scholarly journals INFLUENCE OF THE BALLAST RESISTANCE ON THE STABILITY OF CONTINUOUS WELDED RAIL

2020 ◽  
Author(s):  
Dominik Pokropski
Keyword(s):  
Critical Force ◽  
Maximum Temperature ◽  
Railway Traffic ◽  
Continuous Welded Rail ◽  
The Finite Difference Method ◽  
The Stability ◽  
The Impact ◽  
Resistance Value ◽  
Ballast Resistance

The article is about the issue of the influence of ballast resistance on the stability of the Continuous Welded Rail. The ballast resistance affects both the longitudinal and transverse displacements. It depends on the quality of the ballast, the degree of its compaction and contamination. The article contains an analysis of the impact of ballast resistance on the track based on the Finite Difference Method. The calculations showed that the resistance value directly affects the allowable critical force and the maximum temperature rise in the rail that does not endanger the safety of railway traffic.

Structural and functional analysis of reconnaissance and fire system and decomposition of its functions and subsystems

2021 ◽  
pp. 38-48
Author(s):  
O. Maistrenko ◽  
O. Karavanov ◽  
A. Shcherba
Keyword(s):  
Functional Analysis ◽  
Fire Damage ◽  
Expert Group ◽  
Expert Evaluation ◽  
Military Conflicts ◽  
Main Factors ◽  
The Stability ◽  
The Impact

It is established that the role of reconnaissance and fire systems in the implementation of enemy fire damage in military conflicts occurring at the beginning of the XXI century. Increased  to 75%. However, it was found that the effectiveness of these systems depends on the quality of their equipment. The main factors that are often not taken into account in the acquisition are the possibility, interoperability, stability of each element, the impact of elements on the stability of each other and the functioning of the RVS as a whole. The analysis of recent research and publications has shown that as of today, the approaches to determining the composition of reconnaissance fire systems taking into account these factors are not justified. Given the above, it was decided to conduct a structural and functional analysis of the reconnaissance fire system and the decomposition of its functions and subsystems. To this end, based on the method of cluster analysis, an algorithm for combining a set of tasks performed by reconnaissance and fire systems into groups has been developed and substantiated. The method of expert evaluation was used to obtain substantiated data on the implementation of such a merger. According to the proposed algorithm, the main tasks were first identified, which involve reconnaissance and fire systems. Subsequently, an expert group was formed and the coefficient of relative competence of each member of the expert group was determined. The experts were then asked to combine the identified tasks according to their characteristics into an arbitrary number of groups. After processing the opinions of experts, 10 characteristic groups were identified. Finally, the experts were asked to combine the obtained groups in such a way that each association consisted of similar objects and the objects of different associations differed significantly. The results of the work revealed the functional interconnectedness of the tasks, processes and subsystems of the reconnaissance and fire system. It is also established that a typical reconnaissance fire system will consist of three subsystems (control, reconnaissance and fire influence), which perform specific functions for each of them.

scholarly journals IMPROVEMENT OF THE STRUCTURAL LAYOUT OF POTATO PLANTERS’ COULTER GROUP

2021 ◽  
pp. 81-90
Author(s):  
Alexey Semenovich Dorokhov ◽  
Andrey Grigoryevich Ponomarev ◽  
Vitaly Nikolaevich Zernov ◽  
Sergey Nikolaevich Petukhov ◽  
Alexander Gennadievich Aksenov ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Acute Angle ◽  
Sharp Angle ◽  
Maximum Extent ◽  
Automatic Maintenance ◽  
Potato Planter ◽  
Growing Conditions ◽  
The Stability ◽  
The Impact

Structural layouts of coulters and their groups in potato planters are justified in the article based on the morphological features of the potato plant, its requirements for growing conditions and ensuring the quality of the planting process. The purpose of coulter groups is to form a bed for placing tubers with a loose layer of soil in 5-8 cm and sealing them with loosened soil to a certain depth. To substantiate the type of potato planter coulters that meet the requirements for potato growing conditions to the maximum extent possible, optimize the parameters of coulter groups that automatically ensure the stability of the coulter travel depth when imitating irregularities of the field microrelief. A comparative analysis of the impact on the soil of the most common anchor coulters with a blunt angle of soil entry and a sharp angle with an individual floating suspension is given, and indicators of the quality of their operation are described. It was found that coulters with an individual floating suspension and an acute angle of soil entry meet the requirements for potato growing conditions to the maximum extent possible. In order to ensure travel stabilization of such a coulter at a given depth when imitating field irregularities, a version of the coulter group has been developed that provides automatic correction of the coulter's angle of attack when changing its travel depth. Experimental studies have optimized the parameters of the coulter suspension that ensure automatic imitation of field microrelief irregularities up to 20 cm deep within the initial requirements for potato planting machines. Coulters with an individual floating suspension and a sharp angle of soil entry most fully meet the requirements for potato growing conditions to the maximum extent possible. A coulter group with a suspension aspect ratio of 150:200:400:400 cm and an acute angle of coulter entry into the soil provides automatic maintenance of the set coulter travel depth within the initial requirements (±2 cm) for irregularities in the field microrelief of up to 200 mm. In this case, the bottom and walls of the furrow are not compacted.

scholarly journals Studies of the Impact of Hydrogen on the Stability of Gaseous Mixtures of THT

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6441
Author(s):  
Anna Huszal ◽  
Jacek Jaworski
Keyword(s):  
Natural Gas ◽  
Distribution Network ◽  
Experimental Tests ◽  
Gaseous Mixtures ◽  
Odorant Molecule ◽  
Measurement Devices ◽  
The Stability ◽  
The Impact ◽  
Hydrogen Additive

One of the most important requirements concerning the quality of natural gases, guaranteeing their safe use, involves providing the proper level of their odorization. This allows for the detection of uncontrolled leakages of gases from gas networks, installations and devices. The concentration of an odorant should be adjusted in such a manner that the gas odor in a mixture with air would be noticeable by users (gas receivers). A permanent odor of gas is guaranteed by the stability of the odorant molecule and its resistance to changes in the composition of odorized gases. The article presents the results of experimental research on the impact of a hydrogen additive on the stability of tetrahydrothiophene (THT) mixtures in methane and in natural gas with a hydrogen additive. The objective of the work was to determine the readiness of measurement infrastructures routinely used in monitoring the process of odorizing natural gas for potential changes in its composition. One of the elements of this infrastructure includes the reference mixtures of THT, used to verify the correctness of the readings of measurement devices. The performed experimental tests address possible changes in the composition of gases supplied via a distribution network, resulting from the introduction of hydrogen. The lack of interaction between hydrogen and THT has been verified indirectly by assessing the stability of its mixtures with methane and natural gas containing hydrogen. The results of the presented tests permitted the identification of potential hazards for the safe use of gas from a distribution network, resulting from changes in its composition caused by the addition of hydrogen.

A Compound Strategy to Optimize the Output Characteristics of Mid-Frequency Inverter

2013 ◽  
Vol 380-384 ◽  
pp. 2999-3002
Author(s):  
Di Wu ◽  
Qi Jun Wu ◽  
Rong Zhao Zhu
Keyword(s):  
Constant Voltage ◽  
Constant Frequency ◽  
Light Load ◽  
Voltage Quality ◽  
Output Characteristics ◽  
The Stability ◽  
Lc Filter ◽  
The Impact ◽  
Frequency Inverter

To improve the stability and output voltage quality of inverter, an new repetitive control strategy for 400Hz Constant Voltage Constant Frequency (CVCF) inverter has been proposed . Based on active damping, this strategy damps the oscillations on the output LC filter of inverter under unload or light load. Using state-observer to weaken the impact of time delay in digital control, a 5.5 kW one-phase 400Hz inverter prototype by this strategy has been tested.The result shows that low THD (about 1.5%) with inductive loads and fast error convergence (2 fundamental periods) can be achieved by this strategy which can be demonstrated to be brief and effective.

The Impact of the Metal Interface on the Stability and Quality of a Therapeutic Fusion Protein

2020 ◽  
Author(s):  
Adrian P. Defante ◽  
Cavan K. Kalonia ◽  
Emma Keegan ◽  
Steven M. Bishop ◽  
Hasige A. Satish ◽  
...  
Keyword(s):  
Fusion Protein ◽  
Metal Interface ◽  
The Stability ◽  
The Impact

scholarly journals Improving the Usefulness of the Multidimensional Pain Inventory

2011 ◽  
Vol 16 (4) ◽  
pp. 239-244 ◽  
Author(s):  
Jeffrey M McKillop ◽  
Warren R Nielson
Keyword(s):  
Social Support ◽  
Goodness Of Fit ◽  
Self Report ◽  
Good Precision ◽  
Sample Mean ◽  
Multidimensional Pain Inventory ◽  
Pain Management Program ◽  
The Stability ◽  
The Impact

BACKGROUND: The Multidimensional Pain Inventory (MPI) is a reliable and valid self-report instrument that measures the impact of pain on an individual’s life, quality of social support and general activity. Criticism of the MPI has focused on this instrument’s internal structure and the stability of its classification taxonomy.OBJECTIVES: To determine whether empirical summary scales could be developed for the MPI based on a large sample of respondents diagnosed with fibromyalgia syndrome. It was hypothesized that summary scales would improve the psychometric quality of the MPI and increase the stability of respondents’ taxonomy profiles across time.METHODS: Respondents completed the MPI on two occasions before their admission to a multidisciplinary pain management program.RESULTS AND CONCLUSIONS: Based on principal components analysis, three summary scales were developed that reflected level of impairment, social support and activity. Summary scales possessed good psychometric qualities and, when cluster analyzed, replicated the MPI taxonomy. Exploratory analyses of the MPI taxonomy revealed that goodness-of-fit values generally became less reliable as respondent profiles approached the overall sample mean. When the relative distance between respondents fit to taxonomy profiles and the distance from the sample mean was considered, profile stability using summary scales was predicted with good precision. These results suggest that summary scales may enhance the usefulness of the MPI, and that the traditional method of determining profile fit within the MPI is not stable and needs to be reconsidered.

Feasibility study: a new way to check the stability of industrial ginning throughout the season

2017 ◽  
Vol 88 (20) ◽  
pp. 2362-2378
Author(s):  
Mamadou Togola ◽  
Jean-Paul Gourlot ◽  
Eric Gozé ◽  
Bruno Bachelier ◽  
Massa Coulibaly ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Management Practices ◽  
Seed Cotton ◽  
Harvesting Technique ◽  
The Difference ◽  
The Stability ◽  
The Impact ◽  
Production Conditions ◽  
Comparison Data

The quality of cotton fiber observed at classing depends on the production conditions (soil, variety, climate, and crop management practices, including harvesting technique) and on the ginning conditions (seed-cotton cleaning, ginning, and lint cleaning). Thus, when lint quality is monitored, variations in seed-cotton quality may be confused with the impact of variations in ginning conditions. So, rather than measuring the quality of the cotton leaving the ginning mill, we propose measuring the impact of ginning conditions on the difference in quality between a batch of cotton ginned in the mill and a sample of the same batch ginned using micro-ginning equipment. By comparing 11 industrial ginning mills with the micro-ginning equipment used as a control, this feasibility study evaluated the impact of ginning conditions in an experiment on 119 seed-cotton modules in Mali throughout the 2014–2015 season. Based on this comparison, data analysis showed that the ginning process did have an impact on cotton quality, that the impact varied with the date, and that it was only linked to ginning conditions. Conversely, no alert concerning the impact of industrial ginning conditions was issued based on the results of the evaluation of the quality of fiber samples from industrial ginning mills alone.

scholarly journals WAKTU PENYIMPANAN TROMBOSIT TERKAIT JUMLAH DI KONSENTRAT TROMBOSIT

2016 ◽  
Vol 20 (3) ◽  
pp. 224
Author(s):  
Raehana Samad ◽  
Agus Alim Abdullah ◽  
Kusriny A.P. ◽  
Mansyur Arif
Keyword(s):  
Platelet Count ◽  
Storage Time ◽  
Blood Donors ◽  
Impedance Method ◽  
Storage Process ◽  
Series Design ◽  
The Stability ◽  
The Impact

The transfusion of thrombocyte concentrate is one of the important medical approaches to make the platelet count raised in patients with thrombocytopenia. The TC could change during the storage process, so the in vitro storaging should be considered to minimalize the alterations on the platelet count. The study was aimed to know the impact of storage time to maintain the platelet count stability in TC of transfusion blood by evaluating it. A study with Time Series design was performed in 30 samples of TC of transfusion blood collected from 30 blood donors. The samples was collected from the bag tube of TC and the test is performed as soon as possible by using haematological analyzer (Sysmex KX-21) with an impedance method, the rest of the samples was stored in an agitator on 22±2°C to perform a repeated count on day 5th and 7th. The collected data was analyzed with “Paired T Test”. The results of this study showed that the platelet count in TC of transfusion blood was decreased in the fifth day compared to the first day, but the decreased matter is insignificant, statistically (p=0.13). While after seventh (7) day, the platelet count is decreased significantly (p=0.00). The researchers concluded that the storage of TC for seven (7) days could not maintain the stability of the platelet count of the transfusion blood. There fore is suggested, a further study to evaluate the impact of storage time on platelets viability. So the quality of platelets in TC of transfusion blood can be evaluated.

scholarly journals PAR Index in the Evaluation of the Stability of the Orthodontic Treatment Results. A Review

2006 ◽  
Vol 49 (4) ◽  
pp. 203-207 ◽  
Author(s):  
Chaitra Ramanathan
Keyword(s):  
Orthodontic Treatment ◽  
Treatment Results ◽  
Quality Of Work ◽  
Par Index ◽  
The Stability ◽  
The Individual ◽  
Individual Scores ◽  
The Impact

The evaluation of the treatment results is normally done to estimate the nature and quality of work, so that justice can be done to the work that we do and also that the patients will be satisfied. The primary motive of every orthodontist should be to treat the patient effectively and successfully with long lasting results. Thus the patients are to be assessed, using an appropriate method. PAR index was developed in the recent years to evaluate the treatment results and it is considered as a simple, objective and a reliable manner for evaluating the stability after orthodontic treatment. The index can be applied to different components of the dentition and scores are applied to each component after which the individual scores are multiplied with their respective weightings to balance the impact of the individual components of the overall result. They are then summed up to establish an overall total. In this manner, the method was carried out for the study casts of the three different phases of the treatment i.e. before the onset of the treatment, immediately after treatment and 2 years after treatment for assessing the stability after orthodontic treatment.

scholarly journals STABILITY OF GIRDER BRIDGE AGAINST TSUNAMI FLUID FORCE

2011 ◽  
Vol 1 (32) ◽  
pp. 56 ◽  
Author(s):  
Susumu Araki ◽  
Kazuo Ishino ◽  
Ichiro Deguchi
Keyword(s):  
Shear Stress ◽  
Solitary Wave ◽  
Added Mass ◽  
Critical Force ◽  
Fluid Force ◽  
Wave Pressure ◽  
Seaward Side ◽  
Girder Bridge ◽  
The Stability ◽  
The Impact

The horizontal and vertical components of the fluid force and pressure acting on a girder bridge due to tsunami like a solitary wave are measured in a hydraulic experiment and their characteristics are discussed. The peak of the impact fluid force is estimated on the basis of the change in the added mass of the structure. The wave pressure acting on the seaward side of the girder of the bridge is also estimated. The critical force for the stability of the girder bridge is estimated as the strength of bolts used in the shoes against shear stress.

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