新型建筑材料实验教学模式设计与实践

以内容新、材料新、工艺新、绿色化、人性化的教学模式设计理念,彰显当代大学生实验教学模式的改革与创新。通过对四届毕业生学生授课实践,教学效果良好。     

Integration of flocculation and adsorptive immobilization of Pseudomonas delafieldii R‐8 for diesel oil biodesulfurization

BACKGROUND: Deep desulfurization of hydrocarbon fuels is receiving increasing worldwide attention because of the increasingly stringent regulations to meet the requirement of environmental protection. Biodesulfurization (BDS) is being explored as either an alternative or complementary process to the conventional oil refining technologies. The whole cell immobilization technique is of great importance for accelerating the industrialization of BDS. An effective technique for a BDS process employing flocculation and integration with immobilization was developed. RESULTS: Pseudomonas delafieldii R‐8 cells were successfully flocculated and immobilized by directly adding chitosan and celite into the culture broth. The one‐step immobilized R‐8 cells exhibited good catalytic activity and retained at least 85% activity after six cycles of repeated‐batch desulfurization. Extensive biodesulfurization of diesel oil resulted in 82% reduction of total sulfur from 123 to 22 µg g^?1 in 24 h. CONCLUSIONS: A novel and simple technique was developed using chitosan flocculation and integration with cell immobilization onto celite for dibenzothiophene BDS. The present report indicates that integration of flocculation and immobilization may provide a continuous and efficient method of BDS. Copyright © 2010 Society of Chemical Industry     

一种用于焊缝打磨的多功能小型磨挫机头设计

锅炉行业现有直径850 mm、厚度80 mm的钢管内侧进行焊缝清根及打磨作业过程中,由于钢管内空间较小,导致自动化磨挫机头无法进入,只能通过人工手持打磨机完成清根打磨工作,人工打磨作业存在作业环境恶劣、作业质量不高、作业效率低下等诸多问题,急需一款能在直径850 mm管内完成自动化作业的小型磨挫机头.通过三维建模对磨挫...     

对向靶溅射TiN薄膜的结构和物性

利用对向靶溅射（ＦＴＳ）沉积出（１１１）择优取向的单相ＴｉＮ膜，膜硬度（ＨＶ）最高可达３８００，择优取向随基板偏压增高，可由（１１１）转向（２００），晶格常数随氮气分压增高而增大，这是氮原子进入四面体间隙引起的。     

一种基于USB 2.0的实时数据采集系统设计与实现

结合当前实时数据采集系统面临的问题和USB总线的突出优点,提出了一种基于USB 2.0总线技术的实时数据采集系统的设计及具体实现方法.根据要设计的系统的要求,给出了硬件电路框图,通过比较,选取了A/D芯片和USB通信接口芯片,并对Cypress公司的EZ-USB FX2芯片做了简单介绍.围绕EZ-USB FX2芯片,进行系统软件包括固件程序、设备驱动程序和应用软件的开发设计,详细介绍了设备固件程序的设计,给出了流程图和主要的代码.并对基于USB总线的数据采集系统的未来发展做了展望.     

铁磁谐振的发生对电压互感器的危害及其预防

针对电力系统中基频谐振，分频谐振对电压互感器造成的危害，分析了铁磁谐振产生的原因，提出了合理的预防措施。     

MATS: multichannel time-spread scheduling in mobile ad hoc networks

Wireless mobile ad hoc networks (MANETs) have received considerable attention in the last few years. Most research works focus on single-channel MANETs with a single power-level in order to simplify the network design and analysis. How to take advantage of multiple channels and multiple power levels in MANETs poses a serious challenging problem. Recently, a few multichannel transmission protocols such as collision-avoidance transmission scheduling (CATS) have been proposed to harvest the advantage of high transmission efficiency when multiple channels are deployed. Although such protocols do provide ways to coordinate the use of multiple channels, there exist some serious problems such as the throughput fast drop-off under heavy traffic loads. In this paper, we propose a new protocol, namely, multichannel time-spread scheduling (MATS), which attempts to tackle these problems. In MATS, nodes with transmission requests are divided into three groups, which carry out channel reservations in parallel and can simultaneously support unicasting, multicasting and broadcasting at the link level. MATS ensures successful and collision-free data transmissions using the reserved channels and allows multicasting and broadcasting high priorities over unicasting. Both theoretical analysis and extensive simulation studies are carried out which show that the performance of MATS under high traffic loads significantly outperforms the existing schemes.