Precision electric characterization of LDPE specimens made by different manufacturing processes

2018 ◽  
Author(s):  
X. Xu ◽  
K. Gaska ◽  
M. Karlsson ◽  
H. Hillborg ◽  
U. W. Gedde
Keyword(s):  
Manufacturing Processes

scholarly journals Characterization of Potentized (Homeopathic, Anthroposophical and Antihomotoxic) Medicines Registered and Notified In Brazil

2021 ◽  
Vol 14 (3) ◽  
pp. 20-35
Author(s):  
Robelma Frande de Oliveira Marques ◽  
Ana Cecília Bezerra Carvalho ◽  
Marco Antonio Costa
Keyword(s):  
Oral Route ◽  
Health Surveillance ◽  
Manufacturing Processes ◽  
Active Pharmaceutical Ingredients ◽  
Regulatory Activity ◽  
Registration System ◽  
Pharmaceutical Ingredients ◽  
Industry Sector ◽  
Brazilian Legislation

Background: Potentized medicines include, according to the Brazilian legislation, homeopathic, anthroposophic, and antihomotoxic medicine and are regulated by the Brazilian Health Surveillance Agency (ANVISA). Aim: This study aims to analyze and describe a profile of potentized medicines manufactured in Brazil, either registered or notified. Methodology: Information was obtained by data analysis related to ANVISA’s electronic medicine registration system. Results: The results, obtained as of September 2012, showed that 106 potentized medicines were registered and 519 were notified. Among the registered medicines, 92.0% were combined and 100.0% of the notified were simple medicines. For registered medicines, there were equivalent manufacturing scales among them, whereas for notified medicines, there was a predominance of centesimal scales. Active pharmaceutical ingredients (API’s) of vegetal origin were the most commonly used for potentized medicine manufacturing processes; the oral route was the most common form of administration. Potentized medicines manufacturing units are more often located in southeast region of Brazil. In addition, homeopathic medicines prevail as registered or notified medicines, followed by anthroposophic medicines. Conclusions: The results of the study are expected to be useful as reference material for ANVISA to improve its regulatory activity as well the industry sector and other stakeholders.

A New Technique for Characterizing the Transient Rheological Response of Polymer Melt at High Shear Rates

2000 ◽  
Author(s):  
R. Feng ◽  
Y. Hu
Keyword(s):  
Polymer Melts ◽  
Polymer Melt ◽  
Manufacturing Processes ◽  
Shear Rates ◽  
Rheological Response ◽  
High Shear Rates ◽  
A New Technique ◽  
Polyethylene Melt ◽  
Torsion Bar

Abstract Characterization of the transient rheological response of polymer melts is important for computerized modeling and optimization of the manufacturing processes involving fast polymer melt flow such as injection molding and extrusion. In this paper, a new cone-and-plate rheometer utilizing the Kolsky torsion bar technique is reported. This rheometer can be accelerated to an angular velocity of 1600 rad/s within 100 μs. It enables characterization of the transient response of polymer melts for shear rates up to 104 1/s, temperatures up to 300°C, pressures up to 10 MPa, and shear strains up to 1000%. Experimental data are presented for a low-density polyethylene melt at shear rates between 780 1/s and 6840 1/s. The results show that the shear stress in the material increases not only with the shear rate but also more significantly with the shear strain. The significance of this finding is also discussed.

Design, Fabrication, and Characterization of Metal Embedded Microphotonic Sensors

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Xugang Zhang ◽  
Hongrui Jiang ◽  
Xiaochun Li
Keyword(s):  
Electromagnetic Interference ◽  
Manufacturing Systems ◽  
Free Spectral Range ◽  
Ring Resonators ◽  
Manufacturing Processes ◽  
Recent Developments ◽  
Fabrication And Characterization ◽  
Photonic Sensors ◽  
Manufacturing Environments

Recent developments in integrated microphotonics have led to unprecedented potential toward robust sensor enhancements for manufacturing systems. These micron-sized subwavelength structured photonic sensors could allow critical thermomechanical phenomena in manufacturing processes to be monitored while offering immunity to electromagnetic interference, resistance to hostile environments, multiplexing capabilities, and high rates of data collection. To implement these novel sensors into real manufacturing processes, the microphotonic sensors can be embedded at critical locations in metallic structures, which are heavily used in hostile manufacturing environments. This paper presents the study of design, fabrication, and characterization of integrated microring sensors. Various thin film optical materials were studied and single ring resonators were designed. A new approach to fabricate metal embedded microring sensors was developed. Metal embedded optical microring temperature sensors were characterized. The Q factor of the metal embedded microring sensors was measured to be around 2000, while the free spectral range was about 5.2nm. The temperature sensitivity of the metal embedded microring sensor was 24.2pm∕°C.

Fractal-Based Characterization of Surface Texture

1992 ◽  
Vol 35 (3) ◽  
pp. 37-44
Author(s):  
Ken Grosser ◽  
Stephen Chesters ◽  
Hwa-Chi Wang ◽  
Gerhard Kasper
Keyword(s):  
Surface Roughness ◽  
Quality Assurance ◽  
Test Data ◽  
Surface Texture ◽  
High Purity ◽  
Measurement Method ◽  
Manufacturing Processes ◽  
Surface Finishes ◽  
Gas System

The surface roughness of high purity gas system distribution materials is a matter of concern for many critical manufacturing processes. Control of this roughness is thus much in demand and requires a sensitive measurement method. A refined fractal-based characterization is presented as a possible solution. Test data that use this method to compare various surface finishes and correlate roughness with surface cleanability are offered with explanations. This could become an effective quality assurance tool in those applications where surface roughness is important.

scholarly journals Ecological Design of New Efficient Energy-Performance Construction Materials with Rigid Polyurethane Foam Waste

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1048
Author(s):  
Raúl Briones-Llorente ◽  
Ricardo Barbosa ◽  
Manuela Almeida ◽  
Eduardo Atanasio Montero García ◽  
Ángel Rodríguez Saiz
Keyword(s):  
Polyurethane Foam ◽  
Service Sector ◽  
Construction Materials ◽  
Energy Performance ◽  
Building Envelope ◽  
Environmental Benefits ◽  
Ecological Design ◽  
Manufacturing Processes ◽  
Eaf Slag

An ecological mortar is designed from industrial sub-products, with the objective of utilizing both the slag residues, generated during steel manufacturing processes, and the waste from Polyurethane Foam (PF) panels, generated during refrigerator chamber manufacturing processes. The ecological mortar design involves the dosing of Electric Arc Furnace (EAF) slag, together with finely ground Polyurethane Foam, cement, and additives. An energy efficient prefabricated block is designed with the mortar, for use in construction, and its energy performance is assessed as a material inserted within the envelope of a service sector (hospital) building, either as an exterior skin, or as an enclosing component within the façade interior. The main contribution of this research is the characterization of the thermo-physical and mechanical properties of a new prefabricated panel made with recycled materials. The full characterization of the properties of these new materials is presented and discussed. The new prefabricated panel demonstrates adequate thermo-mechanical characteristics as a substitute for traditional materials, while improving the sustainability of the building. As a secondary objective, the energy behaviour of the new panels when integrated in a real building is presented by means of a case study simulation. The use of computational thermal simulation confirmed that the properties of the prefabricated block influenced the annual thermal demand of the building for heating and cooling. Improvements to the thermal inertia of the building envelope were also confirmed with the inclusion of PF waste, giving the mortar an energy performance that was similar to conventional materials, in such a way that its use in façade construction may be validated, in addition to its environmental benefits, due to it having been manufactured with critical recycled industrial waste such as EAF slag and PF, thereby contributing to both the circular economy and sustainable development.

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