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71.
M.S. Hamza 《Geochimica et cosmochimica acta》1974,38(5):669-681
The surface effect on the isotopic fractionation between CO2 and calcite, dolomite and witherite has been studied through gas-solid exchange experiments. Oxygen isotope fractionation between surface calcite and CO2 was found to be higher by 5–6%. than the fractionation between bulk calcite and CO2.Similar studies were made using dolomite and witherite. The dolomite-calcite and witheritecalcite fractionation evaluated through the surface exchange with CO2 were found to be close to values determined by other workers under controlled conditions in the laboratory. 相似文献
72.
The paper is devoted to the study of uncertainties when studying buildings under seismic loading. These uncertainties are
related to the simplifications used when constructing the model (model uncertainties) and to the numerical data needed at
the computation stage (data uncertainties). It has been shown in previous papers that nonparametric models are able, in the
case of linear dynamics, to deal simultaneously with these two kinds of uncertainties. The paper presents an extension of
this kind of model by taking into account a “mixed” approach for concrete frame structures, which uses a nonparametric model
for the part of the structure which behaves linearly and a parametric approach for the parts of the structure (plastic hinges)
which behave non-linearly. A numerical application is presented in the case of a residential building. 相似文献
73.
V. M. Hamza R. R. Cardoso C. F. Ponte Neto 《International Journal of Earth Sciences》2008,97(2):233-239
Pollack and Chapman, hereafter referred to as P&C, argue that: (1) errors arising from lack of quality control in the IHFC
database are not important and not properly documented, (2) resolution of spatial patterns in global heat flux distribution
should not be represented by spherical harmonics and (3) heat flow in young oceanic crust and global heat loss are better
represented by a contested 1-D cooling model than by the data. We disagree and provide additional information that may help
clear up such misunderstandings. We also mention briefly the results of a new improved thermal model of the lithosphere that
satisfactorily reproduces the main features identified in observational data sets of heat flow and ocean floor bathymetry.
Thus, there is no reason to invoke the ad hoc hypothesis of large-scale hydrothermal circulation in the ocean crust. 相似文献
74.
75.
R. K. Verma R. U. M. Rao M. L. Gupta G. Venkateshwar Rao V. M. Hamza 《Bulletin of Volcanology》1969,33(1):69-88
Results of heat flow studies made in different parts of India including Kolar Gold Field, Cuddapah basin, Singhbhum thrust zone, Aravalli mountain system of Precambrian age, Godavary valley of Mesozoic age and Cambay basin of Cenozoic age are discussed. Heat flow has been found to be low in the southern part of the Preambrian shield. Relatively higher values have been obtained along the northeastern (Singhbhum) and the northwestern parts of the shield (Aravallies). High heat flow has been found along the southeastern part of the Godavary valley and the Cambay basin. The correlation of heat flow with geology and tectonic history in the respective areas is discussed. 相似文献
76.
The relationship of heat flow to age of the basement rocks has been studied for USA and Canada, Australia and India. In areas of sedimentary basins the ages of the cores obtained from the metamorphic or igneous basement were used for such correlation. It is found that heat flow values for all continents studied show a definite correlation with age the relatively high heat flow being associated with younger basements. Such correlation when fully established will enable us to correlate heat flow values with geology and ages of tectonic events which have occurred in the earth’s crust. 相似文献
77.
Climate Dynamics - We observe significant changes in the ENSO–Indian summer monsoon rainfall (ISMR) relationship in past three multidecadal epochs (early epoch: 1931–1960, middle epoch:... 相似文献
78.
Amira Khouas Mohamed Hamoudi Fatma Khaldaoui Hamza Mihoubi Yacine Rabah Hadji 《Arabian Journal of Geosciences》2017,10(23):522
Tahouda, former Roman Thabudeos, is situated 400 km south of Algiers (Algeria). It is one of the fortresses belonging to Roman south defense line in North Africa. This region is archaeologically very poorly known except for surface remains. The geophysical survey formed part of a wider research project designed to record and assess the landscape context of the longest Roman defense line in North Africa. We present the geophysical mapping and imaging using electric resistivity tomography and electromagnetics to help in investigating the subsurface properties of the region. Data were obtained using: (1) Saris resistance meter with up to 25 electrodes spaced at 2 m intervals and lines up to 50 m long. A total of 11 lines was obtained. (2) Geonics EM31, in two dipole configuration modes with 16 lines up to 100 m sampled every meter. These methods prove to be very powerful tools to give insight and locate the anthropologic remains from the surface to a depth of 6 m and outline their geometry. The results obtained by the two methods are consistent above the main remains like walls and rooms. 相似文献
79.
S. M. Hamza Amimul Ahsan M. A. Imteaz T. A. Mohammad A. H. Ghazali A. R. M. Shariff 《Arabian Journal of Geosciences》2017,10(7):168
Safeguarding groundwater from pollution is largely a global political decision. These decisions are basically supported by DRASTIC (D=Depth to water, R=Recharge, A=Aquifer media, S=Soil media, T=Topography, I=Impact of vadose zone, C=Hydraulic conductivity) analysis. Furthermore, water quality index (WQI) is an effective tool for groundwater quality evaluation and management. This study identifies the relationship between these two indices [i.e., pollution vulnerability index (PVI) and WQI]. The DRASTIC index of the study area was found to be from 60.4 to 178 characterized by very low, low, medium high, and very high vulnerability constituting of 12.88, 24.38, 34.11, 21.99, and 6.63% of the study area, respectively. In addition, the WQI of the area according to the analyzed parameters is between 10.19 and 55.63. It was established that a good correlation (61%) was found to exist between the two indices; which may be an indication that most pollutants present in the groundwater are likely due to anthropogenic activities on the land surface. 相似文献
80.
Feki-Sahnoun Wafa Njah Hasna Hamza Asma Barraj Nouha Mahfoudi Mabrouka Rebai Ahmed Bel Hassen Malika 《Ocean Dynamics》2020,70(7):897-911
Ocean Dynamics - The blooms of the toxic dinoflagellate Karenia selliformis can be predicted with accuracy derived from knowledge of the main forcing variables. A naive Bayes classifier modeling... 相似文献