mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
高产杂交水稻新组合万优481

籼型杂交水稻新组合万优481是重庆三峡农业科学院用异交习性好、配合力高的不育系万3A与优质恢复系万恢481配组育成,2012年4月通过重庆市农作物品种审定委员会审定(渝审稻2012006)。该组合具有杂种优势强、丰产性好、适应性广、稻瘟病抗性较强的特点,适宜在重庆市海拔800 m以下地区作一季中稻种植。
不育系博ⅢA的特征特性及高产繁殖技术

博ⅢA是广西博白农业科学研究所选育的三系不育系,开花习性好,异交结实率高。多年生产实践表明,博ⅢA最佳抽穗扬花期要求温度在28~32℃、湿度在80%~85%。总结了培育分蘖壮秧、本田插足基本苗等高产繁殖技术。
BT型粳稻不育系沪旱2A机插秧高产繁殖技术

沪旱2A是上海市农业生物基因中心选育的BT型粳稻优质节水抗旱不育系,具有开花习性好、可恢性好、米质优良、异交习性好等特点。介绍了沪旱2A的机插秧高产繁殖技术。
Heat Transfer in a Liquid-Solid Circulating Fluidized Bed Reactor with Low Surface Tension Media

Heat transfer characteristics between the immersed heater and the bed content were studied in the riser of a liquid-solid circulating fluidized bed, whose diameter and height were 0.102 m (ID) and 2.5 m, respectively. Effects of liquid velocity, particle size, surface tension of liquid phase and solid circulation rate on the overall heat transfer coefficient were examined. The heat transfer coefficient increased with increasing particle size or solid circulation rate due to the higher potential of particles to contact with the heater surface and promote turbulence near the heater surface. The value of heat transfer coefficient increased gradually with increase in the surface tension of liquid phase, due to the slight increase of solid holdup. The heat transfer coefficient increased with the liquid velocity even in the higher range, due to the solid circulation prevented the decrease in solid holdup, in contrast to that in the conventional liquid-solid fluidized beds. The values of heat transfer coefficient were well correlated in terms of dimensionless groups as well as operating variables.
Influence of diffuser on aerodynamic noise of a forward curved fan

In order to clarify the influence of a diffuser on the characteristics of a forward curved fan, the influence of the bare ratio and the outlet angle on the characteristics of the fan were measured through an experiment performed with an actual fan as well as through a numerical simulation, respectively. The mechanism of the discrete frequency noise generated by the separated flow of the diffuser was analyzed. The optimized bare ratio was approximately 17%. The flow separated inside of the diffuser generated discrete frequency noise owing to the interaction between the reversed flow from the diffuser and the impeller rotating at the blade passing frequency. The diffuser outlet angle influenced the pressure ratio more than that by the bare ratio. Furthermore, it was confirmed that restraining the separation in the diffuser effectively decreases the fan noise.
Distribution features, transport mechanism and destruction of cuttings bed in horizontal well

In an effort to develop methods of solving the issue of cuttings bed in horizontal wells, a 3-D transient model is established to simulate the distribution features and the transport mechanism of cuttings bed. The CFD calculation results show that the cuttings at the cross-sectional area of the mutation location such as the drilling pipe connector would easily settle down to build up a cuttings bed and the transport performance of the cuttings in a horizontal well can only be improved to some extent by adjusting the working parameters without using any destruction tools for the cuttings bed, thus the issue of a cuttings bed can not be solved in general. Accordingly, a new approach to effectively prevent and actively destroy the cuttings bed by using the Cuttings Bed Impeller (CBI) is proposed, the sensitivity analysis of which is conducted to determine the optimal structural parameters and the best matched working parameters from a perspective of the wellbore cleaning. Results show that the use of the CBI produces a number of benefits, including the reduced drill string torque to avoid the stuck pipe incidents with corresponding improvement in hole quality, a shorter trip time, and less wear on the drill string, the top drive and the casing. This research offers theoretical guidelines for the design of destruction tools for the cuttings bed and for the wellbore cleaning control in the horizontal drilling.
Progress in numerical simulation of cavitating water jets

This paper reviews recent progress made toward modeling of cavitation and numerical simulation of cavitating water jets. Properties of existing cavitation models are discussed and a compressible mixture flow method for the numerical simulation of highspeed water jets accompanied by intensive cavitation is introduced. Two-phase fluids media of cavitating flow are treated as a homogeneous bubbly mixture and the mean flow is computed by solving Reynolds-Averaged Navier-Stokes (RANS) equations for compressible fluid. The intensity of cavitation is evaluated by the gas volume fraction, which is governed by the compressibility of bubble-liquid mixture corresponding to the status of mean flow field. Numerical results of cavitating water jet issuing from an orifice nozzle are presented and its applicability to intensively cavitating jets is demonstrated. However, the effect of impact pressure caused by collapsing of bubbles is neglected, and effectively coupling of the present compressible mixture flow method with the dynamics of bubbles remains to be a challenge.
氢化物发生-原子吸收光谱法测定皮革制品中可萃取铅

铅能抑制人体内血红素的合成和溶血,损害大脑、小脑、脊髓和周围神经,造成可逆性近曲小管功能失调,还可导致血管痉挛等病变。铅可以通过乳汁影响后代,研究证实:铅对儿童的身高及体重有着显著的不良影响,可导致儿童,尤其是学龄前儿童体格生长的落后。
催化光度法测定饮用水中微量溴酸根

饮用水的化学物质污染日益受到人们的关注,以臭氧/活性炭、臭氧/生物活性炭、臭氧高级氧化为代表的水深度处理技术正被越来越多地采用。臭氧处理含有溴离子的水源水或滤后水时,能将溴离子氧化成为溴酸根。沿海地区的地表水、地下水中往往含有一定浓度的溴离子。1992年世界卫生组织对溴酸盐使用安全的审查报告中,确认溴酸盐是一种氧化性致癌物,主要导致动物的肾和膀胱组织发生癌变。国际癌症研究机构(IARC)把溴酸盐定为2B级的潜在致癌物,美国环保局(USEPA)规定饮用水中溴酸根的最高允许质量浓度为10μg·L~(-1)。2004年,世界卫生组织(WHO)将《饮水水质标准》中溴酸根限量值修订为10μg·L~(-1)。2005年,我国建设部颁布的行业标准CJ/T20622005《城市供水水质标准》中溴酸根限量值为0.01mg·L~(-1)(臭氧消毒时测定)。建立灵敏、方便、快捷、准确的饮用水中微量溴酸根的测定方法具有重要意义。
老年人住宅厨房无障碍设计原则与要点

因其空间狭窄功能繁多,住宅厨房在室内居住环境中是最容易发生事故的地点之一,如果空间布置不合理或设施装置不完备很容易给老年人带来危险。无障碍厨房的应用可以帮助老年人提高自理能力,减少对他人的依赖,预防意外的发生,可以营造一个切实保障老年人舒适、安全、方便的生活环境,也是社会物质文明和精神文明不断提高的体现。在进行老年人住宅厨房无障碍设计时,要多角度分析老人的生理、心理、经济状况、个人习惯等特点,综合考虑易用性、安全性、个性化、开放性和舒适性等原则,运用基于老人人机工程学尺寸设计的厨房家具选用、厨房设备的易用性设计、辅助器具的合理适配、灯光色彩和操作流线等设计要点,以弥补老年人所丧失的生理及心理功能,构建和谐、全面和系统的无障碍居家环境,提高他们的生活质量和社会参与。此外,Nadia Zouba 等[26—30]借助传感器、网络通讯、智能控制等系统实现对老年人的日常生活活动的分析、监控,能够预判老人居家生活及从事家务操作时的生理、心理状况,为创建无障碍的厨房环境、提高老人晚年生存质量提供了新的研究思路和技术支持。
Subepicardial endothelial cells invade the embryonic ventricle wall to form coronary arteries

Coronary arteries bring blood flow to the heart muscle. Understanding the developmental program of the coronary arteries provides insights into the treatment of coronary artery diseases. Multiple sources have been described as contributing to coronary arteries including the proepicardium, sinus venosus (SV), and endocardium. However, the developmental origins of coronary vessels are still under intense study. We have produced a new genetic tool for studying coronary development, an AplnCreER mouse line, which expresses an inducible Cre recombinase specifically in developing coronary vessels. Quantitative analysis of coronary development and timed induction of AplnCreER fate tracing showed that the progenies of subepicardial endothelial cells (ECs) both invade the compact myocardium to form coronary arteries and remain on the surface to produce veins. We found that these subepicardial ECs are the major sources of intramyocardial coronary vessels in the developing heart. In vitro explant assays indicate that the majority of these subepicardial ECs arise from endocardium of the SV and atrium, but not from ventricular endocardium. Clonal analysis of Apln-positive cells indicates that a single subepicardial EC contributes equally to both coronary arteries and veins. Collectively, these data suggested that subepicardial ECs are the major source of intramyocardial coronary arteries in the ventricle wall, and that coronary arteries and veins have a common origin in the developing heart.
Orientation Field Guided Texture Synthesis

We present a framework for example-based texture synthesis with feature directions aligned to vector fields with 2-way rotational symmetry, also known as orientation fields. Through a simple variational formulation, the framework allows the user to design the orientation field with intuitive controls, by interactively manipulating singularities and field directions. The resulting field is then used to guide a parallel synthesis. Our contribution is twofold: a design tool for orientation fields with a natural boundary condition, and a parallel texture synthesis adapted specifically for using such fields in feature alignment. We demonstrate the advantages of the procedure through examples on planar and curved patches with trivial topology.
Learning Structure Models with Context Information for Visual Tracking

Tracking objects that undergo abrupt appearance changes and heavy occlusions is a challenging problem which conventional tracking methods can barely handle. To address the problem, we propose an online structure learning algorithm that contains three layers: an object is represented by a mixture of online structure models (OSMs) which are learnt from block-based online random forest classifiers (BORFs). BORFs are able to handle occlusion problems since they model local appearances of the target. To further improve the tracking accuracy and reliability, the algorithm utilizes mixture relational models (MRMs) as multi-mode context information to integrate BORFs into OSMs. Furthermore, the mixture construction of OSMs can avoid over-fitting effectively and is more flxible to describe targets. Fusing BORFs with MRMs, OSMs capture the discriminative parts of the target, which guarantees the reliability and robustness of our tracker. In addition, OSMs incorporate with block occlusion reasoning to update our BORFs and MRMs, which can deal with appearance changes and drifting problems effectively. Experiments on challenging videos show that the proposed tracker performs better than several state-of-the-art algorithms.
建立信息系统提升管理水平

1公司概况中国水电顾问集团贵阳勘测设计研究院工程监理公司(以下简称贵阳院监理公司)随时代演变经历了由处室到公司的发展历程。贵阳院监理公司从20世纪80年代末在普定水电站总承包项目处参加部分前期准备工作的建设监理工作起开始从事工程建设监理工作。经过近十年的试运行,中国水电顾问集团贵阳勘测设计研究院本着“一业为主、两头延伸、多种经营”的方针,于20世纪90年代中期组建监理处。为了适应建设监理任务日益增多这一形式发展的需要,20世纪90年代末成立了监理公司。随着贵州省西电东送工程的全面开展,水电交通和市政建设监理市场的逐步扩大,为了加强监理专业管理,搞好监理项目控制,中国水电顾问集团贵阳勘测设计研究院于2005年1月将原监理公司更名为工程监理公司,成为模拟法人运作的内部二级独立核箅单位。
丰满水电站重建工程环评工作关键技术研究与创新

1工作背景始建于1937年的丰满水电站位于吉林省吉林市,坐落在美丽的松花江上,是我国最早建成运行的大型水电站,被誉为“中国水电之母”。由于曰伪时期的工程设计和施工存在诸多问题,丰满水电站存在无法根除的先天性缺陷,后经多次续建、改造、扩建,丰满水电站一直在不断的加固与维护补强中运行,但始终未能彻底根除。大坝的安全指标已不能满足国家的规范要求,对下游的生产生活安全产生了极大的威胁。2009年7月,经过前期深人设计及多方案的比选,在集国内著名院士、设计大师、专家论证意见后,确定采取重建方式对丰满水电站进行全面治理,在原坝址下游120 m新建一座大坝,同时对原大坝进行部分拆除的方案。
地理学关于城镇化领域的研究内容框架

改革开放以来,中国实现了长时期的高速和超高速经济增长,成为世界上第二大经济体。与此同时,实现了大规模的城镇化。到2012年,全国城镇化率超过了52%,2010年和改革开放初期1980年,即30 a前相比,全国能源消耗由每年5.7×10~8t 标准煤增加到32.5×108t标准煤,增加的城市人口相当于350个100万人口的特大城市的规模。巨大的经济总量和社会总量(特别是城市人口规模)再加上长时期低端产品“世界工厂”的发展模式,使中国的自然结构和社会经济结构发生了剧烈的变化,也使我们付出了极大的代价:自然资源大耗竭,环境大污染,国土开发和基础设施建设惊人浪费。这种影响较之全球气候变化对我们生存和发展的影响大得不可估量。给地理学提出了一系列重要的实际问题和理论问题。其中,城镇化是一个多学科研究的重大领域。地理学家应以强烈的意愿去研究。
Targetoid hemosiderotic hemangioma (hobnail hemangioma): typical clinical and histological presentation

To the editor: Targetoid hemosiderotic hemangioma (THH), also known as Hobnail Hemangioma (HH) is characterized by a violaceous to brown targetoid lesion. The classic histological presentation of THH is that of ectatic vascular lumina mainly in the superficial and mid-dermis lined by a single layer of endothelial cells with hobnail appearance. We report here a case of THH in China with distinctive clinical features.
老年人骨质疏松性髋部骨折术后应用膦酸钠疗效评价

骨质疏松是以骨量减少为特征的骨组织显微结构改变和骨折危险频度增加的疾病。随着老年人口的增加,原发性骨质疏松症患者逐年增多,由此而引发的骨折率也不断上升,严重危害老年人尤其是绝经后妇女的健康。60岁以上老年人骨质疏松发病率高达55%,骨折发生率约为10%,而其中最严重的是髋部骨折,12%~20%的患者会因为骨折或手术引起的并发症在1年内死亡,超过半数的幸存者不能行走或行动不便。随着老年社会的到来,绝经后老年妇女髋部骨折成为家庭、社会和医保的巨大负担。我们将阿仑膦酸钠应用于髋部骨折术后的骨质疏松患者,进行随机双盲平行对照研究,以研究与证实阿仑膦酸钠的临床疗效和安全性,以及在骨质疏松性髋部骨折术后应用的必要性。
痴呆家属照顾者自我效能研究进展

预计中国将成为老年痴呆患者绝对数量最多的国家,并且在中国,90%以上的痴呆患者将由其家属照顾。痴呆患者的认知和躯体损害、特别是患者病程中高达90%的行为和精神症状(BPSD)是损害家属照顾者身心健康的最重要因素。近十几年来,国内外研究发现照顾者自我效能对照顾者身心健康具有保护性作用。自我效能的概念来源于班杜拉的社会学习认知理论。自我效能强调个体对自身在特定情境下执行某一特定行为的能力的判断,这种判断决定了个体行为的动机和坚持性。相关干预研究发现提高照顾者自我效能、有助于增强个体对环境的调整和适应能力,改善照顾者的健康结果。现就痴呆家属照顾者自我效能与患者各项损害、照顾者的社会支持和健康相关结果间关系以及自我效能评价工具的研究进展进行综述。
沧州市郊大气PM_(10)浓度变化特征分析

可吸入颗粒物(PM_(10))危害人体健康,降低大气能见度,已成为我国城市发展进程中所面临的主要环境污染问题.沧州属于环京津、环渤海开放一线地区,全国第三座化工城,以石油化工、管道装备制造等产业为主要支撑,影响沧州市空气质量的主要污染物为PM_(10).研究沧州市PM_(10)浓度变化特征,对于指导本地经济的可持续发展,和京津大气环境质量的改善都具有重要意义.本研究基于2009年7月1日-2010年6月30日沧州市郊PM_(10)监测数据,分析了PM_(10)浓度变化特征和风向、风速对PM_(10)浓度的影响,以期为沧州市PM_(10)的预报和治理提供一定的参考依据.
常见几种老年期痴呆的神经递质变化及意义

明晰各种痴呆不同脑区域内各种神经递质的变化,对临床识别痴呆的各种症状、探讨功能影像学表现、并针对神经递质变化综合治疗痴呆患者,均有着积极的意义。现对近5年常见退行性变痴呆的各种神经递质改变的文献进行了总结,以期为各种痴呆的诊断和治疗提供帮助。
胃癌新辅助化疗临床研究的现状及设计要点

近年来,在局部进展期胃癌(local advanced gastric carcinoma,LAGC)治疗领域中,有以下两点得到东西方肿瘤学界一致公认:一是D2根治术成为LAGC标准术式;二是在美国癌症联合委员会(American Joint Committee on Cancer, AJCC)7.0版中,原6.0版中Ⅳ期M0患者不再列为Ⅳ期,而为可能根治人群。由此带来了深远影响,LAGC患者必须接受多学科治疗,即根治手术联合新辅助和(或)辅助治疗。同时,随着ACTS-GC和CLASSIC研究结果的相继公布,MAGIC等现有的新辅助化疗临床研究也逐步显示出其历史局限性。如何进行新辅助化疗成为肿瘤内外科医师的共同困惑和关注热点。为此,我们拟从临床研究设计的角度,分析胃癌新辅助化疗的现状及其瓶颈,探讨如何设计成功的新辅助化疗临床研究。
肥厚型心肌病基因突变检测的临床与社会意义

肥厚型心肌病(HCM)是最常见的遗传性心脏病,也是第一种明确致病基因的心脏病。该病由编码心肌肌小节蛋白及其相关蛋白基因突变引起,主要呈常染色体显性遗传,亦可呈常染色体隐性遗传,患病率约1∶500,是青年人心原性猝死(sudden cardiac death, SCD)的首要原因。自1990年Geisterfer-Lowrance等首次发现心肌β-肌球蛋白重链基因(MYH7)第13号外显子错义突变Arg403Glu,近20年来已在至少27个基因中发现1400余种HCM相关突变。基因检测技术不仅在帮助人们理解HCM的遗传基础上具有重要意义,在HCM的临床实践中亦发挥着重要作用。本文主要就HCM基因检测的临床与社会意义做一综述。
东江电子航道图制作关键技术研究

东江流域水网密布,下游海河直达,通航水道错综复杂。东江流域地理信息和航行保障的资料奇缺。本文结合内河电子航道图的实际情况,分析东江电子航道图编制过程中出现的有关技术问题,并提出解决办法。
集群和负载均衡技术在GIS数据中心的应用研究

以浙江省地理空间数据交换和共享平台为例,在分析地理信息在线服务平台特点和GIS服务质量需求的基础上,对服务器高可用性、负载均衡技术与构建方式进行讨论,给出省级GIS数据中心高可用性服务器集群和负载均衡服务器集群的设计模型,并描述相关的系统架构、设备部署、负载均衡策略、应用状态检测等方面的内容;最后分析GIS服务性能的模拟测试数据。
基于不同高度角的对流层延迟改正模型选择

主要介绍3种对流层延迟改正模型:霍普菲尔德(Hopfield)模型,萨斯塔莫伊宁(Saastamoinen))模型,布莱克(Black)模型。根据这3种模型利用IGS数据验证不同高度角的变化对延迟量的影响,并给出判断3种延迟量优劣的方法,最终提出一种根据高度角不同选择不同模型的综合算法,一定程度上解决了低角度的延迟量误差比较大的问题。
Fission Track Thermochronology Evidence for Multiple Periods of Mineralization in the Wulonggou Gold Deposits, Eastern Kunlun Mountains, Qinghai Province

It is a puzzle to determine metallogenetic ages in the world. This article uses zircon fission track (FT) dating to probe the mineralizing epochs of Wulonggou(五龙沟)gold ore deposits in eastern Kunlun (昆仑)Mountains. Total of six zircon FT ages have been obtained and can be divided into groups of 235-216 and 197-181 Ma, as well as 162 and 124 Ma, revealing multiple epochs of metallogenetic processes took place in Wulonggou area, mainly first two age groups. The mineralizing ages become lower from northeast Yanjingou (岩金沟)to southwest Hongqigou (红旗沟). The second epoch of 197-181 Ma is first achieved by this work. It is shown that the FT ages consist with other isotopic data and reflect different regional thermotectonic events.
The Impact Induced Demagnetization Mechanism in NdFeB Permanent Magnets

Compression of unmagnetized Nd_2Fe_(14)B permanent magnets is executed by using shock waves with different pressures in a one-stage light gas gun system. The microstructure, crystal structure, and magnetic properties of the magnets are examined with scanning electronic microscopy, x-ray diffraction, hysteresis loop instruments, and a vibrating sample magnetometer, respectively. The NdFeB magnets display a demagnetization phenomenon after shock wave compression. The coercivity dropped from about 21.4 kOe to 3.2 kOe. The critical pressure of irreversible demagnetization of NdFeB magnets should be less than 4.92 GPa. The coercivity of the NdFeB magnets compressed by shock waves could be recovered after annealing at 900°C and 520°C for 2 h, sequentially. The chaotic orientation of Nd2Fe14B grains in the compressed magnets is the source of demagnetization.
Phase-Shift Extraction and Wavefront Reconstruction in Generalized Phase-Shifting Interferometry with a Standard Phase Object

A method to extract phase shifts and reconstruct the object wave in generalized phase-shifting interferometry (GPSI) is proposed. The phase distribution of a standard phase object and the least-square method are used to extract phase shifts over a wide range from 0 to π. Consequently, the tested object wave can be further reconstructed with the extracted phase shifts. It is accurate and applicable for GPSI of any frame number N (N≥2). Computer simulation has verified its feasibility and validity.
Acceleration of the Stochastic Analytic Continuation Method via an Orthogonal Polynomial Representation of the Spectral Function

Stochastic analytic continuation is an excellent numerical method for analytically continuing Green's functions from imaginary frequencies to real frequencies, although it requires significantly more computational time than the traditional MaxEnt method. We develop an alternate implementation of stochastic analytic continuation which expands the dimensionless field n(x) introduced by Beach using orthogonal polynomials. We use the kernel polynomial method (KPM) to control the Gibbs oscillations associated with truncation of the expansion in orthogonal polynomials. Our KPM variant of stochastic analytic continuation delivers improved precision at a significantly reduced computational cost.
Supercontinent evolution: Preface

The evolution of the earth is marked by development of more than 70% of the present day continents during Archean. The Archean-Proterozoic boundary is characterized by continental amalgamation, and subsequent breaking and development of worldwide glaciations. The Paleoproterozoic time is characterized by change in atmospheric oxygen and intense biogenic activity during the early part, and amalgamation of the continents to form the supercontinent "Columbia", development of sulphidic ocean chemistry and disappearance of major BIF deposit formation towards the later part. The evolution patterns during Mesoproterozoic are not well understood till the formation of the supercontinent "Rodinia" during the Grenville orogeny. The breaking of "Rodinia" was associated with worldwide glaciations, significant increase in atmospheric oxygen and bloom in biological activities, Paleozoic glaciations were also associated with the breaking of Pangea and Gondwanaland. Mass extinction events and appearance of new organisms were related to the changes in ocean chemistry. The thematic section of Geoscience Frontiers was planned to synthesize available information to understand the relationship between supercontinent evolution, and changes in atmosphere, hydrosphere and biosphere.
A review of the~1600 Ma sedimentation,volcanism,and tectono-thermal events in the Singhbhum craton,Eastern India

The Palaeoproterozoic-Mesoproterozoic transition(~1600 Ma) is a significant event in the Earth history as a global thermal perturbation affected the pre-1600 Ma landmasses.Like other cratonic blocks of the world,lithospheric thinning,sedimentation,magmatism,metamorphism and crustal melting/anatexis are associated with this significant geological event in the Singhbhum cratonic province of India.This paper is a review of sedimentological,magmatic and tectono-thermal events in the Singhbhum craton at~1600 Ma.The Palaeo-Mesoproterozoic sedimentation and volcanism in the Singhbhum craton took place in a terrestrial intracontinental rift setting.The available geochronological data are indicative of late Palaeoproterozoic to Neoproterozoic tectono-thermal events in the Chhotanagpur Granite Gneissic Complex(CGGC),an east-west trending arcuate belt of granite gneisses,migmatites and metasedi-mentary rocks.A detailed multidisciplinary geo-scientific investigation of the Dalma volcanic belt and the area to its north(Chandil Formation) and further north in CGGC will enable us to constrain the extant surface processes and crust-mantle interactions,the collision events between the North and South Indian cratonic blocks,and the position of India in the Columbia supercontinent.
REE geochemistry of auriferous quartz carbonate veins of Neoarchean Ajjanahalli gold deposit,Chitradurga schist belt,Dharwar Craton,India

REE composition of the carbonates of the auriferous quartz carbonate veins(QCVs) of the Neoarchean Ajjanahalli gold deposit.Chitradurga schist belt.Dharwar Craton,is characterized by U-shaped chondrite normalized REE patterns with both LREE and HREE enrichment and a distinct positive Eu anomaly.As positive Eu anomaly is associated with low oxygen fugacity,we propose that the auriferous fluids responsible for gold mineralization at Ajjanahalli could be from an oxygen depleted fluid.The observed positive Eu anomaly is interpreted to suggest the derivation of the auriferous fluids from a mantle reservoir.The location of Ajjanahalli gold deposit in a crustal scale shear zone is consistent with this interpretation.
多电厂频繁低幅次同步振荡的现象模拟及抑制措施研究

频繁超过发电机轴系疲劳累积阈值的低幅次同步振荡会大幅降低机组轴系的服役年限,是近年来出现的次同步振荡新问题.以呼盟系统为研究对象,根据实际录波分析了多电厂机组出现频繁超标低幅次同步振荡的根本原因.计算了电气阻尼对次同步扭振相互作用环节中主要电气参量的敏感度,基于此提出了在触发角上施加扰动激励模态振荡的仿真方法.基于呼盟系统电磁暂态仿真模型,对宽带通和窄带通SSDC抑制该类型次同步振荡问题的局限性进行了分析.从响应时间和阻尼转矩提供能力两方面对比了SEDC与机端并联型FACTS装置的差异.分析表明,二者的响应时间较为接近,而FACTS装置提供阻尼转矩的能力却远强于SEDC.采用时域仿真法对比了SEDC,SVC以及STATCOM的抑制效果.综合考虑抑制效果和占地面积等因素,推荐STATCOM为优选的抑制方案.提出了适用于实际工程应用的级联型STATCOM的控制策略,对其抑制容量和输出特性进行了分析.结果表明,采用所提出的控制策略的STATCOM在较小容量下具有较好的抑制效果和输出特性.
辽河西部凹陷新生代构造变形及“郯庐断裂带”的表现

本文通过三维地震资料解释和构造制图分析了辽河西部凹陷断裂系统的构造几何学和运动学特征,论证了郯庐断裂在辽河西部凹陷的表现型式.研究表明如下几点:(1)辽河西部凹陷新生代构造可以划分为伸展构造和右旋走滑构造两种构造变形系统.伸展构造由一系列NNE-NE向的正断层构成,主要在古近纪发育,并控制了古近系的充填,使辽河西部凹陷古近系表现为发育在NNE-NE向的台安-大洼断层(F1)上盘、具有"东断西超"结构特征的一个复式半地堑断陷;右旋走滑构造包括2～3条NNE-NE向基底右旋走滑断层(F2,F3和F4)及其伴生构造,主要在渐新世以后发育,走滑相关的断层可以切割到新近系-第四系.(2)受基底走滑断层位置和走向变化的影响,辽河西部凹陷古近系复式半地堑断陷在中、北部与南部有明显不同的结构特征,在凹陷南部主要表现为伸展-走滑变形特征,仍保留"东断西超"的复式半地堑结构,而在凹陷北部主要表现为收缩-走滑构造变形特征,改造成为西侧受逆-走滑断层限制、东侧以反转正断层为边界的复杂"地堑"结构.(3)郯庐断裂带从辽东湾海域东部向北分为两支,其中东支向北纵贯辽河坳陷东部凹陷至沈阳附近与敦化-密山断裂连接,西支从辽河西部凹陷中北部、大民屯凹陷穿过并与依兰-伊通断裂相连;辽河西部凹陷的基底走滑断层属于"郯庐断裂带"西支渐新世以来发生右旋走滑位移的表现,切割了控制古近纪沉积凹陷的伸展断层,并诱导盆地盖层沿着基底走滑断裂带发育一系列近EW向的盖层正断层.
扬子西缘中元古代沉积地层锆石U-Pb年龄及Hf同位素组成

扬子西缘中元古代沉积地层为一套相对稳定的环境下沉积的碎屑岩-碳酸盐岩组合,夹有少量的凝灰岩和玄武岩.在不同地区,中元古代沉积地层分别被命名为昆阳群、会理群和东川群.通过对昆阳群、会理群和东川群中凝灰岩锆石U-Pb定年,结合对昆阳群和东川群碎屑岩中锆石U-Pb定年结果,表明昆阳群和会理群的沉积时代为1050～1000Ma之间,它们属于同时异相的沉积组合.依据碎屑锆石年龄以及Hf同位素特征,表明昆阳群和会理群的碎屑物质主要来自华夏地块.另外,获得东川群中的凝灰岩锆石U-Pb年龄为1500Ma,且东川群中的碎屑锆石年龄均大于1.5Ga,表明东川群的沉积时代为中元古代长城纪晚期,其碎屑物质主要来自扬子地块古老基底.通过对上述三套地层单元中不同类型锆石系统地Hf同位素测定,发现在1.5和1.0Ga左右,锆石的Hf初始值出现快速上升.已有研究表明,昆阳群和会理群是扬子和华夏地块在格林威尔期发生拼合后在扬子一侧形成的前陆盆地沉积建造.扬子和华夏从西向东是逐渐汇聚,并在0.9Ga于扬子东段最终完成汇聚,代表了Rodinia超大陆汇聚的最后阶段.锆石的Hf同位素表明,超大陆旋回和地壳增生具有密切联系.
A 30-dB 1-16-GHz low noise IF amplifier in 90-nm CMOS

This paper presents a high-gain wideband low-noise IF amplifier aimed for the ALMA front end system using 90-nm LP CMOS technology.A topology of three optimized cascading stages is proposed to achieve a flat and wideband gain.Incorporating an input inductor and a gate-inductive gain-peaking inductor,the active shunt feedback technique is employed to extend the matching bandwidth and optimize the noise figure.The circuit achieves a flat gain of 30.5 dB with 3 dB bandwidth of 1-16 GHz and a minimum noise figure of 3.76 dB.Under 1.2 V supply voltage,the proposed IF amplifier consumes 42 mW DC power.The chip die including pads takes up 0.53 mm~2,while the active area is only 0.022 mm~2.
A current-mode DC-DC buck converter with adaptive zero compensation

To achieve fast transient response for a DC-DC buck converter,an adaptive zero compensation circuit is presented.The compensation resistance is dynamically adjusted according to the different output load conditions, and achieves an adequate system phase margin under the different conditions.An improved capacitor multiplier circuit is adopted to realize the minimized compensation capacitance size.In addition,analysis of the small-signal model shows the correctness of the mechanism of the proposed adaptive zero compensation technique.A currentmode DC-DC buck converter with the proposed structure has been implemented in a 0.35μm CMOS process,and the die size is only 800×1040μm~2.The experimental results show that the transient undershoot/overshoot voltage and the recovery times do not exceed 40 mV and 30μs for a load current variation from 100 mA to 1 A.