A New Solution for Simple Cooperative Relaying

In this paper we present a new simple cooperative relaying scheme. The proposed scheme is compared with simple cooperative schemes with virtual orthogonal space time block coding (OSTBC) and quasi orthogonal space time block coding (QOSTBC). Every of these three schemes includes one base station with two antennas, two relay stations each with a single antenna and one mobile station with a single antenna. The aim of the proposed scheme is to preserve, as much as it is possible bit error rate (BER) performance of the cooperative scheme with virtual OSTBC, but with increased code rate. It is shown that the presented scheme obviously outperforms simple cooperative scheme with virtual QOSTBC, while in comparison with simple cooperative scheme with virtual OSTBC has very similar BER performance and increased code rate.     

Monoclonal antibodies ICO-02 to blast cell antigens in patients with chronic myeloleukemia in blast crisis

Mice were immunized with blood cells of a patient with chronic granulocytic leukemia, and their cells were subsequently used for the preparation of hybridoma ICO-02. This hybridoma is continuously producing monoclonal antibodies which reacted with cells in 4 out of 13 patients with blastic crisis of chronic granulocytic leukemia and in 6 out of 38 patients with acute lymphoblastic leukemia. Antibodies reacted with blast cells in 2 out of 3 patients with undifferentiated blastic crisis of chronic myelocytic leukemia and in 2 out of 5 patients with lymphoid variant of blastic crisis of chronic granulocytic leukemia. Cells of 6 patients with acute lymphoblastic leukemia which reacted with the monoclonal antibodies had immunological markers of T lymphocytes bone-marrow precursors. Monoclonal antibodies did not react with cells of blood and bone marrow from healthy people and from patients with chronic lymphocytic leukemia, acute myeloblastic leukemia, acute myelomonocytic leukemia, acute monoblastic leukemia and lymphosarcoma.     

1.55 mu m multiquantum-well lasers with record performance obtained by atmospheric pressure MOVPE using organometallic phosphorus precursor

The recently available precursor biphosphinoethane (BPE) was used, alongside with phosphine and with tertbutylphosphine (TBP), to grow advanced multiquantum-well (MQW) laser wafers with five quaternary, compressive strained wells. The lowest threshold current densities and the lowest optical losses were obtained with BPE. In particular, the lowest threshold current density, 328 A/cm/sup 2/, is a record among published values for lasers with five wells. In this comparison, the wafer grown with phosphine came a close second and that grown with TBP was third.<>     

磁悬浮实验分析

本文通过磁悬浮实验装置,分析了磁悬浮力的两种理论算法,比较了这两种算法的误差并与实验结果做了对比,用软件仿真计算了单匝线圈等效模型的磁悬浮力的频变特性并与理论值对比。本文在此基础上提出了多匝线圈的等效建模方法。验证表明这种方法与实验结果更接近,能比较精确地计算出盘状线圈的受力情况。     

Study on the Thermoelectric Properties of CVD SiC Deposited with Inert Gases

We deposited silicon carbide (SiC) by the chemical vapor deposition (CVD) method using the inert gases Ar and He. It was confirmed that SiC deposited with inert gases had a porous microstructure and high carbon content. We also studied the thermoelectric properties. SiC deposited with He gas had lower electrical and thermal conductivity compared with SiC deposited with Ar gas. Both samples using Ar and He exhibited a negative Seebeck coefficient, indicating n-type semiconductor behavior. The calculated figure of merit (Z) of SiC deposited with inert gases was improved compared with SiC deposited with H₂ or N₂ gas. The value for SiC deposited with He was higher than that for SiC deposited with Ar. The thermoelectric properties of porous silicon carbide deposited with inert gases were also compared with those of silicon carbide deposited with hydrogen or nitrogen gas.     

阿霉素或吡柔比星联合化疗方案对老年患者心电图影响对比研究

目的：比较安全剂量（〈400mg／m^2）内阿霉素与吡柔比星对于心脏毒性大小。方法：90名以阿霉素为主联合化疗和59名以吡柔比星为主联合化疗的老年肿瘤患者每次采用阿霉素或吡柔比星40mg／m^2静点,每疗程3次,每疗程之间间隔3周,分别于用药后1天,1周,2周复查心电图。结果：应用吡柔比星化疗方案进行化疗,其引起心电图改变的可能性远远低于应用阿霉素联合化疗方案的老年患者。结论;吡柔比星心脏毒性低于阿霉素。     

Dynamic-stress-induced dielectric breakdown in ultrathinnitride/oxide stacked films deposited on rugged polysilicon

The dielectric breakdown characteristics of thin reoxidized Si₃N₄ films on both smooth and rugged poly-Si have been studied under dynamic stressing (unipolar and bipolar) with frequencies of up to 500 kHz. For capacitors with smooth poly-Si the time to breakdown (t_BD) increases with frequency under unipolar stressing with positive gain bias, whereas it slightly decreases with frequency under unipolar and bipolar stressing with negative gate bias. For capacitors with rugged poly-Si, t_BD increases with frequency in all cases     

大功率LED照明装置微热管散热方案分析

设计了一种新型的带有百叶窗的平板式大功率发光二极管(LED)照明装置。该装置采用高导热系数的铝基板作为多颗大功率LED的散热电路板,用0.4mm的铝片作为散热翅片,结合沟槽式微热管构成集发光与散热一体化的输入功率为21W的照明模组,该模组可根据照明亮度要求重构成不同功率的照明装置。对功率为144W的照明装置进行了理论分析与实验研究。根据理论计算,每个照明模组的发热量约为18W,每个照明模组的传热量约为47W;模拟结果表明,在环境温度为30℃,自然对流换热系数为10W/(m2·K)时,LED芯片最高结温Ta=75℃,而实验测得Ta=75.7℃。     

生长系统对高阻区熔硅单晶径向电阻率变化的影响

分别采用L4375-ZE区熔炉和CFG/1400P区熔炉,生长了N型、(1.5～4.5)×103Ω.cm和P型、(1.0～5.0)×104Ω.cm两种规格的高阻区熔硅单晶,单晶的直径为52～54 mm,晶向为<111>。经对单晶的电阻率及其径向分布进行检测对比后发现,在加热线圈几何结构(包括上下表面角度、内径尺寸及台阶设计)基本相同、单晶生长速率相同且上、下晶轴旋转具有相同配置的情况下,不同的单晶生长系统所生长的单晶,其电阻率径向均匀性有明显差异,用L4575-ZE区熔炉生长的单晶的电阻率径向分布更均匀。     

C波段低噪声放大器设计的要点

介绍了用微波工作室软件对C波段低噪声放大器的设计及调试.设计制作的C波段低噪声场效应管放大器,采用全微带匹配网络,利用NEC公司生产的场效应管N32584C,两级级联,用微波工作室软件进行设计、仿真和优化,实现在4.4～5.1GHz范围内增益30dB左右,噪声系数小于0.8dB.用Prote199SE画印制板,该放大器制作在聚四氟乙烯基板上.     

High-speed InP/InGaAs avalanche photodiodes with a compositionallygraded quaternary layer

InP/InGaAs avalanche photodiodes (APDs) with a compositionally graded quaternary layer at the heterointerface between the InGaAs absorption and InP multiplication regions were fabricated and tested. A comparison of samples with the graded layer and with conventional three quaternary layers showed that the frequency characteristics for samples with the graded layer did not deteriorate at a low bias voltage even below -100°C, unlike APDs with three InGaAsP layers. Thus, no hole trapping occurred at the InP/InGaAs heterointerface with the graded layer. A sample with the graded layer showed a cutoff frequency exceeding 9 GHz at a low multiplication factor of 2. The authors found InP/InGaAs APDs with the compositionally graded quaternary layer to be useful over a wide temperature range     

QPSO与K-Medoids相结合的带障碍空间聚类新算法

分析了现有的带障碍约束空间聚类算法,针对基于PSO优化的带障碍约束的K-Me足,提出了QPSO与K-Medoids算法结合的带障碍空间聚类新算法(QKSCO).在带障碍约束的空间条件下,该算法依据蚁群格网障碍距离作为聚类依据,引入了QPSO的快速全局收敛的特性,使之与K-Medoids算法的局部收敛特性相得益彰.实验结...     

液体介质三维光子晶体禁带可调性能研究

研究了宽频折射率可调液体介质在三维光子晶体上的应用。设计了完美结构的液体光子晶体,采用 平面波展开法和有限时域差分法研究了液体介质的介电常数对光子晶体带隙的影响规律;采用光固化快速成型技 术制造了完美结构光子晶体模型,通过灌注不同介电常数的液体介质,发现液体光子晶体的电磁带隙频率随液体媒 介介电常数的升高而向低频移动,其禁带相比于传统液晶可调光子晶体有所拓宽。     

A reliability study of the lead-free solder connections of miniature chip components on hybrid circuits

The results of the influence of lead-free solder paste, design and process parameters on the attachment reliability of chip surface-mounted components (SMCs) on thick-film conductor pads are presented. The purpose of the investigation was to compare the quality of the soldered joints made with new solder pastes that do not contain lead with joints soldered with standard SnPb solders. The miniature zero-ohm chip resistors were soldered with selected lead-free solder pastes. The visual appearance of the solder joint according to the standards of lead-free soldered components was compared with components soldered with SnPb solders. On the test sample with soldered chip resistors connected in series, the solder-joint resistance was measured before and after temperature cycling. On the same test sample the solder-joint resistance changes were measured with impedance spectroscopy. After temperature cycling the damaged samples were analysed with SEM and EDS. The reliability test results after temperature cycling indicate two lead-free solder pastes that are the most convenient for chip-component soldering on thick-film conductor pads with the reliability of the joints being equal or better than solder joints with Pb-containing solder paste.     

聪脑益智针法联合精神运动康复 改善脑瘫认知障碍临床研究

摘 要:目的 观察聪脑益智针法联合精神运动康复改善脑瘫患儿认知功能障碍的临床疗效。方法 选取我院住院脑瘫患儿伴有认知功能障碍者100例为研究对象，以随机数字表法分为综合康复组、聪脑益智针法联合精神运动康复训练组各50例。两组患儿均以综合康复治疗为基础，治疗组在综合康复治疗基础上进行聪脑益智针刺联合精神运动康复训练治疗，两组患儿均治疗3个月，治疗前后均按参照有关文献拟定的疗效标准进行评定观察。结果 应用聪脑益智针法联合精神运动康复训练治疗脑瘫患儿认知功能障碍在提高智力方面亦优于常规综合治疗组，差异有统计学意义（P＜0.05）。结论 聪脑益智针法联合精神运动康复可有效改善脑瘫患儿认知障碍，临床疗效明显，值得在临床上推广应用。     

Analysis and design-optimization of LCC resonant inverter forhigh-frequency AC distributed power system

The analysis and design of an LCC resonant inverter for a 20 kHz AC distributed power system are presented. Several resonant converter topologies are assessed to determine their suitability for high efficiency power conversion, under resistive and reactive loads. Two LCC-resonant inverter designs were implemented. One with all switches operating with zero voltage switching (ZVS), and another with two switches operating with ZVS and two switches with zero current switching (ZCS). The experimental results are presented along with a performance comparison of the two versions     

激光混沌耦合同步及其在保密通信中的应用

建立了外部光注入半导体激光器激光混沌耦合同步系统，导出了耦合条件下的激光扰动方程和激光同步扰动方程。成功模拟了外部光注入波长1．3lμm分布反馈半导体激光器的激光混沌耦合同步，其同步误差小且抗噪声干扰能力强。该同步系统在混沌模拟和数字保密通信中的数值模拟表明，无论是在时域还是在频域，信息都难以被分离，该系统确有较高的保密性能和反破译能力。     

1．3μmDH-SLD的性能与工作电流和温度的关系

全面地测试并分析了掩埋双异质结型超辐射激光二极管模块的输出光功率、光谱和消光比与注入电流及温度的变化关系。得到：DH—SLD显示了软阈值特性,其输出光功率随注入电流的增大而增加,随管芯温度的升高而降低。温度不变时,当注入电流小于110mA(约)时,峰值波长随注入电流的增大而减小,当注入电流大于110mA(约)时,峰值波长随注入电流的增大有所增大;峰值波长随温度升高而增大。3dB带宽随注入电流的增大而减小,随温度的升高而略有增大。消光比随注入电流和温度的升高而变化。     

ICO-10 monoclonal antibodies to the Thy-1 antigen

Mouse monoclonal antibodies (MAB) ICO-10 to Thy-1 antigen were obtained. MAB ICO-10 reacted in indirect immunofluorescence test with 5.7 +/- 0.8% human thymocytes. Antibodies did not react with granulocytes, monocytes, T- and non-T cells from peripheral blood, and with marrow cells of healthy donors. MAB ICO-10 reacted with blast cells from 25 of 53 patients with T-cell acute lymphoblastic leukemia (ALL), from 2 of 5 patients with B-cell ALL. This antigen was absent on blood and marrow cells from some patients with ALL, 80 patients with chronic lymphoid leukemia, 54 patients with chronic granulocytic leukemia at the stage of blastic crisis, 128 patients with acute nonlymphoblastic leukemia. Antibodies are specifically bound to thymocytes and spleen cells of Thy 1.1 and Thy 1.2 mice. MAB ICO-10 detect Thy-1 antigen expressed on human hematopoietic cells. MAB ICO-10 may be applied for human leukemia and lymphoma immune diagnosis.     

Cyclic adenosine monophosphate content in the lymphocytes of cancer patients

Examinations have been carried out on 83 cancer patients (aged 34-72), 24 patients with atherosclerosis (aged 38-68) and 34 healthy persons (aged 20-69). The cAMP concentration decrease with age in lymphocytes of healthy persons is confirmed. This index in patients with lung carcinoma, breast carcinoma in remission and in patients with atherosclerosis was identical with that of healthy persons, but in patients with breast and corpus uteri carcinomas without metastases it was higher than in healthy persons of the similar age. The amount of cAMP in lymphocytes is compared with the magnitude of the blast transformation and with the amount of cholesterol in blood and lymphocytes in examined persons. The cAMP level in lymphocytes is observed to increase in the process of hyperlipidemia disappearance in cancer patients and in those with atherosclerosis.