scholarly journals Experimental observations of fluidized beds at high temperatures

2016 ◽  
Vol 1 (1) ◽  
pp. 9 ◽  
Author(s):  
Paola Lettieri ◽  
David Newton ◽  
John G. Yates
Keyword(s):  
High Temperatures ◽  
Dominant Role ◽  
Effect Of Temperature ◽  
Interparticle Forces ◽  
Collapse Time ◽  
Experimental Values ◽  
Increasing Temperature ◽  
Fcc Catalysts

<p>The objective of this paper is to report some experimental observations on the effect of temperature on the fluidization of three fresh FCC catalysts and an equilibrium (E-cat) FCC. The bed collapse test was used as a quantitative test to characterise the <em>fluidization quality </em>of these materials with increasing temperatures. It provides a sensitive and discriminating means of assessing the changes in the materials’ responses between low and high temperature fluidization. The standardised collapse time, SCT, was calculated from the collapse profiles and the experimental values obtained for the FCC catalysts are reported in this paper. The fluidization quality of the fresh FCC catalysts improved with increasing temperature, as indicated by the increase in SCT values. On the other hand, the standardised collapse time of the E-cat FCC decreased with increasing temperature as the catalyst became less aeratable. Changes of the surface properties of this material occurred on increasing temperature. The flow behaviour of the E-cat catalyst was compared with fluidization of a Group C material. The aeratability of this latter material decreased exponentially, due to the dominant role of the interparticle forces over the hydrodynamic forces, with increasing temperature. The use of classical concepts such as the non bubbling ratio, u<sub>mb</sub>/u<sub>mf</sub>, to describe fluidization at low and high temperatures is discussed. Experimental u<sub>mb</sub>/u<sub>mf </sub>values obtained for the fresh FCC catalysts are compared with predictions.</p>

scholarly journals KESIAPAN IBU DALAM PERANNYA SEBAGAI PENDIDIK ANAK UNTUK MEMPERSIAPKAN MASA DEPAN BANGSA

2020 ◽  
Vol 4 (2) ◽  
pp. 251-266
Author(s):  
Noer Aziza
Keyword(s):  
Family Environment ◽  
Dominant Role ◽  
Future Generations ◽  
Children's Education ◽  
The Family ◽  
The Future ◽  
Children’S Education

The role of mothers in the family environment plays a quite dominant role in terms of children's education that makes a mother hold high responsibility in the progress of a nation. Therefore, a mother is required to have high self-quality to be able to educate future generations. But in reality in Indonesia there are still many quality mothers who still do not meet the needs and eligibility as a teacher in a household. For this reason, this study wants to find the level of quality of children's education from the role of a mother by conducting a study of the data obtained and found solutions to improve the quality of the mother. The results of this study indicate that with some actions will provide a positive thing for the quality and role of mothers in realizing the future of the nation through the future of a child as the successor generation of his nation.

Crystal defects responsible for mechanical behaviors of a WC–Co composite at room and high temperatures – a simulation study

2019 ◽  
Vol 75 (2) ◽  
pp. 134-142 ◽  
Author(s):  
Jing Fang ◽  
Xuemei Liu ◽  
Hao Lu ◽  
Xingwei Liu ◽  
Xiaoyan Song
Keyword(s):  
Plastic Deformation ◽  
Grain Boundaries ◽  
High Temperatures ◽  
Boundary Migration ◽  
Strain Curve ◽  
Crystal Defects ◽  
Effect Of Temperature ◽  
Triple Junctions ◽  
Deformation Processes ◽  
Increasing Temperature

The microstructure evolution and changes in the structures of crystal defects of the nanocrystalline WC–Co composite in the process of uniaxial compression were studied by simulations at both room and high temperatures. The deformation processes were demonstrated as a function of stress and temperature for the stages prior to and after yielding of the composite. The Peierls stresses were evaluated for Co and WC dislocations with increasing temperature. The deformation mechanisms for each stage of the stress–strain curve were disclosed, in which the effect of temperature was clarified. It was found that with the increase of stress, from elastic deformation to plastic deformation then to yielding of the composite, the dominant mechanisms are grain boundary migration, formation and motion of dislocations in Co, concurrent motion and reaction of dislocations in Co and WC, and then rotation of WC grains in combination with motion of Co and WC dislocations. At the yielding stage, sliding of WC grain boundaries plays an increasingly important role in the contribution to plastic deformation at high temperatures. With strain the proportion of mobile dislocations decreases, and dislocations pile up at triple junctions of WC grains, WC/WC grain boundaries and WC/Co phase boundaries in priority order, leading to the nucleation and propagation of microcracks in these regions.

Role of natural day-length and temperature in determination of summer and winter diapause in Pieris melete (Lepidoptera: Pieridae)

2011 ◽  
Vol 102 (3) ◽  
pp. 267-273 ◽  
Author(s):  
H.J. Xiao ◽  
S.H. Wu ◽  
H.M. He ◽  
C. Chen ◽  
F.S. Xue
Keyword(s):  
Adaptive Significance ◽  
Field Conditions ◽  
Day Length ◽  
Effect Of Temperature ◽  
Path Coefficient ◽  
Path Coefficient Analysis ◽  
Summer Diapause ◽  
Increasing Temperature

AbstractUnder field conditions, the cabbage butterfly, Pieris melete, displays a pupal summer diapause in response to relatively low daily temperatures and gradually increasing day-length during spring and a pupal winter diapause in response to the progressively shorter day-length. To determine whether photoperiod is ‘more’ important than temperature in the determination of summer and winter diapause, or vice versa, the effects of naturally changing day-length and temperature on the initiation of summer and winter diapause were systematically investigated under field conditions for five successive years. Field results showed that the incidence of summer diapause significantly declined with the naturally increasing temperature in spring and summer generations. Path coefficient analysis showed that the effect of temperature was much greater than photoperiod in the determination of summer diapause. In autumn, the incidence of diapause was extremely low when larvae developed under gradually shortening day-length and high temperatures. The incidence of winter diapause increased to 60–90% or higher with gradually shortening day-length combined with temperatures between 20.0°C and 22.0°C. Decreasing day-length played a more important role in the determination of winter diapause induction than temperature. The eco-adaptive significance of changing day-length and temperature in the determination of summer and winter diapause was discussed.

scholarly journals PENGARUH SUHU, WAKTU, DAN KADAR AIR PADA PIROLISIS PELEPAH KELAPA SAWIT

2017 ◽  
Vol 6 (2) ◽  
pp. 14-18
Author(s):  
Frist Silia ◽  
Seri Maulina
Keyword(s):  
Processing Time ◽  
Pyrolysis Temperature ◽  
Ph Value ◽  
Gas Production ◽  
Effect Of Temperature ◽  
Pyrolysis Process ◽  
Liquid Smoke ◽  
Yield And Quality ◽  
Increasing Temperature

Palm plantations in Indonesia began to grow rapidly since the early 80s. The area of ​​Indonesia's oil palm in 2013 was 10.4 million ha and increased 4.69% annually.  The production of palm midrib was about 22 midribs per tree per year with the weight of midrib meat ranging from 2.2 kg. The palm midrib is composed of cellulose, hemicellulose, and lignin, which can be used as liquid smoke. The purpose of this study was to analyze the effect of temperature and time of pyrolysis on the yield and quality of liquid smoke produced. The pyrolysis process of fractured palm was performed at 150 ºC, 200 ºC, and 250 ºC for 30 minutes, 60 minutes, 90 minutes. The results indicated that the yield of liquid smoke tends to decrease with increasing pyrolysis temperature, and tends to increase with increasing pyrolysis time in which the difficult condensed gas production increases with increasing temperature and time of pyrolysis. The highest yield of liquid smoke pyrolysis temperature of 150 OC with pyrolysis time 120 minutes that is equal to 43.47%. In this study, obtained the best results for a pH value of 3.1 is done at process temperatures of 250 ° C with processing time 60 minutes

Negative emotions and quality of life six months after cardiac surgery: the dominant role of depression not anxiety symptoms

2009 ◽  
Vol 32 (6) ◽  
pp. 510-522 ◽  
Author(s):  
Phillip J. Tully ◽  
Robert A. Baker ◽  
Deborah A. Turnbull ◽  
Helen R. Winefield ◽  
John L. Knight
Keyword(s):  
Quality Of Life ◽  
Cardiac Surgery ◽  
Dominant Role ◽  
Negative Emotions ◽  
Anxiety Symptoms

scholarly journals Dominant Role of the Gut Microbiota in Chemotherapy Induced Neuropathic Pain

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Chandran Ramakrishna ◽  
Jose Corleto ◽  
Paul M. Ruegger ◽  
Geoffrey D. Logan ◽  
Beth B. Peacock ◽  
...  
Keyword(s):  
Gut Microbiota ◽  
Patient Outcomes ◽  
Brain Function ◽  
Pain Sensitivity ◽  
Dominant Role ◽  
Systemic Exposure ◽  
Cancer Treatments ◽  
Toxic Side Effect

AbstractChemotherapy induced peripheral neuropathy (CIPN), a toxic side effect of some cancer treatments, negatively impacts patient outcomes and drastically reduces survivor’s quality of life (QOL). Uncovering the mechanisms driving chemotherapy-induced CIPN is urgently needed to facilitate the development of effective treatments, as currently there are none. Observing that C57BL/6 (B6) and 129SvEv (129) mice are respectively sensitive and resistant to Paclitaxel-induced pain, we investigated the involvement of the gut microbiota in this extreme phenotypic response. Reciprocal gut microbiota transfers between B6 and 129 mice as well as antibiotic depletion causally linked gut microbes to Paclitaxel-induced pain sensitivity and resistance. Microglia proliferated in the spinal cords of Paclitaxel treated mice harboring the pain-sensitive B6 microbiota but not the pain-resistant 129 microbiota, which exhibited a notable absence of infiltrating immune cells. Paclitaxel decreased the abundance of Akkermansia muciniphila, which could compromise barrier integrity resulting in systemic exposure to bacterial metabolites and products – that acting via the gut-immune-brain axis – could result in altered brain function. Other bacterial taxa that consistently associated with both bacteria and pain as well as microglia and pain were identified, lending support to our hypothesis that microglia are causally involved in CIPN, and that gut bacteria are drivers of this phenotype.

Effect of temperature on the nonlinear dynamic behavior of two-lobe non-circular gas-lubricated micro-bearings

2021 ◽  
pp. 135065012199568
Author(s):  
Azizmohammad Gharanjik ◽  
Ardeshir Karami Mohammadi
Keyword(s):  
Dynamic Behavior ◽  
High Temperatures ◽  
Nonlinear Dynamic ◽  
Phase Portraits ◽  
Effect Of Temperature ◽  
Behavior Changes ◽  
Runge Kutta Method ◽  
Nonlinear Dynamic Behavior ◽  
Effects Of Temperature ◽  
Increasing Temperature

In this paper, the molecular gas lubrication model was used to analyze the nonlinear dynamic behavior of two-lobe non-circular gas-lubricated micro-bearings. The effects of temperature rise are taken into account. At high temperatures, in addition to gas rarefaction, its viscosity and friction will also change, and slip across boundaries will occur. The rarefaction of the lubricating gas film caused by the microscale effect at high temperatures was considered. The effects of temperature and rotation speed (with and without rarefaction effect) on the dynamic behavior of the non-circular micro gas bearing were studied. The nonlinear equation governing the gas behavior is discretized using the finite-element method and then solved simultaneously with the dynamic equations of rotor motion using the fourth-order Runge–Kutta method. Center orbit diagrams, phase portraits, Poincare maps, power spectrum, and bifurcation diagrams are used to investigate the dynamic behavior of two-lobe non-circular gas-lubricated micro-bearings. Some results show that with increasing temperature, the rotor behavior changes from T-periodic to quasi-periodic. It was also observed that at high temperatures, with increasing rotational speed, the behavior of the system changes from T-periodic to quasi-periodic, but if the gas is rarefied, this change occurs at a slower speed.

Partisan Predispositions and Public Support for Making It Easier to Vote

2018 ◽  
Vol 46 (6) ◽  
pp. 971-995 ◽  
Author(s):  
Shaun Bowler ◽  
Todd Donovan
Keyword(s):  
Public Opinion ◽  
Dominant Role ◽  
Public Support ◽  
State Level ◽  
Individual Level ◽  
Low Visibility ◽  
Elite Level ◽  
Rules Changes

Public opinion on high-visibility election rules can be expected to reflect elite-level party divisions. We explain how partisanship affects support for, and opposition to, low-visibility convenience voting reforms. We find state-level factors such as quality of polling-place voting and party polarization explain some variance in support. However, individual-level factors are paramount. Attitudes about election reforms are strongly conditioned by partisan predispositions, with Democrats more supportive and Republicans more opposed. In addition, we find younger people, those with lower incomes, nonvoters, and people with disabilities were more likely to support proposals that might make voting easier. Although this cannot demonstrate that increased convenience voting would alter the composition of the electorate, it shows that, above and beyond partisanship, people who faced greater barriers to voting were most supportive of making voting easier. However, the dominant role of partisan predispositions suggests limits to rules changes that might make voting easier.

scholarly journals Sosialisasi Ilmu Statistik dalam Penelitian Bagi Mahasiswa Di Kota Palembang

2022 ◽  
Vol 5 (1) ◽  
pp. 7-12
Author(s):  
Muhammad Bahrul Ulum ◽  
Ayu Geby Gisela Syaputri
Keyword(s):  
Quantitative Research ◽  
Positive Impact ◽  
Dominant Role ◽  
Poor Quality ◽  
State Universities ◽  
Writing Research ◽  
Questions And Answers ◽  
The City

Abstract: Statistics and research are two things that cannot be separated. Although there are types of research that do not require the dominant role of statistics (qualitative research), but to be able to produce conclusions that can be generalized to a wider population, statistics is needed. Such research is quantitative research with a positivistic paradigm, ie a phenomenon is real if it can be seen, measured, and classified. The application of statistical science which is generally needed by students in writing research such as theses and theses, will have a positive impact, especially in improving the quality of the research. To achieve this goal, it is necessary to conduct socialization to students. The socialization was carried out to several students from both state universities and private universities in the city of Palembang. The socialization was done by introducing and giving tutorials on how to use statistical applications such as SPSS and Eviews, because several lecturers at several universities in Palembang complained about the poor quality of research and some said that their students did not really understand how to use SPSS and Eviews. The first result of this service is that students' understanding of SPSS and Eviews can be seen from discussions and questions and answers, second, namely the ability of students to apply the use of SPSS and Eviews in research.Keywords: research; socialization; statisticsAbstrak: Statistik dan penelitian merupakan dua hal yang tidak bisa dipisahkan. Meskipun ada jenis penelitian yang tidak membutuhkan peranan statistika yang dominan (penelitian kualitatif), namun untuk dapat menghasilkan kesimpulan yang dapat digeneralisasikan ke populasi yang lebih luas diperlukan ilmu statistika. Penelitian yang demikian adalah penelitian kuantitatif dengan paradigma yang positivistik, yakni suatu gejala itu adalah nyata jika bisa dilihat, diukur, dan diklasifikasikan. Penerapan ilmu statistik yang umumnya dibutuhkan mahasiswa dalam penulisan penelitian seperti skripsi dan tesis, akan berdampak positif terutama dalam meningkatan kualitas penelitian tersebut. Untuk mencapai tujuan tersebut maka perlu diadakan sosialisasi kepada mahasiswa. Sosialisasi dilakukan pada beberapa mahasiswa baik dari perguruan tinggi negeri maupun perguruan tinggi swasta di Kota Palembang. Sosialisasi dilakukan dengan cara mengenalkan dan memberikan tutorial bagaimana penggunaan aplikasi statistic seperti, SPSS dan Eviews, karena beberapa dosen di beberapa universitas di Palembang mengeluhkan buruknya kualitas penelitian dan ada juga yang mengatakan bahwa mahasiswa mereka tidak begitu mengerti cara penggunaan SPSS dan Eviews. Hasil dari pengabdian ini yang pertama adalah pemahaman mahasiswa mengenai SPSS dan Eviews dapat dilihat dari diskusi dan tanya jawab, kedua yaitu kemampuan mahasiswa dalam menerapkan penggunaan SPSS dan Eviews dalam penelitian.Kata Kunci: penelitian; sosialisasi; statistik

scholarly journals Temperature transcends partner specificity in the symbiosis establishment of a cnidarian

2020 ◽  
Vol 15 (1) ◽  
pp. 141-153 ◽  
Author(s):  
Marcela Herrera ◽  
Shannon G. Klein ◽  
Sara Campana ◽  
Jit Ern Chen ◽  
Arun Prasanna ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Red Sea ◽  
Photochemical Efficiency ◽  
Thermal Conditions ◽  
Effect Of Temperature ◽  
Host Genotype ◽  
Psii Photochemical Efficiency ◽  
And Performance ◽  
Increasing Temperature

AbstractCoral reef research has predominantly focused on the effect of temperature on the breakdown of coral-dinoflagellate symbioses. However, less is known about how increasing temperature affects the establishment of new coral-dinoflagellate associations. Inter-partner specificity and environment-dependent colonization are two constraints proposed to limit the acquisition of more heat tolerant symbionts. Here, we investigated the symbiotic dynamics of various photosymbionts in different host genotypes under “optimal” and elevated temperature conditions. To do this, we inoculated symbiont-free polyps of the sea anemone Exaiptasia pallida originating from Hawaii (H2), North Carolina (CC7), and the Red Sea (RS) with the same mixture of native symbiont strains (Breviolum minutum, Symbiodinium linucheae, S. microadriaticum, and a Breviolum type from the Red Sea) at 25 and 32 °C, and assessed their ITS2 composition, colonization rates, and PSII photochemical efficiency (Fv/Fm). Symbiont communities across thermal conditions differed significantly for all hosts, suggesting that temperature rather than partner specificity had a stronger effect on symbiosis establishment. Overall, we detected higher abundances of more heat resistant Symbiodiniaceae types in the 32 °C treatments. Our data further showed that PSII photophysiology under elevated temperature improved with thermal pre-exposure (i.e., higher Fv/Fm), yet, this effect depended on host genotype and was influenced by active feeding as photochemical efficiency dropped in response to food deprivation. These findings highlight the role of temperature and partner fidelity in the establishment and performance of symbiosis and demonstrate the importance of heterotrophy for symbiotic cnidarians to endure and recover from stress.

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