硬炭因资源丰富、结构稳定及安全性高等优势,已成为钠离子电池常用阳极材料。其中,煤基衍生硬炭受到了广泛的关注。本工作以长焰煤为碳源,硫脲为氮硫源,NaCl为模板,通过两步炭化工艺和杂原子掺杂相结合的方法合成了N和S共掺杂的煤基硬炭...硬炭因资源丰富、结构稳定及安全性高等优势,已成为钠离子电池常用阳极材料。其中,煤基衍生硬炭受到了广泛的关注。本工作以长焰煤为碳源,硫脲为氮硫源,NaCl为模板,通过两步炭化工艺和杂原子掺杂相结合的方法合成了N和S共掺杂的煤基硬炭(NSPC1200)。两步炭化过程在调节碳微晶结构和扩大层间距方面发挥了重要的作用。N和S的共掺杂调节了炭材料的电子结构,赋予其更多的活性位点;此外,引入NaCl作为模板有助于孔结构的构建,有利于电极和电解质之间的接触,从而实现Na+和电子的有效传输。在协同作用下,样品NSPC1200表现出优异的储钠能力,在20 mA g^(−1)电流密度下呈现314.2 mAh g^(−1)的可逆容量。即使在100 mA g^(−1)下循环200次,仍保持224.4 mAh g^(−1)的比容量。这项工作成功实现了策略性调整煤基炭材料微观结构的目标,最终获得了具有优异的电化学性能的硬炭阳极。展开更多
On June 2011, the Beijing Research Institute of Uranium Geology, an Institute within the China National Nuclear Corporation （CNNC）, and the Department of Geology ＆ Mining CNNC carried out a project Scientific Drill...On June 2011, the Beijing Research Institute of Uranium Geology, an Institute within the China National Nuclear Corporation （CNNC）, and the Department of Geology ＆ Mining CNNC carried out a project Scientific Drilling.for Deep Metallogenic Research in the Xiangshan Large Uranium Ore Field. A year later on June 21, the project, representing the first scientific drilling of China＇s uranium, was officially launched, and successfully completed on June 17, 2013. A 2818.88 m of drilling depth has broken the previous record 1200 m of exploration depth.展开更多
Glycation is a non-enzymatic post-translational modification which assigns sugar molecule and residues to a peptide.It is a clinically important attribute to numerous age-related,metabolic,and chronic diseases such as...Glycation is a non-enzymatic post-translational modification which assigns sugar molecule and residues to a peptide.It is a clinically important attribute to numerous age-related,metabolic,and chronic diseases such as diabetes,Alzheimer’s,renal failure,etc.Identification of a non-enzymatic reaction are quite challenging in research.Manual identification in labs is a very costly and timeconsuming process.In this research,we developed an accurate,valid,and a robust model named as Gly-LysPred to differentiate the glycated sites from non-glycated sites.Comprehensive techniques using position relative features are used for feature extraction.An algorithm named as a random forest with some preprocessing techniques and feature engineering techniques was developed to train a computational model.Various types of testing techniques such as self-consistency testing,jackknife testing,and cross-validation testing are used to evaluate the model.The overall model’s accuracy was accomplished through self-consistency,jackknife,and cross-validation testing 100%,99.92%,and 99.88%with MCC 1.00,0.99,and 0.997 respectively.In this regard,a user-friendly webserver is also urbanized to accumulate the whole procedure.These features vectorization methods suggest that they can play a critical role in other web servers which are developed to classify lysine glycation.展开更多
The great Chinese poet Du Fu＇s poetry in the Dang Dynasty has important significance in the development of the world culture. Confucianism is the main theme of his poetry, which penetrates connotation of benevolence,...The great Chinese poet Du Fu＇s poetry in the Dang Dynasty has important significance in the development of the world culture. Confucianism is the main theme of his poetry, which penetrates connotation of benevolence, love of all life and self-cultivation. The famous poet Sun Dayu strived to highlight ideological content and the essence of Confucianism in Du Fu＇s poetry through translation. On the basis of deep understanding of the source text and careful choice of words, Sun Dayu mainly used literal translation, free translation and explanation in order to make the target readers know the spirit of Confucianism. His translation activities showed solicitude for national destiny and historical responsibility.展开更多
In order to promote the development of foreign trade, prevent unqualified commodities from flowing out of China and poor quality commodities from import, China’s departments of commodity inspection have strengthened ...In order to promote the development of foreign trade, prevent unqualified commodities from flowing out of China and poor quality commodities from import, China’s departments of commodity inspection have strengthened their inspection, checking supervision and management of the quality of import and export commodities. According to statistics from the State展开更多
A computational method of constraint stabilization and correction is introduced. The method is based on the Baumgart＇s one-step method. Constraint conditions are addressed to stabilize and correct the solution. Two e...A computational method of constraint stabilization and correction is introduced. The method is based on the Baumgart＇s one-step method. Constraint conditions are addressed to stabilize and correct the solution. Two examples are given to illustrate the results of the method.展开更多
Editor’s Note:In the recent two yearssince ZTE’s NGN prod-uct series were put intomarket,ZTE has maderemarkable achieve-ments in the industry. Al-though a leading vendorin China, ZTE has beencontinuously doing busi-...Editor’s Note:In the recent two yearssince ZTE’s NGN prod-uct series were put intomarket,ZTE has maderemarkable achieve-ments in the industry. Al-though a leading vendorin China, ZTE has beencontinuously doing busi- ness in a prudent and practical way,which has been recognized by govern-ment authorities, carriers and customers.In order to learn more about ZTE’s NGNdevelopment strategy,we interviewedChen Jie, ZTE’s vice president and gen-eral manager of Network Division, aboutZTE’s NGN development strategy, R&Dadvantages and progress.展开更多
为了解决微波无线输能系统中微波源的小型化和高效率需求,提出了一种高效谐波调谐功率振荡器的设计方法,振荡器由晶体管、谐波控制网络、反馈网络和负载网络组成。首先,通过调谐晶体管谐波阻抗以减少漏极电压与电流波形的重叠,从而提高...为了解决微波无线输能系统中微波源的小型化和高效率需求,提出了一种高效谐波调谐功率振荡器的设计方法,振荡器由晶体管、谐波控制网络、反馈网络和负载网络组成。首先,通过调谐晶体管谐波阻抗以减少漏极电压与电流波形的重叠,从而提高其效率;其次,反馈网络与负载网络使用仿真获得的数据合成,两者可独立设计,避免了反馈回路对振荡器输出效率的影响。使用Cree CGH40010F GaN HEMT设计并制作了一款工作在S波段的高效功率振荡器,测试结果表明振荡器在2.445 GHz下成功实现了41.7 dBm的输出功率和79.9%的直流到射频(direct current to radio frequency,DC-RF)转化效率,在偏移载波1 MHz处,相位噪声低至-136 dBc/Hz。该功率振荡器性能优越,在微波无线能量传输系统中具有良好的应用前景。展开更多
文摘硬炭因资源丰富、结构稳定及安全性高等优势,已成为钠离子电池常用阳极材料。其中,煤基衍生硬炭受到了广泛的关注。本工作以长焰煤为碳源,硫脲为氮硫源,NaCl为模板,通过两步炭化工艺和杂原子掺杂相结合的方法合成了N和S共掺杂的煤基硬炭(NSPC1200)。两步炭化过程在调节碳微晶结构和扩大层间距方面发挥了重要的作用。N和S的共掺杂调节了炭材料的电子结构,赋予其更多的活性位点;此外,引入NaCl作为模板有助于孔结构的构建,有利于电极和电解质之间的接触,从而实现Na+和电子的有效传输。在协同作用下,样品NSPC1200表现出优异的储钠能力,在20 mA g^(−1)电流密度下呈现314.2 mAh g^(−1)的可逆容量。即使在100 mA g^(−1)下循环200次,仍保持224.4 mAh g^(−1)的比容量。这项工作成功实现了策略性调整煤基炭材料微观结构的目标,最终获得了具有优异的电化学性能的硬炭阳极。
文摘On June 2011, the Beijing Research Institute of Uranium Geology, an Institute within the China National Nuclear Corporation （CNNC）, and the Department of Geology ＆ Mining CNNC carried out a project Scientific Drilling.for Deep Metallogenic Research in the Xiangshan Large Uranium Ore Field. A year later on June 21, the project, representing the first scientific drilling of China＇s uranium, was officially launched, and successfully completed on June 17, 2013. A 2818.88 m of drilling depth has broken the previous record 1200 m of exploration depth.
基金the Research Management Center,Xiamen University Malaysia under XMUM Research Program Cycle 4(Grant No.XMUMRF/2019-C4/IECE/0012).
文摘Glycation is a non-enzymatic post-translational modification which assigns sugar molecule and residues to a peptide.It is a clinically important attribute to numerous age-related,metabolic,and chronic diseases such as diabetes,Alzheimer’s,renal failure,etc.Identification of a non-enzymatic reaction are quite challenging in research.Manual identification in labs is a very costly and timeconsuming process.In this research,we developed an accurate,valid,and a robust model named as Gly-LysPred to differentiate the glycated sites from non-glycated sites.Comprehensive techniques using position relative features are used for feature extraction.An algorithm named as a random forest with some preprocessing techniques and feature engineering techniques was developed to train a computational model.Various types of testing techniques such as self-consistency testing,jackknife testing,and cross-validation testing are used to evaluate the model.The overall model’s accuracy was accomplished through self-consistency,jackknife,and cross-validation testing 100%,99.92%,and 99.88%with MCC 1.00,0.99,and 0.997 respectively.In this regard,a user-friendly webserver is also urbanized to accumulate the whole procedure.These features vectorization methods suggest that they can play a critical role in other web servers which are developed to classify lysine glycation.
文摘The great Chinese poet Du Fu＇s poetry in the Dang Dynasty has important significance in the development of the world culture. Confucianism is the main theme of his poetry, which penetrates connotation of benevolence, love of all life and self-cultivation. The famous poet Sun Dayu strived to highlight ideological content and the essence of Confucianism in Du Fu＇s poetry through translation. On the basis of deep understanding of the source text and careful choice of words, Sun Dayu mainly used literal translation, free translation and explanation in order to make the target readers know the spirit of Confucianism. His translation activities showed solicitude for national destiny and historical responsibility.
文摘In order to promote the development of foreign trade, prevent unqualified commodities from flowing out of China and poor quality commodities from import, China’s departments of commodity inspection have strengthened their inspection, checking supervision and management of the quality of import and export commodities. According to statistics from the State
基金the National Natural Science Foundation of China (10572021 ,10372053)Basic Research Foundation of Beijing Institute of Tech-nology (BIT-UBF-200507A4206)
文摘A computational method of constraint stabilization and correction is introduced. The method is based on the Baumgart＇s one-step method. Constraint conditions are addressed to stabilize and correct the solution. Two examples are given to illustrate the results of the method.
文摘Editor’s Note:In the recent two yearssince ZTE’s NGN prod-uct series were put intomarket,ZTE has maderemarkable achieve-ments in the industry. Al-though a leading vendorin China, ZTE has beencontinuously doing busi- ness in a prudent and practical way,which has been recognized by govern-ment authorities, carriers and customers.In order to learn more about ZTE’s NGNdevelopment strategy,we interviewedChen Jie, ZTE’s vice president and gen-eral manager of Network Division, aboutZTE’s NGN development strategy, R&Dadvantages and progress.
文摘为了解决微波无线输能系统中微波源的小型化和高效率需求,提出了一种高效谐波调谐功率振荡器的设计方法,振荡器由晶体管、谐波控制网络、反馈网络和负载网络组成。首先,通过调谐晶体管谐波阻抗以减少漏极电压与电流波形的重叠,从而提高其效率;其次,反馈网络与负载网络使用仿真获得的数据合成,两者可独立设计,避免了反馈回路对振荡器输出效率的影响。使用Cree CGH40010F GaN HEMT设计并制作了一款工作在S波段的高效功率振荡器,测试结果表明振荡器在2.445 GHz下成功实现了41.7 dBm的输出功率和79.9%的直流到射频(direct current to radio frequency,DC-RF)转化效率,在偏移载波1 MHz处,相位噪声低至-136 dBc/Hz。该功率振荡器性能优越,在微波无线能量传输系统中具有良好的应用前景。
