利用洛河水沙资源改善沙苑地区生态环境的探讨

在分析沙苑地区农田现状和洛河水沙资源特性基础上,提出利用引洪淤灌技术引取洛河高含沙水淤灌,从而改良沙苑的土质和提高土壤肥力,并从工程技术和改良效果等方面全面分析了改良沙苑地区土质和生态环境,从而达到充分利用水沙资源综合治理和改善生态环境的目的。     

一种基于分步线性最优估计的全球中低纬区域电离层foF2重构方法

电离层F₂层临界频率f_oF₂是短波通信、探测和电子对抗等领域最为重要的应用参数之一. 针对全球范围内电离层测高仪分布较为稀疏的特点,基于全球电离层无线电观测站（Global Ionospheric Radio Observatory,GIRO）的测高仪实测数据,采用分步线性最优估计方法对电离层CCIR/URSI系数进行调整,实现了全球中低纬区域电离层f_oF₂的重构. 对2010—2016年的电离层f_oF₂重构结果进行分析,结果表明:在纬度变化上,中纬区域重构误差要低于低纬区域;在年变化上,重构的绝对误差和均方根误差有随太阳活动强度增强而增大的趋势,重构的相对误差无明显年变化;在季节变化上,夏季重构误差最小,其他三个季节相差不大;在地方时变化上,白天的重构误差低于夜间. 总体而言,相比于国际参考电离层(international reference ionosphere,IRI)模型,电离层f_oF₂重构的绝对误差和均方根误差分别下降了约38%和34%,验证了本文方法的有效性和可靠性.     

10Gbit/s甚短距离传输系统接收模块研究

本文研究了符合OIF—VSR4—01．0规范的甚短距离（VSR）并行光传输系统转换器集成电路，实现了接收部分转换器集成电路中帧同步、8B／10B解码、12路通道去斜移、检错纠错等模块的设计。在Altera的Stratix GX系列的FPGA上实现了接收部分转换器集成电路。仿真分析的结果表明所设计的各个模块能正确的实现接收部分转换器集成电路的功能，给出了仿真结果。     

甚短距离光互连模块技术的发展动态

甚短距离光互连技术作为一种突破铜线互连传输瓶颈有效方法,受到了广泛关注。半导体光学器件技术、高速化集成电路技术和光电模块封装技术作为实现光互连的关键技术发展较为迅速。首先阐述了垂直腔面发射激光器的电路模型,然后针对光信号发送模块介绍了预加重补偿技术以及开环方式稳定光功率输出技术,并对如何提高光信号接收模块带宽性能的电路技术进行了分析。其次结合光互连模块技术标准的发展,以NEC公司的实用化甚短距离并行光互连模块为例,对其光电封装技术进行了说明,最后就甚短距离光互连技术所面临的课题及发展前景进行了总结。     

An improved and provable self‐certified digital signature scheme with message recovery

This paper presents a self‐certified digital signature scheme with message recovery that is proven to be secure. So far, many schemes of this kind have been proposed to keep message secret in the transmission. But Zhang et al. has proposed the man‐in‐middle attack to Shao's self‐certified signature scheme, which is based on discrete logarithm. The attacker can make a new signature by using an old one, but the reason of such man‐in‐middle attack was not referred. We present the scheme of Yoon et al., which is also based on discrete logarithm, that cannot resist man‐in‐middle attack either, give the analysis of the attack, and propose a new scheme. The proposed scheme can resist forgery attack in the random oracle model and avoid message leakage, the man‐in‐middle attack, and meanwhile has several security characters. Compared with some self‐certified schemes, our scheme is the best because of the time cost. Copyright © 2013 John Wiley & Sons, Ltd.     

中型立筒仓共用管道熏蒸杀虫通风降温试验

立筒仓粮堆在储藏期间感染害虫和不正常升温,是安全储粮的难题,本试验在立筒仓内安装了一套共用管道系统,兼有熏蒸杀虫,通风降温和熏蒸残余气体利用的功能。使用该系统进行环流熏蒸,仓内各部位熏蒸气体分布均匀,杀虫效果达到100％,还配备了带有加热装置的气化器,在大气温度低于15.6℃和用药量超过51b的情况下,可使液态熏蒸剂充分气化,而达到理想的杀虫效果。该系统通风降温效果好,通风后每米粮层温差<1℃。将两个立筒仓的共用管道串接,可将熏蒸仓内约40％的熏蒸气体输送至邻仓,解决了残留药剂的利用问题。该试验安装的共用管道系统具有设计合理、设备简单的特点。     

改变中煤处理系统产品结构的探讨

介绍了改变中煤产品结构的工艺方案 ,以及此工艺方案所带来的经济效益。     

一套针对高泥质疏松砂岩薄储层的识别技术——以珠江口盆地X油田为例

针对珠江口盆地X油田韩江组高泥质疏松砂岩段扩径严重引起测井曲线质量差、波阻抗属性叠置严重、储层薄且非均质性强等难题,形成的薄储层精细表征技术概括为"三步法"：①遗传化神经网络技术重构能得到反映真实地层特征的弹性曲线,进而解决在疏松砂岩井段因扩径严重导致测井曲线失真的问题;②针对高泥质疏松砂岩薄储层识别难的问题,新构建DVT敏感特征参数来区分砂岩与泥岩;③利用波形指示高分辨率反演方法预测高泥质疏松薄砂岩储层的空间展布。实际应用表明：该技术在X油田注水收效、调整井优化实施和开发调整方案井网设计等方面取得了较好的应用效果,解决了该油田3~5 m薄层精确描述的难题,形成了一套完整的针对高泥质疏松砂岩薄储层预测的技术流程。该技术对同类油藏表征和油田高效开发具有参考意义。     

海上气田压力衰竭储层长水平段安全钻井控制技术

南海西部海域东方某气田Y平台采取浅层大位移水平井模式开发莺歌海组二段浅部气藏,储层埋深在井深1300m左右,最大水平位移为3783 m,最高水垂比为2.73。该气田经过十几年的开采,储层存在一定程度压力衰竭。同时,Y平台水平段穿过断层,钻进期间漏失风险高。在前期的一些开发井作业中,储层段钻进时曾多次发生井漏等复杂情况。因此,针对以往开发难题和结合Y平台的地层特点,进一步改良屏蔽暂堵无固相钻井液体系,配套环空ECD实时监测与精细控制工艺,成功解决了该区域储层漏失难题。Y平台实施的5口井提效显著,φ215.9 mm水平井段平均机械钻速为77.27 m/h,创造了东方区域类似浅部气藏大位移水平井的作业纪录。储层保护效果好,测试产量超油藏配产25%。      

THE OLIGOCENE–MIOCENE MENILITE FORMATION IN THE UKRAINIAN CARPATHIANS: A WORLD‐CLASS SOURCE ROCK

This study investigates the hydrocarbon potential of Oligocene–Miocene shales in the Menilite Formation, the main source rock in the Ukrainian Carpathians. The study is based on the analysis of 233 samples collected from outcrops along the Chechva River in western Ukraine in order to analyse bulk parameters (TOC, Rock‐Eval), biomarkers and maceral composition. In Ukraine, the Menilite Formation is conventionally divided into Lower (Lower Oligocene), Middle (Upper Oligocene) and Upper (Lower Miocene) Members. The Early Oligocene and Early Miocene ages of the lower and upper members are confirmed by new nannoplankton data. The Lower Menilite Member is approximately 330 m thick in the study area and contains numerous chert beds and turbidite sandstones in its lower part together with organic‐rich black shales. The shales have a high content of silica which was probably derived from siliceous micro‐organisms. The TOC content of the shales frequently exceeds 20 wt.% and averages 9.76 wt.%. HI values range between 600 and 300 mgHC/gTOC (max. 800 mgHC/gTOC). The Middle Member contains thin black shale intervals but was not studied in detail. The Upper Member is about 1300 m thick in the study area and is composed mainly of organic‐rich shales. Chert layers are present near the base of the Member, and a prominent tuff horizon in the upper part represents a volcanic phase during shale deposition. The member grades into overlying molasse sediments. The average TOC content of the Upper Menilite succession is 5.17 wt.% but exceeds 20 wt.% near its base. Low T_max and vitrinite reflectance measurements for the Lower (419°C and 0.24–0.34 %R_r, respectively) and Upper (425°C and 0.26–0.32 %R_r, respectively) Menilite Member successions indicate thermal immaturity. Biomarker and maceral data suggest a dominantly marine (Type II) organic matter input mixed with varying amounts of land‐plant derived material, and indicate varying redox and salinity conditions during deposition. Determination of the Source Potential Index (SPI) shows that the Menilite Formation in the study area has the potential to generate up to 74.5 tons of hydrocarbons per m². The Chechva River outcrops therefore appear to have a significantly higher generation potential than other source rocks in the Paratethys realm. These very high SPI values for the Menilite Formation may explain why a relatively small area in Ukraine hosts about 70% of the known hydrocarbon reserves in the northern and eastern Carpathian fold‐thrust belt.