scholarly journals Continuous Improvement Process in the Development of a Low-Cost Rotational Rheometer

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 935
Author(s):  
Francisco J. Hernández-Rangel ◽  
María Z. Saavedra-Leos ◽  
Josefa Morales-Morales ◽  
Horacio Bautista-Santos ◽  
Vladimir A. Reyes-Herrera ◽  
...  
Keyword(s):  
Continuous Improvement ◽  
Quality Function Deployment ◽  
Low Cost ◽  
Rheological Characterization ◽  
Element Analysis ◽  
Effect Analysis ◽  
Rotational Rheometer ◽  
Continuous Improvement Process ◽  
Magneto Rheological

The rheological characterization of fluids using a rheometer is an essential task in food processing, materials, healthcare or even industrial engineering; in some cases, the high cost of a rheometer and the issues related to the possibility of developing both electrorheological and magnetorheological tests in the same instrument have to be overcome. With that in mind, this study designed and constructed a low-cost rotational rheometer with the capacity to adapt to electro- and magneto-rheological tests. The design team used the method of continuous improvement through Quality Function Deployment (QFD) and risk analysis tools such as Failure Mode and Effect Analysis (FMEA) and Finite Element Analysis (FEA). These analyses were prepared in order to meet the customer’s needs and engineering requirements. In addition to the above, a manufacturing control based on process sheets was used, leading to the construction of a functional rheometer with a cost of USD $1500.

Mechanical and Material Characterization of Bilayer Microcantilever-based IR detectors

2011 ◽  
Vol 1299 ◽  
Author(s):  
I-Kuan Lin ◽  
Ping Du ◽  
Yanhang Zhang ◽  
Xin Zhang
Keyword(s):  
Material Characterization ◽  
Low Cost ◽  
Isothermal Holding ◽  
Low Noise ◽  
Device Performance ◽  
Ir Detectors ◽  
Element Analysis ◽  
Noise Equivalent Temperature Difference ◽  
Ir Detection

ABSTRACTInfrared radiation (IR) detection and imaging are of great importance to a variety of military and civilian applications. Microcantilever-based IR detectors have recently gained a lot of interest because of their potential to achieve extremely low noise equivalent temperature difference (NETD) while maintaining low cost to make them affordable to more applications. However, the curvature induced by residual strain mismatch within the microcantilever severely decreases the device performance. To meet performance and reliability requirement, it is important to fully understand the deformation of IR detectors. Therefore, the purpose of this study is threefold: (1) to develop an engineering approach to flatten IR detectors, (2) to model and predict the elastic deformation of IR detectors using finite element analysis (FEA), and (3) to study the inelastic deformation during isothermal holding.

scholarly journals A Walker Designed for Parkinson’s Disease Patients Based on a Survey in Dhaka, Bangladesh

2020 ◽  
Vol 70 (2) ◽  
pp. 55-66
Author(s):  
Dibakar Sarker ◽  
Maruf Ul Karim ◽  
Md. Sharjil Ahamed ◽  
Farzana Sultana ◽  
Zahidul Islam
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Quality Function Deployment ◽  
Neurodegenerative Disorder ◽  
Low Cost ◽  
The Elderly ◽  
Public Hospitals ◽  
Element Analysis ◽  
Personal Lives ◽  
Research Activities

AbstractA neurodegenerative disorder like Parkinson’s disease (PD) causes tremor, rigidity, postural instability and gait problems in early stages and thus poses an undetermined threat to the social and personal lives of the elderly in developing countries due to insufficient survey and research activities. However, several types of assistive devices (AD) are available in the market and the real patients’ requirements are often overlooked in their design. This paper presents the process of design and fabrication of an innovative walker for PD patients. This walker has a non-modular foldable design which incentivizes patients to stand up straight and walk without the help of others. A survey on patients battling parkinsonism and practicing doctors was performed in public hospitals in Dhaka, Bangladesh and relevant engineering data was derived from it using Quality Function Deployment (QFD) which can also help visualize further market research opportunities. A finite element analysis (FEA) was performed before the walker was constructed for safety. It was handed to several volunteers for use and their responses were satisfactory. The designed walker may serve as a low-cost AD which is likely to improve a patient’s posture and overall lifestyle and therefore, it can act as a means of rehabilitation.

scholarly journals Preparation and Characterization of Sludge-Based Magnetic Biochar by Pyrolysis for Methylene Blue Removal

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2473
Author(s):  
Huiping Zeng ◽  
Wei Qi ◽  
Longxue Zhai ◽  
Fanshuo Wang ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Sewage Sludge ◽  
Low Cost ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Adsorption Experiment ◽  
Element Analysis ◽  
Magnetic Biochar ◽  
Pseudo Second Order

The development of low-cost adsorbent is an urgent need in the field of wastewater treatment. In this study, sludge-based magnetic biochar (SMB) was prepared by pyrolysis of sewage sludge and backwashing iron mud without any chemical agents. The samples were characterized by TGA, XRD, ICP, Organic element analysis, SEM, TEM, VSM and BET. Characterization analysis indicated that the magnetic substance in SMB was Fe3O4, and the saturation magnetization was 25.60 emu·g−1, after the adsorption experiment, SMB could be separated from the solution by a magnet. The batch adsorption experiment of methylene blue (MB) adsorption showed that the adsorption capacities of SMB at 298 K, 308 K and 318 K were 47.44 mg·L−1, 39.35 mg·L−1, and 25.85 mg·L−1, respectively. After one regeneration with hydrochloric acid, the maximum adsorption capacity of the product reached 296.52 mg·g−1. Besides, the adsorption kinetic described well by the pseudo-second order model revealed that the intraparticle diffusion was not just the only rate controlling step in adsorption process. This study gives a reasonable reference for the treatment of sewage sludge and backwashing iron mud. The product could be used as a low-cost adsorbent for MB removal.

Rheological characterization of tack and viscoelasticity of compositions of crepe coating used in the Yankee dryer

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 641-649
Author(s):  
JOSHUA OMAMBALA ◽  
CARL MCINTYRE
Keyword(s):  
Normal Force ◽  
Weight Ratio ◽  
Good Combination ◽  
Rheological Characterization ◽  
Nonlinear Viscoelastic ◽  
Coating Composition ◽  
Linear And Nonlinear ◽  
Work Done ◽  
Tissue Production

The vast majority of tissue production uses creping to achieve the required set of properties on the base sheet. The Yankee coating helps to develop the desired crepe that in turn determines properties such as bulk and softness. The adhesion of the sheet to the Yankee surface is a very important characteristic to consider in achieving the desired crepe. The coating mix usually consists of the adhesive, modifier, and release. A good combination of these components is essential to achieving the desired properties of the tissue or towel, which often are determined by trials on the machine that can be time consuming and lead to costly rejects. In this paper, five compositions of an industrial Yankee coating adhesive, modifier, and release were examined rheologically. The weight ratio of the adhesive was kept constant at 30% in all five compositions and the modifier and release ratios were varied. The normal force and work done by the different compositions have been shown at various temperatures simulating that of the Yankee surface, and the oscillatory test was carried out to explain the linear and nonlinear viscoelastic characteristic of the optimal coating composition.

CHEMICAL AND RHEOLOGICAL CHARACTERIZATION OF A VEGETABLE-BASED EMULSION

2019 ◽  
Author(s):  
Luiz Eduardo Rodrigues Vieira ◽  
Leonardo Rosa Ribeiro da Silva ◽  
Felipe Chagas Rodrigues de Souza ◽  
Wisley Sales ◽  
Álisson Rocha Machado
Keyword(s):  
Rheological Characterization

RHEOLOGICAL CHARACTERIZATION OF PERUVIAN COPPER ORE SLURRIES

2020 ◽  
Author(s):  
Joel López Bonilla ◽  
Cesar Celis ◽  
Danmer Maza
Keyword(s):  
Rheological Characterization ◽  
Copper Ore
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