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| 1 | Singularity Analysis of a 3-RPS Parallel Manipulator Using Geometric Algebra显示文摘Singular configurations must be avoided in path planning and control of a parallel manipulator. However, most studies rarely focus on an overall singularity loci distribution of lower-mobility parallel mechanisms. Geometric algebra is employed in analysis of singularity of a 3-RPS parallel manipulator. Twist and wrench in screw theory are represented in geometric algebra. Linear dependency of twists and wrenches are described by outer product in geometric algebra. Reciprocity between twists and constraint wrenches are reflected by duality. To compute the positions of the three spherical joints of the 3-RPS parallel manipulator, Tilt-and-Torsion angles are used to describe the orientation of the moving platform. The outer product of twists and constraint wrenches is used as an index for closeness to singularity(ICS) of the 3-RPS parallel manipulator. An overall and thorough perspective of the singularity loci distribution of the 3-RPS parallel manipulator is disclosed, which is helpful to design, trajectory planning and control of this kind of parallel manipulator. | LI Qinchuan XIANG Ji'nan CHAI Xinxue WU Chuanyu | 2015 | Chinese Journal of Mechanical Engineering2015，28，6： | 12 |
| 2 | Danshen protects endothelial progenitor cells from oxidized low-density lipoprotein induced impairment显示文摘In this study,we examined the protective effects of Danshen both on endothelial progenitor cells(EPCs) in patients with hypercholesterolemia and on in-vitro EPCs of healthy volunteers.In the clinical study,we randomly divided 24 subjects with hypercholesterolemia into two groups(the control group and the Danshen-treated group).At the end of two weeks of treatment,the EPC cellular functions of both groups were tested.The results indicated that,compared to the control group,EPCs in the Danshen-treated group showed significantly better cellular functions,which was manifested in the cloning number,the proliferation capacity,the number of EPC adhesions,and cell migration.In the subsequent in-vitro experiments,EPCs were treated with vehicle,oxidized low-density lipoprotein(Ox-LDL,100 μg/ml),or Ox-LDL(100 μg/ml) plus different concentrations of Danshen(Danshensu 2,10,or 50 μg/ml,respectively) for 24 h.The results showed that Danshen treatments can prevent the detrimental effects of Ox-LDL on EPC cellular functions measured by proliferation capacity(0.24±0.08,0.37±0.11,0.30±0.04 vs.0.13±0.02,P<0.05,P<0.01,and P<0.01,respectively),and adhesion ability(63.00±11.60,70.00±10.80,85.50±11.41 vs.40.50±6.85,all P<0.01).Compared to the group treated with Ox-LDL alone,Danshen treatment significantly decreased the lipid peroxidation end product malondialdehyde(MDA) [(4.34±0.54),(3.98±0.47),(3.46±0.31) vs.(5.57±0.64) nmol/ml,all P<0.01],increased the production of superoxide dismutase(SOD) [(29.74±0.71),(31.09±0.83),(30.41±0.65) vs.(14.76±3.99) U/ml,all P<0.01],and lowered the expression of interleukin-6(IL-6) [(24.62±7.69),(27.04±3.14),(33.38±18.86) vs.(230.67±33.53) pg/ml,all P<0.01] and tumor necrosis factor-α(TNF-α) [(41.72±6.10),(17.02±6.82),(3.73±2.26) vs.(228.71±41.53) pg/ml,all P<0.01] in Ox-LDL treated EPCs.These results suggest that Danshen may exert a protective effect through its antioxidant and anti-inflammatory features. | Kang-ting JI Jun-de CHAI Cheng XING Jin-liang NAN Peng-lin YANG Ji-fei TANG | 2010 | Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)2010，11，8： | 9 |
| 3 | Geochemical Anomaly at the Devonian/Carboniferous Boundary, Huangmao, Gnangxi, China显示文摘The abundances of nearly 40 elements, Ir included, have been measured using radio-chemical and instrumental neutron activation analysis (RNAA and INAA) across a Devonian/Carboniferous (D/C) boundary section at Huangmao, Guangxi, China. The Ir anomaly has been found in the D/C boundary bed. Its peak value is 156 ppt, richer by a factor of 12 than that in the underlying strata. Besides, as with Ir, other siderophile and chalcophile elements such as Au. Ni. Co. As and Sb are also enriched. The cause for the abundance anomalies of Ir and other elemets is discussed. Neither volcanic eruption nor extraterrestrial impact can explain it satisfactorily. The real mechanism for the anomalies awaits further study. | Chai Zhifang~①, Mao Xueying~①, Ma Shulan~①, Bai Shunliang~②,Zhou Yaoqi~①, Ma Jianguo~① and Ning Zhongshan~③ ①Institute of High Energy Physics, Academia Sinica, P. O. Box 2732, Beijing, China②Department of Geology, Beijing University, Beijing, China.③Guangxi Petroleum Exploration & Exploitation Co., Nanning, Guangxi. China. | 1989 | Acta Geologica Sinica(English Edition)1989，63，3： | 5 |
| 4 | Enhanced mechanical property and tunable dielectric property of SiC_(f)/SiC-SiBCN composites by CVI combined with PIP显示文摘The SiBCN matrix via chemical vapor infiltration(CVI)or/and polymer infiltration pyrolysis(PIP)technologies was orderly introduced to SiC_(f)/SiC composites to optimize the mechanical property and electromagnetic(EM)shielding effectiveness simultaneously.The BN interface with the thickness of 350 nm was designed to obtain a little stronger interface bonding.The flexural strength of SiC_(f)/SiC-SiBCN composites reached 545.45±29.59 MPa thanks to the crack deflection between the CVI SiC and CVI SiBCN,as well as CVI SiBCN and PIP SiBCN matrix because of the modulus difference between them.The fracture toughness(KiC)with the value of 16.02±0.94 MPa·m^(1/2) was obtained owing to the extension of crack propagation path.The adverse effect of stronger interface bonding was eliminated by the design of matrix microstructure for SiC_(f)/SiC-SiBCN composites.The thermal conductivity in the thickness direction was 7.64 W·(m·K)^(-1) at 1200℃and the electric resistivity decreased to 1.53×10^(3) Ω·m.The tunable dielectric property was obtained with the coordination of wave-absorption CVI SiBCN matrix and impedance matching PIP SiBCN matrix,and the total shielding effectiveness(SE_(T))attained 30.01 dB.It indicates that the SiC_(f)/SiC-SiBCN composites have great potential to be applied as structural and functional materials. | Chaokun SONG Yongsheng LIU Fang YE Laifei CHENG Pengfei ZHANG Nan CHAI | 2021 | Journal of Advanced Ceramics2021，10，4： | 4 |
| 5 | Ultra-light, high flexible and efficient CNTs/Ti3C2-sodium alginate foam for electromagnetic absorption application显示文摘Ultra-light carboxylic functionalized multi-walled carbon nanotubes(CNTs-COOH) and Ti3C2 MXene hybrids modified sodium alginate(CNTs/Ti3C2-SA) based composite foams were prepared through ice-templated freeze-drying method. The microstructure of the synthesized CNTs/Ti3C2 hybrids and CNTs/Ti3C2-SA foams is characterized by the presence of CNTs inserted between MXene layers which prevents their restacking. The resultant CNTs/Ti3C2 hybrids exhibit a unique sandwich-like hierarchical structure. Scanning electron microscopy(SEM) images show that the CNTs/Ti3C2-SA foam exhibits a heterogeneous anisotropic microstructure and CNTs/Ti3C2 hybrids are homogeneously dispersed in the skeleton of the porous foam. In case that the content of the hybrids amounts 40 mg/cm^3, the CNTs/Ti3C2-SA foam possesses excellent electromagnetic(EM) absorption performance with a minimum reflection coefficient(RCmin) as low as-40.0 dB. In case of a sample thickness of 3.95 mm, the RCminreaches-24.4 dB and the effective absorption bandwidth covers the whole X band from 8.2 to 12.4 GHz. A control test shows that, with the same absorbent content, the CNTs/Ti3C2-SA foam exhibits a far better EM performance than that of CNT-free Ti3C2-SA foam. | Xingmin Liu Nan Chai Zhaoju Yu Hailong Xu Xinliang Li Jiquan Liu Xiaowei Yin Ralf Riedel | 2019 | Journal of Materials Science & Technology2019，35，12： | 3 |
| 6 | Effect of Doped Boron on the Properties of ZnO Thin Films Prepared by Sol-gel Spin Coating显示文摘 | WEN Bin LIU Chaoqian FEI Weidong WANG Hualin LIU Shimin WANG Nan CHAI Weiping | 2014 | Chemical Research in Chinese Universities2014，30，3： | 3 |
| 7 | Design of 60GHz RF Transceiver in CMOS:Challenges and Recent Advances显示文摘With more than 40 years Moore scaling, the speed of CMOS transistors is around 100 GHz. Such fact makes it possible to realize mm-wave circuits in CMOS. However, with the target of achieving broadband and power-efficient operation, 60 GHz CMOS RF transceiver faces severe challenges. After reviewing the technology issues, regarding the 60 GHz applications, this paper discusses design challenges both from the system and the building block levels, and also presents some simulated or measured circuits results. | LI Lianming NIU Xiaokang CHEN Linhui CHAI Yuan ZHANG Tao SHI Jun WANG Aili LUO Ying HE Long CHENG Depeng LIU Nan CUI Tiejun YOU Xiaohu | 2014 | China Communications2014，11，6： | 2 |
| 8 | A simple mix design method for self-compacting concrete显示文摘 | Nan Su Kung-Chung His-Wen Chai | 2001 | Cement and Concrete Research2001，，31： | 1 |
| 9 | Interaction formulae for buckling and failure of orthotropic plates under combined axial compression/tension and shear显示文摘An interaction function was constructed based on the axial compression/tension and shear loads of orthotropic plates.The coefficients of the polynomial function were determined by uniaxial test results.Buckling interaction and failure interaction formulae under combined axial tension/compression and shear loads were established.Based on the uniaxial load test results of orthotropic plates,the buckling load and bearing capacity under any proportion of the combined loads could be predicted by using the proposed interaction formulae.The buckling interaction curves and failure envelopes predicted by the proposed interaction formulae were in excellent agreement with the test results. | Binwen WANG Xiangming CHEN Xiasheng SUN Puhui CHEN Zhe WANG Ya’nan CHAI | 2022 | Chinese Journal of Aeronautics2022，35，3： | 1 |
| 10 | Structural variation and parallel evolution of apomixis in citrus during domestication and diversification显示文摘Apomixis,or asexual seed formation,is prevalent in Citrinae via a mechanism termed nucellar or adventitious embryony.Here,multiple embryos of a maternal genotype form directly from nucellar cells in the ovule and can outcompete the developing zygotic embryo as they utilize the sexually derived endosperm for growth.Whilst nucellar embryony enables the propagation of clonal plants of maternal genetic constitution,it is also a barrier to effective breeding through hybridization.To address the genetics and evolution of apomixis in Citrinae,a chromosome-level genome of the Hongkong kumquat(Fortunella hindsii)was assembled following a genome-wide variation map including structural variants(SVs)based on 234 Citrinae accessions.This map revealed that hybrid citrus cultivars shelter genome-wide deleterious mutations and SVs into heterozygous states free from recessive selection,which may explain the capability of nucellar embryony in most cultivars during Citrinae diversification.Analyses revealed that parallel evolution may explain the repeated origin of apomixis in different genera of Citrinae.Within Fortunella,we found that apomixis of some varieties originated via introgression.In apomictic Fortunella,the locus associated with apomixis contains the FhRWP gene,encoding an RWP-RK domain-containing protein previously shown to be required for nucellar embryogenesis in Citrus.We found the heterozygous SV in the FhRWP and CitRWP promoters from apomictic Citrus and Fortunella,due to either two or three miniature inverted transposon element(MITE)insertions.A transcription factor,FhARID,encoding an AT-rich interaction domain-containing protein binds to the MITEs in the promoter of apomictic varieties,which facilitates induction of nucellar embryogenesis.This study provides evolutionary genomic and molecular insights into apomixis in Citrinae and has potential ramifications for citrus breeding. | Nan Wang Xietian Song Junli Ye Siqi Zhang Zhen Cao Chenqiao Zhu Jianbing Hu Yin Zhou Yue Huang Shuo Cao Zhongjie Liu Xiaomeng Wu Lijun Chai Wenwu Guo Qiang Xu Brandon S.Gaut Anna M.G.Koltunow Yongfeng Zhou Xiuxin Deng | 2022 | National Science Review2022，9，10： | 1 |
| 11 | A simple mix design met- hod for self-compacting concrete显示文摘 | SU Nan HSU Kungchung CHAI Hiswen | 2001 | Cement and Concrete Research2001，31，12： | 1 |
| 12 | Effect of rotating electromagnetic field on the conductivity of aqueous NaC1 solution显示文摘 | Li Nan Chai Feng Chen Lei | 2012 | Advanced Materials Research2012，，： | 1 |
| 13 | Effect of rotating electromagnetic field on the conductivity of aqueous NaCI solution显示文摘 | Li Nan Chai Feng Chen Lei | | 0，，： | 1 |
| 14 | Tensile fracture behavior and strength distribution of SiC f /SiC composites with different SiBN interface thicknesses显示文摘 | Yongsheng Liu Nan Chai Hailong Qin Zan Li Fang Ye Laifei Cheng | 2014 | Ceramics International2014，，： | 1 |
| 15 | A simple mix design method for elf-compacting concrete显示文摘 | SU Nan HSUB Kung-Chung CHAI His-Wen | 2001 | Cem Concr Res2001，31，11： | 1 |
| 16 | A simple mix design method for self-compacting concrete显示文摘 | Nan Su Kung-Chung Hsu His-Wen Chai | 2001 | Cement and Concrete Research2001，，31： | 1 |
| 17 | A simple mix design method for self-compacting concrete显示文摘 | Su Nan Hsu Kung-Chung Chai His-Wen | 2001 | Cement and Concrete Research2001，31，12： | 1 |
| 18 | Identification of different types of Kuroshio intrusion into the South China Sea显示文摘 | Nan Feng Xue Huijie Chai Fei | | 0，，09： | 1 |
| 19 | The input pattern problem on deep learning applied to signal analysis and processing to achieve fault diagnosis显示文摘Dear editor,Generally,one of the most prominent features of modern industrial systems is the massive amount of data collected from various sensors,which poses great challenges to traditional methods of capturing,managing,and storing such huge amounts of data.Similar challenges exist in efficiently interpreting the information obtained with the process measurements[1-3].To address this issue,we use a data-driven met hod,which is considered to be the most effec tive and desirable met hod to address this issue and whose typical methods are deep learning models[4].Moreover,currently,deep learning models are often employed to solve some recognition problems in practical industrial systems and they can be used to improve their recognition accuracy[1,2,4]. | Hao REN Nan LI Yi CHAI Jianfeng QU Qiu TANG Lei HUANG | 2019 | Science China(Information Sciences)2019，62，12： | 1 |
| 20 | A simple mix design method for self-compacting concrete显示文摘 | NAN SU KUNG CHUNG HSU HIS WEN CHAI | 2001 | Cement and Concrete Research2001，31，12： | 1 |
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