cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dynamical and Thermodynamical Causes of Large-Scale Changes in the Hydrological Cycle over North America in Response to Global Warming
Creators: name: Seager, Richard
name: Neelin, J. David
name: Simpson, Isla R.
name: Liu, Haibo
name: Henderson, Naomi L.
name: Shaw, Tiffany Ann
name: Kushnir, Yochanan
name: Ting, Mingfang
name: Cook, Benjamin I.
Publisher: name: Columbia University
Year: 2014
Subjects: Hydrologic cycle
Thermodynamics
Climatic changes
Global warming

description: The mechanisms of model-projected atmospheric moisture budget change across North America are examined in simulations conducted with 22 models from phase 5 of the Coupled Model Intercomparison Project. Modern-day model budgets are validated against the European Centre for Medium-Range Weather Forecasts Interim Re-Analysis. In the winter half year transient eddies converge moisture across the continent while the mean flow wets the west from central California northward and dries the southwest. In the summer half year there is widespread mean flow moisture divergence across the west and convergence over the Great Plains that is offset by transient eddy divergence. In the winter half year the models project drying for the southwest and wetting to the north. Changes in the mean flow moisture convergence are largely responsible across the west but intensified transient eddy moisture convergence wets the northeast. In the summer half year widespread declines in precipitation minus evaporation (P-E) are supported by mean flow moisture divergence across the west and transient eddy divergence in the Great Plains. The changes in mean flow convergence are related to increases in specific humidity but also depend on changes in the mean flow including increased low-level divergence in the U.S. Southwest and a zonally varying wave that wets the North American west and east coasts in winter and dries the U.S. Southwest. Increased transient eddy fluxes occur even as low-level eddy activity weakens and arise from strengthened humidity gradients. A full explanation of North American hydroclimate changes will require ex- planation of mean and transient circulation changes and the coupling between the moisture and circulation fields.
title: System of technical diagnostics of the processes of slagaging and contamination of heating surfaces of pulverized coal steam power boilers
Creators: name: Zagorodniy, I.V.
Publisher: name: Scientific Research Centre "MachineStructure"
Year: 2019

description: The development of a system for the technical diagnosis of slagging processes and contamination of the heating surfaces of coal-fired steam boilers is presented, which operates online based on the interpretation of the standard information of the automatic process control system and scientifically based algorithms for processing balance equations to evaluate the thermal efficiency of radiation, semi-radiation and convective heating surfaces. The system is implemented at the level of algorithmic and software in the programming language C #, which is built into the current system of the ACS of the boiler unit. The project aims to increase the reliability and efficiency of steam boilers by quickly maintaining heating surfaces in an operational clean state, ensuring optimal performance characteristics of the main technological equipment.
Causes of increasing aridification of the Mediterranean region in response to rising greenhouse gases
Creators: name: Seager, Richard
name: Liu, Haibo
name: Henderson, Naomi L.
name: Simpson, Isla R.
name: Kelley, Colin Patrick
name: Shaw, Tiffany Ann
name: Kushnir, Yochanan
name: Ting, Mingfang
Publisher: name: Columbia University
Year: 2014
Subjects: Hydrologic cycle
Climatology
Climatic changes
Greenhouse gases

description: The hydrological cycle in the Mediterranean region, as well as its change over the coming decades, is investigated using the Interim European Centre for Medium-Range Weather Forecasts Re-Analysis (ERA-Interim) and phase 5 of the Coupled Model Intercomparison Project (CMIP5) historical simulations and projections of the coming decades. The Mediterranean land regions have positive precipitation minus evaporation, P-E, in winter and negative P-E in summer. According to ERA-Interim, positive P-E over land in winter is sustained by transient eddy moisture convergence and opposed by mean flow moisture divergence. Dry mean flow advection is important for opposing the transient eddy moisture flux convergence in the winter half year and the mass divergent mean flow is a prime cause of negative P-E in the summer half year. These features are well reproduced in the CMIP5 ensemble. The models predict reduced P-E over the Mediterranean region in the future year-round. For both land and sea, a common cause of drying is increased mean flow moisture divergence. Changes in transient eddy moisture fluxes largely act diffusively and cause drying over the sea and moistening over many land areas to the north in winter and drying over western land areas and moistening over the eastern sea in summer. Increased mean flow moisture divergence is caused by both the increase in atmospheric humidity in a region of mean flow divergence and strengthening of the mass divergence. Increased mass divergence is related to increased high pressure over the central Mediterranean in winter and over the Atlantic and northern Europe in summer, which favors subsidence and low-level divergence over the Mediterranean region.
Three Decades and Counting: HIV Service Provision in Outpatient Mental Health Settings
Creators: name: McKinnon, Karen M.
name: Satriano, James J.
name: Alves Bradford, Jean-Marie
name: Erby, Whitney
name: Jaafar, Fatima J.
name: Simonen, Elizabeth H.
name: Gozzo, Izabella S.
name: Robles Huang, Amy N.
name: Sposito, Jonah S.
name: Tao, Ziyi
name: Zakoian, Martin J.
name: McKinnon, Alma Zurita
name: Cournos, Francine
Publisher: name: Columbia University
Year: 2020
Subjects: Mental health services
Community mental health services
Psychiatric hospitals--Outpatient services
HIV infections—Prevention
HIV-positive persons--Care

description: OBJECTIVE: People with serious mental illness in the United States have higher human immunodeficiency virus (HIV) infection rates than the general U.S. population. This study aimed to assess delivery of HIV services in New York State’s outpatient mental health programs. Greater access would enhance efforts to improve HIV prevention and care outcomes. METHODS: The authors surveyed directors of licensed outpatient mental health care programs statewide to investigate their HIV service delivery. Data were compared with surveys conducted in 1997 and 2004 in order to examine differences in services between geographic regions and time periods. RESULTS: Outpatient mental health programs have improved in the volume and range of HIV services offered, but their provision of pre-exposure prophylaxis, condoms, HIV testing, and HIV antiretroviral treatment monitoring has lagged. CONCLUSIONS: New York’s initiative to end the HIV epidemic is not optimized to reach people with serious mental illness in settings designed for their care.
Low Rates of HIV Testing Among Adults With Severe Mental Illness Receiving Care in Community Mental Health Settings
Creators: name: Mangurian, Christina
name: Cournos, Francine
name: Schillinger, Dean
name: Vittinghoff, Eric
name: Creasman, Jennifer M.
name: Lee, Bernard
name: Knapp, Penelope
name: Fuentes-Afflick, Elena
name: Dilley, James W.
Publisher: name: Columbia University
Year: 2017
Subjects: Mental illness
Mental health services
Community mental health services
HIV (Viruses)--Testing
HIV infections—Prevention

description: OBJECTIVE: This research aimed to characterize HIV testing rates among Medicaid recipients with severe mental illness who received public specialty mental health services. METHODS: This retrospective cohort study examined California Medicaid records from October 1, 2010, to September 30, 2011 (N=56,895). Study participants were between age 18 and 67, utilized specialty mental health care services, were prescribed antipsychotic medications, and were not dually eligible for Medicare. Adjusted Poisson regression models were used to estimate the overall effects of predictor variables on HIV testing prevalence. RESULTS: During the study period, 6.7% of people with severe mental illness received HIV testing. Men were 32% less likely to be tested for HIV than women (p,.001). Compared with whites, Asians/Pacific Islanders were 53% less likely and blacks were 82% more likely to be tested (p,.001). Those with comorbid drug or alcohol use disorders were more likely to be tested than those without such disorders (p,.001). Utilization of non-psychiatric medical care was the strongest predictor of HIV testing (p,.001). CONCLUSIONS: Most adults with severe mental illness receiving public specialty mental health services were not tested for HIV during a one-year period. Public health administrators must prioritize HIV testing for early identification of HIV infection and prevention of HIV transmission.
On the field theory expansion of superstring five point amplitudes
Creators: name: Boels, Rutger H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A simple recursive expansion algorithm for the integrals of tree level superstring five point amplitudes in a flat background is given which reduces the expansion to simple symbol(ic) manipulations. This approach can be used for instance to prove the expansion is maximally transcendental to all orders and to verify several conjectures made in recent literature to high order. Closed string amplitudes follow from these open string results by the KLT relations. To obtain insight into these results in particular the maximal R-symmetry violating amplitudes (MRV) in type IIB superstring theory are studied. The obtained expansion of the open string amplitudes reduces the analysis for MRV amplitudes to the classification of completely symmetric polynomials of the external legs, up to momentum conservation. Using Molien's theorem as a counting tool this problem is solved by constructing an explicit nine element basis for this class. This theorem may be of wider interest: as is illustrated at higher points it can be used to calculate dimensions of polynomials of external momenta invariant under any finite group for in principle any number of legs, up to momentum conservation.
description: 21 pages, explicit results included in submission. v3: rewritten for clarity, example Mathematica implementation added, typos corrected
Whither the 100th meridian? The once and future physical and human geography of America's arid-humid divide. Part I: the story so far
Creators: name: Seager, Richard
name: Lis, Nathan
name: Feldman, Jamie
name: Ting, Mingfang
name: Williams, A. Park
name: Nakamura, Jennifer A.
name: Liu, Haibo
name: Henderson, Naomi L.
Publisher: name: Columbia University
Year: 2018
Subjects: Arid regions
Crops and climate
Climate and civilization
Hydrology
Climatology

description: John Wesley Powell, in the nineteenth century, introduced the notion that the 100th meridian divides the North American continent into arid western regions and humid eastern regions. This concept remains firmly fixed in the national imagination. It is reexamined in terms of climate, hydrology, vegetation, land use, settlement, and the agricultural economy. It is shown there is a stark east–west gradient in aridity roughly at the 100th meridian that is well expressed in hydroclimate, soil moisture, and ‘‘potential vegetation.’’ The gradient arises from atmospheric circulations and moisture transports. In win- ter, the arid regions west of the 100th meridian are shielded from Pacific storm- related precipitation and are too far west to benefit from Atlantic storms. In summer, the southerly flow on the western flank of the North Atlantic sub- tropical high has a westerly component over the western plains, bringing air from the interior southwest, but it also brings air from the Gulf of Mexico over the eastern plains, generating a west–east moisture transport and pre- cipitation gradient. The aridity gradient is realized in soil moisture and a west-to-east transition from shortgrass to tallgrass prairie. The gradient is sharp in terms of greater fractional coverage of developed land east of the 100th meridian than to the west. Farms are fewer but larger west of the meridian, reflective of lower land productivity. Wheat and corn cultivation preferentially occur west and east of the 100th meridian, respectively. The 100th meridian is a very real arid–humid divide in the physical climate and landscape, and this has exerted a powerful influence on human settlement and agricultural development.
Superconductivity of Mg/MgO interface formed by shock-wave pressure
Creators: name: Sidorov, N. S.
name: Palnichenko, A. V.
name: Shakhrai, D. V.
name: Avdonin, V. V.
name: Vyaselev, O. M.
name: Khasanov, S. S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A mixture of Mg and MgO has been subjected to a shock-wave pressure of 170 kbar. The ac susceptibility measurements of the product has revealed a metastable superconductivity with Tc=30 K, characterized by glassy dynamics of the shielding currents below Tc. Comparison of the ac susceptibility and the dc magnetization measurements infers that the superconductivity arises within the interfacial layer formed between metallic Mg and its oxide due to the shock-wave treatment.
title: On the issue of applying the 3D printing method to the repair of vane pumps
Creators: name: Orekh, D.V.
name: Zinoveva, A.V.
name: Safrygin, D.S.
name: Ovsyannikov, A.Yu.
Publisher: name: Scientific Research Centre "MachineStructure"
Year: 2019

description: The article discusses the possibility of using 3D printing in the process of repairing a pump and pump units. The authors provide an analysis of static and dynamic loads that affect the operation of the shaft and impeller of the pump. The article analyzes the possibility of using parts made of ABS plastic in blade machines.
A new perspective on MOND
Creators: name: Bugg, D. V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Physics (physics.gen-ph)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A novel interpretation of MOND is presented. For galactic data, in addition to Newtonian acceleration, there is an attractive acceleration peaking at Milgrom's parameter a_0. The peak lies within experimental error where a_0 = cH_0/2π; H_0 is the present-time value of the Hubble constant and c the velocity of light. The physical interpretation of this relation and its connection to Dark Energy are discussed.
description: 16 pages, 3 figures, substantial overlap with arXiv:1211.1625; one arithmetic correction made, subsection 4.1 rewritten; accepted for publication by the Canadian Journal of Physics
Whither the 100th meridian? The once and future physical and human geography of America's arid-humid divide. Part II: The Meridian Moves East
Creators: name: Seager, Richard
name: Feldman, Jamie
name: Lis, Nathan
name: Ting, Mingfang
name: Williams, A. Park
name: Nakamura, Jennifer A.
name: Liu, Haibo
name: Henderson, Naomi L.
Publisher: name: Columbia University
Year: 2018
Subjects: Arid regions
Crops and climate
Climate and civilization
Hydrology
Climatology

description: The 100th meridian bisects the Great Plains of the United States and effectively divides the continent into more arid western and less arid eastern halves and is well expressed in terms of vegetation, land hydrology, crops, and the farm economy. Here, it is considered how this arid–humid divide will change in intensity and location during the current century under rising greenhouse gases. It is first shown that state-of-the-art climate models from phase 5 of the Coupled Model Intercomparison Project generally underestimate the degree of aridity of the United States and simulate an arid–humid divide that is too diffuse. These biases are traced to excessive precipitation and evapotranspiration and inadequate blocking of eastward moisture flux by the Pacific coastal ranges and Rockies. Bias-corrected future projections are developed that modify observationally based measures of aridity by the model-projected fractional changes in aridity. Aridity increases across the United States, and the aridity gradient weakens. The main contributor to the changes is rising potential evapotranspiration, while changes in precipitation working alone increase aridity across the southern and decrease across the northern United States. The ‘‘effective 100th meridian’’ moves to the east as the century progresses. In the current farm economy, farm size and percent of county under rangelands increase and percent of cropland under corn decreases as aridity increases. Statistical relations between these quantities and the bias- corrected aridity projections suggest that, all else being equal (which it will not be), adjustment to changing environmental conditions would cause farm size and rangeland area to increase across the plains and percent of cropland under corn to decrease in the northern plains as the century advances.
On the role of tropical ocean forcing of the persistent North America west coast ridge of winter 2013/14
Creators: name: Seager, Richard
name: Henderson, Naomi L.
Publisher: name: Columbia University
Year: 2016
Subjects: Droughts
Climatic changes
Ocean temperature
Ocean-atmosphere interaction

description: The causes of the high pressure ridge at the North American west coast during winter 2013/14, the driest winter of the recent California drought, are examined. The ridge was part of an atmosphere–ocean state that included anomalies, defined relative to a 1979–2014 mean, of circulation across the Northern Hemisphere, warm sea surface temperatures (SSTs) in the tropical western and northeastern Pacific and the south Indian Ocean, and cool SSTs in the central tropical Pacific. The SST anomalies differ sufficiently between datasets that, when used to force atmosphere models, the simulated circulation anomalies vary notably in realism. Recognizing uncertainty in the SST field, the authors use idealized tropical SST anomaly experiments to identify an optimal combination of SST anomalies that forces a circulation re- sponse that best matches observations. The optimal SST pattern resembles that observed but the associ- ated circulation pattern is much weaker than observed, suggesting an important but limited role for ocean forcing. Analysis of the equilibrium and transient upper-troposphere vorticity balance indicates that the SST-forced component of the ridge arose as a summed effect of Rossby waves forced by SST anomalies across the tropical Indo-Pacific oceans and drives upper-troposphere convergence and subsidence at the west coast. The ridge, in observations and model, is associated with northward and southward diversion of storms. The results suggest that tropical Indo-Pacific ocean SSTs helped force the west coast ridge and drought of winter 2013/14.
Is there a role for human-induced climate change in the precipitation decline that drove the California drought?
Creators: name: Seager, Richard
name: Henderson, Naomi L.
name: Cane, Mark A.
name: Liu, Haibo
name: Nakamura, Jennifer A.
Publisher: name: Columbia University
Year: 2017
Subjects: Droughts
Climatic changes
Ocean temperature
Atmospheric circulation

description: The recent California drought was associated with a persistent ridge at the west coast of North America that has been associated with, in part, forcing from warm SST anomalies in the tropical west Pacific. Here it is considered whether there is a role for human-induced climate change in favoring such a west coast ridge. The models from phase 5 of the Coupled Model Intercomparison Project do not support such a case either in terms of a shift in the mean circulation or in variance that would favor increased intensity or frequency of ridges. The models also do not support shifts toward a drier mean climate or more frequent or intense dry winters or to tropical SST states that would favor west coast ridges. However, reanalyses do show that over the last century there has been a trend toward circulation anomalies over the Pacific–North American domain akin to those during the height of the California drought. The trend has been associated with a trend toward preferential warming of the Indo–west Pacific, an arrangement of tropical oceans and Pacific–North American circulation similar to that during winter 2013/14, the driest winter of the California drought. These height trends, how- ever, are not reproduced in SST-forced atmosphere model ensembles. In contrast, idealized atmosphere modeling suggests that increased tropical Indo-Pacific zonal SST gradients are optimal for forcing height trends that favor a west coast ridge. These results allow a tenuous case for human-driven climate change driving increased gradients and favoring the west coast ridge, but observational data are not sufficiently accurate to confirm or reject this case.
title: Analysis of the effectiveness of the NSh-32 in road construction equipment
Creators: name: Orekh, D.V.
name: Zinoveva, A.V.
name: Ovsyannikov, A.Yu.
Publisher: name: Scientific Research Centre "MachineStructure"
Year: 2019

description: The article discusses the appropriateness of using a gear pump in a hydraulic control system for a dozer blade. The main parameters of the hydraulic circuit were calculated according to the obtained parameters; an axial piston pump was developed. An analysis of weight and size indicators was made and the corresponding conclusions were drawn.
title: On the issue of building protection of an induction motor from internal asymmetry and internal short circuits
Creators: name: Pronina, A.K.
name: Putilin, K.P.
Publisher: name: Scientific Research Centre "MachineStructure"
Year: 2019

description: Due to a violation of the insulation of electrical machines, an asymmetry appears, which can be detected by monitoring phase insulation according to the principle of asymmetry of the capacitive resistances of the phase windings relative to the machine body with an isolated neutral. The proposed method can be used to identify any damage in the form of touching the body with a winding in order to quickly diagnose and disconnect the motor from the network. Identification of internal short circuits will increase the efficiency of operation of protection against short-circuit arc short-circuited windings inside the machine.
Uncovering quasi-degenerate Kaluza-Klein Electro-Weak gauge bosons with top asymmetries at the LHC
Creators: name: Accomando, E.
name: Mimasu, K.
name: Moretti, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: By exploiting the correlation between charge and spin polarisation asymmetries in t-tbar, we show that combining the two observables could identify the presence of quasi-degenerate states in a resonant signal at the LHC. As an example, we investigate experimental signatures emerging in top-antitop final states in the context of a model where the Standard Model Electro-Weak sector is allowed to propagate in large extra--dimensions of TeV^-1 size while the colour sector is localised. Assuming current experimantal constraints from the 7 and 8 TeV runs and taking into account the estimated top (anti-top) reconstruction efficiencies, we find that the 14 TeV upgraded LHC with the planned integrated luminosity L=100 fb^-1 could access these quasi-degenerate multiple resonances and explore for the first time the rich phenomenology in the asymmetry observables. The main outcome would be having measurable quantities, complementary to the usual total and differential cross sections, capable of distiguishing a quasi-degenerate multiply resonant spectrum from a `standard' single resonance that could present a similar signal in a bump hunt analysis.
description: 26 pages, 8 figures
Stability of Underwater Periodic Locomotion
Creators: name: Jing, Fangxu
name: Kanso, Eva
Publisher: name: arXiv
Year: 2013
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Most aquatic vertebrates swim by lateral flapping of their bodies and caudal fins. While much effort has been devoted to understanding the flapping kinematics and its influence on the swimming efficiency, little is known about the stability (or lack of) of periodic swimming. It is believed that stability limits maneuverability and body designs/flapping motions that are adapted for stable swimming are not suitable for high maneuverability and vice versa. In this paper, we consider a simplified model of a planar elliptic body undergoing prescribed periodic heaving and pitching in potential flow. We show that periodic locomotion can be achieved due to the resulting hydrodynamic forces, and its value depends on several parameters including the aspect ratio of the body, the amplitudes and phases of the prescribed flapping. We obtain closed-form solutions for the locomotion and efficiency for small flapping amplitudes, and numerical results for finite flapping amplitudes. We then study the stability of the (finite amplitude flapping) periodic locomotion using Floquet theory. We find that stability depends nonlinearly on all parameters. Interesting trends of switching between stable and unstable motions emerge and evolve as we continuously vary the parameter values. This suggests that, for live organisms that control their flapping motion, maneuverability and stability need not be thought of as disjoint properties, rather the organism may manipulate its motion in favor of one or the other depending on the task at hand.
description: 15 pages, 15 figures
Causes of the 2011-14 California drought
Creators: name: Seager, Richard
name: Hoerling, Martin P.
name: Schubert, Siegfried D.
name: Wang, Hailan
name: Lyon, Bradfield
name: Kumar, Arun
name: Nakamura, Jennifer A.
name: Henderson, Naomi L.
Publisher: name: Columbia University
Year: 2015
Subjects: Droughts
Climatic changes
Ocean temperature

description: The causes of the California drought during November–April winters of 2011/12–2013/14 are analyzed using observations and ensemble simulations with seven atmosphere models forced by observed SSTs. Historically, dry California winters are most commonly associated with a ridge off the west coast but no obvious SST forcing. Wet winters are most commonly associated with a trough off the west coast and an El Niño event. These attributes of dry and wet winters are captured by many of the seven models. According to the models, SST forcing can explain up to a third of California winter precipitation variance. SST forcing was key to sustaining a high pressure ridge over the west coast and suppressing precipitation during the three winters. In 2011/12 this was a response to a La Niña event, whereas in 2012/13 and 2013/14 it appears related to a warm west–cool east tropical Pacific SST pattern. All models contain a mode of variability linking such tropical Pacific SST anomalies to a wave train with a ridge off the North American west coast. This mode explains less variance than ENSO and Pacific decadal variability, and its importance in 2012/13 and 2013/14 was unusual. The models from phase 5 of CMIP (CMIP5) project rising greenhouse gases to cause changes in California all-winter precipitation that are very small compared to recent drought anomalies. However, a long-term warming trend likely contributed to surface moisture deficits during the drought. As such, the precipitation deficit during the drought was dominated by natural variability, a conclusion framed by discussion of differences between observed and modeled tropical SST trends.
Small non-Gaussianity and dipole asymmetry in the CMB
Creators: name: Wang, Lingfei
name: Mazumdar, Anupam
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we provide a prescription for obtaining a small non-Gaussianity and the observed dipole asymmetry in the cosmic microwave background radiation. The observations inevitably lead to multi-field inflationary dynamics, where each field can create positive or negative large non-Gaussianity, resulting a fine cancellation but with an observable imprint on the hemispherical asymmetry. We discuss this possibility within a simple slow-roll scenario and find that it is hard to explain the observed dipole asymmetry. We briefly discuss some speculative scenarios where one can explain dipole asymmetry.
description: 4 pages, 1 figure, revision accepted by PRD
Integrating multiscale static and dynamic reservoir data to predict well productivity for risk reduction
Creators: name: Sirju, Clive
Publisher: name: University of Leicester
Year: 2021
Subjects: Uncategorized

description: The deliverability of a hydrocarbon bearing reservoir is assessed in part by quantifying the reservoir permeability. This research investigates an alternative approach to improve the match between different permeability scales especially welltest and core and log permeabilities. Averaging techniques such as arithmetic and geometric can be unreliable. It is proposed that features observed in tidal heterolithics and turbidites is better assessed by simulating permeability anisotropy. This technique is not applicable to full field reservoir modelling.The proposed technique is applied to case studies from tidal and turbidite environments. In a tidal heterolithics case study the arithmetic average log derived was 49 mD and the geometric average was 5 mD. The new workflow was 91.5 mD while the welltest reference permeability was 93 mD. The turbidites case study was 14 mD for the geometric average and 680 mD for the arithmetic average however the simulation was 193 mD and the welltest permeability was 217 mD. This comparison is much improved when permeability anisotropy is considered through integrating petrophysical and sedimentological observations. A sensitivity study also reveals a hierarchy of controls on permeability anisotropy which suggest the percentage of mud is the dominant factor.Some key limitations and suggested recommendations for improvement are:1. Lateral changes in reservoir quality cannot be accounted for. Utilize observations at the seismic scale.2. Complexity of the near wellbore model and limits data availability. A database of analogs should be utilised in the absence of hard data.3. Two phase flow has not been considered as part of this workflow due to availability. It is recommended that this be part of further research in this area.4. Fractures and diagenetic changes cannot be simulated with this workflowThis work contributes a protocol for assessing and using permeability anisotropy to improve prediction of well productivity which should reduce the risk in the decision making.
Nelson-Barr ultralight dark matter
Creators: name: Dine, Michael
name: Perez, Gilad
name: Ratzinger, Wolfram
name: Savoray, Inbar
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that, in the Nelson-Barr solution to the strong CP-problem, a naturally light scalar can arise. It gives rise to a completely new phenomenology beyond that of the celebrated QCD axion, if this field constitutes dark matter, as the CKM elements vary periodically in time. We also discuss how the model can be tested using quantum sensors, in particular using nuclear clocks, which leads to an interesting synergy between different frontiers of physics.
description: 8 pages
An experimental investigation of the nonlinear vibration of cylindrical shells
Creators: name: Kendall, Frank
Publisher: name: California Institute of Technology
Year: 1973
Subjects: Aeronautics

description: An experimental investigation of the nonlinear vibrations of
cylindrical shells was undertaken. An aluminum shell was vibrated by means of an induction shaker. An optical device was used to obtain radial displacement measurements. Several modes of vibration were studied in detail. Various nonlinear effects were observed. These included nonlinearity in the driven mode frequency response
curve, the participation of the companion mode, and the participation of axisymmetric response at twice the driven frequency. The experimental results indicated only a softening type nonlinearity. The response of the companion mode was significant in several of the modes studied and was of a more complex nature than was predicted by previous theoretical work.
Crystallography under external electric field
Creators: name: Gorfman, Semen
name: Schmidt, Oleg
name: Tsirelson, Vladimir
name: Ziolkowski, Michael
name: Pietsch, Ullrich
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Structural response of crystals to an applied external perturbation is important as a key for understanding microscopic origin of physical properties. Experimental investigation of structural response is a great challenge for modern structure analysis. We demonstrate how advanced X-ray diffraction techniques facilitate probing tiny (10-4 Å) distortions of bond lengths under a permanent electric field. We also discuss details of the experimental procedure essential for reaching such precision. We ask whether the experiment can be used to evaluate chemical bonds in crystals by their sensitivity to an external electric field and discuss if the bond deformations can be predicted using the bond-valence model or the Bader's theory of atoms in molecules and crystals. Finally, we describe the new time-resolved studies of a structural response to a dynamical switch of applied electric field. These results give access to the time-lining of piezoelectric effect on a microsecond time scale.
description: 10 pages, 10 figures
Modification of electromagnetic structure functions for the $γZ$-box diagram
Creators: name: Rislow, Benjamin C.
name: Carlson, Carl E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The $γZ$-box diagram for parity violating elastic $e$-$p$ scattering has recently undergone a thorough analysis by several research groups. Though all now agree on the analytic form of the diagram, the numerical results differ due to the treatment of the structure functions, $F_{1,2,3}^{γZ}(x,Q^2)$. Currently, $F_{1,2,3}^{γZ}(x,Q^2)$ at low $Q^2$ and $W^2$ must be approximated through the modification of existing fits to electromagnetic structure function data. We motivate and describe the modification used to obtain $F_{1,2}^{γZ}(x,Q^2)$ in our previous work. We also describe an alternative modification and compare the result to our original calculation. Finally, we present a new modification procedure to acquire $F_3^{γZ}(x,Q^2)$ in the resonance region and calculate the axial contribution to the $γZ$-box diagram. Details of these modifications will illuminate where discrepancies between the groups arise and where future improvements can be made.
description: 8 pages, 3 figures. Version 2 contains a more thorough analysis of the corrective prefactors
title: Application of thyristor parameter stabilizer for power take-off from half-wave power transmission
Creators: name: Khoiutanov, A.M.
name: Vasilyev, P.F.
name: Davydov, G.I.
Publisher: name: Scientific Research Centre "MachineStructure"
Year: 2019

description: In this paper, we study the operation modes of a half-wave power transmission line with the connection of intermediate systems for selection of mutual power transfer. Using the model of a half-wave power transmission line, studies were carried out on the selection of power. As a result, methods and methods for selecting power from a half-wave transmission line have been developed. The feature of half-wave power transmission is the change in voltage in the middle part of the line from the maximum, in the load mode, to zero, in idle. This does not allow the parallel selection of power in this part of the line in idle mode. It is established that the use of a thyristor parameter stabilizer allows selection at any intermediate point of a half-wave transmission line and compensation of only the wave length of the line is a more effective method of regulating the voltage at the sampling site.
The Emotional Universe of Insecure Scholars in the Early Modern Ottoman Hierarchy of Learning
Creators: name: Şen, A. Tunç
Publisher: name: Columbia University
Year: 2021
Subjects: Islamic learning and scholarship
Muslim scholars
History

description: In this paper, I will focus on a particular Ottoman madrasa instructor from the so-called magnificent years of Süleyman's reign (r. 1520–66) whose self-narratives or “ego-documents,” scattered across a multitude of sources, illustrate the emotional states of a mid- to low-ranking member of the rigidly hierarchical Ottoman scholarly establishment. His is a richly documented case of an “exceptionally normal,” full of vivid details that allow us to decenter the available literature on early modern Islamicate and Ottoman intellectual history and its marked preference for the success stories of celebrated names over the failures of more marginal figures. In examining the writings of Ottoman scholars of lesser rank and social standing that are dispersed among their understudied private letter collections (münşeʾāt mecmūʿaları), autobiographical accounts, literary compositions, scholarly treatises, and even the paratextual records that one may locate in the manuscripts these scholars copied or possessed, one can reconstruct emotional pendulums that swung across various feelings in the face of ever-changing and challenging structural and circumstantial limitations. These limitations include more than just the financial insecurities and intellectual rivalries that were inherent both in the scholarly bureaucratic hierarchy and the overarching patronage system of the early modern Ottoman world of scholarship. One also should take into account how recurrent diseases, unexpected disasters, and physical distance to familiar people and places between rotational appointments left their indelible marks on the emotional canvas of Ottoman scholars.
title: Analysis of losses in copper and steel in low power transformers
Creators: name: Plotnikov, S.M.
name: Kolmakov, O.V.
Publisher: name: Scientific Research Centre "MachineStructure"
Year: 2019

description: It is shown that the losses determined by the wattmetric method in the steel of low-power transformers contain a component of electrical losses. Expressions are obtained for adjusting losses.
Researching Women's Film History
Creators: name: Bell, Melanie
name: Cobb, Shelley
name: Gledhill, Christine
name: Mukherjee, Debashree
name: Porter, Laraine
name: Sawhney, Rashmi
name: Sieglohr, Ulrike
Publisher: name: Columbia University
Year: 2020
Subjects: Women in the motion picture industry
Feminism and motion pictures
Motion pictures
Motion pictures--Production and direction

description: While 1970s/1980s feminist film theory questioned the representability of women within a male-dominated industry, renewed interest in early film history revealed unexpected numbers of women film makers. The international Women Film Pioneers Project (WFPP), an ever-growing database housed at Columbia University, New York, documents research into the pioneering work of women in cinema's first crucial decades as it became a mass and transnational medium. A surge of monographs has followed, focusing on women's diverse careers, the gendering of film studio organization and practices, and the cultural impacts of female audiences, campaigners, journalists, and critics. These discoveries are emerging in festival and film theater programming, film education, and local cultural activity. In Britain, the Women's Film & Television History Network-UK/Ireland, encourages research across the barriers between silence and sound, cinema and television. In what follows, the Network records key issues and figures emerging from the project of women's film history, across the world.
Zero Temperature Phase Diagram of the Classical Kane-Mele-Heisenberg Model
Creators: name: Zare, Mohammad Hossein
name: Fazileh, Farhad
name: Shahbazi, Farhad
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The classical phase diagram of the Kane-Mele-Heisenberg model is obtained by three complementary methods: Luttinger-Tisza, variational minimization, and the iterative minimization method. Six distinct phases were obtained in the space of the couplings. Three phases are commensurate with long-range ordering, planar N{é}el states in horizontal plane (phase.I), planar states in the plane vertical to the horizontal plane (phase.VI) and collinear states normal to the horizontal plane (phase.II). However the other three, are infinitely degenerate due to the frustrating competition between the couplings, and characterized by a manifold of incommensurate wave-vectors. These phases are, planar helical states in horizontal plane (phase.III), planar helical states in a vertical plane (phase.IV) and non-coplanar states (phase.V). Employing the linear spin-wave analysis, it is found that the quantum fluctuations select a set of symmetrically equivalent states in phase.III, through the quantum order-by-disorder mechanism. Based on some heuristic arguments is argued that the same scenario may also occur in the other two frustrated phases VI and V.
description: 13 pages
Toward Reproducible Enzyme Modeling with Isothermal Titration Calorimetry
Creators: name: Ott, Felix
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2022

description: To apply enzymes in technical processes, a detailed understanding of the molecular mechanisms is required. Kinetic and thermodynamic parameters of enzyme catalysis are crucial to plan, model, and implement biocatalytic processes more efficiently. While the kinetic parameters, Km and kcat, are often accessible by optical methods, the determination of thermodynamic parameters requires more sophisticated methods. Isothermal titration calorimetry (ITC) allows the label-free and highly sensitive analysis of kinetic and thermodynamic parameters of individual steps in the catalytic cycle of an enzyme reaction. However, since ITC is susceptible to interferences due to denaturation or agglomeration of the enzymes, the homogeneity of the enzyme sample must always be considered, and this can be accomplished by means of dynamic light scattering (DLS) analysis. The presented ITCdependent workflow was used to determine both the kinetic and the thermodynamic data for a cofactor-dependent enzyme. Using a standardized approach with the implementation of sample quality control by DLS, we obtained high-quality data suitable for the advanced modeling of the enzyme reaction mechanism. Specifically, we investigated stereoselective reactions catalyzed by the NADPH-dependent ketoreductase Gre2p under different reaction conditions. The results revealed that this enzyme operates with an ordered sequential mechanism in which the cofactor NADPH binds first, resulting in Gre2pholo, and that only Gre2pholo can then bind the substrate NDK. In addition, the enzyme was found to be affected by substrate or product inhibition depending on the reaction buffer. Data reproducibility, a mandatory prerequisite to achieve robust modeling, is ensured by specifying standard operating procedures, using programmed workflows for data analysis and storing all data in a F.A.I.R. (findable, accessible, interoperable, and reusable) repository. Our approach highlights the utility for combined binding and kinetic studies for such complex multisubstrate reactions. Because it is amenable to automation and scale-up for high-throughput, the combination of such diverse approaches will provide the high-quality data needed for the engineering of enzymes and biocatalytic processes through machine learning to accelerate future development of industrial biocatalysis.
Spin wave mode coexistence on the nano-scale: A consequence of the Oersted field induced asymmetric energy landscape
Creators: name: Dumas, Randy K.
name: Iacocca, Ezio
name: Bonetti, Stefano
name: Sani, Sohrab
name: Mohseni, Majid
name: Eklund, Anders
name: Persson, Johan
name: Heinonen, Olle
name: Åkerman, Johan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: It has been argued that if multiple spin wave modes are competing for the same centrally located energy source, as in a nanocontact spin torque oscillator, that only one mode should survive in the steady state. Here, the experimental conditions necessary for mode coexistence are explored. Mode coexistence is facilitated by the local field asymmetries induced by the spatially inhomogeneous Oersted field, which leads to a physical separation of the modes, and is further promoted by spin wave localization at reduced applied field angles. Finally, both simulation and experiment reveal a low frequency signal consistent with the intermodulation of two coexistent modes.
description: 20 pages (including supplementary material), 6 figures
Resummation of non-global logarithms at finite $N_c$
Creators: name: Hatta, Yoshitaka
name: Ueda, Takahiro
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the context of inter-jet energy flow, we present the first quantitative result of the resummation of non-global logarithms at finite N_c. This is achieved by refining Weigert's approach in which the problem is reduced to the simulation of associated Langevin dynamics in the space of Wilson lines. We find that, in e+e- annihilation, the exact result is rather close to the result previously obtained in the large-N_c mean field approximation. However, we observe enormous event-by-event fluctuations in the Langevin process which may have significant consequences in hadron collisions.
description: 16 pages, 3 figures; v2 one reference added, accepted for publication in Nucl.Phys.B
W and Z bosons in association with two jets using the POWHEG method
Creators: name: Campbell, John M.
name: Ellis, R. Keith
name: Nason, Paolo
name: Zanderighi, Giulia
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In this work we present the implementation of generators for W and Z bosons in association with two jets interfaced to parton showers using the POWHEG BOX. We incorporate matrix elements from the parton-level Monte Carlo program MCFM in the POWHEG BOX, allowing for a considerable improvement in speed compared to previous implementations. We address certain problems that arise when processes that are singular at the Born level are implemented in a shower framework using either a generation cut or a Born suppression factor to yield weighted events. In such a case, events with very large weights can be generated after the shower through a number of mechanisms. Events with very small transverse momentum at the Born level can develop large transverse momentum either after the hardest emission, after the shower, or after the inclusion of multi-parton interactions. We present a solution to this problem that can be easily implemented in the POWHEG BOX. We also show that a full solution to this problem can only be achieved if the generator maintains physical validity also when the transverse momentum of the emitted partons becomes unresolved. One such scheme is the recently-proposed MiNLO method for the choice of scale and the exponentiation of Sudakov form factors in NLO computations. We present a validation study of our generators, by comparing their output to available LHC data.
description: 35 pages, 43 figures