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Hong Lei, Qian Gu, Ruling Chen, Zhanyong Wang
Abrasives are one of key influencing factors on surface quality during chemical mechanical polishing (CMP). Silica sol, a widely used abrasive in CMP slurries for sapphire substrates, often causes lower material removal rate (MRRs). In the present paper, Fe-doped colloidal SiO<sub>2</sub> composite abrasives were prepared by a seed-induced growth method in order to improve the MRR of sapphire substrates. The CMP performance of Fe-doped colloidal SiO<sub>2</sub> abrasives on sapphire substrates was investigated using UNIPOL-1502 CMP equipment...
August 20, 2015: Applied Optics
Krishnakumar Nair, Karthikeyan Umapathy, Talha Farid, Stephane Masse, Erin Mueller, Radhika V Sivanandan, Kwaku Poku, Vivek Rao, Vidhya Nair, Jagdish Butany, Raymond E Ideker, Kumaraswamy Nanthakumar
BACKGROUND: We investigated patterns of intramural activation in early human ventricular fibrillation (VF) and hypothesized that intramural reentry colocalizes to sites with increased intramural fibrosis. METHODS AND RESULTS: Thirteen human Langendorff hearts were used for this study. Twenty-five plunge needles (4 unipoles/needle) were used to map 100 intramural sites. For the global mapping component, 11 20-s episodes of early VF were studied in 6 hearts. Simultaneous activation of all 4 electrodes was the most common pattern observed in 48...
October 2011: Circulation. Arrhythmia and Electrophysiology
C K Lau, Y S Heng, M A Hussain, M I Mohamad Nor
The performance of a chemical process plant can gradually degrade due to deterioration of the process equipment and unpermitted deviation of the characteristic variables of the system. Hence, advanced supervision is required for early detection, isolation and correction of abnormal conditions. This work presents the use of an adaptive neuro-fuzzy inference system (ANFIS) for online fault diagnosis of a gas-phase polypropylene production process with emphasis on fast and accurate diagnosis, multiple fault identification and adaptability...
October 2010: ISA Transactions
Feifei Wang, Wangzhou Shi, Haosu Luo
In present work, a ring-type unipoled step-down piezoelectric transformer with the dimensions of Phi16x0.7 mm(3) was designed and fabricated using relaxor ferroelectric single crystal (1-x)Pb(Mg(1/3)Nb(2/3))O(3)-xPbTiO(3) (PMN-PT). Both the input and output parts of this transformer were poled along the thickness direction, utilizing the radial vibration mode of PMN-PT. The electrical measurement results indicated that under the matching load resistance of 257 Omega, a voltage transformation ratio of 0.44 was obtained at the resonance frequency of 105 kHz...
April 2010: Review of Scientific Instruments
Thomas H Everett, Emily E Wilson, George S Hulley, Jeffrey E Olgin
BACKGROUND: Epicardial mapping has shown that atrial substrate may play a role in the characteristics of the resulting atrial fibrillation (AF). However, it is not known whether these differences also occur in 3 dimensions. OBJECTIVE: This study sought to examine the 3-dimensional characteristics of AF by simultaneously analyzing AF on the epicardial and endocardial surfaces. METHODS: Dogs were divided into 5 groups: congestive heart failure (CHF), rapid atrial pacing (RAP), mitral regurgitation (MR), control, and methylcholine...
April 2010: Heart Rhythm: the Official Journal of the Heart Rhythm Society
T Hemsel, S Priya
Piezoelectric transformers are increasingly getting popular in the electrical devices owing to several advantages such as small size, high efficiency, no electromagnetic noise and non-flammable. In addition to the conventional applications such as ballast for back light inverter in notebook computers, camera flash, and fuel ignition several new applications have emerged such as AC/DC converter, battery charger and automobile lighting. These new applications demand high power density and wide range of voltage gain...
December 22, 2006: Ultrasonics
H J Sih, E J Berbari, D P Zipes
INTRODUCTION: The purpose of this study was to investigate the mechanisms by which atrial linear ablation lesions eliminate atrial fibrillation (AF). METHODS AND RESULTS: With an array of 112 unipole, epicardial maps of electrically induced AF in 6 dogs (acute group), self-sustained AF in 6 dogs (chronic group), and sinus rhythm and atrial pacing in 3 dogs (control group) were analyzed before and after creating linear radiofrequency ablation lesions in both atria that eliminated the AF...
September 1997: Journal of Cardiovascular Electrophysiology
T Miura, J Sakuragi, M Kawamura, M Fukasawa, E N Moriyama, T Gojobori, K Ishikawa, J A Mingle, V B Nettey, H Akari
We designed a universal primer (UNIPOL) for DNA amplification of AIDS-related viruses. The phylogenetic tree constructed from the presumed sequences amplified with UNIPOL was representative of the tree calculated from whole pol gene sequences so far reported. UNIPOL was able to amplify the sequences of all four major groups of primate lentiviruses and also that of a distinct virus from a Ghanaian patient with an AIDS-related complex, designated GH-2. This strain scarcely hybridizes with known HIV/simian immunodeficiency virus (SIV) DNA probes...
December 1990: AIDS
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