scholarly journals Mechanistic Insights into Oxygen Dynamics in Soot Combustion over Cryptomelane Catalysts in Tight and Loose Contact Modes via 18O2/16O2 Isotopic Variable Composition Measurements – A Hot Ring Model of the Catalyst Operation

ACS Catalysis ◽  
2021 ◽  
pp. 9530-9546
Author(s):  
Joanna Gryboś ◽  
Monika Fedyna ◽  
Piotr Legutko ◽  
Bartosz Leszczyński ◽  
Janusz Janas ◽  
...  
Keyword(s):  
Variable Composition ◽  
Soot Combustion ◽  
Ring Model ◽  
Oxygen Dynamics ◽  
Composition Measurements

EFFICIENT REMOVAL OF ANIONIC DYE POLLUTANT BY NIMGAL LAYERED DOUBLE HYDROXIDES OF VARIABLE COMPOSITION

2018 ◽  
Vol 1 (4) ◽  
pp. 307-323
Author(s):  
Dipshikha Bharali ◽  
Pankaj Bharali ◽  
Ramesh Ch. Deka
Keyword(s):  
Layered Double Hydroxides ◽  
Variable Composition ◽  
Efficient Removal ◽  
Anionic Dye ◽  
Double Hydroxides

Techniques for Determining the Parameters of a Two-Dimensional Tire Model for the Study of Ride Comfort

1997 ◽  
Vol 25 (3) ◽  
pp. 187-213 ◽  
Author(s):  
F. Mancosu ◽  
G. Matrascia ◽  
F. Cheli
Keyword(s):  
Physical Properties ◽  
Ride Comfort ◽  
Dynamic Test ◽  
Longitudinal Direction ◽  
Tire Model ◽  
Rigid Ring ◽  
Ring Model ◽  
Mass Moment ◽  
A New Technique ◽  
And Performance

Abstract A rigid ring model of the tire for the study of in-plane dynamics and a new technique for determining the parameters of the model are presented in this paper. This model can be used for studying the comfort of vehicles, problems of driving, and braking problems in the longitudinal direction. Comparison with finite element models shows that the rigid ring model of the tire is capable of describing the in-plane eigenmode shapes in the frequency range of 0–130 Hz. The well-known “brush model,” integrated into the tire model, is introduced to take into account the slide phenomena in the contact patch. The parameters of the model can be correlated with the physical properties of the tire so that designers can take advantage of such a correlation in the development of new tires in terms of time, cost, and performance. The technique used to determine the parameters of the model for some automobile tires include the direct measurements of some physical properties (mass, moment of inertia, stiffness) and a method of identification applied on the results from a dynamic test. The model is able to predict experimental data in terms of natural frequencies and relative dampings. Results from the application of this technique on two tires are reported.

Tire Rolling Kinematics Model for an Intelligent Tire Based on an Accelerometer

2020 ◽  
Vol 48 (4) ◽  
pp. 287-314
Author(s):  
Yan Wang ◽  
Zhe Liu ◽  
Michael Kaliske ◽  
Yintao Wei
Keyword(s):  
Elastic Deformation ◽  
Estimation Algorithm ◽  
Force Sensor ◽  
Euler Method ◽  
Rolling Contact ◽  
Body Motion ◽  
Identification Algorithm ◽  
Active Perception ◽  
Kinematics Model ◽  
Ring Model

ABSTRACT The idea of intelligent tires is to develop a tire into an active perception component or a force sensor with an embedded microsensor, such as an accelerometer. A tire rolling kinematics model is necessary to link the acceleration measured with the tire body elastic deformation, based on which the tire forces can be identified. Although intelligent tires have attracted wide interest in recent years, a theoretical model for the rolling kinematics of acceleration fields is still lacking. Therefore, this paper focuses on an explicit formulation for the tire rolling kinematics of acceleration, thereby providing a foundation for the force identification algorithms for an accelerometer-based intelligent tire. The Lagrange–Euler method is used to describe the acceleration field and contact deformation of rolling contact structures. Then, the three-axis acceleration vectors can be expressed by coupling rigid body motion and elastic deformation. To obtain an analytical expression of the full tire deformation, a three-dimensional tire ring model is solved with the tire–road deformation as boundary conditions. After parameterizing the ring model for a radial tire, the developed method is applied and validated by comparing the calculated three-axis accelerations with those measured by the accelerometer. Based on the features of acceleration, especially the distinct peak values corresponding to the tire leading and trailing edges, an intelligent tire identification algorithm is established to predict the tire–road contact length and tire vertical load. A simulation and experiments are conducted to verify the accuracy of the estimation algorithm, the results of which demonstrate good agreement. The proposed model provides a solid theoretical foundation for an acceleration-based intelligent tire.

Analysis of the Contact Deformation of a Radial Tire with Camber Angle

1995 ◽  
Vol 23 (1) ◽  
pp. 26-51 ◽  
Author(s):  
S. Kagami ◽  
T. Akasaka ◽  
H. Shiobara ◽  
A. Hasegawa
Keyword(s):  
Pressure Distribution ◽  
Contact Pressure ◽  
Contact Region ◽  
Contact Deformation ◽  
Contact Pressure Distribution ◽  
Radial Tire ◽  
Ring Model ◽  
Camber Angle ◽  
Contact Free ◽  
Good Agreement

Abstract The contact deformation of a radial tire with a camber angle, has been an important problem closely related to the cornering characteristics of radial tires. The analysis of this problem has been considered to be so difficult mathematically in describing the asymmetric deformation of a radial tire contacting with the roadway, that few papers have been published. In this paper, we present an analytical approach to this problem by using a spring bedded ring model consisting of sidewall spring systems in the radial, the lateral, and the circumferential directions and a spring bed of the tread rubber, together with a ring strip of the composite belt. Analytical solutions for each belt deformation in the contact and the contact-free regions are connected by appropriate boundary conditions at both ends. Galerkin's method is used for solving the additional deflection function defined in the contact region. This function plays an important role in determining the contact pressure distribution. Numerical calculations and experiments are conducted for a radial tire of 175SR14. Good agreement between the predicted and the measured results was obtained for two dimensional contact pressure distribution and the camber thrust characterized by the camber angle.

Copper–oxygen Dynamics in Tyrosinase

2019 ◽  
Author(s):  
Nobutaka Fujieda ◽  
Sachiko Yanagisawa ◽  
Minoru Kubo ◽  
Genji Kurisu ◽  
Shinobu Itoh
Keyword(s):  
Catalytic Mechanism ◽  
Substrate Binding ◽  
Active Form ◽  
Copper Ion ◽  
Atomic Resolution ◽  
Oxygen Species ◽  
X Ray ◽  
Oxygen Dynamics ◽  
Insight Into ◽  
Copper Centre

To unveil the activation of dioxygen on the copper centre (Cu<sub>2</sub>O<sub>2</sub>core) of tyrosinase, we performed X-ray crystallograpy with active-form tyrosinase at near atomic resolution. This study provided a novel insight into the catalytic mechanism of the tyrosinase, including the rearrangement of copper-oxygen species as well as the intramolecular migration of copper ion induced by substrate-binding.<br>

К ПРОБЛЕМЕ ПЕРЕВОСПИТАНИЯ ВОЕННОСЛУЖАЩИХ В ДИСЦИПЛИНАРНЫХ ВОИНСКИХ ЧАСТЯХ РОССИЙСКОЙ ИМПЕРИИ

2020 ◽  
Author(s):  
Vitaliy Voronov ◽  
Timur Slivin
Keyword(s):  
Law Enforcement ◽  
Military Personnel ◽  
Russian Empire ◽  
Variable Composition ◽  
Negative Aspect ◽  
Actual Problem ◽  
Military Organization ◽  
Moral Influence ◽  
The Russian Empire ◽  
The Military

В статье рассмотрена актуальная проблема перевоспитания военнослужащих в дисциплинарных частях в Российской империи как организованного и структурированного процесса. Изучено использование их потенциала для поддержания дисциплины и правопорядка среди личного состава. Определено, что к военнослужащим предусмотрено применение специальных видов уголовных наказаний, кроме того, допускается изъятие в применении отдельных наказаний к данной категории лиц. Авторами раскрывается порядок реализации наказания в виде лишения свободы в частях с воинской организацией в отношении военнослужащих, совершивших преступления. Указывается на то, что перевоспитание осужденных военнослужащих было направлено на повышение уровня их военной и строевой подготовки, принуждение их к выполнению требований военной присяги и воинских уставов. В качестве негативного момента перевоспитания осужденных военнослужащих указывается отсутствие специальной подготовки у штатных офицеров и нижних чинов дисциплинарных частей. В статье рассматривается порядок реализации наказания в виде лишения свободы в арестантских частях, а также дисциплинарных частях. Раскрыто понятие арестантских рот, их руководящий и личный состав, а также порядок содержания осужденных. Показаны особенности комплектования дисциплинарных частей как постоянным составом, так и переменным (осужденными), а также прохождения ими службы. Авторами отмечается, что в перевоспитании осужденных военнослужащих превалировала принудительная функция в ущерб нравственному воздействию. Авторы приходят к выводу о том, что дисциплинарные и штрафные части со строевой организацией в целом справляются с задачей перевоспитания осужденных военнослужащих, а опыт функционирования дисциплинарных частей царской армии был использован при создании военно-карательного аппарата Советской армии.The article deals with the actual problem of re-education of military personnel in disciplinary units in the Russian Empire as an organized and structured process. The use of their potential for maintaining discipline and law enforcement among personnel was studied. It is determined that the use of special types of criminal penalties is provided for military personnel, in addition, exceptions are allowed in the application of certain penalties to this category of persons. The author reveals the order of realization of punishment in the form of imprisonment in re-lations with the military organization in relation to the military personnel who have committed crimes. It is pointed out that the re-education of convicted servicemen was aimed at increasing the level of their military and drill training, forcing them to fulfill the requirements of the military oath and military regulations. As a negative aspect of the re-education of convicted servicemen, the lack of special training of regular officers and lower ranks of disciplinary units is indicated. The article deals with the procedure for the implementation of punishment in the form of im-prisonment in prison units, as well as disciplinary units. The concept of convict companies, their leadership and personnel, as well as the order of detention of convicts is revealed. The peculiarities of completing disciplinary units with both permanent and variable composition (convicts), as well as their service are shown. The author notes that in the re-education of convicted servicemen, forced functioning prevailed to the detriment of moral influence. The author comes to the conclusion that disciplinary and penal units with drill organization in General cope with the task of re-education of convicted servicemen, and the experience of functioning of disciplinary units of the tsarist army was used in the creation of the military punitive apparatus of the Soviet army.

Rat Aortic Ring Model to Assay Angiogenesis ex vivo

BIO-PROTOCOL ◽  
2015 ◽  
Vol 5 (20) ◽  
Author(s):  
Isabelle Ernens ◽  
B�n�dicte Lenoir ◽  
Yvan Devaux ◽  
Daniel Wagner
Keyword(s):  
Ex Vivo ◽  
Aortic Ring ◽  
Ring Model ◽  
Rat Aortic Ring Model

scholarly journals Quadrupole Ion Trap Mass Spectrometer for Ice Giant Atmospheres Exploration

2021 ◽  
Vol 217 (1) ◽  
Author(s):  
J. Simcic ◽  
D. Nikolić ◽  
A. Belousov ◽  
D. Atkinson ◽  
C. Lee ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Ion Trap ◽  
Quadrupole Ion Trap ◽  
Atomic Mass ◽  
Charge Ratio ◽  
Inlet System ◽  
Mass Spectrometers ◽  
Ion Trap Mass Spectrometer ◽  
Entry Probe ◽  
Composition Measurements

AbstractTo date, a variety of different types of mass spectrometers have been utilized on missions to study the composition of atmospheres of solar system bodies, including Venus, Mars, Jupiter, Titan, the moon, and several comets. With the increasing interest in future small probe missions, mass spectrometers need to become even more versatile, lightweight, compact, and sensitive.For in situ exploration of ice giant atmospheres, the highest priority composition measurements are helium and the other noble gases, noble gas isotopes, including 3He/4He, and other key isotopes like D/H. Other important but lower priority composition measurements include abundances of volatiles C, N, S, and P; isotopes 13C/12C, 15N/14N, 18O/17O/16O; and disequilibrium species PH3, CO, AsH3, GeH4, and SiH4. Required measurement accuracies are largely defined by the accuracies achieved by the Galileo (Jupiter) probe Neutral Mass Spectrometer and Helium Abundance Detectors, and current measurement accuracies of solar abundances.An inherent challenge of planetary entry probe mass spectrometers is the introduction of material to be sampled (gas, solid, or liquid) into the instrument interior, which operates at a vacuum level. Atmospheric entry probe mass spectrometers typically require a specially designed sample inlet system, which ideally provides highly choked, nearly constant mass-flow intake over a large range of ambient pressures. An ice giant descent probe would have to operate for 1-2 hours over a range of atmospheric pressures, possibly covering 2 or more orders of magnitude, from the tropopause near 100 mbar to at least 10 bars, in an atmospheric layer of depth beneath the tropopause of about 120 km at Neptune and about 150 km at Uranus.The Jet Propulsion Laboratory’s Quadrupole Ion Trap Mass Spectrometer (QITMS) is being developed to achieve all of these requirements. A compact, wireless instrument with a mass of only 7.5 kg, and a volume of 7 liters (7U), the JPL QITMS is currently the smallest flight mass spectrometer available for possible use on planetary descent probes as well as small bodies, including comet landers and surface sample return missions. The QITMS is capable of making measurements of all required constituents in the mass range of 1–600 atomic mass units (u) at a typical speed of 50 mass spectra per second, with a sensitivity of up to $10^{13}$ 10 13  counts/mbar/sec and mass resolution of $m/\Delta m=18000$ m / Δ m = 18000 at m/q = 40. (Throughout this paper we use the unit of m/q = u/e for the mass-to-charge ratio, where atomic mass unit and elementary charge are $1~\text{u} = 1.66\times 10^{-27}~\text{kg}$ 1 u = 1.66 × 10 − 27 kg and $1\text{e} = 1.6\times 10^{-19}$ 1 e = 1.6 × 10 − 19 C, respectively.) The QITMS features a novel MEMS-based inlet system driven by a piezoelectric actuator that continuously regulates gas flow at inlet pressures of up to 100 bar.In this paper, we present an overview of the QITMS capabilities, including instrument design and characteristics of the inlet system, as well as the most recent results from laboratory measurements in different modes of operation, especially suitable for ice giant atmospheres exploration.

PrOx nanoparticles: active and stable catalysts for soot combustion

2021 ◽  
pp. 150183
Author(s):  
Begoña Sellers-Antón ◽  
Esther Bailón-García ◽  
Arantxa Davó-Quiñonero ◽  
Dolores Lozano-Castelló ◽  
Agustín Bueno-López
Keyword(s):  
Soot Combustion
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