|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | SIS accuracy and service performance of the BDS-3 basic system显示文摘On December 27,2018,the basic system of the third-generation BeiDou navigation satellite system(BDS-3)completed the deployment of its constellation of 18 MEO networking satellites as well as the construction of the operation control system(OCS)and began to provide basic navigation services to users worldwide.Compared with BDS-2,BDS-3 aims to offer users better navigation signals and higher precision with a series of new technologies.For example,the spaceborne atomic clock of BDS-3 is upgraded for higher performance,the Ka-band inter-satellite link is adopted for inter-satellite ranging and communication,and new B1C and B2a signals are broadcast in addition to B1I and B3I signals(compatible with BDS-2).In addition,a 9-parameter model based on a spherical harmonic function is employed for ionospheric delay corrections.Using the observation data from 18 satellites of the basic system,this paper conducts a comprehensive evaluation of the pseudorange measurement characteristics,signal-in-space(SIS)accuracy of navigation messages and global service capability of BDS-3.The results indicate that the pseudorange measurement multipath effect and observation noise of BDS-3 satellites are better than those of BDS-2;additionally,with the support of inter-satellite links,the user range error(URE)of the BDS-3 satellite broadcast ephemeris is better than 10 cm,the precision of the broadcast clock parameter is better than 1.5 ns,and the SIS accuracy is better than 0.6 m overall.Different from the traditional Klobuchar model,the BeiDou global broadcast ionospheric delay correction model(BDGIM)can provide ionospheric delay corrections better than 70%for worldwide single-frequency users.The service capability evaluation of the basic system consists mainly of the accuracy improvement of the B1I and B3I signals according to BDS-2 as well as the global positioning accuracy of the new signals.These results prove that the BDS-3 basic system has achieved the design goal;that is,both the horizontal and the vertical global positioning accuracies are better than 10 m(95%).In the future,6 MEO satellites as well as 3 GEO satellites and 3 IGSO satellites for regional enhancement purposes will be deployed for full operation;consequently,BDS-3 will definitely provide a higher SIS accuracy and better service capability. | JinPing Chen XiaoGong Hu ChengPan Tang ShanShi Zhou YuFei Yang JunYang Pan Hui Ren YueXin Ma QiuNing Tian Bin Wu Yang Yu | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，6： | 14 |
| 2 | Spatiotemporal rotational dynamics of laser-driven molecules显示文摘Molecular alignment and orientation by laser fields has attracted significant attention in recent years,mostly due to new capabilities to manipulate the molecular spatial arrangement.Molecules can now be efficiently prepared for ionization,structural imaging,orbital tomography,and more,enabling,for example,shooting of dynamic molecular movies.Furthermore,molecular alignment and orientation processes give rise to fundamental quantum and classical phenomena like quantum revivals,Anderson localization,and rotational echoes,just to mention a few.We review recent progress on the visualization,coherent control,and applications of the rich dynamics of molecular rotational wave packets driven by laser pulses of various intensities,durations,and polarizations.In particular,we focus on the molecular unidirectional rotation and its visualization,the orientation of chiral molecules,and the three-dimensional orientation of asymmetric-top molecules.Rotational echoes are discussed as an example of nontrivial dynamics and detection of prepared molecular states. | Kang Lin Ilia Tutunnikov Junyang Ma Junjie Qiang Lianrong Zhou Olivier Faucher Yehiam Prior Ilya Sh.Averbukh Jian Wu | 2020 | Advanced Photonics2020，2，2： | 4 |
| 3 | Diagnosis and treatment of infantile malignant solid tumors in Beijing,China:A multicenter 10-year retrospective study显示文摘Importance:Cancer is the main cause of death by disease in children.Children experience the highest incidence of cancer in the first year of life.However,there is no comprehensive registration system for children with tumors in China.Objective:To summarize the diagnosis and treatment of infant cancer and analyze the status of standardized diagnosis and management among several treatment centers in Beijing,China,thereby providing evidence to guide further clinical research.Methods:From January 1,2010 to December 31,2019,patients with newly diagnosed infantile malignant solid tumors were admitted to six large tertiary pediatric solid tumor diagnosis and treatment centers in Beijing.The epidemiology,clinical features,and therapeutic effects of tumors in these patients were analyzed retrospectively.All patients were followed up until March 31,2020.Results:In total,938 patients were enrolled in this study.There were 530 boys(56.5%)and 408 girls(43.5%);the median age was 6.0 months(range,0-12.0 months).The three most common tumors were retinoblastoma in 366 patients(39.0%),neuroblastoma in 266 patients(28.4%),hepatoblastoma in 133 patients(14.2%),and central nervous system tumors in 52 patients(5.5%).The estimated 5-year overall survival rate was 81.3%±1.8%,and the 5-year event-free survival rate was 71.8%±2.9%.The 5-year overall survival rates of non-rhabdomyosarcoma soft tissue sarcoma,neuroblastoma,and retinoblastoma were 100%,88%±2.2%,and 86.9%±2.1%,respectively.The 5-year event-free survival rates were 81.1%±2.7%for neuroblastoma,81.6%±9.8%for non-rhabdomyosarcoma soft tissue sarcoma,and 72.7%±14.1%for extracranial malignant germ cell tumors.Interpretation:The three most common infantile malignant solid tumors were retinoblastoma,neuroblastoma,and hepatoblastoma.Multidisciplinary combined diagnosis and treatment is needed for infantile tumors. | Mei Jin Zhi Tian Yao Xie Zhaoxia Zhang Miao Li YaxiongYu Weiling Zhang Junyang Zhao Huanmin Wang Qi Zeng Long Li Ming Ge Ning Sun Xiaolun Zhang Jian Gong Wanshui Wu Rong Liu Weihong Zhao Dongsheng Huang Xiaoli Ma | 2020 | Pediatric Investigation2020，4，3： | 3 |
| 4 | Data-Driven Discovery of Stochastic Differential Equations显示文摘Stochastic differential equations(SDEs)are mathematical models that are widely used to describe complex processes or phenomena perturbed by random noise from different sources.The identification of SDEs governing a system is often a challenge because of the inherent strong stochasticity of data and the complexity of the system’s dynamics.The practical utility of existing parametric approaches for identifying SDEs is usually limited by insufficient data resources.This study presents a novel framework for identifying SDEs by leveraging the sparse Bayesian learning(SBL)technique to search for a parsimonious,yet physically necessary representation from the space of candidate basis functions.More importantly,we use the analytical tractability of SBL to develop an efficient way to formulate the linear regression problem for the discovery of SDEs that requires considerably less time-series data.The effectiveness of the proposed framework is demonstrated using real data on stock and oil prices,bearing variation,and wind speed,as well as simulated data on well-known stochastic dynamical systems,including the generalized Wiener process and Langevin equation.This framework aims to assist specialists in extracting stochastic mathematical models from random phenomena in the natural sciences,economics,and engineering fields for analysis,prediction,and decision making. | Yasen Wang Huazhen Fang Junyang Jin Guijun Ma Xin He Xing Dai Zuogong Yue Cheng Cheng Hai-Tao Zhang Donglin Pu Dongrui Wu Ye Yuan Jorge Gonçalves Jürgen Kurths Han Ding | 2022 | Engineering2022，，10： | 1 |
| 5 | Thiol Ligand-Modified Au for Highly Efficient Electroreduction of Nitrate to Ammonia显示文摘Electroreduction of nitrate(NO_(3)-)to ammonia(NH_(3))is an environmentally friendly route for NH_(3)production,serving as an appealing alternative to the Haber-Bosch process.Recently,various noble metal-based electrocatalysts have been reported for electroreduction of NO_(3)-.However,the application of pure metal electrocatalysts is still limited by unsatisfactory performance,owing to the weak adsorption of nitrogen-containing intermediates on the surface of pure metal electrocatalysts.In this work,we report thiol ligand-modified Au nanoparticles as the effective electrocatalysts toward electroreduction of NO_(3)-.Specifically,three mercaptobenzoic acid(MBA)isomers,thiosalicylic acid(ortho-MBA),3-mercaptobenzoic acid(meta-MBA),and 4-mercaptobenzoic acid(para-MBA),were employed to modify the surface of the Au nanocatalyst.During the NO_(3)-electroreduction,para-MBA modified Au(denoted as para-Au/C)displayed the highest catalytic activity among these Au-based catalysts.At-1.0 V versus reversible hydrogen electrode(vs RHE),para-Au/C exhibited a partial current density for NH_(3)of 472.2 mA cm^(-2),which was 1.7 times that of the pristine Au catalyst.Meanwhile,the Faradaic efficiency(FE)for NH_(3)reached 98.7%at-1.0 V vs RHE for para-Au/C.The modification of para-MBA significantly improved the intrinsic activity of the Au/C catalyst,thus accelerating the kinetics of NO_(3)-reduction and giving rise to a high NH_(3)yield rate of para-Au/C. | Yuheng Wu Xiangdong Kong Yechao Su Jiankang Zhao Yiling Ma Tongzheng Ji Di Wu Junyang Meng Yan Liu Zhigang Geng Jie Zeng | 2024 | Precision Chemistry2024，2，3： | 0 |
| 6 | Clinical treatment and prognostic observation for different pathological infiltrations in 537 patients with unilateral retinoblastoma显示文摘 | Wang Yizhuo Huang Dongsheng Shi Jitong Ma Jianmin Zhao Junyang Li Bin Xu Xiaolin Hu Huimin Zhou Yan Sun Yongchang | 2014 | Chinese Medical Journal2014，，20： | 0 |
| 7 | Predictable site-selective radical fluorination of tertiary ethers显示文摘In this communication,we disclose the first example of metal-free and site-selective radical fluorination of readily available tertiary alkyl ethers,enabled by synergistic photocatalysis and organocatalysis.This catalytic combination allows for exclusive fluorination of tertiary C–O bonds under mild conditions even in the presence of competing reaction sites.The excellent functional group tolerance affords valuable access to sterically hindered alkyl fluorides through late-stage modification of complex molecules.The successful use of tertiary alkyl ethers in radical fluorination enhances the structural diversity of aliphatic fluorides that can be derived from naturally abundant alcohols. | Junyang Ma Wentao Xu Jin Xie | 2020 | Science China Chemistry2020，63，2： | 0 |
| 8 | Single-cell transcriptomic analysis uncovers intratumoral heterogeneity and drug-tolerant persister in ALK-rearranged lung adenocarcinoma显示文摘Dear Editor,Non-small cell lung carcinoma(NSCLC)accounts for more than 85%of all lung cancers[1].Lung adenocarcinomas(ADCs)arising from never-smokers have been frequently found to be associated with oncogenic driver mutations,including anaplastic lymphoma kinase(ALK)rearrangement.Echinoderm microtubule-associated protein-like 4(EML4)is the most common fusion partner of the ALK gene[2].Tyrosine kinase inhibitors(TKIs)are currently the first-line treatment for advanced EML4-ALKrearranged lung ADC. | Hoi-Hin Kwok Huiyu Li Jiashuang Yang Junyang Deng Nerissa Chui-Mei Lee Timmy Wing-Kuk Au Alva Ko-Yung Sit Michael Kuan-Yew Hsin Stephanie Kwai-Yee Ma LydiaWai-Ting Cheung Luc Girard Junya Fujimoto Ignacio Ivan Wistuba Boning Gao John Dorrance Minna David Chi-Leung Lam | 2023 | Cancer Communications2023，43，8： | 0 |
| 9 | Enzyme@bismuth-ellagic acid:a versatile platform for enzyme immobilization with enhanced acid-base stability显示文摘In situ encapsulation is an effective way to synthesize enzyme@metal–organic framework biocatalysts;however,it is limited by the conditions of metal–organic framework synthesis and its acid-base stability.Herein,a biocatalytic platform with improved acid-base stability was constructed via a one-pot method using bismuth-ellagic acid as the carrier.Bismuth-ellagic acid is a green phenol-based metal–organic framework whose organic precursor is extracted from natural plants.After encapsulation,the stability,especially the acid-base stability,of amyloglucosidases@bismuth-ellagic acid was enhanced,which remained stable over a wide pH range(2–12)and achieved multiple recycling.By selecting a suitable buffer,bismuth-ellagic acid can encapsulate different types of enzymes and enable interactions between the encapsulated enzymes and cofactors,as well as between multiple enzymes.The green precursor,simple and convenient preparation process provided a versatile strategy for enzymes encapsulation. | Junyang Xu Guanhua Liu Ying He Liya Zhou Li Ma Yunting Liu Xiaobing Zheng Jing Gao Yanjun Jiang | 2023 | Frontiers of Chemical Science and Engineering2023，17，6： | 0 |
| 10 | Nickel-Carnosine complex:A new carrier for enzymes immobilization by affinity adsorption显示文摘Immobilization is an effective method to promote the application of enzyme industry for improving the stability and realizing recovery of enzyme.To some extent,the performance of immobilized enzyme depends on the choice of carrier material.Therefore,the development of new carrier materials has been one of the key issues concerned by enzyme immobilization researchers.In this work,a novel organic–inorganic hybrid material,nickel-carnosine complex(NiCar),was synthesized for the first time by solvothermal method.The obtained NiCar exhibits spherical morphology,hierarchical porosity and abundant unsaturated coordination nickel ions,which provide excellent anchoring sites for the immobilization of proteins.His-tagged organophosphate-degrading enzyme(Opd A)and x-transaminase(ω-TA)were used as model enzymes to evaluate the performance of NiCar as a carrier.By a simple adsorption process,the enzyme molecules can be fixed on the particles of NiCar,and the stability and reusability are significantly improved.The analysis of protein adsorption on NiCar verified that the affinity adsorption between the imidazole functional group on the protein and the unsaturated coordination nickel ions on NiCar was the main force in the immobilization process,which provided an idea way for the development of new enzyme immobilization carriers. | Junyang Xu Yanjun Jiang Liya Zhou Li Ma Zhihong Huang Jiafu Shi Jing Gao Ying He | 2021 | Chinese Journal of Chemical Engineering2021，34，10： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员