A5073203082- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Advanced Electron Microscopy Techniques and Applications
- Advanced Frequency and Time Standards
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Genomics and Phylogenetic Studies
- Seismic Waves and Analysis
- Bacterial biofilms and quorum sensing
- Cell Image Analysis Techniques
- Photosynthetic Processes and Mechanisms
- Innovative Microfluidic and Catalytic Techniques Innovation
- Astrophysical Phenomena and Observations
- Lipid Membrane Structure and Behavior
- Geophysics and Sensor Technology
- Bacteriophages and microbial interactions
- Bacterial Genetics and Biotechnology
- Glycosylation and Glycoproteins Research
- Atomic and Subatomic Physics Research
- Geomagnetism and Paleomagnetism Studies
- Algal biology and biofuel production
- Microbial Fuel Cells and Bioremediation
- IoT and Edge/Fog Computing
- HIV Research and Treatment
Jiangxi University of Finance and Economics
2024
California Institute of Technology
2005-2019
Data collected by the GEO 600 and LIGO interferometric gravitational wave detectors during their first observational science run were searched for continuous waves from pulsar J1939+2134 at twice its rotation frequency. Two independent analysis methods used are demonstrated in this paper: a frequency domain method time method. Both achieve consistent null results, placing new upper limits on strength of pulsar's emission. A model emission mechanism is to interpret as constraint equatorial...
We report on a search for gravitational waves from coalescing compact binary systems in the Milky Way and Magellanic Clouds. The analysis uses data taken by two of three LIGO interferometers during first science run illustrates method setting upper limits inspiral event rates using interferometer data. pipeline is described with particular attention to selection coincidence between interferometers. establish an observational limit R<1.7×102 per year Equivalent Galaxy (MWEG), 90% confidence,...
We place direct upper limits on the amplitude of gravitational waves from 28 isolated radio pulsars by a coherent multidetector analysis data collected during second science run LIGO interferometric detectors. These are first for 26 pulsars. use coordinated observations time to build radio-guided phase templates expected gravitational-wave signals. The unprecedented sensitivity detectors allows us set strain as low few times 10(-24). translate into equatorial ellipticities pulsars, which...
We use 373 hours ($\ensuremath{\approx}15$ days) of data from the second science run LIGO gravitational-wave detectors to search for signals binary neutron star coalescences within a maximum distance about 1.5 Mpc, volume space which includes Andromeda Galaxy and other galaxies Local Group galaxies. This analysis requires signal be found in at two sites, according set coincidence criteria. The background (accidental rate) is determined used judge significance event candidates. No inspiral...
We report on a search for gravitational wave bursts using data from the first science run of Laser Interferometer Gravitational Wave Observatory (LIGO) detectors. Our focuses with durations ranging 4 to 100 ms, and significant power in LIGO sensitivity band 150 3000 Hz. bound rate such detected at less than 1.6 events per day 90% confidence level. This result is interpreted terms detection efficiency ad hoc waveforms (Gaussians sine Gaussians) as function their root-sum-square strain hrss;...
A new method for recording both fluorescence and cryo-EM images of small bacterial cells was developed used to identify chemoreceptor arrays in cryotomograms intact Caulobacter crescentus cells. We show that wild-type preserved a near-native state, the chemoreceptors are hexagonally packed with lattice spacing 12 nm, just few tens nanometers away from flagellar motor they control. The were always found on convex side cell, further demonstrating maintain dorsal/ventral as well...
The endosomal-sorting complex required for transport (ESCRT) is evolutionarily conserved from Archaea to eukaryotes. drives membrane scission events in a range of processes, including cytokinesis Metazoa and some Archaea. CdvA the protein that recruits ESCRT-III membrane. Using electron cryotomography (ECT), we find polymerizes into helical filaments wrapped around liposomes. proteins are responsible cinching membranes have been shown assemble tubes vitro, but here show they also can form...
We present the analysis of between 50 and 100 h coincident interferometric strain data used to search for establish an upper limit on a stochastic background gravitational radiation. These come from first LIGO science run, during which all three interferometers were operated over 2-week period spanning August September 2002. The method cross correlating outputs two is analysis. describe in detail practical signal processing issues that arise when working with real data, we observational...
We use data from the second science run of LIGO gravitational-wave detectors to search for gravitational waves primordial black hole binary coalescence with component masses in range $0.2--1.0{M}_{\ensuremath{\bigodot}}$. The analysis requires a signal be found both observatories, according set coincidence criteria. No inspiral signals were found. Assuming spherical halo core radius 5 kpc extending 50 containing nonspinning holes $0.2--1.0{M}_{\ensuremath{\bigodot}}$, we place an...
Three-dimensional electron microscopy techniques like tomography provide valuable insights into cellular structures, and present significant challenges for data storage dissemination. Here we explored a novel method to publicly release more than 11,000 such datasets, 30 TB in total, collected by our group. Our method, based on peer-to-peer file sharing network built around blockchain ledger, offers distributed solution storage. In addition, offer user-friendly browser-based interface,...
We perform a wide parameter space search for continuous gravitational waves over the whole sky and large range of values frequency first spin-down parameter. Our method is based on Hough transform, which semi-coherent, computationally efficient, robust pattern recognition technique. apply this technique to data from second science run LIGO detectors our final results are all-sky upper limits strength emitted by unknown isolated spinning neutron stars set narrow bands in 200-$400 $Hz. The...
We have performed a search for bursts of gravitational waves associated with the very bright Gamma Ray Burst GRB030329, using two detectors at LIGO Hanford Observatory. Our covered most sensitive frequency range (approximately 80-2048 Hz), and we specifically targeted signals shorter than 150 ms. algorithm looks excess correlated power between interferometers thus makes minimal assumptions about waveform. observed no candidates wave signal strength larger pre-determined threshold. report...
We perform a search for gravitational wave bursts using data from the second science run of LIGO detectors, method based on wavelet time-frequency decomposition. This is sensitive to duration much less than and with frequency content in 100--1100 Hz range. It features significant improvements instrument sensitivity analysis pipeline respect burst previously reported by LIGO. Improvements allow exploring weaker signals, relative detector noise floor, while maintaining low false alarm rate,...
While much is already known about the basic metabolism of bacterial cells, many fundamental questions are still surprisingly unanswered, including for instance how they generate and maintain specific cell shapes, establish polarity, segregate their genomes, divide. In order to understand these phenomena, imaging technologies needed that bridge resolution gap between fluorescence light microscopy higher-resolution methods such as X-ray crystallography NMR spectroscopy. Electron cryotomography...
To divide, Gram-negative bacterial cells must remodel cell wall at the division site. It remains debated, however, whether this remodeling alone can drive membrane constriction, or if a constrictive force from tubulin homolog FtsZ is required. Previously, we constructed software (REMODELER 1) to simulate during growth. Here, expanded explore 2). We found that simply organizing synthesis complexes midcell not sufficient cause invagination, even with implementation of make-before-break...
Abstract Three-dimensional electron microscopy techniques like tomography provide valuable insights into cellular structures, and present significant challenges for data storage dissemination. Here we explored a novel method to publicly release more than 11,000 such datasets, 30 TB in total, collected by our group. Our method, based on peer-to-peer file sharing network built around blockchain ledger, offers distributed solution storage. In addition, offer user-friendly browser-based...
The LIGO interferometers are operating as gravitational wave observatories, with a noise level near an order of magnitude the goal and first scientific data recently taken. This has been analyzed for four different categories sources; millisecond bursts, inspiralling binary neutron stars, periodic waves from known pulsar, stochastic background. Research development is also underway next generation detector, Advanced LIGO.
Abstract To divide, Gram-negative bacterial cells must remodel their peptidoglycan cell wall to a smaller and radius at the division site, but how this process occurs remains debated. While tubulin homolog FtsZ is thought generate constrictive force, it has also been proposed that remodeling alone sufficient drive membrane constriction, possibly via make-before-break mechanism in which new hoops of are made inside existing (make) before bonds cleaved (break). Previously, we constructed...