浅谈基于Struts和Hibernate的框架整合应用

本文介绍了Struts和Hibernate两个开源框架,提出了基于这两种框架的集成架构,给出了该架构的工作流程,并结合实例说明如何利用集成架构进行开发。     

二步精炼法生产低磷中碳锰铁的技术研究

重点研究了利用高碳高磷的低品位锰硅合金不合格品生产低磷中碳锰铁的生产技术。着重进行了复合精炼剂加入量对脱磷、脱碳及脱硫效果影响的试验和脱硅精炼的技术研究，取得较好的效果。     

磁浮列车用铜基受电靴滑块材料的研究

研究了一种新型Cu-Sn-Pb-Cr-C受电靴滑块材料,并进行了性能测定和组织观察.结果表明:受电靴滑块材料具有优良的综合性能,其抗拉强度为138.1MPa,断口局部范围内有韧断特征;摩擦系数为0.38,其摩擦性能大大优于纯Cu;材料的电导率可达74%IACS,明显高于纯Al(60%IACS).从其微观结构可以发现,试样材料中Cu基体以连续网状形式分布,加入的石墨比较均匀地分布在网络空隙内,充分发挥了材料的导电性能及石墨的自润滑性能.     

EM>N-/EM>琥珀酰亚胺-3-碘［S

研究能有效降低抗体的体内脱碘的标记方法。碘标记N-琥珀酰亚胺-3-(三正丁基锡)苯甲酸酯(ATE)前体,得到N-琥珀酰亚胺-3-碘[125I]苯甲酸酯(S125IB),分别与人IgG和抗人肝癌单抗(Hepama-1)进行偶联,探索最佳标记条件,并测定标记物的稳定性和生物活性,研究直接标记和间接标记的Hepama-1在正常小鼠体内的生物学分布。结果表明,用N-氯代琥珀酰亚胺(NCS)法125I标记ATE前体,在ATE用量为25～100μg、NCS用量为10～20μg、磷酸盐缓冲溶液(PBS)用量为10～20μL、反应时间为5 min时,标记率大于95%;S125IB和人IgG的偶联率最高可达75%,偶联产物稳定性、生物活性良好;与Hepama-1偶联率可达75%以上。生物分布的对比实验证明,1,3,4,6-四氯-3α,6α-二苯甘脲(Iodogen)直接标记的Hepama-1在甲状腺的放射性摄取率(脱碘显示)最高是S125IB间接标记的Hepama-1的87.9倍。这说明以ATE为前体的放射性碘间接标记蛋白质方法与传统的碘直接标记方法相比较,在解决体内严重脱碘问题上具有明显的优越性。     

认知无线电的关键技术和应用研究

认知无线电是一种新的智能无线电技术,它通过动态的接入频谱为用户提供高容量的服务,能极大的改善现有的低效的频谱利用率。文章重点分析了认知无线电中频谱检测、频谱管理、功率控制等关键技术,以及认知无线电在超宽带、Mesh网、无线区域网的应用现状,最后探讨了认知无线电发展需要关注的难点问题。     

Time-of-day Internet-access management by combining empirical data-based pricing with quota-based priority control

An empirical data-based design methodology is proposed for Internet-access management to improve congestion, uneven usage and fairness, especially during peak hours, over a free-of-charge or flat-rate network. The design methodology combines time-of-day pricing (TDP) with quota-based priority control (QPC). Core to the design methodology are the innovations in characterising user demand and quota-allocation behaviour with respect to time and pricing. In-depth analyses of empirical data reveal distinctive behaviour patterns of myopic and prudent quota allocations over time and both patterns indicate high preference for peak-hour access. The user models adopt general utility functions and capture how pricing affects user behaviour as prudent or myopic. Preference parameters of users' utility over time are then estimated by collecting easily measurable user volumes. The TDP design problem is formulated and solved as a Stackelberg game. Tested on the empirical data of a 5000-user network, the TDP design leads to significant improvements in peak-hour usage and fairness, peak shaving and load balancing over pure QPC. The methodology requires only two simple and short-period data collections from an operational network and takes about 1 min of CPU time for TDP calculation. Results demonstrate the effectiveness of our design methodology when applied to Internet-access environments with frequent changes.     

Cyclic hoist scheduling in large real-life electroplating lines

This paper addresses cyclic scheduling of a single hoist in large real-life electroplating lines, where a part visits some processing tanks more than once and multiple duplicate tanks are used at some production stages having long processing times. We present a formal analysis of the problem and propose an efficient branch-and-bound algorithm. The developed analytical properties allow us to considerably eliminate dominated or infeasible solutions in the branch-and-bound procedure. Computational results on benchmark and real-life instances show that the algorithm is very efficient in scheduling large electroplating lines.     

A 9.1–10.7 GHz 10-W, 40-dB Gain Four-Stage PHEMT MMIC Power Amplifier

This letter presents a compact X-band high gain and high power four-stage AlGaAs/InGaAs/GaAs pseudomorphic high electron mobility transistor (PHEMT) monolithic microwave integrated circuit (MMIC) high power amplifier (PA). This amplifier is designed to fully match a 50-Omega input and output impedance. Based on 0.35-mum gate-length power PHEMT technology, this PA MMIC is fabricated on a 3-mil thick wafer. While operating under 8 V and 2700-mA dc bias condition, the characteristics of 40-dB small-signal gain, a 10-W continuous-wave saturation output power, and 33% power added efficiency at 9.7GHz can be achieved     

Diurnal Variation of the AMSU-A Brightness Temperatures Over the Amazon Rainforest

Brightness temperatures over the Amazon rainforest are obtained from the Advanced Microwave Sounding Units (AMSU-A and AMSU-B) instruments onboard three NOAA satellites (NOAA-15, -16, and -17, respectively) for the months of July, August, and October, 2002. The three AMSU-A instruments provided six daily measurements, separated by 2.5-5.5 h of the diurnal time intervals, over the Amazon rainforest region, and these measurements offer a unique opportunity for investigation of the diurnal variation of the brightness temperatures over the Amazon rainforests. The angular distributions of brightness temperatures over the Amazon rainforest are very stable and can be simulated with a radiative transfer model, which consists of an atmospheric radiative component and a rainforest-canopy model that treats the rainforest as a uniform layer with an effective canopy temperature. The simulated results agree well with the observations. The diurnal variation of brightness temperatures over the Amazon rainforest is simulated with a Fourier-series model. It shows that a second order of Fourier series can reproduce the observed pattern of diurnal variation of the brightness temperatures at zenith angles of 0deg, 28.7deg, and 58.1deg, respectively. In a practical application, the coefficients of Fourier-series expansion can be used to generate the brightness temperatures as a function of diurnal hours. These results can be applied to postlaunch calibration of satellite-borne microwave radiometer with different equator crossing time. In addition, the results presented in this paper indicate that the Amazon rainforest can be used as a hot calibration reference target. The availability of a land calibration target is important for calibration and validation of spaceborne microwave radiometers     

Wavelength-Tunable Microring Resonator on Lithium Niobate

A wavelength-tunable microring resonator with integrated microheater on lithium niobate is presented. Ridge structure on lithium niobate is formed by a wet-etching technique for enhancing the lateral index contrast of the waveguide. The resonant wavelength of the microring resonator is tuned through thermooptic effect by injecting current into the integrated microheater. The tuning characteristics of through port and drop port are measured and the tuning rates in the microring resonator with a radius of 100 mum for transverse-magnetic and transverse-electric polarizations are 2.54 x 10^-2 nm/mA and 3.40 x 10^-3 nm/mA.