cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Students' ability to differentiate between healthy and unhealthy stress : final research project
Creators: name: Seligman, Candice
name: To, Celine
name: Vu, Elizabeth
Publisher: name: The University of British Columbia
Year: 2016

description: This study was conducted to explore the research question: Can students differentiate between healthy and unhealthy stress? How do coping mechanisms differ as number of different upcoming deadlines increase? It was predicted that students who are better able to differentiate between healthy and unhealthy stress will have healthier coping mechanisms, despite the number of upcoming deadlines that they have. Healthy coping mechanisms was defined as having a higher COPE inventory score on engagement compared to disengagement. Similarly, unhealthy coping was defined as a higher score for disengagement than engagement on the COPE inventory. Tobin (1985) defined engagement as the attempts by the individual to actively engage in efforts to manage their stressful situation. In contrast, disengagement was defined as strategies that likely result in the individual avoiding thoughts about the situation and refraining from behaviours that may change their stressful situation. One hundred students at The University of British Columbia were selected using a convenience-sampling method to take part in an online modified COPE inventory questionnaire. The results did not support our hypothesis. It was found that 59.4% of participants correctly identified their method of coping with stress (healthy or unhealthy), but although students were able to differentiate between healthy and unhealthy stress, this did not appear to be correlated with having healthier coping mechanisms. 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.”
Hysteresis loops of Co-Pt perpendicular magnetic multilayers
Creators: name: Mobley, David L.
name: Pike, Christopher R.
name: Davies, Joseph E.
name: Cox, Daniel L.
name: Singh, Rajiv R. P.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: We develop a phenomenological model to study magnetic hysteresis in two samples designed as possible perpendicular recording media. A stochastic cellular automata model captures cooperative behavior in the nucleation of magnetic domains. We show how this simple model turns broad hysteresis loops into loops with sharp drops like those observed in these samples, and explains their unusual features. We also present, and experimentally verify, predictions of this model, and suggest how insights from this model may apply more generally.
description: 4.5 pages, 5 figures
Higher Dimensional Recombination of Intersecting D-branes
Creators: name: Nagaoka, Satoshi
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study recombinations of D-brane systems intersecting at more than one angle using super Yang-Mills theory. We find the condensation of an off-diagonal tachyon mode relates to the recombination, as was clarified for branes at one angle in hep-th/0303204. For branes at two angles, after the tachyon mode between two D2-branes condensed, D2-brane charge is distributed in the bulk near the intersection point. We also find that, when two intersection angles are equal, the off-diagonal lowest mode is massless, and a new stable non-abelian configuration, which is supersymmetric up to a quadratic order in the fluctuations, is obtained by the deformation by this mode.
description: 18 pages, 2 figures, JHEP style. v3:references added, minor corrections, English improved
THE DIVIDE AND CONQUER HYPOTHESIS: AN ANALYSIS OF INTERNAL LABOR MARKETS AND RACIAL INEQUALITY OF MEN IN THE UNITED STATES
Creators: name: Kaplan, Joel
Publisher: name: American University
Year: 2023

description: Marxist economists have focused on the "divide and conquer" hypothesis as an explanation for the reproduction ot racial inequality in the United States. The underlying methodological framework is an historically rooted analysis of class divisions and class conflicts in which racial inequality is a means of maintaining capitalist hegemony. This model of racial inequality is linked to the bureaucratization of the firm and to the development of internal labor markets. It is argued that the creation of these social structures by the capitalist class institutionalized racism, insuring capitalist hegemony and the exploitative nature of the social relations of production. This theory is posited as an explanation for the relatively flat earnings profile of black men compared to white men. This dissertation will analyze the "divide and conquer" hypothesis, both theoretically and empirically. By incorporating into the analysis the role of individual capitals and the role of organized labor in the formation of internal labor markets, this dissertation will provide an alternative theoretical explanation for the reproduction of racial inequality. This analysis will lead to the conclusion that the ability of some workers to protect their jobs and wage structure through the development of internal labor markets has been a victory for some white workers, but has had the effect of limiting black labor to a narrow band within the occupational spectrum. Empirically, I propose a study of internal labor markets that will provide a test for the validity of the "divide and conquer" hypothesis. In this work, I develop a model analyzing the effects of unionization and internal labor markets on white to black wages. I will demonstrate that the relative gains as a consequence of unionization have been mitigated by the countervailing forces imposed by the use of internal labor market structures.
Proof of the Double Bubble Conjecture
Creators: name: Hutchings, Michael
name: Morgan, Frank
name: Ritoré, Manuel
name: Ros, Antonio
Publisher: name: arXiv
Year: 2004
Subjects: subject: Differential Geometry (math.DG)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics

description: We prove that the standard double bubble provides the least-area way to enclose and separate two regions of prescribed volume in \Bbb R^3.
description: 31 pages, published version
THE DIVIDE AND CONQUER HYPOTHESIS: AN ANALYSIS OF INTERNAL LABOR MARKETS AND RACIAL INEQUALITY OF MEN IN THE UNITED STATES
Creators: name: Kaplan, Joel
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 38
subject: Economics

description: Marxist economists have focused on the "divide and conquer" hypothesis as an explanation for the reproduction ot racial inequality in the United States. The underlying methodological framework is an historically rooted analysis of class divisions and class conflicts in which racial inequality is a means of maintaining capitalist hegemony. This model of racial inequality is linked to the bureaucratization of the firm and to the development of internal labor markets. It is argued that the creation of these social structures by the capitalist class institutionalized racism, insuring capitalist hegemony and the exploitative nature of the social relations of production. This theory is posited as an explanation for the relatively flat earnings profile of black men compared to white men. This dissertation will analyze the "divide and conquer" hypothesis, both theoretically and empirically. By incorporating into the analysis the role of individual capitals and the role of organized labor in the formation of internal labor markets, this dissertation will provide an alternative theoretical explanation for the reproduction of racial inequality. This analysis will lead to the conclusion that the ability of some workers to protect their jobs and wage structure through the development of internal labor markets has been a victory for some white workers, but has had the effect of limiting black labor to a narrow band within the occupational spectrum. Empirically, I propose a study of internal labor markets that will provide a test for the validity of the "divide and conquer" hypothesis. In this work, I develop a model analyzing the effects of unionization and internal labor markets on white to black wages. I will demonstrate that the relative gains as a consequence of unionization have been mitigated by the countervailing forces imposed by the use of internal labor market structures.
THE FORMATION OF EXPECTATIONS AND THE DEMAND FOR CAPITAL (UNCERTAINTY, RISK, INVESTMENT)
Creators: name: Peterson, John F.
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 38
subject: Economics
classificationCode: 3803
subject: Economic theory

description: This study uses the pattern of business investment expenditures in fixed plant and equipment as the focal point of a test of two possible ways in which firms form expectations about the future. Fixed investment was used because the anticipated profitability of an investment, and therefore the decision to invest, is crucially dependent upon forecasting method used by the firm. There are basically three aspects to the study. First, is a derivation that acknowledges the existence of uncertainty, an investment function is developed which reflects how investment expenditures are dependent upon: (a) expected, or forecasted, values of relative prices, tax parameters, interest rates, and the general level of demand, (b) the level of uncertainty regarding the ability of the firm to forecast well, and (c) the degree to which forecasts are borne out by events. Then two sets of forecasted values are collected for the 1971 to 1984 period. One set is based on a sophisticated "trending out" method, in which the forecasted values of each economic variable is based solely on the history of the variable itself. The second set of forecasted values is the history of the forecasts of Wharton Econometric Forecasting Associates. The Wharton forecast method utilizes an econometric model which is based largely on Keynesian theory, and therefore it represents the prevailing Keynesian view of the behavior of the economy. The third step was the use of the forecasted values as explanatory values in a regression analysis of investment to determine which of the two sets of forecast values, given the specification of the investment function determined in the first step, best explain the pattern of investment expenditures in the 1970s and early 80s. The forecast data set with the best explanatory value is the set that best corresponds to the forecast method that is used by firms. The results indicated both that the specification of the investment function was appropriate, and that firms use a forecasting method that includes much more information than a simple trending of historical data. This implies that the coefficients of investment equations based on historical data alone are erroneous, and that the use of such equations to evaluate proposed investment policies is misleading.
Optimal Dynamic Risk Sharing when Enforcement is a Decision Variable
Creators: name: Koeppl, Thorsten
name: Koeppl, Thorsten
Publisher: name: Unknown
Year: 2005
Subjects: subject: Financial Economics
subject: Limited Commitment
subject: Risk Sharing
subject: Third-party Enforcement

description: Societies provide institutions that are costly to set up, but able to enforce longrun relationships. We study the optimal decision problem of using self-governance for risk sharing or governance through enforcement provided by these institutions. Third-party enforcement is modelled as a costly technology that consumes resources, but permits the punishment of agents who deviate from ex-ante specified allocations. We show that it is optimal to employ the technology whenever commitment problems prevent first-best risk sharing, but never optimal to provide incentives exclusively via this technology. Commitment problems then persist and the optimal incentive structure changes dynamically over time with third-party enforcement monotonically increasing in the relative inequality between agents.
Hierarchical Conditional Relation Networks for Video Question Answering
Creators: name: Le, Thao Minh
name: Le, Vuong
name: Venkatesh, Svetha
name: Tran, Truyen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Video question answering (VideoQA) is challenging as it requires modeling capacity to distill dynamic visual artifacts and distant relations and to associate them with linguistic concepts. We introduce a general-purpose reusable neural unit called Conditional Relation Network (CRN) that serves as a building block to construct more sophisticated structures for representation and reasoning over video. CRN takes as input an array of tensorial objects and a conditioning feature, and computes an array of encoded output objects. Model building becomes a simple exercise of replication, rearrangement and stacking of these reusable units for diverse modalities and contextual information. This design thus supports high-order relational and multi-step reasoning. The resulting architecture for VideoQA is a CRN hierarchy whose branches represent sub-videos or clips, all sharing the same question as the contextual condition. Our evaluations on well-known datasets achieved new SoTA results, demonstrating the impact of building a general-purpose reasoning unit on complex domains such as VideoQA.
description: Check out our code on GitHub at https://github.com/thaolmk54/hcrn-videoqa
Magnetic condensation, Abelian dominance and instability of Savvidy vacuum
Creators: name: Kondo, Kei-Ichi
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that a certain type of color magnetic condensation originating from magnetic monopole configurations is sufficient to provide the mass for off-diagonal gluons in the SU(2) Yang-Mills theory under the Cho--Faddeev--Niemi decomposition. We point out that the generated gluon mass can cure the instability of the Savvidy vacuum. In fact, such a novel type of magnetic condensation is shown to occur by calculating the effective potential. This enables us to explain the infrared Abelian dominance and monopole dominance by way of a non-Abelian Stokes theorem, which suggests the dual superconductivity picture of quark confinement. Finally, we discuss the implication to the Faddeev-Skyrme model with knot soliton as a low-energy effective theory of Yang-Mills theory.
description: 14 pages, 2 figures; a version accepted in Phys. Lett. B, Main changes in sections 2.5 and 2.6. in order to explain the crucial idea better
Efficient Simulation of Loop Quantum Gravity -- A Scalable Linear-Optical Approach
Creators: name: Cohen, Lior
name: Brady, Anthony J.
name: Huang, Zichang
name: Liu, Hongguang
name: Qu, Dongxue
name: Dowling, Jonathan P.
name: Han, Muxin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The problem of simulating complex quantum processes on classical computers gave rise to the field of quantum simulations. Quantum simulators solve problems, such as Boson sampling, where classical counterparts fail. In another field of physics, the unification of general relativity and quantum theory is one of the greatest challenges of our time. One leading approach is Loop Quantum Gravity (LQG). Here, we connect these two fields and design a linear-optical simulator such that the evolution of the optical quantum gates simulates the spinfoam amplitudes of LQG. It has been shown that computing transition amplitudes in simple quantum field theories falls into the class BQP -- which strongly suggests that computing transition amplitudes of LQG are classically intractable. Therefore, these amplitudes are efficiently computable with universal quantum computers which are, alas, possibly decades away. We propose here an alternative special-purpose linear-optical quantum computer, which can be implemented using current technologies. This machine is capable of efficiently computing these quantities. This work opens a new way to relate quantum gravity to quantum information and will expand our understanding of the theory.
description: 5 pages, 3 figures, comments are welcome
Investigation of Fatigue and Compression Strength for the PMMA Reinforced by Different System for Denture Applications
Creators: name: Oleiwi, Jawad K.
Publisher: name: figshare
Year: 2020
Subjects: subject: 110501 Dental Materials and Equipment
subject: FOS: Clinical medicine
subject: 90301 Biomaterials
subject: FOS: Medical engineering
subject: 91299 Materials Engineering not elsewhere classified
subject: FOS: Materials engineering

description: In the present search, attempts are made to develop the properties of PMMA resin that used for upper and lowerprosthesis complete denture, by addition two different types of particles, which included: nano-hydroxyapatite (nHA) particles and micro-zirconia (ZrO2) particles that added with different volume fractions of (1%, 2% and 3%) to poly methyl methacrylate (PMMA) cold cured resin as new fluid resin as a matrix. Also woven glass fiber kind (E-glass) and woven Kevlar fiber kind (49), it were added with a fixed volume fraction of (5%) to PMMA composites. In this work the composite prosthetic dentures specimens preparation was done by using (Hand Lay-Up) method as six groups which includes: the first group consists of PMMA resin reinforced by nHA particles, the second group consists of PMMA resin reinforced by ZrO2 particles, the third group consists of (PMMA-nHA) and glass fiber layer as laminated composite , the fourth group consists of (PMMA-ZrO2) and glassfiber layer, the fifth group consists of (PMMA-nHA) and Kevlar fiber layer and the sixth group consists of (PMMA-ZrO2) and Kevlar fiber layer. The compression test result shows that the values of compression strength increased with increasing the volume fraction of (nHA and ZrO2) particles for all groups’ specimens. And the results showed the (PMMA-ZrO2) composite has greater values for compression strength. As well as the results shows that the maximum value of compression strength for hybridlaminated composite is obtained in hybrid laminated composite materials for fourth groups’ specimens (PMMA-ZrO2-5% Glass Fiber). Whereas the values of fatigue strength of hybrid laminated composite (PMMA-5% Kevlar fiber-3% nHA), it was higher than the fatigue strength of hybrid laminated composite (PMMA-5% Glass fiber-3% nHA) and the base material (Pure PMMA). The fatigue strength values at (106) loading Cycle for these specimens were (52, 38 and 15 MPa) respectively.
Entanglement Criteria - Quantum and Topological
Creators: name: Kauffman, Louis H.
name: Lomonaco, Samuel J.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This paper gives a criterion for detecting the entanglement of a quantum state, and uses it to study the relationship between topological and quantum entanglement. It is fundamental to view topological entanglements such as braids as entanglement operators and to associate to them unitary operators that are capable of creating quantum entanglement. The entanglement criterion is used to explore this connection. The paper discusses non-locality in the light of this criterion.
description: 8 pages, LaTeX, to appear in proceedings of Spie Conference, Orlando, Fla, April 2003
Racial and Ethnic Disparities in Illinois Lung Cancer Incidence, Mortality Stage at Diagnosis, Surgical Treatment, and Screening
Creators: name: Golechha, Ritika
Publisher: name: DigitalHub. Galter Health Sciences Library & Learning Center
Year: 2020
Subjects: subject: lung cancer
subject: health disparities
subject: Illinois
subject: race
subject: ethnicity
subject: Ethnic and Racial Minorities
subject: Lung Neoplasms
subject: Illinois Territory

description: Objectives To determine the extent of lung cancer racial and ethnic disparities in Illinois.Methods We used census data to compute race and ethnic rate ratios for publicly available Illinois lung cancer registry and hospital admissions data comparing incidence, mortality, stage at diagnosis, medical admissions, surgical admissions, screening and smoking prevalence by race and ethnicity.Results  Despite having a lower prevalence of smoking compared to non-Hispanic whites, non-Hispanic blacks had the highest lung cancer incidence, mortality, diagnosis at distant stage, and lung cancer related hospital admission rates, as well as a lower screening rate and fewer surgical admissions. Hispanics had lower rates of lung cancer incidence and hospital care but had a much higher rate of diagnosis at distant stage.Conclusions Non-Hispanic blacks in Illinois continue to have a disproportionate burden of lung cancer morbidity and mortality. Disparities in lung cancer outcomes appear to be driven by social determinants of health rather than smoking rates.
$\mathcal{PT}$-symmetry-breaking enhanced cavity optomechanical magnetometry
Creators: name: Zhang, Zhucheng
name: Wang, Yi-Ping
name: Wang, Xiaoguang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: $\mathcal{PT}$-symmetry-breaking enhanced cavity optomechanical magnetometer is proposed, which is achieved by monitoring the change of intensity of a nonlinear four-wave mixing (FWM) process in a gain-cavity-assisted cavity optomechanical system (COMS). Compared with the traditional single loss COMS, the FWM intensity can be enhanced by two orders of magnitude when the gain-cavity-assisted COMS operates at the $\mathcal{PT}$-symmetry-breaking phase. Meanwhile, the sensitivity of magnetic field sensing can be increased from $10^{-9}$T to $10^{-11}$T. This originally comes from the fact that the effective detuning and decay of loss-cavity can be effectively modified in the $\mathcal{PT}$-symmetry-breaking phase. Our work shows that an ultrahigh-sensitivity magnetometer can be achieved in the $\mathcal{PT}$-symmetry-breaking COMS, which will have wide applications in the field of quantum sensing.
description: 6 pages, 5 figures
Multiplicity of charged particles in Pb-Pb collisions at SPS energies
Creators: name: The NA57 Collaboration
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The multiplicity of charged particles in the central rapidity region has been measured by the NA57 experiment in Pb--Pb collisions at the CERN SPS at two beam momenta: 158 A GeV/{\it c} and 40 A GeV/{\it c}. The value of $dN_{ch}/dη$ at the maximum has been determined and its behaviour as a function of centrality has been studied in the centrality range covered by NA57 (about 50% of the inelastic cross section). The multiplicity increases approximately logarithmically with the centre of mass energy.
description: 19 pages, 8 figures
COMPARATIVE STUDY THE FLEXURAL PROPERTIES AND IMPACT STRENGTH FOR PMMA REINFORCED BY PARTICLES AND FIBERS FOR PROSTHETIC COMPLETE DENTURE BASE
Creators: name: Oleiwi, Jawad K.
Publisher: name: figshare
Year: 2020
Subjects: subject: 110501 Dental Materials and Equipment
subject: FOS: Clinical medicine
subject: 90301 Biomaterials
subject: FOS: Medical engineering
subject: 91299 Materials Engineering not elsewhere classified
subject: FOS: Materials engineering

description: In the present search, attempts are made to develop the properties of PMMA resin that used for upper and lower prosthesis complete denture, by addition two different types of particles, which included: nano-hydroxyapatite (nHA) particles and micro-zirconia (ZrO2) particles that added with different volume fractions of (1%, 2% and 3%) to poly methyl methacrylate (PMMA) cold cured resin as new fluid resin matrix. Also woven glass fiber kind (E-glass) and woven Kevlar fiber kind (49), it were added with a fixed volume fraction of (5%) to PMMA composites. In this work the composite prosthetic dentures specimens preparation was done by using (Hand Lay-Up) method as six groups which includes: the first group consists of PMMA resin reinforced by nHA particles, the second group consists of PMMA resin reinforced by ZrO2 particles, the third group consists of (PMMA-nHA) and glass fiber layer as laminated composite , the fourth group consists of (PMMA-ZrO2) and glass fiber layer, the fifth group consists of (PMMA-nHA) and Kevlar fiber layer and the sixth group consists of (PMMA-ZrO2) and Kevlar fiber layer. The experimental part of this study included performing many mechanical tests which, includes (Flexural, Maximum Shear Stress and Impact) tests. The result of this study showed the values of most properties increased with increasing of the volume fraction of (nHA and ZrO2) particles in polymer composite materials. While, the impact strength decreased. The ZrO2 particle and woven mat Kevlar fiber had shown greater values for the most composite materials properties for all groups’ specimens except the flexural strain. Also the results showed the maximum values for hybrid laminated composite properties (flexural modulus and impact strength) were obtained in hybrid laminated composite materials for sixth group specimens. While, the maximum value for properties (flexural strength and max shear stress) were obtained in hybrid laminated composite materials for fourth group specimens.
THE FORMATION OF EXPECTATIONS AND THE DEMAND FOR CAPITAL (UNCERTAINTY, RISK, INVESTMENT)
Creators: name: Peterson, John F.
Publisher: name: American University
Year: 2023

description: This study uses the pattern of business investment expenditures in fixed plant and equipment as the focal point of a test of two possible ways in which firms form expectations about the future. Fixed investment was used because the anticipated profitability of an investment, and therefore the decision to invest, is crucially dependent upon forecasting method used by the firm. There are basically three aspects to the study. First, is a derivation that acknowledges the existence of uncertainty, an investment function is developed which reflects how investment expenditures are dependent upon: (a) expected, or forecasted, values of relative prices, tax parameters, interest rates, and the general level of demand, (b) the level of uncertainty regarding the ability of the firm to forecast well, and (c) the degree to which forecasts are borne out by events. Then two sets of forecasted values are collected for the 1971 to 1984 period. One set is based on a sophisticated "trending out" method, in which the forecasted values of each economic variable is based solely on the history of the variable itself. The second set of forecasted values is the history of the forecasts of Wharton Econometric Forecasting Associates. The Wharton forecast method utilizes an econometric model which is based largely on Keynesian theory, and therefore it represents the prevailing Keynesian view of the behavior of the economy. The third step was the use of the forecasted values as explanatory values in a regression analysis of investment to determine which of the two sets of forecast values, given the specification of the investment function determined in the first step, best explain the pattern of investment expenditures in the 1970s and early 80s. The forecast data set with the best explanatory value is the set that best corresponds to the forecast method that is used by firms. The results indicated both that the specification of the investment function was appropriate, and that firms use a forecasting method that includes much more information than a simple trending of historical data. This implies that the coefficients of investment equations based on historical data alone are erroneous, and that the use of such equations to evaluate proposed investment policies is misleading.
SENTIERI DI INCONTRO Il Tratturo e la Transumanza
Creators: name: Pazienza, Gianfranco Eugenio
Publisher: name: figshare
Year: 2022
Subjects: subject: 150606 Tourist Behaviour and Visitor Experience
subject: FOS: Economics and business
subject: 70101 Agricultural Land Management
subject: FOS: Other agricultural sciences
subject: 70203 Animal Management
subject: FOS: Animal and dairy science

description: SENTIERI DI INCONTRO Il Tratturo e la Transumanza è un racconto breve scritto per il Concorso Letterario “Il Tratturo Magno” - L’Aquila 9 ottobre 2021Attraversare l'Italia de La "polpa e l'osso", cicatrice inferta alla montagna, metafora dell'anatomia economica italiana definizione coniata dall'economista agrario Manlio Rossi Doria: l'osso dei cordoni montuosi (alpi e dorsale appenninica) - duro da colonizzare e poco appetibile alle varie iniziative industriali. Montagna sempre più spogliata di scuole, di medicina del territorio, di servizi sociali. Montagna abbandonata e invecchiata - ora preda dello sviluppo selvaggio di “foreste di torri eoliche” e dimenticata dallo sviluppo di nuove infrastrutture (...)
 L'abbandono come le frane e le fratture sismiche, sono cicatrici della stessa ferita: l'italia che si é dapprima "auto" saccheggiata e ora, con molta fatica e scarsi investimenti, tenta di investire per recuperare i numerosi Centri storici che, seppur recuperati o in via di un difficile recupero, immersi in paesaggi incantati, restano abbandonati perché spogli di tutto il resto. Montagna rassegnata, avendo a lungo rinunciato alle sue generazioni migliori e alla ricchezza inestimabile di produzioni genuine e di autentica squisitezza. Di salute naturale - oggi riscoperta dopo due anni di pandemia e di confinamento in casa.
STABILITY OF STUDENT EVALUATION OF INSTRUCTOR PERFORMANCE OVER TIME
Creators: name: Varn, Celita Blevins
Publisher: name: American University
Year: 2023

description: The main hypothesis of this research was concerned with the stability over time of student ratings of instructor performance. The secondary hypothesis predicted that there would be exceptions to general stability of ratings in classes in which enrollment was small and in which unconventional instructional methods were used. The Student Instructional Report (SIR), an Educational Testing Service instrument originally validated at Northwestern University, was administered in 23 American University course sections in the fall of 1983 and in the spring of 1984 at the beginning and the end of each course. Student evaluations were matched, and paired t statistics were computed to determine if ratings were similar for the first administration (after four hours of instruction) compared to the second administration near the end of the course. The stability over time of early and late ratings was upheld. This was especially true for the organizational scale of the rating instrument, but for overall ratings, as well. Chi-square computations confirmed that smaller classes, those with 20 or fewer enrollees, and those classes with the greater variance from the conventional lecture-discussion methods were more likely to reflect rating instability--change in student opinion. Recommendations were that both practitioners and researchers take advantage of the stability of early student ratings to improve instruction.
The WISSH quasars project VII. The impact of extreme radiative field in the accretion disk and X-ray corona interplay
Creators: name: Zappacosta, L.
name: Piconcelli, E.
name: Giustini, M.
name: Vietri, G.
name: Duras, F.
name: Miniutti, G.
name: Bischetti, M.
name: Bongiorno, A.
name: Brusa, M.
name: Chiaberge, M.
name: Comastri, A.
name: Feruglio, C.
name: Luminari, A.
name: Marconi, A.
name: Ricci, C.
name: Vignali, C.
name: Fiore, F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Hyperluminous quasars ($L_{\rm bol}\gtrsim 10^{47}$ erg s$^{-1}$) are ideal laboratories to study the interaction and impact of extreme radiative field and the most powerful winds in the AGN nuclear regions. They typically exhibit low coronal X-ray luminosity ($L_{\rm X}$) compared to the UV and MIR radiative outputs ($L_{\rm UV}$ and $L_{\rm MIR}$) with a non-negligible fraction of them reporting even $\sim$1 dex weaker $L_{\rm X}$ compared to the prediction of the well established $L_{\rm X}$-$L_{\rm UV}$ and $L_{\rm X}$-$L_{\rm MIR}$ relations followed by the bulk of the AGN population. We report in our WISE/SDSS-selected Hyperluminous (WISSH) $z=2-4$ broad-line quasar sample, the discovery of a dependence between the intrinsic 2-10 keV luminosity ($L_{\rm 2-10}$) and the blueshifted velocity of the CIV emission line ($v_{\rm CIV}$) indicative of accretion disc winds. In particular, sources with fastest winds ($v_{\rm CIV}\gtrsim 3000~\rm km s^{-1}$) possess $\sim$0.5-1 dex lower $L_{\rm 2-10}$ than sources with negligible $v_{\rm CIV}$. No similar dependence is found on $L_{\rm UV}$, $L_{\rm MIR}$, $L_{\rm bol}$, photon index and absorption column density. We interpret these findings in the context of accretion disc wind models. Both magnetohydrodynamic and line-driven models can qualitatively explain the reported relations as a consequence of X-ray shielding from the inner wind regions. In case of line-driven winds, the launch of fast winds is favoured by a reduced X-ray emission, and we speculate that these winds may play a role in directly limiting the coronal hard X-ray production.
description: 10 pages (including Appendix), 4 figures. Astronomy & Astrophysics Letters in press. Title numbering changed to match the published version
Medical Center Officers' Club Mess Terme di Agnano
Creators: name: Creator not identified.
Publisher: name: DigitalHub. Galter Health Sciences Library & Learning Center
Year: 1944
Subjects: subject: World War II
subject: 12th General Hospital
subject: Souvenirs
subject: Frederick C. Hoebel
subject: Military Personnel
subject: Hospitals, Military
subject: Officers' clubs
subject: Membership cards
subject: Naples (Italy)

description: Medical Center Officers' Club Mess ID card issued to Captain Hoebel.
STABILITY OF STUDENT EVALUATION OF INSTRUCTOR PERFORMANCE OVER TIME
Creators: name: Varn, Celita Blevins
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3904
subject: Specialist studies in education

description: The main hypothesis of this research was concerned with the stability over time of student ratings of instructor performance. The secondary hypothesis predicted that there would be exceptions to general stability of ratings in classes in which enrollment was small and in which unconventional instructional methods were used. The Student Instructional Report (SIR), an Educational Testing Service instrument originally validated at Northwestern University, was administered in 23 American University course sections in the fall of 1983 and in the spring of 1984 at the beginning and the end of each course. Student evaluations were matched, and paired t statistics were computed to determine if ratings were similar for the first administration (after four hours of instruction) compared to the second administration near the end of the course. The stability over time of early and late ratings was upheld. This was especially true for the organizational scale of the rating instrument, but for overall ratings, as well. Chi-square computations confirmed that smaller classes, those with 20 or fewer enrollees, and those classes with the greater variance from the conventional lecture-discussion methods were more likely to reflect rating instability--change in student opinion. Recommendations were that both practitioners and researchers take advantage of the stability of early student ratings to improve instruction.
Inner Boundary Condition in Quasi-Lagrangian Simulations of Accretion Disks
Creators: name: Dempsey, Adam M.
name: Muñoz, Diego
name: Lithwick, Yoram
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In simulations of viscously evolving accretion disks, the inner boundary condition is particularly important. If treated incorrectly, it induces incorrect behavior very quickly, because the viscous time is shortest near the inner boundary. Recent work has determined the correct inner boundary in Eulerian simulations. But in quasi-Lagrangian simulations (e.g., SPH, moving mesh, and mesh-less), where the inner boundary is modeled by removing mass within a finite zone, the inner density profile typically becomes anomalously depleted. Here we show how the boundary condition should be applied in such codes, via a simple modification of the usual approach: when one removes mass, one must speed up the remaining material so that the disk's angular momentum is unchanged. We show with both 1D and 2D moving-mesh (AREPO) simulations that this scheme works as desired in viscously evolving disks. It produces no spurious density depletions and is independent of the mass removal rate, provided that the disk is adequately resolved and that the mass removal rate is not so extreme as to trigger instabilities. This "torque-free" mass removal technique permits the use of quasi-Lagrangian codes to simulate viscously evolving disks, while including a variety of additional effects. As an example, we apply our scheme to a 2D simulation of an accretion disk perturbed by a very massive planet, in which the disk is evolved to viscous steady state.
description: 10 pages, 5 figures, Accepted to ApJL
SEMI-INTELLIGENT COMPUTER ASSISTED INSTRUCTION MODEL (CAI, CBE (COMPUTER-BASED EDUCATION), CAL (COMPUTER-ASSISTED LEARNING), CBI (COMPUTER-BASED INSTRUCTION))
Creators: name: Baya'a, Nimer Fayez
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3901
subject: Curriculum and pedagogy

description: Different approaches have controlled the use of computers as an instructional tool. Among those approaches are the traditional Computer Assisted Instruction (CAI) approach; the LOGO philosophy; and the Intelligent Computer Assisted Instruction (ICAI) systems. Each of these approaches has its own strengths and weaknesses. This study introduces a new approach by providing a new model that can be used to construct educational software. The new model, Semi-Intelligent Computer Assisted Instruction, uses some of the strengths of the existing approaches and compromises on others to remedy the more crippling weaknesses. The major goal was to construct more intelligent programs than the traditional ones, while keeping the construction process as less expensive than that of ICAI programs. An example of how a SICAI model would direct the construction of an educational program (teaching how to solve a quadratic equation) was included in this study. The program was written and tested with a sample of fifty users. Then a statistical analysis was performed. The statistical analysis tested the null hypothesis that the program did not improve the ability of its users in solving quadratic equations; also introduced was a method of using a statistical analysis of the program to indicate changes to be done to improve the program. The program improved significantly the performance of its users; most of the objectives set up for the SICAI model were fulfilled. Also the method for analyzing the performance of the program to suggest changes for improving it was suitable and successful.
Dynamics of ferromagnetic nanomagnets with vortex or single-domain configuration
Creators: name: Killinger, A.
name: Höllinger, R.
name: Krey, U.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study the dynamics of flat circular permalloy nanomagnets for 1.) magnetic vortex and 2.) single-domain configurations, using micromagnetic simulation. Dynamical studies for isolated vortex structures show that both the vorticity and the central polarity of the out-of-plane component can be switched fast (50-100 ps) and independently. Micromagnetic simulations of the switching process in thin cylindrical Permalloy (Py) nanoparticles with an initial stable single-domain state show nearly homogeneous single-domain behaviour followed by excitation of spin waves.
description: 2 pages with 3 eps-figures, --> ICM2003 Rome 28.7.-1.8.03, --> JMMM
Selecting and Designing Grippers for an Assembly Task in a Structured Approach
Creators: name: Xu, Jingren
name: Wan, Weiwei
name: Koyama, Keisuke
name: Domae, Yukiyasu
name: Harada, Kensuke
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: In this paper, we present a structured approach to selecting and designing a set of grippers for an assembly task. Compared to current experience-based gripper design method, our approach accelerates the design process by automatically generating a set of initial design options on gripper type and parameters according to the CAD models of assembly components. We use mesh segmentation techniques to segment the assembly components and fit the segmented parts with shape primitives, according to the predefined correspondence between primitive shape and gripper type, suitable gripper types and parameters can be selected and extracted from the fitted shape primitives. Moreover, we incorporate the assembly constraints in the further evaluation of the initially obtained gripper types and parameters. Considering the affordance of the segmented parts and the collision avoidance between the gripper and the subassemblies, applicable gripper types and parameters can be filtered from the initial options. Among the applicable gripper configurations, we further optimize number of grippers for performing the assembly task, by exploring the gripper that is able to handle multiple assembly components during the assembly. Finally, the feasibility of the designed grippers is experimentally verified by assembling a part of an industrial product.
The relationship between noise and privacy in UBC students' study spaces and reported stress levels
Creators: name: Frackiewicz, Martina
name: Kim, Kate
name: Sandhu, Aman
name: Uy, Ellyce
Publisher: name: The University of British Columbia
Year: 2016

description: We examined whether reported noise and privacy levels in University of British Columbia’s (UBC) students’ study spaces on campus are related to their levels of perceived stress through a quasi-experimental study. Data from N=101 UBC students were gathered through a survey at 3 different locations on campus: Irving K. Barber Learning Commons (IKBLC) Commons, IKBLC Silent Study, and Koerner Cubicles. As predicted, students studying in study spaces with higher noise and lower privacy levels (IKBLC Commons) reported higher levels of stress compared to students studying in spaces with lower noise and higher privacy levels (Koerner Cubicles). We found a moderate positive relationship between reported noise and stress levels and a moderate negative relationship between reported privacy and stress levels. Implications and limitations of the study are discussed, along with recommendations for UBC. 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.”
Effect of Reinforcement Material on Fatigue Characteristics of Trans-tibial Prosthetic Socket with PMMA Matrix
Creators: name: Oleiwi, Jawad K.
Publisher: name: figshare
Year: 2020
Subjects: subject: 90301 Biomaterials
subject: FOS: Medical engineering
subject: 91202 Composite and Hybrid Materials
subject: FOS: Materials engineering
subject: 91299 Materials Engineering not elsewhere classified

description: In this work, Five varieties of reinforcing materials (fibers and particles) were each laminated separately with PMMA matrix used for manufacturing trans-tibial prosthetic socket and fabricated using vacuum molding technique. The tensile and fatigue properties of Five trans-tibial prosthetic sockets were studied experimentally, theoretically and by using finite element method (Ansys-11). Results showed that the weakest laminate based on mechanical strength (Tensile strength and Fatigue limit) was [PMMA+8Perlon layers]composite and the highest mechanical strength was found in [PMMA+(3Perlon+2(Carbon +Glass)+3Perlon) layers] composite. Results of finite element method and theoretical calculation also indicate that the [PMMA+(3Perlon+2(Carbon +Glass)+3Perlon) layers] composite has the highest safety factor and the lowest values of both (deformation and failure index) making that composite the best candidate to give better fatigue characteristics of trans-tibial prosthetic socket.
Localization anisotropy and complex geometry in two-dimensional insulators
Creators: name: Mera, Bruno
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The localization tensor is a measure of distinguishability between insulators and metals. This tensor is related to the quantum metric tensor associated with the occupied bands in momentum space. In two dimensions and in the thermodynamic limit, it defines a flat Riemannian metric over the twist-angle space, topologically a torus, which endows this space with a complex structure, described by a complex parameter $τ$. It is shown that the latter is a physical observable related to the anisotropy of the system. The quantity $τ$ and the Riemannian volume of the twist-angle space provide an invariant way to parametrize the flat quantum metric obtained in the thermodynamic limit. Moreover, if by changing the couplings of the theory, the system undergoes quantum phase transitions in which the gap closes, the complex structure $τ$ is still well defined, although the metric diverges (metallic state), and it is fixed by the form of the Hamiltonian near the gap closing points. The Riemannian volume is responsible for the divergence of the metric at the phase transition.
description: 7 pages; closer to published version