The Hot Universe Baryon Surveyor (HUBS) mission will carry a nested X-ray telescope capable of observing an energy range from 0.5 keV to 2 keV to study hot baryon evolution. In this paper, we report the latest progres...The Hot Universe Baryon Surveyor (HUBS) mission will carry a nested X-ray telescope capable of observing an energy range from 0.5 keV to 2 keV to study hot baryon evolution. In this paper, we report the latest progress in the design and construction of nested X-ray telescopes which were designed to use a three-stage conic-approximation type assembly to simplify the manufacturing process. The mirror substrate is made using the thermal glass slumping method, with mirrors characterized by a root-mean-square roughness of 0.3 nm, with expected high reflectivity and good thermal stability. We also discuss methods of telescope construction and conduct a deformation analysis of the manufactured mirror. The in situ measurement system program is developed to guide the telescope assembly process.展开更多
Data security is a very important part of data transmission over insecure channels connected through high-speed networks. Due to COVID-19, the use of data transmission over insecure channels has increased in an expone...Data security is a very important part of data transmission over insecure channels connected through high-speed networks. Due to COVID-19, the use of data transmission over insecure channels has increased in an exponential manner. Hybrid cryptography provides a better solution than a single type of cryptographical technique. In this paper, nested levels of hybrid cryptographical techniques are investigated with the help of Deoxyribonucleic Acid (DNA) and Paillier cryptographical techniques. In the first level, information will be encrypted by DNA and at the second level, the ciphertext of DNA will be encrypted by Paillier cryptography. At the decryption time, firstly Paillier cryptography will be processed, and then DAN cryptography will be processed to get the original text. The proposed algorithm follows the concept of Last Encryption First Decryption (LEFD) at the time of decryption. The computed results are depicted in terms of tables and graphs.展开更多
【目的】探究沃柑感染黄龙病的田间症状表现及各症状与感染黄龙病的相关性,为种植者尽早鉴别黄龙病树和及时做好黄龙病防控工作提供参考依据。【方法】从广西不同地区沃柑果园采集沃柑黄龙病疑似样品,对样品按症状分类并记录,用试剂盒...【目的】探究沃柑感染黄龙病的田间症状表现及各症状与感染黄龙病的相关性,为种植者尽早鉴别黄龙病树和及时做好黄龙病防控工作提供参考依据。【方法】从广西不同地区沃柑果园采集沃柑黄龙病疑似样品,对样品按症状分类并记录,用试剂盒法提取叶脉和果柱基因组DNA,采用黄龙病亚洲种的16S r DNA特异引物f D1/fD2和OI1/OI2进行巢式PCR(Nested-PCR)扩增,扩增结果在1%琼脂糖凝胶电泳上检测,统计不同症状样品的阳性率。【结果】收集的214份黄龙病疑似样品中,不同症状样品均检出黄龙病亚洲种病原菌,检出阳性率表现为典型红鼻子果=斑驳黄化叶>果蒂稍红果>均匀黄化叶>叶脉黄化叶>僵果>缺锌黄化叶>其他黄化叶>正常叶。各症状类型与感染黄龙病均存在相关性,但存在差异,其中,典型红鼻子果和斑驳黄化叶阳性率均为100.0%,与感染黄龙病相关性最大;其次果蒂稍红果阳性率为90.9%,与感染黄龙病相关性很大;夏、秋梢均匀黄化叶阳性率为46.5%,与感染黄龙病相关性大。沃柑感染黄龙病后症状复杂,大多出现两种以上复合症状,结果树最初症状为出现果蒂稍红果,落果较多,未结果树以夏、秋梢黄化居多,根系容易受损;正常叶阳性率达16.7%,说明沃柑感染黄龙病早期不易显症。【结论】沃柑出现典型红鼻子果和斑驳黄化叶,可田间诊断为黄龙病树;出现果蒂稍红果,并严重落果,基本可田间诊断为黄龙病树;夏、秋梢均匀黄化黄龙病检出率高,但确诊还需与其他疑似症状(叶脉黄化叶、僵果、缺锌黄化叶、其他黄化叶和正常叶)一样通过PCR进一步检测。Nested-PCR检测技术灵敏性高,可作为沃柑感染黄龙病的早期鉴定技术。展开更多
基金supported by National Key R&D Program of China (2022YFF0709101)China National Space Administration (D050104)National Natural Science Foundation of China (62105244 and U2030111)。
文摘The Hot Universe Baryon Surveyor (HUBS) mission will carry a nested X-ray telescope capable of observing an energy range from 0.5 keV to 2 keV to study hot baryon evolution. In this paper, we report the latest progress in the design and construction of nested X-ray telescopes which were designed to use a three-stage conic-approximation type assembly to simplify the manufacturing process. The mirror substrate is made using the thermal glass slumping method, with mirrors characterized by a root-mean-square roughness of 0.3 nm, with expected high reflectivity and good thermal stability. We also discuss methods of telescope construction and conduct a deformation analysis of the manufactured mirror. The in situ measurement system program is developed to guide the telescope assembly process.
文摘Data security is a very important part of data transmission over insecure channels connected through high-speed networks. Due to COVID-19, the use of data transmission over insecure channels has increased in an exponential manner. Hybrid cryptography provides a better solution than a single type of cryptographical technique. In this paper, nested levels of hybrid cryptographical techniques are investigated with the help of Deoxyribonucleic Acid (DNA) and Paillier cryptographical techniques. In the first level, information will be encrypted by DNA and at the second level, the ciphertext of DNA will be encrypted by Paillier cryptography. At the decryption time, firstly Paillier cryptography will be processed, and then DAN cryptography will be processed to get the original text. The proposed algorithm follows the concept of Last Encryption First Decryption (LEFD) at the time of decryption. The computed results are depicted in terms of tables and graphs.
文摘【目的】探究沃柑感染黄龙病的田间症状表现及各症状与感染黄龙病的相关性,为种植者尽早鉴别黄龙病树和及时做好黄龙病防控工作提供参考依据。【方法】从广西不同地区沃柑果园采集沃柑黄龙病疑似样品,对样品按症状分类并记录,用试剂盒法提取叶脉和果柱基因组DNA,采用黄龙病亚洲种的16S r DNA特异引物f D1/fD2和OI1/OI2进行巢式PCR(Nested-PCR)扩增,扩增结果在1%琼脂糖凝胶电泳上检测,统计不同症状样品的阳性率。【结果】收集的214份黄龙病疑似样品中,不同症状样品均检出黄龙病亚洲种病原菌,检出阳性率表现为典型红鼻子果=斑驳黄化叶>果蒂稍红果>均匀黄化叶>叶脉黄化叶>僵果>缺锌黄化叶>其他黄化叶>正常叶。各症状类型与感染黄龙病均存在相关性,但存在差异,其中,典型红鼻子果和斑驳黄化叶阳性率均为100.0%,与感染黄龙病相关性最大;其次果蒂稍红果阳性率为90.9%,与感染黄龙病相关性很大;夏、秋梢均匀黄化叶阳性率为46.5%,与感染黄龙病相关性大。沃柑感染黄龙病后症状复杂,大多出现两种以上复合症状,结果树最初症状为出现果蒂稍红果,落果较多,未结果树以夏、秋梢黄化居多,根系容易受损;正常叶阳性率达16.7%,说明沃柑感染黄龙病早期不易显症。【结论】沃柑出现典型红鼻子果和斑驳黄化叶,可田间诊断为黄龙病树;出现果蒂稍红果,并严重落果,基本可田间诊断为黄龙病树;夏、秋梢均匀黄化黄龙病检出率高,但确诊还需与其他疑似症状(叶脉黄化叶、僵果、缺锌黄化叶、其他黄化叶和正常叶)一样通过PCR进一步检测。Nested-PCR检测技术灵敏性高,可作为沃柑感染黄龙病的早期鉴定技术。
