Characterisation and Performance of Pindan Soils Modified with Polymer Stabilisers

Moisture susceptibility of materials is an important aspect when pavements are designed as moisture can weaken bonds between aggregates. Pindan is a red soil, known as a moisture sensitive soil. This project focuses on fundamental information of Pindan soil and its improved performances using polymer stabilisers, then determines the chemical and physical bonding mechanisms associated with the polymer stabilisers. Chemical and microstructural properties were examined and linked with the mechanical properties

Spectral Decomposition of Missing Transverse Energy at Hadron Colliders

We propose a spectral decomposition to systematically extract information of dark matter at hadron colliders. The differential cross section of events with missing transverse energy (MET) can be expressed by a linear combination of basis functions. In the case of $s$-channel mediator models for dark matter particle production, basis functions are identified with the differential cross sections of sub-processes of virtual mediator and visible particle production while the coefficients of basis functions correspond to dark matter invariant mass distribution in the manner of the K\"all\'en-Lehmann spectral decomposition. For a given MET data set and mediator model, we show that one can differentiate a certain dark matter-mediator interaction from another through spectral decomposition.Comment: 6+4 pages, 6 figures, PRL versio

Two Dimensional Poynting Flux Dominated Flow onto a Schwarzschild Black Hole

We discuss the dynamics of the accretion flow onto a black hole driven by Poynting flux in a simplified model of a two-dimensional accretion disk. In this simplified model, the condition of the stationary accretion flow is found to impose a nontrivial constraint on the magnetic field configuration. The effect of the magnetic field on the accretion flow is discussed in detail using the paraboloidal and hyperboloidal type configuration for the poloidal structure suggested by Blandford in 1976. It is demonstrated explicitly that the angular velocity of the disk, $\Omega_D$, deviates from the Keplerian angular velocity. The angular velocity of the rigidly-rotating magnetic surface, $\Omega_F$, does not have to be the same as the angular velocity of the disk for the paraboloidal type configuration. But for the hyperboloidal type configuration, it is found that we can set $\Omega_F = \Omega_D$, which corresponds to an accretion disk of perfect conductor. We discuss the numerical solutions of the stream equation for stationary accretion flow in the Schwarzschild background using a paraboloidal type configuration. The dynamics of the accretion disk is found to depend strongly on the ratio of the accretion rate to the magnetic field strength.Comment: 9 pages, 3 figure

LITERATURA MIĘDZYKULTUROWA A KULTUROWE ODTWARZANIE: PRZYPADEK HANJUNGNOK – KOREAŃSKIEJ AUTOBIOGRAFII

This paper is an investigation how cultural perception could be embedded in language and literature and how this helps different analyses on a same historical event. The article includes the comparison between a work of classical Korean literature, Hanjungnok (한중록), and an English-translated version of it, The Memoirs of Lady Hyekyŏng, translated by Kim-Haboush, and a work of a British novel, The Red Queen, written by Margaret Drabble. The comparison is to explore the language use regarding a perception of family relations and of gender in each version of writing. This paper concludes that authors’ and audience’s language and cultural background would influence on perceiving and analysing literature and its context so that each interpretation could be differentiated, even with the actual historical event.이 연구는 언어와 문학 속에 문화적 인식이 담겨 있는 지와 이러한 문화적 인식이 하나의 역사적 사건에 대해서 어떻게 다른 해석을 하는 지를 살펴본다. 이를 위해, 궁중소설인 한중록과, 킴-하부쉬가 영어로 번역한 한중록의 번역본, 마지막으로, 소설가 마가렛 드래블이 집필한 소설 '더 레드 퀸 (붉은 왕세자빈)'에서 사용된 언어들을 비교한다. 특히, 가족과 젠더에 관한 인식에 대해서 조사한다. 이 요소들을 통해서 작가와 독자들의 언어적, 문화적 배경에 따라서 문학을 인식하고 적용하는 것은 다르며, 또한 사실을 기반으로 한 역사적 상황에 대해서도 다른 해석이 가능할 수 있다는 것을 밝힌다.Niniejszy artykuł skupia się na zjawisku percepcji kulturowej zanurzonej w literaturze i języku a także na tym, w jakim stopniu jest ono przydatna w analizach zjawisk historycznych. Tekst zawiera porównanie klasycznego dzieła koreańskiego, Hanjungnok (한중록) oraz jego angielskiego przekładu Kim Haboush – The Memoirs of Lady Hyekyŏng i powieści Margaret Drabble The Red Queen. Zestawienie to pozwala na porównanie języka wykorzystanego w tych powieściach w aspektach relacji rodzinnych i rodzaju każdej z tych pozycji. Artykuł prowadzi do wniosku, że tło kulturowe oraz język autora i odbiorcy wpływają na percepcję i analizę literatury z jej kontekstem. Każda z tych interpretacji różni się, mimo, że odnoszą się do tych samym faktów historycznych

Entropic measure of directional emissions in microcavity lasers

We propose a noble notion of the directional emission in microcavity lasers. First, Shannon entropy of the far-field profiles in the polar coordinate can quantify the degree of unidirectionality of the emission, while previous notions about the unidirectionality can not efficiently measure in the robust range against a variation of the deformation parameter. Second, a divergence angle of the directional emission is defined phenomenologically in terms of full width at half maximum, and it is barely applicable to a complicated peak structure. However, Shannon entropy of semi-marginal probability of the far-field profiles in the cartesian coordinate can present equivalent results, and moreover it is applicable to even the cases with a complicated peak structure of the emission

Chamber measurement methods and aeration effect on greenhouse gas fluxes during composting

Composting has the potential to mitigate methane (CH4) and nitrous oxide (N2O) emissions from manure.  The heterogeneous nature of emitting surfaces makes it difficult to quantify these emissions.  CH4 and N2O fluxes measured using eight small chambers (0.72 m2) and a mega chamber (90 m2) were compared, and the effect of aeration on the fluxes during composting was studied.  Two batches of compost were placed in three channels and 2-3 small flux chambers were deployed on each channel.  The channels were enclosed by a building serving as a mega chamber.  Chamber location significantly affected gas fluxes, pointing to strong spatial heterogeneity.  Mean CH4 fluxes from the small chambers were similar or 1.4 times higher compared to the mega chamber.  Mean N2O fluxes from the small chambers were 50%-55% lower compared to the mega chamber.  Channel edges, not captured by the small chambers, were potentially significant ‘hot spots’ for N2O production.  When only small chambers are used for flux measurements, a large number should be strategically positioned to cover different areas of the emitting surface so as to capture a representative flux.  On the other hand, if a few small chambers are used, they should be moved frequently to different locations on the emitting surface.  Temporal variations in CH4 and N2O fluxes were similar for all the chambers, including periods with active aeration.  Correlation of total aeration time with CH4 fluxes was insignificant (r = -0.097), but was positive with N2O (r = 0.556).  The flushing of stored CH4 at the onset of aeration, likely promoted fluxes, as opposed to the expected flux decrease with higher aeration time.  The purging of stored N2O enhanced the expected stimulation of N2O production at high aeration times, resulting in the positive trend observed for N2O fluxes.  Our results suggest that a mega chamber that covers a larger emitting surface area can avoid biases in flux estimates due to spatial variability of the source.   Keywords: chamber measurements, compost, greenhouse gases, aeration, flu

Half-Skyrmions, Tensor Forces and Symmetry Energy in Cold Dense Matter

In a previous article, the 4D half-skyrmion (or 5D dyonic salt) structure of dense baryonic matter described in crystalline configuration in the large $N_c$ limit was shown to impact nontrivially on how anti-kaons behave in compressed nuclear matter with a possible implication on an "ice-9" phenomenon of deeply bound kaonic matter and condensed kaons in compact stars. We extend the analysis to make a further prediction on the scaling properties of hadrons that have a surprising effect on the nuclear tensor forces, the symmetry energy and hence on the phase structure at high density. We treat this problem relying on certain topological structure of chiral solitons. Combined with what can be deduced from hidden local symmetry for hadrons in dense medium and the "soft" dilatonic degree of freedom associated with the trace anomaly of QCD, we uncover a novel structure of chiral symmetry in the "supersoft" symmetry energy that can influence the structure of neutron stars.Comment: 8 pages, 4 figures; contents unchanged but expanded for a journa