cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Model and control of tendon actuated robots
Creators: name: Palli, Gianluca <1977>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2007
Subjects: ING-INF/04 Automatica

description: The use of tendons for the transmission of the forces and the movements in robotic devices
has been investigated from several researchers all over the world. The interest in
this kind of actuation modality is based on the possibility of optimizing the position of
the actuators with respect to the moving part of the robot, in the reduced weight, high reliability,
simplicity in the mechanic design and, finally, in the reduced cost of the resulting
kinematic chain.
After a brief discussion about the benefits that the use of tendons can introduce in
the motion control of a robotic device, the design and control aspects of the UB Hand 3
anthropomorphic robotic hand are presented. In particular, the tendon-sheaths transmission
system adopted in the UB Hand 3 is analyzed and the problem of force control and
friction compensation is taken into account.
The implementation of a tendon based antagonistic actuated robotic arm is then investigated.
With this kind of actuation modality, and by using transmission elements with
nonlinear force/compression characteristic, it is possible to achieve simultaneous stiffness
and position control, improving in this way the safety of the device during the operation
in unknown environments and in the case of interaction with other robots or with humans.
The problem of modeling and control of this type of robotic devices is then considered
and the stability analysis of proposed controller is reported.
At the end, some tools for the realtime simulation of dynamic systems are presented.
This realtime simulation environment has been developed with the aim of improving the
reliability of the realtime control applications both for rapid prototyping of controllers
and as teaching tools for the automatic control courses.
The war in Vietnam as an atrocity producing conflict : an examination of actors and actions
Creators: name: Newton, Stephen Joseph
Publisher: name: University of British Columbia
Year: 2010

description: This thesis seeks to explain the commission of atrocities of war in Vietnam. The paper begins with a brief review of the nature of the war and the legal verification of atrocities in Vietnam. The thesis advanced by this paper is that the atrocities committed in Vietnam were a direct result of the technologies developed for and employed by the belligerents to the conflict; and, the psychological conditioning to which members of the warring sides were exposed both prior to and during the conflict. The paper further suggests that these two elements contributed to the atrocity-producing situation in Vietnam by means of an "action-reaction" process. This process is discussed throughout the paper in terms of the elements themselves, and the styles of warfare adopted by the warring sides. The paper's conclusion is that while the atrocities were not the direct result of deliberate attempts to perpetrate atrocities, they were the result the way in which the belligerents prepared for that war and the way in which they executed their respective strategies in response to actions undertaken by the other.
Solitary electromagnetic waves propagation in the asymmetric oppositely-directed coupler
Creators: name: Kazantseva, Elena V.
name: Maimistov, Andrei I.
name: Ozhenko, Sergei S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We consider the electromagnetic waves propagating in the system of coupled waveguides. One of the system components is a standard waveguide fabricated from nonlinear medium having positive refraction and another component is a waveguide produced from an artificial material having negative refraction. The metamaterial constituting the second waveguide has linear characteristics and a wave propagating in the waveguide of this type propagates in the direction opposite to direction of energy flux. It is found that the coupled nonlinear solitary waves propagating both in the same direction are exist in this oppositely-directed coupler due to linear coupling between nonlinear positive refractive waveguide and linear negative refractive waveguide. The corresponding analytical solution is found and it is used for numerical simulation to illustrate that the results of the solitary wave collisions are sensible to the relative velocity of the colliding solitary waves.
description: 9 pages,5 figures
title: Geschlossenes System (Konjunkturzyklus)
Creators: name: Steindl, Josef
Year: 2017

description: Modellskizzen zu: geschlossenes System (Konjunkturzyklus), Budgetpolitik, Kalecki-Modell mit exogenen Einflüssen, variable Preise.
description: Manuskript, 3 Bögen, 6 beschriebene Seiten
Network of Recurrent events - A case study of Japan
Creators: name: Revathi, P. G.
name: Krishnamohan, T. R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: A recently proposed method of constructing seismic networks from 'record breaking events' from the earthquake catalog of California (Phy. Rev. E, 77 6,066104, 2008) was successfull in establishing causal features to seismicity and arrive at estimates for rupture length and its scaling with magnitude. The results of our implementation of this procedure on the earthquake catalog of Japan establishes the robustness of the procedure. Additionally, we find that the temporal distributions are able to detect heterogeneties in the seismicity of the region.
description: 13 pages, 6 figures, 1 table
On the uniqueness of D=11 interactions among a graviton, a massless gravitino and a three-form. II: Three-form and gravitini
Creators: name: Cioroianu, E. M.
name: Diaconu, E.
name: Sararu, S. C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The interactions that can be introduced between a massless Rarita-Schwinger field and an Abelian three-form gauge field in eleven spacetime dimensions are analyzed in the context of the deformation of the free solution of the master equation combined with local BRST cohomology. Under the hypotheses of smoothness of the interactions in the coupling constant, locality, Poincare invariance, Lorentz covariance, and the presence of at most two derivatives in the Lagrangian of the interacting theory (the same number of derivatives like in the free Lagrangian), we prove that there are neither cross-couplings nor self-interactions for the gravitino in D=11.The only possible term that can be added to the deformed solution to the master equation is nothing but a generalized Chern-Simons term for the three-form gauge field, which brings contributions to the deformed Lagrangian, but does not modify the original, Abelian gauge transformations.
description: 20 pages
On the Dearth of Compact, Massive, Red Sequence Galaxies in the Local Universe
Creators: name: Taylor, Edward N
name: Franx, Marijn
name: Glazebrook, Karl
name: Brinchmann, Jarle
name: van der Wel, Arjen
name: van Dokkum, Pieter G
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Using data from the Sloan Digital Sky Survey (SDSS; data release 7), we have conducted a search for local analogs to the extremely compact, massive, quiescent galaxies that have been identified at z > 2. We show that incompleteness is a concern for such compact galaxies, particularly for low redshifts (z < ~0.05) as a result of the SDSS spectroscopic target selection algorithm. We have identified 63 massive red sequence galaxies at 0.066 < z < 0.12 that are smaller than the median size-mass relation by a factor of 2 or more. Consistent with expectations from the virial theorem, the median offset from the mass-velocity dispersion relation for these galaxies is 0.12 dex. We do not find any galaxies with sizes and masses comparable to those observed at z ~ 2, implying a decrease in the comoving number density (at fixed size and mass) by a factor of > 5000. This result cannot be explained by incompleteness: at 0.066 < z <0.12, the SDSS spectroscopic sample should typically be ~75% complete for galaxies with the sizes and masses seen at high redshift, although for the very smallest galaxies it may be as low as ~20%. To confirm that the absence of such compact massive galaxies in SDSS is not a spectroscopic selection effect, we have also looked for such galaxies in the SDSS photometric catalog, using photometric redshifts. While we do find signs of a bias against massive, compact galaxies, this analysis suggests that the SDSS spectroscopic sample is missing at most a few objects in the regime we consider. Accepting the high redshift results, it is clear that massive galaxies must undergo significant structural evolution over z<2 in order to match the population seen in the local universe. Our results suggest that a highly stochastic mechanism like major mergers cannot be the primary driver of this strong size evolution.
description: Submitted to ApJ: 18 pages in emulateapj format, 11 figures. Table of galaxy properties available on line from http://www.strw.leidenuniv.nl/~ent/
title: Trend and Cycle
Creators: name: Steindl, Josef
Year: 2017

description: Trend, cycle, cycle problems, long run changes, utilisation, measurement of technical progress, technology and economic structure, excess capacity in the long run, Kalecki.
description: Konvolut aus 4 maschinenschriftlichen Seiten mit handschrifltichen Anmerkungen sowie 5 handschriftlichen Seiten
Removal of chromium from water using manganese (II, III) oxides coated sand: adsorption and transformation of Cr(VI) and Cr(III)
Creators: name: Wu, Lisha
name: Khodadoust, Amid P.
name: Punia, Snover
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Marine Biology
subject: 60506 Virology

description: A manganese coated sand (MCS) sorbent containing manganese (II,III) oxides was developed for adsorption and transformation of chromium [Cr(VI) and Cr(III)] with potential application in flow-through permeable media adsorption filters. Characterization of the MCS sorbent using XRD and XPS showed that the oxides of manganese (II) and manganese (III) were present on the MCS sorbent surface. Adsorption of both Cr(VI) and Cr(III) onto the MCS sorbent occurred over a broad pH range from 3 to 10. Surface charge analysis of the MCS sorbent determined a pHPZC of 7.8, which may facilitate the uptake of both oxy-anionic Cr(VI) species and cationic Cr(III) species. Favorable adsorption of Cr(VI) and Cr(III) onto the MCS sorbent occurred according to the Langmuir and the Freundlich adsorption equations, with a higher adsorption capacity for Cr(III) than Cr(VI). Adsorption parameters from the Langmuir, the Freundlich and the Temkin adsorption equations showed a stronger binding of Cr(VI) than Cr(III). Adsorption of Cr(III) decreased with increasing calcium concentration while adsorption of Cr(VI) decreased with increasing concentration of common anions found in natural water in the following order: phosphate > sulfate> bicarbonate. Transformation of chromium occurred on the surface of the MCS sorbent due to the partial reduction of Cr(VI) and the partial oxidation of Cr(III), which may be attributed to the role of surface manganese (II,III) oxides as either reducing or oxidizing agents. The MCS sorbent is a recyclable and sustainable adsorbent for removal of chromium from water with an environmental impact comparable to ion-exchange technology.
Factorization of number into prime numbers viewed as decay of particle into elementary particles conserving energy
Creators: name: Sugamoto, Akio
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Number theory is considered, by proposing quantum mechanical models and string-like models at zero and finite temperatures, where the factorization of number into prime numbers is viewed as the decay of particle into elementary particles conserving energy. In these models, energy of a particle labeled by an integer $n$ is assumed or derived to being proportional to $\ln n$. The one-loop vacuum amplitudes, the free energies and the partition functions at finite temperature of the string-like models are estimated and compared with the zeta functions. The $SL(2, {\bf Z})$ modular symmetry, being manifest in the free energies is broken down to the additive symmetry of integers, ${\bf Z}_{+}$, after interactions are turned on. In the dynamical model existing behind the zeta function, prepared are the fields labeled by prime numbers. On the other hand the fields in our models are labeled, not by prime numbers but by integers. Nevertheless, we can understand whether a number is prime or not prime by the decay rate, namely by the corresponding particle can decay or can not decay through interactions conserving energy. Among the models proposed, the supersymmetric string-like model has the merit of that the zero point energies are cancelled and the energy levels may be stable against radiative corrections.
description: 16 pages, no figures
Asynchronous multiplicative coarse-space correction
Creators: name: Gbikpi-Benissan, Guillaume
name: Magoulès, Frédéric
Publisher: name: arXiv
Year: 2023
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: This paper introduces the multiplicative variant of the recently proposed asynchronous additive coarse-space correction method. Definition of an asynchronous extension of multiplicative correction is not straightforward, however, our analysis allows for usual asynchronous programming approaches. General asynchronous iterative models are explicitly devised both for shared or replicated coarse problems and for centralized or distributed ones. Convergence conditions are derived and shown to be satisfied for M-matrices, as also done for the additive case. Implementation aspects are discussed, which reveal the need for non-blocking synchronization for building the successive right-hand-side vectors of the coarse problem. Optionally, a parameter allows for applying each coarse solution a maximum number of times, which has an impact on the algorithm efficiency. Numerical results on a high-speed homogeneous cluster confirm the practical efficiency of the asynchronous two-level method over its synchronous counterpart, even when it is not the case for the underlying one-level methods.
Removal of Chromium from Water using Manganese (II, III) Oxides Coated Sand: Adsorption and Transformation of Cr(VI) and Cr(III)
Creators: name: Wu, Lisha
name: Khodadoust, Amid P.
name: Punia, Snover
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Marine Biology
subject: 60506 Virology

description: A manganese coated sand (MCS) sorbent containing manganese (II,III) oxides was developed for adsorption and transformation of hexavalent chromium [Cr(VI)] and trivalent chromium [Cr(III)] with potential application in flow-through permeable media adsorption filters. Characterization of the MCS sorbent using XRD and XPS showed that the oxides of manganese (II) and manganese (III) were present on the MCS sorbent surface. Adsorption of both Cr(VI) and Cr(III) onto the MCS sorbent occurred over a broad pH range from 3 to 10. Surface charge analysis of the MCS sorbent determined a pHPZC of 7.8, which may facilitate the uptake of both oxy-anionic Cr(VI) species and cationic Cr(III) species. Favorable adsorption of Cr(VI) and Cr(III) onto the MCS sorbent occurred according to the Langmuir and the Freundlich adsorption equations, with a higher adsorption capacity for Cr(III) than Cr(VI). Adsorption parameters from the Langmuir, the Freundlich and the Temkin adsorption equations showed a stronger binding of Cr(VI) than Cr(III). Adsorption of Cr(III) decreased with increasing calcium concentration while adsorption of Cr(VI) decreased with increasing concentration of common anions found in natural water in the following order: phosphate > sulfate > bicarbonate. Transformation of chromium occurred on the surface of the MCS sorbent due to the partial reduction of Cr(VI) and the partial oxidation of Cr(III), which may be attributed to the role of surface manganese (II,III) oxides as either reducing or oxidizing agents. The MCS sorbent is a recyclable and sustainable adsorbent for removal of chromium from water with an environmental impact comparable to ion-exchange technology.
Persistence of Ising-like easy-axis spin correlations in the paramagnetic state of the spin-1 chain compound NiTe$_2$O$_5$
Creators: name: Baek, Seung-Ho
name: Lee, Jun Han
name: Oh, Yoon Seok
name: Choi, Kwang-Yong
name: Büchner, Bernd
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A $^{125}$Te nuclear magnetic resonance (NMR) study was carried out in the paramagnetic state of the recently discovered quasi-one-dimensional spin-1 chain compound NiTe$_2$O$_5$. We observed that the $^{125}$Te NMR spectrum splits into two in a magnetic field applied along the $c$ axis. Based on the strong temperature variation of the relative intensity ratio of the split lines, we infer that the line splitting arises from the two sublattice susceptibilities induced in opposite directions along the chains. In great support of this interpretation, a quantitative analysis of the spin-lattice relaxation rate $T_1^{-1}$ and the Knight shift data unravels dominant transverse spin fluctuations. We conclude that Ising-like uniaxial spin correlations persist up to surprisingly high temperatures compared to the exchange energy scales. Spin-charge coupling mechanism via a self-doping effect may be important.
description: 7 pages, 4 figures, published in PRB
Megavitrina Ruud, Menkhorst & Neubert, 2016, gen. nov.
Creators: name: Ruud, A. Bank
name: Menkhorst, Henk P. M. G
name: Neubert, Eike
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Stylommatophora
Vitrinidae
Megavitrina

description: Megavitrina gen. nov. (Figs 21-23) Type species. – Megavitrina imperatoria spec. nov. (by original designation). Diagnosis. – Shell big (maximum diameter> 13 mm), orthostyl, with a closed umbilicus because of a reflexed (thickened) columellar peristome, and with a lacking membranous margin. Especially characteristic for the genus is the presence of 2 to 3 prominent growth interruptions. Derivatio nominis. – Named after the large size of the two currently known species when compared to the Vitrinidae taxa living in continental Europe. Differentiation. – Taxa of Arabivitrina have a more dome-shaped, subglobose shell, and lack the characteristic prominent growth interruptions. Remarks. – It is well known that in some areas vitrinids occur with a relatively large shell, i.e, a shell with a maximum diameter above 11 mm. These areas are Macaronesia (Madeira, Canary Islands), Saudi Arabia, Yemen, and the eastern part of Africa. From a geographical point of view, the below discussed species of Lebanon and Turkey are most closely related to those of Saudi Arabia, i.e. Arabivitrina. Neubert (1998: 449) already discussed the new genus in the context of Arabivitrina, and stated that a separate genus should be introduced, but postponed it “until preserved specimens are available for anatomical research”. Unfortunately, no such material has become available in the meanwhile. Since shell morphology prohibits the assignment of libanica and imperatoria into Arabivitrina or any other genus, we decided to make a new genus name available, despite the lack of anatomical data. A marked feature of the new genus is the presence of 2 to 3 very marked growth interruptions; it can also be seen at the inside of the aperture as a radially arranged, whitish, callus. As far as we known, this is a unique feature in the Vitrinidae. The robustness of the growth interruptions can be compared with those seen in the genus Eopolita Pollonera, 1916 (family Oxychilidae).
description: Published as part of Ruud, A. Bank, Henk P. M. G Menkhorst & Eike Neubert, 2016, Descriptions of new and little-known land snail taxa from Turkey, and establishment of a new genus (Gastropoda, Pulmonata: Lauriidae, Enidae and Vitrinidae), pp. 5-30 in Basteria 80 (1) on pages 25-26, DOI: 10.5281/zenodo.439745
description: {"references": ["BANK, R. A. & NEUBERT, E., 1998. Notes on Buliminidae, 5. On the systematic position of Arabian Buliminidae (Gastropoda Pulmonata), with the description of a new genus. - Basteria 61 (4 / 6): 73 - 84."]}
Development of recoverable adsorbents for Cr(VI) ions by grafting of a dimethylamino group-containing monomer on polyethylene substrate and subsequent quaternization
Creators: name: Yamada, Kazunori
name: Kitao, Yoshinori
name: Asamoto, Hiromichi
name: Minamisawa, Hiroaki
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: Marine Biology
subject: Hematology

description: A polymeric adsorbent for removal of hexavalent chromium (Cr(VI)) ions was developed by the photografting of 2-(dimethylamino)ethyl methacrylate (DMAEMA) to a polyethylene (PE) mesh and subsequent quaternization with iodoalkanes of different alkyl chain lengths. The grafting of DMAEMA and subsequent quaternization were verified by the FT-IR and XPS measurements. The Cr(VI) ion adsorption capacity of the DMAEMA-grafted PE meshes had the maximum value at the grafted amount of 2.6 mmol/g in a 0.20 mM K2Cr2O7 solution at pH 3.0 and 30°C. The adsorption behaviour obeyed the pseudo-second order kinetic model and well expressed by Langmuir isotherm. These results suggest that the Cr(VI) ion adsorption occurs through the electrostatic interaction mainly between protonated dimethylamino groups and hydrochromate (HCrO4-) ions. The adsorption capacity of the quaternized PE-g-PDMAEMA meshes increased with an increase in the degree of quaternization and/or the alkyl chain length of the iodoalkanes used and the maximum adsorption ratio was obtained at the degree of quaternization of 54.2% for the iodoheptane-quaternized PE-g-PDMAEMA (PE-g-QC7PDMAEMA) mesh. This value was about 1.86 times higher than that of the PE-g-PDAMEMA mesh. Cr(VI) ions were successfully desorbed from the PE-g-PDMAEMA and PE-g-QC7PDMAEMA meshes in eluents such as NaOH, NaCl, and NH4Cl. In 0.50 M NaCl, 0.10 M NH4Cl, and 0.50 mM NaOH, the adsorption and desorption process was repeatedly performed without any considerable decrease and the desorption behaviour obeyed the pseudo-second order kinetic model. These results emphasise that the PE-g-PDMAEMA meshes and their quaternized products can be applied as an adsorbent for Cr(VI) ions.
Star product and interacting fields on $κ$-Minkowski space
Creators: name: Kowalski-Glikman, J.
name: Walkus, A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this note we extend the methods developed by Freidel et al. [arXiv:hep-th/0612170] to derive the form of $ϕ^4$ interaction term in the case of scalar field theory on $κ$-Minkowski space, defined in terms of star product. We present explicit expressions for the $κ$-Minkowski star product. Having obtained the the interaction term we use the resulting deformed conservation rules to investigate if they lead to any threshold anomaly, and we find that in the leading order they do not, as expected.
description: 7 pages
The Pulsation of Chi Cygni Imaged by Optical Interferometry; a Novel Technique to Derive Distance and Mass of Mira Stars
Creators: name: Lacour, S.
name: Thiébaut, E.
name: Perrin, G.
name: Meimon, S.
name: Haubois, X.
name: Pedretti, E.
name: Ridgway, S.
name: Monnier, J. D.
name: Berger, J. P.
name: Schuller, P. A.
name: Woodruff, H.
name: Poncelet, A.
name: Coroller, H. Le
name: Millan-Gabet, R.
name: Lacasse, M.
name: Traub, W.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present infrared interferometric imaging of the S-type Mira star Chi Cygni. The object was observed at four different epochs in 2005-2006 with the IOTA optical interferometer (H band). Images show up to 40% variation in the stellar diameter, as well as significant changes in the limb darkening and stellar inhomogeneities. Model fitting gave precise time-dependent values of the stellar diameter, and reveals presence and displacement of a warm molecular layer. The star radius, corrected for limb darkening, has a mean value of 12.1 mas and shows a 5.1mas amplitude pulsation. Minimum diameter was observed at phase 0.94+/-0.01. Maximum temperature was observed several days later at phase 1.02+/-0.02. We also show that combining the angular acceleration of the molecular layer with CO (Delta v = 3) radial velocity measurements yields a 5.9+/-1.5 mas parallax. The constant acceleration of the CO molecules -- during 80% of the pulsation cycle -- lead us to argument for a free-falling layer. The acceleration is compatible with a gravitational field produced by a 2.1(+1.5/-0.7) solar mass star. This last value is in agreement with fundamental mode pulsator models. We foresee increased development of techniques consisting in combining radial velocity with interferometric angular measurements, ultimately allowing total mapping of the speed, density, and position of the diverse species in pulsation driven atmospheres.
description: 36 pages, accepted in ApJ
Wavelength Conversion Efficiency Enhancement in Modal Phase Matched $χ^{(2)}$ Nonlinear Waveguides
Creators: name: Kang, Dongpeng
name: Zhang, Weiqi
name: Helmy, Amr S.
name: Yu, Siyuan
name: Tan, Liying
name: Ma, Jing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Modal phase matching (MPM) is a widely used phase matching technique in Al$_x$Ga$_{1-x}$As and other $χ^{(2)}$ nonlinear waveguides for efficient wavelength conversions. The use of a non-fundamental spatial mode compensates the material dispersion but also reduces the spatial overlap of the three interacting waves and therefore limits the conversion efficiency. In this work, we develop a technique to increase the nonlinear overlap by modifying the material nonlinearity, instead of the traditional method of optimizing the modal field profiles. This could eliminate the limiting factor of low spatial overlap inherent to MPM and significantly enhance the conversion efficiency. Among the design examples provided, this technique could increase the conversion efficiency by a factor of up to $\sim$290 in an Al$_x$Ga$_{1-x}$As waveguide. We further show that this technique is applicable to all $χ^{(2)}$ material systems that utilize MPM for wavelength conversion.
description: 10 pages, 5 figures
Synchronization in a System of Kuramoto Oscillators with Distributed Gaussian Noise
Creators: name: Campa, Alessandro
name: Gupta, Shamik
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider a system of globally-coupled phase-only oscillators with distributed intrinsic frequencies and evolving in presence of distributed Gaussian, white noise, namely, a Gaussian, white noise whose strength for every oscillator is a specified function of its intrinsic frequency. In the absence of noise, the model reduces to the celebrated Kuramoto model of spontaneous synchronization. For two specific forms of the mentioned functional dependence and for a symmetric and unimodal distribution of the intrinsic frequencies, we unveil the rich long-time behavior that the system exhibits, which stands in stark contrast to the case in which the noise strength is the same for all the oscillators. Namely, in the studied dynamics, the system may exist in either a synchronized or an incoherent or a time-periodic state; interestingly, all of these states also appear as long-time solutions of the Kuramoto dynamics for the case of bimodal frequency distributions, but in the absence of any noise in the dynamics.
description: 13 pages, 5 figures
Ligninolytic enzyme activity and removal efficiency of pharmaceuticals in a water matrix by fungus Rhizopus sp. Isolated from cassava
Creators: name: Kasonga, Teddy Kabeya
name: Kamika, Ilunga
name: Ngole-Jeme, Veronica M.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Plant Biology

description: Residual amounts of pharmaceutical compounds (PhCs) and by-products are continually released into surface water with effluents from conventional wastewater treatment plants (WWTPs). This study evaluated the ability of fungal isolate to remove selected PhCs [carbamazepine (CBZ), diclofenac (DCF) and ibuprofen (IBP)] from wastewater. The fungus used was Rhizopus sp. which was isolated from tuberous roots of cassava (Manihot esculenta). The isolate exhibited an important removal efficiency up to 100% and this was linked to ligninolytic enzymatic activity for lignin peroxidase (15.29 ± 2.69U/L) and manganese peroxidase (85.22 ± 4.26U/L), except laccase. This activity was optimum on day 9 of treatment. PhC metabolites were identified during the experiment revealing the existence of a biotransformation process catalysed by the isolated fungus. The disappearance of PhCs was attributed to their biosorption and biotransformation. However, it was not possible to establish a relationship between the ligninolytic enzymatic activity and the removal efficiency, which leads to the conclusion that there are other fungal metabolites which also play an important role in the biotransformation and biodegradation of the selected PhCs.
MPEC 2024-S150 : 2008 TE4
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
title: On the labour theory of value in Marx and in the Marxist tradition
Creators: name: Garegnani, Pierangelo
Year: 2017

description: Es handelt sich um die Kopie eines handschriftlich korrigierten und kommentierten 54-seitigen Typoskripts (je vier Seiten auf einem Blatt).
description: Typoskript, 14 Blätter, 54 Seiten
Multidentula reducta Ruud, Menkhorst & Neubert, 2016, spec. nov.
Creators: name: Ruud, A. Bank
name: Menkhorst, Henk P. M. G
name: Neubert, Eike
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Stylommatophora
Enidae
Multidentula
Multidentula reducta

description: Multidentula reducta spec. nov. (Fig. 19) Type locality & type specimens. – Turkey, Vilayet Sivas, Zara, 16 km towards Imranlı, 1400 m (39.8606°N 37.8765°E), H.P.M.G. Menkhorst leg., 15.vii.1988. Holotype NMBE 544681, paratypes NMBE 544682/1, HMK/12, RBA/1, RMNH/1. Diagnosis. – A middle-sized, oval Multidentula species with fine oblique striae, a missing suprapalatalis and a weakly developed or missing basalis, an oblique infrapalatalis, a non-fused subangularis, and a parietalis that is only slightly curved. Description. – Shell dextral, oval in outline, with a rather wide, open, slit-like umbilicus. The 6.0-7.2 whorls are convex with a rather deep suture. Teleoconch with irregular, sparse, oblique striae which are mostly rather fine; there are no spiral striae. Shell rather solid, slightly translucent, yellowish to horny yellowish, with a whitish band behind the peristome. The last whorl has no or only an indistinct impression and only the infrapalatalis is visible outside as a blurred white stripe. Peristome well reflected, thickened by a prominent labial callus, the columellar and palatal insertion connected by a clearly visible callus (but the callus is not extra thickened near the insertions). The subangularis is vertically pointing downwards, and is connected (but not fused) with the palatal peristome by a callus. The subangularis and parietalis are connected by a thin callus. Parietalis prominent, slightly curved and deeply recessed. A spiralis is missing. Columellaris ± oblique to the columellar peristome, deeply recessed. The basalis is absent, or present as an indistinct thickening only. Infrapalatalis well developed, oblique, and always stronger developed than the non-oblique palatalis superior. There is no suprapalatalis; a small suturalis is present. Measurements (n = 6). – H = 5.3-6.9 (mean 6.1); LWH = 3.2-3.8 (mean 3.5); MH = 2.1-2.4 (mean 2.2); LWD = 2.7-2.8 (mean 2.8); LWM = 2.7-3.0 (mean 2.8); MD = 1.7-1.9 (mean 1.8); NW = 6.0-7.2 (mean 6.6). Localities. – Known from the locus typicus only (see above). Derivatio nominis. – The name refers to the reduced apertural armature. Differentiation. – The armature of M. reducta is generally reduced: a basalis is absent or only weakly developed, a suprapalatalis is missing, and the parietalis is not as prominent and less curved as in M. squalina or M. pupoides. The palatal folds are, compared to M. squalina, also less deep in the aperture, but are placed closer to the peristome.
description: Published as part of Ruud, A. Bank, Henk P. M. G Menkhorst & Eike Neubert, 2016, Descriptions of new and little-known land snail taxa from Turkey, and establishment of a new genus (Gastropoda, Pulmonata: Lauriidae, Enidae and Vitrinidae), pp. 5-30 in Basteria 80 (1) on page 23, DOI: 10.5281/zenodo.439745
Temperature Dependence Of Cuprate Superconductors' Order Parameter
Creators: name: Mihlin, Alexander
name: Auerbach, Assa
Publisher: name: arXiv
Year: 2009
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A model of charged hole-pair bosons, with long range Coulomb interactions and very weak interlayer coupling, is used to calculate the order parameter -Phi- of underdoped cuprates. Model parameters are extracted from experimental superfluid densities and plasma frequencies. The temperature dependence -Phi(T)- is characterized by a 'trapezoidal' shape. At low temperatures, it declines slowly due to harmonic phase fluctuations which are suppressed by anisotropic plasma gaps. Above the single layer Berezinski-Kosterlitz-Thouless (BKT) temperature, Phi(T) falls rapidly toward the three dimensional transition temperature. The theoretical curves are compared to c-axis superfluid density data by H. Kitano et al., (J. Low Temp. Phys. 117, 1241 (1999)) and to the -transverse nodal velocity- measured by angular resolved photoemmission spectra on BSCCO samples by W.S. Lee et al., (Nature 450, 81 (2007)), and by A. Kanigel, et al., (Phys. Rev. Lett. 99, 157001 (2007)).
description: 9 pages, 5 figures
The nature of LS 5039 under the scrutiny of gamma-rays
Creators: name: Torres, Diego F.
name: Sierpowska-Bartosik, Agnieszka
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Several gamma-ray binaries have been recently detected by the High-Energy Stereoscopy Array (H.E.S.S.) and the Major Atmospheric Imaging Cerenkov (MAGIC) telescope. In two cases, their nature is unknown, since a final observational feature for a black hole or a pulsar compact object companion is still missing. One such system is LS 5039. Here we present results from a model (it includes a detailed account of the system geometry, the angular dependence of processes such as Klein-Nishina inverse Compton and gamma-gamma absorption, and a Monte Carlo simulation of cascading) of the high energy phenomenology of LS 5039 in which it is assumed that the companion object is a pulsar rotating around an O6.5V star in the 3.9 days orbit. We show that the H.E.S.S. phenomenology at all scales (spectra along the orbit in both broad and short phase-bins and lightcurve) is described within this model. We focus on presenting predictions for photons with lower energies (for E>1 GeV), subject to test in the forthcoming months with the GLAST satellite, and we also present predictions for future observations with high-energy arrays, such as H.E.S.S. II. Both set of predictions go beyond the description of the current data, and could provide a high-energy determination of the system's composition.
description: Contributed talk to the VII MQ Workshop, accepted for publication in the proceedings, PoS(MQW7)021
Per mantenere una cultura musicale dobbiamo insegnarla
Creators: name: Gossett, Philip
Publisher: name: Dipartimento delle Arti - Alma Mater Studiorum - Università di Bologna
Year: 2014

description: Come musicologi, abbiamo il dovere di fare di più per coniugare i nostri interessi con quelli degli studiosi impegnati in altri campi, fra cui la storia e la storia dell’arte. Il mio contributo al simposio intende delineare alcuni dei problemi che dobbiamo affrontare oggi nel contesto scolastico, insistendo sull’idea che noi, in quanto studiosi, possiamo fare molto per eradicare questi problemi. Occorre capire che la nostra disciplina va considerata parte integrante del bagaglio culturale che ogni studente deve possedere.
description: Musica Docta, 2014: Transmission of musical knowledge: Constructing a European citizenship
title: The dispersion of expectations in a speculative market
Creators: name: Steindl, Josef
Year: 2017
Subjects: subject: Spekulation Marktverhalten Erwartungsbildung Wahrscheinlichkeitsverteilung

description: The different expectations of participants in a market could be ordered in the form of a frequency distribution. [...] For the purpose of this representation we must assume that the expectations of different people are (approximately) independent of each other. The object of the expectation is the price after a certain time, or what is equivalent, the appreciation or depreciation within that time. (Auszug, S.1.)
description: Typoskript mit einigen Tippfehlern, 3 Blätter
First-principles design of nanomachines
Creators: name: Banavar, Jayanth R.
name: Cieplak, Marek
name: Hoang, Trinh Xuan
name: Maritan, Amos
Publisher: name: arXiv
Year: 2009
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Learning from nature's amazing molecular machines, globular proteins, we present a framework for the predictive design of nano-machines. We show that the crucial ingredients for a chain molecule to behave as a machine are its inherent anisotropy and the coupling between the local Frenet coordinate reference frames of nearby monomers. We demonstrate that, even in the absence of heterogeneity, protein-like behavior is obtained for a simple chain molecule made up of just thirty hard spheres. This chain spontaneously switches between two distinct geometries, a single helix and a dual helix, merely due to thermal fluctuations.
description: 6 pages, 4 figures, +supporting information, to appear in PNAS
title: Aspects of the theory of investment in the work of Kalecki and some of his followers
Creators: name: Bartoli, Gloria
Year: 2017
Subjects: subject: Kalecki, Michal <1899-1970> Investitionstheorie Preistheorie Unternehmenstheorie

description: It is well-known that, after repeated attempts at analysis, Kalecki considered the investment decision as the problem which remained to be properly resolved in the interpretation of capitalism. He had early rejected Keynes' emphasis on an independent role for banking policy and for conditions in financial markets (a subject which I will be treating in a separate essay), and instead he emphasised internal finance or cash-flow. This substaintial difference aside, Kalecki's work on investment subdivides into two strands: on the one hand the determinants of company profitability, and on the other the linkage between current profitability and investment decisions. The former concerns technical progress and manufactured pricing under imperfect competition. The latter provides the continuing theme in Kalecki's work, viz., the multiplier-accelerator or captal-stock adjustment mechanism: investment is associated with prospective profitability, prospective with current profitability, current profitability with pressure on capacity, and pressure on capacity with a lack of earlier investment. Various aspects of Kalecki's suggestions under both headings have been explored - here I consider Steindl, Sylos-Labini, and A. Wood. But these explorations do not achieve a satisfactory synthesis between Kalecki's two strands. (Auszug S.1)
description: Typoskript, gebunden, 35 Blätter, paginiert 1-33
La musica dei classici viennesi nella coscienza collettiva e agli occhi della ricerca: un’incomprensione vicendevole?
Creators: name: Schmid, Manfred Hermann
Publisher: name: Dipartimento delle Arti - Alma Mater Studiorum - Università di Bologna
Year: 2014

description: La cultura presuppone la comprensione storica. Non c’è insegnamento di grammatica, di religione o di musica senza tracce della storia. Tuttavia la storia, a dispetto della bella definizione di Leopold von Ranke, non ha alcunché d’oggettivo, e ancor meno ne hanno i suoi verdetti. La storia, si sa, è un costrutto intellettuale. All’edificazione di questo costrutto, nonché alla sua trasmissione – anche alla “trasmissione del sapere musicale”, il nostro tema – prendono parte istanze assai diverse, di certo non la sola ricerca storica.

Per la storia della musica dobbiamo fare i conti con tre diverse istanze:

(a) la corporazione dei musicisti, nel gergo della loro oralità;

(b) la comunità scientifica, nella sua produzione editoriale, nel suo magistero accademico;

(c) l’opinione pubblica, nel condizionamento derivante dai mass-media.

Tra (b) e (c) si pone inoltre la scuola. Essa deriva la propria autocoscienza dalla ricerca; molto più della comunità scientifica, tuttavia, è chiamata a confrontarsi con l’opinione pubblica.

Le visioni della storia differiscono tra loro, com’è lecito aspettarsi, e mutano di epoca in epoca: è ciò che intendo mostrare con un esempio da manuale circa la formazione del canone e la concezione teleologica della storia riferito ai classici viennesi.
description: Musica Docta, 2014: Transmission of musical knowledge: Constructing a European citizenship
Spiky membranes
Creators: name: Trzetrzelewski, Maciej
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study spiky configurations of membranes in the SO(d)xSU(N) invariant matrix models. A class of exact solutions (analogous to plane-waves) of the corresponding Schroedinger equation for an arbitrary N is discussed. If the large N limit is performed so that the energy scales like N^2, the N=infinity wavefunctions reduce to the ground state of the d-dimensional harmonic oscillator.
description: 16 pages, 1 figure
Educare alla complessità. Il ruolo della musica d'arte contemporanea
Creators: name: Pozzi, Raffaele
Publisher: name: Dipartimento delle Arti - Alma Mater Studiorum - Università di Bologna
Year: 2014

description: La relazione propone alcune riflessioni sul ruolo della musica d’arte contemporanea nella pedagogia della complessità. Le teorie della complessità formano un’area di pensiero ormai largamente consolidata nelle scienze umane e sociali. Tali teorie sottolineano l’importanza di concetti come discontinuità contraddizione non-linearità molteplicità caso caos, sia nei fenomeni naturali che in quelli culturali. In una serie di recenti pubblicazioni, l’epistemologo francese Edgar Morin ha elaborato una pedagogia basata sulla teoria della complessità. La musica d’arte contemporanea comprende un vasto repertorio di opere sulle quali poter fondare una pedagogia e una didattica della complessità in musica. La relazione suggerisce un possibile esempio di impiego e di trasposizione didattica di un brano, B.A.C.H. per pianoforte solo, opera del compositore italiano Aldo Clementi, risalente al 1970.
description: Musica Docta, 2014: Transmission of musical knowledge: Constructing a European citizenship
Development of Recoverable Adsorbents for Cr(VI) Ions by Grafting of a Dimethylamino Group-Containing Monomer on Polyethylene Substrate and Subsequent Quaternization
Creators: name: Yamada, Kazunori
name: Kitao, Yoshinori
name: Asamoto, Hiromichi
name: Minamisawa, Hiroaki
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Marine Biology
subject: Hematology

description: A polymeric adsorbent for removal of hexavalent chromium (Cr(VI)) ions was developed by the photografting of 2-(dimethylamino)ethyl methacrylate (DMAEMA) to a polyethylene (PE) mesh and subsequent quaternization with iodoalkanes of different alkyl chain lengths. The grafting of DMAEMA and subsequent quaternization were verified by the FT-IR and XPS measurements. The Cr(VI) ion adsorption capacity of the DMAEMA-grafted PE meshes had the maximum value at the grafted amount of 2.6 mmol/g in a 0.20 mM K2Cr2O7 solution at pH 3.0 and 30°C. The adsorption behavior obeyed the pseudo-second order kinetic model and well expressed by Langmuir isotherm. These results suggest that the Cr(VI) ion adsorption occurs through the electrostatic interaction mainly between protonated dimethylamino groups and hydrochromate (HCrO4-) ions. The adsorption capacity of the quaternized PE-g-PDMAEMA meshes increased with an increase in the degree of quaternization and/or the alkyl chain length of the iodoalkanes used and the maximum adsorption ratio was obtained at the degree of quaternization of 54.2% for the iodoheptane-quaternized PE-g-PDMAEMA (PE-g-QC7PDMAEMA) mesh. This value was about 1.86 times higher than that of the PE-g-PDAMEMA mesh. Cr(VI) ions were successfully desorbed from the PE-g-PDMAEMA and PE-g-QC7PDMAEMA meshes in eluents such as NaOH, NaCl, and NH4Cl. In 0.50 M NaCl, 0.10 M NH4Cl, and 0.50 mM NaOH, the adsorption and desorption process was repeatedly performed without any considerable decrease and the desorption behavior obeyed the pseudo-second order kinetic model. These results emphasize that the PE-g-PDMAEMA meshes and their quaternized products can be applied as an adsorbent for Cr(VI) ions.