scholarly journals Correlation Dependences between Short-Term/Long-Term Static Strength Characteristics and Creep Resistance of Tungsten at High Temperatures

2005 ◽  
Vol 37 (6) ◽  
pp. 584-592 ◽  
Author(s):  
V. A. Borisenko ◽  
V. V. Bukhanovskii ◽  
I. Mamuzic
Keyword(s):  
High Temperatures ◽  
Creep Resistance ◽  
Static Strength ◽  
Strength Characteristics ◽  
Short Term

INVESTIGATION OF THE STRENGTH CHARACTERISTICS DISPERSION-STRENGTHENED METAL-CERAMIC COMPOSITE MATERIAL VKM22

2021 ◽  
pp. 30-38
Author(s):  
D.I. Pevchev ◽  
◽  
M.A. Gorbovets ◽  
P.V. Ryzhkov ◽  
E.I. Kurbatkina ◽  
...  
Keyword(s):  
Metal Matrix ◽  
Ceramic Composite ◽  
Strength Characteristics ◽  
Matrix Composites ◽  
Term Strength ◽  
Reliable Operation ◽  
Short Term ◽  
Metal Ceramic ◽  
Increased Strength

In many industries, such as mechanical engineering and aerospace, traditional alloys are being replaced by metal matrix composites (MCM). Compared to unreinforced alloys, MCM is characterized by increased strength and rigidity combined with low density. To calculate the resource of nodes for the safe and reliable operation of new equipment, it is necessary to have a set of calculated values of the MCM strength characteristics, including the characteristics of short-term and long-term strength, low-cycle (LCF) and high-cycle (HCF) fatigue. The work is devoted to the study of the characteristics of short-term and long-term strength, LCF and MCF fatigue of dispersion-strengthened MKM grade VKM22.

High-Temperature Properties of SiC-Si3N4 Particle Composites

1999 ◽  
Vol 122 (1) ◽  
pp. 8-12 ◽  
Author(s):  
G. Woetting ◽  
B. Caspers ◽  
E. Gugel ◽  
R. Westerheide
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Hot Pressing ◽  
Oxidation Behavior ◽  
Short Term ◽  
High Temperature Properties ◽  
Sintering Additive ◽  
Hot Pressing Sintering

Due to promising results in literature, SiC-Si3N4 particle composites in the range 0–100 percent SiC were evaluated. Focusing on high-temperature properties, mainly Y2O3 was used as sintering additive. Consolidation occurred primarily by hot-pressing, sintering tests were performed for comparison. Besides short-term properties like strength, toughness etc., long-term properties like creep and oxidation behavior were determined. Results as a function of SiC-content and microstructure were discussed with respect to materials’ performance at high temperatures and possibilities of their production on a technical scale. [S0742-4795(00)00201-5]

scholarly journals High-Temperature Properties of SiC-Si3N4 Particle Composites

1998 ◽  
Author(s):  
Gerhard Woetting ◽  
Bernhard Caspers ◽  
Ernst Gugel ◽  
Ralf Westerheide
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Hot Pressing ◽  
Oxidation Behavior ◽  
Short Term ◽  
High Temperature Properties ◽  
Sintering Additive ◽  
Hot Pressing Sintering

Due to promising results in literature, SiC-Si3N4 particle composites in the range 0–100% SiC were evaluated. Focusing on high-temperature properties, mainly Y2O3 was used as sintering additive. Consolidation occurred primarily by hot-pressing, sintering tests were performed for comparison. Besides short-term properties like strength, toughness etc., long-term properties like creep and oxidation behavior were determined. Results as a function of SiC-content and microstructure were discussed with respect to materials’ performance at high temperatures and possibilities of their production on a technical scale.

Conceptual short-term memory (CSTM) supports core claims of Christiansen and Chater

2016 ◽  
Vol 39 ◽  
Author(s):  
Mary C. Potter
Keyword(s):  
Working Memory ◽  
Rapid Serial Visual Presentation ◽  
Language Comprehension ◽  
Short Term Memory ◽  
Visual Presentation ◽  
Long Term Memory ◽  
Short Term ◽  
Term Memory ◽  
Use Of Knowledge

AbstractRapid serial visual presentation (RSVP) of words or pictured scenes provides evidence for a large-capacity conceptual short-term memory (CSTM) that momentarily provides rich associated material from long-term memory, permitting rapid chunking (Potter 1993; 2009; 2012). In perception of scenes as well as language comprehension, we make use of knowledge that briefly exceeds the supposed limits of working memory.

Ultrastructural investigations of MDL 19,660-induced effects on the canine platelet and megakaryocyte

1990 ◽  
Vol 48 (3) ◽  
pp. 374-375
Author(s):  
D.E. Loudy ◽  
J. Sprinkle-Cavallo ◽  
J.T. Yarrington ◽  
F.Y. Thompson ◽  
J.P. Gibson
Keyword(s):  
Antidepressant Drug ◽  
Beagle Dogs ◽  
Long Term Effects ◽  
Short Term ◽  
Platelet Counts ◽  
Toxicological Studies ◽  
Induced Aggregation ◽  
Internal Architecture

Previous short term toxicological studies of one to two weeks duration have demonstrated that MDL 19,660 (5-(4-chlorophenyl)-2,4-dihydro-2,4-dimethyl-3Hl, 2,4-triazole-3-thione), an antidepressant drug, causes a dose-related thrombocytopenia in dogs. Platelet counts started to decline after two days of dosing with 30 mg/kg/day and continued to decrease to their lowest levels by 5-7 days. The loss in platelets was primarily of the small discoid subpopulation. In vitro studies have also indicated that MDL 19,660: does not spontaneously aggregate canine platelets and has moderate antiaggregating properties by inhibiting ADP-induced aggregation. The objectives of the present investigation of MDL 19,660 were to evaluate ultrastructurally long term effects on platelet internal architecture and changes in subpopulations of platelets and megakaryocytes.Nine male and nine female beagle dogs were divided equally into three groups and were administered orally 0, 15, or 30 mg/kg/day of MDL 19,660 for three months. Compared to a control platelet range of 353,000- 452,000/μl, a doserelated thrombocytopenia reached a maximum severity of an average of 135,000/μl for the 15 mg/kg/day dogs after two weeks and 81,000/μl for the 30 mg/kg/day dogs after one week.

Comparison of Auditory, Language, Memory, and Attention Abilities in Children With and Without Listening Difficulties

2020 ◽  
Vol 29 (4) ◽  
pp. 710-727
Author(s):  
Beula M. Magimairaj ◽  
Naveen K. Nagaraj ◽  
Alexander V. Sergeev ◽  
Natalie J. Benafield
Keyword(s):  
Auditory Processing ◽  
Short Term Memory ◽  
Group Differences ◽  
Long Term Memory ◽  
Short Term ◽  
Significant Group ◽  
Term Memory ◽  
Memory And Attention ◽  
Speed And Accuracy

Objectives School-age children with and without parent-reported listening difficulties (LiD) were compared on auditory processing, language, memory, and attention abilities. The objective was to extend what is known so far in the literature about children with LiD by using multiple measures and selective novel measures across the above areas. Design Twenty-six children who were reported by their parents as having LiD and 26 age-matched typically developing children completed clinical tests of auditory processing and multiple measures of language, attention, and memory. All children had normal-range pure-tone hearing thresholds bilaterally. Group differences were examined. Results In addition to significantly poorer speech-perception-in-noise scores, children with LiD had reduced speed and accuracy of word retrieval from long-term memory, poorer short-term memory, sentence recall, and inferencing ability. Statistically significant group differences were of moderate effect size; however, standard test scores of children with LiD were not clinically poor. No statistically significant group differences were observed in attention, working memory capacity, vocabulary, and nonverbal IQ. Conclusions Mild signal-to-noise ratio loss, as reflected by the group mean of children with LiD, supported the children's functional listening problems. In addition, children's relative weakness in select areas of language performance, short-term memory, and long-term memory lexical retrieval speed and accuracy added to previous research on evidence-based areas that need to be evaluated in children with LiD who almost always have heterogenous profiles. Importantly, the functional difficulties faced by children with LiD in relation to their test results indicated, to some extent, that commonly used assessments may not be adequately capturing the children's listening challenges. Supplemental Material https://doi.org/10.23641/asha.12808607

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