mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Effects of Land Cover on Soil Organic Carbon Stock in a Karst Landscape with Discontinuous Soil Distribution

Land cover type is critical for soil organic carbon(SOC) stocks in territorial ecosystems. However, impacts of land cover on SOC stocks in a karst landscape are not fully understood due to discontinuous soil distribution. In this study, considering soil distribution, SOC content and density were investigated along positive successional stages(cropland, plantation, grassland, scrubland, secondary forest, and primary forest) to determine the effects of land cover type on SOC stocks in a subtropical karst area. The proportion of continuous soil on the ground surface under different land cover types ranged between 0.0% and 79.8%. As land cover types changed across the positive successional stages, SOC content in both the 0–20 cm and 20–50 cm soil layers increased significantly. SOC density(SOCD) within 0–100 cm soil depth ranged from 1.45 to 8.72 kg m~(-2), and increased from secondary forest to primary forest, plantation, grassland, scrubland, and cropland, due to discontinuous soil distribution. Discontinuous soil distribution had a negative effect on SOC stocks, highlighting the necessity for accurate determination of soil distribution in karst areas. Generally, ecological restoration had positive impacts on SOC accumulation in karst areas, but this is a slow process. In the short term, the conversion of croplandto grassland was found to be the most efficient way for SOC sequestration.
Spatiotemporal Dynamics of a Paramo Ecosystem in the Northern Ecuadorian Andes 1988-2007

Paramo is a term used to describe tropical alpine vegetation between the continuous timberline and the snow line in the Northern Andes. Paramo environments provide important species habitat and ecosystem services. Changes in spatial extent of the paramo ecosystem at Pambamarca in the Central Cordillera of the northern Ecuadorian Andes were analysed using multi-temporal Landsat TM/ETM+ satellite data. The region suffered a loss of 1826.6 ha or 20% of the total area at a rate of 100 ha/annum during 1988-2007 period. It is found that permanent paramo cover decreased from 8350 ha in 1988 to 5864 ha in 2007 at a fairly constant rate(R2=0.94). This loss is attributed to expansion of commercial agriculture and floriculture in the valleys coupled with increased population pressure. Land at higher elevations has been cleared for small scale agriculture. Loss of the paramo ecosystem will exert a number of negative impacts on ecosystem services and livelihoods of the local population at Pambamarca.
Alpine Activity Patterns of Mitopus morio(Fabricius, 1779) are Induced by Variations in Temperature and Humidity at Different Scales in Central Norway

Our research addresses questions about how micro-climate affects activity abundance of a common and widespread harvestman in an alpine ecosystem. Activity patterns of the Harvestman Mitopus morio(Fabricius, 1779) were studied along different alpine gradients in the central Norwegian Scandes. Within a nested design, we surveyed 18 alpine habitats with pitfall traps and microclimatological equipment along oceanic-continental, two elevational, and(fine-scaled) microtopographic gradients. Sites in the oceanic region of the Scandes showed generally higher abundance of M. morio than sites in the continental region. Furthermore, along the elevational gradient, middle-alpine sites showed higher abundances than low-alpine sites. These general patterns are best explained by higher humidity in the oceanic region and in the middlealpine belt. Focusing at a finer scale, i.e. one elevational level within each region, revealed partly opposing activity patterns within relatively short distances. While in the western middle-alpine belt these patterns were best explained by humidityrelated measures but now with higher activity abundance during drier conditions, in the drier eastern middle-alpine belt heat sums rather than humidity were found to be the best explanatoryvariables for the observed patterns. Hence, our results imply a pronounced different reaction of the two populations towards climatic variables that partly even contradict the previously described general pattern. Regardless whether these differences in activity abundance in M. morio are a form of phenotypic plasticity or adaptation, our findings stress the importance of detailed autecological knowledge combined with fine-scaled climatic measurements when aiming at predictions about possible future ecosystem structures and spatiotemporal phenomena. M. morio proves to be an ideal biogeographic model organism for understanding spatio-temporal responses of alpine ecosystems under modified climatic conditions.
Long-term Activity of Earthquake-induced Landslides: A Case Study from Qionghai Lake basin, Southwest of China

Earthquake-triggered landslides are a major geological hazard in the eastern Tibetan Plateau, and have prolonged impact on earth surface processes and fluvial system. To determine how long co-seismic landslides affect basins, a massive number of landslides existing in Qionghai Lake Basin were investigated for landslide distribution characteristics and geomorphological evidences, with further comparison and analysis using historic seismic analog method. The landslides found in Qionghai Lake Basin showed clear features of seismic triggering with strongly controlled by Zemuhe fault. These landslides are still active at present. Some new slides generally occur in ancient slope failure zones causing serious secondary hazards in recent years. In this study we strengthen the idea that the landslides triggered by the 1850 Xichang earthquake(MS7.5) have long term activity and prolonged impact on the mountain disasters with a period of more than 160 years. Our results support growing evidence that co-seismic landslides have a prolonged effect on secondary disasters in a basin, and invite more careful consideration of the relationship between current basin condition and landslide history for a longer period.
食管黏膜单纯性滤泡颗粒状病变的内镜特点及检出率

食管炎依据感染源可分为病毒感染、细菌感染、霉菌感染及螺旋体或寄生虫感染等;依据炎性病变性质可分为化脓性食管炎、念珠菌性食管炎、食管结核病、疱疹性食管炎、反流性食管炎、食管Crohn病及腐蚀性或放射性食管炎等;依据病理特点又可分为单纯性卡他食管炎、化脓性食管炎和坏死性食管炎等急性类型及单纯性慢性食管炎、反流性食管炎和Barrett食管炎等慢性类型。但在临床上使用内镜对食管炎的诊疗过程中,我们发现有一些并不能明确其分型的单纯性滤泡颗粒状食管黏膜病变,其具有某些独特的内镜表现。总结报告如下。
Perturbations of Moore–Penrose Metric Generalized Inverses of Linear Operators in Banach Spaces

In this paper,the perturbations of the Moore–Penrose metric generalized inverses of linear operators in Banach spaces are described.The Moore–Penrose metric generalized inverse is homogeneous and nonlinear in general,and the proofs of our results are different from linear generalized inverses.By using the quasi-additivity of Moore–Penrose metric generalized inverse and the theorem of generalized orthogonal decomposition,we show some error estimates of perturbations for the singlevalued Moore–Penrose metric generalized inverses of bounded linear operators.Furthermore,by means of the continuity of the metric projection operator and the quasi-additivity of Moore–Penrose metric generalized inverse,an expression for Moore–Penrose metric generalized inverse is given.
内皮素与神经系统疾病关系的研究进展

血管内皮细胞合成并释放一种具有强烈收缩血管作用的物质称为内皮素,其主要作为一种体液性介质参于许多疾病,可作为内皮细胞受损的分子标志物,通过影响血管功能状态来参与心、脑、肺及肾脏疾病的发生,尤其是心脑血管疾病的发病过程。文献总结发现,多种神经系统疾病发病时血清内皮素(ET)水平明显增高,且经治疗后ET水平明显降低,但仍高于正常水平。内皮素在神经系统疾病的发病、病变程度、疾病的进展以及疾病的预后中具有重要的意义。
论升降思想在伤寒论方中的应用

在研究《内经》、《伤寒论》的过程中发现,《内经》中的升降思想在《伤寒论》的方剂中得到了很好的体现。故从《伤寒论》桂枝加厚朴杏子汤、桂枝加桂汤、半夏泻心汤、大承气汤等代表方剂着手,简述升降思想在《伤寒论》方中的运用。
钩“益火补土”法之隐微

依据五脏分属五行而论,心属火,脾属土,火与土者母子相生也。火不生土,应有心火或命门之火衰微,不能温煦脾土及外因所致脾胃寒盛火微之分,其益火之法亦当有补心、温肾以暖脾土之别。对益火补土法内涵的阐释虽观点颇不相同,但旨在为治疗脾土疾病提供新思维。
抗旱型优质高产啤酒大麦新品种云啤9号

云啤9号是云南省农业科学院生物所暨国家大麦青稞体系西南区育种团队采用夏繁冬播1年2代育种技术于2010年育成的二棱型啤酒大麦新品系。2006年以澳选3号为母本和曲152为父本配组,2010年10月稳定后在云南省5个州市进行小区面积为10 m~2,3次重复,随机区组6个点多点试验,2011~2012年度参加云南省啤酒大麦品种区试,2012年申请农业部植物品种新品种权保护(申请号: 20120877.2),并于2013年通过云南省非主要农作物品种登记(编号:滇登记大麦2012001号)。
不同株型玉米根系及其与地上部的相关性研究

本研究利用盆栽方法,对平展型和紧凑型玉米苗期根系性状及其与地上部的相关性进行了研究。结果表明,2种株型根系生物量与地上部生物量、地上部绿叶面积均呈显著正相关。与平展型玉米相比,紧凑型玉米苗期表现出根系夹角小,水平分布集中,根系更加粗壮的特点,这为紧凑型玉米耐密植,获得更高的群体产量奠定了基础。
水稻转基因技术及其应用和展望(连载二)

抗除草剂基因转化主要采用基因枪法和农杆菌介导法,实现对草丁膦、草甘膦等除草剂的抗性。抗除草剂基因转入水稻后,不但可以获得抗除草剂水稻品种,成功解决直播稻的化学除草问题;也可以作为一个遗传标记导入杂交稻组合,解决杂交稻制种纯度问题。
A new species of the genus Micropeplus Latreille (Coleoptera: Staphylinidae: Micropeplinae) from China

A new species of the genus Micropeplus Latreille is described under the name of M. songi sp. nov. Color photos of habitus, head, pronotum, elytra, wing, metasternum, the 3rd to 7th tergites of abdomen, the 8th sternite, and aedeagus are provided. This species was found on fungi from Mt. Wahui in Jiulong County, Sichuan, China.
Comparative morphological study on the genus Leptura Linnaeus of China (Coleoptera: Cerambycidae: Lepturinae)

A comparative morphological research was done based on the morphological characters of 21 species from Leptura in this paper. The results indicated that 18 morphological characters, such as the ratio of the lower eye lobe to genae, the relative length of antennae segments, the shape of maxillary palpi apex, prothorax, elytra apex and elytral maculae can be used to identify species in the genus. Meanwhile, the color of elytra and the size of elytral maculae could not be used to identify species from Leptura. In addition, the shape of 7th abdominally sternal apex, the length of antennae and the ratio of the first hind tarsal segment to the second can be used to distinguish the male and the female.
A new record ant species of the genus Cardiocondyla Emery from China (Hymenoptera: Formicidae)

An ant species, Cardiocondyla gibbosa Kuznetzov-Ugamsky, 1927, is newly recorded from China. The specimens were collected from Shule County of Kashgar, Xinjiang （39°14N， 76° 22'E； elev. 1248 m）. All the specimens are kept in Institute of Zoology， Shaanxi Normal University. A key based on worker caste to known species of Cardiocondyla from China is provided.
Chinese species of the genus Prochiloneurus Silvestri with description of a new species (Hymenoptera: Encyrtidae)

Four species of the genus Prochiloneurus Silvestri, belonging to the family Encyrtidae of Hymenoptera, are reported from China. Among them, P. stenopterus sp. nov., which is reared as the hyperparasitoid of Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae), an invasive mealybug to China, is reported as new to science. A key of the genus is provided for the recognition of the females of Chinese species. Notes on the parasitoid and hyperparasitoid of the mealybug Phenacoccus solenopsis are provided.
蔬菜大棚作业人员氡暴露水平及辐射剂量估算

为了解蔬菜大棚作业人员氡暴露水平及变化趋势，初步估算作业人员年均辐射剂量，于2012年3—12月，采用Model 1027连续测氡仪对蔬菜大棚内的氡浓度进行连续监测。结果显示，3、6、10、12月氡浓度均值分别为408.1、113.4、132.7、537.3 Bq/m~3,蔬菜大棚作业人员辐射剂量分别为1.0、0.3、0.3和1.4 mSv，年总辐射剂量为3.0 mSv。提示蔬菜大棚内氡浓度处于较高水平，且冬季最高。
中国荨麻疹诊疗指南(2014版)

荨麻疹是由于皮肤、黏膜小血管扩张及渗透性增加出现的一种局限性水肿反应。临床上特征性表现为大小不等的风团伴瘙痒,可伴有血管性水肿。慢性荨麻疹是指风团每周至少发作2次,持续≥6周者。少数慢性荨麻疹患者也可表现为间歇性发作。
2014年美国成人高血压指南是进步还是倒退？

从1976年美国预防、检测、评估与治疗高血压全国联合委员会的第1次报告(JNC 1)到2003年的JNC 7，叱咤风云数十年。千呼万唤始出来的JNC 8，是循证医学的典范。严谨、科学，仅收集随机对照试验(RCT)，而对于其他观察性研究证据，均排除在外。然而RCT覆盖不了临床实践涉及的所有问题，有其局限性。JNC 8有很多重要的理念均未提到,笔者认为有一些不足之处，主要如下。
自发性椎管内硬膜外血肿保守治疗3例报告

自发性椎管内硬膜外血肿(spontaneous spinal epidural hematoma,SSEH )是指原因不清、非外伤性和医源性因素导致的血液在硬脊膜外腔非特异性的聚集。多数学者认为椎板切除减压、血肿清除为治疗的最佳选择，但也有少数学者报道了保守治疗的病例。2009年1月?2013年12月，我们保守治疗了SSEH患者3例，均获得满意疗效，报告如下。
胸椎管狭窄症临床诊疗中面临的争议与挑战

近20年来，胸推管狭窄症的临床诊疗逐渐在全国普遍开展，相关的临床与基础研究水平也有了较大提高。但是，关于胸推管狭窄症的病因及其自然发生規律依然存在诸多未知。与颈腰推疾患相比，其诊断与治疗更为困难，手术并发症多、风险更大，疗效及预后存在不确定因素等。如何进一步深入认识胸推管狭窄症，提高临床诊疗水平，还面临着很多问题与挑战。
砂岩中碳酸盐胶结物成岩流体演化和水岩作用模式—以川西孝泉-丰谷地区上三叠统须四段致密砂岩为例

碳酸盐胶结物是川西坳陷孝泉-丰谷地区须四段第一重要的胶结物类型.通过碳酸盐胶结物岩石学、矿物学、碳氧同位素以及包裹体均一温度等的系统分析,讨论了研究区须四段致密砂岩中不同类型碳酸盐胶结物的沉淀机制、孔隙流体演化以及分布规律.连晶方解石胶结物具有相对较重的碳、氧同位素(δ~(13)C=2.14‰,δ~(18)O=-5.77‰),沉淀时间早,是在常温常压条件下,直接从过饱和碱性湖水介质中析出的产物.沉淀时流体的氧同位素较轻,主要表现为大气水-海水混合流体的特征(δ~(18)O=-3‰),说明研究区须四段沉积时期的沉淀流体同时受到了大气水和海水的影响;次生孔隙中充填的方解石胶结物具有相对较轻的碳、氧同位素(δ~(13)C=-2.36‰,δ~(18)O=-15.68‰),沉淀时间晚,主要沉淀于中、晚侏罗沉积期的埋藏作用阶段,反映了有机质参与的长石溶蚀过程是该类碳酸盐胶结物沉淀的重要物质来源,粘土矿物转化过程中释放的Ca~(2+),Fe~(3+)和Mg~(2+)离子也是其重要的物质来源之一.由于埋藏过程中,水岩相互作用的影响,沉淀时流体的氧同位素出现了较明显增大(增重3‰左右);钙屑砂岩中的白云石胶结物沉淀于中侏罗沉积期的埋藏作用阶段,与碳酸盐岩屑具有类似的较重的碳氧同位素特征(δ~(13)C=1.93‰,δ~(18)O=-6.11‰),说明了两者在来源上的一致性,沉淀时流体氧同位素显著偏重(δ~(18)O=2.2‰左右).不同胶结物沉淀时流体氧同位素的差异体现了不同水岩相互作用体系或是不同水岩相互作用强度的影响.这是含较多刚性颗粒的砂岩具有相对偏负的碳同位素(岩屑石英砂岩)、沉淀流体具有相对偏重氧同位素(钙屑砂岩)的主要原因.
嘌呤能G蛋白偶联受体P2Y_(12)与一种抗血栓药形成复合物的晶体结构

随着2012年诺贝尔化学奖的揭晓,人们的目光再次被聚焦到了人体内最大的膜受体蛋白家族G蛋白偶联受体(G protein coupled receptor, GPCR),由于其重要的生理、病理功能以及特殊的蛋白结构使之成为目前最热门的药物治疗靶点,给生物医药产业的发展带来了巨大的契机.为此,中国近年来不断加大对重要G蛋白偶联受体结构与功能研究的投入,相继在“国家重点基础研究计划”、“重大新药创制”等计划中设立专项开展系统研究.日前,由国家重大科学研究计划项目“重要G蛋白偶联受体的结构与功能研究及配体发现”(2012CB910400)课题组长中国科学院药物所赵强研究员领衔的科研团队在自然杂志报道了P2Y_(12)受体与一种非核苷酸类可逆性拮抗剂AZD1283的2.7A晶体结构,为基于该受体的靶向药物的研发奠定了坚实的理论基础.
排山楼金矿韧性剪切带演化过程

野外地质调查、室内显微构造及石英EBSD组构分析等综合研究表明,排山楼金矿区发育了三期韧性剪切活动,并先后形成了东西向、北东向延伸的韧性剪切带.前者主要表现为右行压扭活动,后者切割了前者,先后经历了左行压扭、左行走滑-伸展等多期构造活动.东西向韧性剪切带中发育大量多晶石英条带与云母的显微构造分层现象,形成于较深的地壳层次及中高温的环境下,石英结晶学优选(CPO)表明石英以柱面
负性情绪调节的效率: 中国文化背景下认知重评与表达抑制的对比

本研究探讨了中国人采用表达抑制和认知重评调节负性情绪的时间动态特征.被试采用自由观看、表达抑制和认知重评策略观看情绪图片,观看图片的同时采集事件相关电位活动(ERP).结果表明,被试在两种策略下自我报告的负性情绪水平有相似的降低.此外,表达抑制相比认知重评条件在额中央区诱发了更大的P3成分(340~480ms).更重要的是,相比自由观看条件,表达抑制条件下在800~1000ms,1000~1200ms,1200~1400ms及1400~1600ms时间窗内晚期正电位(LPP)波幅均出现显著下降.相反,在认知重评条件下,除了在1400~1600ms时间窗内LPP波幅相比自由观看显著降低;在其他时间窗口内认知重评与自由观看条件均没有显著差异.LPP波幅与负性情绪的评分存在正相关,而P3波幅预测了自我报告的表达抑制水平.这些结果提示,对中国被试而言,表达抑制比认知重评能更快地降低负性情绪唤起水平,但同时也消耗了更多的认知资源.
中国胸腔镜肺叶切除临床实践指南

自1992年Roviaro等报道了首例完全腔镜下解剖性肺叶切除以来,胸腔镜手术(video-assisted thoracoscopic surgery,VATS)已有了飞跃的发展。美国胸外科医师协会普胸外科数据库(STS GTSD)显示,VATS解剖性肺切除(肺叶切除术和肺段切除术)的比例从2003年的8%上升到2013年的30% 。由于VATS的“微创”特点,极大地减少了传统开胸手术的创伤,如术后疼痛程度轻且缓解快、对肩关节功能影响小、更好地保护了肺功能、减少了术后创伤因子的产生、更好地保护了免疫功能,明显改善了患者术后的生活质量且促进快速康复。此前,VATS肺叶切除术应用于肺癌治疗一直存在争议,但在严格掌握适应证的前提下,仍体现了微创的巨大优越性,成为肺癌诊治的重要手段之一。随着微创手术技术和器械的不断发展、手术经验的积累和手术患者良好长期生存率报道的不断涌现,肺癌的手术模式开始出现改变。2006年,美国国立综合癌症网络(NCCN)发布的肺癌治疗指南开始提出VATS肺叶切除对于可切除的肺癌是一种可行的选择,初步明确了VATS在肺癌外科治疗中的地位;2018年最新版NCCN指南更是明确提出VATS是可切除肺癌的推荐手术方式。目前,VATS肺叶切除术已基本趋于成熟并获得广泛认可,其手术操作技术也在逐渐细化并日臻完善。
中国锂电池技术与产业发展20年

过去20年,中国锂离子电池技术及产业均取得巨大进步,锂离子电池材料体系从钴酸锂发展到磷酸铁锂、三元材料,再到高镍和富锰体系,负极从石墨到多元碳材料、再发展到含锂合金以至锂金属.同时,制造技术从作坊式生产发展到自动化和今日的智能化,产业规模不断扩大,中国已经成为全球最大的锂离子电池生产地和消费地.展望未来,技术发展趋势是高比能量、高比功率、高安全、长寿命、低成本,全固态电池、新原理轻金属电池、定制产品将取得技术突破.产业将是智能无人化、规模联盟化、细分专业化.
Seabed domes with circular depressions in the North Yellow Sea

Numerous isolated shallow seabed domes with depressions were discovered in the North Yellow Sea in a high-resolution multibeam echosounder survey. Twelve domes were located within a 11 km by 17 km survey area. The domes in this area were between 0.1 m and 1.0 m high with diameters ranging from 250 to 1 700 m. They were surrounded by corresponding depressions and displayed characteristic shapes ranging from circular to elliptical. The acoustic anomalies displayed on the high resolution sub-bottom profile images demonstrated that shallow gas accumulated just beneath these domes, suggesting that the migration and accumulation of the shallow gas caused the formation of these features. Accumulation atop the seabed domes and erosion within the depressions, as indicated by the lithological features of the sediment cores, suggested that seabed bottom currents also played a role in the formation and evolution of these features. In addition, the simultaneous decrease in the chlorite and sulfate content in core d pore water samples confirmed the presence of submarine fresh/brackish groundwater, which is of interest for hydrological budgets and may be a significant component of the regional hydrologic balance. Our findings suggested that shallow gas accumulation and migration are likely coupled to localized groundwater discharge at this domed site.
No-Load Iron Loss Model for a Fractional-Slot Surface-Mounted Permanent Magnet Motor Based on Magnetic Field Analytical Calculation

The common analytical models for the no-load iron loss of permanent magnet(PM) motors usually neglect the iron loss caused by the rotating magnetic field in the tooth tips and the harmonics of the magnetic fields in the teeth and yokes. This paper presents an analytical model for no-load iron loss of a fractional-slot surface-mounted permanent magnet motor. According to the existing analytical model of the magnetic field distribution in the slotted air gap, the magnetic flux densities considering the harmonics of the stator tooth and yoke are both derived based on the continuity of magnetic flux. Due to the complexity of the magnetic field in the tooth tip, the tangential flux density of the tooth tip is approximated by an equivalent sine wave and the radial component is regarded to be the same as that of the corresponding tooth. After obtaining the magnetic fields in stator different regions, the analytical iron loss is calculated by using the Bertotti model and the orthogonal decomposition model. A 20-pole/24-slot PM synchronous motor is taken as an example. The maximum error between the analytical model and finite element model(FEM) is 5.46%, which verifies the validity of the proposed method.
Microgrid Relay Protection Scheme Based on Harmonic Footprint of Short-Circuit Fault

Due to the low overcurrent capacity of the inverter-based microgrid, traditional overcurrent protect is not suitable for the entire power system including microgrid. A fast detecting method and a whole protection scheme is needed to identify the fault and keep the system stable. This paper proposes a microgrid relay protection scheme combining a fast fault detection algorithm and low voltage ride through(LVRT) strategy. The detection algorithm combines a new harmonic analysis method and impedance delay which can complete fault detection within several milliseconds. Under a fault condition, the LVRT strategy utilizes an enhanced phase-locked loop(EPLL) to allow the microgrid to operate under unbalanced conditions for a period of time. In addition, for the dispatch requirements of power system, it also has communication based power compensation functionality. The scheme given in this paper is verified by simulation, verifying feasibility of its application in practice.
Resonance Active Damping and PCC Voltage Quality Improvement of DFIG System Connected to Parallel Compensated Grid

Under the connection to a weak grid, the Doubly Fed Induction Generator(DFIG) based wind power system has potential risk from two operational issues. The first issue is the High Frequency Resonance(HFR) mode due to the impedance interaction between the DFIG system and the weak grid. In order to ensure safe and reliable operation of the DFIG system, it is necessary to implement effective active damping strategies to mitigate the HFR. The second issue is low order voltage harmonic distortion at the Point of Common Coupling(PCC), where consequently the performance of other grid-connected devices may deteriorate. It could be advantageous that the DFIG system is able to improve the voltage quality at PCC by eliminating the low order harmonic components. In this paper, both of the above mentioned DFIG operational characters, i.e., active damping of HFR and the improvement of voltage quality at PCC, will be achieved by implementing advanced control strategies in the Rotor Side Converter(RSC) and the Grid Side Converter(GSC) respectively. Simulations are provided to verify the proposed control strategies for DFIG system connected to a weak grid.
马列主义视野下大学生创新创业教育的研究——评《化工行业大学生创新创业基础教程》

如今,在经济全球化进程中,知识经济已成为全球经济发展的推动力。在这种情况下,随着经济的迅速发展,将会出现更多的高科技产业,从而使科学和技术成为生产力的第一个组成部分。只有当一个国家具有强大的创新、独立和强大的能力时,它才能在具有竞争力的环境中处于无敌地位。就业一直是影响世界所有国家经济发展的一个突出问题,并为社会稳定和全面发展发挥了重要作用。如果现代大学生能够改变传统的就业观念并承担企业家精神的历史责任,他们就可以创造大量的就业机会并解决更多的就业问题。因此,教育是解决社会就业问题的有效手段。
妊娠禁忌与安胎中药

妊娠禁忌中药主要分为毒性禁忌、偏性禁忌、功效禁忌、用量禁忌四类,其不良结果主要是抗早孕、诱发引产、导致胎儿畸形、遗传及生殖毒性。一种观点认为,没有具有直接作用的安胎中药,安胎是通过辨证论治祛除引起胎动不安的母体病因来实现的;而另一种观点则认为,安胎中药确有特殊成分,有直接安胎作用。基于此,对妊娠期中药使用做出六点总结。
不同时间间隔体外冲击波治疗脑卒中后小腿三头肌痉挛的疗效观察

目的:观察不同时间间隔体外冲击波治疗脑卒中后小腿三头肌痉挛状态的疗效,为临床应用体外冲击波治疗脑卒中后小腿三头肌痉挛状态提供参数依据。方法:选取脑卒中后小腿三头肌痉挛状态患者62例,按随机数字表法随机分为连续治疗组和间隔治疗组,每组患者31例。两组患者在常规康复治疗的基础上,均接受体外冲击波治疗,连续治疗组患者治疗参数设置冲击频率为8Hz,压强为2.0—3.0bar,冲击次数为2000次,1次/日,连续3日,每周共3次,共4周;间隔治疗组患者治疗参数设置为冲击频率为8Hz,压强为2.0-3.0bar,冲击次数为2000次,隔日1次,每周3次,共4周。于治疗前、治疗后2周和4周采用关节被动活动度(PROM)、改良Ashworth量表(MAS)和简化的Fugl-Meyer评分法(FMA)分别评定两组患者患侧踝关节被动背伸角度、小腿三头肌痉挛状态和下肢运动功能。结果:治疗前两组患者PROM值、MAS评分和FMA评分行组间比较,差异无显著性意义(P>0.05);治疗2周后,连续治疗组和间隔治疗组患者踝关节PROM分别为(48.40±7.02)度和(39.53±7.91)度,小腿三头肌MAS评分分别为(1.65±0.51)分和(2.13±0.46)分、FMA评分分别为(18.65±8.23)分和(14.39±6.84)分,均较治疗前显著改善,差异有显著性意义(P< 0.05),行组间比较,连续治疗组较间隔治疗组改善明显,有显著性意义(P< 0.05);治疗4周后,连续治疗组和间隔治疗组患者踝关节PROM分别为(57.28±8.61)度和(54.37±8.76)度,小腿三头肌MAS评分分别为(1.47± 0.39)分和(1.56±0.40)分、FMA评分分别为(24.39±9.62)分和(23.76±8.52)分,均较治疗前显著改善,差异有显著性意义(P< 0.05),行组间比较,差异无显著性意义(P> 0.05)。结论:体外冲击波能显著改善脑卒中后小腿三头肌的痉挛状态,连续治疗方案的短期疗效优于间隔治疗方案,而两种治疗方案的长期疗效无显著差异。
Characteristics of the First Occurrence of Jurassic Petroleum in the Zagros Basin, Iran

After two well tests in the Asmari well#A, located in the North Dezful zone, it was concluded that in the Jurassic Mus/Alan/Neyriz and Upper Sargelu reservoirs, highly mature colorless oil and gas were trapped, including 4%-6% H_2S. The alternation of Garau shale and the Gotnia anhydrite seal was so efficient that it did not allow the upward migration of petroleum from Jurassic reservoirs to higher levels. Descriptive ratios, chromatograms, pick correlation and cross plots demonstrated that the oil and gas have been derived from a TOC-enriched sequence, consisting of the base of the Garau and the top of the Sargelu Formations. This highly organic matter-rich sequence is traceable as an oil shale in other parts of the North Dezful zone, such as the Gashun section. The petroleum accumulations in both reservoirs are identical, have the same maturity and the same source. Diagrams of δ~(13)C_2 versus δ~(13)C_3, δ~(13)C_1 versus wetness of gas (C_1/C_2+C_3) and δ~(13)C_1 versus δDC_1 suggest that the gas is derived from a highly mature source. There are indications of TSR effects on the original petroleum that could have changed the volumetric and isotopic composition of the oil and gas. This result requires more careful study of the petroleum components to be undertaken.
Carbon Isotopic Evolution Characteristics and the Geological Significance of the Permian Carbonate Stratotype Section in the Northern Upper-Yangtze Region, Southern China

The Permian global mass extinction events and the eruption of the Emeishan flood basalts in the Upper Yangtze region should display certain responses during the evolution of carbon isotope. In this paper, the Permian carbon isotopic evolution in the Upper Yangtze region is examined through systematic stratotype section sampling and determination of 13C in the northern Upper-Yangtze regions and Southern China. Additionally, the carbon isotopic evolution response characteristics of the geological events in the region are evaluated, comparing the sea-level changes in the Upper Yangtze region and the global sea-level change curves. Results of this study indicated that the carbon isotopic curves of the Permian in the Upper Yangtze region are characterized by higher background carbonisotope baseline values, with three distinct negative excursions, which are located at the Middle-Late Permian boundary and the late period and end of the Late Permian. The three distinct negative excursions provide an insightful record of the global Permian mass extinction events and the eruption of the Emeishan flood basalts in the Upper Yangtze region. The first negative excursion at the Middle-Late Permian boundary reflected the eruption of the Emeishan flood basalts, a decrease in sea level, and biological extinction events of different genera in varying degrees. The second negative excursion in the Late Permian included a decrease in sea level and large-scale biological replacement events. The third negative excursion of the carbon isotope at the end of the Permian corresponded unusually to a rise rather than a decrease in sea level, and it revealed the largest biological mass extinction event in history.