mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
建国以来中国山洪灾害时空演变格局及驱动因素分析

本文揭示了建国以来中国山洪灾害时空演变格局,探测了影响历史山洪灾害空间分布的驱动因子.采用6万多个山洪灾害历史记录数据,利用重心对比方法,从重心地理位置、聚集程度、移动趋势3个方面揭示了1951~2015年中国山洪灾害时空演变特征,初步分析了降雨、人口与山洪灾害之间时空演变的关系.进一步选取2000~2015年间相关数据,基于自然流域单元,构建了降雨、人类活动、地表环境相关因子,利用地理探测器分析方法,探测影响历史山洪灾害空间分布的驱动因子.分析结果表明,建国以来,中国历史山洪灾害空间分布转移与降雨和人口分布的变化趋势呈现出明显的相关性; 2000~2015年间山洪灾害空间分布呈现出区域分异特征,降雨因子的驱动大于人类活动因子和地表环境因子,地表环境和人类活动在成灾环境中具有交互作用.研究结果揭示了山洪灾害驱动因子具有明显的时空异质性,中国山洪高风险区包括川渝生态区、华南生态区、云贵高原和长江中下游地区;低风险度区包括西北干旱区、青藏高原、内蒙古高原和东北生态区.研究结果有助于科学理解山洪成灾环境、山洪灾害风险度分区,也为进一步做好治灾防灾工作提供了科学依据.
中国二叠纪综合地层和时间框架

二叠纪发生了一系列全球性重大地质和生物事件,建立一个高精度的综合地层和时间框架是阐明这些重大事件因果关系的基础.国际二叠纪年代地层系统分为3统(乌拉尔统、瓜德鲁普统和乐平统)和9个阶,在中国分为3统(船山统、阳新统、乐平统)和8个阶,除乐平统以外,船山统和阳新统与国际标准划分时限有很大不同.二叠纪历经约4700万年,底界以牙形类Streptognathodus isolatus首现为标志,绝对年龄约为(298.9±0.15)Ma,顶界以牙形类Hindeodus parvus的首现为界,绝对年龄约为(251.902±0.024)Ma.二叠系在中国可识别出35个牙形带、23个䗴带、17个放射虫带和20个菊石带,其中华南瓜德鲁普统和乐平统牙形类化石带可作为国际对比的标准.二叠纪 δ~(13)Ccarb变化趋势表明在二叠纪最末期有一次3~5‰的快速负漂在全球范围内可以对比,但其他时段可能或多或少受到后期成岩作用影响或仅具有地方性效应.牙形类的δ~(18)Oapatite变化趋势表明从石炭纪晚期至空谷期处于一个较冷的时期,空谷晚期开始气候逐渐变暖.长兴期是一个气候较冷期,在二叠纪末有一次8~10°C的快速升高,这次温度升高全球同时发生. ~(87)Sr/~(86)Sr比值由阿瑟尔初期的0.7080持续降低至卡匹敦晚期的最低值0.7068~0.7069;乐平世则持续上升,到二叠-三叠系界线处, ~(87)Sr/~(86)Sr比值达到0.70708.磁性地层以沃德阶中部Illawarra反向为界,以下称为Kiaman超级反向极性带,以上称为二叠-三叠纪超级混合极性带.瓜德鲁普世末期的生物灭绝事件发生在卡匹敦晚期,持续时间长.二叠纪末的生物大灭绝事件发生于约(251.941±0.037)Ma,是突发性的.瓜德鲁普世末期的大海退在华南地区主要发生在Jinogondolella xuanhanensis至Clarkina dukouensis带之间;二叠纪最末期从大海退转入快速海侵发生在Hindeodus changxingensis-Clarkina zhejiangensis带内.二叠纪是一个古地理区系强烈分异的时期,中国各大区的海陆相二叠系对比存在诸多需要进一步研究的问题.
中国寒武纪综合地层和时间框架

寒武纪是显生宙第一纪,见证了动物的爆发式快速演化过程,标志着地球从微生物为主导的前寒武纪生态系统转变为以动物为特征的显生宙生态系统.然而,全球寒武纪地层对比困难,高分辨率年代地层系统还未完全建立,严重制约寒武纪地球-生命系统演化历史的研究.文章简要介绍国际寒武系四统十阶年代地层系统的形成历史和已经建立的幸运阶、鼓山阶、古丈阶、排碧阶和江山阶的定义与“金钉子”(GSSP),概述第二阶、第三阶、第四阶、第五阶和第十阶底界厘定工作进展,重点阐述寒武系底界的全球对比问题,以及寒武纪化学地层和同位素年代学的研究现状和存在问题.在简要回顾中国寒武纪年代地层研究历史的基础上,根据国际寒武纪年代地层研究进展,对以华南为基础的中国寒武纪年代地层和时间框架进行了修订,新建肖滩阶作为中国寒武系第二阶.全面介绍中国华南、华北和塔里木三个主要构造地层分区寒武纪综合地层(生物地层、化学地层和同位素年代学)研究进展,并对中国不同地层分区寒武系底部地层发育特征、底界识别和存在问题进行分析和讨论;同时还对三个主要地层分区寒武系上部白云岩地层的划分与对比提出建议.
青藏高原东北缘地壳P波速度结构及其对地壳变形研究的启示

青藏高原东北缘同鄂尔多斯块体及阿拉善块体过渡地区,也是南北地震带的北段;该区地震活动水平较高,是发生强震危险性较大的地区.鉴于该区特殊的构造环境和深部构造背景,本研究利用两条“十字交叉”的地震宽角反射/折射剖面进行相互约束,以更为精确地获得研究区各个块体及其耦合部位的深、浅部地壳速度结构特征,进而探讨历史强震区的深部孕震构造环境.文章对两条剖面获得的P波数据进行了资料处理和解释,采用地震射线走时正演构建了沿两条剖面的二维地壳速度结构模型.结果显示:两条剖面所穿过的不同块体速度结构、地壳内部界面形态及地壳厚度等存在较大差异.其中,沿兰州-惠安堡-榆林地震测深剖面(L1)的地壳厚度由鄂尔多斯块体西缘的43.0km向西加深至祁连块体的55.9km.同时,鄂尔多斯块体速度等值线横向变化平缓,地壳平均速度为6.30km s~(-1);而祁连块体和弧形构造区壳内结构变化较为剧烈,壳内平均速度低于鄂尔多斯块体0.10km s~(-1)左右.此外,祁连块体与弧形构造区上地壳存在不连续低速层(LVZ1和LVZ2),低于周围介质速度0.10~0.20km s~(-1);鄂尔多斯块体在L2(铜川-惠安堡-阿拉善左旗地震测深剖面)和L1剖面上平均地壳厚度基本一致,均在43.0km左右起伏变化,但沿L1剖面壳内界面、速度等值线平缓,显示稳定的克拉通式地壳结构特征,而沿L2剖面壳内速度等值线变化紊乱,显示鄂尔多斯块体壳内结构具有显著区域差异.贺兰山造山带和银川盆地地壳结构呈现“隆凹”起伏变化,表现出局部挤压变形特征,且在贺兰山中-下地壳存在高低速相间的低速层,低于周围介质速度0.15~0.25km s~(-1).阿拉善块体地壳厚度为49.0km左右,该块体上、中-下地壳层内速度等值线起伏形态差异较大.沿L1、L2地震测深剖面获得的复杂地壳速度结构特征揭示了不同地块的结构差异、相互耦合关系及历史强震区的速度结构,从而为进一步研究该区强震的孕育环境和机制提供了更为精确的地壳结构约束.
Sm-Co high-temperature permanent magnet materials

Permanent magnets capable of reliably operating at high temperatures up to ~ 450 ℃ are required in advanced power systems for future aircrafts, vehicles, and ships. Those operating temperatures are far beyond the capability of Nd- Fe-B magnets. Possessing high Curie temperature, Sm-Co based magnets are still very important because of their high- temperature capability, excellent thermal stability, and better corrosion resistance. The extensive research performed around the year 2000 resulted in a new class of Sm2(Co, Fe, Cu, Zr)_(17)-type magnets capable of operating at high temperatures up to 550 ℃. This paper gives a systematic review of the development of Sm-Co permanent magnets, from the crystal structures and phase diagrams to the intrinsic magnetic properties. An emphasis is placed on Sm2(Co, Fe, Cu, Zr)_(17)-type magnets for operation at temperatures from 300 ℃ to 550 ℃. The thermal stability issues, including instantaneous temperature coefficients of magnetic properties, are discussed in detail. The significance of nanograin structure, nanocrystalline, and nanocomposite Sm-Co magnet materials, and prospects of future rare-earth permanent magnets are also given.
Versatile GaInO_3-sheet with strain-tunable electronic structure, excellent mechanical flexibility, and an ideal gap for photovoltaics

Due to many remarkable physical and chemical properties, two-dimensional (2D) nanomaterials have become a hot spot in the field of condensed matter physics. In this paper, we have studied the structural, mechanical, and electronic properties of the 2D GaInO_3 system by first-principles method. We find that 2D GaInO_3 can exist stably at ambient condition. Molecular dynamic simulations show that GaInO_3-sheet has excellent thermal stability and is stable up to 1100 K. Electronic structural calculations show that GaInO_3-sheet has a band gap of 1.56 eV, which is close to the ideal band gap of solar cell materials, demonstrating great potential in future photovoltaic application. In addition, strain effect studies show that the GaInO_3-sheet structure always exhibits a direct band gap under biaxial compressive strain, and as the biaxial compressive strain increases, the band gap gradually decreases until it is converted into metal. While biaxial tensile strain can cause the 2D material to transform from a direct band gap semiconductor into an indirect band gap semiconductor, and even to metal. Our research expands the application of the GaInO_3 system, which may have potential application value in electronic devices and solar energy.
Exploration of the structural and optical properties of a red-emitting phosphor K_2TiF_6:Mn~(4+)

The exploration of the appropriate red phosphor with good luminescence properties is an important issue in the development of current white light-emitting diode (WLED) devices. Transition metal Mn-doped compounds are fascinating luminescent materials. Herein, we performed a systematic theoretical study of the microstructure and optical properties of K_2TiF_6:Mn~(4+) using the CALYPSO structure search method in combination with first-principles calculations. We uncovered a novel structure of K_2TiF_6:Mn~(4+) with space group P-3m1 symmetry, where the impurity Mn~(4+) ions are accurately located at the center of the MnF6 octahedra. Based on our developed complete energy matrix diagonalization (CEMD) method, we calculated transition lines for 2Eg ! 4A2, 4A2 ! 4T2, and 4A2 ! 4T2 at 642 nm, 471 nm, and 352 nm, respectively, which are in good agreement with the available experimental data. More remarkably, we also found another transition (4A2 ! 2T2) that lies at 380 nm, which should be a promising candidate for laser action.
Accurate calculation of electron affinity for S_3

The accurate equilibrium structures of S_3 and S_3~- are determined by the coupled-cluster method with single, double excitation and perturbative triple excitation (CCSD(T)) with basis sets of aug-cc-pV(n+d)Z (n = T, Q, 5, or 6), complete basis set extrapolation functions with two-parameters and three-parameters, together with considering the contributions due to the core-valence electron correlation, scalar relativistic effects, spin-orbit coupling, and zero-point vibrational corrections. Our calculations show that both the neutral S_3 and anion S_3~- have open forms with C2v symmetry. On the basis of the stable geometries, the adiabatic electron affinity of S_3 is determined to be 19041(11) cm~(-1), which is in excellent agreement with the experimental data (19059(7) cm~(-1)). The dependence of geometries and electron affinity on the computation level and physical corrections is discussed. The present computational results are helpful to the experimental molecular spectroscopy and bonding of S_3.
Novel infrared differential optical absorption spectroscopy remote sensing system to measure carbon dioxide emission

A CO_2 infrared remote sensing system based on the algorithm of weighting function modified differential optical absorption spectroscopy (WFM-DOAS) is developed for measuring CO_2 emissions from pollution sources. The system is composed of a spectrometer with band from 900 nm to 1700 nm, a telescope with a field of view of 1.12°, a silica optical fiber, an automatic position adjuster, and the data acquisition and processing module. The performance is discussed, including the electronic noise of the charge-coupled device (CCD), the spectral shift, and detection limits. The resolution of the spectrometer is 0.4 nm, the detection limit is 8.5×10~(20) molecules·cm~(-2), and the relative retrieval error is < 1.5%. On May 26, 2018, a field experiment was performed to measure CO_2 emissions from the Feng-tai power plant, and a twodimensional distribution of CO_2 from the plume was obtained. The retrieved differential slant column densities (dSCDs) of CO_2 are around 2×10~(21) molecules·cm~(-2) in the unpolluted areas, 5.5×10~(21) molecules·cm~(-2) in the plume locations most strongly affected by local CO_2 emissions, and the fitting error is less than 2×10~(20) molecules·cm~(-2), which proves that the infrared remote sensing system has the characteristics of fast response and high precision, suitable for measuring CO_2 emission from the sources.
Average fidelity estimation of twirled noisy quantum channel using unitary 2τ-design

We propose a method to estimate the average fidelity using the unitary 2t-design of a twirled noisy channel, which is suitable for large-scale quantum circuits. Compared with the unitary 2-design in randomized benchmarking, the unitary 2t-design for the twirling of noisy channels is more flexible in construction and can provide more information. In addition, we prove that the proposed method provides an efficient and reliable estimation of the average fidelity in benchmarking multistage quantum gates and estimating the weakly gate- and time-dependent noise. For time-dependent noise, we provide a scheme of moment superoperator to analyze the noise in different experiments. In particular, we give a lower bound on the average fidelity of a channel with imperfect implementation of benchmarking and state preparation and measurement errors (SPAM).
Astrocyte syncytium: a functional reticular system in the brain

In contrary to the discrete neuronal circuits, astrocytes share their cytoplasm through gap junctional coupling into a syncytium. This distinctive difference in neuronal and astrocytic anatomy recalls the historical debate between Camillo Golgi and Ramon y Cajal on the wiring principle of the nervous system over a century ago (Cimino, 1999). At that neuron-centric era, the Cajal advocated the cell theory that considered the nervous system to be made up of discrete individual cells. Golgi on the other hand favored the reticular theory that viewed the nervous system as a singular continuing network system. Nevertheless, regardless of the difference in their viewpoints, both theories were intended to postulate an anatomical blueprint of neural circuitry, with no attention given to neuroglia. It was until the 1950s, the distinct membrane borders between synapses were revealed by electron microscopy, which means that neurons are indeed discrete individual cells. This declared Ramon y Cajal’s cell theory the victor in the debate, while Golgi’s reticular theory was disregarded. However, the existence of a “low-resistance pathway” between neuroglia was soon identified in the optic nerve in the 1960s (Kuffler et al., 1966), which we now know to be gap junction coupling that connects the cytoplasm of astrocytes into a syncytial network. Ever since, decades of studies clearly demonstrated that syncytial coupling into the network is a most prominent feature of astrocytes and these glial networks are intimately interwoven with the neuronal circuits running across the entire central nervous system (Giaume et al., 2010). Surprisingly, the question of whether a reticular system exists in parallel with the neuronal circuits has received a little research attention to this day. Interestingly, the wiring pattern of astrocyte syncytium is reminiscent of the reticular theory postulated by Golgi. In this perspective, the “revived” use of “reticular theory” is solely dedicated to the brain reticular system established by astrocytes.
Resting-state network complexity and magnitude changes in neonates with severe hypoxic ischemic encephalopathy

Resting-state functional magnetic resonance imaging has revealed disrupted brain network connectivity in adults and teenagers with cerebral palsy. However, the specific brain networks implicated in neonatal cases remain poorly understood. In this study, we recruited 14 termborn infants with mild hypoxic ischemic encephalopathy and 14 term-born infants with severe hypoxic ischemic encephalopathy from Changzhou Children’s Hospital, China. Resting-state functional magnetic resonance imaging data showed efficient small-world organization in whole-brain networks in both the mild and severe hypoxic ischemic encephalopathy groups. However, compared with the mild hypoxic ischemic encephalopathy group, the severe hypoxic ischemic encephalopathy group exhibited decreased local efficiency and a low clustering coefficient. The distribution of hub regions in the functional networks had fewer nodes in the severe hypoxic ischemic encephalopathy group compared with the mild hypoxic ischemic encephalopathy group. Moreover, nodal efficiency was reduced in the left rolandic operculum, left supramarginal gyrus, bilateral superior temporal gyrus, and right middle temporal gyrus. These results suggest that the topological structure of the resting state functional network in children with severe hypoxic ischemic encephalopathy is clearly distinct from that in children with mild hypoxic ischemic encephalopathy, and may be associated with impaired language, motion, and cognition. These data indicate that it may be possible to make early predictions regarding brain development in children with severe hypoxic ischemic encephalopathy, enabling early interventions targeting brain function. This study was approved by the Regional Ethics Review Boards of the Changzhou Children’s Hospital (approval No. 2013-001) on January 31, 2013. Informed consent was obtained from the family members of the children. The trial was registered with the Chinese Clinical Trial Registry (registration number: ChiCTR1800016409) and the protocol version is 1.0.
Paternal physical exercise modulates global DNA methylation status in the hippocampus of male rat offspring

It is widely known that maternal physical exercise is able to induce beneficial improvements in offspring cognition; however, the effects of paternal exercise have not been explored in detail. The present study was designed to evaluate the impact of paternal physical exercise on memory and learning, neuroplasticity and DNA methylation levels in the hippocampus of male offspring. Adult male Wistar rats were divided into two groups: sedentary or exercised fathers. The paternal preconception exercise protocol consisted of treadmill running, 20 minutes daily, 5 consecutive days per week for 22 days, while the mothers were not trained. After mating, paternal sperm was collected for global DNA methylation analysis. At postnatal day 53, the offspring were euthanized, and the hippocampus was dissected to measure cell survival by 5-bromo-2'-deoxiuridine and to determine the expression of synaptophysin, reelin, brain-derived neurotrophic factor and global DNA methylation levels. To measure spatial memory and learning changes in offspring, the Morris water maze paradigm was used. There was an improvement in spatial learning, as well as a significant decrease in hippocampal global DNA methylation levels in the offspring from exercised fathers compared with those from sedentary ones; however, no changes were observed in neuroplasticity biomarkers brain-derived neurotrophic factor, reelin and 5-bromo-2'-deoxiuridine. Finally, the global DNA methylation of paternal sperm was not significantly changed by physical exercise. These results suggest a link between paternal preconception physical activity and cognitive benefit, which may be associated with hippocampal epigenetic programming in male offspring. However, the biological mechanisms of this modulation remain unclear.
Diffusion kurtosis imaging of microstructural changes in brain tissue affected by acute ischemic stroke in different locations

The location of an acute ischemic stroke is associated with its prognosis.The widely used Gaussian model-based parameter,apparent diffusion coefficient (ADC),cannot reveal microstructural changes in different locations or the degree of infarction.This prospective observational study was reviewed and approved by the Institutional Review Board of Xiamen Second Hospital,China (approval No.2014002).Diffusion kurtosis imaging (DKI) was used to detect 199 lesions in 156 patients with acute ischemic stroke (61 males and 95 females),mean age 63.15 ± 12.34 years.A total of 199 lesions were located in the periventricular white matter (n = 52),corpus callosum (n = 14),cerebellum (n = 29),basal ganglia and thalamus (n = 21),brainstem (n = 21) and gray-white matter junctions (n = 62).Percentage changes of apparent diffusion coefficient (ΔADC) and DKI-derived indices (fractional anisotropy [ΔFA],mean diffusivity [ΔMD],axial diffusivity [ΔD_a],radial diffusivity ΔD_r,mean kurtosis [ΔMK],axial kurtosis [ΔK_a],and radial kurtosis [ΔK_r]) of each lesion were computed relative to the normal contralateral region.The results showed that (1) there was no significant difference in ΔADC,ΔMD,ΔD_a or ΔD_r among almost all locations.(2) There was significant difference in ΔMK among almost all locations (except basal ganglia and thalamus vs.brain stem;basal ganglia and thalamus vs.gray-white matter junctions;and brainstem vs.gray-white matter junctions.(3) The degree of change in diffusional kurtosis in descending order was as follows:corpus callosum >periventricular white matter >brainstem >gray-white matter junctions >basal ganglia and thalamus >cerebellum.In conclusion,DKI could reveal the differences in microstructure changes among various locations affected by acute ischemic stroke,and performed better than diffusivity among all groups.
Pharmacogenomics in Parkinson's disease: which perspective for developing a personalized medicine?

Every disease treatment is ideally finalized to prevent symptom occurrence, to stop or slow down the progression of disease, to alleviate complications already present and consequently to improve the quality of life for each patient. Unfortunately, in Parkinson's disease (PD) a treatment able to completely cure the disease is not so far available. Indeed, until now, the current therapies only allow to control the disease symptoms, without ensuring a long term efficacy and without reducing the risk to develop adverse drug reactions. The actual gold standard therapy consists in levodopa treatment, often used in combination with dopamine receptor agonists, catechol-O-methyltransferase (COMT) inhibitors or monoamine oxidase inhibitors. While the treatment with levodopa ameliorates the motor function of the patients, not all patients reach the therapeutic effect and many develop motor complications after using the drug for a prolonged time. On the other side, the dopamine receptor agonist drugs can cause psychosis, visual hallucinations, excessive daytime sleepiness, compulsive behavior and impulse control disorders, while the COMT inhibitors can induce hepatotoxicity. Variability in drug response is a multifactorial character that depends on clinical, environmental and genetic factors. In the last decades, the increasing knowledge in the human genome inter-individual variability led genetics and pharmacogenomics to assume a central role for the study and development of personalized and stratified medicine, with the claimed aim to decrease the number of adverse drug reactions and to increase the efficacy of drug therapy. Although in some fields, such as oncology and psychiatry, pharmacogenomics studies have already allowed the identification and validation of genomic biomarkers able to stratify groups of patients and to guarantee a personalized and precision medicine, in PD this is unfortunately still far to reach.
移动MES系统在半导体制造中的设计应用

MES系统在半导体智能制造中已经开始广泛应用,在智能制造技术的背景下,依托5GWIFI网络平台,设计并实现了一种在PDA上可以操作的移动MES系统并投入某净化间实际使用,减少了人力成本,杜绝了手工输入的风险,取得了良好的效益。
脾硬化性血管瘤样结节性转化合并症状性门静脉高压二例

笔者搜集2例经手术病理证实的脾硬化性血管瘤样结节性转化(SANT)合并症状性门静脉高压的患者.胃镜检查示食管胃底静脉重度曲张.例1患者增强CT检查示脾内多发类圆形占位,门静脉主干及脾静脉明显增粗,呈瘤样扩张.MR增强扫描示脾脏明显增大,脾内可见多发不均匀高信号结节影.例2患者CT检查示门静脉及脾静脉扩张及食管胃底静脉增粗;脾脏肿大,增强后可见大小不等的结节状染色,呈弥漫性分布.SANT影像表现有一定的特征,增强扫描CT及MRI均从动脉期到延迟期呈现逐渐向心性充填的辐轮状强化,明确诊断需要依靠病理.
Thermal Analysis and Identification of Potential Fire-proof Energy Building Material Based on Artificial Leather

Artificial leather fire-proof materials have obtained a good market due to stable production quality and low production price.Three kinds of artificial leather materials (polyvinyl chloride artificial leather (PVC),polyurethane artificial leather (PU) and polyurethane/polyvinyl chloride artificial leather (PU/PVC)) have been investigated,and then seven analysis methods were introduced to identify the materials.Thermo-gravimetric analysis indicated the materials had fine thermal stability.Fire-proof testing revealed the artificial leather materials had good flame retardancy,which could improve the applicability of fire-proof building materials.Tearing examination results indicated that there was a clear distinction between PVC and PU.The PU displayed significant differences compared with PVC or PVC/PU through pH indicator to observe the color of the pyrolysis gas aqueous solution.The dissolution tests results showed that cyclohexanone,dichloromethane and dimethylformamide (DMF) were efficient solvents that could be used for identifying PVC,PU and PU/PVC.The ATR-FTIR,a way to provide the high discriminating ability for identifying artificial leathers,indicated that the artificial leathers had different infrared characteristic peaks.In addition,the main compositive materials of the artificial leathers could be inferred by the relative contents analysis of N and Cl in artificial leathers.
Fish Assemblage Responses to a Low-head Dam Removal in the Lancang River

Dam removal is becoming an effective approach for aquatic biodiversity restoration in damming river in order to balance the aquatic ecosystem conservation with large-scale cascade damming. However, the effects of dam removal on fish communities in Asian mountainous rivers, which are dominated by Cypriniformes fishes, are still not well known. To determine whether dam removal on a mountainous river benefit restoration of fish diversity, we investigated the response of fish assemblage to dam removal using a before-after-control-impact design in two tributaries of the Lancang River (dam removal river: the Jidu River, and control river: the Fengdian River). Fish surveys were conducted one year prior to dam removal (2012) and three years (2013–2015) following dam removal. We observed rapidly and notably spatio-temporal changes in fish biodiversity metrics and assemblage structure, occurring in the Jidu River within the first year after dam removal. Overall, fish species richness, density and Shannon-Wiener diversity all increased immediately in above-and below-dam sites, and maintained a stable level in subsequent years, compared to unchanged situation in the control river. All sites in the Jidu River experienced shifts in fish composition after dam removal, with the greatest temporal changes occurred in sites below-and above-the former dam, resulting in a temporal homogenization tendency in the dam removed river. These findings suggest that dam removal can benefit the recovery of habitat conditions and fish community in Asian mountainous rivers, but the results should be further evaluated when apply to other dammed rivers since the dam age, fluvial geomorphology and situation of source populations could all affect the responses of fish assemblages.
经皮腔内血管成形术/支架植入术联合瑞舒伐他汀治疗下肢动脉硬化闭塞症远期疗效分析

下肢动脉硬化性闭塞症(ASO)是一类常见的下肢缺血性病变,并与年龄相关。随着我国人口进入老龄化阶段,ASO的发病率逐年增高。由下肢动脉粥样硬化斑块形成,导致下肢动脉狭窄、闭塞,进而导致肢体慢性缺血。高血脂是引发动脉粥样硬化的重要因素之一,降脂联合管腔内介入治疗可显著降低ASO术后再狭窄风险。