铁矿球团质量评价

近３０年来，随着试验方法的改进，球团质量不断提高。目前，对铁矿产品的主要的要求已由过去强调物理纺度转移到重视冶金性能上来，以致降低了对原来物理能的要求。     

用空气脉动水流BATAC跳汰机回收铁合金废渣中的金属成分

目前在国际市场上铁合金的售价较低，但是，铁合金厂如能从大量废渣中回收金属成分，则可以增加收入。在废渣中的金属含量现冶炼方法和渣堆的年限在3～15％之间。广泛用于选煤和选矿著名的空气脉动水流BATA跳汰机，也可以处理铁合金废渣，生产出能直接销售的金属产品，其生产成本远远低于冶炼的生产成本。KHD公司的BATAC跳汰机，可以从废渣中回收符合某些国际市场要求的金属成分。一个典型的例子是跳汰机可选出废渣含量低于2％的精矿，跳汰机人粒粒度上限是50finn。对跳汰机有一个优化要求，就是尽量回收大于15rum的金属，以达到最好的…     

“G—I”型阀小开度工作稳定性分析及建议

分析了“Ｇ－Ｉ”型调节阀在小开度下工作不稳定的原因，根据２００ＭＷ机调节阀的具体结构情况，提出了相应的解决办法。     

数字控制系统在大功率感应熔化炉变频器中的应用

新的德国 Ｏ Ｔ Ｔ Ｏ Ｊ Ｕ Ｎ Ｋ Ｅ Ｒ 可控硅功率变频器的全数字控制系统，可以实现高达４ 个整流桥，２４ 脉冲整流器和两个独立的逆变器，从而实现 Ｄｕｏ Ｍ ｅｌｔ双炉体供电配置。每个逆变器由多个可控硅并联组成。在这个系统中，每套硬件，软件以及先进的控制方法都运用了状态矢量理论以及模糊控制理论，使感应炉的操作更加可靠和灵活。与标准最高的 Ｊ Ｕ Ｎ Ｋ Ｅ Ｒ 电炉设备相结合，数字控制系统可以为您提供最好也是最先进的 Ｊ Ｕ Ｎ Ｋ Ｅ Ｒ 熔炼技术。     

航天科工集团新型森林灭火弹首飞试验成功

由中国航天科工集团公司贵州航天风华精密设备有限公司研制的新型森林灭火弹在某靶场进行了首次飞行试验,其飞行稳定性、射程、密集度和引信工作情况等性能均符合设计要求,试验取得圆满成功,为该产品后续研发工作的顺利开展奠定了基础。     

Fiber-optic probes with improved excitation and collection efficiency for deep-UV Raman and resonance Raman spectroscopy

The ability of ultraviolet resonance Raman spectroscopy (UVRRS) to determine structural, environmental, and analytical information concerning low-concentration aqueous biomolecules makes it a powerful bioanalytical and biophysical technique. Unfortunately, its utility has been limited by experimental requirements that preclude in situ or in vivo studies in most cases. We have developed the first high-performance fiber-optic probes suitable for long-term use in pulsed UVRRS applications in the deep- UV (DUV, 205-250 nm). The probes incorporate recently developed improved ultraviolet (IUV) fibers that do not exhibit the rapid solarization and throughput decay that previously hampered the use of optical fibers for delivering pulsed, DUV light. A novel 90 degrees mirrored collection geometry is used to overcome the inner-filtering effects that plague flush-probe geometries. The IUV fibers are characterized with respect to their efficacy at transmitting pulsed, DUV laser light, and prototype probes are used to obtain pulsed UVRRS data of aromatic amino acids, proteins, and hormones at low concentrations with 205-240-nm pulsed excitation. Efficient probe geometries and fabrication methods are presented. The performance of the probes in examining resonance-enhanced Raman signals from absorbing chromophores is investigated, and the optimal excitation wavelength is shown to be significantly red-shifted from the maximum of the resonance Raman enhancement profile. Generally applicable procedures for determining optimal experimental conditions are also introduced.