管路中有气泡时的水锤计算

有气泡存在时的水锤计算发展了多种模型，其中以Ｅ．Ｂ．怀利所提出的离散模型最省计算时间。由于含气量对水锤有很大影响，而负压波造成的压降会导致溶解在液体中的气体释出。因此在上述模型的基础上提出气体释放——离散模型，认为原来的自由气体及释放出来的气体集中在计算截面上，用特征线法进行计算。计算结果与实验结果作了比较，符合得较好。     

山东朱家庄自然硫矿的成因与煤系地层的关系

本文着重对山东朱家庄自然硫矿床在成因方面与新汶煤田石炭、二迭系地层的关系作了些初步探讨。朱家庄自然硫矿床,赋存于磁新盆地下第三系官二段地层之中,它是一巨型沉积层控矿床。作者认为它在成因方面,不但受蒙山、徂徕主干断层的控制,而且在喜马拉雅山运动的影响下,多次复活,切割基底,沟通了石膏矿床与石炭、二迭系地层的联系,使煤在变质过程中产生的瓦斯以断层为通道进入石膏矿体,与石膏所在地层中的有机质一起作用,将石膏矿还原为硫化氢,再与地下水中的游离氧及煤系地层提供的结合氧作用,氧化为自然硫,它对今后寻找与煤系地层共生的自然硫矿及成因探讨具有一定的意义。     

Dual wavelength erbium-doped fiber laser with a lateral pressure-tuned Hi-Bi fiber Bragg grating

Tunable dual wavelength erbium-doped fiber laser (EDFL) with stable oscillation at room temperature is proposed and demonstrated. This laser utilizes a Bragg grating fabricated in a high birefringence fiber as the wavelength-selective component, and then achieves the stable dual wavelength oscillation by introducing the polarization hole burning effect. Furthermore, by applying lateral strain upon the fiber Bragg grating (FBG), the space of the laser dual wavelengths can be tuned continuously.     

高温催化燃烧技术及其核催化剂的研制

高温催化燃烧技术作为一项环境友好的能源利用方式下得到世界各国的广泛重视,催化燃烧器设计与燃烧催华化剂研制领域不断取得新进展。本文通过考察负载型Pd催化剂和烧绿石型复氧化物催化剂的物化学特性与催化反应动力学特征,探讨了改良现有催化剂体系反应性能的有效途径。     

图书馆联盟建设探讨

阐述了图书馆联盟的含义、类型、作用及意义,提出了图书馆联盟建设的策略,指出图书馆联盟是实现资源共享的重要途径。     

混凝土工程事故防范与质量控制浅析

自从1824年波特兰水泥获得专利之后,各种水泥混凝土陆续问世。在现代社会,混凝土广泛用于各种工程建设项目,是目前我国乃至世界上用量最大的建筑结构材料。但混凝土工程的质量,关系到建筑物及构筑物的结构安全,关系到千家万户的生命财产安全。混凝土工程事故防范与质量控制就显得格外重要。     

带宽调制型单光纤光栅温变无补偿位移传感

报道了利用反射谱带宽调制和光强差分探测技术实现单一光纤光栅温变无补偿位移精确测量的新方法。设计了一种结构新颖的曲臂梁位移传感装置,结合光波导理论与材料力学原理分析了光纤光栅在高斯应变作用下光栅反射谱侧向梯度展宽的成因,理论推导了特殊结构梁在外力作用下光栅反射谱带宽/反射光强与压力之间的响应关系。光栅反射谱侧向梯度展宽的同时反射光强线性增加,利用光强差分检测方法消除光源出光抖动的影响,提高了位移测量精度。基于带宽调制的光纤光栅位移传感方法免受温度变化的影响,在-10℃~80℃的温度变化范围内,测量误差小于1.2%,实现了单光纤光栅温变无补偿位移测量。     

Realization of an All-Fibre Self-Organization Intra-Cavity Coherent Erbium-Doped Fibre Laser

An intra-cavity coherent coupling Michelson Er-doped fibre （EDF） laser （MCEDFL） is proposed and demonstrated. Characteristics of the MCEDFL are investigated. It is found that the MCEDFL with a polarizer can be coherent combined effectively. By the experiment based on fibre Bragg gratings （FBGs） with different reflectivity, we find that the reflectivity of the FBG play a vital role in improving the performance of the MCEDFL. This outcome adequately shows many favourable features, such as high efficiency, easy operation, and simple all-fibre configuration.     

Transmission Properties of W3 Y-Branch Filters in Two-Dimensional Photonic Crystal Slabs

A highly efficient W3 Y-branch filter in a two-dimensional photonic crystal slab with triangular lattice of air holes is designed and fabricated, and its transmission properties are measured. By accurately adjusting the size of the resonant cavities, the minimum wavelength spacing of 7 nm between two channels is realized. The corresponding resonant wavelengths of the two cavities agree well with the calculated ones. This implies that this kind of fiIter may be promising in integrated wavelength division multiplexing system.