scholarly journals ANALISA KERUSAKAN HIDROLIK BOOM CYLINDER EXCAVATOR KOMATSU PC200-8 DENGAN MENGGUNAKAN METODE FMEA

2021 ◽  
Vol 5 (1) ◽  
pp. 8
Author(s):  
Iskandar Iskandar ◽  
Adi Saputra Ismy ◽  
Sariyusda Sariyusda ◽  
Darmein Darmein ◽  
Zaini Zaini
Keyword(s):  
Inner Parts

Boom cylinder merupakan salah satu komponen dari front attachment excavator. Komponen ini berfungsi menggerakkan bucket dalam posisi maksimal dengan memanfaatkan oli hidrolik. Boom cylinder akan mengalami penurunan performa kerja jika terdapat masalah dan kerusakan pada inner-parts nya. Gangguan kinerja pada komponen boom cylinder dapat disebabkan oleh beberapa factor, diantaranya kontaminasi yang terjadi komponen boom cylinder, terjadinya kebocoran internal ataupun eksternal, serta terjadinya overhead pada bagian komponen dari boom cylinder . Faktor-faktor tersebut dapat menurunkan daya kerja pada komponen boom cylinder. Sedangkan penyebab kerusakan pada boom cylinder sangat beraneka ragam, hal ini dapat terjadi karena factor-faktor tertentu, diantaranya pada pemakaian unit oleh operator, medan kerja yang curam dan banyak factor penentu lainnya yang mendasari kerusakan pada komponen boom cylinder ini. Masalah kerusakan pada cylinder boon tersebut dapat dikurangi dengan penanganan yang benar, yaitu dengan perawatan yang tepat pada setiap komponen,penyesuaian kapasitas kerja dan menjaga kebersihan oli hidrolik pada sistem.Kata kunci : Hidrolik Boom Cylinder, Bucket

Three-dimensional reconstruction of the stacked-disk aggregate of tobacco mosaic virus protein from electron micrographs

1971 ◽  
Vol 261 (837) ◽  
pp. 211-219 ◽  
Keyword(s):  
Electron Microscope ◽  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Virus Protein ◽  
Protein Subunits ◽  
Microscope Images ◽  
Dimensional Reconstruction ◽  
Inner Parts

The three-dimensional structure of the stacked-disk rod of tobacco mosaic virus protein has been reconstructed to a resolution of about 2 nm from electron microscope images. Closed rings of seventeen protein subunits (compared with 16 ⅓ in one turn of the virus helix) are stacked in polar fashion, the stacking being accompanied by an axial perturbation of periodicity 5.3 nm connecting successive pairs of rings into disks. The axial perturbation consists of a movement towards each other of the outer parts of the subunits in the two rings comprising a disk, together with a movement of the inner parts in the opposite direction. This could be explained either by a bending of parts of the subunits in the appropriate directions or by a bodily tilting of the subunits in the two rings in opposite directions.

The Coronal Solar Magnetism Observatory

2017 ◽  
Vol 13 (S335) ◽  
pp. 359-361 ◽  
Author(s):  
Michael J. Thompson ◽  
Steven Tomczyk ◽  
Sarah E. Gibson ◽  
Scott W. McIntosh ◽  
Enrico Landi
Keyword(s):  
Solar Observatory ◽  
Field Of View ◽  
Preliminary Design ◽  
Research Facility ◽  
Plasma Properties ◽  
Design Review ◽  
Mauna Loa ◽  
Solar Magnetism ◽  
New Facility ◽  
Inner Parts

AbstractThe Coronal Solar Magnetism Observatory (CoSMO) is a proposed new facility led by the High Altitude Observatory and a consortium of partners to measure magnetic field and plasma properties in a large (one degree) field of view extending down to the inner parts of the solar corona. CoSMO is intended as a research facility that will advance the understanding and prediction of space weather. The instrumentation elements of CoSMO are: a white-light coronagraph (KCor), already operational at the Mauna Loa Solar Observatory (MLSO); the Chromosphere and Prominence Magnetometer (ChroMag), due for deployment to MLSO next year; and the CoSMO Large Coronagraph (LC) which has completed Preliminary Design Review.

scholarly journals The MAGNUM survey: a high-resolution study of the complex nuclear environment of local Seyfert galaxies

2019 ◽  
pp. 159-172
Author(s):  
M. Mingozzi ◽  
G. Venturi ◽  
F. Mannucci ◽  
A. Marconi ◽  
G. Cresci
Keyword(s):  
Seyfert Galaxies ◽  
Analysis Techniques ◽  
Central Regions ◽  
Galaxy Disk ◽  
Nuclear Environment ◽  
Physical Effects ◽  
Integral Field Spectrograph ◽  
Inner Parts ◽  
Integral Field ◽  
Extract Information

The central regions of Seyfert galaxies, comprising broad and narrow line regions and the inner parts of galaxy disk and bulge, is characterized by a complex interplay among many physical effects. Specifically, it is shaped by the influence of the central black hole, producing ionization by an hard continuum and gas outflows. The integral-field spectrograph MUSE at the ESO VLT allows to carry out a detailed study of these regions to obtain their ionization, dynamical, and metallicity properties. Here we present some highlights of the MAGNUM survey which is designed to study the central regions of a sample of nearby (D > 500 pc) Seyfert galaxies. We describe the rationale of the survey, the data analysis techniques used to extract information on ionization and dynamics, and the results for one galaxy, Centaurus A.

scholarly journals Increased stability die forged steel 4H4N5M4

2020 ◽  
Vol 96 (4) ◽  
pp. 30-38
Author(s):  
O. M. Sydorchuk ◽  
◽  
L. A. Myroniuk ◽  
D. V. Myroniuk ◽  
K. O. Gogaev ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Physical And Mechanical Properties ◽  
Cast State ◽  
H13 Steel ◽  
Die Steel ◽  
Lower Heat ◽  
Full Annealing ◽  
Processing Optimization ◽  
Inner Parts ◽  
Steel Heat

The results of researches on steel 4H4N5M4F2 modes thermo-deformation processing optimization are given. It is established that incomplete annealing (750 °С ± 20 °С in comparison with full annealing 860 °С) in cast and forged condition promotes to improve the machining of blanks for the manufacture of matrices. It is shown that the use of incomplete annealing, namely partial recrystallization promotes the formation of spheroidized rather than lamellar carbide phase, which leads to a decrease in the characteristics: strength threshold, yield strength, hardness 900 MPa, 800 MPa, 32 33 HRC in the cast state and 1200 MPa, 1050 MPa, 38 39 HRC in forged condition, respectively. This increases the fracture toughness: 180 J/cm2 in the cast state and 130 J/cm2 in the forged state. The optimized mode of forging at the temperature of 1170 ± 20 °С and heat treatment (hardening at 1100 ± 5 °С and tempering at 595 ± 5 °С) of steel 4H4N5M4F2 allowed to increase impact strength five times in comparison with cast experimental steel, and also to increase strength threshold of 100 MPa. Forged steel 4H4N5M4F2 has slightly lower heat resistance compared to cast, which hardens at temperatures above 630 °C during operation of the die steel tool. After operation of the extruder wheels made of investigated forged steel and forged steel 4H5MF1S, which was used at the enterprise in copper processing, the properties of both steels were determined. The investigated forged steel 4H4N5M4F2 is characterized by an increase in the strength threshold by 200 MPa and hardness by 6 HRC. After operation (production of 60 tons of copper products of M1 grade) the tool (wheel extruder) from H13 steel (analog 4H5MF1S) had micro and macrocracks on the side and inner parts, and in the investigated steel 4H4N5M4F2 such defects were absent. Thus, the studied steel is characterized by increased stability. Keywords: steel, heat treatment, forging, structure, physical and mechanical properties.

scholarly journals Comparative Analysis of Structure-From-Motion Software’s –An Example of Letychiv (Ukraine) Castle and Convent Buildings

2018 ◽  
Vol 8 (2) ◽  
pp. 73-78
Author(s):  
P. Lewińska ◽  
K. Pargieła
Keyword(s):  
Structure From Motion ◽  
Large Population ◽  
Second World War ◽  
World War ◽  
Current State ◽  
Historical Objects ◽  
The Town ◽  
Second World ◽  
The Church ◽  
Inner Parts

Abstract Letychiv (pl. Latyczów) is a town located in central Ukraine in the Khmelnytskyi Oblast. It has a unique and complicated history. Second World War left it in ruin, destroying buildings, infrastructure and decimating its once large population. Perhaps the most prominent part of the town currently is the building Dominican convent with adjoin Letychiv Assumption Church. This object is surrounded by what is left of the previously impressive Letychiv Castle, founded by Jan Potocki in 1598. Past 30 years have been dedicated by this small Catholic parish towards rebuilding monastery-castle-church complex. Since this is an ongoing project, it was decided to perform a photographic inventory of the current state of the construction and to create a 3D digital model of the castle, facade of the church and monastery, and the altar. This task have proven to be difficult due to complicated structure of the object. Facades and inner parts of the church are almost white with limited number of distinctive elements, painted in pail gold. Elements other than white are almost identical to each other. It leads to various errors in the processing of Structure-from-motion. This article describes how various versions of SfM algorithm work thru mention difficulties, compares results in terms of accuracy, level of detail and overall look. It also describes how SfM can help to document various stages of restoration of important historical objects.

scholarly journals Stars and gas in the inner parts of galaxies seen in SAURON integral field observations

2007 ◽  
Vol 51 (1-2) ◽  
pp. 29-33 ◽  
Author(s):  
R.F. Peletier ◽  
K. Fathi ◽  
E.L. Allard ◽  
J.H. Knapen ◽  
M. Sarzi ◽  
...  
Keyword(s):  
Field Observations ◽  
Inner Parts ◽  
Integral Field

scholarly journals Gaseous response to bar-like distortions

1979 ◽  
Vol 84 ◽  
pp. 175-186
Author(s):  
William W. Roberts
Keyword(s):  
Steady State ◽  
Large Scale ◽  
Disk Galaxy ◽  
Inner Parts

In this review the large-scale dynamics of the gas in a model disk galaxy which has an oval, bar-like distortion (or bar structure) in the inner parts is reviewed from the standpoint of recent gas dynamical studies, both steady state and time evolutionary.

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