<Emphasis Type="Italic">Integrated Remote Sensing and</Emphasis> Structural Analysis Studies of Tayyib Al-Ism Area,Northwestern Arabian Shield,Saudi Arabia     

Osama M. K. Kassem  Habes A. Ghrefat  Haider Zaman  Awni T. Batayneh  Saad Almogren  Yousef Nazzal  Eslam Elawadi 《Journal of the Indian Society of Remote Sensing》2016,44(1):91-99

Geological and structural mappings of Tayyib Al-Ism area were carried out using the rocks finite strain data, the Landsat-7 Enhanced Thematic Mapper Plus (ETM+) data and the field based observations. To analyze the finite strain in the studied rocks, the R_f /? and Fry methods are applied to feldspar porphyroclasts and mafic grains from nine metavolcano-sedimentary samples (Hegaf Formation), four diorite-gabbros suite samples (Sawawin Complex), two meta-granite samples (Ifal suite) and five Zuhd alkali granite samples. The obtained data indicate traces of high to moderate level of deformation in the meta-granite and metavolcano-sedimentary rocks. The axial ratios along the XZ section range from 1.70 to 4.80 for the R_f/? method and from 1.50 to 4.50 for the Fry method. A sub-vertical trend of short axes in association with sub-horizontal foliation is also observed. These informations allow us to conclude that a finite strain in the deformed granitic rocks is of the same order of magnitude as in the metavolcano-sedimentary rocks. The contacts between the metavolcano-sedimentary and granitic rocks in Tayyib al Ism area were formed during the granitic intrusions along some of the faults under brittle to semi-ductile deformation conditions. These faults have significantly influenced the geometry and style of rifting in the Red Sea during the Neogene. The finite strain was accumulated in the area during the process of deformation, which superimpose the already existed nappe structure. It indicates that the nappe contacts formed during the accumulation of finite strain. In addition to finite strain analysis, band ratio images (3/1, 5/3, 7/5) and Principal Component Analysis (PCA) technique have been used, which proved effective in mapping geological and structural features of various rock bodies exposed in the study area.  相似文献   

A study of soft computing models for prediction of longitudinal wave velocity     

Jayraj Singh  A. K. Verma  Haider Banka  T. N Singh  Sachin Maheshwar 《Arabian Journal of Geosciences》2016,9(3):224

Genetic algorithm (GA) and support vector machine (SVM) optimization techniques are applied widely in the area of geophysics, civil, biology, mining, and geo-mechanics. Due to its versatility, it is being applied widely in almost every field of engineering. In this paper, the important features of GA and SVM are discussed as well as prediction of longitudinal wave velocity and its advantages over other conventional prediction methods. Longitudinal wave measurement is an indicator of peak particle velocity (PPV) during blasting and is an important parameter to be determined to minimize the damage caused by ground vibrations. The dynamic wave velocity and physico-mechanical properties of rock significantly affect the fracture propagation in rock. GA and SVM models are designed to predict the longitudinal wave velocity induced by ground vibrations. Chaos optimization algorithm has been used in SVM to find the optimal parameters of the model to increase the learning and prediction efficiency. GA model also has been developed and has used an objective function to be minimized. A parametric study for selecting the optimized parameters of GA model was done to select the best value. The mean absolute percentage error for the predicted wave velocity (V) value has been found to be the least (0.258 %) for GA as compared to values obtained by multivariate regression analysis (MVRA), artificial neural network (ANN), adaptive neuro-fuzzy inference system (ANFIS), and SVM.  相似文献   

刀额新对虾主要过敏原蛋白的肽指纹图谱鉴定与分析   总被引：1，自引：0，他引：1  

林洪  郑礼娜  李振兴  Samee Haider 《中国海洋大学学报(自然科学版)》2009,39(5)

以我国常见的刀额新对虾为研究对象,旨在获得其主要过敏原的氨基酸序列等基础数据,增加对虾类过敏原的认识和理解。分离和纯化了分子量为36 kD的虾主要过敏原蛋白,利用激光辅助解析/飞行时间质谱对其进行肽质量指纹图谱鉴定,并对鉴定的结果采用Mascot搜索引擎在NCBInr数据库上进行搜索。结果表明刀额新对虾主要过敏原蛋白与斑节对虾原肌球蛋白匹配分值最高为268,吻合肽段27条,序列覆盖率为65%;与其它无脊椎动物如腐食酪螨、衣鱼等的原肌球蛋白的序列覆盖率也很高,分别达到了51%和53%。这一结果不仅表明了刀额新对虾与其它甲壳类海产品过敏原存在着高度同源性,而且为其与甲壳类及其它无脊椎动物主要过敏原之间存在严重交叉反应的现象提供了理论依据。  相似文献   

Optimization of preparative separation and purification of total polyphenols from Sargassum tenerrimum by column chromatography     

Samee Haider  Zhenxing Li  Hong Lin  Khalid Jamil 《中国海洋大学学报(英文版)》2009,8(4):425-430

Polyphenols from the ethanol extracts of Sargassum tenerrimum (ST) with potent antiallergic effects were studied to optimize separation process through column chromatography. The adsorption and desorption characteristics of three widely used adsorbents: macroporous resin, silica gel, and polyvinylpolypyrrolidone (PVPP), were critically evaluated respectively and studied for the optimization of preparative separation of polyphenols. Static operations on these adsorbents showed that macroporous resin had the best adsorption and desorption capability among the three adsorbents. Dynamic adsorption and desorption with macroporous resin packed column were also conducted to optimize the parameters such as: with the optimal values shown in brackets, the concentration of extract solution (4 times diluted), pH value (6–7), adsorption speed (3 BV h⁻¹, bed volumes/per hour), concentration of ethanol (80%), elution speed (3 BV h⁻¹) and elution volume (7 BV). The chromatographic process so optimized gave a purity of 62.43% from the crude polyphenols, providing a promising basis for large scale preparation of bioactive polyphenols upon further scaling up tests.  相似文献   

Optimization of Preparative Separation and Purification of Total PolyphenoJs from Sargassum tenerrimum by Column Chromatography     

Samee Haider  LI Zhenxing  LIN Hong  Khalid Jamil 《青岛海洋大学学报(英文版)》2009,(4):425-430

Polyphenols from the ethanol extracts of Sargassum tenerrimum （ST） with potent antiallergic effects were studied to optimize separation process through column chromatography. The adsorption and desorption characteristics of three widely used adsorbents： macroporous resin, silica gel, and polyvinylpolypyrrolidone （PVPP）, were critically evaluated respectively and studied for the optimization of preparative separation of polyphenols. Static operations on these adsorbents showed that macroporous resin had the best adsorption and desorption capability among the three adsorbents. Dynamic adsorption and desorption with macroporous resin packed column were also conducted to optimize the parameters such as： with the optimal values shown in brackets, the concen- tration of extract solution （4 times diluted）, pH value （6-7）, adsorption speed （3BVh-1, bed volumes/per hour）, concentration of ethanol （80%）, elution speed （3 BV ht） and elution volume （7 BV）. The chromatographic process so optimized gave a purity of 62.43% from the crude polyphenols, providing a promising basis for large scale preparation of bioactive polyphenols upon further scaling up tests.  相似文献   

Model of photoelectron impact ionization within the high latitude ionosphere at Mars: Comparison of calculated and measured electron density     

S.A. Haider  S.P. Seth  V.R. Choksi 《Icarus》2006,185(1):102-112

The production rate, ion density and electron density are calculated between longitudes 0° and 360° E due to incident radiation of wavelength range 1-102.57 nm in the dayside atmosphere of Mars. These calculations are made by using global analytical yield spectrum (AYS) model at solar zenith angle 80° between latitudes 50° and 70° N for spring equinox and medium solar activity condition. These conditions are appropriate for Mars Global Surveyor (MGS) Phase 2 aerobraking period during which both the accelerometer and the radio occultation data are used. The calculated results are compared with MGS radio occultation measurements carried out at different latitudes (64.7°-67.3° N) and longitudes (0°-360° E) in December 1998 between solar zenith angle 78° and 81°. This measurement shows primary and secondary ionization peaks, which are varying with longitudes. Our calculation suggests that first peak is produced by photoionization and photoelectron impact ionization processes due to absorption of solar EUV radiation (9-102.57 nm). The second peak is produced by photoelectron impact ionization of soft X-ray photon (1-9 nm). There is a good agreement between our calculation and measurement as far as the maximum and the minimum values of primary peak altitude/peak density of electrons are concerned. However, the calculated values of secondary peak density and peak altitude are higher than the measured values by a factor of 1.5-2.0 and 1.1, respectively. The secondary peak is brought into agreement with the measurement using low X-ray flux by a factor of 2 to 3 below 9 nm. The longitudinal distribution of calculated and measured peak density and peak altitude are fitted by least-square method with 0.95 confidence limits.  相似文献   

Laboratory simulations of PH₃ photolysis in the atmospheres of Jupiter and Saturn     

J.P. Ferris  Haider Khwaja 《Icarus》1985,62(3):415-424

Photolysis of NH₃PH₃ mixtures (11 Torr) at 175°K resulted in the same initial rate of P₂H₄ formation as when the 11 Torr of pure PH₃ was photolyzed. A higher yield of P₂H₄ is obtained at 175°K than at 298°K because some of the P₂H₄ condenses on the cell wall at 175°K and is not subject to further reaction. Some reaction of P₂H₄ is taking place as observed by the decrease in its yield and on the formation of red phosphorus on extended photolysis of PH₃ at 175°K. No NH₂PH₂ or (PN)_x were detected as photoproducts as indicated by the absence of change in the UV spectral properties of the P₂H₄ and red phosphorus fraction, respectively, when NH₃ is present. Although the pathway for PH₃ decomposition is changed, the outcome of the photochemical process is essentially the same in the absence or presence of NH₃. The formation of P₂H₄ and red phosphorus was not inhibited by small amounts of C₂H₄ and C₂H₂, so the low levels of hydrocarbons on Jupiter and Saturn will not have a significant effect on the course of PH₃ photolysis. The ratio of products of PH₃ photolysis are only slightly affected by the wavelength of light used. Use of xenon lamp, with a continuous emission in the ultraviolet where P₂H₄ absorbs, results in only a modest decrease in the yield of P₂H₄ and a modest increase in the rate of formation of red phosphorus as compared to the rates observed with a 206.2-nm light source. The quantum yield for P₂H₄ formation is pressure independent in the 0.5–11 Torr range. This quantum yield is not affected by lowering the temperature to 157°K or by the addition of 100 Torr of H₂. It is concluded that photolysis of PH₃ to P₂H₄ and the subsequent conversion of P₂H₄ to red phosphorus are likely procses on Jupiter and Saturn and that particles of P₂H₄ condense in the atmospheres of these planets. The conversion of some of the P₂H₄ to red phosphorus may take place on Jupiter.  相似文献   

Weather yield model for the semi tropical region (Pakistan)     

Syed Faizan Haider  K. H. Asif  Amjad Hussain Gilani 《大气科学进展》1992,9(3):367-372

Weather models are essential tools for checking of the effect of the weather elements in terms of their effect on the production of the crop. This research is an attempt to see the effect of only two variables i.e., temperature and rainfall for the division Faisalabad (semitropical region of Pakistan).The model fitted is of the linear form:the values of a,b, c have been found. The expected yield has been calculated by using the aridity indices (X1 and X2 ) and the result in the form of coefficient of determination R2 has been found equal to 0.166. The significance of the regression coefficient has been tested, which shows that the contribution to the yield from aridity index at germination and that at ripening is significant.The wheat yields are the results of a wide variety of variables, most of which show varying degree of relationship with one another, some positive and some negative in terms of output. These variables may be technology, fertilizers, pesticides, epidemics, kinds of seeds used, market price of crop and the area under cultivation etc, which can be the source of variation in the wheat yield. Since rainfall during germination and temperature at the ripening periods are the necessary factors for the yield of wheat, for this purpose these parameters have been studied in order to their contribution.  相似文献   

Anomalously shallow inclination in middle–northern part of the South China block: palaeomagnetic study of Late Cretaceous red beds from Yichang area     

Kazutoshi Narumoto  Zhenyu Yang  Kazuhiro Takemoto  Haider Zaman  Hayao Morinaga  Yo-ichiro Otofuji 《Geophysical Journal International》2006,164(2):290-300

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Palaeomagnetic study of Cretaceous red beds from the eastern Hindukush ranges, northern Pakistan: palaeoreconstruction of the Kohistan–Karakoram composite unit before the India–Asia collision     

Haider Zaman  & Masayuki Torii 《Geophysical Journal International》1999,136(3):719-738

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