168 research outputs found
Partial Cholecystectomy Safe and Effective
Patients undergoing surgical treatment for calculous disease were considered to have had a partial
cholecystectomy performed when a part of the gall bladder wall was retained for technical reasons.
Forty patients underwent partial cholecystectomy: for chronic cholecystitis (20), acute cholecystitis (4),
Mirizzi's syndrome (14), portal hypertension or partially accesible gall bladder (one patient each). Four
patients (10%) developed infective complications and two patients had retained common bile duct
stones. In a mean follow up period of 13 months (range 1–36 mths), only 3 patients have ongoing mild
dyspeptic symptoms while the rest have remained asymptomatic. Partial cholecystectomy has been
found to be a safe and effective procedure in difficult cholecystectomy situations, since it combines the
merits of cholecystectomy and cholecystostomy
Modeling Distillers Dried Grains with Solubles (DDGS) Mass Flow Rate as Affected by Drying and Storage Conditions
Ethanol production in 2015 was over 15 million gallons in the United States, and it is projected to increase in the next few years to meet market demands. With the continued growth in the ethanol industry, there has been enormous expansion in distillers grains production. Because the local market for distillers dried grains with solubles (DDGS) is often saturated, it is essential to transport DDGS long distances, across the United States and to international markets. Caking and agglomeration of DDGS particles in hoppers and other storage structures are typical during transportation. The current study deals with DDGS prepared by combining condensed distillers solubles (CDS) with distillers wet grains and then drying at varying temperatures. DDGS was stored in conical hoppers under varying ambient temperature, consolidation pressure, and time conditions. We investigated the effects of CDS (10, 15, and 20% wb), drying temperature (100, 200, and 300°C), drying time (20, 40, and 60 min), cooling temperature (0, 25, and 50°C), consolidation pressure (0, 1.72, and 3.43 kPa), and consolidation time (0, 3, and 6 days) levels on various flow parameters. To examine these factors, Taguchi’s experimental design with an L18 orthogonal array was implemented. Response surface modeling yielded mass flow rate = f(Hausner ratio, angle of repose) with R2 = 0.99, and it predicted moisture content for good, fair, and poor flow. Results showed that drying temperature, drying time, and cooling type were the main factors in predicting mass flow rate. The Johansson model for predicted mass flow rate was calibrated with experimental data, and a new parameter, compressibility factor, with a value of 0.96 g2/(min cm3), was determined to quantify the divergence of compressible and cohesive materials (such as DDGS) for free-flowing bulk solids. Thus, the predicted models may be beneficial for quantitative understanding of DDGS flow
Correction due to finite speed of light in absolute gravimeters
Correction due to finite speed of light is among the most inconsistent ones
in absolute gravimetry. Formulas reported by different authors yield
corrections scattered up to 8 Gal with no obvious reasons. The problem,
though noted before, has never been studied, and nowadays the correction is
rather postulated than rigorously proven. In this paper we make an attempt to
revise the subject. Like other authors, we use physical models based on signal
delays and the Doppler effect, however, in implementing the models we
additionally introduce two scales of time associated with moving and resting
reflectors, derive a set of rules to switch between the scales, and establish
the equivalence of trajectory distortions as obtained from either time delay or
distance progression. The obtained results enabled us to produce accurate
correction formulas for different types of instruments, and to explain the
differences in the results obtained by other authors. We found that the
correction derived from the Doppler effect is accountable only for of
the total correction due to finite speed of light, if no signal delays are
considered. Another major source of inconsistency was found in the tacit use of
simplified trajectory models
Identification of clay minerals in binary and ternary mixtures by DTA of dye-clay complexes
Peer reviewed: YesNRC publication: Ye
Reflectance spectrophotometric study of clays and clay minerals
Peer reviewed: YesNRC publication: Ye
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