Drawing Of Section Research Articles

Detailed Seismological Studies the Junction of Different landscapes in South Yakutia

Research objective - determination of the quantitative indicators of seismic wave attenuation on the area of geotechnical landscapes with contrasting properties and the forecast of the seismic intensity impact within the area of study of the linear engineering structure in conditions of permafrost zone. During the research tasks were performed: study of the geotechnical structure of the area, registration of the microseismic disturbance, acceleration graph of the industrial explosions and powerful man-caused sources of the seismic waves. Main hypothesis of the study - contrast saving of the seismic properties of for-mation from geotechnical landscapes of rooted slopes and above floodplain river terrac-es in conditions of the permafrost zone. During the research complex of geophysical and seismological researches was performed, drawing of the geotechnical section confirmed by the drilling data. Results of the study confirmed main hypothesis - major difference of seismic properties of frost soils foundations for joint landscapes has been established.

Round-to-square section drawing through flat idle rolls

Cold drawn metal bars of regular polygonal section are industrially produced by direct drawing from round stock using either a round-to-polygonal section converging die or a drawing head comprising an adjustable set of symmetrically arranged flat idle rolls. In the present work a solution is obtained to determine the roll load and drawing force for steady state direct cold drawing of square section from round stock through flat idle rolls. The results obtained have shown that the drawing force in a case of fair lubrication condition amounts to about 40% of that required for drawing through converging dies, which allows using a drawbench of lower load capacity. The drawing stress is highly influenced by the friction conditions at the roll surface and to a lesser extent by the area reduction ratio and roll diameter, indicating the need for good quality finish and adequate lubrication for the rolls contact surface. The ratio of the drawing stress to the roll mean pressure is independent of friction and increases almost linearly with the increase of area reduction ratio.

Some theoretical considerations for the direct drawing of section rod from round bar

The maximum reduction of area obtainable, when directly drawing section from round bar, is calculated from a lower bound analysis; this reduction is less than that occurring when drawing round rod from round bar. Also it is shown, unlike the drawing of round section from round bar that there must be, for the section to be accurately formed, a minimum reduction in area. An upper bound solution to the problem of the prediction of draw stress ratio for the direct drawing of section is given some consideration and it is shown that the predicted values are higher than those for the drawing of round rod. A lower bound solution for the direct drawing of section is presented in detail and compared with the upper bound solution. Comparison is made also between both the lower and upper bound solutions and with published data on the drawing of round to round, since either of these new theories is applicable to the drawing of a symmetric section with an infinite number of sides. It is shown, that not only can the draw stress be calculated but that the equivalent die angle can be optimised for every relevant combination of the coefficient of friction and reduction of area.

Laboratory-reared larvae of Cancer anthonyi (Decapoda: Brachyura) with a brief description of the internal anatomy of the megalopa

The larval development of Cancer anthonyi Rathbun (Decapoda, Brachyura) is described from laboratory rearing experiments. The external anatomy of the various larval stages is illustrated. A prezoeal stage, 5 zoeal stages and 1 megalopa stage were identified. At 17.5°C it took an average of 32.5 days for the first-stage zoeae to develop through the fifth zoeal stage and molt to the megalopa stage. The general internal anatomy of C. anthonyi larvae is discussed, and a drawing of a parasagittal section of a megalopa-stage larva is included.

Light Ray Tracing Through a Leaf Cross Section

A light ray, incident at about 5 degrees to the normal, is geometrically plotted through the drawing of the cross section of a soybean leaf using Fresnel's equations and Snell's law. The optical mediums of the leaf considered for ray tracing are air, cell sap, chloroplast, and cell wall. The above ray is also drawn through the same leaf cross section considering cell wall and air as the only optical mediums. The values of the reflection and transmission found from ray tracing agree closely with the experimental results obtained using a Beckman DK-2A spectroreflectometer.

Invited PaperDevelopment Of An Optimum StructuralDesign System For Double Hull VLCC

An optimum structural design system for double hull VLCC is developed based on the generalized slope deflection method for the direct calculation and the Hooke & Jeeves direct search method for the optimum design. By dividing the ship structures into longitudinal members, transverse web frame members and transverse bulkhead members, the longitudinal members are designed by the classification rules such as DnV, Lloyd and the transverse web frame members and the transverse bulkhead members are designed by the generalized slope deflection method which incorporated axial deformations into the existing slope deflection method. By this system, several minimum hull weight designs of double hull VLCC of 300,000 DWT are performed. And the design results are compared with existing ships and the automatic drawing of midship section is also provided.

Bahrains oldtidshovedstad gennem 4000 år

Bahrains oldtidshovedstad gennem 4000 år

The poison gland of trygon.—Supplementary note

In a recent communication on the Defensive Spines of Fishes, published in the Philosophical Transactions (Series B, vol. 212), I described the glandular structure in the lateral groove of the caudal spine of Trygon ; and on p. 7 I gave a drawing of a transverse section of the distal portion of the spine, showing lateral processes or projections which appeared to overlap a space containing isolated masses of epithelial cells. The suggestion was made that these lateral flaps of tissue were intended to protect the glandular epithelium in that part of the spine which did not lie in contact with the opposing tail. But it was pointed out that sections showing the epithelium completely filling the space beneath the processes were wanting, and it seemed necessary for the completion of this research that sections should be obtained confirming this point. Through the kindness of Mr. Thomas More, of the Sungei Bulch Estate, Kuala Selangor, Federated Malay States, I received, in very good condition, three small ikan pari in June, 1923. According to Gimlette, in his book Malay Poisons and Charm Cures (p. 117), is the native Malay name for fish, and pari is used collectively for the sting rays, eagle rays and electric rays. The specimens I received were those of the sting ray ( Sengat pari ), and after six months of careful decalcification the spines were ready to imbed and examine. The result of an examination of the sections confirmed the observations I had previously made on the special epithelial structure found in the lateral grooves near the base of the spine, and very fortunately, sections of the distal portion of one of the spines provided a complete picture of the tissue in the groove. These sections, as the accompanying figures will make clear, confirm my supposition as to the function of the lateral processes; the glandular tissue and small masses of secretion are seen completely filling the space which in previous sections only contained isolated groups of cells and secretion. Where the extremities of the processes meet, there is a small space through which portions of coagulated secretion have passed. The secreting cells have been caught in an active state, as in the cell mass are to be seen complete cells, some distended with secretion and others in which only the remnants of a nucleus remain; in fact, all stages of the secreting process can be observed.

Drawing of a Transverse Section through the Optic Chiasma and Sella Turcica to show the Relations of the Pituitary Body.

Drawing of a Transverse Section through the Optic Chiasma and Sella Turcica to show the Relations of the Pituitary Body.