bluuebunny/crossref_metadata_2025_split huggingface dataset:
Flow in a meandering channel
Authors: Floryan J. M. 
Published: April 2015

A comprehensive analysis of the pressure-gradient driven flow in a meandering channel has been presented. This geometry is of interest as it can be used for the creation of streamwise vortices which magnify the transverse transport of scalar quantities, e.g. heat transfer. The linear stability theory has been used to determine the meandering wavelengths required for the vortex formation. It has been demonstrated that reduction of the wavelength results in the onset of flow separation which, when combined with the wall geometry, results in an effective channel narrowing: the stream ‘lifts up’ above the wall and becomes nearly rectilinear, thus eliminating vortex-generating centrifugal forces. Increase of the wavelength also leads to a nearly rectilinear stream, as the slope of the wall modulations becomes negligible. As shear-driven instability may interfere with the formation of vortices, the conditions leading to the onset of such instability have also been investigated. The attributes of the geometry which lead to the most effective vortex generation without any interference from the shear instabilities and with the smallest drag penalty have been identified.
Beyond Networks: Transatlantic Immigration and Wealth in Late Colonial Mexico City
Authors: EYAL HILLEL 
Published: April 2015

AbstractThis article explores the relation between transatlantic immigration and wealth accumulation in late colonial Mexico City, the chief destination for transatlantic emigrants from Spain. In contrast to the prevalent focus in the literature on networks and transatlantic ties, I argue that economic mobility and thus entry into the upper classes of colonial society depended on the social background of immigrants in their home regions in the peninsula. Human capital rather than social capital was the key determinant explaining why certain regional groups, notably the Basques, succeeded economically as merchants and miners, challenging traditional notions of networks and interconnectedness in Atlantic history and beyond. The findings are grounded in quantitative datasets of Spanish immigrants, overcoming both the biases of anecdotal sources and the methodological intricacy of disentangling the causal relationship between wealth accumulation and social ties.
Cuba's Perilous Political Transition to the Post-Castro Era
Authors: LEOGRANDE WILLIAM M. 
Published: April 2015

AbstractIn the years since Raúl Castro took office as president following Fidel Castro's illness and retirement, Cuba has embarked on four major transitions almost simultaneously: a restructuring of elite decision-making; a transformation of Cuba's centrally-planned economy into a market socialist economy; a relaxation of tight social control, providing greater social autonomy for civil society and even a degree of political decompression; and, a transition from the founding generation of the political elite (los históricos) to a successor generation, when neither Castro will hold power. Each of these processes by itself entails political risk; unfolding together, they constitute the greatest political challenge the Cuban regime has faced since the collapse of the Soviet Union.
Non-trivial solutions for a semilinear biharmonic problem with critical growth and potential vanishing at infinity
Authors: Deng Yinbin , Shuai Wei 
Published: April 2015

In this paper, we study the existence of non-trivial solutions for the following class of semilinear biharmonic problem with critical nonlinearity:Here Δ 2u = Δ(Δu), N ≥ 5, μ > 0 is a parameter, 2** = 2N/(N − 4) is the critical Sobolev exponent, V (x) and K (x) are positive continuous functions that vanish at infinity, f is a function with a subcritical growth and P(x) is a bounded, non-negative continuous function. By working in weighted Sobolev spaces and using a variational method, we prove that the problem has at least one non-trivial solution.
Top down and bottom up selection drives variations in frequency and form of a visual signal
Authors: Yeh Chien-Wei , Blamires Sean J. , Liao Chen-Pan , Tso I.-Min 
Published: April 2015

AbstractThe frequency and form of visual signals can be shaped by selection from predators, prey or both. When a signal simultaneously attracts predators and prey, selection may favour a strategy that minimizes risks while attracting prey. Accordingly, varying the frequency and form of the silken decorations added to their web may be a way that Argiope spiders minimize predation while attracting prey. Nonetheless, the role of extraneous factors renders the influences of top down and bottom up selection on decoration frequency and form variation difficult to discern. Here we used dummy spiders and decorations to simulate four possible strategies that the spider Argiope aemula may choose and measured the prey and predator attraction consequences for each in the field. The strategy of decorating at a high frequency with a variable form attracted the most prey, while that of decorating at a high frequency with a fixed form attracted the most predators. These results suggest that mitigating the cost of attracting predators while maintaining prey attraction drives the use of variation in decoration form by many Argiope spp. when decorating frequently. Our study highlights the importance of considering top-down and bottom up selection pressure when devising evolutionary ecology experiments.
Self‐tuned SAW‐less GNSS receiver front end with blocker filtering and gain‐irrelevant DC offset cancellation
Authors: Yu Xiaobao , Song Ying , Wang Zhihua , Chi Baoyong 
Published: April 2015

A self‐tuned surface acoustic wave (SAW)‐less global navigation satellite system (GNSS) receiver is proposed. In the self‐tuning mode, the radio‐frequency amplifier (RFA) is configured as an oscillator and the receiver chain is reused to realise a simple self‐calibration. In the normal operation, the RFA works as a Q‐enhanced radio‐frequency filter to remove the out‐of‐band blockers. A gain‐irrelevant DC offset cancellation is also presented. This GNSS receiver achieves 4.8 dB noise figure and a rejection of 25.8 and 31.8 dB for DCS (1710 MHz) and PCS (1850 MHz) blockers, while consuming <5 mA current from a 1.7 V supply.
Management Evaluation for the Chesapeake Bay Blue Crab Fishery: An Integrated Bioeconomic Approach
Authors: Huang Pei , Woodward Richard T. , Wilberg Michael J. , Tomberlin David 
Published: April 2015

Abstract
We integrated two existing biological models and a newly developed economic demand model to evaluate the biological and economic performance of alternative policies in the Chesapeake Bay blue crab Callinectes sapidus fishery subject to the requirement that yield and revenue be sustainable. The resulting model was able to compare outcomes of alternative management scenarios considered by policy makers. In order to provide insights into the impacts of relevant policy components in a management scenario, we regressed the sustainable outcomes, sustainable yield, and sustainable revenues on a set of policy components. A short fishing season for female crabs combined with a long fishing season for males appeared to increase sustainable yield and revenue. Among size limit policies, lower minimum limits for males, females, peelers, and soft-shell crabs appeared to reduce sustainable outcomes, while a restrictive maximum size limit for mature females seemed to improve fishery performance with respect to both sustainable revenue and sustainable yield.
Received December 18, 2013; accepted November 4, 2014
Influences of Experts' Personal Experiences in Fuzzy Logic Modeling of Atlantic Salmon Habitat
Authors: Mocq J. , St-Hilaire A. , Cunjak R. A. 
Published: April 2015

Abstract
The knowledge of scientific experts, which is regularly used in modeling, is acquired by training, education, and practical experiences that modify the experts' perceptions. Using a case study dealing with fish habitat modeling, we investigated the possible influences and potential biases imparted by some of these personal experiences. Thirty salmon experts with different backgrounds and nationalities defined fuzzy sets and fuzzy rules in a fuzzy habitat model of three Atlantic Salmon Salmo salar life stages. Weighted usable area (WUA) curves were calculated for each expert by coupling the fuzzy model with a hydraulic model applied to the Romaine River (Quebec, Canada). Experts were then split into subgroups, and three possible experiential biases were tested: the experts' main geographic region of expertise (Europe versus North America), their primary source of knowledge (fieldwork, scientific literature, or both), and their employment sector (public or private). A confidence interval was calculated around the median WUA curve for each subgroup by bootstrap resampling. A divergence in the confidence intervals (i.e., no overlap) indicated a significant influence of the tested experience. For all three considered life stages, we observed no significant impact of employment sector or knowledge source on modeled WUA. However, the experts' geographic region of expertise had a significant influence on the output of the spawning adult habitat model. Consequently, the use of local expert knowledge in modeling is recommended.
Received June 16, 2014; accepted December 1, 2014
Remark on a regularity criterion in terms of pressure for the Navier-Stokes equations
Authors: Gala Sadek 
Published: April 2015

In this note we establish a Serrin-type regularity criterion in terms of pressure for Leray weak solutions to the Navier-Stokes equation in

R

d

\mathbb {R}^{d}

. It is known that if a Leray weak solution

u
u

belongs to

L

2

1
−
r

(

(
0
,
T
)

;

L

d
r

)

\ \ for some \ \
0
≤
r
≤
1
,

\begin{equation} L^{\frac {2}{1-r}}\left ( \left ( 0,T\right ) ;L^{\frac {d}{r}}\right ) \text { \ \ for some \ \ }0\leq r\leq 1, \end{equation}

then

u
u

is regular. It is proved that if the pressure

p
p

associated to a Leray weak solution

u
u

belongs to

L

2

2
−
r

(

(
0
,
T
)

;

M

.

2
,

d
r

(

R

d

)

d

)

,

\begin{equation} L^{\frac {2}{2-r}}\left ( \left ( 0,T\right ) ;\overset {.}{\mathcal {M}}_{2,\frac { d}{r}}\left ( \mathbb {R}^{d}\right ) ^{d}\right ) , \end{equation}

where

M

.

2
,

d
r

(

R

d

)

\overset {.}{\mathcal {M}}_{2,\frac {d}{r}}\left ( \mathbb {R}^{d}\right )

is the critical Morrey-Campanato space (a definition is given in the text) for

0
>
r
>
1

0>r>1

, then the weak solution is actually regular. Since this space

M

.

2
,

d
r

\overset {.}{\mathcal {M}}_{2,\frac {d}{r}}

is wider than

L

d
r

L^{\frac {d}{r}}

and

X
.

r

\overset {.}{X}_{r}

, the above regularity criterion (0.2) is an improvement of Zhou’s result.
Implications for informatics given expanding access to care for Veterans and other populations
Authors: Dixon Brian E , Haggstrom David A , Weiner Michael 
Published: April 2015

Abstract
Recent investigations into appointment scheduling within facilities operated by the US Department of Veterans Affairs (VA) illuminate systemic challenges in meeting its goal of providing timely access to care for all Veterans. In the wake of these investigations, new policies have been enacted to expand access to care at VA facilities as well as non-VA facilities if the VA is unable to provide access within a reasonable timeframe or a Veteran lives more than 40 miles from a VA medical facility. These policies are similar to broader health reform efforts that seek to expand access to care for other vulnerable populations. In this perspective, we discuss the informatics implications of expanded access within the VA and its wider applicability across the US health system. Health systems will require robust health information exchange, to maintain coordination while access to care is expanded. Existing informatics research can guide short-term implementation; furthermore, new research is needed to generate evidence about how best to achieve the long-term aim of expanded access to care.
Wind-induced odd gravitational harmonics of Jupiter
Authors: Kong Dali , Zhang Keke , Schubert Gerald 
Published: April 2015

Abstract
While the rotational distortion of Jupiter makes a major contribution to its lowermost order even zonal gravitational coefficients Jn with n ≥ 2, the component of the zonal winds with equatorial antisymmetry, if sufficiently deep, produces a gravitational signature contained in the odd zonal gravitational coefficients Jn with n ≥ 3. Based on a non-spherical model of a polytropic Jupiter with index unity, we compute Jupiter's odd gravitational coefficients J3, J5, J7, …, J11 induced by the equatorially antisymmetric zonal winds that are assumed to be deep. It is found that the lowermost odd gravitational coefficients J3, J5 and J7 are of the same order of magnitude with J3 = −1.6562 × 10−6, J5 = 1.5778 × 10−6 and J7 = −0.7432 × 10−6, and are within the accuracy of high-precision gravitational measurements to be carried out by the Juno spacecraft.
Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z ∼ 2
Authors: Moresco Michele 
Published: April 2015

Abstract
One of the most compelling tasks of modern cosmology is to constrain the expansion history of the Universe, since this measurement can give insights on the nature of dark energy and help to estimate cosmological parameters. In this letter are presented two new measurements of the Hubble parameter H(z) obtained with the cosmic chronometer method up to z ∼ 2. Taking advantage of near-infrared spectroscopy of the few very massive and passive galaxies observed at z &gt; 1.4 available in literature, the differential evolution of this population is estimated and calibrated with different stellar population synthesis models to constrain H(z), including in the final error budget all possible sources of systematic uncertainties (star formation history, stellar metallicity, model dependences). This analysis is able to extend significantly the redshift range coverage with respect to present-day constraints, crossing for the first time the limit at z ∼ 1.75. The new H(z) data are used to estimate the gain in accuracy on cosmological parameters with respect to previous measurements in two cosmological models, finding a small but detectable improvement (∼5 per cent) in particular on ΩM and w0. Finally, a simulation of a Euclid-like survey has been performed to forecast the expected improvement with future data. The provided constraints have been obtained just with the cosmic chronometers approach, without any additional data, and the results show the high potentiality of this method to constrain the expansion history of the Universe at these redshifts.
Hadronic models of blazars require a change of the accretion paradigm
Authors: Zdziarski Andrzej A. , Böttcher Markus 
Published: April 2015

Abstract
We study hadronic models of broad-band emission of jets in radio-loud active galactic nuclei, and their implications for the accretion in those sources. We show that the models that account for broad-band spectra of blazars emitting in the GeV range in the sample of Böttcher et al. have highly super-Eddington jet powers. Furthermore, the ratio of the jet power to the radiative luminosity of the accretion disc is ∼3000 on average and can be as high as ∼105. We then show that the measurements of the radio core shift for the sample imply low magnetic fluxes threading the black hole, which rules out the Blandford–Znajek mechanism to produce powerful jets. These results require that the accretion rate necessary to power the modelled jets is extremely high, and the average radiative accretion efficiency is ∼4 × 10−5. Thus, if the hadronic model is correct, the currently prevailing picture of accretion in AGNs needs to be significantly revised. Also, the obtained accretion mode cannot be dominant during the lifetimes of the sources, as the modelled very high accretion rates would result in too rapid growth of the central supermassive black holes. Finally, the extreme jet powers in the hadronic model are in conflict with the estimates of the jet power by other methods.
Low-mass X-ray binary MAXI  J1421−613 observed by MAXI GSC and Swift XRT
Authors: Serino Motoko , Shidatsu Megumi , Ueda Yoshihiro , Matsuoka Masaru , Negoro Hitoshi , Yamaoka Kazutaka , Kennea Jamie A. , Fukushima Kosuke , Nagayama Takahiro 
Published: April 2015

Monitor of All sky X-ray Image (MAXI) discovered a new outburst of an X-ray transient source named MAXI  J1421−613. Because of the detection of three X-ray bursts from the source, it was identified as a neutron star low-mass X-ray binary. The results of data analyses of the MAXI GSC (Gas Slit Camera) and the Swift XRT (X-Ray Telescope) follow-up observations suggest that the spectral hardness remained unchanged during the first two weeks of the outburst. All the XRT spectra in the 0.5–10 keV band can be well explained by thermal Comptonization of multi-color disk blackbody emission. The photon index of the Comptonized component is ≈ 2, which is typical of low-mass X-ray binaries in the low/hard state. Since X-ray bursts have a maximum peak luminosity, it is possible to estimate the (maximum) distance from its observed peak flux. The peak flux of the second X-ray burst, which was observed by the GSC, is about 5 photons cm−2 s−1. By assuming a blackbody spectrum of 2.5 keV, the maximum distance to the source is estimated as 7 kpc. The position of this source is contained by the large error regions of two bright X-ray sources detected with Orbiting Solar Observatory-7 (OSO-7) in the 1970s. Besides this, no past activities at the XRT position are reported in the literature. If MAXI  J1421−613 is the same source as (one of) these, the outburst observed with MAXI may have occurred after a quiescence of 30–40 years.
TOE drivers for cloud transformation: direct or trust-mediated?
Authors: LI Min , Zhao Dingtao , Yu Yan 
Published: April 2015

Purpose– The purpose of this paper is to explain cloud service transformation in small and medium enterprises (SMEs) based on technology-environment-organization paradigm and understand the role of cloud service trust in transformation process.Design/methodology/approach– A survey involving 107 SMEs was conducted to examine the research model and hypotheses.Findings– First, cloud service trust is found to have a significant positive effect on the SMEs’ cloud service transformation intention. The second finding is about significant influences of technological drivers (reliability and information security), environmental drivers (institutional pressure, structure assurance, and vendor scarcity) and entrepreneurship on SMEs’ cloud service trust. Further, the authors found mediating effects of trust on relationships between external drivers and cloud service transformation.Practical implications– For vendors, it suggests building cloud service trust by distinguishing advantages of their cloud service and by establishing strategic alliances with existing users in marketing to attract potential clients. Vendors should target entrepreneurial organizations as initial customers and then expand to other types of organizations. For users, the study implies the need of cultivating entrepreneurship, if they have innovative IT initiatives and need to speed up the IT innovation absorption. Market regulators can provide adequate structural assurances and survival-of-the-fittest market mechanism to stimulate cloud service market.Originality/value– This study is on the leading edge of systematically investigating drivers for SMEs’ cloud service transformation and further reveals a mediating process, in which technological and environmental aspects have primary effects on cloud service trust that sequentially influences cloud service transformation. These mediating effects imply an essential trust building process of cloud service transformation.
Fuzzy based appraisement module for 3PL evaluation and selection
Authors: Sahu Nitin Kumar , Datta Saurav , Mahapatra Siba Sankar 
Published: April 2015

Purpose
– In today’s’ highly competitive market, outsourcing logistic activities have become a global trend as it offers wide range of services including transportation, distribution, packaging, labeling, warehousing, freight forwarding and order fulfillment. The demand of third-party logistics (3PL) provider becomes an increasingly important issue for corporate seeking improved customer service, operational efficiency, logistics costs as well as capital expenditure reduction. However, choosing a proper 3PL provider is a kind of multi-criteria decision making problem under consideration of complicated criteria hierarchy. Therefore, it seems necessary to develop an efficient appraisement module towards performance evaluation as well as selecting the best 3PL provider. The paper aims to discuss these issues.

Design/methodology/approach
– The present paper proposes a fuzzy based appraisement platform for evaluation and selection of 3PL providers. The theory behind interval-valued fuzzy numbers (IVFNs) has been utilized to aid the said decision-modeling. Based on two appraisement modules for 3PL evaluation; empirical data have been analyzed to validate case application.

Findings
– The proposed method has been found efficient for solving the group decision-making problem under uncertain environment due to vagueness, ambiguity associated with decision-makers’ subjective judgment. The proposed appraisement platform has been explored by an Indian automobile part manufacturing company at eastern part of India. 3PL providers have been evaluated individually to check their performance level with respect to various evaluation attributes. Apart from estimating overall performance metric, the model presented here can identify ill-performing areas which necessitate future attention.

Originality/value
– The major contributions of this work have been summarized as follows: First, development and implementation of an efficient decision-making procedural hierarchy to support 3PL evaluation and selection. Second, an overall performance metric has been introduced. Third, concept of IVFNs has been efficiently explored to facilitate such a appraisement cum selection decision making. Final, the appraisement index system has been extended with the capability to search ill-performing areas which require future progress.