Chapter 7 Factors affecting the test parameters

1997 ◽  
Vol 96 ◽  
pp. 45-67
Keyword(s):  
Factors Affecting ◽  
Test Parameters

scholarly journals Integrated Design and Evaluation of a Soil-Covering and Film-Mulching Device for Sugarcane Transverse Planters

Agronomy ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1382
Author(s):  
Ke Li ◽  
Shizeng Li ◽  
Xiao Teng ◽  
Zhanglin Deng ◽  
Wenbo Huang ◽  
...  
Keyword(s):  
Optimal Parameter ◽  
Integrated Design ◽  
Field Tests ◽  
Factors Affecting ◽  
Disk Diameter ◽  
Average Value ◽  
Test Parameters ◽  
Breakage Rate ◽  
Film Mulching ◽  
Dip Angle

To solve the problem that the covering device of sugarcane cannot be adequate for the agronomic standards of seed cane setts planting, a soil-covering and film-mulching device for sugarcane transverse planting was designed. The device includes a soil-covering part, soil-compacting part, and film-mulching part. Through theoretical analysis of key components, the factors affecting the cane seed covering quality for the device were obtained. A quadratic orthogonal rotation regression test was conducted by a homemade prototype to explore the effects of disk diameter, central distance, disk depth in soil, and dip angle on soil covering thickness. The results showed that the above factors all have an extremely significant effect on the soil covering thickness, and the effect degree of each factor from high to low is central distance, disk depth in soil, dip angle, and disk diameter within the range of test parameters. The optimal parameter combination, with the disk diameter, the dip angle, the central distance, the disk depth in soil, and the diameter of the soil-compacting wheel being 304.7 mm, 55.1°, 386.5 mm, 32.4 mm, and 300 mm, respectively, was obtained by Design-Expert software and verified by comprehensive field tests. The results showed that the covering thickness is in the range of 94–111 mm, the average value is 102.6 mm, and the breakage rate is no more than 2.6%. The emergence rate is 86.4%, which is an improvement of 9.3% over that of a traditional covering device. The results suggested that the device can conform to the agricultural covering standard of sugarcane planting and provide a design basis for the application and popularization of the soil-covering and film-mulching device.

Characteristics and Methods Research on Heavy Compaction and Vibration Compaction of Graded Crushed Aggregate

2013 ◽  
Vol 857 ◽  
pp. 90-96
Author(s):  
Hong Hai Liu ◽  
Zhi Geng Zhang ◽  
Nieyangzi Liu ◽  
Deng Cheng Ma
Keyword(s):  
Shear Strength ◽  
Test Methods ◽  
Resonance Phenomenon ◽  
Factors Affecting ◽  
Friction Resistance ◽  
Test Parameters ◽  
Resistance To Deformation ◽  
Vibration Compaction ◽  
Crushed Aggregate ◽  
Compaction Properties

Graded crushed aggregate mixture form internal friction resistance rely on the interlocking and friction effects between the particles ,with high shear strength and resistance to deformation, which is difficult to compacted. Through the analysis of factors affecting the compaction properties of materials,self-vibration phenomenon and resonance phenomenon,theoretical study on the effect of shear strength of the material vibration, the comparative experiments were conducted by heavy compaction instrument and vibration compaction instrument,accommodate compaction property of graded crushed aggregate,the test methods were obtained,also the test parameters were determined, and verified by experiment.

scholarly journals PARAMETER OPTIMIZATION AND EXPERIMENT OF ORCHARD DOUBLE ROW DITCHING-FERTILIZING MACHINE

2020 ◽  
pp. 9-18
Author(s):  
HongJian Zhang ◽  
ChunBao Xu ◽  
ShuangXi Liu ◽  
Hao Jiang ◽  
Xuemei Liu ◽  
...  
Keyword(s):  
Conveyer Belt ◽  
Test Results ◽  
Double Row ◽  
Factors Affecting ◽  
Design And Optimization ◽  
Belt Speed ◽  
Guide Plate ◽  
Contour Lines ◽  
Test Parameters ◽  
Mechanism Parameter

In order to improve the fertilization uniformity and stability of the orchard double row ditching-fertilizing machine, the design was optimized. Firstly, the factors affecting the movement of the fertilizer particles were analysed in combination with the kinetic model of the fertilizer particles during the falling process. Secondly, the influence of each factor on the fertilization uniformity was analysed by single factor variance. Finally, the Box-Behnken central composite method was used to establish a mathematical model of fertilization uniformity of the orchard double row ditching-fertilizing machine, and regression statistical variance, response surface, and contour lines were used to analyse the influence of each mechanism parameter on the fertilization uniformity. The test results show that: when the test parameters of the conveyer belt speed is within 165~235 r·min-1, the advancing velocity is within 0.8~1.2 m·s-1, and the guide plate angle is changed within the range of 15~45°, the degree of influence of each factor on the fertilization uniformity from high to low is the conveyer belt speed, advancing velocity, the angle of the guide plate, and the conveyer belt speed; when the conveyer belt speed is 214 r·min-1, advancing velocity is 1 m·s-1, and the angle of the guide plate is 37°, the fertilizer coverage reaches 100%, and the fertilization uniformity is increased from 86.31% to 90.73%, and the fertilization stability is improved. The research results provide a theoretical basis for the design and optimization of orchard ditching-fertilizing machine.

Progress In The Practical Application Of Automated Image Analysis To Tem Negatives

1977 ◽  
Vol 35 ◽  
pp. 214-217
Author(s):  
F. A. Heckman ◽  
E. Redman ◽  
J.E. Connolly
Keyword(s):  
Image Analysis ◽  
Image Quality ◽  
Exposure Time ◽  
Image Contrast ◽  
Automated Image Analysis ◽  
Practical Application ◽  
Factors Affecting ◽  
High Image Quality ◽  
Qualitative Evidence ◽  
Comprehensive Study

In our initial publication on this subject1) we reported results demonstrating that contrast is the most important factor in producing the high image quality required for reliable image analysis. We also listed the factors which enhance contrast in order of the experimentally determined magnitude of their effect. The two most powerful factors affecting image contrast attainable with sheet film are beam intensity and KV. At that time we had only qualitative evidence for the ranking of enhancing factors. Later we carried out the densitometric measurements which led to the results outlined below.Meaningful evaluations of the cause-effect relationships among the considerable number of variables in preparing EM negatives depend on doing things in a systematic way, varying only one parameter at a time. Unless otherwise noted, we adhered to the following procedure evolved during our comprehensive study:Philips EM-300; 30μ objective aperature; magnification 7000- 12000X, exposure time 1 second, anti-contamination device operating.

Factors affecting microstructural scale in liquid crystalline polymers

1990 ◽  
Vol 48 (4) ◽  
pp. 220-221
Author(s):  
Christine M. Dannels ◽  
Christopher Viney
Keyword(s):  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Factors Affecting ◽  
Crystalline Polymers ◽  
Thermal Expansion Coefficients ◽  
Low Thermal Expansion ◽  
Lower Viscosity ◽  
Fine Microstructure ◽  
Planar Orientation ◽  
Strength And Stiffness

Processing polymers from the liquid crystalline state offers several advantages compared to processing from conventional fluids. These include: better axial strength and stiffness in fibers, better planar orientation in films, lower viscosity during processing, low solidification shrinkage of injection moldings (thermotropic processing), and low thermal expansion coefficients. However, the compressive strength of the solid is disappointing. Previous efforts to improve this property have focussed on synthesizing stiffer molecules. The effect of microstructural scale has been overlooked, even though its relevance to the mechanical and physical properties of more traditional materials is well established. By analogy with the behavior of metals and ceramics, one would expect a fine microstructure (i..e. a high density of orientational defects) to be desirable.Also, because much microstructural detail in liquid crystalline polymers occurs on a scale close to the wavelength of light, light is scattered on passing through these materials.

Factors affecting dentist participation in a state Medicaid program

1990 ◽  
Vol 54 (11) ◽  
pp. 638-643 ◽  
Author(s):  
PC Damiano ◽  
ER Brown ◽  
JD Johnson ◽  
JP Scheetz
Keyword(s):  
Medicaid Program ◽  
Factors Affecting

Speech Therapy Services in a Large School System: A Six-Year Overview

1976 ◽  
Vol 7 (4) ◽  
pp. 207-219 ◽  
Author(s):  
Constance P. DesRoches
Keyword(s):  
School System ◽  
Speech Therapy ◽  
Factors Affecting ◽  
Case Load ◽  
Number Of Children ◽  
School Population ◽  
System A ◽  
Therapy Services ◽  
And Shifts ◽  
Selection Factors

A statistical review provides analysis of four years of speech therapy services of a suburban school system which can be used for comparison with other school system programs. Included are data on the percentages of the school population enrolled in therapy, the categories of disabilities and the number of children in each category, the sex and grade-level distribution of those in therapy, and shifts in case-load selection. Factors affecting changes in case-load profiles are identified and discussed.

Assessing the Link Between Perception and Production in Cantonese Tone Acquisition

2019 ◽  
Vol 62 (5) ◽  
pp. 1243-1257 ◽  
Author(s):  
Peggy Pik Ki Mok ◽  
Holly Sze Ho Fung ◽  
Vivian Guo Li
Keyword(s):  
Language Acquisition ◽  
General Principle ◽  
Choice Task ◽  
Factors Affecting ◽  
Tone Pair ◽  
Tone Production ◽  
Monosyllabic Words ◽  
Early Production ◽  
Forced Choice Task ◽  
Production Accuracy

Purpose Previous studies showed early production precedes late perception in Cantonese tone acquisition, contrary to the general principle that perception precedes production in child language. How tone production and perception are linked in 1st language acquisition remains largely unknown. Our study revisited the acquisition of tone in Cantonese-speaking children, exploring the possible link between production and perception in 1st language acquisition. Method One hundred eleven Cantonese-speaking children aged between 2;0 and 6;0 (years;months) and 10 adolescent reference speakers participated in tone production and perception experiments. Production materials with 30 monosyllabic words were transcribed in filtered and unfiltered conditions by 2 native judges. Perception accuracy was based on a 2-alternative forced-choice task with pictures covering all possible tone pair contrasts. Results Children's accuracy of production and perception of all the 6 Cantonese tones was still not adultlike by age 6;0. Both production and perception accuracies matured with age. A weak positive link was found between the 2 accuracies. Mother's native language contributed to children's production accuracy. Conclusions Our findings show that production and perception abilities are associated in tone acquisition. Further study is needed to explore factors affecting production accuracy in children. Supplemental Material https://doi.org/10.23641/asha.7960826

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