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Quantifying glacier surging and associated lake dynamics in Amu Darya river basin using UAV and remote sensing data

Journal of Mountain Science 2024年第9期21卷 2967-2985页

作者： safarov mustafo KANG Shichang MURODOV Murodkhudzha BANERJEE Abhishek NAVRUZSHOEV Hofiz GULAYOZOV Majid FAZYLOV Ali VOSIDOV Firdavs Key Laboratory of Cryospheric Science and Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Research Center for Ecology and Environment of Central Asia(Dushanbe) Dushanbe 734063Tajikistan University of Chinese Academy of Sciences Beijing 100049China Xinjiang Institute of Ecology and Geography Chinese Academy of SciencesUrumqi 830011China Mountain Societies Research Institute University of Central AsiaDushanbe 734000Tajikistan State Scientific Institution“Center for Research of Glaciers of the National Academy of Sciences of Tajikistan” Dushanbe 734025Tajikistan Institute of Water Problems Hydropower and Ecology of the National Academy of Sciences of TajikistanDushanbe 734025Tajikistan

Glaciers in the Pamir region are experiencing rapid melting and receding due to climate change,which has a significant implication for the Amu Darya river ***,surging glaciers,which undergo unpredictable advances,are potentially leading to the obstruction of high-altitude river channels and also glacial lake outburst *** of-703.5±30.0 *** is a substantial increase in the number(from 19 to 75)and area(from 4889.7±0.6 m2 to 15345.5±0.6 m2)of RGS lakes along with supra-glacier ponds based on a comparison of ArcGIS base map in 2011 and high-resolution UAV data in *** M glacier,number of lakes increased from 4 to 22 but the lake area declined from 10715.2±0.6 to 365.6±0.6 *** was noted that the largest lake in 2011 with an area of 10406.4±0.6 m2 at the southeastern portion of the glacier was not observed in 2023 due to *** the glaciers have substantially impacted the river flow(Abdukahor river)by obstructing a significant proportion of river channel in recent years and might cause outburst *** findings enhance the understanding of glacier dynamics and their impacts on the surrounding areas,emphasizing the urgent need for continued monitoring and appropriate management strategies,with a specific focus on surging glaciers and the associated risks.

关键词： UAV Remote sensing Climate change Glacier dynamics Google Earth Engine Pamir

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塔吉克斯坦典型草地无人机地上生物量产品

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中国科学数据（中英文网络版） 2024年第3期9卷 64-74页

作者：潘天力叶虎平张心昱任小丽廖小罕巴音达来 safarov mustafo Okhonniyozov Mekhrovar 中国科学院地理科学与资源研究所北京100101 香港科技大学工程学院中国香港999077 中国民航局民航低空地理信息与航路重点实验室北京100101 中国科学院新疆生态与地理研究所乌鲁木齐830011 中国科学院中亚生态与环境研究中心乌鲁木齐830011 中亚生态与环境研究中心(杜尚别) 杜尚别734024 中国科学院西北生态环境资源研究院兰州730000

中亚地区拥有全世界最大的连片草原,塔吉克斯坦作为中亚五国的典型代表,其地表的草地植被状况具有重要研究意义。本研究针对塔吉克斯坦的5个草地典型站点于2022年开展了无人机草地资源调查,数据采样过程严格遵照标准规范进行,基于固定... 详细信息

中亚地区拥有全世界最大的连片草原,塔吉克斯坦作为中亚五国的典型代表,其地表的草地植被状况具有重要研究意义。本研究针对塔吉克斯坦的5个草地典型站点于2022年开展了无人机草地资源调查,数据采样过程严格遵照标准规范进行,基于固定翼无人机于晴朗天气下搭载光学相机同时采集了多光谱与RGB图像,在航拍结束后通过在地面布设样方刈割植被后处理得到地上生物量数据。使用地面实测生物量数据与无人机多光谱以及RGB信息以广义加性模型建立关系,利用交叉验证对模型数据质量进行控制,实现高精度生物量建模,并将生物量点采样扩展到面尺度上,得到生物量产品分辨率为1 m。本数据集可用于中亚典型草原小区域植被生物量的分析和卫星遥感植被产品的多尺度对比校正,有效弥补了地面观测与常规遥感监测的尺度匹配问题。

关键词：无人机地上生物量多光谱 RGB 塔吉克斯坦

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Induced radioactivity at particle accelerators:a short review

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Radiation Detection Technology and Methods 2021年第4期5卷 481-492页

作者： Shakhboz Khasanov Bo Yang Youwu Su Akmal safarov Yao Yang Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Samarkand State University SamarkandUzbekistan140104 Institute of Advanced Science Facilities Shenzhen 518107China

Purpose The induced radioactivity in accelerator components and decay characteristics of radioactive nuclei contained therein is critical for radiation safety of occupational workers as well as for the maintenance,repair,and decommissioning *** topic of induced radioactivity is widely reported and extensively explored in the literature by many researchers up to *** mini-review would demonstrate the current state of the knowledge on induced radioactivity at particle *** In this article,the concepts of activation-related studies and radionuclide generation in accelerator environments are *** addition,some studies on accelerator-induced radioactivity by Monte Carlo and experimental measurement methods are briefly *** and conclusions The possible radiation protection problems caused by particle accelerator-induced radioactivity are briefly reviewed and *** produced radionuclides depend on the beam parameters such as particle type,energy,irradiation period,cooling time,and irradiated *** Monte Carlo simulation method offers comparable advantages over empirical analysis method.A review of major studies in the field of induced radioactivity of particle accelerators confirmed that the extremely strong induced radioactivity generated at hot spots of accelerators means new challenges to radiation safety and deserves further investigation and discussion.

关键词： Accelerators Radioactivity Monte Carlo Radiation protection

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Natural Oscillations of Viscoelastic Lamellar Mechanical Systems with Point Communications

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Applied Mathematics 2014年第19期5卷 3018-3025页

作者： safarov Ismail Ibrahimovich Teshaev Muhsin Hudoyberdievich Madjidov Maqsud Bukhara Engineering-Technological Institute Bukhara Republic of Uzbekistan

We investigated the natural oscillations of dissipative inhomogeneous plate mechanical systems with point connections. Based on the principle of virtual displacements, we equate to zero the sum of all active work force, including the force of inertia which obtain equations vibrations of mechanical systems. Frequency equation is solved numerically by the method of Muller. According to the result of numerical analysis we established nonmonotonic dependence damping coefficients of the system parameters.

关键词： Plate Viscoelastic Properties Natural Frequencies Damping Ratios Structurally Homogeneous and Structurally Heterogeneous

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乌兹别克斯坦撒马尔罕古城雷吉斯坦广场的建筑遗产保护

乌兹别克斯坦撒马尔罕古城雷吉斯坦广场的建筑遗产保护

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作者： ANVAR safarov NORMATOVICH（安华）东南大学

学位级别：硕士

Samarkand is a city in modern-day Uzbekistan and is one of the oldest inhabited cities in Central *** is evidence of human activity in the area of the city from the late Paleolithic era,though there is no direct evidence of when exactly Samarkand proper was founded;some theories are that it was founded between the 8th and 7th centuries *** from its location on the Silk Road between China and the Mediterranean,at times Samarkand was one of the greatest cities of Central *** city is noted for being an Islamic Centre for scholarly *** the 14 th century it became the capital of the empire of Timur(Tamerlane)and is the site of his mausoleum(the Gur-e Amir).The Bibi-Khanym Mosque(a modern replica)remains one of the city's most notable *** Registan was the ancient center of the *** city has carefully preserved the traditions of ancient crafts: embroidery,gold embroidery,silk weaving,engraving on copper,ceramics,carving and painting on *** major monuments include the Registan mosque and madrasahs,originally built in mud brick and covered with decorated ceramic tiles,the Bibi-Khanum Mosque and Mausoleum,the Shakhi-Zinda compound which contains a series of mosques,madrasahs and mausoleum,and the ensembles of Gur-Emir and Rukhabad,as well as the remains of Ulugh-Bek's *** Registan Square is a real gem located in the very heart of the ancient city of *** has gained its worldwide fame thanks to the great architectural ensemble that has become a monument of the oriental *** three sides,the square is surrounded with grand madrassah,portals of which are facing the center of the *** three erections have their own unique dé*** is by virtue of these buildings,preserved on the territory of the city,Samarkand was included in the UNESCO World Heritage List in *** aim of this research work is to assess and discuss the strategies employed or adopted in Architectural heritage conservation of buil

关键词： Architectural Heritage Conservation Preservation Heritage Buildings Registan Square Samarkand

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Dynamics of Structural-Inhomogeneous Laminate and Shell Mechanical Systems with Point Constraints and Focused Masses. Part 2. Statement of the Problem of Forced Oscillations, Methods of Solution, Computational Algorithm and Numerical Results

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Journal of Applied Mathematics and Physics 2019年第11期7卷 2671-2684页

作者： Mirsaidov Mirziyod safarov Ismoil Ibrokhimovich Teshaev Mukhsin Khudoyberdievich Tashkent Institute of Irrigation and Agricultural Mechanization Engineers TashkentUzbekistan Tashkent Chemical Engineering Institute TashkentUzbekistan Bukhara Engineering and Technology Institute BukharaUzbekistan

A vibrational formulation, a technique, and an algorithm are proposed for assessing the resonance state of a package of rectangular plates and shells having point bonds and concentrated masses with different rheological properties of deformable elements under the influence of harmonic influences. The viscoelastic properties of elements are described using the linear Boltzmann-Volterra theory. An algebraic system of equations with complex coefficients is obtained, which is solved by the Gauss method. Various problems on steady-state forced vibrations for structurally inhomogeneous mechanical systems consisting of a package of plate and shell systems with concentrated masses and shock absorbers installed in it were solved. A number of new mechanical effects have been discovered associated with a decrease in the maximum resonance amplitudes of the mechanical system as a whole. The concept of “global resonance amplitude” is introduced to study the behavior of the resonance amplitudes of a mechanical system. An analysis of the numerical results showed that the interaction of resonant amplitudes is observed only in structurally inhomogeneous systems (in this case, with elastic and viscoelastic elements) and with a noticeable approximation of the natural frequencies.

关键词： Viscoelastic Shell Plate Point Bonds Vibrational Equation Global Resonance Amplitude Concentrated Mass Shock Absorber

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Setting the Linear Oscillations of Structural Heterogeneity Viscoelastic Lamellar Systems with Point Relations

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Applied Mathematics 2015年第2期6卷 228-234页

作者： Ismail Ibrahimovich safarov Maqsud Sharipovich Akhmedov Zafar Ihterovich Boltaev Bukhara Technological-Institute of Engineering Bukhara Republic of Uzbekistan

The paper solves the problem of the variation formulation of the steady-linear oscillations of structurally inhomogeneous viscoelastic plate system with point connections. Under the influence of surface forces, range of motion and effort varies harmonically. The problem is reduced to solving a system of algebraic equations with complex parameters. The system of inhomogeneous linear equations is solved by the Gauss method with the release of the main elements in columns and rows of the matrix. For some specific problems, the amplitude-frequency characteristics are obtained.

关键词： Plates The Ability to Move The Complex Amplitude

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Dynamics of Structurally Inhomogeneous Lamellar and Shell Mechanical Systems. Part 1

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Journal of Applied Mathematics and Physics 2019年第10期7卷 2283-2302页

作者： Mirsaidov Mirziyod Mirsaidovich safarov Ismoil Ibrokhimovich Teshaev Mukhsin Khudoyberdievich Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Tashkent Uzbekistan Tashkent Chemical and Technological Institute Tashkent Uzbekistan Bukhara Engineering and Technological Institute Bukhara Uzbekistan

A vibrational statement, method and algorithm to assess the damping capacity of structurally inhomogeneous viscoelastic mechanical systems, consisting of a package of rectangular plates and shells with point relations and concentrated masses at different rheological properties of deformable elements, are proposed in the paper. To describe rheological properties of the material, the linear hereditary Boltzmann-Volter theory was used. To assess the damping capacity of the system, the problem in question in each case was reduced to solving the proper problems of algebraic equations with complex parameters solved by the Muller method. The accuracy of the methods was demonstrated by comparing the calculated results with known published data and a numerical experiment. Complex natural frequency of the system was used to assess the damping capacity of inhomogeneous viscoelastic systems. Various eigenvalue problems have been solved for structurally inhomogeneous mechanical systems consisting of a package of plate and shell systems with concentrated masses and shock absorbers. A number of new mechanical effects have been discovered, related to the manifestation of the damping capacity of mechanical systems under consideration.

关键词： Inhomogeneous System Viscoelasticity Complex Natural Frequency Global Damping Coefficient Package of Plates Concentrated Mass Shock Absorber

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Natural Oscillations of Cylindrical Bodies with External Friction on the Boundary

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Applied Mathematics 2015年第3期6卷 629-625页

作者： safarov Ismail Ibrahimovich Akhmedov Maqsud Sharipovich Boltaev Zafar Ihterovich Bukhara Engineering-Technological Institute Bukhara Republic of Uzbekistan

In this paper we consider of natural oscillations cylindrical bodies with external friction. Complex rates changes from friction parameters are shown. Rate equations are solved numerically—by method of Muller.

关键词： External Friction The Natural Oscillations Cylindrical Body Flat Swing Ant Plane Oscillation Frequency Damping Factor

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Loose Waves in Viscoelastic Cylindrical Wave Guide with Radial Crack

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Applied Mathematics 2014年第21期5卷 3518-3524页

作者： Ismail Ibragimovich safarov Maqsud Sharipovich Akhmedov Zafar Ihterovich Boltaev Bukhara Technological-Institute of Engineering Bukhara Republic of Uzbekistan

The main features are the length of the waveguide in one direction, as well as limitations and localization of the wave beam in other areas. There is described the technique of the solution of tasks on distribution of waves in an infinite cylindrical waveguide with a radial crack. Also numerical results are given in the article. Viscous properties of the material are taken into account by means of an integral operator Voltaire. Research is conducted in the framework of the spatial theory of visco elastic. The technique is based on the separation of spatial variables and formulates the boundary eigenvalue problem that can be solved by the method of orthogonal sweep Godunov. In the given paper we obtain numeric values of the phase velocity depending on of wave numbers. The obtained numerical results are compared with the known data. This work is continuation of article [1]. Statement of the problem and methodology of partial solutions are described in [1]. In this work, we present a complete statement of the problem, methods of solution and discuss the numerical results.

关键词： The Wave Guide Wave Cylinder Crack Integral Operator Differential Equations Relaxation Kernel Orthogonal Sweep Approximation Partial Derivatives The Phase Velocity Frequency Damping Factor

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