scholarly journals Зерноочистительные машины ПАЗМАН

2020 ◽  
Author(s):  
V.A. Nikolaev ◽  
I.V. Kryaklina
Keyword(s):  
Feed Rate ◽  
Operating Principle ◽  
Significant Part ◽  
Logical Contradiction ◽  
Main Disadvantage ◽  
Cleaning Machine ◽  
Vertical Vibrations

Основным недостатком зерноочистительных машин с прямоугольными решётами является ограниченная пропускная способность, обусловленная логическим противоречием. Оно заключается в том, что по мере прохода сквозь решето количество очищаемого материала на решете уменьшается, а ширина решета остаётся неизменной. При этом значительная часть решета работает неэффективно, так как только часть его поверхности покрыта очищаемым материалом. Чтобы повысить эффективность работы зерноочистительных машин, рёшета сдваивают и располагают в два или три яруса, увеличивают подачу на верхние решёта, но при этом снижается качество работы зерноочистительной машины. Поскольку по мере прохождения материала сквозь решето количество очищаемого материала на нём уменьшается, рационально было бы применять трапецеидальное решето. Однако конструктивная реализация зерноочистительной машины с трапецеидальными решётами затруднена. Для преодоления этого противоречия предложена зерноочистительная машина с решетом, представляющим перевёрнутый усечённый конус, который совершает вертикальные колебания. Приведено описание конструкции и принципа действия этой машины. Разработан модельный ряд зерноочистительных машин ПАЗМАН.The main disadvantage of grain cleaning machines with rectangular sieves is the limited throughput due to a logical contradiction. It lies in the fact that the amount of cleaned material on the sieve when passing through the sieve decreases and the width of the sieve remains unchanged. At the same time a significant part of the sieve works inefficiently as only part of its surface is covered with the cleaned material. To increase the efficiency of grain cleaning machines the sieves are doubled and placed in two or three chains, the feed rate to the upper chains is increased but the quality of the grain cleaning machine is reduced. Since as the material passes through the sieve the amount of material to be cleaned on it decreases, it would be rational to use a trapezoidal sieve. However the structural implementation of a grain cleaning machine with trapezoidal sieves is difficult. To overcome this contradiction a grain cleaning machine with a sieve representing an inverted flattened cone that performs vertical vibrations is proposed. The design and operating principle of this machine are described. A range of grain cleaning machines PAZMAN has been developed.

ENTREPRENEURIAL ACTIVITIES MODELING IN THE HOSPITALITY INDUSTRY BASED ON THE USE OF LAND CADASTRAL VALUATION INDICATORS

2017 ◽  
Author(s):  
Raisa Kozhukhіvska ◽  
◽  
Оlena Sakovska ◽  
Keyword(s):  
Financial Support ◽  
Hospitality Industry ◽  
The State ◽  
Practical Significance ◽  
Time Intervals ◽  
Main Disadvantage ◽  
Entrepreneurial Activities ◽  
The City ◽  
Cluster Level

The article examines the organizational basis of modeling entrepreneurial activities in the hospitality industry based on the use of indicators of cadastral assessment of land. The analysis of practical aspects of updating the results of cadastral assessment of lands of settlements of Cherkassy region has been carried out. It is stated that the cadastral assessment should take into account market situations and trends as much as possible. For the territories of localities the term of actualization in the context of revaluation should be minimum and economically justified. It is designated that the updating of the results of the state cadastral assessment of land requires significant modernization aimed at improving the quality of land assessment work and adequate replenishment of budgets at all levels. The mechanism and features of performance of works on actualization of the state cadastral estimation of the lands of settlements in the territory of Cherkassy region have been analyzed. As a result of the study, it has been found that the main disadvantage of modeling the cadastral assessment of land settlements is: the duration of time intervals between rounds of revaluation, which causes rapid aging of information. The reason for this case is related with the financial support of the works and their scale. Mechanisms for prompt updating of information on the value of land for entrepreneurial activities in the hospitality industry in Cherkassy region have been proposed. The considered method of determining the normative monetary valuation of land takes into account the most important indicators of this industry and is practically significant in collecting information and calculating all indicators in conducting cadastral valuation of land for entrepreneurial activities in the hospitality industry of Cherkassy region. The practical significance of the study is to assess the cadastral condition of land and calculate the specific cadastral value of the city of Uman, as the territory where the hospitality industry is the most developed in Cherkassy region. Due to the clarification of the specific indicator of cadastral value, the price of one square meter of such objects will increase which will allow to proportionally increase the tax component and increase the profitability of budgets at the cluster level

scholarly journals Minimally invasive combined surgical treatment of postcoital cystitis

2020 ◽  
Vol 21 (2) ◽  
pp. 20-25
Author(s):  
J. Sh. Inoyatov ◽  
O. V. Snurnitsyna ◽  
M. V. Lobanov ◽  
O. Yu. Malinina ◽  
Yu. L. Demidko ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Main Group ◽  
Control Group ◽  
Efficacy And Safety ◽  
Study Objective ◽  
Results Of Treatment ◽  
Main Disadvantage ◽  
Combined Technique ◽  
Treatment Profile

Introduction. Urethral transposition remains the most popular operation for postcoital cystitis, however, traumatism and complications, especially such as pudendal neuropathies, dyspareunia and anorgasmia, make us continue to search for effective, but safer techniques.The study objective is to evaluate the efficacy and safety of the proposed treatment of postcoital cystitis, including removal of urethrogymenal adhesions and subsequent paraurethral filler implantation, in comparison with isolated hymenoplasty.Materials and methods. Since 2013, 75 patients with postcoital cystitis have been treated. Patients were divided into two groups: main group – hymenoplasty (removal of urethral adhesions) with paraurethral filler implantation (n = 45), control group – hymenoplasty (n = 30). The gel was injected paraurethrically, fan-shaped, in the volume of 1–2 ml, from a point on the 6-hour conditional dial, creating a gel cushion and thus raising the meautus and distal urethra. To assess the quality of treatment, profile questionnaires were used.Results. In the main group of patient, the quality of life improved in 35 (78 %); in 5 patients, due to the process of biodegradation of the gel during 1 year, the cystitis recidivated, which required the filler reimplantation. In 5 patients, the operation was not effective. In the control group the efficiency of isolated hymenoplasty was noted in 3 (10 %) patients, relapse of cystitis occurred in 27 (90 %) patients, which later required the implantation of a filler. No complications were observed.Conclusions. The suggested combined technique allows to improve the results of treatment of patients with postcoital cystitis. The operation does not carry the risk of damage to the sprigs of the genital nerve, can serve as an alternative to traditional urethral transposition. The main disadvantage is the natural biodegradation of the gel, which may create the need for its reintroduction.

scholarly journals Determination of the Optimal Parameters in Brass Turning Process by Taguchi method

2021 ◽  
Vol 9 (7) ◽  
pp. 929-936
Keyword(s):  
Taguchi Method ◽  
Feed Rate ◽  
Material Removal ◽  
Depth Of Cut ◽  
Optimal Parameters ◽  
Turning Process ◽  
Control Factors ◽  
Variable Control

This research is a study of the turning process by testing with brass material. There are three control factors: spindle of speed, feed rate, and depth of cut respectively. The turning process requires variable control,affect the quality of production productivity and production costplanning an experiment with the Taguchi Method help in theexperiment the analysis of variance, orthogonal array, and signal and noise ratios were considered as an experiment and survey of brass turning characteristics to determine the lowest material removal rate.The results obtained from the experiment were used to repeat the experiment for confirmation. This requires the turning process to be reliable and optimized

scholarly journals Research on the parameters of producing filamentous textured soybean protein with soybean protein isolated and soybean protein concentrate

2018 ◽  
Vol 238 ◽  
pp. 04006
Author(s):  
Aiping Fei ◽  
Xiaoliang Hao ◽  
Junyu Jiang ◽  
Yong Wang ◽  
Yingxue Teng ◽  
...  
Keyword(s):  
Feed Rate ◽  
Protein Production ◽  
Rotation Speed ◽  
Raw Materials ◽  
Soybean Protein ◽  
Protein Concentrate ◽  
Screw Speed ◽  
Soybean Protein Concentrate

Textured soybean protein (TSP) is a product made from cooking and extrusion of soybean protein, which has been widely used in food, feed and other industries. This text made soybean protein isolated (SPI) and soybean protein concentrate (SPC) as the raw materials to produce filamentous protein production. By experiment, the influence of puffing temperature, screw speed and feed rate on the quality of the protein products was studied. Finally it was concluded that when the temperature of the barrel was 152 °C, the screw rotation speed was 119 rpm, the feed rate was 0.426 kg/min, the TSP product had the biggest expansion degree.

scholarly journals Influence of Elastomer Layers in the Quality of Aluminum Parts on Finishing Operations

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 289 ◽  
Author(s):  
Antonio Rubio-Mateos ◽  
Asuncion Rivero ◽  
Eneko Ukar ◽  
Aitzol Lamikiz
Keyword(s):  
Process Parameters ◽  
Feed Rate ◽  
Cutting Speed ◽  
Milling Process ◽  
Machining Process ◽  
Butadiene Rubber ◽  
Compression Tests ◽  
Compressive Behavior ◽  
Finishing Processes

In finishing processes, the quality of aluminum parts is mostly influenced by static and dynamic phenomena. Different solutions have been studied toward a stable milling process attainment. However, the improvements obtained with the tuning of process parameters are limited by the system stiffness and external dampers devices interfere with the machining process. To deal with this challenge, this work analyzes the suitability of elastomer layers as passive damping elements directly located under the part to be machined. Thus, exploiting the sealing properties of nitrile butadiene rubber (NBR), a suitable flexible vacuum fixture is developed, enabling a proper implementation in the manufacturing process. Two different compounds are characterized under axial compression and under finishing operations. The compression tests present the effect of the feed rate and the strain accumulative effect in the fixture compressive behavior. Despite the higher strain variability of the softer rubber, different milling process parameters, such as the tool feed rate, can lead to a similar compressive behavior of the fixture regardless the elastomer hardness. On the other hand, the characterization of these flexible fixtures is completed over AA2024 floor milling of rigid parts and compared with the use of a rigid part clamping. These results show that, as the cutting speed and the feed rate increases, due to the strain evolution of the rubber, the part quality obtained tend to equalize between the flexible and the rigid clamping of the workpiece. Due to the versatility of the NBR for clamping different part geometries without new fixture redesigns, this leads to a competitive advantage of these flexible solutions against the classic rigid vacuum fixtures. Finally, a model to predict the grooving forces with a bull-nose end mill regardless of the stiffness of the part support is proposed and validated for the working range.

The Influence of the Feed Rate on the Quality of Surfaces Processed by AWJ at High Pressures

2013 ◽  
Vol 837 ◽  
pp. 196-200
Author(s):  
Carol Schnakovszky ◽  
Eugen Herghelegiu ◽  
Crina Radu ◽  
Ion Cristea
Keyword(s):  
Automobile Industry ◽  
Feed Rate ◽  
Food Industry ◽  
High Pressures ◽  
Mining Industry ◽  
Water Jet ◽  
Abrasive Water Jet ◽  
Metallic Materials ◽  
Wood Industry

Abrasive water jet processing is one of the newest unconventional technologies. It can be used to cut different metallic materials (steel, titanium alloys, aluminium alloys, brass) or non-metallic materials (wood, plastics, glass, stone, granite etc.). Therefore, this technology can be successfully applied in different industries as: food industry, wood industry, aeronautic industry, automobile industry, mining industry. Between the advantageous of abrasive water jet processing technology it is worth noticing the following: it is rapid, very small processing forces are generated, it is silent, no thermal distortions occur. The aim of the current paper was to determine the influence of the feed rate on the quality of surfaces processed by AWJ at high pressure. The parameters that quantified the quality of the processed surface were those defined in the ISO/WD/TC 44 N 1770 standard: width of the processed surface at the jet inlet (Li), width of the processed surface at the jet outlet (Lo), deviation from perpendicularity (u), inclination angle (α) and roughness (Ra).

Experimental Evaluation of Surface Roughness in Orthogonal Micro-Milling Processes

2012 ◽  
Vol 217-219 ◽  
pp. 1912-1916
Author(s):  
Ji Hua Wu
Keyword(s):  
Surface Roughness ◽  
Feed Rate ◽  
Experimental Approach ◽  
Critical Role ◽  
Cutting Speed ◽  
Chip Thickness ◽  
Micro Milling ◽  
Surface Model ◽  
Material Grain Size

Surface roughness plays a critical role in evaluating and measuring the surface quality of a machined product. Two workpiece materials have been investigated by experimental approach in order to gain a better understanding of their influence on the obtained surface roughness in the micro-milling processes. The experimental results show that: surface topography is completely different for different materials at the same cutting speed and feed rate; surface roughness increases with an increase of material grain size. Surface roughness decreases to a lowest value, and then increases with an increase of the feed rate. A new surface model to illustrate the influence of material and uncut chip thickness was developed. The model has been experimentally validated and shows more promising results than Weule’s model.

Assessment of Hole Quality and Thrust Force when Drilling CFRP/Al Stack Using Carbide Tools

2012 ◽  
Vol 234 ◽  
pp. 28-33 ◽  
Author(s):  
Sina Alizadeh Ashrafi ◽  
Safian Sharif ◽  
Yahya Mohd Yazid ◽  
Ali Davoudinejad
Keyword(s):  
Feed Rate ◽  
Thrust Force ◽  
Cutting Speed ◽  
Composite Plates ◽  
Machining Performance ◽  
Coated Tools ◽  
Reinforced Plastic ◽  
Metal Chips ◽  
Drilling Conditions

Drilling composite materials is challenging due to the anisotropic and non-homogenous structure of composites. In fabrication works, metals are joined to composites to form a hybrid strengthened structures, and this posed a great problem during drilling, due to the dissimilar drilling conditions for each material and also sharp metal chips effect on the quality of hole on composite plates. This paper evaluates the experimental results on the machining performance of coated and uncoated 4 facet carbide drills when dry drilling stack of carbon fiber reinforced plastic (CFRP) and aluminum. Drilling trials were carried out on CFRP/Al2024/CFRP stack at constant cutting speed of 37 m/min with three feed rates within 0.03-0.25 mm/rev. Results revealed that 4 facet coated drills performed better than uncoated drills in terms of delamination. It was found that hole entry delamination increases with increasing feed rate, however uncut fibers which were dominant at low feeds on hole exit, disappears with increasing feed rate. It was also found that thrust force for coated tools were quite higher than uncoated tools.

Microstructure and Mechanical Properties of FSWed Aluminum Extrusion with Bobbin Tools

2012 ◽  
Vol 706-709 ◽  
pp. 990-995 ◽  
Author(s):  
K. Okamoto ◽  
A. Sato ◽  
Seung Hwan C. Park ◽  
Satoshi Hirano
Keyword(s):  
Mechanical Properties ◽  
Feed Rate ◽  
Rotation Speed ◽  
Tool Design ◽  
Aluminum Extrusion ◽  
Tool Rotation Speed ◽  
Process Robustness ◽  
Tool Rotation ◽  
Process Productivity

Bobbin FSW technique is assessed in terms of process productivity and robustness considering the metallurgical and mechanical qualities of the joint. Several different designed bobbin tools were applied to aluminium A6xxx alloy extrusions, at feed rate of 400-1000mm/min with tool rotation speed of 600-1000rpm. In case of A6068-T6, a joint efficiency of 68% was achieved at 600mm/min, which is almost equivalent to the productivity and quality of the conventional FSWed joints, hence the potential of bobbin FSW technique was suggested. The bobbin tool design was further optimized considering the practical process robustness to the part fit issue, and defect free welds have been achieved for the joints with a set gap up to 1mm. However, the oxide remnant, so called “lazy S” was observed in a joint made with an inadequate designed tool, which significantly deteriorates the mechanical properties.

scholarly journals The Quality of Medical Services in Kyrgyzstan

2016 ◽  
Author(s):  
Damira Japarova ◽  
Damira Baigonushova
Keyword(s):  
Disease Prevention ◽  
Human Health ◽  
Hospital Care ◽  
Socioeconomic Development ◽  
Health Workers ◽  
Modern Technology ◽  
Significant Part ◽  
Medical Services ◽  
Quality Of Treatment

Human health determines the measure of socioeconomic development of the country. Inspiration of health workers’ work’s quality does not go beyond the salary. Doctors noted a lack of motivation to improve the quality of medical services. The reason for the low quality of treatment is the lack of modern technology and the deficiency of specialists. A significant part of the funds should be directed to financing of outpatient level instead of expensive hospital care. It is necessary to implement financing on disease prevention. The quality of polyclinics should be evaluated by considering the number of prescribed or treated patients, where the patient gives his vote using his personalized account.

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