A thorough investigation for development of hydrogen projects from wind energy: A case study

Increasing energy demand has led to a substantial growth in the use of wind energy across the world, which can be attributed to the low initial and running costs and rapid and easy deployment of this technology. The development of hydrogen from wind energy is an excellent way to store the excess wind power produced, as the produced hydrogen can be used not only as clean fuel but also as input for various industries. Considering the good wind potentials of Yazd province, the variety of industries that are active in this area, and the central location of this province in Iran, which gives it ample access to major transport routes and other industrial hubs, hydrogen production from wind power in this province could benefit not only this region but the entire country. Given these considerations, we conducted a technical, economic, and environmental assessment of the potential for wind power generation and hydrogen production in Yazd province. Overall, the assessments showed that the best locations for harvesting wind energy in this province are Bahabad and Halvan stations. For these two stations, it is recommended to use EWT DW 52-900 turbine to take advantage of its higher nominal capacity to achieve higher electricity and hydrogen output and emission reduction. For Abarkoh and Kerit stations, which have a low wind energy potential, it is recommended to use small turbines such as Eovent EVA120 H-Darrieus. Also, economic and technical assessments showed that it is not economically justified to harvest wind energy in Ardakan station. The results of ranking the stations with the Step-wise Weight Assessment Ratio Analysis (SWARA) and Evaluation based on Distance from Average Solution (EDAS) techniques showed that Bahabad station was introduced as the best place to produce hydrogen from wind energy.     

Take care of your belongings today – securing accessibility to complex electronic business processes

Most of today’s business processes are based solely on digital data. Input, output, and intermediate results are pure digital objects. Keeping such data accessible and meaningful but even more importantly keeping the business processes functional is challenging. With regards to complex electronic business processes traditional archiving does not provide satisfactory results. Due to the fast technical life-cycle the time gap between archiving and re-enactment or reuse of a process poses risks and increases the uncertainty on achievable results. We propose a novel strategy bridging this specific time gap. For this we present a scalable and cost-effective infrastructure with associated workflows focusing on a process’ execution context. Most importantly the process’ developers are able to assess the preserved results in a timely manner, and thus, reduce the uncertainty on future re-enactment results.     

Numerical Study of Dam Break Waves on Movable Beds for Complex Terrain by Volume of Fluid Method

Water Resources Management - In this study, a method based on the Navier-Stokes equation was developed to simulate the dam break flow. The free surface movement of water is carried out using the...     

Some features of thermophysical properties of γ‐Gd2S3 ceramics based on real structure

The heat capacity C_p, thermal diffusivity χ_T, and lattice thermal conductivity κ_latt of ceramic solid solutions of sesquisulfides Gd_3‐xV_Gd,xS₄ (0 < x < 0.33) in the temperature range 300‐700 K has been studied. Changing the real structure, namely the concentrations of vacancies (N_V) and deformation (N_Dc) centers of polycrystals, significantly decreases κ_latt. A deviation of composition from the stoichiometry 2:3 is accompanied by an increase in the specific area of the crystallite boundaries per unit volume, and, hence, the concentration of deformation centers D_C increases. This observation was confirmed by examining the short‐range order disturbance of the lattice and symmetry environment of the Gd³⁺ and S^2? environment by Raman spectroscopy and the magnetic susceptibility Faraday method. Therefore the thermal diffusivity of gadolinium sesquisulfide is reduced because of the mean free path of phonons decrease. As a result, the thermal conductivity of the polycrystalline samples is reduced by 10%.     

Dam-Break Flow on Mobile Bed Through an Idealized City: Numerical Study

Water Resources Management - This paper presents a numerical simulation of a three-phase flow (water, air, and mud) formed during a dam break. For the connection between all phases, the...     

Figure of merit enhancement in thermoelectric materials based on γ-Ln0.8Yb0.2S1.5-y (Ln = Gd,Dy) solid solutions

Here we report the study temperature dependencies of the Seebeck coefficient, the electrical resistivity (T = 300–750 K), the total thermal conductivity (T = 300–973 K), and the thermoelectric figure of merit (T = 300–750 K) of ceramic samples of γ-Ln_0.8Yb_0.2S_1.5-y (Ln = Gd, Dy) solid solutions. It was found that Yb³⁺ ions in γ-Ln_0.8Yb_0.2S_1.5-y act as the promoters of higher crystallite nucleation rate during the formation of solid solutions. This results in the sample dispersion increase and the formation of the additional phonon scattering centers (dislocations and strain stresses along the crystallites semi-coherent boundaries). These features of the real structure determined the low value of thermal conductivity of γ-Ln_0.8Yb_0.2S_1.5-y solid solutions. The lowest electrical resistivity 20 μΩ m at 750 K and the thermal conductivity 0.58 W/m K at 973 K, the highest Seebeck coefficient 125 μV/K at 700 K and the maximum thermoelectric efficiency, ZT = 0.60 (at 770 K) were obtained for γ-Dy_0.8Yb_0.2S_1.5-y.     

Improving the Accuracy of Network Intrusion Detection System in Medical IoT Systems through Butterfly Optimization Algorithm

Wireless Personal Communications - Network intrusion detection systems analyze traffic in a medical IoT system to detect abnormal behaviors. Machine learning and artificial intelligence (AI)...     

Numerical Study of the Water Surface Movement During a Dam Break on a Slope with Cascade Dike from Sediment

Water Resources Management - A dam break in a real area with underlying cascading reservoirs is an extremely dangerous disaster. In this work, a numerical simulation of the flow during the dam...     

富铁镍渣综合利用的研究与进展综述

富铁镍渣(含铁约40%)难以被直接提取利用,只能进行堆置处理,在造成资源浪费的同时还占用了大量的场地。介绍了近年来对于镍渣的综合利用研究与进展,包括还原提铁、提取镍钴铜、冶炼钢铁合金、制作微晶玻璃、用于建筑领域以及矿山填埋,并归纳总结了这些利用方法的不足之处,最后对镍渣综合利用的发展要求进行了展望。