cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
ULTRASOUND-GUIDED CENTRAL LINE INSERTION IN CHILDREN: HOW MUCH IMAGING IS REALLY NEEDED?
Creators: name: Vasconcelos-Castro, Sofia
name: Flor-De-Lima, Beatriz
name: Soares-Oliveira, Miguel
Publisher: name: Portuguese Journal of Cardiac Thoracic and Vascular Surgery
Year: 2022

description: Introduction: A recent survey revealed that most pediatric surgeons use intraoperative fluoroscopy and routine postoperative chest radiography for catheter tip location in central line placement. The aim of this study is to review all cases of ultrasound-guided central line placements and to evaluate the role of postoperative chest radiography. Methods: Retrospective data analysis of children submitted to percutaneous central line insertion under ultrasound control over a 2-year period in a pediatric surgery department. Data collected included: age, indication for central venous access, catheter type, usage of intraoperative fluoroscopy and postoperative chest radiography, complications, and whether chest radiography dictated any catheter-related intervention. Results: Fifty-five long-term central lines were successfully established in children aged between 1 month and 17 years. All patients had the catheter tip position confirmed either by intraoperative fluoroscopy (96%), chest radiography (85%) or both (82%). Catheter tip overlying the cardiac silhouette (right atrium) on chest radiography was reported in 4 cases; these findings led to no change in catheter positioning or other catheter-related intervention. There were no catheter-related complications. Conclusions: Percutaneous central line insertion under US-control is safe and effective even in small children. Post- operative chest radiography did not dictate any modification of catheter tip positioning after central line placement with ultrasound and fluoroscopic control or identified any other complication, thus should not be used routinely.
description: Portuguese Journal of Cardiac Thoracic and Vascular Surgery, Vol. 28 No. 4 (2021): October - December
Pressure induced topological quantum phase transition in Weyl semimetal T_d-MoTe_2
Creators: name: Guguchia, Z.
name: Santos, A. M. dos
name: von Rohr, F. O.
name: Molaison, J. J.
name: Banerjee, S.
name: Rhodes, D.
name: Yin, J. -X.
name: Khasanov, R.
name: Hone, J.
name: Uemura, Y. J.
name: Hasan, M. -Z.
name: Luetkens, H.
name: Bozin, E. S.
name: Amato, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report the pressure (p_max = 1.5 GPa) evolution of the crystal structure of the Weyl semimetal T_d-MoTe_2 by means of neutron diffraction experiments. We find that the fundamental non-centrosymmetric structure T_d is fully suppressed and transforms into a centrosymmertic 1T' structure at a critical pressure of p_cr = 1.2 GPa. This is strong evidence for a pressure induced quantum phase transition (QPT) between topological to a trivial electronic state. Although the topological QPT has strong effect on magnetoresistance, it is interesting that the superconducting critical temperature T_c, the superfluid density, and the SC gap all change smoothly and continuously across p_cr and no sudden effects are seen concomitantly with the suppression of the T_d structure. This implies that the T_c, and thus the SC pairing strength, is unaffected by the topological QPT. However, the QPT requires the change in the SC gap symmetry from non-trivial s+- to a trivial s++ state, which we discuss in this work. Our systematic characterizations of the structure and superconducting properties associated with the topological QPT provide deep insight into the pressure induced phase diagram in this topological quantum material.
description: 9 pages, 4 figures
LUNG RESECTION FOR NON-SMALL-CELL LUNG CANCER - A NEW RISK SCORE TO PREDICT MAJOR PERIOPERATIVE COMPLICATIONS
Creators: name: Veiga Oliveira, Paulo
name: Cabral, Daniel
name: Antunes, Mariana
name: Torres, Carolina
name: Alvoeiro, Magda
name: Rodrigues, Cristina
name: Sousa-Uva, Miguel
name: Félix, Francisco
Publisher: name: Portuguese Journal of Cardiac Thoracic and Vascular Surgery
Year: 2022

description: Objectives: Identify risk factors for major perioperative complications (MPC) after anatomical lung resection for NonSmall-Cell Lung Cancer (NSCLC) and establish a scoring system. Methods: Single center retrospective study of all consecutive patients diagnosed with NSCLC submitted to anatomical lung resection from 2015 to 2019 (N=564). Exclusion criteria: previous lung surgery, concomitant non-lung cancer related procedures, urgency surgery. Study population: 520 patients. Primary end-point: MPC defined as a composite endpoint including at least one of the in-hospital complications. Univariable and Multivariable analyses were developed to identify predictors of perioperative complications and create a risk score. Discrimination was assessed using the C-statistic. Calibration was evaluated by Hosmer and Lemeshow test and internal validation was obtained by means of bootstrap replication. Results: Mean age of 65 years and 327 (62.9%) were males. Mean hospital stay of 9 days after surgery. Overall MPC rate was 23.3%. Male gender, hypertension, FEV1<75%, thoracotomy, bilobectomy/pneumectomy and additional resection were independent predictors of MPC. A risk score based on the odds ratios was developed - Major Perioperative Complications of Lung Resection (MPCLR) scoring system - and ranged between 0 and 14 points. It was divided in 5 groups: 1-2 points (positive preditive value 15%); 3-4 (PPV 25%); 5-7 (PPV 35%); 8-9 (PPV 60%); >10 points (PPV 88%). The score showed rea- sonable discrimination (C-statistic=0.70), good calibration (P=.643) and it was internally validated (C-statistic=0,70 BCa95% CI,0.65-0.79). Conclusions: This study proposes a simple and daily-life risk score system that was able to predict the incidence of perioperative complications.
description: Portuguese Journal of Cardiac Thoracic and Vascular Surgery, Vol. 28 No. 4 (2021): October - December
LYMPH NODE UPSTAGING AFTER SURGERY IN PATIENTS WITH NEGATIVE MEDIASTINAL STAGING BY EBUS
Creators: name: Cabral, Daniel
name: Rodrigues, Cristina
name: Antunes, Mariana
name: Nawojowska, Agata
name: Calado, Telma
name: Torres, Carolina
name: Alvoeiro, Magda
name: Mendes, Samuel
name: Félix, Francisco
Publisher: name: Portuguese Journal of Cardiac Thoracic and Vascular Surgery
Year: 2022

description: Introduction: Mediastinal staging is a hot topic in thoracic oncology. According to the guidelines, and besides other criteria, in the presence of a primary lung cancer with increased mediastinal lymph node uptake on PET-CT, a negative result after lymph node sampling by Endobronchial Ultrasound (EBUS) is not enough to rule out mediastinal lymph node involve- ment, demanding a cervical mediastinoscopy to vouch for the results. Methods and Objectives: In order to study the percentage of lymph node surgical upstaging in patients with neg- ative mediastinal node staging by EBUS and evaluate the role of mediastinoscopy in these patients, we conducted a search in our department’s database using the key-word EBUS in the period concerned between January 2014 and August 2020. A total of 302 patients were found. After applying defined criteria, we obtained 42 cases. Results: Lymph node surgical upstaging occurred in 11 (26%) patients, of which 8 were upstaged to N2 and 3 to N1. Most of the cases were single station. Only in 5 (12% of the total) of the 11 patients, the upstaging was related to lymph node stations previously sampled by EBUS. Upstaging was more frequent among males and lower lobe tumours. Discussion and Conclusions: Regarding the 8 upstage cases for N2, 5 were single station. Of these 8 cases, only 5 would be approachable by cervical mediastinoscopy. Furthermore, 2 of them were single station, eligible for upfront surgery. Then, only in 3 (7%) of the 42 cases cervical mediastinoscopy would be of foremost importance.
description: Portuguese Journal of Cardiac Thoracic and Vascular Surgery, Vol. 28 No. 4 (2021): October - December
On the recent star formation history of the Milky Way disk
Creators: name: Marcos, R. de la Fuente
name: Marcos, C. de la Fuente
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have derived the star formation history of the Milky Way disk over the last 2 Gyr from the age distribution diagram of a large sample of open clusters comprising more than 580 objects. By interpreting the age distribution diagram using numerical results from an extensive library of N-body calculations carried out during the last ten years, we reconstruct the recent star formation history of the Milky Way disk. Our analysis suggests that superimposed on a relatively small level of constant star formation activity mainly in small-N star clusters, the star formation rate has experienced at least 5 episodes of enhanced star formation lasting about 0.2 Gyr with production of larger clusters. This cyclic behavior seems to show a period of 0.4+/-0.1 Gyr.
description: Abridged abstract. Accepted by New Astronomy. Major changes. A number of figures have been added in order to improve the discussion on errors
Informed Consent and Ethical Clearance: Cross-sectional study of consumption patterns of fish, fruits, and vegetables among households in Ado-Ekiti, Nigeria: frequency, quantity, and modes of intakem
Creators: name: Laoye, Babafemi
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 420603
subject: Health promotion

description: Ethical Clearance: Cross-sectional study of consumption patterns of fish, fruits, and vegetables among households in Ado-Ekiti, Nigeria: frequency, quantity, and modes of intake
Making RooFit Ready for Run 3
Creators: name: Hageboeck, Stephan
name: Moneta, Lorenzo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Software (cs.MS)
subject: High Energy Physics - Experiment (hep-ex)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: RooFit and RooStats, the toolkits for statistical modelling in ROOT, are used in most searches and measurements at the Large Hadron Collider. The data to be collected in Run 3 will enable measurements with higher precision and models with larger complexity, but also require faster data processing. In this work, first results on modernising RooFit's collections, restructuring data flow and vectorising likelihood fits in RooFit will be discussed. These improvements will enable the LHC experiments to process larger datasets without having to compromise with respect to model complexity, as fitting times would increase significantly with the large datasets to be expected in Run 3.
description: 5 pages, 5 figures. Proceedings of ACAT 2019. Submitted to Journal Of Physics: Conference Series
HYBRID AORTIC ARCH SURGERY TO CREATE A LANDING ZONE IN THE ASCENDING AORTA
Creators: name: Cruz Tomás, António
name: Laranjeira Santos, Álvaro
name: Pinheiro Santos, Jorge
name: Varela-Afonso, Daniela
name: Fragata, José
Publisher: name: Portuguese Journal of Cardiac Thoracic and Vascular Surgery
Year: 2022

description: Introduction: Thoracic Endovascular Aortic Repair (TEVAR) has enabled the treatment of aortic pathology that previously required open surgery, with higher morbidity and mortality. The need for a favorable landing zone (Lz), without compromising the patency of the supra-aortic vessels meant that Ishimaru Lz 2 was the most proximal technically feasible Lz. We developed a hybrid technique for the creation of a more proximal Lz in high risk patients - in the first stage, debranching/ rerouting of the supra-aortic vessels, with or without ascending aorta replacement, was performed; a few weeks later, a TEVAR with a LZ in the distal ascending aorta was performed. This technique allowed the avoidance of the more aggressive total arch and proximal descending aorta replacement (Elephant Trunk or Frozen Elephant Trunk - FET) in high risk patients. We reviewed all patients who underwent hybrid arch surgery in our Department to create a more proximal Lz that allowed safe TEVAR stent placement. From November 2007 to October 2019, 15 patients required hybrid surgery to achieve treatment - 9 by replacing the ascending aorta and debranching supra-aortic vessels and 6 by debranching and re-routing supra-aortic vessels to the native ascending aorta. All underwent computed tomography angiography within 30 days of surgery and had follow-up with annual appointments and imaging control. Patients’ average age was 65.5 (+/- 11.5) years, 73.3% being male. Average follow-up was 54.7 (+/- 46.2) months. The most common diagnosis was thoracic aortic aneurysm (66.7%), followed by chronic type B aortic dissection (20.0%), pen- etrating atherosclerotic ulcer (6.7%) and reintervention due to endoleak (EL, 6.7%). No in-hospital mortality was registered. ICU and hospital stay was 1.3 (0.8) days and 9.8 (10.3) days, respectively. Survival at 1- and 5- years was 84.6% and 65.8%, respectively. No EL was detected in 66.7% (n=10) of patients. Incidence of early EL was 20.0% (n=3), of which two-thirds had spontaneous resolution, and late EL was 13.3% (n=2). Endovascular reintervention was required in one patient. TEVAR in the context of hybrid surgery is associated with low morbidity and mortality, with a low incidence of EL and good early and long term survival.
description: Portuguese Journal of Cardiac Thoracic and Vascular Surgery, Vol. 28 No. 4 (2021): October - December
Appendix from Constraints and variation in food web link-species space
Creators: name: Gibert, Jean P.
name: Wieczynski, Daniel J.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Environmental Science
subject: Ecology
subject: FOS: Biological sciences

description: Predicting food web structure in future climates is a pressing goal of ecology. These predictions may be impossible without a solid understanding of the factors that structure current food webs. The most fundamental aspect of food web structure—the relationship between the number of links and species—is still poorly understood. Some species interactions may be physically or physiologically ‘forbidden'—like consumption by non-consumer species—with possible consequences for food web structure. We show that accounting for these ‘forbidden interactions' constrains the feasible link-species space, in tight agreement with empirical data. Rather than following one particular scaling relationship, food webs are distributed throughout this space according to shared biotic and abiotic features. Our study provides new insights into the long-standing question of which factors determine this fundamental aspect of food web structure.
The flatness problem and $Λ$
Creators: name: Lake, Kayll
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: By way of a complete integration of the Friedmann equations, in terms of observables, it is shown that for the cosmological constant $Λ> 0$ there exist non-flat FLRW models for which the total density parameter $Ω$ remains $\sim 1$ throughout the entire history of the universe. Further, it is shown that in a precise quantitative sense these models are not finely tuned. When observations are brought to bear on the theory, and in particular the WMAP observations, they confirm that we live in just such a universe. The conclusion holds when the classical notion of $Λ$ is extended to dark energy.
description: Final form to appear in Physical Review Letters. Further information at http://grtensor.org/Robertson/
Wi-Fi Channel Saturation as a Mechanism to Improve Passive Capture of Bluetooth Through Channel Usage Restriction
Creators: name: Lowe, Ian
name: Buchanan, William J
name: Macfarlane, Richard J
name: Lo, Owen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Bluetooth is a short-range wireless technology that provides audio and data links between personal smartphones and playback devices, such as speakers, headsets and car entertainment systems. Since its introduction in 2001, security researchers have suggested that the protocol is weak, and prone to a variety of attacks against its authentication, link management and encryption schemes. Key researchers in the field have suggested that reliable passive sniffing of Bluetooth traffic would enable the practical application of a range of currently hypothesised attacks. Restricting Bluetooth's frequency hopping behaviour by manipulation of the available channels, in order to make brute force attacks more effective has been a frequently proposed avenue of future research from the literature. This paper has evaluated the proposed approach in a series of experiments using the software defined radio tools and custom hardware developed by the Ubertooth project. The work concludes that the mechanism suggested by previous researchers may not deliver the proposed improvements, but describes an as yet undocumented interaction between Bluetooth and Wi-Fi technologies which may provide a Denial of Service attack mechanism.
Accelerated electrons observed down to <7 keV in a NuSTAR solar microflare
Creators: name: Glesener, Lindsay
name: Krucker, S"am
name: Duncan, Jessie
name: Hannah, Iain G.
name: Grefenstette, Brian W.
name: Chen, Bin
name: Smith, David M.
name: White, Stephen M.
name: Hudson, Hugh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report the detection of emission from a non-thermal electron distribution in a small solar microflare (GOES class A5.7) observed by the Nuclear Spectroscopic Telescope Array (NuSTAR), with supporting observation by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI). The flaring plasma is well accounted for by a thick-target model of accelerated electrons collisionally thermalizing within the loop, akin to the "coronal thick target" behavior occasionally observed in larger flares. This is the first positive detection of non-thermal hard X-rays from the Sun using a direct imager (as opposed to indirectly imaging instruments). The accelerated electron distribution has a spectral index of 6.3 +/- 0.7, extends down to at least 6.5 keV, and deposits energy at a rate of ~2x1027 erg/s, heating the flare loop to at least 10 MK. The existence of dominant non-thermal emission in X-rays down to <5 keV means that RHESSI emission is almost entirely non-thermal, contrary to what is usually assumed in RHESSI spectroscopy. The ratio of non-thermal to thermal energies is similar to that of large flares, in contrast to what has been found in previous studies of small RHESSI flares. We suggest that a coronal thick target may be a common property of many small microflares based on the average electron energy and collisional mean free path. Future observations of this kind will enable understanding of how flare particle acceleration changes across energy scales, and will aid the push toward the observational regime of nanoflares, which are a possible source of significant coronal heating.
On the development of differential geometry in Estonia
Creators: name: Abramov, V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: History and Overview (math.HO)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53-03; 01A55; 01A60; 53A07; 53A10; 53A35; 53C07; 53D05; 81R60; 81T13

description: We give a brief review of a research made in the field of differential geometry in Estonia in the period from the beginning of the 19th century to the present time. The biographic data of mathematicians who made a valuable contribution to the development of differential geometry in Estonia in mentioned period are presented. The material presented in the introduction covers the period from the beginning of the 19th century to the middle of the 20th century and it can be considered as a brief historical sketch of the development of differential geometry in Estonia in this period. The next sections give an idea of the modern trends of development of differential geometry in Estonia.
description: 22 pages, based on the talk presented at the Finnish-Estonian Colloquium held in Tallinn (Estonia), May 27-29, 2002
Modulation induced frequency shifts in a CPT-based atomic clock
Creators: name: Phillips, D. F.
name: Novikova, I.
name: Wang, C. Y. -T.
name: Crescimanno, M.
name: Walsworth, R. L.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We investigate systematic errors associated with a common modulation technique used for phase sensitive detection of a coherent population trapping (CPT) resonance. In particular, we show that modification of the CPT resonance lineshape due to the presence of off-resonant fields leads to frequency shifts which may limit the stability of CPT-based atomic clocks. We also demonstrate that an alternative demodulation technique greatly reduces these effects.
description: 14 pages, 7 figures
Media summary from Constraints and variation in food web link-species space
Creators: name: Gibert, Jean P.
name: Wieczynski, Daniel J.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Environmental Science
subject: Ecology
subject: FOS: Biological sciences

description: Predicting food web structure in future climates is a pressing goal of ecology. These predictions may be impossible without a solid understanding of the factors that structure current food webs. The most fundamental aspect of food web structure—the relationship between the number of links and species—is still poorly understood. Some species interactions may be physically or physiologically ‘forbidden'—like consumption by non-consumer species—with possible consequences for food web structure. We show that accounting for these ‘forbidden interactions' constrains the feasible link-species space, in tight agreement with empirical data. Rather than following one particular scaling relationship, food webs are distributed throughout this space according to shared biotic and abiotic features. Our study provides new insights into the long-standing question of which factors determine this fundamental aspect of food web structure.
Ethical Clearance: Cross-sectional study of consumption patterns of fish, fruits, and vegetables among households in Ado-Ekiti, Nigeria: frequency, quantity, and modes of intakem
Creators: name: Laoye, Babafemi
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 420603
subject: Health promotion

description: Ethical Clearance: Cross-sectional study of consumption patterns of fish, fruits, and vegetables among households in Ado-Ekiti, Nigeria: frequency, quantity, and modes of intake
A numerical solution to the local cohomology problem in U(1) chiral gauge theories
Creators: name: Kadoh, Daisuke
name: Kikukawa, Yoshio
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We consider a numerical method to solve the local cohomology problem related to the gauge anomaly cancellation in U(1) chiral gauge theories. In the cohomological analysis of the chiral anomaly, it is required to carry out the differentiation and the integration of the anomaly with respect to the continuous parameter for the interpolation of the admissible gauge fields. In our numerical approach, the differentiation is evaluated explicitly through the rational approximation of the overlap Dirac operator with Zolotarev optimization. The integration is performed with a Gaussian Quadrature formula, which turns out to show rather good convergence. The Poincare lemma is reformulated for the finite lattice and is implemented numerically. We compute the current associated with the cohomologically trivial part of the chiral anomaly in two-dimensions and check its locality properties.
description: 11pages, 6 figures, REVTeX4; references added
Hyperfine and quadrupole interactions for Dy isotopes in DyPc$_2$ molecules
Creators: name: Wysocki, Aleksander L.
name: Park, Kyungwha
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Nuclear spin levels play an important role in understanding magnetization dynamics and implementation and control of quantum bits in lanthanide-based single-molecule magnets. We investigate the hyperfine and nuclear quadrupole interactions for $^{161}$Dy and $^{163}$Dy nucleus in anionic DyPc$_2$ (Pc=phthalocyanine) single-molecule magnets, using multiconfigurational ab-initio methods (beyond density-functional theory) including spin-orbit interaction. The two isotopes of Dy are chosen because the others have zero nuclear spin. Both isotopes have the nuclear spin $I=5/2$, although the magnitude and sign of the nuclear magnetic moment differ from each other. The large energy gap between the electronic ground and first-excited Kramers doublets, allows us to map the microscopic hyperfine and quadrupole interaction Hamiltonian onto an effective Hamiltonian with an electronic pseudo-spin $S_{\rm eff}=1/2$ that corresponds to the ground Kramers doublet. Our ab-initio calculations show that the coupling between the nuclear spin and electronic orbital angular momentum contributes the most to the hyperfine interaction and that both the hyperfine and nuclear quadrupole interactions for $^{161}$Dy and $^{163}$Dy nucleus are much smaller than those for $^{159}$Tb nucleus in TbPc$_2$ single-molecule magnets. The calculated separations of the electronic-nuclear levels are comparable to experimental data reported for $^{163}$DyPc$_2$. We demonstrate that hyperfine interaction for Dy Kramers ion leads to tunnel splitting (or quantum tunneling of magnetization) at zero field. This effect does not occur for TbPc$_2$ single-molecule magnets. The magnetic field values of the avoided level crossings for $^{161}$DyPc$_2$ and $^{163}$DyPc$_2$ are found to be noticeably different, which can be observed from experiment.
description: 14 pages, 5 figures
A note on factorizations of finite groups
Creators: name: Bergman, George M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20D60 (Primary)

description: In Question 19.35 of the Kourovka Notebook, M. H. Hooshmand asks whether, given a finite group $G$ and a factorization $\mathrm{card}(G)= n_1\ldots n_k$, one can always find subsets $A_1,\ldots,A_k$ of $G$ with $\mathrm{card}(A_i)=n_i$ such that $G=A_1\ldots A_k;$ equivalently, such that the group multiplication map $A_1\times\ldots\times A_k\to G$ is a bijection. We show that for $G$ the alternating group on 4 elements, $k=3$, and $(n_1,n_2,n_3) = (2,3,2)$, the answer is negative. We then generalize some of the tools used in our proof, and note an open question.
description: 3 pages. Copy at http://math.berkeley.edu/~gbergman/papers may be updated more frequently than arXiv copy
Towards a realistic GaAs-spin qubit device for a classical error-corrected quantum memory
Creators: name: Rispler, Manuel
name: Cerfontaine, Pascal
name: Langrock, Veit
name: Terhal, Barbara M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Based on numerically-optimized real-device gates and parameters we study the performance of the phase-flip (repetition) code on a linear array of Gallium Arsenide (GaAs) quantum dots hosting singlet-triplet qubits. We first examine the expected performance of the code using simple error models of circuit-level and phenomenological noise, reporting, for example, a circuit-level depolarizing noise threshold of approximately 3%. We then perform density-matrix simulations using a maximum-likelihood and minimum-weight matching decoder to study the effect of real-device dephasing, read-out error, quasi-static as well as fast gate noise. Considering the trade-off between qubit read-out error and dephasing time (T2) over measurement time, we identify a sub-threshold region for the phase-flip code which lies within experimental reach.
description: 22 pages
The Origin of Mass
Creators: name: Froggatt, C. D.
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The quark-lepton mass problem and the ideas of mass protection are reviewed. The hierarchy problem and suggestions for its resolution, including Little Higgs models, are discussed. The Multiple Point Principle is introduced and used within the Standard Model to predict the top quark and Higgs particle masses. Mass matrix ansätze are considered; in particular we discuss the lightest family mass generation model, in which all the quark mixing angles are successfully expressed in terms of simple expressions involving quark mass ratios. It is argued that an underlying chiral flavour symmetry is responsible for the hierarchical texture of the fermion mass matrices. The phenomenology of neutrino mass matrices is briefly discussed.
description: 33 pages, 7 figures, to be published in the Proceedings of the XXXI ITEP Winter School, Moscow, Russia, 18 - 26 February 2003
title: ЦИФРОВОЙ АВТОРИТАРИЗМ И ЭЛЕКТРОННАЯ ДЕМОКРАТИЯ: СОДЕРЖАНИЕ И ГРАНИЦЫ
Creators: name: ВЛАСОВА ОЛЬГА ЮРЬЕВНА
Publisher: name: Studia Humanitatis
Year: 2020
Subjects: ЦИФРОВОЙ АВТОРИТАРИЗМ
ЭЛЕКТРОННАЯ ДЕМОКРАТИЯ
ГРАЖДАНСКОЕ ОБЩЕСТВО
ЭЛЕКТРОННОЕ УЧАСТИЕ
ЦИФРОВИЗАЦИЯ
ПРАВА ЧЕЛОВЕКА
DIGITALIZED AUTHORITARIANISM
E-DEMOCRACY
CIVIL SOCIETY
E-PARTICIPATION
DIGITALIZATION
HUMAN RIGHTS

description: Современные цифровые технологии заставляют по-новому взглянуть на классические понятия авторитаризма и демократии. В статье описываются оба эти понятия, а также условия существования как цифрового авторитаризма, так и электронной демократии, которые зачастую используют схожие политические механизмы (например, электронное участие). Автор подробно останавливается на зыбкости понятия демократии в цифровую эпоху и обозначает свои условия для ее возникновения и эффективной деятельности. Фактор возникновения и становления электронной демократии (либо снизу через платформы гражданского общества, либо с государственного уровня) может стать критичным для устойчивости и длительности ее функционирования.
Room Temperature Electrochemical Synthesis of Hg-1212 Superconducting Thin Films
Creators: name: Shivagan, D. D.
name: Shirage, P. M.
name: Ekal, L. A.
name: Pawar, S. H.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In the present investigation, the novel two-step electrochemical process of room temperature synthesis of Hg-1212 superconducting films has been developed and reported first time. Electrochemical parameters were optimized by studying cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry (CA) for the deposition of Hg-Ba-Ca-Cu alloy at room temperature. Current time transient showed progressive growth with hemispheriodal granules, which were then revealed by scanning electron microscopy (SEM). Stoichiometric electrocrystallization to get Hg1Ba2Ca1Cu2O6+x (Hg-1212) was completed by electrochemically intercalating oxygen species into Hg-Ba-Ca-Cu alloy at room temperature. The oxygen content in the samples was varied by varying the electrochemical oxidation period and the changes in the crystal structure, microstructure, and superconducting transition temperature (Tc) and critical current density (Jc) were recorded. The films oxidized for 28 min showed Tc = 104.7 K with Jc = 1.437 x 103 A/cm2. The dependence of superconducting parameters on oxygen content is correlated with structure property relations and reported in this paper.
description: 39 pages, 17 figures. Submitted to Physica C
Assessing the sustainability of the UBC Food System
Creators: name: Aulakh, Amarjot
name: Bekkers, Christina
name: Cuadra, Arlen
name: Henley, Vicki
name: Kwok, Day
name: Ng, Edith
name: Robins, Stacy
name: Turcotte, Marc
Publisher: name: The University of British Columbia
Year: 2014

description: Food production and distribution on the UBC campus is conducted through UBC Food Services and AMS Food Services. Presently, through our strong and weak anthropocentric, and community-based values, our group assessed sustainability through indicators such as the number of culturally diverse food establishments in proportion to the number of ethnic populations on campus, the availability of healthy and affordable options, and post-consumer food packaging waste. Our methods of data collection include these social, economic, and ecological perspectives. Social sustainability will be assessed through collaboration between UBC Food Services and AMS Food Services to initiate a planning process with research, implementation, and evaluation proposals for the introduction of more culturally appropriate food establishments for the diverse UBC community. Economic sustainability can be evaluated by data collection and tabulation of the number of healthy meal choices available in increasing price ranges, to provide information such as choice of healthy, complete meals with respect to price. The ecological indicator will be assessed by measuring the amount of noncompostable versus compostable post-consumer food and food packaging waste on campus. As part of our research model, we propose the use of foam laminate products instead of Styrofoam or paper products. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Hasse Polynomials of L-functions of Certain Exponential Sums
Creators: name: Chen, Chao
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: Primary 11S40, 11T23, 11L07

description: In this paper, we focus on computing the higher slope Hasse polynomials of L-functions of certain exponential sums associated to the following family of Laurent polynomials $f(x_1,\ldots ,x_{n+1})=\sum_{i=1}^na_i x_{n+1}\left(x_i+\frac{1}{x_i}\right)+a_{n+1} x_{n+1}+\frac{1}{x_{n+1}}$, where $a_i \in \F^*_{q}$, $i=1,2, \ldots, n+1$. We find a simple formula for the Hasse polynomial of the slope one side and study the irreducibility of these Hasse polynomials. We will also provide a simple form of all the higher slope Hasse polynomials for $n=3$, answering an open question of Zhang and Feng.
Large evolution of the bilinear Higgs coupling parameter in SUSY models and reduction of phase sensitivity
Creators: name: Chattopadhyay, Utpal
name: Choudhury, Debajyoti
name: Das, Debottam
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The phases in a generic low-energy supersymmetric model are severely constrained by the experimental upper bounds on the electric dipole moments of the electron and the neutron. Coupled with the requirement of radiative electroweak symmetry breaking, this results in a large degree of fine tuning of the phase parameters at the unification scale. In supergravity type models, this corresponds to very highly tuned values for the phases of the bilinear Higgs coupling parameter $B$ and the universal trilinear coupling $A_0$. We identify a cancellation/enhancement mechanism associated with the renormalization group evolution of $B$, which, in turn, reduces such fine-tuning quite appreciably without taking recourse to very large masses for the supersymmetric partners. We find a significant amount of reduction of this fine-tuning in nonuniversal gaugino mass models that do not introduce any new phases.
description: Version to appear in Phys.Rev.D. Insignificant changes like a few typos corrected. 26 pages, 7 figures, LaTex
An Algebraic q-Deformed Form for Shape-Invariant Systems
Creators: name: Aleixo, A. N. F.
name: Balantekin, A. B.
name: Ribeiro, M. A. Candido
Publisher: name: arXiv
Year: 2003
Subjects: subject: Mathematical Physics (math-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences
subject: 58D30

description: A quantum deformed theory applicable to all shape-invariant bound-state systems is introduced by defining q-deformed ladder operators. We show these new ladder operators satisfy new q-deformed commutation relations. In this context we construct an alternative q-deformed model that preserve the shape-invariance property presented by primary system. q-deformed generalizations of Morse, Scarf, and Coulomb potentials are given as examples.
Volatilité des cours des commodités agricoles et politiques de stabilisation
Creators: name: Femenia, Fabienne
name: Gouel, Christophe
name: Femenia, Fabienne
name: Gouel, Christophe
Publisher: name: Unknown
Year: 2016
Subjects: Agricultural and Food Policy
Public Economics

description: Le retour d’une importante volatilité des prix agricoles au cours de la dernière décennie a relancé le débat sur les politiques de stabilisation des prix. Cette synthèse fait le point sur ce débat en se basant essentiellement sur les travaux issus des recherches du département SAE2 de l’Inra. Cette synthèse tente de répondre à trois questions. (1) Faut-il intervenir avec des politiques de stabilisation des prix ? Cela implique, dans un premier temps, de s’intéresser à l’optimalité de la dynamique des prix et donc de revenir sur le débat ancien entre modèles à dynamique endogène (cobweb) et modèles à anticipations rationnelles. Dans un second temps, se pose la question de la capacité des agents à faire face au risque de prix et aux bénéfices qu’ils pourraient retirer d’une stabilisation des prix. (2) S’il est justifié d’intervenir, comment le faire ? Il s’agit là d’analyser la conception des politiques de stabilisation : la meilleure manière d’intervenir en combinant politique de stockage et politique commerciale pour un objectif donné. Ces interventions optimales sont ensuite mises en perspective par rapport aux politiques effectivement utilisées dans le passé. (3) Comment limiter les effets déstabilisateurs de ces politiques sur le plan international ? Des politiques qui font sens du point du vue d’un pays peuvent en effet être dommageables aux pays tiers. Pour limiter les effets négatifs, il est important de comprendre dans quelle mesure ces politiques peuvent faire l’objet d’accords internationaux. Pour l’instant, les conclusions de la recherche sont plutôt pessimistes : une coordination internationale sur des politiques commerciales contra-cycliques moins interventionnistes est peu probable.
Livestock movement and emerging zoonotic disease outbreaks : Applying ecological, network, and sociocultural theories to assess the risk of Middle East respiratory syndrome from camel trade
Creators: name: Roess, A.
name: Carruth, L.
name: Mann, M.
name: Kabbash, I.
name: Melaku, S.
name: Atia, M.
name: Mohamed, M.
name: Bansal, S.
name: Lahm, S.
name: Terefe, Y.
name: Salman, M.
Publisher: name: CC BY
Year: 2023
Subjects: classificationCode: 30
subject: Agricultural, veterinary and food sciences

description: Description to be added
La territorialisation des systèmes de production : Une approche nécessairement multidisciplinaire
Creators: name: Thomas, Alban
name: Gojard, Severine
name: Detang-Dessendre, Cecile
name: Thomas, Alban
name: Gojard, Severine
name: Detang-Dessendre, Cecile
Publisher: name: Unknown
Year: 2017
Subjects: Environmental Economics and Policy
Research Methods/ Statistical Methods

description: Ce numéro double d’Inra Sciences Sociales constitue une synthèse de la journée thématique, organisée par le département SAE2 (Sciences Sociales) de l’Inra, le 16 décembre 2016 à Paris. Cette journée avait pour objectif de présenter des travaux de recherche de scientifiques du département SAE2 de l’Inra (et qui pour l’occasion a été élargie à d’autres départements) aux chercheurs et aux experts intéressés par la question du changement d’échelle dans la représentation des systèmes de production agricoles et forestiers. Les présentations de scientifiques de l’Inra ont permis de partager les enjeux scientifiques et techniques ainsi que les approches utilisées pour passer du niveau de la parcelle, du troupeau, de l’exploitation agricole ou de la propriété forestière, à celui du territoire (ou inversement). Elles ont fourni un aperçu de la variété des méthodes utilisées par les chercheurs, en lien avec les questions posées dans leurs disciplines et en fonction des données disponibles.
Entre préservation de l’environnement et santé, une analyse coût-bénéfice des recommandations alimentaires
Creators: name: Irz, Xavier
name: Leroy, Pascal
name: Requillart, Vincent
name: Soler, Louis-Georges
name: Irz, Xavier
name: Leroy, Pascal
name: Requillart, Vincent
name: Soler, Louis-Georges
Publisher: name: Unknown
Year: 2017
Subjects: Agricultural and Food Policy
Consumer/Household Economics

description: Conscients qu’une alimentation déséquilibrée peut être à l’origine d’un nombre important de pathologies chroniques, de nombreux pays lancent des campagnes d’information pour inciter les consommateurs à adopter une alimentation meilleure pour la santé en consommant moins de gras, de sucres et de sel et plus de fruits et légumes. Récemment, des études ont également montré que l’alimentation pouvait être à l’origine de 15 à 30 % des émissions de gaz à effet de serre (GES) des pays développés. La nécessité de limiter les émissions de GES conduit de nombreux experts à recommander des changements de comportements alimentaires et l’adoption de régimes moins impactants sur le plan environnemental. Ces recommandations, qui portent notamment sur la baisse de la consommation de produits d’origine animale, ne sont pas encore intégrées aux campagnes d’information mises en place par la puissance publique en France. Nous avons évalué les coûts et les bénéfices de diverses recommandations alimentaires et nutritionnelles qui prendraient en compte ce double enjeu sanitaire et environnemental. Nos résultats montrent que : le coût d’adoption par les consommateurs varie fortement selon les recommandations envisagées ; les objectifs de réduction des émissions de GES et de santé publique sont généralement compatibles ; la valeur économique des effets sur la santé est généralement bien supérieure à celle des effets de réduction des émissions de GES ; pour bon nombre de recommandations, les politiques d’information des consommateurs présentent un bilan coût bénéfice favorable suggérant qu’il est pertinent d’intensifier ces campagnes d’information.
Livestock movement and emerging zoonotic disease outbreaks : Applying ecological, network, and sociocultural theories to assess the risk of Middle East respiratory syndrome from camel trade
Creators: name: Roess, A.
name: Carruth, L.
name: Mann, M.
name: Kabbash, I.
name: Melaku, S.
name: Atia, M.
name: Mohamed, M.
name: Bansal, S.
name: Lahm, S.
name: Terefe, Y.
name: Salman, M.
Publisher: name: American University
Year: 2023

description: Description to be added
The sustainability of UBC Food System Collaborative Project II : a research design and methodology for assessing the sustainability of UBC Food System
Creators: name: Blond, Danielle
name: Drissler, Michelle
name: Hubert, Freddy
name: Lam, Ellen
name: Ngai, May
name: Schimpl, Tanya
name: Varghese, Thara
Publisher: name: The University of British Columbia
Year: 2014

description: The focus of this report is a proposed research project based on the long-term sustainability of the UBC Food System. As a team we assessed the current food system with the knowledge we had gained through the required course readings and the UBC Campus Sustainability Office. The goals we found important, in order for UBC to move along a continuum from unsustainable to sustainable, were defined by our underlying value assumptions and our community-based approach. We felt that focusing on the three spheres of sustainability (ecology, economy and social entities), was too broad of an approach to accurately measure the state and progression of the UBC food system and chose instead goals that overlap in terms of ecological, economic or social impacts, yet as a result of this are more tangible, precise and practical. The rationale behind our goals is to find workable indicators with valid and useful means of measurement. As the reader moves through this paper, the goals are defined in terms of their indicators and subsequently, ideas by which to assess the indicator are given. This research proposal would not be complete without outlining our view for the future of the UBC Food System. Our recommendations are a reflection of the current system and the untapped promise this possibility holds. When we found ourselves at the end of this journey we realized that the concept of sustainability is not only complex but also that it cannot exist unless we, as a community, experience a paradigm shift that allows a holistic view of the food system, encompassing all social, economical and ecological elements. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Excitonic Effects and Optical Spectra of Single-Walled Carbon Nanotubes
Creators: name: Spataru, Catalin D.
name: Ismail-Beigi, Sohrab
name: Benedict, Lorin X.
name: Louie, Steven G.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Many-electron effects often dramatically modify the properties of reduced dimensional systems. We report calculations, based on an many-electron Green's function approach, of electron-hole interaction effects on the optical spectra of small-diameter single-walled carbon nanotubes. Excitonic effects qualitatively alter the optical spectra of both semiconducting and metallic tubes. Excitons are bound by ~ 1 eV in the semiconducting (8,0) tube and by ~ 100 meV in the metallic (3,3) tube. These large many-electron effects explain the discrepancies between previous theories and experiments.
description: 6 pages, 3 figures, 2 tables