BIRD detection and analysis of high-temperature events: first results

2003 ◽  
Author(s):  
Boris Zhukov ◽  
Klaus Briess ◽  
Eckehard Lorenz ◽  
Dieter Oertel ◽  
Wolfgang Skrbek
Keyword(s):  
High Temperature ◽  
First Results ◽  
Bird Detection

A new diagnostic for multiple populations: NGC 6388 as a test case

2019 ◽  
Vol 14 (S351) ◽  
pp. 267-268
Author(s):  
Angela Bragaglia ◽  
Eugenio Carretta
Keyword(s):  
High Temperature ◽  
Sample Size ◽  
Globular Cluster ◽  
First Generation ◽  
Stellar Populations ◽  
Test Case ◽  
Temperature Range ◽  
Diagnostic Plot ◽  
First Results ◽  
Very High

AbstractRecently, the sample size of stars with detailed, homogeneous abundances in the massive bulge Globular cluster NGC 6388 expanded to 185 giants. We use this wealth of data to present first results on its multiple stellar populations. In particular, i) we introduce a new diagnostic plot to survey the occurrence of very high temperature for H-burning in the first-generation polluters, and ii) we pinpoint a restricted temperature range reached by polluters at work in NGC 6388.

HYDROTHERMAL MODELING OF SECONDARY RESERVOIR FORMATI ON IN SILICEOUS LIMESTONS (H2O–CO2 SYSTEM)

2020 ◽  
pp. 43-58
Author(s):  
M. Yu. Zubkov ◽  
Keyword(s):  
Carbon Dioxide ◽  
High Temperature ◽  
Amorphous Silica ◽  
Hydrothermal Fluid ◽  
West Siberia ◽  
Hydrothermal Conditions ◽  
Secondary Porosity ◽  
First Results ◽  
Siliceous Limestone ◽  
First Time

We have discussed the first results of hydrothermal modeling of the formation of secondary reservoirs (hydrothermal silicites) in siliceous limestones, which are widespread in the Pre-Jurassic complex of West Siberia, namely, in the H2O-CO2 system, in which the mole fraction of CO2 varied from 0.0 to 1.0, and the temperature from 215 to 410оС. It has been found that in this system there is a predominant dissolution of carbonates and, first of all, dolomite, as a result of which the surface of siliceous limestone is silicified and secondary porosity is formed in them. In some samples, quartz microcrystals with varying degrees of perfection of crystal faceting are shaped. It is found that pyrite is also unstable under these hydrothermal conditions and decomposes forming iron-containing carbonates at its sacrifice. Its transformation into pyrrhotite and copper and nickel sulfides is also observed. Biogenic quartz dissolved by a hydrothermal fluid is released from it either in the form of microcrystalline quartz, or in the form of quenching phases represented by cristobalite and/or amorphous silica. It is also found that at temperatures above 360°C, instead of iron-containing carbonates, chlorite is formed due to pyrite, while kaolinite also decomposes along with pyrite. It was experimentally established for the first time that at a high temperature (410°C), carbon dioxide acquires oxidizing properties and, as a result of its interaction with copper, oxide and red oxide of copper are formed. In addition, under these conditions, pyrite passes into iron-containing carbonates rather than chlorite. The main regularities of the formation of secondary reservoirs, i. e. hydrothermal silicites, in the Paleozoic siliceous limestone have been revealed.

scholarly journals The electric discharge in monatomic gases

1908 ◽  
Vol 80 (536) ◽  
pp. 92-109 ◽  
Keyword(s):  
High Temperature ◽  
Electric Discharge ◽  
Inert Gases ◽  
Inert Gas ◽  
Electric Conduction ◽  
Spark Gap ◽  
Short Summary ◽  
First Results ◽  
Pure Helium ◽  
Metallic Calcium

In a recent paper one of us has described the use of metallic calcium at high temperature for the production of high vacua, and in spectroscopic work as a very perfect chemical absorbent of all except the chemically inert gases. It was shown that helium and argon purified by calcium from traces of common gases or vapours, with which they are in practice invariably contaminated during manipulation, showed a great disinclination to conduct the discharge. In ordinary spectrum-tubes, helium offered a resistance equivalent to an alternative spark-gap of an inch in air, at a pressure of 0·05 mm., and argon at 0·02 mm. of mercury. This behaviour of the monatomic gases, together with the closely-allied phenomenon shown by spectrum-tubes filled with these gases of becoming non-conducting, or “running out,” under the action of the discharge, have now been investigated in detail. A great number of experiments have been performed and a short summary will be given in the present paper. The main object was to settle whether electric conduction in the monatomic gases is essentially different from that in other gases. The first results raised at least a presumption that perfectly pure helium might be unable to conduct the discharge at all, so that the running out of spectrum-tubes might be due to the absorption of the impurities only by the electrodes and not by the absorption of the inert gas itself. This view, however, proved to be untenable.

scholarly journals Processing, mechanical and thermophysical properties of silicon nitride based composites with carbon nanotubes and graphene

2007 ◽  
Vol 1 (1-2) ◽  
pp. 35-41 ◽  
Author(s):  
O. Koszor ◽  
F. Wéber ◽  
P. Arató ◽  
A. Lindemann ◽  
L.P. Biró ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Temperature ◽  
Silicon Nitride ◽  
Thermophysical Properties ◽  
Bending Strength ◽  
Single Wall Carbon Nanotubes ◽  
Manufacturing Processes ◽  
First Results ◽  
High Temperature Processing ◽  
Good Contact

Silicon nitride based composites with different amount (1, 2 and 3 wt%) of multi-wall and single-wall carbon nanotubes, and graphene have been prepared. Optimisation of the manufacturing processes has been conducted to preserve the carbon nanotubes in composites and to avoid damaging during high temperature processing. The first results show that carbon nanotubes have a good contact to the surface of silicon nitride grains. In the case of increase of sintering pressure an increase of bending strength was achieved. It was found that microstructure features achieved by properly designed sintering parameters are the main responsible factors for the strength improvements.

scholarly journals Heat resistant electronic modules for intelligent medical sterile containers

10.29007/7vcb ◽  
2018 ◽  
Author(s):  
Lukas Böhler ◽  
Mateusz Daniol ◽  
Lukas Kleinhans ◽  
Anton Keller ◽  
Ryszard Sroka
Keyword(s):  
High Temperature ◽  
Epoxy Resin ◽  
Additional Data ◽  
Electronic System ◽  
High Mass ◽  
Electronic Components ◽  
Heat Resistant ◽  
Communication Module ◽  
First Results ◽  
Entrapped Air

The digitalisation gets more and more important in our daily life. Also in medical technology instruments and devices need to become intelligent and be able to both collect and provide additional data. This research is about the development of an electronic sensor system for sterilisable medical containers. Hereby just a few concepts exist to equip the containers with sensor modules but the high temperature of 135 °C during the sterilisation is still a big challenge.The objective for this research is to find a heat resistant insulation for an electronic system with a power supply, sensors for both sterilisation and transport and a low power communication module. Furthermore, the thermal energy of the sterilisation shall be used for powering up the system.In a first step an epoxy resin was used to insulate the electronics and a high temperature battery. By using the temperature sensor of a Bluetooth module the module temperature could be measured during multiple steam sterilisations. Following, a partly insulated thermoelectric generator shall be used to get energy by the achieved temperature difference.First results show that the used epoxy resin limits the temperature to 81 °C. However, the resin was damaged after 21 sterilisation cycles due to its high mass and entrapped air. Therefore, the insulation needs to be minimized and the electronic components need to be able withstanding higher temperatures. Additionally, insulations with not yet considered materials will be tested. Also the possibility of insulating just heat-sensitive parts like the power elements will be investigated.

High-Temperature Self-Healing Metallic Coating: Concepts and First Results

2009 ◽  
Author(s):  
E. R. Kutelia ◽  
S. I. Bakhtiyarov ◽  
O. O. Tsurtsumia ◽  
A. S. Bakhtiyarov ◽  
B. P. Eristavi
Keyword(s):  
Wound Healing ◽  
High Temperature ◽  
Thermal Barrier Coating ◽  
Metallic Coating ◽  
The Self ◽  
Thermal Barrier ◽  
Self Healing ◽  
Barrier Coating ◽  
Metal Ceramic ◽  
First Results

This work presents the possibility to realize the self healing mechanisms for heterogeneous architectured metal/ceramic high temperature sandwich thermal barrier coating systems on the surfaces refractory metals by analogy of wound healing in the skin.

Development of Ultra-High Temperature Ceramics: From Monoliths to Composites

2018 ◽  
Vol 941 ◽  
pp. 2041-2046 ◽  
Author(s):  
Aurélie Julian-Jankowiak ◽  
V. Mathivet ◽  
Jean François Justin ◽  
Vincent Guérineau
Keyword(s):  
High Temperature ◽  
Ceramic Matrix Composites ◽  
Matrix Composites ◽  
Materials Development ◽  
Ultra High Temperature Ceramics ◽  
Plasma Sintering ◽  
First Results ◽  
Spark Plasma ◽  
Ultrahigh Temperature ◽  
Oxidation Behaviors

Regarding materials development, our studies have been mainly focused on ZrB2-SiC and HfB2-SiC compositions with TaSi2or Y2O3additions using hot pressing and spark plasma sintering. These additives have been used to decrease the sintering temperature and to improve the oxidation resistance. Interesting mechanical properties at room and high temperature have been measured. Moreover, excellent oxidation behaviors have been observed up to 2000-2200°C with Y2O3. Last developments are centered on the manufacturing of ultrahigh temperature ceramic matrix composites (UHTCMC) using slurry infiltration and pyrolysis for example. First results are encouraging.

Identification of Thermal Characteristics of Selected Refractory Composites under High Temperature

2016 ◽  
Vol 865 ◽  
pp. 261-265
Author(s):  
František Šot ◽  
Stanislav Šťastník ◽  
Jiří Vala
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Computational Simulation ◽  
Thermal Characteristics ◽  
Thermal Capacity ◽  
Good Choice ◽  
Technical Standards ◽  
First Results ◽  
Classical Thermodynamics ◽  
Refractory Composites

High-temperature behaviour of refractory composites needs proper experimental and theoretical analysis, coming from classical thermodynamics. The dependence of usual thermal characteristics, as the thermal conductivity and thermal capacity, on temperature, cannot be neglected in any computational simulation, thus the experimental identification of their effective values is required. Whereas valid technical standards related to the hot-wire measurement technique enables us only certain approximate evaluation of thermal diffusivity, the very similar experimental configuration, supplied by the more advanced physical, mathematical and computational analysis, offers a possibility of reliable simultaneous identification of more characteristics. The crucial application is to the selection of appropriate silicate materials for the design of high-temperature storage of solar energy where both high thermal conductivity and thermal capacity are required. The first results refer to certain magnesite-based products as the good choice.

VII. Note on the specific gravity of the vapours of the chlorides of thallium and lead

1878 ◽  
Vol 27 (185-189) ◽  
pp. 426-428 ◽  
Keyword(s):  
High Temperature ◽  
Specific Gravity ◽  
Molecular Weights ◽  
Boiling Points ◽  
First Results ◽  
Made In

Experimental difficulties of so serious a nature surround the attempt to ascertain the specific gravity of vapours at a high temperature that, in spite of the interest which attaches to this subject, but few additions have been made in our knowledge in this direction since the researches of Deville and Troost. The present experiments, of which this notice contains the first results, have been made with the object of so simplifying the process as to render it easy to determine the specific gravity of the vapours of bodies possessing high boiling-points with a degree of accuracy sufficient for the purpose of controlling their molecular weights.

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