cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Goal-Auxiliary Actor-Critic for 6D Robotic Grasping with Point Clouds
Creators: name: Wang, Lirui
name: Xiang, Yu
name: Yang, Wei
name: Mousavian, Arsalan
name: Fox, Dieter
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: 6D robotic grasping beyond top-down bin-picking scenarios is a challenging task. Previous solutions based on 6D grasp synthesis with robot motion planning usually operate in an open-loop setting, which are sensitive to grasp synthesis errors. In this work, we propose a new method for learning closed-loop control policies for 6D grasping. Our policy takes a segmented point cloud of an object from an egocentric camera as input, and outputs continuous 6D control actions of the robot gripper for grasping the object. We combine imitation learning and reinforcement learning and introduce a goal-auxiliary actor-critic algorithm for policy learning. We demonstrate that our learned policy can be integrated into a tabletop 6D grasping system and a human-robot handover system to improve the grasping performance of unseen objects. Our videos and code can be found at https://sites.google.com/view/gaddpg .
Quantum signature scheme with single photons
Creators: name: Wang, Jian
name: Zhang, Quan
name: Tang, Chao-jing
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum digital signature combines quantum theory with classical digital signature. The main goal of this field is to take advantage of quantum effects to provide unconditionally secure signature. We present a quantum signature scheme with message recovery without using entangle effect. The most important property of the proposed scheme is that it is not necessary for the scheme to use Greenberger-Horne-Zeilinger states. The present scheme utilizes single photons to achieve the aim of signature and verification. The security of the scheme relies on the quantum one-time pad and quantum key distribution. The efficiency analysis shows that the proposed scheme is an efficient scheme.
Sand mulch-aided ambient-air fabrication of microporous cocoa waste derived-activated carbon for methylene blue adsorption
Creators: name: Yeboah, Martin Luther
name: Zhou, Shixue
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Hematology
subject: Plant Biology
subject: FOS: Biological sciences

description: Porous carbon materials for adsorption applications are regarded as one of the most viable water cleaning strategies. Cocoa pod husk (CPH) was treated with two-step catalytic pyrolysis employing hydroxides and carbonates of sodium and potassium to synthesise activated carbon for methylene blue (MB) decolourisation. Dye adsorption assessment of activated carbon prepared with various activators (NaOH, KOH, Na2CO3 and K2CO3) established KOH-derived activated carbon as a superior absorbent. Upon impregnation ratio optimisation with KOH, CPHAC-3K (CPH: KOH of 3) prepared at 800°C acquired a BET surface area, pore volume and pore size of 1688.4 m2/g, 0.76 cm3/g and 1.25 nm, respectively. The maximum MB adsorption capacity of CPHAC-3K was 445 mg/g, demonstrating an impressive adsorption property compared with literature. The dye adsorption of CPHAC-3K was mainly attributed to its excellent textural property (microporous) and numerous oxygen-containing functional groups on the surface, as shown by BET and FTIR studies, respectively. Adsorption investigations demonstrated that the Langmuir adsorption isotherm and pseudo-second-order kinetic model effectively represented the adsorption process, with a considerable contribution from electrostatic and π-π interactions, pore filling and hydrogen bonding. This work established that CPHAC-3K generated through an optimised preparation process and conditions may be used as an efficient adsorbent compared to some previously reported biomass-based activated carbon to remove cationic dyes from wastewater.
The politics of state formation in India : the case of Uttarakhand
Creators: name: Mishra, Sangeeta
Publisher: name: University of British Columbia
Year: 2009

description: The recently ratified new states in India have profound implications for understanding the capability of federations globally to accommodate the increasing number of autonomy demands. Granting state status to regions seeking autonomy seems to be one solution to achieving greater stability and unity in a state. However, before fully embracing this as a solution to possible fragmenting tendencies and ultimate cases of dis-unification, it becomes necessary to examine in what context regions are given state status. The political factors determining the fate of statehood movements in India is the topic of this thesis. In August 2000, the India parliament approved three new India states. The newly created states in India were not unpredicted events. Many of these regions had been seeking separate statehood since pre-independence. However what makes this an interesting topic is to consider why now, why have the regions have been granted state status. This thesis looks at one case study, the case of Uttarakhand, and attentively follows it journey to statehood. A region in the northern Himalayas, the area cites lagging economic and social conditions, along with a separate cultural lifestyle from its host state Uttar Pradesh. This thesis begins to address this political event by first examining past attempts at explaining why and how new states were created within a federal institutional design. Ultimately, the thesis disregards a fully federal explanation as the real understanding for why these movements occur. Instead, it looks to contemporary political conditions in which statehood movements are likely to be determined. In particular, I argue that coalition politics along with its by-products of leadership and institutional accommodation play a significant role in determining the fate of these movements. Although I recognize that the ability of groups to mobilize around given issues is imperative, I argue that these are not primary considerations when governments decide whether to grant or to not concede statehood demands.
Selective adsorption of drug micropollutants from synthetic wastewater using hydrochar derived from carbonisation of unused leaves
Creators: name: Sachan, Deepa
name: Das, Gopal
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Medicine
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified

description: One-step hydrothermal carbonisation method was used to synthesise hydrochar, SRL HC (Saccarum ravannae hydrochar), and SOL HC (Saccarum oficinarum hydrochar), which were employed to remove highly toxic and emerging contaminants drugs, diclofenac, ibuprofen, and naproxen from the synthetic aquatic environment. The presence of hydroxyl and carboxylic acid groups makes these hydrochars an efficient adsorbent. The adsorption experiments were conducted to optimise various parameters such as pH, adsorbent dose, contact time, and temperature. Then maximum adsorption capacity of diclofenac, ibuprofen, and naproxen on SRL HC was found to be 230.04, 201.92, 191.43 mg/g, while the maximum adsorption capacity of SOL HC were 103.40, 77.72, 62.02 mg/g at 303 K. The adsorption of drugs fits well with the pseudo-second-order kinetics model and the Langmuir adsorption isotherm model with a high correlation coefficient (R2 ˃ 0.99). Thermodynamic studies indicated that adsorption was chemisorptive and endothermic. Adsorption in real water samples along with reusability was also performed with these hydrochars.
Stability of classical shock fronts for compressible hyperelastic materials of Hadamard type
Creators: name: Plaza, Ramón G.
name: Vallejo, Fabio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q74, 35L65, 35L67, 74J40

description: This paper studies the uniform and weak Lopatinski\uı conditions associated to classical (Lax) shock fronts of arbitrary amplitude for compressible hyperelastic materials of Hadamard type in several space dimensions. Thanks to the seminal works of Majda (Mem. Amer. Math. Soc. 43 (1983), no. 281; Mem. Amer. Math. Soc. 41 (1983), no. 275) and Métivier (Trans. Amer. Math. Soc. 296 (1986), pp. 431-479; Comm. Partial Diff. Eqs. 15 (1990), no. 7, pp. 983-1028), the uniform Lopatinski\uı condition ensures the local-in-time, multidimensional, nonlinear stability of such fronts. The stability function (also called Lopatinski\uı determinant) for shocks of arbitrary amplitude in this large class of hyperelastic materials is computed explicitly. This information is used to establish the conditions for uniform and weak shock stability in terms of the parameters of the shock and of the elastic moduli of the material.
description: Accepted for publication in Arch. Ration. Mech. Anal. 59 pages, 3 figures
Assessment of physicochemical parameters and trace metal elements from untreated and treated wastewater of an analysis laboratory, Yaoundé-Cameroon
Creators: name: Bertrand, Zing Zing
name: Valerie, Mounoumeck Patrick
name: Desiré, Belibi Belibi Placide
name: Camdessus, Nono Lowe Ronald
name: Zaara, Fatimatou
name: Aboubakar, Amina
name: Armelle, Moussima Yaka Diane
name: Béatrice, Nzeket Aline
name: Mbadcam, Ketcha Joseph
name: Yvette, Mfopou Mewouo Clarisse
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Plant Biology

description: The main emphasis of this study is to assess the status of daily released effluent before and after treatment with both Corn Cobs Activated Carbon (CCAC) and eggshells, with a focus on raising its pH to acceptable levels for agricultural irrigation. The physical properties of CCAC revealed that, it contained 5.82 % ash and had a point zero charge of 5.35. Before and after each treatment, the Electrical Conductivity and Total Dissolved Solids ranged from (248.3 ± 0.9) µS/cm to (285.3 ± 0.7) µS/cm and (124.00 ± 0.56) mg/L to (142.33 ± 0.34) mg/L, respectively; the pH of 6.98 ± 0.03, was found to be within the Food and Agricultural Organization of the United Nations (FAO) allowable limits for irrigation purposes. The average mean concentrations analysis of trace metal elements with Inductively Coupled plasma Optical Emission Spectrometry ranged from (0.000 ± 0.000) mg/L to (0.76 ± 0.02) mg/L for untreated and treated wastewater. After the final treatment, the concentrations of Fe2+ ions were lower than those of Zn2+, Cu2+, and Mn2+, but they were all within the FAO’s permissible limits. Similarly, the mean values for the removal efficiency of trace metal elements revealed that, Zn2+, Cu2+, and Mn2+ ions are 100 % decontaminated, whereas only 84.33 % Fe2+ ions are removed with 500 grams of eggshells. There are both positive and negative correlations between physicochemical parameters and trace metal elements. The Principal Component Analysis results of two latent factors explain 61.95 % and 29.14 % of the total variance into three groups, with all trace metal elements forming a single group. The one-way ANOVA revealed a highly significant difference between parameters and treatments at p 0.05. These findings suggest that, CCAC and eggshells have shown promising applications for industrial wastewater treatment and can be easily adopted by analytical laboratories.
Mitigation of Space-Charge-Driven Resonance and Instability in High-Intensity Linear Accelerators via Beam Spinning
Creators: name: Cheon, Yoo-Lim
name: Moon, Seok-Ho
name: Chung, Moses
name: Jeon, Dong-O
Publisher: name: arXiv
Year: 2020
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: For modern high-intensity linear accelerators, the well-known envelope instability and recently reported fourth-order particle resonance impose a fundamental operational limit (i.e., zero-current phase advance should be less than 90 deg). Motivated by the stability of spinning flying objects, we propose a novel approach of using spinning beams to surpass this limit. We discovered that spinning beams have an intrinsic characteristic that can suppress the impact of the fourth-order resonance on emittance growth and the associated envelope instability.
Braneworlds
Creators: name: Durrer, Ruth
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This course is an introduction to the physics of braneworlds. We concentrate on braneworlds with only one extra-dimension and discuss their gravity. We derive the gravitational equations on the brane from the bulk Einstein equation and explore some limits in which they reduce to 4-dimensional Einstein gravity. We indicate how cosmological perturbations from braneworlds are probably very different from usual cosmological perturbations and give some examples of the preliminary results in this active field of research. For completeness, we also present an introduction to 4-dimensional cosmological perturbation theory and, especially its application to the anisotropies of the cosmic microwave background.
description: 39 pages, 12 Figures, course given at the XI Brazilian School of Cosmology and Gravitation
Bacteria and fungi mediated degradation of poly aromatic hydrocarbons and effect of surfactant Tween-80
Creators: name: Khandelwal, Ashish
name: Nain, Lata
name: Singh, Shashi Bala
name: Varghese, Eldho
name: Sharma, Anamika
name: Gupta, Suman
name: Singh, Neera
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Molecular Biology
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Biological Sciences not elsewhere classified

description: Microorganisms (17 bacteria and 3 fungi) isolated from crude oil-contaminated soils were evaluated for degradation of five polyaromatic hydrocarbons (PAHs), both in the absence (-T80) and the presence of surfactant Tween-80 (+T80) at a 10 mg L−1 concentration of each PAH. Results of the heat map and Tukey HSD revealed that highest PAH degradation was observed by Kocuria rosea in +T80 treatment. Degradation (%) of individual PAH (-T80, +T80) was naphthalene: 96.6, 98.9; fluorene: 93.8, 95.1; phenanthrene: 58.1, 70.9; anthracene: 19.9, 32.5 and pyrene: 13.8, 54.7, respectively. Tukey HSD further revealed that all three fungi Trichoderma atroviride, Aspergillus nidulans and Aspergillus sydowii showed almost similar degradation of selected PAH. Based on degradation ability, consortia of K. rosea and A. sydowii were used for PAH degradation at 10, 50 and 100 mg L−1 in the presence of Tween-80. Results suggested that PAH degradation slowed down with the increase in the concentration. PAH degradation products phthalic acid and anthrone or phenanthrene-9,10 oxide or 9-phenanthrol were identified as a product of degradation. Bacterial strain Arthrobacter pascens, Pseudomonas aeruginosa, Bacillus megaterium, Bacillus sp., Bacillus niacini and Bacillus siamensis showed high fluorescence diacetate (FDA) hydrolase activity, whilst A. pascens, K. rosea, Pseudomonas sp. and B. niacini showed a significant soluble protein content.
Quantum Field Theories in Nonextensive Tsallis Statistics
Creators: name: Kohyama, H.
name: Niegawa, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Within the framework of Tsallis statistics with q ~ 1, we construct a perturbation theory for treating relativistic quantum field systems. We find that there appear initial correlations, which do not exist in the Boltzmann-Gibbs statistics. Applying this framework to a quark-gluon plasma, we find that the so-called thermal masses of quarks and gluons are smaller than in the case of Boltzmann-Gibbs statistics.
description: 16 pages, no figures
The Kolmogorov-Sinai entropy for dilute systems of hard particles in equilibrium
Creators: name: de Wijn, Astrid S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: In an equilibrium system, the Kolmogorov-Sinai entropy, $h_{\mathrm{KS}}$, equals the sum of the positive Lyapunov exponents, the exponential rates of divergence of infinitesimal perturbations. Kinetic theory may be used to calculate the Kolmogorov-Sinai entropy for dilute gases of many hard disks or spheres in equilibrium at low number density $n$. The density expansion of $h_{\mathrm{KS}}$ is $N \barνA [\ln n + B + O(n)]$, where $\barν$ is the single-particle collision frequency. Previous calculations of $A$ were succesful. Calculations of $B$, however, were unsatisfactory. In this paper, I show how the probability distribution of the stretching factor can be determined from a nonlinear differential equation by an iterative method. From this the Kolmogorov-Sinai entropy follows as the average of the logarithm of the stretching factor per unit time. I calculate approximate values of $B$ and compare these to results from existing simulations. The agreement is good.
description: submitted to pre
Amount of quantum coherence needed for measurement incompatibility
Creators: name: Kiukas, Jukka
name: McNulty, Daniel
name: Pellonpää, Juha-Pekka
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A pair of quantum observables diagonal in the same "incoherent" basis can be measured jointly, so some coherence is obviously required for measurement incompatibility. Here we first observe that coherence in a single observable is linked to the diagonal elements of any observable jointly measurable with it, leading to a general criterion for the coherence needed for incompatibility. Specialising to the case where the second observable is incoherent (diagonal), we develop a concrete method for solving incompatibility problems, tractable even in large systems by analytical bounds, without resorting to numerical optimisation. We verify the consistency of our method by a quick proof of the known noise bound for mutually unbiased bases, and apply it to study emergent classicality in the spin-boson model of an N-qubit open quantum system. Finally, we formulate our theory in an operational resource-theoretic setting involving "genuinely incoherent operations" used previously in the literature, and show that if the coherence is insufficient to sustain incompatibility, the associated joint measurements have sequential implementations via incoherent instruments.
description: 19 pages, 3 figures, identical to published version
Beaupère, René, Böckle, Franz, Dupont, Jacques, van Leeuwen, Peter A., Orsy, Ladislas M.: Die Mischehe in ökumenischer Sicht...
Creators: name: Wilkens, Erwin
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 18 Nr. 4 (1969): Ökumenische Rundschau, Band 18, Heft 4
Fast and Versatile Thermo-osmotic Flows with a Pinch of Salt
Creators: name: Herrero, Cecilia
name: Féliciano, Michael De San
name: Merabia, Samy
name: Joly, Laurent
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Thermo-osmotic flows - flows generated in micro and nanofluidic systems by thermal gradients - could provide an alternative approach to harvest waste heat. However, such use would require massive thermo-osmotic flows, which are up to now only predicted for special and expensive materials. There is thus an urgent need to design affordable nanofluidic systems displaying large thermo-osmotic coefficients. In this paper we propose a general model for thermo-osmosis of aqueous electrolytes in charged nanofluidic channels, taking into account hydrodynamic slip, together with the different solvent and solute contributions to the thermo-osmotic response. We apply this model to a wide range of systems, by studying the effect of wetting, salt type and concentration, and surface charge. We show that intense thermo-osmotic flows can be generated using slipping charged surfaces. We also predict for intermediate wettings a transition from a thermophobic to a thermophilic behavior depending on the surface charge and salt concentration. Overall, this theoretical framework opens an avenue for controlling and manipulating thermally induced flows with common charged surfaces and a pinch of salt.
description: 7 pages, 3 figures
Landau gauge ghost and gluon propagators and the Faddeev-Popov operator spectrum
Creators: name: Sternbeck, A.
name: Ilgenfritz, E. -M.
name: Müller-Preussker, M.
name: Schiller, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In this talk we report on a recent lattice investigation of the Landau gauge gluon and ghost propagators in pure SU(3) lattice gauge theory with a special emphasis on the Gribov copy problem. In the (infrared) region of momenta $q^2 \le 0.3 \mathrm{GeV}^2$ we find the corresponding MOM scheme running coupling $α_s(q^2)$ to rise in $q$. We also report on a first SU(3) computation of the ghost-gluon vertex function showing that it deviates only weakly from being constant. In addition we study the spectrum of low-lying eigenvalues and eigenfunctions of the Faddeev-Popov operator as well as the spectral representation of the ghost propagator.
description: talk given by M. M.-P. at the Workshop on Computational Hadron Physics, Cyprus, September 2005
Adsorptive removal of phenol from aqueous solution using chemically modified Saccharum officinarum biomass: modelling and process optimisation
Creators: name: Darla, Upendra R.
name: Lataye, Dilip H.
name: Zaidi, Zakiullah
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: This article proposes a way to extract phenol from aqueous solution as synthetic wastewater through the biomass (saccharum officinarum)-derived ZnCl2-activated carbon named as SBAC. The surface area and pore radius of SBAC were found to be 415.960 m2/g and 0.725 nm, respectively. Batch adsorption studies were carried out to analyse the percentage removal of phenol under various conditions, such as initial concentration (50–500 mg/L), initial pH (2–12), adsorbent dosage (2–40 g/L), temperature (283–303 K) and contact time (30–360 min). The proposed study has achieved ~94% of maximum phenol extraction, with the adsorption capacity of 9.44 mg/g at an initial concentration of 50 mg/L, dose of 5 g/L, pH of 5.5, contact time of 60 min and temperature of 303 K. The kinetic and equilibrium studies confirmed pseudo-second-order reaction and Radke-Prausnitz isotherm as the best fit. In thermodynamic study, the negative values of ΔG0ads (−21.448 to −24.330 kJ/mol), ΔH0 (−1.059 kJ/mol) and positive value of ΔS0 (0.072 kJ/mol K) confirmed the spontaneity, exothermic nature and randomness of adsorption process, respectively. Regeneration and reusability of SBAC showed 86.45% removal of phenol till fifth consecutive cycles. Cost analysis revealed that the developed SBAC was 14 times less expensive (~718 INR/ 9 $) than commercial activated carbon. From the present study, the developed adsorbent found to be good for wastewater treatment under ambient reaction conditions to achieve clean water.
Generic aspects of the resource theory of quantum coherence
Creators: name: Cunden, Fabio Deelan
name: Facchi, Paolo
name: Florio, Giuseppe
name: Gramegna, Giovanni
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The class of incoherent operations induces a pre-order on the set of quantum pure states, defined by the possibility of converting one state into the other by transformations within the class. We prove that if two $n$-dimensional pure states are chosen independently according to the natural uniform distribution, then the probability that they are comparable vanishes as $n\rightarrow\infty$. We also study the maximal success probability of incoherent conversions and find an explicit formula for its large-$n$ asymptotic distribution. Our analysis is based on the observation that the extreme values (largest and smallest components) of a random point uniformly sampled from the unit simplex are distributed asymptotically as certain explicit homogeneous Markov chains.
description: 12 pages, 4 figures
How do clarinet players adjust the resonances of their vocal tracts for different playing effects
Creators: name: Fritz, Claudia
name: Wolfe, Joe
Publisher: name: arXiv
Year: 2005
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: In a simple model, the reed of the clarinet is mechanically loaded by the series combination of the acoustical impedances of the instrument itself and of the player's vocal tract. Here we measure the complex impedance spectrum of players' tracts using an impedance head adapted to fit inside a clarinet mouthpiece. A direct current shunt with high acoustical resistance allows players to blow normally, so the players can simulate the tract condition under playing conditions. The reproducibility of the results suggest that the players' "muscle memory" is reliable for this task. Most players use a single, highly stable vocal tract configuration over most of the playing range, except for the altissimo register. However, this 'normal' configuration varies substantially among musicians. All musicians change the configuration, often drastically for "special effects'' such as glissandi and slurs: the tongue is lowered and the impedance magnitude reduced when the player intends to lower the pitch or to slur downwards, and vice versa.
Age dissection of the vertical breathing motions in Gaia DR2: evidence for spiral driving
Creators: name: Ghosh, Soumavo
name: Debattista, Victor P.
name: Khachaturyants, Tigran
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Gaia DR2 has revealed breathing motions in the Milky Way, with stars on both sides of the Galactic mid-plane moving coherently towards or away from it. The generating mechanism of these breathing motions is thought to be spiral density waves. Here we test this hypothesis. Using a self-consistent, high-resolution simulation with star formation, and which hosts prominent spirals, we first study the signatures of breathing motions excited by spirals. In the model, the breathing motions induced by the spiral structure have an increasing amplitude with distance from the mid-plane, pointing to an internal cause for them. We then show that, at fixed height, the breathing motion amplitude decreases with age. Next, we investigate the signature of the breathing motions in the Gaia DR2 dataset. We demonstrate that, at the location with a consistently large breathing motion, the corresponding amplitude increases monotonically with distance from the mid-plane, in agreement with the model. Furthermore, we show that at the same location, the breathing motion amplitude decreases with age, again similar to what we find in the model. This strengthens the case that the observed breathing motions are driven by spiral density waves.
description: 17 pages, 19 figures, accepted for publication in MNRAS
GAINS OF REGIONAL COOPERATION: ENVIRONMENTAL PROBLEMS AND SOLUTIONS
Creators: name: Markandya, Anil
name: Markandya, Anil
Publisher: name: Unknown
Year: 2004
Subjects: Environmental Economics and Policy

description: Cooperation between the states of the Caucasus and Central Asia is paramount in solving the region's environmental problems. Given the acute socio-economic difficulties they face, their slow progress is understandable. Serious environmental and socio-economic consequences cumulate as the neglect persists. Increased oil and gas revenues (for those who have access to these resources) cannot ease such consequences. The exploitation of oil revenues may benefit the national economy, but it does not generally provide enough for the poor local communities that depend on the natural resources of the Caspian for their livelihoods. The international community must therefore help to promote cooperation within the region. The Caspian Environment Program provides an example of the kinds of things that need to be done, but more resources are needed for sustainable development. Perhaps the oil companies will do more, given their long-term stake in the region. In addition, the countries themselves can, and should, allocate more funds for the sustainable development of the region, but co-ordinated programs will be required to dissuade governments from seeking a "free ride" on the good actions of the others.
Magnetic domain structure and dynamics in interacting ferromagnetic stacks with perpendicular anisotropy
Creators: name: Wiebel, S.
name: Jamet, J. P.
name: Vernier, N.
name: Mougin, A.
name: Ferre, J.
name: Baltz, V.
name: Rodmacq, B.
name: Dieny, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The time and field dependence of the magnetic domain structure at magnetization reversal were investigated by Kerr microscopy in interacting ferromagnetic Co/Pt multilayers with perpendicular anisotropy. Large local inhomogeneous magnetostatic fields favor mirroring domain structures and domain decoration by rings of opposite magnetization. The long range nature of these magnetostatic interactions gives rise to ultra-slow dynamics even in zero applied field, i.e. it affects the long time domain stability. Due to this additionnal interaction field, the magnetization reversal under short magnetic field pulses differs markedly from the well-known slow dynamic behavior. Namely, in high field, the magnetization of the coupled harder layer has been observed to reverse more rapidly by domain wall motion than the softer layer alone.
description: 42 pages including 17 figures. submitted to JAP
GROWTH, POVERTY AND ASSET ALLOCATION: THE ROLE OF THE STATE
Creators: name: Lopez, Ramon E.
name: Lopez, Ramon E.
Publisher: name: Unknown
Year: 2001
Subjects: Political Economy

description: This paper studies the consequences of certain widespread policies for the quality and sustainability of growth. These policies cause economic inefficiency, environmental destruction and increased poverty. The paper develops a political economy model to show why the existence of such policies is not likely to be the fruit of errors or miscalculations by policy-makers. A key characteristic that distinguishes this analysis from other political economy analyses is that it allows for an essential asymmetry in the political lobby, with the wealthy having the ability to influence governments through bribes and political contributions while the poor are unable to do so. The key consequence of this is that the policy setting tends to perpetuate or even worsen an initial level of concentration of wealth. Policies are biased in favor of those who can afford to lobby and pay bribes, thus generally preventing policies that improve the initial wealth distribution. At the same time these resulting policies are likely to be detrimental for growth in the long run. We illustrate some of these ideas with a formal general equilibrium model of an agrarian economy with emerging capitalist sectors, where the allocation of land between peasants and capitalists takes place via a political equilibrium instead of via market mechanisms. We show that the resulting land allocation not only reduces the income of peasants but is also inefficient and contributes to environmental degradation of the land left with the peasants. At the same time the model shows that in the early stages of capitalist accumulation wages are likely to fall while peasants' income continues to decline throughout all stages of capital accumulation.
Comments on the paper by S. Samuel "On the speed of gravity and the Jupiter/Quasar measurement"
Creators: name: Kopeikin, Sergei M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Recent review article by S. Samuel "On the speed of gravity and the Jupiter/Quasar measurement" published in the International Journal of Modern Physics D13, 1753 (2004) provides the reader with a misleading "theory" of the relativistic time delay in general theory of relativity. Furthermore, it misquotes original publications by Kopeikin and Fomalont & Kopeikin related to the measurement of the speed of gravity by VLBI. We summarize the general relativistic principles of the Lorentz-invariant theory of propagation of light in time-dependent gravitational field, derive Lorentz-invariant expression for the relativistic time delay, and finally explain why Samuel's "theory" is conceptually incorrect and confuses the speed of gravity with the speed of light.
description: 14 pages, one figure, text improved, references added
ENVIRONMENTAL AND FOOD SAFETY STANDARDS IN THE CONTEXT OF TRADE LIBERALIZATION: ISSUES AND OPTIONS
Creators: name: Grote, Ulrike
name: Engel, Stefanie
name: Grote, Ulrike
name: Engel, Stefanie
Publisher: name: Unknown
Year: 2001
Subjects: Environmental Economics and Policy
Food Consumption/Nutrition/Food Safety
International Relations/Trade

description: The current debate on trade liberalization is accompanied by an increased concern about environmental and food safety issues leading to frictions of different country groups under the World Trade Organization (WTO). This discussion paper aims at shedding more light on some of the issues in the "trade and environment" debate. It describes the complex process of setting standards, the relevant WTO agreements dealing with technical as well as sanitary and phytosanitary standards and potential outcomes of setting environmental standards-outcomes for the environment, for international trade relations and the competitiveness of countries. The theoretical part shows that under certain assumptions, not only protectionist but also environmental concerns may lead to a political decision for suboptimal standards. Finally, the paper offers a list of alternative policy responses and strategies to tackle environmental issues in the context of international trade. This includes the polluter-pays principle, eco-labeling and other labeling schemes, reducing in- and output subsidies, stronger enforcement of given standards, technical assistance, harmonization and mutual recognition of equivalent standards, and multilateral environmental agreements (MEAs). It is concluded that while no individual strategy proves to be the optimal solution, a mixture of different approaches is needed and care has to be taken to avoid the misuse of environmental standards for protectionist reasons. The participation of developing countries should be increased when setting standards at international level, defining criteria for eco-labels or negotiating MEAs.
Dualisation of the Symmetric Space Sigma Model with Couplings
Creators: name: Dereli, Tekin
name: Yilmaz, Nejat T.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The first-order formulation of the G/K symmetric space sigma model of the scalar cosets of the supergravity theories is discussed when there is coupling of (m-1)-form matter fields. The Lie superalgebra which enables the dualized coset formulation is constructed for a general scalar coset G/K with matter coupling where G is a non-compact real form of a semi-simple Lie group and K is its maximal compact subgroup.
description: 17 pages
Joint Subgraph-to-Subgraph Transitions -- Generalizing Triadic Closure for Powerful and Interpretable Graph Modeling
Creators: name: Hibshman, Justus
name: Cedre, Daniel Gonzalez
name: Sikdar, Satyaki
name: Weninger, Tim
Publisher: name: arXiv
Year: 2020
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences
subject: I.2.6

description: We generalize triadic closure, along with previous generalizations of triadic closure, under an intuitive umbrella generalization: the Subgraph-to-Subgraph Transition (SST). We present algorithms and code to model graph evolution in terms of collections of these SSTs. We then use the SST framework to create link prediction models for both static and temporal, directed and undirected graphs which produce highly interpretable results. Quantitatively, our models match out-of-the-box performance of state of the art graph neural network models, thereby validating the correctness and meaningfulness of our interpretable results.
description: Published in WSDM 2021
STRATEGIC TARGETING OF DEVELOPMENT POLICIES TO A COMPLEX REGION: A GIS-BASED STRATIFICATION APPLIED TO UGANDA
Creators: name: Ruecker, Gerd Robert
name: Park, Soojin
name: Ssali, Henry
name: Pender, John L.
name: Ruecker, Gerd Robert
name: Park, Soojin
name: Ssali, Henry
name: Pender, John L.
Publisher: name: Unknown
Year: 2003
Subjects: International Development

description: It is often the case that national policies are not necessarily suitable at lower administrative levels due to the spatial complexity of natural and socio-economic resources within a country. That complexity of resources can be resolved by spatial modeling of natural and socio-economic variation. We propose a new GIS-based stratification algorithm to demarcate homogenous development domains at national level and applied that algorithm to Uganda. Based on that stratification, we assembled various spatial information to assess comparative advantages and disadvantages of these development domains for potential pathways of economic development. We expect that our stratification strategy may help policy makers and regional planners to target development investments more efficiently towards sustainable agriculture in Uganda.
Lortz, Joseph, Iserloh, Erwin: Kleine Reformationsgeschichte
Creators: name: Mumm, Reinhard
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 18 Nr. 4 (1969): Ökumenische Rundschau, Band 18, Heft 4
SELLING EXPERT KNOWLEDGE: THE ROLE OF CONSULTANTS IN SINGAPORE'S NEW ECONOMY
Creators: name: Evers, Hans-Dieter
name: Menkhoff, Thomas
name: Evers, Hans-Dieter
name: Menkhoff, Thomas
Publisher: name: Unknown
Year: 2002
Subjects: International Development

description: In the emerging globalised knowledge society/economy, a group of professionals, namely experts and consultants gain in importance. The paper discusses the following issues: Who are these experts and consultants? Why is this group of knowledge workers strategically important and why is their importance - socially in terms of number of persons and economically in terms of output or turnover - growing? How can we explain the increasing professionalisation of consultants? How do they gain their expertise and which role does academic knowledge play in professional attainment? How do consultants package and apply expert knowledge? What are the challenges experts and consultants are facing in the new economy? Data from a survey of local consultancy firms are used to construct a profile of the Singapore consulting industry, their staff and their professional organisations. International consultants are more aggressive in advertising and selling their expertise than local consultants. They tend to distance themselves from academics as the producers of innovative knowledge, but stress their own experience. Finally we discuss the new situation under which consultants have to operate in the new economy.
PRIVATE SECTOR DEVELOPMENT AND COMPETITIVENESS IN GHANA
Creators: name: Wolf, Susanna
name: Wolf, Susanna
Publisher: name: Unknown
Year: 2003
Subjects: Political Economy

description: Ghana has a relatively good international reputation with respect to political stability and macroeconomic reforms. However, its success with developing the private sector and attracting investment has at best been mixed. Therefore the new government that came into power in 2001 proclaimed a "Golden Age of Business". Competitiveness and private sector development are closely interlinked. On the one hand the factors that influence the competitiveness of a country are a precondition for private sector development. On the other hand only if the private enterprises act in a competitive manner and use their entrepreneurial possibilities to compete, support programmes for the private sector will be successful. Competitiveness can be measured at different levels. The real exchange rate covers the competitiveness of a whole economy, it fluctuated significantly in Ghana over the past decade. The revealed comparative advantage index and value added per employee explore the relative competitiveness of different sectors. Especially for plastic and metal products they both show that Ghana is increasingly competitive.
Exact cohomology sequences with integral coefficients for torus actions
Creators: name: Franz, Matthias
name: Puppe, Volker
Publisher: name: arXiv
Year: 2005
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 55N91 (primary), 53D20 (secondary)

description: Using methods applied by Atiyah in equivariant K-theory, Bredon obtained exact sequences for the relative cohomologies (with rational coefficients) of the equivariant skeletons of (sufficiently nice) T-spaces, T=(S^1)^n, with free equivariant cohomology over the cohomology of BT. Here we characterise those finite T-CW complexes with connected isotropy groups for which an analogous result holds with integral coefficients.
description: similar main result as in our preprint math.AT/0307112, but the proof is more elementary; 10 pages; final version
OPEN BORDERS, OPEN REGIMES? TESTING CAUSAL DIRECTION BETWEEN GLOBALIZATION AND DEMOCRACY, 1970-2000
Creators: name: Burkhart, Ross E.
name: De Soysa, Indra
name: Burkhart, Ross E.
name: De Soysa, Indra
Publisher: name: Unknown
Year: 2003
Subjects: Political Economy

description: Pessimists on globalization claim that liberalization of markets allows multinational corporations free reign, constraining local autonomy and precipitating a "race to the bottom" that will endanger recent democratic gains. The optimists see the end of dirigiste economic models as favorable for political liberalization, envisioning foreign direct investment (FDI) as one way in which to transfer wealth to poor societies, leading to democracy. The most recent literature assesses this debate using FDI flows. We believe that FDI stocks is a superior variable, and captures the underlying idea of "saturation point" better. We create models of democracy and use estimates of FDI stock for 107-120 countries over the 1970-2000 time period as a principal control variable. We find that FDI Granger-causes democracy to a greater degree than the other way around. Cross-sectional time-series results show FDI's effect on democracy to be robust, independent of trade, income, urbanization, and historical and institutional factors. Trade is positively, but weakly, associated with democracy as well. It seems that poor countries stand to gain much from interdependence with the rich. The problem with globalization may be that it has not gone far enough.
IS THE WORLD BECOMING A MORE RISKY PLACE? TRENDS IN DISASTERS AND VULNERABILITY TO THEM
Creators: name: Felbruegge, Torsten
name: Von Braun, Joachim
name: Felbruegge, Torsten
name: Von Braun, Joachim
Publisher: name: Unknown
Year: 2002
Subjects: Resource /Energy Economics and Policy

description: Numerous publications about disasters are implying that disaster vulnerability is growing. The main reasons given for this are growing populations, climate change and increasing poverty. However, maybe the current perception of vulnerability to disasters rests primarily on a perspective focusing on the present and neglecting long-term trends. Moreover, a changed understanding of the term "disaster" perhaps reflects a changed perception of its scope. An intention of this study is the examination of the hypothesis that vulnerability to disasters has increased. To accomplish this, clarification is needed about what is, and what determines vulnerability. As a concept, "Vulnerability" to disasters is relevant for a world that changes rapidly in technological and settlement structures. Vulnerability can be manifested at different levels of analysis, from the individual to the household to the region and state. Apart from this, vulnerability differs according to the type of disaster. Because of the problems involved with the availability of data, the empirical part of this study primarily examines trends at the aggregate country and global level. The results show that on the whole, the number of registered disasters is rising. The monetary value of damage is also increasing. And the results show that people in developing countries suffer the most from disasters. However, - more importantly - the number of disasterrelated deaths has declined and the mortality risk induced by disasters has declined as well in the last two decades. In these crude terms, the world does not seem to become a more risky place. Improved organizational response and emergency aid contribute to that positive development.
Quantum Critical Scaling and origin of Non-Fermi-Liquid behavior in Sc$_{1-x}$U$_{x}$Pd$_3$
Creators: name: Wilson, Stephen D.
name: Dai, Pengcheng
name: Adroja, D. T.
name: Lee, S. -H.
name: Chung, J. -H.
name: Lynn, J. W.
name: Butch, N. P.
name: Maple, M. B.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use inelastic neutron scattering to study magnetic excitations of Sc$_{1-x}$U$_{x}$Pd$_3$ for U concentrations ($x=0.25$, 0.35) near the spin glass quantum critical point (QCP). The excitations are spatially incoherent, broad in energy ($E=\hbarω$), and follow $ω/T$ scaling at all wave vectors investigated. Since similar $ω/T$ scaling has been observed for UCu$_{5-x}$Pd$_x$ and CeCu$_{6-x}$Au$_{x}$ near the antiferromagnetic (AF) QCP, we argue that the observed non Fermi liquid (NFL) behavior in these $f$-electron materials arises from the critical phenomena near a T=0 K phase transition, irrespective of the nature of the transition.
description: Submitted to PRL