Effect of Mineral Fillers on the Polyurethane Foam Performance Properties

2019 ◽  
Vol 974 ◽  
pp. 267-272
Author(s):  
Ludmila A. Suleymanova ◽  
Inna A. Pogorelova ◽  
Andrey V. Kocherzhenko ◽  
Igor S. Ryabchevsky

The authors investigated the possibility of increasing the basic operational properties of polyurethane foam by introducing such mineral fillers as clay, loam, sand, and others, including man-made ones. For the first time polyurethane foam filling with industrial waste from mining and processing plants, in particular, wet magnetic separation of ferruginous quartzites (hereinafter - tailings) was proposed. The resulting insulating composites with improved performance properties will expand the use range of the material in construction.

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1497 ◽  
Author(s):  
Isabel Santamaría Vicario ◽  
Lourdes Alameda Cuenca-Romero ◽  
Sara Gutiérrez González ◽  
Verónica Calderón Carpintero ◽  
Ángel Rodríguez Saiz

The properties and the behaviour of plaster mortars designed with Polyurethane Foam Waste (PFW) are studied in this investigation. A characterization of the mixtures is completed, in accordance with the technical specifications of European Norms. The incorporation of polyurethane waste foam can yield porous and lighter mortars, with better resistance to water-vapour permeability, although with weaker mechanical strength and higher levels of absorbency. Nevertheless, suitable mechanical strengths were achieved, resulting in a new material that is compliant with the requirements of the construction industry. The use of PFW in the the manufacture of gypsum mortars for construction reduces the consumption of natural resources and, at the same time, recovers an industrial waste that is otherwise difficult to recycle.


2016 ◽  
Vol 125 (5) ◽  
pp. 1046-1055 ◽  
Author(s):  
Huaping Sun ◽  
Yan Zhou ◽  
Deborah J. Culley ◽  
Cynthia A. Lien ◽  
Ann E. Harman ◽  
...  

Abstract Background As part of the Maintenance of Certification in Anesthesiology Program® (MOCA®), the American Board of Anesthesiology (Raleigh, North Carolina) developed the MOCA Minute program, a web-based intensive longitudinal assessment involving weekly questions with immediate feedback and links to learning resources. This observational study tested the hypothesis that individuals who participate in the MOCA Minute program perform better on the MOCA Cognitive Examination (CE) compared with those who do not participate. Methods Two separate cohorts of individuals eligible for July 2014 and January 2015 CEs were invited to participate in this pilot. The CE scores for each cohort were compared between those who did and did not participate, controlling for the factors known to affect performance. For the first cohort, examination performances for topics covered and not covered by the MOCA Minute were analyzed separately. Results Six hundred sixteen diplomates in July 2014 and 684 diplomates in January 2015 took the CE for the first time. In multiple regression analysis, those actively participating scored 9.9 points (95% CI, 0.8 to 18.9) and 9.3 points (95% CI, 2.3 to 16.3) higher when compared with those not enrolled, respectively. Compared to the group that did not enroll in MOCA Minute, those who enrolled but did not actively participate demonstrated no improvement in scores. MOCA Minute participation was associated with improvement in both questions covering topics included the MOCA Minute and questions not covering these topics. Conclusions This analysis provides evidence that voluntary active participation in a program featuring frequent knowledge assessments accompanied by targeted learning resources is associated with improved performance on a high-stakes CE.


Author(s):  
Л. Сулейманова ◽  
Lyudmila Suleymanova ◽  
А. Кочерженко ◽  
A. Kocherzhenko ◽  
И. Рябчевский ◽  
...  

Currently in Russia, great importance is attached to actual issues of energy saving and energy efficiency in construction. Valid regulations require addressing issues related to improving the energy efficiency of buildings. The development and manufacture of new types of effective thermal insulation materials is one of the ways to solve assigned tasks. The use of industrial waste from mining and processing plants as a filler for polyurethane foam is considered in this paper. Samples from the filtration field of the tailings of Stoilensky GOK from various sites are taken as the studied raw materials; their granulometric, chemical compositions and harmonic diameters of the filler particles are determined. According to the calculation results, the dependence of the foaming coefficient on the average harmonic diameter of the filler is determined. The experiment-planning matrix is developed; according to its results, mathematical models are constructed for the dependence of the foaming coefficient of laboratory samples of polyurethane foam filled with tails. Three tail zones based on the results of sampling are considered. Analyzing the obtained results, a quantitative and qualitative assessment of the influence of each factor individually and their combination on the change in the “composition - properties” system is derived.


2016 ◽  
Vol 65 (3) ◽  
pp. 287-293 ◽  
Author(s):  
Alexander E. Hristov ◽  
Nelly E. Christova ◽  
Lyudmila V. Kabaivanova ◽  
Lilyana V. Nacheva ◽  
Ivanka B. Stoineva ◽  
...  

The capability of the biosurfactant-producing strain Rhodococcus wratislawiensis BN38 to mineralize both aromatic and aliphatic xenobiotics was proved. During semicontinuous cultivation 11 g/l phenol was completely degraded within 22 cycles by Rhodococcus free cells. Immobilization in a cryogel matrix was performed for the first time to enhance the biodegradation at multiple use. A stable simultaneous hydrocarbon biodegradation was achieved until the total depletion of 20 g/l phenol and 20 g/l n-hexadecane (40 cycles). The alkanotrophic strain R. wratislawiensis BN38 preferably degraded hexadecane rather than phenol. SEM revealed well preserved cells entrapped in the heterogeneous super-macroporous structure of the cryogel which allowed unhindered mass transfer of xenobiotics. The immobilized strain can be used in real conditions for the treatment of contaminated industrial waste water.


2020 ◽  
Vol 2020 (3) ◽  
pp. 33-37

The objective of the reaserch is to elaboration the composition of a wood-polymer composition based on polyvinyl chloride with improved performance properties. The influence of the components of the composition - modifiers, lubricants, regulators and stabilizers - on the properties of the composition was researched. Optimization of the composition of wood-polymer composition based on PVC made it possible to obtain a material with higher strength and fire resistance.


Author(s):  
F. W. Wenzel ◽  
R. L. Huggart ◽  
R. W. Olsen

Most of the citrus processing plants in Florida producing frozen orange concentrate are now using various types of equipment and processes, which are usually referred to as “pulp washing”, for the water extraction of fruit solids from orange pulp. Such processes, which were added for the first time in some Florida plants during the 1957–58 citrus season, have been adopted extensively during the 1958–59 season because of two reasons, (a) the increase in yield of soluble solids from fruit made possible by the water extraction of orange pulp from juice finishers and (b) the possibility for improving the quality of frozen orange concentrate by substitution of pulp washing procedures for a double juice finishing operation. That an increase in yield results from water extraction of pulp has been definitely established, but the question concerning the effect of such a process on the quality of frozen orange concentrate is still being debated by many persons in the industry. Paper published with permission.


1994 ◽  
Vol 34 (1) ◽  
pp. 160
Author(s):  
P.J. Pike ◽  
M.G. Smith ◽  
R.S. Gill ◽  
S. Savva ◽  
A.J. Fisher

This paper describes the key initiatives Esso Australia Ltd (Esso) has undertaken to improve employee and contractor safety performance to world class standards.Esso produces 50M litres of crude oil per day and up to 25 million cubic metres of gas per day (peak winter demand) from 13 manned and three unmanned satellite platforms in Bass Strait, and two onshore oil/gas/LPG processing plants. Esso operates the facilities on behalf of the Esso/BHP Petroleum joint venture. Over 1400 employees and two million contractor work hours per year are involved in the operations.In 1992, Esso employees worked over 2.8 million hours with no Lost Time Injuries (LTI's). As of October 1, 1993, Esso employees have worked over 5.2 million hours LTI free for the first time in over 22 years of operations in Bass Strait. Employee Total Injuries (LTI's plus medical treatment injuries plus restricted work cases) are also significantly down over the period.In 1992, contractors working on Esso managed sites worked 2.2 million hours and sustained nine LTI's, for a frequency per million hours of 4.1. This was about half of the previous year's performance. Eight of these injuries occurred in the first half of 1992. Over the past 15 months, there have been two contractor LTI's equating to a LTI frequency of 0.7. Contractor Total Injuries are also significantly down over the period.In addition to occupational injury performance, the number and severity of operational incidents such as hydrocarbon releases and fires are also down.This improved safety performance and operations integrity is the culmination of a major effort to create a culture where safety is an integral part of our business and where everyone is committed to working safely.


2020 ◽  
Author(s):  
Kankan Qin ◽  
Rui F.P. Pereira ◽  
Thibaud Coradin ◽  
Verónica de Zea Bermudez ◽  
Francisco Fernandes

Silk is one of the most important materials in the history of medical practice. Owing to its excellent strength, biocompatibility and degradability, silk from Bombyx mori – which is structured as a concentric assembly of silk fibroin (SF) coated by a sheath of sericin (SS) – has long been used for wound treatment. Here, we recapitulate for the first time the topology of native silk fibers using a radically new materials design-oriented approach to achieve unprecedented porous dermal patches suitable for controlled drug delivery. The method implies four steps: (1) removing SS; (2) creating anisotropic macroporosity in SF via ice templating; (3) stabilizing the SF foam with a methanolic solution of Rifamycin (Rif) antibiotic; and (4) coating Rif-loaded redesigned SF foams with a SS sheath. The core-shell SS@SF foams exhibit water wicking properties accommodate up to ~20% lateral deformation. Moreover, monitoring of antibacterial activity against Staphylococcus aureus revealed that the SS@SF foams’ Rif release extended up to 9 days. We anticipate that reverse-engineering of silk foams opens exciting new avenues towards the fabrication of advanced drug eluting silk-based biomaterial platforms with improved performance. The present approach can be generalizable to re-build multicomponent biological materials with tunable porosity.<br>


2019 ◽  
Vol 43 (8) ◽  
pp. 917-927 ◽  
Author(s):  
Anuja Agrawal ◽  
Raminder Kaur ◽  
Ravinderjit Singh Walia

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