An Exact Solution for Flow Transients in Two-Phase Systems by the Method of Characteristics

1973 ◽  
Vol 95 (4) ◽  
pp. 470-476 ◽  
Author(s):  
J. M. Gonzalez-Santalo ◽  
R. T. Lahey
Keyword(s):  
Exact Solution ◽  
Method Of Characteristics ◽  
Accurate Analysis ◽  
Two Phase ◽  
Design Considerations ◽  
The Method Of Characteristics ◽  
System Flow ◽  
Hypothetical Accident ◽  
Phase Systems ◽  
Important Design

One of the important design considerations in modern water-cooled nuclear reactors is their thermal performance during hypothetical accident situations. However, an accurate analysis of the system thermal-hydraulics is required before the thermal margins can be appraised. In this paper, an analysis based on the method of characteristics has been developed by which the exact solution to flow decay transients in homogeneous two-phase systems can be obtained. The exact solution presented yields the system flow and quality at each point in space and time during an exponential flow decay transient. These parameters can then be combined with an appropriate CHF correlation to predict the occurrence of transient CHF.

scholarly journals Exact Solutions of Fragmentation Equations with General Fragmentation Rates and Separable Particles Distribution Kernels

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
S. C. Oukouomi Noutchie ◽  
E. F. Doungmo Goufo
Keyword(s):  
Exact Solution ◽  
Evolution Equation ◽  
Laplace Transform ◽  
Exact Solutions ◽  
Method Of Characteristics ◽  
Open Problems ◽  
The Method Of Characteristics ◽  
Sudden Appearance ◽  
Many Particles

We make use of Laplace transform techniques and the method of characteristics to solve fragmentation equations explicitly. Our result is a breakthrough in the analysis of pure fragmentation equations as this is the first instance where an exact solution is provided for the fragmentation evolution equation with general fragmentation rates. This paper is the key for resolving most of the open problems in fragmentation theory including “shattering” and the sudden appearance of infinitely many particles in some systems with initial finite particles number.

Continuous purification of antibodies from cell culture supernatant with aqueous two-phase systems: From concept to process

2013 ◽  
Vol 8 (3) ◽  
pp. 352-362 ◽  
Author(s):  
Paula A. J. Rosa ◽  
Ana M. Azevedo ◽  
S. Sommerfeld ◽  
Martina Mutter ◽  
Werner Bäcker ◽  
...  
Keyword(s):  
Cell Culture ◽  
Culture Supernatant ◽  
Cell Culture Supernatant ◽  
Two Phase ◽  
Aqueous Two Phase Systems ◽  
Phase Systems

scholarly journals Perceived Facilitators and Barriers to Engaging with a Digital Intervention among Those with Food Insecurity, Binge Eating, and Obesity

Nutrients ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 2458
Author(s):  
Anu Venkatesh ◽  
Angela Chang ◽  
Emilie A. Green ◽  
Tianna Randall ◽  
Raquel Gallagher ◽  
...  
Keyword(s):  
Binge Eating ◽  
Food Insecurity ◽  
Future Research ◽  
Grocery Stores ◽  
User Centered Design ◽  
Design Considerations ◽  
Digital Intervention ◽  
Intervention Cost ◽  
Facilitators And Barriers ◽  
Important Design

Interventions that address binge eating and food insecurity are needed. Engaging people with lived experience to understand their needs and preferences could yield important design considerations for such interventions. In this study, people with food insecurity, recurrent binge eating, and obesity completed an interview-based needs assessment to learn facilitators and barriers that they perceive would impact their engagement with a digital intervention for managing binge eating and weight. Twenty adults completed semi-structured interviews. Responses were analyzed using thematic analysis. Three themes emerged. Participants shared considerations that impact their ability to access the intervention (e.g., cost of intervention, cost of technology, accessibility across devices), ability to complete intervention recommendations (e.g., affordable healthy meals, education to help stretch groceries, food vouchers, rides to grocery stores, personalized to budget), and preferred intervention features for education, self-monitoring, personalization, support, and motivation/rewards. Engaging people with lived experiences via user-centered design methods revealed important design considerations for a digital intervention to meet this population’s needs. Future research is needed to test whether a digital intervention that incorporates these recommendations is engaging and effective for people with binge eating and food insecurity. Findings may have relevance to designing digital interventions for other health problems as well.

Optimized and Scalable Green Extraction of Pristimerin, an Anticancerigen from Mortonia greggii, by Ethanol–Phosphate Aqueous Two-Phase Systems

2021 ◽  
Vol 60 (15) ◽  
pp. 5403-5410
Author(s):  
Martha Alicia González-Félix ◽  
Luis Alberto Mejía-Manzano ◽  
Bertha A. Barba-Dávila ◽  
Sergio O. Serna-Saldívar ◽  
José González-Valdez
Keyword(s):  
Two Phase ◽  
Green Extraction ◽  
Aqueous Two Phase Systems ◽  
Phase Systems
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