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Articles 69301 - 69330 of 302422

Full-Text Articles in Physical Sciences and Mathematics

Delay Model Of Vehicles At Urban Road Drop-Off Area, Lifan Zhang, Pengpeng Jiao, Mingkai Si Sep 2020

Delay Model Of Vehicles At Urban Road Drop-Off Area, Lifan Zhang, Pengpeng Jiao, Mingkai Si

Journal of System Simulation

Abstract: A model for calculating the delay of the drop-off vehicles at urban road drop-off area is proposed. The traffic organization modes of the independent drop-off area and the road drop-off area are analysed. The “queue up to drop off” mode process is divided into two stages, a delay model of drop-off vehicle based on queuing theory and gap theory is established, and an optimization algorithm is presented. Taking the entrance section of Anzhen Hospital in Beijing as the test object, the model is tested by VISSIM simulation software and real survey data. The influence of drop-off rate and drop-off …

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Chapter 4 Report: Strings And Hexadecimals: Explained And Explored, Reed Kessler, Jeremy Evert Sep 2020

Chapter 4 Report: Strings And Hexadecimals: Explained And Explored, Reed Kessler, Jeremy Evert

Student Research

What I learned from doing all three of these problems is the use of string statements, along with a better understanding of hexadecimals and their uses.

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Simulation Analysis On Penetration To Aircraft Carrier Of Image Homing Rocket, Shidong Fang, Chen Dong, Quanli Ning, Zhang Jie, Li Yong Sep 2020

Simulation Analysis On Penetration To Aircraft Carrier Of Image Homing Rocket, Shidong Fang, Chen Dong, Quanli Ning, Zhang Jie, Li Yong

Journal of System Simulation

Abstract: The effect of image homing rocket projectile penetrating aircraft carrier is the important basis for its operation. According to the characteristics of projectile and aircraft carrier, the geometric equivalent model and simulation model are established, and the penetration process is simulated by LS-DYNA. Simulation results are verified by the failure form and penetration limit velocity, and show the correctness of the model. Using the established models, the penetration processes are simulated under the different conditions. The overall force on the projectile is analyzed according to the extreme acceleration value of projectile. Based on the analysis of some collected key …

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Vertical Flight Simulation Performance Analysis Based On Power Function Control Command, Zhongjun Qu, Zeyu Kang, Yongmei Cheng Sep 2020

Vertical Flight Simulation Performance Analysis Based On Power Function Control Command, Zhongjun Qu, Zeyu Kang, Yongmei Cheng

Journal of System Simulation

Abstract: Based on the fly height control method of modal direct switching, after the input of the control command, the control output may be oscillated or even diverged. The power function conforms to the variation law of the flight altitude command, and is used as the prototype function to derive the relationship between the given height, the current height and the vertical velocity. Using this transformation relationship as the input command of the vertical velocity control loop, a smooth control system is designed. The system does not require control modal switching and can achieve the flight altitude maintenance andflight altitude …

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Art Project By Odu Faculty Focuses On Sea Level Rise And Climate Change, Amy Matzke-Fawcett Sep 2020

Art Project By Odu Faculty Focuses On Sea Level Rise And Climate Change, Amy Matzke-Fawcett

News Items

No abstract provided.

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Trapping Conformational States Of A Flavin-Dependent N-Monooxygenase In Crystallo Reveals Protein And Flavin Dynamics, Ashley C. Campbell, Kyle M. Stiers, Julia S. Martin Del Campo, Ritcha Mehra-Chaudhary, Pablo Sobrado, John J. Tanner Sep 2020

Trapping Conformational States Of A Flavin-Dependent N-Monooxygenase In Crystallo Reveals Protein And Flavin Dynamics, Ashley C. Campbell, Kyle M. Stiers, Julia S. Martin Del Campo, Ritcha Mehra-Chaudhary, Pablo Sobrado, John J. Tanner

Chemistry Faculty Research & Creative Works

The siderophore biosynthetic enzyme A (SidA) ornithine hydroxylase from Aspergillus fumigatus is a fungal disease drug target involved in the production of hydroxamate-containing siderophores, which are used by the pathogen to sequester iron. SidA is an N-monooxygenase that catalyzes the NADPH-dependent hydroxylation of L-ornithine through a multistep oxidative mechanism, utilizing a C4a-hydroperoxyflavin intermediate. Here we present four new crystal structures of SidA in various redox and ligation states, including the first structure of oxidized SidA without NADP(H) or L-ornithine bound (resting state). The resting state structure reveals a new out active site conformation characterized by large rotations of the FAD …

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Sensitivity Enhancement Of Silicon-On-Insulator Multipath Ring Resonator Using Gold Nanodisk For Sensor Application, Gabriel Dicky, Shidqie Taufiqurrahman, Topik Teguh Estu, Yusuf Nur Wijayanto, Robeth Viktoria Manurung, Dadin Mahmudin, Isa Anshori, Pamungkas Daud Sep 2020

Sensitivity Enhancement Of Silicon-On-Insulator Multipath Ring Resonator Using Gold Nanodisk For Sensor Application, Gabriel Dicky, Shidqie Taufiqurrahman, Topik Teguh Estu, Yusuf Nur Wijayanto, Robeth Viktoria Manurung, Dadin Mahmudin, Isa Anshori, Pamungkas Daud

Makara Journal of Science

Currently, environmental degradation caused by heavy metals has become a serious concern of many countries. To monitor the concentration of heavy metals in the environment, an in-situ sensor that can measure in real time and has high quality, sensitivity, and flexibility is essential. We proposed a modified multipath ring resonator (MPRR) based on silicon-on-insulator technology with additional gold nanodisk (GND) on top of the ring to increase its sensitivity. To prove the effect of GND on the sensitivity of the modified MPRR, finite-difference time-domain simulations were conducted. Results showed that the average sensitivity of the modified MPRR was 675 nm/RIU, …

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Solid Waste Co-Conversion By Hydrothermal Treatment Using Natural Zeolite, Lalak Tarbiyatun Nasyin Maleiva, Chandra Wahyu Purnomo Sep 2020

Solid Waste Co-Conversion By Hydrothermal Treatment Using Natural Zeolite, Lalak Tarbiyatun Nasyin Maleiva, Chandra Wahyu Purnomo

Makara Journal of Science

Hydrothermal treatment is a thermal conversion technology for processing high-moisture-content solid waste to coal-like materials. In this research, mixtures of sawdust and polyethylene terephthalate (PET) waste were treated in a 2000 mL hydrothermal reactor to produce hydrochar and a liquid product. The effects of zeolite addition and temperature variations during the treatment on the product characteristics were investigated. During the treatment, the utilized temperatures were 180, 200, and 220 °C, and the zeolite contents in the mixture were 10 and 20 wt%; the temperature and zeolite content were varied, while the other processing parameters were fixed, i.e., a biomass-to-PET ratio …

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Key Deposition Parameters For Short-Type Zno Nanosheets Electrodeposited Under Galvanostatic Mode, Gerald Ensang Timuda, Dhimas Harjanto, Wahyu Bambang Widayatno Sep 2020

Key Deposition Parameters For Short-Type Zno Nanosheets Electrodeposited Under Galvanostatic Mode, Gerald Ensang Timuda, Dhimas Harjanto, Wahyu Bambang Widayatno

Makara Journal of Science

Studies on the deposition of ZnO nanosheets grown vertically and perpendicular to conductive substrates have been conducted to obtain tall-type nanosheets (approximately 15 µm in height). However, some applications require short-type nanosheets with a height of about 1µm or less. In this study, short-type ZnO nanosheets were electrodeposited on indium-doped tin oxide substrates under galvanostatic (constant current) mode for a short deposition time. Then, the key parameters to form nanosheet layers with a height in the micrometer order and with good coverage were evaluated. Deposition was performed at 1 mA/cm2 for 60 s. Ar gas was initially bubbled into …

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Water Quality Assessment In The Occurrence Of Acanthaster Spp. (Crown-Of-Thorns Starfish, Cots) On Coral Reefs In Menjangan Island, Bali, Indonesia, Novia Arinda Pradisty, Eghbert Elvan Ampou, Rizki Hanintyo Sep 2020

Water Quality Assessment In The Occurrence Of Acanthaster Spp. (Crown-Of-Thorns Starfish, Cots) On Coral Reefs In Menjangan Island, Bali, Indonesia, Novia Arinda Pradisty, Eghbert Elvan Ampou, Rizki Hanintyo

Makara Journal of Science

Aquatic stressors are known to cause biological impairment that can result in biodiversity loss in several Marine Protected Areas (MPA), including in Menjangan Island, West Bali National Park. The objectives of this study were to correlate the changes in water quality parameters with the biological effect of Crown-of-Thorns starfish (CoTS) population dynamics and to assess the most applicable parameters for continuous environmental monitoring. Field observations and surveys were conducted three times in 2017, during the wet season, dry season and season transition, in order to assess the effect of seasonal variability. Redundancy Analysis (RDA) was performed to determine the relationship …

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Removal Of Pb2+ And Cd2+ From Aqueous Solutions Using Pocl3 Cross-Linked Carboxymethyl Derivatives Of Legume Starch, Ayodele Akinterinwa, Ebun Oladele, Albert Adebayo, Olubode Ajayi Sep 2020

Removal Of Pb2+ And Cd2+ From Aqueous Solutions Using Pocl3 Cross-Linked Carboxymethyl Derivatives Of Legume Starch, Ayodele Akinterinwa, Ebun Oladele, Albert Adebayo, Olubode Ajayi

Makara Journal of Science

Starch was extracted from Kwakil beans and cross-linked with POCl3 (1% v/w of starch dry basis [db]). The cross-linked starch (PCS) derivative was carboxymethylated with sodium monochloroacetate (5% to 30% w/w of starch db) to obtain cross-linked carboxymethyl starch (PCCS) derivatives. The derivatives were used in the adsorption of Pb2+ and Cd2+, and the process was monitored using atomic adsorption spectrometer. Carboxymethylation enhanced adsorption of ions (Cd2+, 95% to 96%; Pb, 65% to 94%), and it was more appreciable with Pb2+ than Cd2+ as degree of substitution increased from 0.008 to 0.052. …

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Malonic Acid As A Green And Efficient Catalyst For The Mass-Scale Synthesis Of Pyrrole Medicinal Drugs, Farzaneh Mohamadpour Sep 2020

Malonic Acid As A Green And Efficient Catalyst For The Mass-Scale Synthesis Of Pyrrole Medicinal Drugs, Farzaneh Mohamadpour

Makara Journal of Science

A green and naturally biodegradable malonic acid synthesis of highly substituted dihydro-2-oxopyrrole derivatives has been accomplished via one-pot four-condensation of amines (aromatic or aliphatic), dialkyl acetylenedicarboxylate, and formaldehyde under mild reaction conditions. The notable advantages of the present procedure are a green, low cost, and efficient catalyst; operational simplicity; no need for chromatographic purification steps; short reaction times; and good to high yields.

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Hepatitis B Surface Antigen And Viral Dna Detection And Prevalence In Nige-Ria, Abazuh Uchenna Desmond, Ohiengbomwan Onaiwu Tola, Adeolu Isaac, Yusuf Mercy Sep 2020

Hepatitis B Surface Antigen And Viral Dna Detection And Prevalence In Nige-Ria, Abazuh Uchenna Desmond, Ohiengbomwan Onaiwu Tola, Adeolu Isaac, Yusuf Mercy

Makara Journal of Science

Hepatitis B infection is a major public health issue with a high mortality rate. It is caused by hepatitis B virus (HBV), a small incomplete hepadnavirus with several open reading frames (ORF). High mutation rates of the HBV ORFs due to the virus’ replicating strategy are associated with the development and emergence of mutant strains, which may result in occult infections that are undetectable by conventional diagnostic assays. In this study, we first investigated the presence and prevalence of hepatitis B surface antigen (HBsAg) and HBV DNA among 204 patients visiting the specialist hospital in Osogbo, Nigeria, by using the …

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Instability Of Glucocorticoid Metabolites In Coyote Scats: Implications For Field Sampling, Erika T. Stevenson, Eric M. Gese, Lorin A. Neuman-Lee, Susannah S. French Sep 2020

Instability Of Glucocorticoid Metabolites In Coyote Scats: Implications For Field Sampling, Erika T. Stevenson, Eric M. Gese, Lorin A. Neuman-Lee, Susannah S. French

Human–Wildlife Interactions

Studying physiologic stress responses can assist in understanding the welfare of animals. One method of measuring the physiologic stress response is evaluating concentrations of glucocorticoid metabolites in feces. Previously, using an adrenocorticotropic hormone challenge, we found fecal glucocorticoid metabolite levels were a reliable indicator of physiologic stress response in coyotes (Canis latrans). We determine whether glucocorticoid metabolite concentrations remain stable when collecting feces over a 2-week period, a timeframe commonly used in scat surveys for wild canids. We collected feces from 6 captive coyotes maintained at the U.S. Department of Agriculture, Wildlife Services, National Wildlife Research Center, Predator …

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Review On Agv Scheduling Optimization, Jianlin Fu, Hengzhi Zhang, Zhang Jian, Liangkui Jiang Sep 2020

Review On Agv Scheduling Optimization, Jianlin Fu, Hengzhi Zhang, Zhang Jian, Liangkui Jiang

Journal of System Simulation

Abstract: AGV scheduling plays an important role in improving the efficiency and reducing manufacturing cost, but it is also a very complex combinatorial optimization procedure. AGV scheduling optimization is divided into three types, AGV static scheduling, AGV dynamic scheduling and AGV simultaneous scheduling with other resources scheduling. Various methods are summarized and listed, including traditional analysis method, modeling and simulation method, intelligent optimization algorithm and hybrid optimization method, and the advantages and disadvantages of each method are also analyzed. The deficiencies of AGV scheduling research are pointed out and the research directions for future are presented.

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Research On A Novel Biogeography-Based Optimization Algorithm Based On Ga, Wang Ning, Lisheng Wei Sep 2020

Research On A Novel Biogeography-Based Optimization Algorithm Based On Ga, Wang Ning, Lisheng Wei

Journal of System Simulation

Abstract: In order to further improve the optimization ability of biogeography-based optimization algorithm, a new genetic algorithm is proposed. The selection operation is added before the migration operation, and the migration individual is selected by the method of "roulette", so that the individuals with higher fitness can be preferentially migrated. The mutation operation combines the genetic gaussian mutation method, and the optimization performance of the algorithm is improved. The convergence condition of the method is derived in theory. Five test functions are used in the experiments, and the results prove that the ameliorated algorithm is better at the results of …

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Bacterial Foraging Algorithm With Gravitational Mechanism, Yitao He, Li Jun, Liyan Hao Sep 2020

Bacterial Foraging Algorithm With Gravitational Mechanism, Yitao He, Li Jun, Liyan Hao

Journal of System Simulation

Abstract: Aiming at the weak quorum sensing ability and slow convergence in bacterial foraging algorithm, an algorithm with gravitational mechanism is proposed. The algorithm provides an optimization direction for each bacterium by introducing a gravitational mechanism in the gravitational search algorithm. The original swimming operation of bacterial foraging algorithm is used to realize the local optimization strategy, and the local dimension update is added after the swimming to widen the bacterial search scope in chemotaxis operation. In the migration operation of the bacterial foraging algorithm, the bimodal Gaussian function is introduced to re-initialize the position of the bacteria to avoid …

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Simulation On Vehicles Mandatory Lane Changing And Merging Process In Case Of Road Bottleneck, Lü Wei, Feizhou Huo Sep 2020

Simulation On Vehicles Mandatory Lane Changing And Merging Process In Case Of Road Bottleneck, Lü Wei, Feizhou Huo

Journal of System Simulation

Abstract: A microscopic dynamic traffic flow model based on vehicle's mandatory lane changing behavior is established. Under the condition of road bottleneck, three macroscopic traffic flow characteristics of traffic flow, lane speed distribution and space-time diagram, and two microscopic traffic flow characteristics of merging distance and vehicle's travel time are analyzed. The simulation results show that, the total flow of arbitrary cross section of the bottleneck road can represent the overall traffic capacity, and the road bottleneck can reduce the total traffic flow by 10% to 35%, and cause a delay of 17% to 42% to the vehicle travel time …

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The Use Of Criteria And Indicator Monitoring Of Ecosystem Sustainability To Assess Ecosystem Services On Grasslands/Rangelands, R. Dennis Child, Janette Kaiser, Ralph Crawford Sep 2020

The Use Of Criteria And Indicator Monitoring Of Ecosystem Sustainability To Assess Ecosystem Services On Grasslands/Rangelands, R. Dennis Child, Janette Kaiser, Ralph Crawford

IGC Proceedings (1993-2023)

No abstract provided.

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Applicability Of Criteria And Indicators For Sustainable Grassland Management To Rangelands Of Patagonia (Argentina), Gabriel E. Oliva, Andrés F. Cibils Sep 2020

Applicability Of Criteria And Indicators For Sustainable Grassland Management To Rangelands Of Patagonia (Argentina), Gabriel E. Oliva, Andrés F. Cibils

IGC Proceedings (1993-2023)

No abstract provided.

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Indicators Of Sustainability In African Ranglands, Walter J. Lusigi, Leornad Berry Sep 2020

Indicators Of Sustainability In African Ranglands, Walter J. Lusigi, Leornad Berry

IGC Proceedings (1993-2023)

No abstract provided.

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Effect Of Oxidation Level On The Interfacial Water At The Graphene Oxide-Water Interface: From Spectroscopic Signatures To Hydrogen-Bonding Environment, Rolf David, Aashish Tuladhar, Le Zhang, Christopher Arges, Revati Kumar Sep 2020

Effect Of Oxidation Level On The Interfacial Water At The Graphene Oxide-Water Interface: From Spectroscopic Signatures To Hydrogen-Bonding Environment, Rolf David, Aashish Tuladhar, Le Zhang, Christopher Arges, Revati Kumar

Faculty Publications

The interfacial region of the graphene oxide (GO)-water system is nonhomogenous due to the presence of two distinct domains: an oxygen-rich surface and a graphene-like region. The experimental vibrational sum-frequency generation (vSFG) spectra are distinctly different for the fully oxidized GO-water interface as compared to the reduced GO-water case. Computational investigations using ab initio molecular dynamics were performed to determine the molecular origins of the different spectroscopic features. The simulations were first validated by comparing the simulated vSFG spectra to those from the experiment, and the contributions to the spectra from different hydrogen bonding environments and interfacial water orientations were …

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Concomitant Of Order Statistics From New Bivariate Gompertz Distribution, Sumit Kumar, M. J. S. Khan, Surinder Kumar Sep 2020

Concomitant Of Order Statistics From New Bivariate Gompertz Distribution, Sumit Kumar, M. J. S. Khan, Surinder Kumar

Journal of Modern Applied Statistical Methods

For the new bivariate Gompertz distribution, the expression for probability density function (pdf) of rth order statistics and pdf of concomitant arising from rth order statistics are derived. The properties of concomitant arising from the corresponding order statistics are used to derive these results. The exact expression for moment generating function (mgf) of concomitant of order rth statistics is derived. Also, the mean of concomitant arising from rth order statistics is computed using the mgf of concomitant of rth order statistics, and the exact expression for joint density of concomitant of two non-adjacent order statistics …

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Toward A Sustainable Cybersecurity Ecosystem, Shahrin Sadik, Mohiuddin Ahmed, Leslie F. Sikos, A.K.M. Najmul Islam Sep 2020

Toward A Sustainable Cybersecurity Ecosystem, Shahrin Sadik, Mohiuddin Ahmed, Leslie F. Sikos, A.K.M. Najmul Islam

Research outputs 2014 to 2021

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. Cybersecurity issues constitute a key concern of today’s technology-based economies. Cybersecurity has become a core need for providing a sustainable and safe society to online users in cyberspace. Considering the rapid increase of technological implementations, it has turned into a global necessity in the attempt to adapt security countermeasures, whether direct or indirect, and prevent systems from cyberthreats. Identifying, characterizing, and classifying such threats and their sources is required for a sustainable cyber-ecosystem. This paper focuses on the cybersecurity of smart grids and the emerging trends such as using blockchain in …

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Pressure-Stabilized Divalent Ozonide Cao3 And Its Impact On Earth’S Oxygen Cycles, Yanchao Wang, Meiling Xu, Liuxiang Yang, Bingmin Yan, Qin Qin, Xuecheng Shao, Yunwei Zhang, Dajian Huang, Xiaohuan Lin, Jian Lv, Dongzhou Zhang, Huiyang Gou, Ho-Kwang Mao, Changfeng Chen, Yanming Ma Sep 2020

Pressure-Stabilized Divalent Ozonide Cao3 And Its Impact On Earth’S Oxygen Cycles, Yanchao Wang, Meiling Xu, Liuxiang Yang, Bingmin Yan, Qin Qin, Xuecheng Shao, Yunwei Zhang, Dajian Huang, Xiaohuan Lin, Jian Lv, Dongzhou Zhang, Huiyang Gou, Ho-Kwang Mao, Changfeng Chen, Yanming Ma

Physics & Astronomy Faculty Research

High pressure can drastically alter chemical bonding and produce exotic compounds that defy conventional wisdom. Especially significant are compounds pertaining to oxygen cycles inside Earth, which hold key to understanding major geological events that impact the environment essential to life on Earth. Here we report the discovery of pressure-stabilized divalent ozonide CaO3 crystal that exhibits intriguing bonding and oxidation states with profound geological implications. Our computational study identifies a crystalline phase of CaO3 by reaction of CaO and O2 at high pressure and high temperature conditions; ensuing experiments synthesize this rare compound under compression in a diamond anvil cell with …

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A Review Of The Preclinical And Clinical Efficacy Of Remdesivir, Hydroxychloroquine, And Lopinavir-Ritonavir Treatments Against Covid-19, Dawid Maciorowski, Samir Z. El Idrissi, Yash Gupta, Brian J. Medernach, Michael B. Burns, Daniel P. Becker Ph.D., Ravi Durvasula, Prakasha Kempaiah Sep 2020

A Review Of The Preclinical And Clinical Efficacy Of Remdesivir, Hydroxychloroquine, And Lopinavir-Ritonavir Treatments Against Covid-19, Dawid Maciorowski, Samir Z. El Idrissi, Yash Gupta, Brian J. Medernach, Michael B. Burns, Daniel P. Becker Ph.D., Ravi Durvasula, Prakasha Kempaiah

Chemistry: Faculty Publications and Other Works

In December of 2019, an outbreak of a novel coronavirus flared in Wuhan, the capital city of the Hubei Province, China. The pathogen has been identified as a novel enveloped RNA beta-coronavirus named severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The virus SARS-CoV-2 is associated with a disease characterized by severe atypical pneumonia known as coronavirus 2019 (COVID-19). Typical symptoms of this disease include cough, fever, malaise, shortness of breath, gastrointestinal symptoms, anosmia, and, in severe cases, pneumonia.1 The high-risk group of COVID-19 patients includes people over the age of 60 years as well as people with existing cardiovascular …

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Experiences With Grazing The New Annual Pasture Legume Biserrula Pelecinus L. In Southern Australia Production Benefits And Risk Of Photosensitisation, Clinton K. Revell, N. Robertson, I. Williams Sep 2020

Experiences With Grazing The New Annual Pasture Legume Biserrula Pelecinus L. In Southern Australia Production Benefits And Risk Of Photosensitisation, Clinton K. Revell, N. Robertson, I. Williams

IGC Proceedings (1993-2023)

No abstract provided.

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Grazing Impacts On The Dynamics Of Two Long Lived Perennial Grasses In Tropical Australia, David M. Orr, Peter J. O'Reagain Sep 2020

Grazing Impacts On The Dynamics Of Two Long Lived Perennial Grasses In Tropical Australia, David M. Orr, Peter J. O'Reagain

IGC Proceedings (1993-2023)

No abstract provided.

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Testing Non‐Equilibrium Theory: Effects Of Grazing On Plant Community Composition And Soil Nutrient Availability In Dry Southern Mongolian Steppes, Karsten Wesche, Katrin Ronnenberg Sep 2020

Testing Non‐Equilibrium Theory: Effects Of Grazing On Plant Community Composition And Soil Nutrient Availability In Dry Southern Mongolian Steppes, Karsten Wesche, Katrin Ronnenberg

IGC Proceedings (1993-2023)

No abstract provided.

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The Use Of Faecal Nirs To Monitor Diet Quality Different Grazing Systems In Tropical Savannas, Andrew I. White, L. P. Hunt, S. R. Petty, Dennis P. Poppi Sep 2020

The Use Of Faecal Nirs To Monitor Diet Quality Different Grazing Systems In Tropical Savannas, Andrew I. White, L. P. Hunt, S. R. Petty, Dennis P. Poppi

IGC Proceedings (1993-2023)

No abstract provided.

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