|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | BMP-IHH-mediated interplay between mesenchymal stem cells and osteoclasts supports calvarial bone homeostasis and repair显示文摘Calvarial bones are connected by fibrous sutures. These sutures provide a niche environment that includes mesenchymal stem cells(MSCs), osteoblasts, and osteoclasts, which help maintain calvarial bone homeostasis and repair. Abnormal function of osteogenic cells or diminished MSCs within the cranial suture can lead to skull defects, such as craniosynostosis. Despite the important function of each of these cell types within the cranial suture, we have limited knowledge about the role that crosstalk between them may play in regulating calvarial bone homeostasis and injury repair. Here we show that suture MSCs give rise to osteoprogenitors that show active bone morphogenetic protein(BMP) signalling and depend on BMP-mediated Indian hedgehog(IHH) signalling to balance osteogenesis and osteoclastogenesis activity. IHH signalling and receptor activator of nuclear factor kappa-Β ligand(RANKL) may function synergistically to promote the differentiation and resorption activity of osteoclasts. Loss of Bmpr1a in MSCs leads to downregulation of hedgehog(Hh) signalling and diminished cranial sutures. Significantly, activation of Hh signalling partially restores suture morphology in Bmpr1a mutant mice, suggesting the functional importance of BMP-mediated Hh signalling in regulating suture tissue homeostasis. Furthermore, there is an increased number of CD200+ cells in Bmpr1a mutant mice, which may also contribute to the inhibited osteoclast activity in the sutures of mutant mice. Finally, suture MSCs require BMPmediated Hh signalling during the repair of calvarial bone defects after injury. Collectively, our studies reveal the molecular and cellular mechanisms governing cell–cell interactions within the cranial suture that regulate calvarial bone homeostasis and repair. | Yuxing Guo Yuan Yuan Ling Wu Thach-Vu Ho Junjun Jing Hideki Sugii Jingyuan Li Xia Han Jifan Feng Chuanbin Guo Yang Chai | 2018 | Bone Research2018，6，4： | 12 |
| 2 | Advancement and prospect of short-term numerical climate prediction显示文摘The defects of present methods of short-term numerical climate prediction are discussed in this paper, and four challenging problems are put forward. Considering our under developed computer conditions, we should innovate in the approcuch of numerical climate prediction on the basis of our own achievements and experiences in the field of short-term numerical climate prediction. It is possibly an effective way to settle the present defects of short-term numerical climate prediction. | CHOU Jifan & XU Ming1. Department of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China 2. Training Center of Chinese Meteorological Administration, Beijing 100081, China | 2001 | Chinese Science Bulletin2001，46，18： | 11 |
| 3 | Forecast scheme and strategy for extended-range predictable components显示文摘Although extended-range forecasting has exceeded the limit of daily predictability of weather,there are still partially predictable characteristics of meteorological fields in such forecasts.A targeted forecast scheme and strategy for extended-range predictable components is proposed.Based on chaotic characteristics of the atmosphere,predictable components and unpredictable random components are separated by using the standpoint of error growth in a numerical model.The predictable components are defined as those with slow error growth at a given range,which are not sensitive to small errors in initial conditions. A numerical model for predictable components(NMPC)is established,by filtering random components with poor predictability.The aim is to maintain predictable components and avoid the influence of rapidly growing forecast errors on small scales. Meanwhile,the analogue-dynamical approach(ADA)is used to correct forecast errors of predictable components,to decrease model error and statistically take into account the influence of random components.The scheme is applied to operational dynamical extended-range forecast(DERF)model of the National Climate Center of China Meteorological Administration (NCC/CMA).Prediction results show that the scheme can improve forecast skill of predictable components to some extent, especially in high predictability regions.Forecast skill at zonal wave zero is improved more than for ultra-long waves and synoptic-scale waves.Results show good agreement with predictability of spatial scale.As a result,the scheme can reduce forecast errors and improve forecast skill,which favors operational use. | ZHENG ZhiHai HUANG JianPing FENG GuoLin CHOU JiFan | 2013 | Science China Earth Sciences2013，56，5： | 9 |
| 4 | Dynamic-statistics combined forecast scheme based on the abrupt decadal change component of summer precipitation in East Asia显示文摘基于 19832011 CMAP 数据,在东亚的降水异例和它的附近的海区域(此后叫的东亚为短) 在 1999 前表明 ++ 模式并且 + 模式以后;这个十的变化在相应 EOF3 部件主要被包含。然而, NCC_CGCM 预报结果是相当不同的,它在 1999 前揭示 ++ 模式并且 ++ 模式以后。同时,基于这些关键 SST 区域改进 NCC_CGCMs 预报精确性的概率被讨论,并且动态统计的联合预报计划为增加在东亚在夏天降水包含的十的变化的信息被构造。独立样品预报结果显示这个预报计划罐头有效地修改十的变化信息在东亚在夏天降水包含了的 NCC_CGCMs (特别在 30 敢琠敨攠癮 的区域吗?? | GONG ZhiQiang ZHAO JunHu FENG GuoLin CHOU JiFan | 2015 | Science China Earth Sciences2015，58，3： | 7 |
| 5 | Forming proper ensemble forecast initial members with four-dimensional variational data assimilation method显示文摘A method has been presented to improve ensemble forecast by utilizing these initial members generated by four-dimensional variational data assimilation (4-D VDA), to conquer limitation of those initial members generated by Monte Carlo forecast (MCF) or lagged average forecast (LAF). This method possesses significant statistical characteristic of MCF, and by virtue of LAF that contains multi-time information and its initial members are harmonic with | Jiandong Gong Weijing Li Jifan Chou | 1999 | Chinese Science Bulletin1999，44，16： | 6 |
| 6 | Dynamical analysis on splitting of subtropical high-pressure zone——Geostrophic effect显示文摘Based on two simple dynamical models, the preliminary dynamical analysis of the splitting of subtropical high_pressure zone (SHPZ) without land_sea contrast and orographic effect is investigated. Results show that the splitting of SHPZ may be an intrinsic attribute of the earth rotation atmosphere. | Jianping Li Jifan Chou | 1998 | Chinese Science Bulletin1998，43，15： | 6 |
| 7 | Pyrolysis of scrap tyres pretreated by waste coal tar显示文摘For disposal of scrap tyres,there have been a lot of studies done by previous researchers,but it yet remains a longstanding challenge in practice.To find a solution for this problem,the feasibility of a proposed approach in a laboratory scale was tested.The pyrolysis of scrap tyres pretreated by waste coal tar(noted as 'as-pretreated' tyres)was performed in a batch reactor at atmospheric pressure.Waste coal tar was used to modify the scrap tyres to improve the pyrolysis efficiency of scrap tyres input and the quality of the product tar.The swelling behavior of scrap tyres soaked in waste coal tar at 10℃,effect of pyrolysis temperature on the product yields,and the synergies during pyrolysis of the as-pretreated tyres and co-pyrolysis of scrap tyres/waste coal tar mixture were all investigated in detail.The results observed found that by comparison of the calculated yields and the observed experimental yields for pyrolysis products,the synergy from co-pyrolysis of scrap tyres/waste coal tar mixture boosted the gas yield without increasing the tar yield.In contrast,the synergy during pyrolysis of the as-pretreated tyres could enhance the tar yield,but reduced the gas and char yields.According to the distillation range analyses of the tar,more light fractions were found in the tar from pyrolysis of the as-pretreated tyres,in which the gasoline fraction,diesel fraction and kerosene fraction were 38.4 wt%,46.8 wt%and 50.2 wt%,respectively.This work is expected to be helpful in further use of scrap tyres. | Shaobo Ouyang Daoling Xiong Yang Li Laixi Zou Jifan Chen | 2018 | Carbon Resources Conversion2018，1，3： | 6 |
| 8 | Large-scale low-frequency rainfall regimes and their transition modes in summertime over China显示文摘Seven large-scale low-frequency rainfall regimes (LFRRs) in summertime are identified for China in a 10-dimensional phase space by using a 40-year daily precipitation dataset. Corresponding to the local extrema of observed probability density in phase space, the LFRRs are characterized by the persistence and transitions that reflect the spread and jump features of low-frequency rainfall centers. The LFRRs are generally consistent with summer monsoon rainbelts on the intraseasonal timescale, and there exist the preferred transition relationships between the LFRRs. Four LFRRs’ transition modes (LFRRTMs), which are the dominant components of the interannual and intraseasonal variability of sum- mer rainfall in China, are further induced. Analyses of atmospheric circulation system show that the anomalies of the subtropical high over the western Pacific (SHWP) and blockings in mid-high latitudes, the low-latitude circulation anomalies, and the wavetrains over the East Asia-Pacific region (EAPWs), play crucial roles in the occurrence and transitions of the LFRRs. Moreover, the evolution of the SHWP and blockings, the distribution and movement of the EAPWs, and the intraseasonal variability of the East Asian-Pacific jet stream may be principal factors of the formations of the LFRRTMs. | REN Hongli ZHANG Peiqun CHOU Jifan LI Weijing GAO Li | 2006 | Chinese Science Bulletin2006，51，11： | 6 |
| 9 | Computational stability of the forced dissipative nonlinear atmospheric equations显示文摘A new concept of computational quasi-stability (CQS) is introduced to study the computational stability (CS) of the forced dissipative nonlinear (FDN) evolution equations. Based on the concept, the CQS criterion of difference scheme of FDN atmospheric equations is obtained. So it provides the theoretical basis for designing the computational stable difference scheme of FDN atmospheric equations. | LI Jianping and CHOU Jifan LASG , Institute of Atmospheric Physics , Chinese Academy of Sciences , Beijing 100080, China Department of Atmospheric Sciences , Lanzhou University , Lanzhou 730000, China Beijing Meteorological College, Beijing 100081, China | 1999 | Chinese Science Bulletin1999，44，10： | 5 |
| 10 | Dynamics-based data science in biology显示文摘Life science has long been a rich subject for research,and continues to develop at high speed.One of the major aims of life science is to study the mechanisms of various biological processes on the basis of biological big-data.Many statistics-based methods have been proposed to catch the essence by mining such data,including the popular category classification,variables regression,group clustering,statistical comparison,dimensionality reduction,and component analysis. | Jifan Shi Kazuyuki Aihara Luonan Chen | 2021 | National Science Review2021，8，5： | 4 |
| 11 | Extraordinary simultaneous enhancement of the coercivity and remanence of dual alloy HRE-free Nd-Fe-B sintered magnets by post-sinter annealing显示文摘Post-sinter annealing process plays an important role in the microstructures and magnetic properties of the Nd-Fe-B sintered magnets.In this paper,systematically investigated are the magnetic properties and microstructures of the as-sintered and post-sinter annealed Nd-Fe-B magnets with Pr-Fe-Ga boundary addition.Two choice consecutive annealing methods are adopted at high and low temperatures,namely the 1 st annealing at 880℃ for 2 h and then the 2^(nd) annealing at 440℃ for 3 h.It is exceptional to find out that both the remanence and coercivity are improved after 2^(nd) annealing process for this type of magnet.The coercivity is hugely increased from 10.09 kOe for the as-sintered sample to 17.19 kOe for the 2^(nd) annealed magnet,with a significant increment of 70.37%in coercivity.The extraordinary magnetic properties of B_(r)=14.44 kGs,H_(cj)=17.19 kOe and(BH)_(max)=51.08 MGOe are obtained for the designated Nd-Fe-B sintered magnets without heavy rare earth(HRE)elements manufactured by dual alloy method.The Curie temperature is monotonically decreased from 634 K to 602 K while the c-axis alignment degree is optimized after annealing.Microstructural observation and analysis indicate that the elemental distribution patterns are altered after the 2^(nd) annealing.The diffusion of the aggregate(Pr,Nd,Cu,Ga)-rich phase from triple junctions into the grain boundary regions is ascribed to the formation of thin and continuous grain boundary layer,which is critical to improve the microstructures and magnetic properties. | Qingfang Huang Qingzheng Jiang Jifan Hu Sajjad Ur Rehman Gang Fu Qichen Quan Jixiang Huang Deqin Xu Dakun Chen Zhenchen Zhong | 2022 | Journal of Materials Science & Technology2022，，11： | 3 |
| 12 | CO_2 sensing properties and mechanism of PrFeO_3 and NdFeO_3 thick film sensor显示文摘The CO_2 sensing of PrFeO_3 and NdFeO_3 sensors were investigated. Experimental results show that the resistances for PrFeO_3 and NdFeO_3 in CO_2 gas are larger than those in air and the responses for PrFeO_3and NdFeO_3 sensors increase with an increase in room-temperature relative humidity. When exposed to1000 ppm CO_2, the response of PrFeO_3 thick film based on nano-powders annealed at 700℃can reach8.44 at 160℃for the background of wet air with 58%of room-temperature relative humidity (RH),which is much larger than the corresponding value (3.03) in wet air with 25%RH. The sensing response S of NdFeO_3 thick-film sensor based on nano-powders annealed at 600℃to 3000 ppm CO_2 at the operating temperature 200℃can reach 2.36 for the background of wet air with 72%RH, which is larger than the corresponding value (1.83) in the air with 25%RH. Compared with other CO_2 sensing materials, the PrFeO_3 sensor has larger response at lower operating temperature for CO_2 gas and may be used as a new CO_2 sensing material. | Yanping Chen Dandan Wang Hongwei Qin Heng Zhang Zhongli Zhang Guangjun Zhou Chengyong Gao Jifan Hu | 2019 | Journal of Rare Earths2019，37，1： | 2 |
| 13 | An Online Model Correction Method Based on an Inverse Problem:Part I—Model Error Estimation by Iteration显示文摘Errors inevitably exist in numerical weather prediction(NWP) due to imperfect numeric and physical parameterizations.To eliminate these errors,by considering NWP as an inverse problem,an unknown term in the prediction equations can be estimated inversely by using the past data,which are presumed to represent the imperfection of the NWP model(model error,denoted as ME). In this first paper of a two-part series,an iteration method for obtaining the MEs in past intervals is presented,and the results from testing its convergence in idealized experiments are reported. Moreover,two batches of iteration tests were applied in the global forecast system of the Global and Regional Assimilation and Prediction System(GRAPES-GFS) for July–August 2009 and January–February 2010. The datasets associated with the initial conditions and sea surface temperature(SST) were both based on NCEP(National Centers for Environmental Prediction) FNL(final) data.The results showed that 6th h forecast errors were reduced to 10% of their original value after a 20-step iteration. Then,off-line forecast error corrections were estimated linearly based on the 2-month mean MEs and compared with forecast errors. The estimated error corrections agreed well with the forecast errors,but the linear growth rate of the estimation was steeper than the forecast error. The advantage of this iteration method is that the MEs can provide the foundation for online correction. A larger proportion of the forecast errors can be expected to be canceled out by properly introducing the model error correction into GRAPES-GFS. | XUE Haile SHEN Xueshun CHOU Jifan | 2015 | Advances in Atmospheric Sciences2015，32，10： | 2 |
| 14 | Energy landscape decomposition for cell differentiation with proliferation effect显示文摘Complex interactions between genes determine the development and differentiation of cells.We establish a landscape theory for cell differentiation with proliferation effect,in which the developmental process is modeled as a stochastic dynamical system with a birth-death term.We find that two different energy landscapes,denoted U and V,collectively contribute to the establishment of non-equilibrium steady differentiation.The potential U is known as the energy landscape leading to the steady distribution,whose metastable states stand for cell types,while V indicates the differentiation direction from pluripotent to differentiated cells.This interpretation of cell differentiation is different from the previous landscape theory without the proliferation effect.We propose feasible numerical methods and a mean-field approximation for constructing landscapes U and V.Successful applications to typical biological models demonstrate the energy landscape decomposition’s validity and reveal biological insights into the considered processes. | Jifan Shi Kazuyuki Aihara Tiejun Li Luonan Chen | 2022 | National Science Review2022，9，8： | 2 |
| 15 | Detecting direct associations in a network by information theoretic approaches显示文摘Detecting direct associations or inferring networks based on the observed data is an important issue in many fields, including biology, physics, engineering and social studies. In this work, we focus on the information theoretic approaches in the network reconstruction or the direct association detection, in particular,for biological networks. We not only review the traditional approaches or measurements on the associations among the observed variables, such as correlation coefficient, mutual information and conditional mutual information(CMI), but also summarize recently developed theories and methods. The new theoretic works include:information geometry to give a unified framework in detecting causality/association, the partial independence to alleviate the singularity of CMI, and multiscale analysis of CMI to avoid the underestimation issue of CMI.The new methods include part mutual information(PMI) and partial associations(PA), which improve the old measurements in avoiding both overestimation and underestimation. All those theories and methods make important contributions as major advances in the development of network inference. | Jifan Shi Juan Zhao Tiejun Li Luonan Chen | 2019 | Science China Mathematics2019，62，5： | 2 |
| 16 | A multi-step induced strategy to fabricate core-shell Pt-Ni alloy as symmetric electrocatalysts for overall water splitting显示文摘Devising an electrocatalyst with brilliant efficiency and satisfactory durability for hydrogen production is of considerable demand,especially for large-scale application.Herein,we adopt a multi-step consequential induced strategy to construct a bifunctional electrocatalyst for the overall water splitting.Graphene oxide(GO)was used as a carbon matrix and in situ oxygen source,which was supported by the octahedral PtNi alloy to form the PtxNiy-GO precursor.When calcinating in Ar atmosphere,the oxygen in GO induced the surface segregation of Ni from the PtNi octahedron to form a core-shell structure of Ptx@Niy.Then,the surface-enriched Ni continuously induced the reformation of C in reduced graphene oxide(rGO)to enhance the degree of graphitization.This multi-step induction formed a nanocatalyst Pt_(x)@Ni_(y)-rGO which has very high catalytic efficiency and stability.By optimizing the feeding ratio of PtNi(Pt:Ni=1:2),the electrolytic overall water splitting at 10 mA·cm^(-2) can be driven by an electrolytic voltage of as low as 1.485 V,and hydrogen evolution reaction(HER)only needs an overpotential of 37 mV in 1.0 M KOH aqueous solution.Additionally,the catalyst exhibited consistent existence form in both HER and oxygen evolution reaction(OER),which was verified by switching the anode and cathode of the cell in the electrolysis of water.This work provides a new idea for the synthesis and evaluation of the bifunctional catalysts for water splitting. | Wenjuan Xu Jinfa Chang Yinggang Cheng Hongqi Liu Jifan Li Yongjian Ai Zenan Hu Xinyue Zhang Yiming Wang Qionglin Liang Yang Yang Hongbin Sun | 2022 | Nano Research2022，15，2： | 1 |
| 17 | Giant magnetoimpedance effect in Ag/NiFe plated wire显示文摘 | Hu Jifan | 2004 | Materials Science and Engineering B2004，106，： | 1 |
| 18 | Volume expansion and Curie temperature enhancement in R3(Fe,M29 (M=Mo and V and their nitrides显示文摘 | Liangmo Mei Kaizheng Luan | 1998 | Journal of Alloys and Compounds1998，278，： | 1 |
| 19 | Giant magnetoimpedance and permeability change in La 2/3 Sr 1/3 MnO 3 manganite under low fields显示文摘 | Jifan Hu Hongwei Qin Yifei Wang Bo Li | 2010 | Journal of Magnetism and Magnetic Materials2010，，： | 1 |
| 20 | Extracting predictable components and forecasting techniques in extended-range numerical weather prediction显示文摘This paper refers to the CNOP-related algorithms and formulates the practical method and forecast techniques of extracting predictable components in a numerical model for predictable components on extended-range scales.Model variables are divided into predictable components and unpredictable chaotic components from the angle of model prediction error growth.The predictable components are defined as those with a slow error growth at a given range.A targeted numerical model for predictable components is established based on the operational dynamical extended-range forecast(DERF)model of the National Climate Center.At the same time,useful information in historical data are combined to find the fields for predictable components in the numerical model that are similar to those for the predictable components in historical data,reducing the variable dimensions in a similar judgment process and further correcting prediction errors of predictable components.Historical data is used to obtain the expected value and variance of the chaotic components through the ensemble forecast method.The numerical experiment results show that this method can effectively improve the forecast skill of the atmospheric circulation field in the 10–30 days extended-range numerical model and has good prospects for operational applications. | WANG QiGuang CHOU JiFan FENG GuoLin | 2014 | Science China Earth Sciences2014，57，7： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员