Hydrodynamic analysis of a semi-submersible wind-tidal combined power generation device

Energy shortages and environmental pollution are becoming increasingly severe globally. The exploitation and utilization of renewable energy have become an effective way to alleviate these problems. To improve power production capacity, power output quality, and cost effectiveness, comprehensive marine energy utilization has become an inevitable trend in marine energy development. Based on a semi-submersible wind–tidal combined power generation device, a three-dimensional frequency domain potential flow theory is used to study the hydrodynamic performance of such a device. For this study, the RAOs and hydrodynamic coefficients of the floating carrier platform to the regular wave were obtained. The influence of the tidal turbine on the platform in terms of frequency domain was considered as added mass and damping. The direct load of the tidal turbine was obtained by CFX. FORTRAN software was used for the second development of adaptive query workload aware software, which can include the external force. The motion response of the platform to the irregular wave and the tension of the mooring line were calculated under the limiting condition (one mooring line breakage). The results showed that the motion response of the carrier to the surge and sway direction is more intense, but the swing amplitude is within the acceptable range. Even in the worst case scenario, the balance position of the platform was still in the positioning range, which met the requirements of the working sea area. The safety factor of the mooring line tension also complied with the requirements of the design specification. Therefore, it was found that the hydrodynamic performance and motion responses of a semi-submersible wind–tidal combined power generation device can meet the power generation requirements under all design conditions, and the device presents a reliable power generation system

The Mechanism of Antifungal Action of Essential Oil from Dill (Anethum graveolens L.) on Aspergillus flavus

The essential oil extracted from the seeds of dill (Anethum graveolens L.) was demonstrated in this study as a potential source of an eco-friendly antifungal agent. To elucidate the mechanism of the antifungal action further, the effect of the essential oil on the plasma membrane and mitochondria of Aspergillus flavus was investigated. The lesion in the plasma membrane was detected through flow cytometry and further verified through the inhibition of ergosterol synthesis. The essential oil caused morphological changes in the cells of A. flavus and a reduction in the ergosterol quantity. Moreover, mitochondrial membrane potential (MMP), acidification of external medium, and mitochondrial ATPase and dehydrogenase activities were detected. The reactive oxygen species (ROS) accumulation was also examined through fluorometric assay. Exposure to dill oil resulted in an elevation of MMP, and in the suppression of the glucose-induced decrease in external pH at 4 µl/ml. Decreased ATPase and dehydrogenase activities in A. flavus cells were also observed in a dose-dependent manner. The above dysfunctions of the mitochondria caused ROS accumulation in A. flavus. A reduction in cell viability was prevented through the addition of L-cysteine, which indicates that ROS is an important mediator of the antifungal action of dill oil. In summary, the antifungal activity of dill oil results from its ability to disrupt the permeability barrier of the plasma membrane and from the mitochondrial dysfunction-induced ROS accumulation in A. flavus

Bu ren za zhi hui bian, [2 juan]

Mode of access: Internet

Bu xing er yan zhong bu ting ze guo wang /

Mode of access: Internet

Youwei Kang's calligraphic couplet hanging scroll - 康有為對聯

Youwei Kang, known as Guangxia (courtesy name) and Changsu or Tianyouhuaren (pseudonym), was born in Guangdong, China. Kang is a renowned politician, philosopher of Neo-Confucian and educator in the late Qing dynasty. Kang was an imperial scholar during the era of Emperor Guangxu (1875-1908). Influenced by western political science, Kang worked with Qichao Liang (1873-1929) and established "Society for the Study of National Strengthening". They started Hundred Days’ Reform in 1898. The reform failed due to the intervention of Empress Dowager Cixi (1835-1908). Kang advocated ideas of constitutional monarchy and is opposed to establishing the Republic of China. After Hsinhai Revolution (a movement against imperial power of Qing dynasty, 1911-1912), Kang served as a leader of “Save the Emperor Society”. He planned to restore Puyi (1906-1967, the last emperor of Qing dynasty), which destroys his teacher-student relationship with Liang. In his late life, Kang still claimed loyalty to imperial authority.康有為，字廣夏，號長素、天游化人，廣東人。中國著名政治家、新儒家思想家、教育家。光緒年間進士，受到西方政治思想影響，曾與梁啟超組織保國會，合作戊戌變法，因慈禧太后干預而失敗。變法失敗後，康有為主張開明專制，反對革命，在辛亥革命發生後，仍計劃將溥儀復辟，成為當時保皇派主要領袖因而與梁啟超師生關係破裂。晚年仍宣稱忠於清朝皇帝，於1927逝世於青島。This poem suggests Kang’s ideology of being a scholar. Flowers and bamboos are used as metaphor for the core of a scholar. In this scroll, the second seal “After Hundred Days’ Reform, I spent sixteen years in exile, traveling all over the world three times, visiting four continents, passing through thirty-one countries and walking one hundred thousand miles” is upside down.此詩句表現文人所追求的修養和思想上的意境. 作者印章「維新白日出亡十六年三周大地游遍四洲經三十一國行六十萬裡鑒」上下顛倒.Flowers and bamboos symbolize spirit of elegance and being aloof from worldly pursuits. A status with virtue of grace and being indifferent to fame is where my heart goes to.花竹多高逸；澹然心所欣。Signature: Tianyouhuaren款識: 天游化人1) Seal of Youwei Kang; 2) After Hundred Days’ Reform, I spent sixteen years in exile, traveling all over the world three times, visiting four continents, passing through thirty-one countries and walking one hundred thousand miles; 3) TseTsung Chow1) 康有為印; 2) 維新白日出亡十六年三周大地游遍四洲經三十一國行六十萬里; 3) 周策