cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
IMPROVING THE PHOTOCATALYTIC ACTIVITY OF TIO2 FOR ENVIRONMENTAL APPLICATIONS: EFFECTS OF DOPING AND OF SURFACE MODIFICATION
Creators: name: DOZZI, MARIA VITTORIA
Publisher: name: Universit� degli Studi di Milano
Year: 2012

description: Different routes were explored for the solution of the two limiting aspects of TiO2 use in photocatalytic processes, i.e. its large band gap, allowing the exploitation of only a small portion of sunlight, and the fast recombination of photoproduced electron-hole pairs. The attention was first focused on the consequences of noble metal nanoparticles deposition on TiO2, with a systematic study on the photocatalytic performance of commercial TiO2 bearing gold nanoparticles deposited either by so-called deposition-precipitation, with particular attention to the method, either thermal or chemical, employed to reduce the Au(III) precursor into metallic gold, or by photodeposition. Two organic substrates, i.e. the azo dye Acid Red 1 and formic acid, were mainly employed as substrates in photocatalytic oxidative degradation kinetic tests. In order to minimize the major drawback of TiO2 as a photocatalytic material, i.e. its high-energy band gap, sulphur, fluorine and boron were tested as dopants of TiO2. Doped materials prepared by the sol-gel method, containing different nominal dopant amounts and calcined at different temperatures, were systematically investigated in both liquid and gas phase photocatalytic reactions under polychromatic irradiation. Furthermore, the photo-oxidation of acetic acid was also investigated systematically as a function of irradiation wavelength, by collecting so-called action spectra, which represent the most powerful photocatalytic characterization tool to determine the effective wavelength-dependent response and activity of a photocatalyst. The comparison between the shapes of the absorption and the action spectra of the materials allowed one to distinguish between absorption features which are active or inactive in photocatalysis. XPS and EPR analyses gave an essential contribution in order to correlate extra absorption peaks to the chemical composition of doped-TiO2. Finally, the effect of noble metal (Pt and Au) nanoparticles photodeposition on the activity of the best performing doped TiO2 photocatalysts calcined at 700�C was investigated in both energetically down-hill and up-hill reactions, i.e. in formic acid and acetic acid degradation in aqueous suspension and in hydrogen production from methanol/water vapor mixtures. Intriguing synergistic effects of TiO2 doping and of noble metal nanoparticles deposition were observed in both types of reaction.
Event reconstruction techniques for the wide-angle air Cherenkov detector HiSCORE
Creators: name: Hampf, Daniel
name: Tluczykont, Martin
name: Horns, Dieter
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Wide-angle, non-imaging air Cherenkov detectors provide a way to observe cosmic gamma-rays which is complementary to observations by imaging Cherenkov telescopes. Their particular strength lies in the multi-TeV to ultra high energy range (E > 30 TeV), where large effective areas, yet small light sensitive areas per detector station are needed. To exploit this potential to full extent, a large station spacing is required to achieve a large effective area at a reasonable effort. In such a detector, the low number of signals per event, the absence of imaging information, and the poor signal to noise ratio of Cherenkov light to night sky brightness pose considerable challenges for the event reconstruction, especially the gamma hadron separation. The event reconstruction presented in this paper has been developed for the wide-angle detector HiSCORE, but the concepts may be applied more generically. It is tested on simulated data in the 10 TeV to 5 PeV energy range. For the tests, a regular grid of 22 x 22 detector stations with a spacing of 150 m is assumed, covering an area of 10 km^2. The angular resolution of individual events is found to be about 0.3 degree near the energy threshold, improving to below 0.1 degree at higher energies. The relative energy resolution is 20% at the threshold and improves to 10% at higher energies. Several parameters for gamma hadron separation are described. With a combination of these parameters, 80% to 90% of the hadronic background can be suppressed, while about 60% of the gamma-ray events are retained. The point source sensitivity to gamma-ray sources is estimated, with conservative assumptions, to be about 8 x 10^(-13) erg / s / cm^2 at 100 TeV gamma-ray for a 10 km^2 array. With more optimistic assumptions, and a 100 km^2 array, a sensitivity of about 1 x 10^(-13) erg / s / cm^2 can be achieved (at 100 TeV).
description: 12 pages, 13 figures, submitted to Nucl. Instr. Meth. Phys. Res. A, 2013
Nematic droplets in aqueous dispersions of carbon nanotubes
Creators: name: Puech, Nicolas
name: Grelet, Eric
name: Poulin, Philippe
name: Blanc, Christophe
name: van der Schoot, Paul
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Aqueous dispersions of exfoliated, bile-salt stabilized single-wall carbon nanotubes exhibit a first order transition to a nematic liquid-crystalline phase. The nematic phase presents itself in the form of micron-sized nematic droplets also known as tactoids, freely floating in the isotropic host dispersion. The nematic droplets are spindle shaped and have an aspect ratio of about four, irrespective of their size. We attribute this to a director field that is uniform rather than bipolar, which is confirmed by polarization microscopy. It follows that the ratio of the anchoring strength and the surface tension must be about four, which is quite larger than predicted theoretically but in line with earlier observations of bipolar tactoids. From the scatter in the data we deduce that the surface tension of the coexisting isotropic and nematic phases must be extremely low, that is, of the order of nN/m.
description: 4 pages, 5 figures
DASTURLASH TEXNOLOGIYALARI: ASOSIY TUSHUNCHA VA MAVZU YO'NALISHLARI
Creators: name: Uzakbaeva, S.
name: Baxitjanova, K.
Publisher: name: Zenodo
Year: 2023

description: Bu maqolada dasturlashning asosiy mezonlarini tushuntirish va ularning dastur yaratish, tahlil qilish, muammolarni yechish, ta'lim va boshqarish sohalarida qanday foydalanishga imkon berishini taqdim etildi. Dasturlashning muhimligi va kompyuter dasturlash tillari orqali asosiy tushunchalar va tuzilmalar o'rgatilishining maqsadi tushuntirilgan. Shuningdek, dasturlashning biznes, ta'lim va muhandislik sohalarida qanday muhim ahamiyatga ega bo'lganligi izohlangan.
Low transverse emittance electron bunches from two-color laser-ionization injection
Creators: name: Yu, Lu-Le
name: Esarey, Eric
name: Vay, Jean-Luc
name: Schroeder, Carl B.
name: Benedetti, Carlo
name: Geddes, Cameron G. R.
name: Rykovanov, Sergey G.
name: Bulanov, Stepan S.
name: Chen, Min
name: Leemans, Wim P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: A method is proposed to generate low emittance electron bunches from two color laser pulses in a laser-plasma accelerator. A two-region gas structure is used, containing a short region of a high-Z gas (e.g., krypton) for ionization injection, followed by a longer region of a low-Z gas for post-acceleration. A long-laser-wavelength (e.g., 5 micron) pump pulse excites plasma wake without triggering the inner-shell electron ionization of the high-Z gas due to low electric fields. A short-laser-wavelength (e.g., 0.4 micron) injection pulse, located at a trapping phase of the wake, ionizes the inner-shell electrons of the high-Z gas, resulting in ionization-induced trapping. Compared with a single-pulse ionization injection, this scheme offers an order of magnitude smaller residual transverse momentum of the electron bunch, which is a result of the smaller vector potential amplitude of the injection pulse.
Multiresolution wavelet analysis applied to GRACE range rate residuals
Creators: name: Behzadpour, Saniya
name: Mayer-Gürr, Torsten
name: Flury, Jakob
name: Klinger, Beate
name: Goswami, Sujata
Publisher: name: Göttingen : Copernicus GmbH
Year: 2019
Subjects: subject: Ranging
subject: Gravitational field
subject: Residual
subject: Satellite
subject: Eclipse
subject: Mathematics
subject: FOS: Mathematics
subject: Discrete wavelet transform
subject: Wavelet
subject: Remote sensing
subject: Radio spectrum
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: For further improvements of gravity field models based on Gravity Recovery and Climate Experiment (GRACE) observations, it is necessary to identify the error sources within the recovery process. Observation residuals obtained during the gravity field recovery contain most of the measurement and modeling errors and thus can be considered as a realization of actual errors. In this work, we investigate the ability of wavelets to help in identifying specific error sources in GRACE range rate residuals. The Multi-Resolution Analysis (MRA) using Discrete Wavelet Transform (DWT) is applied to decompose the residual signal into different scales with corresponding frequency bands. Temporal, spatial, and orbit-related features of each scale are then extracted for further investigations. The wavelet analysis has proved to be a practical tool to find the main error contributors. Beside the previously known sources such as K-Band Ranging (KBR) system noise and systematic attitude variations, this method clearly shows effects which the classic spectral analysis is hardly able or unable to represent. These effects include long-term signatures due to satellite eclipse crossings and dominant ocean tide errors.
Gravity wave turbulence revealed by horizontal vibrations of the container
Creators: name: Issenmann, Bruno
name: Falcon, Eric
Publisher: name: arXiv
Year: 2012
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Chaotic Dynamics (nlin.CD)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We experimentally study the role of the forcing on gravity-capillary wave turbulence. Previous laboratory experiments using spatially localized forcing (vibrating blades) have shown that the frequency power-law exponent of the gravity wave spectrum depends on the forcing parameters. By horizontally vibrating the whole container, we observe a spectrum exponent that does not depend on the forcing parameters for both gravity and capillary regimes. This spatially extended forcing leads to a gravity spectrum exponent in better agreement with the theory than by using a spatially localized forcing. The role of the vessel shape has been also studied. Finally, the wave spectrum is found to scale linearly with the injected power for both regimes whatever the forcing type used.
title: ОСОБЕННОСТИ ВЫРАЩИВАНИЯ ВИГНЫ (VIGNA) В УСЛОВИЯХ ЗОНЫ НЕУСТОЙЧИВОГО УВЛАЖНЕНИЯ
title: FEATURES OF CULTIVATION OF COWPEA (VIGNA) IN THE ZONE OF UNSTABLE HUMIDIFICATION
Creators: name: Ефремова, М.Е.
name: Дутов, В.Н.
name: Лобанкова, О. Ю.
Publisher: name: ФГБНУ "Северо-Кавказский федеральный научный аграрный центр"
Year: 2019

description: Вигну выращивают, как пищевую, кормовую и сидеральную  культуру. Ее посевы способ-ствуют повышению плодородия почвы. Вигна возделывается в регионах с повышенным температурным режимом и недостаточным увлажнением, где посевы фасоли сильно угне-таются, что имеет исключительную актуальность в условиях климатической зоны с не-устойчивым увлажнением Ставропольского края. В связи с этим актуальна задача уста-новления возможности и целесообразности интродукции данной сельскохозяйственной культуры с целью расширения ассортимента овощей, выращиваемых в южных регионах России.
description: Vigna is grown as a food, feed and green manure crop. Its crops contribute to increasing soil fertility. When cultivated in regions with high temperatures and lack of moisture where the crops of beans is strongly inhibited, which is particularly relevant in conditions of climatic zones with unstable moistening of the Stavropol territory. In this regard, the task of establishing the possi-bility and feasibility of the introduction of this crop in order to expand the range of vegetables grown in the southern regions of Russia is urgent.
On the photometric error calibration for the `differential light curves' of point-like Active Galactic Nuclei
Creators: name: Goyal, Arti
name: Mhaskey, Mukul
name: Gopal-Krishna
name: Wiita, Paul J.
name: Stalin, C. S.
name: Sagar, Ram
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: It is important to quantify the underestimation of rms photometric errors returned by the commonly used $\emph APPHOT$ algorithm in the $\emph IRAF$ software, in the context of differential photometry of point-like AGN, because of the crucial role it plays in evaluating their variability properties. Published values of the underestimation factor, $η$, using several different telescopes, lie in the range 1.3 - 1.75. The present study aims to revisit this question by employing an exceptionally large data set of 262 differential light curves (DLCs) derived from 262 pairs of non-varying stars monitored under our ARIES AGN monitoring program for characterizing the intra-night optical variability (INOV) of prominent AGN classes. The bulk of these data were taken with the 1-m Sampurnanad Telescope (ST). We find $η$ = 1.54$\pm$0.05 which is close to our recently reported value of $η$ = 1.5. Moreover, this consistency holds at least up to a brightness mismatch of 1.5 mag between the paired stars. From this we infer that a magnitude difference of at least up to 1.5 mag between a point-like AGN and comparison star(s) monitored simultaneously is within the same CCD chip acceptable, as it should not lead to spurious claims of INOV.
description: 20 pages, 3 figures and 1 table; accepted for publication in JApA
Interface characterization between polyethylene/silica in engineered cementitious composites by molecular dynamics simulation
Creators: name: Zhou, Shuai
name: Vu-Bac, Nam
name: Arash, Behrouz
name: Zhu, Hehua
name: Zhuang, Xiaoying
Publisher: name: Basel : MDPI AG
Year: 2019
Subjects: subject: Autogenous healing
subject: ECC
subject: Interface
subject: Self-healing concrete
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: Polyethylene is widely adopted in engineered cementitious composites to control the crack width. A clearer knowledge of the PE/concrete interfacial properties is important in developing engineered cementitious composites, which can lead to a limited crack width. Tensile failure and adhesion properties of the amorphous polyethylene/silica (PE/S) interface are investigated by molecular dynamics to interpret the PE/concrete interface. The influence of the PE chain length, the PE chain number and coupling agents applied on silica surface on the interfacial adhesion is studied. An increase of the adhesion strength of the modified silica surface by coupling agents compared with the unmodified silica is found. The failure process, density profile and potential energy evolutions of the PE/S interface are studied. The thermodynamic work of adhesion that quantifies the interfacial adhesion of the PE/S interface is evaluated. The present study helps to understand the interfacial adhesion behavior between ECC and PE, and is expected to contribute to restricting the crack width.
Direct Measurement of the Free Energy of Aging Hard-Sphere Colloidal Glasses
Creators: name: Zargar, Rojman
name: Nienhuis, Bernard
name: Schall, Peter
name: Bonn, Daniel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The nature of the glass transition is one of the most important unsolved problems in condensed matter physics. The difference between glasses and liquids is believed to be caused by very large free energy barriers for particle rearrangements; however so far it has not been possible to confirm this experimentally. We provide the first quantitative determination of the free energy for an aging hard-sphere colloidal glass. The determination of the free energy allows for a number of new insights in the glass transition, notably the quantification of the strong spatial and temporal heterogeneity in the free energy. A study of the local minima of the free energy reveals that the observed variations are directly related to the rearrangements of the particles. Our main finding is that the probability of particle rearrangements shows a power law dependence on the free energy changes associated with the rearrangements, similarly to the Gutenberg-Richter law in seismology.
description: 4 pages, 4 figures
Fatigue tests of axially loaded butt welds up to very high cycles
Creators: name: Schaumann, Peter
name: Steppeler, S.
Publisher: name: Amsterdam : Elsevier
Year: 2013
Subjects: subject: SN-curves
subject: Steel
subject: Stress ratio
subject: Test frequency
subject: Very high cylce fatigue
subject: Welded joints
subject: Konferenzschrift
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik

description: Fatigue strength curves that are established from fatigue tests provide a basis for the fatigue assessment applying nominal stress approach. In the codes valid for steel structures, like the EC 3, the fatigue strength curves for constant amplitude loading have a knee point in the transition region. The fatigue strength curve beyond this knee point is commonly assumed to be a horizontal asymptote. However, the behaviour of the fatigue strength curve in the area of very high cycles and more importantly the existence of an endurance limit are much discussed. In the case of welded joints the experimental data beyond 107 load cycles is limited due to the possibilities in testing. Testing techniques with high frequencies are necessary to obtain experimental data with very high cycles in a reasonable period of time. In this scope a testing device with approximately 390 Hz operates by alternating current magnets and using resonance amplification, which was developed by a third party. This testing device was investigated and advanced for the application of long term tests reaching 5·108 load cycles. Fatigue tests on axially loaded butt welds with constant amplitude loading are conducted in three test series until very high cycles. The fatigue tests include the area of high and very high cycles. The influence of test frequency and stress ratio is investigated.
Neural networks for the generation of sea bed models using airborne lidar bathymetry data
Creators: name: Kogut, Tomasz
name: Niemeyer, Joachim
name: Bujakiewicz, Aleksandra
Publisher: name: Abingdon : Taylor and Francis Ltd.
Year: 2016
Subjects: subject: Airborne lidar bathymetry
subject: Delaunay triangulation
subject: Interpolation
subject: Inverse distance weighting
subject: Neural networks
subject: 520

description: Various sectors of the economy such as transport and renewable energy have shown great interest in sea bed models. The required measurements are usually carried out by ship-based echo sounding, but this method is quite expensive. A relatively new alternative is data obtained by airborne lidar bathymetry. This study investigates the accuracy of these data, which was obtained in the context of the project ‘Investigation on the use of airborne laser bathymetry in hydrographic surveying’. A comparison to multi-beam echo sounding data shows only small differences in the depths values of the data sets. The IHO requirements of the total horizontal and vertical uncertainty for laser data are met. The second goal of this paper is to compare three spatial interpolation methods, namely Inverse Distance Weighting (IDW), Delaunay Triangulation (TIN), and supervised Artificial Neural Networks (ANN), for the generation of sea bed models. The focus of our investigation is on the amount of required sampling points. This is analyzed by manually reducing the data sets. We found that the three techniques have a similar performance almost independently of the amount of sampling data in our test area. However, ANN are more stable when using a very small subset of points.
The classifying topos of a group scheme and invariants of symmetric bundles
Creators: name: Cassou-Noguès, Philippe
name: Chinburg, Ted
name: Morin, Baptiste
name: Taylor, Martin J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 15A63, 14F20

description: Let $Y$ be a scheme in which 2 is invertible and let $V$ be a rank $n$ vector bundle on $Y$ endowed with a non-degenerate symmetric bilinear form $q$. The orthogonal group ${\bf O}(q)$ of the form $q$ is a group scheme over $Y$ whose cohomology ring $H^*(B_{{\bf O}(q)},{\bf Z}/2{\bf Z})\simeq A_Y[HW_1(q),..., HW_n(q)]$ is a polynomial algebra over the étale cohomology ring $A_Y:=H^*(Y_{et},{\bf Z}/2{\bf Z})$ of the scheme $Y$. Here the $HW_i(q)$'s are Jardine's universal Hasse-Witt invariants and $B_{{\bf O}(q)}$ is the classifying topos of ${\bf O}(q)$ as defined by Grothendieck and Giraud. The cohomology ring $H^*(B_{{\bf O}(q)},{\bf Z}/2{\bf Z})$ contains canonical classes $\mathrm{det}[q]$ and $[C_q]$ of degree 1 and 2 respectively, which are obtained from the determinant map and the Clifford group of $q$. The classical Hasse-Witt invariants $w_i(q)$ live in the ring $A_Y$. Our main theorem provides a computation of ${det}[q]$ and $[C_{q}]$ as polynomials in $HW_{1}(q)$ and $HW_{2}(q)$ with coefficients in $A_Y$ written in terms of $w_1(q),w_2(q)\in A_Y$. This result is the source of numerous standard comparison formulas for classical Hasses-Witt invariants of quadratic forms. Our proof is based on computations with (abelian and non-abelian) Cech cocycles in the topos $B_{{\bf O}(q)}$. This requires a general study of the cohomology of the classifying topos of a group scheme, which we carry out in the first part of this paper.
description: 63 pages
Experimental and numerical analysis of air trapping in a porous medium with coarse textured inclusions
Creators: name: Szymańska, Paulina
name: Tisler, Witold
name: Schütz, Cindi
name: Szymkiewicz, Adam
name: Neuweiler, Insa
name: Helmig, Rainer
Publisher: name: Warsaw : De Gruyter Open Ltd
Year: 2016
Subjects: subject: airtrapping
subject: heterogeneous soils
subject: Richards equation
subject: vadose zone
subject: Infiltration
subject: Porous materials
subject: Solute transport
subject: Experimental and numerical analysis
subject: Heterogeneous materials
subject: Heterogeneous soils
subject: Material heterogeneity
subject: Richards Equation
subject: Two phase flow model
subject: Vadose Zone
subject: Two phase flow
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: The paper presents a 2D upward infiltration experiment performed on a model porous medium consisting of fine sand background with two inclusions made of coarser sands. The purpose of the experiment was to investigate the effects of structural air trapping, which occurs during infiltration as a result of heterogeneous material structure. The experiment shows that a significant amount of air becomes trapped in each of the inclusions. Numerical simulations were carried out using the two-phase water-air flow model and the Richards equation. The experimental results can be reproduced with good accuracy only using a two-phase flow model, which accounts for both structural and pore-scale trapping. On the other hand, the Richards equation was not able to represent the structural trapping caused by material heterogeneity.
Period -- mass-loss rate relation of Miras with and without technetium
Creators: name: Uttenthaler, Stefan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Aims: We report the discovery that Mira variables with and without absorption lines of the element technetium (Tc) occupy two different regions in a diagram of near- to mid-infrared colour versus pulsation period. Tc is an indicator of a recent or ongoing mixing event called the third dredge-up (3DUP), and the near- to mid-IR colour, such as the (K-[22]) colour where [22] is the the 22 micron band of the WISE space observatory, is an indicator of the dust mass-loss rate of a star. Methods: We collected data from the literature about the Tc content, pulsation period, and near- and mid-infrared magnitudes of more than 190 variable stars on the asymptotic giant branch (AGB) to which Miras belong. The sample is naturally biased towards optical AGB stars, which have low to intermediate (dust) mass-loss rates. Results: We show that a clear relation between dust mass-loss rate and pulsation period exists if a distinction is made between Tc-poor and Tc-rich Miras. Surprisingly, at a given period, Tc-poor Miras are redder in (K-[22]) than are Tc-rich Miras; i.e. they have higher mass-loss rates than the Tc-rich Miras. A few stars deviate from this trend; physical explanations are given for these exceptions, such as binarity or high mass. Conclusions: We put forward two hypotheses to explain this dichotomy and conclude that the two sequences formed by Tc-poor and Tc-rich Miras are probably due to the different masses of the two groups. The pulsation period has a strong correlation with the dust-mass loss rate, indicating that the pulsations are indeed triggering a dust-driven wind. The location in the (K-[22]) vs. period diagram can be used to distinguish between pre- and post-3DUP Miras, which we apply to a sample of Galactic bulge AGB stars. We find that 3DUP is probably not common in AGB stars in the inner bulge.
description: Accepted for publication in A&A (5 pages, 2 figures, 1 on-line table); final version (language corrected)
Group Affective Tone and Team Performance: A Week-Level Study in Project Teams
Creators: name: Paulsen, Hilko
name: Klonek, Florian E.
name: Schneider, Kurt
name: Kauffeld, Simone
Publisher: name: Lausanne : Frontiers Media S.A.
Year: 2016
Subjects: subject: Feeling
subject: Team composition
subject: Distress
subject: Psychology
subject: FOS: Psychology
subject: Group affective tone
subject: Hostility
subject: Affect (psychology)
subject: Anxiety
subject: Social psychology
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::380 | Handel, Kommunikation, Verkehr

description: Group affective tone is an emergent state that can be shared by group members during interdependent tasks. Groups can experience positive group affective tone (PGAT), a shared feeling of e.g., excitement, enthusiasm, or activation as well as negative group affective tone (NGAT), a shared feeling of e.g., distress, anxiety, and hostility. So far, previous cross-sectional research suggests that PGAT and NGAT are related to team performance outcomes. However, little is known about how the dynamic and fluctuating group affective states are related to team performance over an extended period of time. Therefore, the current study investigated the relation between PGAT, NGAT, and performance over the course of 34 software engineering projects. We hypothesized that PGAT is positively related to team performance, whereas NGAT is negatively related to team performance. Based on the punctuated equilibrium model and the feeling-as-information-theory we expected that these associations become stronger in the second half of the project. Using week level design with 165 participants in 34 software engineering teams, we repeatedly assessed PGAT, NGAT, and team performance over 14 weeks. Data were analyzed using multilevel structural equation modeling. As expected, PGAT was positively related to team performance, whereas NGAT was negatively related to team performance – between teams over the course of the projects as well as within teams over time. More importantly, the weekly relationships were stronger in the second half of the project. Our study indicates that weekly variations in group affective tone are more relevant after projects reach a temporal midpoint. We discuss theoretical and practical implications for project teams.
Dynamical Evidence for a Magnetocentrifugal Wind from a 20 Msun Binary Young Stellar Object
Creators: name: Greenhill, L. J.
name: Goddi, C.
name: Chandler, C. J.
name: Matthews, L. D.
name: Humphreys, E. M. L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In Orion BN/KL, proper motions of 7 mm vibrationally-excited SiO masers trace rotation of a nearly edge-on disk and a bipolar wide-angle outflow 10-100 AU from radio Source I, a binary young stellar object (YSO) of ~20 Msun. Here we map ground-state 7 mm SiO emission with the Very Large Array and track proper motions over 9 years. The innermost and strongest emission lies in two extended arcs bracketing Source I. The proper motions trace a northeast-southwest bipolar outflow 100-1000 AU from Source I with a median 3D motion of ~18 km/s. An overlying distribution of 1.3 cm H2O masers betrays similar flow characteristics. Gas dynamics and emission morphology traced by the masers suggest the presence of a magnetocentrifugal disk-wind. Reinforcing evidence lies in the colinearity of the flow, apparent rotation across the flow parallel to the disk rotation, and recollimation that narrows the flow opening angle ~120 AU downstream. The arcs of ground-state SiO emission may mark the transition point to a shocked super-Alfvenic outflow.
description: 7 pages, 4 figures, and 1 table. Accepted for publication in ApJ Letters
Detecting swift heavy ion irradiation effects with graphene
Creators: name: Ochedowski, O.
name: Akcöltekin, S.
name: d`Etat, B. Ban
name: Lebius, H.
name: Schleberger, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this paper we show how single layer graphene can be utilized to study swift heavy ion (SHI) modifications on various substrates. The samples were prepared by mechanical exfoliation of bulk graphite onto SrTiO$_3$, NaCl and Si(111), respectively. SHI irradiations were performed under glancing angles of incidence and the samples were analysed by means of atomic force microscopy in ambient conditions. We show that graphene can be used to check whether the irradiation was successful or not, to determine the nominal ion fluence and to locally mark SHI impacts. In case of samples prepared in situ, graphene is shown to be able to catch material which would otherwise escape from the surface.
description: 10 pages, 3 figures
Novel grid concepts for urban area power supply
Creators: name: Stemmle, M.
name: Merschel, F.
name: Noe, M.
name: Hofmann, L.
name: Hobl, A.
Publisher: name: Amsterdam : Elsevier
Year: 2012
Subjects: subject: HTS cables
subject: Inner city power supply
subject: Medium voltage superconductor cables
subject: Superconducting fault current limiters
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: This paper presents results of a study investigating a permanent grid deployment of medium voltage superconductor cables in combination with superconducting fault current limiters within a typical urban area power system. A completely new grid concept, which only becomes feasible through the use of superconductor cable systems, is shown. Further, several different cable options, including superconducting and conventional cables, are compared.
Aphanes arvensis L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: C. arvensis L. Cat. 260. Var. villosus Lej. - 2:Branson-Fully-Saillon (Gams); Ayent (P.); Lens (Beauverd). - 4:Binn (P.).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
title: The 2018 Longline Survey of the Gulf of Alaska and Eastern Aleutian Islands on the FV Alaskan Leader: Cruise Report AL-18-01
Creators: name:  Malecha, Patrick William
name: Rodgveller, Cara J.
name: Lunsford, Chris R.
name: Siwicke, Kevin A.
Publisher: name: United States. National Marine Fisheries Service.  Alaska Fisheries Science Center (U.S.).  Auke Bay Laboratories (Juneau, Alaska)
Year: 2019

description: AFSC processed report ; 2019-02
Enhancement of photon intensity in forced coupled quantum wells inside a semiconductor microcavity
Creators: name: Eleuch, Hichem
name: Prasad, Awadhesh
name: Rotter, Ingrid
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study numerically the photon emission from a semiconductor microcavity containing $N\ge 2$ quantum wells under the influence of a periodic external forcing. The emission is determined by the interplay between external forcing and internal interaction between the wells. While the external forcing synchronizes the periodic motion, the internal interaction destroys it. The nonlinear term of the Hamiltonian supports the synchronization. The numerical results show a jump of the photon intensity to very large values at a certain critical value of the external forcing when the number of quantum wells is not too large. We discuss the dynamics of the system across this transition.
description: To be appeared in Phys. Rev. E
title: Industrie und Arbeit 4.0
title: Befunde zu Digitalisierung und Mitbestimmung im Industriesektor auf Grundlage des Projekts „Arbeit 2020“
titleType: AlternativeTitle
Creators: name: Bosch, Gerhard
name: Bromberg, Tabea
name: Haipeter, Thomas
name: Schmitz, Jutta
Publisher: name: DuEPublico: Duisburg-Essen Publications Online, University of Duisburg-Essen, Germany
Year: 2018

description: Auf den Punkt ...
Das IAQ untersucht im Rahmen eines von der Hans-Böckler-Stiftung finanzierten Forschungsprojekts den Stand der Umsetzung
von Industrie 4.0 in den Betrieben sowie die arbeitspolitischen Folgen und die Herausforderungen, die mit der Digitalisierung für die Mitbestimmung der Betriebsräte einhergehen. Grundlage dafür ist das von der IG Metall initiierten gewerkschaftlichen Projekts „Arbeit 2020 in NRW“, das vom IAQ wissenschaftlich begleitet wird.
Gemessen an dem Leitbild von Industrie 4.0 stecken die hier betrachteten Fallbetriebe gegenwärtig noch in den Anfängen. Auch neue Geschäftsmodelle sind gegenwärtig eher Vision als systematisch ausgearbeitete Geschäftsstrategien. Die Digitalisierung in den Angestelltenbereichen ist deutlich weiter entwickelt als die Digitalisierung der Produktion.
Die Beratungsprozesse des Arbeit 2020-Projektes wirken zumeist aktivierend auf die Betriebsräte und ihre Gremien. Sie sind zudem beteiligungsorientiert gestaltet und können Anstoß für breitere Beteiligungsprojekte der Betriebsräte sein.
Im Zentrum der arbeitspolitischen Themen der Betriebsräte steht die Beschäftigungssicherung. Wichtige weitere Themen sind Qualifizierungs- und Organisationsfragen sowie die Entwicklung der Arbeitsbedingungen.
title: ФОТОСИНТЕТИЧЕСКАЯ ДЕЯТЕЛЬНОСТЬ ПОСЕВОВ МНОГОЛЕТНИХ ПОЛЕВЫХ КУЛЬТУР И ИХ ВЛИЯНИЕ НА КОЛИЧЕСТВО СОРНЯКОВ
title: PHOTOSYNTHETIC ACTIVITY OF CROPS PERENNIAL FIELD CROPS AND THEIR INFLUENCE ON THE AMOUNT OF WEEDS
Creators: name: Исаев, К.В.
name: Щебарскова, З.С.
Publisher: name: ФГБНУ "Северо-Кавказский федеральный научный аграрный центр"
Year: 2019

description: Астраханская область имеет богатейший ресурс пастбищных земель, которые пригодны для круглогодичного использования различными видами животных. Пастбища являются достаточно уникальной территорией области, так как позволяют содержать животных по-чти круглогодично на пастбищах, число не выпасных дней – 30 - 40. По своему видовому составу, сезонности накопления поедаемой  массы, пригодности для стравливания астра-ханские пастбища лучше всего соответствуют содержанию овец, верблюдов и лошадей.  При  разумном сочетании и рациональном использовании пастбищ можно добиться не ис-тощаемого их использования при условии орошения, и подсева люцерны, и многолетних злаковых трав. Урожайность  сухой массы  за вегетационный период  составляет  от 1,8 до 2,8 т/га.
description: Astrakhan region has a rich resource of pasture lands, which are suitable for year-round use by various species of animals. Pastures are rather unique territory of the region, as they allow keep-ing animals almost all year round on pastures, the number of non-grazing days is 30 - 40. By its specific composition, seasonality of accumulation of the eaten mass, suitability for grazing As-trakhan pastures best correspond to the content of sheep, camels and horses.  With a reasonable combination and rational use of pastures, it is possible to achieve non-exhaustible use of them under the condition of irrigation, and sowing of alfalfa, and perennial grasses. The yield of dry mass during the growing season ranges from 1.8 to 2.8 t/ha.
On Noise Analysis of Oscillators Based on Statistical Mechanics
Creators: name: Thiessen, Tina
name: Mathis, Wolfgang
Publisher: name: Berlin : Walter de Gruyter
Year: 2010
Subjects: subject: Nonlinear oscillators
subject: thermal noise
subject: statistical mechanics
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik

description: In this paper a new approach of thermal noise analysis of electronic oscillators is presented. Although nonlinear electronic oscillators are one of the most essential subcircuits in electronic systems typical design concepts for these oscillators are based on ideas of linear circuits. Because the functionality of oscillators depends on nonlinearities, advanced design methods are developed where nonlinearities are an integral part. Since low voltage oscillator concepts have to be developed in modern IC technologies there is a need to include at least thermal noise aspects into the design flow. For this reason we developed new physical descriptions of thermal noise in electronic oscillators where we use ideas from nonequilibrium statistical mechanics as well as the Langevin approach. We illustrate our concepts by some examples.
Columbia College, Class of 1927 Tenth Year Reunion. New York
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2020
Subjects: Class reunions

description: Film made by Eric Bernt and John Maurer for W. French Githens (C '27); claims to be first privately produced sound motion picture. Original Film Restricted. User must view Video Cassette copy. Three VHS transfer copies in Box 25.)
MAKTABGACHA TA'LIM TASHKILOTLARIDA BOLALARDA ELEMENTAR MATEMATIK TASAVVURLARNI RIVOJLANTIRISHDA TANGRAM USULIDAN FOYDALANISH
Creators: name: Saidova, N.O.
name: Axmedova, T.S.
Publisher: name: Zenodo
Year: 2023

description: Bugungi rivojlanib borayotgan zamonda mamlakatimizda milliy genofondni mustahkamlash, o'sib borayotgan yosh avlodni yetuk kadrlar etib tarbiyalash masalalariga doimiy ravishda e'tibor qaratib kelinmoqda.
Die Belastung von Wasser und Boden in der mittelalterlichen Stadt - Einzelfall oder Paradigma?
Creators: name: Röber, Ralph
Publisher: name: Mitteilungen der Deutschen Gesellschaft für Archäologie des Mittelalters und der Neuzeit
Year: 2016

description: [nicht vorhanden / not available]
description: Mitteilungen der Deutschen Gesellschaft für Archäologie des Mittelalters und der Neuzeit, Bd. 29 (2016): Mitteilungen der DGAMN: Ressourcen
Ressourcennutzung als soziale Praxis auf der Ostseeinsel Gotland
Creators: name: Widmaier, Jörg
name: Dieckmann, Janina
Publisher: name: Mitteilungen der Deutschen Gesellschaft für Archäologie des Mittelalters und der Neuzeit
Year: 2016

description: [nicht vorhanden / not available]
description: Mitteilungen der Deutschen Gesellschaft für Archäologie des Mittelalters und der Neuzeit, Bd. 29 (2016): Mitteilungen der DGAMN: Ressourcen
Low Temperature Optodic Bonding for Integration of Micro Optoelectronic Components in Polymer Optronic Systems
Creators: name: Wang, Y.
name: Overmeyer, Ludger
Publisher: name: Amsterdam : Elsevier
Year: 2014
Subjects: subject: Flip-chip
subject: die bonding
subject: UV-curing adhesives
subject: optoelectronic
subject: component integration
subject: low-temperature
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik

description: Large area, planar optronic systems based on flexible polymer substrates allow a reel-to-reel mass production, which is widely adopted in modern manufacturing. Polymer optronic systems are fully integrated with micro optical and optoelectronic components as light sources, detectors and sensors to establish highly functional sensor networks. To achieve economical production, low-cost polymer sheets are employed. Since they are mostly thermally sensitive, this requires a restricted thermal loading during processing. Furthermore, a short process time improves production efficiency, which plays a key role in manufacturing processes. Thus, in this contribution we introduce a new bare chip bonding technique using light instead of heat to meet both requirements. The technique is based on the conventional flip-chip die bonding process. Ultraviolet radiation curing adhesives are applied as bonding material, accordingly a sideway ultraviolet radiation source, a so-called optode, is designed. Before implementing the concept, the light distribution in the contact spot is simulated to examine the feasibility of the solution. Besides, we investigate two different UV lamps regarding induced thermal influence on polymer substrate to choose one to be employed in the optode. Process factors, irradiation intensity and irradiation time are studied. Based on these results, the mechanical and electrical reliability of the integrated components is finally evaluated.
Early assessment of defects and damage in jet engines
Creators: name: Adamczuk, Rafael R.
name: Seume, Jörg R.
Publisher: name: Amsterdam : Elsevier
Year: 2013
Subjects: subject: BOS
subject: CFD
subject: Hot gas path
subject: Jet engine
subject: Maintenance
subject: Artificial defects
subject: Background oriented schlieren methods
subject: Density distributions
subject: Engine maintenance
subject: Hot-gas path
subject: Turbine blade tip clearances
subject: Two-stage axial turbines
subject: Computational fluid dynamics
subject: Damage detection
subject: Defect density
subject: Jet engines
subject: Turbines
subject: Defects
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: The jet engine maintenance process is complex, expensive and time-consuming. It often requires engine disassembly or boroscopic examinations. In order to accelerate the process and reduce the down time of an engine we intend to develop a method to locate and characterize defects and damage at an early state, without having to disassemble the engine. The assumption is that various defects in the hot gas path of an engine have a noticeable impact on the spatial density distribution of the exhaust jet of an engine. The resulting differences in the exhaust jet pattern will be measured with the Background Oriented Schlieren method (BOS). We perform numerical simulations (CFD) in order to analyze the effects of various general defect types on the density pattern of the exhaust jet. The defects under investigation include the malfunction of one burner, the increase the turbine blade tip clearance and burned trailing edges of the blades. The changes in the pattern resulting from the defects are compared to the density distribution of the undamaged initial state. It is shown that different exhaust jet patterns can be linked to the investigated hot gas path defects. Furthermore, a BOS set-up is installed in a test cell of a helicopter engine with a twostage axial turbine to demonstrate the applicability of the BOS method for the measurement of small density gradients resulting from temperature non-uniformities. A cold streak was inserted into the exhaust diffuser to simulate an artificial defect. The completed measurements show that the BOS method is able to detect these small variations. The present paper summarizes the results of different investigations. It presents a combination of BOS measurements of the exhaust jet and CFD simulations of defects within the hot gas path as a promising approach for evaluating the condition of a jet engine.
title: ГУМИНОВЫЕ ПРЕПАРАТЫ В ТЕХНОЛОГИИ ВОЗДЕЛЫВАНИЯ ГРЕЧИХИ
title: HUMIC MEDICINES IN TECHNOLOGY OF CULTIVATION OF THE BUCKWHEAT
Creators: name: Корзун, О.С.
Publisher: name: ФГБНУ "Северо-Кавказский федеральный научный аграрный центр"
Year: 2019

description: В течение 2015, 2017 и 2018 гг. в почвенно-климатических условиях Гродненской обла-сти исследована урожайность гречихи тетраплоидного сорта Александрина в зависимости от некорневого внесения гуминовых препаратов. Установлено, что в среднем за три года при обработке посевов гречихи гуминовым препаратом Гуморост получена наибольшая прибавка урожайности по сравнению с  контрольным вариантом (14,3%).
description: During 2015, 2017 and 2018 years in soil climatic conditions of the Grodno region investigat-ed productivity of a buckwheat tetraploid grade Alexandrina depending on not root introduction of humic medicines. It is established that on average in three years when processing a buck-wheat crops the humic medicine Gumorost got the greatest rise of productivity in comparison with control option (14,3%).
Innovative drive concept for machining robots
Creators: name: Denkena, Berend
name: Litwinski, K.
name: Schönherr, M.
Publisher: name: Amsterdam : Elsevier
Year: 2013
Subjects: subject: Drive chain
subject: Machining
subject: Robotics
subject: Control loop
subject: Harmonic drive
subject: High resolution
subject: Machining capabilities
subject: Machining robot
subject: Model-based control
subject: Positioning tasks
subject: Algorithms
subject: Design
subject: Dynamic loads
subject: Equipment testing
subject: Errors
subject: Linear motors
subject: Manufacture
subject: Torque motors
subject: Servomotors
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: In this paper an innovative drive concept for robots to improve their machining capability is presented. As a test bed a two-axis robot is designed and equipped with torque motors with load-sided high resolution encoders in addition to conventional gear motors with harmonic drive gearboxes. The gear motors are used for positioning tasks while the torque motors in particular compensate static and dynamic load-sided angle errors. The model-based control algorithm is decoupled and separately actuates both the servo gear and torque motors. It is shown that a considerable increase of performance is possible when adding the torque motors especially regarding the compensation of dynamic angle errors. The paper will present the design and details of the new drive concept, the modeling basics and first simulation results.
Großbaustelle Karlsgraben. Eine Chaîne opératoire für den Umgang mit der Ressource Holz in der Karolingerzeit
Creators: name: Werther, Lukas
Publisher: name: Mitteilungen der Deutschen Gesellschaft für Archäologie des Mittelalters und der Neuzeit
Year: 2016

description: [nicht vorhanden / not available]
description: Mitteilungen der Deutschen Gesellschaft für Archäologie des Mittelalters und der Neuzeit, Bd. 29 (2016): Mitteilungen der DGAMN: Ressourcen