EFFECT OF SHADING AND SPRAYING WITH SALICYLIC ACID ON THE PROPERTIES OF YIELD FOR TWO VARIETIES OF POTATO

A field experiment was conducted during the agricultural season autumn 2016 in the experimental field of the Department of horticulture and landscaping in the college of Agriculture – University of Diyala, The study included three factors namely: - Two levels of shading (0%, 50%) by using green saran nets used for 42 day and four concentrations of salicylic acid (0, 50,100,150 mg.L-1) and two varieties of potatoes (Burren and Arizona. The experiment included 16 treatments for using the split – split plots Design system was applied according to the design of the complete random section of R.C.B.D and three replicates. The results showed superiority of plants shaded by 50% in the properties of the number of marketable tubers per plant and average wight of tuber marketable and overally yield and the percentage of protein in the tubers and reduce the content tubers of proline as it reached (9.05tuber.plant-1and 84.64gm and 55.84ton.h1 and 10.793% and 2.229 mg.gm-1) respectively. It was also outperformed treated plants in all concentrations of salicylic acid in the number of properties characterized by them treated plants concentration of 100 mg.L-1 at the best results for properties mentioned above as it reached (9.05tuber.plant-1and 89.56gm and 60.05ton.h-1and 11.084% and 1.869 mg.gm1), respectively. It was also outperformed of cultivar plants Arizona in properties mentioned above as it reached (8.61tuber.plant-1and 83.03gm and 52.98ton.h-1and 10.378% and 2.283mg.gm-1) respectively.

Application of Microfocus Rod Anode in Qualification of Tube-to-Tube-Sheet Welds in Steam Generators

Tube-to-tube-sheet (TTS) welds, occurring in heat exchangers, condensers, and steam generators, are exempted from volumetric nondestructive examination, such as radiography or ultrasonic tests, due to their geometry. An approach of stricter quality control at qualification stage is adopted, apart from tests like liquid penetrant test and leak test applied to production welds. For qualification purpose, a mock up block is destructively examined for weld quality by microscopy and/or macroscopic examination. This paper shows that it is possible to carry out radiography of TTS welds using microfocal x-ray unit with back-throw type rod anode attachment, which sends radiation in nearly radial direction. It demonstrates the use of the same technique for the qualification weld block also. It further shows that the qualification weld slices can be radiographed in axial direction to enable 100% volumetric examination. Besides, it will make metallography more effective and meaningful; instead of a random section, it can then address the plane with a flaw using the help from radiography test. The paper suggests that the code adopt radiography in addition to metallography during qualification for better quality assurance.

The Llandovery—Wenlock Halysitidae from New Brunswick, Canada

A large collection of Silurian halysitids, mainly from the Limestone Point, La Vieille, and Petit Rocher Formations of northern New Brunswick, includes nine species distributed among Catenipora Lamarck, Halysites Fischer von Waldheim, and Cystihalysites Tchernyshev. One species, Cystihalysites belledunensis, is new, and, of the others, half are previously unknown in the Chaleur Bay region and half have been described before from this area.All species are defined using both qualitative and quantitative data. Statistical analysis of serial sections of a corallum of Cystihalysites belledunensis suggests that any random section of a halysitid will yield quantitative data representative of that colony.Preliminary analysis of the relationships between species distributions and stratigraphy and sedimentary associations suggests strong facies-control on the distribution of the four most abundant species. Both Catenipora simplex (Lambe) and Catenipora micropora (Whitfield) occur mostly in outer shelf facies. Cystihalysites belledunensis n. sp. and Cystihalysites encrustans (Buehler) never occur together, the former being found in predominantly high-energy inner shelf facies and the latter in the outer shelf facies.

A principle for counting tissue structures on random sections

A new principle is derived from mathematical considerations which will allow the calculation of the number of bodies contained in the unit volume by counting the number of transections on the unit area of a random section. The simple equation involves two coefficients related to the volumetric density of the bodies in the volume, and to their configuration. Means for the accurate determination of these coefficients are given. The verification of this principle in model experiments showed a high degree of reliability of the method with average errors of estimate of 2–4%. The method has been applied to the counting of alveoli in five normal human lungs, which were found to number an average of 300 million, with a striking constancy from lung to lung. Submitted on May 31, 1961

The orientation of Widmanstetter figures in a random section

The problem of determining the orientation of Widmanstetter figures has recently arisen in a paper by Dr. L. J. Spencer on the Gibeon shower of meteoritic irons in South-West Africa: the method of attacking it to be described here will be applied to the crystals illustrated in plate II of his paper.By producing the faces of a regular octahedron in all possible directions a set of six congruent prisms is formed, as shown in fig. 1. The Widmanstetter figures are the traces of these prisms in a plane of section. The section across any one of the prisms by a plane normal to its axis is a rhomb whose angles are those of a face of the rhombic-dodecahedron, that is to say, 70° 31′ and 109° 28′.