广西发展对外经济关系的制约因素及路径选择

中国—东盟自由贸易区建成将是广西发展对外经济关系的一种新契机、新起点。在现有的诸多机制框架下,广西对外经济关系虽取得了初步的成效,还面临着合作机制的落实难、国际市场的人为分割等一些亟待解决的制约因素。本文对这些问题进行理论剖析,并从构建一体化权威机构、扩大政府目标函数等方面提出了相应的路径选择,以期对在当前全球经济危机影响下,破解对外出口贸易放缓的困境提供有益的参考

Effects of Aluminide and Platinum-Aluminide Coatings on the Hot Corrosion Behavior of MAR-M247 Nickel-Based Superalloy

本文研究MAR-M247镍基超合金表面经铝化涂层或白金铝化涂层处理后,其热腐蚀效应对腐蚀速率与显微组织之影响,并藉试片质量增加量的变化评估抗热腐蚀的能力.铝化涂层之主要组成为-βN iA l相,而白金铝化涂层表面的主要组成为PtA l2相,利用盐喷覆法将Na2SO4被覆在试片表面,置于热处理炉中观测其热腐蚀性.实验得知,铝化涂层和白金铝化涂层均可明显抑制MAR-M247的热腐蚀,且后者之效果更明显,此两种涂层在910℃之Na2SO4环境中的抗蚀性均较MAR-M247合金为佳.This study is to investigate the high temperature hot corrosion behavior of aluminide coating and platinum-aluminide coating on Ni-base superalloy MAR-M247. On the platinum-aluminide, aluminide and the base metal, respectively, by the salt spraying method. The resistances to hot corrosion of platinum-aluminide coating, aluminide coating and the base metal were evaluated by the variations of weight gains. Aluminide and platinum-aluminide coating showed significanty beneficial effect on inhibiting the hot corrosion of MAR-M247. But that of the platinum-aluminide coating was even much better. The aluminide coating surface was composed of β-NiAl, and that of the platinum-aluminide coating was PtAl_(2). Both two phases could provide better resistances to hot corrosion than that of MAR-M247 in Na_(2)SO_(4), at 910℃.作者联系地址：中山科学研究院飞弹火箭研究所,成功大学材料科学及工程学系,成功大学材料科学及工程学系 台湾台北 ,台湾台南 ,台湾台南Author's Address: *1 ,W.T. Tasi~2,J.T. Lee~21. Missile and Rocket Systems Research Division, Chung-Shan Institute of Science & Technology,Taiwan,China;2. Department of Materials Engineering, Cheng-Kung University,Taiwan,Chin

Negative Press Coverage,Litigation Risk and Audit Fees

本文研究媒体负面报道对审计收费的影响,并进一步探讨这种影响的实现路径。利用2001-2009年我国A股主板上市公司的数据研究发现,公司面临的媒体负面报道越多,审计收费越高。进一步分析发现,会计方面的媒体负面报道和首次媒体负面报道会引起审计师提高审计收费,然而这些影响均只存在于高诉讼风险的环境下。此外,本文还发现,无论是高风险阶段还是低风险阶段,媒体负面报道都会使公司容易受到监管部门的行政处罚。本文可能表明,在转型经济中,媒体对审计行为的治理作用可能需通过法律环境的改善来实现。The paperstudies the effect of negative press coverage on audit fee,and further explores the path to achieve this effect.Employing China's A shares mainboard data from 2001 to 2009,we find that the more negative press coverage companies encounter,the higher audit fee auditors charge.Further analysises express that negative press coverage in accounting and first- reported negative press coverage brings about higher audit fees charged by auditors while that only occurs in the high litigation risk period.In addition,whether during the low or high litigation risk period,negative press coverage will bring companies regulatory sanctions more likely.The paper suggests that governance role of the media in audit may be achieved by improving legal environment in transition economy.国家自然科学基金海外及港澳学者合作研究基金项目(71328201); 面上项目(71172206)的中期成果之

酸洗去除冶金硅中的典型杂质

以王水和氢氟酸为酸洗介质,研究酸洗对冶金硅中典型杂质元素的脱除效果。结果表明:王水和氢氟酸对金属类杂质均有明显的去除作用,但对非金属B和P去除效率差。Al杂质经王水和氢氟酸酸洗后去除率分别为80%和86.3%,Fe杂质的去除率分别为78.6%和89.4%。氢氟酸对总杂质去除率比王水提高12%,但其对Cu的去除率仅为4.8%。Cu的相态分析表明:Cu在冶金硅中主要是以Al-Si-Cu合金相存在,抗氢氟酸腐蚀性强。与氢氟酸不同,王水通过化学破碎作用使硅粉粒度变小,利于杂质相暴露。两种酸对硅粉的损失率均小于3.5%

酸洗去除冶金硅中的典型杂质

以王水和氢氟酸为酸洗介质,研究酸洗对冶金硅中典型杂质元素的脱除效果。结果表明：王水和氢氟酸对金属类杂质均有明显的去除作用,但对非金属B和P去除效率差。Al杂质经王水和氢氟酸酸洗后去除率分别为80%和86.3%,Fe杂质的去除率分别为78.6%和89.4%。氢氟酸对总杂质去除率比王水提高12%,但其对Cu的去除率仅为4.8%。Cu的相态分析表明：Cu在冶金硅中主要是以Al-Si-Cu合金相存在,抗氢氟酸腐蚀性强。与氢氟酸不同,王水通过化学破碎作用使硅粉粒度变小,利于杂质相暴露。两种酸对硅粉的损失率均小于3.5%