On the basis of Preston hypothesis,the motion relationship between tool and workpiece upon the tools motion in planar model is analyzed.The effect on computer controlled optical surfacing (CCOS) caused by controllable...On the basis of Preston hypothesis,the motion relationship between tool and workpiece upon the tools motion in planar model is analyzed.The effect on computer controlled optical surfacing (CCOS) caused by controllable variable is simulated except for the dwelling time,thus,some reference on theory is provided to optimize the former numerical control (NC) model,and fast manufacturing of large departure aspherics is realized.展开更多
In the Pearl River Delta (PRD), there is severe competition between container ports, particularly those in Hong Kong, Shenzhen, and Guangzhou, for collecting international maritime container cargo. In addition, the se...In the Pearl River Delta (PRD), there is severe competition between container ports, particularly those in Hong Kong, Shenzhen, and Guangzhou, for collecting international maritime container cargo. In addition, the second phase of the Nansha terminal in Guangzhou’s port and the first phase of the Da Chang Bay container terminal in Shenzhen opened last year. Under these circumstances, there is an increasing need to quantitatively measure the impact these infrastructure investments have on regional cargo flows. The analysis should include the effects of container terminal construction, berth deepening, and access road construction. The authors have been developing a model for international cargo simulation (MICS) which can simulate the movement of cargo. The volume of origin-destination (OD) container cargo in the East Asian region was used as an input, in order to evaluate the effects of international freight transportation policies. This paper focuses on the PRD area and, by incorporating a more detailed network, evaluates the impact of several infrastructure investment projects on freight movement.展开更多
AA （Alopecia areata） is the most frequent cause of inflammation-induced hair loss, affecting 0.1 to 0.2% of population worldwide. The development of organ-specific autoimmune reactions directed against anagen hair f...AA （Alopecia areata） is the most frequent cause of inflammation-induced hair loss, affecting 0.1 to 0.2% of population worldwide. The development of organ-specific autoimmune reactions directed against anagen hair follicles seems to play a key role in the pathogenesis of alopecia areata. However, the triggering antigen（s） responsible for inducing autoimmune phenomena in these individuals remain unknown. Viral, bacterial or fungal pathogens have been implied as possible triggering factors of autoimmune reactions. The present study aims to identify the role of dematiaceous fungi in the pathogenesis of alopecia areata. 30 patients diagnosed clinically as alopecia areata and 30 normal age matched persons have undergone mycological examination. Mycology examination of the epidermal scrapings was done by DME （direct microscopic examination）, culture on SDA （sabouraud＇s dextrose agar） and imaging. There is significantly higher percentage of positive results for Alternaria species by culture on sabouraud＇s agar in patients group （20%） compared to controls （13.3%） P-value 〈 0.05. The possible role of Alternaria antigens （e.g. antigens involved in melanin synthesis） in triggering autoimmunity in alopecia areata still needs further research on a wider scale of cases.展开更多
文摘On the basis of Preston hypothesis,the motion relationship between tool and workpiece upon the tools motion in planar model is analyzed.The effect on computer controlled optical surfacing (CCOS) caused by controllable variable is simulated except for the dwelling time,thus,some reference on theory is provided to optimize the former numerical control (NC) model,and fast manufacturing of large departure aspherics is realized.
文摘In the Pearl River Delta (PRD), there is severe competition between container ports, particularly those in Hong Kong, Shenzhen, and Guangzhou, for collecting international maritime container cargo. In addition, the second phase of the Nansha terminal in Guangzhou’s port and the first phase of the Da Chang Bay container terminal in Shenzhen opened last year. Under these circumstances, there is an increasing need to quantitatively measure the impact these infrastructure investments have on regional cargo flows. The analysis should include the effects of container terminal construction, berth deepening, and access road construction. The authors have been developing a model for international cargo simulation (MICS) which can simulate the movement of cargo. The volume of origin-destination (OD) container cargo in the East Asian region was used as an input, in order to evaluate the effects of international freight transportation policies. This paper focuses on the PRD area and, by incorporating a more detailed network, evaluates the impact of several infrastructure investment projects on freight movement.
文摘AA （Alopecia areata） is the most frequent cause of inflammation-induced hair loss, affecting 0.1 to 0.2% of population worldwide. The development of organ-specific autoimmune reactions directed against anagen hair follicles seems to play a key role in the pathogenesis of alopecia areata. However, the triggering antigen（s） responsible for inducing autoimmune phenomena in these individuals remain unknown. Viral, bacterial or fungal pathogens have been implied as possible triggering factors of autoimmune reactions. The present study aims to identify the role of dematiaceous fungi in the pathogenesis of alopecia areata. 30 patients diagnosed clinically as alopecia areata and 30 normal age matched persons have undergone mycological examination. Mycology examination of the epidermal scrapings was done by DME （direct microscopic examination）, culture on SDA （sabouraud＇s dextrose agar） and imaging. There is significantly higher percentage of positive results for Alternaria species by culture on sabouraud＇s agar in patients group （20%） compared to controls （13.3%） P-value 〈 0.05. The possible role of Alternaria antigens （e.g. antigens involved in melanin synthesis） in triggering autoimmunity in alopecia areata still needs further research on a wider scale of cases.
