307 research outputs found
XPS Characterization of Friedel-Crafts Cross-Linked Polystyrene
The combination of a difunctional alkylating agent, either hydroxymethylbenzyl chloride or α,α′-dichloroxylene with polystyrene or high-impact polystyrene together with a Friedel-Crafts catalyst, 2-ethylhexyldiphenylphosphate, and an amine to react with hydrogen chloride has been studied by X-ray photoelectron spectroscopy. The results confirm what had been suggested from previous investigations using thermogravimetric analysis; cross-linking of the polymer occurs as the temperature is raised and the alcohol-containing alkylating agent gives a greater amount of cross-linking than does the dichloro compound
Automated Identication of Atrial Fibrillation from Single-lead ECGs Using Multi-branching ResNet
Atrial fibrillation (AF) is the most common cardiac arrhythmia, which is
clinically identified with irregular and rapid heartbeat rhythm. AF puts a
patient at risk of forming blood clots, which can eventually lead to heart
failure, stroke, or even sudden death. It is of critical importance to develop
an advanced analytical model that can effectively interpret the
electrocardiography (ECG) signals and provide decision support for accurate AF
diagnostics. In this paper, we propose an innovative deep-learning method for
automated AF identification from single-lead ECGs. We first engage the
continuous wavelet transform (CWT) to extract time-frequency features from ECG
signals. Then, we develop a convolutional neural network (CNN) structure that
incorporates ResNet for effective network training and multi-branching
architectures for addressing the imbalanced data issue to process the 2D
time-frequency features for AF classification. We evaluate the proposed
methodology using two real-world ECG databases. The experimental results show a
superior performance of our method compared with traditional deep learning
models
Resource allocation in cellular CDMA systems with cross- layer Optimization
Ph.DDOCTOR OF PHILOSOPH
TREM-1 Promotes Pancreatitis-Associated Intestinal Barrier Dysfunction
Severe acute pancreatitis (SAP) can cause intestinal barrier dysfunction (IBD), which significantly increases the disease severity and risk of mortality. We hypothesized that the innate immunity- and inflammatory-related protein-triggering receptor expressed on myeloid cells-1 (TREM-1) contributes to this complication of SAP. Thus, we investigated the effect of TREM-1 pathway modulation on a rat model of pancreatitis-associated IBD. In this study we sought to clarify the role of TREM-1 in the pathophysiology of intestinal barrier dysfunction in SAP. Specifically, we evaluated levels of serum TREM-1 and membrane-bound TREM-1 in the intestine and pancreas from an animal model of experimentally induced SAP. TREM-1 pathway blockade by LP17 treatment may suppress pancreatitis-associated IBD and ameliorate the damage to the intestinal mucosa barrier
- …