Molecular Diffusion Coefficients of Organic Compounds in Water at Different Temperatures

Molecular (or tracer) diffusion coefficient data were obtained for 2-naphthol, benzoic acid, salicylic acid, camphor, and cinnamic acid in water at temperatures that differ significantly from ambient value. Experimental values were determined for the dissolution of 2-naphthol in water at 283 to 368 K, of benzoic acid in water at 283 to 338 K, of salicylic acid in water at 283 to 343 K, of camphor in water at 283 to 318 K, and of cinnamic acid in water at 283 to 318 K. Empirical correlations are presented for the prediction of molecular diffusion coefficient over the entire range of temperatures studied, and they are shown to predict the obtained data with very good accuracy.     

川东二叠系生物礁油气藏的地震勘探技术

 生物礁油气藏是一种特殊的岩性油气藏，由于其地质特点的多样性和复杂性，使得生物礁的地震勘探难度很大。本文针对川东地区二叠系生物礁的地质特点和资料情况，以生物礁气藏为研究对象，从已知井井震响应特征分析出发，通过地震反射结构分析、神经网络波形分类处理、地震属性分析、三维可视化解释、多参数地震反演等多项地震特殊处理和解释方法，建立了生物礁和生物礁储层的判别模式，形成了有针对性的地震勘探配套技术。其中以伽马、补偿中子及声波为目标曲线的多参数地震反演技术对于预测和评价生物礁特别有效。     

三相四线制有源滤波器的新型无差拍控制

建立了三相四线制有源滤波器的完整数学模型。针对三相四线制有源滤波器，提出了一种基于重复预测型谐波电流观测器的新型无差拍控制方案，以改善有源滤波器的动态性能。详细阐述了新型无差拍控制的原理、控制系统的离散化模型、重复预测型谐波电流观测器的工作原理及保证其稳定工作的充分条件。基于MATLAB/Simulink的有源滤波器控制系统仿真分析表明，所提出的新型无差拍控制方案在保证系统稳态精度良好的同时有效改善了系统的动态响应。     

利用天然地震震源点确定活动断裂深部延伸性状的尝试

本文首先运用卫星影像,对临汾—运城盆地中主要活动断层的平面展布状况进行了解译。在此基础上,利用天然地震震源点的三维生标,探索性地研究与确定了各条断层的深部延伸性状,建立起了盆地内断裂构造的三维格架。主要结论有:(1)边缘断裂多数是深达莫霍面的(38km)伸展性铲形断裂;(2)霍山西麓山前大断裂的深部延伸为直立状,深度达莫霍面(38km)。(3)盆地内的其它断层多数是铲形断层的对偶断层,产状为倾斜状,与铲形断层相遇后而终止,延伸深度一般不超过30km;(4)区内存在4个水平滑脱面(或层),其深度分别为4.5～5.5km,9.5～10.5km,18.5～20.5km,35.5～37.5km,这些面(或层上)震源点分布较密集;(5)区内北部、中部、南部,断层组合形式稍有差别,并控制、形成了不同的地貌形态。     

A novel compact low-power direct conversion receiver for mobile UHF RFID reader

A novel direct conversion receiver with low cost and low power is implemented in a 0.18 μm 1P6M standard CMOS process for a Mobile UHF RFID reader.A highly linear active mixer with low flicker noise and low noise active load is proposed.An efficient and low cost on-chip DC offset voltage canceling scheme is adopted with a high-input-impedance four-input OPAMP to buffer the output of the DC offset canceller(DCOC) block.The receiver has a measured input 1 dB compression point of 2 dBm and a sensitivity of 72 dBm in the presence of the large leakage signal from the transmitter.Only occupying a silicon area of 2.5 mm 2 and consuming 21 mA from a 1.8 V supply,the receiver makes the mobile UHF RFID reader to communicate with a transponder in a distance of 1 m conveniently.     

车辆悬架用电磁执行器的建模与试验研究

应用电磁感应的基本原理,设计了一种新型的车辆主动悬架用电磁直线执行器,该执行器具有响应快,出力大和动行程大的特点。通过两种不同的建模手段,即有限元建模和集总元件动力学建模的电磁力仿真对比分析,两者基本吻合,表明了执行器模型的准确性。利用所建立的有限元模型,研究了执行器结构参数如气隙厚度和次级铜层厚度对电磁力的影响规律,并选取合理的参数进行执行器的样件试制。通过对加工后的样机模型进行电磁力响应的试验测试,并分别与有限元模型和集总元件动力学数学模型进行相应的比较,试验数据与仿真结果基本一致,进一步验证了模型的准确性。     

利用RSS推送的主动服务解决藏书呆滞的研究

将通过系统提取的读者兴趣及需求信息与不断更新的RSS资源库进行比对,筛选出最能满足用户要求的RSS信息,并通过RSS主动推送技术,将资源及时发送给读者,是提高馆藏图书利用率,减少图书呆滞量的一种有效途径。     

Multi-indicator Active Queue Management Method

A considerable number of applications are running over IP networks. This increased the contention on the network resource, which ultimately results in congestion. Active queue management (AQM) aims to reduce the serious consequences of network congestion in the router buffer and its negative effects on network performance. AQM methods implement different techniques in accordance with congestion indicators, such as queue length and average queue length. The performance of the network is evaluated using delay, loss, and throughput. The gap between congestion indicators and network performance measurements leads to the decline in network performance. In this study, delay and loss predictions are used as congestion indicators in a novel stochastic approach for AQM. The proposed method estimates the congestion in the router buffer and then uses the indicators to calculate the dropping probability, which is responsible for managing the router buffer. The experimental results, based on two sets of experiments, have shown that the proposed method outperformed the existing benchmark algorithms including RED, ERED and BLUE algorithms. For instance, in the first experiment, the proposed method resides in the third-place in terms of delay when compared to the benchmark algorithms. In addition, the proposed method outperformed the benchmark algorithms in terms of packet loss, packet dropping, and packet retransmission. Overall, the proposed method outperformed the benchmark algorithms because it preserves packet loss while maintaining reasonable queuing delay.