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| 1 | Hot Granules Medium Pressure Forming Process of AA7075 Conical Parts显示文摘High strength aluminum alloy plate has a low elongation at room temperature, which leads to the forming of its components need a high temperature. Liquid or gas is used as the pressure-transfer medium in the existing flexible mould forming process, the heat resistance of the medium and pressurizing device makes the application of aluminum alloy plate thermoforming restricted. To solve this problem, the existing medium is replaced by the heat-resisting solid granules and the general pressure equipments are applied. Based on the pressure-transfer performance test of the solid granules medium, the feasibility that the assumption of the extended Drucker-Prager linear model can be used in the finite element analysis is proved. The constitutive equation, the yield function and the theoretical forming limit diagram(FLD) of AA7075 sheet are established. Through the finite element numerical simulation of hot granules medium pressure forming(HGMF) process, not only the influence laws of the process parameters, such as forming temperature, the blank-holder gap and the diameter of the slab, on sheet metal forming performance are discussed, but also the broken area of the forming process is analyzed and predicted, which are coincided with the technological test. The conical part whose half cone angle is 15° and relative height H/d0 is 0.57, is formed in one process at 250℃. The HGMF process solves the problems of loading and seal in the existing flexible mould forming process and provides a novel technology for thermoforming of light alloy plate, such as magnesium alloy, aluminium alloy and titanium alloy. | DONG Guojiang ZHAO Changcai PENG Yaxin LI Ying | 2015 | Chinese Journal of Mechanical Engineering2015，28，3： | 15 |
| 2 | 脑损伤早期神经细胞c-fos基因表达变化与脑水肿显示文摘采用免疫细胞化学方法(ABC)研究大鼠脑损伤早期神经细胞c-fos基因表达变化,探讨脑损伤时神经细胞c-fos基因表达变化与脑水肿的关系。结果发现,脑损伤后仅0.5h,脑损伤区周围神经细胞中c-fos基因表达已明显,伤后3~6h更为显著。同时伴有相应部位脑灰质及脑白质水含量增加。初步研究结果提示,脑损伤早期神经细胞c-fos基因表达变化与脑水肿的发生有密切关系。 | Xu Ruxiang Chen Changcai Yuan Guanqian (Zhujiang Hospital, First Military Medical University ,Guangzhou 510282) | 1995 | 解放军医学杂志1995，20，2： | 11 |
| 3 | Mutations of connexin43 in fetuses with congenital heart malformations显示文摘Background Gap junction channels formed by connexin43 (Cx43) protein are important in cardiac morphogenesis, and Cx43 gene is thought to be associated with congenital heart malformation (CHM). This study was undertaken to detect the mutations of Cx43 in fetuses with CHM.Methods Cx43 extron DNA was amplified by PCR from 16 fetuses with a variety of CHM. The PCR products were analyzed by SSCP and DNA sequencing. Thirty children who had no CHM were selected as controls. Results Eight homozygous mutations of Cx43 were observed in a fetus with double outlet right ventricule (DORV), five of the 8 mutations were missense mutations including Arg239Trp, Ser251Thr, Ala253Pro, Pro283Leu and Thr290Asn, and the remaining 3 were silent polymorphisms including Gly252Gly, Pro256Pro and Thr275Thr. No mutations were found in other fetuses and the control group.Conclusions Mutations of Cx43 may be associated with congenital conotruncal anomalies. PCR-SSCP is an effective method for screening the mutations of Cx43. | CHENPing XIELi-jian HUANGGuo-ying ZHAOXiao-qing CHANGCai | 2005 | Chinese Medical Journal2005，，12： | 10 |
| 4 | Observational evidences for the speed of the gravity based on the Earth tide显示文摘We have found that the current practical Newtonian formula for the gravity tide of the Earth implies a hypothesis that gravity travels at the speed of light; furthermore, we have derived and solved the propagation equation of gravity using the observation data of Earth tides from Shiquanhe and Wushi, after correction of phase lag due to the anelasticity of the Earth, and found that the speeds of gravity are from 0.93 to 1.05 times the speed of light with a relative error of about 5%. This provides first set of strong evidences to show that the speed of gravity is the same as the speed of light. | TANG KeYun HUA ChangCai WEN Wu CHI ShunLiang YOU QingYu YU Dan | 2013 | Chinese Science Bulletin2013，58，4： | 8 |
| 5 | Erasure-Correction-Enhanced Iterative Decoding for LDPC-RS Product Codes显示文摘Low-density parity-check(LDPC)codes are widely used due to their significant errorcorrection capability and linear decoding complexity.However,it is not sufficient for LDPC codes to satisfy the ultra low bit error rate(BER)requirement of next-generation ultra-high-speed communications due to the error floor phenomenon.According to the residual error characteristics of LDPC codes,we consider using the high rate Reed-Solomon(RS)codes as the outer codes to construct LDPC-RS product codes to eliminate the error floor and propose the hybrid error-erasure-correction decoding algorithm for the outer code to exploit erasure-correction capability effectively.Furthermore,the overall performance of product codes is improved using iteration between outer and inner codes.Simulation results validate that BER of the product code with the proposed hybrid algorithm is lower than that of the product code with no erasure correction.Compared with other product codes using LDPC codes,the proposed LDPC-RS product code with the same code rate has much better performance and smaller rate loss attributed to the maximum distance separable(MDS)property and significant erasure-correction capability of RS codes. | Weigang Chen Ting Wang Changcai Han Jinsheng Yang | 2021 | China Communications2021，18，1： | 5 |
| 6 | Sequencing barcode construction and identification methods based on block error-correction codes显示文摘Multiplexed sequencing relies on specific sample labels,the barcodes,to tag DNA fragments belonging to different samples and to separate the output of the sequencers.However,the barcodes are often corrupted by insertion,deletion and substitution errors introduced during sequencing,which may lead to sample misassignment.In this paper,we propose a barcode construction method,which combines a block error-correction code with a predetermined pseudorandom sequence to generate a base sequence for labeling different samples.Furthermore,to identify the corrupted barcodes for assigning reads to their respective samples,we present a soft decision identification method that consists of inner decoding and outer decoding.The inner decoder establishes the hidden Markov model(HMM)for base insertion/deletion estimation with the pseudorandom sequence,and adapts the forward-backward(FB)algorithm to output the soft information of each bit in the block code.The outer decoder performs soft decision decoding using the soft information to effectively correct multiple errors in the barcodes.Simulation results show that the proposed methods are highly robust to high error rates of insertions,deletions and substitutions in the barcodes.In addition,compared with the inner decoding algorithm of the barcodes based on watermarks,the proposed inner decoding algorithm can greatly reduce the decoding complexity. | Weigang Chen Lixia Wang Mingzhe Han Changcai Han Bingzhi Li | 2020 | Science China(Life Sciences)2020，63，10： | 4 |
| 7 | POLYNOMIAL MODEL BASED FAST FRACTIONAL PIXEL SEARCH ALGORITHM FOR H.264/AVC显示文摘This paper proposed a novel fast fractional pixel search algorithm based on polynomial model. With the analysis of distribution characteristics of motion compensation error surface inside fractional pixel searching window, the matching error is fitted with parabola along horizontal and vertical direction respec-tively. The proposed searching strategy needs to check only 6 points rather than 16 or 24 points, which are used in the Hierarchical Fractional Pel Search algorithm (HFPS) for 1/4-pel and 1/8-pel Motion Estimation (ME). The experimental results show that the proposed algorithm shows very good capability in keeping the rate distortion performance while reduces computation load to a large extent compared with HFPS algorithm. | Xi Yinglai Hao Chongyang Lai Changcai | 2006 | Journal of Electronics(China)2006，23，6： | 3 |
| 8 | Brazing diamond grits onto AA7075 aluminium alloy substrate with Ag–Cu–Ti filler alloy by laser heating显示文摘The brazing of diamond is a promising way to fabricate grinding wheels for efficient machining and precision grinding.This work investigated the feasibility of bonding diamond grits onto Aluminium Alloy 7075(AA7075)substrate with a Ag–Cu–Ti filler alloy via laser fusion brazing.The interfacial microstructures and the strength of the brazed diamond joints were studied.The cross-section of the brazed diamond joint consists of a molten filler alloy layer,a molten pool,a heat effect zone,a columnar crystal zone and an equiaxed crystal zone.Within the interface of the filler alloy/substrate metal,microstructures observed possibly were Ag(s.s),Al(s.s),Tix Al,Al2 Cu and Mg intermetallic compounds.A layer of Ti C with a thickness of about 30–50 nm was found at the bonding interface of the diamond/filler alloy.The averaged peak shear force of the brazed joints was found to be approximately 39.8 N.The abrasion grinding test indicated that the diamond/AA7075 brazed joint was adequate for grinding.However,the pulled-off of grit was found to be the primary failure of this type of brazed joint.This work broadened the brazing diamond technique and the range of applications of brazed diamond wheels for efficient grinding. | Guoqin HUANG Yingda WANG Meiqin ZHANG Changcai CUI Zhen TONG | 2021 | Chinese Journal of Aeronautics2021，34，6： | 3 |
| 9 | Microstructure and giant baro-caloric effect induced by low pressure in Heusler Co_(51)Fe_(1)V_(33)Ga_(15) alloy undergoing martensitic transformation显示文摘Solid-state refrigeration based on the magneto-or mechano-caloric effect,including elasto-and barocaloric in ferroic phase transition materials is promising to replace the current vapor compression refrigeration in consideration of environmental-friendliness and energy-saving.However,both high driven field and small thermal changes in all of these caloric materials hinder the development of solid-state refrigeration.Here we report a giant baro-caloric effect near room temperature induced by a low hydrostatic pressure in Co-based Co_(51)Fe_(1) V_(33)Ga_(15) Heusler alloy.The maximum adiabatic temperature change under the applied pressure change ofΔp=0.1-100 MPa can be as high asΔ_(Tad)^(Max)=7.7 K(Δ_(Tad)^(Max)/Δpreaches up to~7.7 K kbar-1),surpassing theΔ_(Tad)^(Max)/Δpvalue reported hitherto in baro-caloric alloys.In addition,the microstructure is also studied by using the electron microscopes.Along with the austenite and martensite,the submicron V-rich particles are precipitated in this alloy,which are believed to account for enhancing mechanical properties. | Kai Liu Hai Zeng Ji Qi Xiaohua Luo Xuanwei Zhao Xianming Zheng Yuan Yuan Changcai Chen Shengcan Ma Ren Xie Bing Li Zhenchen Zhong | 2021 | Journal of Materials Science & Technology2021，，14： | 2 |
| 10 | Geometric constraint solving with conics and linkages 显示文摘 | Gao XiaoShan Jiang Kun Zhu ChangCai | 2002 | Computer-Aided Design2002，34，6： | 1 |
| 11 | The C_(6)D_(6)detector system on the Back-n beam line of CSNS显示文摘Introduction The neutron capture cross sections are very important in the field of nuclear device design and basic physics research.Hydrogen-free liquid scintillator such as C_(6)D_(6)detectors are widely used in the neutron capture cross-sectional measurements for the low neutron sensitivity and fast time response.The Back-n white neutron source at China Spallation Neutron Source is the first spallation white neutron source in China,and it is suitable for neutron capture cross-sectional measurement.Materials and methods A C_(6)D_(6)detector system was built in the Back-n experimental station.The pulse height weighting technique was used to determine the system’s detection efficiency.The response to gamma rays of the C_(6)D_(6)detector was measured,and the energy resolution function was determined.Monte Carlo simulation with Geant4 code was carried out to get the weighting function of this C_(6)D_(6)detector system.Additionally,the systematic uncertainty of the weighting function was also determined.Conclusion According to the experimental and simulation results,this C_(6)D_(6)detector system can be used to measure neutron capture cross section. | Jie Ren Xichao Ruan Jie Bao Guangyuan Luan Wei Jiang Qi An Huaiyong Bai Ping Cao Qiping Chen Yonghao Chen Pinjing Cheng Zengqi Cui Ruirui Fan Changqing Feng Minhao Gu Fengqin Guo Changcai Han Zijie Han Guozhu He Yongcheng He Yuefeng He Hanxiong Huang Weiling Huang Xiru Huang Xiaolu Ji Xuyang Ji Haoyu Jiang Hantao Jing Ling Kang Mingtao Kang Bo Li Lun Li Qiang Li Xiao Li Yang Li Yang Li Rong Liu Shubin Liu Xingyan Liu Yinglin Ma Changjun Ning Binbin Qi Zhaohui Song Hong Sun Xiaoyang Sun Zhijia Sun Zhixin Tan Hongqing Tang Jingyu Tang Pengcheng Wang Qi Wang Taofeng Wang Yanfeng Wang Zhaohui Wang Zheng Wang Jie Wen Zhongwei Wen Qingbiao Wu Xiaoguang Wu Xuan Wu Likun Xie Yiwei Yang Han Yi Li Yu Tao Yu Yongji Yu Guohui Zhang Jing Zhang Linhao Zhang Liying Zhang Qingmin Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Yingtan Zhao Liang Zhou Zuying Zhou Danyang Zhu Kejun Zhu Peng Zhu | 2019 | Radiation Detection Technology and Methods2019，3，3： | 1 |
| 12 | Bit-Level Composite Signal Design for Simultaneous Ranging and Communication显示文摘As the complexity of space exploration missions augments,how to enhance the overall performance of communication,ranging or other functions has become a challengeable problem.Considering the integration of communication and ranging,we present a bit-level composite signal for simultaneous ranging and communication.In this composite method,through a specially designed mapping scheme using low-weight codewords,the information sequence is converted to a sparse sequence which is then superimposed on the ranging code.For ranging,the correlation characteristics of the ranging code component can be maintained to calculate the transmitter-receiver distance.For communications,the sparse sequence can be extracted without interference by eliminating the ranging code component.Simulation results show that the proposed composite signal can support communication and ranging simultaneously with limited sacrifice of ranging performance,and the performance loss of ranging can be controlled and minimized by lowering the density of information sequences using different sparsification encoding methods. | Weigang Chen Yalong He Changcai Han Jinsheng Yang Zhan Xu | 2021 | China Communications2021，18，6： | 1 |
| 13 | Effects of long-term low-dose cadmium exposure on genomic DNA methylation in human embryo lung fibroblast cells显示文摘 | Gaofeng Jiang Lei Xu Shizhen Song Changcai Zhu Qing Wu Ling Zhang Lei Wu | 2007 | Toxicology2007，，1： | 1 |
| 14 | Research on the uncertainties from different form error evaluation methods by CMM sampling显示文摘 | Changcai Cui Shiwei Fu Fugui Huang | 2009 | International Joumal of Advanced Man- ufacturing Technology2009，43，12： | 1 |
| 15 | Magnetic-field-driven reverse martensitic transformation with multiple magneto-responsive effects by manipulating magnetic ordering in Fe-doped Co-V-Ga Heusler alloys显示文摘Nowadays,searching for the materials with multiple magneto-functional properties and good mechanical properties is vital in various fields,such as solid-state refrigeration,magnetic actuators,magnetic sensors and intelligent/smart devices.In this work,the magnetic-field-induced metamagnetic reverse martensitic transformation(MFIRMT)from paramagnetic martensite to ferromagnetic austenite with multiple magneto-responsive effects is realized in Fe-doped Co-V-Ga Heusler alloys by manipulating the magnetic ordering.The martensitic transformation temperature Tmreduces quasi-linearly with increasing Fe-content.In strikingly contrast with the Fe-free alloys,the magnetization difference(M')across martensitic transformation increases by three orders of magnitude for Fe-doped alloys.The increased M'should be ascribed to the reduction of Tm,almost unchanged Curie temperature of austenite and the increased magnetic moment in the samples with higher Fe-content.The large M'provides strong driving force to realize the MFIRMT and accordingly multiple magneto-responsive effects,such as magnetocaloric,magnetoresistance and magnetostriction effects.Meanwhile,giant Vickers hardness of 518 HV and compressive strength of 1423 MPa are achieved.Multiple magneto-responsive effects with exceptional mechanical properties make these alloys great potential candidates for applications in many fields. | Kai Liu Shengcan Ma Yuxi Zhang Hai Zeng Guang Yu Xiaohua Luo Changcai Chen Sajjad Ur Rehman Yongfeng Hu Zhenchen Zhong | 2020 | Journal of Materials Science & Technology2020，58，23： | 1 |
| 16 | Efficient Semi‑Transparent Wide‑Bandgap Perovskite Solar Cells Enabled by Pure‑Chloride 2D‑Perovskite Passivation显示文摘Wide-bandgap(WBG)perovskite solar cells suffer from severe non-radiative recombination and exhibit relatively large opencircuit voltage(V_(OC))deficits,limiting their photovoltaic performance.Here,we address these issues by in-situ forming a well-defined 2D perovskite(PMA)_(2)PbCl_(4)(phenmethylammonium is referred to as PMA)passivation layer on top of the WBG active layer.The 2D layer with highly pure dimensionality and halide components is realized by intentionally tailoring the side-chain substituent at the aryl ring of the post-treatment reagent.First-principle calculation and single-crystal X-ray diffraction results reveal that weak intermolecular interactions between bulky PMA cations and relatively low cation-halide hydrogen bonding strength are crucial in forming the well-defined 2D phase.The(PMA)_(2)PbCl_(4)forms improved type-I energy level alignment with the WBG perovskite,reducing the electron recombination at the perovskite/hole-transport-layer interface.Applying this strategy in fabricating semi-transparent WBG perovskite solar cells(indium tin oxide as the back electrode),the V_(OC)deficits can be reduced to 0.49 V,comparable with the reported state-of-the-art WBG perovskite solar cells using metal electrodes.Consequently,we obtain hysteresis-free 18.60%-efficient WBG perovskite solar cells with a high V_(OC)of 1.23 V. | Liu Yang Yongbin Jin Zheng Fang Jinyan Zhang Ziang Nan Lingfang Zheng Huihu Zhuang Qinghua Zeng Kaikai Liu Bingru Deng Huiping Feng Yujie Luo Chengbo Tian Changcai Cui Liqiang Xie Xipeng Xu Zhanhua Wei | 2023 | Nano-Micro Letters2023，15，8： | 1 |
| 17 | Cross-sectional Seroprevalence and Genotype of Hepatitis E Virus in Humans and Swine in a High-density Pig-farming Area in Central China显示文摘Hepatitis E virus(HEV)infection is a common public health problem in developing countries.However,the current prevalence of HEV and the relationship of HEV genotype between swine and human within high-density pig-farming areas in central China are still inadequately understood.Here,cross-sectional serological and genotypic surveys of HEV among the 1232 general population,273 workers occupationally exposed to swine,and 276 pigs in a high-density pig-breeding area,were undertaken by ELISA and nested RT-PCR methods.Anti-HEV IgG was detected in 26.22%of general population and 48.35%of occupational workers.The prevalence of swine serum HEV-Ag was 6.52%.The prevalence of anti-HEV IgG was significantly higher among the workers occupationally exposed to swine than among the general population.An increased HEV seropositivity risk among the general population was associated with either being a peasant or male and was very strongly associated with the increase of age.Among the occupationally exposed group,the prevalence of anti-HEV IgG antibodies increased with age and working years.Among the 30 HEV-IgM-positive people,the infection rates of clerks in the public,peasants,pork retailers,and pig farmers were higher than those of others.A phylogenetic analysis revealed that all the isolates belonged to subgenotype 4d,and four people and four pigs shared 97.04%-100%sequence homology.This study revealed a high HEV seroprevalence among the general population and workers occupationally exposed to swine in the Anlu City,and supports the notion that swine are a source of human HEV infection. | Yilin Shu Yameng Chen Sheng Zhou Shoude Zhang Qin Wan Changcai Zhu Zhijiang Zhang Hailong Wu Jianbo Zhan Ling Zhang | 2019 | Virologica Sinica2019，34，4： | 1 |
| 18 | Genetic algorithm based form error evaluation 显示文摘 | Cui Changcai Li Bing Huang Fugui | 2007 | Measurement Science and Technology2007，18，7： | 1 |
| 19 | Level set con- tour extraction method based on support value filter 显示文摘 | YANG Changcai ZHENG Sheng YE Jin | 2008 | Applied Mathematics and Computation2008，205，2： | 1 |
| 20 | Flexi-ble- die Forming Process with Solid Granule Mediumon Sheet Metal 显示文摘 | Dong Guojiang Zhao Changcai Cao Miaoyan | 2013 | Transactions of Nonferrous MetalsSociety of China (English Edition)2013，23，9： | 1 |
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