The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
G Petzow - One of the best experts on this subject based on the ideXlab platform.
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thermal shock Testing of ceramics a new Testing Method
Journal of the American Ceramic Society, 1991Co-Authors: Gerold A Schneider, G PetzowAbstract:The thermal shock behavior of Si{sub 3}N{sub 4} has been determined with a new type of computer-controlled Testing equipment. Thin circular disks are heated up to 1350{degrees}C with two tungsten halogen lamps yielding heating rates up to 1000{degrees}C/s. The sample temperature is measured in situ with an infrared pyrometer and used to calculate the transient thermal stresses. The simple geometry of radially orientated notches allows in situ observation of the crack growth behavior during thermal shock. Measured failure times are used to determine the fracture toughness of the material under thermal shock loading, K{sub c} {sup TS}, from room temperature (RT) up to 1000{degrees}C. Comparison of the results with K{sub Ic} {sup SENB} values measured by the single-edge notch beam Method at RT shows excellent agreement.
Gerold A Schneider - One of the best experts on this subject based on the ideXlab platform.
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thermal shock Testing of ceramics a new Testing Method
Journal of the American Ceramic Society, 1991Co-Authors: Gerold A Schneider, G PetzowAbstract:The thermal shock behavior of Si{sub 3}N{sub 4} has been determined with a new type of computer-controlled Testing equipment. Thin circular disks are heated up to 1350{degrees}C with two tungsten halogen lamps yielding heating rates up to 1000{degrees}C/s. The sample temperature is measured in situ with an infrared pyrometer and used to calculate the transient thermal stresses. The simple geometry of radially orientated notches allows in situ observation of the crack growth behavior during thermal shock. Measured failure times are used to determine the fracture toughness of the material under thermal shock loading, K{sub c} {sup TS}, from room temperature (RT) up to 1000{degrees}C. Comparison of the results with K{sub Ic} {sup SENB} values measured by the single-edge notch beam Method at RT shows excellent agreement.
J M Andrews - One of the best experts on this subject based on the ideXlab platform.
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bsac standardized disc susceptibility Testing Method version 7
Journal of Antimicrobial Chemotherapy, 2004Co-Authors: J M AndrewsAbstract:This article highlights key amendments incorporated into version 11 of the BSAC standardized disc susceptibility Testing Method, available as Supplementary data at JAC Online (http://jac.oxfordjournals.org/) and on the BSAC web site (http://bsac.org.uk/susceptibility/guidelines-standardized-disc-susceptibility-Testing-Method/). The basic disc susceptibility Testing Method remains unchanged, but there have been a number of alterations to the interpretive criteria for certain organism/drug combinations due to continuing harmonization with the EUCAST MIC breakpoints and constant efforts to improve the reliability and clinical applicability of the guidance.
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bsac standardized disc susceptibility Testing Method version 8
Journal of Antimicrobial Chemotherapy, 2004Co-Authors: J M AndrewsAbstract:There have been considerable changes to the format of the recommendations since the previous version (version 7). The majority of the footnotes to the tables have been removed and the notations added to the end column; it is hoped that this change will avoid confusion in interpretation. Antibiotics have been separated into groups, e.g. beta-lactams, aminoglycosides, etc. Recommendations for urinary tract infections (UTIs) have been removed for most agents except for those that are administered solely for the treatment of uncomplicated UTIs or where there are limited recommendations for specific organisms, e.g. trimethoprim. For agents that previously had dual recommendations, systemic recommendations remain and the intermediate category can be used for interpretation for UTIs because intermediate susceptibility infers that the infection may respond as the agent is concentrated at the site of infection. This change will also avoid errors in interpretation when an organism is isolated from multiple sites, e.g. blood and urine. The changes that have been made to version 7 are as follows: MIC and zone diameter breakpoints (BPs) for trimethoprim, fosfomycin and nitrofurantoin for UTIs (Table 7); MIC and zone diameter breakpoints (BPs) for doripenem (Tables 7-9); colistin MIC BPs for Pseudomonas spp. (Table 9), co-trimoxazole MIC BPs for Stenotrophomonas maltophilia (Table 10); staphylococci MIC and zone diameter BPs for clarithromycin, clindamycin, erythromycin, quinupristin/dalfopristin, trimethoprim UTI, nitrofurantoin UTI and rifampicin (Table 11); Streptococcus pneumoniae MIC and zone diameter BPs for azithromycin, clarithromycin, erythromycin, co-trimoxazole, linezolid, rifampicin and telithromycin (Table 12); addition of streptomycin recommendations for enterococci (Table 13); enterococcal MIC and zone diameter BPs for quinupristin/dalfopristin, nitrofurantoin UTI and trimethoprim UTI (Table 13); beta-haemolytic streptococci MIC and zone diameter BPs for azithromycin, clarithromycin, erythromycin and telithromycin (Table 15); clarithromycin and erythromycin MIC and zone diameter BPs for Moraxella catarrhalis (Table 16); azithromycin MIC BPs for Neisseria gonorrhoeae (Table 17); chloramphenicol and rifampicin MIC BPs for Neisseria meningitidis (Table 18); azithromycin MIC BPs for Haemophilus influenzae (Table 19); MIC BPs for metronidazole for Bacteroides fragilis, Bacteroides thetaiotaomicron and Clostridium perfringens (Tables 23-25, respectively); susceptibility Testing of Listeria spp. (Appendix 3); the acceptable range for ATCC 25923 to a 10 microg tobramycin disc (Table 26).
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bsac standardized disc susceptibility Testing Method
Journal of Antimicrobial Chemotherapy, 2001Co-Authors: J M AndrewsAbstract:For nearly a decade microbiologists have used the MIC breakpoints published in the BSAC Guide to Susceptibility Testing to interpret susceptibility. Historically, and unlike the rest of Europe, the UK and Ireland have used a comparative Method of disc Testing to interpret susceptibility rather than one based on a correlation between MIC and zone of inhibition. Although innovative when introduced in the 1970s, Stokes' comparative Method has evolved ad hoc and it has become increasingly apparent that there is a need for a standardized Method of disc Testing that is correlated with BSAC MIC breakpoints. The Method described here, like all other standardized Methods of disc Testing, cannot be adapted by the user, and interpretative criteria are only applicable if the Method is adhered to fully. A major advantage of this approach to susceptibility Testing is that data from several sources can be combined for surveillance of resistance, a task that has been made much easier by the introduction of this Method and coincides with the availability of automated zone measuring devices. It is hoped that the Method described here will provide the core document for standard operating procedures; however, changes will necessarily occur over time as the Method is developed and refined.
Jianqiu Wang - One of the best experts on this subject based on the ideXlab platform.
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a novel vibration mode Testing Method for cylindrical resonators based on microphones
Sensors, 2015Co-Authors: Yongmeng Zhang, Jianqiu WangAbstract:Non-contact Testing is an important Method for the study of the vibrating characteristic of cylindrical resonators. For the vibratory cylinder gyroscope excited by piezo-electric electrodes, mode Testing of the cylindrical resonator is difficult. In this paper, a novel vibration Testing Method for cylindrical resonators is proposed. This Method uses a MEMS microphone, which has the characteristics of small size and accurate directivity, to measure the vibration of the cylindrical resonator. A Testing system was established, then the system was used to measure the vibration mode of the resonator. The experimental results show that the orientation resolution of the node of the vibration mode is better than 0.1°. This Method also has the advantages of low cost and easy operation. It can be used in vibration Testing and provide accurate results, which is important for the study of the vibration mode and thermal stability of vibratory cylindrical gyroscopes.
Naser A Alshayea - One of the best experts on this subject based on the ideXlab platform.
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effect of specimen geometry and Testing Method on mixed mode i ii fracture toughness of a limestone rock from saudi arabia
Rock Mechanics and Rock Engineering, 2000Co-Authors: K Khan, Naser A AlshayeaAbstract:The effect of Testing Method and specimen geometry such as diameter, thickness, and crack length and type on measured fracture toughness was investigated using specimens collected from a limestone rock formation outcropping in the Central Province of Saudi Arabia. Straight Edge Cracked Round Bar Bend (SECRBB), semicircular disk specimens under three point bending, and Brazilian disk specimens under diametrical compression were used in this investigation. SECRBB specimens were used for the Mode-I study, and notched Brazilian disk and semicircular specimens were used for the mixed Mode I–II study. The results show that specimen diameter and crack type have a substantial influence on the measured fracture toughness; however, loading rate, crack size, and specimen thickness seem to have a negligible effect on the fracture toughness. Mode-I fracture toughness is significantly influenced by specimen diameter and crack type, while their effects on Mode-II fracture toughness are generally negligible. The different specimens (SECRBB, Brazilian disk, and semicircular) can give comparable results only when the proper span to diameter ratio is used. The Brazilian disk with a straight notch was found to be the most convenient geometry to use for fracture toughness determination. A simple Method of making a precise notch inside the disk is presented, using the combination of a drilling machine and a wire saw.
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effect of specimen geometry and Testing Method on mixed mode i ii fracture toughness of a limestone rock from saudi arabia
Rock Mechanics and Rock Engineering, 2000Co-Authors: K Khan, Naser A AlshayeaAbstract:The effect of Testing Method and specimen geometry such as diameter, thickness, and crack length and type on measured fracture toughness was investigated using specimens collected from a limestone rock formation outcropping in the Central Province of Saudi Arabia. Straight Edge Cracked Round Bar Bend (SECRBB), semicircular disk specimens under three point bending, and Brazilian disk specimens under diametrical compression were used in this investigation. SECRBB specimens were used for the Mode-I study, and notched Brazilian disk and semicircular specimens were used for the mixed Mode I–II study. The results show that specimen diameter and crack type have a substantial influence on the measured fracture toughness; however, loading rate, crack size, and specimen thickness seem to have a negligible effect on the fracture toughness. Mode-I fracture toughness is significantly influenced by specimen diameter and crack type, while their effects on Mode-II fracture toughness are generally negligible. The different specimens (SECRBB, Brazilian disk, and semicircular) can give comparable results only when the proper span to diameter ratio is used. The Brazilian disk with a straight notch was found to be the most convenient geometry to use for fracture toughness determination. A simple Method of making a precise notch inside the disk is presented, using the combination of a drilling machine and a wire saw.
