Fuzzy optimization of units products in mix-product selection problem using fuzzy linear programming approach

In this paper, the modified S-curve membership function methodology is used in a real life industrial problem of mix product selection. This problem occurs in the production planning management where by a decision maker plays important role in making decision in an uncertain environment. As analysts, we try to find a good enough solution for the decision maker to make a final decision. An industrial application of fuzzy linear programming (FLP) through the S-curve membership function has been investigated using a set of real life data collected from a Chocolate Manufacturing Company. The problem of fuzzy product mix selection has been defined. The objective of this paper is to find an optimal units of products with higher level of satisfaction with vagueness as a key factor. Since there are several decisions that were to be taken, a table for optimal units of products respect to vagueness and degree of satisfaction has been defined to identify the solution with higher level of units of products and with a higher degree of satisfaction. The fuzzy outcome shows that higher units of products need not lead to higher degree of satisfaction. The findings of this work indicates that the optimal decision is depend on vagueness factor in the fuzzy system of mix product selection problem. Further more the high level of units of products obtained when the vagueness is low.     

Studies on performance of curved beam finite elements for analysis of thin arches

The finite element model with cubic polynomial shape functions to analyse thin arches has been modified to relieve membrane locking effects and thus to achieve better performance. Two different ways of improving the element stiffness have been studied, one by adopting the reduced integration technique and the other by adopting a least square fit to achieve field consistency for membrane strains. The curved cantilever beam of Kikuchi and two fixed circular arches of Dawe having different ratios of radius to thickness (one deep, the other shallow) were studied by using the improved models. The results obtained by the improved models are compared with those of others. The model with three point integration for membrane energy gives, as expected, identical results in comparison with field consistency. The model with two point reduced integration in membrane and four point integration for bending has been found to be superior in convergence.     

Synergistic anticancer effect of green synthesized nickel nanoparticles and quercetin extracted from Ocimum sanctum leaf extract

Leaf extract of medicinally important plant Ocimum sanctum(O. sanctum) has been used for the synthesis of nickel nanoparticles(Ni Gs) and extraction of quercetin(Qu). Qu has been conjugated with Ni Gs for enhanced anticancer effect on human breast cancer MCF–7 cells. Extracted Qu was conjugated with polyethylene glycol(PEG) coated Ni Gs(Qu–PEG–Ni Gs) which was used as carriers for breast cancer treatment. Anticancer activity of Qu–PEG–Ni Gs was evaluated by assessing cell viability, reactive oxygen species(ROS) production, caspase activity, mitochondrial membrane potential(MMP) and changes in nuclear morphology(staining methods). 0.85 mg of quercetin was extracted from 1 g of leaves with retention time(R_t) of 2.914 min. Loading and encapsulation efficiency of quercetin onto PEG–Ni Gs was 15.04% and 82% respectively and Qu–PEG–Ni Gs has shown a sustained release of Qu of about 84% after 48 h. Qu and Qu–PEG–Ni Gs showed dose dependent(1.56–50 μg/m L) anticancer effect against MCF–7 cells with IC50 values of 50 and 6.25 μg/m L respectively which was mediated by oxidative stress due to ROS over-production that induced loss of mitochondrial membrane potential, capsase-9,-7 activities leading to apoptosis. The present study validates that Qu–PEG–Ni Gs can be used as a potential anticancer agent for cancer therapy.     

Synthesis of tensegrity structures of desired shape using constrained minimization

There are two types of problems in tensegrity design: (i) form-finding when the tensegrity shape is not specified and (ii) synthesis when the tensegrity shape is specified. We address synthesis problems in this paper. We first formulated and solved an optimization problem to synthesize tensegrity structures of specified shape when the connectivity of the elements (bars and cables) is known a priori. We minimize the error in force-balance at the vertices in the desired equilibrium configuration by using force densities as the design variables. This constrained minimization problem enabled us to synthesize a known asymmetric tensegrity arch and a hitherto unknown tensegrity of biconcave shape similar to that of a healthy human red blood cell. We also extend the above method to a reduced order optimization problem for synthesizing complex symmetric tensegrity structures. Using this approach, we synthesized a truncated dodecahedron inside another truncated dodecahedron to emulate a nucleus inside a cell. We use a restricted global structure on an already available two-step mixed integer linear programming (MILP) topology optimization formulation to synthesize a non-convex tensegrity structure when only the coordinates are provided. We further improve this two-step MILP to a single-step MILP. We also present static analysis of a tensegrity structure by minimizing the potential energy with unilateral constraints on the lengths of the cables that cannot take compressive loads. Furthermore, we use this method to synthesize a tensegrity table of desired height and area under a predefined load. The prototypes of three synthesized tensegrities were made and validated.     

A Detailed Evolutionary Scrutiny of PEIS with GPS Fleet Tracker and AOMDV-SAPTV Based on Throughput,Delay, Accuracy,Error Rate,and Success Rate

Wireless Personal Communications - Radio Frequency Identification (RFID) technology is projected to address the issue of handling the bulk of nodes for consequently recognized and tracking tags...     

Enrichment of piezoelectric properties in Nb5+doped (0.94) (Na0.5Bi0.5)TiO3–(0.06) BaTiO3 ceramics across morphotropic phase boundary region

Lead-free piezoelectric compounds (0.94)(Na_0.5Bi_0.5)TiO₃–(0.06) BaTiO₃ [NBBT (94/06)]?+?x wt.% Nb⁵⁺ (x?=?0%, 1%, 1.5%, 2%, and 2.5%) were synthesized by the solid-state reaction route and these powders were pelletized and sintered for dielectric and piezoelectric characterization. The phase coexistence Monoclinic (Cc)?+?Rhombohedral (R3c) was affirmed using X-ray Powder diffraction analysis. The structural properties like cell parameters and space group of the synthesized ceramics were investigated by the Rietveld refinement analysis. The surface morphology and grain size of the fractured ceramics were explored using SEM imaging technique. The dielectric properties for all the ratios of NBBT (94/06) ceramics were examined using LCR meter. The piezoelectric coefficients such as d₃₃ and g₃₃ of Nb-doped NBBT (94/06) ceramics were investigated. The saturation polarization (P_s) and remanent polarization (P_r) were exhibited from the P–E hysteresis loop analysis at room temperature. The appropriate addition of Nb⁵⁺ (x?=?1.5%) in NBBT (94/06) material demonstrates eminent dielectric constant and piezoelectric coefficient d₃₃ than other wt.% of Nb. The replacement of Ti⁴⁺ with higher radius cations Nb⁵⁺ in B-site of ABO₃ composes tilting of polar BO₆ octahedra resulting in rhombohedra distortion (RD) (90° ? α), in addition, the polarizability of ions and various valance states of B-site cations could be responsible for RD (90° ? α) ensuing relatively high dielectric constant and piezoelectricity.

     

基于柔性直流输电的异步互联系统频率支援控制方法综述

利用基于电压源换流器的柔性直流输电(VSC-HVDC)的快速功率控制能力实现异步互联的交流电网间的频率支援,可以充分发挥全系统备用容量的调节能力,提高互联系统的安全性和稳定性。综述了国内外该领域的研究现状,详细介绍了基于通信的主从控制、利用电压传递频率波动的主从控制、附加频率调节的下垂控制以及基于虚拟同步机特性的控制等不同方法的基本原理。通过统一的仿真模型对比分析了各种方法的控制特点和性能,从工程应用角度总结了这些方法的优缺点以及进一步研究的方向。     

Vibration tests on a PEM fuel cell stack usable in transportation application

A fuel cell stack for use in transportation or in applications which involves the positioning of such systems in a location of high vibration and shock, is subjected to accelerated stress screening to ascertain the reliability of the stack, mechanical integrity and also to assess the mounting requirements. Such studies have not been well documented in open literature. In this paper, we have done the vibration test analysis on a 500 W Proton Electrolyte Membrane (PEM) fuel cell stack developed at our centre by simulating some of the vibration, shock and resonance in the stack and the likelihood of the stack to undergo in any application and evaluated the robustness of the stack. An experimental setup was designed for this purpose consisting of subjecting the PEM fuel cell stack to random and swept-sine excitations on a vibrating platform in three axes and measuring the mechanical response using accelerometers fixed at various locations in the stack. The fuel cell performance (pre-vibration test and post-vibration test) as obtained from polarization studies and the power–amperage curves does not show any significant damage effects, and a post-testing stack inspection showed a minor torque release. Further tests are recommended to study the dynamic life test. This study opens up further investigation which the authors propose to carry out in due course.     

Better campus life for visually impaired University students: intelligent social walking system with beacon and assistive technologies

Wireless Networks - Objective of this study is to introduce a novel, low-cost intelligent social walking path support system for visually impaired students in a wide campus area, by employing...     

Vertical and horizontal integration systems in Industry 4.0

Wireless Networks - Industrial and technological growth, sponsored by the new organizational systems generated by the fourth industrial revolution, require adapt new business management ways in the...