a pebax-nano zeolite x mixed matrix membrane was fabricated and operationally characterized using single gas (co2) permeation. x-ray diffraction (xrd) analysis was used to study the arrangement of polymer chains of mixed matrix membrane. the membranes were characterized by scanning electron microscopy (sem) to study cross-sectional morphology. the single gas permeability were carried out for ne...

[1] Lunar pyroclastic beads are interpreted to represent primitive magmas derived from great depths and rapidly erupted to the surface in explosive events. However, a detailed mechanism for gas generation at great depth and rapid magma transport to the surface has not yet been described. Furthermore, the pyroclastic beads are not petrogenetically related to basalts erupted near the sampling sit...

We study diffusive transport of aqueous methane in sea sediments, which is important for formation of methane hydrate and gas deposits and has even been claimed to be principal methane transport mechanism for some geological systems. The isothermal diffusion law (Fick's law), D X = − ∇ J , which is employed in the literature for investigations on methane hydrate, is shown to significantly devia...

A gas chromatographic method of pregnanediol determination has been carried out on 24-hr. urine specimens collected during various phases of the menstrual cycle and during pregnancy. Pregnanediol values were correlated with endometrial histology and cycle day in nonpregnant subjects, and with duration of gestation during pregnancy. Determinations were performed on free pregnanediol and on the a...

We present experimental visualizations of gas flow around solid blunt bodies by NMR imaging. NMR velocimetry is a model-free and tracer-free experimental means for quantitative and multi-dimensional flow visualization. Hyperpolarization of (129)Xe provided sufficient NMR signal to overcome the low density of the dilute gas phase, and its long coherence time allows for true velocity vector mappi...

Introduction A still and bloodless operative field provides the surgeon with optimal conditions to perform delicate coronary anastomosis, while effective myocardial protection avoids myocardial injury during this process.1 Cold crystalloid cardioplegia has been the cornerstone of this strategy by inducing electromechanical arrest and further reducing oxygen demand with hypothermia.2 In spite of...

In an attempt to modify the hydrophobic surface properties of polypropylene (PP) films, this study examined the optimum process parameters of atmospheric pressure plasma (APP) using Ar gas. Under optimized conditions, the effects of a mixed gas (Ar/O2) plasma treatment on the surface-free energy of a PP film were investigated as a function of the O2 content. The polar contribution of the surfac...

Complex flow problems involving atmosphere re-entry have been one of the principal subjects of gas dynamics with the development of spaceflight. To study the aerodynamics of spacecraft re-entering Earth's atmosphere, Tsien (1946) early presented an interesting way in terms of the degree of gas rarefaction, that the gas flows can be approximately divided into four flow regimes based on the order...

The growing increase in age-related hearing loss (ARHL), with its dramatic reduction in quality of life and significant increase in health care costs, is a catalyst to develop new therapeutic strategies to prevent or reduce this aging-associated condition. In this regard, there is extensive evidence that excessive free radical formation along with diminished cochlear blood flow are essential fa...

T HE MOST significant limiting factor in the further expansion of clinical cardiac transplantation consists of the availability of suitable donors and the duration of viability of the organ following harvest. Currently, the safe limits of static cold cardiac preservation are considered to be four to six hours using the standard Stanford preservation solution as listed in Table 1. Belzer and col...