Charmed baryons from LHCb

The vast amount of $c\overline{c}$ production that can be recorded by the LHCb detector makes it an ideal environment to study the hadronic production of charmed baryons, along with the properties of their decays. We briefly describe the LHCb experiment and the triggering mechanisms it uses for recording charm production. Previous charmed baryon results from LHCb are detailed, with a description of the future plans for the charmed baryon programme.Comment: 12 pages, 6 figures. To be published in the proceedings of CHARM-2015, Detroit, MI, 18-22 May 201

Studies of charmed baryons at LHCb

We report a search for the doubly charmed baryon $\Xi_{cc}^{+}$ through the decay $\Xi_{cc}^{+} \to \Lambda_{c}^{+} K^{-} \pi^{+}$, using a data sample corresponding to an integrated luminosity of $0.65~\mathrm{pb^{-1}}$ of $pp$ collisions at $\mathrm{\sqrt{s}} = 7~\mathrm{TeV}$. In the mass range 3300-3800$~\mathrm{MeV}/c^{2}$ no significant signal is observed. Upper limits at $95\%$ confidence level are set on $R$, the ratio of the production cross section of the $\Xi_{cc}^{+}$ times the relevant branching fraction over the $\Lambda_{c}^{+}$ cross section, as a function of the $\Xi_{cc}^{+}$ mass and lifetime. The largest upper limits on $R$ over the investigated mass range are $R<1.5\times10^{-2}$ for a lifetime of $100~\mathrm{fs}$ and $R<3.9\times10^{-4}$ for a lifetime of $400~\mathrm{fs}$.Comment: Article to appear in the proceedings of The 6th International Workshop on Charm Physics (CHARM 2013

Geophysical and geochemical investigations over the Long Rake, Haddon Fields, Derbyshire

Geophysical and geochemical investigations were undertaken over the Long Rake at Haddon Fields, Derbyshire in order to establish methods, or combinations of methods, showing the best response to the mineralisation. The mineralised structure carries high concentrations of fluorite with associated lead and zinc minerals and the gangue minerals baryte and calcite. The ground examined was relatively undisturbed with good geological control from drill hole data. Gravity and magnetic anomalies such as those obtained over the Long Rake could have limited applications for the indirect location of veins the approximate position of which is known. Induced polarisation, resistivity and electro-magnetic measurements failed to produce anomalies which could be directly attributed to the mineralisation or its host structure. However, reconnaissance mapping with very low frequency electro-magnetic (VLF-EM) and Radiohm methods showed that, over a large section of the survey area, the fluorspar vein could be mapped by its association with the subdrift shale/limestone contact. The determination of a wide range of elements in soils and tills showed that the more mobile elements such as F and Zn are particularly useful in detecting mineralisation over broad areas. Less mobile elements tend to exhibit localised disperson patterns which have applications in precisely locating an orebody. Elements enriched in soil above the Long Rake, in areas of thin overburden, include Pb, Ba, Sr, Ca, Zn, Rb and Th. Thickening cover towards the west tends to mask anomalies of many elements above the Rake, only Ba, Sr and Pb maintaining significant contrast. The collection of basal till samples was made difficult by the occurrence of large limestone boulders. However, results indicated that the method has no advantage over soil geochemistry in this environment, as geochemical contrast is not improved. Levels of Ba and Ca were highly variable and the concentration of Ba appeared to be directly related to the sampling depth

Array optimisation for multichannel electrical resistivity tomography instruments

In recent years there has been considerable research into the selection of near-optimal arrays of electrode configurations that enhance the resolution of electrical resistivity tomography (ERT) images. Several algorithms have been developed that select resistivity measurements based on their contribution to the cumulative sensitivity of the array (Furman et al., 2004; Hennig and Weller, 2005) or its model resolution matrix (Stummer et al. , 2004; Wilkinson et al., 2006a; 2006b). Homogeneous subsurface resistivity distributions were assumed for these studies, although better results can be obtained using the same algorithms if the resistivity distribution is known a priori (Anthansiou, 2006). When compared to standard arrays, such as dipole-dipole or Wenner- Schlumberger, optimised arrays can substantially improve the resolution of the ERT image for the same number of measurements (Wilkinson et al., 2006b). The driver for researching array optimisation techniques has been the development of computer controlled ERT systems that can address arbitrary combinations of current and potential electrodes. Unfortunately all the published optimisation algorithms share a problem that is likely to impede their wider use: the arrays that they produce are inherently ‘single channel’ (SC). Since they do not take advantage of the multichannel (MC) capability of modern ERT instruments, the optimised arrays that they produce are rather inefficient to use compared to many standard arrays that are well suited to MC operation. However, we have developed a simple extension that constrains our previous algorithm to choose near-optimal configurations that also fit well into a MC measurement scheme. This extension could easily be adapted to work with the other optimisation schemes cited above

UT with SH-Waves and Electromagnetic Ultrasonic (EMUS) -Transducers

In the ultrasonic testing practice of today SV- and longitudinal waves are exclusively used because these wave types can be excited by piezoelectric ultrasonic transducers introduced a long time ago

Vinyl chloride precipitation polymerisation charge effects

SIGLEAvailable from British Library Document Supply Centre- DSC:D67679/86 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

PEMAKNAAN KARIKATUR “AHMADIYAH TANPA NEGARA” pada Cover Majalah Tempo edisi 14-20 Februari 2011 (Studi Semiotik Terhadap Pemaknaan Karikatur “AHMADIYAH TANPA NEGARA” pada Cover Majalah Tempo edisi 14-20 Februari 2011)

Tujuan dari penelitian ini adalah untuk mengetahui makna karikatur “Ahmadiyah Tanpa Negara” pada cover majalah Tempo edisi 14-20 Februari 2011. Teori yang digunakan adalah semiotik Charles Sanders Pierce yang membagi antara tanda dan acuannya menjadi tiga kategori yaitu : ikon, indeks dan simbol adalah tanda yang hubungan antara penanda dan penandanya bersifat bersamaan bentuk alamiah. Metode penelitian yang digunakan adalah metode Deskriptif Kualitatif. Pada karikatur “Ahmadiyah Tanpa Negara” ini menunjukan karikatur wayang kulit yang bergambarkan empat orang laki-laki di dalamnya. Wayang kulit tersebut merepresentasikan bingkai dari peristiwa penyerangan terhadap jemaat Ahmadiyah di Cikeusik, Banten, Februari 2011 ini. Penyerangan ini mengakibatkan jatuhnya korban jiwa. Gambar keempat pria dalam gambar wayang mewakili ribuan penyerang anti Ahmadiyah dari organisasi Islam lain. Dalam karikatur ini, digambarkan tangan berbalut jas hitam yang memegang karikatur wayang kulit. Tangan ini adalah tangan presiden, sebagai pejabat tertinggi negara yang mempunyai otoritas mewakili pemerintahannya mengambil sikap politik untuk masalah penyerangan ini. Dalam peristiwa ini, hak asasi pengikut Ahmadiyah untuk bebas berkeyakinan direnggut, bahkan nyawa mereka terancam. Oleh karena itu negara harus mengambil sikap yang jelas terhadap kasus-kasus seperti kasus Ahmadiyah ini. Pemerintah hendaknya tetap melindungi rakyatnya dan mewujudkan kebebasan berkeyakinan sesuai dengan yang tercantum dalam konstitusi negara Indonesia, UUD 1945

William Pincus: A Life in Service – Government, Philanthropy and Legal Education

This article memorializes the life and accomplishments of William “Bill” Pincus. The article brings the reader through Mr. Pincus’s career accomplishments, from his humble beginnings in New York City, to his impressive career in civil service, culminating in his work with the Ford Foundation and the Council on Legal Education for Professional Responsibility (CLEPR), where he spearheaded reforms in legal education. Mr. Pincus’s efforts were critical in establishing clinical legal education, drawing from his experiences both in law and government. Much of this article is derived from interviews of Mr. Pincus, conducted by the author, and provides an unprecedented insight into the life of a devoted and influential promoter of clinical legal education