cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Influence of external potentials on heterogeneous diffusion processes
Creators: name: Kazakevicius, Rytis
name: Ruseckas, Julius
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In this paper we consider heterogeneous diffusion processes with the power-law dependence of the diffusion coefficient on the position and investigate the influence of external forces on the resulting anomalous diffusion. The heterogeneous diffusion processes can yield subdiffusion as well as superdiffusion, depending on the behavior of the diffusion coefficient. We assume that not only the diffusion coefficient but also the external force has a power-law dependence on the position. We obtain analytic expressions for the transition probability in two cases: when the power-law exponent in the external force is equal to 2eta-1, where 2eta is the power-law exponent in the dependence of the diffusion coefficient on the position, and when the external force has a linear dependence on the position. We found that the power-law exponent in the dependence of the mean square displacement on time does not depend on the external force, this force changes only the anomalous diffusion coefficient. In addition, the external force having the power-law exponent different from 2eta-1 limits the time interval where the anomalous diffusion occurs. We expect that the results obtained in this paper may be relevant for a more complete understanding of anomalous diffusion processes.
Boundary Element Method for Tangential Contact of a Coated Elastic Half-Space
Creators: name: Burger, Henning
name: Forsbach, Fabian
name: Popov, Valentin L.
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 500 Naturwissenschaften und Mathematik::530 Physik::530 Physik
subject: boundary element method
subject: tangential contact
subject: coatings
subject: contact mechanics
subject: coated surface

description: We present a formulation of the boundary element method (BEM) for simulating the tangential contact with an elastic half-space coated with an elastic layer with different elastic properties. We use the fast Fourier-transform-based formulation of BEM, while the fundamental solution is determined directly in the Fourier space. Numerical tests are validated by comparison with available asymptotic analytical solutions for a very thin and a very thick layer, as well as with FEM calculations for layers with finite thickness.
Gluon Distributions in Pseudoscalar Mesons on the Light Front
Creators: name: Lan, Jiangshan
name: Wu, Jiatong
name: Chen, Jialin
name: Mondal, Chandan
name: Zhao, Xingbo
name: Vary, James P.
Publisher: name: Zenodo
Year: 2022

description: Presentation at DIS2022
On Size Biased Kumaraswamy Distribution
Creators: name: Sharma, Dreamlee
name: Chakrabarty, Tapan Kumar
Publisher: name: arXiv
Year: 2016
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: 60E05, 62F10

description: In this paper, we introduce and study the size-biased form of Kumaraswamy distribution. The Kumaraswamy distribution which has drawn considerable attention in hydrology and related areas was proposed by Kumarswamy. The new distribution is derived under size-biased probability of sampling taking the weights as the variate values. Various distributional and characterizing properties of the model are studied. The methods of maximum likelihood and matching quantiles estimation are employed to estimate the parameters of the proposed model. Finally, we apply the proposed model to simulated and real data sets.
Putting 3D printing to good use—Additive Manufacturing and the Sustainable Development Goals
Creators: name: Muth, Jonathan
name: Klunker, Andre
name: Völlmecke, Christina
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 600 Technik, Medizin, angewandte Wissenschaften::670 Industrielle Fertigung::670 Industrielle Fertigung
subject: additive manufacturing
subject: 3D printing
subject: sustainability
subject: sustainable development goals
subject: sustainable development
subject: SDGs
subject: 3DP

description: Additive Manufacturing (AM), often referred to as 3D printing, is expected to have a high impact on the manufacturing industry as well as on society. The inherent characteristics of AM make it possible to help solve global challenges, which can be explored in reference to the 17 Sustainable Development Goals (SDGs) of the United Nations. This is the first paper that examines the connection of AM and the 17 SDGs through a literature review. In this work, it is outlined which SDGs have a high, moderate or low potential to be fostered by AM. The SDGs are introduced and corresponding studies relevant to the respective SDG are presented. It is found that six out of 17 SDGs have high potential to be promoted by AM. These are SDG 1 (No poverty), SDG 3 (Good Health and Wellbeing), SDG 4 (Quality Education), SDG 9 (Industry, Innovation, and Infrastructure), SDG 12 (Responsible Consumption and Production), and SDG 14 (Life below Water). Furthermore, two SDGs have been identified that have moderate potential to be cultivated by AM. These are SDG 7 (Affordable and Clean Energy) and SDG 10 (Reduced Inequalities).
The potential of robot eyes as predictive cues in HRI—an eye-tracking study
Creators: name: Onnasch, Linda
name: Schweidler, Paul
name: Schmidt, Helena
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 100 Philosophie und Psychologie::150 Psychologie::150 Psychologie
subject: human-robot interaction
subject: HRI
subject: attentional processes
subject: joint attention
subject: anthropomorphism
subject: robot design

description: Robots currently provide only a limited amount of information about their future movements to human collaborators. In human interaction, communication through gaze can be helpful by intuitively directing attention to specific targets. Whether and how this mechanism could benefit the interaction with robots and how a design of predictive robot eyes in general should look like is not well understood. In a between-subjects design, four different types of eyes were therefore compared with regard to their attention directing potential: a pair of arrows, human eyes, and two anthropomorphic robot eye designs. For this purpose, 39 subjects performed a novel, screen-based gaze cueing task in the laboratory. Participants’ attention was measured using manual responses and eye-tracking. Information on the perception of the tested cues was provided through additional subjective measures. All eye models were overall easy to read and were able to direct participants’ attention. The anthropomorphic robot eyes were most efficient at shifting participants’ attention which was revealed by faster manual and saccadic reaction times. In addition, a robot equipped with anthropomorphic eyes was perceived as being more competent. Abstract anthropomorphic robot eyes therefore seem to trigger a reflexive reallocation of attention. This points to a social and automatic processing of such artificial stimuli.
Characterization the Potential of Drinking Water Hardness Using Peanut Hull Adsorbent. (In Case of Mekelle City)
Creators: name: Tsegakiros, Fantay
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: This study focused on treatment technique using peanut hull to produce natural adsorbent for softening the tap water in Mekelle city which is hard water. Its physicochemical properties were examined. Water softening experiments were conducted to observe the changes in hardness causing Ca2+ and Mg2+ divalent ions total hardness, with varying dosages of peanut hull natural absorbent/coagulant. Characterization study before and after the treatment process of the peanut hull natural absorbent/ coagulant was conducted using FTIR and XRD in order to control the possible hardness removal mechanisms for hardness causing divalent ions (Ca2+& Mg2+) by identifying its functional groups. A total of 26 raw drinking tap water samples were collected from three different sites (Eyala, Ayder and Ayanalem) containing high concentration of hardness of the city used for domestic and other purposes. The hardness removal efficiency was compared with Ethiopian and WHO standards. The maximum hardness removal efficiency found to be 89.5%, by taking four factors at optimum conditions were attained at initial concentration divalent of ions 1.50 mg/l, coagulant dose 2.50 g/l, pH 6.5 and settling time 120 mini.
Analysis and Design of Simply Supported Pre-Stressed Precast-Cast In-Situ Concrete Composite Railway Bridges: Comparison of Ballasted and Slab Track Alternatives
Creators: name: Ashenafi, Oycha
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2015

description: Bridge is one of the most important components of railway line for development of transportation. It is known that Addis Ababa light rail transit project construction started two years ago. Also the construction of national railway project started. In these projects, the construction of bridges need highly skilled man power and highest construction cost. The railway bridge commonly contains two types of tracks which are ballasted and slab track. There is a difference in construction cost of bridge between ballasted track case and slab track case. Thus, this study has attempted to analyze, design and compare both ballasted and slab track type laying on the surface of bridge. This study mainly focuses on the superstructure of bridge supporting track rails attached to the bridge to support trains. The intention of this thesis is therefore to compare the construction cost of railway bridges with ballasted and slab track cases and to select the economical track type laying on the surface of railway bridge. Finally, from the overall analysis result of this thesis, the study conclude that slab track is economical than ballasted track for span length greater than 15m. On the other hand, ballasted track seems economical than slab track for span length less than 15m.
Oral-History.Digital – Eine digitale Forschungsumgebung für audiovisuelle narrative Interviews
Creators: name: Kley, Herdis
Publisher: name: Zenodo
Year: 2022
Subjects: Oral History
Interviews
Infrastruktur
Freie Universität Berlin

description: Oral-History.Digital ist eine Erschließungs- und Recherche-Plattform für audiovisuelle narrative Interviews. Sie unterstützt sammelnde Institutionen und Forschungsprojekte bei der Archivierung, Erschließung und Bereitstellung ihrer Bestände. Außerdem bietet sie Forschenden Möglichkeiten zur sammlungsübergreifenden Recherche, Annotation und Auswertung von Interviews als Forschungsdaten.
description: Förderung: Deutsche Forschungsgemeinschaft (DFG) – Projektnummer 437972564
The $ε$-expansion of the codimension two twist defect from conformal field theory
Creators: name: Yamaguchi, Satoshi
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We apply the framework of Rychkov-Tan arXiv:1505.00963 to the codimension two twist defect at the Wilson-Fisher fixed point in $4-ε$ dimensions. We obtain the scaling dimensions of the operators on the defect up to the lowest nontrivial order in the $ε$-expansion without using Feynman diagram computation. Our results agree with the known results.
description: 5 pages. v2, v3: typos corrected
Photometric and Spectroscopic Study of the Supergiant with an Infrared Excess V1027 Cygni
Creators: name: Arkhipova, V. P.
name: Taranova, O. G.
name: Ikonnikova, N. P.
name: Esipov, V. F.
name: Komissarova, G. V.
name: Shenavrin, V. I.
name: Burlak, M. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present the results of our $UBV$ and $JHKLM$-photometry for the semiregular pulsating variable V1027~Cyg, a supergiant with an infrared excess, over the period from 1991 to 2015. Our search for a periodicity in the $UBV$ brightness variations has led to several periods from $P=212^{d}$ to $P=320^{d}$ in different time intervals. We have found the period $P=237^{d}$ based on our infrared photometry. The variability amplitude, the light-curve shape, and the magnitude of V1027~Cyg at maximum light change noticeably from cycle to cycle. An ambiguous correlation of the $B-V$ and $U-B$ colors with the brightness has been revealed. The spectral energy distribution for V1027~Cyg from our photometry in the range 0.36 ($U$)-5.0 ($M$) $μ$m corresponds to spectral types from G8I to K3I at different phases of the pulsation cycle. Low-resolution spectra of V1027 Cyg in the range $λ$4400--9200 Å were taken during 16 nights over the period 1995--2015. At the 1995 and 2011 photometric minima the star's spectrum exhibited molecular TiO bands whose intensity corresponded to spectral types M0--M1, while the photometric data point to a considerably earlier spectral type. We hypothesize that the TiO bands are formed in the upper layers of the extended stellar atmosphere. We have measured the equivalent widths of the strongest absorption lines, in particular, the infrared Ca~II triplet in the spectrum of V1027~Cyg. The calcium triplet (Ca T) with $W_λ(\mathrm{Ca~T})=20.3\pm1.8$ Å as a luminosity indicator for supergiants places V1027 Cyg in the region of the brightest G--K supergiants. V1027 Cyg has been identified with the infrared source IRAS~20004+2955 and is currently believed to be a candidate for post-AGB stars. The evolutionary status of the star and its difference from other post-AGB objects are discussed.
description: 21 pages, 15 figures, 5 tables, accepted for publication in Pis'ma Astron. Zh. (Astronomy Letters)
OstData Präsentation "Inter- und transdisziplinäres Forschungsdatenmanagement in der Ost-, Ostmittel- und Südosteuropaforschung"
Creators: name: Frank, Ingo
name: Štanzel, Arnošt
Publisher: name: Zenodo
Year: 2021
Subjects: subject: Forschungsdatenmanagement, Präsentation, Interdisziplinarität, Forschungsdaten, Metadatenschema, Area Studies
subject: gnd:1098579690
subject: gnd:4177424-3

description: Der Foliensatz besteht aus einer überarbeiteten und leichtfügig ergänzten Version der Präsentation, die das OstData-Projektteam während der Online-Konferenz "FORGE21" vom 8.-10.09.2021 präsentiert hat.
description: Das Projekt "OstData - Forschungsdatendienst für die Ost-, Ostmittel- und Südosteuropaforschung" wird von der Deutschen Forschungsgemeinschaft (DFG) gefördert.
Assessment of Cost and Time Overrun in Addis Djibouti Railway Project
Creators: name: Biniyam, Ayele
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2019

description: Transportation is the back bone of a nation's economic activities. Mass transit system like rail systems shall be constructed for efficient transportation. The railway connecting Ethiopia with Djibouti was a meter gauge line opened in 1917. A new line contract was awarded to China Civil Engineering Construction Corporation (CCECC ) and China Railway Engineering Corporation (CREC ) having double track for the first 115 Km from Addis Ababa to Adama, and single track for the remaining 600Km to Djibouti. The huge investment in the project and import export importance of the line were a case for evaluating the presence and cause of cost and time overrun. Since time overrun has a high attribute to cost overrun, in this thesis the time and cost overruns of the project had been assessed. This research assessed the effect of amendment on cost overrun and the increased out goings of the foreign currency. Questionnaire survey has been conducted on a total of 28 respondents from client, contractors and client representative to model the cause factors of project overrun using Partial Least Square (PLS ) approach via SmartplsV3 software package, to assess the cost and time management practice of the project and rank the major impacts of cost and time overrun using Relative Importance Index (RII ). In addition, a detailed archival document review was conducted to get the actual essence of cost and time overrun of the project. Findings of the research shows that, Project Management and Contract Administration related factors (PMCAR ) are the most significant construct or group of factors causing cost and time overrun. Following PMCAR, Financial and Time Management related factors affects cost overrun, while Contractor's Site Management related factors (CSMR ) affect time overrun respectively. Delayed compensation payments, drainage of foreign currency and lost economical contribution of the project in terms of Time value of money were main impacts of Cost and Time overrun of the Addis-Djibouti railway project. Power supply issues and design changes were the most significant factors which exposed the project to time overrun. Unfinalyzed feasibility study brought many amendments and cost overrun to the three EPC contracts of the project.
Partial discharge detection and location on high voltage power cables
Creators: name: Bidhendi., Hossein Nabi
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
title: No warming in the eastern Gulf of Mexico since 1845 recorded by a Siderastrea siderea coral from Cuba
Creators: name:  Harbott , Marie
name:  Wu , Henry C.
name:  Kuhnert , Henning
name:  Kasemann , Simone
name:  Meixner , Anette
name:  Jimenez , Carlos
name:  González-Díaz , Patricia
name:  Rixen , Tim
Publisher: name: Deutsche Geologische Gesellschaft - Geologische Vereinigung e.V. (DGGV)
Year: 2021

description: Changes in the surface ocean pH and temperature caused by the uptake of anthropogenic CO2 are posing a threat to calcifying marine organisms. Recent studies have observed significant impacts on coral reef ecosystems with impaired carbonate skeletal growth and decreased calcification due to acidifying oceans. The current coverage of observations for the northwestern Cuban coastal waters provides an incomplete picture of natural climate variability over interannual to interdecadal timescales, showing the need for high resolution climate archives. Cuba is situated between densely populated landmasses of North and South America offering a unique environment to study multiple aspects of anthropogenic activity across the region as well as their interconnectivity. Sub-seasonally resolved sea surface temperature (SST), δ18O of seawater, and carbonate chemistry parameters were reconstructed from a massive Siderastrea siderea coral from Cuba’s northwestern coast through a multi-proxy approach since the preindustrial era. Trace element ratios as proxies of SST indicate no significant increase in temperature over the past 160 years since 1845. Over the same time period, coral skeletal δ11B ratio decreased by ca. 1.6 ‰, translating into a decrease of 0.1 on the pH scale, reflecting the acidification of the northwestern Cuban coastal waters. Furthermore, an accelerating depletion of coral δ13C from the 1850s to 2005 of 1.5 ‰ demonstrates the changes in seawater CO2 with an anthropogenic imprint due to increased fossil fuel combustion. Further investigation and the comparison to trace elements indicate possible baseline shifts in regional seawater carbonate chemistry that has been affected by anthropogenic activity.
QCD, with Strings Attached
Creators: name: Guijosa, Alberto
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In the nearly twenty years that have elapsed since its discovery, the gauge-gravity correspondence has become established as an efficient tool to explore the physics of a large class of strongly-coupled field theories. A brief overview is given here of its formulation and a few of its applications, emphasizing attempts to emulate aspects of the strong-coupling regime of quantum chromodynamics (QCD). To the extent possible, the presentation is self-contained, and in particular, it does not presuppose knowledge of string theory.
description: Invited review article, 32 pages of text plus lots of references
YouSkyde: Information Hiding for Skype Video Traffic
Creators: name: Mazurczyk, Wojciech
name: Karas, Maciej
name: Szczypiorski, Krzysztof
name: Janicki, Artur
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cryptography and Security (cs.CR)
subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: In this paper a new information hiding method for Skype videoconference calls - YouSkyde - is introduced. A Skype traffic analysis revealed that introducing intentional losses into the Skype video traffic stream to provide the means for clandestine communication is the most favourable solution. A YouSkyde proof-of-concept implementation was carried out and its experimental evaluation is presented. The results obtained prove that the proposed method is feasible and offer a steganographic bandwidth as high as 0.93 kbps, while introducing negligible distortions into transmission quality and providing high undetectability.
description: 16 pages, 10 figures
Defining the q-analogue of a matroid
Creators: name: Jurrius, Relinde
name: Pellikaan, Ruud
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 05B35, 94B99

description: This paper defines the q-analogue of a matroid and establishes several properties like duality, restriction and contraction. We discuss possible ways to define a q-matroid, and why they are (not) cryptomorphic. Also, we explain the motivation for studying q-matroids by showing that a rank metric code gives a q-matroid.
description: 35 pages
Confined flow vortex breakdown study and modeling of mixing in a stirred vessel
Creators: name: Mununga., Lewis
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Water Quality Analysis and Pollution Prevention Options of Lake Ziway, Around Ziway City
Creators: name: Demeke, Fantaw
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: Water is a key factor for ecological balance and to support biodiversity. But it is getting polluted as a result of human interventions and natural phenomenon. Lake Ziway is one of the surface waters getting devastating effects from floriculture farms, agricultural practices, and irrigation schemes and usage of chemicals. The objective of this thesis is to analyze the pollution status of the Lake. Water samples were collected and laboratory analysis was done for color, odor, pH, EC, TDS, turbidity, ammonia, total hardness, sodium, potassium, total iron, manganese, calcium, magnesium, alkalinity, bicarbonate, chloride, Sulphate, nitrate, nitrite, fluoride, phosphate, DO, BOD and COD at seven sites from February to March in 21 runs. Sediment samples were also taken from four sampling sites and analysis was done for pH, EC, CEC, total iron, manganese, total nitrogen and total phosphorus in the same period with water quality analysis in12 runs. The results were compared with WHO's drinking water quality guide lines and also the datasets were evaluated statistically. The mean values of turbidity, manganese, BOD and COD levels exceed the WHO standards. All water quality parameters have a significance values of P≤ 0.05 for spatial variation except BOD and COD that have P- values of 0.196 and 0.143 respectively. Whereas the significant temporal variations are only observed for potassium (0.03), BOD (0.001) and COD (0.002). The dendrogram diagram shows two significant clusters for both water and sediment samples. Generally, the results revealed that the major causes of water quality deterioration are inflow of effluents from the floriculture industries, domestics, agricultural practices, saline seeps and other uncontrolled human interventions as observed in sites one, two, three, four and five. The other cause results from people's activities in boats and islands. Run off, silt, waste effluents and etc. also are taken to be the causes of the lakes pollutions as shown in cluster one. Constructed buffer zones, waste water treatment and recycling, integrated pest management practices, proper disposal of liquid and solid wastes and other BMPs are recommended prevention and treatment options to safeguard water quality.
Extent of Adhesion Losses in The Wheel- Rail Contact Under Contaminated Conditions
Creators: name: Mesfin, Gebretsadik
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2014

description: Railway vehicles require a certain level of adhesion between wheel and rail to operate efficiently, reliably, and economically. Different levels of adhesion are needed depending on the vehicle running conditions. In the wheel tread–railhead contact, the dominant problem is low adhesion, as low adhesion on the railhead negatively affects railway operation: on one hand, the vehicle will lose traction resulting in delay when driving on low-adhesion tracks; on the other hand, low adhesion during deceleration will extend the braking distance, which is a safety issue. This thesis examines the influence of several contaminants, i.e., water, mud, leaves, oil and grease, on the adhesion in the wheel tread–railhead contact. This study will also improve our knowledge of the low-adhesion mechanism and of how various contaminants influence adhesion. In this thesis, the adhesion conditions were assessed using a twin disc test machine. Thus the research methodology used was a laboratory test; the aim of which was to study the extent of adhesion coefficients over a range of slip values with and without contaminants. Thus the outcomes from lab test were the coefficients of adhesions of each contaminant within 0 to 10% slip values so as to sort out which of them are the worst to cause loss of adhesion. With this regard oil and grease have been found to create less adhesion than leaves unlike the researches made abroad so far.
Chrome Removal from Wastewater Using Water Treatment Plant Sludge as An Adsorbent
Creators: name: Deriba, Wegene
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2015

description: Industries produces large amount of waste and the effluent of these wastes are often hazardous in polluting the environment and affecting human health. Tanneries are among industries which release large amount of waste which contains hazardous heavy metals such as chromium. Hexavalent chromium in the environment is often harmful and it should be treated before releasing to the environment. Chromium carcinogenicity to humans and other living organisms has promulgated extensive research on its treatment technologies with varying levels of success. The present study deals with removal of Cr(VI) by alum based water treatment sludge (Al- WTS) through batch and fixed bed column study. Response surface methodology (RSM) was applied in batch wise experiment for designing and analysis of experiment. Cr(VI) concentration and pH increase, is shown to decrease chrome removal percent, while adsorbent dose and shaking time increase, is shown to increase chrome removal. Factor interaction terms: Cr(VI) concentration with pH shows that maximum chrome removal 95.62.1% was obtained at Cr(VI) concentration of 2.4mg/l and pH 2.45, while interaction of Cr(VI) concentration and adsorbent dose shows, 97.06% chrome removal was obtained at chrome concentration of 3.3mg/L and adsorbent dose of 6.3g. Interaction of pH and adsorbent dose also shows that maximum chrome removal 92.2 was obtained at pH 2.44 and adsorbent dose of 6.17g. Theoretical Langmuir, Freundlich isotherms are subjected to adsorption data to estimate adsorption capacity. The results gained from this study were well described by the theoretical Langmuir and maximum adsorptive capacity of 33.33mg/g was obtained. The removal of Cr(VI) by Al-WTS was also investigated in a fixed bed column study. Experiments were conducted to study the effect of bed depth (10–30cm), flowrate (5– 15mL/min) and initial concentration (10-30mg/L). The column data was fitted by BDST, Thomas and Yoon-Nelson models. Adsorption capacity increases with increase in initial Cr(VI) concentration and bed depth. Thomas model well fits the experiment and gives high adsorptive capacity of 14.8mg/L. Al-WTS was used for the Cr(VI) removal from tannery wastewater in fixed bed column study and showed a high potential for the wastewater treatment. Key words: Alum based water treatment sludge, batch adsorption, response surface methodology, Cr(VI), fixed bed column
The investigations of segregation mechanisms in vertically vibrated granular beds
Creators: name: Muniandy., Kanni
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
No Timing Variations Observed in Third Transit of Snow-Line Exoplanet Kepler-421b
Creators: name: Dalba, Paul A.
name: Muirhead, Philip S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We observed Kepler-421 during the anticipated third transit of the snow-line exoplanet Kepler-421b in order to constrain the existence and extent of transit timing variations (TTVs). Previously, the Kepler Spacecraft only observed two transits of Kepler-421b leaving the planet's transit ephemeris unconstrained. Our visible light, time-series observations from the 4.3-meter Discovery Channel Telescope were designed to capture pre-transit baseline and the partial transit of Kepler-421b barring significant TTVs. We use the light curves to assess the probabilities of various transit models using both the posterior odds ratio and the Bayesian Information Criterion (BIC) and find that a transit model with no TTVs is favored to 3.6-sigma confidence. These observations suggest that Kepler-421b is either alone in its system or is only experiencing minor dynamic interactions with an unseen companion. With the Kepler-421b ephemeris constrained, we calculate future transit times and discuss the opportunity to characterize the atmosphere of this cold, long-period exoplanet via transmission spectroscopy. Our investigation emphasizes the difficulties associated with observing long-period exoplanet transits and the consequences that arise from failing to refine transit ephemerides.
description: 6 pages, 3 figures, 2 tables. Accepted to ApJ Letters on June 29, 2016
Supporting novel biomedical research via multilayer collaboration networks
Creators: name: Kuzmin, Konstantin
name: Lu, Xiaoyan
name: Mukherjee, Partha Sarathi
name: Zhuang, Juntao
name: Gaiteri, Chris
name: Szymanski, Boleslaw K
Publisher: name: arXiv
Year: 2016
Subjects: subject: Social and Information Networks (cs.SI)
subject: Biomolecules (q-bio.BM)
subject: Molecular Networks (q-bio.MN)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: The value of research containing novel combinations of molecules can be seen in many innovative and award-winning research programs. Despite calls to use innovative approaches to address common diseases, an increasing majority of research funding goes toward "safe" incremental research. Counteracting this trend by nurturing novel and potentially transformative scientific research is challenging, it must be supported in competition with established research programs. Therefore, we propose a tool that helps to resolve the tension between safe but fundable research vs. high-risk but potentially transformational research. It does this by identifying hidden overlapping interest around novel molecular research topics. Specifically, it identifies paths of molecular interactions that connect research topics and hypotheses that would not typically be associated, as the basis for scientific collaboration. Because these collaborations are related to the scientists' present trajectory, they are low risk and can be initiated rapidly. Unlike most incremental steps, these collaborations have the potential for leaps in understanding, as they reposition research for novel disease applications. We demonstrate the use of this tool to identify scientists who could contribute to understanding the cellular role of genes with novel associations with Alzheimer's disease, which have not been thoroughly characterized, in part due to the funding emphasis on established research.
Design and Simulation of Gas Insulated Substation (GIS) for Electrified Railway System: Case study of Shiro Meda
Creators: name: Mengistu, Asres
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2016

description: Nowadays the demand for Gas Insulated Substation (GIS) is increasing over the world for efficient utilization of electric power and space. In this thesis a gas insulated substations is investigated or studied since they are more advantageous though, they use same protective devices or equipment when compared to air insulated substations. They are compact, requiring little maintenance, more reliable, have longer service life (more than 50 years) and safer. The compactness is due to the use of SF6 gas, which has high dielectric strength at moderate pressure for phase to phase and phase to ground insulation. Gas insulated substation system creates a vision of the future more efficient substations which includes various technical, economic and environmental criteria, such as reliability, cost, interoperability, re-configurability, security, controllability and flexibility need to be considered. In this one of Addis Ababa Light rail transit (LRT) gas insulated substation has been studied, analyzed and compared to conventional air insulated substation. This thesis work presents the design and simulation of gas insulated substation for the case of Shiro Meda. For this purpose, all the necessary electrical parameters data are collected through literature survey and from Ethiopian electric utility at the same time major components of gas insulated substation such as bus bar is designed consequently volume of SF6 is calculated. For designing a substation it is crucial to know the maximum value of short circuit current of substation and load flow analysis. For this purpose Electrical Transient Analyzer Program (ETAP) power 12.6.0 version has been used for numerous fault condition in 3 phase132kV gas insulated substation. The load flow analysis and short circuit for different bus have been done and the result is within limit according to the IEC 60909 and IEC 61363 standard. However, our design results 12.5 and 90 and 92% reduction the cost of maintenance, space and operation by 12.5 and 90 and 92% respectively compared to air insulated substation.
On the relation between activity-related frequency shifts and the sunspot distribution over the solar cycle 23
Creators: name: Santos, A. R. G.
name: Cunha, M. S.
name: Avelino, P. P.
name: Chaplin, W. J.
name: Campante, T. L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The activity-related variations in the solar acoustic frequencies have been known for 30 years. However, the importance of the different contributions is still not well established. With this in mind, we developed an empirical model to estimate the spot-induced frequency shifts, which takes into account the sunspot properties, such as area and latitude. The comparison between the model frequency shifts obtained from the daily sunspot records and those observed suggests that the contribution from a stochastic component to the total frequency shifts is about 30%. The remaining 70% is related to a global, long-term variation. We also propose a new observable to investigate the short- and mid-term variations of the frequency shifts, which is insensitive to the long-term variations contained in the data. On the shortest time scales the variations in the frequency shifts are strongly correlated with the variations in the total area covered by sunspots. However, a significant loss of correlation is still found, which cannot be fully explained by ignoring the invisible side of the Sun when accounting for the total sunspot area. We also verify that the times when the frequency shifts and the sunspot areas do not vary in a similar way tend to coincide with the times of the maximum amplitude of the quasi-biennial variations found in the seismic data.
description: 4 pages, 2 figures, proceedings of the Joint TASC2 - KASC9 Workshop - SPACEINN - HELAS8 Conference "Seismology of the Sun and the Distant Stars 2016: Using Today's Successes to Prepare the Future". To be published by the EPJ Web of Conferences
Effective three particle forces in polyvalent atoms
Creators: name: Kozlov, M. G.
name: Safronova, M. S.
name: Porsev, S. G.
name: Tupitsyn, I. I.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We study effective three-particle interactions between valence electrons, which are induced by the core polarization. Such interactions are enhanced when valence orbitals have strong overlap with the outermost core shell, in particular for the systems with partially filled f-shell. We find that in certain cases the three-particle contributions are large, affecting the order of energy levels, and need to be included in high-precision calculations.
description: revtex4, 6 pages; v.2: discussion of the accuracy added and other small changes
Rhodamine B as a probe for phase transition in liquid solutions
Creators: name: Shishkin, Ivan
name: Alon, Tmiron
name: Dagan, Ronen
name: Ginzburg, Pavel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Local environment of fluorescent dyes could strongly affect emission dynamics of the latter. In particular, both signal intensities and emission lifetimes are highly sensitive to solvent temperatures. Here, temperature-dependent behavior Rhodamine B fluorescence in water and ethanol solutions was experimentally investigated. Phase transition point of liquid water to ice was shown to have a dramatic impact on both in intensity (30-fold drop) and in lifetime (from 2.68ns down to 0.13ns) of the dye luminescence along with the spectral shift of spectral maxima from 590 to 625nm. At the same time, ethanol solvent does not lead any similar behavior. The reported results and approaches enable further investigations of dye-solvent interactions and studies of physical properties of liquids at phase transition points.
Rheological and degradation studies of drag-reducing solutions
Creators: name: Moussa., Tony
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Propuesta para recategorizar como Parque Nacional a las Cascadas de Agua Azul, Chiapas, México
Creators: name: Niño Gutiérrez, Naú Silvero
Publisher: name: figshare
Year: 2023
Subjects: Other environmental sciences not elsewhere classified

description: El estudio hace enfasis sobre la grave y compleja problematica que afecta al: Área Natural Protegida Cascadas de Aguas Azul, afectada por: su incongurencia juridica respecto a si actual categoria de manejo (Área de Protección de Flora y Fuana), el evidente abondano oficial en su gestion administratriva y el avanzado impacto ecologico traducido en deterioro de recursos naturales y alteracion paisajistica; diagnostico con base en el cual dicha area se redelimita, rescantando los valores naturales mas sobresalientes y cuyos atributos para fines de manejo planificado, facultan a recategorizar a las Cascadas de Agua Azul bajo la figura protectiva de Parque Nacional.
Observing the formation of flare-driven coronal rain
Creators: name: Scullion, E.
name: Van Der Voort, L. Rouppe
name: Antolin, P.
name: Wedemeyer, S.
name: Vissers, G.
name: Kontar, E. P.
name: Gallagher, P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Flare-driven coronal rain can manifest from rapidly cooled plasma condensations near coronal loop-tops in thermally unstable post-flare arcades. We detect 5 phases that characterise the post-flare decay: heating, evaporation, conductive cooling dominance for ~120 s, radiative / enthalpy cooling dominance for ~4700 s and finally catastrophic cooling occurring within 35-124 s leading to rain strands with s periodicity of 55-70 s. We find an excellent agreement between the observations and model predictions of the dominant cooling timescales and the onset of catastrophic cooling. At the rain formation site we detect co-moving, multi-thermal rain clumps that undergo catastrophic cooling from ~1 MK to ~22000 K. During catastrophic cooling the plasma cools at a maximum rate of 22700 K s-1 in multiple loop-top sources. We calculated the density of the EUV plasma from the DEM of the multi-thermal source employing regularised inversion. Assuming a pressure balance, we estimate the density of the chromospheric component of rain to be 9.21x10^11 +-1.76x10^11 cm-3 which is comparable with quiescent coronal rain densities. With up to 8 parallel strands in the EUV loop cross section, we calculate the mass loss rate from the post-flare arcade to be as much as 1.98x10^12 +/-4.95x10^11 g s-1. Finally, we reveal a close proximity between the model predictions of 10^5.8 K and the observed properties between 10^5.9 K and 10^6.2 K, that defines the temperature onset of catastrophic cooling. The close correspondence between the observations and numerical models suggests that indeed acoustic waves (with a sound travel time of 68 s) could play an important role in redistributing energy and sustaining the enthalpy-based radiative cooling.
description: 23 pages, 21 figures
The properties of hypervelocity stars and S-stars originating from an eccentric disc around a supermassive black hole
Creators: name: Subr, Ladislav
name: Haas, Jaroslav
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Hypervelocity stars (HVSs) that are observed in the Galactic halo, are believed to be accelerated to large velocities by a process of tidal disruption of binary stars passing close to a supermassive black hole (SMBH) which resides in the center of the Galaxy. It is, however, still unclear, where these relatively young stars were born and which dynamical process pushed them to nearly radial orbits around the SMBH. In this paper we investigate the possibility that the young binaries originated from a thin eccentric disc, similar to the one observed in the Galactic center nowadays. By means of direct N-body simulations, we follow the dynamical evolution of an initially thin and eccentric disc of stars with a 100% binary fraction orbiting around the SMBH. Such a configuration leads to Kozai-Lidov oscillations of orbital elements, bringing considerable amount of binaries to close vicinity of the black hole. Subsequent tidal disruption of these binaries accelerates one of their component to velocities well above the escape velocity from the SMBH while the second component becomes tightly bound to the SMBH. We describe the main kinematic properties of the escaping and tightly bound stars within our model and compare them qualitatively to the properties of the observed HVSs and S-stars, respectively. The most prominent feature is a strong anisotropy in the directions of the escaping stars which is observed for the Galactic HVSs but not explained yet.
description: accepted for publication in ApJ
Thermalization of Fermionic Quantum Walkers
Creators: name: Hamza, Eman
name: Joye, Alain
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 82C41, 82C10

description: We consider the discrete time dynamics of an ensemble of fermionic quantum walkers moving on a finite discrete sample, interacting with a reservoir of infinitely many quantum particles on the one dimensional lattice. The reservoir is given by a fermionic quasifree state, with free discrete dynamics given by the shift, whereas the free dynamics of the non-interacting quantum walkers in the sample is defined by means of a unitary matrix. The reservoir and the sample exchange particles at specific sites by a unitary coupling and we study the discrete dynamics of the coupled system defined by the iteration of the free discrete dynamics acting on the unitary coupling, in a variety of situations. In particular, in absence of correlation within the particles of the reservoir and under natural assumptions on the sample's dynamics, we prove that the one- and two-body reduced density matrices of the sample admit large times limits characterized by the state of the reservoir which are independent of the free dynamics of the quantum walkers and of the coupling strength. Moreover, the corresponding asymptotic density profile in the sample is flat and the correlations of number operators have no structure, a manifestation of thermalization.
Compton Thick AGN in the 70 Month Swift-BAT All-Sky Hard X-ray Survey: a Bayesian approach
Creators: name: Akylas, A.
name: Georgantopoulos, I.
name: Ranalli, P.
name: Gkiokas, E.
name: Corral, A.
name: Lanzuisi, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The 70-month Swift/BAT catalogue provides a sensitive view of the extragalactic X-ray sky at hard energies (>10 keV) containing about 800 Active Galactic Nuclei. We explore its content in heavily obscured, Compton-thick AGN by combining the BAT (14-195 keV) with the lower energy XRT (0.3-10 keV) data. We apply a Bayesian methodology using Markov chains to estimate the exact probability distribution of the column density for each source. We find 53 possible Compton-thick sources (with probability 3 to 100%) translating to a ~7% fraction of the AGN in our sample. We derive the first parametric luminosity function of Compton-thick AGN. The unabsorbed luminosity function can be represented by a double power-law with a break at $L_{\star} 2 \times 10^{42}$ $\rm ergs~s^{-1}$ in the 20-40 keV band.
description: 13 pages, 9 figures