scholarly journals SOGRO (Superconducting Omni-directional Gravitational Radiation Observatory)

2018 ◽  
Vol 168 ◽  
pp. 01005 ◽  
Author(s):  
Ho Jung Paik
Keyword(s):  
Gravitational Radiation ◽  
Thermal Noise ◽  
Low Frequency ◽  
Newtonian Gravity ◽  
Strain Sensitivity ◽  
Wave Polarization ◽  
Intermediate Mass ◽  
Binary Black Holes ◽  
New Era ◽  
Made In

Detection of gravitational waves (GWs) from merging binary black holes (BHs) by Advanced LIGO has ushered in the new era of GW astronomy. Many conceivable sources such as intermediate-mass BH binaries and white dwarf binaries, as well as stellar-mass BH inspirals, would emit GWs below 10 Hz. It is highly desirable to open a new window for GW astronomy in the infrasound frequency band. A low-frequency tensor detector could be constructed by combining six magnetically levitated superconducting test masses. Such a detector would be equally sensitive to GWs coming from anywhere in the sky, and would be capable of resolving the source direction and wave polarization. I will present the design concept of a new terrestrial GW detector, named SOGRO, which could reach a strain sensitivity of 10−19-10−21 Hz−1/2 at 0.1-10 Hz. Seismic and Newtonian gravity noises are serious obstacles in constructing terrestrial GW detectors at frequencies below 10 Hz. I will explain how these noises are rejected in SOGRO. I will also report the progress made in designing the platform and modelling its thermal noise.

scholarly journals Dark matter gravity waves at LIGO and LISA

2019 ◽  
Vol 34 (16) ◽  
pp. 1950124
Author(s):  
Paul H. Frampton
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Gravitational Wave ◽  
Gravity Waves ◽  
Gravitational Radiation ◽  
Massive Stars ◽  
Strain Sensitivity ◽  
Intermediate Mass ◽  
To Come ◽  
Merger Rate

We study the merger rate of dark matter PIMBHs (Primordial Intermediate Mass Black Holes). We conclude that the black holes observed by LIGO in GW150914 and later events were probably not dark matter PIMBHs but rather the result of gravitational collapse of very massive stars. To study the PIMBHs by gravitational radiation will require a detector sensitive to frequencies below 10 Hz and otherwise more sensitive than LIGO. The LISA detector, expected to come online in 2034, will be useful at frequencies below 1 Hz but further gravitational wave detectors beyond LISA, sensitive up to 10 Hz, and higher strain sensitivity will be necessary to fully study dark matter.

Research on Vibration Isolation Parameters of Double-Deck Isolation System of Heat Water Pump

2013 ◽  
Vol 694-697 ◽  
pp. 316-320
Author(s):  
Xiang Jun Kong ◽  
Er Ming Song ◽  
Chang Zheng Chen
Keyword(s):  
Power Flow ◽  
Vibration Isolation ◽  
Low Frequency ◽  
Mass Effect ◽  
Transmitted Power ◽  
Intermediate Mass ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Upper Deck ◽  
Vibration Power Flow

Isolation system of the heat water pumps can be simplified as a double sources exciting and double output double-deck vibration isolation system model, expressions of transmitted power flow and vibration speed to the basement are deduced based on the double sources exciting and double output double-deck vibration isolation system electric-force(E-F) analog picture, the curves of power flow and vibration speed transmitted to basement how the upper deck vibration isolation and intermediate mass effect are drawn by using mat lab program. The results show that the adjusting the upper deck vibration isolation stiffness parameters has little effect on the amplitude of vibration power flow, increasing intermediate mass can move first peak to the low frequency, increasing intermediate mass can obviously reduce t transmitted power flow and transmitted vibration speed amplitude to the basement.

Low-frequency thermal noise in magnetized plasmas

1996 ◽  
Vol 53 (6) ◽  
pp. 720-727
Author(s):  
Klaus Elsässer ◽  
Hamid Saleem
Keyword(s):  
Thermal Noise ◽  
Low Frequency ◽  
Magnetized Plasmas

Photoproduction of Gravitational Radiation in Static Electromagnetic Fields. Radiative Corrections

1975 ◽  
Vol 53 (20) ◽  
pp. 2315-2320 ◽  
Author(s):  
G. Papini ◽  
S. -R. Valluri
Keyword(s):  
Cross Section ◽  
Gravitational Radiation ◽  
Low Energy ◽  
Radiative Corrections ◽  
Third Order ◽  
The Third ◽  
Relativistic Approximation ◽  
Effective Lagrangian ◽  
Charge Renormalization ◽  
Made In

The radiative corrections of second and third order for the process of photoproduction of gravitons in Coulomb and magnetic dipole fields have been calculated.All divergences have been removed either by charge renormalization or regularization. No approximations have been made in the calculation of the second order cross section. In the third order calculation only the extreme relativistic approximation is given. The forms of the effective Lagrangian, corresponding to the low energy approximations have been determined.

scholarly journals The Rise of the OM-LoC: Opto-Microfluidic Enabled Lab-on-Chip

Micromachines ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1467
Author(s):  
Harry Dawson ◽  
Jinane Elias ◽  
Pascal Etienne ◽  
Sylvie Calas-Etienne
Keyword(s):  
Low Cost ◽  
Optical Components ◽  
New Era ◽  
Lab On Chip ◽  
Highly Sensitive ◽  
Multiple Challenges ◽  
On Chip ◽  
Optical Circuits ◽  
Made In

The integration of optical circuits with microfluidic lab-on-chip (LoC) devices has resulted in a new era of potential in terms of both sample manipulation and detection at the micro-scale. On-chip optical components increase both control and analytical capabilities while reducing reliance on expensive laboratory photonic equipment that has limited microfluidic development. Notably, in-situ LoC devices for bio-chemical applications such as diagnostics and environmental monitoring could provide great value as low-cost, portable and highly sensitive systems. Multiple challenges remain however due to the complexity involved with combining photonics with micro-fabricated systems. Here, we aim to highlight the progress that optical on-chip systems have made in recent years regarding the main LoC applications: (1) sample manipulation and (2) detection. At the same time, we aim to address the constraints that limit industrial scaling of this technology. Through evaluating various fabrication methods, material choices and novel approaches of optic and fluidic integration, we aim to illustrate how optic-enabled LoC approaches are providing new possibilities for both sample analysis and manipulation.

Searches for low-frequency bursts of gravitational radiation

1985 ◽  
Vol 28 (10) ◽  
pp. 938-939 ◽  
Author(s):  
Vladimir B Braginskiĭ ◽  
A V Gusev ◽  
V P Mitrofanov ◽  
V N Rudenko ◽  
V N Yakimov
Keyword(s):  
Gravitational Radiation ◽  
Low Frequency

Karl Marx's Vision of America: A Biographical and Bibliographical Sketch

1980 ◽  
Vol 42 (4) ◽  
pp. 465-503
Author(s):  
Robert Weiner
Keyword(s):  
United States ◽  
Middle Class ◽  
Working Class ◽  
Karl Marx ◽  
The United States ◽  
Abraham Lincoln ◽  
New Era ◽  
War Of Independence ◽  
Made In

Karl Marx and the United States is a subject which immediately elicits interest, but also surprise. Interest, because of its contemporary importance; surprise, because Marx and America have appeared so remote from one another. Marx has definitely influenced America, but that will not be the theme of this essay —instead, we will concern ourselves with the role of America in the thought of Marx. The magnitude of this role is illustrated by a statement made in Marx's letter to Abraham Lincoln, written in 1864 on behalf of the International Workingmen's Association:The workingmen of Europe feel sure that as the American war of independence initiated a new era of the ascendency of the middle-class, so the American Anti-slavery war will do for the working-class.

scholarly journals Quasi-monolithic mirror suspensions in ground-based gravitational-wave detectors: an overview and look to the future

2018 ◽  
Vol 376 (2120) ◽  
pp. 20170281 ◽  
Author(s):  
Anna-Maria A. van Veggel
Keyword(s):  
Gravitational Wave ◽  
Seismic Isolation ◽  
Thermal Noise ◽  
Fused Silica ◽  
New Era ◽  
The Future ◽  
Gravitational Wave Detectors ◽  
The Status ◽  
History Of ◽  
The Universe

At the commencement of a new era in astrophysics, with added information from direct detections of gravitational-wave (GW) signals, this paper is a testament to the quasi-monolithic suspensions of the test masses of the GW detectors that have enabled the opening of a new window on the universe. The quasi-monolithic suspensions are the final stages in the seismic isolation of the test masses in GW detectors, and are specifically designed to introduce as little thermal noise as possible. The history of the development of the fused-silica quasi-monolithic suspensions, which have been so essential for the first detections of GWs, is outlined and a glimpse into the status of research towards quasi-monolithic suspensions made of sapphire and silicon is given. This article is part of a discussion meeting issue ‘The promises of gravitational-wave astronomy’.

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