Effectiveness of the running system of a wheeled vehicle

A method for quantitative assessment of the effectiveness of the running system of wheeled vehicles for the general case of curvilinear motion is proposed. An expression is obtained for calculating the coefficient of efficiency of the running system of a wheeled vehicle, taking into account the parameters of the power and steering wheel drives. The results of evaluating the effectiveness of the running system of an off-road vehicle with a wheel arrangement of 8Ѕ8 and two front steerable axles are presented. Keywords: wheeled vehicle, running system, power drive, drive wheels, steering control, effectiveness, coefficient of efficiency. [email protected]

The influence of players’ nationality on the effectiveness of eSports teams based on the example of The International DOTA 2 tournaments

The presented text addresses the issue of the influence of national diversity of eSports teams on their effectiveness in winning DOTA 2 games. The analyses were based on data concerning the entire population of teams participating in The International series tournaments. The results of the analyses confirm the hypothesis that teams with a strong national diversity, more often than teams with a high national homogeneity, achieve a high effectiveness coefficient and occupy a high place in the final classification of the analyzed tournaments.

The Development of Mathematics Student Worksheets (LKS) Based on Problem Based Learning Approach with HOTS Questions

This study aims to develop Student Worksheets with Problem Based Learning (PBL) models based on High Order Thinking Skills (HOTS) questions on the subject of Building Square and Rectangular Flat. This type of research is development research that refers to the Thiagarajan 4-D Model. Data collection techniques using expert validation techniques, learning outcomes tests and questionnaires. The results showed that the worksheets that had been developed were valid, practical and effective with the validity coefficient of worksheets being 0.89 with very high criteria. Practical coefficient reached 92% with very good category and 85% effectiveness coefficient with good category. Student responses to learning activities and components of the worksheet are positive, reaching 95% of students happy with the teaching component. Keywords: Problem Based Learning (PBL), High Order Thinking Skills (HOTS)

PROTIOKLEPNI BOJ V SLOVENSKI VOJSKI

Povzetek Od 90. let prejšnjega stoletja je v opremljanju z oklepno tehniko v oboroženih silah zaznati spremembe. Obseg tankovskih zmogljivosti se je zmanjšal, hkrati pa se povečujejo zmogljivosti tako imenovanega lahkega oklepa in oklepne zaščite v enotah bojne podpore in enotah zagotovitve bojnega delovanja. Dejansko se je delež oklepa na bojišču povečal. V doktrinarnem smislu Nato ne namenja veliko pozornosti protioklepnemu boju, v Vojaški doktrini SV (2006) pa protioklepnega boja sploh ne najdemo. V članku je opredeljen protioklepni boj v doktrinarnem smislu in analizirane so protioklepne zmogljivosti sodobnih vojsk. Na podlagi tega je predstavljenih nekaj ugotovitev in priporočil o stanju protioklepnega boja v SV. Ključne besede: Protioklepni boj, protioklepni oborožitveni sistemi, Slovenska vojska, koeficient bojne učinkovitosti. Abstract Since the 1990's, several changes have occurred in armoured formations. The scope of tank capabilities has been reduced considerably, while at the same time the presence of light armour and armour in combat support and combat service support units has increased. The percentage of armour in the battlefield has thus increased considerably. Nevertheless, doctrine-wise anti-armour combat is not a high priority for NATO and it is not even mentioned in the Slovenian Armed Forces doctrine (2006). The article deals with anti-armour combat from a doctrine perspective, and provides an analysis of anti-armour capabilities of modern armed forces. Building on this, it puts forward some conclusions and recommendations for the Slovenian Armed Forces. Key words: Anti-armour doctrine, anti-armour weapon systems, Slovenian Armed Forces, combat effectiveness coefficient.

Metrological Properties of the Test Setup for Determination Shielding Effectiveness of the Industrial Cable Connectors

The paper presents results related to assessment of the repeatability and reproducibility of the measurement test setup for determination the relative value of the shielding effectiveness coefficient of the industrial connectors. The construction of the proposed test setup, the measurement method and the procedure for the analysis of measurement results were described. To determine the value of the repeatability and reproducibility coefficient, the two–way analysis of variance was used, which additionally allows for an assessment of the influence of individual sources of variance. The measurements and their analysis were conducted for several frequencies in the range up to 1 GHz. Additionally, the expanded measurement uncertainty, including the test setup and instruments uncertainty was estimated.

Comparative study of isotherm parameters of lead biosorption by two wastes of olive-oil production

Batch isotherm studies were carried out on a laboratory scale: (i) to investigate the effectiveness to remove lead of two wastes (olive stone (OS) and olive tree pruning (OTP)), untreated and chemically treated; and (ii) to examine the applicability of various adsorption isotherms to fit the experimental data. Results from tests were analyzed using seven equilibrium isotherm correlations (Langmuir, Freundlich, Dubinin–Radushkevich, Temkin, Redlich–Peterson, Sips, and Toth equations). The sum of the squares of the errors was determined for each isotherm and the Langmuir equation provided the best fit. Chemical treatments increased the biosorption properties of these materials. The maximum biosorption capacities were: 6.33, 49.13, 14.83, and 38.93 mg g−1 for untreated OS, HNO3-OS, H2SO4-OS, and NaOH-OS, respectively, and 26.72, 86.40, 72.78, and 123.80 mg g−1 for untreated OTP, HNO3-OTP, H2SO4-OTP, and NaOH-OTP, respectively. Finally, the loss of mass for each waste (13.9, 14.3, and 36.8% for HNO3-OS, H2SO4-OS, and NaOH-OS and 35.1, 27.5, and 46.7% for HNO3-OTP, H2SO4-OTP, and NaOH-OTP, respectively) was taken into account and an effectiveness coefficient was determined for each adsorbent material.

Numerical Analysis on Protective Effectiveness of Composite Blast Walls against Blast Wave

For the comparative analysis of composite blast walls on the protective effects of blast wave, Overpressure protective effectiveness coefficient was put forward to analyze protective effectiveness and . It was studied that Protective effectiveness of composite blast walls under blast waves using 3D numerical simulation method and analysis of the amount of drugs, explosive distance, height and other structural parameters on protective effect of composite structures. The influence of several factors on forecasting formula was analyzed, such as scaled blast distance and scaled height of wall. Via fitting the simulation results overpressure formula of the back of composite blast walls was obtained. The result indicate that protective effectiveness of composite structure increases when walls height increases or scaled blast distance decreases.

Comparative analysis of the theoretical models of ideal propulsor, ideal fluid brake, ideal screw propeller and ideal axial wind turbine

The article presents a detailed discussion of the theoretical models of four different fluid dynamic devices: an ideal propulsor, an ideal fluid brake, an ideal screw propeller and an ideal turbine. The four models are presented with all relevant mathematical formulae regarding the forces, the power and the efficiency. It is demonstrated that the application of the model of an ideal optimum fluid brake according to the Betz theorem for determination of the maximum effectiveness coefficient of an axial wind turbine is not correct. In the case of a turbine the inclusion of important rotational flow losses may increase the maximum value of the turbine effectiveness coefficient above the level defined by Betz. Therefore the model of an ideal turbine should be an inversion of the model of an ideal screw propeller. This conclusion is supported by numerical calculations. It may influence the design procedures of wind turbines and may lead to increase in their efficiency.

Pengaruh Kompetensi dan Pelaksanaan Audit Internal dalam Menunjang Efektifitas Pengendalian Internal Penjualan

PT Inti Dufree Promosindo is a subsidiary of PT Sona Topas Tourism Industry, Tbk. The company is one of the biggest retail companies that sell local and imported products. This business is also called duty free shop. PT. Inti Dufree Promosindo have problems in evaluate the infuence of the effectiveness of its internal audit function towards sales internal control due to large number of sales transactions occurred. The research result shows that the auditor competence and audit process variable have low but significant influence to sales internal control effectiveness (Coefficient determination 22.7%), and so that the audit process variable that have low but significant influence to sales internal control effectiveness (Coefficient determination 36.8%). However, the combination of the two variables tested with linear regression shows that both variables simultaneously have strong influence to sales internal control effectiveness. Based on the result of multiple linier regression analysis the determination coefficient is 47, 4%. This shows that auditor competence and audit process simultaneously have a significant effect in supporting internal sales control effectiveness.

Gas diffusion and air-filled porosity: Effect of some oversize fragments in growing media

Large particles are often added to growing media to improve air-filled porosity, an often-reported growth-limiting factor. Previous studies have shown that large fragments can leave air-filled porosity unchanged and actually decrease the air exchange characteristics in peat:bark and pure peat media, with an adverse effect on plant growth. Thirteen different growing mixes composed of perlite, bark, peat, sand, rockwool, wood and coco fibre, in which the size of the larger fractions was varied, were tested. Air-filled porosity, easily available water, pore effectiveness coefficient, and diffusivity were examined in these mixes. Air-filled porosity was found to be the highest in mixes where the largest fraction was composed of coarser particles. Pore effectiveness coefficient was found to decrease with the increasing coarseness of the largest fractions. Gas diffusivity was found to be highest when intermediate (2–4 mm) fragments were used as the largest fraction of the mixes. These findings applied to impermeable, disk- or spherically shaped, coarse fragments (perlite, coco hulls, bark), but did not apply to threadlike coarse material (wood fibres). Gas diffusivity values (at a water potential of −0.75 kPa) obtained for rockwool, the peat:bark mix containing 2- to 4-mm bark particles, the peat:medium wood fibre mix, the peat:fine perlite (0.8–2 mm) mix and the pure fine coconut medium were not statistically different one from another. Air-filled porosity was negatively correlated to the fractions less than 1 mm, between 0 and 0.2 mm and between 0.2 and 0.8 mm. Easily available water, pore effectiveness coefficient and gas diffusivity were not correlated to particle size distribution, indicating that these properties cannot be estimated based on particle size and must instead be measured directly. Key words: Aetion, peat substrates, perlite, bark, available water