Unsteady flow and heat transfer of tangent-hyperbolic fluid: Legendre wavelet-based analysis

The objective of the current article is to explore the unsteady flow and heat transfer of magnetohydrodynamics tangent-hyperbolic fluid flow over a stretching sheet. The governing flow model is transformed into a nonlinear set of ordinary differential equations by utilizing the appropriate similarity techniques. A new modification is introduced into the traditional Legendre wavelet method to obtain the results of the model mentioned above. The classic wavelet scheme is unable to find the solution for an infinite domain. Hence, we successfully extended it for an infinite domain and used it to attain the significant findings of the fluid problem. Additionally, the study of emerging parameters on temperature and velocity profiles is reported graphically. The velocity behavior is decreasing for the physical parameters, namely, power-lax index, unsteadiness, Hartmann number, and Weissenberg number. The temperature profile is an increasing function for power-law index and Eckert number while the behavior is the opposite for the Prandtl number. Moreover, a tabular form comparison of outcomes with existing literature, convergence, and error analysis is provided in our study, which confirms the credibility of the suggested method. The obtained results endorse the credibility and reliability of the proposed method; therefore, it could be extended for other nonlinear problems of complex nature.     

Seeding,nitrogen and irrigation management optimize rice water and nitrogen use efficiency

Nutrient Cycling in Agroecosystems - Adoption of appropriate agronomic practices, such as optimum seeding and nitrogen (N) rates, in synchronization with proper water management practice could help...     

Water sorption studies on ZnSO4-zeolite composite as potential thermochemical heat storage materials

ZnSO₄·7H₂O is modified by impregnation method with zeolite matrices (13X-zeolite and LTA-zeolite) to improve its hydration performance. Water sorption ability of composites was carried out in a constant temperature and humidity environment. Composite of ZnSO₄/13X-zeolite showed highest water sorption (0.26 g/g) at 75% relative humidity under 45°C air temperature, which is double than pure ZnSO₄·7H₂O. This is due to larger surface area (491 m² g^-1) and pore volume (0.31 cm³). Furthermore, both hydration rate and adsorption mass depends on relative humidity and hydration temperature. However, if the air temperature and the relative humidity are higher than 45°C and 75% RH, the hydration ability of the composite material is significantly reduced. Besides, X-ray measurements of composite (ZnSO₄/13X) revealed that sorption/desorption process, crystallinity and phase of partially hydrated ZnSO₄ remain the same, which enhance the adsorption mass and enthalpy during the hydration process.     

Two-dimensional median filter algorithm for parallel reconfigurablecomputers

A fast and flexible median algorithm is presented which scales well with window size. It is based on the use of image histograming. Two accumulator arrays are used to determine the median value of a discrete sequence of numbers. Speed-up factors of 3 and 4 are achieved over conventional histograming methods (those using single accumulator arrays). Two approaches have been implemented with optimisation in mind. Worst- and best case machine performance boundaries are defined. Timings are given for both types of parallel architecture     

Periodic unsteady flows of a non-Newtonian fluid

Summary Exact analytic solutions for the flow of non-Newtonian fluid generated by periodic oscillations of a rigid plate are discussed. Some interesting flows caused by certain special oscillations are also obtained.     

Thermal noise in inversion layers

Experiments on uniform channel (V_DS ≈ 0) MOSEFTs with resistance R_DS show that the thermal noise is given by the normal Nyquist formula $\text{v}{}_{\mathrm{n}}{}^2\text{= 4}\text{kT}\text{R}{}_{\mathrm{DS}}\text{Δf}$. The modification to this formula which has been proposed is thus not necessary. The discrepancies are discussed.     

An Economical Heat Treatment Cycle for IMI Ti-230

IMI Ti-230 (Ti + 2.5% Cu) is a commercial age-hardening alloy which is capable of withstanding considerable cold deformation in the solution heat treated condition. Age-hardening is associated with the coherent Ti₂Cu precipitates. IMI recommends a duplex aging treatment comprising of nucleation (first aging) at 400°C for 24 hours followed by growth (second aging) for 8 hours at 475°C.

This investigation was aimed at designing a shorter and economical heat treatment cycle for achieving properties comparable to those obtained by the standard 32 hours duplex aging treatment as recommended by IMI. In addition, the effects of cold deformation at various stages in the aging cycle on the precipitation reaction were assessed by tensile property measurements.     

Electrochemically Derived Graphene‐Like Carbon Film as a Superb Substrate for High‐Performance Aqueous Zn‐Ion Batteries

3D graphene, as a light substrate for active loadings, is essential to achieve high energy density for aqueous Zn‐ion batteries, yet traditional synthesis routes are inefficient with high energy consumption. Reported here is a simplified procedure to transform the raw graphite paper directly into the graphene‐like carbon film (GCF). The electrochemically derived GCF contains a 2D–3D hybrid network with interconnected graphene sheets, and offers a highly porous structure. To realize high energy density, the Na:MnO₂/GCF cathode and Zn/GCF anode are fabricated by electrochemical deposition. The GCF‐based Zn‐ion batteries deliver a high initial discharge capacity of 381.8 mA h g^?1 at 100 mA g^?1 and a reversible capacity of 188.0 mA h g^?1 after 1000 cycles at 1000 mA g^?1. Moreover, a recorded energy density of 511.9 Wh kg^?1 is obtained at a power density of 137 W kg^?1. The electrochemical kinetics measurement reveals the high capacitive contribution of the GCF and a co‐insertion/desertion mechanism of H⁺ and Zn²⁺ ions. First‐principles calculations are also carried out to investigate the effect of Na⁺ doping on the electrochemical performance of layered δ‐MnO₂ cathodes. The results demonstrate the attractive potential of the GCF substrate in the application of the rechargeable batteries.