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101.
Poly(ε‐caprolactone) (PCL)/poly(amino ether) (PAE) blends were obtained by injection molding without any previous extrusion step in an attempt to (i) contribute to the knowledge of the relation between structure and mechanical properties in these type of blends composed of a rubbery and a glassy polymer and (ii) to find out to which extent are the PCL/PAE blends compatible, and therefore whether the biodegradability of PCL can be added as a characteristic of PAE‐based applications. PCL/PAE blends are composed of a crystalline PCL phase, a pure amorphous PCL phase, and a PAE‐rich phase where some PCL is present. The presence of some dissolved and probably unreacted PCL in the PAE‐rich phase led to a low interfacial tension as observed by the small size of the dispersed particles and the large interfacial area. The dependence on composition of both the modulus of elasticity and the yield stress of the blends was parallel to that of the orientation level. The elongation at break showed values similar to those of PAE in PAE‐rich blends, and was slightly synergistic in very rich PCL compositions; this behavior reflects a change in the nature of the matrix, from glassy to rubbery. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
102.
Ozan Nazım Çiftçi Fahrettin Göğüş Sibel Fadıloğlu 《Journal of the American Oil Chemists' Society》2010,87(9):1013-1018
Olive pomace oil is a by-product of olive oil processing and it is considered a low-quality oil. Considering its suitable
triacylglycerol (TAG) composition, this work aimed to convert refined olive pomace oil (ROPO) to a cocoa butter (CB)-like
fat using sn-1,3 specific lipase, and to investigate its performance as a partial CB replacer. CB-like fat was produced from olive pomace
oil by sn-1,3-specific lipase-catalyzed acidolysis in a packed bed reactor. Binary blends of CB and CB-like fat (CB:CB-like fat) were
prepared in different proportions, and their physicochemical characteristics [TAG content, melting profile, solid fat content
(SFC) and microstructure] were investigated. The contents of 1,3-dipalmitoyl-2-oleoyl-glycerol (POP), 1(3)-palmitoyl-3(1)stearoyl-2-oleoyl-glycerol
(POS) and 1,3-distearoyl-2-oleoyl-glycerol (SOS) in the 100:0 blend were 18.9, 33.1 and 24.7%, respectively. These contents
decreased to 11.0, 20.0 and 11.7%, respectively, in the 0:100 blend. Although the melting point (28.5 °C) did not change significantly
above 30% CB-like fat addition, the shape of the melting peak became wider and irregular. An isothermal solid diagram of SFC
showed that better compatibility was observed at temperatures above 35 °C for all blends. Addition of over 30% CB-like fat
caused significant difference in the microstructure. 相似文献
103.
104.
Machireddy Gari Gnaneswara Reddy Kondlalli Ganesh Kumar Sabir Ali Shehzad Tariq Javed Tehmina Ambreen 《亚洲传热研究》2019,48(6):2262-2275
This article considers the flow and heat transfer of a single and multi‐walled carbon nanotube over a sensor surface. For this persistence, a mathematical forming is established with the aspects of thermal radiation. In addition, the stimuli of magnetic properties and variable thermal conductivity are presented. By means of noteworthy conversions, nonlinear PDEs are altered into nonlinear ODEs and elucidated via a numerical approach in virtue of the Runge‐Kutta fourth order method scheme. The repercussion of countless variables of flow and energy transfer characteristics are portrayed and conferred. These upshots portray that the enhancement of heat is bounteous in a single‐wall nanotube when compared with multiwall nanotubes. Further, the velocity field is contracted for enhancing the values of . 相似文献
105.
106.
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108.
Iftikhar Ahmad Syed Zulfiqar Ali Shah Ambreen Shahnaz Sadeeq Jan Salma Noor Wajeeha Khalil Fazal Qudus Khan Muhammad Iftikhar Khan 《计算机、材料和连续体(英文)》2021,66(1):157-164
Classical algorithms and data structures assume that the underlying
memory is reliable, and the data remain safe during or after processing. However,
the assumption is perilous as several studies have shown that large and inexpensive memories are vulnerable to bit flips. Thus, the correctness of output of a classical algorithm can be threatened by a few memory faults. Fault tolerant data
structures and resilient algorithms are developed to tolerate a limited number of
faults and provide a correct output based on the uncorrupted part of the data. Suf-
fix tree is one of the important data structures that has widespread applications
including substring search, super string problem and data compression. The fault
tolerant version of the suffix tree presented in the literature uses complex techniques of encodable and decodable error-correcting codes, blocked data structures
and fault-resistant tries. In this work, we use the natural approach of data replication to develop a fault tolerant suffix tree based on the faulty memory random
access machine model. The proposed data structure stores copies of the indices
to sustain memory faults injected by an adversary. We develop a resilient version
of the Ukkonen’s algorithm for constructing the fault tolerant suffix tree and
derive an upper bound on the number of corrupt suffixes. 相似文献
109.
M. Shahbaz S. Yusup M. Y. Naz S. A. Sulaiman A. Inayat A. Partama 《Particulate Science and Technology》2017,35(2):150-157
The increased biomass utilization has triggered the use of palm oil waste as fuel for gasification in Malaysia. In this study, pioneering work was conducted on three types of palm oil wastes namely palm kernel shell (PKS), palm oil fronds (POF), and empty fruit bunches (EFB). Minimum air velocity (Umf) required for fluidization of the tested biomass was determined experimentally in a swirling fluidized bed, by considering the effect of bed weight, density, particle size, fluidized bed height, pressure drop, and bed voidage. It was revealed that higher the particle size the smaller will be the voidage, which consequently affects the minimum fluidization velocity. Umf was increased with a decrease in voidage size. However, a direct relationship was found between particle size and Umf. Overall highest Umf was determined for EFB followed by POF and PKS. Fluidized bed height was increased by decreasing the particle size regardless of the biomass type. Highest unsettled bed height was obtained with PKS on account of its low density among all the test fuels. It was concluded that optimization of the fluidized bed for each type of biomass, particle size, and density is explicitly required for a low-cost energy conversion process. 相似文献
110.
S. Shukrullah N. M. Mohamed M. S. Shaharun M. Y. Naz 《Materials and Manufacturing Processes》2016,31(12):1537-1542
To date, focus of the research activities in nanoscience was to control the chemical vapor deposition (CVD) growth of carbon nanotubes (CNTs) by changing the precursor pressure and process temperature. The effect of the precursor flow rate and process time on CNTs growth parameters has been overlooked in past studies and therefore is very little known. This study was focused on the optimization of the ethylene flow rate and CVD process time for CNTs growth over Fe2O3/Al2O3 catalyst in a fluidized bed chemical vapor deposition (FBCVD) reactor, operating at atmospheric pressure. Argon and hydrogen were considered as the carrier and supporting gases, respectively. Transmission electron microscope (TEM) and Scanning Electron Microscopy (SEM) were used to investigate the surface morphology, nanostructures, purity and yield of the grown CNTs. In-depth analysis revealed an increase in tube length, yield and the carbon concentration with ethylene flow rate in the range of 50–110 sccm. However, an inverse relationship between flow rate and tube diameter distribution was predicted in the given work. The most favorable results were obtained at an ethylene flow rate of 100 sccm and a CVD process time of 60 minutes. The dense and homogeneous growth of relatively pure nanotubes of increased tube length and narrow diameter distribution, in the range of 20–25 nm, was observed at optimized flow rate and process time. 相似文献