排序方式： 共有15条查询结果，搜索用时 15 毫秒
1.
Rock slope instabilities are a major hazard for human activities often causing economic losses, property damages and maintenance costs, as well as injuries or fatalities. For slope stability analysis of open pit mines, series of studies must be carried out in order to identify the criteria which should take into consideration. In this research geotechnical parameters; Geological Strength Index (GSI), Rock Quality Designation (RQD), Cohesion (C), angle of internal friction (φ), uniaxial compressive strength (UCS) and Rock mass deformation modulus (Em) which are obtained from data measured within geotechnical boreholes and pore pressure (U) are considered as the criteria to evaluate stability of pit No.1 of the Gole Gohar iron mine, located in Kerman province, south east of Iran. Since human judgments and preferences are often vague and complex and decision makers cannot estimate their preferences with an exact scale, we can only give linguistic assessments instead of exact ones. So fuzzy set theory introduced into Analytical Hierarchy Process (AHP). Fuzzy AHP (FAHP) is put forward to solve such uncertain problems. In this paper, FAHP method is used to determine the weights of the criteria by decision makers and then classification of the stability of blocks are determined by TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) method by the shortest distance to positive ideal solution (PIS) and the longest distance to negative ideal solution (NIS). 相似文献
2.
With the availability of very high resolution multispectral imagery, it is possible to identify small features in urban environment. Because of the multiscale feature and diverse composition of land cover types found within the urban environment, the production of accurate urban land cover maps from high resolution satellite imagery is a difficult task. This paper demonstrates the potential of 8 bands capability of World View 2 satellite for better automated feature extraction and discrimination studies. Multiresolution segmentation and object based classification techniques were then applied for discrimination of urban and vegetation features in a part of Dehradun, Uttarakhand, India. The study demonstrates that scale, colour, shape, compactness and smoothness have a significant influence on the quality of image objects achieved, which in turn governs the classified result. The object oriented analysis is a valid approach for analyzing high spatial and spectral resolution images. World View 2 imagery with its rich spatial and spectral information content has very high potential for discrimination of the less varied varieties of vegetation. 相似文献
3.
4.
Minakshi P.K. Sharma Amandeep Kaur Vanita Shalley 《Journal of the Indian Society of Remote Sensing》2005,33(1):63-68
This study reveals the temporal changes in the land use/land cover of district Ludhiana from the years 1970 to 2001 and reports
on the change that has occurred in land use/land cover as a result of change in cropping pattern. The changes were analysed
through the data obtained from statistical abstract 1969–70, False Colour Composite (FCC) of IRS-IC LISS-III satellite data
of March 2001 and ground truth. There has been a decrease in agricultural land by 2100 ha. but still it occupies 83.76% of
the total geographical area (TGA). The wasteland shows a declining trend whereas forest cover has increased from 1.07 to 2.71%
of TGA. Area under non-agricultural uses has increased from 10.13 to 12.50% of TGA. There has also been a great change in
the cropping pattern of the district. Crops such as groundnut, gram and cotton have nearly disappeared and wheat and rice
dominate the region. This change has substantially resulted in the decrease of area under wastelands. 相似文献
5.
M. N. Patil Manoj Kumar R. T. Waghmare T. Dharmaraj N. C. Mahanty 《Theoretical and Applied Climatology》2014,118(1-2):47-56
The micrometeorological observations, collected over a station in Ranchi (23°45′N, 85°30′E) which is under the monsoon trough region of India, were used in the Noah-LSM (NCEP, OSU, Air Force and Office of Hydrology Land Surface Model) to investigate the model performance in wet (2009 and 2011) and dry (2010) conditions during the south-west summer monsoon season. With this analysis, it is seen that the Noah-LSM has simulated the diurnal cycle of heat fluxes (sensible and ground) reasonably. The simulated heat fluxes were compared with its direct measurements by sonic anemometer and soil heat flux plate. The net radiation and sensible heat flux are simulated well by the model, but the simulation of ground heat flux was found to be poor in both dry as well as wet conditions. The soil temperature simulations were also found to be poor in 0–5- and 5–10-cm layers compared to other deeper layers. The observations were also correlated with the Modern Era Retrospective-analysis for Research and Applications (MERRA) data. The correlation between the observations and ground heat flux was better in MERRA dataset than that of the Noah-LSM simulation. 相似文献
6.
M N Patil R T Waghmare T Dharmaraj G R Chinthalu Devendraa Siingh G S Meena 《Journal of Earth System Science》2016,125(7):1399-1411
Surface to atmosphere exchange has received much attention in numerical weather prediction models. This exchange is defined by turbulent parameters such as frictional velocity, drag coefficient and heat fluxes, which have to be derived experimentally from high-frequency observations. High-frequency measurements of wind speed, air temperature and water vapour mixing ratio (eddy covariance measurements), were made during the Integrated Ground Observation Campaign (IGOC) of Cloud Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX) at Mahabubnagar, India (16°44′N, 77°59′E) in the south-west monsoon season. Using these observations, an attempt was made to investigate the behaviour of the turbulent parameters, mentioned above, with respect to wind speed. We found that the surface layer stability derived from the Monin–Obukhov length scale, is well depicted by the magnitude of wind speed, i.e., the atmospheric boundary layer was under unstable regime for wind speeds >4 m s?1; under stable regime for wind speeds <2 m s?1 and under neutral regime for wind speeds in the range of 2–3 m s?1. All the three stability regimes were mixed for wind speeds 3–4 m s?1. The drag coefficient shows scatter variation with wind speed in stable as well as unstable conditions. 相似文献
7.
Mahadevappa Naganathappa Shivaji Waghmare Ajay Chaudhari 《Astrophysics and Space Science》2011,332(2):249-256
This work reports theoretical infrared and electronic absorption spectra of formaldehyde and its ions in gas phase and H2O ice at different levels of theory. The vibrational frequencies from this work at B3LYP/6-311++G** level are in agreement with the experimental determinations. The gas phase dipole moment of neutral formaldehyde 2.4 D is
in excellent agreement with the experimental value of 2.33 D. An influence of ice on vibrational frequencies of neutral formaldehyde
molecule was obtained using Self Consistence Isodensity Polarizable Continuum Model (SCI-PCM) with dielectric constant 78.5.
Significant shift in vibrational frequencies for neutral formaldehyde molecule when studied in H2O ice and upon ionization is observed. All the vibrational modes in cation and anion of formaldehyde in gas phase are red
shifted than the corresponding modes in neutral formaldehyde. Two vibrational modes are blue shifted and all other modes are
red shifted for neutral formaldehyde in H2O ice. Time dependent density functional theory (TDDFT) is used to study electronic absorption spectrum of neutral formaldehyde
and its charged states. It is found that like neutral formaldehyde, its cation and anion also display strong σ→σ
∗ electronic transitions in vacuum and far UV regions. This study should help in detecting formaldehyde molecule and its ions
in gas phase and in H2O ice in different astronomical environment. 相似文献
8.
This paper presents the results of a magnetometer array study covering Kangra region to supplement information already available
on the nature of geoelectrical structure at the foothills of Himachal Pradesh-Kumaun-Himalaya. The observed induction pattern
across the Himalayan frontal fault is found to be the expression of a psuedo-geomagnetic coast effect associated with the
edge of sheet current flowing in the sediments of the IndoGangetic Plains. An additional conductive sheet that is required
beneath the frontal folded belt may represent increased hydration of certain sedimentary layers. 相似文献
9.
The method of rectangular harmonic analysis is applied to the geomagnetic field data from central India to isolate long wavelength
magnetic anomalies associated with largescale crustal structures. The long-wavelength anomalies have accounted for approximately
20 % of the spatial variability of the residual magnetic field over the International Geomagnetic Reference Field. On the
magnetic anomaly map, reflecting the surface expression of longwavelength anomalies, the Tapi-Narmada-Son zone is characterized
by a feeble positive anomaly bounded by a strong negative anomaly. The anomaly pattern is believed to be caused by the large-scale
undulation in Moho and related variations in the thickness of the lower (basaltic) crust. The other two prominent anomalies,
the magnetic low striking northwest and the magnetic high trending east-northeast, appear to be related to the deep structural
feature of the Godavari graben and the eastern Rajasthan lineament respectively. 相似文献
10.
Natural Hazards - The Andaman–Nicobar–Sumatra (ANS) region is a very hazardous area on the globe, which has witnessed a megathrust earthquake of Mw 9.2 on 26 December 2004 and several... 相似文献