在试验和有限元分析的基础上,介绍了特殊螺纹接头上扣扭矩曲线与接头结构的关系,并完成了宝钢BGT2系列196.85×12.7 mm BG140V BGT2套管气密封特殊螺纹接头的上扣过程的模拟。参照ISO13679(2002)标准要求,针对不同的几何尺寸组合...在试验和有限元分析的基础上,介绍了特殊螺纹接头上扣扭矩曲线与接头结构的关系,并完成了宝钢BGT2系列196.85×12.7 mm BG140V BGT2套管气密封特殊螺纹接头的上扣过程的模拟。参照ISO13679(2002)标准要求,针对不同的几何尺寸组合分别建立有限元模型,并分析其上扣过程扭矩曲线变化,探讨了不同尺寸参数对扭矩曲线形状的影响;同时利用有限元模型计算了该规格产品的屈服扭矩和上扣过程接触力变化。通过与实物试验的对比,验证了该分析结果的可靠性,从而为产品开发和使用提供指导。展开更多
The functioning mechanism of groundwater and its make-up water in the process of ground subsidence was studied from such three aspects as osmotic corrasion, osmotic pressure effect and concretion effect, As to osmotic...The functioning mechanism of groundwater and its make-up water in the process of ground subsidence was studied from such three aspects as osmotic corrasion, osmotic pressure effect and concretion effect, As to osmotic corrasion, its forming conditions, mechanical mechanism and process were analyzed, As to osmotic pressure effect, it was mainly studied from hydrostatic pressurizing effect, sop softening effect and negative pressure sealing effect. Through concretion and saturation of soil, the factors of concretion settlement were analyzed. The results showed that both groundwater and its make-up water are important triggering factors to ground subsidence.展开更多
This study focuses on the characterisation of strength, density, and size of granules produced in various scales of a high shear granulator. Calcium carbonate （Durca165） was used as the feed powder and aqueous polye...This study focuses on the characterisation of strength, density, and size of granules produced in various scales of a high shear granulator. Calcium carbonate （Durca165） was used as the feed powder and aqueous polyethylene glycol （PEG 4000） as the binder. The dried granules were analysed for their strength, density, size distribution, and wall make-up. Granules were produced in granulators with four scales, 1, 5, 50, and 250 L under three scale-up rules of constant tip speed, constant shear stress, and constant Froude number. The results show that regardless of equipment scale, increasing the impeller speed has a great effect on crushing strength and stress. The underlying cause is an increase in granule density due to more consolidation at higher impeller speeds. Wall make-up is significantly reduced to less than 5% as the scale is increased from 1 to 250 L. The results of this study corroborate our previous findings that the constant tip speed rule is the best criterion for scale-up of high shear granulators.展开更多
According to the xenogamous paradigm of cancer origin, pathogenesis and epidemic spread, human cancer is a disease caused by the appearance in the afflicted body of deviant multicellular structures whose cells are agg...According to the xenogamous paradigm of cancer origin, pathogenesis and epidemic spread, human cancer is a disease caused by the appearance in the afflicted body of deviant multicellular structures whose cells are aggressive (gobble the afflicted body;grow and divide without respect to normal limits), invasive (invade and destroy adjacent tissues), metastatic (dispersed over embryogenesis at different locations in the body) and transmissible. The causative agent of the human disease has only just been identified as an ancient, unprecedentedly unique parasitic being that sustains itself at the expense of substances and energy derived from its victim’s body. Presented integrative discovery consists of a more systematic description of main adaptations of cancer causative agent to this specific way of life developed over its evolution. Focus is on the main stages of cancer existence including cancerous invasion of a human body, make-up of the parasite, its self-protection from the victim’s immune defense and regulatory management, disposition of cancer sub-units around afflicted body, the self-management of cancer and its nutrition, communication between dispersed cancer units, physiological synchronization between them, horizontal (reproductive) way of cancer transmission between humans.展开更多
As we all know, Immanuel Kant holds the view that human beings are quintessentially rational creatures; hence, the emotions are not much more than a form of excessive psychological baggage that human beings could do w...As we all know, Immanuel Kant holds the view that human beings are quintessentially rational creatures; hence, the emotions are not much more than a form of excessive psychological baggage that human beings could do without. Indeed, for anyone familiar with the television series Star Trek, it would seem that according to Kant human beings bear a quite striking resemblance to the individual known as Spock who is a Vulcan and thus a completely rational creature who does not have emotions and feelings. For Kant, that is how human beings should be when they are at their very best as rational creatures. Interestingly, a question that mightily presents itself is whether or not evolution supports Kant＇s ideal conception of human beings as quintessentially rational creatures. It is quite clear that, unlike Vulcans, human beings are capable of emotions and feelings. Indeed, the capacity for emotions and feelings clearly constitutes a fundamental part of the biological make-up of human beings. With that reality, there are two primary ways we can go. On the one hand, we can hold that notwithstanding the capacity that human beings have for emotions and feelings, it is nonetheless the case that humans should mightily strive to realize the Kantian conception of the rational self. On the other hand, we can hold that the emotions and feelings play a very profound and fundamental role in the survival and self-realization of human beings. In what follows, I shall offer a number of considerations in support of the second line of thought; for in point of fact, the first option is not really an option given the psychological configuration of human beings.展开更多
文摘在试验和有限元分析的基础上,介绍了特殊螺纹接头上扣扭矩曲线与接头结构的关系,并完成了宝钢BGT2系列196.85×12.7 mm BG140V BGT2套管气密封特殊螺纹接头的上扣过程的模拟。参照ISO13679(2002)标准要求,针对不同的几何尺寸组合分别建立有限元模型,并分析其上扣过程扭矩曲线变化,探讨了不同尺寸参数对扭矩曲线形状的影响;同时利用有限元模型计算了该规格产品的屈服扭矩和上扣过程接触力变化。通过与实物试验的对比,验证了该分析结果的可靠性,从而为产品开发和使用提供指导。
基金financially supported by the National Nature Science Foundation of China (No.50490271)the National Key Technologies R & D Program of China (No.2004BA615A-18).
文摘The functioning mechanism of groundwater and its make-up water in the process of ground subsidence was studied from such three aspects as osmotic corrasion, osmotic pressure effect and concretion effect, As to osmotic corrasion, its forming conditions, mechanical mechanism and process were analyzed, As to osmotic pressure effect, it was mainly studied from hydrostatic pressurizing effect, sop softening effect and negative pressure sealing effect. Through concretion and saturation of soil, the factors of concretion settlement were analyzed. The results showed that both groundwater and its make-up water are important triggering factors to ground subsidence.
基金the EPSRC(Grant No.GR/S25029/01),Borax Europe Ltd.,Hosokawa Micron B.V.,Pfizer Global R&D,and Procter and Gamble for their financial support of this project
文摘This study focuses on the characterisation of strength, density, and size of granules produced in various scales of a high shear granulator. Calcium carbonate （Durca165） was used as the feed powder and aqueous polyethylene glycol （PEG 4000） as the binder. The dried granules were analysed for their strength, density, size distribution, and wall make-up. Granules were produced in granulators with four scales, 1, 5, 50, and 250 L under three scale-up rules of constant tip speed, constant shear stress, and constant Froude number. The results show that regardless of equipment scale, increasing the impeller speed has a great effect on crushing strength and stress. The underlying cause is an increase in granule density due to more consolidation at higher impeller speeds. Wall make-up is significantly reduced to less than 5% as the scale is increased from 1 to 250 L. The results of this study corroborate our previous findings that the constant tip speed rule is the best criterion for scale-up of high shear granulators.
文摘According to the xenogamous paradigm of cancer origin, pathogenesis and epidemic spread, human cancer is a disease caused by the appearance in the afflicted body of deviant multicellular structures whose cells are aggressive (gobble the afflicted body;grow and divide without respect to normal limits), invasive (invade and destroy adjacent tissues), metastatic (dispersed over embryogenesis at different locations in the body) and transmissible. The causative agent of the human disease has only just been identified as an ancient, unprecedentedly unique parasitic being that sustains itself at the expense of substances and energy derived from its victim’s body. Presented integrative discovery consists of a more systematic description of main adaptations of cancer causative agent to this specific way of life developed over its evolution. Focus is on the main stages of cancer existence including cancerous invasion of a human body, make-up of the parasite, its self-protection from the victim’s immune defense and regulatory management, disposition of cancer sub-units around afflicted body, the self-management of cancer and its nutrition, communication between dispersed cancer units, physiological synchronization between them, horizontal (reproductive) way of cancer transmission between humans.
文摘As we all know, Immanuel Kant holds the view that human beings are quintessentially rational creatures; hence, the emotions are not much more than a form of excessive psychological baggage that human beings could do without. Indeed, for anyone familiar with the television series Star Trek, it would seem that according to Kant human beings bear a quite striking resemblance to the individual known as Spock who is a Vulcan and thus a completely rational creature who does not have emotions and feelings. For Kant, that is how human beings should be when they are at their very best as rational creatures. Interestingly, a question that mightily presents itself is whether or not evolution supports Kant＇s ideal conception of human beings as quintessentially rational creatures. It is quite clear that, unlike Vulcans, human beings are capable of emotions and feelings. Indeed, the capacity for emotions and feelings clearly constitutes a fundamental part of the biological make-up of human beings. With that reality, there are two primary ways we can go. On the one hand, we can hold that notwithstanding the capacity that human beings have for emotions and feelings, it is nonetheless the case that humans should mightily strive to realize the Kantian conception of the rational self. On the other hand, we can hold that the emotions and feelings play a very profound and fundamental role in the survival and self-realization of human beings. In what follows, I shall offer a number of considerations in support of the second line of thought; for in point of fact, the first option is not really an option given the psychological configuration of human beings.
