bluuebunny/crossref_metadata_2025 huggingface dataset:
Connecting to Global Production Networks: Challenges for Regional Actors in Northern Norway
Authors: Nilsen Trond , Karlstad Stig
Published: May 2016

Over the past few years, Northern Norway has been perceived as a land of opportunity. Announcements of offshore oil and gas discoveries off the coast of Finnmark have contributed to increased market activity in related sectors like service and construction. However, regional firms continue to score at the bottom of innovation indexes and seldom compete on international markets. Based on indepth interviews with representatives from key businesses in three sectors in Northern Norway, we examine the bottlenecks that have prevented these firms from gaining new market positions through the interplay of these regional firms and agencies with the Global Production Network (GPN). We adopt the concept of ‘‘strategic coupling’’ and explore whether an actor approach can contribute to an improved understanding of this relationship. The paper demonstrates that regional strategies and public policy differ between the sectors. Public policy is important for regional firms within the petroleum sector. However, the funds available for regional firms continue to be limited due to the size and relevance of the measures. In the construction sector, public policy instruments are important, but not sufficiently adapted to the challenges these firms face. While the petroleum sector receives support and backing from regional agencies in order to connect to GPN, the wind power sector is actively hindered by the same agencies. The former have the opportunity to take part in new regional path creation; the latter have experienced a lack of strategic cooperation and face the risk of reducing strategic couplings to GPN, leading to path dependent processes that lock these firms into traditional and low-tech sectors.(Published: May 2016)Citation: T. Nilsen and S. Karlstad. “Connecting to Global Production Networks: Challenges for Regional Actors in Northern Norway.” Arctic Review on Law and Politics, Vol. 7, No. 1, 2016, pp. 42–59. http://dx.doi.org/10.17585/arctic.v7.207
APPROACHES TO RESEARCHING BORDER REGIONS: WRITING THE HISTORY OF LATGALIA
Authors: Gibsone Katerine
Published: May 2016

While there has been increasing interest in the history of border regions in recent years, this has not been accompanied by a growing discussion of theoretical or methodological considerations. Using the case study of Latgalia, this paper aims to shed light on some of the conceptual and practical methodological considerations and challenges inherent in writing the history of border regions. The author argues that the study of the history of border regions necessitates a decentring of national history and a move to transnational (or non/a-nationally construed) history.
ALICE: A diffractometer/reflectometer for soft X-ray resonant magnetic scattering at BESSY II
Authors: Abrudan Radu-Marius , Radu Florin
Published: May 2016

Although the chamber named ALICE was designed for the analysis of magnetic hetero- and nanostructures via resonant magnetic x-ray scattering, the instrument is not limited to this technique. Static measurements involve the possibility to use scattering and spectroscopy synchrotron based techniques (photon-in photon-out, photon-in electron-out, and coherent scattering). Dynamic experiments require either laser or magnetic field pulses to excite the spin system followed by x-ray probe in the time domain from nano- to femtosecond delay times. In this temporal range, the demagnetization/remagnetization dynamics and magnetization precession in a number of magnetic materials (metals, alloys, and magnetic multilayers) can be probed in an element specific manner. The versatility of the instrument was tested by a series of pilot experiments, pointing out ALICE as one of the most demanded instruments at the Helmholtz-Zentrum in Berlin.
Quality management in risk based monitoring
Authors: Nayak Veerabhadra Sanekal , Khan Mohammed Saleem , Shukla Bharat Kumar S
Published: May 2016

The essential thought of risk based quality administration is the recognizable proof of risks on a ceaseless premise for risk bearing exercises all through the configuration, behaviour, assessment and reporting of clinical trials. The procedure ought to begin at the season of convention outline so moderation can be incorporated with the convention and other trial related archives. Clinical Research is about creating information to bolster choices for creating and changing medicinal items and rehearses while ensuring the security, rights, prosperity of taking part subjects are ensured and coming about information are dependable. Choice making must be in the same class as the procedures used to deal with the clinical trials. Scholastic and industry driven clinical exploration is gradually adjusting quality danger administration forms for ahead of schedule recognizable proof of components with potential to influence subject wellbeing and convention consistence; preparing for those leading, directing and observing the study; ceaseless re-evaluation of needs; and corrective and preventive action (CAPA). Flawless control of exercises is once in a while conceivable to accomplish, yet a quality controlled and organized danger based methodology can be next best to flawlessness.
Hydra effects in stable communities and their implications for system dynamics
Authors: Cortez Michael H. , Abrams Peter A.
Published: May 2016

A hydra effect occurs when the mean density of a species increases in response to greater mortality. We show that, in a stable multispecies system, a species exhibits a hydra effect only if maintaining that species at its equilibrium density destabilizes the system. The stability of the original system is due to the responses of the hydra‐effect species to changes in the other species’ densities. If that dynamical feedback is removed by fixing the density of the hydra‐effect species, large changes in the community make‐up (including the possibility of species extinction) can occur. This general result has several implications: (1) Hydra effects occur in a much wider variety of species and interaction webs than has previously been described, and may occur for multiple species, even in small webs; (2) conditions for hydra effects caused by predators (or diseases) often differ from those caused by other mortality factors; (3) introducing a specialist or a switching predator of a hydra‐effect species often causes large changes in the community, which frequently involve extinction of other species; (4) harvest policies that attempt to maintain a constant density of a hydra‐effect species may be difficult to implement, and, if successful, are likely to cause large changes in the densities of other species; and (5) trophic cascades and other indirect effects caused by predators of hydra‐effect species can exhibit amplification of effects or unexpected directions of change. Although we concentrate on systems that are originally stable and models with no stage‐structure or trait variation, the generality of our result suggests that similar responses to mortality will occur in many systems without these simplifying assumptions. In addition, while hydra effects are defined as responses to altered mortality, they also imply counterintuitive responses to changes in immigration and other parameters affecting population growth.
Connectivity from a different perspective: comparing seed dispersal kernels in connected vs. unfragmented landscapes
Authors: Herrmann John D. , Carlo Tomás A. , Brudvig Lars A. , Damschen Ellen I. , Haddad Nick M. , Levey Douglas J. , Orrock John L. , Tewksbury Joshua J.
Published: May 2016

Habitat fragmentation can create significant impediments to dispersal. A technique to increase dispersal between otherwise isolated fragments is the use of corridors. Although previous studies have compared dispersal between connected fragments to dispersal between unconnected fragments, it remains unknown how dispersal between fragments connected by a corridor compares to dispersal in unfragmented landscapes. To assess the extent to which corridors can restore dispersal in fragmented landscapes to levels observed in unfragmented landscapes, we employed a stable‐isotope marking technique to track seeds within four unfragmented landscapes and eight experimental landscapes with fragments connected by corridors. We studied two wind‐ and two bird‐dispersed plant species, because previous community‐based research showed that dispersal mode explains how connectivity effects vary among species. We constructed dispersal kernels for these species in unfragmented landscapes and connected fragments by marking seeds in the center of each landscape with 15N and then recovering marked seeds in seed traps at distances up to 200 m. For the two wind‐dispersed plants, seed dispersal kernels were similar in unfragmented landscapes and connected fragments. In contrast, dispersal kernels of bird‐dispersed seeds were both affected by fragmentation and differed in the direction of the impact: Morella cerifera experienced more and Rhus copallina experienced less long‐distance dispersal in unfragmented than in connected landscapes. These results show that corridors can facilitate dispersal probabilities comparable to those observed in unfragmented landscapes. Although dispersal mode may provide useful broad predictions, we acknowledge that similar species may respond uniquely due to factors such as seasonality and disperser behavior. Our results further indicate that prior work has likely underestimated dispersal distances of wind‐dispersed plants and that factors altering long‐distance dispersal may have a greater impact on the spread of species than previously thought.
Modularity, pollination systems, and interaction turnover in plant‐pollinator networks across space
Authors: Carstensen Daniel W. , Sabatino Malena , Morellato Leonor Patricia C.
Published: May 2016

Mutualistic interaction networks have been shown to be structurally conserved over space and time while pairwise interactions show high variability. In such networks, modularity is the division of species into compartments, or modules, where species within modules share more interactions with each other than they do with species from other modules. Such a modular structure is common in mutualistic networks and several evolutionary and ecological mechanisms have been proposed as underlying drivers. One prominent explanation is the existence of pollination syndromes where flowers tend to attract certain pollinators as determined by a set of traits. We investigate the modularity of seven community level plant‐pollinator networks sampled in rupestrian grasslands, or campos rupestres, in SE Brazil. Defining pollination systems as corresponding groups of flower syndromes and pollinator functional groups, we test the two hypotheses that (1) interacting species from the same pollination system are more often assigned to the same module than interacting species from different pollination systems and; that (2) interactions between species from the same pollination system are more consistent across space than interactions between species from different pollination systems. Specifically we ask (1) whether networks are consistently modular across space; (2) whether interactions among species of the same pollination system occur more often inside modules, compared to interactions among species of different pollination systems, and finally; (3) whether the spatial variation in interaction identity, i.e., spatial interaction rewiring, is affected by trait complementarity among species as indicated by pollination systems. We confirm that networks are consistently modular across space and that interactions within pollination systems principally occur inside modules. Despite a strong tendency, we did not find a significant effect of pollination systems on the spatial consistency of pairwise interactions. These results indicate that the spatial rewiring of interactions could be constrained by pollination systems, resulting in conserved network structures in spite of high variation in pairwise interactions. Our findings suggest a relevant role of pollination systems in structuring plant‐pollinator networks and we argue that structural patterns at the sub‐network level can help us to fully understand how and why interactions vary across space and time.
Reproducing static and dynamic biodiversity patterns in tropical forests: the critical role of environmental variance
Authors: Fung Tak , O'Dwyer James P. , Rahman Kassim Abd. , Fletcher Christine D. , Chisholm Ryan A.
Published: May 2016

Ecological communities are subjected to stochasticity in the form of demographic and environmental variance. Stochastic models that contain only demographic variance (neutral models) provide close quantitative fits to observed species‐abundance distributions (SADs) but substantially underestimate observed temporal species‐abundance fluctuations. To provide a holistic assessment of whether models with demographic and environmental variance perform better than neutral models, the fit of both toSADs and temporal species‐abundance fluctuations at the same time has to be tested quantitatively. In this study, we quantitatively test how closely a model with demographic and environmental variance reproduces total numbers of species, total abundances,SADs and temporal species‐abundance fluctuations for two tropical forest tree communities, using decadal data from long‐term monitoring plots and considering individuals larger than two size thresholds for each community. We find that the model can indeed closely reproduce these static and dynamic patterns of biodiversity in the two communities for the two size thresholds, with better overall fits than corresponding neutral models. Therefore, our results provide evidence that stochastic models incorporating demographic and environmental variance can simultaneously capture important static and dynamic biodiversity patterns arising in tropical forest communities.
Native fungal endophytes suppress an exotic dominant and increase plant diversity over small and large spatial scales
Authors: Afkhami Michelle E. , Strauss Sharon Y.
Published: May 2016

Understanding community dynamics and processes, such as the factors that generate and maintain biodiversity, drive succession, and affect invasion susceptibility, is a central goal in ecology and evolution. While most studies of how species interactions affect communities have focused on highly visible macroorganisms, we show that mutualistic microfungal endophytes have community‐level effects across their host plant's range and provide the first example of fungal endophytes enhancing plant diversity. A three‐year field study in which we experimentally manipulated endophyte abundance in a native Californian grass showed that despite their minute biomass, endophytes dramatically increased plant community diversity (~110% greater increase with endophytes) by suppressing a dominant invasive grass, Bromus diandrus. This effect was also detectable, but smaller, across five additional common gardens spanning ecologically diverse habitats, different climates, and >400 km of the host grass’ range as well as at microspatial scales within gardens. Our study illustrates that mutualistic microbes, while often hidden players, can have unexpectedly large ecological impacts across a wide range of habitats and scales and may be important for promoting diverse communities and ecosystems.
Failed and successful intentional introductions of fish species into 821 Swedish lakes
Authors: Henriksson Anna , Rydberg Cecilia , Englund Göran
Published: May 2016

Introductions of fish into lakes can be viewed as whole system experiments, which can be used to study the principles of community assembly and factors determining the outcome of species invasions. Freshwater fish species have been translocated by humans for centuries in Sweden, and this activity has been documented by national and regional authorities starting at the end of the 19th century. Based on this documentation and additional interviews with local fishermen, we have compiled a data set that includes 1157 intentional introductions of 26 freshwater fish species into 821 Swedish lakes. The data include both successful and failed introductions; where a successful introduction means that the introduced fish species was present in the lake for ≥20 yr or that reproduction was observed earlier than that. The oldest introduction is from 1658 and the latest from 2002. Additionally, the data set includes species composition, water temperature sum, maximum water temperature, lake area, elevation, longitude, and latitude for all lakes. These data have been used to test hypotheses about biotic resistance and invasion success in three papers. We found the presence or absence of specific species predicted invasion success better than the species richness of the lakes. We also found that species with high invasion success tend to make a large contribution to biotic resistance, which will make communities more resistant in the future as they are invaded by additional species.
Stoichiometry of microbial carbon use efficiency in soils
Authors: Sinsabaugh Robert L. , Turner Benjamin L. , Talbot Jennifer M. , Waring Bonnie G. , Powers Jennifer S. , Kuske Cheryl R. , Moorhead Daryl L. , Follstad Shah Jennifer J.
Published: May 2016

The carbon use efficiency (CUE) of microbial communities partitions the flow of C from primary producers to the atmosphere, decomposer food webs, and soil C stores. CUE, usually defined as the ratio of growth to assimilation, is a critical parameter in ecosystem models, but is seldom measured directly in soils because of the methodological difficulty of measuring in situ rates of microbial growth and respiration. Alternatively, CUE can be estimated indirectly from the elemental stoichiometry of organic matter and microbial biomass, and the ratios of C to nutrient‐acquiring ecoenzymatic activities. We used this approach to estimate and compare microbial CUE in >2000 soils from a broad range of ecosystems. Mean CUE based on C:N stoichiometry was 0.269 ± 0.110 (mean ± SD). A parallel calculation based on C:P stoichiometry yielded a mean CUE estimate of 0.252 ± 0.125. The mean values and frequency distributions were similar to those from aquatic ecosystems, also calculated from stoichiometric models, and to those calculated from direct measurements of bacterial and fungal growth and respiration. CUE was directly related to microbial biomass C with a scaling exponent of 0.304 (95% CI 0.237–0.371) and inversely related to microbial biomass P with a scaling exponent of −0.234 (95% CI −0.289 to −0.179). Relative to CUE, biomass specific turnover time increased with a scaling exponent of 0.509 (95% CI 0.467–0.551). CUE increased weakly with mean annual temperature. CUE declined with increasing soil pH reaching a minimum at pH 7.0, then increased again as soil pH approached 9.0, a pattern consistent with pH trends in the ratio of fungal : bacteria abundance and growth. Structural equation models that related geographic variables to CUE component variables showed the strongest connections for paths linking latitude and pH to β‐glucosidase activity and soil C:N:P ratios. The integration of stoichiometric and metabolic models provides a quantitative description of the functional organization of soil microbial communities that can improve the representation of CUE in microbial process and ecosystem simulation models.
Editorial
Authors: Farias de Azevedo Marcos Antônio
Published: May 2016

Reflexus 1.
Fé e Tradição: um caminho para o protestantismo brasileiro. Apontamentos para estudo da História do Pensamento Cristão Protestante
Authors: Teixeira Luiz Caetano G.
Published: May 2016

Apresenta-se, de forma bastante simples, a História do Pensamento Cristão, desde os tempos apostólicos até a Reforma e, a partir daí, as principais correntes da Tradição Protestante trazidas pelos missionários que influenciaram as Igrejas brasileiras.Palavras-chave: Protestantismo, Tradição Cristã. Tradição Protestante.
“MEU NOME É LEGIÃO” – UMA LEITURA DE MARCOS 5,1-17 A PARTIR DA AÇÃO LETAL DA LEGIÃO ROMANA
Authors: Solano Rossi Luiz Alexandre
Published: May 2016

Ao utilizar o conceito de imaginário e como ele interfere nos mecanismos da realidade palpável (política, econômica, social, cultural) que alimenta a própria imaginação, este artigo procura interpretar o texto de Marcos 5,1-17 procurando perceber como a expressão “legião” podia ser compreendida pela população palestina diante da ação letal da legião romana. Palavras-chave: Imaginário. Legião Romana. Exorcismo e Libertação.
Apresentação
Authors: Filho José Adriano
Published: May 2016

Apresentação de Reflexus 8.
Do senso comum pedagógico à descoberta da cidadania fraterna: Contribuições da filosofia da educação para a formação inicial do docente de ensino religioso
Authors: E Juliana Pimentel Santos José Raimundo Rodrigues
Published: May 2016

Resumo: O senso comum apresenta-se no meio pedagógico, contribuindo para que preconceitos ou práticas não reflexivas sejam mantidos. Percebe-se que, em relação ao ensino religioso, o senso comum pedagógico oscila entre a rejeição imediata, justificada pelo argumento de uma escola laica, e a defesa obstinada, motivada por tendências proselitistas. Considerando que, futuramente, muitos pedagogos atuarão como professores de ensino religioso, propõe-se nesse artigo analisar algumas contribuições da filosofia da educação na formação inicial deste profissional: senso crítico; capacidade de reflexão e análise da sociedade; comprometimento político; reconhecimento da dimensão religiosa na vida humana. Tais contribuições poderão repensar o ensino religioso como ampla proposta de reconhecimento de práticas e reflexões que tem por objetivo inicial a descoberta de uma cidadania baseada na fraternidade.Palavras-chaves: Filosofia da educação. Ensino religioso. Cidadania fraterna.Abstract: Common sense presents itself in the pedagogical realm contributing to the maintenance of pre-conceptions or non-reflective practices. It is noticed that in relation to religious teaching common sense teaching ranges from the immediate rejection, justified by the argument of a secular school, and the obstinate defense motivated by proselytized tendencies. Considering that many educators will act as teachers of religious education in the future this article aims to examine some contributions of the philosophy of education in the initial formation of such professional: critical thinking, capacity of reflection and society analysis, political commitment, recognition of the religious dimension in human life. Such contributions may review religious education as a wide proposal of the recognition of practices and reflections which initially aims the discovery of a citizenship based on brotherhood.Keywords: Philosophy of Education. Religious Teaching. Fraternal Citizenship.
O ensino religioso em diálogo com o curso de Ciências das Religiões da Universidade Federal da Paraíba
Authors: Eunice Simões Doracy Rocha Lopes Silvania Maria da Silva
Published: May 2016

Resumo: Nosso objetivo consiste em analisar como se encontra o Ensino Religioso em dialogo com as Ciências das Religiões no município de João Pessoa – PB nos dias atuais. Partimos do pressuposto de que o Ensino Religioso assegura o respeito à diversidade cultural religiosa, enquanto as Ciências das Religiões visam compreender o fenômeno religioso em suas dimensões e formar o professor/a para ministrar nas escolas na perspectiva da diversidade cultural religiosa. A metodologia de investigação foi à pesquisa descritiva, bibliográfica e fontes documentais.Palavras-chave: Ensino Religioso. Ciências das Religiões. Formação e Docência.Abstract: Our goal is an analysis of the dialogue between Religious Teaching and Sciences of the Religions in João Pessoa -Paraibanowadays.We start from the assumption that Religious Teaching assures respect for cultural religious diversity, while the Sciences of the Religions seek to comprehend the religious phenomenon in its dimensions. Sciences of Religions also educate teachers for ministering in classroom from the perspective of religious diversity. The research methodology was descriptive research, bibliographic and documentary sources.Keywords: Religious Teaching. Sciences of the Religions. Formation and Teaching.
Ethos e Pathos na constituição do gênero testemunho religioso na mídia
Authors: Souza Ronivaldo Moreira de
Published: May 2016

Resumo: Dado ao lugar central que o Testemunho Religioso ocupa na liturgia das igrejas neopentecostais e o evidente uso que fazem do gênero no contexto midiático como forma de persuasão e adesão de novos fiéis, esta pesquisa se propõe à investigação de como se dá a construção das imagens de si neste gênero de discurso. Para investigação do fenômeno recorre-se aos estudos sobre ethose pathos nos teóricos da Escola Francesa de Análise do Discurso aplicando-os aos testemunhos que a Igreja Universal do Reino de Deus publica em sua página na internet: www.eucreioemmilagres.com.br. Palavras-chave: Ethos.Pathos. Igreja Universal do Reino de Deus. Testemunho religioso.  Abstract:Religious Testimony occupies a central place in the liturgy of neo-Pentecostal churches and the genre is widely used in the media context as a form of persuasion and accession of new believers. So, this article aims to investigate how is the construction of the images of themselves in this kind of discourse. In order to do that, it investigates the phenomenon through the study of ethos and pathos in theorists of the French School of Discourse Analysis by applying them to the testimonies the Universal Church of the Kingdom of God published on its websitewww.eucreioemmilagres.com.br. Keywords: Ethos. Pathos. Universal Church of the Kingdom of God. Religious Testimony
“Poor in Spirit”: Economy in the Gospel of Matthew
Authors: Buttelli Felipe Gustavo Koch
Published: May 2016

Este artigo apresenta um importante assunto para a reflexão teológica latino-americana. Seu primeiro movimento é uma incursão na reflexão sobre pobreza. Apresentamos brevemente algumas das principais percepções de pobreza sociologicamente. Como a modernidade mudou a concepção de pobreza e progressivamente criou uma percepção negativa do pobre. Como isso nos afeta no Brasil e quais os efeitos da compreensão espiritual e neoliberal de pobreza para as lutas por justiça e libertação. O segundo movimento parte da noção de justiça, apresentado pelo evangelho de Mateus, como o modelo de relação, também econômica, exigido por Cristo para o seu povo e todo o mundo. O artigo apresenta também alguns dos principais aspectos que são exigidos para a relação da justiça no mundo contemporâneo, especialmente no hemisfério Sul, para vermos qual é nossa contribuição para que o “novo” possa emergir: relações econômicas, relações culturais, relações políticas, relações sexuais, relações de gênero e, por último, relações epistemológicas e teológicas. This paper deals with an important subject for the Latin American theological reflection. Its first movement is an incursion on the reflection about poverty. We will briefly check some of the main perceptions of poverty in a sociological way. How modernity changed the understanding of poverty and progressively created a negative perception of the poor. How it affected us in Brazil and what the effects of the neoliberal and spiritual understanding of poverty to the struggles for justice and liberation. The second movement will drink from the notion of justice, strongly presented in the gospel of Matthew, as the model of relation, also economic, demanded by Christ for his people and for the whole world. Some of the main aspects which demand us a plight for justice in the contemporary world, especially experienced in the Southern hemisphere will be presented, in order to see what is the contribution we can make to help the “new” to emerge in: economic relations, cultural relations, political relations, sexual relations, gender relations and lastly epistemological and theological relations.
A Novel Method of Improving Non-Sinusoidal Periodic Waveform in Force Excitation Control System
Authors: Sang Yong ,   School of Mechanical Engineering, Dalian University of Technology, Zhao Jianlong , Zhu Yu , Shao Lilai ,   , E-mail: sang110@163.com
Published: May 2016

A non-sinusoidal periodic waveform, such as a triangle wave, is often used as the testing input signal in force excitation control systems. Limited by the bandwidth of the system, the output waveform is often distorted, and the dynamic tracking accuracy is reduced. As an alternative to a hardware upgrade, a novel method of improving the tracking precision of the non-sinusoidal periodic waveform in the force excitation control system is presented. A key technique of the method is the adjustment of the spectrum of the non-sinusoidal periodic waveform in advance according to the frequency response characteristic of the control system. The working principle of the frequency-box regulator, the formula derivation, and the operation steps are explained. Simulations and tests are conducted to confirm the effectiveness of the method. The results show that the novel method (frequency-box regulation) works well in the force excitation control system.
On evaluations of propositional formulas in countable structures
Authors: Perovic Aleksandar , Doder Dragan , Ognjanovic Zoran , Raskovic Miodrag
Published: May 2016

Let L be a countable first-order language such that its set of constant
symbols Const(L) is countable. We provide a complete infinitary propositional
logic (formulas remain finite sequences of symbols, but we use inference
rules with countably many premises) for description of C-valued L-structures,
where C is an infinite subset of Const(L). The purpose of such a formalism is
to provide a general propositional framework for reasoning about F-valued
evaluations of propositional formulas, where F is a C-valued L-structure. The
prime examples of F are the field of rational numbers Q, its countable
elementary extensions, its real and algebraic closures, the field of
fractions Q(?), where ? is a positive infinitesimal and so on.
An extension problem of a connectedness preserving map between Khalimsky spaces
Authors: Han Sang-Eon
Published: May 2016

The goal of the present paper is to study an extension problem of a connected
preserving (for short, CP-) map between Khalimsky (K-for brevity, if there is
no ambiguity) spaces. As a generalization of a K-continuous map, for
K-topological spaces the recent paper [13] develops a function sending
connected sets to connected ones (for brevity, an A-map: see Definition 3.1
in the present paper). Since this map plays an important role in applied
topology including digital topology, digital geometry and mathematical
morphology, the present paper studies an extension problem of a CP-map in
terms of both an A-retract and an A-isomorphism (see Example 5.2). Since
K-topological spaces have been often used for studying digital images, this
extension problem can contribute to a certain areas of computer science and
mathematical morphology.
Generalized reflexive and anti-reflexive solution for a system of equations
Authors: Nacevska Biljana
Published: May 2016

In this article we find necessary and sufficient conditions for the
generalized reflexive and antireflexive solution of the system of equations
ax = b and xc = d in a ring with involution. As corollaries, among other
results, we obtain some recent results from (A. Dajic and J. Koliha, Linear
Algebra Appl. (2008)), and Li Fanliang, Hu Xiuyan and Zhang Lei, Acta Math.
Scientia 28B(1) (2008)).
Generalized Hyers-Ulam stability of general cubic functional equation in random normed spaces
Authors: Kim Seong , Rassias John , Hussain Nawab , Cho Yeol
Published: May 2016

In this paper, we investigate the generalized Hyers-Ulam stability of a
general cubic functional equation: f(x+ky)-kf(x+y)+kf(x-y)
-f(x-ky)=2k(k2-1)f(y) for fixed k ? Z+ with k ? 2 in random
normed spaces.
Half inverse problem for the impulsive diffusion operator with discontinuous coefficient
Authors: Çakmak Yaşar , Işık Seval
Published: May 2016

The half inverse problem is to construct coefficients of the operator in a
whole interval by using one spectrum and potential known in a semi interval.
In this paper, by using the Hocstadt-Lieberman and Yang-Zettl?s methods we
show that if p(x) and q(x) are known on the interval (?/2,?), then only one
spectrum suffices to determine p (x),q(x) functions and ?,h coefficients on
the interval (0,?) for impulsive diffusion operator with discontinuous
coefficient.
Computation of the greatest regular equivalence
Authors: Stankovic Ivan , Micic Ivana , Jancic Zorana
Published: May 2016

The notion of social roles is a centerpiece of most sociological theoretical
considerations. Regular equivalences were introduced by White and Reitz in
[29] as the least restrictive among the most commonly used definitions of
equivalence in social network analysis. In this paper we consider a
generalization of this notion to a bipartite case. We define a pair of
regular equivalences on a two-mode social network and we provide an algorithm
for computing the greatest pair of regular equivalences.
On soft regular generalized closed sets with respect to a soft ideal in soft topological spaces
Authors: Güzel Ergül , Yüksel Şaziye
Published: May 2016

The notion of soft ideal in soft topological spaces was studied by Mustafa
and Sleim [9]. They studied the concept of soft generalized closed sets with
respect to a soft ideal, which is the extension of the concept of soft
generalized closed sets. In this paper, we define soft regular generalized
closed and open sets with respect to a soft ideal in soft topological spaces
and study some of their properties. We introduce these concepts in soft
topological spaces which are defined over an initial universe with a fixed
set of parameters.
Retraction notice to: Yousef Estaremia, On a class of operators with normal aluthge transformations, Filomat 29:8 (2015), 1789-1794
Authors: Editorial E
Published: May 2016

Due to technical problems, we made an error publishing the same article
twice. Precisely, the article Y. Estaremi, On a Class of Operators With
Normal Aluthge Transformations, 29:8 (2015), 1789-1794. is the same as Y.
Estaremi, On a Class of Operators With Normal Aluthge Transformations, 29:5
(2015), 969-975.

 Link to the retracted article 10.2298/FIL1508789E
Extending the Moore-Penrose inverse
Authors: Dincic Nebojsa
Published: May 2016

We show that it is possible to define generalized inverse similar to the
Moore-Penrose inverse by slightly modified Penrose equations. Then we are
Investigating properties of this, so-called extended Moore-Penrose inverse.
Finite difference approximation for parabolic interface problem with time-dependent coefficients
Authors: Sredojevic Bratislav , Bojovic Dejan
Published: May 2016

The convergence of difference scheme for two-dimensional initial boundary
value problem for the heat equation with concentrated capacity and
time-dependent coefficients of the space derivatives, is considered. An
estimate of the rate of convergence in a special discrete W~12,1/2 Sobolev
norm, compatible with the smoothness of the coefficients and solution, is
proved.
Vertex decomposable graph
Authors: Hajisharifi N. , Yassemi S.
Published: May 2016

Let G be a simple graph on the vertex set V (G) and S = {x11,...,xn1} a
subset of V (G). Let m1,...,mn ? 2 be integers and G1,...,Gn connected simple
graphs on the vertex sets V (Gi) = {xi1,..., ximi} for i = 1,..., n. The
graph G(G1,...,Gn) is obtained from G by attaching Gi to G at the vertex xi1
for i = 1,...,n. We give a characterization of G(G1,...,Gn) for being
vertex decomposable. This generalizes a result due to Mousivand, Seyed
Fakhari, and Yassemi.
Direct estimations of new generalized Baskakov-Szász operators
Authors: Gupta Vijay , Malik Neha
Published: May 2016

Several modifications of the discrete operators are available in the
literature. In the recent years, certain modifications of the well-known
Baskakov and Szasz-Mirakyan operators have been discussed based on certain
parameters. We propose mixed summation-integral type operators and estimate
the quantitative asymptotic formula and a global direct result for the
special case. For general case, we establish moments and some direct
convergence results in ordinary approximation, which includes point wise
approximation, asymptotic formula and a direct result in terms of modulus of
continuity.
On the conjugates of certain algebraic integers
Authors: Zaïmi Toufik
Published: May 2016

A well-known theorem, due to C. J. Smyth, asserts that two conjugates of a
Pisot number, having the same modulus are necessary complex conjugates. We
show that this result remains true for K-Pisot numbers, where K is a real
algebraic number field. Also, we prove that a j-Pisot number, where j is a
natural number, can not have more than 2j conjugates with the same modulus.
An Integrated Software Technology Based on Research and Field Application for Completion, Stimulation and Fluid Placement Design in Complex Wells
Authors: Sau Rajes , Goodrow Anthony , Rockwell Marcus , Mayer Christian Sebastian Jakob , Shuchart Chris E. , Grubert Marcel Andre
Published: May 2016

Today, many wells all over the world are being completed with long intervals and complex completion equipment, such as limited-entry liners (LEL) and inflow control devices (ICDs). Accurate predictions and understanding of fluid placement during stimulation or injection operations through these complex completions can be quite challenging. This paper presents an integrated software technology based on research and field application for advanced completion, stimulation and fluid placement design of complex wells. The crux of the software is a novel and robust computational modeling simulator. Using innovative computational algorithms, this simulator models numerous challenging physics of acid stimulation and transient injection of multiple fluids through openhole complex completions, e.g. LEL and ICDs in long wells. LEL hole or ICD nozzle diameter, hole distributions, and packers are modeled as part of the completion while explicitly tracking multiple fluid concentrations and accounting for completion and formation pressure drops along the lateral and transient reservoir dynamics. Fundamental understanding of fluid placement is achieved through this stable and accurate computational model supported by experiments. Large-scale experiments have been performed to validate the model and understand the annular fluid displacement of multiple fluids through complex liner designs. Fluid invasion and stimulation distribution (wormhole and skin) along the lateral are computed by the simulator, which is coupled with a dynamic wormhole model. In addition to acid stimulation design, the software also provides capabilities to model various well injection processes in sandstone and carbonate reservoirs, such as scale squeezes, solvent treatments, and HF acid treatments along with corresponding productivity uplift estimates.

The integration of the computational model into proprietary subsurface software is achieved through an accelerated technology delivery process involving engineering researchers, software developers/computational scientists, and end-users in the field. The software creates a distinct advantage by giving engineers in the field the capability to quickly perform these analyses, which can lead to reduced overall development and operation costs, increased individual well productivity, and most importantly the capture of additional reserves.

A case history of the model application will be presented. The model was used to design a limited-entry liner with 4 mm holes distributed non-uniformly among 12 compartments. The liner enabled successful high-rate bullhead stimulation of an 11,500-ft lateral, resulting in reduced cost, limited risk, and elimination of the need for coiled tubing. The field data is used to validate the model predictions and calibrate model parameters.
An Alternate Mud Proposal to Minimise Borehole Instability
Authors: Altun Gursat , Osgouei Ali Ettehadi , Ozyurtkan Mustafa Hakan
Published: May 2016

There exists a strong relationship between mud and borehole stabilities. Mud instability is associated with flocculation that is primarily caused by high active solids, high electrolyte concentration, and high temperature. Drilling in hot environments coupled with active or reactive solid contamination results in severe operational problems which get worse with the presence of salt intrusion. Therefore, drilling engineers search for alternate drilling fluids to eliminate and/or minimize instability problems such as stuck pipes, circulation loss, excessive torque and drag, inadequate cuttings transport, and sloughing borehole. Such mud should tolerate for accumulation of high amount of reactive solids and mitigate diffetential pressure sticking to avoid stuck pipe.

This study is an experimental work to investigate and remediate the rheological and fluid loss properties of both unweighted and barite-weighted sepiolite muds heavily contaminated with active solid. Sepiolite muds were formulated in a certain mixing order of additives. Bentonite clay with API specifications (OCMA) at a rate of 80-lbm/bbl was used to simulate active solid. Rheological properties of mud samples were tested at varying temperatures ranging from ambient to 400oF along with a sodium chloride content of 260,000-ppm (120-lbm/bbl). The filtration loss properties were determined at 300oF. Methylene blue test was also performed to determine the tolerance of sepiolite mud for reactive solid contamination. Sepiolite mud was also investigated for tendency to cause wall sticking to consider incidence of differential pressure sticking of drill pipe. Bulk Sticking Coefficient (Ksc) of sepiolite based mud was determined as indicator parameters under high pressure (500 psi) and high temperature (up to 400oF).

Sepiolite mud samples resulted in appropriate yield point, plastic viscosity, and water loss values. More importantly, Methylene Blue values lower than 13-lb/bbl and appropriate sticking coefficient were the concrete usability indicator of sepiolite muds against heavily reactive-clay contamination. In other words, sepiolite muds might be a good alternative to drill wells experiencing instability problems resulting from active solid contamination and differential sticking.
Reversing the Production Decline and Maximizing Late-life Value of a Mature Oilfield in Offshore South China – A Brownfield Re-Development Project Success Story
Authors: Luo Donghong , Li Lin , Tao Bin , Halomoan Parlindungan Monris , Bisain Amarjit Singh , Wang Chao
Published: May 2016

A brownfield new horizontal wells re-development project was initiated in mid-2012 to arrest the production decline rate of Panyu oilfield with average field water cut of 91% and to further increase its reserve recovery.

The new horizontal wells campaign were targeting at the remaining less than 5m thin oil column with strong bottom water drive and the previously unexploited 2m thin layers reserves. However, the re-development and exploiting these targets present operational challenges with increasing complexity. Not only the horizontal well needs to be optimally placed within complex target zone, the lateral also needs to be placed as close as possible to the reservoir top to keep it away from the unknown current fluid contact.

This paper features the best practices implemented to optimize the standoff between horizontal section and oil water contact that is very sensitive to well performance and reserve recovery. This includes precise landing with low incident angle and lateral placement within less than 0.5m window below the reservoir top utilizing the directional electromagnetic and wellbore imaging applications for detail reservoir profiles description and current OWC level identification while drilling.

Multiple wells' field cases will be discussed in the paper based on 25 horizontal wells completed during the course of the project. Several key outcomes that have been observed during the execution and upon the completion of the well will be highlighted, including:- Clear identification of the reservoir geo-bodies and their interfaces including the current fluid contact level- Optimum lateral placement in the best position to drain the remaining hydrocarbon- Reversing the production decline trend and exceeding the cumulative incremental oil by 45% over the forecast.

Finally, the authors conclude that significant oil reserve can remain in mature fields and be recovered through re-entry horizontal wells drilling program. The implementation of the best practices in operation is the key enabler to effectively place the trajectory in the best place to drain the remaining hydrocarbon that lead to maximizing the late-life value of a mature oilfield.
Scenario-Based Pore Pressure Prediction to Reduce Drilling Risks, Examples From the Sarawak Asset, North West Borneo, Malaysia
Authors: D. Warrlich Georg Mathis , Palm Danielle , van Alebeek Hans Johannes , Volchkov Dmitry , Hong Sia Chew , Adams Erwin W , Ryba Artur , Schutjens Peter Maarten , Stevens David A , Peacock Anthony William , Row Zuka , Ghosh Kallole
Published: May 2016

Pore-pressure prediction in a mature hydrocarbon province with producing fields bears issues different from an exploration or immature basin setting. Appraisal and production activities can introduce anadditional set of complications that needs to be considered to make well-constrained pore-pressurepredictions. Problems for infill drilling can arise from severe changes in rock strength (fracture gradientreduction), caused by depletion of reservoirs through production, or development drilling in neighboringfields, if there is pressure communication via a common aquifer. Increases above initial pressure can be caused by crossflow from overpressured reservoir layers through poor cement bonds or abandonments. Reservoirs can also receive additional pressure through water or gas injection.

The Luconia gas province is a mature basin and several stages of successful exploration, appraisal, development and infill-drilling campaigns. Shell, supported by its partners, has successfully overcome the above mentioned issues by thorough and innovative pore-pressure prediction approaches. In addition to the standard bracketing of uncertainties, 3 key process elements are employed:proper framing of the pore-pressure prediction and continued interfaces with all stakeholders anda 'scenario-based'prediction approach, that captures all possible effects caused by appraisal and production of the target reservoir or neighboring fields, and that predicts their impact on the pore pressure of the reservoir to be drilled.Risks identified are captured and mitigated via a 5 point pore-pressure prediction that spans a facilities design range as well as a wider drilling range. The drilling-range end members have a low probability of occurring, but have to be captured to enable hardware selection that ensures safe drilling execution. State of the art technologies are employed to achieve this, including 4D seismic, regional databases, innovative modeling methodologies and full integration in a well-delivery process.