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2021

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Geochemistry Of Phosphatic Nodules As A Tool For Understanding Depositional And Taphonomical Settings In A Palaeolithic Cave Site (San Teodoro, Sicily), Gerlando Vita, Vittorio Garilli, Mirko Andrea Vizzini, Renato Giarrusso, Angelo Mulone, Massimiliana Pinto Vraca, Valeria La Parola, Pierluigi Rosina, Laura Bonfiglio, Luca Sineo Sep 2021

Geochemistry Of Phosphatic Nodules As A Tool For Understanding Depositional And Taphonomical Settings In A Palaeolithic Cave Site (San Teodoro, Sicily), Gerlando Vita, Vittorio Garilli, Mirko Andrea Vizzini, Renato Giarrusso, Angelo Mulone, Massimiliana Pinto Vraca, Valeria La Parola, Pierluigi Rosina, Laura Bonfiglio, Luca Sineo

International Journal of Speleology

Interpreting depositional settings of cave sites is generally problematic, especially in absence of paleontological/archaeological evidence. This is the case of some deposits at San Teodoro Cave (Sicily), a key site for the Mediterranean Palaeolithic. In a stratigraphic level interrupted by a carbonatic concretion, phosphatic nodules are present only in the part enclosed between the concretion and the cave wall. The discovery of these nodules combined with the punctual lack of fossils had initially suggested an erosion phenomenon and subsequent formation of nodules at a vadose level. Here we show the usefulness of an integrated, geochemical-paleoecological approach in defining stratigraphy and …

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Depression In Collegiate Runners And Soccer Players: Relationships With Serum 25-Hydroxyvitamin D, Ferritin And Fractures, Devin C. Tomlinson, Evan Eschker, Jade Callan, Tamara Hew-Butler Sep 2021

Depression In Collegiate Runners And Soccer Players: Relationships With Serum 25-Hydroxyvitamin D, Ferritin And Fractures, Devin C. Tomlinson, Evan Eschker, Jade Callan, Tamara Hew-Butler

International Journal of Exercise Science

International Journal of Exercise Science 14(5): 1099-1111, 2021. The main purpose of this study was to evaluate relationships between depression versus serum 25-hydroxyvitamin D (vitamin D), serum ferritin (ferritin), and fractures across a competitive season. The authors conducted a prospective observational study (both pre- and post-season testing) on 51 collegiate soccer and cross-country athletes from a Midwest University. Our main outcome measure was depression, measured using the Center for Epidemiological Studies Depression Scale (CES-D). A CES-D score ≥ 16 represented the threshold value for clinical depression. Secondary outcome variables included vitamin D, ferritin, and fractures. Two athletes (3.9%; one female) …

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Water Management For Establishment Of Alfalfa (Medicago Sativa L.), J. B. Rassini, E. J. A. Leme Sep 2021

Water Management For Establishment Of Alfalfa (Medicago Sativa L.), J. B. Rassini, E. J. A. Leme

IGC Proceedings (1977-2023)

This research was carried out in 1997, at the “Centro de Ciências Agrárias” of the “Universidade Federal de São Carlos”, in Araras, SP, Brazil, to evaluate the behavior of three growth stages (S1 = initial vegetative stage, S2 = full vegetative stage, and S3 = reproductive stage) of the “Crioula” alfalfa cultivar, in the presence of four water levels (L1 = 100%, L2 = 80%, L3 = 45-50% and, L4 =20-25% of a sprinkler irrigation) in a field trial. Growth stages changed according to water levels, and S2 stage was the most …

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High Salinity Effects On The Components Of Relative Growth Rate In Rhodes Grass, E. Taleisnik, L. García Seffino, A. Córdoba, K. Grunberg, C. Arias, M. De Luca Sep 2021

High Salinity Effects On The Components Of Relative Growth Rate In Rhodes Grass, E. Taleisnik, L. García Seffino, A. Córdoba, K. Grunberg, C. Arias, M. De Luca

IGC Proceedings (1977-2023)

Rhodes grass (Chloris gayana Kunth), is widely cultivated in the semiarid tropics and favored for its salt tolerance. Nevertheless, productivity decreases significantly under saline conditions, especially in tetraploid cultivars. The purpose of this work was to explore, in tetraploid cultivar Boma, the physiological causes for the observed salt-associated growth reduction. The effects of high salinity (200 mM NaCl) on the components of relative growth rate were analyzed in greenhouse experiments. An early reduction in leaf area expansion was observed, which later resulted in decreased dry matter accumulation. Plant leafiness was reduced by effects both on dry matter allocation to …

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Evaluation Of Fertilizing Methods On The Establishment Of Pasture Species On Native Pasture By Direct Sowing, O. L. P. Oliveira, S. S. Gonzaga, J. O. N. Gonçalves, E. N. Muniz, T. M. S. Freitas, L. P. Grando Sep 2021

Evaluation Of Fertilizing Methods On The Establishment Of Pasture Species On Native Pasture By Direct Sowing, O. L. P. Oliveira, S. S. Gonzaga, J. O. N. Gonçalves, E. N. Muniz, T. M. S. Freitas, L. P. Grando

IGC Proceedings (1977-2023)

The experiment was carried out in the southern of Brazil, by direct sowing ryegrass (Lolium multiflorum), white clover (Trifolium repens), birds foot trifolium (Lotus corniculatus) and red clover (Trifolium pratensis) on native pasture. Herbicide Glyfosate was previously applied on this native pasture. The treatments were T1 -seed sowing in row with half fertilizer in row and half broadcasting; T2 – seed sowing in row with all fertilizer in row; T3 – seed sowing in row and all fertilizer broadcasting; T4 – seed and fertilizer broadcasting. The pasture was evaluated by two cuts …

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Interactions Between The Effects Of Nitrogen, And Phosphorus, Potassium And Sulphur On Grass Production, J. D. Morton, L. C. Smith Sep 2021

Interactions Between The Effects Of Nitrogen, And Phosphorus, Potassium And Sulphur On Grass Production, J. D. Morton, L. C. Smith

IGC Proceedings (1977-2023)

The interactions between rates of nitrogen (N) and rates of phosphorus (P), potassium (K) or sulphur (S) on yield of ryegrass dominant swards were measured with no return of mown clippings in Southland, New Zealand. In the second year of the trial, the yield response to 176 kg N ha-1 compared with no N increased only slightly with increasing soil Olsen P from 8 to 91 µg g-1 soil. At 352 and 704 kg N ha-1 there was a large increase in the yield response (from 5 to 9.4 and 11 t DM ha-1 respectively) up …

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Isolating Detrital And Diagenetic Signals In Magnetic Susceptibility Records From Methane-Bearing Marine Sediments, Joel E. Johnson, Stephen C. Phillips, William C. Clyde, Liviu Giosan, Marta E. Torres Sep 2021

Isolating Detrital And Diagenetic Signals In Magnetic Susceptibility Records From Methane-Bearing Marine Sediments, Joel E. Johnson, Stephen C. Phillips, William C. Clyde, Liviu Giosan, Marta E. Torres

Faculty Publications

Volume-dependent magnetic susceptibility (κ) is commonly used for paleoenvironmental reconstructions in both terrestrial and marine sedimentary environments where it reflects a mixed signal between primary deposition and secondary diagenesis. In the marine environment, κ is strongly influenced by the abundance of ferrimagnetic minerals regulated by sediment transport processes. Post-depositional alteration by H2S, however, can dissolve titanomagnetite, releasing reactive Fe that promotes pyritization and subsequently decreases κ. Here, we provide a new approach for isolating the detrital signal in κ and identifying intervals of diagenetic alteration of κ driven by organoclastic sulfate reduction (OSR) and the anaerobic oxidation of …

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Use Of Electronic Resources Among Library Science Students Of Kashmir, Javaid Wagay, Dr Pc Sehgal Sep 2021

Use Of Electronic Resources Among Library Science Students Of Kashmir, Javaid Wagay, Dr Pc Sehgal

Library Philosophy and Practice (e-journal)

. The electronic resources are also known as online information resources covering bibliographic databases, electronic reference books, search engines for full text books, and digital collections of data. At present, the libraries actively procure, organize, display and issue e-forms of books, journals, newspapers, theses and dissertations .In this study, the researcher analyzed the electronic resources usage among the Library science students of Kashmir. Further, the paper aims to highlight the problems faced by Library science students in accessing e-resources, their opinions on feature of e-resources, and their views on usefulness of e-resources compared to that of conventional sources. Because of …

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A Quest For More Equitable Experiences For All Students During A Global Pandemic: An Inquiry Into Remote Delivery Of De-Tracked Chemistry And Biology Classes, Mayra Cordero, Elizabeth Davis Sep 2021

A Quest For More Equitable Experiences For All Students During A Global Pandemic: An Inquiry Into Remote Delivery Of De-Tracked Chemistry And Biology Classes, Mayra Cordero, Elizabeth Davis

Journal of Practitioner Research

Through our collaboration, we helped one another rethink and adapt the delivery of our de-tracked science courses for remote instruction as we finished out the 2019-2020 school year, with a particular focus on developing remote instruction practices that would support our learners struggling in our secondary science de-tracked classrooms. We derived three actions to take to target the needs of our students who struggled and to differentiate our instruction. We reduced the amount of material being covered to allow for deeper dives into content, prioritized depth of learning over breadth of learning; connected our remote lessons to our students’ real-world …

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Introduction To The Special Issue: Inquiring Into, About, And During Covid-19, Nancy Fichtman Dana, Karen L. Kilgore Sep 2021

Introduction To The Special Issue: Inquiring Into, About, And During Covid-19, Nancy Fichtman Dana, Karen L. Kilgore

Journal of Practitioner Research

One of the most pervasive ways the inquiry movement has needed to be reshaped since its inception is as a mechanism to respond to a global pandemic. As COVID-19 necessitated an abrupt transition to remote delivery of instruction, teachers needed a powerful form of professional learning to understand and respond with changes to serve their students during this challenging time. At P. K. Yonge Developmental Research School, a K-12 school, the leadership team designed a Canvas website devoted to teacher inquiry, enabling teachers to share experiences, collaborate, and address issues regarding the abrupt transition to emergency remote instruction. In this …

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Facile Development, Characterization, And Optimization Of New Nano-Demulsifiers System For Treating Water In-Crude Oil Emulsions, Magdy A.Zahran, Mohamed M. Mohammady, Hany M. Abd El-Raheem, Moneer M. Basuni Sep 2021

Facile Development, Characterization, And Optimization Of New Nano-Demulsifiers System For Treating Water In-Crude Oil Emulsions, Magdy A.Zahran, Mohamed M. Mohammady, Hany M. Abd El-Raheem, Moneer M. Basuni

International Journal of Thin Film Science and Technology

A novel series of new nano-demulsifiers based on a polymerizable nonionic surfactant for treating water-in-crude oil emulsions were prepared, characterized and evaluated. The results were obtained from various characterizations such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), Size Exclusion Chromatography (SEC), Zeta-sizer and Zeta-potential revealed that the polymer were prepared in amorphous form with the variety of particle sizes 30-120 nm. The efficiency of these demulsifiers was tested in water-in-oil emulsions (w/o) at different concentrations (50, 100 and 200 ppm).The results showed that, the nano-demulsifier samples are effective and achieved, the complete separation of the water during …

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Influence Of Deposition Parameters On Optical Properties Of Sputtered Tungsten Oxide Films, Christopher Mkirema Maghanga Sep 2021

Influence Of Deposition Parameters On Optical Properties Of Sputtered Tungsten Oxide Films, Christopher Mkirema Maghanga

International Journal of Thin Film Science and Technology

Thin films of tungsten oxide were deposited on glass substrates at different temperatures and O2/Ar ratios using DC Magnetron sputtering system. The samples were characterized using x-ray diffractometry and spectrophotometer structurally and optically respectively. Analysis of the results reveals dependence of structure on thickness and temperature. The O2/Ar ratio is also found to influence the optical properties appreciably for the entire wavelength range studied. Visual inspection of the films show that O2/Ar ratio influences the coloration of the film which varies from clear to dark blue for high to low O2/Ar ratios respectively.

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Synthesis Of Cdo Nps For Antimicrobial Activity, Ahmed N. Abd, Mohammed F. Al –Marjani, Zahraa A. Kadham Sep 2021

Synthesis Of Cdo Nps For Antimicrobial Activity, Ahmed N. Abd, Mohammed F. Al –Marjani, Zahraa A. Kadham

International Journal of Thin Film Science and Technology

: In this study, (50 - 110) nm cadmium oxide (CdO) nanoparticles were synthesized by chemical method. The optical, structural and topographical properties of the synthesized nanoparticles were investigated by using UV-VIS absorption, Transmission electron microscopy TEM, atomic force microscopy AFM, and x-ray diffraction XRD. The bacterial resistance represents a problem and the outlook for the use of antibiotics in the future is still uncertain. Therefore, it must be taken measures to reduce this problem. Antibacterial activity of the Cadmium oxide nanoparticles were investigated against several pathogenic bacteria, including Klebsiella pneumoniae; Acinetobacter baumannii; Pseudomonas aeruginosa and Staphylococcus aureus by using …

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Effect Of Deposition Parameters On Optical And Electrical Properties Of Sno2: Al Thin Films Prepared By Spray Pyrolysis Technique For Optoelectronic Devices, P. N. Onkundi, K. M. Munji, D. B. Bem, B. Muthoka Sep 2021

Effect Of Deposition Parameters On Optical And Electrical Properties Of Sno2: Al Thin Films Prepared By Spray Pyrolysis Technique For Optoelectronic Devices, P. N. Onkundi, K. M. Munji, D. B. Bem, B. Muthoka

International Journal of Thin Film Science and Technology

Transparent Aluminum doped tin oxide (SnO2:Al) thin films with different Al percentage (1.96%, 3.85%, 5.66%, 7.41% and 9.09%) were fabricated using a low cost spray pyrolysis technique at optimized deposition parameters. Substrate temperature, carrier gas pressure and spray outlet to substrate distance were varied to obtain optimum conditions for deposition. Optical characterization of the deposited films was carried out to the average transmittance, optical constants (refractive index (n) and extinction coefficient (k)) and the band gap. The calculated refractive indexes of the films with various Al concentrations were in the range of 1.469 Al at. % to 1.914 Al at. …

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Structural, Optical, Luminescence And Morphological Properties Of Rod Shaped Cdo Biotemplate Synthesized By Via Hen Egg-Albumen Extract For Anti-Cervical Cancer Application, K. Mohanraj, D. Balasubramanian, N. Jhansi, M. Saravanabhavan, J. Chandrasekaran Sep 2021

Structural, Optical, Luminescence And Morphological Properties Of Rod Shaped Cdo Biotemplate Synthesized By Via Hen Egg-Albumen Extract For Anti-Cervical Cancer Application, K. Mohanraj, D. Balasubramanian, N. Jhansi, M. Saravanabhavan, J. Chandrasekaran

International Journal of Thin Film Science and Technology

In this work, the CdO biotemplate nanorods were synthesized by chemical rout assisted microwave irradiation method via Hen egg-albumin extract. The CdO biotemplate nanorods were characterized by various characterization techniques such as X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), High resolution scanning electron microscope (HRSEM), Transmission electron microscope (TEM), Energy dispersive X-rays spectroscopy (EDX), Ultra violet-Vis diffused reflectance spectroscopy (UV-Vis-DRS) and Photoluminescence spectroscopy (PL). The XRD patterns of CdO biotemplate nanorods show in cubic phase structure with average particle size 21-23 nm. Functional groups present in the compound were analyzed by FTIR technique. The HRSEM photograph shows the …

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Structural, Optical And Electrical Properties Of Green Synthesis Cdo Nanoparticles And Its Ag/Cdo/P-Si Junction Diode Fabricated Via Jns Pyrolysis Techniqu, K. Mohanraj, D. Balasubramanian, N. Jhansi, R. Bakkiyaraj, J. Chandrasekaran Sep 2021

Structural, Optical And Electrical Properties Of Green Synthesis Cdo Nanoparticles And Its Ag/Cdo/P-Si Junction Diode Fabricated Via Jns Pyrolysis Techniqu, K. Mohanraj, D. Balasubramanian, N. Jhansi, R. Bakkiyaraj, J. Chandrasekaran

International Journal of Thin Film Science and Technology

CdO nanoparticle is synthesized using green tea extract as solvent by microwave irradiation method. Its crystalline structure is confirmed by the well define peaks of powder XRD study. The surface morphology is analyzed by SEM and TEM spectrograph. The percentage composition of cadmium present in the synthesized material is confirmed by EDS study also presence of various functional groups is analysis using FTIR spectrum. The band gap energy of composed material is calculated with the help of cut off peak of diffused reflectance spectrum of UV study. The thermal conductance of the substance is increasing with increasing the temperature. The …

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The Growth Of Vapour Bubble Between Two-Phase Peristaltic Bubbly Flow Inside A Vertical Cylindrical Tube, S. A. Mohammadein, A. K. Abu-Nab Sep 2021

The Growth Of Vapour Bubble Between Two-Phase Peristaltic Bubbly Flow Inside A Vertical Cylindrical Tube, S. A. Mohammadein, A. K. Abu-Nab

International Journal of Thin Film Science and Technology

The behavior of vapour bubble in superheated liquid in a vertical cylindrical tube between two-phase flow densities is discussed under the effect of peristaltic motion of long wavelength and low Reynolds number. The mathematical model is formulated by mass, momentum, and heat equations. The problem solved analytically to estimate the growth of vapour bubbles, temperature and velocity distributions. The growth of vapour bubbles, temperature and velocity distribution proportional with the amplitude ratio, Grashof number, heat source parameter, volume rate, and inversely with density fraction. The present results of bubble growth performed lower values than that obtained by Mohammadein model (2001).

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Synthesis, Characterization And Aqueous Properties Of A Newly Prepared Lignin-Based Graft Copolymer As A Drilling Mud Additiv, Magdy A. Zahran, Ibrahim M. El-Sherbiny, Hany M. Abd El-Raheem, Moneer M. Basuni Sep 2021

Synthesis, Characterization And Aqueous Properties Of A Newly Prepared Lignin-Based Graft Copolymer As A Drilling Mud Additiv, Magdy A. Zahran, Ibrahim M. El-Sherbiny, Hany M. Abd El-Raheem, Moneer M. Basuni

International Journal of Thin Film Science and Technology

This study involves a free radical graft copolymerization of lignosulfonates (LS) with 2-propenamide (Am), propenoic acid (AA), and methylene-bis-acrylamide (MBAm) in the presence of hydrogen peroxide as the initiator to produce LS-g-p(AA-co-Am-co-MBAm) copolymer. The resulting copolymer was characterized by various techniques such as infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Viscosity measurements of the copolymer solution, pH values, solid content, gravimetric conversion and mud properties were determined. The effect of various experimental conditions on the characteristics of the developed copolymer was also investigated. Moreover, the performance of the resulting LS-g-p(AA-co-Am-co-MBAm copolymer as a pH controlling agent for water-base mud was …

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Structural, Morphological, Chemical And Optical Properties Of Porous Silicon Prepared By Electrochemical Etching, Raheem G. Kadhim, Raid A. Ismail, Wasnaa M. Abdulridha Sep 2021

Structural, Morphological, Chemical And Optical Properties Of Porous Silicon Prepared By Electrochemical Etching, Raheem G. Kadhim, Raid A. Ismail, Wasnaa M. Abdulridha

International Journal of Thin Film Science and Technology

In this paper, porous silicon layers was prepared from p-type silicon with orientation (100) by electrochemical etching method , samples were anodized in a solution of 48% HF and 99% C2H2OH at 1:1 ratio and study the morphology properties of PSi samples by changing etching time (15, 17 and 20) min for fixed (11.5 mA/ cm2) current density, and imaged PSi sample in Atomic force microscopy(AFM), which shows the rough silicon surface, with increasing etching process (etching time) porous structure nucleates which leads to an increase in the depth and width (diameter) of surface pits. Consequently, the surface roughness also …

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Sputter Based Epitaxial Growth And Modeling Of Cu/Si Thin Films, A. S. Bhattacharyya, S. Kumar, S. Jana, P. Y. Kommu, K.Gaurav, S. Prabha Sep 2021

Sputter Based Epitaxial Growth And Modeling Of Cu/Si Thin Films, A. S. Bhattacharyya, S. Kumar, S. Jana, P. Y. Kommu, K.Gaurav, S. Prabha

International Journal of Thin Film Science and Technology

Epitaxial copper thin films were deposited by magnetron sputtering. The adatoms during deposition are influenced by deposition parameters which cause variations in thin film properties. XRD and FESEM studies were done to get an insight into the growth mechanisms of the films. 3D island growth attributed to volmer Weber epitaxial growth followed by dewetting due to higher surface energy was observed. A modelling has been done on the epitaxial thin film growth with sputtering process. The parameters during sputtering like, sputtering yield, pressure, temperature, current density, deposition time were related and an attempt has been made to analyse the sputtering …

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Studies On Characterization Of Cadmium Sulphide Thin Films Deposited By Chemical Bath Deposition (Cbd) And Successive Ionic Layer Adsorption And Reaction (Silar) Method, Smt. Swapna Samanta, M. S. Shinde, R. S. Patil Sep 2021

Studies On Characterization Of Cadmium Sulphide Thin Films Deposited By Chemical Bath Deposition (Cbd) And Successive Ionic Layer Adsorption And Reaction (Silar) Method, Smt. Swapna Samanta, M. S. Shinde, R. S. Patil

International Journal of Thin Film Science and Technology

Cadmium Sulfide (CdS) were grown on glass substrate by chemical bath deposition (CBD) and Successive Ionic layer adsorption and reaction technique (SILAR) techniques. The structural, morphological and optical properties of the CBD deposited CdS thin films have been studied by varying the parameters such as concentration, pH and the deposition time. The ratio of S/Cd of the precursor was varied in order to have better understanding of the growth conditions. Similarly in SILAR method parameters such as concentration of cationic and ionic precursors, number of 125 immersion cycles, immersion time and pH of the solution were optimized. The films were …

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Effects Of Tritonx100 And Tetraethylorthosilicate On The Morphology And Photocatalyst Properties Of Tio2 Thin Film, Hamideh Samari Jahromi Sep 2021

Effects Of Tritonx100 And Tetraethylorthosilicate On The Morphology And Photocatalyst Properties Of Tio2 Thin Film, Hamideh Samari Jahromi

International Journal of Thin Film Science and Technology

The effects of non-ionic Triton X-100 (TX) surfactant and Tetraethylorthosilicate binder agent for preparing the TiO2 (TO) thin film were investigated. TO thin film was prepared using tetra chloride titanium as a precursor via an acid catalyzed sol-gel process. The morphology and surface structure of the films were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The structure and surface of films obtained by a dip-coating technique were found to depend strongly on the use and type of additive molecules added. The results show that, the film from titania sol without various additives molecules consists of agglomerated …

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In-Silico Analysis Of Protein Receptors Contributing To Sars- Cov-2 High Infectivity, Ismail Atia, Mohamed L Salem, Aya Elkholy, Wael Elmashad, Gomaa A. M. Ali Sep 2021

In-Silico Analysis Of Protein Receptors Contributing To Sars- Cov-2 High Infectivity, Ismail Atia, Mohamed L Salem, Aya Elkholy, Wael Elmashad, Gomaa A. M. Ali

Information Sciences Letters

SARS-CoV-2 attacked more than 120 million people and causing the death of more than two million worldwide. Because of the crucial role of ACE2 protein as an entry for SRS-COV2, we investigated the proteins sequence in seventy- three living species. Data analysis of protein sequences, ACE2 mRNA, expression analysis, and protein interaction for humans and other living species were obtained from databases. The phylogenetic tree was constructed using MEGA6. We found 95% or more similarity between the conserved protein domains between Homo sapiens and Felis catus, Pan troglodytes, Pan paniscus, and Equus caballus. These species could be expressed the protein …

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Dependency Measures For New Bivariate Models Based On Copula Function, Hiba Z. Muhammed, El-Sayed A. El-Sherpieny, Ehab M. Almetwally Sep 2021

Dependency Measures For New Bivariate Models Based On Copula Function, Hiba Z. Muhammed, El-Sayed A. El-Sherpieny, Ehab M. Almetwally

Information Sciences Letters

The first part of this paper reviews the properties of bivariate dependence measures as Spearman’s rho and Kendall’s tau under the different copula. The second part of this paper derives the bivariate inverted Topp-Leone (BITL) distribution based on Farlie- Gumbel-Morgenstern (FGM), Ali-Mikhail-Haq (AMH), Plackett, and Clayton copula. The reliability function obtained for bivariate ITL distributions based on copula. The maximum likelihood estimation method for the parameters of the four bivariate ITL distributions has been discussed. Asymptotic confidence intervals for the model parameters are also considered. To evaluate the performance of the models, a Monte Carlo simulation study is conducted to …

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A Three Species Ecological Model With Holling Type-Ii Functional Response, Srinivasarao Thota Sep 2021

A Three Species Ecological Model With Holling Type-Ii Functional Response, Srinivasarao Thota

Information Sciences Letters

This paper elucidates an ecological model of a three-space food chain consists of two competing species and a third species, which is supporting the first competing species in non-linear manner of Holling type-II functional response and ingests the second competitive species in linear style, within the limited resources. This model is constituted by a system of non-linear decoupled first order ordinary differential equations. By using perturbed method, we investigate the local stability nature of the system at each possible equilibrium point. Further, the numerical illustrations at suitable parametric values to the model are presented by observing the species survivalness in …

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Application Of Near Infrared Reflectance Spectroscopy (Nirs) For Macronutrients Analysis In Alfalfa (Medicago Sativa L.), A. Morón, D. Cozzolino Sep 2021

Application Of Near Infrared Reflectance Spectroscopy (Nirs) For Macronutrients Analysis In Alfalfa (Medicago Sativa L.), A. Morón, D. Cozzolino

IGC Proceedings (1977-2023)

Near infrared reflectance spectroscopy was used to assess the mineral composition of alfalfa (Medicago sativa L.) as a tool for nutritional diagnosis. One hundred and ninety four (n = 194) samples of alfalfa from different locations representing a wide range of soils were used. Samples were reflectance scanned in a NIRS 6500 (NIRSystems, USA) instrument. The coefficients of determination (R2) of the regression estimate of the concentration of nitrogen, calcium, phosphorus, potassium, magnesium and sulphur and the errors in cross validation (SECV) were 0.93 (SECV: 1.6), 0.95 (SECV: 1.3), 0.93 (SECV: 1.9), 0.88 (SECV: 2.8), 0.82 (SECV: …

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Phosphorus, Sulphur And Micronutrients On Grassland Improvement With White Clover (Trifolium Repens L.) On Basaltic Soils In Uruguay, A. Morón, D. F. Risso Sep 2021

Phosphorus, Sulphur And Micronutrients On Grassland Improvement With White Clover (Trifolium Repens L.) On Basaltic Soils In Uruguay, A. Morón, D. F. Risso

IGC Proceedings (1977-2023)

Grasslands improvement with legumes is a promising technology for increasing forage quality and productivity on basaltic soils, but requires the correction of nutrient deficiencies. Phosphorus is a key element, but usual techniques of soil analysis are not good predictors. An experimental work was conducted in the northern region of the country. Evaluating the response of an improvement with white clover to P. Citric Acid showed a good association between soil P status and legume behavior. In addition there was a positive trend in forage production, in relation to S application, even though this effect was only significant in legume yield …

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Effect Of Liquid Cattle Manure Application On The Botanical Composition Forage Dry Yield And Soil Chemical Characteristics In Mixed Pastures, J. K. Lee, W. H. Kim, D. E. Shin, S. Seo, G. J. Choi, E. S. Chung, G. J. Park Sep 2021

Effect Of Liquid Cattle Manure Application On The Botanical Composition Forage Dry Yield And Soil Chemical Characteristics In Mixed Pastures, J. K. Lee, W. H. Kim, D. E. Shin, S. Seo, G. J. Choi, E. S. Chung, G. J. Park

IGC Proceedings (1977-2023)

Many farmers apply liquid cattle manure on grassland, often in excess of crop N requirement, resulting in groundwater contamination. Our experiment was carried out to determine the effect of liquid cattle manure application on the botanical composition, forage dry yield and soil chemical characteristics in mixed pastures at the forage experimental field, National Livestock Research Institute, RDA, Korea. Five treatments consisting of no fertilizer, chemical fertilizer (210kg N/ ha), liquid cattle manure (40, 60 and 80 ton N/ ha) were arranged in a randomized complete block design with three replicates. No fertilizer treatment consistently had lower botanical composition rate of …

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Nutrient Dynamics And Inventory In Tropical Grassland Ecosystem In Southern India, K. Karunaichamy, Kailash Paliwal Sep 2021

Nutrient Dynamics And Inventory In Tropical Grassland Ecosystem In Southern India, K. Karunaichamy, Kailash Paliwal

IGC Proceedings (1977-2023)

The present study was to ascertain the distribution of calcium (Ca), magnesium (Mg) and sodium (Na) in the different plant components and in the soil top 30 cm at Kalikesam in Western Ghats region of southern India. Magnesium concentration increased in the order: dead shoots > belowground > litter > aboveground live. Sodium concentration in live shoots was maximum in February (0.51%) and minimum in August (0.05%). Annually 8.94 g/m2 Ca, 2.41g/ m2 Mg and 2.30g/ m2 Na was taken up by plants. The distribution of the three nutrients in plant/soil system indicated that the major portion of the nutrients …

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The Effect Of Fermented Saw-Dust Pig Manure On Forage Mineral Contents And Soil Fertility In Cheju Volcanic Ash Soil, M. C. Kim, T. G. Kim Sep 2021

The Effect Of Fermented Saw-Dust Pig Manure On Forage Mineral Contents And Soil Fertility In Cheju Volcanic Ash Soil, M. C. Kim, T. G. Kim

IGC Proceedings (1977-2023)

Studies were carried out to investigate the change of soil characteristics and pasture minerals as affected by fermented saw-dust pig manure(FSM) applied to mixed pasture of a brown volcanic ash soil during the period from October 1996 to October 1998. Pasture mixed with orchardgrass (Dactylis glomerata L.) and white clover (Trifolium repens L.) was treated with N 200kg/ha + P 300kg/ha +K 200kg/ha(T1), N 100kg/ha + 10 ton/ha FSM(T2), FSM 10 ton/ha(T3), 20ton/ha FSM(T4), 40ton/ha FSM(T5) or 80ton/ha FSM(T6). K and P contents of mixed pasture in the 3rd year after sowing increased significantly with increasing levels of …

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