Quality Control and Service Performance

1964 ◽  
Vol 86 (4) ◽  
pp. 451-464
Author(s):  
H. Thielsch
Keyword(s):  
Heat Treatment ◽  
Quality Control ◽  
Service Performance ◽  
Current Standard ◽  
Considerable Confusion ◽  
Final Inspection ◽  
Writing Practice ◽  
Materials Specifications

Quality control requirements are discussed as they pertain to (a) materials specifications; (b) fabrication specifications including welding, heat-treatment, and cleaning; and (c) final inspection specifications. Current standard and specification writing practice is resulting in considerable confusion among the users of these specifications. Realistic levels of quality control commensurate with service requirements need to be established. Lack of recognition of service requirements has resulted in excessively tight quality control requirements. Excessive repairs have led to more serious defect conditions not detectable by the normal inspection requirements involved.

Heat-sensitive Inhibitor(s) Produced in Poor Quality Raw Milk1

1976 ◽  
Vol 39 (11) ◽  
pp. 774-775 ◽  
Author(s):  
A. H. DUTHIE ◽  
C. G. WOELFEL ◽  
K. M. NILSON ◽  
H. V. ATHERTON
Keyword(s):  
Heat Treatment ◽  
Quality Control ◽  
Control Program ◽  
Raw Milk ◽  
Poor Quality ◽  
Positive Test Result ◽  
Plate Method ◽  
Quality Control Program ◽  
Test Result ◽  
Disc Assay

As bacterial numbers in raw milk increased to millions and pH decreased to 6.3 and lower, inhibitory substances were produced that gave positive tests by the Bacillus subtilis disc assay and Sarcina lutea cylinder plate method. These substances were inactivated by heat treatment. The inhibitor was not lactic acid. Results of our study emphasized that all laboratories that test raw milks for antibiotics must be certain to heat samples before reporting a positive test result for inhibitor. If a heat-sensitive inhibitor is found in raw milk, one should evaluate the quality control program.

scholarly journals Implementation of a quality control for Radio Occultation observations in the presence of large gradients of atmospheric refractivity

2014 ◽  
Vol 7 (10) ◽  
pp. 10487-10511
Author(s):  
L. Cucurull
Keyword(s):  
Quality Control ◽  
Radio Occultation ◽  
Model Simulation ◽  
Retrieval Process ◽  
Current Standard ◽  
Quality Controls ◽  
Standard Quality ◽  
Control Procedures ◽  
Tropical Troposphere ◽  
Environmental Prediction

Abstract. In preparation for the launch of the first six satellites of the COSMIC-2 mission in equatorial orbit, and the larger number of observations that such a mission will provide in the lower tropical troposphere, work is underway at the National Oceanic and Atmospheric Administration (NOAA) to improve the assimilation of Radio Occultation (RO) observations, particularly in the lower tropical troposphere. As part of the improvement of the bending angle forward operator at the National Centers for Environmental Prediction (NCEP), additional quality controls aimed to detect and reject observations that might have been affected by super-refraction conditions have been implemented and tested. The updated quality control procedures also address the situation where the model detects atmospheric super-refraction conditions. This paper describes the limitations of the current standard quality controls and discusses the implementation of additional quality control procedures to address the limitations of assimilating observations likely affected by the super-refraction conditions, either in the model simulation or in the retrieval process.

scholarly journals Implementation of a quality control for radio occultation observations in the presence of large gradients of atmospheric refractivity

2015 ◽  
Vol 8 (3) ◽  
pp. 1275-1285 ◽  
Author(s):  
L. Cucurull
Keyword(s):  
Quality Control ◽  
Radio Occultation ◽  
Model Simulation ◽  
Retrieval Process ◽  
Current Standard ◽  
Quality Controls ◽  
Standard Quality ◽  
Control Procedures ◽  
Tropical Troposphere ◽  
Environmental Prediction

Abstract. In preparation for the launch of the first six satellites of the COSMIC-2 mission in equatorial orbit, and the larger number of observations that such a mission will provide in the lower tropical troposphere, work is underway at the National Oceanic and Atmospheric Administration (NOAA) to improve the assimilation of radio occultation (RO) observations, particularly in the lower tropical troposphere. As part of the improvement of the bending angle forward operator at the National Centers for Environmental Prediction (NCEP), additional quality controls aimed to detect and reject observations that might have been affected by super-refraction conditions have been implemented and tested. The updated quality control procedures also address the situation where the model detects atmospheric super-refraction conditions. This paper describes the limitations of the current standard quality controls and discusses the implementation of additional quality control procedures to address the limitations of assimilating observations likely affected by the super-refraction conditions, either in the model simulation or in the retrieval process.

scholarly journals Postharvest Quality of Early Season Grapefruit after Forced-air Vapor Heat Treatment

HortScience ◽  
1992 ◽  
Vol 27 (5) ◽  
pp. 422-424 ◽  
Author(s):  
W.R. Miller ◽  
R.E. McDonald
Keyword(s):  
Heat Treatment ◽  
Titratable Acidity ◽  
Soluble Solids ◽  
Postharvest Quality ◽  
Citrus Paradisi ◽  
Peel Color ◽  
Forced Air ◽  
Subsequent Storage ◽  
Final Inspection

`Marsh' and `Ruby Red' grapefruit (Citrus paradisi Macf.) were harvested in Florida during Oct. and Nov. 1990, degreened in an ethylene chamber, exposed to vapor heat (VH) treatment (43.5 ± 0.1C for ≈240 min), and evaluated for deterioration in quality and development of injury after various storage regimes. Symptoms of aging averaged 6% and 8% of the surface on `Ruby Red' and `Marsh' fruit, respectively, and the VH treatment had reduced the incidence of aging by 45% after 5 weeks of storage (4 weeks at 16C plus 1 week at 21C). Total decay, mostly stem-end rots (Diplodia spp. and Phomopsis spp.), remained relatively low (≈5%) in both treated and nontreated fruit after 5 weeks of storage. The VH treatment had little effect on change in peel color during treatment or subsequent storage. After the final inspection, `Marsh' fruit was higher in total soluble solids and titratable acidity than `Ruby Red' fruit, but these quality indicators and pH were not affected by the VH treatment. VH treatment did not adversely affect the quality of `Marsh' or `Ruby Red' grapefruit harvested early in the season; hence, VH should be considered as a viable quarantine treatment for Florida grapefruit.

Some Aspects of Modern Aircraft Materials

1955 ◽  
Vol 59 (535) ◽  
pp. 494-501 ◽  
Author(s):  
H. Sutton
Keyword(s):  
Alloying Elements ◽  
List Type ◽  
Type Number ◽  
Current Standard ◽  
British Standard ◽  
Points Of View ◽  
Testing Schedule ◽  
Wartime Experience ◽  
Materials Specifications

Wartime experience with aircraft steels emphasised the desirability of a complete revision of specifications for aircraft steels from both the technical and inspectional points of view. This was undertaken in association with the steel makers and the Society of British Aircraft Constructors under the aegis of the British Standards Institution. The aims were(i)To reduce the number of basic types of steels to a minimum, consistent with satisfying the demands of aircraft engineers.(ii)To transfer as many materials from the D.T.D. series of specifications to the B.S. Aircraft series.(iii)To prepare an Inspection and Testing Schedule, which would exist separately from the Materials Specifications, but applicable to all steels in whatever form they may be required.(iv)To achieve a degree of economy in alloying elements, again without detriment to the satisfying of designer's requirements.The Inspection and testing schedule was issued as British Standard S100 in January 1949, but significant difficulties in its full application appeared in practice and it was not until the second half of 1952 that agreement was reached to put into practice the current standard 2 S100.

scholarly journals Quality Analysis of Long dan Xie gan Pill by a Combination of Fingerprint and Multicomponent Quantification with Chemometrics Analysis

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Jing Liu ◽  
Hui Liu ◽  
Zhong Dai ◽  
Shuangcheng Ma
Keyword(s):  
Quality Control ◽  
Quality Analysis ◽  
Current Standard ◽  
Hplc Fingerprint ◽  
Practical Strategy ◽  
Convenient Approach ◽  
Dual Channels ◽  
Quality Of Products ◽  
Main Components

Long dan Xie gan pill is a traditional complex compound preparation with a long history for treatment of diseases, including hepatocolic hygropyrexia, dizziness, tinnitus, and deafness. Quality of products from different manufacturers may be varied. Since the current standard could not control the quality of products in a comprehensive and effective way, this study aimed at establishing a practical and convenient approach for holistic quality control of the preparation. This study included both qualitative and quantitative works to get information on the overall composition and main components, respectively. As a result, HPLC fingerprint (UV 240 nm) similarities of all fifty samples were in the range of 0.65∼0.99. Results indicated that there was a difference among products from different manufacturers. Additionally, ten characteristic peaks of the fingerprint were tentatively identified by LC-MS. Further chemometrics analysis was utilized to evaluate the products from different manufacturers. At the same time, the HPLC (UV 285 nm) multicomponent quantification result showed that contents of gentiopicrin, baicalin, baicalein, and wogonin were in the range of 0.61–5.40, 1.96–5.33, 0.10–3.40, and 0.046–1.16 mg·g−1, respectively. Data analysis verified the main different component of baicalein from the fingerprint statistical analysis. It is worth mentioning that the qualitative fingerprint and quantitative multicomponent determination were simultaneously accomplished by HPLC-DAD with dual channels. The study provided sound basis for improving quality control standards. This study also provided practical strategy for overall quality control of traditional Chinese medicines.

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