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Number-phase quantization of a mesoscopic RLC circuit

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Chinese Physics B 2012年第2期21卷 114-116页

作者： xu cheng-Lin Department of Mathematics Yunnan Normal UniversityKunming 650092China

With the help of the time-dependent Lagrangian for a damped harmonic oscillator, the quantization of mesoscopic RLC circuit in the context of a number-phase quantization scheme is realized and the corresponding Hamiltonian operator is obtained. Then the evolution of the charge number and phase difference across the capacity are obtained. It is shown that the number-phase analysis is useful to tackle the quantization of some mesoscopic circuits and dynamical equations of the corresponding operators.

关键词： mesoscopic RLC circuit number-phase quantization Lagrangian function

Dry modification of electrode materials by roller vibration milling at room temperature

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Particuology 2008年第5期6卷 383-388页

作者： Shengjuan Li Shulin Wang bo xu Department of Power Engineering University of Shanghai for Science and Technology 516 Jungong Road Shanghai 200093 China

For the first time dry roller vibration milling at room temperature was used to prepare active carbon （AC） nano-particles and to modify MnO2 powder as electrode materials. In 30 min AC was milled to a mean particle size of 30-50 nm with increased crystallinity and higher specific surface area, predominantly mesoporous and with improved pore diameter distribution. Then, AC nano-particles were incorporated with MnO2 or bismuth-doped MnO2 nano-particles synthesized by sol-gel methods to prepare nano-composite electrode materials for studying their electrochemical performance. The AC nano-particles combined with 10 wt.% bismuth-doped MnO2 nano-particles were found to possess excellent electrochemical property with specific capacitance up to 308 F/g and without obvious attenuation with increasing current. Our method seems to ooen a new way to imorove AC based electrode materials used for clean energy such as suner capacitors.

关键词： Active carbon Roller vibration milling Electrode materials Nano-materials Super-capacitors

Feasibility study of autonomous orbit determination using only the crosslink range measurement for a combined navigation constellation

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Chinese Journal of Aeronautics 2014年第5期27卷 1199-1210页

作者： Gao Youtao xu bo Zhang Lei College of Astronautics Nanjing University of Aeronautics and Astronautics College of Astronomy and Space Science Nanjing University

In order to expand the coverage area of satellite navigation systems, a combined navigation constellation which is formed by a global navigation constellation and a Lagrangian navigation constellation was studied. Only the crosslink range measurement was used to achieve long-term precise autonomous orbit determination for the combined navigation constellation, and the measurement model was derived. Simulations of 180 days based on the international global navigation satellite system（GNSS） service（IGS） ephemeris showed that the mentioned autonomous orbit determination method worked well in the Earth–Moon system. Statistical results were used to analyze the accuracy of autonomous orbit determination under the influences of different Lagrangian satellite constellations.

关键词： Autonomous navigation Crosslink range Lagrange point Navigation constellation Orbit determination

A Photocaged Azidosugar for Light-Controlled Metabolic Labeling of Cell-Surface Sialoglycans

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Chinese Journal of Chemistry 2022年第7期40卷 806-812页

作者： bo cheng Yi Wan Qi Tang Yifei Du Feiyang xu Zhimin Huang Wei Qin Xing Chen College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China Beijing National Laboratory for Molecular Sciences Peking UniversityBeijing 100871China Peking-Tsinghua Center for Life Sciences Peking UniversityBeijing 100871China Synthetic and Functional Biomolecules Center Peking University Beijing 100871China Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education Peking UniversityBeijing 100871China

The photocaging strategy has been widely used for activating biomolecules and hence regulating the underlying biological processes with high temporal and spatial ***,we integrate this strategy into metabolic glycan labeling,which enables optical-ly-controlled metabolic labeling of cell-surface sialoglycans with azides.N-Azidoacetylmannosamine(ManNAz)is caged with a 4,5-dimethoxy-2-nitrobenzyl(DMNB)group at the anomeric hydroxyl group to block its cellular *** feeding to the cells,irradiation with 365 nm UV light or 405 nm visible light cleaves the photocage and generates ManNAz within the *** is metabolically converted to azido sialic acid,which is then incorporated into cell-surface *** demonstrated spatial and temporal control of this strategy by specifically labeling sialoglycans on a single cell and tracking the metabolism of ManNAz based on light-triggered pulse-chase labeling,*** light-controlled metabolic glycan labeling strategy should facilitate probing of glycosylation in complex biological systems with high spatiotemporal precision.

关键词： Sialic acids Caged compounds Click chemistry Pulse-chase Single cell

Prognostic value of a nomogram model for postoperative liver metastasis of colon cancer

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World Journal of Gastrointestinal Surgery 2024年第4期16卷 1055-1065页

作者： De-Xin cheng Kang-Di xu Han-bo Liu Yi Liu Department of Interventional Medicine Zhejiang Provincial People’s Hospital(Affiliated People’s HospitalHangzhou Medical College)Hangzhou 310014Zhejiang ProvinceChina General Surgery Cancer CenterDepartment of Vascular SurgeryZhejiang Provincial People’s Hospital(Affiliated People’s HospitalHangzhou Medical College)Hangzhou 310014Zhejiang ProvinceChina

BACKGROUND Colon cancer is one of the most common malignant tumors of the digestive *** metastasis after colon cancer surgery is the primary cause of death in patients with colon *** To construct a novel nomogram model including various factors to predict liver metastasis after colon cancer *** We retrospectively analyzed 242 patients with colon cancer who were admitted and underwent radical resection for colon cancer in Zhejiang Provincial People’s Hospital from December 2019 to December *** were divided into liver metastasis and non-liver metastasis ***,age,and other general and clinicopathological data(preoperative blood routine and biochemical test indexes)were *** risk factors for liver metastasis were analyzed using singlefactor and multifactorial logistic regression.A predictive model was then constructed and evaluated for *** Systemic inflammatory index(SII),C-reactive protein/albumin ratio(CAR),red blood cell distribution width(RDW),alanine aminotransferase,preoperative carcinoembryonic antigen level,and lymphatic metastasis were different between groups(P<0.05).SII,CAR,and RDW were risk factors for liver metastasis after colon cancer surgery(P<0.05).The area under the curve was 0.93 for the column-line diagram prediction model constructed based on these risk factors to distinguish whether liver metastasis occurred *** actual curve of the column-line diagram predicting the risk of postoperative liver metastasis was close to the ideal curve,with good *** prediction model curves in the decision curve analysis showed higher net benefits for a larger threshold range than those in extreme cases,indicating that the model is *** Liver metastases after colorectal cancer surgery could be well predicted by a nomogram based on the SII,CAR,and RDW.

关键词： Systemic immunoinflammatory index C-reactive protein/albumin ratio Erythrocyte distribution width Colon cancer Liver metastasis Novel nomogram model

D2ANet:Difference-aware attention network for multi-level change detection from satellite imagery

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Computational Visual Media 2023年第3期9卷 563-579页

作者： Jie Mei Yi-bo Zheng Ming-Ming cheng TMCC CSNankai UniversityTianjin 300350China State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China

Recognizing dynamic variations on the ground,especially changes caused by various natural disasters,is critical for assessing the severity of the damage and directing the disaster ***,current workflows for disaster assessment usually require human analysts to observe and identify damaged buildings,which is labor-intensive and unsuitable for large-scale disaster *** this paper,we propose a difference-aware attention network(D2ANet)for simultaneous building localization and multi-level change detection from the dual-temporal satellite *** the differences in different channels in the features of pre-and post-disaster images,we develop a dual-temporal aggregation module using paired features to excite change-sensitive channels of the features and learn the global change *** the nature of building damage caused by disasters is diverse in complex environments,we design a difference-attention module to exploit local correlations among the multi-level changes,which improves the ability to identify damage on different *** experiments on the large-scale building damage assessment dataset xBD demonstrate that our approach provides new state-of-the-art *** code is publicly available at https://***/mj129/D2ANet.

关键词： change detection building localization sate-llite imagery dual-temporal aggregation difference attention

Entanglement and Teleportation of Pair Cat States in Amplitude Decoherence Channel

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Communications in Theoretical Physics 2009年第7期52卷 45-49页

作者： xu Hang-Shi xu Jing-bo Zhejiang Institute of Modern Physics and Physics Department Zhejiang University Hangzhou 310027 China

The dynamic behavior of the entanglement for the pair cat states in the amplitude decoherence channel isstudied by adopting the entanglement of formation determined by the ***,we consider the teleportationby using joint measurements of the photon-number sum and phase difference with the pair cat states as an entangleresource and discuss the influence of amplitude decoherence on the mean fidelity of the teleportation.

关键词： entanglement teleportation pair cat states

Total synthesis of norleucosceptroids F and G

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Chinese Chemical Letters 2015年第11期26卷 1341-1344页

作者： Jiao xu bo Liu Key Laboratory of Green Chemistry & Technology of Ministry of Education College of Chemistry Sichuan University State Key Laboratory of Natural Medicines China Pharmaceutical University

First total synthesis of norleucosceptroids F and G has been achieved through key steps of Michael-AIdol cascade, oxa-Michael cyclization-dehydration-deprotection cascade and cross metathesis （CM）, this work develop... 详细信息

关键词： Total synthesisNorleucosceptroid FNorleucosceptroid G

Indirect Electrochemical Oxidation of 4-Amino-dimethyl-aniline Hydrochloride

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Chemical Research in Chinese Universities 2006年第3期22卷 360-363页

作者： ZHANG Qiang KANG bo xu Hong LIN Hai-bo Department of Chemistry College of Science Beijing Institute of Technology Beefing 100081 P. R. China College of Chemistry Jilin University Changchun 130021 P. R. China

The indirect dectrechemical oxidation of 4-amino-dimethyl-aniline hydrochloride containing wastewater generated from vanillin production is presented. Experiments were conducted at a constant current density of 30 rnA/cm^2 via a Ti/Bu-Ti-Sn ternary oxide coated anode and an undivided reactor. During the various stages of the electrolysis, parameters such as the values of chemical oxygen demand（COD） and total organic carbon（TOC） were determined in order to evaluate the feasibility of the electrochemical treatment. The energy consumption and the current efficiency during the electrolysis were calculated. The present study proves the effectiveness of the electrochemical treatment for wastewater resulted from vanillin production.

关键词： Electrochemical oxidation 4-Amino-dimethyl-aniline Wastewater treatment Vanillin