Water Absorption Technology of Gas Drilling

In recent years, the development of super-absorbent material was very fast, its ability to absorb water up to several hundred or even thousands times of its own weight, it provides a new way of gas drilling to solve the water carry problem. According to the characteristic of the formation, we optimized polyacrylic acid salt as the water absorbent material, and evaluate salt resistance, temperature resistance and compression resistance. And we discussed the feasibility and recycling of the technology. And we find that this kind of super-absorbent material which can absorb deionized water 1484 times,absorb 0.9% NaCl aqueous solution 687 times,absorb 50% ethanol 705 times, that can meet the water carrying requirements of gas drilling.

Meridic Diets For Adult Screwworm (Diptera: Calliphoridae)2

Adults of the screwworm, Cochliomyia hominivorax (Coquerel), were fed three carrageenan-gelled meridic diets. In test one, the flies were fed a diet of sucrose and whole dry powdered chicken egg (2:1) and compared with those fed similar formulations containing the sucrose/egg plus nonfat dry powdered milk (2:1:1) or sucrose/egg/milk plus whole bovine blood (2:1:1:2). Body weight, mortality and egg hatch were not significantly (P = 0.05) different among the adults. In a second test the mortality and egg hatch were not significantly different between adults fed the sucrose/egg/milk diet gelled with carrageenan or a synthetic copolymer gel. However, significantly greater egg weights were collected from females fed the formulation containing the copolymer gel. In a third test where the copolymer gel was completely or partially replaced in the diet with an inert, water-absorbent material, egg hatch and mortality were not significantly different among the adults. Egg weights were similar for adults feeding on diet containing the full complement of copolymer gel and those fed diet in which the gel was completely replaced with the inert material. These gelled diets are nutritional and economical and have both small scale and mass production application.