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《Computer Standards & Interfaces》2003,25(3):241-251
Adaptable software systems and architectures give the programmer the ability to create applications that might customize themselves to runtime-emerging requirements. Computational reflection is a programming language technique that is commonly used to achieve the development of this kind of systems. Most runtime reflective systems use Meta-Object Protocols (MOPs). However, MOPs restrict the amount of features an application can customize, and the way they can express its own adaptation. Furthermore, this kind of systems uses a fixed programming language: they develop an interpreter, not a whole language-independent platform.What we present in this paper a non-restrictive reflective platform, called nitrO, that achieves a real computational-environment jump, making every application and language feature adaptable at runtime—without any previously defined restriction. Moreover, the platform has been built using a generic interpreter, in which the reflection mechanism is independent of the language selected by the programmer. Different applications may dynamically adapt each other, regardless of the programming language they use. 相似文献
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以3-氯-2-羟丙基三甲基氯化铵(CHPTAC)为阳离子化试剂,对相对分子质量分别为3000~6000 Da的胶原蛋白I及相对分子质量为50 000~80 000 Da的胶原蛋白II进行阳离子化反应,制备了两种阳离子型胶原蛋白絮凝剂,并以高岭土悬浊液为模拟体系,考察了阳离子化前后胶原蛋白的絮凝性能。结果表明,阳离子化能明显提高胶原蛋白的絮凝能力,阳离子化胶原蛋白I及胶原蛋白II对高岭土悬浊液的絮凝效率提高了20%,但阳离子化大大加快了絮凝速度,絮凝时间可缩短到20 min以内。胶原蛋白II阳离子化后的絮凝能力最强,当该絮凝剂投加量为200 mg/L、絮凝时间为20 min时,对高岭土悬浊液的絮凝效率达到80%以上。 相似文献
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研究了普罗维登斯菌和希瓦氏菌两种微生物对Pt(IV)的吸附特性。pH和离子强度条件优化实验结果表明,pH=2.0时吸附效果较好,吸附量分别为58.62和72.20 mg/g;随着离子强度的增加,普罗维登斯菌对Pt(IV)的吸附量增加而希瓦氏菌却降低;Pt(IV)和Pd(II)共存时,两种微生物吸附剂均优先吸附Pd(II)。动力学和等温吸附实验结果表明,普罗维登斯菌吸附Pt(IV)的过程更符合拟二级动力学模型和Langmuir等温模型,说明化学吸附是该过程的限速步骤,且为单分子层吸附,其理论最大吸附量为136.10 mg/g。因此,以上研究结果表明,普罗维登斯菌和希瓦氏菌可以吸附回收溶液中的Pt(IV)离子。 相似文献
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