scholarly journals Evolution of a dense outer protective tube layer in serpulids (Polychaeta, Annelida)

2011 ◽  
Author(s):  
Olev VINN ◽  
Elena K. KUPRIYANOVA
Keyword(s):  
Protective Tube

A Research on Key Technology in Overturn-Preventing of Longxi Tower’s Monolithic Movement

2014 ◽  
Vol 548-549 ◽  
pp. 1810-1814
Author(s):  
Dong Fan Shang ◽  
Tie Cheng Wang ◽  
Zhi Feng Yang
Keyword(s):  
Reinforced Concrete ◽  
Safety Factor ◽  
Support System ◽  
Time Shift ◽  
Protection Measures ◽  
Key Technology ◽  
Base Area ◽  
Protective Tube ◽  
Small Base ◽  
First Time

Longxi Tower is the first time shift of pagoda relics in China. All the following factors increase the difficulty of the shift: long years’ construction, serious aging of its structure, poor integrity, small base area and great height. In the process, we used steel initiative urging support system and reinforced concrete protective tube for Longxi Tower’s reinforcement protection, so as to form a stable entirety. Compared to no protection measures, overturn-preventing calculations and further reinforce protection measures improved the safety factor 6.0 times, thus greatly improving the overturn-preventing ability of Longxi Tower.

Diagnostics of Aluminum Alloys Melting Temperature in High Pressure Casting

2015 ◽  
Vol 669 ◽  
pp. 110-117 ◽  
Author(s):  
Ján Dubják ◽  
Ján Piteľ ◽  
Mária Tóthová
Keyword(s):  
High Pressure ◽  
Casting Process ◽  
Pressure Casting ◽  
Correct Process ◽  
Microsoft Excel ◽  
Type K ◽  
Protective Tube ◽  
Exact Measurement ◽  
True Values

The high pressure casting process is a well-established way for the manufacture of non-ferrous components. Temperature is important technological parameter of production that affects the structure and quality of castings. Using continual exact measurement of alloy temperature is the best approach for predicting structures quality problems.Temperature measurement system also would help to acquire feedback from the manufacturing process so as to prevent possible defects in next phases of manufacturing. For this measurement we used thermocouple type „K“ in protective tube from graphite. It is necessary for correct process to know true values of temperature. For diagnostics we used procedures of SPC (StatisticalProcess Control) and Microsoft Excel 2007 graphic tools.

scholarly journals DEVELOPMENT AND INDUSTRIAL TESTING OF THE SYSTEM OF SLAG CUT-OFF AT STEEL CASTING PROCESS

2019 ◽  
Vol 62 (5) ◽  
pp. 353-359
Author(s):  
Yu. I. Eremenko ◽  
D. A. Poleshchenko
Keyword(s):  
Steel Casting ◽  
Casting Process ◽  
Energy Calculation ◽  
Vibration Acceleration ◽  
Acceleration Signal ◽  
Protective Tube ◽  
The Moment ◽  
To Receive ◽  
Selection Of ◽  
Manual Mode

The authors have analyzed the existing approaches to solve a problem of determining the moment of slag outcome beginning during steel casting from a ladle to a tundish. The solution of this problem is considered in two aspects: the first is the choice of best way to generate a diagnostic signal from the position of the price/quality ratio of its handling, and the second is the development of a method to process this signal in order to obtain useful information. A scheme is proposed to receive a signal of vibration acceleration from a sensor installed on a manipulator of the ladle protective tube. A product sample is developed to arrange that. It provides protection from the influence of industrial disturbances on the sensor. In order to analyze the vibration acceleration signal, the criteria to determine the moment of the slag outcome beginning were determined based on entropy energy calculation. This method and a system developed on its basis are tested under industrial conditions for a real object. The only condition for effective operation of the developed criteria is selection of the subsystem of steel level maintenance at final casting step to the manual mode to eliminate the disturbances from the movement of the slide shutter used to control the flow of liquid steel. According to the results of experiments under real conditions, it was found that the slide shutter control shutdown is to be performed if weight of the ladle content is from 18 to 19 tons approximately. In this mode of operation, the operator has always been able to found such a rate of steel discharge that the level of steel in the tundish is within the technological requirements. As a result, it is possible to ensure the proposed algorithm triggering for each casting earlier than the operator stops the process manually. At the same time, the amount of steel with slag left in ladle does not exceed 3.8 tons comparing to the moment of the slag cut-off made by the operator.

Chitin in pogonophore tubes

1965 ◽  
Vol 45 (3) ◽  
pp. 659-661 ◽  
Author(s):  
J. Blackwell ◽  
K. D. Parker ◽  
K. M. Rudall
Keyword(s):  
Absorption Spectra ◽  
Systematic Position ◽  
X Ray Diffraction ◽  
X Ray ◽  
Protective Tube ◽  
Infra Red

The chitin from pogonophore tubes is shown to be essentially the same as that from the pen of the squid Loligo and is classified as β-chitin (as are the known chitins in annelids). However, certain important differences in detail are seen when comparing X-ray diffraction photographs and infra-red absorption spectra of the chitin from the two sources. These matters are of interest in defining the systematic position of the Pogonophora as well as in reaching an understanding of the functions of the protective tube.

scholarly journals Characterization of a cDNA encoding RP43, a CUB-domain-containing protein from the tube of Riftia pachyptila (Vestimentifera), and distribution of its transcript

2000 ◽  
Vol 350 (2) ◽  
pp. 421-427 ◽  
Author(s):  
Luc CHAMOY ◽  
Maryse NICOLAÏ ◽  
Brigitte QUENNEDEY ◽  
Françoise GAILL ◽  
Jean DELACHAMBRE
Keyword(s):  
Protein Interactions ◽  
Hydrothermal Vents ◽  
Unexpected Result ◽  
Protein Protein Interactions ◽  
Riftia Pachyptila ◽  
Binding Motifs ◽  
Morphogenetic Protein ◽  
Protective Tube ◽  
Cub Domain ◽  
Rapid Amplification

A major 43kDa protein from the protective tube of Riftiapachyptila (Vestimentifera), named RP43, was partly microsequenced after isolation by SDS/PAGE from the protein fraction of tubes collected around the hydrothermal vents at the East Pacific Rise. On the basis of the partial peptide sequences obtained, experiments using reverse-transcriptase-mediated PCR and rapid amplification of cDNA ends led to the complete cDNA sequence. Analysis of deduced amino acid sequence of RP43 showed the presence of CUB domains (100–110-residue-spanning domains first reported in the complement subcomponents C1r/C1s, epidermal-growth-factor-related sea urchin protein and bone morphogenetic protein 1) that seem to be involved in protein–protein and glycosaminoglycan–protein interactions. This peculiarity strongly suggests that RP43 might have a crucial role in tightening the different elements of the worm tube. However, the absence of chitin-binding motifs inclines us to favour a role in protein–protein interactions during assembly of the tube components. The RP43 mRNA was found to be present in specific epidermal cells from the worm body wall but never in the chitin-synthesizing gland cells. This unexpected result clearly indicates that the major tube protein is synthesized in specialized areas of the outer epithelium and that at least two different tissues are involved in the synthesis of the exoskeleton.

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