601 research outputs found
Biocompatible and antibacterial silver tantalum oxide thin film by magnetron sputtering for surgical applications / Rodianah Alias
No full textStainless steel (SS) is used extensively for healthcare, hygiene and surgical applications due to its excellent corrosion resistance and adequate mechanical strength. SS grade 316L is the most widely employed stainless steel owing to the high corrosion resistance, good mechanical properties, resistance to sensitization and ease of fabrication. Nonetheless, stainless steel lacks antibacterial activity. To incorporate the antimicrobial characteristic in SS 316L-based surgical instruments, a new nanocomposite thin film coating comprising silver (Ag) and tantalum oxide (Ta2O5) was deposited by physical vapor deposition (PVD) reactive magnetron sputtering in this research. The delamination of the ceramic layers on the SS 316L substrate is one of the major limitations arising from insufficient crystallization and poor adhesion strength. It was found that the adhesion strength improved in a precisely controlled thermal treatment process. The microstructure, morphology, phases, elemental, structure, micromechanical properties, surface chemistry, hydrophobicity, toxicity and antibacterial performance of the as-deposited and annealed thin film specimens were analyzed to determine the characteristics of the developed layers. The thermal treatment setup involved temperatures of 250 to 850 °C that progressively increased the crystallinity and segregation of Ag at the surface. The highest adhesion strength was achieved when the coated samples were annealed at 400 °C, with 154 % improvement achieved compared to the as-deposited layer. The samples annealed at 400 °C demonstrated excellent antibacterial performance against gram-negative Escherichia coli (ATCC 15597) and gram-positive Staphylococcus aureus (NCTC 6571) according to inhibition zone measurements. Ag/Ag-Ta2O5 prepared at 400 °C exhibited significantly superior biocompatibility (cell attachment and proliferation of seeded human bone marrow-derived mesenchymal stromal cells) compared to Ag/Ag-Ta2O5 annealed at 700 °C as well as SS 316L
The effect of substrate and enzyme concentration to the fructooligosaccharides (FOS) production
No full textThe fructooligosaccharides (FOS) are oligosaccharides of fructose that have simple molecule. They can produced by action of fructosyltransferase with sucrose. The fructooligosaccharides is significant to the diabetec and colon disease due to its function reducing the content of sugar in blood. FOS also has a function of prebiotic whereas capable help in human digestion colon. The purpose of this research to determine the effect of substrate and enzyme and the optimum both two of these factor to produce FOS The experiment is carried out used 40 to 80% (w/v) of sucrose concentration and 5% to 9% (w/v) of enzyme concentration in water bath at temperature of 60 °C at 100 rpm. The samples were analyzed by using HPLC, UV-Vis, and TOC to determine FOS concentration, sucrose residual and TOC content respectively. The Design Expert Software also involve to determine the optimum substrate and enzyme to produce FOS. From the result acquire, Increased 40 to 60% of sucrose concentration resulted in increased 96% FOS production and constant after 60% of sucrose concentration approximately at 258 mg/ml. As increasing of enzyme concentration, the production of FOS also increase up to the maximum point of 241 mg/ml FOS production at 5% to 7% enzyme concentration and decrease after 7% enzyme concentration to 134 mg/ml. By using Design Expert Software, increased of sucrose concentration, the FOS production also increase. Increased of enzyme concentration, the FOS production also increase. The optimum condition of substrate and enzyme concentration is 50% and 7% to produce 552.857 mg/ml concentration of FOS. -Author
An Inexpensive & Safe Method for Preparation of Caryophyllene Oxide
No full textCaryophyllene oxide which exists as white crystalline solids with melting points of 62 °C, is widely used as an important material in perfumery industry and recently had been patented as antitumor agent. This 99% pure oxide compound is very muchmore expensive than the original caryophyllene due to the difficulty in production. Experiments were carried out to produce caryophyllene oxide by using inexpensive and safe method. In this study, four objectives were studied; extraction, separation, purification of caryophyllene from clove buds which were later used in this synthesis of caryophyllene oxide in this study. In extraction, four methods were used, cleaner- ultrasonic, hydrodistillation, steam distillation and microwave to obtain clove oil and found that, hydro distillation method was found to give the highest yield of clove oil. For separation process the cayophyllene and the other non-polar molecules in clove oil were separated from eugenol, the highest yield for both clove bud and clove leaf were achieved at a ratio of clove oil: sodium hydroxide of 1: 2. Purification of caryophyllene by using vacuum distillation consist 94% component of a mixture of caryophyllene, and 5.8% alpha-cubebene by using GC/MS analyzer at 136 °C. Caryophyllene oxide was then synthesized by using four different acids, formic acid, acetic anhydride, 3-chloroperbenzoic acid, and acetic acid. The highest percentage of caryophyllene oxide formed in solution analysed by GC/MS was by formic acid (86.47%), followed by 3-chloroperbenzoic acid (81.47%), acetic anhydride (77.04%), and acetic acid (75.33%). Caryophyllene oxide was then crystallized at low temperature until subsequent analysis showed that it is 99% pure
Pushing Alias Resolution to the Limit
No full textIn this paper, we show that utilizing multiple protocols offers a unique opportunity to improve IP alias resolution and dual-stack inference substantially. Our key observation is that prevalent protocols, e.g., SSH and BGP, reply to unsolicited requests with a set of values that can be combined to form a unique device identifier. More importantly, this is possible by just completing the TCP hand-shake. Our empirical study shows that utilizing readily available scans and our active measurements can double the discovered IPv4 alias sets and more than 30× the dual-stack sets compared to the state-of-the-art techniques. We provide insights into our method's accuracy and performance compared to popular techniques.Cyber Securit
An alias of I
No full textAn Alias of I is a manuscript of poems that emerge from familial myth into the sensoria and materiality of the Anthropocene, expanding from claustrophobic New Jersey suburbia to ancestral and rented homes in Malacca, Hong Kong, New York, California, and elsewhere. Blending temporality and locality, these movements through space incite explorations of the self, parsing consciousness, interiority, and perception. These poems reckon with inherited violence and the throughline of colonialism, immigration, and intergenerational trauma.
An Alias of I investigates identity and inheritance through the lens of queerness, neurodivergence, and Asian American diaspora. At once familiar and alien, these poems render modernity and selfhood into a landscape where the boundaries between bodies, environments, and stories—past and present—all blur. These meditations on trauma, loss, and mundanity reveal new possibilities that materialize through joy, intimacy, and found signs. An Alias of I embraces hybrid forms, blending prose, lyric, visual, and narrative poems, to explore emotional processing and rationalization through various angles and perspectives, attempting to capture the movement—focus points, detours, ruminations—of an evasive mind working toward an end.
As the title insinuates, the poems interrogate the mutability and instability of personhood. Through these poems, readers are asked to reckon with the gap between externality—who they want to be, how they want to be perceived, desires—and the internal, elusive self. From this tension emerges the difficulty and transcendence of intimacy and community. These poems guide readers through these spaces and worlds with humor, nonchalance and a sense of possibility, inviting readers to keep an open eye.M.F.A.Includes bibliographical reference
Enhancement of as-sputtered silver-tantalum oxide thin film coating on biomaterial stainless steel by surface thermal treatment
No full textTwo Steps Forward, One Step Back: The Selling of Charlie\u27S Angels and Alias
No full textThe author analyzes various elements of the promotional campaigns for two recent female-driven action narratives, the film Charlie\u27s Angels and the television series Alias. The analysis suggests that these inconsistent and often regressive campaigns weaken the potentially progressive gender images offered by the film and series
Using N-gram Analysis for Forensic Author Identification and Text Relatedness
No full textAM Session
Using N-gram Analysis for Forensic Author Identification and Text Relatedness
Carole Chaski, ALIAS Technology LLC and Institute for Linguistic Evidence, Inc, US
Dynamic load balancing for petascale quantum Monte Carlo applications: The Alias method
No full textDiffusion Monte Carlo is a highly accurate Quantum Monte Carlo method for electronic structure calculations of materials, but it requires frequent load balancing or population redistribution steps to maintain efficiency on parallel machines. This step can be a significant factor affecting performance, and will become more important as the number of processing elements increases. We propose a new dynamic load balancing algorithm, the Alias Method, and evaluate it theoretically and empirically. An important feature of the new algorithm is that the load can be perfectly balanced with each process receiving at most one message. It is also optimal in the maximum size of messages received by any process. We also optimize its implementation to reduce network contention, a process facilitated by the low messaging requirement of the algorithm: a simple renumbering of the MPI ranks based on proximity and a space filling curve significantly improves the MPI Allgather performance. Empirical results on the petaflop Cray XT Jaguar supercomputer at ORNL show up to 30% improvement in performance on 120,000 cores. The load balancing algorithm may be straightforwardly implemented in existing codes. The algorithm may also be employed by any method with many near identical computational tasks that require load balancing.Journal ArticlePublishe
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