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Temperature Dependence Of Gas X-Ray Detectors Onboard The 6u Cubesat X-Ray Observatory Ninjasat., Amira Aoyama, T. Tamagawa, T. Enoto, T. Kitaguchi, Y. Kato, T. Mihara, W. Iwakiri, M. Numazawa, Y. Zhou, K. Uchiyama, T. Takeda, Y. Yoshida, N. Ota, S. Hayashi, S. Watanabe, A. Jujo, S. Iwata, H. Sato, C. Hu, H. Takahashi, H. Odaka, T. Tamba, K. Taniguchi Aug 2024

Temperature Dependence Of Gas X-Ray Detectors Onboard The 6u Cubesat X-Ray Observatory Ninjasat., Amira Aoyama, T. Tamagawa, T. Enoto, T. Kitaguchi, Y. Kato, T. Mihara, W. Iwakiri, M. Numazawa, Y. Zhou, K. Uchiyama, T. Takeda, Y. Yoshida, N. Ota, S. Hayashi, S. Watanabe, A. Jujo, S. Iwata, H. Sato, C. Hu, H. Takahashi, H. Odaka, T. Tamba, K. Taniguchi

Small Satellite Conference

We report the temperature dependence of Gas Multiplier Counters (GMCs) onboard the 6U CubeSat X-ray observatory NinjaSat.The detector performance of GMC depends on the temperature. The temperature dependence of the gain was calibrated for the detector response function in orbit using data from the Crab Nebula. The fit results using the function created improved the ratio of the fit curve to the data from 12% to 4% before and after gain correction.

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Harnessing Cubesat Technology For Precision Pesticide Management In Egyptian Agriculture, Motaz El Sayed, Salem Abdou, Abdelhamid Sherif Aug 2024

Harnessing Cubesat Technology For Precision Pesticide Management In Egyptian Agriculture, Motaz El Sayed, Salem Abdou, Abdelhamid Sherif

Small Satellite Conference

This paper presents the development of an autonomous spraying robot designed to optimize agricultural practices through precise pesticide application, facilitated by the integration of real-time satellite data. The robot utilizes multispectral imaging from satellites, including NDVI and thermal data, to assess crop health and identify specific needs for intervention. The system aims to significantly reduce the volume of chemicals used in farming by targeting only the areas that require treatment, thus minimizing environmental impact while maintaining or enhancing crop yield. By employing advanced algorithms for data processing and machine operation, the robot autonomously navigates through fields, delivering pesticides in an …

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The Cosmic X-Ray Background Nanosatellite 3 (Cxbn-3): Toward An Improved Understanding Of Diffuse Emission Produced By High-Redshift Active Galactic Nuclei, Breno Mascarenhas Pontes, Brannon Jones, Thomas Pannuti, Jaden Yates, Benjamin Malphrus Aug 2024

The Cosmic X-Ray Background Nanosatellite 3 (Cxbn-3): Toward An Improved Understanding Of Diffuse Emission Produced By High-Redshift Active Galactic Nuclei, Breno Mascarenhas Pontes, Brannon Jones, Thomas Pannuti, Jaden Yates, Benjamin Malphrus

Small Satellite Conference

The Cosmic X-ray Background (CXB) is the diffuse emission of hard X-rays (3-300 keV) that is observed across the whole sky. The general consensus for the sources of the CXB (particularly at higher energies) are heavily obscured active galactic nuclei (AGN) located at a moderate redshift (z ≈ 1). To explore the properties of the CXB further (such as whether flux variations are present at different angular scales), the Space Science Center (SSC) at Morehead State University (MSU) is developing CXBN-3 (Cosmic X-ray Background Nanosatellite 3), a nanosatellite designed to measure the intensity of the CXB within the energy …

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Printed Circuit Board Reaction Wheels For Small Satellites, Saral Tayal, Paulo Fisch, Zachary Manchester Aug 2024

Printed Circuit Board Reaction Wheels For Small Satellites, Saral Tayal, Paulo Fisch, Zachary Manchester

Small Satellite Conference

Reaction wheels are critical for spacecraft attitude control, enabling precise pointing. However, conventional designs are bulky and expensive, limiting their application in CubeSats and PocketQubes. This paper introduces a novel PCB motor architecture specifically designed for reaction wheels in small satellites. Our design integrates motor windings as traces on the PCB and utilizes a dual-purpose rotor-flywheel combination, resulting in a volumetrically efficient configuration. Additionally, the reaction wheel’s PCB casing enables multifunctional capabilities, such as serving as the satellite’s structural elements or solar panels. The accessibility of PCB manufacturing offers a simplified and cost-effective production process, with each reaction wheel costing …

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Contentcube: A 1u Cubesat To Test Display Screens In Space, Joseph Esser, Jason Jagoda, Steffen Winther, Timothy Mcevoy, Tejas Vinod, Larsen Vanofferen, Dylan Cooper, Kevin Schroeder Aug 2024

Contentcube: A 1u Cubesat To Test Display Screens In Space, Joseph Esser, Jason Jagoda, Steffen Winther, Timothy Mcevoy, Tejas Vinod, Larsen Vanofferen, Dylan Cooper, Kevin Schroeder

Small Satellite Conference

ContentCube is a novel 1U CubeSat developed by inspireFly at Virginia Polytechnic and State University, in collaboration with Bronco Space at Cal Poly Pomona. The mission of ContentCube is to test the performance of the Adafruit breakout board OLED screen in orbit. This mission could pave the way for using display screens in the space environment. Such applications could include astronauts having displays on their suits that they can use to monitor critical information, or robotic systems having complex digital displays. The external display screen will be tested through a novel payload designed and tested at Virginia Tech. This payload …

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Evaluation Of Spectral Cnnjpeg Adaptive Compression On The Stp-H7-Caspr Platform, Diego Wildenstein, Tyler Garrett, Evan Gretok, Seth Roffe, Alan D. George Aug 2024

Evaluation Of Spectral Cnnjpeg Adaptive Compression On The Stp-H7-Caspr Platform, Diego Wildenstein, Tyler Garrett, Evan Gretok, Seth Roffe, Alan D. George

Small Satellite Conference

Many space-sensing platforms are capable of producing vast amounts of sensor data. While having additional data can further science goals, it also introduces the problems of storage and transfer. Space platforms have limited storage resources and transmission bandwidth. As such, data compression is a vital step to make the most efficient use of onboard resources. Sensors such as multispectral imagers can capture many times the amount of data of traditional visual sensors, posing difficulties for onboard storage and processing of the data. Spectral CNNJPEG is a state-of-the-art adaptive compression algorithm for multispectral and hyperspectral-imaging sensors. This algorithm has been previously …

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Propulsion System Design And Sensitivity Analysis Of Sub 10cm Debris Detection Cubesat Mission, Mirza Talha Baig, Nicholas Crisp, Despina Ioannide Aug 2024

Propulsion System Design And Sensitivity Analysis Of Sub 10cm Debris Detection Cubesat Mission, Mirza Talha Baig, Nicholas Crisp, Despina Ioannide

Small Satellite Conference

Low Earth Orbit (LEO) satellites which are significant to global communication networks, face escalating collision risks from debris smaller than 10 cm. This risk has significantly increased by expanding satellite constellations like Starlink. Bob Sat is a small satellite(cube sat) conceptual design for detecting sub 10 cm debris for which a concept tradeoff was used to choose concept 1. This research introduces the propulsion system design for Bob Sat equipped with 36 JRT laser sensors for enhanced debris detection, crucial for collision avoidance. We detail a strategic mission plan deploying the satellite in circular orbits at various altitudes ranging from …

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Preliminary Design Of A 3d Printing System For Creating Infinitely Large Structures In Space, Stephen Timperley, Grant Stec, Daniel Miller Aug 2024

Preliminary Design Of A 3d Printing System For Creating Infinitely Large Structures In Space, Stephen Timperley, Grant Stec, Daniel Miller

Small Satellite Conference

As interest in the space environment grows, the demand for larger and more capable space systems will follow. A possible solution to fill this demand is additive manufacturing in the form of 3D printing. This paper showcases a working preliminary system to 3D print large structures in space from a small satellite. This is achieved by replacing the normal Z axis control of a conventional CoreXY fused deposition modeling (FDM) 3D printer with a system to move along an infinitely extendable printed track. Having the ability to print and then move along this track creates a cycle of printing and …

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A Hardware-In-The-Loop Star Tracker Testbed, Ashley Haraguchi Aug 2024

A Hardware-In-The-Loop Star Tracker Testbed, Ashley Haraguchi

Small Satellite Conference

As the use of small satellites for advanced space missions continues to grow, the importance of low mass and cost three axis attitude stabilization systems is increasing as well, which means high accuracy attitude knowledge is required. Star trackers provide the most accurate attitude knowledge of any type of attitude sensor, but their high cost, size, and weight can be prohibitive to small satellite missions. Many simple star trackers have been developed using commercial-off-the-shelf camera sensors and processing hardware, but the challenge remains in testing and characterizing these devices. Common methods involve night sky tests, where the star tracker is …

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Aerodynamic Satellite Attitude Control In Very Low Earth Orbit, Cheng Chang, Robert Breidenthal, Bo-Chuan Lin, Ya-Xun Yang Aug 2024

Aerodynamic Satellite Attitude Control In Very Low Earth Orbit, Cheng Chang, Robert Breidenthal, Bo-Chuan Lin, Ya-Xun Yang

Small Satellite Conference

Simulation of a 3U-sized standard platform with four control panels attached to the rear part of the satellite at an altitude of 300 km was performed in Simulink to verify the feasibility of the aerodynamic control. The entire controller is composed of three loops: one outer loop and two inner loops. The outer loop is based on the robust and tested quaternion error feedback regulator to provide the target torque input for the two inner loops. The inner loops are responsible for actuating the control panels, using the square-root-based PI controller and a dedicated designed Panel Selecting Method (PSM) to …

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Lunar High Quality Terrain Scanning Mission Using Lidar Technology, Mohammed Muqahhis, Mohammed Al Qahtani, Ziyad Al Shamrani, Abrar-Ul-Haq Baluch Aug 2024

Lunar High Quality Terrain Scanning Mission Using Lidar Technology, Mohammed Muqahhis, Mohammed Al Qahtani, Ziyad Al Shamrani, Abrar-Ul-Haq Baluch

Small Satellite Conference

As interest in exploring the moon grows, this study suggests a mission plan that involves using a CubeSat fitted with a LiDAR sensor (SALi) to survey large sections of the lunar landscape and gather precise information on its ruggedness and altitude. By making use of available components and an advanced Guidance, Navigation and Control (GNC) system featuring star trackers, IMUs and maintaining a circular polar orbit at 125 km above the moon’s surface the CubeSat will implement the Lambert Method for efficient orbital insertion around the moon and employ reaction wheels along with ion thrusters for accurate imaging. Communication will …

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Development Of Testing And Verification Procedures For Memesat-1'S Subsystems, Jillian Russell, Deepak Mishra Aug 2024

Development Of Testing And Verification Procedures For Memesat-1'S Subsystems, Jillian Russell, Deepak Mishra

Small Satellite Conference

MEMESat-1 is a 2U repeater crafted by the UGA Small Satellite Research Lab. It's geared towards inspiring the next generation of students to work in aerospace. MEMESat-1 is entering the stage of testing our satellite to ensure it will be prepared for its mission. These tests will be the respnsibility of MEMESat-1's Mission Operations team. MOPs will employ a series of ground tests to validate the satellite's subsystems, including its flight software via the DitL testing, communication via the Simulated Communication testing, power supply via the Charge Cycle testing, ADCS via the ADCS Verification testing, and command system via the …

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Commissioning Plans For The Pandora Smallsat: A Mission To Quantify Stellar Contamination Of Exoplanet Transmission Spectra, Lindsey Wiser, Jessie Dotson, Thomas Greene, Thomas Barclay, Knicole Colon, Christina Hedges, Ben Hord, Aishwarya Iyer, Elisa Quintana, Rae Holcomb, Trevor Foote, Jordan Karburn Aug 2024

Commissioning Plans For The Pandora Smallsat: A Mission To Quantify Stellar Contamination Of Exoplanet Transmission Spectra, Lindsey Wiser, Jessie Dotson, Thomas Greene, Thomas Barclay, Knicole Colon, Christina Hedges, Ben Hord, Aishwarya Iyer, Elisa Quintana, Rae Holcomb, Trevor Foote, Jordan Karburn

Small Satellite Conference

Pandora is a SmallSat mission designed to observe exoplanet atmospheres and stellar activity. Funded by the NASA Science Mission Directorate (SMD) Astrophysics Division through the Pioneers program, Pandora is a collaboration between NASA centers Goddard and Ames, the Lawrence Livermore National Laboratory, the University of Arizona, and other scientific institutions. Pandora will survey at least 20 transiting exoplanets during one year of science operations, obtaining a long baseline of simultaneous visible-light photometric and near-IR spectroscopic observations. These observations will be used to quantify and correct for stellar contamination of exoplanet transmission spectra due to spots and faculae on host stars. …

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Performance Analysis Of A Pointing, Acquisition, And Tracking System For The Vision Laser Crosslink Mission, Yeji Kim, Pureum Kim, Han-Gyeol Ryu, Sang-Young Park Aug 2024

Performance Analysis Of A Pointing, Acquisition, And Tracking System For The Vision Laser Crosslink Mission, Yeji Kim, Pureum Kim, Han-Gyeol Ryu, Sang-Young Park

Small Satellite Conference

As the volume of space-borne data increases, laser communication techniques are being considered to achieve a fast transmission rate and high link security or privacy. The very-high-speed intersatellite link system using an infrared optical terminal and nanosatellite (VISION) mission comprises two 6U formation-flying nanosatellites, and its main objective is to achieve a Gbps-level inter-satellite data-transfer capacity by applying laser communication technology in free space. A pointing, acquisition, and tracking (PAT) system is required to establish and maintain a stable laser crosslink. In the CubeSat platform, the PAT system relies on a satellite attitude determination and control system (ADCS) for body …

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Medical Assistants Adherence To The Jnc-8 Guidelines In A Primary Care Clinic, Mary Jacob Aug 2024

Medical Assistants Adherence To The Jnc-8 Guidelines In A Primary Care Clinic, Mary Jacob

Doctor of Nursing Practice Projects

Hypertension (HTN) is currently one of the most common diseases that is underdiagnosed and under-treated in the primary care setting. The identified gap in practice is that medical assistants need to gain knowledge of the current JNC-8 HTN guidelines and, therefore, do not apply the JNC-8 guidelines to patient management. This project aimed to educate medical assistants in a primary care clinic on the Joint National Committee 8 (JNC-8) guidelines to improve their HTN management knowledge over four weeks. The social cognitive theory and Kurt Lewin’s change management theory guided the project. The project adopted a quantitative, quasi-experimental design whereby …

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Comparing The Performance Of Different Missing Data Imputation Approaches In Discrete Outcome Modeling, Md Istiak Jahan, Tanmoy Bhowmik, Lauren Hoover, Naveen Eluru Aug 2024

Comparing The Performance Of Different Missing Data Imputation Approaches In Discrete Outcome Modeling, Md Istiak Jahan, Tanmoy Bhowmik, Lauren Hoover, Naveen Eluru

Civil and Environmental Engineering Faculty Publications and Presentations

Although several approaches exist for data imputation, these approaches are not commonly applied in transportation. The current paper is geared toward assisting transportation researchers and practitioners in developing models using datasets with missing data. The study begins with a data simulation exercise evaluating different solutions implemented for missing data. The dimensions considered in our analysis include: the nature of independent variables, different types of missing variables, different shares of missing values, multiple data sample sizes, and evaluation of single imputation (SI), multiple imputation (MI) and complete case data (CCD) approach. The comparison is conducted by adopting the appropriate inference process …

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Radiating Excellence: Leadership Styles In Nuclear Power That Influence Operators Towards Industry Best Practices, Joshua Copeland Aug 2024

Radiating Excellence: Leadership Styles In Nuclear Power That Influence Operators Towards Industry Best Practices, Joshua Copeland

Dissertations

Poor leadership is the root cause for the three most significant accidents in the nuclear industry. The purpose of this research was to determine the best leadership characteristics of operating supervisors at nuclear plants that could help prevent future accidents from happening. Operating supervisors are the leaders that have the greatest impact on how safe the nuclear plant is operating. A mixed method approach was used, where the quantitative study surveyed 77 supervisors about their leadership style and how well they influence standards adherence, and the qualitative study interviewed 11 subordinates of supervisors to determine how supervision helps them follow …

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Sales Professional Preservation: Examining The Impact Of Incongruent Ideological Belief Systems On Intentions To Quit Among Sales Professionals, Brian Lee Morgan Aug 2024

Sales Professional Preservation: Examining The Impact Of Incongruent Ideological Belief Systems On Intentions To Quit Among Sales Professionals, Brian Lee Morgan

Dissertations

Organizations that lead with ideologies of moral tradition, politics, and social economics are playing a losing game. The ideological belief system congruence within the organization between leaders and members creates a better atmosphere with less turnover and better recruitment. Sales professionals want an environment free of ideological incongruence. Without ideological alignment, they will defect from the organization. Leaders are miscalculating the negative impact on members’ intentions to quit when they are faced with leaders acting upon ideology changes that affect the member-customer ecosystem. In addition, leaders should be aware of the personal attributes that can exacerbate turnover and work to …

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Testing Metabolic Cold Adaptation And The Climatic Variability Hypothesis In Two Latitudinally Distant Populations Of A Supratidal Water Beetle, J.M. Miron-Gaton, J. Velasco, S. Pallares, A.J. García-Meseguer, A. Millan, David T. Bilton Aug 2024

Testing Metabolic Cold Adaptation And The Climatic Variability Hypothesis In Two Latitudinally Distant Populations Of A Supratidal Water Beetle, J.M. Miron-Gaton, J. Velasco, S. Pallares, A.J. García-Meseguer, A. Millan, David T. Bilton

School of Biological and Marine Sciences

Temperature significantly impacts ectotherm physiology, with thermal tolerance and metabolic traits typically varying with latitude across species ranges. The drivers of this variation remain unclear, however, despite obvious consequences for population persistence and conservation in the face of ongoing global change. This study explored local adaptation and phenotypic plasticity of metabolic rates and thermal limits in the supratidal rockpool beetle Ochthebius lejolisii. Using populations from localities at different ends of the species range that experience contrasting thermal variability, we simultaneously tested two of the major paradigms of spatial physiological ecology: metabolic cold adaptation (MCA) and the climatic variability hypothesis (CVH). …

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Sealed In The Sacred Realm: Coming Of Age In The Liminal Spaces Of Hyrule, Alicia Fox-Lenz Aug 2024

Sealed In The Sacred Realm: Coming Of Age In The Liminal Spaces Of Hyrule, Alicia Fox-Lenz

Mythcon

The Legend of Zelda franchise commonly uses alternate dimensions or worlds in its storytelling. These dimensions are often tied to darkness — being a place where evil waits, gathering strength, or a sister-world that has fallen to evil and needs liberation — providing the hero, Link, with the primary conflict driving his adventure. Alongside these larger worlds that provide conflict, there exist smaller dimensions, liminal spaces where Link and a small cast of other heroic characters are brought for physical and spiritual maturation. We will discuss how these liminal spaces function as doors through which the player as Link crosses …

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The Genii Loci In The Midst Of Middle Earth, Richard Angelo Bergen Aug 2024

The Genii Loci In The Midst Of Middle Earth, Richard Angelo Bergen

Mythcon

Several scholars, including Tom Shippey, Philip Mitchell, and Gordon Sleuthag, all agree that Tom Bombadil is, among other things, Tolkien’s representation of the genius loci of the Old Forest. The argument is plausible and coherent, but there is much more that can be said about the spirits of places in Tolkien’s legendarium, and the traditions he draws from to craft his world of storied and mutable place. In general, an affection and attention for the local, which Tolkien extols in his letters and fiction, is rather amenable to ideas concerning the genius loci, as theorists such as Yi-Fu Tuan and …

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Investigating The Effects Of Visual Feedback On Muscle Activity, Heart Rate, Rpe, And Perceptions Of Performance In Ballet Dancers, Lilah A. Duboff, Sarah Dipasquale, Stephen Ives Aug 2024

Investigating The Effects Of Visual Feedback On Muscle Activity, Heart Rate, Rpe, And Perceptions Of Performance In Ballet Dancers, Lilah A. Duboff, Sarah Dipasquale, Stephen Ives

International Journal of Exercise Science

International Journal of Exercise Science 17(1): 1056-1067, 2024. Extreme postures and imbalances in neuromuscular activity may place classical ballet dancers at higher risk of injury. Dance studio mirrors provide visual feedback by which a dancer can self-correct their body position and alignment, but have been suggested to negatively impact kinesthetic abilities and decrease performance capabilities. Thus, we investigated the effects of a mirror on muscle activity of the quadriceps, heart rate (HR), rating of perceived exertion (RPE), and qualitative performance. A lack of visual feedback would increase muscle activity of the quadriceps, HR, and RPE, and decrease self-reported perception of …

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‘A Stout Heart And A Good Blade’: An Examination And Reconsideration Of Éowyn In J.R.R. Tolkien’S The Lord Of The Rings, Angela Loving Aug 2024

‘A Stout Heart And A Good Blade’: An Examination And Reconsideration Of Éowyn In J.R.R. Tolkien’S The Lord Of The Rings, Angela Loving

Mythcon

For my paper I will examine and reconsider the character of Éowyn in The Lord of the Rings. I will look at the ways in which Tolkien uses dramatic elements and patterns from traditional literatures, including the Old English poem Beowulf and Shakespeare’s Macbeth, to tell an ancient tale anew, the tale of a dragon slain by an unlikely hero, in this case the Shield Maiden,Éowyn, and an even more unlikely assistant, a Hobbit named Merry. My process will focus on readings of the text, reflecting on ways Tolkien’s adaptations amplify female voice, choice, and agency. Éowyn enters in the …

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Death, Soul, And Body In Tolkien’S Mythology: Perspectives On Athrabeth Finrod Ah Andreth, Chip Crane, Peter Grybauskas, Carl Hostetter Aug 2024

Death, Soul, And Body In Tolkien’S Mythology: Perspectives On Athrabeth Finrod Ah Andreth, Chip Crane, Peter Grybauskas, Carl Hostetter

Mythcon

The conversation between the elf Finrod Felagund and the human woman Andreth in Morgoth’s Ring volume 10 of The History of Middle-warth explores in depth the differences between elves and humans in Tolkien’s mythology. Their conversation touches, among other things, on the reason humans die and the relationship of soul to body in both. Panelists will share perspectives on the significance of this conversation in Tolkien’s mythology and his own metaphysics.

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The Year In Sf Movies, Scott Lohman Aug 2024

The Year In Sf Movies, Scott Lohman

Mythcon

This is a group discussion, after some opening remarks, about the Science Fiction (broadly interpreted to include what the audience brings up) movies of the past year or so.

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The Middle People Of Middle-Earth: Dwarven Displacement And Reconciliation In Tolkien’S Legendarium, Andrew Hickman Aug 2024

The Middle People Of Middle-Earth: Dwarven Displacement And Reconciliation In Tolkien’S Legendarium, Andrew Hickman

Mythcon

J.R.R. Tolkien’s beloved Dwarves evidence “middleness,” or a consistent state of being in flux or consistent change, as evidenced by their historical development, foreignness to other races, and displacement from their homes. The Dwarven race, from their first references in Tolkien’s works, are considered to be a race at odds with the other races of Ilúvatar. Tolkien’s Dwarves are initially seen as a politically neutral or an outright evil group, neither aligning themselves with followers of Manwë nor of Melkor. Additionally, they are described numerous times as more akin to the Orcish race than of the other Free Folk. While …

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Establishing And Sharing Collections Of Valuable Global Resource, R Reid Aug 2024

Establishing And Sharing Collections Of Valuable Global Resource, R Reid

IGC Proceedings (1977-2023)

The conservation of forage plant genetic resources has attracted growing public and scientific interest in recent times. The number of genebanks has risen significantly with a concomitant increase in the total number of accessions. Competition for funds and some duplication of effort has led to an increasing need for co-operation between the curators if the full potential of the germplasm is to be realised. International organisations such as PAO, the mandated CGIAR Centres and IBPGR, have played a major role in establishing sustainable forage genetic resource programmes; and despite the restrictions of limited funding, have made some significant achievements in …

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Germplasm Collecting By Iger: The Future, N R. Sackville Hamilton, K H. Chorlton, I D. Thomas, M D. Hayward Aug 2024

Germplasm Collecting By Iger: The Future, N R. Sackville Hamilton, K H. Chorlton, I D. Thomas, M D. Hayward

IGC Proceedings (1977-2023)

This paper will present novel approaches being implemented or planned lo improve future collections for forage germplasm, and to deal with changing priorities, with particular reference to Lolium perenne. With a large number of accessions already in the gene bank and providing a wide range of genes for possible utilisation, future collections must be targeted ever more precisely, The principle object is to acquire novel genes not already present in the gene bank, to maximise the proportion of genes in the gene pool of L. perenne that is held in the gene bank. A subsidiary object, to support not …

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Effects Of Phosphate And Stocking Rate On Mediterranean Grasslands In Northern Syria, A E. Osman, P S. Cocks Aug 2024

Effects Of Phosphate And Stocking Rate On Mediterranean Grasslands In Northern Syria, A E. Osman, P S. Cocks

IGC Proceedings (1977-2023)

Three rates of phosphate (0, 11 and 26 kg/ha P) were applied to phosphorus-deficient native grassland in northern Syria, and botanical composition, biomass and legume seed production were monitored. The experiment was grazed at low and high ( 1.1 and 2.3 sheep/ha per year) stocking rates. The site is typical of native grassland within the cereal zone of west Asia where cropping is not possible because of shallow, stony soils and steep slopes. Results showed that annual applications of P, even as low as 11 kg P/ha, corrected the deficiency in soil P and improved pasture production. The practical Implications …

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Assessment Of The Variation In Shear Strength Of Leaves Of Pasture Grasses, D A. Henry, R H. Macmillan, F M. Roberts, R J. Simpson Aug 2024

Assessment Of The Variation In Shear Strength Of Leaves Of Pasture Grasses, D A. Henry, R H. Macmillan, F M. Roberts, R J. Simpson

IGC Proceedings (1977-2023)

The shear strength of leaves of pasture grasses was measured using a shearing device. The mechanics of shearing were investigated and leaf strength was measured either as the force or the energy required to shear a leaf. The investigations indicate that the inherent strength of leaf tissue is best measured as a force corrected for the length of cutting blade in contact with the leaf. Inherent shear strength did not change along the length of a leaf blade, but did change with the physiological age of the leaf. Variation in shear strength within a population of annual ryegrass (Lolium …

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