Continuous casting of thin slabs is a key state project for 7th and sth five -year plans. On thebasis of foundamental works , CISRI condueted the tests of 102 heats in Lanzhou Steel Works in the periodof January 1991-...Continuous casting of thin slabs is a key state project for 7th and sth five -year plans. On thebasis of foundamental works , CISRI condueted the tests of 102 heats in Lanzhou Steel Works in the periodof January 1991- June 1992. Three slab assortments of 50× 900 mm . 70 × 900 mm , 70 × 500 mm were ex-amined. In June of 1992, 412 t steel of 46 heats were cast with the efficiency of 91. 3 %. This. result meetsthe requiremeni of the state in this period. The mould, hedt transfer . casting technology and factors influ-encing slab’s qualities are investigated as well.展开更多
Mg matrix composites with SiC particles ranging from 5vol%-25vol% were prepared using stirring casting method. Die casting, squeezing casting, and extrusion were applied for inhibiting or eliminating the defects such ...Mg matrix composites with SiC particles ranging from 5vol%-25vol% were prepared using stirring casting method. Die casting, squeezing casting, and extrusion were applied for inhibiting or eliminating the defects such as gas porosity and shrinkage void. Through die casting and squeezing casting, most of the defects in Mg matrix composites could be eliminated, but the mechanical properties were improved limitedly. On the other hand, after hot extrusion, not only most of the defects of as-cast composites ingots were eliminated, but also the mechanical properties were improved markedly. With the addition of SiC, the tensile strength, yield strength and elastic modulus of as extrusion SiCp/AZ61 composites increased remarkably, and the elongation decreased obviously.展开更多
In this paper, to meet the needs of studying work of dynamic mechanical properties of welded joint, the dynamic mechanical properties of welded joint were measured by means of SHPB(Split Hopkinson Pressure Bar).The dy...In this paper, to meet the needs of studying work of dynamic mechanical properties of welded joint, the dynamic mechanical properties of welded joint were measured by means of SHPB(Split Hopkinson Pressure Bar).The dynamic mechanical property's curves of every part of welded joint were obtained. For studying the dynamic behavior of mechanical heterogeneity of welded joint, important data were offered. The method of test creates a new way of studying dynamic mechanical properties of welded joint.展开更多
<span style="font-family:Verdana;">The technological properties of the curing conditions for unsaturated polyesters synthesized on the basis of the alcoholysis products of secondary polyethylene tereph...<span style="font-family:Verdana;">The technological properties of the curing conditions for unsaturated polyesters synthesized on the basis of the alcoholysis products of secondary polyethylene terephthalate and unsaturated polyesters used in the production of fiberglass pipes were studied. It is shown that unsaturated polyesters synthesized on the basis of alcoholysis products can completely replace imported resins of grades 196 and 196A in the production of fiberglass pipes.</span>展开更多
Background/Objective:Nanotechnology is a recent technology,but its application to meat preservation is limited.Materials and Methods:The silver bio-nanoparticle was sythensized from the extract of pawpaw and 1 mM solu...Background/Objective:Nanotechnology is a recent technology,but its application to meat preservation is limited.Materials and Methods:The silver bio-nanoparticle was sythensized from the extract of pawpaw and 1 mM solution of silver nitrate using standard method.Meat samples were treated with solutions containing 10%-20%silver bio-nanoparticle suspension and were kept for 2,4 and 6 h.Protein,crude fat,ash,weight loss,water loss,solid gain,absorbed silver ion,bacterial count and sensory characteristics were determined using standard methods.Results:The protein,crude fat,ash,weight loss,water loss,solid gain,absorbed silver ion and total plate count varied from 21.63%-30.89%,3.71%-4.21%,1.55%-3.98%,0.04 to 0.25 g,0.42-0.84,0.38-0.62,18.00-48.42μg/mL and 2.74×105-1.39×10^(11) cfu/g respectively.The results showed that qualities of meat were positively affected by silver bionanoparticle treatment.Conclusion:Meat treated with10%of silver bio-nanoparticle concentration for 4 h had the best quality.展开更多
文摘Continuous casting of thin slabs is a key state project for 7th and sth five -year plans. On thebasis of foundamental works , CISRI condueted the tests of 102 heats in Lanzhou Steel Works in the periodof January 1991- June 1992. Three slab assortments of 50× 900 mm . 70 × 900 mm , 70 × 500 mm were ex-amined. In June of 1992, 412 t steel of 46 heats were cast with the efficiency of 91. 3 %. This. result meetsthe requiremeni of the state in this period. The mould, hedt transfer . casting technology and factors influ-encing slab’s qualities are investigated as well.
基金Funded by the Program for New Century Excellent Talents in University(NCET-12-1040)the National Natural Science Foundation of China(Nos.50901048 and 51174143)+2 种基金the Key Project of Chinese Ministry of Education(No.2012017)the Program Foundation of Ministry of Education of China(No.20101402110008)Natural Science Foundation of Shanxi(No.2010021022-5)
文摘Mg matrix composites with SiC particles ranging from 5vol%-25vol% were prepared using stirring casting method. Die casting, squeezing casting, and extrusion were applied for inhibiting or eliminating the defects such as gas porosity and shrinkage void. Through die casting and squeezing casting, most of the defects in Mg matrix composites could be eliminated, but the mechanical properties were improved limitedly. On the other hand, after hot extrusion, not only most of the defects of as-cast composites ingots were eliminated, but also the mechanical properties were improved markedly. With the addition of SiC, the tensile strength, yield strength and elastic modulus of as extrusion SiCp/AZ61 composites increased remarkably, and the elongation decreased obviously.
文摘In this paper, to meet the needs of studying work of dynamic mechanical properties of welded joint, the dynamic mechanical properties of welded joint were measured by means of SHPB(Split Hopkinson Pressure Bar).The dynamic mechanical property's curves of every part of welded joint were obtained. For studying the dynamic behavior of mechanical heterogeneity of welded joint, important data were offered. The method of test creates a new way of studying dynamic mechanical properties of welded joint.
文摘<span style="font-family:Verdana;">The technological properties of the curing conditions for unsaturated polyesters synthesized on the basis of the alcoholysis products of secondary polyethylene terephthalate and unsaturated polyesters used in the production of fiberglass pipes were studied. It is shown that unsaturated polyesters synthesized on the basis of alcoholysis products can completely replace imported resins of grades 196 and 196A in the production of fiberglass pipes.</span>
文摘Background/Objective:Nanotechnology is a recent technology,but its application to meat preservation is limited.Materials and Methods:The silver bio-nanoparticle was sythensized from the extract of pawpaw and 1 mM solution of silver nitrate using standard method.Meat samples were treated with solutions containing 10%-20%silver bio-nanoparticle suspension and were kept for 2,4 and 6 h.Protein,crude fat,ash,weight loss,water loss,solid gain,absorbed silver ion,bacterial count and sensory characteristics were determined using standard methods.Results:The protein,crude fat,ash,weight loss,water loss,solid gain,absorbed silver ion and total plate count varied from 21.63%-30.89%,3.71%-4.21%,1.55%-3.98%,0.04 to 0.25 g,0.42-0.84,0.38-0.62,18.00-48.42μg/mL and 2.74×105-1.39×10^(11) cfu/g respectively.The results showed that qualities of meat were positively affected by silver bionanoparticle treatment.Conclusion:Meat treated with10%of silver bio-nanoparticle concentration for 4 h had the best quality.
