AB-DAM: attribute-based data access model in blockchain for healthcare applications

Multimedia Tools and Applications - This research introduces a novel attribute-based data access model in Blockchain (AB-DAM) Framework in Healthcare Systems to enhance the authentication of the...     

Deep‐Blue Phosphorescent Ir(III) Complexes with Light‐Harvesting Functional Moieties for Efficient Blue and White PhOLEDs in Solution‐Process

The photoluminescence (PL) efficiency of emitters is a key parameter to accomplish high electroluminescent performance in phosphorescent organic light‐emitting diodes (PhOLEDs). With the aim of enhancing the PL efficiency, this study designs deep‐blue emitting heteroleptic Ir(III) complexes (tBuCN‐FIrpic, tBuCN‐FIrpic‐OXD, and tBuCN‐FIrpic‐mCP) for solution‐processed PhOLEDs by covalently attaching the light‐harvesting functional moieties (mCP‐Me or OXD‐Me) to the control Ir(III) complex, tBuCN‐FIrpic. These Ir(III) complexes show similar deep‐blue emission peaks around 453, 480 nm (298 K) and 447, 477 nm (77 K) in chloroform. tBuCN‐FIrpic‐mCP demonstrates higher light‐harvesting efficiency (142%) than tBuCN‐FIrpic‐OXD (112%), relative to that of tBuCN‐FIrpic (100%), due to an efficient intramolecular energy transfer from the mCP group to the Ir(III) complex. Accordingly, the monochromatic PhOLEDs of tBuCN‐FIrpic‐mCP show higher external quantum efficiency (EQE) of 18.2% with one of the best blue coordinates (0.14, 0.18) in solution‐processing technology. Additionally, the two‐component (deep‐blue:yellow‐orange), single emitting layer, white PhOLED of tBuCN‐FIrpic‐mCP shows a maximum EQE of 20.6% and superior color quality (color rendering index (CRI) = 78, Commission Internationale de L'Eclairage (CIE) coordinates of (0.353, 0.352)) compared with the control device containing sky‐blue:yellow‐orange emitters (CRI = 60, CIE coordinates of (0.293, 0.395)) due to the good spectral coverage by the deep‐blue emitter.     

A two-level secure data hiding algorithm for video steganography

Multidimensional Systems and Signal Processing - Sensitive data is exchanged frequently through wired or wireless communication that are vulnerable to unauthorized interception. Cryptography is a...     

Transesterification of edible and non-edible oils over basic solid Mg/Zr catalysts

A series of Mg–Zr catalysts with varying Mg to Zr ratios was prepared by co-precipitation method. These catalysts were characterized by BET surface area, X-ray diffraction, X-ray photo electron spectroscopy and temperature programmed desorption of CO₂. The catalytic activity of these catalysts was evaluated for the room temperature transesterification of both edible and non-edible oils to their corresponding fatty acid methyl esters. The catalyst with Mg/Zr (2:1 wt./wt.%) exhibited exceptional activity towards transesterification reaction within short reaction time. The effects of different reaction parameters such as catalyst to oil mass ratio, reaction temperature, reaction time and methanol to oil molar ratio were studied to optimize the reaction conditions. The reasons for the observed activity of these catalysts are discussed in terms of their basicity and other physico-chemical properties.     

Conservation of closed loops

The closed loop hypothesis of Berezovsky and Trifonov implicates the closure of loops of length 25-35 through hydrophobic interactions at the 'locks' as a key event in protein folding. The hypothesis is supported by published analyses of nine major superfolds. Here, we have generated multiple sequence alignments for the nine superfolds with PDB codes lthb, 1ilb, 256b, 2rhe, 1aps, 2stv, 4fxn (2fox), lubq and 7tim and have analysed the degree of conservation at the loop ends. Seventy percent of these loop ends are found to be well conserved and the peak in the distribution of distances between these well conserved regions lies at around 25 residues; both observations are consistent with the Berezovsky and Trifonov's hypothesis.     

LOW TEMPERATURE FLOW CHARACTERISTICS OF SOME WAXY CRUDE OILS IN RELATION TO THEIR COMPOSITION : PART II EFFECT OF WAX COMPOSITION AND CONCENTRATION ON THE DEW AXED CRUDE OILS WITH / WITHOUT ADDITIVES

In this part of the work the effect of wax concentrations on the rheologica! properties of the dewaxed Duliajan (Assam) and Lingaia crude oils have been studied. The dewaxing of the crude oil was done by removing n-paraffins from the crude oil by urea adduction. The urea adducted n-paraffins concentrate-the wax- was characterized by its carbon number distribution. The urea non adducted oil portion - the denormalized crude oil (DNO)- was characterized for its pour point. The wax in different concentration was then added in the DNO and the change in the rheological properties like pour point, yield stress and plastic viscosity were studied using a Haake Rota Viscometer. The effect of carbon number distribution, i.e. the composition of the wax, on these rheological properties was also investigated. Four different commercial pour point depressanl additives have been used to study their effects on the pour point, yield stress and plastic viscosity of the reconstituted (wax mixed DNO) crude oils.

From this study it has been found that wax concentration and its composition are primarily responsible for the variation in the pour point of the DNO, and the DNO composition has a small effect. However, as seen in the Part I of this paper, the response of the pour point depressant additive in effecting the change in the pour point is primarily governed by the composition of the DNO. The additives have shown better response in the DNO having more aromatic concentrate, as has been found in the case of Duliajan (Assam) DNO.     

Development of a Multi-phase AlCuTaVW High-Entropy Alloy Using Powder Metallurgy Route and its Mechanical Properties

Transactions of the Indian Institute of Metals - Equiatomic AlCuTaVW high-entropy alloy (HEA) composition have resulted in a single-phase solid solution with a bcc crystal structure after...     

Deformation Behavior of Extra Deep Drawing Steel in Single-Point Incremental Forming

This paper focuses on investigation of formability, thickness distribution, strain distribution, and microstructural changes of extra deep drawing (EDD) steel in the single-point incremental forming (SPIF) process. For this, pyramidal frustums with varying wall angle along the depth were formed till the fracture. The parts were designed by rotating circular, elliptic, parabolic, and exponential curve segments. The varying wall angle pyramidal frustums (VWAPF) can minimize the number of experiments required to find the maximum wall angle compared to conventional constant wall angle pyramidal frustums. The maximum wall angle corresponding to fracture depth and thickness distribution along the depth was measured for parts with different generatrices. The maximum formable wall angle was found to be 73 ± 2°. Experimental thickness distribution was compared with the thickness distribution obtained from numerical simulations using the LS-DYNA software. A good correlation was found between experimental and numerical results. Furthermore, the distribution of strains obtained from numerical simulations revealed that the faces of the pyramid were under plane strain conditions, while the corners were toward biaxial stretching. The microstructural study showed that there was a grain refinement after incremental forming of the sheet.