Decay of highly-correlated spin states in a dipolar-coupled solid

We have measured the decay of NMR multiple quantum coherence intensities both under the internal dipolar Hamiltonian as well as when this interaction is effectively averaged to zero, in the cubic calcium fluoride (CaF2) spin system and the pseudo one-dimensional system of fluoroapatite. In calcium fluoride the decay rates depend both on the number of correlated spins in the cluster, as well as on the coherence number. For smaller clusters, the decays depend strongly on coherence number, but this dependence weakens as the size of the cluster increases. The same scaling was observed when the coherence distribution was measured in both the usual Zeeman or z basis and the x basis. The coherence decay in the one dimensional fluoroapatite system did not change significantly as a function of the multiple quantum growth time, in contrast to the calcium fluoride case. While the growth of coherence orders is severely restricted in this case, the number of correlated spins should continue to grow, albeit more slowly. All coherence intensities were observed to decay as Gaussian functions in time. In all cases the standard deviation of the observed decay appeared to scale linearly with coherence number.Comment: 7 pages, 9 figures. submitted to PR

Restriction of stable sheaves and representations of the fundamental group

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Semistable sheaves on projective varieties and their restriction to curves

This article does not have an abstract

On semistable principal bundles over a complex projective manifold, II

Let (X, \omega) be a compact connected Kaehler manifold of complex dimension d and E_G a holomorphic principal G-bundle on X, where G is a connected reductive linear algebraic group defined over C. Let Z (G) denote the center of G. We prove that the following three statements are equivalent: (1) There is a parabolic subgroup P of G and a holomorphic reduction of the structure group of E_G to P (say, E_P) such that the bundle obtained by extending the structure group of E_P to L(P)/Z(G) (where L(P) is the Levi quotient of P) admits a flat connection; (2) The adjoint vector bundle ad(E_G) is numerically flat; (3) The principal G-bundle E_G is pseudostable, and the degree of the charateristic class c_2(ad(E_G) is zero.Comment: 15 page

Hall carrier density and magnetoresistance measurements in thin film vanadium dioxide across the metal-insulator transition

Temperature dependent magneto-transport measurements in magnetic fields of up to 12 Tesla were performed on thin film vanadium dioxide (VO2) across the metal-insulator transition (MIT). The Hall carrier density increases by 4 orders of magnitude at the MIT and accounts almost entirely for the resistance change. The Hall mobility varies little across the MIT and remains low, ~0.1cm2/V sec. Electrons are found to be the major carriers on both sides of the MIT. Small positive magnetoresistance in the semiconducting phase is measured

Search-ability A Domain Quality Factor for Web Software Applications

As organizations become aware of the strategic importance of e-commerce they will also become aware of the need of quality Web sites. In early years the World Wide Web was originally designed to present information to Web surfers using simple sites that consists of hyper linked text. But, Modern Web applications run large-scale software applications for e-commerce, information distribution, entertainment, and numerous other activities. The factors that constitute software quality in traditional data processing are well defined. However, it is necessary to have a full understanding about the quality in the context of World Wide Web. This paper identifies a new quality factor, searchability for the World Wide Web with the checklist of enablers. This factor enables the Web site developers and evaluators to create quality Web sites

Construction delays causing risks on time and cost - a critical review

There is an increase in the number of construction projects experiencing extensive delays leading to exceeding initial time and cost budget.  This paper reviews 41 studies around the world which surveyed the delay factors and classified them into Groups.  The main purpose of this paper is to review literature, each of which have categorized the causes that are responsible for time delays and cost overrun in projects. The collected list has 113 causes for delays categorized in to 18 different groups.  Most of the researches have analysed the responses from the Questionnaire survey.    The collected data are used to rank the problem.  The data are further used to investigate and analyse Important Index, Frequency Index, Severity Index, Relative Important Index, Relative Importance Weight, Weighted Average, Mean, Standard Deviation and Variance.  The collective comparison has revealed that the ranking given by all the researchers is not the same.  Further each and every study has different rank ratings for the different group of the delays.  This review paper attempts to provide an updated compilation of the earlier studies on ranking of the delay causers, which are never similar and constant for universal projects.  It is concluded that a separate study is required for identifying the factors causing delay for projects operated in Sabah, East Malaysia

Millipede Diversity and Distribution in the Sirumalai Hills (Eastern Ghats), Tamil Nadu, India

Millipedes are one of the significant terrestrial fauna in the forest ecosystem to decompose the plants' debris. Despite their environmental significance, records on millipede distribution are quite scarce and invalid in Tamil Nadu, India. The first investigation is an attempt to assess the population of millipedes at different elevation levels of Sirumallai Hills from July 2020 to June 2021. The number of millipedes was recorded using pitfall trapping and quadrant sampling. Millipede diversity and distribution in different elevations were evaluated with the help of Shannon’s and Simpson’s indexes and richness and evenness were estimated by standard methods. A total of 8 species of millipede belonging to the order Polydesmida, Sphaerotheriida and Spirobolida were recorded in lower, middle and higher elevations. Our results showed that Orthomorpha coarctata, Oxidus gracilis, Haphaphe haydeniana, Aulabolus newtoni and Trigoniulus corallinus species were in found all the elevations and most abundant in lower elevations. Arthosphaera magna, Arthosphaera dalyi and Arthosphaera distica species were abundant in middle elevations and scarce in upper and lower elevations. Diplopod species abundance and diversity were lesser in lower and higher elevations when compared to the middle elevation.  Despite their richness similarities in all elevations, there were differences in the composition of the millipede species between the elevations

Quasi-Static Brittle Fracture in Inhomogeneous Media and Iterated Conformal Maps: Modes I, II and III

The method of iterated conformal maps is developed for quasi-static fracture of brittle materials, for all modes of fracture. Previous theory, that was relevant for mode III only, is extended here to mode I and II. The latter require solution of the bi-Laplace rather than the Laplace equation. For all cases we can consider quenched randomness in the brittle material itself, as well as randomness in the succession of fracture events. While mode III calls for the advance (in time) of one analytic function, mode I and II call for the advance of two analytic functions. This fundamental difference creates different stress distribution around the cracks. As a result the geometric characteristics of the cracks differ, putting mode III in a different class compared to modes I and II.Comment: submitted to PRE For a version with qualitatively better figures see: http://www.weizmann.ac.il/chemphys/ander

Case study: Managing a case of ankylosing spondylitis for inguinal hernia repair

A 55-year-old man diagnosed with ankylosing spondylitis presented for inguinal hernia repair. The patient was found to have limited neck movement, thoracic kyphosis and restrictive lung disease. Surgery was performed under hernia block, which was inadequate. General anaesthesia was then administered and airway patency was maintained with an endotracheal tube used as a nasopharyngeal airway