cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Supplemental data for: Longitudinal, multi-platform metagenomics yields a high-quality genomic catalog and guides an in vitro model for cheese communities
Creators: name: Saak, Christina C.
name: Pierce, Emily C.
name: Dinh, Cong B.
name: Portik, Daniel
name: Hall, Richard
name: Ashby, Meredith
name: Dutton, Rachel J.
Publisher: name: Zenodo
Year: 2023
Subjects: metagenome assemblies
bacterial isolate assemblies
washed-rind cheese
multi-platform metagenomics
PacBio HiFi sequencing
Illumina short-read sequencing
Nanopore long-read sequencing
Metagenome-assembled genomes (MAG's)

description: Microbiomes are intricately intertwined with human health, geochemical cycles, and food production. While many microbiomes of interest are highly complex and experimentally intractable, cheese rind microbiomes have proven powerful model systems for the study of microbial interactions. To provide a more comprehensive view of the genomic potential and temporal dynamics of cheese rind communities, we combine longitudinal, multi-platform metagenomics of three ripening washed-rind cheeses with whole genome sequencing of community isolates. Sequencing-based approaches revealed a highly reproducible microbial succession in each cheese, co-existence of closely related Psychrobacter species, and enabled the prediction of plasmid and phage diversity and their host associations. Combined with culture-based approaches, we established a genomic catalog and a paired 16-member in vitro washed rind cheese system. The combination of multi-platform metagenomic time-series data and an in vitro model provides a rich resource for further investigation of cheese rind microbiomes both computationally and experimentally.
description: Funding provided by: National Institutes of Health
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100000002
Award Number: DP2 AT010401Funding provided by: David and Lucile Packard Foundation
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100000008
Award Number: 2016-65131Funding provided by: Pew Charitable Trusts
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100000875
Award Number: Pew Scholar in Biomedical SciencesFunding provided by: Graduate Women in Science
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100014816
Award Number: Nell Mondy FellowshipFunding provided by: Graduate Women in Science
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100014816
Award Number: Elizabeth Weisburger Fellowship
description: A detailed methods description can be found in the corresponding manuscript "Longitudinal, multi-platform metagenomics yields a high-quality genomic catalog and guides an in vitro model for cheese communities".
Time-scale analysis non-local diffusion systems, applied to disease models
Creators: name: Pereira, Marcone C.
name: Oliva, Sergio
name: Sartori, Larissa M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: The objective of the present paper is to use the well known Ross-Macdonald models as a prototype, incorporating spatial movements, identifying different times scales and proving a singular perturbation result using a system of local and non-local diffusion. This results can be applied to the prototype model, where the vector has a fast dynamics, local in space, and the host has a slow dynamics, non-local in space.
Engineering Holographic Superconductor Phase Diagrams
Creators: name: Chen, Jiunn-Wei
name: Dai, Shou-Huang
name: Maity, Debaprasad
name: Zhang, Yun-Long
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study how to engineer holographic models with features of a high temperature superconductor phase diagram. We introduce a field in the bulk which provides a tunable "doping" parameter in the boundary theory. By designing how this field changes the effective masses of other order parameter fields, desired phase diagrams can be engineered. We give examples of generating phase diagrams with phase boundaries similar to a superconducting dome and an anti-ferromagnetic phase by including two order parameter fields. We also explore whether the pseudo gap phase can be described without adding another order parameter field and discuss the potential scaling symmetry associated with a quantum critical point hidden under the superconducting dome in this phase diagram.
description: 25 pages, 7 figures
Laguerre-Gaussian transform for rotating image processing
Creators: name: Wei, Dan
name: Ma, Jiantao
name: Wang, Tianxin
name: Xu, Chuan
name: Cai, Yin
name: Zhang, Lidan
name: Fang, Xinyuan
name: Wei, Dunzhao
name: Zhu, Shining
name: Zhang, Yong
name: Xiao, Min
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Image and Video Processing (eess.IV)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Rotation is a common motional form in nature, existing from atoms and molecules, industrial turbines to astronomical objects. However, it still lacks an efficient and reliable method for real-time image processing of a fast-rotating object. Since the Fourier spectrum of a rotating object changes rapidly, the traditional Fourier transform (FT) techniques become extremely complicated and time consuming. Here, we propose a Laguerre-Gaussian (LG) transform to analyze the rotating object with LG-mode basis. The rotation operation provides a feasible way to acquire LG spectrum, which is similar to the function of lens in FT. Particularly, the obtained LG spectrum does not change even the object working at a high rotating speed. By analyzing the LG spectrum, one can perform image processing such as reconstruction, edge enhancement, and pattern replication. Such LG transform provides an efficient and convenient way to real-time monitor and analyze a fast-rotating object in scientific research and industry.
Universality of random matrix dynamics
Creators: name: Burda, Zdzislaw
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We discuss the concept of width-to-spacing ratio which plays the central role in the description of local spectral statistics of evolution operators in multiplicative and additive stochastic processes for random matrices. We show that the local spectral properties are highly universal and depend on a single parameter being the width-to-spacing ratio. We discuss duality between the kernel for Dysonian Brownian motion and the kernel for the Lyapunov matrix for the product of Ginibre matrices.
description: 15 pages, 3 figures
Assessment Centralized Construction Materials Supply & Management Effect on the delay of Housing Project: A case study of Project -12 (20/80) Condominiums At koye feche Akaki Kality
Creators: name: Afework Asfaw
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2021
Subjects: Centralization, Construction materials, Supply, Delays of project, CSM, Condominium Project (Project-12)

description: The housing problems of Addis Ababa are very critical. The city government is taking
 serious measures to minimize these enormous gaps of the resident demand using
 construction of huge condominium projects. However, delivering those houses on time is
 becoming unachievable due to different delay factors. This study aimed to assess centralized
 supply and management effect on the delay of 20/80 condominium projects particularly
 focusing on the case of project 12-branch at Koye Feche Akaki Kality construction site in
 Addis Ababa. The research design of this study was descriptive and applied quantitative
 research approach method. The stratified sampling procedures were used and samples were
 taken from various stake holders of the head office and Project-12. The study sought that
 CSM implemented on the projects but on the analysis observed lot of challenges such as
 applying improper methodology of supply and management, excessive bureaucracy, no
 clear transparency and accountability procedures, lack of skilled competent and committed
 manpower, weak controlling and poor communication between all stakeholders and the like
 were great influence on the delay of the projects. Most of the respondents were related in
 their profession, education and their work experiences to facilitate the CSM thus the system
 didn’t support them. For the study the period of the time, centralized supply and
 management was not efficiently working in the organization. So the study recommends that
 he centralized management should be improved for better performance through the
 decentralization, hybrid management or other best alternatives, underprivileged managing
 and controlling the whole CSM system in the organization must be improved..
Length-scales of Dynamic Heterogeneity in a Driven Binary Colloid
Creators: name: Dutta, S.
name: Chakrabarti, J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Here we study characteristic length scales in an aqueous suspension of symmetric oppositely charged colloid subject to a uniform electric field by Brownian Dynamics simulations. We consider a sufficiently strong electric field where the like charges in the system form macroscopic lanes. We construct spatial correlation functions characterizing structural order and that of particles of different mobilities in-plane transverse to the electric field at a given time. We call these functions as equal time density correlation function (ETDCF). The ETDCF between particles of different charges, irrespective of mobilities, are called structural ETDCFs, while those between particles of different mobilities are called the dynamic ETDCF. We extract the characteristic length of correlation by fitting the envelopes of the ETDCFs to exponential dependence. We find that structural ETDCF and the dynamical-ETDCFs of the slow particles increase with time. This suggests that the slow particles undergo microphase separation in the background of the fast particles which drive the structural pattern in the plane transverse to the lanes. The ETDCFs can be measured for colloidal systems directly following particle motion by video-microscopy and may be useful to understand patterns out of equilibrium.
A Novel Received Signal Strength Assisted Perspective-three-Point Algorithm for Indoor Visible Light Positioning
Creators: name: Bai, Lin
name: Yang, Yang
name: Feng, Chunyan
name: Guo, Caili
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, a received signal strength assisted Perspective-three-Point positioning algorithm (R-P3P) is proposed for visible light positioning (VLP) systems. The basic idea of R-P3P is to joint visual and strength information to estimate the receiver position using 3 LEDs regardless of the LEDs' orientations. R-P3P first utilizes visual information captured by the camera to estimate the incidence angles of visible lights. Then, R-P3P calculates the candidate distances between the LEDs and the receiver based on the law of cosines and the Wu-Ritt's zero decomposition method. Based on the incidence angles, the candidate distances and the physical characteristics of the LEDs, R-P3P can select the exact distances from all the candidate distances. Finally, the linear least square (LLS) method is employed to estimate the position of the receiver. Due to the combination of visual and strength information of visible light signals, R-P3P can achieve high accuracy using 3 LEDs regardless of the LEDs' orientations. Simulation results show that R-P3P can achieve positioning accuracy within 10 cm over 70% indoor area with low complexity regardless of LEDs orientations.
description: arXiv admin note: substantial text overlap with arXiv:2004.06294
Accuracy of binary black hole waveform models for aligned-spin binaries
Creators: name: Kumar, Prayush
name: Chu, Tony
name: Fong, Heather
name: Pfeiffer, Harald P.
name: Boyle, Michael
name: Hemberger, Daniel A.
name: Kidder, Lawrence E.
name: Scheel, Mark A.
name: Szilagyi, Bela
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences
subject: J.2
subject: 83C35

description: Coalescing binary black holes are among the primary science targets for second generation ground-based gravitational wave (GW) detectors. Reliable GW models are central to detection of such systems and subsequent parameter estimation. This paper performs a comprehensive analysis of the accuracy of recent waveform models for binary black holes with aligned spins, utilizing a new set of $84$ high-accuracy numerical relativity simulations. Our analysis covers comparable mass binaries ($1\le m_1/m_2\le 3$), and samples independently both black hole spins up to dimensionless spin-magnitude of $0.9$ for equal-mass binaries and $0.85$ for unequal mass binaries. Furthermore, we focus on the high-mass regime (total mass $\gtrsim 50M_\odot$). The two most recent waveform models considered (PhenomD and SEOBNRv2) both perform very well for signal detection, losing less than 0.5\% of the recoverable signal-to-noise ratio $ρ$, except that SEOBNRv2's efficiency drops mildly for both black hole spins aligned with large magnitude. For parameter estimation, modeling inaccuracies of SEOBNRv2 are found to be smaller than systematic uncertainties for moderately strong GW events up to roughly $ρ\lesssim 15$. PhenomD's modeling errors are found to be smaller than SEOBNRv2's, and are generally irrelevant for $ρ\lesssim 20$. Both models' accuracy deteriorates with increased mass-ratio, and when at least one black hole spin is large and aligned. The SEOBNRv2 model shows a pronounced disagreement with the numerical relativity simulation in the merger phase, for unequal masses and simultaneously both black hole spins very large and aligned. Two older waveform models (PhenomC and SEOBNRv1) are found to be distinctly less accurate than the more recent PhenomD and SEOBNRv2 models. Finally, we quantify the bias expected from all GW models during parameter estimation for recovery of binary's masses and spins.
description: 24 pages, 15 figures, minor changes
[B.7.01.a.] Le programme commun : une possibilité concrète de remporter une grande victoire, sachons la saisir
Creators: name: Diard, Jean
name: Bidou, Jacques (1945-....)
Publisher: name: École des Hautes Études en Sciences Sociales; Uni/Ci/Té
Year: 2023
Subjects: http://www.idref.fr/034705074/id
http://www.idref.fr/027299031/id
http://www.idref.fr/027261468/id

Abstract
Analytical Channel Model and Link Design Optimization for Ground-to-HAP Free-Space Optical Communication Networks
Creators: name: Safi, Hossein
name: Dargahi, Akbar
name: Cheng, Julian
name: Safari, Majid
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Integrating high altitude platforms (HAPs) and free-space optical (FSO) communications is a promising solution to establish high data rate aerial links for the next-generation wireless networks. However, practical limitations such as pointing errors and angle-of-arrival (AOA) fluctuations of the optical beam due to the orientation deviations of hovering HAPs make it challenging to implement HAP-based FSO links. For a ground-to-HAP FSO link, tractable, closed-form statistical channel models are derived in this paper to simplify the optimal design of such systems. The proposed models include the combined effects of atmospheric turbulence regimes (i.e., log-normal and gamma-gamma), pointing error induced geometrical loss, pointing jitter variance caused by beam wander, detector aperture size, beam-width, and AOA fluctuations of the received optical beam. The analytical expressions are corroborated by performing Monte-Carlo simulations. Furthermore, closed-form expressions for the outage probability of the considered link under different turbulence regimes are derived. Detailed analysis is carried out to optimize the transmitted laser beam and the field-of-view of the receiver for minimizing outage probability under different channel conditions. The obtained analytical results can be applied to finding the optimal parameter values and designing ground-to-HAP FSO links without resorting to time-consuming simulations.
description: 11 pages, 13 figures, accepted on May 22, 2020, for publication in IEEE/OSA Journal of Lightwave Technology
Rogue Wave Spectra of the Kundu-Eckhaus Equation
Creators: name: Bayindir, Cihan A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In this paper we analyze the rogue wave spectra of the Kundu-Eckhaus equation (KEE). We compare our findings with their nonlinear Schrodinger equation (NLSE) analogs and show that the spectra of the individual rogue waves significantly differ from their NLSE analogs. A remarkable difference is the one-sided development of the triangular spectrum before the rogue wave becomes evident in time. Also we show that increasing the skewness of the rogue wave results in increased asymmetry in the triangular Fourier spectra. Additionally, the triangular spectra of the rogue waves of the KEE begin to develop at earlier stages of the their development compared to their NLSE analogs, especially for larger skew angles. This feature may be used to enhance the early warning times of the rogue waves. However we show that in a chaotic wavefield with many spectral components the triangular spectra remains as the main attribute as a universal feature of the typical wavefields produced through modulation instability and characteristic features of the KEE's analytical rogue wave spectra may be suppressed in a realistic chaotic wavefield.
A pulsation analysis of K2 observations of the subdwarf B star PG1142-037 during Campaign 1: A subsynchronously rotating ellipsoidal variable
Creators: name: Reed, M. D.
name: Baran, A. S.
name: Ostensen, R. H.
name: Telting, J. H.
name: Kern, J. W.
name: Bloemen, S.
name: Blay, P.
name: Pursimo, T.
name: Kuutma, T.
name: Slumstrup, D.
name: Saajasto, M.
name: Nielsen, L. D.
name: Harmanen, J.
name: Winans, A. J.
name: Foster, H. M.
name: Rowe, L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report a new subdwarf B (sdB) pulsator, PG1142-037, discovered during the first full-length campaign of K2, the two-gyro mission of the Kepler space telescope. Fourteen periodicities have been detected between 0.9 and 2.5 hours with amplitudes below 0.35 ppt. We have been able to associate all of the pulsations with low-degree, ell<=2 modes. Follow-up spectroscopy of PG1142 has revealed it to be in a binary with a period of 0.54 days. Phase-folding the K2 photometry reveals a two-component variation including both Doppler boosting and ellipsoidal deformation. Perhaps the most surprising and interesting result is the detection of an ellipsoidal, tidally distorted variable with no indication of rotationally-induced pulsation multiplets. This indicates that the rotation period is longer than 45 days, even though the binary period is near 13 hours.
description: 11 pages, 9 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society
Aqueous Extraction and Process Optimization of Natural Pigments from Red Beet Stalk
Creators: name: Melaku Endaweke
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2021
Subjects: Beetroot stalk; colorants; Aqueous extraction; Box-Behnken design; Response surface methodology; Optimization

description: Synthetic colorants are harmful to the human body, and lead to an increase the
 exposure to toxic and carcinogenic compounds. Beetroot stalks are generally
 considered as a waste. They contain a significant amount of betalains which can be
 utilized in medicinal and food applications. This study aimed to investigate and
 optimize process variables such as extraction time, temperature, and solid to liquid
 ratio of beetroot stalk on the aqueous extraction of natural pigment from beetroot
 stalk. In this study optimum conditions to maximize the aqueous extractions of
 betacyanin, betaxanthin, and betalamic acid from beetroot stalk were performed
 using a three-factor and three-level Box-Behnken design under response surface
 methodology (RSM). The parameters range were selected as follows, time: 10-30
 min, temperature: 40-70 oC, and solid to liquid ratio of beet rootstalk: 10-30 mg/ml
 using water as a solvent. The experiments were conducted and analyzed according
 to Design Expert-7.0.0 software. At the optimum condition, Time 21.14-min,
 Temperature 52.98 oC and solid liquid ratio 21.61mg/ml the total betacyanin,
 betaxanthin, and betalamic acid content were predicted to be 15.53 mg/100g, 9.5
 mg/100g, and 5.5mg/100g respectively. The acquired pigments were characterized
 by Fourier Transform Infrared Spectroscopy (FTIR) to confirm the presence of the
 betalian. X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) analysis
 also has been carried out, and showed that the product has lack of crystallinity with
 some amorphous property
Thermo-Optic Properties of Silicon-Rich Silicon Nitride for On-chip Applications
Creators: name: Nejadriahi, Hani
name: Friedman, Alex
name: Sharma, Rajat
name: Pappert, Steve
name: Fainman, Yeshaiahu
name: Yu, Paul
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We demonstrate the thermo-optic properties of silicon-rich silicon nitride (SRN) films deposited using plasma-enhanced chemical vapor deposition (PECVD). Shifts in the spectral response of Mach-Zehnder Interferometers (MZIs) as a function of temperature were used to characterize the thermo-optic coefficients of silicon nitride films with varying silicon contents. A clear relation is demonstrated between the silicon content and the exhibited thermo-optic coefficient in silicon nitride films, with the highest achievable coefficient being as high as (1.65+/-0.08) x 10-4 K-1. Furthermore, we realize an SRN Multi-Mode Interferometer (MMI) based thermo-optic switch with over 20 dB extinction ratio and total power consumption for two-port switching of 50 mW.
description: 10 pages, 7 figures, submitted to a journal
Accurate Closed-Form Real-Time EGN Model Formula Leveraging Machine-Learning over 8500 Thoroughly Randomized Full C-Band Systems
Creators: name: Zefreh, Mahdi Ranjbar
name: Forghieri, Fabrizio
name: Piciaccia, Stefano
name: Poggiolini, Pierluigi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We derived an approximate non-linear interference (NLI) closed-form model (CFM), capable of handling a very broad range of optical WDM system scenarios. We tested the CFM over 8500 randomized C-band WDM systems, of which 6250 were fully-loaded and 2250 were partially loaded. The systems had highly diversified channel formats, symbol rates, fibers, as well as other parameters. We improved the CFM accuracy by augmenting the formula with simple machine-learning factors, optimized by leveraging the system test-set. We further improvedthe CFM by adding a term which models special situations where NLI has high self-coherence. In the end, we obtained a very good match with the results found using the numerically-integrated Enhanced GN-model (or EGN-model). We also checked the CFM accuracy by comparing its predictions with full-C-Band split-step simulations of 300 randomized systems. The combined high accuracy and very fast computation time (milliseconds) of the CFM potentially make it an effective tool for real-time physical-layer-aware optical network management and control.
description: Author's version of the manuscript accepted for publication on the Journal of Lightwave Technology, May 2020
Analysis Road traffic congestion and its economic impact in Addis Ababa City A case study in Yeka Sub City ( A Major intersection Along Megenagna to Karalo )
Creators: name: Serkalem Siyamregn
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2021
Subjects: Economic impact, traffic congestion, Delay, level of service, economical cost.

description: Most developing countries are facing many challenges like traffic accidents, traffic
 congestion, and air pollution. Now a day’s traffic congestion is increasing from time
 to time and becomes a determinant issue in the transportation sector, especially in
 Addis Ababa city. Most social and economic activities in Addis Ababa are
 concentrated in the central part of the city. This research focused Analysis road
 traffic congestion and its economic impacts in Addis Ababa city, especially at major
 intersections along Megenaga to karalo road. The main problems in the study area
 are poor traffic management system, un planned population settlement, dis organized
 trading activities, diverted traffic, under capacity of the road,and illegal street
 parking. on the street, are the main problem in the study area. As aresult, commuters
 incur negative impacts like excessive delay, loss of a working hour, and longer
 commuting on the road. The required data in this study were primary and secondary.
 Primary data contains qualitative and quantitative data. Quantitative data contains
 traffic count, travel time record using a video camera, measure lane and median
 width. Quantitative data analysis was performed using an Excel spreadsheet and
 Sidra intersection Plus 8 Software. Qualitative data were acquired using a
 questionnaire. In this research, Descriptive and statistical analysis methods were
 used. To analyze road traffic congestion First Analysis identifies the cause and
 analysis the level of service using SIDRA intersection plus 8. Next to this, traffic cost
 was calculated considering delay, including total vehicle operating and time cost, fuel
 consumption due to congestion, and total carbon dioxide emission due to congestion,
 affecting the environment. Then finally, mitigation measures for traffic congestion are
 recommended based on field visit study and questionnaire response. Based on the
 analysis, total congestion cost about $ 8,136,984 per year. While improving public
 transport system, and fully completed kotebe (Asmera road) cost of congestion about
 $ 4,496,339.2 per year is saved and 1,174,771 kg of CO2 emission could be reduced
 per year in the study area
A sequence of transcritical bifurcations in a suspension of gyrotactic microswimmers in vertical pipe
Creators: name: Fung, Lloyd
name: Hwang, Yongyun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Kessler (Nature, vol. 313, 1985, pp. 218-220) first showed that plume-like structures spontaneously appear from both stationary and flowing suspensions of gyrotactic microswimmers in a vertical pipe. Recently, it has been shown that there exist multiple numbers of steady axisymmetric axially uniform solutions to such a system (Bees, M. A. & Croze, O. A., Proc. R. Soc. A., vol. 466, 2010, pp. 2057-2077). In the present study, we generalise this finding by reporting that a countably infinite number of such solutions emerge as Richardson number increases. Linear stability, weakly nonlinear and fully nonlinear analyses are performed, revealing that each of the solutions arises from the destabilisation of uniform suspension. The discrete number of the solutions is due to the finite flow domain, while the transcritical nature of the bifurcation is because of the cylindrical geometry which breaks the horizontal symmetry of the system. It is further shown that there exists a maximum threshold of achievable downward flow rate for each solution if the flow is to remain steady, as varying the pressure gradient can no longer increase the flow rate from the solution. Except the one arising at the lowest Richardson number, all of the solutions found are unstable, implying that they would play a role in the transient dynamics in the route from a uniform suspension to the fully-developed gyrotactic pattern.
Analysis of Road Traffic Accident and Identifying Accident Cluster Locations Using Visum-Safety; the Case of Addis Ababa Kolfe-Keranio Sub-City Road Network
Creators: name: Muluken  Zeleke
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2021
Subjects: Visum-safety, accident analysis, road traffic accident, black spot, accident prone section.

description: According to the WHO report in 2018, Road Traffic Accident is the sixth leading cause of death
 in Ethiopia with proportion of 4.81% from total deaths of the country and it is a cause of
 thousands of injuries. As a result, it is causing serious health problem and economic loses for the
 country. From this, Addis Ababa takes the lion’s share of accident risks because from the nation
 crashes more than half occur in Addis. The aim of this research is to indicate the way to reduce
 the impact of traffic accident by implementing road safety intervention on existing road network.
 The main objective of the study was to analyze the road traffic accident using Visum-safety
 software in Addis Ababa Kolfe-Keranio sub-city road network. A five years crash data was
 collected from Addis Ababa Transport Bureau (AATB) and Kolfe-Keranio Police Department
 (KKPD), whereas road geometric data collected from Addis Ababa City Roads Authority
 (AACRA). The collected crash data analyzed by Visum-safety software using AACRA road
 network shape file and OSM as network file. Frequency distributions of accident based on
 accident category, accident type, road user, contributing factors and based on time was
 generated. Hazardous locations or black spots and accident prone sections were identified and
 prioritized based on the accident frequency and accident density respectively. In addition, the
 safety condition of top black spots and accident prone sections was inspected on site and
 proposed countermeasures for the problems. Road safety interventions are needed to reduce the
 impact of the most contributing factors such as speeding, priority not giving and turning fault, by
 providing speed calming, traffic sign and traffic marking on the horizontal curved and downhill
 grade hazardous section and intersection approach
Festuca nemoralis Turpe 1969
Creators: name: Ospina, Juan C.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Poales
Poaceae
Festuca
Festuca nemoralis

description: Festuca nemoralis Türpe (1969: 213)
 Lectotype:— ARGENTINA. Tucumán: Tafí del Valle, ‘ La Ciénaga’, 2800 m s.m., 5 February 1933, L. R. Parodi 11049 (first-step lectotype BAA, designated by Türpe (1969: 213), corrected from “typus”, second-step lectotype BAA 00000170!, designated here, isolectotypes BAA 00422!, LIL 505103!, US 1539751!).
 Taxonomic notes:—The specimen ‘Tucumán. Depto. Tafí: La Ciénaga, a 2800 m s.m. leg. L. R. Parodi 11049, 5-II-1933 (BAA)’ was indicated as ‘ Typus speciei ’ in the protologue of Festuca nemoralis by Türpe (1969: 213). The author used the word ‘Typus’ to indicate the original material from F. nemoralis. More than one sheet of original material was found at BAA, LIL, and US. Türpe’s designation is corrected to “ lectotype ”, applying Art. 9.9 (McNeill et al. 2012), and a sheet at BAA is designated as the second-step lectotype.
description: Published as part of Ospina, Juan C., 2016, New lectotypifications and new synonyms in Festuca (Poaceae, Pooideae, Loliinae) from the Central Andes, pp. 247-258 in Phytotaxa 247 (4) on page 255, DOI: 10.11646/phytotaxa.247.4.2, http://zenodo.org/record/13677533
[B.7.01.b.] Sans le soutien des femmes, le programme commun ne peut triompher. Leur choix est décisif. Leur sort est entre leurs mains.
Creators: name: Diard, Jean
name: Bidou, Jacques (1945-....)
Publisher: name: École des Hautes Études en Sciences Sociales; Uni/Ci/Té
Year: 2023
Subjects: http://www.idref.fr/027261468/id
http://www.idref.fr/027299031/id
http://www.idref.fr/027225763/id
http://www.idref.fr/034705074/id

Abstract
XMM-Newton and Suzaku Spectroscopic Studies of Unidentified X-ray Sources towards the Galactic Bulge: 1RXS J180556.1$-$343818 and 1RXS J173905.2$-$392615
Creators: name: Mori, Hideyuki
name: Maeda, Yoshitomo
name: Ueda, Yoshihiro
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: With the XMM-Newton and Suzaku observations, for the first time, we acquired broad-band spectra of two unidentified X-ray sources towards the Galactic bulge: 1RXS J180556.1$-$343818 and 1RXS J173905.2$-$392615. The 1RXS J180556.1$-$343818 spectrum in the $0.3$-$7$ keV band was explained by X-ray emission originated from an optically-thin thermal plasma with temperatures of $0.5$ and $1.7$ keV. The estimated absorption column density of $N_{\rm H} \sim 4 \times 10^{20}$ cm$^{-2}$ was significantly smaller than the Galactic HI column density towards the source. A candidate of its optical counterpart, HD 321269, was found within $4''$. In terms of the X-ray properties and the positional coincidence, it is quite conceivable that 1RXS J180556.1$-$343818 is an active G giant. We also found a dim X-ray source that was positionally consistent with 1RXS J173905.2$-$392615. Assuming that the X-ray spectrum can be reproduced with an absorbed optically-thin thermal plasma model with $kT = 1.6$ keV, the X-ray flux in the $0.5$-$8$ keV band was $8.7 \times 10^{-14}$ erg s$^{-1}$ cm$^{-2}$, fainter by a factor of $\sim 7$ than that of 1RXS J173905.2$-$392615 during the ROSAT observation. The follow-up observations we conducted revealed that these two sources would belong to the Galactic disk, rather than the Galactic bulge.
description: 9 pages, 5 figures, accepted for publication in PASJ
Analysis of Landslide triggered by heaavy rainfall : A case study in Kindo Didaye
Creators: name: Haleluya Tesfaye
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2021
Subjects: Landslide, Wolaita Sodo, Kindo Didaye, Debris Flow, Mitigation, Rain fall, Heavy rainfall

description: Landslide and its impacts are a common natural hazard that affects the day to day activity of
 human being. Especially in developing countries like Ethiopia the effect is high. The increasing
 number of population in highlands of Ethiopia and the weather change together makes the
 country vulnerable to the landslide to occur. Nowadays Heavy Rainfall is one of the results of
 weather change that is commonly occurring in Ethiopia. Not only this but also landslide as a
 result of this heavy rainfall is common incident in Ethiopia. The mountainous parts of Ethiopia
 are highly affected by such kinds of incident. In the study area, Kindo Didaye which is
 mountainous, landslide after heavy rainfall is repeatedly occurring. This incident is affecting the
 life of the people living in the area. It destroys their farm land, kills their cattle, and displaces the
 people. This research will analyze the landslide which is triggered by heavy rainfall in Kindo
 Didaye. For the study primary and secondary data were used. The primary data was collected
 from highly affected areas of the Woreda. The secondary data were taken from Wolaita Sodo
 University, hydraulics department staff who worked in the area. Using the primary data collected
 from the area different laboratory tests such as moisture content, sieve analysis, direct shear test,
 hydrometer analysis, Atterberg limit, and specific gravity tests were conducted. The moisture
 content of the soil showed that there was high amount of water in the soil. From the sieve
 analysis and specific gravity test the researcher found out that more that 50% of the soil is sandy
 soil. The hydrometer analysis showed there is silt content in the soil. The Atterberg limit test
 shows that more than 80% of the soil is well graded silty sand. And the direct shear test of the
 sample shows that more than 80% of the sample is loose angular sandy soil. The overall test
 result of the laboratory test shows that the type of the soil is silty sand.For the present study slope
 stability analysis was carried out for a slope section found 20km from Bele, (capital city of
 Kindo Koyisha). As the slope is natural, slope analysis of infinite slope in sandy soil was
 calculated. The results of the slope stability analysis indicate that the slope section is unstable
 with factor of safety is 0.9.This research investigated the type of soil found in the area, how
 heavy rainfall triggers landslide and finally possible mitigation measures are proposed.
Structural Characterizations and the Influence of Metal Work Function Contact for Nanocrystalline2,9-Dimethyl-4,7-Diphenyl-1,10-Phenanthroline Based Devices
Creators: name: Mansour, Abdelfattah
Publisher: name: figshare
Year: 2023
Subjects: Electronic and magnetic properties of condensed matter; superconductivity
Structural properties of condensed matter

description: Nanocrystalline 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline, BCP thin films were successfully deposited by conventional thermal evaporation technique at high vacuum. Surface morphology and film thickness of the obtained films were achieved from the front and cross sectional imaging of scanning electron microscopy, respectively. The influence of several rectifying metals such as Al, In, Sn and Au on the current-voltage characteristics of BCP based devices was investigated at metal/semiconductor interface. Electrical parameters of the devices were extracted from the forward current-voltage characteristics and compared with each other. The relationship of barrier height and the metal work function were found to vary almost linearly due to the pinning of Fermilevel in the lowest unoccupied molecular orbital of BCP. Moreover, the prepared devices of Al, In, Sn, and Au/ BCP showed different rectifying characteristics. High value of rectification characteristics of Au/ BCP can be interpreted by means of high value of work function of Au metal as compared with the other metals at M/S interface. In addition, analyses of current-voltage characteristics confirm that the using of different metals (Al, In, Sn, and Au) have considerable influence on electrical characteristics of the prepared BCP –based devices. The transient of the photocurrent of the
Insights into ultrafast Ge-Te bond dynamics in a phase-change superlattice
Creators: name: Malvestuto, Marco
name: Caretta, Antonio
name: Casarin, Barbara
name: Cilento, Federico
name: Dell'Angela, Martina
name: Fausti, Daniele
name: Calarco, Raffaella
name: Kooi, Bart J.
name: Varesi, Enrico
name: Robertson, John
name: Parmigiani, Fulvio
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A long-standing question for avant-grade data storage technology concerns the nature of the ultrafast photoinduced phase transformations in the wide class of chalcogenide phase-change materials (PCMs). Overall, a comprehensive understanding of the microstructural evolution and the relevant kinetics mechanisms accompanying the out-of-equilibrium phases is still missing. Here, after overheating a phase-change chalcogenide superlattice by an ultrafast laser pulse, we indirectly track the lattice relaxation by time resolved X-ray absorption spectroscopy (tr-XAS) with a sub-ns time resolution. The novel approach to the tr-XAS experimental results reported in this work provides an atomistic insight of the mechanism that takes place during the cooling process, meanwhile a first-principles model mimicking the microscopic distortions accounts for a straightforward representation of the observed dynamics. Finally, we envisage that our approach can be applied in future studies addressing the role of dynamical structural strain in phase-change materials.
Festuca parodii Saint-Yves 1927
Creators: name: Ospina, Juan C.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Poales
Poaceae
Festuca
Festuca parodii

description: Festuca parodii Saint-Yves (1927: 308)
 Lectotype:— ARGENTINA. Catamarca: ‘ Pomán’, December 1909, L. R. Parodi 2342 (lectotype BAA 00000175! designated here, isolectotype LIL 505358!).
 Taxonomic notes:— Festuca parodii was described by St.-Yves (1927: 308) who cited two syntypes in the protologue: ‘ Argentine. Prov. de Catamarca: poman, Leg. L. R. Parodi, XII-1909 No 2342, <> (herb. Par., herb. St-Y)’. The specimen BAA 00000175 is chosen as lectotype because it bears a label with handwriting of the author and collector, as well as the date and location cited in the protologue. The specimen deposited in G, where St-Yves herbarium is now housed, was not found (L. Gautier pers. comm. 2015).
description: Published as part of Ospina, Juan C., 2016, New lectotypifications and new synonyms in Festuca (Poaceae, Pooideae, Loliinae) from the Central Andes, pp. 247-258 in Phytotaxa 247 (4) on page 255, DOI: 10.11646/phytotaxa.247.4.2, http://zenodo.org/record/13677533
Optomechanical lasers for inertial sensing
Creators: name: Wisniewski, Hayden
name: Richardson, Logan
name: Hines, Adam
name: Laurain, Alexandre
name: Guzman, Felipe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We have developed an inertially sensitive optomechanical laser by combining a Vertical-External-Cavity Surface-Emitting Laser with a monolithic fused silica resonator. By placing the external cavity mirror of the VECSEL onto the optomechanical resonator test mass, we create a sensor where external accelerations are directly transcribed onto the lasing frequency. We developed a proof-of-principle laboratory prototype and observe test mass oscillations at the resonance frequency of the sensor through the VECSEL lasing frequency, 4.18 +/- .03 Hz. In addition, we set up an ancillary heterodyne interferometer to track the motion of the mechanical oscillator's test mass, observing a resonance of 4.194 +/- 0.004 Hz. The interferometer measurements validate the VECSEL results, confirming the feasibility of using optomechanical lasers for inertial sensing.
Adsorption Performance of Pumice for The Removal of Chromium ( VI )
Creators: name: Bilisumma Tuji
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2022
Subjects: electroplating industry waste water, chromium, pumice

description: Heavy metals released to the environment from different industries affect the
 environment adversely. Chromium is amongst the heavy metals addressing substantial
 environmental problem if released to the environment. Electroplating industries are one
 among the so many sources of chromium (VI).
 Adsorption has been identified as one of the most promising mechanism for removal of
 dissolved heavy metal fractions and nutrients from waste water. Although commercial
 adsorbents are available for use in adsorption, they are very expensive which results in
 various new locally available adsorbents being studied by so many researchers.
 In this particular study, the chromium adsorption performance of locally available
 volcanic rock named pumice treated with acid was investigated. The adsorbent material
 collected was stage crushed and sieved to fine particle size and washed by sulfuric acid.
 The effects of independent variables on the Cr (VI) initial concentration were
 investigated.
 Chromium (VI) removal efficiency of 96.2% was achieved at the pH of 2. Equilibrium
 adsorption isotherm models were checked using experimental data. It was found that the
 adsorption was better represented by Freundlich adsorption isotherm model.
Proposal for photoacoustic ultrasonic generator based on Tamm plasmon structures
Creators: name: Girshova, Elizaveta I.
name: Mikitchuk, Alena P.
name: Belonovski, Alexey V.
name: Morozov, Konstantin M.
name: Ivanov, Konstantin A.
name: Pozina, Galia
name: Kozadaev, Konstantin V.
name: Egorov, Anton Yu.
name: Kaliteevski, Mikhail A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The scheme of generation of ultrasound waves based on optically excited Tamm plasmon structures is proposed. It is shown that Tamm plasmon structures can provide total absorption of a laser pulse with arbitrary wavelength in a metallic layer providing the possibility of the use of an infrared semiconductor laser for the excitation of ultrasound waves. Laser pulse absorption, heat transfer and dynamical properties of the structure are modeled, and the optimal design of the structure is found. It is demonstrated that the Tamm plasmon-based photoacoustic generator can emit ultrasound waves in the frequency band up to 100 MHz with pre-defined frequency spectrum. Optical power to sound power conversion efficiency grows linearly with frequency of the laser modulation and excitation power.
Probing the optical chiral response of single nanoparticles with optical tweezers
Creators: name: Ali, R.
name: Pinheiro, F. A.
name: Dutra, R. S.
name: Rosa, F. S. S.
name: Neto, P. A. Maia
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We propose an enantioselective scheme to sort homogeneous chiral particles using optical tweezers. For a certain range of material parameters, we show that a highly focused circularly-polarized laser beam traps particles of a specific chirality selected by the handedness of the trapping beam. Furthermore, by applying a transverse Stokes drag force that displaces the trapped particle off-axis, we allow for the rotation of the particle center-of-mass around the trapping beam axis. The rotation angle is highly dependent on the handedness of the trapped particle and is easily measurable with standard video-microscopy techniques, allowing for an alternative mechanism for chiral resolution. Our platform not only allows for enantioselection of particles dispersed in solution but also paves the way to the characterization of the chiral parameter of individual, homogeneous chiral microspheres using optical tweezing.
description: 9 pages, 5 figures
Mathematical Theory of Atomic Norm Denoising In Blind Two-Dimensional Super-Resolution (Extended Version)
Creators: name: Suliman, Mohamed A.
name: Dai, Wei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This paper develops a new mathematical framework for denoising in blind two-dimensional (2D) super-resolution upon using the atomic norm. The framework denoises a signal that consists of a weighted sum of an unknown number of time-delayed and frequency-shifted unknown waveforms from its noisy measurements. Moreover, the framework also provides an approach for estimating the unknown parameters in the signal. We prove that when the number of the observed samples satisfies certain lower bound that is a function of the system parameters, we can estimate the noise-free signal, with very high accuracy, upon solving a regularized least-squares atomic norm minimization problem. We derive the theoretical mean-squared error of the estimator, and we show that it depends on the noise variance, the number of unknown waveforms, the number of samples, and the dimension of the low-dimensional space where the unknown waveforms lie. Finally, we verify the theoretical findings of the paper by using extensive simulation experiments.
description: 22 pages