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Fireclay bricks produced from lithomargic clay
Anthony Andrews,Simon K. Y. Gawu,Peter A. Olubambi 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
Lithomargic clay underlying Awaso bauxite deposits is non-plastic and therefore cannot be used to produce ceramic bodies. The plasticity of lithomargic clay has been enhanced by addition of 20 wt% of clay binder, moulded, dried and fired at 1350 and 1400 o C, respectively. The dwell time was varied from 30 to 120 minutes. Properties such as bulk density, apparent porosity, linear firing shrinkage, and compressive strength were investigated. Crystalline phases after firing were determined using X-ray diffraction technique. The results show the properties measured depends on both the temperature and dwell time. The optimum compressive strength for such bricks could be achieved either by firing at 1350 o C for 120 minutes or at 1400 o C for 30 minutes.
Andrews, Jeffrey G.,Buzzi, Stefano,Choi, Wan,Hanly, Stephen V.,Lozano, Angel,Soong, Anthony C. K.,Zhang, Jianzhong Charlie IEEE 2014 IEEE journal on selected areas in communications Vol.32 No.6
<P>What will 5G be? What it will <I>not</I> be is an incremental advance on 4G. The previous four generations of cellular technology have each been a major paradigm shift that has broken backward compatibility. Indeed, 5G will need to be a paradigm shift that includes very high carrier frequencies with massive bandwidths, extreme base station and device densities, and unprecedented numbers of antennas. However, unlike the previous four generations, it will also be highly integrative: tying any new 5G air interface and spectrum together with LTE and WiFi to provide universal high-rate coverage and a seamless user experience. To support this, the core network will also have to reach unprecedented levels of flexibility and intelligence, spectrum regulation will need to be rethought and improved, and energy and cost efficiencies will become even more critical considerations. This paper discusses all of these topics, identifying key challenges for future research and preliminary 5G standardization activities, while providing a comprehensive overview of the current literature, and in particular of the papers appearing in this special issue.</P>
Anthony Yeung,Andrew Roberts,Lifan Zhu,Lei Qi,Jun Zhang,Kai-Uwe Lewandrowski 대한척추신경외과학회 2019 Neurospine Vol.16 No.1
Objective: To analyze long-term clinical outcomes of endoscopic transforaminal foraminoplasty for foraminal stenosis. Methods: Long-term 5-year MacNab outcomes, visual analogue scale (VAS) scores, complications, and unintended aftercare were analyzed in a series of 86 patients who underwent endoscopic transforaminal foraminoplasty for foraminal stenosis. Results: At minimum 5-year follow-up, excellent results according to the MacNab criteria were obtained in 32 patients (37.2%), Good in 40 (46.5%), fair in 11 (12.8%), and poor in 3 (3.5%), respectively. The mean preoperative VAS was 6.15. The mean postoperative and last follow-up VAS was 3.44. Both postoperative VAS and last follow-up VAS were statistically reduced at a significance level of p<0.0001. Postoperative dysesthesia occurred in 9 patients. Another 9 patients had recurrent disc herniations (10.5%). Failure to cure with persistent pain occurred in 3 patients. Two patients developed pain postoperatively stemming from a different level. One patient experienced a postoperative hematoma which ultimately was inconsequential and did not require any additional surgery. Only 3 patients opted for revision endoscopic discectomy and another 2 for revision fusion surgery. Conclusion: Patients with symptomatic foraminal stenosis may be treated successfully with early transforaminal endoscopic decompression while maintaining favorable long-term outcomes without the need for fusion in the vast majority of patients.
SAMHD1 Has Differential Impact on the Efficacies of HIV Nucleoside Reverse Transcriptase Inhibitors
Huber, Andrew D.,Michailidis, Eleftherios,Schultz, Megan L.,Ong, Yee T.,Bloch, Nicolin,Puray-Chavez, Maritza N.,Leslie, Maxwell D.,Ji, Juan,Lucas, Anthony D.,Kirby, Karen A.,Landau, Nathaniel R.,Saraf American Society for Microbiology 2014 Antimicrobial Agents and Chemotherapy Vol.58 No.8
<P>Sterile alpha motif- and histidine/aspartic acid domain-containing protein 1 (SAMHD1) limits HIV-1 replication by hydrolyzing deoxynucleoside triphosphates (dNTPs) necessary for reverse transcription. Nucleoside reverse transcriptase inhibitors (NRTIs) are components of anti-HIV therapies. We report here that SAMHD1 cleaves NRTI triphosphates (TPs) at significantly lower rates than dNTPs and that SAMHD1 depletion from monocytic cells affects the susceptibility of HIV-1 infections to NRTIs in complex ways that depend not only on the relative changes in dNTP and NRTI-TP concentrations but also on the NRTI activation pathways.</P>
An experimental study of acoustically driven medium-scale pool fires
이기용,Andrew Lock,Anthony Hamins 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.8
A set of experiments has been conducted on a medium-scale propane fueled pool fire acoustically forced in order to facilitate repeatable measurements defining the flame’s transient behavior. The fuel flow was slightly perturbed at the pool fire’s natural frequency by a sine waveform driven with a loudspeaker which was installed under the burner. As a result of the perturbation, the puffing behavior of the pool fire and the fire shape were modified. As the magnitude of the sine wave was increased larger perturbations were clearly observed,based on the measurement of the radiative heat flux and image analysis. Temperature and soot volume fractions were measured along the center line and throughout a slice of the flame. The soot volume fractions in the flame region are in good agreement with the data of other researchers. The reproducibility of these measurements was established through several experiments. The acoustically driven flame provides the possibility of more repeatable measurements of the transient behavior of these pool fires.
Simon G. Ammanuel,Andrew K. Chan,Anthony M. DiGiorgio,Mohanad Alazzeh,Kelechi Nwachuku,Leslie C. Robinson,Errol Lobo,Praveen V. Mummaneni 대한척추신경외과학회 2020 Neurospine Vol.17 No.2
Objective: Lean management strategies aim to increase efficiency by eliminating waste or by improving processes to optimize value. The operating room (OR) is an arena where these strategies can be implemented. We assessed changes in OR efficiency after the application of lean methodology on perioperative anesthesia associated with posterior cervical spine surgeries. Methods: We utilized pre- and post-lean study design to identify inefficiencies during the perioperative anesthesia process and implemented strategies to improve the process. Patient characteristics were recorded to assess for differences between the 2 groups (group 1, prelean; group 2, post-lean). In the pre-lean period, key steps in the perioperative anesthesia process were identified that were amenable to lean implementation. The time required for each identified key step was recorded by an independent study coordinator. The times for each step were then compared between the groups utilizing univariate analyses. Results: After lean implementation, there was a significant decrease in overall perioperative anesthesia process time (88.4 ± 4.7 minutes vs. 76.2 ± 3.2 minutes, p = 0.04). This was driven by significant decreases in the steps: transport and setup (10.4 ± 0.8 minutes vs. 8.0 ± 0.7 minutes, p = 0.03) and positioning (20.8 ± 2.1 minutes vs. 15.7 ± 1.3 minutes, p = 0.046). Of note, the total time spent in the OR was lower for group 2 (270.1 ± 14.6 minutes vs. 252.8 ± 14.1 minutes) but the result was not statistically significant, even when adjusting for number of operated levels. Conclusion: Lean methodology may be successfully applied to posterior cervical spine surgery whereby improvements in the perioperative anesthetic process are associated with significantly increased OR efficiency.
An Experimental Study of Acoustically Driven Medium-Scale Pool Fires
이기용(Ki Yong Lee),Andrew Lock,Anthony Hamins 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
Experimental investigations have been performed on a medium-scale pool fire acoustically forced in order to facilitate repeatable measurements defining the flame’s transient behavior. The fuel flow was slightly perturbed at the natural frequency of the pool fire by a sine waveform driven with a loudspeaker which was installed under the burner. As a result of the perturbation, the puffing behavior of pool fire and the fire shape were modified. As the magnitude of sine wave was increased more motion was clearly observed, based on the measurement of the radiative heat flux and image analysis. Temperature and soot volume fractions were measured along the center line and throughout a slice of the burner. The soot volume fractions in the flame region are in very good agreement with other researchers. The reproducibility of these measurements is established through several series of experiments. The acoustically driven flame provides the possibility of a more repeatable measurements of the transient behavior of these pool fires.