Insilico evaluation of plant genetic resources to search for traits for adaptation to climate change     

Abdallah Bari  Hamid Khazaei  Frederick L. Stoddard  Kenneth Street  Mikko J. Sillanpää  Yogen P. Chaubey  Selvadurai Dayanandan  Dag T. F. Endresen  Eddy De Pauw  Ardeshir B. Damania 《Climatic change》2016,134(4):667-680

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Comparison of artificial neural network models for hydrologic predictions at multiple gauging stations in an agricultural watershed   总被引：1，自引：0，他引：1  

E. Mutlu  I. Chaubey  H. Hexmoor  S. G. Bajwa 《水文研究》2008,22(26):5097-5106

This paper reports on an evaluation of the use of artificial neural network (ANN) models to forecast daily flows at multiple gauging stations in Eucha Watershed, an agricultural watershed located in north‐west Arkansas and north‐east Oklahoma. Two different neural network models, the multilayer perceptron (MLP) and the radial basis neural network (RBFNN), were developed and their abilities to predict stream flow at four gauging stations were compared. Different scenarios using various combinations of data sets such as rainfall and stream flow at various lags were developed and compared for their ability to make flow predictions at four gauging stations. The input vector selection for both models involved quantification of the statistical properties such as cross‐, auto‐ and partial autocorrelation of the data series that best represented the hydrologic response of the watershed. Measured data with 739 patterns of input–output vector were divided into two sets: 492 patterns for training, and the remaining 247 patterns for testing. The best performance based on the RMSE, R² and CE was achieved by the MLP model with current and antecedent precipitation and antecedent flow as model inputs. The MLP model testing resulted in R² values of 0·86, 0·86, 0·81, and 0·79 at the four gauging stations. Similarly, the testing R² values for the RBFNN model were 0·60, 0·57, 0·58, and 0·56 for the four gauging stations. Both models performed satisfactorily for flow predictions at multiple gauging stations, however, the MLP model outperformed the RBFNN model. The training time was in the range 1–2 min for MLP, and 5–10 s for RBFNN on a Pentium IV processor running at 2·8 GHz with 1 MB of RAM. The difference in model training time occurred because of the clustering methods used in the RBFNN model. The RBFNN uses a fuzzy min‐max network to perform the clustering to construct the neural network which takes considerably less time than the MLP model. Results show that ANN models are useful tools for forecasting the hydrologic response at multiple points of interest in agricultural watersheds. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

Some Cosmological Models with Negative Potentials     

T. Singh  R. Chaubey  A. Singh 《Astrophysics》2018,61(3):391-407

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Bioprospection of marine actinomycetes: recent advances, challenges and future perspectives     

Sharma Swati  Fulke Abhay B.  Chaubey Asha 《海洋学报(英文版)》2019,38(6):1-2

In exploring new sources for economically important products, marine environment draws particular attention because of its remarkable diversity and extreme conditions; it is known to produce metabolic products of great value. It represents untapped source for the discovery of novel secondary metabolites with varying potential such as antibiotic, anti-tumor, antifouling and cytotoxic properties. Marine actinomycetes distributed throughout the marine environment from shallow to deep sea sediments have proved to be a finest source for this discovery. Secondary metabolites derived from marine actinomycetes have proved their worth in industries based on the research on their properties and wide range applications. Spotlight of the review is range of marine based actinomycetes products and significant research in this field. This shows the capability of marine actinomycetes as bioactive metabolite producers. Additionally, the present review addresses some effective and novel approaches of procuring marine microbial compounds utilizing the latest screening strategies of drug discovery from which traditional resources such as marine actinobacteria has decreased due to declining yields. The aim is in the context of promoting fruitful and profitable results in the near future. The recent surfacing of new technologies for bioprospection of marine actinomycetes are very promising, resulting in high quality value added products, and will be de? ning a new era for bioactive compounds with medical and biotechnological applications.  相似文献   

Bianchi type-V cosmological models with perfect fluid and dark energy     

T. Singh  R. Chaubey 《Astrophysics and Space Science》2009,319(2-4):149-154

We consider a self-consistent system of Bianchi type-V cosmology and binary mixture of perfect fluid and dark energy. The perfect fluid is taken to be one obeying the usual equation of state p=γ ρ with γ∈[0,1]. The dark energy is considered to be either the quintessence or Chaplygin gas. Exact solutions to the corresponding Einstein equations are obtained as a quadrature. The cases of disordered radiation and models with power-law and exponential expansion have discussed in detail. For large t, the models tend to be isotropic.  相似文献   

Photographic observations of Comet Halley (1982i)     

S. C. Joshi  J. B. Srivastava  C. D. Kandpal  T. D. Padalia  B. B. Sanwal  U. S. Chaubey  M. Singh 《Earth, Moon, and Planets》1987,38(3):249-252

Positions of Comet Halley have been measured from the photographic plates taken at Cassegrain focus of the 104-cm telescope of Uttar Pradesh State Observatory.  相似文献   

A new class of Bianchi cosmological models in f(R,T) gravity     

R. Chaubey  A. K. Shukla 《Astrophysics and Space Science》2013,343(1):415-422

The new class of cosmological model of the early Universe is considered with f(R,T) modified theories of gravity (Harko et al. in Phys. Rev. D 84:024020, 2011). The exact solutions to the corresponding field equations are obtained in quadrature form. The cosmological parameters have been discussed in detail. We have also discussed the well-known astrophysical phenomena, namely the Hubble parameter H(z), luminosity distance (d _L ) and distance modulus μ(z) with redshift.  相似文献   

Potato varietal discrimination using ground based multiband radiometer     

U. P. Shahi  Suman Kumar  N. P. Singh  A. K. Chaubey  Yogesh Kumar 《Journal of the Indian Society of Remote Sensing》2007,35(1):53-65

The potential usefulness of spectral properties and vegetation indices in varietal discrimination of potato genotypes was studied in the field experiment. Spectral measurements were recorded in different bands in blue (450–520 nm), green (520–590 nm), red (620–680 nm) and infrared (770–860 nm) of the electromagnetic spectrum at different stages during crop growth period. A ground based hand held multiband radiometer (Model/041) was used for the purpose. The mean per cent green reflectance value among different genotypes was lowest in genotype MS/86-89, while it was observed highest in genotype JX-216. Significant difference among these genotypes was found at all growth stages except 6 week after planting. Consequent to variation in spectral reflectance the vegetation indices like, NDVI, RVI, TVI and DVI showed significant difference among genotypes at all growth stages except at 8^th week after planting. The vegetation indices are good indicators of crop growth and condition. Similarly, fresh weight, dry weight, and leaf area index were also highest in MS/86-89, followed by KUFRI Bahar and KUFRI Sutlej while in case of leaf area index it was followed by Kufri Sutlej and Kufri Bahar. JX-23 was highest in chlorophyll content and tuber yield followed by MS/86-89 and JW-160, while lowest chlorophyll content was seen in MS/89-1095 and poorest tuber yield in MS/89-60. Most of the genotypes exhibited considerable variation in their spectral response and vegetation indices thereby indicating the possibility of their discrimination through remote sensing technique.  相似文献   

Emissions from the head of Comet Bradfield (1978c)     

U. S. Chaubey 《Astrophysics and Space Science》1979,64(1):53-56

The flux distribution in the head of Comet Bradfield (1978c) during the pre-perihelion period has been obtained in the wavelength range 400–640 nm. The emission fluxes at 474 nm, 516 nm, 564 nm and 589 nm are reported. By use of the observed monochromatic brightness of the Swan band sequences, the number of C₂ molecules in the head of the comet are estimated.  相似文献   

A spectrophotometric study of GG cassiopeiae     

U. S. Chaubey  Mahendra Singh 《Astrophysics and Space Science》1989,151(2):335-341

The continuum energy distributions of a totally eclipsing binary system GG Cas at phases 0 _. ^P 903 and 0 _. ^P 003 in the wavelenght range 3200–7600 Å have been presented and discussed. The flux of continuum of the secondary star seems to dominate longward of 4500 Å. The spectral types of the systemic components are found to be as B4+K0.  相似文献