An Experimental Evaluation of Drill Pipe Protectors

1977 ◽  
Vol 99 (1) ◽  
pp. 199-207
Author(s):  
W. B. Bradley
Keyword(s):  
Quality Control ◽  
Experimental Evaluation ◽  
Drill Pipe ◽  
Test Results ◽  
Contact Loads ◽  
Casing Wear ◽  
Low Rate

Previous tests [1] have shown drill pipe protectors are of value in reducing casing wear, particularly at high contact loads. However, the brand of protectors tested could not withstand high contact loads without slipping on the drill pipe and tearing apart. As a result, further tests were conducted to find a protector which can withstand high contact loads without slipping or failing and still minimize casing wear. Results from the present tests show that drill pipe protectors can be made to operate at high contact loads without failure, grip the drill pipe without slipping, and maintain a low rate of casing wear. In addition, the test results indicate that drill pipe protector quality control needs to be improved.

The Experimental Measurement of Casing Wear Due to Tripping—Part 1: Drill Pipe Wear

1975 ◽  
Vol 97 (2) ◽  
pp. 445-455
Author(s):  
J. E. Fontenot ◽  
J. W. McEver
Keyword(s):  
Experimental Investigation ◽  
Experimental Measurement ◽  
Field Data ◽  
Drill Pipe ◽  
Major Conclusion ◽  
Full Size ◽  
Contact Loads ◽  
Casing Wear ◽  
Water Base ◽  
Wear Tests

An experimental investigation was undertaken to explore the effects of various factors on casing wear due to tripping drill pipe. Wear tests were run using full-size samples of casing and drill pipe at various contact loads in water, a gel mud containing sand, and in a 14-lb/gal water base mud containing various quantities of simulated drill solids. The wear results were compared with field data. The major conclusion is that tripping drill pipe is generally not a major cause of casing wear.

Friction-Instability: A New Design Parameter for Brakes

1971 ◽  
Vol 93 (4) ◽  
pp. 1225-1228 ◽  
Author(s):  
W. L. Starkey ◽  
T. G. Foster ◽  
S. M. Marco
Keyword(s):  
Quality Control ◽  
Coefficient Of Friction ◽  
Design Parameter ◽  
Control Device ◽  
Experimental Facility ◽  
Test Results ◽  
Effective Manner ◽  
The Coefficient Of Friction ◽  
Brake Lining ◽  
The Right

A new design parameter, friction-instability, is defined in this paper. Friction-instability is a variation in the coefficient of friction which may occur at any time during the life of a brake lining. A friction-index is defined which measures this variation. A lining which has a high friction index may tend to cause an automobile to swerve either to the right or to the left. A unique experimental facility is described by means of which the friction-instability characteristics of brake linings can be measured. Test results using this facility are presented and interpreted. The friction-index is proposed as a new parameter which should be taken into consideration when brakes are designed and, developed. This index should be particularly useful as a quality control device to insure that machines which use mass-produced braking systems will perform in a safe and effective manner.

scholarly journals HUBUNGAN TINGKAT PENGETAHUAN IBU DAN DUKUNGAN SUAMI TERHADAP KEBERHASILAN PEMBERIAN ASI EKSKLUSIF

2019 ◽  
Vol 2 (1) ◽  
pp. 5
Author(s):  
Eka Putri Primasari
Keyword(s):  
Breast Milk ◽  
Exclusive Breastfeeding ◽  
Statistical Test ◽  
P Value ◽  
Test Results ◽  
Cross Sectional ◽  
Level Of Knowledge ◽  
Cross Sectional Design ◽  
The Relationship ◽  
Low Rate

Abstract: Breast milk is the best food for babies, especially in the first month of life. Breast milk contains all nutrients to build and provide the energy needed by the baby. The low rate of breastfeeding is a threat to child development. Several factors related to the success of exclusive breastfeeding are the level of knowledge of the mother and husband's support. The purpose of this study was to determine the relationship between the level of knowledge of mothers and husband's support  towards the success of exclusive breastfeeding in Lubuk Kilangan Puskesmas in 2017. This study was analytical with a cross sectional design. The population in this study amounted to 153 respondents. A sample of 31 respondents obtained by simple ramdom sampling. Data were analyzed bivariate. The statistical test results obtained p-value = 0,000. It can be concluded that there is a relationship between the knowledge of mothers about exclusive breastfeeding and husband's support for the success of exclusive breastfeeding.

Use of Statistical Modelling Techniques for Simulation

1993 ◽  
Author(s):  
Ebrahim Mazharsolook ◽  
David C. Robinson ◽  
Jonathan D. Casey
Keyword(s):  
Quality Control ◽  
Statistical Modelling ◽  
Test Results ◽  
Final Test ◽  
Product Model ◽  
Design Changes ◽  
Discrete Manufacturing ◽  
Similar Product ◽  
Modelling Techniques

Abstract Statistical methods are explored for the use in modelling of discrete manufacturing. The developed methodologies based on Design of Experiments (DOE) and stepwise regression to obtain the product model are described. This model is then embedded within a software system which is used for simulation of design changes, process changes and disturbances. The software is used to predict final test results in respect of up-stream parameter changes. A case study is presented o show the implementation of this method of modelling in Quality Control of manufacture. This case study has successfully been implemented. The system is currently assisting the company in design of similar product. Feasibility of applying Artificial Intelligen (AI) techniques to Model-Based Quality Control (MBQC) is investigated. An outline of the future development of Hybrid MBQC is then presented.

The Association between Diagnosis of Plantar Fasciitis and Windlass Test Results

2003 ◽  
Vol 24 (3) ◽  
pp. 251-255 ◽  
Author(s):  
Denise De Garceau ◽  
Danielle Dean ◽  
Susan Mais Requejo ◽  
David B. Thordarson
Keyword(s):  
Plantar Fasciitis ◽  
The Other ◽  
High Rate ◽  
Control Group ◽  
Test Results ◽  
Foot Pain ◽  
Positive Test Result ◽  
Pain Group ◽  
Test Result ◽  
Low Rate

Twenty-two patients with plantar fasciitis, 23 patients with other types of foot pain, and 30 patients in a control group were evaluated with the Windlass test performed in a weightbearing and non-weightbearing position. In the non-weightbearing test, the first MP joint was maximally dorsiflexed with the ankle stabilized. The weightbearing test was performed with the toes hanging off the edge of a stool and dorsiflexion of the first MP was performed. Seven of the 22 patients in the plantar fasciitis group had a positive weightbearing Windlass test (31.8%), while only three had a positive test result in a non-weightbearing position (13.6%). None of the patients in the other foot pain group or control group had pain in the weightbearing and non-weightbearing positions. Despite its high rate of specificity, the low rate of sensitivity of the Windlass test may limit its usefulness in the clinical evaluation in patients with plantar fasciitis.

Minimizing Casing Wear in Dog Legs

1977 ◽  
Vol 99 (1) ◽  
pp. 215-223 ◽  
Author(s):  
W. B. Bradley
Keyword(s):  
Drill Pipe ◽  
Field Measurements ◽  
Experimental Information ◽  
Wear Performance ◽  
Wear Rates ◽  
Casing Wear

Procedures are presented for estimating the amount of casing wear produced in wells by the rotation of tool joints, drill pipe, and drill pipe protectors against casing. The procedures are based upon experimental information and limited field measurements developed over a period of several years [1–5]. The procedures have been used with moderate success in predicting the casing wear rates seen in the field for a limited number of cases. The paper again emphasizes that with the proper use of drill pipe protectors casing wear can be minimized. In addition, the paper presents suggested procedures for selecting drill pipe protectors to assure consistent casing wear performance.

scholarly journals Prevalence of resistance to three fluoroquinolones: assessment of levofloxacin disk test error rates and surrogate predictors of levofloxacin susceptibility. AST Surveillance Group.

1996 ◽  
Vol 40 (7) ◽  
pp. 1633-1639 ◽  
Author(s):  
P C Fuchs ◽  
A L Barry ◽  
S D Brown
Keyword(s):  
Quality Control ◽  
Error Rates ◽  
Control Parameters ◽  
Test Results ◽  
Bacterial Isolates ◽  
Medical Centers ◽  
Direct Testing ◽  
Quality Control Parameters ◽  
Standard Quality ◽  
Disk Test

More than 3,000 consecutive clinical bacterial isolates from 10 U.S. medical centers were subjected to standard broth microdilution and disk diffusion tests to determine their susceptibilities to levofloxacin, ofloxacin, D-ofloxacin, and ciprofloxacin. Levofloxacin was confirmed to be twice as active as ofloxacin and to have activity comparable to that of ciprofloxacin, with minor variations in activity against some species. The prevalence of resistant isolates was 7.1% to levofloxacin, 9.3% to ciprofloxacin, and 11.2% to ofloxacin. The susceptibilities of some species to the quinolones were less than those reported in previous studies. Pseudomonas aeruginosa isolates had the greatest variability in their susceptibilities to the three drugs between the participating centers. Two proposed zone size breakpoints for levofloxacin disk tests yielded similar low error rates. Ofloxacin and ciprofloxacin susceptibility test results correlated reasonably well with those of levofloxacin and could be used as surrogate indicators of levofloxacin susceptibility, but that resulted in some serious errors, and thus, direct testing of levofloxacin susceptibility is preferable. Replicate testing of standard quality control strains confirmed the established and proposed quality control parameters for all three quinolones tested.

Assessment of the Concrete Compressive Strength in Existing Structures Based on Core Test Results

2018 ◽  
Vol 272 ◽  
pp. 238-243 ◽  
Author(s):  
Viktar V. Tur ◽  
Stanislav S. Derechennik
Keyword(s):  
Monte Carlo Simulation ◽  
Quality Control ◽  
Compressive Strength ◽  
Structural Reliability ◽  
Reliability Estimation ◽  
Control Procedure ◽  
Test Results ◽  
Concrete Compressive Strength ◽  
Existing Structures

Evaluation of the concrete compressive strength in existing structures is an important problem, which is associated with structural reliability estimation as well as a quality control procedure. In accordance with a new concept of EN 13791, reported by T.A.Harrison, one of the main targets of the standard is to determine not a class, but in-situ characteristic concrete compressive strength. Hereby proposed criterion for the estimation of the in-situ characteristic concrete compressive strength is based on the non-parametric confidence interval for quantile. This criterion was verified by the both Monte Carlo simulation and test results under the real concrete structures.

BACTERIOLOGICAL TESTING OF RAW MILK AND DAIRY PRODUCTS1,2

1971 ◽  
Vol 34 (12) ◽  
pp. 613-619 ◽  
Author(s):  
George W. Reinbold
Keyword(s):  
Public Health ◽  
Quality Control ◽  
Dairy Products ◽  
Raw Milk ◽  
Test Results ◽  
Farm Production ◽  
Bacteriological Test ◽  
Bacteriological Testing ◽  
Highly Correlated ◽  
Production Conditions

Bacteriological testing of raw milk and processed dairy products is not adequate for public health and quality control purposes. Bacteriological test results are not highly correlated with farm production conditions. Routine bacterial quality control tests are not always adequate for recovery of microorganisms injured during processing, Present systems and trends are discussed.

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