DIAGNOSTICS OF ROLLING EQUIPMENT SLIDING BEARINGS

Peculiarities of rolling bearings operation are analyzed. Methods of diagnostics of general purpose sliding bearings and rolling equipment are considered. Direct control of the maximum allowable wear of plain bearings during operation is proposed. It is advisable to provide remote information and consulting services to technical services of metallurgical enterprises for maintenance, repair and operation of crankshaft bearings. Bearings of electric machines of drives of rolls of rolling mills work in extremely difficult conditions with considerable overloads in the environment of the increased vibration. This leads to premature wear of the liner and its fatigue failure. The technical condition of bearings of electric machines of drives of rolls of rolling mills for the purpose of an exception of an emergency stop of production is carried out by indirect control of temperature and vibration. However, these controls do not guarantee an avoidance of an emergency. All problems with working plain bearings can be grouped into three groups: insufficient bearing capacity of the lubricating layer, unregulated clearance between the shaft and the liner, unsatisfactory technical condition of the bearing surfaces. Insufficient bearing capacity of the lubricating layer is more often associated with loss of lubricant properties due to improper maintenance of the lubrication system. The discrepancy between the size of the gap between the shaft and the liner to the normalized value arises from design, technological and operational reasons. Key words: plain bearing; failure; rolling equipment; direct wear control; remote information and consulting services

Kings of Chaldea and Sons of Nobodies: Assyrian Engagement with Chaldea and the Emergence of Chaldean Power in Babylonia

From the ninth century until the last quarter of the seventh century BCE, the Assyrian Empire first extended its power over Babylonia and then engaged in a prolonged effort to retain control. The patchwork nature of Babylonian society—divided as it was between the traditional urban centers, territories controlled by five distinct Chaldean tribes, and regions inhabited by Aramaean tribes—presented opportunities and challenges for Assyria as it sought to assert its dominance. Assyrian interactions with the Chaldean tribes of Babylonia redefined the Chaldeans’ place within power relationships in southern Mesopotamia. Starting in 878, Assyria first perceived Chaldean territory as distinct from what they defined as Karduniaš, the land ruled by the king of Babylon. Shalmaneser III exploited and accentuated this division by recognizing the Chaldean leaders as kings and accepting their tribute even as he concluded a treaty with the Babylonian king, Marduk-zakir-shumi I. By decentralizing power in Babylonia, Assyria was able to assert indirect control over Babylonia. However, periods of Assyrian weakness created opportunities for several Chaldeans—drawing upon the economic and military power they could muster—to claim the title of king of Babylon with all the accompanying ideological power. These new developments prompted Assyria under the Sargonids to create counter-narratives that questioned the legitimacy of Chaldeans as kings of Babylon by presenting them as strange and inimical to the Assyrian order even as Assyrian interactions with the Chaldeans improved Assyrian familiarity with them.

The Role of State Mobilization for Volunteerism in China

Research on China’s volunteerism highlights the state as a major force in mobilizing volunteer participation. Nevertheless, limited quantitative research exists documenting the extent to which Chinese volunteers are connected to the state system. Using a nationally representative dataset, the 2012 Chinese General Social Survey, this study examines how an individual’s employment affiliation with state-controlled institutions influences their probability to volunteer. The results show that the Chinese government not only directly mobilizes employees of the state system to volunteer but also has significant influence over the general population’s volunteering. This influence is mainly through the existence of Chinese Communist Party chapters in every corner of society, as well as the state’s direct and indirect control over social organizations that organize volunteer activities. We thus question the extent to which volunteerism in China is truly voluntary and call for more critical analysis of this issue.

Optimal Portfolio Selection Methodology for a Demand Response Aggregator

This paper presents a methodology for determining the optimal portfolio allocation for a demand response aggregator. The formulation is based on Day-Ahead electricity prices, in which the aggregator coordinates a set of residential consumers that are recruited through contracts. Four types of contracts are analyzed, considering both direct and indirect demand response programs. The objective is to compare different scenarios for contract portfolios in order to establish the benefits of each market agent. An optimization problem is formulated to capture the interactions between the aggregator and end consumers. The model is formulated as a mathematical program with equilibrium constraints: At the upper level, the aggregator maximizes its benefits, whereas the lower level represents the consumers’ contracts. By applying the developed methodology, the characterization of the consumers’ behavior is established in order to forecast their responses to the generation of punctual incentives, both for usual scenarios and peak events, as well as to evaluate the impact that direct and indirect control contracts have on the performance of the aggregator as the energy price varies.

Sistem Pengaturan Pulse Width Modulation Motor Pada Robot Pembawa Makanan atau Minuman Menggunakan Joystick

Teknologi robotika kini sudah semakin berkembang pesat, hal ini ditunjukkan banyak sekali penggunaan teknologi robot yang digunakan dalam kehidupan sehari-hari untuk membantu pekerjaan manusia. Robot pengantar makanan atau minuman juga menjadi salah satu teknologi robotika yang kini semakin marak dikembangkan. Banyak peneliti yang sudah mulai mengembangkan robot sebagai alat pembantu pekerjaan manusia untuk pengantar makanan dan minuman. Pada robot tersebut, proses untuk mengatur kecepatan roda penggeraknya dapat menggunakan kontrol langsung atau kontrol tidak langsung. Pada penelitian ini, pengontrolan secara tidak langsung dilakukan menggunakan joystick untuk mengatur masukan pulse width modulation yang kemudian dikonversikan menjadi kecepatan robot. Pengaturan ini dibantu dengan mikrokontorller ATMEGA 328P sebagai alat untuk komputasi dan eksekusi jari program. Sehingga kecepatan robot dapat diatur dengan sempurna. Berdasarkan hasil pengujian diperoleh bahwa perubahan PWM awal pada saat robot dari kondisi diam menuju berjalan dengan perubahan kecepatan yang linier terhadap perubahan sinyal analog dari joystick, sehingga pergerakan robot lebih stabil. Nowdays, robotics was growing rapidly, it is widely used in everyday life to help human work. Food or beverage delivery robots are also one of the robotics technologies that are increasingly being developed today. Many developers has started to develop food or beverage delivery robots. In order to adjust the speed of the robots, we can use direct or indirect control. This study uses indirect control using joystick as a regulator of pulse width modulation which is converted to robot speed. Furthermore,, we used ATMEGA 328P microcontroller for computing and finger execution of the program. So that the speed of the robot can be adjusted perfectly. The result show that the initial PWM changes when the position of robot is rest to walking has linear change in speed to changes in the analog signal from the joystick, so that the robot's movement is more stable.

Headlines against Democracy: Operational Code Analysis of the Serbian Daily Informer’s Headlines in Relation to the Anti-Government Protests’ First Phase (2018–2019)

Since late 2019, Serbia has been gripped in a wave of protests against, as scholarly research has dubbed it, the semi-authoritarian regime of President Aleksandar Vučić. Having in mind that the President’s regime has by known been uncovered to rule by direct and indirect control of the media, the arguably main government-supporting daily newspaper, the Informer, has been covering the protests avidly, and with significant vitriol. With the understanding a headline is seen by the reader more commonly than the whole body of the article and having in mind the Informer’s pro-clivity towards exaggeration and hyperbole, we have analyzed all of the daily’s headlines that refer to the protests, protesters, or protest/opposition leaders during the so-called ‘First phase of the protests’ via the methodo-logical position of Operational Code Analysis. The paper shows a fairly extreme OPCODE for the Informer.

Between automation and gamification: forms of labour control on crowdwork platforms

Algorithmic management is a core concept to analyse labour control on online labour platforms. It runs the risk, however, of oversimplifying the existing variety and complexity of control forms. In order to provide a basis for further research, this article develops a typology of labour control forms within crowdwork and discusses how they influence perceptions of working conditions. It identifies the two most relevant forms of labour control in crowdwork: direct control mainly takes the form of automated output control, while indirect control aiming at creating motivation and commitment is mainly exerted through ranking and reputation systems (gamification). The article shows that these forms of control and their combination are linked with very different ways of how platform workers perceive working conditions on platforms. In addition, the analysis shows significant differences regarding the perception of working conditions between those who work on platforms in addition to a regular employment as opposed to those who are self-employed and rely more strongly, if not fully, on their income from platform work. The analysis is based on qualitative and quantitative research on crowdwork platforms. In particular, it builds on an online survey conducted with 1,131 crowdworkers active on different types of platforms.

Newly fault-tolerant indirect vector control for traction inverter

<p>The traction inverter is a crucial power device in the electric vehicle’s powertrain, and its failure is intolerable as it would considerably compromise the system’s safety. For more reliable driving, installing a traction inverter that is sufficiently resistant to electrical failure is inherent. Due to its compact size and the small number of switches incorporated in three-phase four-switch inverter, this modular topology was used to compensate for the open switch’s failure. However, it is known to have manifold weaknesses mainly distinguished in the low-frequency region. This paper introduces a new fault-tolerant indirect control that handles the IGBT’s failure constituting the traction inverter. The fault compensator is designed first based on the Proportional Integral regulator combined with the notch filter to mitigate the current imbalance and restore the DC voltage equilibrium.Furthermore, to conceive a comprehensive fault-tolerant control, there must therefore contain an accurate fault detector. In this regard, an uncomplicated fault diagnosis method based on the current spectral analysis has been performed. The effectiveness of the submitted controller was validated by simulation using Matlab.</p>

INDIRECT JUDICIAL CONTROL OVER THE LEGALITY OF ADMINISTRATIVE ACTS

Indirect judicial control over the legality of administrative acts within the framework of which the court considers civil law claim whilst evaluates the legality of an administrative act with a missed deadline of direct retrial, is one of the most pressing and unresolved problems of civil and administrative law interplay. The permissibility of indirect judicial control over legally binding administrative acts generates inter-branch conflicts, ‘divergent legal implications’ that have negative impact both on the citizen, when his conduct, permitted by an administrative procedure, entails civil legal sanctions, and on the administrative body, since the civil law practice is a means of “invasion” into its competence to assess the circumstances of the case and make decisions in a particular managerial situation1. The approach of not accepting the binding nature of an administrative act which has legal force, established in the Russian legal system for the court considering a civil case, is perceived as an axiom that does not require proof. However, looking at the problem of binding nature of an administrative act through the prism of the German concept of legal force of administrative acts allows us to question the validity and effectiveness of this axiom for modern civil and public circulation. In German legal system indirect control over the legality of legally binding administrative acts is not possible, such acts are considered obligatory for the courts, with the exception of acts that are null. Thus, the limits of indirect judicial control over the legality of administrative acts are placed in their legal force, and the very concept of the legal force of administrative acts must be built on the grounds of harmonization of the underlying interactive principles: legality, legal certainty, protection of trust.