催化装置MIP改造后反应温度波动原因分析及改进

针对青岛石油化工有限公司1.4 Mt/a重油催化裂化装置MIP技术改造后提升管第一反应区温度大幅波动的问题，对催化剂性质及再生催化剂流化状况进行分析，通过采取提高第二再生器床层料位高度、改进松动位置及松动风量的措施来改善大密度催化剂的流化状况。采取改进措施后，再生滑阀压降波动范围明显降低，反应温度大幅波动现象消失，总液体收率较改进前增加了0.85个百分点。     

抗氧化酶促防御系统对白皮松幼苗抗寒性的影响

针对土壤农化分析课的特点,提出了提高该课教师自身的知识修养和实验操作能力具体措施;同时,详细地阐述了土壤农化分析课理论及实验课的授课方式.     

液压系统压力故障的诊断与排除

介绍液压系统压力故障的诊断及排除方法，重点介绍液压泵，溢流阈，减压 及其它原因引起的故障，对其进行诊断并提出排除的方法。     

Use of a microwave cavity for sensing dielectric properties ofarbitrarily shaped biological objects

A rectangular waveguide resonator operating in the H₁₀₅ mode at 3.2 GHz is used in determining the change in resonant frequency, ΔF, and the Q factor of the cavity, ΔT , when measured with and without single corn kernels of various shapes and dimensions. By measuring those variables for a kernel oriented in two positions differing by a 90° rotation with respect to the maximum E-field vector, the average values of ΔF and ΔT are found to be independent of shape. The ratio ΔF/ΔT is independent of size and is a function of the material properties (ε'-1)/ε". This function is shown to be related to the material density, moisture content, or other characteristics when all other properties except the one selected remain unchanged     

宽带IP城域网及其应用

文章结合南京电信公众宽带IP城域网的建设，对宽带IP城域网的网络结构、用户接入安全、网络管理和认证计费作了阐述，并简要介绍了应用于宽带IP城域网上的一些业务。     

QQF函数数值计算及图示软件

QQF 软件可以建立不限容量的函数(公式)库,计算和图示库中任一函数在指定范围的数值,并在二维或三维空间显示该函数的图象。软件中使用了特殊的编译技巧,用户能直接以人机对话方式建立和维护自己的函数库,方便地调用其中任何函数。QQF.EXE 可在 IBM—PC及其兼容机上运行。     

Model investigations on the penetration of melts into injection nozzles

The formation of gas bubbles and the penetration behaviour of the liquid into the nozzle against the gas stream were studied in water, water-glycerine mixtures and mercury from bubbling regions to a continuous gas jet region with various nozzle configuration. Measurements were also made with gas and powder injection in the mercury and molten pig iron models. It was observed that the penetration behaviour of the liquids during gas injection depends on the gas flow velocity, the diameter and orientation of the nozzle, the wettability and the density of the liquid. The results of the powder injection showed a lower penetration depth of the liquid into the nozzle than the results for gas only injections. The effect of each influencing factor on the penetration behaviour was shown to be similar in both injection types, with or without powder.     

The effect of non-Gaussian local wind pressures on a side face of a square building

An accurate probabilistic representation of input forces and structural response in the extreme region is essential for the assurance of the safety and reliability of structures subjected to environmental loads. When the loads differ significantly from the Gaussian, they may increase expected damage. The design loads of a cladding glass subjected to the local wind pressures must not exceed the allowable load of a glass panel. The design loads of a cladding glass can be dependent on whether the local wind pressures have a non-Gaussian or Gaussian distribution. In this study, comparing non-Gaussian local wind pressures with Gaussian local wind pressures, and comparing the equivalent 1-min loads of cladding glass subjected to the simulated non-Gaussian local wind pressures with those of cladding glass subjected to the simulated Gaussian local wind pressures are performed to investigate the effect of non-Gaussian local wind pressures on a side face of a square building.     

地层压力剖面在复杂井钻探中的应用

为保证复杂探井的顺利钻进,更好地保护油气层,在钻前进行地层3项压力(地层孔隙压力、坍塌压力和破裂压力)剖面的预测非常重要.利用邻井测井资料、钻井工程资料对大港油田南大港潜山构造带歧南9X1、歧南9X2等井,在钻前进行了地层3项压力预测.根据该地区进入油气层段前地层坍塌压力较高,而进入油气层后地层坍塌压力下降,同时油层孔隙压力较低的实际情况,采用了一套与传统井身结构设计完全不同的设计方式,虽然增加了一定的套管成本,却保证了钻井施工的顺利进行,有效保护了油气层,与邻井相比,产量大幅度提高.     

PERFORMANCE OF MULTIUSER DETECTION FOR CDMA SYSTEM IN A FLAT RAYLEIGH FADING ENVIRONMENT

In a CDMA communication network using conventional signal detection, system capacity is limited and its performance is degraded by the multi-access interference (MAI). Multiuser detection, which makes use of cross-correlation information between spread spectrum codes, can reduce or eliminate the MAI in a Gaussian channel so as to mitigate the near-far effects and increase the system capacity. This paper extends the multiuser detector to a flat Rayleigh fading CDMA environment, and discusses the bit error rate of typical multiuser detection algorithms in such a environment by combining theoretical analysis and computer simulation. It is shown that multiuser detection is superior to conventional detections in the flat Rayleigh fading channels.