Theoretical study to investigate the impact of plasma parameters on the catalyst nanoparticle growth

THEORETICAL STUDY OF THE EFFECT OF GEOMETRICAL PARAMETERS AND LOCATION OF ROTOR IMPACT ELEMENTS OF AN IMPACT-CENTRIFUGAL GRINDER ON SPEED AND ANGLES OF CRUSHED PARTICLES FLIGHT

АГРАРНЫЙ ВЕСТНИК ВЕРХНЕВОЛЖЬЯ ◽

10.35523/2307-5872-2020-31-2-62-70 ◽

2020 ◽

Keyword(s):

Granulometric Composition ◽

Theoretical Study ◽

Process Efficiency ◽

Geometrical Parameters ◽

Grinding Process ◽

Main Work ◽

Impact Element ◽

The Impact ◽

Positive Effect ◽

Efficiency Indicators

One of efficiency indicators of grain grinders is grain granulometric composition. The basis of mixed fodder is crushed grain, the particles of which must have a leveled granulometric composition for subsequent mixing and obtaining a high-quality feed mixture. In agricultural production, hammer crushers are widely used, in which the destruction of grain occurs due to the impact of a hinged hammer. The main disadvantage of these crushers is that not the entire surface of the hammers is involved in grinding, thus reduces grinding process efficiency. A slightly different principle of material destruction is laid down in the basis of the proposed design of the shock-centrifugal grinder. Main work is performed by flat impact elements located on the rotor, which serve to accelerate crushed particles with subsequent impact of them on the bump elements. An important step in the design of new constructions of shock-centrifugal grinders is to determine size and location of the impact elements on the rotor, without which the grinding process is not possible. In the calculation method presented, the dependencies for determining the velocities and angles of a single particle flight from the surface of a flat impact element for its specified dimensions are proposed. Two variants of an impact element location on the rotor are considered and analyzed: radial and at an angle in the direction of rotor rotation. As a result of research carried out, it is noted that in the case of inclined position of an impact element on the rotor an increase in flight speed and flight angles change in crushed particles, which gives the opportunity to have a positive effect on grinding process.

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Enhancement the Solar Still Performance Using Chimney Exhaust Gases

ASME 2021 15th International Conference on Energy Sustainability ◽

10.1115/es2021-63858 ◽

2021 ◽

Author(s):

Hamdy Hassan

Keyword(s):

Mathematical Model ◽

Theoretical Study ◽

Saline Water ◽

Kutta Method ◽

Solar Still ◽

Climate Conditions ◽

Exhaust Gases ◽

Runge Kutta Method ◽

The Impact ◽

The Mathematical Model

Abstract In this paper, a theoretical study is presented on enhancement of the solar still performance by using the exhaust gases passing inside a chimney under the still basin. The impact of the exhaust gases temperature on the solar still temperature, productivity, and efficiency are considered. The performance of solar still with chimney is compared with that of conventional solar still. The study is carried out under the hot and climate conditions of Upper Egypt. A complete transient mathematical model of the physical model including the solar still regions temperatures, productivity, and heat transfer between the solar still and the exhaust gases are constructed. The mathematical model is solved numerically by using fourth-order Runge-Kutta method and is programmed by using MATLAB. The mathematical model is validated using an experimental work. The results show that the solar still saline water temperature increases and productivity with using and rising the exhaust gases. Furthermore, the impact of using exhaust gases on the still performance in winter is greater than in summer. using chimney exhaust gases at 75 °C and 125 °C enhances the daily freshwater yield of the conventional still by more than three times and about six times in winter, respectively, and about two and half times and more than three times in summer, respectively.

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The Percolation of Liquid Through a Compliant Seal—An Experimental and Theoretical Study

Journal of Fluids Engineering ◽

10.1115/1.4041120 ◽

2018 ◽

Vol 141 (3) ◽

Cited By ~ 5

Author(s):

Sorin-Cristian Vlădescu ◽

Carmine Putignano ◽

Nigel Marx ◽

Tomas Keppens ◽

Tom Reddyhoff ◽

...

Keyword(s):

Surface Energy ◽

Capillary Pressure ◽

Contact Pressure ◽

Roughness Length ◽

Theoretical Study ◽

Theoretical Explanation ◽

Channel Section ◽

Hydrophilic Surfaces ◽

New Apparatus ◽

The Impact

New apparatus is described to simulate a compliant seal interface, allowing the percolation of liquid to be viewed by a fluorescence microscope. A model, based on the boundary element (BE) methodology, is used to provide a theoretical explanation of the observed behavior. The impact of contact pressure, roughness, and surface energy on percolation rates are characterized. For hydrophilic surfaces, percolation will always occur provided a sufficient number of roughness length scales are considered. However, for hydrophobic surfaces, the inlet pressure must overcome the capillary pressure exerted at the minimum channel section before flow can occur.

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Theoretical study of the impact of ion acceleration parameters on the mass resolving power in linear MALDI time-of-flight mass spectrometry

International Journal of Mass Spectrometry ◽

10.1016/j.ijms.2021.116756 ◽

2021 ◽

pp. 116756

Author(s):

Yi-Hong Cai ◽

Cheng-Huang Lin ◽

Yi-Sheng Wang

Keyword(s):

Mass Spectrometry ◽

Theoretical Study ◽

Time Of Flight ◽

Resolving Power ◽

Ion Acceleration ◽

Flight Mass Spectrometry ◽

Mass Resolving Power ◽

The Impact

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62 Growth Performance and Mineral Status of 6 Kg Piglets Fed Reduced Levels of Dietary Calcium

Journal of Animal Science ◽

10.1093/jas/skab054.074 ◽

2021 ◽

Vol 99 (Supplement_1) ◽

pp. 42-42

Author(s):

Laura A Merriman ◽

Craig Wyatt ◽

Marie-Pierre Létourneau-Montminy ◽

Xaviere Rousseau ◽

Dan Bussières

Keyword(s):

Bone Mineral Content ◽

Growth Performance ◽

Bone Mineral ◽

Mineral Content ◽

Bone Mineralization ◽

Phase 1 ◽

Short Term ◽

Plasma Parameters ◽

Dietary Treatments ◽

The Impact

Abstract Imbalances between calcium (Ca) and phosphorus (P) impair growth performance and bone mineralization. However, reducing dietary limestone may change the buffering capacity of feed in early nursery piglets, which may help prevent post-weaning diarrhea. An experiment was conducted to evaluate the impact of reducing Ca post weaning compared to recommendations outlined by NRC (2012) or a low P diet. Dietary treatments consisted of 1) Low Ca (LCa; Phase 1, 0.51% Ca and 0.47% STTD P), 2) NRC recommendations (NRC; Phase 1, 0.85% Ca and 0.42% STTD P), and 3) a recommendation lower in phosphorus (LP; Phase 1, 0.65% Ca and 0.36% STTD P). Each diet was fed over 4 phases. Piglets (n = 953; 276/275 Fast X PIC 800 genetics) were blocked by room, sex, and initial BW (6 kg). Feed intake and pig weights were recorded weekly. At 12 d and 41 d, blood was collected and Dual-X ray (DXA) measurements were taken using 8 piglets per treatment. Fecal scores were evaluated during wk 4 and 5. Data were analyzed using MIXED procedure of SAS (SAS Inst. Inc., Cary, NC). There were no differences observed in mortality, overall growth performance, plasma Ca and P, and scour scores at either time point. At 12 d, the bone mineral content was reduced (P = 0.001) in LP pigs compared to LCa and NRC. At 41 d, bone mineral content was reduced in NRC in comparison to LCa while LP was intermediate (P = 0.001). Plasma parameters showed an increased magnesium (Mg) and Ca:Mg in LCa (P < 0.01) that can be related to bone resorption to face Ca hypocalcemia. Pigs were healthy with no enteric challenges, limiting the ability to observe a benefit in fecal scores. In conclusion, piglets can maintain growth and bone mineralization through a short-term limestone removal program.

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Conceptual Framework for Non-Algorithmic Education in STEAM Education

Metacognition and Successful Learning Strategies in Higher Education - Advances in Higher Education and Professional Development ◽

10.4018/978-1-5225-2218-8.ch010 ◽

2017 ◽

pp. 178-195

Author(s):

Marina Morari

Keyword(s):

Conceptual Framework ◽

Theoretical Study ◽

Spiritual Intelligence ◽

Knowledge Development ◽

Learning Design ◽

Methodological Research ◽

Steam Education ◽

The Impact ◽

Psychological Dimensions

This chapter is based on a theoretical study of reflexivity, as a non-algorithmic method for Science, Technology, Engineering, Art, and Mathematic (STEAM Education). It explores the key shift in artistic education, embracing the role of scientific and artistic knowledge, knowledge development as an inner experience, importance of art for spiritual intelligence, as well as the philosophical and psychological dimensions of metacognition (as thinking about thinking). The focus in this chapter is related on understanding the complexity of reflexivity and the impact of metacognition within development of the artistic competence. Finally, the methodological research provides a conceptual framework that is important for learning design of non-algorithmic education.

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Experimental and Theoretical Study on the Cooling Performance of a CO2 Mobile Air Conditioning System

Energies ◽

10.3390/en11081927 ◽

2018 ◽

Vol 11 (8) ◽

pp. 1927 ◽

Cited By ~ 4

Author(s):

Dandong Wang ◽

Binbin Yu ◽

Junye Shi ◽

Jiangping Chen

Keyword(s):

Air Conditioning ◽

Theoretical Study ◽

Cooling Capacity ◽

Air Conditioning System ◽

Cooling Performance ◽

System A ◽

Hfc 134A ◽

Expansion Valve ◽

The Impact ◽

Compressor Efficiency

CO2 (GWP = 1) is considered as a promising natural alternative refrigerant to HFC-134a in mobile air conditioning (MAC) applications. The objective of this study is to investigate the cooling performance characteristics of a CO2 MAC system. A prototype CO2 MAC system, consisting of a CO2 electrical compressor, CO2 parallel flow microchannel heat exchangers, and an electrical expansion valve, was developed and tested. Factor analysis experiments were conducted to reveal the effect of outdoor temperature on the cooling performance of this CO2 MAC system. Compared with a conventional R134a MAC system, the prototype CO2 MAC system achieved comparable cooling capacity, but had COP reductions of 26% and 10% at 27 °C and 45 °C outdoor conditions, respectively. In addition, based on refrigerant properties, theoretical cycle analysis was done to reveal the impact of evaporator, gas cooler and compressor, on the system cooling performance. It is concluded that the increase of overall compressor efficiency or the decrease of gas cooler approaching temperature could greatly improve the COP of this CO2 MAC system.

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