试论微波加热在木材干燥加工中的应用

阐述了微波加热木材在木材加工中的原理和特性,分析了微波干燥木材的机理和优点,介绍了微波加热技术研究与应用情况,展望了微波干燥木材的应用前景。     

超临界流体干燥半工业化在氧化铝粉体制备上的应用

醇洗后的拟薄水软铝石(Al2O3·XH2O)的醇凝胶,采取超临界流体干燥处理技术制得了超细氧化铝粉体。采用透射电镜对试验粉体粒子的大小和分散度进行了表征,结果表明:在260℃×7MPa×1h.的超临界流体条件下,得到平均粒度小于10nm,高的比表面积的纤维状Al2O3粉体。有效地改善了粉体的团聚程度。     

Preparation of 3-D porous fibroin scaffolds by freeze drying with treatment of methanol solutions

In this study, silk scaffolds with appropriate porous structures were prepared by adjusting solution concentrations and providing treatment with methanol solutions in the way of freeze drying. The effects of the preparation conditions on the microstructures and properties of the scaffolds were discussed. Fibroin solutions with different concentrations of 4, 6, 8, 10 wt% were used respectively to prepare the scaffolds. The effects of the addition of 20 vol% methanol before or after freeze drying to the 4 wt% fibroin solution were investigated. As demonstrated by Scanning Electron Microscope (SEM), the fib-roin scaffolds prepared without methanol had porous microstructures composed of thin sheets, and the sizes of the pores decreased with the increase of the fibroin solution concentrations, while the scaffolds prepared in the presence of methanol showed porous microstructures formed by fine-particle aggregates. The porosities and mechanical properties of the prepared fibroin scaffolds under different conditions were tested. The crystalline structures and conformations of the fibroin scaffolds were detected by Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD).     

宁强县生猪存栏下降原因及对策

素有“养猪大县”之称的宁强县，辖26个乡镇305个村，总人口33万人，其中农户有7．5万户，农业人口29．57万人。2004年以来，县委县政府把“生猪、茶叶、中药材”确定为三大主导产业，使全县生猪养殖向专业化、规模化、效益化迈进，生猪出栏迅速增长，曾出现过产销两旺的历史；但今年开春以来，     

焚烧炉中单元垃圾干燥过程的试验研究

通过在马弗炉内以及循环流化床内对单元垃圾（土豆块）进行干燥试验，分别获得了其在炉内的干燥特性曲线．试验结果显示，在马弗炉内低温区干燥温度对垃圾干燥过程的影响较大；在同一干燥温度下，随着垃圾厚度的增加，干燥时间近似呈指数形式增加；在干燥的大部分阶段，土豆块内温度随含湿量减少呈逐渐上升趋势．在循环流化床内，土豆块的整个干燥过程中只有降速段，而不存在恒速段和初始段，垃圾厚度对干燥过程有显著影响．     

Study on seal improvement and rotor thrust control of centrifugal compressor

Fluid pressure variations due to process fluctuations or balance drum seal degradation can result in rotor thrust increasing that may jeopardize thrust bearing and compressor’s reliability. Also, the leakage flow through balance drum seal can seriously affect the efficiency of compressor. A method that can improve both the efficiency and reliability of centrifugal compressor is presented. The method focused on rotor thrust control and balance drum seal upgrading. The low leakage feature of Dry-Gas-Seal（DGS）, high reliability of labyrinth, and the feasibility of upgrading existing structure are taken into account at the same time to design a combined labyrinth-dry gas seal system on the balancing drum. Based on the combined seal system, a Fault Self-Recovering（FSR） system for the fault of rotor shaft displacement is introduced to assure the safety and reliability of centrifugal compressor. The modern Computational Fluid Dynamics（CFD） is used to validate this envision. The numerical result and relevant information indicate that the combined sealing system could improve the efficiency of the centrifugal compressor by about 4%.     

种好中药材需要注意六个问题

合理种植中药材可以发家致富，但由于各种原因导致收益不理想，甚至赔钱的人也不少。到底是哪些问题是药农朋友们致富之路上的障碍呢？笔者结合河北安国市中药材研究协会工作中遇到的实际情况和经验，认为以下几个问题对药农朋友较为重要，现总结如下：     

继承挖掘中医药宝库 妙药灵济人类健康——汉中灵济堂生物科技有限公司

汉中灵济堂生物科技有限公司位于张骞故里城固县江湾村，地处县城近郊，交通十分方便。公司是集中药材规范化种植、临床医疗、保健品开发、生产、销售为一体的民营高科技企业。下属灵济动植物中药材开发研究所、灵济肝胆病专科医院、灵济中药材规范化种植基地（占地5000亩）、灵济食药用菌种厂及灵济中药保健品研发中心五个企业。     

杜仲树皮生长理论及剥皮再生技术

介绍杜仲树皮次生生长过程及大面积剥皮再生新皮的起源、形成过程和树体生理反应。探讨影响仁仲剥皮再生的环境因子和加速剥皮再生，提高成海活率的主要技术措施。     

杜仲剥皮方法

杜仲是一种名贵的中药材，早期都是伐树取皮药用。自上世纪七十年代末至八十年代初期，由于杜仲药材奇缺引起人们对杜仲剥皮的研究，随后形成了一个研究高潮。