Tìm kiếm tài liệu miễn phí

Địa Lý (3.048)

Nghiên cứu xây dựng hệ thống phân loại và thành lập bản đồ cảnh quan lãnh thổ tỉnh Sơn La

Tỉnh Sơn La có điều kiện tự nhiên đa dạng, các hợp phần tự nhiên và cảnh quan (CQ) mang đặc thù của miền núi, là hệ quả của mối tương tác phức tạp giữa các hợp phần và nhân tố thành tạo cảnh quan. Trên quan điểm tiếp cận lãnh thổ, hệ thống và tổng hợp, bằng phương pháp phân tích nhân tố trội, so sánh theo đặc điểm riêng biệt của các chỉ tiêu chuẩn đoán từng cấp phân vị, phân tích tổng hợp và liên hợp các bản đồ hợp phần để xác định các đơn vị cảnh quan và thể hiện các khoanh vi cụ thể trên bản đồ.

Ứng dụng WebGIS xây dựng bản đồ chỉ dẫn địa lý vải Thanh Hà

Nghiên cứu sử dụng công nghệ Google Maps API để xây dựng bản đồ trực tuyến mô tả khu vực chỉ dẫn địa lý vải Thanh Hà. Kết quả nghiên cứu cho thấy, ứng dụng Google Maps API để xây dựng WebGIS đơn giản, không cần cài đặt phần mềm. Công cụ này rất phù hợp trong việc xây dựng các hệ thống bản đồ chuyên đề trên mạng Internet.

Biện pháp phát triển năng lực dạy học tích hợp cho sinh viên ngành Sư phạm địa lí trường Đại học Tây Bắc

Bài viết đề xuất một số biện pháp nhằm phát triển năng lực dạy học tích hợp cho sinh viên, cụ thể như: Xây dựng và sử dụng tài liệu tự học về Dạy học tích hợp cho sinh viên, đề xuất bổ sung nội dung về Dạy học tích hợp cho sinh viên sư phạm trong học phần Rèn luyện kĩ năng thiết kế bài giảng Địa lí, hướng dẫn SV xây dựng và lập kế hoạch dạy học chủ đề tích hợp

Nghiên cứu tai biến địa chất trên tuyến đường Hồ Chí Minh từ Quảng Trị đến Quảng Nam bằng phương pháp phân tích ảnh viễn thám, thu thập tài liệu và lộ trình khảo sát

Sử dụng phương pháp phân tích ảnh viễn thám kết hợp với thu thập tài liệu và khảo sát thực địa vào đánh giá hiện trạng tai biến, lũ quét - lũ bùn đá dọc tuyến đường HCM từ Quảng Trị đến Kon Tum, đã cho thấy: Trên tuyến đường HCM qua Quảng Trị dài 162km đã phát sinh 15 khối trượt và 1 điểm lũ quét - lũ bùn đá với khối lượng đất đá 6.777m3, chiếm 9,3%; đoạn qua tỉnh TT.

Fragility curves for vulnerability assessment of steel moment resisting frames adjacent to slopes

The results indicated that slope effect leads to up to 37% increase in the damage probability and illustrated that amplification factor had a range of 1.1 to 1.35, moreover, in comparison with slight states, the probability damage growth rate in moderate and extensive states are higher.

Dependence of ductility response spectra on the seismogenic depth from finite element earthquake rupture simulations

Ongoing research in the development of design philosophies for earthquake resistant structures over the past few decades was initially based on the strength and elastic analysis. Later, design philosophies recognized the deformation to be an important parameter to be considered in design following nonlinear analysis. The maximum design lateral force, for a particular earthquake, acting on structures having multiple natural time periods can be obtained from inelastic response spectrum.

Estimation of the frequency dependent shear wave attenuation from acceleration spectra of the Ahar - Varzeghan earthquake 2012

The data from a local network of 21 and 19 acceleration recordsfor the first and second main shocks have been used to estimate Q-relationship in 30 stations. The seismic hazard map for this region illustrates that most of the area in this province is located within high relative risk and characterized by a large number of heterogeneities.

Empirical relationships based on the P-wave envelop for distance and magnitude estimation for earthquake early warning in Iran

The main goal of an Earthquake Early Warning (EEW) system is to reduce the damaging effects of the hazardous earthquakes. The characterization of an earthquake for EEWincludes most importantly, the estimates of itssize (magnitude) and location. In this study, the distance and magnitude of the selected earthquakes were estimated using the envelope ofthe initial part of the P-waveforms deploying a single seismic record.

Evaluation of earthquake potential in the zagros region (Iran) using seismic strain and seismicityparameters

Medium to large b-values (0.74, 0.75, 0.76, 0.79 and 1.01) are accompanied with small to large strain rates (1.42×10 -9 , 2.09×10 -9 , 2.19×10 -9 , 4.15×10 -9 and 1.24×10 -8 ) in northwestern parts of Zagros indicating less frequent moderate to large earthquakes. Recurrence intervals of large earthquakes (M>6) in southeastern parts of Zagros (17, 43 and 48 years) and central parts of Zagros (24, 27 and 59 years) are shorter than northwestern parts (27, 51, 79 and 130 years).

Optimum seismic design of tuned story mass damper using multi objective genetic algorithm

The results showthat considering the TSMD systemon the fifth floor leads to the most reduction in displacement and velocity, not only for the roof, but also for the other floors as well. For the system under study, comparing with the noncontrolled system, a reduction of about 31% on maximumdisplacement and 42% on maximum velocity of the top floor are obtained.

Source parameterization of finite faults in earthquake ground motion simulation

In this regard, the fault surface is discretized using different elements, namely, constant discontinuous elements with various sizes, and first order contentious elements with different sizes. In order of parameterization, a bilinear interpolation technique is introduced to represent variation of source parameters within the subfault area.

Performance assessment of steel isolated structures considering heating in lead core based on seismic risk

This paper presents a methodology to utilize performance-based seismic design procedure for evaluating the effect of heating in lead core of isolated structures with lead-rubber bearing based on collapse assessment and seismic loss estimation. Nonlinear archetypes of conventional 4-story steel special moment resisting frame, isolated intermediate moment resisting frame with and without heating in lead core effect are compared with each other under far-field (FF) and near-field earthquakes.

Analytical study of interior rigid bents arrangement on seismic response of tall buildings

In this research, the performance abilities associated with tube type lateral load resistant framed systems are studied in order to assess the seismic response parameters ofsteel tall buildings under both far and near-field records. For this purpose, four 30 story structural models with separated framed tube-based skeletons were selected and designed.

Grid based probabilistic earthquake forecast for Iran

In this paper, a model of earthquake forecast is presented to assess the long-term probabilities of future earthquakes with moderate magnitudes for a region including Iran (latitude 25-40° and longitude 44-62°). The model estimates a coupled rate of magnitude, space and time for future seismicity using a spatial-temporal Poisson process.

The effects of soil structure interaction on seismic response of steel moment resisting frames

In this study, the seismic behavior of steel structures with various heights under the SSI effect have been studied. For this purpose, three steel structures including 9, 15 and 20 story frames were modeled using Opensees.

Seismic assessment of trapezoidal shaped hills induced bystrong ground motion records

This study aims to rigorously examine the influences of the vertically propagating recorded strong ground motions on the trapezoidal-shaped hills in different sizes and shape ratios. In order to generalize the results of the study, one-dimensional as well as two-dimensional analyses are conducted. Then, intended results are represented in dimensionless form as a result of which amplification ratio patterns are extracted and compared with each other in terms of displacement, velocity, and acceleration.

Performance of RC structures and associated lessons to be learned from November 12, 2017, sarpol-e zahab-ezgeleh earthquake (MW 7.3)

Considerable number of damaged buildings that are constructed in recent years, is probably because of the lack of enough supervision by IRCEO and other responsible organizations. In this paper, observed damages to RC structures were examined and explained in detail.

Performance of steel structures and associated lessons to be learned from November 12, 2017, sarpol-eZahab-ezgeleh Earthquake(MW 7.3)

Post-earthquake observations showed that damages in steel structures were mostly due to poor construction quality including lack of proper welding in connections, extent of irregularities of the structural system, false structural design, local site effects, and finally lack of enough supervision by "Iran Construction Engineering Organization" (IRCEO) and other responsible organizations. In this paper, observed damages to steel structures were examined and explaneed in detail.

The main reasons for great damages of reinforced concrete buildings on 12th november 2017, sarpol e-zahab earthquake

Thisinvestigation is based on the observations of IIEES reconnaissance team. The main objective of this research is to evaluate the seismic performance of reinforced concrete multistory buildings during the Sarpol-e Zahab earthquake and vulnerability assessments of important multistory reinforced concrete structures such as Mehr buildings of Sarpol-e Zahab, Eslamabad-e Gharb, and Imam Khomeini hospital in Eslamabad-e Gharb, Kermanshah Province.

Smart fog computing for efficient situations management in smart health environments

This paper aims to provide a new generic user situation-aware profile ontology (GUSP-Onto) for a semantic description of heterogeneous users’ profiles with efficient patients’ situation management and health multimedia information dissemination related to smart health services.

Spatial and temporal stress changes in the aftershock sequence following the Nov. 12, 2017 sarpol-e zahab earthquake

In addition, the spatial stress variations were studied implementing the stresstensor inversion in different clusters of events. These results suggest that the 2017 mainshock ruptures caused both spatial and temporal stress perturbations that continued in time showing a specific character, which was not observed before in the Zagros region.

Determination of structural fragility curves of various building types for seismic vulnerability assessment in the sarpol e-zahab city

In order to find out which level ofthe seismic design can be used in defining the fragility curves, different weights were considered to apply to the HAZUS fragility curves of high, moderate, low and pre-code to be used in the logic tree method. Finally, the mean and standard deviation values were introduced for the construction of fragility curves with the lognormal distribution for the seven Iranian building types.

Sarpol e-zahab earthquake damages to roadway bridges

This study indicates that concrete superstructures were more vulnerable than superstructures with steel girder. It also indicates that bridges with masonry abutments were more vulnerable than those with concrete abutments. Compared to single span bridges, the state of damage in multi-span bridges were more severe.

Rapid estimating epicentral distance and magnitude from a single seismic record of sarpol e-zahab earthquake

The greatest advantage of this method is its accuracy and rapidness. The EEW system issues several alarm messages during the course of one earthquake, improving the accuracy of the warning as the amount of available data increases. The EEWis transmitted to many kinds of devices and used for personal safety and automatic control. It is very important to observe strong motion in real-time using a dense network in order to improve the EEWsystem.

Role of transferred static stress due to sarpol e zahab earthquake in aftershock distribution

There is a good correlation between Coulomb stress changes and aftershocks distribution in Sarpol-e Zahab event. Furthermore, calculated static stress on the surrounding faults showed that middle part of the High Zagros Fault (HZF), the northern part of the Main Recent Fault (MRF), and the northern part of the Zagros Foredeep Fault (ZFF) are located in the positive stress change area.

Evaluation of a seismic collapse assessment methodology based on the collapsed steel buildings data in sarpol e-zahab, iran earthquake

In this paper, an attempt is made to examine the efficiency of an approximate incremental dynamic analysis (IDA) method to estimate the collapse capacity of conventional steel structures. To this purpose, two partially collapsed steel structures are selected. Both two structures are comprised of an ordinarymoment resisting frame systemin one direction, and a braced frame system in other perpendicular direction.

Verification of a proposed assessment method applied to concrete buildings collapsed during sarpol e-zahab, Iran earthquake

This building had much better performance than two others and experienced less loss. Moreover, the results of the analysis show that the collapse criteria related to the seismic evaluation codes are non-conservative. The results of this survey imply that the proposed method can precisely forecast the collapse or non-collapse of the studied buildings. Therefore, it would be recognized as a reliable method for collapse assessment.

Performance of masonry buildings in november 12, 2017, sarpol e-zahab - ezgeleh earthquake (MW 7.3)

Post-earthquake observations showed that the use of URM buildings in the area with high relative hazard of seismicity lead to significant damages. Moreover, defects in design and construction of buildings, which was the result of the lack of enough supervision by responsible organizations, can be considered as other causes of damages. In this paper, observed damages in masonry buildings are presented and investigated in detail.

Strong motion records in sarpol e-zahab earthquake

In thisstudy, seismological aspects ofthe 2017 Sarpol-e Zahab earthquake has been investigated. The Sarpol-e Zahab earthquake, of magnitude 7.3 (Mw), occurred in southwestern Iran on November 12, 2017. Here, we investigated the properties of the strong ground motions of the earthquake using the records provided by Iranian Strong Motion Network (ISMN).

Traffic flow prediction model based on neighbouring roads using neural network and multiple regression

This paper discusses the results of experiments we have conducted to determine relationship between roads in a neighbouring area and to determine input factors for our neural network traffic flow prediction model. To choose a particular road as a predicting factor, we calculated the distance between roads in neighbouring area to identify the nearest road.

Tài liệu mới download

Từ khóa được quan tâm


Có thể bạn quan tâm

Chương 2 - Tham chiếu địa lý
  • 20/02/2013
  • 87.913
  • 679
Tìm hiểu Thiên văn hàng hải
  • 08/08/2011
  • 16.641
  • 263

Bộ sưu tập

Danh mục tài liệu