国内废纸造纸废水处理技术新发展

论述了以废纸为原料的造纸厂废水的发生量、污染特征 ,阐述了近年来国内大型造纸厂建造的废纸废水处理工程的典型流程 ,提出了中小型造纸厂处理废纸废水的技术对策 ,指出中国废纸造纸工业已初露废水零排放的曙光。     

Effect of humidity and temperature on the adhesive strength of pressure sensitive adhesives

This paper reports the effect of humidity and temperature on the adhesive strength of a pressure sensitive adhesive (Flexbond 150) used to bond Mylar films. It has been found that, ill general, the adhesive strength decreases significantly with an increase in temperature. The effect of humidity on the bonding strength, however, was found to be process dependent. The sample preparation conditions, e.g., press weight for the bonding and the press time, are important in determining the humidity effect. The water sorption isotherm A 24°C for the adhesive was also determined. The amount of water sorbed by the adhesive at 95 percent relative pressure was found to be less than one weight percent.     

Experiments and simulations of the ballistic response of ceramic composite armors

Journal of Mechanical Science and Technology - A lightweight multilayer ceramic composite armor with a sandwich structure back plate was proposed by studying the penetration process, damage...     

基于贝叶斯方法无损识别20钢高温时效状态

以 2 0钢高温时效组织形态为研究对象 ,依据贝叶斯判别原则 ,通过评价超声回波信号特征参数 ,建立样品分类识别判据 ,以待测样品的特征信息验证判据的可靠性 ,有效识别率不低于90 %。     

Discrimination of breast cancer by measuring prostate-specific antigen levels in women's serum

Prostate-specific antigen (PSA) has been reported to be a potential biomarker of breast cancer. Serum PSA of normal women is around 1 pg/mL, which is usually undetectable by current assay methods; thus an ultrasensitive measurement of PSA expression in women's serum is necessary to distinguish normal from malignant breast diseases. To enhance the sensitivity of conventional immunoassay technology for the detection of PSA in sera, we adopted a localized surface plasmon coupled fluorescence fiber-optic biosensor, which combines a sandwich immunoassay with the localized surface plasmon technique. The concentration of total PSA (t-PSA) (from 0.1 to 1000 pg/mL) in phosphate-buffered saline solution and the normalized fluorescence signal exhibit a linear relationship where the correlation coefficient is 0.9574. In addition, the concentration of additional t-PSA in 10-fold-diluted healthly women's serum across a similar range was measured. The correlation coefficient for this measurement is 0.9142. In clinical serum samples, moreover, the experimental results of t-PSA detection show that both the mean value and median of normalized fluorescence signals in the breast cancer group (155.2 and 145.7, respectively) are higher than those in the noncancer group (46.6 and 37.1, respectively). We also examined the receiver operating characteristic curve for t-PSA, and the area under the curve (AUC) is estimated to be 0.9063, the AUC being used to measure the performance of a test to correctly identify diseased and nondiseased subjects.     

A 1.2-V 0.25-/spl mu/m clock output pixel architecture with wide dynamic range and self-offset cancellation

A 10T/pixel CMOS digital pixel sensor with clock count output, ultra low supply voltage, and wide dynamic range is presented. The pixel fabricated by a standard 0.25-/spl mu/m CMOS logic process comprises a reset transistor, a photo-diode, a comparator, and an inverter with pixel size of 9.4/spl times/9.4 /spl mu/m/sup 2/ and 24% fill factor. The amplified logarithmic output response similar to the light response of human eye is demonstrated in this work. The pixel can operate at a supply voltage as low as 1.2 V without affecting its output characteristics. The dynamic range of this cell limited by either the subsequent analog-to-digital circuit resolution or the rising and falling time of output clock is higher than 90 dB with an 8-bit resolution.     

Deterministic global optimization approach to steady-state distribution gas pipeline networks

Natural gas is normally transported through a vast network of pipelines. A pipeline network is generally established either to transmit gas at high pressure from coastal supplies to regional demand points (transmission network) or to distribute gas to consumers at low pressure from the regional demand points (distribution network). In this study, the distribution network is considered. The distribution network differs from the transmission one in a number of ways. Pipes involved in a distribution network are often much smaller and the network is simpler, having no valves, compressors or nozzles. In this paper, we propose the problem of minimizing the cost of pipelines incurred by driving the gas in a distribute non-linear network under steady-state assumptions. In particular, the decision variables include the length of the pipes’ diameter, pressure drops at each node of the network, and mass flow rate at each pipeline leg. We establish a mathematical optimization model of this problem, and then present a global approach, which is based on the GOP primal-relaxed dual decomposition method presented by Visweswaran and Floudas (Global optimization in engineering design. Kluwer book series in nonconvex optimization and its applications. Kluwer, Netherlands, 1996), to the optimization model. Finally, results from application of the approach to data from gas company are presented.     

噪声数据压缩器检测平台的PCM解码实现

为了提高数据的精度,便于收发端进行数据加工和处理、适应数字技术和大规模集成技术的飞速发展,研究了脉冲编码调制方式PCM（Pulse Code Modulation）。主要对噪声数据压缩器实时下传的PCM码进行解码,通过上位机读出数据进行测试,完成对系统进行功能验证。重点在硬件的功能实现上对其进行阐述,通过试验准确地接收到数据,实现PCM码流解码,从而证明本设计方案切实可行。     

普光气田飞仙关组地震反射系数特征及应用

普光气田是川东北地区最大的气藏之一,是一个受构造和岩性控制的复合圈闭气藏。通过对飞仙关组气藏的岩石学特征、地震反射系数变化特征以及地震响应特征等方面的研究,分析认为飞仙关组一、二段(T1f1-2)储集层物性较好,其地震反射系数比飞三段(T1f3)变化大,"亮点"和"暗点"反射特征表现明显,通过运用地震反射特征进行气田井位部署,应用后取得了较好的效果。     

Tiered bandwidth reservation scheme for multimedia wireless networks

It is important to provide quality of service (QoS) guarantees if we want to support multimedia applications over wireless networks. In this paper, considering the features of tiering in sectored cellular networks, we propose a novel scheme for bandwidth reservation to approach QoS provisioning. By predicting the movement of each connection, the reserving of bandwidth is only required in needful neighboring cells instead of in all neighboring cells. In addition, an admission control mechanism incorporated with bandwidth borrowing assists in distributing scarce wireless bandwidth in more adaptive way. Through mathematical analysis, we proof the advantages of tier‐based approach and the bound for the selection of tiered boundary. The simulation results also verify that our scheme can achieve superior performance than traditional schemes regarding no bandwidth reserving, fixed bandwidth reserving, and bandwidth borrowing in sectored cellular networks when performance metrics are measured in terms of the connection dropping probability (CDP), connection blocking probability (CBP), and bandwidth utilization (BU). Copyright © 2008 John Wiley & Sons, Ltd.