bluuebunny/crossref_metadata_2025_split huggingface dataset:
Properties of Carbon-Oxygen White Dwarf Merger Remnants
Authors: Zhu Chenchong , Chang Philip , van Kerkwijk Marten , Wadsley James 
Published: January 2013

AbstractRecent studies have shown that for suitable initial conditions both super- and sub-Chandrasekhar mass carbon-oxygen white dwarf mergers produce explosions similar to observed SNe Ia. The question remains, however, how much fine tuning is necessary to produce these conditions. We performed a large set of SPH merger simulations, sweeping the possible parameter space. We find trends for merger remnant properties, and discuss how our results affect the viability of our recently proposed sub-Chandrasekhar merger channel for SNe Ia.
Connecting Recurrent Novae to [Some] Type Ia Supernovae
Authors: Patat Ferdinando 
Published: January 2013

AbstractIn this review, I summarize the observational attempts made so far to unveil the nature of the progenitor system(s) of Type Ia supernovae. In particular, I focus on the most recent developments that followed the claimed detection of circumstellar material around a few events, and on the link this possibly establishes with recurrent novae. In this framework, I then discuss the case of RS Oph, what we know of its circumstellar environment, and what this is telling us about its supposed connection to Type Ia supernovae explosions.
Evidence for Circumstellar Material in Type Ia Supernovae via Sodium Absorption Features
Authors: Sternberg Assaf 
Published: January 2013

AbstractType Ia supernovae are very good tools for measuring distances on a cosmic scale. The consensus view is that mass transfer onto a white dwarf in a close binary system leads to a thermonuclear explosion, though the nature of the mass donor is still uncertain. In the single-degenerate model it is a main-sequence star or an evolved star. In the double-degenerate model it is another white dwarf. We study the velocity structure of absorbing material along the line of sight to 35 Type Ia supernovae and find a statistical preference for blueshifted structures, likely arising in gas outflows from the supernova progenitor systems, consistent with a single-degenerate progenitor for a substantial fraction of Type Ia supernovae in nearby spiral galaxies.
Light Curve Models for SN 2009dc
Authors: Kamiya Yasuomi 
Published: January 2013

AbstractSimplified explosion models of super-Chandrasekhar-mass C-O white dwarfs (WDs) are constructed with parameters such as WD mass and 56Ni mass. Their light curves are obtained by solving one-dimensional equations of radiation hydrodynamics, and compared with the observations of SN 2009dc, one of the overluminous Type Ia supernovae, to estimate its properties. As a result, the progenitor of SN 2009dc is suggested to be a 2.2–2.4-M⊙ C-O WD with 1.2–1.4 M⊙ of 56Ni, if the extinction by its host galaxy is negligible.
Progenitor's Signatures in Type Ia Supernova Remnants
Authors: Chiotellis A. , Kosenko D. , Schure K. M. , Vink J. 
Published: January 2013

AbstractThe remnants of Type Ia supernovae (SNe Ia) can provide important clues about their progenitor histories. We discuss two well-observed supernova remnants (SNRs) that are believed to have resulted from SNe Ia, and use various tools to shed light on the possible progenitor histories. We find that Kepler's SNR is consistent with a symbiotic binary progenitor consisting of a white dwarf and an AGB star. Our hydrosimulations can reproduce the observed kinematic and morphological properties. For Tycho's remnant we use the characteristics of the X-ray spectrum and kinematics to show that the ejecta has likely interacted with dense circumstellar gas.
Saltatory formation, sliding and dissolution of ER–PM junctions in migrating cancer cells
Authors: Dingsdale Hayley , Okeke Emmanuel , Awais Muhammad , Haynes Lee , Criddle David N. , Sutton Robert , Tepikin Alexei V. 
Published: January 2013

We demonstrated three novel forms of dynamic behaviour of junctions between the ER (endoplasmic reticulum) and the PM (plasma membrane) in migrating cancer cells: saltatory formation, long-distance sliding and dissolution. The individual ER–PM junctions formed near the leading edge of migrating cells (usually within 0.5 μm of polymerized actin and close to focal adhesions) and appeared suddenly without sliding from the interior of the cell. The long distance sliding and dissolution of ER–PM junctions accompanied the tail withdrawal.
Inherently non‐resonant multi‐band mobile terminal antenna
Authors: Valkonen R. , Ilvonen J. , Icheln C. , Vainikainen P. 
Published: January 2013

An inherently non‐resonant capacitive coupling element antenna for mobile handsets is presented. The compact antenna includes a simple coupling element with a novel multi‐band matching circuit for simultaneous 698–960 and 1710–2690 MHz operation. Experimental results show that the antenna performs strongly in comparison to the current state‐of‐the‐art in mobile terminal antennas, and that the non‐resonant antenna is a competitive choice for mobile terminals.
460 μW 32 dB image rejection ratio second‐order active‐RC complex filter with improved power efficient opamp
Authors: Wang J. , Ye L. , Chen L. , Liu J. , Liao H. 
Published: January 2013

An ultra‐low‐power second‐order Chebyshev active‐RC complex filter for a low‐IF ultra‐low‐power receiver is presented. By utilising a pole‐cancellation push‐pull buffer with feedforward phase compensation technology, the operational amplifier (opamp) realises superior stability while maintaining high gain bandwidth and ultra‐low power consumption. A second‐order complex filter with four proposed opamps and an adaptive bias fabricated in standard 180 nm CMOS process consumes only 460 μW at 1.8 V power supply. The measured centre frequency is 3 MHz and bandwidth is 2 MHz, while it achieves 32 dB image rejection ratio at the centre frequency.
Hardware‐efficient phase‐detection technique for digital clock and data recovery
Authors: Zargaran‐Yazd A. , Keikhosravy K. , Rashtian H. , Mirabbasi S. 
Published: January 2013

A phase‐detection technique for digital clock and data recovery (CDR) in multi‐Gbit/s serial links is presented. Compared to conventional sampling‐based receivers, hardware efficiency at the system‐level is achieved by extracting timing information from analysing the occurrence of certain patterns at the output of four comparators. The arrangement of the decision threshold and sampling time of these comparators is discussed, and the phase and frequency detection characteristic of such an arrangement is evaluated. The technique is validated through a proof‐of‐concept 12.5 Gbit/s CDR chip that is fabricated in 90nm CMOS.
Effect of electric field on exciton in high‐purity GaAs epilayer measured at room temperature
Authors: Kayastha M.S. , Sapkota D.P. , Takahashi M. , Wakita K. 
Published: January 2013

The excitonic electroabsorption has been investigated for a high‐purity GaAs epilayer of 10 µm thickness at room temperature and clear red‐shift (≃1.44 nm) of the excitonic absorption peak has been observed. An extinction ratio over 10 dB has been obtained with an applied voltage of 11 V, which is nearly five times larger than the theoretical estimation without considering the exciton. This may be the first observation for of a surface normal structure with a polyaniline as a transparent Schottky electrode. The insertion loss is estimated to be 3 dB. This relative low driving voltage for a bulk configuration without quantum wells is due to high‐purity GaAs.
ΔΣ digital‐RF transmitter with reduced LO leakage using segmented butterfly shufflers
Authors: Shim S. , Lee H.Y. , Choi J.‐H. , Yu H.‐K. , Hong S. 
Published: January 2013

Presented is a digital‐RF transmitter using multi‐bit ΔΣ modulators with noise‐shaped segmentation and butterfly shufflers for shaping mismatches between digital‐to‐RF converter (DRFC) cells. The segmented butterfly shufflers prevent mismatch errors of DRFCs from aggravating the linearity and the LO leakage of the transmitter. A prototype based on a digitally‐intensive top‐down design is fabricated in 90 nm CMOS process. Measurement results for wideband‐code division multiple access demonstrate an adjacent channel leakage ratio (ACLR) (5 MHz/10 MHz) of −49.6 dBc/−53.9 dBc and an Error Vector Magnitude of 1.89% with a main channel output power of −0.1 dBm centred at 1.95 GHz.
High efficiency GaN current‐mode class‐D amplifier at 2.6 GHz using pure differential transmission line filters
Authors: Sigg A. , Heck S. , Bräckle A. , Berroth M. 
Published: January 2013

In class‐D operation the impedances of the output network at each harmonic frequency at the intrinsic terminals of the transistors are of main importance. This reported work demonstrates a new concept using pure differential transmission line filters for the matching of these impedances. Furthermore, de‐embedding techniques are used to compensate the impedance transforming characteristics of the package parasitics. A current‐mode class‐D (CMCD) amplifier with a power‐added efficiency (PAE) of 62% and a corresponding output power of 29.5 W at 2.6 GHz has been demonstrated. To the authors' knowledge, these are the highest reported values of the PAE as well as the output power at this frequency for a CMCD.
Behavior, Growth and Habitat Selection of Hatchery Esocids Reared with Artificial Vegetation
Authors: Einfalt Lisa M. , Wojcieszak Douglas B. , Wahl David H. 
Published: January 2013

AbstractWe evaluated the effect of adding artificial vegetation to the rearing environment on behavior, habitat selection, and growth of hatchery esocids in laboratory experiments. First, Muskellunge Esox masquinongy and the hybrid Tiger Muskellunge (Muskellunge × Northern Pike E. lucius) resided separately in pools either with or without artificial vegetation (250 stems/m2) for 2 weeks. Both taxa raised in vegetated pools dispersed and spent more time away from the sides of the pools than did individuals residing in open pools. Tiger Muskellunge in vegetated pools also startled less often than fish in open pools, whereas vegetation did not decrease Muskellunge startle behavior. We next examined habitat selection between esocids raised in tanks with and without vegetation. Fish were tested in semivegetated pools, and for Tiger Muskellunge acclimated in vegetation, more fish (80%) used the vegetated half of the pool compared with fish raised in open tanks (61%). Muskellunge, regardless of treatment, spent a high proportion (>90%) of time in vegetation. Finally, growth of both taxa was similar between esocids reared in vegetated tanks compared with esocids reared in open tanks. The presence of artificial vegetation in tanks caused changes in behavior for both esocid taxa, but Tiger Muskellunge were more flexible in modifying their behavior. Behavioral responses resulting from exposure to vegetation could increase survival after stocking in lakes.
Model prediction vs. reality—testing the predictions of a European eel (Anguilla anguilla) stock dynamics model against the in situ observation of silver eel escapement in compliance with the European eel regulation
Authors: Prigge E. , Marohn L. , Oeberst R. , Hanel R. 
Published: January 2013

Abstract
Prigge, E., Marohn, L., Oeberst R., and Hanel, R. 2013. Model prediction vs. reality—testing the predictions of a European eel (Anguilla anguilla) stock dynamics model against the in situ observation of silver eel escapement in compliance with the European eel regulation – ICES Journal of Marine Science, 70: 309–318. A direct monitoring of European silver eel (Anguilla anguilla, L) escapement from rivers and estuaries has been proven to be challenging, and a Europe-wide documentation of escaping silver eel numbers therefore hardly seems realistic. To reinforce management decisions, policy-makers are thus widely reliant on the accuracy of escapement models. A 3-year programme of silver eel escapement monitoring was undertaken to compile model input data and revise an eel population model (German Eel Model II; GEM II) already used in the decision-making process of management authorities. By compiling necessary input data and analysing vital system-specific population characteristics, it was possible to compare the documented silver eel escapement with the modelled potential silver eel escapement. Resulting model predictions were close to actually monitored escapement numbers, which were distinctly lower than reference escapement values for the same freshwater system given in the implementation report of the German Eel Management Plans. Applying different commercial and recreational catch scenarios revealed the sensitivity of the model. The results show the potential of the GEM II and highlight the importance of high-quality input data to use model predictions as the basis for management measures.
“New leadership” and creating the high performance organisation: part 1
Authors: Coulson‐Thomas Colin 
Published: January 2013

PurposeIn some respects traditional leadership is not working. The aim of this two‐part paper is to summarise key findings of a five year investigation into quicker and more affordable routes to creating high performance organisations. It identifies some aspects of the “new leadership” that is required and how the strategic adoption of performance support can facilitate the changes required and deliver multiple objectives. This first part introduces “new leadership” and performance support.Design/methodology/approachA programme of critical success factor, “issue” and other surveys was complemented with a five year evaluation of more recent case studies to understand early adoptions of performance support and to assess their results and implications. The applications examined were discussed with the relevant technical architect and the results obtained corroborated with commissioner/user performance data and/or documented assessments/reactions.Findings“New leadership” is less about “top‐down” leading and more about providing “bottom‐up” support, particularly of those who contribute to key corporate objectives. It requires a different balance and focus in a number of areas and can be facilitated by the strategic adoption of performance support which can deliver multiple benefits and offers a quicker and more affordable route to the high performance organisation.Research limitations/implicationsFurther investigation is required of the implications of the findings for people and organisations.Practical implicationsA cheaper and more cost‐effective alternative to expensive, lengthy and disruptive change and transformation programmes has been demonstrated which can deliver essential elements of “new leadership”, boost performance, cut costs, reduce risks and stress, ensure compliance and generate high returns on investment. Despite its advantages the more widespread adoption of “new leadership” and performance support might require a re‐energising of corporate boards.Social implicationsThere is potential for making difficult jobs easier and less stressful for many people.Originality/valueThe paper summarises the main findings of an investigation that has identified a requirement for “new leadership” and an approach which if strategically adopted can facilitate its introduction. Important aspects of the shift of emphasis and focus required by “new leadership” are identified, along with the central contribution that performance support can make to its beneficial adoption.
Employee training: ticking the box or building business competence?
Authors: Cadman Charlie 
Published: January 2013

PurposeThe rise in regulatory requirements for health and safety skills certification over the past two decades prompted a tick box approach to training, with organisations simply undertaking the minimum requirements in order to maintain compliance. But the planned reduction in health and safety red tape combined with growing industry demand for proven skills from contractors and suppliers, as well as the cross skilling that has become so important during the on going economic downturn, is changing attitudes. The purpose of this paper is to explore this.Design/methodology/approachThe paper includes a viewpoint and a case study.FindingsHaving learnt the value of up‐skilling staff in recent years to cope with a recessionary economy, organisations are now actively embracing the value of both company specific and industry standard training to build skills and demonstrate to customers a commitment to quality.Originality/valueEnsuring employees have the right skills goes far beyond meeting regulatory obligations. As this article explains, there is a real opportunity to build strong, long term employee competency, minimise accidents and create the skills base that reflects the business needs of the organisation.
Five steps to a recession proof career
Authors: Reuter Jan 
Published: January 2013

PurposeWould you like to take control of your career so that you are not at the whim of the employer or the economy? The aim of this paper is to learn how to apply successful small business strategies to your career so that you are in charge.Design/methodology/approachLearn how to apply successful small business strategies to your career so that you are in charge. This article will help you to look at your career through the lens of an entrepreneur taking a product to market – in this case the product is you! The five steps include: assessing the strengths, capabilities and skills of your product; reviewing what the market wants; analysing the gaps between your product and what the market wants; planning the further development of your product; and marketing your product.FindingsAs of July 9 the author is launching a survey to gather success stories of how people have recession proofed their careers. However at the time of this writing the findings from that survey are not available.Practical implicationsThese practical steps are easy to apply and can give your career the boost it needs in these uncertain economic times.Originality/valueWhile many authors have given the advice to either treat your career as a business or to be the Chief Executive Officer of your career, “Five steps to a recession proof career” provides practical advice on how to actually achieve that goal.
Original editions of Chinese gazetteers in the Yale East Asia Library
Authors: Li Tang 
Published: January 2013

PurposeChinese gazetteers are one of the most important primary sources for the study of history of Chinese economy, politics, culture, military, and science and technology. Since the very beginning, the Yale East Asia Library has been keen on collecting Chinese gazetteers. However, unlike its peer research libraries in the USA, the Yale East Asia Library had never compiled a catalog or written an article about its gazetteer collection. The purpose of this paper is to systematically review, for the first time, original editions of Chinese gazetteers held in the Yale East Asia Library to reveal the holdings and research value.Design/methodology/approachThe author conducted a survey of original editions of Chinese gazetteers in the Yale East Asia Library by searching the Yale online library catalog and comparing with existing catalogs of Chinese local gazetteers compiled by other research libraries in the USA. The paper focuses on the edition, coverage, rarity and variety of Yale's holdings.FindingsAccording to the author's findings and preliminary research, Yale holds approximately 337 original Chinese gazetteers. The majority of them is rarely found in other North American research libraries and thus has high research value. They cover almost all provinces and municipalities in China and have a great variety of types.Research limitations/implicationsAlthough the author tried to use various search strategies to look up in the Yale online library catalog to ensure high retrieval, the results here may not be accurate. Also it is likely that a number of Chinese gazetteers are not recorded in the Yale online library catalog because of backlogs. A physical survey of Chinese gazetteer holdings at Yale and more research need to be done in the future.Originality/valueThis paper is the first of its kind to provide a systematic review of original editions of Chinese gazetteers held in the Yale East Asia Library.
A directory to data on libraries and librarianship
Authors: Ondrusek Anita L. 
Published: January 2013

PurposeElectronically stored data on libraries, librarians, library users, and the information industry that supports library collections can assist librarians in projecting trends for the future directions of the profession. The purpose of this paper is to direct librarians to a selected list of providers of this data and their publications, particularly those sources that aggregate data in systematic, accessible formats.Design/methodology/approachWeb sites of the organizations that collect data on libraries were examined for data reports generated either from research projects or from periodic reports.FindingsThere is a wealth of free data from ongoing research available on the web. In addition, there are proprietary data sets that librarians who need that specialized data should consider acquiring.Research limitations/implicationsLIS professionals require access to current and retrospective data to shape future research and inform decision making.Originality/valueThe article fills the need for an annotated directory to data sources specific to the needs of libraries and procurement information for those sources.
Public sector reform: an overview of recent literature and research on NPM and alternative paths
Authors: De Vries Michiel , Nemec Juraj 
Published: January 2013

Purpose– The purpose of this article is to discuss the idea that new public management (NPM) would bepassé.Design/methodology/approach– The article is based on a review of existing theories.Findings– The article argues that NPM has two dimensions, namely the minimization of the role of governmentvis-à-vissociety and the improvement of the internal performance of the public sector. Whereas the first dimension is indeed more and more disputed nowadays this does not imply this also goes for the second dimension. The conclusion of this article calls for explanatory empirical research in order to explain the increasing variance in reforms among countries, by investigating which factors are determinative for decisions by governments to turn one way or the other.Practical implications– It is far from certain which way the public sector is heading in the so-called post-NPM era. Some countries are still implementing NPM-kind of reforms, either by downsizing or by introducing performance management. Other countries have chosen alternative paths. All this implies an increased variance between countries in the direction public sector reforms take. It requires quite different support from administrative sciences compared to the one-size-fits-all recommendations for public sector reforms – in conformity with the maxims of NPM – as witnessed in the past decades.Originality/value– The article contributes to the discussion about the role of NPM today. It presents original conclusions about diverging developments based on the unique comprehensive literature review on the topic.