Papers by Muhammad Chaudhary
Natural Product Research, 2009
Responses of dinitrogen fixation and photosynthetic activity in mashbean ( Vigna aconitifolia ) cultivars under low P conditions
Soil Science and Plant Nutrition, 1998
... 44(1), 31-41, 1998 Responses of Dinitrogen Fixation and Photosynthetic Activity in Mashbean (... more ... 44(1), 31-41, 1998 Responses of Dinitrogen Fixation and Photosynthetic Activity in Mashbean (Vigna aconitifolia) Cultivars under Low P Conditions Muhammad Iqbal Chaudhary and Kounosuke Fujita ... 10 5.40*' 6.55 NS 4.23 NS 4.96*' 2.57'" 6.02' 3.33 NS 7.28" 11.08" • ...
Comparison of phosphorus deficiency effects on the growth parameters of mashbean, mungbean, and soybean
Soil Science and Plant Nutrition, 1998
Abstract Experiments were conducted in order to examine the inter-specific difference in low P to... more Abstract Experiments were conducted in order to examine the inter-specific difference in low P tolerance in terms of biomass production, photosynthetic rate per unit leaf area (Po) and biological nitrogen fixation (BNF). Three legume species: mashbean (Vigna aconitifolia cv. ...
Natural Product Research, 2009
Journal of Molecular Graphics and Modelling, 2013
Virtual screening uses computer based methods to discover new ligands on the basis of biological ... more Virtual screening uses computer based methods to discover new ligands on the basis of biological structures. Among all virtual screening methods structure based docking has received considerable attention.
Effect of Various Rootstocks on Vigour and Productivity of Kinnow Mandarin
Pakistan Journal of Biological Sciences, 1999
The performance of Kinnow mandarin (Citrus reticulata Blanco) on six citrus rootstocks ie Citrume... more The performance of Kinnow mandarin (Citrus reticulata Blanco) on six citrus rootstocks ie Citrumelo 4475, Citrumelo 1452, Volkamariana, Yuma citrange, Mithi and Rough lemon was studied during its sixth and seventh year of transplanting. Plant height was not affected by the rootstocks ...
Phosphodiesterase Inhibitory Coumarinolignoids from Duranta repens
HETEROCYCLES, 2003
Durantins AC (1-3), new coumarinolignoids together with three known compounds cleomiscosins A (4)... more Durantins AC (1-3), new coumarinolignoids together with three known compounds cleomiscosins A (4), 6,7,8-trimethoxycoumarin (5) and 5,4'-dihydroxy-3,6,7-trimethoxyflavone (6) have been isolated from a CHCl 3 soluble fraction of Duranta repens. Their structures were assigned ...
Clematis huchouensis TAMURA: A Traditional Chinese Herbal Medicine and Its Quality Control Using a High Performance Liquid Chromatography Technique
Biological & Pharmaceutical Bulletin, 2007
A simple, specific and reliable high performance liquid chromatography (HPLC) method has been dev... more A simple, specific and reliable high performance liquid chromatography (HPLC) method has been developed and validated for study of fingerprint chromatograms of extracts from the whole plant of Clematis huchouensis TAMURA (CHT) for quality control of a traditional Chinese medicinal (TCM) herb. An Agilent C 18 column was used to separate extracts in this protocol and detection was made by ultraviolet absorbance at 340 nm. The column temperature was maintained at 25° C. A mobile phase consisting of (a) water (with 30 mM ...
Distribution of the triterpenoid saponins and chemotaxonomy of the genus Clematis L. by high-performance liquid chromatography–mass spectrometry
Biochemical Systematics and Ecology, 2010
Selected species of the genus Clematis (Ranunculaceae) have been screened for occurrence of trite... more Selected species of the genus Clematis (Ranunculaceae) have been screened for occurrence of triterpenoid saponins by qualitative HPLC-MSn analysis of root and rhizome materials from 18 Clematis samples as well as the whole plant materials of Clematis puberula var. ganpiniana and Clematis terniflora. The HPLC-MSn analysis allowing the detection of 17 oleanolic acid or hederagenin saponins was carried out in the negative selected ion monitoring (SIM) mode. Triterpenoid saponin profiles of these taxa were used ...
Acta Physiologiae Plantarum, 2008
Phosphorous (P) fertilization is the major mineral nutrient yield determinant among legume crops.... more Phosphorous (P) fertilization is the major mineral nutrient yield determinant among legume crops. However, legume crops vary widely in the ability to take up and use P during deficiency. The aim here was to compare P uptake and translocation, biological nitrogen fixing ability and photosynthetic rate among mashbean (Vigna aconitifolia cv. 'Mash-88'), mungbean (Vigna radiata cv. 'Moong-6601') and soybean (Glycine max L. cv. 'Tamahomare') during deficiency in hydroponics. Two treatments, the withdrawal of P from the solution (Pdeprivation) and continued P at 160 lM (P sufficient) were effected at the pod initiation stage. Plants were grown for 20 days. Short-term labeling with 32 P showed the uptake and distribution of P into plant parts. Withdrawal of P from the solution reduced biomass, photosynthetic activity, and nitrogen fixing ability in mungbean, and mashbean more than in soybean. P deprivation decreased P accumulation more than N accumulation. The decrease was more severe in mungbean and mashbean than soybean. More P was translocated and distributed into leaves in soybean than in mungbean and mashbean. Leaf P amount was more correlated to leaf area than to photosynthetic rate per unit leaf area among all three legume species. The results indicate that selection for increased efficiency of P utilization and leaf area may be used to improve leguminous crops.
Structural Survey, 2012
To cite this document: Muhammad Tariq Amin Chaudhary, (2012),"Implications of rising groundwater ... more To cite this document: Muhammad Tariq Amin Chaudhary, (2012),"Implications of rising groundwater level on structural integrity of underground structures -investigations and retrofit of a large building complex", Structural Survey, Vol. 30 Iss: 2 pp. 111 -129 Permanent link to this document: http://dx.
Journal of Bridge Engineering - J BRIDGE ENG, 2004
Identification of system parameters by recorded accelerographs on base-isolated bridges during ea... more Identification of system parameters by recorded accelerographs on base-isolated bridges during earthquakes provides an opportunity to investigate the performance of such bridges. Stiffness degradation in reinforced concrete piers of four multispan continuous base-isolated bridges in Japan during eighteen earthquakes is examined by using system identification results and theoretical loaddisplacement curves of reinforced concrete piers. Soil-structure interaction ͑SSI͒ effect identified in these bridges is found to be independent of free field acceleration and weakly dependent on dynamic soil properties. This apparent contradiction with the popular belief of strong SSI in weaker soil prompted to consider the fact that with increasing seismic intensity, similar degradation in pier stiffness also takes place and it is the ratio of pier and foundation stiffness (k c /k h ) which should be examined to determine the influence of SSI. A relatively strong relationship between these variables supports the hypothesis that SSI is more strongly related to the stiffness ratio of pier and foundation than dynamic soil properties.
The Structural Design of Tall and Special Buildings, 2009
This paper describes the options and methodology adopted for the design of an 18-m high support t... more This paper describes the options and methodology adopted for the design of an 18-m high support tower for a vibration sensitive optical telescope. The telescope was to be housed inside an existing building that provided shielding from atmospheric wind and thermal variations. However, proper functioning of the telescope was dependent on the support tower's structural confi guration and stiffness to limit angular distortion of the telescope platform to less than 2 µ radians or 0·4 arc-sec. This level of sensitivity required investigation of support tower response under ambient vibrations resulting from normal operation of the existing facility. The measured peak ambient vibration acceleration ranged from 0·04 m/s/s to 0·27 m/s/s for various recorded events. Two options for the tower were investigated viz. steel braced frame and concrete shaft. The effect of soil structure interaction (SSI) was also examined. It was concluded that the concrete tower option provided the desired performance for both fi xed base and SSI cases. On the other hand, the steel tower performed well for the fi xed base case but its performance was close to the threshold when SSI was also considered. Effect of soil properties variation on SSI was also examined for both tower options and was found to be relatively insignifi cant.
Structural Control and Health Monitoring, 2008
A general framework for structural health monitoring (SHM) of bridges employing system identifica... more A general framework for structural health monitoring (SHM) of bridges employing system identification (SI) and performance evaluation methodology based on sparsely recorded seismic data is presented. Components of SHM are described and a theoretical formulation for SI of a non-classically damped, baseisolated bridge system is derived and implemented for four bridges. The performance of the base-isolated super-structure is examined by comparing the behavior of isolation bearings with the experimental results carried out in the laboratory. The influence of soil-structure interaction (SSI) is examined by comparing the identified values with the theoretical physical properties of the pile-supported sub-structure. It is concluded that the proposed SI methodology is effective and the proposed performance evaluation methodology can be implemented in SHM of bridges. Figure 11. Comparison of identified, physical and fixed base sub-structure stiffnesses: (a) Matsunohama A; (b) Matsunohama B; (c) Onneto; and (d) Yama-age. M. T. A. CHAUDHARY AND Y. FUJINO 1032
Practice Periodical on Structural Design and Construction, 2008
This paper deals with determination of actual design moment in the flexural design of ultradeep r... more This paper deals with determination of actual design moment in the flexural design of ultradeep reinforced concrete rafts. Due to diagonal crack in concrete, the workpoint of the internal tension-compression couple resisting the applied moment is shifted by a distance equal to the effective depth of the member. This shift in the workpoint necessitates that the design moment at a particular section shall also be shifted accordingly. The case is highlighted with the example of a 9.0 m ͑29.5 ft͒ deep circular raft that is acted upon by upward buoyant forces as well as downward gravity loads. Design moments in various regions of the raft increased by 1.3 to 248% after application of the moment shift rule described in the paper. The substantial increase in moment values signifies the importance of the phenomena for ultradeep reinforced concrete rafts.
Journal of Structural Engineering, 2000
Identification of system parameters from seismic accelerations recorded on a base-isolated bridge... more Identification of system parameters from seismic accelerations recorded on a base-isolated bridge provides an excellent opportunity to examine the performance of various components of such bridge systems. This study proposes a two-step system identification method for identifying structural parameters from strong motion records. The first step entails identification of complex modal parameters of a nonclassically damped base-isolated bridge-pier-pile-foundation system for which necessary theoretical formulations are first derived. In the second step a global search scheme is introduced to identify the structural parameters of the system corresponding to the identified modal parameters. The proposed system identification method is applied to two base-isolated bridges such that recorded responses at pier cap and girder are successfully recreated for one main shock and four aftershocks of the 1995 Kobe earthquake and modal and structural parameters are identified. Performance of the base-isolation system is evaluated by comparing the physical properties of the bearings, determined from experimental data, with the identified values and is found to be satisfactory in both bridges.
Journal of Bridge Engineering, 2004
Identification of system parameters by recorded accelerographs on base-isolated bridges during ea... more Identification of system parameters by recorded accelerographs on base-isolated bridges during earthquakes provides an opportunity to investigate the performance of such bridges. Stiffness degradation in reinforced concrete piers of four multispan continuous base-isolated bridges in Japan during eighteen earthquakes is examined by using system identification results and theoretical loaddisplacement curves of reinforced concrete piers. Soil-structure interaction ͑SSI͒ effect identified in these bridges is found to be independent of free field acceleration and weakly dependent on dynamic soil properties. This apparent contradiction with the popular belief of strong SSI in weaker soil prompted to consider the fact that with increasing seismic intensity, similar degradation in pier stiffness also takes place and it is the ratio of pier and foundation stiffness (k c /k h ) which should be examined to determine the influence of SSI. A relatively strong relationship between these variables supports the hypothesis that SSI is more strongly related to the stiffness ratio of pier and foundation than dynamic soil properties.
Journal of Structural Engineering-asce, 2000
Identification of system parameters from seismic accelerations recorded on a base-isolated bridge... more Identification of system parameters from seismic accelerations recorded on a base-isolated bridge provides an excellent opportunity to examine the performance of various components of such bridge systems. This study proposes a two-step system identification method for identifying structural parameters from strong motion records. The first step entails identification of complex modal parameters of a nonclassically damped base-isolated bridge-pier-pile-foundation system for which necessary theoretical formulations are first derived. In the second step a global search scheme is introduced to identify the structural parameters of the system corresponding to the identified modal parameters. The proposed system identification method is applied to two base-isolated bridges such that recorded responses at pier cap and girder are successfully recreated for one main shock and four aftershocks of the 1995 Kobe earthquake and modal and structural parameters are identified. Performance of the base-isolation system is evaluated by comparing the physical properties of the bearings, determined from experimental data, with the identified values and is found to be satisfactory in both bridges.
Engineering Structures, 2002
The seismic response of a base-isolated bridge is investigated with the help of acceleration data... more The seismic response of a base-isolated bridge is investigated with the help of acceleration data recorded during four moderate 54 to small earthquakes. It is observed that the dynamic behavior of the bridge is not typical of base-isolated bridges as some of the 55 transverse side-stoppers obstructed the movement of isolation bearings. Examination of the recorded transfer functions revealed 56 that the dynamics of the bridge is dominated by the fundamental mode. Fundamental modal frequency and damping ratio of the 57 bridge are identified and consequences of malfunctioning of isolation bearings are examined. It is found that malfunctioning of 58 base-isolation bearings at one pier resulted in substantially unequal lateral load distribution to the substructure which signifies the 59 attention to be devoted to such structural details for desired working of the whole system.
Engineering Structures, 2001
Identification of system parameters with the help of records made on a base-isolated bridge durin... more Identification of system parameters with the help of records made on a base-isolated bridge during earthquakes, provides an excellent opportunity to study the performance of various components of such a bridge system under these loading conditions. This study utilizes a two-stage system identification methodology for identifying the modal and structural parameters of base-isolated Yama-agé bridge in Japan from multiple set of recorded seismic acceleration data. By comparing the identified and physical parameters, performance of the base-isolation system is evaluated and the effect of soil-structure interaction on the overall performance of the bridge is examined.
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Papers by Muhammad Chaudhary