污染少了 效益增了

去年年初,抚顺石化公司石油三厂催化水场投用了环保型滤芯自动反冲洗式水质过滤系统。提高了装置循环水的处理效果,减少了生产装置的排污量。从去年初至今年3月末, 这个厂共节水12万吨。降低供水成本43万元。环保型过滤系统场投用以来,过滤过程已完全实现了自动化调控,改变了以往过滤系统用人工清洗滤料而排放大量     

降伏“电老虎”

一直以来,南充炼化总厂生产的微晶蜡、地石蜡产品质量在国内处于领先地位,占据国内市场份额的1／3左右,产品畅销朝鲜及东南亚一些国家和地区。其中,85号微晶蜡还是解放军总装备部指定产品之一。     

Design of a fiber polarizer based on an asymmetric dual-core photonic crystal fiber

We propose a novel optical polarizer based on an asymmetric dual-core photonic crystal fiber(PCF) with triangular lattice air-holes.The fiber is designed as that the effective indices of modes in the two cores are matched at one polarized state but mismatched at another polarized state.As a result,one of the polarization states is coupled to the other core and transferred into a high-order mode.The transmission properties of the polarizer are investigated by the semi-vectorial beam propagation method(SV-BPM...     

多元LDPC码与二元LDPC码的性能分析

为了比较多元LDPC码与二元LDPC码的性能,文章从校验矩阵、Tanner图、BP译码算法等方面将两者进行有效的分析,并结合具体的Monte Carlo仿真实验,得出多元LDPC码的性能确实优于等长度码长的二元LDPC码.     

Design of a Surface-Plasmon-Resonance Sensor Based on a Microstructured Optical Fiber with Annular-Shaped Holes

A novel design is proposed for highly sensitive surface-plasmon-resonance sensors. The sensor is based on a microstructured optical fiber with two layers of annular-shaped holes. A gold layer is deposited on the inner surface of the second hole-layer, in which the holes have several micrometers thickness in size, facilitating analyte infiltration and metal layer deposition. In the first layer of holes, the sector-ring~shaped arms, used as supporting strips, are utilized to tune the resonance depth of the sensor. Numerical results indicate that the sensor operation wavelength can be tuned across the C＋L-band. The spectral sensitivity of 1.0.104 nm. RIU-1 order of magnitude and a detection limit of 1.0.10-4 RIU order are demonstrated over a wide range of analyte refractive index from 1.320 to 1.335.     

环形结构塑料光子晶体光纤色散特性分析

利用有限差分光束传播法模拟了光波在环形结构塑料光子晶体光纤内的传输情况,讨论了基模有效折射率与光纤结构的关系,并分析了色散特性随孔间距、孔大小变化的一般规律,发现塑料光子晶体光纤的总色散主要来自材料色散,尤其在短波长范围内材料色散更是居于主导地位,但随波长的增大波导色散逐渐增大,可以设计零色散波长位于可见光波段的塑料光子晶体光纤,此光纤也能很好地应用到非线性领域.     

网络安全设计方案初探

计算机网络的发展,加快了社会信息化的进程,同时也带来了许多网络安全问题,因此,在开展网络应用时,加强网络的安全保障显得越来越重要。本文就如何保障网络安全所采取的网络安全设计方案进行探讨。     

双向超长混凝土结构无缝设计温度场的建立及技术措施研究

通过对沈阳地区气温的长期实地观测,建立了超长混凝土结构的整体温度场,解决了超长混凝土结构无缝设计的技术难点,为后续工程积累了宝贵经验;结合沈阳恒隆中街广场项目,基于该温度场对结构进行了温度效应模型分析,提出了防止温度应力作用引起的结构变形和裂缝等各项保障技术措施。结果表明:所建立的温度场和提出的技术措施是有效的,该建筑在使用中未出现因超长引起的裂缝。     

A fixed frequency fast transient response DC-DC controller for VRM application Chen Mingyang(陈明阳), Zhao Menglian*(赵梦恋), Wu Xiaobo(吴晓波)

A 2V-10A fast transient response DC-DC buck controller based on fixed frequency hysteresis control is presented. A carefully designed output voltage filter detects the output capacitor current change which helps the controller to respond immediately after load changes. Adaptive hysteresis control guarantees the switching frequency to be the same as the reference frequency by using a CCII-composed circuit and current mirrors. The controller is designed and fabricated in a TSMC 0.35 μm process. Simulation and test results show that this con- troller achieves a 20 μs settling time in one single switching cycle when load current changes from 1 A to the full load condition at 10 A.     

井用管线下井有了“机械手”

近日,胜利油田采油院浅海所研制的一项“井用管线导向器”装置正式获得国家发明专利授权．．该发明中的一种油气水井井口管线入井导向装置,就像一只“机械手”。它的问世,取代了以往通过人工拉紧管线定位、人工扶正油管等步骤。