A5102814616- Geophysics and Sensor Technology
- Seismic Waves and Analysis
- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Planetary Science and Exploration
- High-pressure geophysics and materials
- Earthquake Detection and Analysis
- Superconducting and THz Device Technology
- Superconducting Materials and Applications
- Nonlinear Waves and Solitons
- Microwave Engineering and Waveguides
- Gyrotron and Vacuum Electronics Research
- Numerical methods for differential equations
- Physics of Superconductivity and Magnetism
- Robotic Mechanisms and Dynamics
- Nonlinear Photonic Systems
- Fluid Dynamics and Thin Films
- Radio Frequency Integrated Circuit Design
- Magnetic confinement fusion research
- Metamaterials and Metasurfaces Applications
- Radio Astronomy Observations and Technology
- Quantum Electrodynamics and Casimir Effect
- Polynomial and algebraic computation
- Control and Dynamics of Mobile Robots
- Noncommutative and Quantum Gravity Theories
University of Maryland, College Park
2021-2023
ARC Centre of Excellence for Engineered Quantum Systems
2017
The University of Western Australia
2017
Instituto Tecnológico de Aeronáutica
2014-2015
Universidade de São Paulo
2012-2015
Here we present a status report of the Schenberg antenna. In past three years it has gone to radical upgrading operation, in which have been installing 1K pot dilution refrigerator, cabling and amplifiers for nine transducer circuits, designing new suspension vibration isolation system microstrip antennas, developing full set transducers, oscillators. We are also studying an innovative approach, could transform into broadband gravitational wave detector.
Broadband seismometers and gravitational wave detectors make use of mechanical resonators with a high quality factor to reduce Brownian noise. At low frequency, noise is ultimately dominated by internal friction in the suspension, which has 1/f compared white arising from viscous dissipation. Internal typically modeled as frequency-dependent loss can be challenging measure reliably through experiment. In this work, we present physics experimental implementation electrostatic frequency...
In this work the main task was to measure remote coupling between a probe and some niobium superconducting reentrant cavities for use in parametric transducers of gravitational wave detectors. The were manufactured from RRR300 cryogenically tested determine electromagnetic among other parameters. These also closed using cover forming narrow axial gap with post top. A hole made at base opposite order reach cavity. Generally, critical (β ≈ 1) is achieved inside mechanical connection transducer...
Parametric transducers can work below the quantum limit of sensitivity for resonant mass gravitational wave detectors. This makes them a promising alternative electromechanical transductance such These consist reentrant superconducting niobium cavity coupled to mass-spring system with three mechanical modes. cavities have central post responsible creating narrow axial gap between its top and wall, which is membrane. Their displacement (df/dx) increases as spacing decreases. However, this not...
The main purpose of this work is to optimize the electric Q-factor superconducting niobium klystron cavities be used in parametric transducers Mario Schenberg gravitational wave detector. Many were manufactured from with relatively high tantalum impurities (1420 ppm) and they cryogenically tested determine their resonance frequencies, unloaded electrical quality factors (Q0) electromagnetic couplings. These closed a flat plate below 1000 ppm an order 105 have been obtained. AC conductivity...
ABSTRACT As long-period ground motion holds the key to understanding interior of Earth’s Moon, reducing noise sources will be an essential area focus in design future lunar seismometers. For proposed Lunar Geophysical Network (LGN), International (ILN) Science Definition Team specifies that LGN enabling seismometer need more sensitive than any previous at frequencies below 1 Hz. In effort toward lowering floor for geophysical missions, we evaluate 1/f Brownian and temperature sensitivity a...
The present work aims to study equilibrium configurations of spins on a cylinder with topological defects such as screw dislocation and deficit angle. By making use elliptic-f expansion method, which in turn utilizes the Jacobi elliptic functions, we obtain exact solutions nonlinear sigma model this geometry. We have significant changes qualitative behavior due presence parameter k dislocation. In particular, soliton-like solutions, characteristic without dislocation, was not found here proposed.
Lunar seismology is a critical area of research, providing insights into the Moon's internal structure, composition, and thermal history, as well informing design safe resilient habitats for future human settlements. This paper presents development state-of-the-art, three-axis broadband seismometer with low frequency range 0.001-1 Hz target sensitivity over an order magnitude greater than previous Apollo-era instruments. The details design, assembly, methodology test results. We...
A broadband seismometer has been identified as an important scientific instrument that can be deployed on the surface of Earth’s Moon in near future. To achieve goals International Lunar Network, this next generation seismometers is required to at least 2 × 10−10 ms−2 Hz−1/2 1 mHz, which are several orders magnitude more sensitive same frequency than ones during Apollo program; their goal capture lunar seismic noise floor, observe normal modes, and record distant teleseisms from all over...
Microwave reentrant cavities are used for many applications in science and engineering. The potential both high mechanical tunability electric quality factors make them important tools areas. They usually resonant cylindrical with a central post, which makes small gap spacing the cavity wall. By adding an arbitrary number of extra posts, they generalized to type multiple post cavity. This new approach has been theoretically studied but no experimental results have presented. main purpose...
Lunar seismology is a critical area of research, providing insights into the Moon's internal structure, composition, and thermal history, as well informing design safe resilient habitats for future human settlements. This paper presents development state-of-the-art, three-axis broadband seismometer with low-frequency range 0.001-1 Hz target sensitivity over one order magnitude greater than previous Apollo-era instruments. The details design, assembly, methodology, test results. We compare...
In this paper we introduce a proposal for the kinematics of bodies in uniform circular motion. This model could contribute explanation two main problems contemporary cosmology: dark matter and energy. We use one physical properties space - gravitational waves to define reference frame at rest with respect determine mechanism synchronization clocks. So derive through Postulate so-called transformations Lorentz new velocity rotational clarify both cosmological problems. contribution would come...
Abstract State-of-the-art detectors are necessary to measure very tiny variations of gravity produced by spiraling neutron stars, merging black holes and moving tectonic plates. We developing a superconducting gradiometer aim achieve 0.1 mE Hz −1/2 (1 E ≡ 10 –9 s –2 ) in the frequency band mHz Hz. The test masses levitated current-carrying monolayer pancake coil, which is one key components instrument. However, nonlinear aspect coil inductance with respect mass separation imposes main...