It is shown that any multicriteria problem can be represented by a hierarchical system of criteria. Individual properties of the object (alternative) are evaluated at the bottom level of the system, using a criteria v...It is shown that any multicriteria problem can be represented by a hierarchical system of criteria. Individual properties of the object (alternative) are evaluated at the bottom level of the system, using a criteria vector. A composition mechanism is used to evaluate the object as a whole at the top level. The problem is solved by the method of nested scalar convolutions of vector-valued criteria. The methodology of the problem solving is based on the complementarity principle by N. Bohr and the theorem of incompleteness by K. G?del. An example is presented that helps the reader digest some of the intricacies in the methodology.展开更多
Edible bird＇s nest （EBN） is derived from the saliva of certain types of swiflets. It is consumed in many parts of the world for its nutritional and medicinal values. Although many claims have been made on the thera...Edible bird＇s nest （EBN） is derived from the saliva of certain types of swiflets. It is consumed in many parts of the world for its nutritional and medicinal values. Although many claims have been made on the therapeutic and health- promoting effects of EBN, scientific documentations regarding these effects are very limited in published literature. It is not until recently that the biological effects of EBN are being investigated and evidence-based studies are being conducted. Several studies have found that EBN may enhance cell proliferation and differentiation and various beneficial effects have been reported in vitro as well as in vivo. While these studies point towards the potential use of EBN in the treatment or even prevention of several diseases, the mechanisms of action of EBN remain largely unknown and more explorations are needed. This review is one of the very few scientific reviews onEBN which focuses on recent evidence-based discoveries.展开更多
针对某炼油厂柴油加氢精制单元床层压力降升高的问题,对反应器顶部保护剂颗粒及颗粒间沉积的粉末进行取样。采用X射线衍射仪、X射线荧光光谱仪、碳-硫分析仪、扫描电子显微镜等对样品进行表征。结果表明,反应器床层压力降升高的主要原...针对某炼油厂柴油加氢精制单元床层压力降升高的问题,对反应器顶部保护剂颗粒及颗粒间沉积的粉末进行取样。采用X射线衍射仪、X射线荧光光谱仪、碳-硫分析仪、扫描电子显微镜等对样品进行表征。结果表明,反应器床层压力降升高的主要原因是原料中的Fe, Ca, Si, P含量超标。Fe, Ca等杂质从保护剂表面脱落,填充在保护剂颗粒之间,导致反应器床层压力降升高;含磷化合物、含硅化合物不易被保护剂拦截,极易穿透至催化剂床层,造成加氢催化剂永久性失活。展开更多
文摘It is shown that any multicriteria problem can be represented by a hierarchical system of criteria. Individual properties of the object (alternative) are evaluated at the bottom level of the system, using a criteria vector. A composition mechanism is used to evaluate the object as a whole at the top level. The problem is solved by the method of nested scalar convolutions of vector-valued criteria. The methodology of the problem solving is based on the complementarity principle by N. Bohr and the theorem of incompleteness by K. G?del. An example is presented that helps the reader digest some of the intricacies in the methodology.
文摘Edible bird＇s nest （EBN） is derived from the saliva of certain types of swiflets. It is consumed in many parts of the world for its nutritional and medicinal values. Although many claims have been made on the therapeutic and health- promoting effects of EBN, scientific documentations regarding these effects are very limited in published literature. It is not until recently that the biological effects of EBN are being investigated and evidence-based studies are being conducted. Several studies have found that EBN may enhance cell proliferation and differentiation and various beneficial effects have been reported in vitro as well as in vivo. While these studies point towards the potential use of EBN in the treatment or even prevention of several diseases, the mechanisms of action of EBN remain largely unknown and more explorations are needed. This review is one of the very few scientific reviews onEBN which focuses on recent evidence-based discoveries.
文摘针对某炼油厂柴油加氢精制单元床层压力降升高的问题,对反应器顶部保护剂颗粒及颗粒间沉积的粉末进行取样。采用X射线衍射仪、X射线荧光光谱仪、碳-硫分析仪、扫描电子显微镜等对样品进行表征。结果表明,反应器床层压力降升高的主要原因是原料中的Fe, Ca, Si, P含量超标。Fe, Ca等杂质从保护剂表面脱落,填充在保护剂颗粒之间,导致反应器床层压力降升高;含磷化合物、含硅化合物不易被保护剂拦截,极易穿透至催化剂床层,造成加氢催化剂永久性失活。
