固凝(GT)防水材料在建筑工程中的应用

根据固凝(GT)系列防水材料的技术性能,分析其在寒冷地区屋面工程、厕浴厨房间和地下工程防水设计,以及建(构)筑物的抗冻、抗渗与防护等方面应用时应遵守的技术要点。     

某锡多金属矿石抑硅浮锌试验研究

云南某锡多金属矿矿石中易浮硅质矿物含量高,造成生产上浮选锌的效果很差。为此,对该矿石进行了抑硅浮锌试验研究。试验结果表明,以硫酸铝等作抑制剂、Z-200号作捕收剂,并采用将精选1中矿经扫选后直接排尾的工艺流程,可获得锌精矿锌品位和锌回收率分别为49.51%和85.23%的较好浮锌指标。     

建筑厨、浴、厕房间的固凝(GT)防水设计

在建筑工程设计中,厨房、浴室、厕所的室内防水设计至关重要.固凝(GT)防水材料是一种性能优越、适用范围广的新型高分子防水材料.固凝(GT)防水材料应用于建筑厨、浴、厕等多水房间,能彻底解决渗漏难题.结合固凝(GT)系列材料的特点和适用性,分析了建筑厨、浴、厕房间的固凝(GT)防水设计要点、防水构造做法及施工技术措施.     

An Experimental Study of the Performance Impact of Path-Based DoS Attacks in Wireless Mesh Networks

Wireless mesh networks (WMNs) are considered as cost effective, easily deployable and capable of extending Internet connectivity. However, one of the major challenges in deploying reliable WMNs is preventing their nodes from malicious attacks, which is of particular concern as attacks can severely degrade network performance. When a DoS attack is targeted over an entire communication path, it is called a path-based DoS attack. We study the performance impact of path-based DoS attacks by considering attack intensity, medium errors, physical diversity, collusion and hop count. We setup a wireless mesh testbed and configure a set of experiments to gather realistic measurements, and assess the effects of different factors. We find that medium errors have significant impact on the performance of WMNs when a path-based DoS attack is carried out, and the impact is exacerbated by the MAC layer retransmissions. We show that due to physical diversity, a far attacker can lead to an increased performance degradation than a close-by attacker. Additionally, we demonstrate that the joint impact of two colluding attackers is not as severe as the joint result of individual attacks. We also discuss a strategy to counter path-based DoS attacks which can potentially alleviate the impact of the attack significantly.     

不同产地几种中药材中8种重金属含量分析

采用微波消解ICP-MS电感耦合等离子体质谱法对广西不同产地4种中药材中Pb、Cd、Cr、Cu、As、Hg、S b、Sn等8种重金属的含量分析测定,研究了广西中药重金属空间分布特征及草药中重金属含量状况。结果表明,各元素线性良好,相关系数均>0.9992;相对标准偏差(n=11)≤3.6%;八种重金属元素检出限范围为0.0001～0.003μg/L。研究发现同种药材不同产地的重金属含量差异较大,部分产地金银花中镉含量超标严重,需引起重视。     

碳酸钙形貌对陶瓷膜过滤性能的影响

陶瓷膜进行超细粉体的固液分离时,粉体性质对膜分离性能影响显著.本文通过控制沉淀反应条件,获得了球形、棒状、方形等不同形貌的碳酸钙超细粉体;采用陶瓷膜过滤碳酸钙悬浮液,得到膜孔径与碳酸钙粉体粒径、形貌的匹配关系,球形粉体的膜渗透通量最高,棒状束粉体居中,方形粉体的膜渗透通量最小;膜孔径越大,粉体形貌对通量的影响越大;粉体粒径与膜孔径比值增大,膜通量增大.     

固凝(GT)防水材料在屋面工程中的防水设计

固凝(GT)防水材料是一种性能优越、施工便捷高效的新型高分子防水材料.在建筑屋面防水设计中,固凝(GT)防水材料的推广应用能彻底解决建筑屋面的渗漏难题.结合建筑屋面工程的防水等级及设防要求,分析固凝(GT)防水材料在建筑屋面工程中的防水设计技术措施和防水构造设计要点.     

探讨郑州小户型设计对策

近几年,郑州小户型发展迅速,市场占有率高。由于面积的限制,小户型的设计难免出现一些问题。在分析郑州小户型问题的基础上,提出了几点思考和建议,旨在促进小户型产品的完善和发展。     

注聚见效油井工况影响因素分析及措施研究

胜一区注聚试验明显见效后,随着油井含水的下降,见聚浓度的增加,有杆泵油井泵效下降,回压升高;电泵井产液量下降,吨液耗电量增加。根据聚合物驱油的矿场资料,分析了聚合物驱对举升工艺的影响,并针对存在的问题采取了确定合理沉没度、加药降低油井回压、电泵改抽油机、大泵改小泵和螺杆泵等措施,收到了较好的效果。