scholarly journals Through-silicon-via formation of 3D electronic modules by laser radiation

Doklady BGUIR ◽  
2021 ◽  
Vol 19 (3) ◽  
pp. 58-65
Author(s):  
V. L. Lanin ◽  
V. T Pham ◽  
A. I. Lappo
Keyword(s):  
Laser Radiation ◽  
Local Heating ◽  
Laser System ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Laser Wavelength ◽  
Comsol Multiphysics ◽  
Through Silicon Via ◽  
Technical Requirements ◽  
High Specific Energy

Laser  heating  is  a  promising  method  for  through-silicon-via  (TSV)  formation  in  assembling  highdensity 3D electronic modules due to its high specific energy and local heating ability. Using laser radiation for the formation of TSV makes it possible to reduce its diameter, indirectly increases the density of elements in 3D electrical  modules.  Laser  system  selection  depends  on  the  physical  and  mechanical  properties  of  the processed materials and on the technical requirements for laserprocessing. The reflectivity of most materials increases with the laser wavelength. It was found that with an increase in the initial temperature of the substrate, the  TSV  taper  becomes  larger.  Simulation  was  performed  in  COMSOL  Multiphysics 5.6  to  conduct  thermal distribution during TSV laser formation. By modeling thermal fields in the COMSOL Multiphysics 5.6 software for  laser  processing  of  silicon  substrates  and  experimental  studies,  the  parameters  of  laser  radiation  have been optimized  to  obtain  a  minimum  hole  taper  coefficient  in  the  substrates  of  3D  electronic  modules. The optimal  duration of  exposure  to  laser radiation  with a  wavelength of 10.64 microns  is  less  than  2 s with holes taper 0.1–0.2.

scholarly journals SUBSTANTIATION OF THE PARAMETERS OF TILLAGE RINK

2017 ◽  
Vol 2 (3) ◽  
pp. 24-28
Author(s):  
Иван Шаронов ◽  
Ivan Sharonov ◽  
Владимир Курдюмов ◽  
Vladimir Kurdyumov ◽  
Виктор Курушин ◽  
...  
Keyword(s):  
Moisture Content ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Soil Tillage ◽  
Content Structure ◽  
Technical Requirements ◽  
Winter Crops ◽  
Crops Yield ◽  
Specific Metal

The purpose of research is improving the quality of surface tillage during sowing of winter crops and, as a result, crops yield increasing. Quality compacting soil tillage rinks affect its physical and mechanical properties, such as moisture content, structure, and density, optimum value of which is regulated agronomic requirements for cultivation of specific agricultural crops. These properties affect the quality of seeding and water-air regime of the soil. Therefore, when conducting experimental studies, moisture content, structure, and soil density was controlled to optimize parameters and modes of operation of the rink to bring the above soil properties in compliance with agro-technical requirements. The quality of soil the proposed rink was assessed in comparison with existing rinks. The criterion of quality was the factor of conformity to the standard kcs, which characterizes the compliance of the density and structure of the soil reference values established by the agrotechnical requirements. The result of the research revealed that the maximum value of kcs = 0.84 is achieved at a speed ofv = 11 km/h and the ballast mass m = 78 kg. After tillage rinks seeder the factor of conformity to the standard kcs = 0.68; after soil tillage the existing rink kcs = 0.71; and after the processing of the proposed soil-cultivating rink the factor of conformity to the standard amounted to kcs = 0.84, which is significantly higher than after soil tillage of existing rink. While the specific metal content of the proposed ice rink will not exceed 116 kg per 1 m of width, which is 2.4 times less than that of the rink 3CCH-6 (283.6 kg/m).

Effect of Wood Filler Concentration on Physical and Mechanical Properties of PLA-Based Composites

2021 ◽  
Vol 887 ◽  
pp. 110-115
Author(s):  
G.A. Sabirova ◽  
R.R. Safin ◽  
N.R. Galyavetdinov
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Composite Materials ◽  
Impact Strength ◽  
Wood Flour ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Filler Concentration ◽  
High Concentration

This paper presents the findings of experimental studies of the physical and mechanical properties of wood-filled composites based on polylactide (PLA) and vegetable filler in the form of wood flour (WF) thermally modified at 200-240 °C. It also reveals the dependence of the tensile strength, impact strength, bending elastic modulus, and density of composites on the amount of wood filler and the temperature of its thermal pre-modification. We established that an increase in the concentration of the introduced filler and the degree of its heat treatment results in a decrease of the tensile strength, impact strength and density of composite materials, while with a lower binder content, thermal modification at 200 °C has a positive effect on bending elastic modulus. We also found that 40 % content of a wood filler heated to 200 °C is sufficient to maintain relatively high physical and mechanical properties of composite materials. With a higher content of a wood filler, the cost can be reduced but the quality of products made of this material may significantly deteriorate. However, depending on the application and the life cycle of this product, it is possible to develop a formulation that includes a high concentration of filler.

scholarly journals RESEARCH OF PHYSICAL AND MECHANICAL PROPERTIES OF WOOD-FIBER MATERIALS

2020 ◽  
pp. 451-457
Author(s):  
Aleksandr Yur'yevich Vititnev ◽  
Yuriy Davydovich Alashkevich ◽  
Natal'ya Geral'dovna Chistova ◽  
Roman Aleksandrovich Marchenko ◽  
Venera Nurullovna Matygullina
Keyword(s):  
Mechanical Properties ◽  
Wood Fiber ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Production Method ◽  
Strength Properties ◽  
Grinding Process ◽  
Technological Parameters ◽  
Fiber Materials ◽  
Traditional Construction

This paper presents the results of experimental studies of the physical and mechanical properties of wood-fiber boards of the wet production method when regulating the design and technological parameters of the grinding process. This allowed us to determine the influence of the working clearance between the grinding discs and the concentration of fibre mass with the subject to of quality change wood fiber after defibrator using the developed construction of the disc fibrillation action on the physico-mechanical properties of boards. As a result of the experiment, regression models were obtained that adequately describe the studied grinding process and allow predicting the values of physical and mechanical properties of the finished product depending on the established  parameters process. A comparative analysis of the size and quality characteristics of the fiber semi-finished product and its fractional composition when using a developed construction the disc of refiner fibrillation action and a traditional design used in industry is carried out. The preferential efficiency of the grinding process under the fibrillating effect the disc of refiner in comparison with the traditional construction disc of refiner is established. As a result, there is a significant improvement in the quality indicators of the fiber semi-finished product and its composition due to the formation and predominance in the total mass of long and thin, respectively, flexible fibrillated fibers with high tile-forming properties, which allows to increase the strength properties of the product (by 20–25%), without using binding resins.

scholarly journals Numerical simulation of changes in the electric properties of biological tissues under local heating by laser radiation

2021 ◽  
Vol 2090 (1) ◽  
pp. 012049
Author(s):  
N V Kovalenko ◽  
A V Smirnov ◽  
O A Ryabushkin
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Laser Radiation ◽  
Optical Radiation ◽  
Local Heating ◽  
Biological Tissues ◽  
Electric Properties ◽  
Reliable Tool ◽  
The Mathematical Model

Abstract The mathematical model that describes the local heating of biological tissues by optical radiation is introduced. Changes of the electric properties of biological tissues in such process can be used as a reliable tool for analyzing heating and damage degrees of tissues.

scholarly journals ENGINEERING MANAGEMENT OF MACHINE FOR FORMATION OF ARTIFICIAL SHELL ON SEED VEGETABLE CULTURES

2020 ◽  
Vol 61 (2) ◽  
pp. 165-174 ◽  
Author(s):  
I.L. Rogovskii ◽  
L.L. Titova ◽  
V.I. Trokhaniak ◽  
L.I. Marinina ◽  
O.T. Lavrinenko ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Experimental Tests ◽  
Dynamic Mode ◽  
Seed Coating ◽  
Experimental Sample ◽  
Sowing Time ◽  
Seed Material ◽  
Internal Friction Coefficient

The article analyses the universalization of the seed material by its physical and mechanical properties by means of pre-sowing treatment, resulting in the formation of an artificial shell. As a result of the generalization, a technological scheme of obtaining an encapsulated seed and a design of a seed coating machine was proposed. A simulation model of the sowing accuracy process from the internal friction coefficient of seeds at different root mean square deviations of seed sizes is proposed. The regression equation for the influence of the dynamic mode of operation of the developed experimental sample of seed coating machine is established. According to the experimental studies’ results, the static and dynamic friction coefficients of the encapsulated vegetable seeds on the steel and plastic working surfaces of seed coating machine were established. Under the production conditions, experimental tests were conducted to compare the seedlings of untreated, coated, branded and encapsulated seeds of vegetables by the quality of prepared seed material and sowing time.

scholarly journals Scanning electron microscope studies on laser ablation of solids

2019 ◽  
Vol 37 (01) ◽  
pp. 101-109 ◽  
Author(s):  
Mohamed E. Shaheen ◽  
Joel E. Gagnon ◽  
Brian J. Fryer
Keyword(s):  
Pulse Width ◽  
Laser Energy ◽  
Laser System ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Ablation Rate ◽  
Laser Wavelength ◽  
High Laser Fluence ◽  
Electron Imaging ◽  
Scanning Electron

AbstractThis study investigates the interaction of picosecond laser pulses with sapphire and brass in air using scanning electron microscopy. A picosecond laser system operating at a wavelength of 785 nm, pulse width of 110 ps, and variable repetition rate (1–1000 Hz) was used in this study. The pulse width applied in this work was not widely investigated as it lies in the gap between ultrashort (femtosecond) and long (nanosecond) pulse width lasers. Different surface morphologies were identified using secondary electron and backscattered electron imaging of the ablated material. Thermal ablation effects were more dominant in brass than in sapphire. Exfoliation and fractures of sapphire were observed at high laser fluence. Compared with brass, multiple laser pulses were necessary to initiate ablation in sapphire due to its poor absorption to the incident laser wavelength. Ablation rate of sapphire was lower than that of brass due to the dissipation of a portion of the laser energy due to heating and fracturing of the surface.

Impact of Superplasticizing Agents on Physical and Mechanical Properties of Cellular Concrete

2019 ◽  
Vol 974 ◽  
pp. 181-186
Author(s):  
V.A. Perfilov ◽  
V.V. Gabova ◽  
Inessa A. Tomareva
Keyword(s):  
Mechanical Properties ◽  
Pore Structure ◽  
Pore Space ◽  
Experimental Studies ◽  
Basalt Fiber ◽  
Physical And Mechanical Properties ◽  
Foam Concrete ◽  
Cellular Concrete

The effect of superplasticizing, foam agents, various fiber aggregates on the physical and mechanical properties of cellular concrete has been studied. The article covers the results of experimental studies conducted to determine the effect of foam agents PO-6 and PB-2000, as well as polymeric and basalt fiber on the pore structure of foam concrete. The dependence between the change in density and strength of cellular concrete and the structure of its pore space has been determined.

The Feature of Laser Deposition of Polymeric Composite Films from an Active Gas Phase

2011 ◽  
Vol 480-481 ◽  
pp. 30-35 ◽  
Author(s):  
Zhu Bo Liu ◽  
Xiao Hong Jiang ◽  
Bing Zhou ◽  
M.A. Yarmolenko ◽  
D.L. Gorbachev ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Gas Phase ◽  
Composite Films ◽  
Polymeric Composite ◽  
Laser Wavelength ◽  
Attenuated Total Reflection ◽  
Silicon Films ◽  
Organic Silicon ◽  
Order Degree ◽  
532 Nm

The organic-silicon films, polytetrafluorethylene (PTFE) films and its composite films with copper have been fabricated from an active gas phase by pulse laser dispersion from initial powder species. The features of all films obtained were studied with the application of attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy. Our results suggest that the wavelength of laser radiation impact a strong effect on the molecular structure of all films. Specifically, the peaks corresponding to the detachment of C-H bonds in the organic-silicon films and its Cu doped films at a laser wavelength of 532 nm and the destruction of the Si-O-Si groups at 266 nm due to the ultraviolet radiation have been observed. Interestingly, the concentration of Si-С6Н5 groups relative increases with a decremental of the wavelength of laser radiation. In addition, the PTFE films formed at a laser wavelength of 355 nm presented a lower order degree and high amorphous phase, while PTFE-Cu composite films at laser wavelength 266 nm exhibited enhanced crystallinity due to the presence of copper species, wherein being served as nucleation centers. Remarkably, the wavelengths of laser radiation nearly play no effect on the orderness of PTFE-Cu composite films.

scholarly journals RESULTS OF MULTIVARIATE EXPERIMENT TO DETERMINE DEPENDENCE OF THE MAXIMUM PRESSURE OF TRACTOR WHEELS ON THE SOIL FROM TRACTOR’S PARAMETERS AND PHYSICAL AND MECHANICAL PROPERTIES OF SOIL. STATISTICAL ANALYSIS

2017 ◽  
pp. 94-98
Author(s):  
Хафизов ◽  
Kamil Khafizov ◽  
Хафизов ◽  
Ramil Khafizov
Keyword(s):  
Mechanical Properties ◽  
Similarity Theory ◽  
Experimental Studies ◽  
Similarity Criterion ◽  
Statistical Processing ◽  
Physical And Mechanical Properties ◽  
Multiple Correlation Coefficient ◽  
Similarity Criteria ◽  
Maximum Pressure ◽  
Regression Equations

A similarity criteria were reveled to determine the dependence of maximum pressure of the tractor wheel on the soil on the basis of the use of similarity theory. Each similarity criterion includes several parameters, characterizing the tractor, its propeller and physical and mechanical properties of the soil. The similarity criteria is taken as factors in the multivariate experiment. Multifactorial experimental studies were planned and carried out. We used Statistics Toolbox subsystem of Matlab computer mathematics system for processing the results of experiments. As a result of statistical processing of the experimental data by the equation we obtained a dependence of maximum pressure of the tractor wheel on the soil from tractor parameters, and physical and mechanical properties of the soil. Statistical data on the equations, such as - multiple correlation coefficient, Fisher’s criterion, Student’s criterion, indicate the significance of equations of the experiments variants, as well as the significance of the coefficients of the regression equations.

scholarly journals PROSPECTS OF DISK PUMP FOR MECHANICAL CIRCULATORY SUPPORT IN CARDIAC SURGERY (REVIEW)

2016 ◽  
Vol 18 (3) ◽  
pp. 68-73 ◽  
Author(s):  
A. M. Chernyavskiy ◽  
A. V. Fomichev ◽  
T. M. Ruzmatov ◽  
A. E. Medvedev ◽  
Yu. M. Prikhodko ◽  
...  
Keyword(s):  
Support Systems ◽  
Experimental Studies ◽  
Viscous Friction ◽  
Left Ventricular ◽  
Circulatory Support ◽  
Published Data ◽  
Technical Requirements ◽  
New Directions ◽  
Further Development ◽  
Mechanical Heart Support

The need of circulatory support systems in the treatment of chronic heart failure is increasing constantly, as 20% of the patients on the waiting list die every year. Despite the great need for mechanical heart support systems, the use of available systems is limited by its expensiveness. In addition, there is no one system that is 100% responsible to all medical and technical requirements and that would be completely safe for patient. Therefore, further research in the field of circulatory support systems considering health and technical requirements is relevant. One of the new directions in the study are disc pumps of viscous friction for liquid transporting, based on the Tesla pump principle. The operation principle of such pumps is based on the phenomenon of the boundary layer which is formed on the disk rotating in a fluid. There are experimental studies of models with different variants of the rotor suspension, various forms and numbers of the disks, forms of the pump housing. However, none of the above samples was brought to clinical trials. Furthermore, despite the potential of that model there have been no pumps of similar type used so far in circulatory support systems. Published data provide a basis for further development and testing of the pump model and allow hoping for leveling a number of significant shortcomings of modern left ventricular bypass systems. 

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