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#33096141   2020/10/20 To Up

Does size matter? Examining the possible mechanisms of multi-stallion groups in horse societies.

In some feral horse populations, adult females are either associated with a single male or multiple males (stallions). However, little is known on why such groups with more than one male exist, considering that stallions fight to monopolize females. Body size is often an important determinant of male fighting ability and/or dominance rank and, consequently, reproductive success. Stallions may, therefore, vary in "quality" which could be a differentiating factor between single-stallion and multi-stallion males. We observed feral Garrano horses in Northern Portugal and examined the relationship between body size, sex, group type and number of females. Using a non-invasive laser distance meter, we determined individual body length and height by overlapping photos of the horses and a measuring tape. We tested the accuracy of remote measurements by comparison with manually measuring domestic horses and found no statistical differences between the two methods. Thus, we assume the values obtained were reliable and the methodology used was a useful tool for assessing morphological characteristics. Results showed no significant differences in body length and height for all parameters assessed, suggesting that size is not a determinant factor for feral horse society. Thus, other factors may be more important to explain the existence of single and multi-stallion groups.
Pandora Pinto, Satoshi Hirata

1589 related Products with: Does size matter? Examining the possible mechanisms of multi-stallion groups in horse societies.

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#33094924   2020/10/23 To Up

Characterizing practice effects in performance-based tests administered to users of unilateral lower limb prostheses: A preliminary study.

Performance-based tests are viewed as a gold standard for measuring physical capability. Practice effects however, may threaten their predictive, discriminative, and evaluative applications. Despite these potential consequences, practice effects have received limited attention in users of lower-limb prostheses (LLP).
Andrew Sawers, Brian J Hafner

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#33094204   // To Up

Quantum Estimation of Parameters of Classical Spacetimes.

We describe a quantum limit to measurement of classical spacetimes. Specifically, we formulate a quantum Cramér-Rao lower bound for estimating the single parameter in any one-parameter family of spacetime metrics. We employ the locally covariant formulation of quantum field theory in curved spacetime, which allows for a manifestly background-independent derivation. The result is an uncertainty relation that applies to all globally hyperbolic spacetimes. Among other examples, we apply our method to detection of gravitational waves with the electromagnetic field as a probe, as in laser-interferometric gravitational-wave detectors. Other applications are discussed, from terrestrial gravimetry to cosmology.
T G Downes, J R van Meter, E Knill, G J Milburn, C M Caves

1627 related Products with: Quantum Estimation of Parameters of Classical Spacetimes.

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#33086502   2020/10/19 To Up

Preparation and Characterization of Semi-Flexible Substrates from Natural Fiber/Nickel Oxide/Polycaprolactone Composite for Microstrip Patch Antenna Circuitries for Microwave Applications.

The study intended to utilizing waste organic fiber for low-cost semi-flexible substrate fabrication to develop microstrip patch antennas for low band communication applications. All the semi-flexible substrates (12.2 wt. % OPEFF/87.8 wt. % PCL, 12.2 wt. % NiO/87.8 wt. % PCL, and 25 wt. % OPEFF/25 wt. % NiO/50 wt. % PCL) were fabricated by oil palm empty fruit fiber (OPEFF) mixed with nickel oxide (NiO) nanoparticles reinforced with polycaprolactone (PCL) as a matrix using a Thermo Haake blending machine. The morphology and crystalized structure of the substrates were tested using Fourier transform infrared (FTIR) spectrometry, X-ray diffraction (X-RD) technique, and scanning electron microscopy (SEM), respectively. The thermal stability behavior of the substrates was analyzed using thermogravimetric analysis (TGA) and differential thermogravimetric (DTG) thermogram. The dielectric properties were characterized by an open-ended coaxial probe (OEC) connected with Agilent N5230A PNA-L Network Analyzer included the 85070E2 dielectric software at frequency range of 8 to 12 GHz. The experimental results showed that NiO/OPEFF/PCL composites exhibit controllable permittivity dielectric constant εr'(f) between 1.89 and 4.2 (Farad/meter, (F/m)), with loss factor εr''(f) between 0.08 and 0.62 F/m, and loss tangent (tan δ) between 0.05 and 0.18. Return losses measurement of the three patch antennas OPEFF/PCL, NiO/PCL, and OPEFF/NiO/PCL are -11.93, -14.2 and -16.3 dB respectively. Finally, the commercial software package, Computer Simulation Technology Microwave Studio (CSTMWS), was used to investigate the antenna performance by simulate S-parameters based on the measured dielectric parameters. A negligible difference is found between the measured and simulated results. Finally, the results obtained encourage the possibility of using natural fibers and nickel oxide in preparation of the substrates utilize at microwave applications.
Ahmad Fahad Ahmad, Sidek Ab Aziz, Yazid Yaakob, Ammar Abd Ali, Nour Attallah Issa

2822 related Products with: Preparation and Characterization of Semi-Flexible Substrates from Natural Fiber/Nickel Oxide/Polycaprolactone Composite for Microstrip Patch Antenna Circuitries for Microwave Applications.

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#33084618   2020/06/30 To Up

Effects of Mosquito coil Smoke Inhalation on Spatial Memory in Mice.

Mosquito coil (MC) is widely used to repel mosquitoes in order to prevent malaria in many malaria-endemic countries. Although we are fully aware and concerned about carbon monoxide (CO) and its toxicity, exposure to CO from common, though occult sources like MC smoke is often overlooked. Equally, the adverse health effects, especially to the brain, are usually underestimated.
Musa Ibrahim Kurawa, Rabiu AbduSSalam Magaji, Tanko Yusuf, Mohammed Garba Magaji

1182 related Products with: Effects of Mosquito coil Smoke Inhalation on Spatial Memory in Mice.

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#33083773   2020/10/16 To Up

Quantitative assessment of olfactory dysfunction accurately detects asymptomatic COVID-19 carriers.

COVID-19 threatens the global community because a large fraction of infected people are asymptomatic, yet can effectively transmit SARS-CoV-2. Finding and isolating these silent carriers is a crucial step in confining the spread of the disease. A sudden loss of the sense of smell has been self-reported by COVID-19 patients across different countries, consistent with expression of the molecular factors mediating SARS-CoV-2 uptake into human olfactory epithelial supporting cells. However, precise quantification of olfactory loss in asymptomatic COVID-19 carriers is missing to date.
Anindya S Bhattacharjee, Samir V Joshi, Shilpa Naik, Shashikala Sangle, Nixon M Abraham

1799 related Products with: Quantitative assessment of olfactory dysfunction accurately detects asymptomatic COVID-19 carriers.

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#33083501   2020/10/16 To Up

Internet of things based smart energy management in a vanadium redox flow battery storage integrated bio-solar microgrid.

In this paper, an optimized energy management scheme for Solar PV, Biogas, Vanadium Redox Flow Battery (VRFB) storage integrated grid-interactive hybrid microgrid system has been implemented using a low-cost Internet of Things (IoT) based smart communication platform. The energy monitoring and control architecture of the proposed system consists of four main parts; 1) Low-cost energy meter for real-time data acquisition for multiple renewable energy sources (Solar PV, Biomass), VRFB storage, grid and loads. 2) Monitoring, control & fault detection using Raspberry-Pi (Single Board Computer) platform and MODBUS over TCP/IP platform. 3) Cloud-based remote monitoring unit (RMU) using Message Queuing Telemetry Transport (MQTT) server and ThingSpeak Middleware. 4) Capacity measurement of biogas production along with automatic start/stop control of biogas engine-generator. 5) VRFB storage scheduling for peak demand shaving. A PSCAD simulation study has been done to realize the hybrid microgrid interconnection. The developed smart communication system performance is validated by a practical 10kW solar PV, 15kVA biogas plant, 6 kWh VRFB storage integrated hybrid microgrid which satisfies peak demand management and ensures zero loss of power supply probability for dynamic load profile. Four real-life case studies have been done for the practical realization of the proposed energy management algorithm performance. Another significant contribution of this paper is the utilization of the solar PV power even during grid outage scenario at day time. It is made possible by intelligent interfacing of biogas power generator which acts as a reference AC bus for the grid-tied solar inverter and thus the available solar PV power can be used to serve the critical loads during grid outage condition. The proposed smart hybrid microgrid solution claims to be a generalized one, low cost compared to existing alternatives and applicable to satisfy scalable community energy security as well.
Hiranmay Samanta, Ankur Bhattacharjee, Moumita Pramanik, Abhijit Das, Konika Das Bhattacharya, Hiranmay Saha

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