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.     

Regulatory reform in the broadcasting industries of Brazil and Argentina in the 1990s

Regulatory reform has changed the organization of the broadcasting industry in Brazil and Argentina in the past decade. Although responding to a similar set of pressure, the pace, instruments, and character of reforms have been different in the 2 countries, resulting in media markets of diverse natures. This study argues that these different policy outcomes in the reform of broadcasting regulation in Brazil and Argentina reflect variations in three factors: the nature of the political system, the structure of the existing broadcasting industry, and the ideological legacy in the regulation of communication industries. The case of regulatory reform in the broadcasting industry illustrates different policy patterns in the restructuring of state-industry relations in communications and information technology industries in the 2 neighboring countries.     

In situ off-axis electron holography of metal-oxide hetero-interfaces in oxygen atmosphere

Off-axis electron holography has been extended to in situ observations in gas atmospheres. The Yttria-stabilized zirconia (YSZ)-Pt hetero-interface was characterized by electron holography at high temperature in a vacuum and in an oxygen atmosphere. Analysis of the phase shift profiles revealed high mobility of anions in the oxide in the vicinity of the interface in the oxygen atmosphere. This would compensate for any increase in the number of oxygen vacancies in YSZ through the metal interface.     

基于2007-2013年COSMIC掩星数据的电离层振幅闪烁研究

利用2007-2013年的COSMIC掩星数据，分析了E区与F区电离层闪烁的变化特征.发现用闪烁出现频次、闪烁发生率以及闪烁强度来表征的电离层闪烁出现规律比较相似.E区电离层闪烁在夏季半球的中纬地区最强，其次是春秋季的低纬地区和冬季半球.就经度分布来说，春秋季E区电离层闪烁呈四波结构.对F区电离层闪烁来说:南美-大西洋扇区在12月至点最为显著；非洲和太平洋扇区在6月至点最为显著；大西洋扇区在春秋分季最为显著.极区也出现中等强度的闪烁，尤其在南半球的90°E~180°E扇区较为显著.高纬E区电离层闪烁强度随太阳活动的增强而增强，而低纬和南半球的中纬E区闪烁随太阳活动的增强而减弱.高纬和低纬F区闪烁随太阳活动的增强而增强，而中纬F区电离层闪烁对太阳活动无显著依赖关系.对于赤道区来说，北半球60°W~60°E经度区闪烁强度随太阳活动的变化最为显著，其次是南半球60°E~210°E附近；而对于高纬地区来说，F区闪烁强度随太阳活动的变化最为显著的区域在南半球60°E~210°E附近.     

A Strategy for Broad-Band Network Introduction in Italy

Studies are being carried out in Italy concerning the strategy for the introduction in the 1990's of optical fiber systems in the distribution network, in order to supply customers with broad-band services (in particular with video services). This paper deals with some of the main choices that are being done, in particular in view of a field trial which is planned in Rome in 1988.     

ANSYS在高功率横流CO2激光器流道温度场分析中的应用

本文采用有限元方法建立了高功率横流CO2激光器流道温度场数学模型,利用ANSYS再现了激光器稳定工作状态下流道温度场分布,提供了测定流道内部温度的新途径。     

Fourth quarter 2009 IEEE communications surveys and tutorials

Welcome to the fourth issue of 2009 of the IEEE Communications Surveys and Tutorials. Paper in this issue survey the research effort in several areas such mobility in Wimax, mobility models in VANET, handoff in cellular networks, admission control in MANETS, physical impairments in optical networks, physical layer issues in the 802.11n standard as well as jamming in wireless sensor networks     

Inventive payoff from R&D in Japanese industry: convergencewith the West

An attempt is made to determine if investment in R&D and the hiring of college-educated employees result in a higher rate of inventions. The relationship between the input of R&D and inventive output is studied in two samples of Japanese factories, 34 in 1982 and 44 in 1970. These results are compared with findings in a parallel American study. The correlations between R&D and inventive output are similar in Japan and America in the 1980s, despite some differences in the management of innovation in the two nations. Moreover, the most Westernized subsample of Japanese firms in the 1970s had correlations between R&D and invention similar to those observed in the American study. Thus, it is concluded that some degree of convergence may be taking place in R&D management strategies in the two nations     

Effect of photovoltage on current flow in metal-semiconductor schottky-barrier contacts

It is shown that changes in device characteristics and an increase in the light-to-electrical energy conversion efficiency in metal-semiconductor Schottky barrier contacts are associated with a peripheral electric field built into the contact. For contacts with longer perimeters, variations in device characteristics and the light-to-electrical energy conversion efficiency are significantly larger. Since the photovoltage and peripheral electric fields in the contact region are codirected with the intrinsic electric field of the space-charge region, contact illumination results in a larger increase in the “dead” zone in forward portions of current-voltage characteristics, a larger decrease in the effective Schottky barrier height, and an increase in the field electron emission. An increase in the reverse field emission under photovoltage leads to an increase in the recombination current in the space-charge region, which provides dc photocurrent flow in the circuit.     

Principles of flicker noise spectroscopy and its application to disordered semiconductors: IonImplanted silicon

Flicker noise spectroscopy in disordered semiconductors is gaining wide acceptance both in physical investigation and in analysis of various microelectronics processes. Its successful use as a diagnostic tool in microtechnology is a result of advances in fundamental studies of flicker noise in semiconductors with disordered structure. In this work, we systematize experimental data for flicker noise phenomena in disordered semiconductors, specifically, in ion-implanted silicon     

Biomedical Engineering Education: Enrollment, Courses, Degrees, and Employment

During the 1979-1980 academic year a two-page questionnaire on biomedical engineering education was sent to 251 engineering schools. 71 schools indicated that they had degree programs and an additional 35 indicated that they had official minor or option programs, 107 did not have a program, and 38 did not respond. For schools offering degrees in biomedical engineering, there were 2859 students enrolled in 37 B.S. programs, 830 students in 48 M.S. programs, and 469 students in 41 Ph.D. programs. Options or minors in biomedical engineering with a degree in another engineering discipline were available at the B.S. level at 41 schools, at the M.S. level at 42 schools, and at the Ph.D. level at 34 schools. Over the past two years, schools offered 109 courses in biomedical instrumentation, 74 in computers in medicine, 162 in physiological systems/modeling, 60 in biomechanics, 47 in biomaterials, 33 in hospital internship, 23 in clinical engineering, 9 in biomedical engineering lab, and 67 in other areas. During the academic year 1978-1979, schools awarded 464 B.S. degrees, 249 M.S. degrees, and 107 Ph.D. degrees in biomedical engineering. Of these graduates, 253 found jobs in industry, 23 in government, 35 in academia, and 66 in hospitals or clinics; 100 went to medical school, 96 to biomedical engineering graduate schools, and 57 to other graduate or professional schools.     

东亚地区夏季Es的分布特性

东亚地区是全球Es出现的峰值区域.以往关于东亚异常的研究和讨论具有一定的局限性, 或者由于缺乏中国区域的资料而论据不足, 或者缺乏中国、日本Es中心的详细对比.文中利用中国及周边地区23个垂测站二十余年的Es数据进行空间插值分析, 给出东亚地区夏季Es出现率的空间分布等值线, 并深入分析东亚异常中心区域的时间变化特征.研究表明, 中国重庆、广州或者日本山川、国分寺、秋田是夏季Es的高发区域, 东亚异常中心始终位于其中某个地区, 具体位置随着统计指标改变; 高发区域内的Es强度呈现出年变化和日变化, 中国高发区域Es强度的昼夜差别比日本高发区域更为显著, 但后者具有更为复杂的年变化和昼夜变化特征, 这对揭示中纬Es形成原因具有一定的意义.     

中国WLAN市场发展报告

首先概述了国外WLAN的总体市场状况．接着详细描述了中国WLAN的发展现状，最后对WLAN在中国的发展前景进行了分析。中国WLAN发展所呈现的趋势包括：企业用户将大幅度增长，个体用户平稳增加；随着无线终端的普及，无线接入设备技术将走向成熟等。2002年中国WLAN设备市场的特点主要有：价格随时间逐步降低；市场区域相对集中；企业市场尚未完全打开等。综观国内市场，运营商已经把WLAN“架”起来了，但是WLAN要真正成为主流应用，关键在于它是否为运营商赢利．是否真正地征服用户。     

Analysis of the variation in the composition as a function of growth parameters in the MBE growth of indium doped Hg1−xCdxTe

Compositional changes induced in growing Hg_1−xCd_xTe layers as a function of the changes in temperature of the indium source in the MBE chamber have been analyzed in terms of the Hg-In alloy thermodynamics and changes in the activity of indium over the growing films as the Hg flux changes. Compositional changes induced by changes in the Te source temperature have been analyzed in terms of the changes in the activity of Cd over the growing layers. These analysis are helpful in understanding the compositional changes with variation of the growth parameters in the MBE chamber.     

WCDMA第一步小区搜索算法研究

本文对 WCDMA三步小区搜索第一步小区搜索实现算法进行了研究 ,充分考虑了频差对初始小区搜索的影响 ,提出了一种主同步信道匹配滤波器的实现方式。文中给出的算法减少了实现的复杂度 ,适用性好 ,对于不同情形下的小区搜索并不需要对算法本身进行修改。     

Some practical aspects of digital transmission

There are three worlds of digital transmission?digital transmission as an area of academic research, in which theoretical limitations and complicated schemes of modulation and encoding play the starring role; digital transmission in exotic space and military applications, in which it is, or may seem to be, worthwhile to search through the noise in a huge bandwidth in order to receive a few bits per second; and the digital transmission of everyday bulk communication. This article is concerned with that third area, in which apparatus must be economical and reliable; in which the FCC limits the bandwidth we may use in radio transmission; in which the increase in attenuation with frequency limits the bandwidth it is practical to use in cable transmission; in which error rates should be low enough that error correction is an expedient that need be resorted to only in special situations.     

LIBS水下原位探测技术研究进展

作为一种分析技术,激光诱导击穿光谱(Laser induced breakdown spectroscopy, LIBS)近年来在各个领域有着快速的发展, 在水下的应用也逐渐受到关注。对LIBS水下研究从实验室模拟到现场试验、从机理研究到技术发展都进行了回顾,并以 中国海洋大学研制的深海LIBS原位探测系统LIBSea为例,给出了LIBS系统在海洋探测中获得的典型结果,最后对未 来5~10年LIBS水下研究方向进行了展望。     

模拟电子技术考试命题改革实践

遵照“考理解、考应用、考发挥”的考试宗旨,笔者对模拟电子技术考试的命题作了相应改革。在考试的评分标准等方面也进行了改革尝试,实行了奖励分制度,对院模拟电子技术的教学改革起到了一定促进作用。     

拉美国家成为电信投资热点

拉美国家从８０年代末开始进行电信私营化及放开电信市场改革，尽管大部分国家的改革成效还有等观察，但投资商还是迫不及待的选择拉美国家电信市场作为投资的热点，而墨西哥和巴西更成了热点中的热点。本文介绍了拉美电信市场投资概况，重点分析了墨西哥和巴西两个国家电信投资的情况和特点，指出了中国电信应密切关注其发展概况，以便在适当时积极参与。     

The onset of double limiting cycle in the impurity-assisted electric breakdown of a compensated semiconductor with a shorted Hall voltage

Nonlinear autooscillations arising in the case of the impurity-assisted breakdown in a compensated semiconductor placed in a classically strong magnetic field with a shorted Hall voltage have been studied by means of computer simulation. A double limiting cycle appears in the phase portrait of the system in a certain range of load resistances (connected in series with the sample) and external DC voltages. This effect makes it possible, in principle, to construct a high-frequency generator operating in different amplitude modes under the same external conditions.