bluuebunny/crossref_metadata_2025_split huggingface dataset:
Aberration-Corrected X-Ray Spectrum Imaging and Fresnel Contrast to Differentiate Nanoclusters and Cavities in Helium-Irradiated Alloy 14YWT
Authors: Parish Chad M. , Miller Michael K. 
Published: March 2014

AbstractHelium accumulation negatively impacts structural materials used in neutron-irradiated environments, such as fission and fusion reactors. Next-generation fission and fusion reactors will require structural materials, such as steels, that are resistant to large neutron doses yet see service temperatures in the range most affected by helium embrittlement. Previous work has indicated the difficulty of experimentally differentiating nanometer-sized cavities such as helium bubbles from the Ti–Y–O rich nanoclusters (NCs) in radiation-tolerant nanostructured ferritic alloys (NFAs). Because the NCs are expected to sequester helium away from grain boundaries and reduce embrittlement, experimental methods to study simultaneously the NC and bubble populations are needed. In this study, aberration-corrected scanning transmission electron microscopy (STEM) results combining high-collection-efficiency X-ray spectrum images (SIs), multivariate statistical analysis (MVSA), and Fresnel-contrast bright-field STEM imaging, have been used for such a purpose. Fresnel-contrast imaging, with careful attention to TEM-STEM reciprocity, differentiates bubbles from NCs. MVSA of X-ray SIs unambiguously identifies NCs. Therefore, combined Fresnel-contrast STEM and X-ray SI is an effective STEM-based method to characterize helium-bearing NFAs.
A method to identify the boundary between rocky and gaseous exoplanets from tidal theory and transit durations
Authors: Barnes Rory 
Published: March 2014

AbstractThe determination of an exoplanet as rocky is critical for the assessment of planetary habitability. Observationally, the number of small-radius, transiting planets with accompanying mass measurements is insufficient for a robust determination of the transitional mass or radius. Theoretically, models predict that rocky planets can grow large enough to become gas giants when they reach ~10 MEarth, but the transitional mass remains unknown. Here I show how transit data, interpreted in the context of tidal theory, can reveal the critical radius that separates rocky and gaseous exoplanets. Standard tidal models predict that rocky exoplanets’ orbits are tidally circularized much more rapidly than gaseous bodies’, suggesting the former will tend to be found on circular orbits at larger semi-major axes than the latter. Well-sampled transits can provide a minimum eccentricity of the orbit, allowing a measurement of this differential circularization. I show that this effect should be present in the data from the Kepler spacecraft, but is not apparent. Instead, it appears that there is no evidence of tidal circularization at any planetary radius, probably because the publicly-available data, particularly the impact parameters, are not accurate enough. I also review the bias in the transit duration towards values that are smaller than that of planets on circular orbits, stressing that the azimuthal velocity of the planet determines the transit duration. The ensemble of Kepler planet candidates may be able to determine the critical radius between rocky and gaseous exoplanets, tidal dissipation as a function of planetary radius, and discriminate between tidal models.
Molecular epidemiology and population structure of the honey bee brood pathogenMelissococcus plutonius
Authors: Budge Giles E , Shirley Mark D F , Jones Benjamin , Quill Emiline , Tomkies Victoria , Feil Edward J , Brown Mike A , Haynes Edward G 
Published: March 2014

AbstractMelissococcus plutonius is the causative agent of European foulbrood (EFB), which is a serious brood disease of the European honey bee (Apis mellifera). EFB remains a threat because of a poor understanding of disease epidemiology. We used a recently published multi-locus sequence typing method to characterise 206 M. plutonius isolates recovered from outbreaks in England and Wales over the course of 2 years. We detected 15 different sequence types (STs), which were resolved by eBURST and phylogenetic analysis into three clonal complexes (CCs) 3, 12 and 13. Single and double locus variants within CC3 were the most abundant and widespread genotypes, accounting for 85% of the cases. In contrast, CCs 12 and 13 were rarer and predominantly found in geographical regions of high sampling intensity, consistent with a more recent introduction and localised spread. K-function analysis and interpoint distance tests revealed significant geographical clustering in five common STs, but pointed to different dispersal patterns between STs. We noted that CCs appeared to vary in pathogenicity and that infection caused by the more pathogenic variants is more likely to lead to honey bee colony destruction, as opposed to treatment. The importance of these findings for improving our understanding of disease aetiology and control are discussed.
Methicillin-Resistant Staphylococcus aureus Transmission and Infections in a Neonatal Intensive Care Unit despite Active Surveillance Cultures and Decolonization: Challenges for Infection Prevention
Authors: Popoola Victor O. , Budd Alicia , Wittig Sara M. , Ross Tracy , Aucott Susan W. , Perl Trish M. , Carroll Karen C. , Milstone Aaron M. 
Published: March 2014

Objective.To characterize the epidemiology of methicillin-resistant Staphylococcus aureus (MRSA) transmission and infections in a level IIIC neonatal intensive care unit (NICU) and identify barriers to MRSA control.Setting and Design.Retrospective cohort study in a university-affiliated NICU with an MRSA control program including weekly nares cultures of all neonates and admission nares cultures for neonates transferred from other hospitals or admitted from home.Methods.Medical records were reviewed to identify neonates with NICU-acquired MRSA colonization or infection between April 2007 and December 2011. Compliance with hand hygiene and an MRSA decolonization protocol were monitored. Relatedness of MRSA strains were assessed using pulsed-field gel electrophoresis (PFGE).Results.Of 3,536 neonates, 74 (2.0%) had a culture grow MRSA, including 62 neonates with NICU-acquired MRSA. Nineteen of 74 neonates (26%) had an MRSA infection, including 8 who became infected before they were identified as MRSA colonized, and 11 of 66 colonized neonates (17%) developed a subsequent infection. Of the 37 neonates that underwent decolonization, 6 (16%) developed a subsequent infection, and 7 of 14 (50%) that remained in the NICU for 21 days or more became recolonized with MRSA. Using PFGE, there were 14 different strain types identified, with USA300 being the most common (31%).Conclusions.Current strategies to prevent infections—including active identification and decolonization of MRSA-colonized neonates—are inadequate because infants develop infections before being identified as colonized or after attempted decolonization. Future prevention efforts would benefit from improving detection of MRSA colonization, optimizing decolonization regimens, and identifying and interrupting reservoirs of transmission.
First Report of Fusarium Rot of Garlic Bulbs Caused by Fusarium proliferatum in North Carolina
Authors: Quesada-Ocampo L. M. , Butler S. , Withers S. , Ivors K. 
Published: March 2014

In August of 2013, garlic bulbs (Allium sativum) of the variety Chesnok Red grown and stored under dry conditions by a commercial producer in Buncombe County showed water-soaked, tan to salmon-pink lesions. Lesions on cloves became soft over time, slightly sunken, and had mycelium near the center of the bulb, which is characteristic of Fusarium rots on garlic (1,2). Approximately 10 to 20% of the bulbs inspected in the drying storage room were affected. Surface-sterilized tissue was excised from the margin of lesions on eight bulbs, plated onto acid potato dextrose agar (APDA), and incubated in the dark at room temperature (21°C). White to light pink colonies with abundant aerial mycelium and a purple pigment were obtained from all samples after 2 to 3 days of incubation. Inspection of colony morphology and reproductive structures under a microscope revealed that isolate characteristics were consistent with Fusarium proliferatum (Matsushima) Nirenberg. Microscopic morphological characteristics of the isolate included hyaline, septate hyphae; slender, slightly curved macroconidia with three to five septae produced in sporodochia; curved apical cell; and club-shaped, aseptate microconidia (measuring 3.3 to 8.3 × 1.1 to 1.3 μm) produced in chains by mono and polyphyalides. To further define the identity of the isolate, the beta-tubulin (Btub), elongation factor 1a (EF1a), and internal transcribed spacer (ITS) regions were amplified and sequenced (3). The resulting sequences were compared against the GenBank nucleotide database by using a BLAST alignment, which revealed that the isolate had 100% identity with F. proliferatum for the Btub, EF1a, and ITS regions (GenBank Accession Nos. AF291055.1, JX118976.1, and HF930594.1, respectively). Sequences for the isolate were deposited in GenBank under accessions KJ128963, KJ128964, and KJ128965. While there have been other reports of F. proliferatum causing bulb rot of garlic in the United States (1), to our knowledge, this is the first report in North Carolina. The finding is significant since F. proliferatum can produce a broad range of mycotoxins, including fumonisins, when infecting its host, which is a concern for food safety in Allium crops. References: (1) F. M. Dugan et al. Plant Pathol. 52:426, 2003. (2) L. J. du Toit and F. M. Dugan. Page 15 in: Compendium of Onion and Garlic Diseases and Pests. H. F. Schwartz and S. K. Mohan, eds. The American Phytopathological Society, St. Paul, MN, 2008. (3) T. J. White et al. Page 315 in: PCR Protocols: A Guide to Methods and Applications. M. A. Innis et al., eds. Academic Press, San Diego, CA, 1990.
Detecting translational regulation by change point analysis of ribosome profiling datasets
Authors: Zupanic A. , Meplan C. , Grellscheid S. N. , Mathers J. C. , Kirkwood T. B. L. , Hesketh J. E. , Shanley D. P. 
Published: March 2014

AbstractRibo-Seq maps the location of translating ribosomes on mature mRNA transcripts. While ribosome density is constant along the length of the mRNA coding region, it can be altered by translational regulatory events. In this study, we developed a method to detect translational regulation of individual mRNAs from their ribosome profiles, utilizing changes in ribosome density. We used mathematical modelling to show that changes in ribosome density should occur along the mRNA at the point of regulation. We analyzed a Ribo-Seq dataset obtained for mouse embryonic stem cells and showed that normalization by corresponding RNA-Seq can be used to improve the Ribo-Seq quality by removing bias introduced by deep-sequencing and alignment artefacts. After normalization, we applied a change point algorithm to detect changes in ribosome density present in individual mRNA ribosome profiles. Additional sequence and gene isoform information obtained from the UCSC Genome Browser allowed us to further categorize the detected changes into different mechanisms of regulation. In particular, we detected several mRNAs with known post-transcriptional regulation, e.g. premature termination for selenoprotein mRNAs and translational control ofAtf4, but also several more mRNAs with hitherto unknown translational regulation. Additionally, our approach proved useful for identification of new gene isoforms.
Benchmarking model of supplier development for an Indian gear manufacturing company
Authors: Routroy Srikanta , Kumar Pradhan Sudeep 
Published: March 2014

Purpose
– The aim of this paper is to propose a benchmarking model of supplier development (SD) for an Indian gear manufacturing company for its successful adoption and improvement in a continuous basis.

Design/methodology/approach
– Thirteen SD critical success factors (CSFs) are identified and classified into four categories through extensive literature review and discussion held with managers/senior engineers in different Indian manufacturing companies. The four categories are primary CSFs related to supplier, secondary CSFs related to supplier, CSFs related to manufacturer and CSFs related to both manufacturer and supplier. The interpretative structural modeling (ISM) approach is applied to the Indian gear manufacturing company for developing and analyzing structural framework of CSFs to propose a benchmarking model for SD.

Findings
– It is concluded that SD adoption should be carried out in four phases sequentially for the Indian gear manufacturing company. The first, second, third and fourth phase should sequentially focus on primary CSFs related to supplier; secondary CSFs related to supplier; CSFs related to manufacturer; and CSFs related to both manufacturer and supplier, respectively. The proposed benchmarking model has four phases (i.e. plan, analyze, implement and measure) and bifurcated into 12 steps to enhance the performance of CSFs.

Practical implications
– This paper provides a useful benchmarking model for successful adoption of SD in manufacturing organizations.

Originality/value
– This is one of the few studies to develop the relationship of CSFs for SD in general and its application to an Indian gear manufacturing company in particular. A benchmarking model for SD is also proposed having five phases and 12 steps. The findings of the proposed structural framework and benchmarking model for the Indian gear manufacturing company are discussed in detail and will serve as a guideline for successful adoption of SD in manufacturing environment.
Process management, innovation and efficiency performance
Authors: L. Sanders Jones Janine , Linderman Kevin 
Published: March 2014

Purpose
– Much of the practitioner literature touts the universal benefits of process management and its impact on operational performance. However, in academic literature, empirical evidence is mixed. The purpose of this study is to investigate the role of the competitive intensity on the effectiveness of process management.

Design/methodology/approach
– Survey data from manufacturing plants were collected from through a global research project. Regression analysis was used to test hypotheses.

Findings
– The influence of process design on efficiency and innovation performance is not dependent on competitive intensity; however, the impact of process improvement and process control on efficiency and innovation performance is in some instances moderated by competitive intensity.

Research limitations/implications
– The inclusion of competitive intensity as a contingency variable helps to explain the contextual impact of process management on efficiency and innovation.

Practical implications
– Process management can be an effective tool if the levels of process design, control, and improvement are customized to fit with the competitive environment.

Originality/value
– This is one of the few studies to empirically examine process management as three core elements. Previous studies utilized a single construct of process management or multiple manufacturing practices such as customer/supplier involvement, statistical quality control, process focus, and cross-functional teams to measure process management. Using this measurement approach demonstrates how process management can influence both efficiency and innovation.
Rework and schedule performance
Authors: Hwang Bon-Gang , Yang Shimin 
Published: March 2014

Purpose
– Rework is a pervasive problem in the construction industry. While several studies have examined the relationship between rework and cost overruns, few have related rework to schedule performance impacts. As a result, the purpose of this paper is to assess rework in the construction industry and its impact on schedule performance. Additionally a discussion of the most probable causes for rework that affect schedule outcomes is presented, with some recommended solutions.

Design/methodology/approach
– To achieve the objectives of the study, a questionnaire was developed and the responses from 32 companies in Singapore were analyzed. Furthermore, face-to-face interviews with six industry experts were conducted to get an in-depth understanding of the survey results.

Findings
– The findings of this study revealed that rework is a leading factor affecting schedule performance and its occurrence is relatively high in the construction industry, with a significant contribution to construction schedule growth. It also identified certain root causes, namely design-related changes, poor design coordination and poor site management as factors that most negatively affect schedule performance.

Originality/value
– It is anticipated that once companies recognize the causes for rework and their impacts on schedule, they will develop strategies to manage and prevent rework, ultimately allowing the industry to improve on project delivery schedule performance.
Using public-private partnerships for the building and management of school assets and services
Authors: Liu Tingting , Wilkinson Suzanne 
Published: March 2014

Purpose
– The provision of school assets and associated services is essential for achieving a country's educational outcomes. Building and managing schools usually features large component of operation, multiple groups of stakeholders, relatively simple design and technical requirements and tight timeframes to be completed to meet the open date. Internationally, public-private partnerships (PPPs) were introduced as innovative delivery models to bring forward school projects. The purpose of this paper is to evaluate the PPP experiences in the school sector focusing on the critical dimensions impacting on the viability of using PPPs for school development.

Design/methodology/approach
– Comparative case studies of two school PPP projects based in Australia and New Zealand were adopted as the main research method. Semi-structured interviews with key stakeholders were used as primary data collection method.

Findings
– By examining the procedural and organisational arrangements from a comparative perspective, the research finds that, for a successful school PPP, the followings are critical: sound business case development; size-adjusted and streamlined tendering process; localised private sector partner and streamlined finance; extensive stakeholder engagement; and effective governance and organisational structure and enhanced partnership.

Originality/value
– The findings provide practical implications for policy makers and public procuring authorities initiating school projects and private entities seeking investment opportunities. By implementing the strategies derived from this research and adjusting to their own social and economic environment, governments and industry would be at a better position to develop and manage schools using PPPs.
Convergence of corporate governance in Malaysia and Thailand
Authors: Abdulla Al Mamun Syed , Badir Yousre 
Published: March 2014

Purpose– The purpose of this paper is to examine whether there is a firm-level corporate governance (CG) convergence in two emerging economies, namely Malaysia and Thailand in post-Asian financial crisis periods, and how the level of convergence is moderated by different firm-specific factors.Design/methodology/approach– Using data collected from annual reports of top Malaysian and Thai companies in two point of times 2005 and 2008, this research examines the attributes of board of directors to find the firm-level CG convergence. This study, based on prior literature, identified firm-specific factors to assess their moderating impact on the level of convergence. This paper exploits beta and sigma convergence technique to measure the CG convergence.Findings– Results show that top Malaysian and Thai companies have developed internal CG practices in similar way with increasing board independent, separate board leadership, important board committees, board education, and participation in the post-crisis reform regime. Accordingly, there is a firm-level CG convergence within companies of an individual country, i.e. intra-convergence, and companies across the countries, i.e. inter-convergence. Notwithstanding, the study does not find the unconditional convergence in all CG variables. Additionally, it observes that the firm-level CG convergence is moderated by firm-specific factors.Practical implications– Outcomes of the study have the implication to understand the complicated changing aspects of internal CG practices in emerging economies which, in turn, can help to formulate and implement effective CG structure so that firms can tackle adverse effects of any further economic crisis. Because this paper highlights that the firms in these emerging economies have enough room yet to improve their CG practices to become internationally competitive.Originality/value– This paper demonstrates how internal CG practices may evolve and converge in emerging Southeast Asian economies. Results related to moderating factors of firm-level CG convergence contribute in literature by exploring a new dimension of CG convergence.
What influence dividend decisions of firms in Sub-Saharan African?
Authors: C. Arko Anastacia , Abor Joshua , K.D. Adjasi Charles , Amidu Mohammed 
Published: March 2014

Purpose– The purpose of this paper is to examine the determinants of the dividend decisions of firms in Sub-Saharan Africa (SSA).Design/methodology/approach– The paper applies a two-step estimation procedure using firm-level panel data for firms in selected SSA countries during the period from 1997 to 2007. In the first step the paper employs a probit model to estimate the parameters of the determinants of the decision to pay or not to pay dividends. In the second step the paper estimates the parameters of the dividend payout and dividend per share models by applying the generalised least squares techniques.Findings– The results provide consistent evidence that dividend decision and its payments are influenced by firm profitability level, investment opportunity sets, taxation, leverage, institutional shareholding and risk. The results affirm the signalling, agency cost and free-cash flow theories of dividend policy.Originality/value– The main value of this paper is identification of factors that influence dividend decisions of firms in SSA.