CY-61100车床尾座铸造过程仿真优化研究

对CY-61100车床尾座铸件充型及凝固过程进行了数值模拟及优化研究。根据模拟的结果及铸造缺陷预测,改进及优化了尾座浇注系统,在工厂实际浇铸生产应用中取得了良好效果。并由此建立了铸造过程CAE仿真优化技术与传统铸造工艺设计有效结合的先进铸造工艺设计模式。     

Primary and Secondary Distillates as Marine Fuel Oil

The component compositions of marine fuel oils satisfying the requirements of TU 38.401-58-302-2001 (ISO 8217) with maximum inclusion of gasoils from destructive refining of crude oil were developed. Light gasoils replace standard diesel fuel in marine fuel oil. The demulsifiability of light and heavy catalytic and coker gasoils and vacuum distillates I and II was evaluated. Its dependence on not only the content of adsorbed resins and aromatic hydrocarbons in the components of the fuel but also and to a greater degree on their ratio in the disperse system was demonstrated. The higher this ratio is, the lower the demulsifiability of the fuel.__________Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 4, pp. 28 – 31, July – August, 2005.     

Kinetic and morphological study of a magnesium ethoxide‐based Ziegler–Natta catalyst for propylene polymerization

BACKGROUND: Kinetic and morphological aspects of slurry propylene polymerization using a MgCl₂‐supported Ziegler–Natta catalyst synthesized from a Mg(OEt)₂ precursor are investigated in comparison with a ball‐milled Ziegler–Natta catalyst. RESULTS: The two types of catalyst show completely different polymerization profiles: mild activation and long‐standing activity with good replication of the catalyst particles for the Mg(OEt)₂‐based catalyst, and rapid activation and deactivation with severe fragmentation of the catalyst particles for the ball‐milled catalyst. The observed differences are discussed in relation to spatial distribution of TiCl₄ on the outermost part and inside of the catalyst particles. CONCLUSION: The Mg(OEt)₂‐based Ziegler–Natta catalyst is believed to show highly stable polymerization activity and good replication because of the uniform titanium distribution all over the catalyst particles. Copyright © 2008 Society of Chemical Industry     

Root growth and phosphorus and potassium uptake by two corn genotypes in the field

In a field study P and K uptake by two corn (Zea mays L.) genotypes which differed in root growth was investigated. The effect of differences in root growth on P and K uptake was assessed using a mechanistic-mathematical model which describes nutrient uptake by growing plant roots in soil. Nitrogen was applied at 0 and 227 kg ha^–1 to Pioneer 3732 and B73xMo17 corn grown on Raub silt loam (fine-silty, mixed, mesic Aquic Argiudoll) and at 227 kg N ha^–1 to these two genotypes on Chalmers silt loam (finesilty, mixed, mesic, Typic Haplaquoll). Root growth and P and K uptake by the two corn genotypes was measured 31, 47, 75 and 91 d after planting on the Raub and 31, 47, 61 and 75 d after planting on the Chalmers soil.Root growth and P and K uptake by B73xMo17 was greater than that of Pioneer 3732 on N-fertilized Raub soil. On Chalmers soil the difference in root growth between the two genotypes resulted in an increase in K but not P uptake. The higher soil P level of the Chalmers appears to have offset possible differences in P uptake due to root size. There were no differences between the two genotypes in either the percentage of roots with root hairs, or the density or length of root hairs. Phosphorus and K uptake calculated with the simulation models for both corn genotypes on both soils over each of three growth periods agreed with observed P (Y = 0.68X + 1.71; r = 0.944^**) and K (Y = 0.88X + 15.52; r = 0.928^**) uptake. Differences in P and K uptake between B73xMo17 and Pioneer 3732 resulted primarily from the difference in root growth in the topsoil. A high correlation was found between root surface area and P (r = 0.893^**) and K (r = 0.928^**) uptake by both corn genotypes on both the soils.Journal paper No. 10,316 Purdue Univ. Agric. Exp. Stn., W. Lafayette, In 47906. Contribution from the Dep. of Agron. This paper was supported in part by a grant from the Tennessee Valley Authority.     

Microflora of the nasal cavity and its sensitivity to antibiotics in patients with chronic rhinitis treated by cryotherapy

Cryotherapy is used in treatment of chronic rhinitis and pharyngitis. The effect of cryotherapy on the qualitative and quantitative composition of the microflora was studied. Staphylococci prevailed in the rhinitis patients, streptococci, Clebsiella and Neisseria being registered more rarely. The staphlococcal isolates were highly sensitive to monomycin, neomycin, erythromycin and levomycetin. The results of the dynamic study showed that the flora composition did not significantly change during cryotherapy and the sensitivity level of the staphylococcal isolates to the antibodies remained unchanged.     

Clinical precision of the Rinne test

The precision of the Rinne test at 128-2048 Hz was studied in 100 ears with confirmed conductive pathologies. The number of negative (diagnostic) Rinnes decreased significantly with fall in frequency. While there were significantly more negative than positive Rinnes at 128 and 256 Hz, there were significantly more positive results at higher frequencies; indicating that the Rinne is not reliably diagnostic above 256 Hz. However, the possibility of vibrotactile responses must be remembered with low frequency tuning forks. Also, conductive lesions manifested as high tone air-bone gaps will not be identified with low frequency Rinne tests. Air-bone gaps of 25 to 40 dB, depending on frequency, are necessary for the Rinne to identify the presence of conductive components in most cases. Gaps of 25-30 dB for 128 Hz; 35-40 dB for 256 Hz; 55-60 dB for 512 Hz; and 45-50 dB for 1024 Hz, are necessary for the Rinne to meet a 75% correct detection criterion. The 2o48 Hz Rinne does not attain even chance detection. The Rinne test cannot be validly employed as a criterion against which other measures can be evaluated.