Systematic study of heavy cluster emission from {210-226}^Ra isotopes

The half lives for various clusters lying in the cold reaction valleys of {210-226}^Ra isotopes are computed using our Coulomb and proximity potential model (CPPM). The computed half lives of 4^He and 14^C clusters from {210-226}^Ra isotopes are in good agreement with experimental data. Half lives are also computed using the Universal formula for cluster decay (UNIV) of Poenaru et al., and are found to be in agreement with CPPM values. Our study reveals the role of doubly magic 208^Pb daughter in cluster decay process. Geiger - Nuttall plots for all clusters up to 62^Fe are studied and are found to be linear with different slopes and intercepts. {12,14}^C emission from 220^Ra; 14^C emission from {222,224}^Ra; 14^C and 20^O emission from 226^Ra are found to be most favourable for measurement and this observation will serve as a guide to the future experiments.Comment: 22 pages, 6 figures; Nuclear Physics A (2012

Significance of Boron Nitride in Composites and Its Applications

Boron nitride (BN) exists in several polymorphic forms such as a-BN, h-BN, t-BN, r-BN, m-BN, o-BN, w-BN, and c-BN phases. Among them, c-BN and h-BN are the most common ceramic powders used in composites to ensure enhanced material properties. Cubic boron nitride (c-BN) has exceptional properties such as hardness, strength than relating with other ceramics so that are most commonly used as abrasives and in cutting tool applications. c-BN possesses the second highest thermal conductivity after diamond and relatively low dielectric constant. Hence pioneer preliminary research in AMCs proven substitute composites than virgin AA 6061 traditionally used for fins in heat sinks. Moreover, poly-crystalline c-BN (PCBN) tools are most suitable for various machining tasks due to their unmatchable mechanical properties. h-BN also finds its own unique applications where polymer composites for high temperature applications and sp3 bonding in extreme temperature and compression conditions

DESIGN AND IMPLEMENTATION OF IMAGE FUSION ALGORITHM USING DCT AND LAPLACIAN PYRAMID APPROACH

In this paper introduces a approach to implement image fusion algorithm i.e. LAPLACIAN PYRAMID based on (discrete cosine transform) DCT. This proposed technique implements a pattern selective approach to image fusion. The basic idea is to perform pyramid decomposition on each source image. It is concluded that fusion with higher level of pyramid provides better fusion quality. The execution time is proportional to the number of pyramid levels used in the fusion process. The performance of this technique is measured by root mean square error, peak signal to noise ratio, mea absolute error and signal to noise ratio. From the performance analysis it has been observed that PSNR and SNR is increased, where as RMSE and MAE is decreased in this technique. The aim of image fusion, apart from reducing the amount of data, is to create new images that are more suitable for human/machine vision. The proposed algorithm is very simple, easy to implement and could be used for real time applications such as military, remote sensing and medical imaging

Вплив об’ємної концентрації алюмосилікатних волокон на гнучкість гібридних алюмополімерних композитів

Композити з різною структурою алюмосилікатних волокон були виготовлені і випробувані для отримання оптимальної гібридної структури. Алюмополімерний композит є унікальним матеріалом, який останнім часом має широку сферу використання в інженерії, оборонному комплексі, транспортних засобах, аерокосмічній і морській галузях. Гібридні композити GLARE виробляються із додаванням надтонкого поверхнево обробленого шару алюмінію на поверхні однонаправлених тканин E-Glass із включеннями епоксидного полімеру. Спочатку було виготовлено декілька матеріалів GLARE з різним фракційним складом. У результаті досліджувалась поведінка матеріалу при згинанні для виявлення усіх параметрів гнучкості. Виявлено надвеликий коефіцієнт ударного опору такого гібридного матеріалу. Результати показали, що збільшення концентрації металу значно збільшує здатність поглинання енергії на композит, а також підтвердили незначну зміну модуля пружності першого роду. Наостанок, зруйновані поверхні були досліджені із застосуванням оптичного мікроскопу.Composites with different configuration of fiber (E-Glass) and metal (Aluminium) laminates were fabricated and tested for grasping optimum hybrid structure. GLARE (Glass laminate aluminium reinforced epoxy) is a unique composite recently being used by wide engineering domains like defense body and vehicle armors, aerospace, marine and structural applications. The GLARE hybrid composites are manufactured by adding very thin layer of aluminium sheets (surface treated) on the surface of unidirectional E-Glass fiber fabrics in presence of epoxy polymer. Firstly three hybrid GLARE laminates were fabricated with different volume fractions. Consequently, impact and flexural behaviors are measured by izod, charpy impact and flexural tests for all volume configurations. Impact resistance of such hybrid laminate is intensively great. The results depicts that the linear metal volume fraction (MVF) increment on fiber metal laminates greatly increases impact energy absorption capacity of composites and little difference in flexural modulus. Finally the fractured surfaces were analyzed by optical microscope

Конструкція та аналіз вузлів з'єднувальних тяг для застосування в автомобілебудуванні

The tie rod end is one of the most elementary parts of a steering mechanism, which has direct and crucial importance in terms of driving safety. The tie rod end is used to ensure that the wheels are aligned. It provides the adjustment for the wheel to align and keeps the tires free from wearing out on the inner as well as outer edges. Hence the functioning of the tie rod is crucial for steering as well as suspension performance of the vehicle. Today’s world is competitive. Market demands the advanced technology at a lower price. This reflects in making the technology cheaper. Hence every industry determined for the cost-effective product at a lower price and within minimum period for ‘time to market. This puts a lot of pressure on engineers to consistently strive to design the more effective products at the lower price. The work is focused on the functioning of the tie rod. Generally, tractor connecting tie rod gets failed due to the overload applications. This paper focuses on modifying the old tie rod design and material. Finally, analysis the load causes of existing and modified design using ANSYS software. This modelling approach, the stress variations and deformation characteristics of each component are investigated for high operational loading conditions.Кінцева тяга є однією з найпростіших частин рульового механізму, що має безпосереднє і найважливіше значення з точки зору безпеки руху. Кінцевий штифт використовується для того, щоб колеса були вирівняні. Ця стаття зосереджена на модифікацію традиційної конструкції тяги. Наведено аналіз причин завантаження існуючої та модифікованої конструкцій за допомогою програмного забезпечення ANSYS. Цей підхід грунтується на дослідженні навантажень і деформацій кожного компонента для високих експлуатаційних умов навантаження

Tuberculous uveitis presenting as pigmented hypopyon – A case report

Purpose: Hypopyon in the eye is an alarming sign. A case of tuberculous uveitis which presented with pigmented hypopyon has been described. The aim of this paper is to report pigmented hypopyon, a rare presentation of tuberculous uveitis in a diabetic patient. Observations: A 42-year-old patient with diabetes with a known history of miliary tuberculosis, on anti-tubercular therapy since two months presented with complaints of pain and redness followed by diminution of vision in the right eye since one month. Visual acuity was counting fingers close to face in right eye. Anterior chamber (AC) showed grade 4 cells and flare with a pigmented hypopyon measuring two mm. Fundus details were not made out. B scan revealed increased choroidal thickness with moderate vitritis. Routine blood counts revealed leucopenia and anemia suggestive of an immunosuppressed state. AC tap analysis was not helpful in diagnosis initially. Patient was lost to follow up and presented one month later with three - fourth of AC having hypopyon. AC wash was done and the AC sample evaluation revealed acid fast bacilli. Polymerase chain reaction results confirmed it to be Mycobacterium tuberculosis. Conclusions and importance: Tuberculous anterior uveitis thus presenting as pigmented hypopyon is very rare and can cause diagnostic difficulties. High index of suspicion in tuberculosis endemic areas is a must for a prompt diagnosis. A possible association between immunosuppression and pigmented hypopyon may exist and needs to be studied further