冻试验,根据冷冻结晶矿物产率及其干基组分确定适宜的冷冻温度为-15～5℃,冷冻制得的结晶矿物硫钾比均在3.0～5.1,符合夏季生产硫酸钾所需原料硫钾比>2.5的要求.高...     

丁腈橡胶在燃气介质中的老化性能测试研究

基于烘箱热空气老化试验方法,建立了一种能让试验样品处于流通气氛冲刷的闭合试验装置,对橡胶材料进行燃气环境中老化性能测试。选用丁腈橡胶为试样,测试其在不同温度、不同气氛下的老化性能,预测其使用时间。测试结果显示,采用空气气氛方法进行丁腈橡胶加速老化试验,预测的使用时间结果与实际使用时间的偏差在80%以上;燃气气氛冲刷环境下,丁腈橡胶在老化速率是热空气老化的2倍左右,且燃气气氛下的加速老化使用时间的预测结果与实际的偏差在±20%之内。     

引红济石调水工程地质特点及应对措施

陕西引红济石调水工程地质条件非常复杂,施工过程中多次出现断层破碎带塌方、突发性涌水、涌泥等地质难题。结合施工采用的方法、措施分析、研究地质特性和规律,总结施工过程中发生地质灾害的经验教训,认为可以通过加强施工过程控制来有效降低隧洞施工地质风险和灾害发生的可能,从而达到加快工程建设进度,节约工程投资的目的。     

Engineering practice of reducing ground subsidence by grouting into overburden bed-separated and similar model experiment

The subsidence prediction theory under the condition of grouting into bedseparated was developed. Reducing ground subsidence by grouting was carried out on eight fully-mechanized top-coal caving faces, by using the continuous grouting in multiple-layer to obtain experiment results of reducing subsidence under fully mining. The similar material model that can be dismantled under the condition of constant temperature and constant humidity was developed. The model was used to simulate the evolution of overburden bed-separated under such constraints of temperature and humidity, at the same time, and to test the hardening process of similar materials.     

一种新型的适应于MANET的基于移动代理的对等入侵检测系统

移动自组织网络(Mobile Ad hoc Networks,MANET)是一种开放性的媒介系统,从而很容易受到黑客的入侵.提出了一种有效的适应于MANET的入侵检测系统,叫做MAPIDS(Mobile Agent-based Peer-to-peer Intrusion Detection System).该系统一旦发现网络中的可疑行为,就会引发一次集体投票过程,以确定该可疑行为是否是入侵行为,并根据投票结果作出相应的进一步处理.相比于其他同样基于集体决策机制的入侵检测系统,MAPIDS节省了更多的网络带宽和电池能耗,并且该系统不存在稀疏节点问题.     

Measurement involving human perception and interpretation

The measurement of features related to human perception and interpretation is discussed. After a brief review of the historical framework, the state of the art is presented on the basis of the authors’ experience in the field and their participation in related European projects, with development of experiments, and co-ordination activities. Future research needs and challenges are then addressed.     

龙耀路越江隧道通风系统设计

根据龙耀路越江隧道分期实施投入运营的情况,介绍了隧道通风系统设计。接着介绍了通风设备配置情况。最后分析了隧道峒口内环境,经计算,CO浓度均满足设计标准。     

退耕还林对志丹水文站水沙量影响浅析

通过对志丹水文站径流量、输沙量的分析,探讨了退耕还林对志丹水文站水沙量的影响,并对志丹县退耕还林的可持续性等方面提出建立生态补偿机制等,同时得到了沙量、水量变化规律。     

单纵模激光的再生放大

调Ｑ激光器的输出单纵模脉冲经衰减和削波后，被注入到一Ｎｄ∶ＹＬＦ调Ｑ副腔里，注入脉冲能量１．２ｎＪ，放大以后的脉冲能量１．５ｍＪ，增益达１０６；脉宽由６ｎｓ压缩到４．５ｎｓ。实验和理论分析均表明，当注入信号脉宽短于放大器腔来回一周的时间时，副腔对单纵模激光的放大是一种再生放大行为，单纵模激光的再生放大消除了注入锁定中苛刻的腔长匹配要求。     

Azeotrope formation in gasoline–ethanol blends. Part 1 – Impact of nonionic on E10 distillation curve

Blending 10?vol% of ethanol into hydrocarbon base gasoline (HBG) increases significantly the vapour pressure of the blend (E10), and exhibits near-azeotrope behaviour that severely affects the shape of E10 distillation curve. The distillation curves of HBG and E10 fuel blend, were constructed using ASTM D86 distillation data, and the areas under each distillation curve, were calculated through the numerical trapezoid rule (NTR) and calculus definite integration (CDI) methods. Consequently, the area due to azeotrope formation (ADAF), was estimated. In this paper, we present the impact of small concentration of nonionic surfactant on the area under distillation curve (AUDC) of E10 fuel blend and the area due to azeotrope formation (ADAF). Also, the influences of the added surfactant on the volatility criteria of the investigated E10 fuel blend were discussed.