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排序方式: 共有294条查询结果,搜索用时 15 毫秒
1.
2.
This article proposes an approach for investigating the exponential stability of a nonlinear
interval dynamical system with the nonlinearity of a quadratic type on the basis of the Lyapunov’s direct method. It also
constructs an inner estimate of the attraction domain to the origin for the system under consideration. 相似文献
3.
Anatoly M. Dolgonosov Ruslan Kh. Khamizov Anna N. Krachak Andrei G. Prudkovsky 《Reactive and Functional Polymers》1995,28(1)
A model for multispecies ion-exchange kinetics based on the Nernst-Planck equation is suggested. It is analyzed in comparison with the “locally-determinate” model described by Hwang and Helfferich [1]. The model makes possible simple computation. The conditions for the occurrence of unusual kinetic curves with a maximum are clarified. The proposed model is developed for different types of kinetic problems and verified by the experimental investigation of a kinetics in ternary systems. 相似文献
4.
Conclusions -- The supermolecular structure of spinning solutions from viscose manufacturing operations in the Balakovskii Khimvolokno PO has been studied by the turbidity spectrum method.-- Multiple and paired correlation equations have been obtained for the parameters of viscose supermolecular structure and the characteristics of the cellulose and the physicomechanical characteristics of hydrocellulose fibres and films.Translated from Khimicheskie Volokna, No. 5, pp. 42–45, September–October, 1991. 相似文献
5.
Svetlana V. Klinova Boris A. Katsnelson Ilzira A. Minigalieva Oksana P. Gerzen Alexander A. Balakin Ruslan V. Lisin Ksenia A. Butova Salavat R. Nabiev Oleg N. Lookin Leonid B. Katsnelson Larisa I. Privalova Daniil A. Kuznetsov Vladimir Ya. Shur Ekaterina V. Shishkina Oleg H. Makeev Irene E. Valamina Vladimir G. Panov Marina P. Sutunkova Larisa V. Nikitina Yuri L. Protsenko 《International journal of molecular sciences》2021,22(7)
Subchronic intoxication was induced in outbred male rats by repeated intraperitoneal injections with lead oxide (PbO) and/or cadmium oxide (CdO) nanoparticles (NPs) 3 times a week during 6 weeks for the purpose of examining its effects on the contractile characteristics of isolated right ventricle trabeculae and papillary muscles in isometric and afterload contractions. Isolated and combined intoxication with these NPs was observed to reduce the mechanical work produced by both types of myocardial preparation. Using the in vitro motility assay, we showed that the sliding velocity of regulated thin filaments drops under both isolated and combined intoxication with CdO–NP and PbO–NP. These results correlate with a shift in the expression of myosin heavy chain (MHC) isoforms towards slowly cycling β–MHC. The type of CdO–NP + PbO–NP combined cardiotoxicity depends on the effect of the toxic impact, the extent of this effect, the ratio of toxicant doses, and the degree of stretching of cardiomyocytes and muscle type studied. Some indices of combined Pb–NP and CdO–NP cardiotoxicity and general toxicity (genotoxicity included) became fully or partly normalized if intoxication developed against background administration of a bioprotective complex. 相似文献
6.
7.
8.
Terry C. Lowe Ruslan Z. Valiev 《JOM Journal of the Minerals, Metals and Materials Society》2004,56(10):64-68
Severe plastic deformation (SPD) has emerged as a promising method to produce ultrafine-grained materials with attractive
properties. Today, SPD techniques are rapidly developing and are on the verge of moving from lab-scale research into commercial
production. This paper discusses new trends in the development of SPD techniques suchas high-pressure torsion and equal-channel
angle pressing, as well as new alternative techniques for introducing SPD. The paper also contains a comparative analysis
of SPD techniques in terms of their relative capabilities for grain refinement, enhancement of properties, and potential to
economically produce ultrafine-grained metals and alloys.
For more information, contact Terry C. Lowe, Science and Technology Base Programs, Los Alamos National Laboratory, Los Alamos,
NM 87545; (505) 667-7824; fax (505) 665-3199; e-mail tlowe@lanl.gov. 相似文献
9.
E. N. Prozorov 《Journal of Engineering Physics and Thermophysics》1980,39(1):721-726
A theory of mass transfer in capillary-porous bodies is proposed which allows for thermogradient transfer of a bound substance in liquid form. The results obtained are used to calculate the process of drying of ceramic articles in a fluidized bed.Notation t, T
temperature
- am
coefficient of moisture conductivity
-
, ,
density, viscosity, and surface tension of liquid
- h
thickness of liquid film
- n
disjoining pressure
- A
Hamaker constant
-
coefficient of external mass exchange
-
1
coefficient of heat transfer
-
coefficient of thermal conductivity
- Fo
Fourier number
-
volumetric moisture content of porous body
- Ws
surface moisture content of body
- n=n1+n2
porosity
- r
pore radius in the particles
- F= F1+ F2
surface area of porous body
- R1, R2
radii of wide and narrow capillaries
-
moisture content
- xo, xoe
coordinates of menisci in wide capillaries and at end of first stage, respectively
- Po, Poe
Pressures at surface of body and at end of first stage, respectively
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 39, No. 1, pp. 11–18, July, 1980. 相似文献
10.
Yu. A. Buevich V. N. Varygin E. N. Prozorov 《Journal of Engineering Physics and Thermophysics》1981,40(3):284-288
Results are presented from a theoretical determination of coefficients of mass transfer between a fluidized bed of porous particles and a capillary-porous body.Notation
a
particle radius
- F
area of contact of particles with the surface of the body
- f
percentage of area of surface of product in contact with the bubble phase
- g
acceleration due to gravity
- i
flow of liquid mass from a unit area of the surface
- N
number of fluidizations
- n
number of particles coming into contact with a surface of unit area per unit of time
- pp, pb
capillary potentials of particles and product
- R2, R1
radii of narrow and broad pores inside the product
- r
radius of capillaries in the particles
- S
area of the surface being treated
- T
temperature of the bed
-
t
time of treatment
- u
percentage content of liquid in the specimen
- V
volume of the product being treated
- v
mean square component of the fluctuation velocity of the particles in the direction normal to the surface
-
, *
standard and corrected mass-transfer coefficients determined from (5) and (9)
- b, b, p
porosities of product determined for all and for only the small pores and the porosity of the material of the particles
- d, m
porosity of the dense phase and the porosity of the bed in the state of minimum fluidization
-
b,
p
angles of wetting of the materials of the product and particles, respectively, by the liquid binder
-
,
viscosity and density of the liquid
-
0
density of the dry product
-
surface tension coefficient of the liquid
-
characteristic time of contact of particles with the surface
- Rem
Reynolds number corresponding to particle radius and minimum-bed-fluidization velocity [6]
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 40, No. 3, pp. 460–465, March, 1981. 相似文献