Determination of the allowable maximum size of the obstacle while dragging a pipeline

2018 ◽  
Vol 13 (3) ◽  
pp. 42-46
Author(s):  
I.N. Krioni ◽  
A.V. Semenova
Keyword(s):  
Maximum Size ◽  
Moment Equilibrium ◽  
Free Area

In this article, the process of overcoming the stony obstacle while dragging pipeline through the channel is considered. Depending on the size of the duct and the pipeline itself the permissible size of the obstacle that the pipeline can overcome without resting against the upper part of the channel, is considered. To solve this problem, the pipeline is conditionally divided into two sections: the site located up to the obstacle and resting on it, and a free area that is after the obstacle. Directly on the process of dragging through an obstacle are acting the forces and moments which have influence on the pipeline. Starting from the equations of moment equilibrium for different points of the pipeline, and also from the equations of bending beams the value of the obstacle is evaluated.

Pattern of the B4C Ceramics Surface Deformation at Local Loading

2013 ◽  
Vol 872 ◽  
pp. 60-64 ◽  
Author(s):  
Edgar S. Dvilis ◽  
Oleg L. Khasanov ◽  
Zulfa G. Bikbaeva ◽  
Valentina V. Polisadova ◽  
Vasiliy K. Struts ◽  
...  
Keyword(s):  
Boron Carbide ◽  
Surface Deformation ◽  
Maximum Size ◽  
Ceramic Materials ◽  
Monocrystalline Silicon ◽  
Experimental Results ◽  
Spall Fracture ◽  
Small Cracks ◽  
Carbide Ceramics

Formation of cracks in the lateral indentation of brittle ceramic materials is described in several researches [1, 2]. Occurrence of such cracks and the associated side small cracks formed at the surface of the sample in the form of "petals" was observed and analyzed in this research on the samples of boron carbide ceramics and monocrystalline silicon. The experimental results for the determination of the sequence, the direction and nature of crack propagation, the size and shape of areas of spall fracture surface formed at indentation of monocrystalline silicon and polycrystalline boron carbide samples by scanning electron microscopy are presented. A comparison of the experimental results with the modeling results of indentation zone deformation, as well as analytical evaluation of the shapes and the maximum size of the spall fracture zones have been carried out, which showed good coincidence.

Methods For Seizure Of Land Plots For Urban Needs

2019 ◽  
pp. 90-92
Keyword(s):  
Maximum Size ◽  
Housing Construction ◽  
Mathematical Apparatus ◽  
Land Plot ◽  
The City ◽  
Urban Programs ◽  
Free Area

When implementing housing construction programs, it is necessary to have a single methodological justification for explaining the choice of a specific land plot for withdrawal for urban needs. The author's method of determining the size of the land plot, which is planned to withdraw for the implementation of the city programs, is proposed. Two situations in which it is expedient to use this procedure are considered. The first is when the city needs to determine the maximum size of the free area, which should be negotiated with the owner, based on a set of factors. The second is when the city can carry out the seizure of land for the implementation of urban programs with due regard for the commercial interests of the owner. The use of the proposed mathematical apparatus of the procedure is illustrated by specific examples.

OVULATION AND CORPUS LUTEUM FUNCTION IN THE LLAMA (LAMA GLAMA)

1969 ◽  
Vol 45 (4) ◽  
pp. 505-513 ◽  
Author(s):  
B. G. ENGLAND ◽  
W. C. FOOTE ◽  
D. H. MATTHEWS ◽  
ARMANDO G. CARDOZO ◽  
S. RIERA
Keyword(s):  
Luteinizing Hormone ◽  
Corpus Luteum ◽  
Breeding Season ◽  
Luteal Phase ◽  
Maximum Size ◽  
Chorionic Gonadotrophin ◽  
Human Chorionic Gonadotrophin ◽  
Corpora Lutea ◽  
Lama Glama

SUMMARY Results in 53 llamas (33 mated animals and 20 controls) showed that ovulation is copulation-induced in this species. Ovulation without copulation occasionally occurred during the height of the recognized breeding season in Bolivia. The first mating during the luteal phase (12–24 days after the preceding ovulation) resulted in ovulation in four out of ten llamas. Determination of pituitary luteinizing hormone (LH) content showed the highest level on the day before mating (9·00 μg./mg.) and the lowest level on day 4 (6·25 μg./mg.). LH level on day 8 was significantly higher than on day 4 (7·62 μg./mg.). Corpora lutea (c.l.) were well formed on day 4 after mating (408 mg.), reached a maximum size by day 8 (1920 mg.) and rapidly decreased in size to day 16 (136 mg.). The corpus albicans remained as an entity but decreased in size to 21 mg. on day 120. Similar changes were found in c.l. histology and progesterone content. The combined results indicate that the functional life of the c.l. in a non-pregnant llama is 16 days or less. Treatment with 25 i.u. human chorionic gonadotrophin was sufficient to cause ovulation in 50% of the animals treated. A large (150 mg.) dose of norethandrolone did not cause morphological regression of the c.l. when measured 5 days after treatment. Treatment with 5 mg. daily for 14 days caused regression of c.l. as compared with untreated controls and animals treated with oestradiol valerate.

470. The distribution of fat-globule size in sow's milk: I. The effect of sampling at intervals throughout milking

1952 ◽  
Vol 19 (2) ◽  
pp. 127-132 ◽  
Author(s):  
W. G. Whittlestone
Keyword(s):  
Size Distribution ◽  
Slow Rate ◽  
Maximum Size ◽  
Distribution Patterns ◽  
Size Group ◽  
Improved Method ◽  
Globule Size ◽  
Fat Globule ◽  
Maximum Group

An improved method for the determination of fat-globule size distribution has been worked out and applied to samples of sow's milk drawn sequentially. The distribution patterns for the globule sizes of sow's milk have been determined. Globules range in size from less than ½μ to over 7μ. The maximum number of globules occurs at different sizes in different sows, the largest maximum size group so far recorded being 2–2·5μ, the smallest maximum group being 0–0·5μ. There is no marked trend in size with stage of milking, though usually the maximum size is less for later milkings if it changes.The strippings of sow's milk, unlike those of the cow, do not appear to be richer in fat than the earlier milk. Also unlike the cow, the globules of sow's milk do not cluster or clump (see Fig. 1). This explains the slow rate of creaming of sow's milk.

scholarly journals Optimization of Compaction Quality Control in the Core of Random Fillings within Linear Infrastructures: Application to Metamorphic Slate Fillings

2021 ◽  
Vol 13 (19) ◽  
pp. 10957
Author(s):  
Evelio Teijón-López-Zuazo ◽  
Ángel Vega-Zamanillo ◽  
Miguel Ángel Calzada-Pérez ◽  
Luis Juli-Gándara
Keyword(s):  
Quality Control ◽  
Maximum Size ◽  
Test Procedures ◽  
The Core ◽  
High Particle ◽  
Use Of Resources ◽  
Compaction Control ◽  
New Research ◽  
Construction Efficiency

The construction of random fillings from the excavation of medium hardness rocks, with high particle sizes, presents limitations in compaction control. This research applies new control techniques with revised test procedures in the construction of the random fillings core, which constitutes the main part of the embankment, with the bigger volume and provides the geotechnical stability to the infrastructure. The maximum thickness over each of the compacted layers researched that made up the random fillings was 800 mm. As there are many types of rocks, this research is applied to metamorphic slates. Quality control was carried out by applying new research associated with the revision of wheel impression test, topographic settlements, and plate bearing test (PBT). Thus, new test procedures are established, defining efficient thresholds. Comparisons make it possible to choose representative tests, avoiding duplication. The optimization of control reduces inspection times, ensuring quality adapted to the high construction efficiency of diggings. Traditionally, rocks were rejected due to their maximum size, underutilizing the use of high-quality materials. Promoting their utilization implies a better use of resources, and therefore, a higher environmental efficiency. A statistical analysis of the core of 16 slate random fillings was carried out, with a total of 2250 in situ determination of density and moisture content, 75 wheel impression tests, 75 topographic settlement controls, and 75 PBT. The strong associations found between different tests allowed to simplify the quality control.

scholarly journals Determination of Size Distribution and Probable Maximum Size of Inclusions in AISI304 Stainless Steel

2013 ◽  
Vol 53 (11) ◽  
pp. 1968-1973 ◽  
Author(s):  
Yuichi Kanbe ◽  
Andrey Karasev ◽  
Hidekazu Todoroki ◽  
Pär Göran Jönsson
Keyword(s):  
Stainless Steel ◽  
Size Distribution ◽  
Maximum Size

A limnological survey of the Ablation Point area, Alexander Island, Antarctica

1977 ◽  
Vol 279 (963) ◽  
pp. 39-54 ◽  
Keyword(s):  
Biological Samples ◽  
New Genera ◽  
Ice Shelf ◽  
Open Sea ◽  
The Antarctic ◽  
Limnological Survey ◽  
Free Area

The ice-free area around Ablation Point (70° 49' S, 68° 25' W) is of particular limnological interest. Numerous ponds and pools lie on coastal moraines and large, permanently ice-covered lakes lie in the valleys. Two of the lakes are unusual in that they are in contact with seawater from George VI Sound which is covered by an ice shelf, 100-500 m thick, and which separates Alexander Island from the Antarctic mainland. Evidence for the existence of a marine biome, 100 km from the open sea, was obtained from one lake. Freshwater biological samples added new genera to Antarctic lists, extended the known range of species, and illustrated the important role of isolation in the determination of antarctic biocoeneses.

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