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| 1 | Laparoscopic versus open right hemicolectomy with curative intent for colon carcinoma显示文摘AIM: Laparoscopic surgery, especially laparoscopic rectal surgery, for colorectal cancer has been developed considerably. However, due to relatively complicated anatomy and high requirements for surgery techniques,laparoscopic right colectomy develops relatively slowly. This study was designed to compare the outcomes of laparoscopic right hemicolectomy (LRH) with open right hemicolectomy (ORH) in the treatment of colon carcinoma.METHODS: Between September 2000 and February 2003,30 patients with colon cancer who underwent LRH were compared with 34 controls treated by ORH in the same period. All patients were evaluated with respect to surgeryrelated complications, postoperative recovery, recurrence and metastasis rate, cost-effectiveness and survival.RESULTS: Among 30 LRH, 2 (6.7%) were converted to open procedure. No significant differences were observed in terms of mean operation time, blood loss, post-operative complications, and hospital cost between LRH and ORH groups. Mean time for bowel movement, hospital stay,and time to resume early activity in the LRH group were significantly shorter than those in the ORH group (2.24±0.56vs 3.25±1.29 d, 13.94±6.5 vs 18.25±5.96 d, 3.94±1.64 vs 5.45±1.82 d respectively, P<0.05). As to the lymph node yield, the specimen length and total cost for operation and drugs, there was no significant difference between the two groups. Local recurrence rate and metachronous metastasis rate had no marked difference between the two groups.Cumulative survival probability at 40 mo in LRH group (76.50%) was not obviously different compared to the ORH group (74.04%).CONCLUSION: LRH in patients with colon cancer has statistically and clinically significant advantages over ORH.Thus, LRH can be regarded as a safe and effective procedure. | Min-HuaZheng BoFeng Ai-GuoLu Jian-WenLi Ming-LiangWang Zhi-HaiMao Yan-YanHu FengDong Wei-GuoHu Dong-HuaLi LuZang Yuan-FeiPeng Bao-MingYu | 2005 | World Journal of Gastroenterology2005，11，3： | 34 |
| 2 | Large-scale wind turbine blade design and aerodynamic analysis显示文摘Incorporating controlled elitism and dynamic distance crowding strategies, a modified NSGA-II algorithm based on a fast and genetic non-dominated sorting algorithm is developed with the aim of obtaining a novel multi-objective optimization design algorithm for wind turbine blades. As an example, a high-performance 1.5 MW wind turbine blade, taking maximum annual energy production and minimum blade mass as the optimization objectives, was designed. A 1/16-scale model of this blade was tested in a 12 m × 16 m wind tunnel and the experimental results validated the high performance. Moreover, both the computational fluid dynamics (CFD) method and a free-vortex method (FVM) were applied to calculating the aerodynamic performance, which was consistent with the experimental data. For completeness, the CFD and FVM were used to analyze the wake structure, and good and consistent results were obtained between them. | WANG TongGuang WANG Long ZHONG Wei XU BoFeng CHEN Li | 2012 | Chinese Science Bulletin2012，57，5： | 23 |
| 3 | Assessment of stochastic models for GPS measurements with different types of receivers显示文摘The stochastic model plays an important role in parameter estimation. The optimal estimator in the sense of least squares can only be obtained by using the correct stochastic model and consequently guarantees the precise positioning in GPS applications. In this contribution, the GPS measurements, collected by different types of geodetic dual-frequency receiver pairs on ultra-short baselines with a sampling interval of 1 s, are used to address their stochastic models, which include the variances of all observation types, the relationship between the observation accuracy and its elevation angle, the time correlation, as well as the correlation between observation types. The results show that the commonly used stochastic model with the assumption that all the raw GPS measurements are independent with the same variance does not meet the need for precise positioning and the elevation-dependent weight model cannot work well for different receiver and observation types. The time correlation and cross correlation are significant as well. It is therefore concluded that the stochastic model is much associated with the receiver and observation types and should be specified for the receiver and observation types. | LI BoFeng SHEN YunZhong XU PeiLiang | 2008 | Chinese Science Bulletin2008，53，20： | 21 |
| 4 | The seamless model for three-dimensional datum transformation显示文摘With extensive applications of space geodesy, three-dimensional datum transformation model has been necessarily used to transform the coordinates in the different coordinate systems.Its essence is to predict the coordinates of non-common points in the second coordinate system based on their coordinates in the first coordinate system and the coordinates of common points in two coordinate systems.Traditionally, the computation of seven transformation parameters and the transformation of noncommon points are individually implemented, in which the errors of coordinates are taken into account only in the second system although the coordinates in both two systems are inevitably contaminated by the random errors.Moreover, the coordinate errors of non-common points are disregarded when they are transformed using the solved transformation parameters.Here we propose the seamless (rigorous) datum transformation model to compute the transformation parameters and transform the non-common points integratively, considering the errors of all coordinates in both coordinate systems.As a result, a nonlinear coordinate transformation model is formulated.Based on the Gauss-Newton algorithm and the numerical characteristics of transformation parameters, two linear versions of the established nonlinear model are individually derived.Then the least-squares collocation (prediction) method is employed to trivially solve these linear models.Finally, the simulation experiment is carried out to demonstrate the performance and benefits of the presented method.The results show that the presented method can significantly improve the precision of the coordinate transformation, especially when the non-common points are strongly correlated with the common points used to compute the transformation parameters. | LI BoFeng SHEN YunZhong LI WeiXiao | 2012 | Science China Earth Sciences2012，55，12： | 19 |
| 5 | Spatial-temporal changes of Tianjin urban spatial morphology from 1978 to 2004显示文摘拿的分数维的尺寸,紧缩的比率,城市的矩心;城市的轴当城市的空间特征索引,天津城市的城市的区域在一个量的观点在最后 26 年里被调查,;它的特点;变化也在不同时期期间被分析。这些索引,是清楚的不能仅仅科学地;明确地估计城市形态,城市的方向;它的变化;趋势,而且揭开经济的长期的效果;在城市形态上的城市的计划。 | CAI Bofeng ZHANG Zengxiang LIU Bin ZHOU Quanbin | 2007 | Journal of Geographical Sciences2007，17，4： | 14 |
| 6 | Carbon dioxide emissions from cities in China based on high resolution emission gridded data显示文摘Based on the China high resolution emission gridded data(1 km spatial resolution), this article is aimed to create a Chinese city carbon dioxide(CO_2) emission data set using consolidated data sources as well as normalized and standardized data processing methods. Standard methods were used to calculate city CO_2 emissions, including scope 1 and scope 2. Cities with higher CO_2 emissions are mostly in north, northeast, and eastern coastal areas. Cities with lower CO_2 emissions are in the western region. Cites with higher CO_2 emissions are clustered in the Jing-Jin-Ji Region(such as Beijing, Tianjin, and Tangshan), and the Yangtze River Delta region(such as Shanghai and Suzhou).The city per capita CO_2 emission is larger in the north than the south. There are obvious aggregations of cities with high per capita CO_2 emission in the north. Four cities among the top 10 per capita emissions(Erdos, Wuhai, Shizuishan, and Yinchuan) cluster in the main coal production areas of northern China. This indicates the significant impact of coal resources endowment on city industry and CO_2 emissions. The majority(77%) of cities have annual CO_2 emissions below 50 million tons. The mean annual emission, among all cities, is 37 million tons. Emissions from service-based cities, which include the smallest number of cities, are the highest. Industrial cities are the largest category and the emission distribution from these cities is close to the normal distribution. Emissions and degree of dispersion, in the other cities(excluding industrial cities and service-based cities), are in the lowest level. Per capita C02 emissions in these cities are generally below 20 t/person(89%) with a mean value of 11 t/person. The distribution interval of per capita CO_2 emission within industrial cities is the largest among the three city categories. This indicates greater differences among per capita CO_2 emissions of industrial cities. The distribution interval of per capita CO_2 emission of other cities is the lowest, indicating smaller differences of per capita CO_2 emissions among this city category. Three policy suggestions are proposed: first, city CO_2 emission inventory data in China should be increased,especially for prefecture level cities. Second, city responsibility for emission reduction, and partitioning the national goal should be established, using a bottom-up approach based on specific CO_2emission levels and potential for emission reductions in each city. Third, comparative and benchmarking research on city CO_2 emissions should be conducted, and a Top Runner system of city CO_2emission reduction should be established. | Bofeng Cai Jinnan Wang Shuying Yang Xianqiang Mao Libin Cao | 2017 | Chinese Journal of Population,Resources and Environment2017，15，1： | 10 |
| 7 | Recent advances in nanoporous graphene membrane for gas separation and water purification显示文摘Graphene is a one-atom-thick sheet of graphite comprising sp2-hybridized carbon atoms arranged in the hexagonal honeycomb lattices. By removing the honeycomb lattices and forming nanopores with specific geometry and size, nanoporous graphene has been demonstrated as a very high-efficiency separation membrane, due to the ultrafast molecular permeation rate for its one-atom thickness. This review focuses on the recent advances in nanoporous graphene membrane for the applications of gas separation and water purification, with a major emphasis on the molecular permeation mechanisms and the advanced fabrication methods of this state-of-the-art membrane. We highlight the advanced theoretical and experimental works and discuss the gas/water molecular transport mechanisms through the graphene nanopores accompanied with theoretical models. In addition, we summarize some representative membrane fabrication methods, covering the graphene transfer to porous substrates and the pore generation. We anticipate that this review can provide a platform for understanding the current challenges to make the conceptual membrane a reality and attracting more and more attentions from scientists and engineers. | Chengzhen Sun Boyao Wen Bofeng Bai | 2015 | Science Bulletin2015，60，21： | 8 |
| 8 | Angiogenesis in a 3D model containing adipose tissue stem cells and endothelial cells is mediated by canonical Wnt signaling显示文摘Adipose-derived stromal cells(ASCs) have gained great attention in regenerative medicine. Progress in our understanding of adult neovascularization further suggests the potential of ASCs in promoting vascular regeneration, although the specific cues that stimulate their angiogenic behavior remain controversial. In this study, we established a three-dimensional(3D) angiogenesis model by co-culturing ASCs and endothelial cells(ECs) in collagen gel and found that ASC-EC-instructed angiogenesis was regulated by the canonical Wnt pathway. Furthermore, the angiogenesis that occurred in implants collected after injections of our collagen gelbased 3D angiogenesis model into nude mice was confirmed to be functional and also regulated by the canonical Wnt pathway. Wnt regulation of angiogenesis involving changes in vessel length, vessel density,vessel sprout, and connection numbers occurred in our system. Wnt signaling was then shown to regulate ASCmediated paracrine signaling during angiogenesis through the nuclear translocation of β-catenin after its cytoplasmic accumulation in both ASCs and ECs. This translocation enhanced the expression of nuclear cofactor Lef-1 and cyclin D1 and activated the angiogenic transcription of vascular endothelial growth factor A(VEGFA), basic fibroblast growth factor(bF GF), and insulin-like growth factor 1(IGF-1). The angiogenesis process in the 3D collagen model appeared to follow canonical Wnt signaling, and this model can help us understand the importance of the canonical Wnt pathway in the use of ASCs in vascular regeneration. | Xiaoxiao Cai Jing Xie Yang Yao Xiangzhu Cun Shiyu Lin Taoran Tian Bofeng Zhu Yunfeng Lin | 2017 | Bone Research2017，5，4： | 6 |
| 9 | Molecular sieving through a graphene nanopore: non-equilibrium molecular dynamics simulation显示文摘Two-dimensional graphene nanopores have shown great promise as ultra-permeable molecular sieves based on their size-sieving effects. We design a nitrogen/hydrogen modified graphene nanopore and conduct a transient non-equilibrium molecular dynamics simulation on its molecular sieving effects. The distinct time-varying molecular crossing numbers show that this special nanopore can efficiently sieve CO_2 and H_2S molecules from CH_4 molecules with high selectivity. By analyzing the molecular structure and pore functionalization-related molecular orientation and permeable zone in the nanopore, density distribution in the molecular adsorption layer on the graphene surface, as well as other features, the molecular sieving mechanisms of graphene nanopores are revealed. Finally, several implications on the design of highly-efficient graphene nanopores, especially for determining the porosity and chemical functionalization, as gas separation membranes are summarized based on the identified phenomena and mechanisms. | Chengzhen Sun Bofeng Bai | 2017 | Science Bulletin2017，62，8： | 5 |
| 10 | Adaptive Linearized Alternating Direction Method of Multipliers for Non-Convex Compositely Regularized Optimization Problems显示文摘We consider a wide range of non-convex regularized minimization problems, where the non-convex regularization term is composite with a linear function engaged in sparse learning. Recent theoretical investigations have demonstrated their superiority over their convex counterparts. The computational challenge lies in the fact that the proximal mapping associated with non-convex regularization is not easily obtained due to the imposed linear composition. Fortunately, the problem structure allows one to introduce an auxiliary variable and reformulate it as an optimization problem with linear constraints, which can be solved using the Linearized Alternating Direction Method of Multipliers(LADMM). Despite the success of LADMM in practice, it remains unknown whether LADMM is convergent in solving such non-convex compositely regularized optimizations. In this research, we first present a detailed convergence analysis of the LADMM algorithm for solving a non-convex compositely regularized optimization problem with a large class of non-convex penalties. Furthermore, we propose an Adaptive LADMM(Ada LADMM) algorithm with a line-search criterion. Experimental results on different genres of datasets validate the efficacy of the proposed algorithm. | Linbo Qiao Bofeng Zhang Xicheng Lu Jinshu Su | 2017 | Tsinghua Science and Technology2017，22，3： | 5 |
| 11 | Urinary nucleosides as biological markers for patients with colorectal cancer显示文摘AIM: Fourteen urinary nucleosides, primary degradation products of tRNA, were evaluated to know the potential as biological markers for patients with colorectal cancer.METHODS: The concentrations of 14 kinds of urinary nucleosides from 52 patients with colorectal cancer, 10patients with intestinal villous adenoma and 60 healthy adults were determined by column switching high performance liquid chromatography method.RESULTS: The mean levels of 12 kinds of urinary nucleosides (except uridine and guanosine) in the patients with colorectal cancer were significantly higher than those in patients with intestinal villous adenoma or the healthy adults. Using the levels of 14 kinds of urinary nucleosides as the data vectors for principal component analysis, 71% (37/52) patients with colorectal cancer were correctly classified from healthy adults, in which the identification rate was much higher than that of CEA method (29%).Only 10% (1/10) of patients with intestinal villous adenoma were indistinguishable from patients with colorectal cancer. The levels of m1G, Pseu and m1A were positively related with tumor size and Duke's stages of colorectal cancer. When monitoring the changes in urinary nucleoside concentrations of patients with colorectal cancer associated with surgery, it was found that the overall correlations with clinical assessment were 84% (27/32)and 91% (10/11) in response group and progressive group, respectively.CONCLUSION: These findings indicate that urinary nucleosides determined by column switching high performance liquid chromatography method may be useful as biological markers for colorectal cancer. | Yu-FangZheng JunYang Xin-JieZhao BoFeng Hong-WeiKong Ying-JieChen ShenLv Min-HuaZheng Guo-WangXu | 2005 | World Journal of Gastroenterology2005，11，25： | 5 |
| 12 | “Three essential elements”of the primary health care system:A comparison between California in the US and Guangdong in China显示文摘The primary health care system(PHCS)is the portal and basis for the national health delivery system.There are a number of elements which comprise the PHCS,but the system cannot be established and developed without the support of“three essential elements,”including general practitioners(GPs),health insurance,and government health investment.Through comparative analysis of the“three essential elements”of the PHCS between California in the US and Guangdong in China,this article indicates that there are three important aspects in developing a PHCS in China,as follows:training qualified GPs;establishing a diversified health insurance system to strengthen the policy connections between health insurance and the PHCS thereby increasing government health investment;and broadening health financing channels. | Minfang Huang Donghai Wei Louis Rubino Lianshen Wang Dazhuang Li Bofeng Ding Gan Li | 2015 | Family Medicine and Community Health2015，3，1： | 5 |
| 13 | Improved precise positioning with BDS-3 quad-frequency signals显示文摘The establishment of the BeiDou global navigation satellite system(BDS-3)has been completed,and the current constellation can independently provide positioning service globally.BDS-3 satellites provide quad-frequency signals,which can benefit the ambiguity resolution(AR)and high-precision positioning.This paper discusses the benefits of quad-frequency observations,including the precision gain of multi-frequency high-precision positioning and the sophisticated choice of extra-wide-lane(EWL)or wide-lane(WL)combinations for instantaneous EWL/WL AR.Additionally,the performance of EWL real-time kinematic(ERTK)positioning that only uses EWL/WL combinations is investigated.The results indicate that the horizontal positioning errors of ERTK positioning using ionosphere-free(IF)EWL observations are approximately 0.5 m for the baseline of 27 km and 1 m for the baseline of 300 km.Furthermore,the positioning errors are reduced to the centimetre level if the IF EWL observations are smoothed by narrow-lane observations for a short period. | Bofeng Li Zhiteng Zhang Weikai Miao Guang’e Chen | 2020 | Satellite Navigation2020，1，1： | 4 |
| 14 | LEO Enhanced Global Navigation Satellite System(LeGNSS):progress,opportunities,and challenges显示文摘With the completion of Chinese BeiDou Navigation Satellite System(BDS),the world has begun to enjoy the Positioning,Navigation,and Timing(PNT)services of four Global Navigation Satellite Systems(GNSS).In order to improve the GNSS performance and expand its applications,Low Earth Orbit(LEO)Enhanced Global Navigation Satellite System(LeGNSS)is being vigorously advocated.Combined with high-,medium-,and low-earth orbit satellites,it can improve GNSS performance in terms of orbit determination,Precise Point Positioning(PPP)convergence time,etc.This paper comprehensively reviews the current status of LeGNSS,focusing on analyzing its advantages and challenges for precise orbit and clock determination,PPP convergence,earth rotation parameter estimation,and global ionosphere modeling.Thanks to the fast geometric change brought by LEO satellites,LeGNSS is expected to fundamentally solve the problem of the long convergence time of PPP without any augmentation.The convergence time can be shortened within 1 minute if appropriate LEO constellations are deployed.However,there are still some issues to overcome,such as the optimization of LEO constellation as well as the real time LEO precise orbit and clock determination. | Haibo Ge Bofeng Li Song Jia Liangwei Nie Tianhao Wu Zhe Yang Jingzhe Shang Yanning Zheng Maorong Ge | 2022 | Geo-Spatial Information Science2022，25，1： | 4 |
| 15 | Several Kinematic Data Processing Methods for Time-Correlated Observations显示文摘Time correlations always exist in modern geodetic data,and ignoring these time correlations will affect the precision and reliability of solutions.In this paper,several methods for processing kinematic time-correlated observations are studied.Firstly,the method for processing the time-correlated observations is expanded and unified.Based on the theory of maximum a posteriori estimation,the third idea is proposed after the decorrelation transformation and differential transformation.Two types of situations with and without common parameters are both investigated by using the decorrelation transformation,differential transformation and maximum a posteriori estimation solutions.Besides,the characteristics and equivalence of above three methods are studied.Secondly,in order to balance the computational efficiency in real applications and meantime effectively capture the time correlations,the corresponding reduced forms based on the autocorrelation function are deduced.Finally,with GPS real data,the correctness and practicability of derived formulae are evaluated. | Bofeng LI Zhetao ZHANG | 2019 | Journal of Geodesy and Geoinformation Science2019，2，4： | 4 |
| 16 | Comparison and analysis of unmodelled errors in GPS and BeiDou signals显示文摘In Global Navigation Satellite Systems(GNSS) positioning,one often tries to establish a mathematic model to capture the systematic behaviors of observations as much as possible.However,the observation residuals still exhibit,to a great extent,as(somewhat systematic) signals.Nevertheless,those systematic variations are referred to as the unmodelled errors,which are difficult to be further modelled by setting up additional parameters.Different from the random errors,the unmodelled errors are colored and time correlated.In general,the larger the time correlations are,the more significant the unmodelled errors.Hence,understanding the time correlations of unmodelled errors is important to develop the theory for processing the unmodelled errors.In this study,we compare and analyze the time correlations caused by unmodelled errors of Global Positioning System(GPS) and BeiDou signals.The time correlations are estimated based on the residuals of double differenced observations on 11 baselines with different lengths.The results show that the time correlation patterns are different significantly between GPS and BeiDou observations.Besides,the code and phase data from the same satellite system are also not the same.Furthermore,the unmodelled errors are affected by not only the baseline length,but also some other factors.In addition,to make use of the time correlations with more efficiency,we propose to fit the time correlations by using exponent and quadratic models and the fitting coefficients are given.Finally,the sequential adjustment method considering the time correlations is implemented to compute the baseline solutions.The results show that the solutions considering the time correlations can objectively reflect the actual precisions of parameter estimates. | Zhetao Zhang Bofeng Li Yunzhong Shen | 2017 | Geodesy and Geodynamics2017，8，1： | 3 |
| 17 | Generation and characterization of stable pig pregastrulation epiblast stem cell lines显示文摘Pig epiblast-derived pluripotent stem cells are considered to have great potential and broad prospects for human therapeutic model developme nt and livestock breeding.Despite on going attempts since the 1990s,no stably defined pig epiblast-derived stem cell line has bee n established.Here,guided by in sights from a large-scale sin gle-cell tran scriptome an alysis of pig embryos from embryonic day(E)0 to E14,specifically,the tracing of pluripotency changes during epiblast development,we developed an in vitro culture medium for establishing and maintaining stable pluripotent stem cell lines from pig E10 pregastrulation epiblasts(pgEpiSCs).Enabled by chemical inhibition of WNT-related signaling in combination with growth factors in the FGF/ERK,JAK/STAT3,and Activin/Nodal pathways,pgEpiSCs maintain their pluripotency transcriptome features,similar to those of E10 epiblast cells,and normal karyotypes after more than 240 passages and have the potential to differentiate into three germ layers.Strikingly,ultradeep in situ Hi-C analysis revealed functional impacts of chromatin 3D-spatial associations on the transcriptional regulation of pluripote ncy marker genes in pgEpiSCs.I n practice,we con firmed that pgEpiSCs readily tolerate at least three rounds of successive gene editi ng and gene rated cloned gen e-edited live piglets.Our findings deliver on the long-a nticipated promise of pig pluripote nt stem cells and open new avenues for biological research,animal husbandry,and regenerative biomedicine. | Minglei Zhi Jinying Zhang Qianzi Tang Dawei Yu Shuai Gao Dengfeng Gao Pengliang Liu Jianxiong Guo Tang Hai Jie Gao Suying Cao Zimo Zhao Chongyang Li Xiaogang Weng Mengnan He Tianzhi Chen Yingjie Wang Keren Long Deling Jiao Guanglei Li Jiaman Zhang Yan Liu Yu Lin Daxin Pang Qianqian Zhu Naixin Chen Jingjing Huang Xinze Chen Yixuan Yao Jingcang Yang Zicong Xie Xianya Huang Mengxin Liu Ran Zhang Qiuyan Li Yiliang Miao Jianhui Tian Xingxu Huang Hongsheng Ouyang Bofeng Liu Wei Xie Qi Zhou Zhonghua Liu Caihong Zheng Mingzhou Li Jianyong Han | 2022 | Cell Research2022，32，4： | 3 |
| 18 | Decomposition Analysis of Sectoral Energy Use in Beijing (1981-2005) Using the LMDI Method显示文摘This paper aims to identify the main driving force for changes of total primary energy consumption in Beijing during the period of 1981-2005.Sectoral energy use was investigated when regional economic structure changed significantly.The changes of total primary energy consumption in Beijing are decomposed into production effects,structural effects and intensity effects using the additive version of the logarithmic mean Divisia index (LMDI) method.Aggregate decomposition analysis showed that the major contributor of total effect was made by the production effect fol- lowed by the intensity effect,and the structural effect was rela- tively insignificant.The total and production effects were all posi- tive.In contrast,the structural effect and intensity effect were all negative.Sectoral decomposition investigation indicated that the most effective way to slow down the growth rate of total primary energy consumption (TPEC) was to reduce the production of the energy-intensive industrial sectors and improving industrial en- ergy intensity.The results show that in this period,Beijing's economy has undergone a transformation from an industrial to a service economy.However,the structures of sectoral energy use have not been changed yet,and energy demand should be in- creasing until the energy-intensive industrial production to be reduced and energy intensity of the region reaches a peak.As sequence energy consumption data of sub-sectors are not available, only the fundamental three sectors are considered:agriculture, industry and service.However,further decomposition into secon- dary and tertiary sectors is definitely needed for detailed investi- gations. | Liu Chunlan Xie Gaodi Cai Bofeng | 2008 | Chinese Journal of Population,Resources and Environment2008，6，2： | 3 |
| 19 | Electro-optic lithium niobate metasurfaces显示文摘Many applications of metasurfaces require an ability to dynamically change their properties in the time domain. Electrical tuning techniques are of particular interest, since they pave a way to on-chip integration of metasurfaces with optoelectronic devices.In this work, we propose and experimentally demonstrate an electro-optic lithium niobate(EO-LN) metasurface that shows dynamic modulations to phase retardation of transmitted light. Quasi-bound states in the continuum(QBIC) are observed from this metasurface. By applying external electric voltages, the refractive index of lithium niobate(LN) is changed by Pockels EO nonlinearity, leading to efficient phase modulations to the transmitted light around the QBIC wavelength. The EO-LN metasurface developed in this study opens up new routes for potential applications in the field of displaying, pulse shaping, and spatial light modulating. | BoFeng Gao MengXin Ren Wei Wu Wei Cai JingJun Xu | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，4： | 3 |
| 20 | Online recognition of the multiphase flow regime显示文摘The key reasons that the present method cannot be used to solve the industrial multi- phase flow pattern recognition are clarified firstly. The prerequisite to realize the online recognition is proposed and recognition rules for partial flow pattern are obtained based on the massive experimental data. The standard templates for every flow regime feature are calculated with self-organization cluster algorithm. The multi-sensor data fusion method is proposed to realize the online recognition of multiphase flow regime with the pressure and differential pressure signals, which overcomes the severe influence of fluid flow velocity and the oil fraction on the recognition. The online recognition method is tested in the practice, which has less than 10 percent measurement error. The method takes advantages of high confidence, good fault tolerance and less requirement of single sensor performance. | BAI BoFeng ZHANG ShaoJun ZHAO Liang ZHANG XiMin GUO LieJin | 2008 | Science China(Technological Sciences)2008，51，8： | 2 |
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