Effect of deposition orientations on dimensional and mechanical properties of the thin-walled structure fabricated by tungsten inert gas (TIG) welding-based additive manufacturing process

Welding-based additive manufacturing can potentially produce a cost-effective process for the production of dense metallic parts. Tungsten inert gas (TIG) welding-based additive manufacturing process uses wire as a filler material and offers a high deposition rate with low spattering. In this study, different orientations of wire feeding nozzle and TIG welding torch, such as front wire feeding (FWF), back wire feeding (BWF), and side wire feeding (SWF), were investigated for thin-walled metal deposition with enhanced dimensional accuracy and mechanical properties. The dimensional accuracy of thin-walls deposited at four different orientations were investigated in terms of deposition height and deposition width. The FWF orientation with higher wire feeding angle and SWF orientation produced poor dimensional accuracy in the deposition. FWF orientation with normal wire feeding angle and BWF orientation provided a decent dimensional accuracy and surface appearance. The deposited samples exhibited a similar trend for Vickers microhardness, residual stress, and microstructure for the four different wire feeding orientations.     

Strong magnetoelectric effect in pulse laser deposited [Ba(Zr0.2Ti0.8)O3‐0.5(Ba0.7Ca0.3)TiO3]/CoFe2O4 bilayer thin film

Polycrystalline bilayer thin film of multiferroic [Ba(Zr_0.2Ti_0.8)O₃‐0.5(Ba_0.7Ca_0.3)TiO₃]/CoFe₂O₄([BZT‐0.5BCT]/CFO) has been deposited on Pt/Si (100) substrate using a pulsed laser deposition technique. The dielectric analysis reveals a significant change in the dielectric constant (~39% at a typical frequency of 100 Hz) at room temperature when a magnetic field is applied, in addition to a substantial improvement in the saturation polarization. A low leakage current density (~ 5 × 10^?7 A/cm²) and a high magnetoelectric coupling coefficient (α_E) both in the transverse (~2.085 V/Oe cm) as well as in the longitudinal (~0.708 V/cm Oe) directions, indicate in‐principle usability of this system for multifunctional device applications in thin film form.     

Integration of recurrent convolutional neural network and optimal encryption scheme for intrusion detection with secure data storage in the cloud

Data communication security is growing day after day with the proliferation of cloud computing. It is primarily because of the few security constraints and challenges occurring in the cloud environment during data transmission. Existing research has shown that the intrusion detection system (IDS) centered on the cloud is more complicated. In this article, we address the above issues by proposing an attention‐based recurrent convolutional neural network (RCNN). This proposed RCNN is used to detect whether the text data are intrusion or nonintrusion. The nonintrusion text information is then used for further processing and encrypted using a two‐way encryption scheme. We introduce the elliptical curve cryptography (ECC) approach to increase the security‐level performance of nonintrusion data. Moreover, the integration of ECC with the modified flower pollination algorithm (MFP‐ECC) creates the two‐way encryption scheme, and it is used to produce an optimal private key. The encrypted data are then stored in a cloud environment by steganography and the data with the sensitive information are replaced by some other text, thus providing security to the data at rest. The proposed MFP‐ECC approach shows maximum breaking time results and can also withstand different classical attacks when compared with other methods. As a result, the proposed intrusion detection and secure data storage mechanism is highly secured and it is never affected by any kinds of conspiracy attacks.     

Multipurpose medical image watermarking for effective security solutions

Multimedia Tools and Applications - Digital medical images contain important information regarding patient’s health and very useful for diagnosis. Even a small change in medical images...     

Flexible electroactive PVDF/ZnO nanocomposite with high output power and current density

In the present study, a lightweight and flexible polyvinylidene fluoride (PVDF)/zinc oxide (ZnO) nanocomposite was prepared using a low-temperature phase-inversion process. The synergetic effect of low-temperature, phase-inversion, and the integration of ZnO nanoparticles primes on enhancing the electroactive polar β-phase in the nanocomposite. The transformation of the electroactive phase and its quantification were carried out using Fourier-transform infrared spectroscopy and wide-angle X-ray diffraction. The PVDF/ZnO piezoelectric polymer nanocomposite was utilized for energy harvesting application that showed a better electromechanical response of ca. 69 V (peak to peak) at ~1.6 N, 250 μW/cm² surface power density and 0.25 mA/cm² surface current density. The fabricated piezoelectric polymer nanocomposite is a possible candidate for superior energy scavenging applications for capturing human kinematics.     

Computer-aided diagnosis of breast cancer using bi-dimensional empirical mode decomposition

Neural Computing and Applications - Breast cancer is a serious disease for women in the world and ranks the second cancer for women in many countries. Computer-aided diagnosis provides a second...     

Sponge EPDM by design

ABSTRACT

The majority of EPDM materials are produced by traditional Ziegler–Natta/Vanadium catalyst and process technology. In recent decades, EPDM metallocene catalyst technologies have increased the efficiency of production and quality of materials. For the next generation, Dow introduces its Advanced Molecular Catalyst technology that further expands the molecular capability to produce new EPDMs for production of automotive sponge weather-strip (WS). These new EPDMs provide homogeneous mixing during production, faster curing and foaming during processing, and finally, an excellent surface to the EPDM automotive WS. The design and microstructure of these EPDMs are tailored to impart superior collapse resistance to the extruded profile that results in the successful production of complex WS. Case studies are also shown that demonstrates the advantages that the new EPDM brings to the automotive profile producers.     

Effect of electromagnetic field on the thermal performance of longitudinal trapezoidal porous fin using DTM–Pade approximant

The heat transfer and thermal distribution through porous fins have gotten a lot of attention in recent years due to their extensive applications in the manufacturing and engineering field. In porous fins, the impact of magnetic field aids in improved heat transfer enhancement. Also, the combination of an electric effect and a magnetic field considerably enhances heat transfer. In this direction, the thermal distribution through a convective–radiative longitudinal trapezoidal porous fin with the impact of an internal heat source and an electromagnetic field is discussed in the present analysis. The governing heat equation is nondimensionalized with nondimensional terms, and the transformed nonlinear ordinary differential equation is solved analytically using the DTM–Pade approximant algorithm. Furthermore, the graphical discussion is presented to explore the impact of various nondimensional parameters, such as convection-conduction parameter, fin taper ratio, thermomagnetic field, radiation–conduction parameter, internal heat generation parameter, and thermoelectrical field on the temperature gradient of the fin. The investigation's key findings disclose that as the magnitude of the convection–conduction parameter, fin taper ratio, and radiation–conduction parameter increase, the thermal distribution through the fin reduces. The thermal distribution inside the fin increases for the heat-generating parameter, thermoelectric, and thermomagnetic fields.     

Thermal characteristics of hydrated salt blended with Tio2 for thermal energy storage

Development leads to an increment in the demand for energy. Conventional sources of energy are fulfilling our energy demands but they are crossing environmental barriers resulting in adverse climatic change. Renewable source of energy is becoming popular as a solution to the energy crisis. To reduce the gap between energy demand and supply, energy storage methods should be developed more. In this paper, performance improvement of phase change material for energy storage purposes has been investigated. NaNO₃/KNO_3, which is a salt hydrate, is used as a phase change material. The weight proportion of NaNO₃ and KNO₃ is 55% and 45%, respectively. TiO₂ is used as an additive for performance improvement of phase change material in nanoparticle form with different particle sizes of 10, 20, and 30 nm. All the abovementioned nanoparticles were blended with phase change material (PCM) to make three different samples for testing. The weight percentage of TiO₂ is constant in every sample, which is 5%. Specific heat, thermal conductivity, charging, and discharging of PCM have been measured for different particle sizes along with the effects of temperature variation on the abovementioned properties. Specific heat has shown an increment by 16%, 20.5%, and 23.6%, and thermal conductivity has shown a decrement by 13%, 16.5%, and 21.5% for 10, 20, and 30 nm particle sizes, respectively. Blending with TiO₂ has increased the rate of heating and decreased the rate of cooling of phase change material.