cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Resummation of Large Logarithms in $γ^* π^0 \to γ$
Creators: name: Feng, F.
name: Ma, J. P.
name: Wang, Q.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the collinear factorization of the form factor for the transition $γ^* π^0 \to γ$ the hard part contains double log terms as $\ln^2 x$ with $x$ as the momentum fraction of partons from 0 to 1. A simple exponentiation for resummation leads to divergent results. We study the resummation of these $\ln^2 x$ terms. We show that the $\ln^2 x$ terms come partly from the light-cone wave function(LCWF) and partly from the form factor. We introduce a jet factor to factorize the $\ln^2 x$ term in the form factor. To handel the $\ln^2 x$ terms from the LCWF we introduce a nonstandard light-cone wave function(NLCWF) with the gauge links off the light-cone direction. An interesting relation between two wave function is found. With the introduced NLCWF and the jet factor we can re-factorize the form factor and obtain a new hard part which does not contain terms with $\ln^2 x$. Beside the renormalization scale $μ$ the introduce NLCWF and jet factor have extra scales to characterize their $x$-behaviors. Using the evolutions of the extra scales and the relation we can do the resummation perturbatively in sense that the LCWF is the only nonpertubative object in the resumed formula. Our results with some models of LCWF show that there is a significant difference between numerical predictions with the resummation and that without the resummation, and the resummed predictions can describe the experimental data.
description: one reference added
Josephson effect through a quantum dot array
Creators: name: Bergeret, F. S.
name: Yeyati, A. Levy
name: Martin-Rodero, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We analyze the ground state properties of an array of quantum dots connected in series between superconducting electrodes. This system is represented by a finite Hubbard chain coupled at both ends to BCS superconductors. The ground state is obtained using the Lanczos algorithm within a low energy theory in which the bulk superconductors are replaced by effective local pairing potentials. We study the conditions for the inversion of the sign of the Josephson coupling ($π$-junction behavior) as a function of the model parameters. Results are presented in the form of phase diagrams which provide a direct overall view of the general trends as the size of the system is increased, exhibiting a strong even-odd effect. The analysis of the spin-spin correlation functions and local charges give further insight into the nature of the ground state and how it is transformed by the presence of superconductivity in the leads. Finally we study the scaling of the Josephson current with the system size and relate these results with previous calculations of Josephson transport through a Luttinger liquid.
description: 9 pages, 8 figures
Radial symmetry of solutions to anisotropic and weighted diffusion equations with discontinuous nonlinearities
Creators: name: Dipierro, Serena
name: Poggesi, Giorgio
name: Valdinoci, Enrico
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We prove radial symmetry for bounded nonnegative solutions of a weighted anisotropic problem. Given the anisotropic setting that we deal with, the term "radial" is understood in the Finsler framework. In the whole space, J. Serra obtained the symmetry result in the isotropic unweighted setting. In this case we provide the extension of his result to the anisotropic setting. This provides a generalization to the anisotropic setting of a celebrated result due to Gidas-Ni-Nirenberg and such a generalization is new even for in the case of linear operators whenever the dimension is greater than 2. In proper cones, the results presented are new even in the isotropic and unweighted setting for suitable nonlinear cases. Even for the previously known case of unweighted isotropic setting, the present paper provides an approach to the problem by exploiting integral (in)equalities which is new for $N>2$: this complements the corresponding symmetry result obtained via the moving planes method by Berestycki-Pacella.
Additional file 1 of Relationship, partner factors and stigma are associated with safer conception information, motivation, and behavioral skills among women living with HIV in Botswana
Creators: name: Gutin, Sarah A.
name: Harper, Gary W.
name: Moshashane, Neo
name: Ramontshonyana, Kehumile
name: Stephenson, Rob
name: Shade, Starley B.
name: Harries, Jane
name: Mmeje, Okeoma
name: Ramogola-Masire, Doreen
name: Morroni, Chelsea
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 1.
Analysis tools and methods for tritium data taking with the KATRIN experiment
Creators: name: Heizmann, Florian
Publisher: name: Karlsruhe
Year: 2019
Subjects: neutrino physics
KATRIN
WGTS
gas dynamics
tritium
blind analysis
new physics

description: Das KArlsruhe TRItium Neutrino (KATRIN) Experiment ist konstruiert, um die Neutrinomasse mit einer bisher unerreichten Sensitivität  von 200 meV (90 % C.L.) zu bestimmen. Dafür kombiniert KATRIN eine starke gasförmige Tritiumquelle mit einem hochauflösendem MAC-E-Filter-Spektrometer. Seit der Fertigstellung des experimentellen Aufbaus im Herbst 2016 hat das KATRIN-Experiment mehrere zentrale Meilensteine erreicht. In der vorliegenden Arbeit wird ein Gasmodell für den letzten dieser Meilensteine - die erste Tritium-Zirkulation in der Tritium-Quelle im Mai und Juni 2018 - vorgestellt, und mit unterschiedlichen Messmethoden verglichen. Mit Hilfe des Gasmodells werden die ersten Tritiumspektren analysiert, wobei verschiedene Methoden zur Berücksichtigung von Systematiken am Beispiel des Gasmodells untersucht werden. Vorbereitend auf die kommenden Neutrinomassendaten werden in dieser Arbeit Methoden für eine blinde Neutrinomassenanalyse von $\beta$-Zerfall-basierten Tritiumspektren vorgestellt, miteinander verglichen, und an Hand von Kryptondaten getestet. Die Arbeit schließt mit einem Ausblick auf das Potential von KATRIN, Physik jenseits der Neutrinomasse zu untersuchen. Für drei Beispiele wird exemplarisch die statistische Sensitivität von KATRIN bestimmt und mit bestehenden experimentellen Erkenntnissen verglichen.
Congruent numbers, elliptic curves, and the passage from the local to the global
Creators: name: Dalawat, Chandan Singh
Publisher: name: arXiv
Year: 2007
Subjects: subject: History and Overview (math.HO)
subject: General Mathematics (math.GM)
subject: FOS: Mathematics

description: The ancient unsolved problem of congruent numbers has been reduced to one of the major questions of contemporary arithmetic: the finiteness of the number of curves over $\bf Q$ which become isomorphic at every place to a given curve. We give an elementary introduction to congruent numbers and their conjectural characterisation, discuss local-to-global issues leading to the finiteness problem, and list a few results and conjectures in the arithmetic theory of elliptic curves.
Multivariate normal approximation in geometric probability
Creators: name: Penrose, Mathew D.
name: Wade, Andrew R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60D05 (Primary) 60F05, 60G57 (Secondary)

description: Consider a measure $μ_λ= \sum_x ξ_x δ_x$ where the sum is over points $x$ of a Poisson point process of intensity $λ$ on a bounded region in $d$-space, and $ξ_x$ is a functional determined by the Poisson points near to $x$, i.e. satisfying an exponential stabilization condition, along with a moments condition (examples include statistics for proximity graphs, germ-grain models and random sequential deposition models). A known general result says the $μ_λ$-measures (suitably scaled and centred) of disjoint sets in $R^d$ are asymptotically independent normals as $λ\to \infty$; here we give an $O(λ^{-1/(2d + ε)})$ bound on the rate of convergence. We illustrate our result with an explicit multivariate central limit theorem for the nearest-neighbour graph on Poisson points on a finite collection of disjoint intervals.
description: 23 pages
Universal quantum computation via quantum controlled classical operations
Creators: name: Horvat, Sebastian
name: Gao, Xiaoqin
name: Dakić, Borivoje
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A universal set of gates for (classical or quantum) computation is a set of gates that can be used to approximate any other operation. It is well known that a universal set for classical computation augmented with the Hadamard gate results in universal quantum computing. Motivated by the latter, we pose the following question: can one perform universal quantum computation by supplementing a set of classical gates with a quantum control, and a set of quantum gates operating solely on the latter? In this work we provide an affirmative answer to this question by considering a computational model that consists of $2n$ target bits together with a set of classical gates controlled by log$(2n+1)$ ancillary qubits. We show that this model is equivalent to a quantum computer operating on $n$ qubits. Furthermore, we show that even a primitive computer that is capable of implementing only SWAP gates, can be lifted to universal quantum computing, if aided with an appropriate quantum control of logarithmic size. Our results thus exemplify the information processing power brought forth by the quantum control system.
description: 11 pages, 4 figures, published version
Scalar-tensor black holes coupled to Born-Infeld nonlinear electrodynamics
Creators: name: Stefanov, Ivan Zh.
name: Yazadjiev, Stoytcho S.
name: Todorov, Michail D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The non-existence of asymptotically flat, neutral black holes and asymptotically flat, charged black holes in the Maxwell electrodynamics, with non-trivial scalar field has been proved for a large class of scalar-tensor theories. The no-scalar-hair theorems, however, do not apply in the case of non-linear electrodynamics. In the present work numerical solutions describing charged black holes coupled to Born-Infeld type non-linear electrodynamics in scalar-tensor theories of gravity with massless scalar field are found. The causal structure and properties of the solutions are studied, and a comparison between these solutions and the corresponding solutions in the General Relativity is made. The presence of the scalar field leads to a much more simple causal structure. The present class of black holes has a single, non-degenerate horizon, i.e., its causal structure resembles that of the Schwarzschild black hole.
description: 12 pages, 4 figures, PRD
Additional file 1 of The impact of interprofessional task-based training on the prevention of surgical site infection in a low-income country
Creators: name: Khan, Muhammad Nasir Ayub
name: Verstegen, Daniëlle M. L.
name: Shahid, Asma
name: Dolmans, Diana H. J. M.
name: van Mook, Walther Nicolaas Anton
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1 Appendix 1. Semi-structured interview guide.
Short-Term Stock Price-Trend Prediction Using Meta-Learning
Creators: name: Chang, Shin-Hung
name: Hsu, Cheng-Wen
name: Li, Hsing-Ying
name: Zeng, Wei-Sheng
name: Ho, Jan-Ming
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Although conventional machine learning algorithms have been widely adopted for stock-price predictions in recent years, the massive volume of specific labeled data required are not always available. In contrast, meta-learning technology uses relatively small amounts of training data, called fast learners. Such methods are beneficial under conditions of limited data availability, which often obtain for trend prediction based on time-series data limited by sparse information. In this study, we consider short-term stock price prediction using a meta-learning framework with several convolutional neural networks, including the temporal convolution network, fully convolutional network, and residual neural network. We propose a sliding time horizon to label stocks according to their predicted price trends, referred to as called slope-detection labeling, using prediction labels including "rise plus," "rise," "fall," and "fall plus". The effectiveness of the proposed meta-learning framework was evaluated by application to the S&P500. The experimental results show that the inclusion of the proposed meta-learning framework significantly improved both regular and balanced prediction accuracy and profitability.
description: \copyright 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works
Additional file 1 of Genotypic variation in root morphology, cotton subtending leaf physiology and fiber quality against nitrogen
Creators: name: ASIF, Iqbal
name: DONG, Qiang
name: WANG, Xiangru
name: GUI, Huiping
name: ZHANG, Hengheng
name: PANG, Nianchang
name: ZHANG, Xiling
name: SONG, Meizhen
Publisher: name: figshare
Year: 2021
Subjects: subject: Biochemistry
subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology

description: Additional file 1. Table S1. List of source and target traits used for correlation network based on correlation coefficient. Table S2. Principal component analysis (PCA) of various morphological, physiological and fiber quality traits of CCRI-69 and XLZ-30 under control (2.5 mmol·L−1) and high (5 mmol·−1) N conditions.
Graphene: A Pseudochiral Fermi Liquid
Creators: name: Polini, Marco
name: Asgari, Reza
name: Barlas, Yafis
name: Pereg-Barnea, T.
name: MacDonald, A. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Doped graphene sheets are pseudochiral two-dimensional Fermi liquids with abnormal electron-electron interaction physics. We address graphene's Fermi liquid properties quantitatively using a microscopic random-phase-approximation theory and comment on the importance of using exchange-correlation potentials based on the properties of a chiral two-dimensional electron gas in density-functional-theory applications to graphene nanostructures.
description: 15 pages, 4 figures, submitted
Probing the nuclear EOS with fragment production
Creators: name: Colonna, M.
name: Rizzo, J.
name: Chomaz, Ph.
name: Di Toro, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We discuss fragmentation mechanisms and isospin transport occurring in central collisions between neutron rich systems at Fermi energies. In particular, isospin effects are analyzed looking at the correlations between fragment isotopic content and kinematical properties. Simulations are based on an approximate solution of the Boltzmann-Langevin (BL) equation. An attempt to solve the complete BL equation, by introducing full fluctuations in phase space is also discussed.
description: 10 pages, 4 figures; Int.Nucl.Phys.Conf., Tokyo June 07, to appear in Nucl.Phys.A (Elsart)
Representative community divisions of networks
Creators: name: Kirkley, Alec
name: Newman, M. E. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Methods for detecting community structure in networks typically aim to identify a single best partition of network nodes into communities, often by optimizing some objective function, but in real-world applications there may be many competitive partitions with objective scores close to the global optimum and one can obtain a more informative picture of the community structure by examining a representative set of such high-scoring partitions than by looking at just the single optimum. However, such a set can be difficult to interpret since its size can easily run to hundreds or thousands of partitions. In this paper we present a method for analyzing large partition sets by dividing them into groups of similar partitions and then identifying an archetypal partition as a representative of each group. The resulting set of archetypal partitions provides a succinct, interpretable summary of the form and variety of community structure in any network. We demonstrate the method on a range of example networks.
description: 15 pages, 4 figures
Phytoplankton dynamics and the distribution of fish larvae and their nutritional resources across an estuarine plume front
Creators: name: Levasseur, Maurice
Publisher: name: University of British Columbia
Year: 2011

description: In the marine environment, export production leading to the traditional food chain is a relatively rare event taking place primarily in hydrographic features such as frontal areas. When export production persists, massive reproduction of herbivores is expected to occur. Since copepod eggs and nauplii are the main prey of a majority of fish postlarvae, the spawning of dominant fish species is expected to be associated with fronts. The aims of this study were to determine the influence of an estuarine plume front upon the phytoplankton dynamics (distribution and physiological status) and to assess the role of the cross-frontal circulation upon the distribution of fish larvae and their prey. The frontal area under study is located in the northwestern part of the Gulf of St. Lawrence, at the interface between a coastal jet (Gaspe Current) flowing along the Gaspe Peninsula and the Anticosti Gyre. In early June, maximum phytoplankton concentrations (up to 35 μg chl a L⁻¹) were found in the Gaspe Current. In the salinity gradient, a significant correlation was found between salinity and phytoplankton concentrations (and seston in general), indicating that physical processes (vertical and horizontal mixing) were more important in controlling the seston distribution than biological processes. The dominance of physical processes is probably due to the high current velocities and shear stress in the Gaspe Current in early June. Later during the season, the cross-frontal mixing was less vigorous due to the lower freshwater runoff, and the front acted as a retention zone for estuarine plankton. Maximum diatom concentrations (up to 50 μg chl a L⁻¹) were measured in the front per se. Measurements of nitrogen and silicate concentrations (ambient and intracellular) and uptake rates suggested that silicate generally limited diatom growth across the front. In June, estuarine larvae (capelin, Mallotus villosus and sand lance, Ammodytes hexapterus) were concentrated in the diatom-rich Gaspe Current and front where immature copepod stages were abundant. The five-fold increase in immature copepod concentrations between the gyre and the current/front resulted probably from a food-induced increase in copepod reproduction. Thus it appears that the dispersion strategy of the estuarine species in relation with local hydrography favours the exploitation of the resource-rich Gaspe current and front by the first-feeding postlarvae. The extrusion of redfish (Sebastes spp.) larvae appears to be synchronized with the copepod reproduction that followed the gyre April/May bloom. Later, redfish larvae were also found in abundance in the resource-rich front.
Some Exact Solutions to Equations of Motion of an Incompressible Third Grade Fluid
Creators: name: Saifullah
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 76M40

description: This investigation deals with some exact solutions of the equations governing the steady plane motions of an incompressible third grade fluid by using complex variables and complex functions. Some of the solutions admit, as particular cases, all the solutions of Moro et al[1].
description: 6 pages, 7 figures
Why Must Primordial Non-Gaussianity Be Very Small?
Creators: name: Kristiano, Jason
name: Yokoyama, Jun'ichi
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: One-loop correction to the power spectrum in generic single-field inflation is calculated by using standard perturbation theory. Because of the enhancement inversely proportional to the observed red tilt of the spectral index of curvature perturbation, the correction turns out to be much larger than previously anticipated. As a result, the primordial non-Gaussianity must be much smaller than the current observational bound in order to warrant the validity of cosmological perturbation theory.
Anderson localization and nonlinearity in one dimensional disordered photonic lattices
Creators: name: Lahini, Yoav
name: Avidan, Assaf
name: Pozzi, Francesca
name: Sorel, Marc
name: Morandotti, Roberto
name: Christodoulides, Demetrios N.
name: Silberberg, Yaron
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We experimentally investigate the evolution of linear and nonlinear waves in a realization of the Anderson model using disordered one dimensional waveguide lattices. Two types of localized eigenmodes, flat-phased and staggered, are directly measured. Nonlinear perturbations enhances localization in one type, and induce delocalization in the other. In a complementary approach, we study the evolution on short time scales of $δ$-like wavepackets in the presence of disorder. A transition from ballistic wavepacket expansion to exponential (Anderson) localization is observed. We find an intermediate regime in which the ballistic and localized components coexist while diffusive dynamics is absent. Evidence is found for a faster transition into localization under nonlinear conditions.
description: 4 pages, 4 figures. Slightly different then the published version. Comments welcome
Playing quantum nonlocal games with six noisy qubits on the cloud
Creators: name: Sheffer, Meron
name: Azses, Daniel
name: Torre, Emanuele G. Dalla
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Nonlocal games are extensions of Bell inequalities, aimed at demonstrating quantum advantage. These games are well suited for noisy quantum computers because they only require the preparation of a shallow circuit, followed by the measurement of non-commuting observable. Here, we consider the minimal implementation of the nonlocal game proposed in Science 362, 308 (2018). We test this game by preparing a 6-qubit cluster state using quantum computers on the cloud by IBM, Ionq, and Honeywell. Our approach includes several levels of optimization, such as circuit identities and error mitigation and allows us to cross the classical threshold and demonstrate quantum advantage in one quantum computer. We conclude by introducing a different inequality that allows us to observe quantum advantage in less accurate quantum computers, at the expense of probing a larger number of circuits.
Measurement of the Fermi Constant by FAST
Creators: name: Barczyk, A.
name: Kirkby, J.
name: Malgeri, L.
name: Berdugo, J.
name: Casaus, J.
name: Mana, C.
name: Marin, J.
name: Martinez, G.
name: Sanchez, E.
name: Willmott, C.
name: Casella, C.
name: Pohl, M.
name: Deiters, K.
name: Dick, P.
name: Petitjean, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: An initial measurement of the lifetime of the positive muon to a precision of 16 parts per million (ppm) has been performed with the FAST detector at the Paul Scherrer Institute. The result is tau_mu = 2.197083 (32) (15) microsec, where the first error is statistical and the second is systematic. The muon lifetime determines the Fermi constant, G_F = 1.166353 (9) x 10^-5 GeV^-2 (8 ppm).
description: 15 pages, 6 figures
Scaphoideus Uhler 1889
Creators: name: Dmitriev, Dmitry
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadellidae
Scaphoideus

description: Genus Scaphoideus Uhler, 1889 Description. Body slender. Crown 1.5 times as long as pronotum, 1.3 times longer than wide, medially almost 2 times as long as next to eye; its anterior margin acuteangled, posterior margin straight. Crown-face transition carinate; acrometope distinct, with remnants of the original anterior carina on dorsum of head. Face about as long as wide; anteclypeus expanded towards apex; 1.7 times as long as wide; lorum as wide as anteclypeus, 2/5 of its inner margin bordered by postclypeus; postclypeus about 2 times as long as wide. Gena evenly convex, slightly incised below eye. Antennae long, extending beyond apices of wing pads. Pronotum 3 times as wide as long, without lateral carina. Forewing pads 1.4 times as long as pterothorax medially. Fore tibia with 4 macrochaetae in dorsal rows and numerous setae in ventral rows. Middle tibia with 4 macrochaetae in all longitudinal rows. Setal formula of hind femur 2+2+1; hind tibia with 8 macrochaetae in dorsal rows and shorter intercalary setae among them: 4–5 in anterodorsal row and 1 in posterodorsal row. Abdomen with 4 longitudinal rows of macrochaetae; tergites VII and VIII with 6 macrochaetae; macrochaetae longer than length of tergites. Pygofer about 2 times as long as preceding tergites. Male gonapophyses triangular, almost 2 times longer than wide, with pointed apices.
description: Published as part of Dmitriev, Dmitry, 2009, Nymphs of some Nearctic leafhoppers (Homoptera, Cicadellidae) with description of a new tribe, pp. 13-33 in ZooKeys 29 (29) on page 19, DOI: 10.3897/zookeys.29.223, http://zenodo.org/record/576572
description: {"references": ["Uhler PR (1889) New genera and species of American Homoptera. Transactions of the Maryland Academy of Sciences 1: 33 - 44."]}
Driven localized excitations in the acoustic spectrum of small nonlinear macroscopic and microscopic lattices
Creators: name: Sato, M.
name: Sievers, A. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Both bright and dark traveling, locked, intrinsic localized modes (ILMs) have been generated with a spatially uniform driver at a frequency in the acoustic spectrum of a nonlinear micromechanical cantilever array. Complementary numerical simulations show that a minimum density of modes, hence array size, is required for the formation of such locked smoothly running excitations. Additional simulations on a small 1-D antiferromagnetic spin system are used to illustrate that such uniformly driven running ILMs should be a generic feature of a nanoscale atomic lattice.
description: Physical Review Letters, accepted
On assimilating sea surface temperature data into an ocean general circulation model
Creators: name: Weaver, Anthony T.
Publisher: name: University of British Columbia
Year: 2010

description: The feasibility of sea surface temperature (SST) data improving the performance of an ocean general circulation model (OGCM) is investigated through a series of idealized numerical experiments. The GFDL Bryan-Cox-Semtner primitive equation model is set-up as an eddy resolving, unforced, flat bottomed channel of uniform depth. 'Observed' SST data taken from a reference ocean established in a control run are continuously assimilated into an 'imperfect' model using a simple 'nudging' scheme based on a surface relaxation condition of the form Q = C(SST — T₁) where Q is the heat flux and T₁ is the temperature at the top level of the model. The rate of assimilation is controlled by adjusting the constant inverse relaxation time parameter C. Numerical experiments indicate that the greatest improvement in the model fields is achieved in the extreme case of infinite assimilation (i.e., C = ᅇ) in which the 'observed' SST is directly inserted into the model. This improvement is quantified by monitoring the reduction in the root mean square (RMS) errors relative to the simulated reference ocean. Assimilation with longer relaxation time-scales (i.e., smaller C's) proves quite ineffective in reducing the RMS errors. The improvement in the direct insertion numerical experiment stems from the model's ability to transfer assimilated SST into subsurface information through strong advective processes. The assimilation of cool surface data induces convective overturning which transfers the 'cool' information downward rapidly but adversely affects the vertical thermal structure by an unrealistic deepening of the mixed layer. By contrast, warm surface data do not penetrate downward readily. Thus, the systematically biased downward flux of coolness gradually produces unrealistically cool subsurface waters.
A Methodology to Formulate User Requirements for Designing Collaborative Robots
Creators: name: Macovetchi
name: Kirstein
name: Doulgeri
name: Dimeas
Publisher: name: Zenodo
Year: 2019

description: In this paper, we are going to present a methodology for gathering user requirements to design industrial collaborative robots. The study takes place within CoLLaboratE, a European project focusing on how industrial

robots learn to cooperate with human workers for performing new manufacturing tasks, considering four use cases. The project follows a User-Centered Design approach by involving end-users in the development process. The user requirements will thus be gathered by applying a mixed methodology, with the purpose of formulating a list of requirements which can be generalized, but also case specific. This methodology is preliminary, and it will be improved during the following months, when the data will be collected and analyzed.
Spectropolarimetric signatures of Earth-like extrasolar planets
Creators: name: Stam, D. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present results of numerical simulations of the flux (irradiance), F, and the degree of polarization (i.e. the ratio of polarized to total flux), P, of light that is reflected by Earth-like extrasolar planets orbiting solar-type stars, as functions of the wavelength (from 0.3 to 1.0 micron, with 0.001 micron spectral resolution) and as functions of the planetary phase angle. We use different surface coverages for our model planets, including vegetation and a Fresnel reflecting ocean, and clear and cloudy atmospheres. Our adding-doubling radiative transfer algorithm, which fully includes multiple scattering and polarization, handles horizontally homogeneous planets only; we simulate fluxes and polarization of horizontally inhomogeneous planets by weighting results for homogeneous planets. Like the flux, F, the degree of polarization, P, of the reflected starlight is shown to depend strongly on the phase angle, on the composition and structure of the planetary atmosphere, on the reflective properties of the underlying surface, and on the wavelength, in particular in wavelength regions with gaseous absorption bands. The sensitivity of P to a planet's physical properties appears to be different than that of F. Combining flux with polarization observations thus makes for a strong tool for characterizing extrasolar planets. The calculated total and polarized fluxes will be made available through the CDS.
description: 31 pages text, 17 figures, 1 table Submitted to A&A
Next-to-leading-order corrections to exclusive processes in $k_T$ factorization
Creators: name: Nandi, Soumitra
name: Li, Hsiang-nan
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate next-to-leading-order (NLO) corrections to exclusive processes in $k_T$ factorization theorem, taking $πγ^*\toγ$ as an example. Partons off-shell by $k_T^2$ are considered in both the quark diagrams from full QCD and the effective diagrams for the pion wave function. The gauge dependences in the above two sets of diagrams cancel, when deriving the $k_T$-dependent hard kernel as their difference. The gauge invariance of the hard kernel is then proven to all orders by induction. The light-cone singularities in the $k_T$-dependent pion wave function are regularized by rotating the Wilson lines away from the light cone. This regularization introduces a factorization-scheme dependence into the hard kernel, which can be minimized in the standard way. Both the large double logarithms $\ln^2k_T$ and $\ln^2 x$, $x$ being a parton momentum fraction, arise from the loop correction to the virtual photon vertex, the former being absorbed into the pion wave function and organized by the $k_T$ resummation, and the latter absorbed into a jet function and organized by the threshold resummation. The NLO corrections are found to be only few-percent for $πγ^*\toγ$, if setting the factorization scale to the momentum transfer from the virtual photon.
description: 13 pages; version to appear in Physical Review D
Negative phase velocity in nonlinear oscillatory systems --mechanism and parameter distributions
Creators: name: Cao, Zhoujian
name: Li, Pengfei
name: Zhang, Hong
name: Hu, Gang
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Waves propagating inwardly to the wave source are called antiwaves which have negative phase velocity. In this paper the phenomenon of negative phase velocity in oscillatory systems is studied on the basis of periodically paced complex Ginzbug-Laundau equation (CGLE). We figure out a clear physical picture on the negative phase velocity of these pacing induced waves. This picture tells us that the competition between the frequency $ω_{out}$ of the pacing induced waves with the natural frequency $ω_{0}$ of the oscillatory medium is the key point responsible for the emergence of negative phase velocity and the corresponding antiwaves. $ω_{out}ω_{0}>0$ and $|ω_{out}|
Native tree species of North-Eastern Poland - Rodzime gatunki drzew Północno-Wschodniej Polski
Creators: name: Kamiński, Wojciech
Publisher: name: Zenodo
Year: 2016
Subjects: native tree species
tree morphology
tree biology
role of tree

description: Niniejsze opracowanie ma na celu zapoznanie czytelnika z podstawowymi wiadomościami na temat głównych rodzajów drzew występujących w regionie północno-wschodniej Polski. To specyfczny obszar naszego kraju, charakteryzujący się surowym klimatem (tu znajduje się "polski biegun zimna"), krótszym niż w innych regionach okresem wegetacyjnym i ubogimi glebami, zbudowanymi głównie z piasku i gliny. W takich oto trudnych warunkach muszą sobie radzić przedstawiciele naszej rodzimej flory drzewiastej. Wszystkich, podstawowych rodzajów drzew jest na naszym terenie zaledwie czternaście i są reprezentowane przez ok. trzydzieści gatunków, wyłączając z tej listy: modrzew europejski (Larix decidua) i cis pospolity (Taxus baccata), których rodzimość pochodzenia
nie została dotychczas jednoznacznie potwierdzona. Do czasu ostatecznej weryfkacji stanowisk naukowych w tej kwestii, autor opracowania zaliczył te gatunki do zadomowionych, czyli takich, które występują w regionie od dawna, dobrze znoszą lokalne warunki siedliskowe, a ponadto nie stanowią zagrożenia dla pozostałych składników lokalnej flory i fauny. W treści opracowania autor opisał dwanaście podstawowych rodzajów drzew występujących na terenie północno-wschodniej Polski, które mają istotne znaczenie ze względu na pełnione funkcje w zadrzewieniach i środowisku leśnym. Pominął dwa: rodzaj czeremcha (Padus), który nie pełni znaczącej roli w lasach i zadrzewieniach oraz rodzaj topola (Populus) – reprezentowany przez liczne gatunki podstawowe i ich mieszańce, mający jednak
ograniczone znaczenie w środowisku leśnym, a występując w zadrzewieniach przydrożnych, budzi w społeczeństwie wiele wątpliwości, co do sposobu i zasadności ich wprowadzania.
Quasiclassical approach and spin-orbit coupling
Creators: name: Gorini, Cosimo
name: Schwab, Peter
name: Dzierzawa, Michael
name: Raimondi, Roberto
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We discuss the quasiclassical Green function method for a two-dimensional electron gas in the presence of spin-orbit coupling, with emphasis on the meaning of the $ξ$-integration procedure. As an application of our approach, we demonstrate how the spin-Hall conductivity, in the presence of spin-flip scattering, can be easily obtained from the spin-density continuity equation.
description: 3 pages, Submitted to Physica E
Gaussian-Basis Monte Carlo Method for Numerical Study on Ground States of Itinerant and Strongly Correlated Electron Systems
Creators: name: Aimi, Takeshi
name: Imada, Masatoshi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We examine Gaussian-basis Monte Carlo method (GBMC) introduced by Corney and Drummond. This method is based on an expansion of the density-matrix operator rho by means of the coherent Gaussian-type operator basis Lambda and does not suffer from the minus sign problem. The original method, however, often fails in reproducing the true ground state and causes systematic errors of calculated physical quantities because the samples are often trapped in some metastable or symmetry broken states. To overcome this difficulty, we combine the quantum-number projection scheme proposed by Assaad, Werner, Corboz, Gull and Troyer in conjunction with the importance sampling of the original GBMC method. This improvement allows us to carry out the importance sampling in the quantum-number-projected phase-space. Some comparisons with the previous quantum-number projection scheme indicate that, in our method, the convergence with the ground state is accelerated, which makes it possible to extend the applicability and widen the range of tractable parameters in the GBMC method. The present scheme offers an efficient practical way of computation for strongly correlated electron systems beyond the range of system sizes, interaction strengths and lattice structures tractable by other computational methods such as the quantum Monte Carlo method.
description: 24 pages, 25 figures
QURG'OQCHILIKKA CHIDAMLILIKNING SHIRIN QALAMPIR (CAPSICUM ANNUUM L.) O'SIMLIGI FIZIOLOGIYASIGA TA'SIRI.
Creators: name: Sh. Rashidov nomidagi Samarqand davlat universiteti Biokimyo instituti O'roqov S.X.,  Usmonova M.F
Publisher: name: Zenodo
Year: 2024

description: Suv tanqisligi stressi butun dunyo bo'ylab o'simliklarning o'sishi va metabolizmiga ta'sir qiluvchi eng muhim ekologik abiotik omillardan biridir. So'nggi paytlarda qishloq xo'jaligida nanomateriallardan foydalanishning rag'batlantiruvchi natijalari qurg'oqchilik stressining o'simliklarga salbiy ta'sirini kamaytirishi ko'rsatildi. Ushbu tadqiqot turli xil uglerod nanomateriallarining suv tanqisligi stressi sharoitida bo'lgan bolgar qalampir o'simliklarining fiziologik, morfologik va biokimyoviy xususiyatlariga ta'sirini o'rganishga qaratilgan. Tadqiqot faktoriy eksperiment sifatida to'liq tasodifiy dizayn yordamida uchta omil kombinatsiyasi bilan uchta takrorlashda amalga oshirildi.
Neutron-Deuteron System and Photon Polarization Parameter at Thermal Neutron Energies
Creators: name: Sadeghi, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Effective Field Theory(EFT) is, the unique, model independent and systematic low-energy version of QCD for processes involving momenta below the pion mass. A low-energy photo-nuclear observable in three-body systems, photon polarization parameter at thermal neutron energies is calculated by using pionless EFT up to next-to-next to leading order(N$^2$LO). In order to make a comparative study of this model, we compared our results for photon polarization parameter with the realistic Argonne $v_{18}$ two-nucleon and Urbana IX or Tucson-Melbourne three-nucleon interactions. Three-body currents give small but significant contributions to some of the observables in the neutron-deuteron radiative capture cross section at thermal neutron energies. In this formalism the three-nucleon forces are needed up to N$^2$LO for cut-off independent results. Our result converges order by order in low energy expansion and also cut-off independent at this order.
description: 10 pages, 3 figures, 2 tables
title: The whole world in their hands
title: an investigation of the influence of mobile technologies on learner
      engagement of primary school children in outdoor settings
titleType: Subtitle
Creators: name: McDowell, Julia
Publisher: name: Lancaster University
Year: 2018

description: This thesis discusses a qualitative investigation into the impact of
      mobile learning interventions designed to promote learner engagement in
      primary-aged children working on science topics in outdoor settings, for
      three cohorts of pupils at a north-of-England primary school.

      Adopting a design-based methodological approach and underpinned by a
      pragmatist epistemological position, the research responds to calls to
      address nature deficit disorder (Louv, 2009), drawing on a theoretical
      framework which combines contemporary learning theories including
      place-based learning (Zimmerman & Land, 2014), contextualised
      learning (Rikala & Kankaanranta , 2014), kinaesthetic learning
      (Pruet et al., 2016), constructionist learning (Papert, 1980; Zimmerman
      & Land, 2014), experiential learning (Lai, Yang, Chen, Ho
      & Chan, 2007), child-centred learning (Dewey, 1938) and
      cross-contextual learning (Nouri, Cerratto-Pargman, Rossitto &
      Ramberg, 2014), with theorisations around learner engagement (Fredricks,
      Blumenfeld & Paris, 2004), flow theory (Csikszentmihalyi, 1997),
      and Digital Capital (Park, 2017).

      Drawing together two research activity streams, a series of mobile
      learning interventions designed for use in outdoor settings were
      developed, evaluated and refined over the course of eight research cycles.
      The discovery-based learning activity stream aimed to encourage learners
      to explore particular themes within an outdoor setting, while the
      production-focused learning stream saw learners generate video-clips and
      eBooks in response to a directed activity. Employing qualitative methods,
      data were collected from a variety of sources, including video-recorded
      observations, semi-structured interviews with teachers, focus groups with
      children and learner-generated digital artefacts, while analysis was
      conducted using thematic analysis and direct interpretation within a
      grounded theory approach (Glaser & Strauss, 1967).

      The thesis concludes that appropriately-designed mobile learning
      interventions in outdoor settings can promote emotional, behavioural and
      cognitive engagement, leading to an immersive state of flow, and can act
      as a bridge between technology and the natural environment, while
      simultaneously addressing the digital disconnect between teachers and
      technology.
THE NECESSITY OF ESTABLISHING RESPONSIBILITY FOR RESISTING A PERSON PERFORMING THE DUTIES OF A GOVERNMENT REPRESENTATIVE OR CIVIL OBLIGATION
Creators: name: Khalikov, Utkir
Publisher: name: Zenodo
Year: 2024

description: In the context of the wide-ranging reforms being implemented in our country, special attention is being paid to ensuring the peaceful and tranquil life of the population, as well as fostering a culture of law obedience and public safety in our society.
Trees outside forests (ToF) for the development of biodiversity - selected legal aspects pertaining to protection of ToF - Rola zadrzewień w kształtowaniu różnorodności biologicznej
Creators: name: Kamiński, Wojciech
Publisher: name: Zenodo
Year: 2016
Subjects: Trees outside forests
the role of trees
tree species selection
trees planting
trees protection
trees requirements

description: Ograniczanie wprowadzania obcych gatunków do przydomowych ogródków, zwiększenie świadomości społeczeństwa na temat roli zadrzewień w życiu człowieka oraz zapewnienie poszanowani prawa w zakresie ich ochrony – takie główne cele przyświecały autorowi niniejszej publikacji podczas licznych szkoleń i spotkań z mieszkańcami Suwałk
i gmin zlokalizowanych na terenie objętym obszarem natura 2000 "Ostoja wigierska", w ramach realizacji projektu pn. "ochrona zadrzewień – promocja rodzimych gatunków drzew północno – wschodniej Polski".
Analiza przeprowadzonych spotkań i szkoleń wyraźnie pokazuje, że problem ze zrozumieniem, jak ważnym elementem środowiska przyrodniczego są śródpolne, przydrożne, czy też osiedlowe zadrzewienia istnieje. analiza ta wskazuje, że mieszkańcy obszarów wiejskich pojmują znaczenie zadrzewień w szerszym kontekście niż tylko ładnie wyglądających
elementów krajobrazu, czy producentów tlenu, jak to ma miejsce w przypadku większości mieszkańców miast. Rozumieją ich potencjał dla zwiększania atrakcyjności turystycznej terenu, cenią za walory użytkowe, lecznicze czy też, a może przede wszystkim za źródło pożytków pszczelich. jednocześnie, ta sama grupa ludności wskazywała na pewne obszary konfliktów, jakie mogą występować na styku zadrzewienie – grunt użytkowany rolniczo.
podnosiła problem konkurencji korzeniowej drzew przydrożnych z roślinami uprawnymi,
czy też ograniczenie przez nie możliwości mechanicznego użytkowania posiadanych gruntów. podczas prowadzonych rozmów autor starał się wyjaśniać, że wskazywane problemy byłyby o tyle zasadne, o ile do ich powstania nie przyczynialiby się sami rolnicy, którzy w wielu przypadkach, podczas prowadzenia prac polowych worywują się w pas drogowy skutecznie likwidując bufor oddzielający zadrzewienie od gruntów rolnych.
Zdecydowanie największy problem sprawiało uczestnikom spotkań i szkoleń zrozumienie przepisów prawa dotyczących ochrony zadrzewień. w wielu przypadkach nie wiedzieli o konieczności uzyskiwania odpowiednich zezwoleń na wycinkę drzew, a jeżeli już mieli na ten temat wiedzę, to nierzadko nie była ona aktualna, a to ze względu na dość
często zmieniające się przepisy w tym zakresie.
Dzięki zrealizowanym działaniom projektu udało się wyjaśnić mieszkańcom wiele wątpliwości dotyczących m.in. roli zadrzewień w krajobrazie miejskim i wiejskim, procedur związanych z usuwaniem drzew z zadrzewień, czy zasad i terminów wprowadzania nasadzeń.