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Lotus, A.F.,Kang, Y.C.,Walker, J.I.,Ramsier, R.D.,Chase, G.G. Elsevier 2010 Materials science and engineering B. Advanced Func Vol.166 No.1
Zinc oxide nanofibers doped with aluminum oxide were prepared by sol-gel processing and electrospinning techniques using polyvinylpyrrolidone (PVP), zinc acetate and aluminum acetate as precursors. The resulting nanofibers were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis spectroscopy, and current-voltage (I-V) properties. The nanofibers had diameters in the range of 60-150nm. The incorporation of aluminum oxide resulted in a decrease in the crystallite sizes of the zinc oxide nanofibers. Aluminum oxide doped zinc oxide (AOZO) nanofibers exhibited lower bandgap energies compared to undoped zinc oxide nanofibers. However, as the aluminum content (Al/(Al+Zn)x100%) was increased from 1.70at.% to 3.20at.% in the electrospinning solution, the bandgap energy increased resulting in lower conductivity. The electrical conductivity of the AOZO samples was found to depend on the amount of aluminum dopant in the matrix as reflected in the changes in oxidation state elucidated from XPS data. Electrospinning was found to be a productive, simple, and easy method for tuning the bandgap energy and conductivity of zinc oxide semiconducting nanofibers.
Hemostats in Spine Surgery: Literature Review and Expert Panel Recommendations
J.C. Le Huec,S. AlEissa,A.J. Bowey,B. Debono,A. El-Shawarbi,N. Fernández-Baillo,K.S. Han,A. Martin-Benlloch,R. Pflugmacher,P. Sabatier,D. Vanni,I. Walker,T. Warren,S. Litrico 대한척추신경외과학회 2022 Neurospine Vol.19 No.1
Bleeding in spine surgery is a common occurrence but when bleeding is uncontrolled the consequences can be severe due to the potential for spinal cord compression and damage to the central nervous system. There are many factors that influence bleeding during spine surgery including patient factors and those related to the type of surgery and the surgical approach to bleeding. There are a range of methods that can be employed to both reduce the risk of bleeding and achieve hemostasis, one of which is the adjunct use of hemostatic agents. Hemostatic agents are available in a variety of forms and materials and with considerable variation in cost, but specific evidence to support their use in spine surgery is sparse. A literature review was conducted to identify the pre-, peri-, and postsurgical considerations around bleeding in spine surgery. The review generated a set of recommendations that were discussed and ratified by a wider expert group of spine surgeons. The results are intended to provide a practical guide to the selection of hemostats for specific bleeding situations that may be encountered in spine surgery.
Blockade of cannabinoid 1 receptor improves GLP-1R mediated insulin secretion in mice
Gonzalez-Mariscal, I.,Krzysik-Walker, S.M.,Kim, W.,Rouse, M.,Egan, J.M. North-Holland 2016 Molecular and cellular endocrinology Vol.423 No.-
<P>The cannabinoid 1 receptor (CBI) is an important regulator of energy metabolism. Reports of in vivo and in vitro studies give conflicting results regarding its role in insulin secretion, possibly due to circulatory factors, such as incretins. We hypothesized that this receptor may be a regulator of the entero-insular axis. We found that despite lower food consumption and lower body weight postprandial GLP-1 plasma concentrations were increased in CB1(-/-) mice compared to CB1(+/+) mice administered a standard diet or high fat/sugar diet. Upon exogenous GLP-1 treatment, CB1(-/-) mice had increased glucose stimulated insulin secretion. In mouse insulinoma cells, cannabinoids reduced GLP-1R-mediated intracellular CAMP accumulation and subsequent insulin secretion. Importantly, such effects were also evident in human islets, and were prevented by pharmacologic blockade of CB1. Collectively, these findings suggest a novel mechanism in which endocannabinoids are negative modulators of incretin-mediated insulin secretion. (C) 2015 Elsevier Ireland Ltd. All rights reserved.</P>
An eight-user UMTS channel unit Processor for 3GPP base station applications
Prokop, T.,Thomas, C.,Bickerstaff, M.,Niemasz, J.,Bernadac, P.,Saintot, P.,Laufer, R.,Bescher, D.,Michel, R.,Walker, B.,Derriennic, F.,Burban, N.,Le Pape, E.,Moreau, J.P.,Cha, I.,Angioni, S.,Mhirsi, K IEEE 2004 IEEE journal of solid-state circuits Vol.39 No.9
We present a multi-user W-CDMA baseband channel unit processor for cellular base station applications. The ASIC is compliant with the 3GPP/UMTS standard and exceeds 3GPP minimum requirements for high-speed data by 2.2-6.2 dB. It supports up to eight users simultaneously, with a mix of voice and data services and a maximum uplink data rate of 384 kb/s and maximum downlink data rate of 2 Mb/s. The ASIC implements preamble detection, searching, demodulation RAKE-finger processing, channel coding/decoding for voice and data services, and transmission functions. It is coupled to a DSP to form a complete channel element for eight users.
Achievements and lessons learned from the operation of KSTAR plasma control system upgrade
Hahn, Sang-hee,Penaflor, B.G.,Milne, P.G.,Bak, J.G.,Eidietis, N.W.,Han, H.,Hong, J.S.,Jeon, Y.M.,Johnson, R.D.,Kim, H.-S.,Kim, HeungSu,Kim, Y.J.,Kwon, G.I.,Lee, W.R.,Woo, M.H.,Sammuli, B.S.,Walker, M. Elsevier 2018 Fusion engineering and design Vol.130 No.-
<P><B>Abstract</B></P> <P>Results on the integration and the operation of the KSTAR plasma control system (PCS) upgrade are given. Real-time hardware, new realtime-capable operating system, and a brand-new data acquisition are assembled in order to extend the performance and compatibility with modern computer systems. The first full commissioning and eventual routine use performed in 2016 so that the system can now acquire more than 400 channels for more than 100 seconds of data with 5 kHz sampling. The performance test results are summarized, featuring In/Out streaming echo tests and the synchronization verifications. Examples of general performance improvements are demonstrated, and additional features added to the software are also described.</P>