bluuebunny/crossref_metadata_2025_split huggingface dataset:
Technical Systems Development Risk Factors: The Role of Empowering Leadership in Lowering Developers’ Stress
Authors: Windeler Jaime B. , Maruping Likoebe , Venkatesh Viswanath 
Published: September 2017

The success of information systems development (ISD) projects depends on the developers who deliver them. However, developers face many challenges in bringing an ISD project to successful completion. These projects are often large and highly complex, with volatile targets, creating a stressful environment for developers. Although prior literature has considered how technical ISD risk factors, such as project size, complexity, and target volatility, affect team- and project-level outcomes, their effects on developers have received limited attention. This gap in the literature is problematic for two reasons: (1) the interplay between developers and project characteristics are unaccounted for, resulting in an incomplete picture of ISD; and (2) developer stress has been shown to reduce team performance. In this research, we examine the role of empowering leadership in reducing developer stress in ISD. We develop a multilevel model of the effect of empowering leadership on the relationship between technical ISD risk factors and developers’ role perceptions, and explore the consequences for developers’ stress. The model was tested in a field study of 350 developers in 73 ISD teams from a large U.S.-based firm. Results showed that empowering leadership ameliorated the negative effects of project size and target volatility on role ambiguity as well as the negative effects of project size, complexity, and target volatility on role conflict and stress. We also found that empowering leadership reduced role ambiguity, role conflict, and stress directly, and that role ambiguity and role conflict increased stress. Project size, complexity, and target volatility were found to increase empowering leadership behaviors. We conclude that empowering leadership can be an effective means of helping developers cope with technical ISD risk factors and discuss the implications of our findings for research and practice. The online appendix is available at https://doi.org/10.1287/isre.2017.0716 .
Final Demand for Structured Finance Securities
Authors: Merrill Craig B. , Nadauld Taylor D. , Strahan Philip E. 
Published: September 2017

Structured finance boomed during the run-up to the 2008 financial crisis. Highly rated, structured securities offered higher yield than other similarly rated bonds because of their concentration of systematic risk, but regulatory capital requirements did not account for this risk. As a result, regulated entities facing capital constraints had an incentive to invest in them. We show that life insurance companies exposed to unrealized losses from low interest rates in the early 2000s increased their holdings of highly rated securitized assets, consistent with regulatory arbitrage distorting the demand to hold these assets. This paper was accepted by Amit Seru, finance.
Maxing Out Globally: Individualism, Investor Attention, and the Cross Section of Expected Stock Returns
Authors: Cheon Yong-Ho , Lee Kuan-Hui 
Published: September 2017

We examine the role of cultural difference in the pricing of positive extreme returns (MAX) for 47,000 stocks from 42 countries from 1990 to 2012. We find that investors overpay for stocks with high MAX and that MAX-premium, the spread from long-short strategy based on low- and high-MAX stocks, is both statistically and economically significant worldwide. The negative relation between idiosyncratic volatility and expected returns, or idiosyncratic volatility puzzle, exists only for stocks with high MAX, implying that the puzzle may arise from the overpayment for stocks with high MAX and the subsequent return reversal. Consistent with the expectation that overpayment will be stronger for overconfident investors, the MAX-premium is larger in countries with high individualism index (IDV) than it is in countries with low IDV. Furthermore, we find the MAX-premium to be larger and the difference in the MAX-premium between high- and low-IDV countries to be more pronounced when VIX and volatility are high. Our findings suggest that the attention-grabbing feature of stocks with high MAX affects the pricing of extreme positive returns asymmetrically depending on the cultural differences across countries. This paper was accepted by Lauren Cohen, finance.
Tail Analysis Without Parametric Models: A Worst-Case Perspective
Authors: Lam Henry , Mottet Clementine 
Published: September 2017

A common bottleneck in evaluating extremal performance measures is that, because of their very nature, tail data are often very limited. The conventional approach selects the best probability distribution from tail data using parametric fitting, but the validity of the parametric choice can be difficult to verify. This paper describes an alternative based on the computation of worst-case bounds under the geometric premise of tail convexity, a feature shared by all common parametric tail distributions. We characterize the optimality structure of the resulting optimization problem, and demonstrate that the worst-case convex tail behavior is in a sense either extremely light tailed or extremely heavy tailed. We develop low-dimensional nonlinear programs that distinguish between the two cases and compute the worst-case bound. We numerically illustrate how the proposed approach can give more reliable performances than conventional parametric methods.The online appendix is available at https://doi.org/10.1287/opre.2017.1643 .
El pH de la carne de cobayo (Cavia porcellus) procedente del manejo deficiente del bienestar animal durante el sacrificio en la sierra central del Perú
Authors: LUCAS Juan R , BALCAZAR-NAKAMATSU Stephanie , TIRADO Oliver , RODRIGUEZ GUTIERREZ Alejandro 
Published: September 2017

En la región andina del Perú es común observar el sacrificio de los cobayos sin aturdimiento ni descanso ante mortem. El objetivo del presente estudio fue evaluar el pH de la carne de cobayo (Cavia porcellus) resultante de este manejo. Se evaluó el pH de 60 canales a las 0, 1, 6, 12, y 24 h posteriores al sacrificio sin descanso ante mortem ni aturdimiento. El pH fue de 6.79 ± 0.3, 6.74 ± 0.34, 6.59 ± 0.28, 6.45 ± 0.35 y 5.96 ± 0.11, a la 0, 1, 6, 12 y 24 horas post sacrificio respectivamente. La ecuación que representa la evolución del pH fue Y=6.7765-0.0231X-0.0005X2 (R2=0.996).
JOGO DOS ERROS: MOTIVOS PELOS QUAIS UM ARTIGO É ACEITO OU REJEITADO PELOS PERIÓDICOS CIENTÍFICOS
Authors: Oliveira Anselmo Gomes de , Silveira Damaris 
Published: September 2017

Receber de um editor a informação de que seu artigo submetido, embora apresente mérito, não será publicado; ou, simplesmente, ter seu texto rejeitado pelo periódico a que foi submetido, não é uma questão de fácil aceitação. A dúvida mais frequente é “Onde foi que errei?”.
PREVALÊNCIA DE TOXOCARÍASE E FATORES ASSOCIADOS EM CRIANÇAS DE UMA ESCOLA PÚBLICA EM BELO HORIZONTE, MINAS GERAIS, BRASIL
Authors: Campos Ludmilla Parreiras , Carvalho Elaine Alvarenga de Almeida , Soares Gabriela de Moraes , Chagas Júnea , Costa Kênia da Silva , Reis Edna Afonso , Scaini Carlos James , Silveira Micheline Rosa 
Published: September 2017

Tem sido demostrada uma alta prevalência de toxocaríase em diferentes países do mundo, principalmente nos países tropicais. Dessa forma o objetivo desse estudo foi estimar a prevalência de toxocaríase e seus fatores associados em cem crianças de uma escola pública de Belo Horizonte, Brasil. Foram coletadas informações sociodemográficas, hábitos de estilo de vida, condições de saúde autorreferida, características relacionadas à moradia e à presença de animais domésticos. Também foram realizados exames clínicos, medidas antropométricas e exames laboratoriais (hemograma, IgG total, IgE total e ELISA para detecção de anticorpos IgG anti-Toxocara canis). Entre as crianças avaliadas 15% apresentaram sorologia positiva para toxocaríase. Os participantes com resultados positivos e os negativos foram comparados por teste T para duas amostras ou Teste de Mann-Whitney e apenas o parâmetro IgG total foi estatisticamente diferente entre eles. Entre os avaliados com sorologia positiva, as variáveis idade, presença de filhotes, contato com terra e status de IMC (magreza) mostraram-se significativamente associadas. Essas variáveis foram incluídas em um modelo de regressão logística múltiplo, para identificar os fatores associados, de forma independente, com a variável resposta. O nível de significância adotado no modelo final foi de 0,05. Permaneceram no modelo final o contato com terra e o status de IMC com valores p 0,025 e 0,030, respectivamente. Uma prevalência epidemiologicamente significativa de toxocaríase foi encontrada na população estudada, o que serve como alerta para que medidas de controle da doença sejam divulgadas e implementadas.
AVALIAÇÃO DA IMPLANTAÇÃO DE BUSCA ATIVA DE REAÇÕES ADVERSAS A MEDICAMENTOS COM AUXÍLIO DE FERRAMENTAS INFORMATIZADAS
Authors: Bretas Janaína Martins , Silva Maria das Dores Graciano , NASCIMENTO Mariana Martins Gonzaga 
Published: September 2017

O objetivo do presente trabalho foi avaliar a implantação de estratégias de busca ativa de reações adversas a medicamentos (RAM) com o auxílio de ferramentas informatizadas em um programa de farmacovigilância de um hospital privado de grande porte. O desenvolvimento do estudo se deu em três fases: I – implantação do serviço de farmacovigilância (vigilância passiva – notificação voluntária intensificada); II – busca ativa com base em relatórios gerenciais de consumo de medicamentos rastreadores; III – busca ativa com base no preenchimento de formulários vinculados à prescrição de medicamentos rastreadores. Foram analisadas todas as RAM detectadas pelo serviço por três anos e meio (n = 542). A diferença entre as taxas de RAM/100 pacientes-dia foi analisada por meio de teste de comparação de duas proporções, com nível de significância de 5% e poder de 80%. A taxa de RAM/100 paciente-dia encontrada na fase II e III (0,26 e 0,15, respectivamente), ou seja, após a implementação das ferramentas informatizadas, foi superior àquela detectada na fase I (0,10). A diferença entre as proporções foi estatisticamente significativa. A maioria das RAM identificadas apresentou gravidade moderada (69%) e observou-se a elevação desta proporção após a implantação das ferramentas informatizadas. Quanto ao perfil de relação causal, 83,6% das RAM identificadas se enquadravam no critério de “causalidade possível”. A implantação da busca ativa utilizando ferramentas informatizadas proporcionou um aumento na identificação de RAM estatisticamente significativo, reforçando a necessidade de intensificar tais estratégias de farmacovigilância.
PERFIL FITOQUÍMICO, SUSCEPTIBILIDADE ANTIBACTERIANA E CAPACIDADE ANTIOXIDANTE DAS FOLHAS DE Croton urucurana Baillon (Euphorbiaceae)
Authors: Silva Sarah Caroline de Souza , Alves Mônica Alcântara , De Sousa Sabrina Araujo , Nogueira José Ribamar de Souza , Martins Diegue Henrique Nascimento , Fonseca-Bazzo Yris Maria , Galdos-Riveros Alvaro Carlos 
Published: September 2017

Croton urucurana Baillon, espécie conhecida popularmente como “sangria d’água”, pertence à família Euphorbiaceae, possui grande importância na medicina popular, a qual lhe atribui propriedades antibacterianas, anti-inflamatórias, antissépticas, antivirais, antidiarreicas, antissecretória intestinal e cicatrizante. Os objetivos deste estudo foram verificar a presença, nos extratos aquoso, etanólico e hidroalcoólico, de metabolitos secundários (alcaloides, antraquinonas, esteroides/triterpenoides, flavonoides, glicosídeos, saponinas e taninos), analisar a inibição do crescimento das bactérias Staphylococcus aureus ATCC 25923 e Salmonella thyphimurium ATCC 14028, e verificar a atividade antioxidante através do método DPPH. Para o perfil fitoquímico o melhor extrato foi o aquoso, quanto à susceptibilidade bacteriana, houve inibição com o extrato etanólico e o extrato com a maior atividade antioxidante foi o hidroalcóolico, apresentando IC50 1,3 μg/mL. Considerando os resultados obtidos no estudo, foi possível concluir que os extratos da Croton urucurana Baillon apresentam resultados interessantes e que mais investigações devem ser realizadas para a elucidação aprimorada dos seus benefícios.
Effect of alkan-1-ols on the structure of dopc model membrane
Authors: Kondela T. , Gallová J. , Hauß T. , Ivankov O. , Kučerka N. , Balgavý P. 
Published: September 2017

Abstract
The effect of general anaesthetics alkan-1-ols (CnOH, where n = 10, 12, 14, 16 and 18 is the number of carbon atoms in the molecule) on the structure of dioleoylphosphatidylcholine (DOPC) model membrane was studied by small-angle neutron scattering (SANS) and small-angle neutron diffraction (SAND). Fluid bilayers were prepared at CnOH:DOPC = 0.3 molar ratio. The results of both the experiments show that bilayer thickness - a thickness parameter dg in the case of SANS and lamellar repeat distance D in the case of SAND - increases with increasing n. A coexistence of two lamellar phases with different D was detected by measuring the C18OH+DOPC oriented sample.
Unveil the traces of ancient mining
Authors: Brocchini Debora , Deravignone Luca , Dellavalle Gianni 
Published: September 2017

Abstract
The Archaeological Mines Park of San Silvestro is part of the Campiglia mining area. It represents its most important historical core. The Park covers a surface of around 450 hectares on the mountains Calvi, Rombolo, Poggio all’Aione and along the valleys Temperino, Lanzi and Manienti. The main characteristic of the Park is the richness of mining activity traces towards copper, lead and silver. The mining activity started during the 7th century BC with the Etruscan civilization and continued until 1979, when the last mine was closed. Many karst cavities of the Campiglia are “cave-mines’: they are the result of a natural event and the action of ancient miners, who searched metalliferous minerals. In Campiglia there are traces of hundreds of Etruscan, medieval and modern mining operations, tunnels from the 19th and 20th centuries. The aim of the Archaeological and Mining park of San Silvestro is to highlight historical landscape, the result of centuries of mining activities. Some of the buildings, originally used for productive and administrative purposes, have been restored to house exhibitions and services for visitors. The impressive ruins of the medieval village of San Silvestro and two of the modern mining tunnels, have been equipped for guided tours. The accessibility of ancient mining works is however still difficult and this represents a limit in the enhancement and protection of these sites. Speleologists, archaeologists and geologists will be involved in making a project to let everyone discover the most ancient underground mines. We have three main targets: (1) produce high quality pictures of the most interesting and impressive mining traces; (2) create 3D models useful for scientific and cultural purposes; (3) equip some of the ancient shafts with light structures to allow small groups to visit them. We will describe the morphological characteristics of one of these ancient mines, giving some advice for the production of high quality picture in this contest. We will also describe the technique used for the production of a 3D model and how to equip the mine for the visit of small groups of people.
A numerical solution for a class of time fractional diffusion equations with delay
Authors: Pimenov Vladimir G. , Hendy Ahmed S. 
Published: September 2017

Abstract
This paper describes a numerical scheme for a class of fractional diffusion equations with fixed time delay. The study focuses on the uniqueness, convergence and stability of the resulting numerical solution by means of the discrete energy method. The derivation of a linearized difference scheme with convergence order O(τ
2−α+ h
4) in L∞-norm is the main purpose of this study. Numerical experiments are carried out to support the obtained theoretical results.
Exact null controllability, complete stabilizability and continuous final observability of neutral type systems
Authors: Rabah Rabah , Sklyar Grigory , Barkhayev Pavel 
Published: September 2017

Abstract
For abstract linear systems in Hilbert spaces we revisit the problems of exact controllability and complete stabilizability (stabilizability with an arbitrary decay rate), the latter property being related to exact null controllability. We also consider the case when the feedback is not bounded. We obtain a characterization of complete stabilizability for neutral type systems. Conditions for exact null controllability of neutral type systems are discussed. By duality, we obtain a result about continuous final observability. Illustrative examples are given.
The controllability of nonlinear implicit fractional delay dynamical systems
Authors: Joice Nirmala Rajagopal , Balachandran Krishnan 
Published: September 2017

Abstract
This paper is concerned with the controllability of nonlinear fractional delay dynamical systems with implicit fractional derivatives for multiple delays and distributed delays in control variables. Sufficient conditions are obtained by using the Darbo fixed point theorem. Further, examples are given to illustrate the theory.
Accurate gradient computations at interfaces using finite element methods
Authors: Qin Fangfang , Wang Zhaohui , Ma Zhijie , Li Zhilin 
Published: September 2017

Abstract
New finite element methods are proposed for elliptic interface problems in one and two dimensions. The main motivation is to get not only an accurate solution, but also an accurate first order derivative at the interface (from each side). The key in 1D is to use the idea of Wheeler (1974). For 2D interface problems, the point is to introduce a small tube near the interface and propose the gradient as part of unknowns, which is similar to a mixed finite element method, but only at the interface. Thus the computational cost is just slightly higher than in the standard finite element method. We present a rigorous one dimensional analysis, which shows a second order convergence order for both the solution and the gradient in 1D. For two dimensional problems, we present numerical results and observe second order convergence for the solution, and super-convergence for the gradient at the interface.
Feedback linearization of an active magnetic bearing system operated with a zero–bias flux
Authors: Mystkowski Arkadiusz , Kaparin Vadim , Kotta Ülle , Pawluszewicz Ewa , Tõnso Maris 
Published: September 2017

AbstractInput-output linearization by state feedback is applied to a flux-controlled active magnetic bearing (AMB) system, operated in the zero-bias mode. Two models of the AMB system are employed. The first one is described by the third-order dynamics with a flux-dependent voltage switching scheme, whereas the second one is the fourth-order system, called self-sensing AMB, since it does not require the measurement of the rotor position. In the case of that system we had to find the flat outputs to guarantee its stability. The proposed control schemes are verified by means of numerical simulations performed within the Matlab environment.
Is an interval the right result of arithmetic operations on intervals?
Authors: Piegat Andrzej , Landowski Marek 
Published: September 2017

Abstract
For many scientists interval arithmetic (IA, I arithmetic) seems to be easy and simple. However, this is not true. Interval arithmetic is complicated. This is confirmed by the fact that, for years, new, alternative versions of this arithmetic have been created and published. These new versions tried to remove shortcomings and weaknesses of previously proposed options of the arithmetic, which decreased the prestige not only of interval arithmetic itself, but also of fuzzy arithmetic, which, to a great extent, is based on it. In our opinion, the main reason for the observed shortcomings of the present IA is the assumption that the direct result of arithmetic operations on intervals is also an interval. However, the interval is not a direct result but only a simplified representative (indicator) of the result. This hypothesis seems surprising, but investigations prove that it is true. The paper shows what conditions should be satisfied by the result of interval arithmetic operations to call it a “result”, how great its dimensionality is, how to perform arithmetic operations and solve equations. Examples illustrate the proposed method of interval computations.
A column generation technique for routing and spectrum allocation in cloud–ready survivable elastic optical networks
Authors: Goścień Róża , Walkowiak Krzysztof 
Published: September 2017

Abstract
Driven by increasing user requirements and expectations, the fast development of telecommunications networks brings new challenging optimization problems. One of them is routing and spectrum allocation (RSA) of three types of network flows (unicast, anycast, multicast) in elastic optical networks (EONs) implementing dedicated path protection (DPP). In the paper, we model this problem as integer linear programming (ILP) and we introduce two new optimization approaches—a dedicated heuristic algorithm and a column generation (CG)-based method. Then, relying on extensive simulations, we compare algorithm performance with reference methods and evaluate CG efficiency in detail. The results show that the proposed CG method significantly outperforms reference algorithms and achieves results very close to optimal ones (the average distance to optimal results was at most 2.1%).
Reduced Analgesics Consumption and Pain Intensity after Injections with a New Hyaluronic Acid in Patients with Knee Osteoarthritis
Authors: Russu Octav Marius , Feier Andrei Marian , Pop Tudor Sorin , Todoran Marcela , Gergely István 
Published: September 2017

Abstract

Objective: To determine the influence of a new intraarticular hyaluronic acid based hydrogel (Hymovis®) injections on the amount of analgesics consumption in patients diagnosed with primary knee OA.

Methods: A prospective, single-center study that included 35 patients, aged 45-80 years was conducted in our orthopaedics department. Patients received two intra-articular injections of hyaluronic acid (24 mg/3 ml; 500–730 kDa; Hymovis®) at one week apart. Follow-up was scheduled at 2 and 6 months after the injections. Assessment tools included Visual Analogue Scale (VAS) and an in-house designed questionnaire regarding analgesic consumption (quantity, period and product) during the follow-up.

Results: Compared to baseline, a significant amelioration in visual analogue scale was observed at six months’ follow-up (74.2mm ± 11.7 vs. 57.3mm ± 12.1; p <.0001). 28% (n=10) of the patients reduced their total analgesic consumption at two months after the injections. At final follow-up, the analgesic intake was reduced by more than 50% in almost every case.

Conclusions: Intraarticular administered injections with a novel hyaluronan-based hydrogel (Hymovis®) may reduce the amount of analgesic consumption and self-reported pain intensity in patients with knee OA.