Trace Length Calculation on PCBs

Eighteen seedless grape genotypes differing in ripening season (early, mid and late) and in seed trace size (small, medium and large) were harvested at 6, 10, 14, 18 and 22 weeks past bloom (wpb). Using embryo rescue techniques it was studied if embryo do abort as the fruit matures and what percent embryos remain viable at later stages. The size of seed trace was also investigated to determine its influence on embryo viability during maturation. It was found that genotype have great influence on embryo culture traits. Late maturing genotypes showed fewer rescued embryos, germinated embryos and transplantable plants than early and mid season ones. The best culture time for grape embryo rescue is 6 and 10 wpb. At these dates, the largest number of embryos, germinated embryos and transplantable plants were obtained. Genotypes with the largest ratio for seed trace weight/seed trace length (i.e., largest density) showed the greatest tendency to have the largest number of ovules with embryos, more germinated embryos and more transplantable plants. The study also showed that it is possible to recover plants from mature fruit harvested late, although at a much reduced rate.

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Estimation of joint trace length probability distribution function in igneous, sedimentary, and metamorphic rocks

Arabian Journal of Geosciences ◽

10.1007/s12517-013-0861-1 ◽

2013 ◽

Vol 7 (6) ◽

pp. 2353-2361 ◽

Cited By ~ 3

Author(s):

Jamal Zadhesh ◽

Seyed-Mohammad Esmaeil Jalali ◽

Ahmad Ramezanzadeh

Keyword(s):

Distribution Function ◽

Probability Distribution ◽

Probability Distribution Function ◽

Metamorphic Rocks ◽

Trace Length

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Numerical Study on Influence of Joint Characters on Rock Mechanical Parameters

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.201-203.2909 ◽

2011 ◽

Vol 201-203 ◽

pp. 2909-2912

Author(s):

Yan Feng Feng ◽

Tian Hong Yang ◽

Hua Wei ◽

Hua Guo Gao ◽

Jiu Hong Wei

Keyword(s):

Rock Mass ◽

Compression Strength ◽

Numerical Study ◽

Process Analysis ◽

Failure Process ◽

Deformation Modulus ◽

Rock Joints ◽

Structured Surfaces ◽

Trace Length ◽

The Impact

Rock mass is the syntheses composed of kinds of structure and structured surfaces. The joint characters is influencing and controlling the rock mass strength, deformation characteristics and rock mass engineering instability failure in a great degree. Through using the RFPA2D software, which is a kind of material failure process analysis numerical methods based on finite element stress analysis and statistical damage theory, the uniaxial compression tests on numerical model are carried, the impact of the trace length of rock joints and the fault throws on rock mechanics parameters are studied. The results showed that with the gradual increase of trace length,compression strength decreased gradually and its rate of variation getting smaller and smaller, the deformation modulus decreased but the rate of variation larger and larger; with the fault throws increasing, the compression strength first increases and then decreases, when the fault throw is equal to the trace length, the deformation modulus is the largest. When the joint trace length is less than the fault throw, the rate of the deformation modulus is greater than that of trace length, but the deformation modulus was not of regular change.

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