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Reconstruction of surface deformation characteristics in alpine canyons under shadow conditions

Journal of Mountain Science 2022年第11期19卷 3105-3117页

作者： gu zhen-kui YAO Xin Key Laboratory of Neotectonic Movement and Geohazard Institute of GeomechanicsChinese Academy of Geological SciencesBeijing 100081China Research Center of Neotectonism and Crustal Stability China Geological SurveyBeijing 100081China

Monitoring deformation in high undulating mountainous environments is critical for surface process research and disaster prevention studies. Although observations based on interferometric Synthetic Aperture Radar(InSAR) are an excellent tool for monitoring deformation, the shadow phenomena can limit its application. Based on a series of geomorphic parameters and limited InSAR observation data, surface deformations were reconstructed in areas with missing observations by constructing a random forest model to compensate for the shadow phenomenon at the grid-scale. The findings suggest that this method can be used to rebuild landscape variation characteristics in places where observation data is lacking. The dominant slope direction in the observation area corresponded to a more significant correlation between the reconstructed topography deformation characteristics and the observation. In addition, when building this model, consideration was given to the geomorphic parameter selection, elevation variation, hypsometric integral value, slope form, lithology, slope variation,and aspect variation;these parameters can significantly affect the surface deformation, which is closely related to their spatial autocorrelation. These findings are significant for eliminating the shadow phenomenon, which often occurs in In SAR observations taken over alpine canyon regions. The terrain and lithology of the underlying surface should be considered when reconstructing the surface deformation characteristics of the shadow region by using satellite observation data.

关键词： Alpine canyon region Surface deformation Shadow InSAR Geomorphic parameter

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Dynamical characteristics of geomorphologic evolution of the basins covered by Pisha-sandstone in the eastern wing of the Ordos Plateau, China

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Journal of Mountain Science 2018年第5期15卷 1046-1056页

作者： gu zhen-kui SHI Chang-xing Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China

There are several basins with high sediment yield in the Pisha-sandstone covering area of the east wing of the Ordos Plateau. Due to the lack of targeted research on the dynamical characteristics of geomorphic evolution that plays an important role in the sand production, this paper analyzed the tectonic activity intensity and erosion characteristics of the area. The results show that the intensity of tectonic activities in the area is generally moderateweak and shows an unconspicuous increase from north to south. Tectonic activity is manifested mainly in the form of uplift. The uplift rate in the lower reaches of each basin is greater than the erosion rate,which is prominent in the Kuyehe and the Tuweihe rivers. During the uplift of the regional topography,the most serious parts under erosion are generally concentrated in the upstream and midstream of basins. All longitudinal profiles of the basins have a shape close to an exponential function, which indicates that they are in the early stage of erosion evolution. The mechanisms of geomorphologic evolution of these basins have a great similarity. The conservative estimate of historical average erosion rate was less than 182–520 t/(km^2·yr), much less than that of the modern times. The average stream power values are typically distributed between 4 and102 W/m, with the larger being in the Kuyehe and the Tuweihe rivers and the smallest being in the Qinshuihe River. The maximum stream power value appears in the downstream reach, which should be the main reason for the particles being directly injected into the Yellow River. From the perspective of geomorphological evolution, the current soil and water conservation measures can hardly cure the erosion of these basins in the long run.

关键词： Dynamic characteristics Geomorphologic evolution Ordos Plateau Tectonicactivity Stream power Geomorphological parameter

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Quantitative analysis of the macro-geomorphic evolution of Buyuan Basin, China

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Journal of Mountain Science 2019年第5期16卷 1035-1047页

作者： gu zhen-kui FAN Hui SONG Zhao-jun Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security Yunnan University Institute of International Rivers and Eco-Security Yunnan University Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals College of Earth Science and Engineering Shandong University of Science and Technology

Buyuan River, the largest tributary within the Chinese Lancang-Mekong River region downstream of the Jinghong Dam, plays a crucial role in river function and ecosystem service of the Lancang-Mekong River. The geomorphic evolution of a basin exerts a key control on riverine sediment input and transport. In this study, the geomorphic characteristics of Buyuan Basin are analyzed using morphological parameters, hydrodynamic parameters and the stream power river incision model. The results show that: 1) The slight north-south difference of channel density is most likely due to lithology and independent of tectonic activity and climate. 2) The weak tectonic activity and the low hypsometric integral(HI) value suggest that the macroscopic landform condition limits erosion and sediment production. 3) The logarithmic longitudinal profile of the main channel defends that the upstream sediments generated by erosion are easily deposited in the downstream channel, rather than being transported directly into the Lancang-Mekong River. 4) Approximately 74% of the reaches have annual average stream power less than 500 W·m^(-1). The narrow variation ranges of stream power in 50% of the river channel indicate relatively stable hydrodynamic environment. 5) Stream erosion and tectonic activity make the longitudinal profiles of the main channel and most tributary channels unstable. The wide range(between 22.01 and 45.58 with θ=0.43) of steepness index(k_(sn)) of longitudinal profiles implies differential uplift in the basin.

关键词： Geomorphic parameters Steepness index Stream power Lancang-Mekong River

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Controls on geomorphic characteristics of the Xiaohei River basin in the upper Lancang-Mekong, China

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Journal of Mountain Science 2020年第5期17卷 1032-1044页

作者： gu zhen-kui FAN Hui LOU Jun-peng YANG Kun Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security Institute of International Rivers and Eco-SecurityYunnan UniversityKunming 650091China Department of Hydraulic Engineering Tsinghua UniversityBeijing 10084China

Understanding the evolution of the fluvial geomorphology in an orogenic belt provides valuable insight into the relationship between upper crustal deformation and surface *** upper Lancang-Mekong River is in an area experiencing both uplift and *** related processes provide a steady sediment supply to the lower reaches of the river and play an important role in the regional environmental *** Xiaohei(Weiyuan)River Basin is an important sub-basin in this area,which is characterized by large-scale topographic fluctuations,active tectonics and erosion,and anthropogenic *** different factors introduce numerous complexities to the local surface *** this study,we investigate and quantify the controls of geomorphic evolution of the Xiaohei River *** located and mapped the main knick-zones within the channels and examined the main genetic factors,such as faults and stratigraphic *** results show that the areas with the lowest uplift rates are characterized by a low steepness index and are located in the southeastern part of the *** stream power of the mainstream increases downstream,with an average value of^122 W/*** erosional activity of the various stream channels is ***,the basin tends to expansion,with only local instances of inward *** analysis confirms that a number of the geomorphic evolutionary characteristics of the Xiaohei River Basin are *** addition,the future potential for the increasing the number of dams and the hydropower development in the basin may weaken the expansion trend of the basin over a long period of time.

关键词： Longitudinal profile Steepness Divide migration Stream power Hydropower development Lancang

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Mapping of geomorphic dynamic parameters for analysis of landslide hazards:A case of Yangbi river basin on the upper Lancang-Mekong of China

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Journal of Mountain Science 2021年第9期18卷 2402-2411页

作者： gu zhen-kui YAO Xin YAO Chuang-chuang LI Cheng-gang Key Laboratory of Active Tectonics and Geological Safety Institute of GeomechanicsChinese Academy of Geological S ciencesMinistry of Natural ResourcesBeijing 100081China Research Center of Neotectonism and Crustal Stability China Geological SurveyBeijing 100081China Shandong zhengyuan Geological Resources Exploration Co.Ltd. Jinan 250013China

Landslides are common hazards in orogenic belt ***,it is difficult to quantitatively express the driving effects of tectonic uplift and stream erosion on the occurrence of landslides on large spatial scales by conducting field *** this study,we analyzed a relatively large region that extends over the Yangbi River basin on the upper Lancang-Mekong in China.A series of quantitative indices,including kernel density of the landslide(KDL),hypsometric integral(HI),steepness index(ksn),stream power(?),and stream power gradient(ω)were used to explore the promoting effects of tectonic uplift and stream action intensity on landslides by mapping geomorphic dynamic parameters combined with actual landslide *** analysis showed that the HI value in the highest landslide risk area was approximately 0.47,and that the KDL in the region can be expressed as a function of steepness or stream power gradient of the channel network,namely,KDL=0.0127 Ln ksn-0.0167(R2=0.72,P<0.001)and KDL=0.0219 Lnω-0.0558(R2=0.21,P<0.02).Therefore,the lower reach of the Yangbi River basin,with higher steepness and stream power gradient,usually has a high uplifting rate and stream incision that drives landslides and causes the entire river network system to be in a stage of longterm active ***,the results suggest that sediments were being rapidly discharged from the steep tributary channels to the *** practical situation highlights that the downstream area of the river basin is a high-risk area for landslide hazards,especially in association with heavy rainfall and earthquakes.

关键词： Fluvial activity Tectonic uplift Steepness Landslide Lancang

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Pathogenesis, diagnosis, and treatment of epilepsy: electromagnetic stimulation-mediated neuromodulation therapy and new technologies

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Neural Regeneration Research 2025年第4期20卷 917-935页

作者： Dian Jiao Lai Xu zhen gu Hua Yan Dingding Shen Xiaosong gu Academy of Medical Engineering and Translational Medicine Tianjin UniversityTianjinChina Key Laboratory of Advanced Drug Delivery Systems of Zhejiang Province College of Pharmaceutical SciencesZhejiang UniversityHangzhouZhejiang ProvinceChina Affiliated Hospital of Nantong University NantongJiangsu ProvinceChina

Epilepsy is a severe,relapsing,and multifactorial neurological *** regarding the accurate diagnosis,prognosis,and in-depth pathogenesis are crucial for the precise and effective treatment of *** pathogenesis of epilepsy is complex and involves alterations in variables such as gene expression,protein expression,ion channel activity,energy metabolites,and gut microbiota *** results are lacking for conventional treatments for *** resection of lesions,drug therapy,and non-drug interventions are mainly used in clinical practice to treat pain associated with ***-pharmacological treatments,such as a ketogenic diet,gene therapy for nerve regeneration,and neural regulation,are currently areas of research *** review provides a comprehensive overview of the pathogenesis,diagnostic methods,and treatments of *** also elaborates on the theoretical basis,treatment modes,and effects of invasive nerve stimulation in neurotherapy,including percutaneous vagus nerve stimulation,deep brain electrical stimulation,repetitive nerve electrical stimulation,in addition to non-invasive transcranial magnetic stimulation and transcranial direct current *** studies have shown that electromagnetic stimulation-mediated neuromodulation therapy can markedly improve neurological function and reduce the frequency of epileptic ***,many new technologies for the diagnosis and treatment of epilepsy are being ***,current research is mainly focused on analyzing patients’clinical manifestations and exploring relevant diagnostic and treatment methods to study the pathogenesis at a molecular level,which has led to a lack of consensus regarding the mechanisms related to the disease.

关键词： diagnosis drug treatment electroencephalography epilepsy monitoring epilepsy nerve regeneration neurostimulation non-drug interventions pathogenesis prediction

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气候变化和人类活动对黄河上游十大孔兑水沙过程的影响

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干旱区地理 2018年第3期41卷 472-479页

作者：姚海芳师长兴顾畛逵河北师范大学旅游系河北石家庄050024 中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室北京100101

随着气候的变化以及人类活动的加剧,世界上一些河流的径流和输沙量发生了明显的改变。查明流域的水沙特征、变化趋势及驱动因素是流域治理和管理中面临的重要问题。以黄河上游的十大孔兑为研究对象,利用1958—2015年的实测资料,采用线... 详细信息

随着气候的变化以及人类活动的加剧,世界上一些河流的径流和输沙量发生了明显的改变。查明流域的水沙特征、变化趋势及驱动因素是流域治理和管理中面临的重要问题。以黄河上游的十大孔兑为研究对象,利用1958—2015年的实测资料,采用线性趋势法、非参数Mann-Kendall趋势检验法对典型孔兑毛不拉、西柳沟、罕台川的年降雨、径流、泥沙、洪水过程进行了系统分析。结果表明:毛不拉和西柳沟年水沙序列下降趋势显著,罕台川下降趋势不显著,但近10 a比之前水沙明显减少;三个孔兑21世纪和20世纪观测到的2次洪水过程相比,产生洪水的降雨差别不大,但后一次洪峰流量和含沙量都显著降低;与1990年之前相比,1991—2015年各孔兑高强度降雨变化程度相对水沙变化不大。通过遥感影像解译,发现自20世纪90年代以来,随着退耕还林还草、封禁、休牧等水土保持工程陆续实施,十大孔兑土地利用变化显著,植被盖度明显增加,由此改变了该区域降雨—产流—产沙过程,引起1990年以后产水产沙的剧烈减少。

关键词：径流输沙气候变化人类活动十大孔兑

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内蒙古十大孔兑流域地貌演化格局及其成因机制

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干旱区地理 2017年第6期40卷 1188-1197页

作者：顾畛逵师长兴阳辉刘晓菲中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室北京100101 中国科学院大学北京100049

地貌演化是地貌学研究的重要内容之一。通过选择若干反映地貌演化特征综合性较强的指标,以30 m分辨率的DEM数据为基础,对内蒙古十大孔兑流域的地貌演化格局进行了研究。在借助灰色GM(1,1)模型对研究区地貌演化特征的空间变化规律进行分... 详细信息

地貌演化是地貌学研究的重要内容之一。通过选择若干反映地貌演化特征综合性较强的指标,以30 m分辨率的DEM数据为基础,对内蒙古十大孔兑流域的地貌演化格局进行了研究。在借助灰色GM(1,1)模型对研究区地貌演化特征的空间变化规律进行分析的同时,进一步结合构造活动、岩性特征及气候演变对孔兑流域地貌景观的成因机制及形成效应进行了探讨。结果表明:十大孔兑各流域目前除罕台川为接近壮年期的幼年地貌以及壕庆河为老年期地貌之外尚处于壮年期演化阶段,孔兑流域在未来较长时期内产沙潜力仍然巨大,其入黄泥沙中来自上游砒砂岩区的粗砂及库布齐沙漠沙分别在长短期尺度上扮演着重要角色;孔兑区所受的内外营力对抗作用或侵蚀强度以西部大于东部、中上游区表现突出为特点,其原因主要与西侧地表隆升程度较高有关,而降雨的空间差异对地貌演化效应的影响相对较小;与之相反,主沟纵剖面却以东部流域演化程度较高为特点,这主要与东部地表本身抬升程度低而慢有关,其次与东部降雨量略多以及岩性特征可能也存在一定关系。此外,从地貌景观的西高东低格局的形成时间考虑,其演化和发育时间主要集中在第四纪以来,期间由于气候变化可能经历过若干次"慢-快"发育的交互变化过程。

关键词：十大孔兑地貌演化 GM(1,1)模型构造活动岩性气候效应

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Design of a cationic accelerator enabling ultrafast ion diffusion kinetics in aqueous zinc-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 377-384页

作者： Yawei Xiao Qianqian gu Haoyu Li Mengyao Li Yude Wang National Center for International Research on Photoelectric and Energy Materials School of Materials and Energy Yunnan University Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources School of Chemistry and Chemical Engineering Hainan University College of Chemical Engineering Fuzhou University Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies Yunnan University

Aqueous zinc-ion batteries are highly favored for grid-level energy storage owing to their low cost and high safety,but their practical application is limited by slow ion *** address this,a strategy has been developed to create a cation-accelerating electric field on the surface of the cathode to achieve ultrafast Zn2+diffusion *** employing electrodeposition to coat MoS2on the surface of BaV6O16·3H2O nanowires,the directional built-in electric field generated at the heterointerface acts as a cation accelerator,continuously accelerating Zn2+diffusion into the active *** optimized Zn2+diffusion coefficient in CC@BaV-6O16·3H2O@MoS2(7.5×10～8cm2s-1) surpasses that of most reported V-based ***,MoS2serving as a cathodic armor extends the cycling life of the Zn-CC@BaV6O16·3H2O@MoS2full batteries to over 10000 *** work provides valuable insights into optimizing ion diffusion kinetics for high-performance energy storage devices.

关键词： Internal electric field Cationic accelerator Ion diffusion kinetics Cathode modification strategy Aqueous zinc ion battery

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The dopaminergic system and Alzheimer's disease

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Neural Regeneration Research 2025年第9期20卷 2495-2512页

作者： Yuhan Zhang Yuan Liang Yixue gu International Medical College Chongqing Medical UniversityChongqingChina College of Pharmacy Chongqing Medical UniversityChongqingChina Department of Neurology The First Affiliated Hospital of Chongqing Medical UniversityChongqing Key Laboratory of NeurologyChongqingChina

Alzheimer's disease is a common neurodegenerative disorder in older *** its prevalence,its pathogenesis remains unclea *** addition to the most widely accepted causes,which in clude excessive amyloid-beta aggregation,tau hyperphosphorylation,and deficiency of the neurotransmitter acetylcholine,numerous studies have shown that the dopaminergic system is also closely associated with the occurrence and development of this *** is a crucial catecholaminergic neurotransmitter in the human ***-associated treatments,such as drugs that target dopamine receptor D and dopamine analogs,can improve cognitive function and alleviate psychiatric symptoms as well as ameliorate other clinical *** r,therapeutics targeting the dopaminergic system are associated with various adverse reactions,such as addiction and exacerbation of cognitive *** review summarizes the role of the dopaminergic system in the pathology of Alzheimer's disease,focusing on currently available dopamine-based therapies for this disorder and the common side effects associated with dopamine-related *** aim of this review is to provide insights into the potential connections between the dopaminergic system and Alzheimer's disease,thus helping to clarify the mechanisms underlying the condition and exploring more effective therapeutic options.

关键词： adverse drug reaction Alzheimer's disease catecholamine dopamine receptor dopamine receptor heterodimers dopaminergic system neurodegenerative disease neurotransmitter signaling pathways traditional Chinese medicine treatment

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