cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Soluble and polymer-bound palladium and platinum complexes of ferrocene derivatives
Creators: name: Han, Nam Fong
Publisher: name: University of British Columbia
Year: 2010

description: The preparation, characterization, and catalytic properties of some soluble and polymer-bound palladium and platinum complexes of ferrocene derivatives are described. Special emphasis has been placed on studies of the mixed "hard-soft" ligands such as PPFA and ISOPFA. [Formula Omitted] The soluble complexes (L-L)MC1₂ (L-L = BPPF, PPFA, ISOPFA, BPPFA; M = Pd, Pt) and [(L-L)PdS₂][C10₄]₂ (L-L = BPPF, PPFA; S = DMF, py) have been characterized by microanalyses, NMR and IR spectroscopic techniques. The cationic palladium(II) complex [(L-L)PdS₂][C10₄]₂ (L-L = PPFA, S = DMF) is an effective catalyst precursor for the hydrogenation of simple olefins at 30°C and 1 atm pressure. The rate of styrene hydrogenation depends on the substrate concentration, catalyst concentration and the solvent. The results are consistent with a homogeneous catalytic system. Platinum(II) complexes (L-L)PtCl₂ (L-L = (S,R)-PPFA, (S,R)-ISOPFA) are effective catalyst precursors for the hydrosilylation of aromatic ketones with Ph₂SiH₂. The complexes with mixed "hard-soft" ligands are better catalyst precursors than those with di(tertiary phosphine) ligands. Under the same conditions the hydrosilylation of ferrocenyl ketones results in further reduction and affords mainly the alkylferrocene products. The stable carbonium ion FcC⁺HCH₃ (Fc = Fe-(C₅H₅)(C₅H₄)-) is reduced by Ph₂SiH₂ to FcCH₂CH₃ in a thermal reaction which is catalyzed by the complex (PPFA)PtCl₂. The reaction of Ph₂SiH₂ with (L-L)PtCl₂ (L-L = PPFA, ISOPFA) yields a stable platinum(IV) hydride, which eliminates Ph₂SiHCl in solution to afford (L-L)PtHCl. The mechanistic implications of these observations are discussed. Polymers functionalized with ferrocene and ferrocene derivatives have been prepared. Mossbauer spectroscopic techniques and microanalyses are used to characterize these polymers and their palladium and platinum complexes. In a number of cases these results are confirmed by the cross-polarization/magic-angle spinning ¹³C NMR spectroscopic technique. The palladium(II) and platinum(II) derivatives of the ferrocenyl-amine and -phosphine containing polymers are effective catalysts for the hydrogenation and hydrosilylation of olefins. All the catalysts can be easily separated from the reaction mixture and can be recycled with no loss of activity. The pronounced effect of the attached ligand in the palladium based polymers indicates that free metal is not involved. However, in the case of platinum based catalysts, it is likely that reduction to platinum metal takes place.
Few-electron semiconductor quantum dots with Gaussian confinement
Creators: name: Gomez, Sergio S.
name: Romero, Rodolfo H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have performed Hartree-Fock calculations of electronic structure of N \le 10 electrons in a quantum dot modeled with a confining Gaussian potential well. We discuss the conditions for the stability of N bound electrons in the system. We show that the most relevant parameter determining the number of bound electrons is $V_0 R^2$. Such a property arises from widely valid scaling properties of the con ning potential. Gaussian Quantum dots having N = 2, 5 and 8 electrons are particularly stable in agreement with Hund rule. The shell structure becomes less and less noticeable as the well radius increases.
description: 14 pages, 4 figures
Emission from Very Small Grains and PAH Molecules in Monte Carlo Radiation Transfer Codes: Application to the Edge-On Disk of Gomez's Hamburger
Creators: name: Wood, Kenneth
name: Whitney, Barbara
name: Robitaille, Thomas
name: Draine, Bruce
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have modeled optical to far infrared images, photometry, and spectroscopy of the object known as Gomez's Hamburger. We reproduce the images and spectrum with an edge-on disk of mass 0.3M_sun and radius 1600AU, surrounding an A0 III star at a distance of 280pc. Our mass estimate is in excellent agreement with recent CO observations. However, our distance determination is more than an order of magnitude smaller than previous analyses which inaccurately interpreted the optical spectrum. To accurately model the infrared spectrum we have extended our Monte Carlo radiation transfer codes to include emission from polycyclic aromatic hydrocarbon (PAH) molecules and very small grains (VSG). We do this using pre-computed PAH/VSG emissivity files for a wide range of values of the mean intensity of the exciting radiation field. When Monte Carlo energy packets are absorbed by PAHs/VSGs we reprocess them to other wavelengths by sampling from the emissivity files, thus simulating the absorption and re-emission process without reproducing lengthy computations of statistical equilibrium, excitation and de-excitation in the complex many level molecules. Using emissivity lookup tables in our Monte Carlo codes gives the flexibility to use the latest grain physics calculations of PAH/VSG emissivity and opacity that are being continually updated in the light of higher resolution infrared spectra. We find our approach gives a good representation of the observed PAH spectrum from the disk of Gomez's Hamburger. Our models also indicate the PAHs/VSGs in the disk have a larger scaleheight than larger radiative equilibrium grains, providing evidence for dust coagulation and settling to the midplane.
description: ApJ accepted
Flavonoids from Artocarpus hirsutus Lam: Synthesis of new prenyl ethers, acetates and their anti-acne activity
Creators: name: Mahadeva Nayak
name: A. Nagarajan
name: Majeed, Muhammed
name: M. Jamsheeda
name: Ambar K. Choudhury
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Science Policy

description: Artocarpus hirsutus Lam., one of the species of Artocarpus, is not well studied. The present study is intended to isolate the chemical constituents present in stem wood extract of A. hirsutus, to synthesize their new derivatives and to evaluate their activity against Propionibacterium acnes. Three major flavonoids, cudraflavone A, cycloartocarpin and artocarpin were isolated from the stem wood extract and cudraflavone A was isolated for the first time from this plant. New prenyl ether and acetate derivatives of isolated flavonoids have been synthesized. This is the first to report on the evaluation of in vitro anti-acne potential of crude extracts, isolated flavonoids and their new synthetic derivatives. The crude extracts (MIC values 2, 4 and 15.6 μg/mL) and the isolated constituents (MIC values 2, 0.5 and 0.25 μg/mL) showed significant in vitro anti-acne activity against P. acnes which was comparable with commercially available anti-acne agent, tea tree, oil and a standard antibiotic, Clindamycin (MIC 0.03 μg/mL) indicating their potential as anti-acne agents.
Design and synthesis of 1,4-benzothiazine derivatives with promising effects against colorectal cancer cells
Creators: name: Rai, Amit
name: Vinit Raj
name: Singh, Ashok K.
name: Keshari, Amit K.
name: Kumar, Umesh
name: Kumar, Dinesh
name: Saha, Sudipta
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Cancer

description: In this study, we designed and synthesized a series of 1,4-benzothiazine and evaluated them for anticancer activity toward HT-29 human colon cancer cells using SRB assay. Before the synthesis, docking studies were performed using various molecular targets of colon cancer including IL-2, IL-6, COX-2, caspase-3, and caspase-8. The molecular dynamic (MD) simulation was also executed to examine the stability of ligand-receptor complex of more stable dock conformation. Further computational study was carried out in order to predict the pharmacokinetic profile of titled compounds. Among 34 tested compounds, compounds AR13 and AR15 were found to be active against HT-29 cells (GI50 . Moreover, Compounds AR5, AR22, and AR34 showed the moderate activity with GI50 −5 kcal/mol for AR13 and AR15 with all the molecular targets and the ligand-protein complex was found stable after its formation. Again, computational analysis revealed that both molecules AR13 and AR15 had good ADMET profiling. These encouraging outcomes allowed us to conclude that both AR13 and AR15 may emerge as lead compounds against colon cancer.
Stability of spinor Fermi gases in tight waveguides
Creators: name: del Campo, A.
name: Muga, J. G.
name: Girardeau, M. D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The two and three-body correlation functions of the ground state of an optically trapped ultracold spin-1/2 Fermi gas (SFG) in a tight waveguide (1D regime) are calculated in the plane of even and odd-wave coupling constants, assuming a 1D attractive zero-range odd-wave interaction induced by a 3D p-wave Feshbach resonance, as well as the usual repulsive zero-range even-wave interaction stemming from 3D s-wave scattering. The calculations are based on the exact mapping from the SFG to a ``Lieb-Liniger-Heisenberg'' model with delta-function repulsions depending on isotropic Heisenberg spin-spin interactions, and indicate that the SFG should be stable against three-body recombination in a large region of the coupling constant plane encompassing parts of both the ferromagnetic and antiferromagnetic phases. However, the limiting case of the fermionic Tonks-Girardeau gas (FTG), a spin-aligned 1D Fermi gas with infinitely attractive p-wave interactions, is unstable in this sense. Effects due to the dipolar interaction and a Zeeman term due to a resonance-generating magnetic field do not lead to shrinkage of the region of stability of the SFG.
description: 5 pages, 6 figures
Phenomenological Landau analysis of predicted magnetoelectric fluorides: KMnFeF$_{6}$ and Ba$_{2}$Ni$_{7}$F$_{18}$
Creators: name: Nénert, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recently, we predicted based on symmetry considerations that KMnFeF$_{6}$ and Ba$_{2}$Ni$_{7}$F$_{18}$ are likely magnetoelectric multiferroic materials. In this contribution, we investigate with Landau theory and crystal structure considerations the polarization and the linear magnetoelectric effect in these materials. Based on these two examples, we show that any magnetoferroelectric will display additional electrical polarization below its magnetic ordering temperature. This additional electrical polarization is not related to the linear magnetoelectric effect. Its magnitude depends on the dielectric susceptibility.
description: 11 pages, accepted for publication in Journal of Physics: Condensed Matter
Fatty acid characteristics of grass pea (Lathyrus sativus) in an East Mediterranean environment
Creators: name: Arslan, Mehmet
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Hematology
subject: Plant Biology

description: Lathyrus sativus L., (grass pea) is an annual plant widely grown as a pulse crop and its dried seeds are harvested and consumed as human food since ancient times. This plant is also commonly grown for animal feed and forage. Grass pea seeds may represent a potential source of several important nutrients for human and animal nutrition. Fatty acid compositions of 173 different grass pea accessions have been studied. Present results indicate that total saturated fatty acids, total monounsaturated fatty acids, total polyunsaturated fatty acids, and total fatty acids ranged from 295.72 to 436.94, 113.19 to 170.78, 127.39 to 179.39, 538.04 to 778.98 mg 100 g−1, respectively. In addition, unsaturated fatty acids, oleic acid, linoleic acid, γ-linolenic acid, and α-linolenic acid that are the main components of fatty acids ranged from 109.22 to 163.95,59.57 to 82.98, 16.18 to 30.38, and 45.56 to 71.59 mg 100 g−1, respectively.
Comment on "Universal effect of excitation dispersion on the heat capacity and gapped states in fluids"
Creators: name: Bryk, T.
name: Jakse, N.
name: Mryglod, I.
name: Ruocco, G.
name: Wax, J. -F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We discuss the validity of recent results in [Phys. Rev. Lett. 125, 125501 (2020)] on an universal relation between the heat capacity and dispersions of collective excitations in liquids.
description: 7 pages, 4 figures
title: Reconstructing an S-box from its Difference Distribution Table
Creators: name: Dunkelman, Orr
name: Huang, Senyang
Publisher: name: Ruhr-Universität Bochum
Year: 2019

description: In this paper we study the problem of recovering a secret S-box from its difference distribution table (DDT). While being an interesting theoretical problem on its own, the ability to recover the S-box from the DDT of a secret S-box can be used in cryptanalytic attacks where the attacker can obtain the DDT (e.g., in Bar-On et al.’s attack on GOST), in supporting theoretical analysis of the properties of difference distribution tables (e.g., in Boura et al.’s work), or in some analysis of S-boxes with unknown design criteria (e.g., in Biryukov and Perrin’s analysis).
We show that using the well established relation between the DDT and the linear approximation table (LAT), one can devise an algorithm different from the straightforward guess-and-determine (GD) algorithm proposed by Boura et al. Moreover, we show how to exploit this relation, and embed the knowledge obtained from it in the GD algorithm. We tested our new algorithm on random S-boxes of different sizes, and for random 14-bit bijective S-boxes, our results outperform the GD attack by several orders of magnitude.
description: IACR Transactions on Symmetric Cryptology, Volume 2019, Issue 2
The time-energy uncertainty relation for quantum events
Creators: name: Fadel, Matteo
name: Maccone, Lorenzo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Textbook quantum mechanics treats time as a classical parameter, and not as a quantum observable with an associated Hermitian operator. For this reason, to make sense of usual time-energy uncertainty relations such as $Δ{t}ΔE\gtrsim\hbar$, the term $Δt$ must be interpreted as a time interval, and not as a time measurement uncertainty due to quantum noise. However, quantum clocks allow for a measurement of the "time at which an event happens" by conditioning the system's evolution on an additional quantum degree of freedom. Within this framework, we derive here two {\em true} uncertainty relations that relate the uncertainty in the quantum measurement of the time at which a quantum event happens on a system to its energy uncertainty.
description: Comments are welcome
Extremal Graph Theory for Metric Dimension and Diameter
Creators: name: Hernando, Carmen
name: Mora, Merce
name: Pelayo, Ignacio M.
name: Seara, Carlos
name: Wood, David R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C12 (distance in graphs), 05C35 (extremal graph theory)

description: A set of vertices $S$ \emph{resolves} a connected graph $G$ if every vertex is uniquely determined by its vector of distances to the vertices in $S$. The \emph{metric dimension} of $G$ is the minimum cardinality of a resolving set of $G$. Let $\mathcal{G}_{β,D}$ be the set of graphs with metric dimension $β$ and diameter $D$. It is well-known that the minimum order of a graph in $\mathcal{G}_{β,D}$ is exactly $β+D$. The first contribution of this paper is to characterise the graphs in $\mathcal{G}_{β,D}$ with order $β+D$ for all values of $β$ and $D$. Such a characterisation was previously only known for $D\leq2$ or $β\leq1$. The second contribution is to determine the maximum order of a graph in $\mathcal{G}_{β,D}$ for all values of $D$ and $β$. Only a weak upper bound was previously known.
Agree to disagree: Processing default agreement in dative subject constructions in Tamil
Creators: name: Muralikrishnan, R.
name: Bornkessel-Schlesewsky, Ina
Publisher: name: Zenodo
Year: 2011
Subjects: EEG
Auditory ERP study
Tamil
Dative-subjects
Default Agreement

description: Muralikrishnan & Bornkessel-Schlesewsky (2011). Poster presented at the 10th International Symposium of Psycholinguistics, BCBL, Donostia San Sebastian, Spain.
Modelado de relés de distancia en ATP-EMTP - Parte 1.pdf
Creators: name: Guaman Medina, Ruben
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 400805
subject: Electrical energy transmission, networks and systems

description: El trabajo completo presenta el modelado de un relé de distancia genérico en el ambiente de transitorio electromagnético (EMT), haciendo uso de las facilidades que ofrece el ATP-EMTP. Se modeló un relé de distancia genérico de característica mho integrado al motor solucionador de ATP. Los resultados de simulación del sistema de potencia y del relé no requieren ser procesados de forma separada para analizar la operación del relé. El modelo es probado en un sistema reducido de ENDE Transmisión (ETR) en torno a un banco de compensación serie. En este artículo se presenta la primera parte del trabajo, con los fundamentos utilizados para modelar la unidad mho auto polarizada del modelo. El trabajo es la tesis de maestría del autor
A modification of Einstein-Schrodinger theory that contains Einstein-Maxwell-Yang-Mills theory
Creators: name: Shifflett, J. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Lambda-renormalized Einstein-Schrodinger theory is a modification of the original Einstein-Schrodinger theory in which a cosmological constant term is added to the Lagrangian, and it has been shown to closely approximate Einstein-Maxwell theory. Here we generalize this theory to non-Abelian fields by letting the fields be composed of dxd Hermitian matrices. The resulting theory incorporates the U(1) and SU(d) gauge terms of Einstein-Maxwell-Yang-Mills theory, and is invariant under U(1) and SU(d) gauge transformations. The special case where symmetric fields are multiples of the identity matrix closely approximates Einstein-Maxwell-Yang-Mills theory in that the extra terms in the field equations are 10^-13 of the usual terms for worst-case fields accessible to measurement. The theory contains a symmetric metric and Hermitian vector potential, and is easily coupled to the additional fields of Weinberg-Salam theory or flipped SU(5) GUT theory. We also consider the case where symmetric fields have small traceless parts, and show how this suggests a possible dark matter candidate.
description: latex2e, generalized from U(1)xSU(2) to U(1)xSU(d)
QBism and Relational Quantum Mechanics compared
Creators: name: Pienaar, Jacques L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Physical sciences

description: The subjective Bayesian interpretation of quantum mechanics (QBism) and Rovelli's relational interpretation of quantum mechanics (RQM) are both notable for embracing the radical idea that measurement outcomes correspond to events whose occurrence (or not) is relative to an observer. Here we provide a detailed study of their similarities and especially their differences.
description: 11 pages; Companion paper to arXiv:2107.00670
TabLeX: A Benchmark Dataset for Structure and Content Information Extraction from Scientific Tables
Creators: name: Desai, Harsh
name: Kayal, Pratik
name: Singh, Mayank
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Information Extraction (IE) from the tables present in scientific articles is challenging due to complicated tabular representations and complex embedded text. This paper presents TabLeX, a large-scale benchmark dataset comprising table images generated from scientific articles. TabLeX consists of two subsets, one for table structure extraction and the other for table content extraction. Each table image is accompanied by its corresponding LATEX source code. To facilitate the development of robust table IE tools, TabLeX contains images in different aspect ratios and in a variety of fonts. Our analysis sheds light on the shortcomings of current state-of-the-art table extraction models and shows that they fail on even simple table images. Towards the end, we experiment with a transformer-based existing baseline to report performance scores. In contrast to the static benchmarks, we plan to augment this dataset with more complex and diverse tables at regular intervals.
Ejection of Supermassive Black Holes from Galaxy Cores
Creators: name: Gualandris, Alessia
name: Merritt, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: [Abridged] Recent numerical relativity simulations have shown that the emission of gravitational waves during the merger of two supermassive black holes (SMBHs) delivers a kick to the final hole, with a magnitude as large as 4000 km/s. We study the motion of SMBHs ejected from galaxy cores by such kicks and the effects on the stellar distribution using high-accuracy direct N-body simulations. Following the kick, the motion of the SMBH exhibits three distinct phases. (1) The SMBH oscillates with decreasing amplitude, losing energy via dynamical friction each time it passes through the core. Chandrasekhar's theory accurately reproduces the motion of the SMBH in this regime if 2 < ln Lambda < 3 and if the changing core density is taken into account. (2) When the amplitude of the motion has fallen to roughly the core radius, the SMBH and core begin to exhibit oscillations about their common center of mass. These oscillations decay with a time constant that is at least 10 times longer than would be predicted by naive application of the dynamical friction formula. (3) Eventually, the SMBH reaches thermal equilibrium with the stars. We estimate the time for the SMBH's oscillations to damp to the Brownian level in real galaxies and infer times as long as 1 Gyr in the brightest galaxies. Ejection of SMBHs also results in a lowered density of stars near the galaxy center; mass deficits as large as five times the SMBH mass are produced for kick velocities near the escape velocity. We compare the N-body density profiles with luminosity profiles of early-type galaxies in Virgo and show that even the largest observed cores can be reproduced by the kicks, without the need to postulate hypermassive binary SMBHs. Implications for displaced AGNs and helical radio structures are discussed.
description: 18 pages, The Astrophysical Journal, in press. Replaced with revised version
Pyrazolyl ligands in mixed metal complexes
Creators: name: Onyiriuka, Emmanuel C.
Publisher: name: University of British Columbia
Year: 2010

description: The anions LMo(CO)₃⁻ (L = MeGapz₃ or MeGa(3,5-Me₂pz)₃) have been isolated as the Na⁺, Et₄N⁺ or HAsPh₃⁺ salts and the solution structures of the Na⁺ salts in THF have been defined by analysis of the v[sub CO] ir spectra. Ion-pair interaction of the LMo(CO)₃⁻ anion with Na⁺cation in THF solution is apparent from the spectroscopic evidence obtained. The MeGapz₃Mo(CO)₃ ⁻anion reacted with HCl or EtBr to give the seven-coordinate [MeGapz₃]-Mo(CO)₃R (R = H or Et) complexes. However, with Mel or PhCOCl complexes of the type [MeGapz₃]Mo(CO)₂(n₂-COR) (R = Me or Ph) were obtained. The reactions of the LMo(CO)₃⁻ ions (L = MeGapz₃ HBpz₃ or Me₂Gapz(0-CH₂CH₂NMe₂)) with a variety of transition metal halide species have yielded complexes with transition metal-transition metal bonds. The X-ray crystal structures of two such complexes [MeGapz₃]Mo(CO)₃Cu(PPh₃) and [MeGapz₃]Mo-(CO)₃Rh(PPh₃)₂ have been determined. The former complex provides a rare example of a 3:3:1, or capped octahedral structure, with a short (mean) Mo-Cu distance of 2.513(9)Å. The latter compound displays one terminal and two bridging CO ligands and a Mo-Rh distance of 2.6066(5)Å. Transition metal-group 14 (Si, Ge or Sn) element bonded complexes of the type [MeGapz₃]Mo(CO) ₃M'Y (Y = Me₃ or Ph₃, M' = Ge or Sn; Y = Me₃, M' = Si; Y = Me₂Cl, M' = Sn) have been prepared from the reaction of the MeGapz₃Mo(CO)₃anion with the appropriate organo-group 14 chloride. In all the complexes, direct Mo-M' (M' = Si, Ge or Sn) single bonds are featured. The [MeGapz₃]Mo(CO) ₃SnMe₂Cl complex shows an interesting solution behaviour in which a transition from a 3:4, or piano stool structure, to a 3:3:1, or capped octahedral arrangement, is thought to occur. The 3:3:1 structure has been demonstrated in the solid state for the [MeGapz₃]Mo(CO)₃SnPh₃ compound by means of a crystal structure determination. The 'Mo-SnPh₃' and the 'Mo-Cu' compounds discussed in this work are the first examples of such complexes incorporating either the MeGapz₃⁻, HBpz₃⁻ or C₅H₅⁻ ligands in which the 3:3:1 arrangement has been demonstrated unequivocally. The novel tridentate unsymmetric ligands Me₂GapzO(C₅H₃N)CH₂NMe₂⁻ (L[sub a]⁻) and Me₂GapzO(C₉H₆N)⁻ (L[sub q]⁻) have been prepared and numerous transition metal compounds containing these ligands synthesized. The compounds L[sub a] M(CO)₃(M = Mn or Re) are the first examples of transition metal carbonyl complexes in which both the fac and mer arrangements of the unsymmetric ligand about the central metal have been found to co-exist in solution. The square planar rhodium(I) complex, L[sub q]Rh(CO) has been shown to add Mel oxidatively, followed by facile methyl migration reaction to produce the five-coordinate Rh(III) acetyl derivative, L[sub q]Rh(COMe)I. In contrast, the reaction of L[sub a]Rh(CO) with Mel, led to the six-coordinate Rh(III) oxidative addition product, L[sub a]Rh(Me)(I)CO.
Imaging Flux Vortices in Type II Superconductors with a Commercial Transmission Electron Microscope
Creators: name: Loudon, J. C.
name: Midgley, P. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Flux vortices in superconductors can be imaged using transmission electron microscopy because the electron beam is deflected by the magnetic flux associated with the vortices. This technique has a better spatial and temporal resolution than many other imaging techniques and is sensitive to the magnetic flux density within each vortex not simply the fields at the sample surface. Despite these advantages, only two groups have successfully employed the technique using specially adapted instruments. Here we demonstrate that vortices can be imaged with a modern, commercial transmission electron microscope operating at 300 kV equipped with a field emission gun, Lorentz lens and a liquid helium cooled sample holder. We introduce superconductivity for non-specialists and discuss techniques for simulating and optimising images of flux vortices. Sample preparation is discussed in detail as the requirement for samples with very large (>10um), flat areas so that the image is not dominated by diffraction contrast is the main difficulty with the technique. We have imaged vortices in superconducting Bi2Sr2CaCu2O8+d and use correlation functions to investigate the ordered arrangements they adopt as a function of applied magnetic field.
description: 71 pages, 40 figures, now published in Ultramicroscopy. A square root sign in the appendix has been corrected and minus signs have been added to the magnetic phase shift in equations 38 and 69-71 for consistency with the rest of the paper
Dynamic Spacetime Generation: A Computation-Based Frame Universe Model
Creators: name: Yoo, June
Publisher: name: Zenodo
Year: 2025

description: This proposal introduces a novel theoretical perspective called Dynamic Spacetime Generation Theory, which reconceptualizes spacetime not as a static background, but as a flow of discrete "frames" dynamically generated through computational processing. In this model, the gravitational level (G-level) is interpreted as a measure of local informational density or computational load, which modulates the rate of spacetime frame generation.This framework opens new conceptual pathways for understanding phenomena such as gravitational time dilation, spatial distortion, and cosmic acceleration, without requiring additional constructs like dark energy. While the model remains in a pre-formal stage, it aims to inspire further theoretical development and dialogue, particularly regarding its integration with general relativity, cosmology, and information-based physics.

This document was prepared with the assistance of ChatGPT for linguistic support and conceptual clarification. The overall scientific direction and interpretations remain the responsibility of the author.
On the spectral theory and dispersive estimates for a discrete Schrödinger equation in one dimension
Creators: name: Pelinovsky, D. E.
name: Stefanov, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Based on the recent work \cite{KKK} for compact potentials, we develop the spectral theory for the one-dimensional discrete Schrödinger operator $$ H ϕ= (-\De + V)ϕ=-(ϕ_{n+1} + ϕ_{n-1} - 2 ϕ_n) + V_n ϕ_n. $$ We show that under appropriate decay conditions on the general potential (and a non-resonance condition at the spectral edges), the spectrum of $H$ consists of finitely many eigenvalues of finite multiplicities and the essential (absolutely continuous) spectrum, while the resolvent satisfies the limiting absorption principle and the Puiseux expansions near the edges. These properties imply the dispersive estimates $$ \|e^{i t H} P_{\rm a.c.}(H)\|_{l^2_σ \to l^2_{-σ}} \lesssim t^{-3/2} $$ for any fixed $σ> {5/2}$ and any $t > 0$, where $P_{\rm a.c.}(H)$ denotes the spectral projection to the absolutely continuous spectrum of $H$. In addition, based on the scattering theory for the discrete Jost solutions and the previous results in \cite{SK}, we find new dispersive estimates $$ \|e^{i t H} P_{\rm a.c.}(H) \|_{l^1\to l^\infty}\lesssim t^{-1/3}. $$ These estimates are sharp for the discrete Schrödinger operators even for $V = 0$.
Design and synthesis of 1,4-benzothiazine derivatives with promising effects against colorectal cancer cells
Creators: name: Rai, Amit
name: Vinit Raj
name: Singh, Ashok K.
name: Keshari, Amit K.
name: Kumar, Umesh
name: Kumar, Dinesh
name: Saha, Sudipta
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biophysics
subject: Biochemistry
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Cancer

description: In this study, we designed and synthesized a series of 1,4-benzothiazine and evaluated them for anticancer activity toward HT-29 human colon cancer cells using SRB assay. Before the synthesis, docking studies were performed using various molecular targets of colon cancer including IL-2, IL-6, COX-2, caspase-3, and caspase-8. The molecular dynamic (MD) simulation was also executed to examine the stability of ligand-receptor complex of more stable dock conformation. Further computational study was carried out in order to predict the pharmacokinetic profile of titled compounds. Among 34 tested compounds, compounds AR13 and AR15 were found to be active against HT-29 cells (GI50 . Moreover, Compounds AR5, AR22, and AR34 showed the moderate activity with GI50 −5 kcal/mol for AR13 and AR15 with all the molecular targets and the ligand-protein complex was found stable after its formation. Again, computational analysis revealed that both molecules AR13 and AR15 had good ADMET profiling. These encouraging outcomes allowed us to conclude that both AR13 and AR15 may emerge as lead compounds against colon cancer.
Dominance of many-body effects over one-electron mechanism for band structure doping dependence in Nd$_{2-x}$Ce$_x$CuO$_4$: LDA+GTB approach
Creators: name: Korshunov, M. M.
name: Gavrichkov, V. A.
name: Ovchinnikov, S. G.
name: Nekrasov, I. A.
name: Kokorina, E. E.
name: Pchelkina, Z. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In the present work we report the band structure calculations for the high temperature superconductor Nd$_{2-x}$Ce$_x$CuO$_4$ in the regime of strong electronic correlations within an LDA+GTB method, which combines the local density approximation (LDA) and the generalized tight-binding method (GTB). The two mechanisms of band structure doping dependence were taken into account. Namely, the one-electron mechanism provided by the doping dependence of the crystal structure, and the many-body mechanism provided by the strong renormalization of the fermionic quasiparticles due to the large on-site Coulomb repulsion. We have shown that in the antiferromagnetic and in the strongly correlated paramagnetic phases of the underdoped cuprates the main contribution to the doping evolution of band structure and Fermi surface comes from the many-body mechanism.
description: 15 pages, 4 figures, new references and their discussion added, figures updated
Flavonoids from Artocarpus hirsutus Lam: synthesis of new prenyl ethers, acetates and their anti-acne activity
Creators: name: Mahadeva Nayak
name: Nagarajan, A.
name: Majeed, Muhammed
name: Jamsheeda, M.
name: Ambar K. Choudhury
Publisher: name: Taylor & Francis
Year: 2017
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Science Policy

description: Artocarpus hirsutus Lam., one of the species of Artocarpus, is not well studied. The present study is intended to isolate the chemical constituents present in stem wood extract of Artocarpus hirsutus, the synthesis of their new derivatives and to evaluate their activity against Propionibacterium acnes. Three major flavonoids, cudraflavone A, cycloartocarpin and artocarpin were isolated from the stem wood extract and cudraflavone A was isolated for the first time from this plant. New prenyl ether and acetate derivatives of isolated flavonoids have been synthesized. This is the first to report on the evaluation of in vitro anti-acne potential of crude extracts, isolated flavonoids and their new synthetic derivatives. The crude extracts (MIC values 2 μg/mL; 4 μg/mL and 15.6 μg/mL) and the isolated constituents (MIC values 2 μg/mL; 0.5 μg/mL and 0.25 μg/mL) showed significant in vitro anti-acne activity against P. acnes which was comparable with commercially available anti-acne agent tea tree oil and a standard antibiotic, Clindamycin (MIC 0.03 μg/mL) indicating their potential as anti-acne agents.
Design of a mode converter for efficient light-atom coupling in free space
Creators: name: Sondermann, M.
name: Maiwald, R.
name: Konermann, H.
name: Lindlein, N.
name: Peschel, U.
name: Leuchs, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this article, we describe how to develop a mode converter that transforms a plane electromagnetic wave into an inward moving dipole wave. The latter one is intended to bring a single atom or ion from its ground state to its excited state by absorption of a single photon wave packet with near-100% efficiency.
description: RevTex4, 3 figures, revised version, accepted for publication at Appl. Phys. B
Il vuoto e la bellezza. La ricezione della poesia giapponese nella cultura occidentale
Creators: name: Sica, Giorgio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2009

description: Questo lavoro costituisce un tentativo di ricostruire il complesso fenomeno della ricezione della poesia giapponese nella cultura occidentale, avvenuta nei primi decenni dello scorso secolo. Nella parte introduttiva ho descritto le caratteristiche principali della poesia nipponica e dei raffinati codici estetici ad essa sottesi, cercando di sottolineare i punti che maggiormente affascinarono poeti e letterati occidentali che entrarono in contatto con essa. Nella prima parte del lavoro ho illustrato le fondamentali acquisizioni di tecniche e tematiche derivate dalla pittura e dalle arti decorative giapponesi, avvenute in Europa e negli Stati Uniti a partire dalla seconda meta del secolo XIX. Tale fenomeno, passato alla storia con il nome di “giapponismo”, segnò un decisivo sviluppo delle arti figurative e decorative europeo, coinvolgendo alcuni dei maggiori artisti dell’epoca. Esso suscitò, inoltre, un notevole interesse per il mondo del Sol Levante in scrittori di primo piano (tra gli altri, ne ho esaminato effetti nell'evoluzione dell'opera dei fratelli de Goncourt, Gautier, Wilde, D’Annunzio e Govoni) e costituisce perciò, a mio avviso, un precedente ineludibile per quanti vogliano correttamente accostarsi alla successiva ricezione della poesia giapponese in Occidente. A quest’ultimo fenomeno è dedicata la seconda parte della tesi, nella quale ho analizzato la diffusione della poesia giapponese, e in particolare dell’haiku e del tanka, nei contesti culturali americano, italiano e francese, prendendo in esame, tra gli altri, la produzione poetica di Mallarmé, Éluard, Claudel, Rilke, Pound, Stevens, Cummings, Ungaretti, Saba e Penna.
Magnetoresistance and Scaling Laws in Type-II Weyl Semimetal WP_2
Creators: name: Nagpal, V.
name: Jat, K. S.
name: Patnaik, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Topological materials with extremely large magnetoresistance exhibit a prognostic feature of resistivity turn-on behaviour. This occurs when the temperature dependence of resistivity changes from metallic to semiconducting characteristics on application of external magnetic field above a threshold value. Here, we study the magneto-transport properties of type-II Weyl Semimetal WP2. We find that semi-classical theories of magnetoresistance are consistent with our data without the need to invoke topological surface states. Our findings in this work provides an alternative basis to understand the temperature dependence of magnetoresistance in topological materials.
Chitosan modification : toward the rational tailoring of properties
Creators: name: Holme, Kevin R.
Publisher: name: University of British Columbia
Year: 2010

description: The main objective of this work was to develop a method whereby chitosan could be modified to give synthetic analogues of branched polysaccharides. To this end, a variety of allyl glycosides were prepared (99-102, 105, 108,109 and 111) and reductively ozonolyzed, to give the acetaldehydo glycosides 112-119. These aldehydes were then reductively alkylated to chitosan (1), to give branched chitosan derivatives (120-127) of the general structure 157. Pendant residues of α and β-glucopyranose, α and β-D-galactopyranose, 2-acetamido-2-deoxy-D-α and β-glucopyranose, glucopyranuronic acid and β-D-lactose were incorporated by this method, at various levels of substitution. Rheological evaluations of these derivatives by steady-shear viscometry demonstrated a relationship between the degree of substitution and rheological properties, as well as the effect of branch size and functionality on aqueous solution properties. Importantly, many of the trends seen in this study are similar to established explanations for the aqueous solution properties of seed galactomannans. It was also shown that intrinsic viscosities of the derivatives were supportive of observations based on concentrated solution properties. Also, it was demonstrated that these water soluble chitosan derivatives interacted, sometimes in a synergistic manner, with xanthan gum solutions. A similar route, involving the synthesis of 10-undece- nyl-β-D-glycopyranosides (134-136), reductive ozonolysis and reductive amination to chitosan, provided combined hydrophobic/hydrophilic branched chitosan derivatives (140-142) of the general structure 158. This methodology was demonstrated with the 10-undecenyl β-D-glycosides of glucopyranose, gal-actopyranose and lactose. Compounds 140a and 141a. bearing glucose and galactose pendant residues, showed uncommon thermally induced gelation properties in dilute aqueous acid solution. This property was studied by ¹H-nmr relaxation measurements and ¹³C-nmr spectroscopy. It was found that a high degree of substitution was necessary for gel formation, and that the pendant sugar was required, but excess hydrophilicity (such as the disaccharide branch, lactose) precluded gelation. In addition, a derivative (151) was prepared, which contained a metal-chelating moiety and a hydrophilic spacer group. This compound had substantial copper (II) binding capacity, and useful ion-exchange ability. Finally, a chitosan derivative (156) was synthesized, bearing a pendant 1-thio-β-D-glucopyranose moiety, and was shown to be useful for the affinity chromatographic purification of the enzyme β-glucosidase. [Formula Omitted]
Frank Cartwright
Creators: name: (:Unas)
Publisher: name: Unknown
Year: 1870
Subjects: East Hampton
Photographs
Cabinet photographs
Portrait photographs
Portraits
Men

description: This image shows a portrait of Frank Cartwright in a bowtie. This photograph is part of a collection of photographs found in the ceiling of 140A Main Street, now 138, in East Hampton in 1970. This collection was donated by Joan Osborne in April 1995.
title: Developing a fundamental understanding of how oil impacts diagenesis and the effect in transport properties by investigating rock samples from close to the oil-water contact, Ben Nevis formation, Hebron field
Creators: name: Mujica, Francis
Publisher: name: Memorial University of Newofundland
Year: 2019

description: There is ongoing debate as to whether or not oil emplacement in a reservoir rock impedes or stops diagenetic process. The Ben Nevis reservoir in the Hebron Field, offshore Newfoundland has a short transition zone and a clearly identified oil-water contact (OWC). Rock samples from above and below the OWC were used to analyse the role of oil emplacement in the diagenetic processes, with the main focus on quartz overgrowth and its impact on transport properties. The main contributions of this work is that we challenge the debate on whether or not oil emplacement impacts diagenesis for the Hebron Field, a relatively shallow, low temperature reservoir (< 2 km depth, 50-70 °C) using pore size distribution instead of a singular porosity value, and digital rock analysis for the transport properties. Core analysis includes scanning electron microscopy, mineral liberation analysis, cathode-luminescence, mercury injection capillary pressure (MICP), microcomputed tomography scans, and digital rock analysis and simulations. Our results suggest that quartz cement tends to be more abundant towards the water leg. This observation is in agreement with the “oil emplacement retards diagenesis” theory discussed in the literature. Despite differences in quartz overgrowth, the pore size distributions (MICP results) and digital rock images do not reveal any significant differences in the pore structures above and below the OWC. This could indicate that the differences in quartz overgrowth is not substantial enough to cause a significant reduction of the pore size, and thereby impact transport properties.
La riflessività del diritto tra sistemi autopoietici e bisogni individuali
Creators: name: Scamardella, Francesca
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2009

description: Questo lavoro nasce da un interrogativo: perché in una società complessa come quella contemporanea, caratterizzata dalla crescita dei sistemi sociali, dall’aumento della conflittualità, dal prevalere delle relazioni virtuali su quelle reali e dalla liberalizzazione dei mercati si assiste ad un’instabilità del diritto che si traduce in atteggiamenti, sempre più diffusi, a livello personale e collettivo, di disobbedienza e di violazione delle norme che minano la certezza stessa del diritto? L'approccio scelto per tentare di fornire una risposta adeguata è quello di Gunther Teubner fondato sul "diritto riflessivo" che viene inteso dal filosofo tedesco come un diritto che, fungendo da cornice regolativa, si limita a predisporre meccanismi che consentano la comunicazione e l’organizzazione tra i vai sistemi in condizione di reciprocità, senza intervenire eccessivamente e direttamente. Ciò significa che, in ultima analisi, la regola giuridica deriverà non da un intervento regolativo diretto, bensì da questa capacità riflessiva sistemica, ovvero dalla ricezione delle irritazioni e perturbazioni che avvengono tra i vari sistemi sociali. Tuttavia, per quanto innovativa sia l’idea di Gunther Teubner,trova un suo limite nell’incapacità del sociologo tedesco di applicare l’idea della riflessività del diritto anche ai singoli individui. L'idea di fondo che provo a sviluppare in questo progetto è l'applicabilità della categoria del diritto riflessivo agli individui ed, in secondo luogo, al rapporto tra individuo e diritto.