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| 1 | Extreme learning machines: new trends and applications显示文摘Extreme learning machine(ELM), as a new learning framework, draws increasing attractions in the areas of large-scale computing, high-speed signal processing, artificial intelligence, and so on. ELM aims to break the barriers between the conventional artificial learning techniques and biological learning mechanism and represents a suite of machine learning techniques in which hidden neurons need not to be tuned. ELM theories and algorithms argue that 'random hidden neurons' capture the essence of some brain learning mechanisms as well as the intuitive sense that the efficiency of brain learning need not rely on computing power of neurons.Thus, compared with traditional neural networks and support vector machine, ELM offers significant advantages such as fast learning speed, ease of implementation, and minimal human intervention. Due to its remarkable generalization performance and implementation efficiency, ELM has been applied in various applications. In this paper, we first provide an overview of newly derived ELM theories and approaches. On the other hand,with the ongoing development of multilayer feature representation, some new trends on ELM-based hierarchical learning are discussed. Moreover, we also present several interesting ELM applications to showcase the practical advances on this subject. | DENG ChenWei HUANG GuangBin XU Jia TANG JieXiong | 2015 | Science China(Information Sciences)2015，58，2： | 50 |
| 2 | Effect of NH_4^+-N/NO_3^--N Ratios on Growth and Some Physiological Parameters of Chinese Cabbage Cultivars显示文摘The responses of three cultivars of Chinese cabbage (Brassica chmensis L.), one of the main vegetable crops in China, to different ratios of NH4+-N/NO3--N was investigated to find the optimal ratio of ammonium to nitrate for maximal growth and to explore ways of decreasing the nitrate content, increasing nitrogen use efficiency of Chinese cabbage, and determining distributions of nitrogen and carbon. Three cultivars of Chinese cabbage were hydroponically grown with three different NH4+-N/NO3--N ratios (0:100, 25:75 and 50:50). The optimal ratio of NH4+-N/NO3- -N for maximal growth of Chinese cabbage was 25:75. The increase in the ratio of NH4+-N/NO3--N significantly decreased nitrate content in various tissues of Chinese cabbage in the order of petiole > leaf blade > root. The highest total nitrogen (N) content was found when the ratio of NH4+-N/NO3--N was 25:75, and N contents in plant tissues were significantly different, mostly being in the order of leaf blade > petiole > root. At the NH4+-N/NO4+-N ratio of 25:75, the biomasses of Chinese cabbage cultivars ’Shanghaiqing’, ’Liangbaiye 1’ and ’Kangre 605’ increased by 47%, 14% and 27%, respectively. The biomass, SPAD chlorophyll meter readings and carbon content of ’Shanghaiqing’ were all higher than those of ’Liangbaiye 1’, while nitrate and total nitrogen contents were lower. Thus, partial replacement of nitrate by ammonium could improve vegetable production by both increasing yields and decreasing nitrate content of the plants. | CHENWei LUOJin-Kui SHENQi-Rong | 2005 | Pedosphere2005，15，3： | 33 |
| 3 | An improved analytical model of cutting temperature in orthogonal cutting of Ti6Al4V显示文摘Cutting heat has significant effects on the machined surface integrity of titanium alloys in the aerospace field. Many unwanted problems such as surface burning, work hardening, and tool wear can be induced by high cutting temperatures. Therefore, it is necessary to accurately predict the cutting temperature of titanium alloys. In this paper, an improved analytical model of the cutting temperature in orthogonal cutting of titanium alloys is proposed based on the Komanduri-Hou model and the Huang-Liang model. The temperatures at points in a cutting tool, chip, and workpiece are calculated by using the moving heat source method. The tool relief angle is introduced into the proposed model, and imaginary mirrored heat sources of the shear plane heat source and the frictional heat source are applied to calculate the temperature rise in a semi-infinite medium. The heat partition ratio along the tool-chip interface is determined by the discretization method. For validation purpose, orthogonal cutting of titanium alloy Ti6Al4V is performed on a lathe by using a sharp tool. Experimental results show to be consistent well with those of the proposed model,yielding a relative difference of predicted temperature from 0.49% to 9.00%. The model demonstrates its ability of predicting cutting temperature in orthogonal cutting of Ti6Al4V. | Chenwei SHAN Xu ZHANG Bin SHEN Dinghua ZHANG | 2019 | Chinese Journal of Aeronautics2019，32，3： | 10 |
| 4 | Prediction on grinding force during grinding powder metallurgy nickel-based superalloy FGH96 with electroplated CBN abrasive wheel显示文摘In this article,a grinding force model,which is on the basis of cutting process of single abrasive grains combined with the method of theoretical derivation and empirical formula by analyzing the formation mechanism of grinding force,was established.Three key factors have been taken into accounts in this model,such as the contact friction force between abrasive grains and materials,the plastic deformation of material in the process of abrasive plowing,and the shear strain effect of material during the process of cutting chips formation.The model was finally validated by the orthogonal grinding experiment of powder metallurgy nickel-based superalloy FGH96 by using the electroplated CBN abrasive wheel.Grinding force values of prediction and experiment were in good consistency.The errors of tangential grinding force and normal grinding force were 9.8%and 13.6%,respectively.The contributions of sliding force,plowing force and chip formation force were also analyzed.In addition,the tangential forces of sliding,plowing and chip formation are 14%,19%and 11%of the normal forces on average,respectively.The pro-posed grinding forcemodel is not only in favor of optimizing the grinding parameters and improving grinding efficiency,but also contributes to study some other grinding subjects(e.g.abrasive wheel wear,grinding heat,residual stress). | Benkai LI Chenwei DAI Wenfeng DING Changyong YANG Changhe LI Olga KULIK Vyacheslav SHUMYACHER | 2021 | Chinese Journal of Aeronautics2021，34，8： | 10 |
| 5 | Dynamic monitoring of soil bulk density and infiltration rate during coal mining in sandy land with different vegetation显示文摘To investigate the effects of coal mining on soil physical properties,sandy lands with three major vegetation types(Salix psammophila,Populus simonii,and Artemisia ordosica)were investigated by the ring knife method and double-ring infiltrometer.Specifically,variations in soil bulk density and water infiltration rate and the influences of coal mining and vegetation type on the properties during different subsidence stages were studied at the Shendong Bulianta mine.The results showed that,in the period before mining,soil bulk density occurred in the order A.ordosica>P.simonii>S.psammophila,with a negative correlation between the initial infiltration rate and steady infiltration rate being observed.In the period during mining and 3 months after mining,there were no significant differences in soil bulk density and water infiltration rate among vegetation types.At 1 year after mining,the soil bulk density occurred in the order A.ordosica>S.psammophila>P.simonii,having a negative correlation with the steady infiltration rate.The water infiltration depths of the S.psammophila,P.simonii and A.ordosica were 50,60,and 30 cm,respectively.The infiltration characters were simulated by the Kostiakov equations,and the simulated and experimental results were consistent.Linear regression revealed that vegetation types and soil bulk density had significant effects on soil initial infiltration rate during the four study periods,and the infiltration rate of the period 1 year after mining was mainly influenced by the soil bulk density of the period before mining.The results indicated that vegetation types had significant effects on soil bulk density,and that the tree-shrub-grass mode was better than one single plantation for water conversation and vegetation recovery in sandy land subjected to mining. | Yinli Bi Hui Zou Chenwei Zhu | 2014 | International Journal of Coal Science & Technology2014，1，2： | 9 |
| 6 | VO2·0.2H2O nanocuboids anchored onto graphene sheets as the cathode material for ultrahigh capacity aqueous zinc ion batteries显示文摘Aqueous Zinc-ion batteries(ZIBs),using zinc negative electrode and aqueous electrolyte,have attracted great attention in energy storage field due to the reliable safety and low-cost.A composite material comprised of VO2·0.2H2O nanocuboids anchored on graphene sheets(VOG)is synthesized through a facile and efficient microwave-assisted solvothermal strategy and is used as aqueous ZIBs cathode material.Owing to the synergistic effects between the high conductivity of graphene sheets and the desirable structural features of VO2·0.2H2O nanocuboids,the VOG electrode has excellent electronic and ionic transport ability,resulting in superior Zn ions storage performance.The Zn/VOG system delivers ultrahigh specific capacity of 423 mAh·g^−1 at 0.25 A·g^−1 and exhibits good cycling stability of up to 1,000 cycles at 8 A·g^−1 with 87%capacity retention.Systematical structural and elemental characterizations confirm that the interlayer space of VO2·0.2H2O nanocuboids can adapt to the reversible Zn ions insertion/extraction.The as-prepared VOG composite is a promising cathode material with remarkable electrochemical performance for low-cost and safe aqueous rechargeable ZIBs. | Dedong Jia Kun Zheng Ming Song Hua Tan Aitang Zhang Lihua Wang Lijun Yue Da Li Chenwei Li Jingquan Liu | 2020 | Nano Research2020，13，1： | 6 |
| 7 | Co3O4 modified Ag/g-C3N4 composite as a bifunctional cathode for lithium-oxygen battery显示文摘Rechargeable lithium-oxygen(Li-O2)batteries have appeal to enormous attention because they demonstrate higher energy density than the state-of-the-art Li-ion batteries.Whereas,their practical application is impeded by several challenging problems,such as the low energy round trip efficiencies and the insufficient cycle life,due to the cathode passivation caused by the accumulation of discharge products.Developing efficient catalyst for oxygen reduction and evolution reactions is effective to reduce the overpotentials in Li-O2cells.In our work,we report a Co3O4modified Ag/g-C3N4nanocomposite as a bifunctional cathode catalyst for Li-O2cells.The g-C3N4substrate prevents the accumulation of Ag and Co3O4nanoparticles and the presence of Ag NPs improves the surface area of g-C3N4and electronic conductivity,significantly improving the oxygen reduction/evolution capabilities of Co3O4.Due to a synergetic effect,the Ag/g-C3N4/Co3O4nanocomposite demonstrates a higher catalytic activity than each individual constituent of Co3O4or Ag/g-C3N4for the ORR/OER on as catalysts in Li-O2cells.As a result,the Ag/gC3N4/Co3O4composite shows impressive electrochemical performance in a Li-O2battery,including high discharge capacity,small gap between charge and discharge potential,and high cycling stability. | Qi Guo Chenwei Zhang Chaofeng Zhang Sen Xin Pengchao Zhang Qiufan Shi Dawei Zhang Ya You | 2020 | Journal of Energy Chemistry2020，29，2： | 4 |
| 8 | Image Quality Evaluation Method Based on Human Visual System显示文摘 | ZHAO Bao DENG Chenwei | 2010 | Chinese Journal of Electronics2010，19，1： | 4 |
| 9 | Effect of 1,2,4-triazole on galvanic corrosion between cobalt and copper in CMP based alkaline slurry显示文摘Cobalt has become a new type of barrier material with its unique advantages since the copper-interconnects in the great-large scale integrated circuits(GLSI)into 10 nm and below technical nodes,but cobalt and copper have severe galvanic corrosion during chemical–mechanical flattening.The effect of 1,2,4-triazole on Co/Cu galvanic corrosion in alkaline slurry and the control of rate selectivity of copper and cobalt were investigated in this work.The results of electrochemical experiments and polishing experiments had indicated that a certain concentration of 1,2,4-triazole could form a layer of insoluble and dense passive film on the surface of cobalt and copper,which reduced the corrosion potential difference between cobalt and copper.Meantime,the removal rate of cobalt and copper could be effectively controlled according to demand during the CMP process.When the study optimized slurry was composed of 0.5 wt%colloidal silica,0.1%vol.hydrogen peroxide,0.05 wt%FA/O,345 ppm1,2,4-triazole,cobalt had higher corrosion potential than copper and the galvanic corrosion could be reduced effectively when the corrosion potential difference between them decreased to 1 mV and the galvanic corrosion current density reached 0.02 nMeanwhile,the removal rate of Co was 62.396 nm/min,the removal rate of Cu was 47.328 nm/min,so that the removal rate ratio of cobalt and copper was 1.32:1,which was a good amendment to the dishing pits.The contact potential corrosion of Co/Cu was very weak,which could be better for meeting the requirements of the barrier CMP. | Lei Fu Yuling Liu Chenwei Wang Linan Han | 2018 | Journal of Semiconductors2018，39，4： | 4 |
| 10 | Comparative study of carbonic anhydrase activity in waters among different geological eco-environments of Yangtze River basin and its ecological significance显示文摘This study provides the presence of carbonic anhydrase(CA) activity in waters of the Yangtze River basin, China, as well as the correlation of CA activity with HCO-3 concentration and CO_2 sink flux. Different degrees of CA activity could be detected in almost all of the water samples from different geological eco-environments in all four seasons. The CA activity of water samples from karst areas was significantly higher than from non-karst areas(PP3-concentration(r = 0.672, P2 sink flux(r = 0.602, P = 0.076) in karst areas. This suggests that CA in waters might have a promoting effect on carbon sinks for atmospheric CO_2 in karst river basins. In conditions of similar geological type, higher CA activity was generally detected in water samples taken from areas that exhibited better eco-environments, implying that the CA activity index of waters could be used as an indicator for monitoring ecological environments and protection of river basins. These findings suggest that the role of CA in waters in the karst carbon sink potential of river basins is worthy of further in-depth studies. | Sila Onesmus Nzung'a Weizhi Pan Taiming Shen Wei Li Xiaoqun Qin Chenwei Wang Liankai Zhang Longjiang Yu | 2018 | Journal of Environmental Sciences2018，30，4： | 3 |
| 11 | Investigation on surface roughness,residual stress and fatigue property of milling in-situ TiB_2/7050Al metal matrix composites显示文摘For higher efficiency and precision manufacturing,more and more attentions are focused on the surface roughness and residual stress of machined parts to obtain a good fatigue life.At present,the in-situ TiB_2/7050 Al metal matrix composites are widely researched due to its attractive properties such as low density,good wear resistance and improved strength.It is of great significance to investigate the machined surface roughness,residual stress and fatigue life for higher efficiency and precision manufacturing of this new kind material.In this study,the surface roughness including two-dimensional and three-dimensional roughness,residual stress and fatigue life of milling in-situ TiB_2/7050 Al metal matrix composites were analyzed.It was found from comparative investigation that the three-dimensional surface roughness would be more appropriate to represent the machined surface profile of milling particle reinforced metal matrix composites.The cutting temperature played a great role on the residual stress.However,the effect of increasing cutting force could slow down the transformation from compressive stress to tensile stress under 270°C.An exponential relationship between three-dimensional roughness and fatigue life was established and the main fracture mechanism was brittle fracture with observation of obvious shellfish veins,river pattern veins and wave shaped veins in fracture surface. | Yifeng XIONG Wenhu WANG Yaoyao SHI Ruisong JIANG Chenwei SHAN Xiaofen LIU Kunyang LIN | 2021 | Chinese Journal of Aeronautics2021，34，4： | 3 |
| 12 | c-Met Is a Marker of Pancreatic Cancer Stem Cells and Therapeutic Target显示文摘 | Chenwei Li Jing–Jiang Wu Mark Hynes Joseph Dosch Bedabrata Sarkar Theodore H. Welling Marina Pasca di Magliano Diane M. Simeone | 2011 | Gastroenterology2011，，6： | 3 |
| 13 | Real-Time Coding Scheme for High-Resolution Remote Sensing Images显示文摘 | DENG Chenwei ZHAO Baojun | 2009 | Chinese Journal of Electronics2009，18，3： | 3 |
| 14 | Building Intrusion Tolerant Software System显示文摘In this paper, we describe and analyze the hypothesis about intrusion tolerance software system,so that it can provide an intended server capability and deal with the impacts caused by the intruder exploiting the inherent security vulnerabilities. We present some intrusion tolerance technology by exploiting N-version module threshold method in constructing multilevel secure software architecture, by detecting with hash value, by placing an “antigen” word next to the return address on the stack that is similar to human immune system, and by adding “Honey code” nonfunctional code to disturb intruder, so that the security and the availability of the software system are ensured. | PENGWen-ling WANGLi-na ZHANGHuan-guo CHENWei | 2005 | Wuhan University Journal of Natural Sciences2005，10，1： | 3 |
| 15 | Controllable self-assembly of parallel gold nanorod clusters by DNA origami显示文摘Herein we demonstrate the construction of three types of parallel gold nanorod(AuNR) clusters using a DNA origami rod(DOR) as the template. Based on the precise control over the position of capture strands on DOR, number and orientation of the AuNR clusters can be well engineered, as evidenced by biological transmission electron microscope(TEM). Importantly, the AuNR clusters exhibit chiroptical responses which are strongly affected by the number of AuNR on rod-like DNA origami. | Hang Yu Tiantian Man Wei Ji Leilei Shi Chenwei Wu Hao Pei Chuan Zhang | 2019 | Chinese Chemical Letters2019，30，1： | 2 |
| 16 | 显示文摘 | ZhangJuan(张娟) WeiWenjuan(魏文娟) ChenWei(陈伟) WuYuanxin(吴元欣) BaiZhengwu(柏正武) | 2010 | 色谱2010，，28： | 2 |
| 17 | Simulation of Moon-based Earth observation optical image processing methods for global change study显示文摘Global change affected by multiple factors,the consequences of which continue to be far-reaching,has the characteristics of large spatial scale and long-time scale.The demand for Earth observation technology has been increasing for large-scale simultaneoiis observations and stable global observation over the long-term.A Moon-based observation platform,which uses sensors on the nearside lunar surface,is considered a reasonable solution.However,owing to a lack of appropriate processing methods for optical sensor data,global change study using this platform is not sufficient.This paper proposes two optical sensor imaging processing methods for the Moon-based platform:area imaging processing method(AIPM)and global imaging processing method(GIPM),primarily considering global change characteristics,optical sensor performance,and motion law of the Moon-based platform.First,the study proposes a simulation theory which includes the construction of a Moon-Sun elevation angle model and a global image mosaicking method.Then,coverage images of both image processing methods are simulated,and their features are quantitatively analyzed.Finally,potential applications are discussed.Results show that AEPM,whose coverage is mainly affected by lunar revolution,is approximately between 0%and 50%with a period of 29.5 days,which can help the study of large-scale instant change phenomena.GIPM,whose coverage is affected by Earth revolution,is conducive to the study of long term global-scale phenomena because of its sustained stable observation from 67°N-67°S on the Earth.AIPM and GIPM have great advantages in Earth observation of tripolar regions.The existence of top of the atmosphere(TOA)albedo balance line is verified from the GIPM perspective.These two imaging methods play a significant role in linking observations acquired from the Moon-based platform to Earth large-scale geoscience phenomena,and thus lay a foundation for using this platform to capture global environmental changes and new discoveries. | Tong LI Huadong GUO Li ZHANG Chenwei NIE Jingjuan LIAO Guang LIU | 2020 | Frontiers of Earth Science2020，14，1： | 2 |
| 18 | The stability of a novel weakly alkaline slurry of copper interconnection CMP for GLSI显示文摘Chemical mechanical polishing(CMP) is one of the important machining procedures of multilayered copper interconnection for GLSI, meanwhile polishing slurry is a critical factor for realizing the high polishing performance such as high planarization efficiency, low surface roughness. The effect of slurry components such as abrasive(colloidal silica), complexing agent(glycine), inhibitor(BTA) and oxidizing agent(H_2O_2) on the stability of the novel weakly alkaline slurry of copper interconnection CMP for GLSI was investigated in this paper. First, the synergistic and competitive relationship of them in a peroxide-based weakly alkaline slurry during the copper CMP process was studied and the stability mechanism was put forward. Then 1 wt% colloidal silica, 2.5 wt% glycine,200 ppm BTA, 20 m L/L H_2O_2 had been selected as the appropriate concentration to prepare copper slurry, and using such slurry the copper blanket wafer was polished. From the variations of copper removal rate, root-mean square roughness(Sq) value with the setting time, it indicates that the working-life of the novel weakly alkaline slurry can reach more than 7 days, which satisfies the requirement of microelectronics further development. | Caihong Yao Chenwei Wang Xinhuan Niu Yan Wang Shengjun Tian Zichao Jiang Yuling Liu | 2018 | Journal of Semiconductors2018，39，2： | 2 |
| 19 | Prediction of cutting forces in ball-end milling of 2.5D C/C composites显示文摘Machining of carbon/carbon(C/C) composite materials is difficult to carry out due to its high specific stiffness,brittleness,anisotropic,non-homogeneous and low thermal conductivity,which can result in tear,burr,poor surface quality and rapid wear of cutters.Accurate and fast prediction of cutting forces is important for milling C/C composite materials with high quality.This paper presents an alternative cutting force model involving the influences of the directions of fiber.Based on the calculated and experimental results,the cutting forces' coefficients of 2.5D C/C composites are evaluated using multiple linear regression method.Verification experiment has been carried out through a group of orthogonal tests.Results indicate that the proposed model is reliable and can be used to predict the cutting forces in ball-end milling of 2.5D C/C composites. | Shan Chenwei Wang Xiao Yang Xuanxuan Lyu Xiaobo | 2016 | Chinese Journal of Aeronautics2016，29，3： | 2 |
| 20 | Bio-inspired Superhydrophobic Coating with Low Hydrate Adhesion for Hydrate Mitigation显示文摘In this paper,we fabricate a biomimetic superhydrophobic coating on an X90 pipeline steel substrate by electrodeposition of copper,hydrothermal treatment to form a copper oxide layer,and subsequent surface modification with Stearic Acid(SA).The coating exhibits static contact angles of water of 160°±-3.1°in the air and 170.7°±2.5°in cyclopentane,indicating the strongly water-repelling nature of the coating.The morphologies of the cyclopentane hydrate formed on steel substrates with and without the superhydrophobic coating are investigated.The results show that the hydrate particle on the coating exhibits spherical morphology and herein the interfacial contact area and adhesion force to the solid surface can be essentially reduced.The adhesion force reduction may be resulted by the decrease in the contact area between the hydrate and the solid surface. | Sanbao Dong Mingzhong Li Chenwei Liu Jie Zhang Gang Chen | 2020 | Journal of Bionic Engineering2020，17，5： | 2 |
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