FEATURES OF INSPECTION OF RING WELDED CONNECTIONS OF PIPE ELEMENTS BY CHARGING TYPE CONVERTERS

The article presents the results of an experimental study of the features of ultrasonic testing when adjusting the sensitivity with chord-type transducers. The unevenness of the control sensitivity in the direction perpendicular to the welded joint of the pipe element is shown. At a distance of 4…5 mm from the center of the weld, the reduction is 12…15 dB. In order to ensure reliable detection of discontinuities, it is proposed to scan perpendicular to the welded joint with the simultaneous movement of the chordal probe along the seam. The scanning parameters have been calculated. A corresponding instruction for ultrasonic testing of circular butt welded joints of pipe elements has been developed. The instruction describes the testing process with scanning of welded joints by chord type probes. Sensitivity adjustment is provided at a flat-bottomed reflector. A probe is placed on the border of the nearseam zone of the welded and moved perpendicular to the seam to the rear distance from the seam, shifted along the seam, taking into account the step to the seam to a position close to the seam, the probe is again shifted by a compression step, etc. Instruction is intended for ultrasonic testing of circular butt welded joints of 32´4 pipe elements; 42´4.5; 36´6; 60´6 and 108´6 mm.

Social Mobility Patterns in the World's Populated Cities Through COVID-19

Objective: identify social mobility patterns in the world's most populated cities from the ravaging pandemic of COVID-19 and the confinement and social distancing measures. Method: ternary diagrams to examine the simultaneous movement to different places (grocery, services, parks, workplaces, residence, and transit). Specifically, we use crosshair ternary plots and a Gaussian Kernel Density Estimator (KDE) for ternary density diagrams. Results: for the most part, the mobility reduction was between 40% and 60% in the selected cities. Nevertheless, there were more significant transit cases, but not workplaces or residences, suggesting that the informal market may absorb part of the labor work. Limitations and implications: the main limitation of this analysis is in scaling the data since the mobility statistics represent negative percentages. Main contribution: the work's principal contribution and originality lie in using ternary diagrams, allowing the identification of social mobility patterns in the largest cities and understanding how displacement of populations has changed since COVID-19.

A Two-Stage Path Planning Method for the Rearrangement Problem in Modular Puzzle-Based Storage System

The modular puzzle-based storage system consists of multiple storage modules. The system has multiple input/output (IO) points which can simultaneously deal with multiple orders in one batch. When a batch of orders comes in advance, it is necessary to rearrange the items near each IO point to reduce the picking time of customers. To complete the rearrangement quickly, this paper proposes a two-stage path planning method considering the simultaneous movement of multiple items. This method includes two stages: planning single moves and merging single moves. In the first stage, the sequence of single moves of each module needs to be obtained so as to convert the system from an initial state to a target state. In the second stage, the single moves in the sequence are merged into block moves and parallel moves to reduce the steps of movement. The simulation results show that the single move planning method can be used to solve the rearrangement problem stably and effectively and that the single move merging method can greatly optimize the experimental results with the optimization rate more than 50% in different configurations.

Experimental research of modes of movement of manipulator crane with load at combination of movements

In order to increase the productivity and reliability of a hydraulic-powered loader crane, according to the normative-technical documentation regulating the safe operation of multi-link cranes, it is allowed to combine movements with the simultaneous movement of several links of the boom system. As a result, the paper considers a technique for conducting experimental studies in the plane of changing the boom system of a loader crane with a load. Experimental studies were carried out under the condition of simultaneous angular movement of the jib and a decrease in the linear movement of the telescopic section. To carry out experimental studies, an experimental installation of a hydraulic-driven loader crane was designed and manufactured. Measuring and recording equipment has been selected and adjusted. In the framework of experimental studies of the dynamics of movement of the boom system of a loader crane with a load, a control system for drive mechanisms has been developed, which makes it possible to realize the optimal modes of movement of the links of the boom system. As a result, experimental studies were carried out under the condition of the simultaneous movement of the jib and the telescopic section with a load at the end of the boom system. A package of data on real and optimal modes of movement of the links of the boom system of the loader crane was received. The processed data are presented in graphical form and a comparative analysis with real and optimal modes of movement is carried out. The developed method of experimental research has made it possible to determine the effect of the simultaneous movement of the boom and jib on the oscillations of the load, and the effect of the oscillations of the load on the dynamic loads arising in the boom system and the drive mechanisms of the loader crane.

Simultaneous Events, Parallel Themes, Spatial Oppositions: A Comparative Content Analysis of Traditional Dance

This paper focuses on the smallest units and micro-structures of traditional dance. I propose a new approach that ventures beyond the identification of simple syntagmatic relations derived from the temporal succession of movements: a former practice of dance analyses that relied on theories borrowed from linguistics and music. The following discussion, based on the analysis of movement content as spatial change, demonstrates the existence of independent but simultaneous movement events in dance: each event possesses an expressive potential and the capacity for performance as a single rhythmical unit. Identifying events creates the possibility of separating parallel running, autonomous movement themes. Amongst the examined structures, an exceptional one, here termed contrakinesis, emerges, which represents spatial opposition as a recurring, characteristic phenomenon in East Central European traditional dance. The theory of simultaneous events and parallel themes reveals that concepts of expression in traditional dance can be comprehensively recognized only through a content-oriented exploration relying on movement analysis: an approach derived from investigating the dance itself.

Stitchless support-free 3D printing of free-form micromechanical structures with feature size on-demand

Femtosecond laser based 3D nanolithography is a powerful tool for fabricating various functional micro- and nano-objects. In this work we present several advances needed to push it from the laboratory level use to the industrial production lines. First, linear stage and galvo-scanners synchronization is employed to produce stitch-free mm-sized structures. Furthermore, it is shown that by varying objective numerical apertures (NA) from 1.4 NA to 0.45 NA, voxel size can be tuned in the range from sub μm to tens of mm, resulting in structuring rates between 1809 μm3/s and 313312 μm3/s at 1 cm/s translation velocity achieved via simultaneous movement of linear stages and scanners. Discovered voxel/throughput scaling peculiarities show good agreement to ones acquired with numerical modeling. Furthermore, support-free 3D printing of complex structures is demonstrated. It is achieved by choosing pre-polymer that is in hard gel form during laser writing and acts as a dissolvable support during manufacturing. All of this is combined to fabricate micromechanical structures. First, 1:40 aspect ratio cantilever and 1.5 mm diameter single-helix spring capable of sustaining extreme deformations for prolonged movement times (up to 10000 deformation cycles) are shown. Then, free-movable highly articulated intertwined micromechanical spider and squids (overall size up to 10 mm) are printed and their movement is tested. The presented results are discussed in the broader sense, touching on the stitching/throughput dilemma and comparing it to the standard microstereolithography. It is shown where multiphoton polymerization can outpace standard stereolithography in terms of throughput while still maintaining superior resolution and higher degree of freedom in terms of printable geometries.

Effect of infrastructure development in the program of simultaneous movement for village development on economic growth

The Regency of Tulang Bawang develops a program called Simultaneous Movement for Village Development (Gerakan Serentak Membangun Kampung), that is a movement carried out by, from, and for the community of Tulang Bawang to do the right thing together in an effort to accelerate the development of village infrastructure for economic development of village community. Infrastructure limitation leads to the high poverty rate in rural areas. The study of Simultaneous Movement for Village Development Program or Gerakan Serentak Membangun Kampung (GSMK) aims to assess the effect of Direct Cash Transfer for Community (BLM, Dana Bantuan Langsung Masyarakat), and community initiative in GSMK Program on the economic growth of the community in Tulang Bawang Regency. The type of research applied was quantitative research using multiple regression analysis. This study was conducted using secondary data in 2011-2016 sourced from Lampung dalam angka, the result of previous studies, and other supporting data. Moreover, the data required in this study included the total amount of BLM and community initiative in the GSMK Program conducted in Tulang Bawang Regency, and community initiative. The study conducted in Tulang Bawang Regency showed that: (1) There was significant correlation between Direct Cas Transfer for Community and Community Initiative on Economic Growth Rate of Community; (2) Direct Cash Transfer for Community significantly affected the Gross Regional Domestic Product (PDRB)at confidence level of 99%, and(3) Community Initiative did not significantly affect economic growth rate of community since confidence level only reached a value of 11.5%.

Route planning methods for a modular warehouse system

In this study, procedures are presented that can be used to determine the routes of the packages transported within a modular storage system. The problem is a variant of robot motion planning problem. The structures of the procedures are developed in three steps for the simultaneous movement of multiple unit-sized packages in a modular warehouse. The proposed heuristic methods consist of route planning, tagging, and main control components. In order to demonstrate the solution performance of the methods, various experiments were conducted with different data sets and the solution times and qualities of the proposed methods were compared with previous studies. It was found that the proposed methods provide better solutions when taking the number of steps and solution time into consideration.