57 research outputs found
Effect of compatibilizer and nanosilica on the mechanical, thermal, and degradation kinetic properties of polypropylene/polylactic acid blends
In this study, polypropylene (PP) was blended with polylactic acid (PLA) to enhance PP's mechanical properties, such as tensile strength and modulus, and to encourage the adoption of eco-friendly, renewable resource based material in polymer production. Even though PLA's biodegradability cannot be fully utilized in PP/PLA blends, but PLA can still improve PP's mechanical properties and provide an alternative resource for biobased raw materials. To meet the requirement, PP and PLA were blended in a 70:30 ratios with a compatibilizer and nanosilica at different loading levels by melt-blending. Blends of PP and PLA materials were processed without any problems, since both materials have melting points in the range of 170°C. Despite this, the properties of polymer blends are limited by the immiscibility between these neat polymers. To solve this problem, compatibilizers like polypropylene-grafted-maleic anhydride (PP-g-MA) were added to blends to improve their compatibility. Nanosilica was also added to this compatibilizer to study the system's compatibility and modify the hydrophobicity of PLA. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), tensile strength, and field emission scanning electron microscopy (FESEM) were used to analyze the polymer blend. Results indicate that compatibilizers play a significant role in improving tensile properties, thermal stability, and blend dispersion in the system, mainly in 5 parts compatibilizer-based systems. Composition with 5 parts compatibilizer increases tensile strength of 70/30 blend from 19.7 to 27 MPa, while elongation increases from 2.2 to 3.6 %. Additionally, a composition with 0.7 parts of nanosilica increases the modulus from 1488 to 1732 MPa when compared to the 70/30 blend
Acute-on-chronic liver failure: consensus recommendations of the Asian Pacific Association for the Study of the Liver (APASL) 2014
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Utilizations and Outcomes of the Otolaryngology and Audiology clinic at the UCSD Student-run Free Clinic Project
The UCSD SRFCP provides healthcare to an underserved population of San Diego that otherwise does not qualify for access to care3. While the clinic mainly provides primary care, there are also a number of specialty clinics available, including otolaryngology. The otolaryngology clinic began in January 2010, with the addition of audiology in early 2011. The clinic began with 1 volunteer attending and 1 audiologist who saw 2‐3 patients every 2 months. Currently, there are 2 volunteer attendings who see 2‐4 patients every 6 weeks in addition to the audiology clinic. The purpose of this study is to identify and describe the UCSD SRFCP ENT population and to describe this sustainable clinic model
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Utilizations and Outcomes of the Otolaryngology and Audiology clinic at the UCSD Student-run Free Clinic Project
The UCSD SRFCP provides healthcare to an underserved population of San Diego that otherwise does not qualify for access to care3. While the clinic mainly provides primary care, there are also a number of specialty clinics available, including otolaryngology. The otolaryngology clinic began in January 2010, with the addition of audiology in early 2011. The clinic began with 1 volunteer attending and 1 audiologist who saw 2‐3 patients every 2 months. Currently, there are 2 volunteer attendings who see 2‐4 patients every 6 weeks in addition to the audiology clinic. The purpose of this study is to identify and describe the UCSD SRFCP ENT population and to describe this sustainable clinic model
Novel Repetitive Control Technique for Three Phase Four Wire Shunt Active Power Filter
This paper presents a discrete dreary control procedure for three stage four wire (3P4W) shunt enthusiastic force channel (SEPF). By and large, the control plan for power gadgets includes two control circles: slow acting external voltage circle and speedy performing inside current control circle. The reference for inward current circle is occasional in climate and can't be basically followed by PI controller. The dreary regulators (RC) are notable for their following capacity of occasional sign and deal high addition at every one of the frequencies. The high increase in higher recurrence reach might lead towards unsteadiness. Hence, in proposed work, the standard RC is changed by square its affectability work. Fluffy rationale regulator is utilized in this task to improve the force quality. This methodology brings about low sufficiency of affectability work while offering profound indents at low to mid frequencies range and more modest scores at high frequencies. This control approach has been reproduced and execute on 3P4W SAPF
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Life Cycle Cost Analysis Input Framework for Full Depth Recycling and Application on State Route 113 and State Route 84
Full depth recycling (FDR) has emerged as a feasible rehabilitation alternative in California. This study focuses on addressing the economic feasibility of example FDR structures using life cycle cost analysis (LCCA) that included probabilistic and deterministic life cycle agency costs and deterministic life cycle road user costs. Two LCCA case studies were performed to provide an initial understanding of the agency cost variation. Estimating roadway construction costs plays a key role in pavement LCCA and long-term planning. Materials costs per functional unit are the major input values affecting pavement cost and total construction cost, and they are dependent on project scale, market, region, risk, climate, and economic circumstances. Publicly available contract cost data from past roadway construction activities on the California state highway network were used in this study. Economies of scale suggest that high quantities of materials would have lower unit costs. Unsupervised machine learning techniques were employed to divide the available data into four volume categories (low, medium, high, very high) based on material quantities in a project to accomplish the probabilistic LCCA. Work zone delay road user costs were estimated in RealCost-CA and incorporated into the life cycle cost of each alternative. Case studies were conducted for rehabilitation of two California highways, State Route 113 (SOL 113) and State Route 84 (YOL 84), for a 60-year design life. Two different pavement rehabilitation alternatives were considered for the project, an FDR structure and a hot mix asphalt HMA reconstruction, along with their respective maintenance and rehabilitation sequences. Two different pavement structural design methods were also included in the study to enable comparison: R-value and CalME
Life Cycle Cost Analysis Input Framework for Full Depth Recycling and Application on State Route 113 and State Route 84
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