cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Analysis of Busy-Time Scheduling on Heterogeneous Machines
Creators: name: Liu, Mozhengfu
name: Tang, Xueyan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: This paper studies a generalized busy-time scheduling model on heterogeneous machines. The input to the model includes a set of jobs and a set of machine types. Each job has a size and a time interval during which it should be processed. Each job is to be placed on a machine for execution. Different types of machines have distinct capacities and cost rates. The total size of the jobs running on a machine must always be kept within the machine's capacity, giving rise to placement restrictions for jobs of various sizes among the machine types. Each machine used is charged according to the time duration in which it is busy, i.e., it is processing jobs. The objective is to schedule the jobs onto machines to minimize the total cost of all the machines used. We develop an $O(1)$-approximation algorithm in the offline setting and an $O(μ)$-competitive algorithm in the online setting (where $μ$ is the max/min job length ratio), both of which are asymptotically optimal.
description: Extended version of a paper that will appear in ACM SPAA '21 conference
Quantum cryptography with finite resources: unconditional security bound for discrete-variable protocols with one-way post-processing
Creators: name: Scarani, Valerio
name: Renner, Renato
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We derive a bound for the security of QKD with finite resources under one-way post-processing, based on a definition of security that is composable and has an operational meaning. While our proof relies on the assumption of collective attacks, unconditional security follows immediately for standard protocols like Bennett-Brassard 1984 and six-states. For single-qubit implementations of such protocols, we find that the secret key rate becomes positive when at least N\sim 10^5 signals are exchanged and processed. For any other discrete-variable protocol, unconditional security can be obtained using the exponential de Finetti theorem, but the additional overhead leads to very pessimistic estimates.
تشظيات البدايات: سؤال الانحطاط ونضوج الانبعاث الشعري - كامل فرحان صالح - مجلة الحداثة ISSN: 2790-1785
Creators: name: Saleh, Kamel farhan
name: صالح, كامل فرحان
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 470521
subject: Middle Eastern literature

description: مستخلص عن بحث: تشظيات البدايات: سؤال الانحطاط ونضوج الانبعاث الشعريالبروفسور كامل فرحان صالح - kamel farhan salehيسعى هذا البحث إلى معالجة قضية تبيان الحدود الفاصلة بين مرحلتي ما يسمّى "عصر الانحطاط" وما يسمّى عصر النهضة العربية، كذلك الحدود بين الانبعاث والنهضة والحديث، محاولاً البحث في الموضوع من خلال العودة إلى عدد من الموضوعات التاريخية والأدبية المعنيّة. ويستكمل البحث المعالجة عبر الوقوف على أبرز عوامل الانبعاث والنهضة ومدى أثر حملة القائد الفرنسي نابليون بونابرت (Napoléon Bonaparte/ 1769 – 1821) على مصر في العام 1798، وما تبع هذه الحملة من عومل أثّرت في المشهد العربي على غير صعيد، فضلا عمّا أنتجته الحملة من ردود أفعال واتجاهات ومبادئ أدبية، ولاسيما النظرة إلى الشعر العربي.- الكلمات المفاتيح: النهضة الأدبية، عصر الانحطاط، حملة نابليون، مفهوم الشعرمنشور في: مجلة الحداثة (Al Hadatha) ع. 227 - س. 30 - ربيع Spring 2023ISSN: 2790-1785DOI: 10.6084/m9.figshare.24718446
Analysis of the Dynamical Environment characterising the USV FTB_1 Vehicle performing the first DTFT Mission
Creators: name: Russo, Michelangelo
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: The successfully realisation of a microgravity experiment, whatever its objective could be, necessarily requires a dynamical characterisation of the environment in which it takes place as complete and precise as possible. This is due to the strong influence of the levels of acceleration reached on the results of the experiment; without a detailed set of information about the former, it will not be possible a correct interpretation of the latter.
This thesis concerns the analysis of the gravity level that is possible to realise during the first mission of the Unmanned Space Vehicle (USV) developed by the Italian Aerospace Research Centre (CIRA), in the framework of the Italian National Aerospace Research Program (PRORA).
The Flying Test Bed 1 (FTB_1) is a slender, not-propelled winged vehicle, able to perform experiments in areas such as Structure and Aeroelasticity, Autonomous Guidance Navigation and Control and Thermo-Aerodynamics.
The purpose of this thesis is to verify if it could be possible to consider the FTB_1 as exploitable also for microgravity experimentation.
Reinforcement Learning Based Sparse Black-box Adversarial Attack on Video Recognition Models
Creators: name: Wang, Zeyuan
name: Sha, Chaofeng
name: Yang, Su
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: We explore the black-box adversarial attack on video recognition models. Attacks are only performed on selected key regions and key frames to reduce the high computation cost of searching adversarial perturbations on a video due to its high dimensionality. To select key frames, one way is to use heuristic algorithms to evaluate the importance of each frame and choose the essential ones. However, it is time inefficient on sorting and searching. In order to speed up the attack process, we propose a reinforcement learning based frame selection strategy. Specifically, the agent explores the difference between the original class and the target class of videos to make selection decisions. It receives rewards from threat models which indicate the quality of the decisions. Besides, we also use saliency detection to select key regions and only estimate the sign of gradient instead of the gradient itself in zeroth order optimization to further boost the attack process. We can use the trained model directly in the untargeted attack or with little fine-tune in the targeted attack, which saves computation time. A range of empirical results on real datasets demonstrate the effectiveness and efficiency of the proposed method.
description: Accepted as a conference paper of IJCAI-21 (the 30th International Joint Conference on Artificial Intelligence)
Day surgery: evoluzione tecnica, organizzativa ed economica alla luce della vigente normativa
Creators: name: Zappacosta, Riccardo
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Negli ultimi 15 anni si è assistito ad una continua crescita della day o ambulatory surgery, la cui caratteristica è rappresentata dal fatto che si effettuano interventi senza il ricovero notturno. In Italia lo sviluppo della day-surgery non trova una diffusione simile a quella dei paesi anglosassoni, infatti circa il 20% degli interventi viene trattato in tale regime. Ciò è dovuto a diversi fattori:
•la confusa legislazione riguardante la materia che determina uno stato di incertezza sia negli operatori che negli utenti;
•il pregiudizio culturale che impedisce la diffusione nella mentalità collettiva della disciplina di day-surgery. Esso è frutto sia della disinformazione, sia della convinzione che rapidità sia sinonimo di minore precisione;
•la ancora scarsa confidenza delle nostre strutture pubbliche con il sistema del DRG’s che abolisce i rimborsi a degenza per trasferirli sul costo delle prestazioni.
In Italia vi sono linee guida necessarie per l’accreditamento dell’unità di day surgery, ma mancano linee guida basate sulle regole migliori che riguardano pre-admission e admission care da presentare ai pazienti nell’unità di day surgery. Né vi sono linee guida che possano migliorare e rendere più appropriato il livello dello staff dedicato alla day surgery. Nonostante la presenza di questi deterrenti, fattori politici (il cambiamento della concezione di stato sociale), economici (l’impulso delle assicurazioni e della sanità privata) e di progresso medico scientifico stanno fortunatamente spingendo anche l’Italia verso un sempre maggiore utilizzo della day-surgery. Il presente lavoro, attraverso l’analisi dello sviluppo della normativa nazionale e regionale, rappresenta uno strumento per poter ottimizzare il processo di sviluppo della day-surgery con una regolamentazione univoca. In aggiunta, con lo sviluppo e la creazione di un percorso assistenziale specifico per la day-surgery si potrebbe aumentare il grado di razionalità e di utilizzo di tali procedure. Infatti, l’implementazione del percorso assistenziale porterebbe ad un miglioramento della qualità delle prestazioni, sia dal punto di vista della gestione interna che della soddisfazione del paziente. Inoltre, il lavoro viene completato attraverso l’analisi economica di una specifica  patologia attraverso l’utilizzo del “percorso del paziente”, strumento utile al riconoscimento del costo speciale di produzione della patologia in esame, che confrontato con il ricavo DRG’s, permette di definire il ricavo netto della singola prestazione.
Francis D. Moulton
Creators: name: (:Unas)
Publisher: name: Unknown
Year: 1870
Subjects: East Hampton
Photographs
Cabinet photographs
Portrait photographs
Portraits
Mustaches

description: This image shows a portrait of Francis D. Moulton with a handlebar mustache. This photograph is part of a collection of photographs found in the ceiling of 140A Main Street, now 138, in East Hampton in 1970. This collection was donated by Joan Osborne in April 1995.
Kerr-de Sitter Black Hole Revisited
Creators: name: Ovalle, J.
name: Contreras, E.
name: Stuchlik, Z.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We interpret the cosmological constant as the energy of the vacuum, and under a minimum amount of assumptions, we show that it is deformed in the vicinity of a black hole. This leads us to reexamine the Kerr-de Sitter solution. We provide a new solution, simpler and geometrically richer, which shows the impact of the rotation in form of a warped curvature. We carry out a detailed and exact study on the new black hole solution, and we conclude with a conjecture regarding the possible impact of our results on alternative theories.
description: 7 pages, 2 figures
Danno ossidativo nell’ipertiroidismo funzionale indotto dal freddo
Creators: name: De Rosa, Raffaella
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Le analisi effettuate in questo lavoro permettono di avere una più chiara visione degli effetti dell’ipermetabolismo indotto dall’esposizione, a basse temperature, sul danno ossidativo del tessuto epatico di ratto. Il danno ossidativo si verifica come conseguenza dello sbilanciamento del rapporto antiossidanti/proossidanti in favore dei proossidanti. I principali proossidanti presenti nelle cellule sono rappresentati dalle forme parzialmente ridotte dell’ossigeno (ROS) che si formano durante il normale metabolismo aerobico e contro le quali, le cellule si difendono grazie alla presenza di un complesso sistema antiossidante. In una prima fase delle ricerche, è stato dimostrato che l’aumento delle capacità ossidative, necessario per la sopravvivenza degli organismi omeotermi in ambienti a basse temperatura, ha come effetto collaterale dannoso l’aumento degli indici di danno ossidativo tessutale ed anche l’aumento della suscettibilità agli insulti ossidativi.
All’aumento del danno ossidativo epatico contribuisce un aumento della produzione mitocondriale di ROS, per tale motivo, sono stati poi analizzati gli effetti del esposizione a freddo per periodi di due e dieci giorni, sulla produzione mitocondriale di ROS, sul danno ossidativo mitocondriale e sulla suscettibilità allo stress ossidativo. Tale studio ha permesso di dimostrare che in seguito all’esposizione a freddo nei mitocondri si verifica un aumento della produzione di ROS, dell’entità del danno ossidativo e della loro suscettibilità agli insulti ossidativi. Particolarmente interessante è risultata l’osservazione che i mitocondri isolati dal fegato di animali esposti a freddo, sono molto sensibili agli insulti di natura ossidativa, e presumibilmente, alla eliminizazione da parte della cellula tramite mitoptosi. Questo potrebbe essere un meccanismo che limita il danno ossidativo tessutale indotto dal freddo, in quanto, mediante tale sistema, potrebbero essere rimossi dalle cellule i mitocondri che producono una maggiore quantità di ROS.
Inoltre poiché la popolazione mitocondriale è eterogenea è possibile mediante centrifugazione differenziale, isolare a 1000, 3000 e 10000 g tre popolazioni, M1, M3 ed M10, aventi caratteristiche biochimiche, funzionali e morfologiche diverse e in grado di produrre ROS a velocità diverse e dunque studiarne gli effetti indotti dall’esposizione a basse temperature.
Lo studio effettuato su tali frazioni ha consentito di dimostrare che la percentuale dei mitocondri funzionalmente efficienti, ma che producono ROS con velocità relativamente elevata, si riduce in seguito all’esposizione a freddo.
Anomaly Detection via Controlled Sensing and Deep Active Inference
Creators: name: Joseph, Geethu
name: Zhong, Chen
name: Gursoy, M. Cenk
name: Velipasalar, Senem
name: Varshney, Pramod K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we address the anomaly detection problem where the objective is to find the anomalous processes among a given set of processes. To this end, the decision-making agent probes a subset of processes at every time instant and obtains a potentially erroneous estimate of the binary variable which indicates whether or not the corresponding process is anomalous. The agent continues to probe the processes until it obtains a sufficient number of measurements to reliably identify the anomalous processes. In this context, we develop a sequential selection algorithm that decides which processes to be probed at every instant to detect the anomalies with an accuracy exceeding a desired value while minimizing the delay in making the decision and the total number of measurements taken. Our algorithm is based on active inference which is a general framework to make sequential decisions in order to maximize the notion of free energy. We define the free energy using the objectives of the selection policy and implement the active inference framework using a deep neural network approximation. Using numerical experiments, we compare our algorithm with the state-of-the-art method based on deep actor-critic reinforcement learning and demonstrate the superior performance of our algorithm.
description: 6 pages,9 figures
Nature inspired Optimization Algorithms for Classification and Regression Trees
Creators: name: Miele, Raffaele
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: During the past 10 years Computational Statistics techniques' importance has been always increasing and it is actually still doing. This is due to more than one factor. On one side, the technological growth of the last decades has made computational power and storage capacity incredibly affordable and accessible. In particular, the storage capacity has improved much more than the computational resources. This resulted in an unbalanced situation in which there are huge masses of data but there is not (and, probably, there won't be for a long time) enough computing power to exhaustively process it. On one side, it is always more widely felt the need of extracting knowledge from databases, being such phase considered as a critical activity in many decision making processes. Such databases are actually considered as great potential knowledge repositories in a dormant state. Computational Statistics and, more properly, Data Mining techniques are, probably, the unique way to extract such knowledge from the forementioned raw data sources and this explains the always growing interest around such methodologies. This has led Data Mining to meet other research fields like machine learning, operation research and, more in general artificial intelligence. One of the actually biggest problem that many Data Mining techniques have to deal with is combinatorial optimization that, in the past, has led many techniques to be taken apart and, now, makes them applicable only within certain bounds. Since other research fields like Artificial Intelligence have being (and still are) dealing with such problems, their contribute to statistics (and viceversa) has been very significative. An indicator of this phenomenon could be the introduction of Neural Networks in Statistics. This thesis tries to go in this direction, in particularly about the use of Nature inspired optimization algorithms, which have been proven to be powerful instruments for attacking many combinatorial optimization problems, when exhaustive enumeration and evaluation of all possible candidate solution to a problem is not computationally affordable. In particular, Nature inspired algorithms have been designed for attacking the combinatorial optimization problems that affects Classification and Regression Trees algorithms, which are considered powerful instruments for knowledge extraction and decision making support. A Java software for quickly building Classification and Regression Trees (by using a very fast procedure) has also been written to fulfill the need for a flexible framework to support the research for developing the nature inspired algorithms. A Forward Search-based methodology has also been proposed to improve the stability of the Trees.
Cone-Copositive Lyapunov Functions for Complementarity Systems: Converse Result and Polynomial Approximation
Creators: name: Souaiby, Marianne
name: Tanwani, Aneel
name: Henrion, Didier
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: This article establishes the existence of Lyapunov functions for analyzing the stability of a class of state-constrained systems, and it describes algorithms for their numerical computation. The system model consists of a differential equation coupled with a set-valued relation which introduces discontinuities in the vector field at the boundaries of the constraint set. In particular, the set-valued relation is described by the subdifferential of the indicator function of a closed convex cone, which results in a cone-complementarity system. The question of analyzing stability of such systems is addressed by constructing cone-copositive Lyapunov functions. As a first analytical result, we show that exponentially stable complementarity systems always admit a continuously differentiable cone-copositive Lyapunov function. Putting some more structure on the system vector field, such as homogeneity, we can show that the aforementioned functions can be approximated by a rational function of cone-copositive homogeneous polynomials. This later class of functions is seen to be particularly amenable for numerical computation as we provide two types of algorithms for precisely that purpose. These algorithms consist of a hierarchy of either linear or semidefinite optimization problems for computing the desired cone-copositive Lyapunov function. Some examples are given to illustrate our approach.
Spin transport in magnetic multilayers
Creators: name: Akabli, K.
name: Diep, H. T.
name: Reynal, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study by extensive Monte Carlo simulations the transport of itinerant spins travelling inside a multilayer composed of three ferromagnetic films antiferromagnetically coupled to each other in a sandwich structure. The two exterior films interact with the middle one through non magnetic spacers. The spin model is the Ising one and the in-plane transport is considered. Various interactions are taken into account. We show that the current of the itinerant spins going through this system depends strongly on the magnetic ordering of the multilayer: at temperatures $T$ below (above) the transition temperature $T_c$, a strong (weak) current is observed. This results in a strong jump of the resistance across $T_c$. Moreover, we observe an anomalous variation, namely a peak, of the spin current in the critical region just above $T_c$. We show that this peak is due to the formation of domains in the temperature region between the low-$T$ ordered phase and the true paramagnetic disordered phase. The existence of such domains is known in the theory of critical phenomena. The behavior of the resistance obtained here is compared to a recent experiment. An excellent agreement with our physical interpretation is observed. We also show and discuss effects of various physical parameters entering our model such as interaction range, strength of electric and magnetic fields and magnetic film and non magnetic spacer thicknesses.
description: 8 pages, 17 figures, submitted to J. Phys.: Cond Matter
Solids circulation rate measurement in a circulating fluidized bed
Creators: name: Burkell, James J.
Publisher: name: University of British Columbia
Year: 2010

description: This thesis documents the investigation of three methods of determining solids fluxes in a circulating fluidized bed (CFB). An impact flowmeter used the force of the recirculating particles striking a pan which spanned the diameter of the return column to measure solids circulation rates. A modified orifice, with a conical entrance section, used the additional pressure differential resulting from solids flowing counter-currently to gas to determine solids fluxes. The third method used the velocities of particles travelling through the vertical section of an L-valve to determine solids circulation rates. The results obtained in this work show that the impact flowmeter and the method utilizing L-valve particle velocities are viable methods of measuring solids fluxes in a CFB. However, further research is required before these methods can be confidently used. The modified orifice, as studied, was not sensitive enough to sense solids circulation. However, the meter may offer potential if studied with co-current gas solids flow.
Managing uncertainties and development of grain legumes in Sweden
Creators: name: Östberg Jenny
Publisher: name: Zenodo
Year: 2019
Subjects: Crop diversification; legume crops; transition; agroecology; supply chains

description: This the a bachelor's thesis co-supervised within the framework of the European DiverIMPACTS project in the context of a Swedish case-study (number 19). Grain legumes have proven in many studies to have beneficial effects on both the agricultural system and for human health. Agronomic and environmental benefits with the lower use of synthetic nitrogen, improvement of soil health, and contribution towards a more diverse agricultural system has alongside with the high nutritional value proven the grain legumes importance of presence. Inspite of all these benefits, the presence of grain legumes for human consumption in the cropping systems in Sweden is relatively small. The purpose of this study was therefore to get a better understanding of why grain legumes are not more commonly cultivated and consumed in Sweden, and identify ways to overcome the challenges. Through semi-structured interviews with actors working in the cultivation and trading of pea and lentil for human consumption in Sweden, the experiences for managing grain legume yield variability and factors causing uncertainty was explored, as well as the future vision for developing and increasing yellow dry pea and lentil cultivation and consumption. The main factors causing variability and uncertainty among the farmers and traders in this study were: consumer demand, economic incentives and subsidies, variable weather conditions, few available varieties suitable for human consumption and cultivation in Sweden, difficulty in post-harvest processing and limited areas of use. With further research of pea and lentil varieties suitable for human consumption in Sweden, public subsidies for domestic cultivation of grain legumes, and more actors working with processing and creating new products with grain legumes, the factors causing uncertainty and variability would decline and cultivation area and consumption of peas and lentils for human consumption in Sweden could increase.
A Scalable Algorithm for Anomaly Detection via Learning-Based Controlled Sensing
Creators: name: Joseph, Geethu
name: Gursoy, M. Cenk
name: Varshney, Pramod K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We address the problem of sequentially selecting and observing processes from a given set to find the anomalies among them. The decision-maker observes one process at a time and obtains a noisy binary indicator of whether or not the corresponding process is anomalous. In this setting, we develop an anomaly detection algorithm that chooses the process to be observed at a given time instant, decides when to stop taking observations, and makes a decision regarding the anomalous processes. The objective of the detection algorithm is to arrive at a decision with an accuracy exceeding a desired value while minimizing the delay in decision making. Our algorithm relies on a Markov decision process defined using the marginal probability of each process being normal or anomalous, conditioned on the observations. We implement the detection algorithm using the deep actor-critic reinforcement learning framework. Unlike prior work on this topic that has exponential complexity in the number of processes, our algorithm has computational and memory requirements that are both polynomial in the number of processes. We demonstrate the efficacy of our algorithm using numerical experiments by comparing it with the state-of-the-art methods.
description: 6 pages, 8 figures
The Agricultural Economy of Somalia
Creators: name: Treakle, H. Charles
name: Treakle, H. Charles
Publisher: name: Unknown
Year: 1971
Subjects: subject: Crop Production/Industries
subject: International Development
subject: International Relations/Trade
subject: Livestock Production/Industries
subject: Marketing
subject: FOS: Economics and business
subject: Somalia
subject: Agricultural production
subject: Trade
subject: Bananas
subject: Sugar
subject: Livestock

description: Basically an agrarian and pastoral country, Somalia is nearly self-sufficient in good crop years. But frequent recurring droughts cause food imports to average a quarter or more of total imports over time. Livestock support a large proportion of the population and since 1967 have been the major export item. Bananas (the second largest export) and sugarcane are the principal cash crops. Banana production provides a livelihood for about a quarter of the settled population. Staples of the Somali diet are sorghum, milk, meat, pulses, vegetables, and fruit. Principal food imports are cereals, cereal preparations, fruits and vegetables, and sugar. Chief foods imported from the United States are cereals and vegetable oils; chief exports to the United States are hides and skins. With external assistance, development projects have been aimed at agriculture through the introduction of new crops, diversification, expansion of irrigation, and improvement of marketing facilities and infrastructure.
Social heterogeneity and the COVID-19 lockdown in a multi-group SEIR model
Creators: name: Dolbeault, Jean
name: Turinici, Gabriel
Publisher: name: Zenodo
Year: 2020

description: The goal of the lockdown is to mitigate and if possible prevent the spread of an epidemic. It consists in reducing social interactions. This is taken into account by the introduction of a factor of reduction of social interactions q, and by decreasing the transmission coefficient of the disease accordingly. Evaluating q is a difficult question and one can ask if it makes sense to compute an average coefficient q for a given population, in order to make predictions on the basic reproduction rate R0, the dynamics of the epidemic or the fraction of the population that will have been infected by the end of the epidemic. On a very simple example, we show that the computation of R0 in a heterogeneous population is not reduced to the computation of an average q but rather to the direct computation of an average coefficient R0. Even more interesting is the fact that, in a range of data compatible with the Covid-19 outbreak, the size of the epidemic is deeply modified by social heterogeneity, as is the height of the epidemic peak, while the date at which it is reached mainly depends on the average R0 coefficient. This paper illustrates more technical results that can be found in [4], with new numerical computations. It is intended to draw the attention on the role of heterogeneities in a population in a very simple case, which might be difficult to apprehend in more realistic but also more complex models.
Henry Ward Beecher
Creators: name: (:Unas)
Publisher: name: Unknown
Year: 1870
Subjects: East Hampton
Photographs
Cabinet photographs
Portrait photographs
Portraits

description: This image shows a portrait of Henry Ward Beecher. This photograph is part of a collection of photographs found in the ceiling of 140A Main Street, now 138, in East Hampton in 1970. This collection was donated by Joan Osborne in April 1995.
Broken Pencils and Moving Rulers: After an unpublished book by Mitchell Feigenbaum
Creators: name: Eckmann, Jean-Pierre
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Physics (physics.class-ph)
subject: Mathematical Physics (math-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences
subject: 97D40

description: Mitchell Feigenbaum discovered an intriguing property of viewing images through cylindrical mirrors or looking into water. Because the eye is a lens with an opening of about 5mm, many different rays of reflected images reach the eye, and need to be interpreted by the visual system. This has the surprising effect that what one perceives depends on the orientation of the head, whether it is tilted or not. I explain and illustrate this phenomenon on the example of a human eye looking at a ruler immersed in water.
description: Accepted for American Journal of Physics
A GMRT multifrequency radio study of the isothermal core of the poor galaxy cluster AWM 4
Creators: name: Giacintucci, S.
name: Vrtilek, J. M.
name: Murgia, M.
name: Raychaudhury, S.
name: O'Sullivan, E. J.
name: Venturi, T.
name: David, L. P.
name: Mazzotta, P.
name: Clarke, T. E.
name: Athreya, R. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a detailed radio morphological study and spectral analysis of the wide-angle-tail radio source 4C +24.36 associated with the dominant galaxy in the relaxed galaxy cluster AWM 4. Our study is based on new high sensitivity GMRT observations at 235 MHz, 327 MHz and 610 MHz, and on literature and archival data at other frequencies. We find that the source major axis is likely oriented at a small angle with respect to the plane of the sky. The wide-angle-tail morphology can be reasonably explained by adopting a simple hydrodynamical model in which both ram pressure (driven by the motion of the host galaxy) and buoyancy forces contribute to bend the radio structure. The spectral index progressively steepens along the source major axis from $α\sim$0.3 in the region close to the radio nucleus to beyond 1.5 in the lobes. The results of the analysis of the spectral index image allow us to derive an estimate of the radiative age of the source of $\sim$ 160 Myr. The cluster X-ray emitting gas has a relaxed morphology and short cooling time, but its temperature profile is isothermal out to at least 160 kpc from the centre. Therefore we seek evidence of energy ejection from the central AGN to prevent catastrophic cooling. We find that the energy injected by 4C +24.36 in the form of synchrotron luminosity during its lifetime is far less than the energy required to maintain the high gas temperature in the core. We also find that it is not possible for the central source to eject the requisite energy in the intracluster gas in terms of the enthalpy of buoyant bubbles of relativistic fluid, without creating discernible large cavities in the existing X-ray XMM-Newton observations.
description: 15 pages, 12 figures, accepted for publication in ApJ
Maria Hedges
Creators: name: (:Unas)
Publisher: name: Unknown
Year: 1870
Subjects: East Hampton
Photographs
Cabinet photographs
Portrait photographs
Portraits
Tintypes

description: This image shows a tintype portrait of Maria Hedges dressed in black. This photograph is part of a collection of photographs found in the ceiling of 140A Main Street, now 138, in East Hampton in 1970. This collection was donated by Joan Osborne in April 1995.
Comparazione di modelli fisico-matematici di previsione meteorologica: applicazione sul territorio Campano
Creators: name: Di Cristo, Raffaele
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: L’aumento di eventi meteorologici estremi che ha interessato il territorio campano negli ultimi anni ed i conseguenti danni da essi causati ha portato ad una crescente attenzione verso i problemi connessi alla previsione meteorologica. Nel presente studio vengono esaminate le metodologie impiegate nella previsione atmosferica assistita da modelli numerici (NWP, Numerical Weather Prediction), con una particolare attenzione ai principi fisici ed ai metodi di parametrizzazione in essi impiegati; inoltre, viene presentato un semplice modello numerico sviluppato nel corso dello stesso studio ed usato, insieme con i dati messi a disposizione dall’Osservatorio Meteorologico del Dipartimento di Geofisica e Vulcanologia dell’Università di Napoli “Federico II”, per la previsione di alcuni eventi piovosi verificatisi nel corso del 2005.
Binary Blends of Diblock Copolymers: An Efficient Route to Complex Spherical Packing Phases
Creators: name: Xie, Jiayu
name: Li, Yu
name: Shi, An-Chang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The phase behaviour of binary blends composed of A$_1$B$_1$ and A$_2$B$_2$ diblock copolymers is systematically studied using the polymeric self-consistent field theory, focusing on the formation and relative stability of various spherical packing phases. The results are summarized in a set of phase diagrams covering a large phase space of the system. Besides the commonly observed body-centered-cubic (BCC) phase, complex spherical packing phases including the Frank-Kasper A15 and $σ$ and the Laves C14 and C15 phases could be stabilized by the addition of longer A$_2$B$_2$-copolymers to asymmetric A$_1$B$_1$-copolymers. Stabilizing the complex spherical packing phases requires that the added A$_2$B$_2$-copolymers have a longer A-block and an overall chain length at least comparable to the host copolymer chains. A detailed analysis of the block distributions reveals the existence of inter- and intra-domain segregation of different copolymers, which depends sensitively on the copolymer length ratio and composition. The predicted phase behaviours of the A$_1$B$_1$/A$_2$B$_2$ diblock copolymer blends are in good agreement with available experimental and theoretical results. The study demonstrated that binary blends of diblock copolymers provide an efficient route to regulate the emergence and stability of complex spherical packing phases.
Spin, charge and single-particle spectral functions of the one-dimensional quarter filled Holstein model
Creators: name: Assaad, F. F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use a recently developed extension of the weak coupling diagrammatic determinantal quantum Monte Carlo method to investigate the spin, charge and single particle spectral functions of the one-dimensional quarter-filled Holstein model with phonon frequency $ω_0 = 0.1 t$. As a function of the dimensionless electron-phonon coupling we observe a transition from a Luttinger to a Luther-Emery liquid with dominant $2k_f$ charge fluctuations. Emphasis is placed on the temperature dependence of the single particle spectral function. At high temperatures and in both phases it is well accounted for within a self-consistent Born approximation. In the low temperature Luttinger liquid phase we observe features which compare favorably with a bosonization approach retaining only forward scattering. In the Luther-Emery phase, the spectral function at low temperatures shows a quasiparticle gap which matches half the spin gap whereas at temperatures above which this quasiparticle gap closes, characteristic features of the Luttinger liquid model are apparent. Our results are based on lattice simulations on chains up to L=20 for two-particle properties and on CDMFT calculations with clusters up to 12 sites for the single-particle spectral function.
description: 10 pages, 9 figures
Kinetics and mechanism of hydrogenolysis of a ruthenium(II) acyl complex
Creators: name: Joshi, Ajey Madhav
Publisher: name: University of British Columbia
Year: 2010

description: This thesis describes the results of kinetic investigations into the hydrogenolysis of the ruthenium-acyl complex dicarbonylchloro-(norbornenoyDbis(triphenylphosphine)ruthenium(II ),RuCl(CO⋅C₇H₉) (CO) ₂-(PPh₃)₂. 2. N,N-Dimethylacetamide (DMA) and toluene solutions of 2 react with one mole equivalent of H₂ to give HRuCl(CO)₂(PPh₃)₂, 3, and the unsaturated aldehyde product C₇H₉CHO, 4. The subsequent, relatively slow hydrogenation of 4 by a further mole of H₂ to give the saturated aldehyde C₇H₁₁-CHO, 5, was found to be catalyzed by 3. A detailed kinetic study on the hydrogenolysis of 2 in DMA solvent revealed a first-order rate dependence on [Ru][sub Total] an inverse dependence on added [PPh₃], and a first- to zero-order dependence on H₂pressure. The following mechanism is proposed to account for these observations: [See Thesis for Diagram] Values of k₁ and k₋₁/k₂ have been evaluated at 65°C (k₁ = 4.6±0.5x10⁻⁵ s⁻¹ k₋₁/k₂ = 1.7±0.2) and the activation enthalpy and entropy for the k₁ step determined (ΔH[sup ‡] = 69±7 kJmole⁻¹, Δs‡ = -126+13 JK⁻¹ mole⁻¹). New, and as yet incompletely characterized, ruthenium complexes of stoichiometry "RuCl(C₆H₉)(PPh₃)₂”, 6, HRuCl(C₆H₈)(C₆H₉)(PPh₃)₂-benzene solvate", 7, and RuCl₂(C₆H₈)(PPh₃)₂, 8, have been synthesized by the reactions of 1,4-cyclohexadiene (C₆H₈) with HRuCl(PPh₃)₃⋅C₆H₆ (complexes 6 and 7), and RuCl₂ (PPh₃)₃ (complex 8), respectively. Reactions of 6, 7, and 8 in DMA with H₂ and with CO were investigated, and the organic and inorganic products identified: [See Thesis for Diagram]
Convergence of adaptive mixtures of importance sampling schemes
Creators: name: Douc, R.
name: Guillin, A.
name: Marin, J. -M.
name: Robert, C. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: Computation (stat.CO)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 60F05, 62L12, 65-04, 65C05, 65C40, 65C60 (Primary)

description: In the design of efficient simulation algorithms, one is often beset with a poor choice of proposal distributions. Although the performance of a given simulation kernel can clarify a posteriori how adequate this kernel is for the problem at hand, a permanent on-line modification of kernels causes concerns about the validity of the resulting algorithm. While the issue is most often intractable for MCMC algorithms, the equivalent version for importance sampling algorithms can be validated quite precisely. We derive sufficient convergence conditions for adaptive mixtures of population Monte Carlo algorithms and show that Rao--Blackwellized versions asymptotically achieve an optimum in terms of a Kullback divergence criterion, while more rudimentary versions do not benefit from repeated updating.
description: Published at http://dx.doi.org/10.1214/009053606000001154 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Komar Integrals in Higher (and Lower) Derivative Gravity
Creators: name: Kastor, David
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Komar integral relation of Einstein gravity is generalized to Lovelock theories of gravity. This includes, in particular, a new boundary integral for the Komar mass in Einstein gravity with a nonzero cosmological constant, which has a finite result for asymptotically AdS black holes, without the need for an infinite background subtraction. Explicit computations of the Komar mass are given for black holes in pure Lovelock gravities of all orders and in general Gauss-Bonnet theories.
description: 16 pages; v2 - references and comment on relation to Noether charge method added
L’Intangibile in sanità: cultura e clima organizzativo nelle strutture ospedaliere
Creators: name: Fiore, Beatrice
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Il punto di partenza della tesi, è stato riflettere sui cambiamenti economici, istituzionali, tecnologici, culturali e sociali che in questi ultimi anni hanno modificato i parametri e i modelli di riferimento per le aziende sanitarie: assetti aziendalistici normativamente introdotti , la revisione dei ruoli e delle gerarchie di comando e il ricorso a tecniche di amministrazione e controllo di vario tipo (controllo di gestione, contabilità per centri di costi, controllo di qualità, incentivi (seppur deboli) economici, ecc.).  Ciò nonostante, efficienza e performance del settore sanitario, ma anche di molti altri settori di produzione di beni materiali e servizi, non sono soddisfacenti e non sono rari i casi di aziende che non reggono la competizione ed escono dal mercato e di ospedali che continuano a produrre deficit di bilancio e accadimenti vari di cosiddetta malasanità.

La tesi esamina sia in termini teorici che empirici l’analisi e la ricerca dei fattori che possono spiegare e, successivamente, aiutare a massimizzare l’obiettivo dell’efficienza e della performance delle organizzazioni e, nello specifico, delle organizzazioni sanitarie.

L’approccio scelto è quello riconducibile all’ambito teorico che vede nella “cultura” e nel “clima” organizzativo, un forte fattore di determinazione del funzionamento organizzativo. Tale approccio, si configura come un prerequisito per una strategia finalizzata al cambiamento dell’organizzazione fondata su una rimodulazione delle relazioni delle persone che lavorano al suo interno. Il coinvolgimento diretto degli operatori e un’azione diretta a far emergere una cultura ed un clima organizzativo coerente con gli obiettivi dell’organizzazione medesima, può, infatti, a parità di altri fattori, aumentare la probabilità che il cambiamento della realtà lavorativa si verifichi effettivamente e produca risultati positivi.

Una fonte di innovazione, peraltro, è quella che lega i tradizionali studi sulla cultura e il clima organizzativo, al tema della “fiducia” (trust) come presupposto per lo sviluppo “positivo”, sia dell’economia di un paese che del suo benessere sociale, sia del successo aziendale che della soddisfazione dell’utente.
Sequences involving square zig-zag shapes
Creators: name: Németh, László
name: Szalay, László
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11B37, 11Y55, 05C38, 05A10

description: We define a so-called square $k$-zig-zag shape as a part of the regular square grid. Considering the shape as a $k$-zig-zag digraph, we give values of its vertices according to the number of the shortest paths from a base vertex. It provides several integer sequences, whose higher-order homogeneous recurrences are determined by the help of a special matrix recurrence.
description: 13 pages, 4 figures
Alex Huntting and Unidentified Man
Creators: name: (:Unas)
Publisher: name: Unknown
Year: 1870
Subjects: East Hampton
Photographs
Cabinet photographs
Portrait photographs
Portraits
Men

description: This image shows Alex Huntting seated for a portrait with a unidentified man standing to his right. This photograph is part of a collection of photographs found in the ceiling of 140A Main Street, now 138, in East Hampton in 1970. This collection was donated by Joan Osborne in April 1995.
Virtual Environments for Training: From Individual Learning to Collaboration with Humanoids
Creators: name: Gerbaud, Stéphanie
name: Mollet, Nicolas
name: Arnaldi, Bruno
Publisher: name: arXiv
Year: 2007
Subjects: subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences

description: The next generation of virtual environments for training is oriented towards collaborative aspects. Therefore, we have decided to enhance our platform for virtual training environments, adding collaboration opportunities and integrating humanoids. In this paper we put forward a model of humanoid that suits both virtual humans and representations of real users, according to collaborative training activities. We suggest adaptations to the scenario model of our platform making it possible to write collaborative procedures. We introduce a mechanism of action selection made up of a global repartition and an individual choice. These models are currently being integrated and validated in GVT, a virtual training tool for maintenance of military equipments, developed in collaboration with the French company NEXTER-Group.
Rapporti di genere e generazione nelle famiglie di pescatori: il caso di Torre Annunziata e Torre del Greco
Creators: name: Scognamiglio, Antonietta
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Nel lavoro di ricerca, i cui protagonisti sono uomini e donne di tre generazioni appartenenti a famiglie di pescatori, si analizzano i mutamenti sociali in un contesto del Mezzogiorno di Italia focalizzando l’attenzione su  genere, generazione e famiglia.
L’area di studio -quella torrese- risulta storicamente caratterizzata da un peso consistente delle attività della pesca e della marineria all’interno della struttura occupazionale, che hanno mantenuto nel tempo un carattere familiare e una organizzazione basata sulla rigida divisione dei ruoli.
La specificità dei fenomeni studiati ha indotto ad optare per un approccio qualitativo nel lavoro di campo, che è stato condotto attraverso interviste in profondità e la ricostruzione di genealogie familiari.
Venendo all’articolazione del lavoro, esso si compone di due parti: la prima, essenzialmente teorica, presenta le diverse prospettive e le scelte metodologiche relative alla riflessione su genere e generazione e all’uso delle biografie. La seconda, invece, fornisce una descrizione del contesto di riferimento, analizza e confronta i casi famigliari, considera le modalità di apprendimento e trasmissione del mestiere e le conseguenze che essi hanno nell’organizzazione famigliare e sociale e nella comunità.
In particolare ci si sofferma sulle relazioni di genere che rendono possibile svolgere questa attività  e al contempo sul fatto che tali relazioni sono conseguenza diretta di una organizzazione di questo tipo.