On the Noisy Feedback Capacity of Gaussian Broadcast Channels

It is well known that, in general, feedback may enlarge the capacity region of Gaussian broadcast channels. This has been demonstrated even when the feedback is noisy (or partial-but-perfect) and only from one of the receivers. The only case known where feedback has been shown not to enlarge the capacity region is when the channel is physically degraded (El Gamal 1978, 1981). In this paper, we show that for a class of two-user Gaussian broadcast channels (not necessarily physically degraded), passively feeding back the stronger user's signal over a link corrupted by Gaussian noise does not enlarge the capacity region if the variance of feedback noise is above a certain threshold.Comment: 5 pages, 3 figures, to appear in IEEE Information Theory Workshop 2015, Jerusale

The Temperature Evolution of the Out-of-Plane Correlation Lengths of Charge-Stripe Ordered La(1.725)Sr(0.275)NiO(4)

The temperature dependence of the magnetic order of stripe-ordered La(1.725)Sr(0.275)NiO(4) is investigated by neutron diffraction. Upon cooling, the widths if the magnetic Bragg peaks are observed to broaden. The degree of broadening is found to be very different for l = odd-integer and l = even-integer magnetic peaks. We argue that the observed behaviour is a result of competition between magnetic and charge order.Comment: 3 figure

A high resolution, hard x-ray photoemission investigation of La_(2-2x)Sr_(1+2x)Mn_2O_7 (0.30<x<0.50): on microscopic phase separation and the surface electronic structure of a bilayered CMR manganite

Photoemission data taken with hard x-ray radiation on cleaved single crystals of the bilayered, colossal magnetoresistant manganite La_(2-2x)Sr_(1+2x)Mn_2O_7 (LSMO) with 0.30<x<0.50 are presented. Making use of the increased bulk-sensitivity upon hard x-ray excitation it is shown that the core level footprint of the electronic structure of the LSMO cleavage surface is identical to that of the bulk. Furthermore, by comparing the core level shift of the different elements as a function of doping level x, it is shown that microscopic phase separation is unlikely to occur for this particular manganite well above the Curie temperature.Comment: 7 pages, 5 figure

Lesions mimicking lacrimal gland pleomorphic adenoma

Aim: To report a series of patients with lacrimal gland lesions simulating the clinicoradiological features of lacrimal gland pleomorphic adenoma (LGPA). Methods: Multicentre retrospective, interventional case series. Clinical records of all patients with lesions mimicking LGPA seen in five orbital units were reviewed. Results: The study included 14 patients (seven men and seven women) with a mean age of 50.9 years. The diagnosis of LGPA was made in all cases by experienced orbital surgeons, based on clinicoradiological features, and lacrimal gland excision was performed. Postoperative histology revealed lymphoma (four patients), chronic dacryoadenitis (three patients), adenoid cystic carcinoma (two patients), Sjogren's syndrome (two patients), cavernous haemangioma (one patient), benign lymphoid hyperplasia (one patient) and granulomatous dacryoadenitis (one patient). Comparison with the total number of histologically confirmed LGPA cases seen during the study period revealed that 22.6% of cases of suspected LGPA were misdiagnosed based on clinicoradiological criteria. Conclusions: Many different lesions may mimic the clinicoradiological features of LGPA. The accepted clinicoradiological criteria used for the diagnosis of LGPA have a high false-positive rate, even in experienced hands. Based on this study, the authors believe that fine-needle aspiration biopsy or intraoperative biopsy and frozen section diagnosis may help reduce unnecessary lacrimal gland excision.Venkatesh C Prabhakaran, Paul S Cannon, Alan McNab, Garry Davis, Brett O’Donnell, Peter J Dolman, Raf Ghabrial, Dinesh Selv

Evaluate the Effect of Hot Affusion Bath with Epsom Salt on Pain Management in Osteoarthritis of Knee

INTRODUCTION: Osteoarthritis (OA) is a wear and tear type arthritis. It has two primary processes; breakdown of cartilage in joints and abnormal bony growth formation called Osteophytes. It is a chronic degenerative disease that leads to structural alteration and biochemical changes of synovial membrane and joint capsule. WHO reports worldwide osteoarthritis affects 9.6% of men and 18% of women ages above 60 years and condition will be the fourth leading cause of disability by 2020. OBJECTIVES: To assess the effectiveness of hot affusion bath with Epsom salt on knee related symptoms among patients with osteoarthritis of knee. STUDY DESIGN: Quasi experimental study. METHOD: 40 study subjects belonging within the age group of 50-65 years, participated in the study. The study participants were instructed treated with Hot affusion bath with Epsom salt, thrice a week alternatively for three weeks. Assessment with WOMAC index and goniometer taken at baseline and after three weeks. RESULT: The study showed the presence of significant reduction of knee related symptoms like pain, stiffness and improve range of motion. CONCLUSION: The study proved that Hot affusion bath with Epsom salt is found to be effective in reduction of knee related symptoms like pain, stiffness among patients with osteoarthritis of knees

Magnetic excitations in multiferroic LuMnO3 studied by inelastic neutron scattering

We present data on the magnetic and magneto-elastic coupling in the hexagonal multiferroic manganite LuMnO3 from inelastic neutron scattering, magnetization and thermal expansion measurements. We measured the magnon dispersion along the main symmetry directions and used this data to determine the principal exchange parameters from a spin-wave model. An analysis of the magnetic anisotropy in terms of the crystal field acting on the Mn is presented. We compare the results for LuMnO3 with data on other hexagonal RMnO3 compounds.Comment: 7 pages, 8 figures, typo correcte

Taxonomy and Distribution of Recent Benthic Foraminifera from the Inner Shelf of Gulf of Mannar, off Tuticorin, South East Coast of India

Foraminifera have been successful inhabitants of every aquatic environment from deep oceans to brackish water lagoons, estuaries and even rarely in fresh water streams, lakes, etc. In order to know their distribution in different offshore habitates, the present study has been undertaken 9 stations starting from Thirayshapuram to Vanthivu in two transects with necessary precautions from Gulf of Mannar, Tuticorin. Twenty five bottom sediments and water samples were collected. Benthic foraminiferal taxa belonging to four sub orders (Textularina, Milolina, Lagenina and Rotalina), 5 super families, 10 families, 11 sub families, 14 genera and 29 species have been identified. Among the 29 species, five species Ammonia beccarii, A. dentate, Spiroloculina communis, Quinquloculina seminulam and Pararotalina nipponica are considered to be abundant species of the present study. Higher diversity and population of foraminifera is noticed in the samples collected in the stations 2 to 8, because of their favorable niche. In the stations 1 and 9 the lower diversity and population may be due to the winnowing action of the waves. The substrate of present study area is seen to consist of Silty clay, Sand, Silty sand and Sand. The most accommodative substrate for higher population is Silty sand. The main ecological parameters, which govern the distribution of foraminifera of the present study area, are organic matter content and nature of the substrate. The other water parameters like temperature, salinity, pH and dissolved oxygen do not show any appreciable spatial variation among different stations and hence they do not have any ecological significance in the distribution of foraminifera. Keywords: Benthic foraminifera, Gulf of Mannar, South East coast of India

Cephalopod resources revealed by exploratory surveys in Indian seas

The areawise and depth wise cephalopod catches of fishing vessels of Government of India and some Agencies which conducted exploratory fishing in offshore areas have been presented and discussed. The exploratory fishing by Government of India vessels in Bombay-Gujarat region during 1977-80 yielded a maximum of 7,609 kg of cephalopods a year at a catch rate of 6.8 kg/h. The highest catch rates were recorded from the area 19-70 and the depth zone 80-89 m. In Visakhapatnam region the cephalopod catch was poor during 1968-75 but during 1977-80 the annual catch increased to 3,283 kg. The most intensively fished area was 17-83. The catch was composed of four species of cuttlefishes and three species of squids. The results of trawl surveys in other parts of Indian waters are also dealt with