abstract stringlengths 3 192k | title stringlengths 4 857 |
|---|---|
a model is presented for design of a thickener for solid-liquid separation where the flocs or aggregates within the solid-liquid suspension undergo an aggregate densification process due to the action of rakes. this aggregate densification facilitates suspension dewatering. the novel feature of the model is that it man... | designing thickeners by matching hindered settling and gelled suspension zones in the presence of aggregate densification |
nonlinear interactions of high power hf radio waves in the ionosphere provide aeronomers with a unique space-based laboratory capability. the high-frequency active auroral research program (haarp) in gakona, alaska is the world's largest heating facility, yielding effective radiated powers in the gigawatt range. new re... | "twisted beam" see observations of ionospheric heating from haarp |
safe management of radioactive waste is challenging to waste producers and waste management organisations. deployment of thermal treatment technologies can provide significant improvements: volume reduction, waste passivation, organics destruction, safety demonstration facilitation, etc. the ec-funded theramin project ... | thermal treatment for radioactive waste minimisation |
aimanimal tracking can provide unique insights into the ecology and conservation of marine species, such as the partitioning of habitat, including differences between life history stages or sexes, and can inform fisheries stock assessments, bycatch reduction and spatial management such as dynamic management.locationnor... | seasonal spatial segregation in blue sharks (prionace glauca) by sex and size class in the northeast pacific ocean |
changes in cell size, density, and morphology of three microalgae were characterized across a batch growth curve in relation to nitrate availability. these results were then evaluated theoretically and experimentally in the context of gravity sedimentation. nannochloropsis salina, chlorella sp. (marine), and haematococ... | the effect of nitrogen depletion on the cell size, shape, density and gravitational settling of nannochloropsis salina, chlorella sp. (marine) and haematococcus pluvialis |
experimental data from batch settling tests on polymer flocculated suspensions was used to determine the material properties that quantify dewatering behaviour and relate settling rate to solids concentration. these material properties were subsequently used to predict the performance of a pilot-scale gravity thickener... | aggregate densification in the thickening of flocculated suspensions in an un-networked bed |
the optimisation of solid-liquid separation or dewatering processes for more efficient operation and reuse of material streams is of high importance. suspension dewatering aims to increase the solids concentration and exhibits two limitations: the dewatering extent and the rate. a novel dewatering device, called high p... | high pressure dewatering rolls: comparison of a novel prototype to existing industrial technology |
recent tension-torsion experiments on al-6061-t6 tubes have shown that strains inside localization zones that precede failure are much higher than previously reported. furthermore, contrary to some other results, the measured strain at failure monotonically decreases as the triaxiality increases. this paper will review... | ductile failure under combined tension and shear |
characterizing habitat suitability for a marine predator requires an understanding of the environmental heterogeneity and variability over the range in which a population moves during a particular life cycle. female california sea lions (zalophus californianus) are central‑place foragers and are particularly constraine... | characterizing habitat suitability for a central‑place forager in a dynamic marine environment |
wet extraction of lipids from a microalgae slurry requires efficient recovery of the solvent. the use of a non-polar solvent such as hexane allows physical recovery of the solvent by centrifugation, avoiding energy intensive distillation of the aqueous slurry. however, the kinetics and mechanisms of centrifugal separat... | centrifugal recovery of solvent after biphasic wet extraction of lipids from a concentrated slurry of nannochloropsis sp. biomass |
minimising the processing volume of downstream unit operations is critical to the scale-up of algal biorefining operations. this requires the ability to process high solids algal biomass, which relies on understanding the rheology of this material. in this work, the characterisation of particle, microstructural and rhe... | rheological manipulation of flocculated algal slurries to achieve high solids processing |
on 7 may 2015, a mw 4.0 earthquake occurred near venus, northeast johnson county, texas, in an area of the bend arch-fort worth basin that reports long-term, high-volume wastewater disposal and has hosted felt earthquakes since 2009. scientists at smu deployed a local seismic network and purchased nearby seismic reflec... | a decade of induced slip on the causative fault of the 2015 mw 4.0 venus earthquake, northeast johnson county, texas |
the role of solar wind density in the cross polar cap potential (cpcp) response under northward interplanetary magnetic field is investigated with observation-based global simulations. a rare event was reported by clauer et al. (2016) during which the ionospheric electric field eisp does not saturate under extreme inte... | the role of solar wind density in cross polar cap potential saturation under northward interplanetary magnetic field |
the electrical conductivity of a cds thin film controlled by grain structures is essential to enhance its photoconductivity to be able to be fit as a window material in cds/cdte heterojunction solar cells. in order to characterize a thin film, electromagnetically, we employed an open cavity resonator with a sub-millime... | sub-thz thermally activated-electrical conductivity of cds thin films |
efficient cell disruption is critical for the recovery of lipids from microalgae for biodiesel production. the rupture of chlorella sp. and navicula sp. by high pressure homogenization (hph) after acidic (hcl, to ph 1.5) and thermal (up to 123 °c) pretreatment was investigated quantitatively (cell counting) and qualita... | the effects of acidic and thermal pretreatment on the mechanical rupture of two industrially relevant microalgae: chlorella sp. and navicula sp. |
complex dielectric variations can address neatly the maturity of organic-rich mudrocks. we, therefore, apply an open hemispherical cavity resonator to measure complex dielectric permitivitties of five thin sections of oil (bakken) shales (with different maturity) of $\sim$ 30 $\mu$m thickness on glass-substrates around... | complex dielectric properties of organic-rich mudrocks as functions of maturity |
under work package 2 (wp2) of theramin, strategic reviews of thermal treatment technologies and european radioactive waste streams for which thermal treatment could bring benefits have been undertaken. this paper presents the outcomes of an international review of inventory information concerning european wastes potent... | strategic study of thermal treatment of european radioactive wastes |
small satellite formation flight in low earth orbit using gnss presents new opportunities for ionospheric remote sensing. next-generation space weather observations require more flexible, lower-cost, multi-point measurement techniques to resolve the temporal and spatial variations of multi-scale space weather phenomena... | satellite formation flying using gnss: hardware-in-the-loop simulation and applications to future multi-scale space weather observations |
it is known that second harmonic generation (shg) during interaction of high power radiowaves with plasmas provides useful diagnostic information such as hydrodynamic evolution, wave absorption processes, flow velocity of the critical layer, and electron temperature. the results of recent experiments that were performe... | observations of pump wave second harmonic generation in stimulated electromagnetic emissions at haarp |
secondary radiation produced during the interaction of high power high frequency (hf) electromagnetic waves with the ionosphere, known as stimulated electromagnetic emissions (sees), have through experimental, theoretical and computer modelling studies evolved into a powerful diagnostic of the modified ionosphere yield... | temporal evolution of second harmonic narrowband stimulated electromagnetic emissions |
the first true common volume observations of the pmse source region with 4 radars are presented in this paper. radar frequencies of 8, 56, 224, and 930 mhz are used in this study. three days of experimental observations at eiscat are presented. numerical simulations of mesospheric dusty/ice plasma associated with the o... | neutral air turbulence in the mesosphere and associated polar mesospheric summer echoes (pmses) |
the rayleigh-taylor (rt) hydrodynamic instability degrade the performance of inertial confinement fusion (icf) experiments. during both the acceleration and deceleration phases of the implosion, the rt instability grows and mixes materials at the interfaces. mitigating the rt instability enables icf implosions to achie... | magnetohydrodynamic simulation comparisons of cylindrical implosion experiments for rayleigh taylor instability |
predicting the responses of marine top predators to dynamic oceanographic conditions requires habitat-based models that sufficiently capture environmental preferences. spatial resolution and temporal averaging of environmental data layers is a key aspect of model construction. the utility of surfaces contemporaneous to... | optimising habitat-based models for wide-ranging marine predators: scale matters |
for the insurance industry, the lack of catastrophe models for emerging markets is hampering efforts to assess risk and provide appropriate insurance schemes for these regions and thus reduce the protection gap. a crucial point in the development of such models is developing an understanding of the insured values. for ... | using a capital stock model to inform insurance cat model building - lessons learned from the development of a fully probabilistic inland flood model for continental china |
the reduction of bycatch, or incidental capture of non-target species in a fishery, is a key objective of ecosystem-based fisheries management (ebfm) and critical to the conservation of many threatened marine species. prediction of bycatch events is therefore of great importance to ebfm efforts. here, bycatch of the oc... | oceanographic determinants of bycatch patterns in the california drift gillnet fishery: building an ebfm tool for sustainable fisheries. |
north texas has experienced a roughly exponential increase in seismicity since 2008. this increase is primarilyattributable to wastewater injection into the ellenburger formation. to our knowledge, there has been no previous comprehensive 10 year analysis comparing regional seismicity with basin-wide injection and inje... | ellenburger wastewater injection and seismicity in north texas |
a catalog of known explosions in a region with tectonic seismicity is valuable for testing methods of blast discrimination and characterization. here, we present a manually reviewed and refined catalog of over 1,100 explosions in the seismically active utah region from 2012/10/01 through 2018/06/30, and use it to asses... | test of a magnitude-based depth discriminant using revised magnitudes and locations of explosions in the utah region, usa |
the cover image is based on the focus article healthy waterways and ecologically sustainable cities in beijing‑tianjin‑hebei urban agglomeration (northern china): challenges and future directions by giri kattel et al., https://doi.org/10.1002/wat2.1500. image | cover image, volume 8, issue 2 |
inhomogeneous transverse flows are generated in plasma that contains a static electric field perpendicular to the magnetic field, which is a configuration that may naturally arise in the boundary layer between plasmas of different characteristics. the magnetized plasma layer with a velocity gradient is shown to be unst... | three-dimensional particle-in-cell simulation of whistler wave generated by strong velocity shear |
advances in machine learning (ml) have the ability to reduce design costs and enhance the design process in hed experiments. ml can use a minimal number of expensive simulations to search the design space efficiently for optimal designs of icf experiments. this work focuses on optimizing graded density inner shells of ... | development of machine learning informed design optimization for double shell capsule graded density inner layer targets |
the mid-latitude radars of the superdarn network routinely observe backscatter from nighttime decameter-scale f region irregularities at latitudes well equatorward of the auroral boundary. this sub-auroral ionospheric scatter (sais) is strongly distinguished from auroral and saps backscatter by low doppler velocities (... | the occurrence of small-scale irregularities in the mid-latitude ionosphere from superdarn hf radar observations |
procedural aspects of compassionate care such as the terminal extubation are understudied. we used machine learning methods to determine factors associated with the decision to extubate the critically ill patient at the end of life, and whether the terminal extubation shortens the dying process. we performed a secondar... | machine learning determination of motivators of terminal extubation during the transition to end-of-life care in intensive care unit |
this paper presents the first joint observations of multi-frequency superdarn (super dual auroral radar network) radar of the heated ionosphere by high-power high-frequency (hf) ground-based radio-waves along with the stimulated electromagnetic emissions (see) measurements. the unique heating experiment design at eisca... | multi-frequency superdarn radar observations of the modulated ionosphere by high-power radio-waves at eiscat |
advances in machine learning provide the ability to leverage data from expensive simulation of high-energy-density experiments to significantly cut down on computational time and costs associated with the search for optimal design of inertial confinement fusion (icf) experiments. machine learning methods can use these ... | coupling radiation-hydrodynamics simulation with machine learning for double shell capsule design optimization |
north texas, including the dallas-fort worth metroplex, has experienced an increase in seismicity rate since 2008 and these events have been linked, to varying degrees of certainty, to wastewater injection in the ordovician ellenburger formation, deposited on top of the crystalline basement. we focus here on local eart... | imaging crustal structure using local earthquake and ambient noise tomography in north texas |
we are investigating the accuracy of theoretical models used to predict the visible, ultraviolet, and infrared spectra, as well as other properties, of product materials ejected from the muzzle of currently fielded systems. recent advances in solid propellants has made the management of muzzle signature (flash) a princ... | theoretical characterizaiton of visual signatures |
this talk will report on new observations of the complex dynamics of wideband stimulated electromagnetic emission (see) generation with simultaneous measurement of field aligned irregularities (fais) near the third electron gyroharmonic frequency by high power high frequency hf radio waves from high frequency active au... | new perspective of stimulated electromagnetic emissions and field aligned irregularities produced during ionospheric heating: towards maximum resonance |
ionospheric ultra-low frequency (ulf) wave signatures in the pc3-5 band (1.7-40.0 mhz) were surveyed using seven years' high time resolution ( 6 s) data from super dual auroral radar network (superdarn) radars at middle, high, and polar latitudes in the northern hemisphere. numerical experiments were conducted to deriv... | survey of ionospheric pc3-5 ulf wave signatures as seen by superdarn radars at middle, high, and polar latitudes |
muscle‑powered movements are limited by the contractile properties of muscles and are sensitive to temperature changes. elastic‑recoil mechanisms can both increase performance and mitigate the effects of temperature on performance. here, we compare feeding movements in two species of plethodontid salamanders, bolitoglo... | extreme performance and functional robustness of movement are linked to muscle architecture: comparing elastic and nonelastic feeding movements in salamanders |
a single-step method for transesterifying and recovering lipids in concentrated slurries (ca 20% w/w solids) of ruptured microalgae is presented. a soluble rhizomucor miehei lipase (rml) was used to directly transesterify the lipids in the marine microalgae nannochloropsis salina. this allowed both triglycerides (tag) ... | conversion and recovery of saponifiable lipids from microalgae using a nonpolar solvent via lipase-assisted extraction |
ionospheric irregularities have been observed in the mid-latitude ionosphere from space weather radar, gps, and satellite data. they are small-scale structures in the plasma density created by various plasma instabilities, which are driven by combinations of plasma drifts, density gradients, and electric fields. ionosp... | modeling the gradient drift and kelvin-helmholtz instabilities as generation mechanisms of mid-latitude ionospheric density irregularities |
subauroral polarization streams (saps) are latitudinally narrow flow channels of large westward plasma drifts in the subauroral ionosphere. the westward drifts are driven by the enhanced poleward electric field and typically occurs during geomagnetically active times. in this study, we make use of the coupled magnetosp... | saps in the 2013 march 17 storm event: simulation results of the coupled lfm-tiegcm-rcm model |
investigation of stimulated radiation, commonly known as stimulated electromagnetic emissions (see), produced by the interaction of high-power, high frequency hf radiowaves with the ionospheric plasma has been a vibrant area of research since the early 1980's. substantial diagnostic information about ionospheric plasma... | recent advances in narrowband stimulated electromagnetic emission nsee investigations at haarp and eiscat |
under the auspices of the theramin project, the geomelt™ in-container vitrification (icv) melter system installed in the national nuclear laboratory (nnl) central laboratory at sellafield, uk, has been used to demonstrate the immobilisation of two surrogate feeds. the streams selected for demonstration were a cementiti... | active demonstration of the thermal treatment of surrogate sludge and surrogate drums using the geomelt™ in container vitrification (icv) melter installed in nnl central laboratory |
gnss-based satellite formation flight in low earth orbit (leo) opens new doors for ionospheric remote sensing. this study presents the newly developed virginia tech formation flying testbed (vtfftb), a multi-constellation gnss-based hardware-in-the-loop (hil) simulation testbed for satellite formation flight, and demon... | satellite formation flight simulation using multi-constellation gnss and applications to ionospheric remote sensing |
initial release version of the remora r package | imos-animaltracking/remora: remora 0.7.1 |
ocean and climate drivers affect the distribution and abundance of marine life on a global scale. marine ecological forecasting seeks to predict how living marine resources respond to physical variability and change, enabling proactive decision‑making to support climate adaptation. however, the skill of ecological fore... | forecast‑ready models to support fisheries' adaptation to global variability and change |
stimulated electromagnetic emission (see) is secondary radiation produced during experiments involving the interaction of high power high frequency (hf) radio waves with the ionosphere. see has been developed into a useful remote sensing tool for the modified ionosphere with potential for aeronomy studies over the past... | stimulated second harmonic emissions during ionospheric heating experiments |
this work aims to model the effect of the august 21, 2017 solar eclipse on the ionosphere using the two-fluid plasma equations (continuity, momentum, and energy for each species) coupled with maxwell's equations. these equations are solved using the finite volume code gkeyll. a uniform ionospheric plasma is initialized... | computational study of electrodynamics and irregularity development in the august 21, 2017 solar eclipse. |
sub-auroral polarization streams (saps) are regions in the sub-auroral ionosphere of lower plasma density and large westward flow (hundreds to thousands of m/s) driven by a poleward electric field. observations have shown that this region is highly structured with density irregularities ranging in spatial scales of ten... | modeling the gradient drift and kelvin-helmholtz instabilities as turbulence generation mechanisms in sub-auroral polarization streams. |
sludge production will continue to increase as new water, sewage and industrial effluent treatment plants are built and existing plants are modified to comply with new, usually more stringent environmental regulations. with the traditional disposal routes coming under pressure it is apparent that better methods of char... | water research sludge special issue |
a common practice in nuclear monitoring is to use waveform correlation as a method of event detection. earthquake waveforms, for example, are correlated with seismic data to detect other similar earthquakes. likewise, explosion waveforms are used to identify other explosions from the same area. however, for monitoring ... | investigating the relationship between waveform correlation and seismic source mechanisms |
this paper summarizes the hybrid simulation results of plasma flow curvature effects on the growth of the kelvin-helmholtz instability (khi). it is found that khi growth rate is higher when the shear flow has a negative initial curvature than linearly sheared initial flow. the growth rate is lower when the initial shea... | hybrid simulation of kelvin-helmholtz instabilities in the presence of radially varying flow |
this work aims to study ionospheric instabilities that may develop significant growth under the conditions of the august 21, 2017 solar eclipse. evaluating the time-scales of several plasma instabilities, it is hypothesized that the gradient-drift (gdi) instability is likely to develop significant growth during the tim... | modeling the gradient drift and temperature gradient instabilities as applied to the august 21, 2017 solar eclipse using two-fluid plasma equations |
ultra-low-frequency (ulf) waves, or magnetic pulsations, are frequently observed by ground-based magnetometers. recently, ulf modulations of global positioning system (gps) total electron content (tec) measurements have also been observed. however, there are few prior reports of simultaneous ulf wave and tec measuremen... | multi-station gps tec and magnetometer observations of ulf waves in antarctica |
the august 17, 2017 solar eclipse provided a unique opportunity to study space weather processes. the umbra causes a decrease in photoionization resulting in a decrease of both ionospheric plasma density and temperature which have the possibility of creating turbulence. ionospheric turbulence may create density irregul... | modeling of space weather processes inside the august 21, 2017 solar eclipse |
porous ceti2o6 brannerite is synthesized with high specific surface area and pore volume and exhibits good uranyl adsorption capacity. the material possesses high portion of mesopores facilitating fast uranyl adsorption. cerium titanates possessing brannerite structure are produced by employing soft and hard templates ... | synthesis of hierarchical mesoporous cerium titanate brannerite and uranyl adsorption properties at ph 3.8 |
subauroral polarization streams (saps) are regions in the subauroral ionosphere with lower plasma density and large westward flow driven by a poleward electric field. density irregularities have been observed to occur in the saps region which affect radio signals by causing phase and amplitude fluctuations. previous wo... | investigating the impact of the latitudinal velocity profile on nonlinear gradient drift instability development in the subauroral ionosphere |
filamentous algae have high potential for wastewater treatment due to their direct uptake of nitrogen and ease of harvesting. theoretically, filamentous algae are best applied upstream to directly remove total ammonia nitrogen (tan = ammonia + ammonium) from wastewater, however their tolerance to toxic free nh3 remains... | ammonia tolerance of filamentous algae oedogonium, spirogyra, tribonema and cladophora, and its implications on wastewater treatment processes |
desiccation impacts a suite of physiological processes in microbes by elevating levels of damaging reactive oxygen species and inducing dna strand breaks. in response to desiccation‑induced stress, microbes have evolved specialized mechanisms to help them survive. here, we performed a 128‑day lab desiccation experiment... | desiccation induces varied responses within a soil bacterial genus |
existing population models of bacteria and phages have most commonly described single well-mixed reactors. whilst crucial to gain an understanding of population dynamics, these models are not directly applicable to scenarios requiring multi-reactor models. using standard approaches we have formulated these models to de... | simulation of phage dynamics in multi-reactor models of complex wastewater treatment systems |
a newly developed three-dimensional electrostatic fluid model solving continuity and current closure equations aims to study phenomena that generate ionospheric turbulence. the model is spatially discretized using a pseudo-spectral method with full fourier basis functions and evolved in time using a four-stage, fourth-... | nonlinear three-dimensional simulations of the gradient drift and secondary kelvin–helmholtz instabilities in ionospheric plasma clouds |
high-resolution earthquake locations and fault plane solutions are combined with information on subsurface geology, fault structure, well data, and 3d pore pressure modeling to provide further insight into the relationship between fluid migration at depth and modern seismicity in north texas. since 2008, the usgs has r... | comparison study between north texas earthquake sequences from 2008-2015 |
in january 2015, a pair of m3.6 earthquakes and numerous m3+ occurred along the border of irving and dallas, texas, in a heavily populated portion of the dallas-fort worth metropolitan area. the irving-dallas swarm occurs at the eastern edge of the fort worth (barnett shale) basin, an active shale gas production area a... | characterization of the 2015 dallas-irving earthquake sequence |
the performance of individual reverse osmosis (ro) systems varies significantly with different contaminants of emerging concern (cecs). as such, log reduction values (lrvs) of the concentration of these chemicals cannot be arbitrarily credited in water treatment and water recycling. this study looks to present an appro... | demonstrating removal credits for contaminants of emerging concern in recycled water through a reverse osmosis barrier-a predictive framework |
pooled crispr-cas9 knock out screens provide a valuable addition to the methods available for novel drug target identification and validation. however, where gene editing is targeted to amplified loci, the resulting multiple dna cleavage events can be a cause of false positive hit identification. the generation of nucl... | dual direction crispr transcriptional regulation screening uncovers gene networks driving drug resistance |
summary the evolution of visual systems is guided by visual requirements imposed by the environment, the size of the animal's eyes, and physical limitations imposed by the resolution‑sensitivity trade‑off. given a particular eye surface area, resolution and sensitivity cannot be simultaneously maximized: gains in resol... | the relationship between microhabitat use, allometry and functional variation in the eyes of hawaiian megalagrion damselflies |
stimulated electromagnetic emission (see) is secondary radiation produced during experiments involving the interaction of high power high frequency (hf) radio waves with the ionosphere. see has been a vibrant area of investigation for the past four decades and see has been developed into an important remote sensing too... | recent advances in stimulated electromagnetic emission investigations |
microbes are essential for the functioning of all ecosystems. as global warming and anthropogenic pollution threaten ecosystems and microbial communities, it is critical to understand how microbes will respond. here we investigated the climate response of sphingomonas, a widespread bacterial genus that can break down p... | distribution of sphingomonas across a southern california climate gradient after reciprocal transplantation |
stimulated electromagnetic emission (see) is secondary radiation produced during experiments involving the interaction of high power high frequency (hf) radio waves with the ionosphere. see has been a vibrant area of investigation for the past four decades and see has been developed into an important remote sensing too... | recent advances in stimulated electromagnetic emission investigations |
a recent study by koper et al. (2016) found that the difference between local magnitude (ml) and coda duration magnitude (mc) successfully distinguished shallow seismic events (mining blasts, mining-induced seismicity, and shallow tectonic earthquakes) from deeper seismic events (tectonic earthquakes) in the utah regio... | on the performance of ml-mc as a depth discriminant for small seismic events recorded at local distances in yellowstone, oklahoma, and italy |
scintillation and total electron content (tec) are the two major examples of the top-side ionospheric parameters that are recorded differently by most global positioning system (gps) receivers. the new gps sensor created by the atmospheric and space technology research associates (astra), cornell university, and the un... | tec and roti measurements from a new gps receiver at bowen university, nigeria |
flooding is the driving cause of economic loss from natural catastrophes in china due to a combination of significant flood hazard and fast-paced growth in flood-exposed areas. this has been brought into focus in recent years, with significant flood events occurring annually. for example, the summer of 2016 brought the... | a probabilistic flood model for continental china |
knowledge of fisheries impacts, past and present, is essential for understanding the ecology and conservation of seabirds, but in a rapidly changing world, knowledge and research directions require updating. in this introduction and in the articles in this themed set "impacts of fishing on seabirds", we update our unde... | an overview of the impacts of fishing on seabirds, including identifying future research directions |
in this paper, we discuss a set of novel initiatives aimed at educating and training the next generation of quantum engineers via a combination of conventional coursework, project based learning and institutional partnerships. toward this end, we discuss the role of our newly - designed laboratory experiments, together... | toward a quantum-enabled workforce: curriculum design, project based learning, and institutional partnerships as integrated methodologies |
ozonation is an effective barrier for removing a wide spectrum of organic chemicals of concern (coc) in a water treatment process. in this study, bench- and full-scale tests were conducted on a secondary treated effluent at the eastern treatment plant (etp) of melbourne water to probe the performance of ozonation in re... | a chemical credit framework to predict the removal performance of organic chemicals of concern from water through an ozonation process |
the care ii mission was launched from andoya, norway, in september 2015. the primary objective of care ii was to study hypersonic expansion of dust and molecular clouds in the presence of an ambient ionosphere. this flight had a full set of plasma diagnostics to measure the charged dust density, the electron and ion de... | the space plasma physics of the glowing dust ball from the care ii rocket experiment |
space weather processes act as drivers for the earth's thermosphere and ionosphere, which impact a wide range of modern technology (e.g. satellite communication, navigation systems, power grids). the dynamics and coupling between various ionospheric phenomena are not yet fully understood due to a lack of robust observa... | gnss-based hardware-in-the-loop simulation of satellite formation flight: an incubator for future multi-scale space weather observations |
in the past china has experienced frequent and costly flooding. major events like the 1998 floods in the yangtze river basin have led to massive investments into flood risk reduction measures over the past two decades. yet, economic flood losses in 2016 still amounted to 20bn usd (munich re, 2017). there has been subst... | china historical flood loss database: development and use for insurance applications |
use of high frequency (hf) heating experiments has been extended in recent years as a useful methodology for plasma physicists wishing to remotely study the properties and behavior of the ionosphere as well as nonlinear plasma processes. our recent work using high latitude heating experiments has lead to several import... | investigation of third gyro-harmonic heating at haarp using stimulated radio emissions, the muir and superdarn radars |
interaction of a high power, high frequency (hf) electromagnetic wave with ionospheric plasma produces secondary radiation, due to nonlinear processes, known as stimulated electromagnetic emissions (see). the primary nonlinear process involved being parametric decay instabilities. see which exists outside 1 khz of the ... | observations of second harmonic stimulated electromagnetic emission generation during ionospheric heating |
thermospheric neutral wind is one of the drivers that change the behaviour of ionosphere by creating dynamo electric field that can influence plasma instabilities (kelley, 2009) which in turn inhibit radio wave propagation through the region. the impact of the thermospheric winds over equatorial africa ionosphere is ju... | thermospheric wind observation using fabry-perot interferometers at arecibo and nigeria |
larization front (df) is investigated with a two-dimensional electromagnetic particle-in-cell (pic) model. the df is characterized by a boundary layer with thickness on the kinetic scale, in which ions can be regarded as unmagnetized and electrons magnetized in the time scale of the intermediate-frequency waves of inte... | electron-ion hybrid instability in a quasi-static near-earth dipolarization front |
spatial management is widely applied to manage and conserve natural resources. many applied spatial management schemes are static in space and time (e.g. marine protected areas and national parks) and are unable to accommodate the movements of highly mobile species. recently, dynamic management - a subset of spatial ma... | managing the ocean in real-time: ecological forecasts for dynamic management |
the interaction of high power hf electromagnetic waves with the ionosphere produces secondary radiation known as stimulated electromagnetic emissions (sees). sees provide important diagnostic information such as electron temperature, ion mass, etc. sees which exist within 100 khz and 1 khz of the pump wave frequency ar... | observations of second harmonic generation in stimulated electromagnetic emissions during ionospheric heating |
this work describes a new computational model used to study the nonlinear development of small spatial scale irregularities in the mid-latitude sub-auroral ionosphere. such irregularities have been found in observational data at spatial scales of hundreds down to tens of meters. these irregularities impact gnss and spa... | nonlinear computational modeling of small scale irregularities in the midlatitude sub-auroral ionosphere |
imf orientation values and plasma number densities are surveyed for three spacecraft, mms, themis and cluster. the 4.5 seconds of data survey of mms and the corresponding times scales of cluster and themis are compared with 2 seconds of pic em relativistic code step time. four imf orientations are considered in 3d in t... | global comparison of mms, cluster and themis data on january, 4th 2017, with pic em code in the vicinity of the earth's magnetosphere. |
since october 2008, the fort worth basin in north texas has experienced over 30 magnitude (m) 3.0+ earthquakes, including one m4.0. five named earthquake sequences have been recorded by local seismic networks: dfw airport, cleburne-johnson county, azle, irving-dallas, and venus-johnson county. earthquakes have occurred... | one basin, one stress regime, one orientation of seismogenic basement faults, variable spatio-temporal slip histories: lessons from fort worth basin induced earthquake sequences |
the role of solar wind density in the cross polar cap potential (cpcp) response under northward interplanetary magnetic field (imf) is investigated with observation-based global simulations. a rare event was reported by tet{clauer16} during which the ionospheric electric field eisp does not saturate under extreme inter... | the role of solar wind density in the cross polar cap potential saturation under northward interplanetary magnetic field |
in this study of flow curvature effects, a two-dimensional hybrid model is used to simulate the kelvin-helmholtz instability (khi). the hybrid model treats the ions as particles, and electrons as massless fluid. pressure and resistivity are assumed as isotropic. a classical configuration for the study of khi is investi... | 2-d hybrid model to study flow curvature effect on low frequency plasma turbulence |
we implement a technique to characterize electromagnetic properties at frequencies 100 to 165 ghz (3 cm$^{-1}$ to 4.95 cm$^{-1}$) of oriented montmorillionite samples using an open cavity resonator connected to a sub-millimeter wave vna (vector network analyzer). we measured dielectric constants perpendicular to the be... | sub-thz complex dielectric constants of montmorillionite clay thin samples with na$^{+}$/ca$^{++}$-ions |
so-called polar mesospheric winter echoes (pmwe) are radar echoes observed during winter at altitudes around 50-80 km and are much weaker than their pmse (polar mesospheric summer echoes) counterpart. unlike pmse, pmwe are less studied and understood. breaking of gravity waves and the associated turbulence are proposed... | remote sensing of mesospheric dust layers using active modulation of pmwe by high-power radio-waves |
we investigate seismicity within 8 km2 of a longwall coal mine located in central utah (hereafter referred to as mine a). in the process of longwall coal mining, a mechanical shearer removes coal from the face of a long seam. as the shearer advances, the roof of the newly formed void is controllably collapsed, which re... | high-precision relative relocation of seismicity near a central utah mine |
dipolarization fronts (dfs) are dipolarized magnetic field embedded in the earthward propagating bursty bulk flows (bbfs), which separates the hot, tenuous high-speed flow from the cold, dense, and slowly convecting surrounding plasma [runov et al. 2011]. broadband fluctuations have been observed at dfs including the e... | particle-in-cell simulation of dipolarization front associated whistlers |
we present high-resolution relative earthquake relocations derived using differential time data from waveform cross-correlation and first motion fault plane solutions to characterize the 2015 m4.0 venus, tx, earthquake sequence. on 7 may 2015, a m4.0 earthquake occurred in johnson county, tx, south of the dallas-fort w... | characterization of the 2015 m4.0 venus, texas, earthquake sequence using locally recorded seismic data |
ultra-low frequency (ulf: 1 mhz-10 hz) waves are believed to play an important role in the energization and transport of plasma within the magnetosphere-ionosphere system, as well as the transfer of energy from the solar wind. most previous statistical studies of ionospheric ulf waves using super dual auroral radar net... | survey of pc3-5 ulf velocity oscillations in superdarn themis-mode data: occurrence statistics and driving mechanisms |
the fracture properties of as-cast tivnbta, a refractory high-entropy alloy (rhea), were investigated using four-point bending tests from -139c to 20c under a strain-rate of 10-3 s-1. from those tests and fractography, the conditional fracture toughness values and the brittle-to-ductile transition temperature were obta... | on the brittle-to-ductile transition of the as-cast tivnbta refractory high-entropy alloy |
dynamic thin film interferometry is a technique used to non-invasively characterize the thickness of thin liquid films. recovering the underlying thickness from the captured interferograms, unconditionally and automatically is still an open problem. here we report a compact setup employing a snapshot hyperspectral came... | hyperspectral imaging for dynamic thin film interferometry |
over 40 metric tons of meteoric dust enters the earth's atmosphere every day. this dust settles and creates natural dust layers in the altitude ranges between 80 and 100 kilometers which spans the earth's upper mesosphere to lower thermosphere. the dust layers in the lower atmosphere have a great impact on climate, hum... | on meteoric dust particles in the near-earth space environment |
a set of experiments was carried out in june, 2021 at the high-frequency active auroral research program (haarp) facility in gakona, alaska. the objective of our experiments was to investigate the relationship between the power and frequency of a wave transmitted from an ionospheric heater and the strength of the resul... | power-frequency experiment at haarp with superdarn and see observations |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.