bluuebunny/crossref_metadata_2025_split huggingface dataset:
Radiative Transfer in Molecular Clouds
Authors: Juvela M. 
Published: April 2011

AbstractInformation of astronomical objects is obtained mainly through their radiation. Thus, the radiative transfer problem has a central role in all astrophysical research. Basic radiative transfer analysis or more complex modeling is needed both to interpret observations and to make predictions on the basis of numerical models. In this paper I will discuss radiative transfer in the context of interstellar molecular clouds where the main scientific questions involve the structure and evolution of the clouds and the star formation process. The studies rely on the analysis of spectral line and dust continuum observations. After a discussion of the corresponding radiative transfer methods, I will examine some of the current challenges in the field. Finally, I will present three studies where radiative transfer modeling pays a central role: the polarized dust emission, the Zeeman effect in emission lines, and the continuum emission from dense cloud cores.
Adaptable Radiative Transfer Innovations for Submillimeter Telescopes (ARTIST)
Authors: Padovani Marco , Jørgensen Jes K. , Bertoldi Frank , Brinch Christian , Frau Pau , Girart Josep Miquel , Hogerheijde Michiel , Juhasz Attila , Kuiper Rolf , Schaaf Reinhold , Vlemmings Wouter H. T. 
Published: April 2011

AbstractSubmillimeter observations are a key for answering many of the big questions in modern-day astrophysics, such as how stars and planets form, how galaxies evolve, and how material cycles through stars and the interstellar medium. With the upcoming large submillimeter facilities ALMA and Herschel a new window will open to study these questions. ARTIST is a project funded in context of the European ASTRONET program with the aim of developing a next generation model suite for comprehensive multi-dimensional radiative transfer calculations of the dust and line emission, as well as their polarization, to help interpret observations with these groundbreaking facilities.
Gas dynamics in whole galaxies: SPH
Authors: Dobbs Clare 
Published: April 2011

AbstractI review the progress of SPH calculations for modelling galaxies, and resolving gas dynamics on GMC scales. SPH calculations first investigated the response of isothermal gas to a spiral potential, in the absence of self gravity and magnetic fields. Surprisingly though, even these simple calculations displayed substructure along the spiral arms. Numerical tests indicate that this substructure is still present at high resolution (100 million particles, ~10 pc), and is independent of the initial particle distribution. One interpretation of the formation of substructure is that smaller clouds can agglomerate into more massive GMCs via dissipative collisions. More recent calculations have investigated how other processes, such as the thermodynamics of the ISM, and self gravity affect this simple picture. Further research has focused on developing models with a more realistic spiral structure, either by including stars, or incorporating a tidal interaction.
Star Formation and Gas Dynamics in Galactic Disks: Physical Processes and Numerical Models
Authors: Ostriker Eve C. 
Published: April 2011

AbstractStar formation depends on the available gaseous “fuel” as well as galactic environment, with higher specific star formation rates where gas is predominantly molecular and where stellar (and dark matter) densities are higher. The partition of gas into different thermal components must itself depend on the star formation rate, since a steady state distribution requires a balance between heating (largely from stellar UV for the atomic component) and cooling. In this presentation, I discuss a simple thermal and dynamical equilibrium model for the star formation rate in disk galaxies, where the basic inputs are the total surface density of gas and the volume density of stars and dark matter, averaged over ~kpc scales. Galactic environment is important because the vertical gravity of the stars and dark matter compress gas toward the midplane, helping to establish the pressure, and hence the cooling rate. In equilibrium, the star formation rate must evolve until the gas heating rate is high enough to balance this cooling rate and maintain the pressure imposed by the local gravitational field. In addition to discussing the formulation of this equilibrium model, I review the current status of numerical simulations of multiphase disks, focusing on measurements of quantities that characterize the mean properties of the diffuse ISM. Based on simulations, turbulence levels in the diffuse ISM appear relatively insensitive to local disk conditions and energetic driving rates, consistent with observations. It remains to be determined, both from observations and simulations, how mass exchange processes control the ratio of cold-to-warm gas in the atomic ISM.
Shock-induced star cluster formation in colliding galaxies
Authors: Saitoh Takayuki R. , Daisaka Hiroshi , Kokubo Eiichiro , Makino Junichiro , Okamoto Takashi , Tomisaka Kohji , Wada Keiichi , Yoshida Naoki 
Published: April 2011

AbstractWe studied the formation process of star clusters using high-resolutionN-body/smoothed particle hydrodynamics simulations of colliding galaxies. The total number of particles is 1.2×108for our high resolution run. The gravitational softening is 5 pc and we allow gas to cool down to ~10 K. During the first encounter of the collision, a giant filament consists of cold and dense gas found between the progenitors by shock compression. A vigorous starburst took place in the filament, resulting in the formation of star clusters. The mass of these star clusters ranges from 105−8M⊙. These star clusters formed hierarchically: at first small star clusters formed, and then they merged via gravity, resulting in larger star clusters.
Galaxy formation hydrodynamics: From cosmic flows to star-forming clouds
Authors: Bournaud Frédéric 
Published: April 2011

AbstractMajor progress has been made over the last few years in understanding hydrodynamical processes on cosmological scales, in particular how galaxies get their baryons. There is increasing recognition that a large part of the baryons accrete smoothly onto galaxies, and that internal evolution processes play a major role in shaping galaxies – mergers are not necessarily the dominant process. However, predictions from the various assembly mechanisms are still in large disagreement with the observed properties of galaxies in the nearby Universe. Small-scale processes have a major impact on the global evolution of galaxies over a Hubble time and the usual sub-grid models account for them in a far too uncertain way. Understanding when, where and at which rate galaxies formed their stars becomes crucial to understand the formation of galaxy populations. I discuss recent improvements and current limitations in “resolved” modeling of star formation, aiming at explicitly capturing star-forming instabilities, in cosmological and galaxy-sized simulations. Such models need to develop three-dimensional turbulence in the ISM, which requires parsec-scale resolution at redshift zero.
A Guide to Comparisons of Star Formation Simulations with Observations
Authors: Goodman Alyssa A. 
Published: April 2011

AbstractWe review an approach to observation-theory comparisons we call “Taste-Testing.” In this approach, synthetic observations are made of numerical simulations, and then both real and synthetic observations are “tasted” (compared) using a variety of statistical tests. We first lay out arguments for bringing theory to observational space rather than observations to theory space. Next, we explain that generating synthetic observations is only a step along the way to the quantitative, statistical, taste tests that offer the most insight. We offer a set of examples focused on polarimetry, scattering and emission by dust, and spectral-line mapping in star-forming regions. We conclude with a discussion of the connection between statistical tests used to date and the physics we seek to understand. In particular, we suggest that the “lognormal” nature of molecular clouds can be created by the interaction of many random processes, as can the lognormal nature of the IMF, so that the fact that both the “Clump Mass Function” (CMF) and IMF appear lognormal does not necessarily imply a direct relationship between them.
Legal authority and savagery in judicial rhetoric: sexual violence and the criminal courts
Authors: Gurnham David 
Published: April 2011

AbstractThis article explores narrative devices in legal rhetoric, and the use of these devices for asserting the authority to distinguish lawful from unlawful inflictions of bodily harm. The argument made here is that the moral language adopted by judges in criminal appeal judgments on risky sexual and/or violent consensual acts embraces a set of interconnecting narratives otherwise observed in literature, and relating to gender, sexuality and race. I try to show how the reading of these legal cases is enriched by identifying these narratives, locating them as rhetorical strategies and reflecting on their uses in judicial decision-making. In particular, I argue that in the case-law explored here, these interconnected narratives are deployed in order to assert law's dominance over an imagined ‘savage’ other. Through this ongoing repudiation of savagery the distinctions between normative and non-normative, violent and non-violent, lawful and unlawful are constructed.
Integrating human rights in emerging regulation of Corporate Social Responsibility: the EU case
Authors: Buhmann Karin 
Published: April 2011

AbstractThis article analyses the EU Commission's policy-based approach to regulating Corporate Social Responsibility (CSR) and the role of international human rights law as a normative source for the regulatory output in two initiatives launched in 2002 and 2006. The article argues as a starting point that the understanding of CSR as ‘beyond law’ tends to shroud the contributions that international human rights law and legal theory based regulatory technique lend to CSR normativity and regulation, not only outside the EU but also within. The EU experience shows that due to power relations and their impact on multi-stakeholder negotiations and their outcome, this potential does necessarily unfold. It also shows that the procedural design of reflexive multi-stakeholder regulatory processes is significant for bringing forth the normative contributions of international law to CSR in public–private regulation. Finally, the article suggests that within the public policy context in which EU CSR regulation is emerging, the normative role of international human rights law which the Commission suggests for CSR in Europe and the application of the reflexive regulatory technique contribute to a substantive as well as procedural juridification of CSR, especially in the formative stage of defining CSR normativity. The latter adds a significant new perspective to the understanding of CSR and its relation to law, although it need not conflict with the understanding of CSR being ‘voluntary’ in the sense of action beyond direct legal obligations.
Challenging homophobic bullying in schools: the politics of progress
Authors: Monk Daniel 
Published: April 2011

AbstractIn recent years homophobic bullying has received increased attention from NGOs, academics and government sources and concern about the issue crosses traditional moral and political divisions. This article examines this ‘progressive’ development and identifies the ‘conditions of possibility’ that have enabled the issue to become a harm that can be spoken of. In doing so it questions whether the readiness to speak about the issue represents the opposite to prohibitions on speech (such as the notorious Section 28) or whether it is based on more subtle forms of governance. It argues that homophobic bullying is heard through three key discourses (‘child abuse’, ‘the child victim’ and ‘the tragic gay’) and that, while enabling an acknowledgement of certain harms, they simultaneously silence other needs and experiences. It then moves to explore the aspirational and ‘liberatory’ political investments that underlie these seemingly ‘common-sense’ descriptive discourses and concludes with a critique of the quasi-criminal responses that the dominant political agenda of homophobic bullying gives rise to. The article draws on, and endeavours to develop a conversation between, critical engagements with the contemporary politics of both childhood and sexuality.
Habeas Corpus: from England to Empire
Authors: Lobban Michael 
Published: April 2011

The ‘Great Writ’ of habeas corpus has long had an iconic status as the ‘writ of liberty’ which ensured that no person could be detained in prison without being put to trial by a jury of his peers. According to the traditional version, popularised by Whiggish constitutional writers from the late seventeenth century onwards, the English constitution as embodied in the common law had, since time immemorial, striven to protect the fundamental rights of Englishmen and women, which included the right to personal liberty. The common law had supplied the writ of habeas corpus, which secured the provision of Magna Carta, that no freeman be imprisoned save by the judgment of a jury of his peers. In the course of the seventeenth century, the Whig version ran, kings with an absolutist bent sought to undermine ancient liberties, by claiming prerogative powers to imprison without trial, and by appointing supine judges who would not protect people's liberties. It took the triumph of Parliament to restore and perfect them. For William Blackstone, one of the key statutes which secured ‘the complete restitution of English liberty’ was the Habeas Corpus Act of 1679, ‘that second magna carta’. As Blackstone put it:
‘Magna carta only, in general terms, declared, that no man shall be imprisoned contrary to law: the habeas corpus act points him out effectual means, as well to release himself, though committed even by the king in council, as to punish all those who shall thus unconstitutionally misuse him.’
Infinite multiplicity for an inhomogeneous supercritical problem in entire space
Authors: Lai Baishun , Ge Zhihao 
Published: April 2011

In this paper, we will prove the existence of infinitely many positive solutions to the following supercritical problem by using the Liapunov-Schmidt reduction method and asymptotic analysis:

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\begin{eqnarray*} \left \{ \begin {array}{ll} \Delta u + u^{p}+f(x)=0,\ \ u>0\ \ \mbox {in}\ \mathbb {R}^{n},\\ \lim _{|x|\to \infty }u(x)\to 0. \end{array} \right . \end{eqnarray*}
A Conserved, Mg2+-Dependent Exonuclease Degrades Organelle DNA duringArabidopsisPollen Development
Authors: Matsushima Ryo , Tang Lay Yin , Zhang Lingang , Yamada Hiroshi , Twell David , Sakamoto Wataru 
Published: April 2011

AbstractIn plant cells, mitochondria and plastids contain their own genomes derived from the ancestral bacteria endosymbiont. Despite their limited genetic capacity, these multicopy organelle genomes account for a substantial fraction of total cellular DNA, raising the question of whether organelle DNA quantity is controlled spatially or temporally. In this study, we genetically dissected the organelle DNA decrease in pollen, a phenomenon that appears to be common in most angiosperm species. By staining mature pollen grains with fluorescent DNA dye, we screened Arabidopsis thaliana for mutants in which extrachromosomal DNAs had accumulated. Such a recessive mutant, termed defective in pollen organelle DNA degradation1 (dpd1), showing elevated levels of DNAs in both plastids and mitochondria, was isolated and characterized. DPD1 encodes a protein belonging to the exonuclease family, whose homologs appear to be found in angiosperms. Indeed, DPD1 has Mg2+-dependent exonuclease activity when expressed as a fusion protein and when assayed in vitro and is highly active in developing pollen. Consistent with the dpd phenotype, DPD1 is dual-targeted to plastids and mitochondria. Therefore, we provide evidence of active organelle DNA degradation in the angiosperm male gametophyte, primarily independent of maternal inheritance; the biological function of organellar DNA degradation in pollen is currently unclear.
Comparison of catechins and volatile compounds among different types of tea using high performance liquid chromatograph and gas chromatograph mass spectrometer
Authors: Wang Kunbo , Liu Fang , Liu Zhonghua , Huang Jianan , Xu Zhongxi , Li Yinhua , Chen Jinhua , Gong Yushun , Yang Xinghe 
Published: April 2011

SummaryAs tea is one of the most popular beverages consumed worldwide, it is important for customers and business investigators to develop an easy and reliable method to discriminate between different types of teas from each other. A total of eighty‐seven types of various white, green, oolong, black and Puer teas were collected from the major tea estates in China, and their catechin contents and volatile compounds were compared by high performance liquid chromatograph and gas chromatograph mass spectrometer. It was found green tea contained the highest concentrations of total catechins, (−)‐epicatechin gallate (ECG) and (−)‐epigallocatechin gallate (EGCG), while oolong teas contained the highest concentrations of (−)‐epigallocatechin (EGC) among these five types of teas. The aroma composition and their quantities in different types of teas varied quite widely. The concentration of ECG, EGCG, pentanal, hexanal, methyl jasmonate, indole, (E,E)‐2,4‐hexadienal and 1,2,3‐trimethoxybenzene was shown to be different and could be used to discriminate white, green, oolong, black and Puer teas. The result showed that different types of teas could be partially classified by cluster analysis using index of individual catechins and volatile components.
Lipid and protein stability of partially defatted walnut flour (Juglans regiaL.) during storage
Authors: Labuckas Diana , Maestri Damián , Lamarque Alicia 
Published: April 2011

SummaryPartially defatted walnut flour (WF) was stored (25 °C, 800 Lux) for an 8‐month period and evaluated monthly in some protein properties and oil oxidative parameters. Transparent plastic‐laminated (WFPL) and plastic‐laminated, aluminium‐coated (WFAC) packages were used. During the first 3 months, samples were more susceptible to endogenous hydrolysis; an increase in soluble peptide concentration was determined for both WFAC and WFPL. Minor changes between WFAC and WFPL were observed in protein electrophoretic patterns along storage period, but no differences were determined in total protein solubility. However, a progressive reduction in water‐holding capacity (47% from time 0 to month 8) was observed for WFPL. A major effect of packaging material was found on lipid‐quality parameters. Packaging materials’ barrier to light effectively protect WF against polyunsaturated FA degradation and oil oxidation. Lipids from WF stored in plastic‐laminated packages showed decreasing double‐bond index values (from 1.71 at initial time, to 1.45 after 6 months of storage) and increasing oxidation rates along storage test. Aluminium‐coated packages can be used to keep quality of WF for 8 months at room temperature.
Instrumental and sensory evaluation of cooked pasta during frozen storage
Authors: Olivera Daniela F. , Salvadori Viviana O. 
Published: April 2011

SummaryFood consumption patterns have changed significantly during the last years, showing an increase in the consumption of convenience foods. Frozen foods represent an important segment of this market. The aim of the present paper was to study the influence of frozen storage on the quality of cooked organic tagliatelle. Instrumental measurements of different quality parameters (moisture content, colour, textural and rheological characteristics of frozen cooked pasta) were performed during twelve months of storage. The sensory properties of pasta were also evaluated by means of an acceptability study. In general, both instrumental and sensory analysis found that frozen storage affects negatively the acceptability of cooked pasta. The advantages obtained through fast freezing procedures are not maintained along storage, being hardness (instrumental) and consistency (sensory) the most relevant quality indices. Finally, the shelf life of the product was calculated as 3.6 and 3.8 months in the cryogenic device and air‐blast tunnel, respectively, based on simple kinetic models.
Concentration of n‐3 polyunsaturated fatty acids in cholesterol‐reduced cod‐liver oil by lipases
Authors: Lee Jung Eun , Chang Yoon Hyuk , Ganesan Palanivel , Kwak Hae‐Soo 
Published: April 2011

SummaryThis study was conducted to elucidate the effects of different lipases originated from Candida rugosa (CR), porcine pancreas (PP) and Aspergillus niger (AN) on the degree of hydrolysis (DH) in cholesterol‐reduced cod‐liver oil (87.5%) and evaluate the changes in n‐3 polyunsaturated fatty acid concentrations in the oil hydrolysed by the lipases. The lipase‐catalysed hydrolysis of cholesterol‐reduced cod‐liver oil was performed at 37 °C for 8 h. Among all the lipase samples studied, DH in the oil after lipase‐catalysed hydrolysis followed the decreasing order: CR lipase (70.01%) > PP lipase (26.18%) > AN lipase (18.57%). Triacylglycerol levels in the oil hydrolysed by all the lipases studied decreased, while mono‐ and diacylglycerol levels increased during lipase‐catalysed hydrolysis. The eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) concentrations in cholesterol‐reduced cod‐liver oil hydrolysed by the CR lipase were remarkably higher than those by the PP or AN lipase. Thus, it is suggested in this study that the CR lipase appears to be most suitable for producing and n‐3 polyunsaturated fatty acids including EPA and DHA concentrates from cholesterol‐reduced cod‐liver oil.