Trong Hung Vo

Hanoi University of Mining and Geology, Vietnam

Obecnie w Quang Ninh w Wietnamie istnieje wiele podziemnych kopalń węgla, które eksploatują pokłady węgla znajdujące się pod składowiskami odpadów kopalnianych np: Khe Cham II, Mong Duong, Mao Khe i Ha Lam Coal Company. Wiele składowisk odpadów kopalnianych osiągnęło miąższość ponad 400m. Napór warstw składowiska odpadów kopalnianych traktowane jes...

Large rock mass deformation around deep roadways in the weak rocks was a significantproblem in mining activities in Vietnam and other countries. The excavation of roadways leads to highreleasing stress, which exceeds the peak strength of spalling surrounding rock and causes it to enter thepost-failure stage. Tensile failures then initiate and devel...

We report on a search for compact binary coalescences where at least one binary component has a mass between 0.2 $M_\odot$ and 1.0 $M_\odot$ in Advanced LIGO and Advanced Virgo data collected between 1 April 2019 1500 UTC and 1 October 2019 1500 UTC. We extend previous analyses in two main ways: we include data from the Virgo detector and we allow...

Results are presented of searches for continuous gravitational waves from 20 accreting millisecond X-ray pulsars with accurately measured spin frequencies and orbital parameters, using data from the third observing run of the Advanced LIGO and Advanced Virgo detectors. The search algorithm uses a hidden Markov model, where the transition probabilit...

High-quality optical resonant cavities require low optical loss, typically on the scale of parts per million. However, unintended micron-scale contaminants on the resonator mirrors that absorb the light circulating in the cavity can deform the surface thermoelastically, and thus increase losses by scattering light out of the resonant mode. The poin...

The second gravitational-wave transient catalog, GWTC-2, reported on 39 compact binary coalescences observed by the Advanced LIGO and Advanced Virgo detectors between 1 April 2019 15:00 UTC and 1 October 2019 15:00 UTC. Here, we present GWTC-2.1, which reports on a deeper list of candidate events observed over the same period. We analyze the final...

After the detection of gravitational waves from compact binary coalescences, the search for transient gravitational-wave signals with less well-defined waveforms for which matched filtering is not well-suited is one of the frontiers for gravitational-wave astronomy. Broadly classified into "short" $ \lesssim 1~$\,s and "long" $ \gtrsim 1~$\,s durat...

We report results from searches for anisotropic stochastic gravitational-wave backgrounds using data from the first three observing runs of the Advanced LIGO and Advanced Virgo detectors. For the first time, we include Virgo data in our analysis and run our search with a new efficient pipeline called pystoch on data folded over one sidereal day. We...

We report results of a search for an isotropic gravitational-wave background (GWB) using data from Advanced LIGO's and Advanced Virgo's third observing run (O3) combined with upper limits from the earlier O1 and O2 runs. Unlike in previous observing runs in the advanced detector era, we include Virgo in the search for the GWB. The results are consi...

The sensitivity of the advanced LIGO detectors to gravitational waves can be affected by environmental disturbances external to the detectors themselves. Since the transition from the former initial LIGO phase, many improvements have been made to the equipment and techniques used to investigate these environmental effects. These methods have aided...

This paper presents the results of a search for generic short-duration gravitational-wave transients in data from the third observing run of Advanced LIGO and Advanced Virgo. Transients with durations of milliseconds to a few seconds in the 24--4096 Hz frequency band are targeted by the search, with no assumptions made regarding the incoming signal...

We report the observation of gravitational waves from two compact binary coalescences in LIGO's and Virgo's third observing run with prop__erties consistent with neutron star–black hole (NSBH) binaries. The two events are named G_W200105_162426 and GW200115_042309, abbreviated as GW200105 and GW200115; the first was observed by LIGO Livingston and...

We report on an all-sky search for continuous gravitational waves in the frequency band 20-2000\,Hz and with a frequency time derivative in the range of $[-1.0, +0.1]\times10^{-8}$\,Hz/s. Such a signal could be produced by a nearby, spinning and slightly non-axisymmetric isolated neutron star in our galaxy. This search uses the LIGO data from the f...

We search for gravitational-wave transients associated with gamma-ray bursts (GRBs) detected by the Fermi and Swift satellites during the first part of the third observing run of Advanced LIGO and Advanced Virgo (2019 April 1 15:00 UTC-2019 October 1 15:00 UTC). A total of 105 GRBs were analyzed using a search for generic gravitational-wave transie...

We report the observation of gravitational waves from two compact binary coalescences in LIGO's and Virgo's third observing run with properties consistent with neutron star-black hole (NSBH) binaries. The two events are named GW200105_162426 and GW200115_042309, abbreviated as GW200105 and GW200115; the first was observed by LIGO Livingston and Vir...

Really cool mirrors Cooling objects to low temperature can increase the sensitivity of sensors and the operational performance of most devices. Removing most of the thermal vibrations—or phonons—such that the object reaches its motional quantum ground state has been achieved but typically with tiny, nanoscale objects. Using the suspended mirrors of...

We search for gravitational-wave signals produced by cosmic strings in the Advanced LIGO and Virgo full O3 dataset. Search results are presented for gravitational waves produced by cosmic string loop features such as cusps, kinks, and, for the first time, kink-kink collisions. A template-based search for short-duration transient signals does not yi...

We report on gravitational-wave discoveries from compact binary coalescences detected by Advanced LIGO and Advanced Virgo in the first half of the third observing run (O3a) between 1 April 2019 15∶00 UTC and 1 October 2019 15∶00 UTC. By imposing a false-alarm-rate threshold of two per year in each of the four search pipelines that constitute our se...

We present a search for quasi-monochromatic gravitational-wave signals from the young, energetic X-ray pulsar PSR J0537-6910 using data from the second and third observing runs of LIGO and Virgo. The search is enabled by a contemporaneous timing ephemeris obtained using Neutron star Interior Composition Explorer (NICER) data. The NICER ephemeris ha...

We present a search for dark photon dark matter that could couple to gravitational-wave interferometers using data from Advanced LIGO and Virgo's third observing run. To perform this analysis, we use two methods, one based on cross-correlation of the strain channels in the two nearly aligned LIGO detectors, and one that looks for excess power in th...

We present results of three wide-band directed searches for continuous gravitational waves from 15 young supernova remnants in the first half of the third Advanced LIGO and Virgo observing run. We use three search pipelines with distinct signal models and methods of identifying noise artifacts. Without ephemerides of these sources, the searches are...

Introduction Cluster analysis refers to a broad set of unsupervised learning techniques used to discover distinct subgroups or clusters within a set of data. This study aimed to distinguish different clinical characteristics among patients with suspicions of drug hypersensitivity reactions (DHRs) to iodinated radiocontrast media (iRCM) based on a c...

Introduction Devant une suspicion aiguë d’hypersensibilité médicamenteuse (HSM), l’arrêt du médicament considéré coupable et sa substitution avec une deuxième lignée thérapeutique peut avoir des conséquences néfastes, en exposant le patient concerné à des traitements potentiellement moins efficaces et peut-être pourvoyeurs d’autres effets indésirab...

We report on the population of 47 compact binary mergers detected with a false-alarm rate of <1 yr(-1) in the second LIGO-Virgo Gravitational-Wave Transient Catalog. We observe several characteristics of the merging binary black hole (BBH) population not discernible until now. First, the primary mass spectrum contains structure beyond a power law w...

Small, highly absorbing points are randomly present on the surfaces of the main interferometer optics in Advanced LIGO. The resulting nanometer scale thermo-elastic deformations and substrate lenses from these micron-scale absorbers significantly reduce the sensitivity of the interferometer directly though a reduction in the power-recycling gain an...

We present a search for continuous gravitational-wave emission due to r-modes in the pulsar PSR J0537-6910 using data from the LIGO-Virgo Collaboration observing run O3. PSR J0537-6910 is a young energetic X-ray pulsar and is the most frequent glitcher known. The inter-glitch braking index of the pulsar suggests that gravitational-wave emission due...

Résumé Les colorants bleus sont utilisés en médecine et en chirurgie de longue date. Injectés dans les tissus, ils sont dirigés vers le système lymphatique, ce qui permet l’identification directe des ganglions sentinelles lors de chirurgies oncologiques, dans le cadre d’un cancer du sein ou d’un mélanome. Trois d’entre eux sont utilisés à cette fin...

Small, highly absorbing points are randomly present on the surfaces of the main interferometer optics in Advanced LIGO. The resulting nano-meter scale thermo-elastic deformations and substrate lenses from these micron-scale absorbers significantly reduces the sensitivity of the interferometer directly though a reduction in the power-recycling gain...

The main objective of this research is to propose an optimized proportion of the fly ash of thermal power plants used in the concrete mixture for underground mine supports in Quang Ninh coal area. Fly ash is used as a partial replacement of cement in fresh concrete for underground mine supports to reduce the cost of drift supporting and to increase...

GW170817 is the very first observation of gravitational waves originating from the coalescence of two compact objects in the mass range of neutron stars, accompanied by electromagnetic counterparts, and offers an opportunity to directly probe the internal structure of neutron stars. We perform Bayesian model selection on a wide range of theoretical...

Advanced LIGO and Advanced Virgo are actively monitoring the sky and collecting gravitational-wave strain data with sufficient sensitivity to detect signals routinely. In this paper we describe the data recorded by these instruments during their first and second observing runs. The main data products are the gravitational-wave strain arrays, releas...

Experimental and numerical research of the effect of blasting vibrations during tunneling on surrounding structures (rock mass, existing tunnels, buildings, etc.) was widely studied in recent years. However, the effect of blasting vibration from a new tunnel on an existing adjacent tunnel is still unclear. A few researches were carried out to study...

Although typhoons have not occurred frequently in Southern Vietnam, they caused huge damage for this region. Their effects are on human deaths, injuries, and infrastructure caused by cyclonic winds, storm surges and heavy rains. In this thesis the likely reasons for this damage are explored and the extent to which these hazards could have been prev...

Laginex AS Biological Larvicide (Lagenidium giganteum) and Vectobac-12AS (Bacillus thuringiensis var. israelensis) were compared in plastic pools containing laboratory-reared Culex quinquefasciatus larvae located in a wooded area in Panama City, FL, in August and September 1997. The pools were dipped at 2-day intervals to assess larval control. Sen...

Laginex(TM) AS Biological Larvicide (Lagenidium giganteum) and Vectobac(TM)-12AS (Bacillus thuringiensis var, israelensis) were compared in plastic pools containing laboratory-reared Culex quinquefasciatus larvae located in a wooded area in Panama City, FL, in August and September 1997. The pools were dipped at 2-day intervals to assess larval cont...

This paper describes the formulation and operation of a Reserves and Economic Analysis program written for micro-computers. The program was constructed as a template to be used with spread-sheet software. The version being discussed in this paper uses a popular commercial software program called 1-2-3* which was written for the 1MB-PC** or compatib...