Objectives: To explore the relationship between adiponectin (APN) and bone mineral density in this Zhuang ethnic group, thus providing a basis underpinning the prevention and treatment of osteoporosis (OP). Methods: Z...Objectives: To explore the relationship between adiponectin (APN) and bone mineral density in this Zhuang ethnic group, thus providing a basis underpinning the prevention and treatment of osteoporosis (OP). Methods: Zhuang women over 50 years old in Guangxi Zhuang Autonomous Region were included in the study. The broadband ultrasound attenuation (BUA) was adopted as the reference to calculate the T value. Quantitative ultrasonic bone density was measured on the right. Body composition measuring instrument was used to measure weight, fat, and muscle mass. Plasma APN level was detected by ELISA and blood lipids were detected by enzymatic method. Results: Plasma APN level was found with significant differences in the normal bone mineral density group, bone mineral density reduction group, and osteoporosis group (P β = −0.176, P = 0.001) when the partial correlation coefficient of APN is −0.210. Elevated APN was an independent risk factor for bone mineral density reduction (OR = 1.191, 95%CI: 1.004 - 1.407, P = 0.04) and OP (OR = 1.1337, 95%CI: 1.137 - 1.572, P Conclusion: Increased APN in postmenopausal women of Zhuang is an independent risk factor for OP. The application of APN in the OP screening and prevention of middle-aged and ageing Zhuang women still needs further research.展开更多
Active metasurfaces have recently attracted more attention since they can make the light manipulation be versatile and real-time. Metasurfaces-based holography possesses the advantages of high spatial resolution and e...Active metasurfaces have recently attracted more attention since they can make the light manipulation be versatile and real-time. Metasurfaces-based holography possesses the advantages of high spatial resolution and enormous information capacity for applications in optical displays and encryption. In this work, a tunable polarization multiplexing holographic metasurface controlled by an external magnetic field is proposed. The elaborately designed nanoantennas are arranged on the magneto-optical intermediate layer, which is placed on the metallic reflecting layer. Since the non-diagonal elements of the dielectric tensor of the magneto-optical material become non-zero values once the external magnetic field is applied,the differential absorption for the left and right circularly polarized light can be generated. Meanwhile, the amplitude and phase can be flexibly modulated by changing the sizes of the nanoantennas. Based on this, the dynamic multichannel holographic display of metasurface in the linear and circular polarization channels is realized via magnetic control, and it can provide enhanced security for optical information storage. This work paves the way for the realization of magnetically controllable phase modulation, which is promising in dynamic wavefront control and optical information encryption.展开更多
随着海洋资源的利用和开发,人们对高速率水下通信的需求也更加迫切。但水下环境的高频衰减特性和强噪声导致水下信号的传输带宽受限,信号传输速度较慢。同时现有的水下节点间通信通常采用碰撞避免的MAC协议,在一个时隙内只允许一个有效...随着海洋资源的利用和开发,人们对高速率水下通信的需求也更加迫切。但水下环境的高频衰减特性和强噪声导致水下信号的传输带宽受限,信号传输速度较慢。同时现有的水下节点间通信通常采用碰撞避免的MAC协议,在一个时隙内只允许一个有效用户发送数据,因而水声信道的利用率较低。针对上述问题,提出了一种同频时反水下协作通信系统的自信息干扰消除算法。在该水下协作通信系统中,节点可同时通过水下基站向对方发送数据,节点之间共用相同的上行频率和下行频率,实现频谱资源复用。该方法中通过在基站处进行主动时反,消除水声信道传输的多径效应,然后利用节点对自身发射信号已知的特点,消除基站转发信息中的自信息干扰。仿真结果表明,文中所提出方法的误码性能与现有的分时协作通信方法相当,在信噪比为11 d B时,误码率均可以达到10-3,但该方法的传输速度为分时水下协作通信方法的2倍。展开更多
文摘Objectives: To explore the relationship between adiponectin (APN) and bone mineral density in this Zhuang ethnic group, thus providing a basis underpinning the prevention and treatment of osteoporosis (OP). Methods: Zhuang women over 50 years old in Guangxi Zhuang Autonomous Region were included in the study. The broadband ultrasound attenuation (BUA) was adopted as the reference to calculate the T value. Quantitative ultrasonic bone density was measured on the right. Body composition measuring instrument was used to measure weight, fat, and muscle mass. Plasma APN level was detected by ELISA and blood lipids were detected by enzymatic method. Results: Plasma APN level was found with significant differences in the normal bone mineral density group, bone mineral density reduction group, and osteoporosis group (P β = −0.176, P = 0.001) when the partial correlation coefficient of APN is −0.210. Elevated APN was an independent risk factor for bone mineral density reduction (OR = 1.191, 95%CI: 1.004 - 1.407, P = 0.04) and OP (OR = 1.1337, 95%CI: 1.137 - 1.572, P Conclusion: Increased APN in postmenopausal women of Zhuang is an independent risk factor for OP. The application of APN in the OP screening and prevention of middle-aged and ageing Zhuang women still needs further research.
基金supported by the National Key R&D Program of China (Nos. 2021YFB2801803 and 2021YFA1401200)the Natural Science Foundation of Shandong Province(No. ZR2023LZH001)+3 种基金the Beijing Outstanding Young Scientist Program (No. BJJWZYJH01201910007022)the National Natural Science Foundation of China (Nos. U21A20140 and 92050117)the Fok Ying-Tong Education Foundation of China(No. 161009)the Beijing Municipal Science&Technology Commission,Administrative Commission of Zhongguancun Science Park (No. Z211100004821009)。
文摘Active metasurfaces have recently attracted more attention since they can make the light manipulation be versatile and real-time. Metasurfaces-based holography possesses the advantages of high spatial resolution and enormous information capacity for applications in optical displays and encryption. In this work, a tunable polarization multiplexing holographic metasurface controlled by an external magnetic field is proposed. The elaborately designed nanoantennas are arranged on the magneto-optical intermediate layer, which is placed on the metallic reflecting layer. Since the non-diagonal elements of the dielectric tensor of the magneto-optical material become non-zero values once the external magnetic field is applied,the differential absorption for the left and right circularly polarized light can be generated. Meanwhile, the amplitude and phase can be flexibly modulated by changing the sizes of the nanoantennas. Based on this, the dynamic multichannel holographic display of metasurface in the linear and circular polarization channels is realized via magnetic control, and it can provide enhanced security for optical information storage. This work paves the way for the realization of magnetically controllable phase modulation, which is promising in dynamic wavefront control and optical information encryption.
文摘随着海洋资源的利用和开发,人们对高速率水下通信的需求也更加迫切。但水下环境的高频衰减特性和强噪声导致水下信号的传输带宽受限,信号传输速度较慢。同时现有的水下节点间通信通常采用碰撞避免的MAC协议,在一个时隙内只允许一个有效用户发送数据,因而水声信道的利用率较低。针对上述问题,提出了一种同频时反水下协作通信系统的自信息干扰消除算法。在该水下协作通信系统中,节点可同时通过水下基站向对方发送数据,节点之间共用相同的上行频率和下行频率,实现频谱资源复用。该方法中通过在基站处进行主动时反,消除水声信道传输的多径效应,然后利用节点对自身发射信号已知的特点,消除基站转发信息中的自信息干扰。仿真结果表明,文中所提出方法的误码性能与现有的分时协作通信方法相当,在信噪比为11 d B时,误码率均可以达到10-3,但该方法的传输速度为分时水下协作通信方法的2倍。
