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- 저자 : Rosinski, Andrew (검색결과 2 건)
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Cristian Balcescu,Khalid Odeh,Alexander Rosinski,Jonathan Wang,Priya Prasad,Jeremi Leasure,Victor Ungurean Jr.,Dimitriy Kondrashov 대한척추신경외과학회 2019 Neurospine Vol.16 No.4
Objective: Pyogenic spinal infections account for 2%–4% of orthopaedic infections. They are often difficult to diagnose, resulting in a delay in diagnosis. Risk factors for orthopaedic and spinal infection are well-documented in the literature, yet there is a paucity of studies examining risk factors specifically for multifocal spinal infections. The objective of this study was to identify predictors of multifocal spinal infections in comparison to unifocal spinal infections. Methods: The medical records, imaging studies, and bacteriology data of 20 patients treated surgically for pyogenic spinal infection over 6 years at a tertiary referral center were reviewed and analyzed after receiving Institutional Review Board approval. Univariate and multivariate analyses were performed to identify factors associated with a multifocal spinal infection. Results: Seven patients (35%) had multifocal infections. Three were bifocal, and 4 were trifocal. Patients with surgically treated cervical or thoracic spinal infections had a high rate of concomitant multifocal spinal infections (71% and 83%, respectively). Other potential predictors (e.g., patient age, body mass index, magnetic resonance image findings, etc.) did not reach statistical significance. Each of the multifocal infections involved the lumbar spine. Conclusion: In this study, the spinal region was the only statistically significant risk factor for multifocal infection. Patients who are diagnosed with a spinal infection that requires operative treatment should have their entire spine evaluated with magnetic resonance imaging to detect multifocal involvement promptly.
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High-Temperature Activation of Zeolite-Loaded Fiber Sorbents
Sujan, Achintya R.,Koh, Dong-Yeun,Zhu, Guanghui,Babu, Vinod P.,Stephenson, Neil,Rosinski, Andrew,Du, Hai,Luo, Yang,Koros, William J.,Lively, Ryan P. American Chemical Society 2018 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.57 No.34
<P>Here, we describe the formation of zeolite LiX fiber sorbents and postfabrication activation at temperatures of 350-400 °C for use in air separations. Two polymers were considered as the support matrices for the LiX zeolites: Torlon (polyamide-imide) and Matrimid (polyimide). Torlon-based fiber sorbents exhibit approximately 4% mass loss during the high-temperature (370 °C) activation required for zeolites, which is close to the glass transition temperature of these polymers. This mass loss is accompanied by the formation of pyrolytic side products that ultimately resulted in contamination of the LiX crystals and a 73% reduction in N<SUB>2</SUB> sorption capacity at ambient temperatures. In contrast, Matrimid was found to be suitable for fiber sorbent synthesis with only 10-15% reduction in N<SUB>2</SUB> sorption capacity observed upon the thermal activation. A LiX loading of 73% in monolithic fibers (i.e., no bore) by weight was achievable. Experimental breakthrough tests at 25 °C were conducted on an activated fiber module consisting of densely packed LiX-Matrimid fiber sorbents and operated over a range of adsorption pressures (1-3.5 bar) that are often used in an actual pressure swing adsorption (PSA) process for air separation.</P> [FIG OMISSION]</BR>
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