鄂尔多斯盆地北东部区域大规模叠合氧化形成条件与铀成矿作用

自2000年在鄂尔多斯盆地北东部发现首个层间氧化带砂岩型铀矿床以来,该区的铀矿找矿工作取得了快速发展,控制的区域层间氧化带规模不断扩大,氧化带前锋线不断增长,从东往西依次发现了皂火壕、纳岭沟和大营等特大型铀矿床,以及一大批铀矿产地。这些铀矿床与矿产地构成了杭东—皂火壕巨型层间氧化带砂岩型铀成矿带。通过对区域层间氧化带的形成条件分析,认为其主要控制因素为稳定的斜坡构造背景、丰富的铀源供给、巨型泛连通砂带、持续的含氧水补给、区域隔水层的发育和巨型还原障等。同时,结合构造演化与矿石年龄分析,在鄂尔多斯盆地北东部共划分出NW-SE、N-S、NE-SW和E-W向共4期叠合氧化成矿作用,并建立了三维铀成矿模式。     

潮水盆地西部半槽河地区砂岩型铀矿成矿潜力分析

通过对潮水盆地西部半槽河地区区域地质特征及铀成矿条件分析,认为相对稳定、适度抬升的盆地构造背景有利于后生含氧、含铀水的渗入改造及铀的迁移和再富集作用;盆地北部蚀源区变质岩中含有品质铀矿,长期隆升的古老蚀源区为盆地成矿提供了丰富的铀源;目的层中侏罗统青土井组为温湿气候下的扇三角洲沉积环境,扇三角洲平原河流相主砂体是铀富集成矿的有利赋矿空间;区内经历了多次后生氧化改造作用,氧化带规模较大,氧化带前锋线附近是铀矿体聚集、赋存的有利部位;矿化一般产在潜水氧化带底部和层间氧化带上、下翼。半槽河地区具备良好的砂岩型铀成矿潜力。     

伊犁盆地层间氧化带砂岩型铀矿成矿模式

在各种沉积环境标志综合分析的基础上,建立了伊犁盆地含矿主岩属冲积扇快速入湖的湿地扇沉积相模式;确立了铀成矿的有利相位;深入研究了层间氧化带特征、卷状矿体的分带特点及铀矿化空间展布规律;应用U-Pb同位素方法,获得了19Ma,12Ma,1.0Ma几个成矿年龄数据;详细地论述了砂岩型铀矿形成的诸多控制因素;总结了该盆地层间氧化带砂岩型铀矿成矿机制及成矿模式。最后,对盆地远景区划分和今后工作提出具体建议,强调了盆地西南缘,尤其是512矿床与511矿床之间地段应为今后工作的重点探索区。     

潮水盆地砂岩型铀矿地质特征及找矿方向探讨

潮水盆地是我国北方发育砂岩型铀矿的中新生代盆地之一,地处华北板块阿拉善地块之上。总结了盆地目的层岩性-岩相、砂体、后生氧化及典型矿点特征,分析了控矿因素,并指出了盆地下一步找矿方向。认为下白垩统庙沟群和中侏罗统青土井组是潮水盆地主要产铀层位,也是找矿目的层位,发育扇三角洲、辫状河有利相带,砂体规模较大,具备形成砂岩型铀矿的岩性-岩相及砂体等有利条件,U与∑S、Corg及Fe3+/Fe2+等地球化学环境参数关系密切,后生改造作用对铀的叠加富集成矿非常有利,目的层形成之后发生了多期抬升掀斜改造作用,在潜水氧化带底部和层间氧化带前锋线附近形成砂岩型铀矿化。通过综合分析,指出下白垩统庙沟群杂色层的找矿方向为长期隆升的富铀花岗岩体周缘、红色建造中富含炭屑的灰色层扇三角洲相砂体及潜水氧化叠加部位,以寻找沉积成岩叠加潜水氧化带型铀矿为主;中侏罗统青土井组的找矿方向为宽缓的构造斜坡带、富铀花岗岩体、含煤的辫状河相灰色砂体及层间氧化后生改造部位,以寻找层间氧化带型铀矿为主。     

内蒙古阿尔塔拉盆地砂岩型铀矿成矿地质条件及找矿方向初探

主要从盆地构造环境及后期构造演化特征、有利含矿建造形成期及形成后古气候演化、找矿目的层沉积体系及砂体发育特征、氧化带类型及其含矿性、盆地水动力系统等方面较系统地阐述了阿尔塔拉盆地砂岩铀矿的成矿环境。指出该盆地总体上具有良好的成矿条件，具备形成中小型砂岩铀矿的潜力；分析了盆地铀成矿的不利因素；明确提出该盆地惟一找矿目的层位为巴彦花群赛汉组，找矿类型以层间氧化带型为主；在盆内圈定了一片一级成矿远景区，并对今后工作方向和重点提出了建议。     

伊犁盆地层间氧化带砂岩型铀矿成矿模式

在各种沉积环境标志综合分析的基础上,建立于伊犁盆地含矿主岩属冲积扇快速入湖的湿地扇沉积相模式;确立了铀成矿的有利相位;深入研究了层间氧化带特征、卷状矿体的分带特点及铀矿化空间展布规律;应用U-Pb同位素方法,获得了19Ma,12Ma,1.0Ma几个成矿年龄数据;详细地论述了砂岩型铀矿形成的诸多控制因素;总结了该盆地层间氧化带砂岩型铀矿成矿机制及成矿模式。最后,对盆地远景区划分和今后工作提出     

滇西梁河盆地砂岩型铀矿化特征及控矿因素

梁河盆地是滇西地区砂岩型铀矿赋矿盆地之一,现已探明砂岩型铀矿床2个。在野外调查的基础上,结合钻探查证,对梁河盆地砂岩型铀矿化特征及控矿因素进行研究,结果表明,梁河盆地内已探明砂岩型铀矿床定位于冲积扇扇中颗粒流-砾质辫状河沉积砂体中。铀矿化与潜水层间氧化带关系密切,铀矿体定位于潜水层间氧化带前锋与上、下翼。热水改造作用有利于基底岩石中铀的淋出,并沿断裂带上升进入沉积盖层中,在富含有机质、炭质的地段被吸附沉淀,叠加在潜水层间氧化带形成的铀矿体上,形成富铀矿体。铀矿化受蚀源区岩石、基底凹槽(冲积扇扇体)、地层层位、岩性岩相、潜水层间氧化带控制,热水改造作用控制了富铀矿体的展布。研究成果对在梁河盆地内开展砂岩型铀矿找矿工作具有一定的指导意义。     

鄂尔多斯盆地南部双龙地区铀成矿特征分析

利用新的勘查成果以及收集该地区的煤田勘查资料和前人的研究成果,详细分析鄂尔多斯盆地南部黄陵双龙地区的铀成矿特征。该区主要赋矿层位为中侏罗统直罗组下段下亚段(J2z1-1),为一套辨状河沉积,泥-砂-泥岩性结构稳定,砂体厚度适中,显示出良好的层间氧化带砂岩型铀矿成矿条件;区内发育渗入氧化蚀变和渗出还原蚀变,其中绿色蚀变是油气渗出二次还原氧化砂体而形成,是古氧化带的标志;利用沥青铀矿物U-Pb同位素年龄测定方法,测得双龙地区铀成矿时代可分为两期:早白垩世沉积成岩期,成矿年龄为125.2~98 Ma和始新世主成矿期,成矿年龄为52.6±2.2 Ma~41.8±9.3 Ma,与店头矿床属同期成矿。铀矿化赋存于斜坡带上隆起与洼陷的过渡部位,主要发育在古层间氧化带前锋线附近。研究发现,双龙地区显示良好的古层间氧化带砂岩型铀矿成矿潜力,具有广阔的勘查前景。     

鄂尔多斯盆地南部X探区砂岩型铀成矿地质条件及成矿机理分析

为加强“油-铀”兼探,了解油气矿权区内砂岩型铀矿的资源潜力,在鄂尔多斯盆地内开展了以砂岩型铀矿为勘查对象的老井复查工作,在盆地东南缘X探区发现一批放射性高异常钻井。研究认为,该区具有一定的铀资源潜力。以该区西北部L地区和中部T地区放射性异常特征为基础,对其成矿地质条件进行了细致的分析。研究表明,该区位于构造斜坡带,地层平缓,铀源丰富,古气候适宜,砂体稳定发育,具有完整的补-径-排系统和良好的铀成矿地质条件。通过铀成矿机理研究,研究区内砂岩型铀成矿过程可分为沉积预富集阶段、古层间氧化作用成矿阶段和氧化-还原作用成矿保矿阶段。     

鄂尔多斯盆地南缘砂岩型铀矿地质特征及成矿条件分析

鄂尔多斯盆地南缘,中侏罗统中粗粒砂岩中古层间氧化带发育,铀含量高,砂岩型铀成矿地质条件有利,已发现多处砂岩型铀矿床（点）。铀矿化产于中侏罗统直罗组下段辫状河流相的砂体中,受古层间氧化带控制;铀矿化与砂岩渗透性关系密切,一般产于胶结疏松、透水性较好的砂体中;成矿区域内中侏罗统广泛发育,砂岩型铀矿找矿潜力大。     

The research about the time-effect of the wettability on the wool surface treated by the Ar plasma jet in the atmospheric pressure

A facility which is called atmospheric pressure and normal temperature plasma jet was introduced in this paper. After the wool surface was treated by this kind of facility with Ar in different irradiating times, the time-effect of the fabric wettability has been weakened, and if the parameters of the irradiating time and the voltage of the facility are appropriate, the time-effect of wettability can be effectively inhibited. With the stable wettability, the fabric can be dressed without PVA (polyvinyl alcohol) which can cause lager pollution in the textile field, so the method without the time-effect of the textile wettability will be useful in the field of clean textile production. Undoubtedly, the stable wettability of textile surface was caused by the stable hydrophilic molecules on the textile surface. Thus, the reaction process and results on the textile surface treated by plasma needs to be studied to optimize the parameters of the irradiating time and the voltage of the plasma jet. So the initial experimental studies on the optimization of the parameters of the plasma jet were discussed in this paper, and the authors believe that the method without the time-effect also can be used in other fields of plasma application.     

Effect of the Discharge Voltage on the Performance of the Hall Thruster

In this paper,a two-dimensional physical model is established according to the discharging process in the Hall thruster discharge channel using the particle-in-cell method.The influences of discharge voltage on the distributions of potential,ion radial flow,and discharge current are investigated in a fixed magnetic field configuration.It is found that,with the increase of discharge voltage,especially during 250-650 V,the ion radial flow and the collision frequency between ions and the wall are decreased,but the discharge current is increased.The electron temperature saturation is observed between 400-450 V and the maximal value decreases during this region.When the discharge voltage reaches 700 V,the potential distribution in the axis direction expands to the anode significantly,the ionization region becomes close to the anode,and the acceleration region grows longer.Besides,ion radial flow and the collision frequency between ions and the wall are also increased when the discharge voltage exceeds 650 V.     

Detecting the meteoroid by measuring the electromagnetic waves excited by the collision between the hypervelocity meteoroid and spacecraft

The electromagnetic pulse excited by the collision between a hypervelocity meteoroid and a spacecraft is studied both numerically and theoretically. It is found that there are two kinds of electromagnetic pulse. The high-frequency electromagnetic pulse may be excited by the sum of all the electric dipoles. Each electron can be considered as an electric dipole. The low-frequency electromagnetic pulse is produced by the Langmuir oscillation of electrons. The energy flux density and the duration time of the excited low-frequency electromagnetic pulse by the meteoroid are also studied in the present paper. It is shown that the energy flux density increases as either the impact speed or the mass of the meteoroid increases. It is also shown that the duration time decreases as both the impact speed and the mass of the meteoroid increase. By measuring the strength and the duration time of the electromagnetic pulse excited by the collision between the hypervelocity meteoroid and spacecraft, we can estimate the speed and the mass of the hypervelocity meteoroid, which will be helpful in space flight and space exploration.     

右侧卧位对左室下壁心肌衰减校正价值的初探

为探讨右侧卧位对左室下壁心肌衰减校正和心梗诊断的价值,对31名正常者和22名冠心病病人同时进行了仰卧位和右侧卧位的^99mTc-MIBI静息心肌显像,病人均作了冠状动脉血管造影。观察正常者在不同体位时下壁形态并通过靶心图计算各区象素计数。判定不同体位各供血区病变诊断的敏感性和特异性。结果表明,右侧卧位时下壁形态显示较好而且计数明显增高,P＜0．05,同时对右冠状动脉病变的敏感性和特异性分别为100％和81．8％,较仰卧位明显提高,结果提示,右侧卧位不仅可使下壁衰减得以校正而且可提高对心梗诊断的准确性。     

Current status of the engineering design of the test modules for the IFMIF

Under Broader Approach (BA) Agreement between EURATOM and Japan, IFMIF/EVEDA (International Fusion Materials Irradiation Facility/Engineering Validation and Engineering Design Activities) has been performed since the middle of 2007. IFMIF presents three main facilities (the Accelerator Facility, Li Target Facility and Test Facilities). A previous design of IFMIF was summarized in the comprehensive design report [1]. The present EVEDA phase aims at producing a detailed, complete and fully integrated engineering design of IFMIF. The delivery of the “Intermediate IFMIF Engineering Design Report” is foreseen mid-2013. The goal of IFMIF is to obtain the indispensable design database to allow the design and licensing of DEMO and ensuring commercial reactors thanks to the materials data set obtained from planned evaluation tests such irradiations in high flux test modules (HFTM-vertical rig, HFTM-horizontal rig), medium flux test modules (creep fatigue test module, tritium release test module, liquid breeder validation module) and low flux test modules of IFMIF. In addition, the Startup Monitoring Module will be used for IFMIF commissioning. This paper is summarizing the overall current progress status of the engineering and conceptual design of the test modules in IFMIF/EVEDA.     

周期计设计中的分段处理问题

本文通过对反应堆周期计响应时间、过冲量及噪声问题的分析,探论周期测量和周期保护信号分别处理的必要性和可能性,目的在于改善周期信号的品质,提高周期计的使用效果。本文首次报道了差分型周期计的响应函数。     

EAST强流离子源电源系统的初步测试运行

测试NBI大功率强流离子源的综合测试台正在建设,已研制了离子源等离子体发生器电源系统、等离子体电极高压电源及梯度极分压器、抑制极负高压电源等电源系统,以及高压传输线及缓冲器,在测试台上开展了对EAST中性束注入器第一台兆瓦级强流离子源样机进行整体电源系统测试和离子源起弧放电的初步测试,完成了离子源电源系统初步性能测试及...