A critical interaction time for fast fission

1985 ◽  
Vol 43 (1) ◽  
pp. 14-18 ◽  
Author(s):  
A. Bonasera
Keyword(s):  
Interaction Time ◽  
Fast Fission

Material Structure of Microcrystalline Silicon Deposited with an Expanding Thermal Plasma

2003 ◽  
Vol 762 ◽  
Author(s):  
C. Smit ◽  
D.L. Williamson ◽  
M.C.M. van de Sanden ◽  
R.A.C.M.M. van Swaaij
Keyword(s):  
Thermal Plasma ◽  
Hydrogen Plasma ◽  
Plasma Chemistry ◽  
Plasma Source ◽  
Growth Direction ◽  
Interaction Time ◽  
Material Structure ◽  
Average Particle ◽  
Microcrystalline Silicon ◽  
X Ray

AbstractExpanding thermal plasma CVD (ETP CVD) has been used to deposit thin microcrystalline silicon films. In this study we varied the position at which the silane is injected in the expanding hydrogen plasma: relatively far from the substrate and close to the plasma source, giving a long interaction time of the plasma with the silane, and close to the substrate, resulting in a short interaction time. The material structure is studied extensively. The crystalline fractions as obtained from Raman spectroscopy as well as from X-ray diffraction (XRD) vary from 0 to 67%. The average particle sizes vary from 6 to 17 nm as estimated from the (111) XRD peak using the Scherrer formula. Small angle X-ray scattering (SAXS) and flotation density measurements indicate void volume fractions of about 4 to 6%. When the samples are tilted the SAXS signal is lower than for the untilted case, indicating elongated objects parallel to the growth direction in the films. We show that the material properties are influenced by the position of silane injection in the reactor, indicating a change in the plasma chemistry.

scholarly journals Investigation of spatial ability test completion times in virtual reality using a desktop display and the Gear VR

2021 ◽  
Author(s):  
Tibor Guzsvinecz ◽  
Éva Orbán-Mihálykó ◽  
Cecília Sik-Lányi ◽  
Erika Perge
Keyword(s):  
Virtual Reality ◽  
Mental Rotation ◽  
Spatial Ability ◽  
Interaction Time ◽  
Ability Test ◽  
Ability Tests ◽  
Hand Test ◽  
The Relationship ◽  
Completion Times ◽  
Test Completion

AbstractThe interaction time of students who did spatial ability tests in a virtual reality environment is analyzed. The spatial ability test completion times of 240 and 61 students were measured. A desktop display as well as the Gear VR were used by the former group and by the latter one, respectively. Logistic regression analysis was used to investigate the relationship between the probability of correct answers and completion times, while linear regression was used to evaluate effects and interactions of following factors on test completion times: the users’ gender and primary hand, test type and device used. The findings were that while the completion times are not significantly affected by the users’ primary hand, other factors have significant effects on them: they are decreased by the male gender in itself, while they are increased by solving Mental Rotation Tests or by using the Gear VR. The largest significant increment in interaction time in virtual reality during spatial ability tests is when Mental Rotation Tests are accomplished by males with the Gear VR, while the largest significant decrease in interaction time is when Mental Cutting Tests are completed with a desktop display.

Neutronics performance evaluation of fast-fission fuel breeding blankets for a fusion–fission hybrid reactor

2010 ◽  
Vol 85 (10-12) ◽  
pp. 2120-2124 ◽  
Author(s):  
Minghuang Wang ◽  
Jieqiong Jiang ◽  
Jinchao Liu ◽  
Yunqing Bai ◽  
Yanglin Hu
Keyword(s):  
Performance Evaluation ◽  
Hybrid Reactor ◽  
Fast Fission

Stability Analysis of Social Foraging Swarm with Interaction Time Delays

2009 ◽  
Author(s):  
Bo Liu ◽  
Yan Yu ◽  
Jie Zhang ◽  
Huan Li
Keyword(s):  
Stability Analysis ◽  
Time Delays ◽  
Interaction Time ◽  
Social Foraging

Abstract P066: A Refined Carbohydrate Diet Attenuates Weight Loss in Insulin Resistant Individuals

Circulation ◽  
2012 ◽  
Vol 125 (suppl_10) ◽  
Author(s):  
Kristina A Harris ◽  
Sheila G West ◽  
Jack P Vanden Heuvel ◽  
Penny M Kris-Etherton
Keyword(s):  
Weight Loss ◽  
Waist Circumference ◽  
Secondary Analysis ◽  
Density Lipoprotein ◽  
Whole Grains ◽  
Interaction Time ◽  
P Value ◽  
Refined Grains ◽  
Cholesterol Ratio ◽  
Insulin Resistant

Introduction: Weight loss is attenuated in individuals with insulin resistance (IR) who follow a traditional high-carbohydrate, calorie-restricted diet. However, the type of carbohydrate may modulate this response. We studied the effects of whole grains vs. refined grains on weight loss in individuals with increased waist circumference (M: >102 cm, F: >88 cm) and at least 1 other metabolic syndrome characteristic. Hypothesis: In a secondary analysis, we hypothesized that IR individuals (estimated by a triglyceride:high-density lipoprotein cholesterol ratio > 3.5) would lose more weight on a hypocaloric diet with whole grains vs. refined grains. Methods: Overweight or obese (BMI 25–42 kg/m2) men and women (n=50) 35–55 yrs were randomized to a controlled-feeding diet with whole vs. refined grains for 12 weeks [6 weeks isocaloric then 6 weeks hypocaloric (∼500 kcal/d)]. Results: [All comparisons represented as IR mean±SEM vs. insulin sensitive (IS) mean±SEM, p-value)]. Compared to the IS group (n=29), the IR group (n=21) was predominately male (14 M/7 F vs. 11M/18F, p=0.04), weighed more (107.5±3.3 vs. 93.9±3.0 kg, p=0.005), and had increased waist circumference (113±2.2 vs. 106±1.5 cm, p=0.02). IR status did not affect overall percent body weight (%BW) lost over the course of the study (−4.0±0.4 vs. −4.5±0.3 %BW; p for interaction, time x IR status = 0.34). However, IR status did affect %BW lost when the type of carbohydrate was considered (p for interaction, time x IR status x diet = 0.04; Figure ). Post-hoc analysis revealed that within the refined grain group, IR participants lost less %BW than the IS participants (−4.14±0.4 vs. −5.84±0.5 %BW, adjusted p=0.04). On the whole grains diet, %BW lost was similar in the IS and IR groups. Conclusion: In conclusion, IR individuals lost less %BW than IS individuals on the hypocaloric refined grain diet. Limiting refined grains may improve the efficacy of traditional weight loss diets in IR individuals. Figure. %BW lost in IR and IS groups on refined grain diet, *p=0.04.

scholarly journals Dynamics of Entanglement between a Quantum Dot Spin Qubit and a Photon Qubit inside a Semiconductor High-Q Nanocavity

2010 ◽  
Vol 2010 ◽  
pp. 1-31 ◽  
Author(s):  
Hubert Pascal Seigneur ◽  
Gabriel Gonzalez ◽  
Michael Niklaus Leuenberger ◽  
Winston Vaughan Schoenfeld
Keyword(s):  
Quantum Dot ◽  
Single Photon ◽  
Hyperfine Interactions ◽  
Interaction Time ◽  
Network Node ◽  
Quantum Network ◽  
Entanglement Dynamics ◽  
High Q ◽  
Spin Qubit

We investigate in this paper the dynamics of entanglement between a QD spin qubit and a single photon qubit inside a quantum network node, as well as its robustness against various decoherence processes. First, the entanglement dynamics is considered without decoherence. In the small detuning regime (Δ=78 μeV), there are three different conditions for maximum entanglement, which occur after 71, 93, and 116 picoseconds of interaction time. In the large detuning regime (Δ=1.5 meV), there is only one peak for maximum entanglement occurring at 625 picoseconds. Second, the entanglement dynamics is considered with decoherence by including the effects of spin-nucleus and hole-nucleus hyperfine interactions. In the small detuning regime, a decent amount of entanglement (35% entanglement) can only be obtained within 200 picoseconds of interaction. Afterward, all entanglement is lost. In the large detuning regime, a smaller amount of entanglement is realized, namely, 25%. And, it lasts only within the first 300 picoseconds.

The interaction time for heavy-ion fusion

1986 ◽  
Vol 92 (2) ◽  
pp. 210-216 ◽  
Author(s):  
A. Scalia
Keyword(s):  
Heavy Ion ◽  
Interaction Time ◽  
Heavy Ion Fusion

Fast Fission Assisted Ignition of Thermonuclear Microexplosions

2006 ◽  
Vol 61 (10-11) ◽  
pp. 559-563
Author(s):  
Friedwardt Winterberg
Keyword(s):  
Hot Spot ◽  
Fusion Reaction ◽  
Particle Beam ◽  
Intense Laser ◽  
Large Temperature ◽  
Nernst Effect ◽  
Fast Fission ◽  
Large Current ◽  
The Magnetic Field ◽  
Α Particles

It is shown that the requirements for fast ignition of thermonuclear microexplosions can be substantially relaxed if the deuterium-tritium (DT) hot spot is placed inside a shell of U-238 (Th-232). An intense laser - or particle beam-projected into the shell leads to a large temperature gradient between the hot DT and the cold U-238 (Th-232), driving thermomagnetic currents by the Nernst effect, with magnetic fields large enough to entrap within the hot spot the α-particles of the DT fusion reaction. The fast fission reactions in the U-238 (Th-232) shell implode about 1/2 of the shell onto the DT, increasing its density and reaction rate. With the magnetic field generated by the Nernst effect, there is no need to connect the target to a large current carrying transmission line, as it is required for magnetized target fusion, solving the so-called “stand off” problem for thermonuclear microexplosions. - PACS number: 28.52.-s.

scholarly journals TOMO AKVINIEČIO LAIKO SAMPRATA

Problemos ◽  
2009 ◽  
Vol 76 ◽  
pp. 206-224 ◽  
Author(s):  
Povilas Aleksandravičius
Keyword(s):  
Thomas Aquinas ◽  
Interaction Time ◽  
Human Soul ◽  
Time Motion ◽  
Definition Of

Straipsnyje aptariama Tomo Akviniečio laiko samprata, parodomas nuotolis tarp šios sampratos ir Aristotelio laiko suvokimo, nors abu mąstytojus formaliai vienija tas pats laiko apibrėžimas. Analizuojami pagrindiniai šio apibrėžimo elementai – laikas, judėjimas, žmogaus siela. Pereinant nuo aristoteliškos substancijų ontologijos (ovσία) į tomistiškąją buvimo akto (actus essendi) metafiziką, atskleidžiama judėjimo, žmogaus sielos ir laiko buvimo aktų vienovė. Maitinamas dieviškojo kūrimo veiksmo, laikas pasirodo kaip įtampa, kaip pati žmogaus siela, kuri, „matuodama“ ontologinį būtybės judėjimą, jo nuolatinį prasidėjimo momentą (dabartį) paverčia tęstiniu, pridėdama praeities ir ateities dimensijas.Pagrindiniai žodžiai: laikas, judėjimas, siela, intelektas, buvimo aktas, kūrimas iš nebūties.The Concept of Time According to Thomas AquinasPovilas Aleksandravičius SummaryThe article explains Thomas Aquinas’ concept of time on the basis of his metaphysics of being. At the same time, it shows the distance between his concept and the Aristotle’s conception of time, despite the fact that, formally, both thinkers used the same definition of time. The article analyzes the main elements of this definition through their interaction: time, motion and human soul. The journey from the Aristotle’s ontology of substances (υοσία) to the Thomistic metaphysics of the act of being (actus essendi) uncovers the unity among between motion, human soul and the acts of being of time. Nurtured by the act of divine creation, time appears as a tension, as the human soul itself, which ‘measures’ the ontological movement of a being and makes continuous its continual moments of beginning, by adding the dimensions of past and future.Keywords: Thomas Aquinas, time, motion, soul, intellect, act of being, creation from nothing.

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