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| 1 | Robust cooperative spectrum sensing schemes for fading channels in cognitive radio networks显示文摘In cognitive radio systems, cooperative spectrum sensing can detect the presence of the primary user accurately. In practice, however, since the sensing observations are forwarded to a data collector through fading channels, the sensing performance is severely degraded. To deal with this problem, in this paper, we first propose a secondary user selection based cooperative spectrum sensing method to improve sensing performance by decreasing the reporting errors introduced by the fading channels. More specifically, only the secondary users with better signal-to-noise ratio (SNR) for reporting channels are allowed to send their local binary decisions (0 or 1) to the data collector while the others will send nothing. Additionally, we further propose a diversity based cooperative spectrum sensing method which applies existing space-time coding. By exploiting space diversity in CR network, the reporting errors introduced by the fading channel can be decreased and then the sensing performance is improved significantly. For either proposed cooperative spectrum sensing method, the sensing performance is derived and the analytical performance results are given. Our analysis and numerical results verify that proposed methods outperform the conventional cooperative spectrum sensing with OR-rule by taking into account the error effect on the reporting channels. | YUE WenJing ZHENG BaoYu MENG QingMin CUI JingWui XIE PeiZhong | 2011 | Science China(Information Sciences)2011，54，2： | 9 |
| 2 | Targeting Gut Microbiota Dysbiosis: Potential Intervention Strategies for Neurological Disorders显示文摘It is well known that the gut microbiota plays an extremely important role in modulating host physiological functions such as immunity and metabolic homeostasis.In recent years,accumulated evidence has revealed that the gut microbiota can regulate the functions of the central nervous system(CNS)through the gut-brain axis,which provides a novel insight into the interactions between the gut and brain.This review focuses on the molecular mechanism of the crosstalk between the gut microbiota and the brain via the gut-brain axis,and on the onset and development of neurological disorders triggered by gut microbiota dysbiosis.These topics are followed by a critical analysis of potential intervention strategies targeting gut microbiota dysbiosis,including the use of probiotics,prebiotics,synbiotics,and diets.While research on the microbiota-gut-brain axis is still in its relative infancy,clarifying the molecular mechanism that underlies how the gut microbiota regulates neurological functions not only holds the promise of revealing potentially novel pathogeneses of neurological disorders,but also may lead to the development of potential diagnosis biomarkers and intervention strategies targeting microbiota dysbiosis for neurological disorders. | Wanqiang Wu Qingmin Kong Peijun Tian Qixiao Zhai Gang Wang Xiaoming Liu Jianxin Zhao Hao Zhang Yuan Kun Lee Wei Chen a | 2020 | Engineering2020，6，4： | 7 |
| 3 | Small sample Bayesian analyses in assessment of weapon performance显示文摘Abundant test data are required in assessment of weapon performance.When weapon test data are insufficient,Bayesian analyses in small sample circumstance should be considered and the test data should be provided by simulations.The several Bayesian approaches are discussed and some limitations are founded. An improvement is put forward after limitations of Bayesian approaches available are analyzed and the improved approach is applied to assessment of some new weapon performance. | Li Qingmin Wang Hongwei Liu Jun | 2007 | Journal of Systems Engineering and Electronics2007，18，3： | 6 |
| 4 | Experimental demonstration of ultra-large-scale terahertz all-dielectric metamaterials显示文摘All-dielectric metamaterials have emerged as a promising platform for low-loss and highly efficient terahertz devices. However, existing fabrication methods have difficulty in achieving a good balance between precision and cost. Here, inspired by the nano-template-assisted self-assembly method, we develop a micro-templateassisted self-assembly(MTAS) method to prepare large-scale, high-precision, and flexible ceramic microsphere all-dielectric metamaterials with an area exceeding 900 cm × 900 cm. Free from organic solvents, vacuum, and complex equipment, the MTAS method ensures low-cost and environmentally friendly fabrication. The ceramic microsphere resonators can be readily assembled into nearly arbitrary arrangements and complex aggregates, such as dimers, trimers, quadrumers, and chains. Finally, using the heat-shrinkable substrate and dipole coupling effect, a broadband reflector with a bandwidth of 0.15 THz and a reflection of up to 95% is demonstrated.This work provides a versatile and powerful platform for terahertz all-dielectric metamaterials, with potential to be applied in a wide variety of high-efficiency terahertz devices. | KE BI DAQUAN YANG JIA CHEN QINGMIN WANG HONGYA WU CHUWEN LAN YUPING YANG | 2019 | Photonics Research2019，7，4： | 5 |
| 5 | Beamlet prestack depth migration and illumination: A test based on the Marmousi model显示文摘Beamlet 来源容易让强壮的本地、方向性的人物和罐头完成本地照明和移植。而且,他们比常规迁居方法提供更好的迁居结果。我们介绍让的横梁的基本原则包括窗口的 Fourier 变换和框架理论的 prestack 深度移植。我们基于 Gaussian 功能解释 Gabor-Daubechies (G-D ) 框架。Beamlet 分解在波浪地的本地空格和方向提供信息。我们综合横梁让来源和横梁在使用矩形和 Gaussian 窗口的小浪域让记录然后外推有一个 Fourier 有限差别的操作符的综合数据。我们用标准 Marmousi 模型测试方法。由比较并且分析让并且微笑的方向性的横梁与不同窗户和方向让的单身者的迁居结果,我们证明有 Gaussian 横梁的 prestack 深度迁居的有效性让方法。 | Ye Yueming Li Zhenchun Han Wengong Liu Qingmin | 2006 | Applied Geophysics2006，3，4： | 5 |
| 6 | Compositions of aliphatic des-A-triterpenes in the Hani peat deposit,Northeast China and its biological significance显示文摘Aliphatic des-A-triterpenes,the degradation products of pentacyclic triterpenes have been tentatively assigned in samples taken from a 963-cm-thick peat sequence from the Hani region of Northeast China using gas chromatography-mass spectrometry(GC-MS)in order to understand and identify these des-A-triterpenes response to climate and ecology.The study indicates that aliphatic des-A-triterpenes are abundant in the Hani peat bog.The high relative abundance of the total des-A-triterpenes mainly occurs at the Holocene periods and is corresponding to the low sedimentation rate.The mechanism of des-A-triterpenes accumulation is not consistent with the previous studies.It is proposed that the biological community is also one influence factor.The obvious stage variations of the total des-A-triterpenes in the whole sequence reveal the different biological(microbes and plants) processes and responses,possibly revealing the four large replacements of biological community and functional composition in the swamp environment over the 16000 cal a BP.The low total des-A-triterpenes values occur at about 10200,8700,7700,6600,4480-3940 and 3040 cal a BP,reflecting the multiple millennial micro-environment oscillations under the macro-environment of the swamp during the Holocene.The ratios of diene and monoene des-A-triterpenes(DT/MT),des-A-lupane and diene and monoene des-A-triterpenes(DL/(DT+MT)),ratios ofindividual compounds exhibit vertical opposite to the total des-A-triterpenes. Namely,these ratios are high during the last deglaciation and late Holocene whereas they are low at other periods,indicating different compounds have different responses to micro-environment and microbial activities.This study discusses the diversity of biological community and biological functional composition response to micro-environment,which not only provides the complement in Northeast China,but also bears important fundamental information for the implication to ecological environment in the future. | ZHENG YanHong ZHOU WeiJian LIU Zhao CHEN QingMin YU XueFeng LIU XiaoMin | 2010 | Chinese Science Bulletin2010，55，21： | 5 |
| 7 | Room-temperature production of silver-nanofiber film for large-area, transparent and flexible surface electromagnetic interference shielding显示文摘A kind of pollution known as electromagnetic interference(EMI),which results from ubiquitous usage of various electronic communication and military radar equipment,has been receiving increasing attention recently.However,large-area EMI shielding on transparent and/or curved surfaces,including building windows,curved glass wall,and special requirements spaces(SRSs),remains hard to achieve.In this paper,a silver nanofiber(AgNF)based flexible and transparent EMI shielding film was successfully assembled via a room-temperature roll-to-roll production method.For transparent application scenario,AgNF with 89%transmittance in visible range and 1μm thickness shows~20 dB shielding efficiency(EMI SE).On the other hand,total shielding(>50 dB)is obtained when the thickness of AgNF increases to 10μm,while its transmittance in visible range remains higher than 75%.Considering the facile and scale-free production technology,this material can be readily applied in large-scale,transparent,and/or SRSs EMI shielding. | Sen Lin Haiyang Wang Fan Wu Qingmin Wang Xiaopeng Bai Di Zu Jianan Song Dong Wang Zhenglian Liu Ziwei Li Nian Tao Kai Huang Ming Lei Bo Li Hui Wu | 2019 | npj Flexible Electronics2019，3，1： | 4 |
| 8 | Energy-Efficient Joint Caching and Transcoding for HTTP Adaptive Streaming in 5G Networks with Mobile Edge Computing显示文摘With the new promising technique of mobile edge computing (MEC) emerging, by utilizing the edge computing and cloud computing capabilities to realize the HTTP adaptive video streaming transmission in MEC-based 5G networks has been widely studied. Although many works have been done, most of the existing works focus on the issues of network resource utilization or the quality of experience (QoE) promotion, while the energy efficiency is largely ignored. In this paper, different from previous works, in order to realize the energy efficiency for video transmission in MEC-enhanced 5G networks, we propose a joint caching and transcoding schedule strategy for HTTP adaptive video streaming transmission by taking the caching and transcoding into consideration. We formulate the problem of energy-efficient joint caching and transcoding as an integer programming problem to minimize the system energy consumption. Due to solving the optimization problem brings huge computation complexity, therefore, to make the optimization problem tractable, a heuristic algorithm based on simulated annealing algorithm is proposed to iteratively reach the global optimum solution with a lower complexity and higher accuracy. Finally, numerical simulation results are illustrated to demonstrated that our proposed scheme brings an excellent performance. | Renchao Xie Zishu Li Jun Wu Qingmin Jia Tao Huang | 2019 | China Communications2019，16，7： | 4 |
| 9 | Effect of Shenqi Yangxin decoction on high mobility group box 1and inflammatory signal pathway in a rat model of dilated cardiomyopathy显示文摘OBJECTIVE: To investigate the effects of Shenqi Yangxin decoction(SQYXD) on heart function in a rat model of dilated cardiomyopathy(DCM) and its potential mechanisms.METHODS: Sprague-Dawley rats were randomly divided into normal(10 rats) and DCM(150 rats)groups. DCM was induced by an intraperitoneal injection of adriamycin. Then, DCM baseline group was randomly selected sixteen DCM rats. The remaining DCM rats were randomly divided into DCM control, perindopril, metoprolol, and SQYXD groups. Cardiac function and histological analysis plus biochemical measurement of serum levels of brain natriuretic peptide(BNP), and inflammatory factors were measured. The mRNA and protein expression levels of high-mobility group box 1(HMGB1), Toll-like receptor 4(TLR-4), receptor for advanced glycation end products(RAGE), and nuclear factor-κB(NF-κB) were determined. Myocardial metabolism imaging was performed on the normal, SQYXD and DCM control groups to evaluate the effectiveness of treatments.RESULTS: Rats in the DCM control group exhibited dilated left ventricular diameter, impaired cardiac function, disorganized sarcomere, impaired glucose metabolism, increased heart weight index,and increased levels of BNP, which were improved by treatment with SQYXD. In addition, hearts from rats in the DCM baseline group exhibited significantly higher levels of HMGB1, TLR-4, RAGE, NF-κB,tumor necrosis factor-α, interleukin-1, interleukin-6, interleukin-10, compared with the normal group. Interestingly, the mRNA level of HMGB1 in the DCM baseline group was positively correlated with that of TLR-4, RAGE, NF-κB, BNP, and LVEDD,but negatively correlated with LVEF. SQYXD inhibited the upregulation of HMGB1 expression and its downstream inflammatory factors.CONCLUSION: Shenqi Yangxin decoction effectively reduced the dilated left ventricular diameter and improved heart function in dilated cardiomyopathy. The mechanisms underlying the action on DCM involve regulating the gene and protein expression of HMGB1 and its inflammatory signal pathways in the DCM rat model. | Shen Lijuan Lu Shu Zhou Yonghua Xing Qingmin Zhou Chungang Li Lan | 2018 | Journal of Traditional Chinese Medicine2018，38，6： | 4 |
| 10 | Evaluation technology and practice of continental shale oil development in China显示文摘This paper analyzes the differences in geological and development characteristics between continental shale oil in China and marine shale oil in North America, reviews the evaluation methods and technological progress of the continental shale oil development in China, and points out the existing problems and development directions of the continental shale oil development. The research progress of development evaluation technologies such as favorable lithofacies identification, reservoir characterization, mobility evaluation, fracability evaluation, productivity evaluation and geological-mathematical modeling integration are introduced. The efficient exploration and development of continental shale oil in China are faced with many problems, such as weak basic theoretical research, imperfect exploration and development technology system, big gap in engineering technology between China and other countries, and high development cost. Three key research issues must be studied in the future:(1) forming differentiated development technologies of continental shale oil through geological and engineering integrated research;(2) strengthening the application of big data and artificial intelligence to improve the accuracy of development evaluation;(3) tackling enhanced shale oil recovery technology and research effective development method, so as to improve the development effect and benefit. | LI Yang ZHAO Qingmin LYU Qi XUE Zhaojie CAO Xiaopeng LIU Zupeng | 2022 | Petroleum Exploration and Development2022，49，5： | 3 |
| 11 | Method for Caution Values Calculation of Dissolved Gases in Transformers Based on Statistical Distribution and Correlation Analysis显示文摘Before diagnosed by DGA (dissolved gas analysis) methods, gas caution values, which index the level of gas formation, must be used to evaluate the possibility of incipient faults to reduce the misdiagnosis in the normal state. However, the calculation of these values is now only based on cumulative percentile method without taking into account operating conditions. To overcome this disadvantage, a new approach to calculate the transformer caution values is presented. This approach is based on statistical distribution and correlation analysis, and it takes the individual variation and fluctuation caused by internal and external factors into consideration. Then 6550 transformer DGA data collected from North China Power Grid are analyzed in this paper. The results show that the volume fraction of TH (total hydrocarbon) approximately obeys normal distribution when the 3-sigma rule is used to calculate its caution value. The volume fraction of CO has a strong positive correlation with oil temperature. For H2, the negative correlation with oil temperature is significant when the volume fraction is not very low. The caution value curves for CO and H2 are obtained by regression analyses. Thus, the gas caution values/curves obtained using the new method are not always constant, but vary with oil temperature, which is an advantage of the proposed method compared with cumulative percentile method. The variation of gas caution values/curves also reflects the influence of the external factors, for instance, va- rying with monitoring time ensures that the gas caution values are always consistent with operating status. | WANG Xuelei LI Qingmin LI Chengrong YANG Rui GAO Shuguo | 2013 | 高电压技术2013，39，8： | 3 |
| 12 | Synthesis of ITQ-2 zeolite under static conditions and its properties显示文摘Using silica gel as the precursor, MCM-22(p) was synthesized under the static conditions. Then ITQ-2 zeolite was obtained by using n-cetyltrimethylammonium bromide (CTAB) and tetrapro- pylammonium hydroxide (TPAOH) as the swelling agents to swell the pores of MCM-22(p). The ob- tained zeolite was characterized by XRD, SEM, BET, NH3-TPD. The results show that the zeolite had the best swelling when MCM-22(p):CTAB:TPAOH=1:4:1. The synthesis duration and temperature did not influence significantly the pore swelling. Except TPAOH, CTAB can also be used together with tetrabuthylammonium hydroxide (TBAOH) as the pore swelling agent. There was contribution of sur- face area and pore volume from the mesoporous pores in the ITQ-2 zeolite and it also showed weaker acidity than MCM-22. However, the ITQ-2 supported NiW catalyst showed higher activity and selec- tivity to the middle distillates in the hydrocracking of vacuum gasoil (VGO) than MCM-22 supported catalyst. This implied that the diffusion of large molecules of heavy oil in the catalyst was facilitated due to the presence of the mesoporous pores and hence higher activity and selectivity to middle dis- tillates. | LIU Baijun HUO Huijuan MENG Qingmin GAO Shansong | 2006 | Science China Chemistry2006，49，2： | 3 |
| 13 | High wall-plug efficiency 808-nm laser diodes with a power up to 30.1 W显示文摘A very highly efficient InGaAlAs/AlGaAs quantum-well structure was designed for 808 nm emission,and laser diode chips 390-μm-wide aperture and 2-mm-long cavity length were fabricated.Special pretreatment and passivation for the chip facets were performed to achieve improved reliability performance.The laser chips were p-side-down mounted on the AlN submount,and then tested at continuous wave(CW)operation with the heat-sink temperature setting to 25℃using a thermoelectric cooler(TEC).As high as 60.5%of the wall-plug efficiency(WPE)was achieved at the injection current of 11 A.The maximum output power of 30.1 W was obtained at 29.5 A when the TEC temperature was set to 12°C.Accelerated life-time test showed that the laser diodes had lifetimes of over 62111 h operating at rated power of 10 W. | Zhanqiang Ren Qingmin Li Bo Li Kechang Song | 2020 | Journal of Semiconductors2020，41，3： | 3 |
| 14 | An enrichment model using regular health examination data for early detection of colorectal cancer显示文摘Objective: Challenges remain in current practices of colorectal cancer(CRC) screening, such as low compliance,low specificities and expensive cost. This study aimed to identify high-risk groups for CRC from the general population using regular health examination data.Methods: The study population consist of more than 7,000 CRC cases and more than 140,000 controls. Using regular health examination data, a model detecting CRC cases was derived by the classification and regression trees(CART) algorithm. Receiver operating characteristic(ROC) curve was applied to evaluate the performance of models. The robustness and generalization of the CART model were validated by independent datasets. In addition, the effectiveness of CART-based screening was compared with stool-based screening.Results: After data quality control, 4,647 CRC cases and 133,898 controls free of colorectal neoplasms were used for downstream analysis. The final CART model based on four biomarkers(age, albumin, hematocrit and percent lymphocytes) was constructed. In the test set, the area under ROC curve(AUC) of the CART model was 0.88 [95%confidence interval(95% CI), 0.87-0.90] for detecting CRC. At the cutoff yielding 99.0% specificity, this model’s sensitivity was 62.2%(95% CI, 58.1%-66.2%), thereby achieving a 63-fold enrichment of CRC cases. We validated the robustness of the method across subsets of test set with diverse CRC incidences, aging rates, genders ratio, distributions of tumor stages and locations, and data sources. Importantly, CART-based screening had the higher positive predictive value(1.6%) than fecal immunochemical test(0.3%).Conclusions: As an alternative approach for the early detection of CRC, this study provides a low-cost method using regular health examination data to identify high-risk individuals for CRC for further examinations. The approach can promote early detection of CRC especially in developing countries such as China, where annual health examination is popular but regular CRC-specific screening is rare. | Qiang Shi Zhaoya Gao Pengze Wu Fanxiu Heng Fuming Lei Yanzhao Wang Qingkun Gao Qingmin Zeng Pengfei Niu Cheng Li Jin Gu | 2019 | Chinese Journal of Cancer Research2019，31，4： | 3 |
| 15 | RNA-seq reveals the critical role of Csp A in regulating Brucella melitensis metabolism and virulence显示文摘Brucella melitensis is a facultative intracellular bacterium that replicates within macrophages. The ability of Brucella to survive and multiply in the hostile environment of host macrophages is essential for its virulence. The cold shock protein Csp A plays an important role in the virulence of B. melitensis. To analyze the genes regulated by Csp A, the whole transcriptomes of B. melitensis NI?csp A and its parental wild-type strain, B. melitensis NI, were sequenced and analyzed using the Solexa/Illumina sequencing platform. A total of 446 differentially expressed genes were identified, including 324 up-regulated and 122 down-regulated genes. Numerous genes identified are involved in amino acid, fatty acid, nitrogen, and energy metabolism. Interestingly, all genes involved in the type IV secretion system and Lux R-type regulatory protein Vjb R were significantly down-regulated in NI?csp A. In addition, an effector translocation assay confirmed that the function of T4 SS in NI?csp A is influenced by deletion of the csp A gene. These results revealed the differential phenomena associated with virulence and metabolism in NI?csp A and NI, providing important information for understanding detailed Csp A-regulated interaction networks and Brucella pathogenesis. | Zhen Wang Wenxiao Liu Tonglei Wu Pengfei Bie Qingmin Wu | 2016 | Science China(Life Sciences)2016，59，4： | 3 |
| 16 | Optimal power allocation for cognitive relay networks: amplify-and-forward versus selection relay显示文摘We consider a cognitive relay network which is defined by a source,a destination,and cognitive relay nodes and primary user nodes.In this network,a source is assisted by cognitive relay nodes which allow coexisting with primary user nodes by imposing severe constraints on the transmission power so that they operate below the noise floor of primary user nodes.In this paper,we mainly study the power allocation strategies of this system to minimize the outage probability subject to total and individual power constraints for cognitive relay nodes and subject to interference constraints for primary user nodes.A relay transmission scheme,namely amplify-and-forward (AF),is considered.We first present an optimal power allocation (OPA) scheme to minimize the system outage probability,based on instantaneous channel state information among the source,destination and relay nodes and mean channel gains between primary user nodes and cognitive relays.Next,we propose a selection AF scheme (S-AF) where the single best relay is chosen to assist in the transmission and study power allocation strategy for S-AF to minimize outage probability.The analytical power allocation strategies have been validated through numerical simulations.The results indicate that the AF with OPA and S-AF with OPA have significantly better outage behavior and average throughput than AF and S-AF schemes respectively.We also find that S-AF with OPA achieves a higher throughput,and hence lower outage probability than AF with OPA. | YUE WenJing ZHENG BaoYu MENG QingMin YUE WenJie CUI JingWu | 2011 | Science China(Information Sciences)2011，54，4： | 3 |
| 17 | COMBINED TRANSMIT ANTENNA SELECTION AND DETECTION OVER SPATIAL CORRELATED MIMO SYSTEMS显示文摘In this paper a method that combines transmit antenna selection and reduced-constellation detection in spatially correlated Multi-Input Multi-Output (MIMO) fading channels is presented. To mitigate the performance degradation caused by the use of antenna selection that is based on correlation among columns, an iterative receiver scheme that uses only a subset of the constellation points close to the expected symbol value estimated in the previous iteration is proposed. The size of the subset can adapt to the maximum correlation of the sub-matrix after the simple antenna selection. Furthermore, the error rate performance of the scheme under linear Minimum Mean Square Error (MMSE) or Ordered Successive Interference Cancellation (OSIC) for the first run detection and different interleaver lengths is investigated while the transmit antenna selection is considered. The simulation results show a sig- nificant advantage both for implementation complexity and for error rate performance under a fixed data rate. | Meng Qingmin Hua Jingyu You Xiaohu Zhuang Xiangyang | 2007 | Journal of Electronics(China)2007，24，6： | 2 |
| 18 | Competition Mechanism of Lightning Upward Leaders Issued from UHVDC Transmission Lines显示文摘 | SHI Wei LI Qingmin LU Xinchang ZOU Liang SUN Qiuqin | 2012 | 高电压技术2012，38，12： | 2 |
| 19 | Design, Synthesis and Herbicidal Activities of Tetrahydroisoindoline-1,3-dione Derivatives Containing Alkoxycarbonyl Substituted 2-Benzoxazolinone显示文摘几不同代替 alkoxycarbonyl 的 2-benzoxazolinone 一半被合并了到 tetrahydroisoindoline-1,3-dione 脚手架提供 25 混合物(1a-1u 和 2a-2d ) 。这些混合物的结构被 1 H 和 13 C NMR, HRMS 和 X 光检查单个水晶的衍射。一些这些混合物(1g, 1h, 1j, 1k ) 对以 375 g AI·ha −1 的率的青麻 theophrasti, Amaranthus retroflexus 和 Echinochloa crus-galli 的展出优秀 herbicidal 活动。在他们之中,混合物 1h 和 1j 分别地与 1.8 和 5.3 g AI·ha −1, 的编辑 50 价值对青麻 theophrasti 显示了最好的出现以后的 herbicidal 效果,它比商业 acifluorfen 的优异(44.3 g AI·ha −1) 。地试用证明复合 1h 展出了类似的 herbicidal 活动到高集中 atrazine,并且发现了比 atrazine 为玉米更安全。这研究的结果因此证明复合 1h 能潜在地为玉米领域被用作出现以后的除草剂。 | Hao Zhang Kechang Liu Ruiquan Liu Qibo Li Yongqiang Li Qingmin Wang Shangzhong Liu | 2015 | Chinese Journal of Chemistry2015，33，7： | 2 |
| 20 | ANALYSIS OF FLUID FIELD OF LIQUID METAL IN ELECTROMAGNETIC CENTRIFUGAL CASTING显示文摘Navier-Stokes equation and Lorentz force equation are used to calculate the fluid field of liquid metal of electromagnetic centrifugal casting(EMCC) in this paper.A field equationis given,which shows the azimuthal velocity closely relates to electrical conductivity,mag-netic density,viscosity of liquid metal and radius of casting.The results show that the sta-tionary magentic field can effectively restrain the fluid flow and the relative velocity be-tween liquid metal and casting mould and the velocity gradient at solid/liquid interface in-creases with rising magnetic density,which has a great effect on the solidification of liquidmetal and crystal growth characteristies. | JIAO Yuning, LIU Qingmin, YANG Yuangsheng, HU Zhuangqi,Institute of Meta] Research, Chinese Academy of Sciences, Shenyang, ChinaGAO Yunyan, JIA Guanglin, ZHANG Guozhi, QIAO YuanjunNortheast University, Shenyang, China Manuscript received 12 May, 1994 | 1994 | Acta Metallurgica Sinica(English Letters)1994，7，2： | 2 |
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