scholarly journals Determination methodology of the subsidence speed of small-dispersed particles of different ranges of storage facilities by visual recording

2019 ◽  
Vol 126 ◽  
pp. 00072
Author(s):  
Valeriy Azarov ◽  
Daniil Dobrinskiy ◽  
Vladislav Lupinogin ◽  
Anastasia Sakharova
Keyword(s):  
Particle Sizes ◽  
Laboratory Installation ◽  
Coverage Error ◽  
Dispersed Particles ◽  
Subsequent Processing ◽  
Video Recorder ◽  
Mechanical Interference ◽  
Storage Facilities

Was researched a small-dispersed dust from storage facilities in differend ranges. Was carried out acomparative analysis of the subsidence speed of the obtained particle sizes. The laboratory installation was upgraded and was installed the automatic sample dumping, and video recorder with the possibility of enlarging the image and manual focusing. Due to implementation of additional elements in the design of the installation, it was possible to exclude mechanical interference and simplify the design of the equipment. At the same time, it was possible to minimize coverage error during the experiment. The mainaim was to determine the dispersal composition with a recording on video equipment with subsequent processing of the obtained data.

Effect of marble particle size and gamma irradiation on mechanical properties of polymer concrete

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Gonzalo Martínez-Barrera ◽  
Witold Brostow
Keyword(s):  
Particle Size ◽  
Elastic Modulus ◽  
Unsaturated Polyester ◽  
Compression Modulus ◽  
Dynamic Elastic Modulus ◽  
Polymer Concrete ◽  
Medium Size ◽  
Particle Sizes ◽  
Compressive Properties ◽  
Dispersed Particles

AbstractEffects of gamma radiation and the marble particle size on compressive properties and the dynamic elastic modulus of polymer concretes (PCs) were studied. The PCs had a composition of 30 % of unsaturated polyester resin and 70 wt. % of marble as aggregate. Different types of PC were developed with the combination of one, two or three marble-particle sizes. The materials were submitted to 5, 10, 50, 100 and 150 kGy of radiation doses. Both the compressive properties and the dynamic elastic modulus values depend on the combination of the marble-particle sizes and the applied radiation dose. Higher numbers of dispersed particles per unit volume provide more resistance to crack propagation. On the other hand, longer particles give more reinforcement. As a result of these two competing effects, medium size marble particles provide the highest compression modulus

scholarly journals Measurement of Particle Sizes in Composite Materials Containing Dispersed Particles

1971 ◽  
Vol 28 (317) ◽  
pp. 715-718,769
Author(s):  
Akira Nakayama ◽  
Tadashi Ohsawa ◽  
Kazuo Mihira
Keyword(s):  
Composite Materials ◽  
Particle Sizes ◽  
Dispersed Particles

scholarly journals Studi penggunaan membran berslot untuk memproduksi emulsi minyak/air

2018 ◽  
Vol 9 (1) ◽  
pp. 19
Author(s):  
Putu Doddy ◽  
Ester Susanti ◽  
Debby Mariana
Keyword(s):  
High Speed ◽  
Particle Sizes ◽  
Feed Concentration ◽  
Uniform Size ◽  
Immiscible Liquids ◽  
Stable Particle ◽  
Dispersed Particles ◽  
Degree Of Stability ◽  
Size Of Particles ◽  
Degree Of Instability

Emulsion is dispersion system, which consist of two or more immiscible liquids. If this system is not stable, particle dispersed will form separate layer. The degree of instability will be greater if size of dispersed particles is not uniform. Generally, emulsion is produced by using high speed homogenizer, which will destruct the product. Some technology has been developed to overcome this problem. One of such technology is membrane emulsification, where the emulsion is flowed through the membrane so the size of particles will be smaller and more uniform. Symmetric membrane, which is used effectively to produce emulsion, has been used in this research. From the experiments, it has been proved that 28 microns membrane could produce emulsion, which has small and uniform size of particles. Emulsion with feed concentration of 10 % w/w and concentration of surfactant 3 % w/w has the highest degree of stability with particle sizes in the range of 3.5–13.5 microns. Fluxes were decreased if we use higher feed and surfactant concentration.Keywords: Emulsion, microfiltration, slotted membraneAbstrakEmulsi adalah dispersi dua atau lebih cairan yang tidak bercampur. Jika sistem ini tidak stabil, maka partikel terdispersi akan bergabung membentuk lapisan terpisah. Ketidakstabilan emulsi semakin tinggi jika ukuran partikel terdispersi besar dan distribusi ukurannya tidak seragam. Umumnya pembuatan emulsi dilakukan dengan pengadukan kecepatan tinggi yang merugikan jika bahan sensitif terhadap tekanan. Banyak cara dikembangkan untuk mengatasi hal ini, salah satunya adalah teknologi membran emulsifikasi, dimana emulsi dilewatkan melalui membran agar ukuran partikel terdispersi menjadi lebih kecil dan seragam sehingga emulsi stabil. Membran simetris yang efektif untuk memproduksi emulsi adalah membran mikrofiltrasi berslot seperti dalam penelitian ini. Hasil percobaan menunjukkan bahwa penggunaan membran berslot 28 m memberikan ukuran dan distribusi partikel yang kecil dan seragam. Emulsi minyak dalam air yang paling stabil adalah pada konsentrasi umpan 10% (b/b) dan konsentrasi surfaktan 3% (b/b) dengan ukuran partikel berkisar antara 3,5–13,5 µm. Fluks menurun bila konsentrasi umpan dan surfaktan semakin besar.Kata kunci: emulsi, mikrofiltrasi, membran berslot

scholarly journals STUDY OF THE STRUCTURE AND PROPERTIES OF LEAD-FREE RAPIDLY SOLIDIFIED ZINC-BASED ALLOYS DURING A HEAT TREATMENT

2021 ◽  
pp. 672-681
Author(s):  
Денис Александрович Зерница ◽  
Василий Григорьевич Шепелевич
Keyword(s):  
Heat Treatment ◽  
Room Temperature ◽  
Zinc Concentration ◽  
Second Phase ◽  
Particle Sizes ◽  
Dispersed Particles ◽  
Solution Proceeds ◽  
Melt Cooling ◽  
Rapidly Solidified ◽  
Tin Content

Представлены результаты исследований влияния сверхвысоких скоростей охлаждения расплава, равных не менее 10К/с, на свойства быстрозатвердевших сплавов системы Zn - Sn. Верхняя область фольги, контактирующая с кристаллизатором в процессе затвердевания, имела дисперсные частицы второй фазы, и по мере удаления от верхних слоёв размеры частиц укрупнялись. При комнатной температуре протекает распад пересыщенного твёрдого раствора с выделением дисперсных частиц. Дополнительная термическая обработка приводит к укрупнению частиц второй фазы, и способствует снижению микротвёрдости. Быстрозатвердевшие фольги с максимальной концентрацией цинка характеризуются наличием текстуры (0001), которая по мере увеличения содержания олова в цинке ослабляется, и при легировании выше 20 мас. % Sn происходит перестройка на текстуру (101̅0). Термическая обработка до 160 °С не приводит к изменению текстуры. The results of studies of the effect of ultrahigh melt cooling rates, equal to at least 10 K/s, on the properties of rapidly solidified alloys of the Zn - Sn system are presented. The upper region of the foil, in contact with the crystallizer during solidification, had more dispersed particles of the second phase, and as the distance from the upper layers increased, the particle sizes increased. At room temperature, the decomposition of a supersaturated solid solution proceeds with the release of dispersed particles. Additional heat treatment leads to the coarsening of the particles of the second phase, and helps to reduce the microhardness. Rapidly solidified foils with a maximum zinc concentration are characterized by the presence of a (0001) texture, which weakens as the tin content in zinc increases, and upon alloying up to 30 wt. % Sn is rearranged to (101̅0) texture. Heat treatment up to 160 °C does not change the texture.

Demonstration of the Use of Tape-Recorded Information from a High Vacuum Electron Microscope

1969 ◽  
Vol 27 ◽  
pp. 218-219
Author(s):  
Richard E. Hartman ◽  
Roberta S. Hartman ◽  
Peter L. Ramos
Keyword(s):  
Information Retrieval ◽  
Electron Microscope ◽  
Magnetic Tape ◽  
High Vacuum ◽  
Data Retrieval ◽  
Electronic Information ◽  
Electronic Data ◽  
Subsequent Processing ◽  
Continuous Record

We have long felt that some form of electronic information retrieval would be more desirable than conventional photographic methods in a high vacuum electron microscope for various reasons. The most obvious of these is the fact that with electronic data retrieval the major source of gas load is removed from the instrument. An equally important reason is that if any subsequent analysis of the data is to be made, a continuous record on magnetic tape gives a much larger quantity of data and gives it in a form far more satisfactory for subsequent processing.

Characteristic Geometry and Diffraction Contrast of Dispersed ThO2 Crystals

1969 ◽  
Vol 27 ◽  
pp. 168-169
Author(s):  
R. J. Horylev ◽  
L. E. Murr
Keyword(s):  
Dark Field ◽  
Particle Orientation ◽  
Contrast Effects ◽  
Strain Fields ◽  
Diffraction Contrast ◽  
Dispersed Particles ◽  
Field Electron Microscopy ◽  
Dark Field Electron ◽  
Particle Images ◽  
Diffraction Effects

Smith has shown by dark-field electron microscopy of extracted ThO2 particles from TD-nickel (2% ThO2) that they possess single crystal characteristics. It is generally assumed that these particle dispersions are incoherent. However, some diffraction effects associated with the particle images appeared to be similar to coherency strain fields. The present work will demonstrate conclusively that ThO2 dispersed particles in TD-nickel (2% ThO2) and TD-NiCr (2% ThO2, 20% Cr, Ni) are single crystals. Moreover, the diffraction contrast effects are extinction fringes. That is, these effects arise because of the particle orientation with respect to the electron beam and the extinction conditions for various operating reflections The particles are in fact incoherent.

Characterization of carbides in M50NiL

1991 ◽  
Vol 49 ◽  
pp. 606-607
Author(s):  
L. S. Lin ◽  
K. P. Gumz ◽  
A. V. Karg ◽  
C. C. Law
Keyword(s):  
Temperature Effects ◽  
Base Composition ◽  
Lattice Parameter ◽  
Control Surface ◽  
Carbide Formation ◽  
Particle Sizes ◽  
Low Carbon ◽  
Fee Structure ◽  
Heat Treated

Carbon and temperature effects on carbide formation in the carburized zone of M50NiL are of great importance because they can be used to control surface properties of bearings. A series of homogeneous alloys (with M50NiL as base composition) containing various levels of carbon in the range of 0.15% to 1.5% (in wt.%) and heat treated at temperatures between 650°C to 1100°C were selected for characterizations. Eleven samples were chosen for carbide characterization and chemical analysis and their identifications are listed in Table 1.Five different carbides consisting of M6C, M2C, M7C3 and M23C6 were found in all eleven samples examined as shown in Table 1. M6C carbides (with least carbon) were found to be the major carbide in low carbon alloys (<0.3% C) and their amounts decreased as the carbon content increased. In sample C (0.3% C), most particles (95%) encountered were M6C carbide with a particle sizes range between 0.05 to 0.25 um. The M6C carbide are enriched in both Mo and Fe and have a fee structure with lattice parameter a=1.105 nm (Figure 1).

TEM study on fine carbide precipitates and dislocation cell structure

1990 ◽  
Vol 48 (4) ◽  
pp. 904-905
Author(s):  
Mengzhe Chen ◽  
Siqin Wang ◽  
Jun Ke
Keyword(s):  
Carbide Particle ◽  
Cell Structure ◽  
Ferrite Matrix ◽  
Dislocation Cell ◽  
Isothermal Treatment ◽  
Particle Sizes ◽  
Dislocation Cell Structure ◽  
Thin Foils ◽  
Hsla Steels ◽  
Fine Carbide

A series of investigations have been conducted into the nature and origin of the dislocation cell structure. R.J.Klassen calculated that the dislocation cell limiting size in pure ferrite matrix is about 0.4 μm. M.N.Bassion estimated the size of dislocation cell in deformed ferrite of HSLA steels to be of the same order.In this paper, TEM observation has been concentrated on the interaction of fine carbide precipitates with dislocation cell structure in deformed Fe-C-V (0.05%C, 0.13% and 0.57%V) and Fe-C-Nb (0.07 %C and 0.04%Nb) alloys and compared with that in Fe-C (0.05%). Specimens were austenitized at 1500 “C/20 min and followed by isothermal treatment at 750 °C and 800 “C for 20, 40 and 120 minutes . The carbide particle sizes in these steels are from 9 to 86nm measured from carbon extraction replicas. Specimens for TEM were cut from differently deformed areas of tensile specimens deformed at room temperture. The thin foils were jet electropolished at -20 C in a solution of 10% perchloric acid and 90% ethanol. The TEM observation was carried out in JEM 100CX , EM420 at 100kv and JEM 2000FX at 200kv.

A High Resolution Study of Alumina Supported Iridium Catalysts

1980 ◽  
Vol 38 ◽  
pp. 202-203
Author(s):  
C. Stoeckert ◽  
B. Etherton ◽  
M. Beer ◽  
J. Gryder
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
Metal Particles ◽  
Optical Transfer Function ◽  
Particle Sizes ◽  
Iridium Catalysts ◽  
Transmission Electron ◽  
Optical Transfer ◽  
Conventional Transmission Electron Microscope ◽  
Resolution Study

The interpretation of the activity of catalysts requires information about the sizes of the metal particles, since this has implications for the number of surface atoms available for reaction. To determine the particle dimensions we used a high resolution STEM1. Such an instrument with its simple optical transfer function is far more suitable than a conventional transmission electron microscope for the establishment of particle sizes. We report here our study on the size and number distribution of Ir particles supported on Al2O3 and also examine simple geometric models for the shape of Ir particles.

Separation of Plasminogen Activators from Human Uterine Tissue and a Comparison with Activators from Human Urine and Porcine Tissue

1979 ◽  
Vol 41 (04) ◽  
pp. 718-733 ◽  
Author(s):  
Preben Kok
Keyword(s):  
Plasminogen Activator ◽  
Human Urine ◽  
Gel Filtration ◽  
Ammonium Thiocyanate ◽  
Plasminogen Activators ◽  
Particle Sizes ◽  
Uterine Tissue ◽  
Porcine Tissue ◽  
Major Activity ◽  
Proliferative Phase

SummaryThree types of plasminogen activator could be distinguished in extracts from human uterine tissue. The activators differed in thermostability or in mode of inhibition by EACA.All the extracts contained stable as well as labile activators. The saline extracts were uniformly inhibited by increasing concentrations of EACA. Extracts made with 2 M ammonium thiocyanate were either uniformly inhibited by EACA or showed deflections indicating contamination with an activator, which was inhibited in a biphasic manner. It was possible to distinguish between: (1) An activator, abundantly present in the tissue, which was uniformly inhibited and stable. (2) Another uniformly inhibited activator, which was labile. (3) An activator, inhibited in a biphasic manner, similar to urokinase, which was present in varying amounts in uteri with the endometrium in the proliferative phase.Gel filtration of the uterine extracts showed two major activity peaks corresponding to particle sizes of 60,000 dalton and about 10,000 dalton.Antiserum to purified plasminogen activator, prepared from porcine ovaries, inhibited the activity of the human uterine extracts, but not the activities of human urokinase or urine. Urokinase antiserum in a concentration completely inhibiting human urine or urokinase, inhibited only 10% or less of the activities of human uterine extracts.

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