Mechanics and mechanical engineering: proceedings of the 2015 international conference (MME2015)

Machine generated contents note: Dynamics modeling and simulation of an industrial manipulator subject to constraint --
The influence of gradient foam core on the strain energy density of sandwich panels / Jia Liu / Rong Liu --
An incompressible SPH method for simulating free surface flows of shear-thinning fluids / Deng-Bao Xiao / Gui-Ping Zhao / Jaeung Cho --
Analysis of contact forces of particles with excavator bucket in digging process by using discrete element method / Xiao-Yang Xu / Fang-An Deng --
Predicting the resistance of a high-speed vessel with consideration of hull attitude / Zi-Qiang Fang / Guo-Ming Hu / Wen-Jie Gui / Yong Liu --
Effects of lateral width on the performance of counter-flow vectoring nozzle in subsonic conditions / Yu-Cheng Wang --
Effects of geometric parameters on the reflux ratio of a recycle micromixer / Xiang Wang / Zhao-Miao Liu --
A study of bubble drag coefficient in water / Fu-Wang Zhao / Zhao-Miao Liu Note continued: Effects of time delay and noise on asymptotic stability in the double inverted pendulum for human quiet standing / Ling-Jun Xu / Gang Chen --
Mechanical behavior of fracturing string in super deep exploratory well in Tahe oilfield / Cai-Hong Wang / Jian Xu --
Experimental research on nonlinear dynamic characteristics of multi-layer corrugated steel plate isolator / Xin-Yong Wei / Yong Zhu / Lin-Tao Li / Wu Long / Xiao-Yong Wan / Bao-Kui Gao --
Research on contact constraints linearization of dexterous hand and grasping forces optimization / Hui Yan / Lu Zhang / Hong-Yuan Jiang / Kai Li / Guang-Hao Dai --
Research of \"Electric-Vibration-Force\" mixed modeling for TRUM / Peng Jia / Li-Quan Wang / Wei-Li Li / Shi-Qing Guo / Bo-Wen Wu --
Dynamic analysis of pavement and multi-layered transversely isotropic saturated ground system subjected to a rectangular moving load / Kai Jing / He-Xu Sun / Yan Dong / Guo-Qing Li Note continued: Study of parallel compressor model for unequal pressure distribution in outlets / Yong-Xiang Zhan / Hai-Lin Yao / Jing-Bo Zhang / Wan-Ping Wu --
A follow-up study of type-B aortic dissection after endovascular repair: A computational fluid dynamics study / Ke-Wei Xu / Jens Friedrich / Kevin Dwinger / Wei Fan / Xi-Jin Zhang --
A fast quantum dynamics algorithm for dissipative systems / Huan-Ming Xu / Qi Tang / Jie Yi / Duan-Duan Chen / Jiang Xiong --
Use of wearable sensors for studying kinematics and dynamics of aged people\'s gait / Zhao Chen / She-Sheng Zhang / Yu-Guang Li --
Experimental study of solid-liquid flow during sand extraction / Yu-Chuan Wu / Li Zhu / Feng Hu / Wei-Ping Luo --
Contrast of two computing methods of unsteady aerodynamics in wing flutter analysis / Ji-Fei Yu / Hong Gao / Xiao-Qiu Wang / Zhi-Li Fan / Zhi-Ming Wang --
Dynamic characteristic analysis of a dual-rotor system with rub-impact / Yan-Ping Xiao / Zhi-Qiang Liu Note continued: A concise analysis method for ultimate strength of stiffened composite structure with post-buckling behavior considered / Yang Yang / Yi-Long Wang / Deng-Qing Cao --
Research on pile-soil-structure dynamic interaction of large span cable-stayed bridge by using lumped mass model / Guo-Fan Zhang / Xia-Sheng Sun / Zhong-Lei Sun --
Initiation life prediction of TBM cutterhead based on multi-body system dynamics / Huai-Sheng Ruan / You-Di He / Wei Wang --
Torsional vibration analysis of high-speed reciprocating compressor crankshaft / Nan Hou / Kui Chen / Dong Zhu / Jing-Xiu Ling / Jian-Jun Zhou / Jun-Zhou Huo --
Study on the impact of water depth on dynamic characteristics of bridge / Guang-Yu Mu / Feng Wang / Xiao-Zhen Mi / Li-Ping Yao --
Kinematic analysis of the elite javelin thrower Liu Shiying\'s final exertion technique / Jing-Nan Yang / Xiong-Jun He / Jie Liu Note continued: Wake structure analysis of wind turbines based on a free vortex wake model / Ke Dong / Lan-Jing Xiong / Ji-He Zhou --
Optimal vibration suppression for series space capture structure with multistage damping / Bo-Feng Xu / Li Chen / Zhen-Zhou Zhao / Yue Yuan / Tong-Guang Wang --
Structural health monitoring and safety evaluation of port crane / Jie Jia / Ming Chu / Qing-Xuan Jia / Zhi-Guo Wang --
Study on measurement method and transmission characteristics of infrasound / Jie Zhong / Kai Huang / Hui Jin / Xiang-Dong Li / Jian-Qin Xu / Zhi-Bing Zhang / Yi-Hui Zhang --
The technology of dynamic- workflow control based on DSM / Bin Wang --
Research on crushing effectiveness of a new type of plastic crusher / Rui-Cheng Fan / Ai-Min Wang / Zhi-Bing Lu --
Tool monitoring system development for NC machining of complex parts integrating process information and spindle power signal / Xiao-Mei Shen / Su-Xiang Qian / Zhi-Heng Yu Note continued: Development of parametric design system for main parts of tension pay-off equipment / Shao-Wei Zhu --
Analysis of fractal characteristics of cutting force signal in side milling of ceramic / Wei-Hua Cui / Cao Fu / Xia Zhao / Ke-Qiang Gong --
Numerical prediction of dynamic stability derivatives for a solar electric powered UAV / Hai-Bing Wu / Jiang-Dong Cai / Qian-Liang Chen / Cai-Bao Liu --
Analysis on sensitive frequency of fixed-point loading for track loading vehicle / Jian Guan / Zheng Guo --
High-precision SCNS/SINS integrated navigation method for shipboard / Xiao-Pei Cai / Ning Zhao / Chuang-Chuang Ren / Pu Wang --
Study on the key parameters affecting test results in toy LED radiation tests / Ling-Feng Zhou / Wang-Yang Zhao / Xiao-Ming Zhao / Yuan-Jin Qu / Song-Pu Yang --
Chinese modular system for road freight transport [—] development and suggestions / Cheng-Bo Liang / Hai-Bo Zhou / Yan-Yan Suo / Jia-Peng Zhou Note continued: Inverse kinematics solution for onboard craning manipulator based on EMPSO / Bin Duan / Ying-Chun Shan / fin-Song Dong / Chuan-Jin Ou / Hong-Wei Zhang --
Influence of bulk temperature field on heavy-load gears / Zhi-Guo Tang / Yan-Feng Qiao / Yuan-Chun Li --
Modeling the deformation of steam pipes of the boiler based on digital image correlation method / Yan-Qin Zhang / Xin-Yang Qiu / Ming-Shuang Li / Jin-Lei Zhang --
Inventor-based simulation analysis for NC tube bending process / Wei Wang / Bin Gan / Jie-Dong Lin / Wan-Li Zhong / Wen-Sheng Li / Shao-Sheng Fan --
1D simulation and bench testing study on economic performance of biodiesel engine / Bing-Qian Liu / Yong Chen / Chao Xie / Lei Shi --
Finite element analysis on an ash hopper from an electrostatic precipitator / Zhao-Ming Huang --
Intelligent analysis of equipment performance degradation using neural network / Lu-Yu Huang / Yang Gao / He Zhang Note continued: Construction of knowledge-base for fault diagnosis expert system of reciprocating compressors / Feng Hu / Chuan-Tong Wang / Lian-Qing Yu / Yu-Chuan Wu / Ling-Xue Kong --
Investigation of blade tip of axial rotor with part-span forward skew / Ya-Jin Liu / Qi Song --
The development of new drop hole sounding equipment / Yang Li --
Analysis of wellhead growth in deep wells in west China / Yan-Ru Yang --
Selection of sealing facilities for top-mounted filling pipes using multi-attribute decision making / Jing-Wei Ren / Bao-Kui Gao / Qiao Deng --
Mesh generation of engine combustion chamber based on KIVA-3V / Cheng-Wen Liu / Yan-Feng Wang / An-Hua Peng / Pu-Kuan Chen / Jin Qian --
Research and development of shellfish seafood processing production line based on fuzzy control / Yan Shi / Yong-Feng Liu / Zi-Hao Qiu --
Method of seven-axis Linkage CNC abrasive belt grinding of aero-engine blade / Qiang Chen / Xue-Heng Tao / Jin-Shi Lu / Xue-Jun Wang Note continued: Effect of variable moment of inertia on torsional vibration of a crankshaft-absorber system / Ming-De Zhang / Le Xie / Wei-Qing Zhang --
Research and development on cutting device for separation of maize root stubble from soil / Yi Huang / Wei Wang / Jian-Xin Han / Chen Wang --
Technological research on full-channel distribution of Chinese traditional medicine honey pills / Dong-Wei Shao / Dong-Hua Jiang / Gui-Fu Wu / Ji-Yi Luan / Jun-Fa Wang / Yuan-Jun Liu / Qi-Sheng Liu / Zhi-Gang Weng / Zheng-Kun Tang / Chang-You Ma / Ming-Chang Li --
Evaluation method for friction torque life and reliability of satellite momentum wheel bearings / Dong-Hua Jiang / Dong-Wei Shao / Xiang-Dong Liu / Qie Pan / Ze-Ming Long / Lei Xing --
The liquid bridge in atomic force microscopy / Xin-Tao Xia / Zhen Chang / Yun-Fei Li / Liang Ye / Bin Liu --
Analysis of crankshaft crack of ductile iron / Yan Sun / Wen-Xuan Ding / Zai-Ran Wang / Zheng Wei Note continued: A neural network modeling method using fsRNA-GA for 2-dimensional overhead crane / Jing-Long Fan / Xi-Wei Lyu --
The Analysis of the cooperative work of upper and supporting structure / Li-Fan Hao / Ning Wang --
Research on motion reduction of wave-piercing catamaran with automatic control flap and T-foil / Jian-Hua Cui / Wen-Ya Ma --
Extension of quartic Said-Ball curve with two parameters / Yao Zhang / Kai-Wang / Guo-Xiang Hou / Shuai Yang / Sheng Xu / Shi-Hua Xu --
On the roles of passive flexibility in a hovering flapping wing / Cheng-Wei Wang / Hui Chen --
Longitudinal vibration isolation of marine shafting under different supporting forms of thrust bearing / Chao Wang / Chao-Ying Zhou / Qi Yao / Rui Zhang --
Problems facing the development of the electric vehicle industry in China and their countermeasures / Jiang-Yang He / Lin He / Wei Xu / Zheng-Min Li / Han-Guo Cui Note continued: An Intelligent method of planar contour special machining based on visual guiding / Fang-Fang Cai / Fu-Zhou Zhao --
Influence of velocity on friction characteristics of meshing tooth surfaces in harmonic drive gear / Bin-Quan Zhang / Liang Luo / Sun-An Wang --
Modeling of electromechanical actuators with planetary roller screws / Xian Zhang / Ge-Dong Jiang / Chuang Zou / Peng-Fei Zeng / Cheng-Xuan Xie --
Bimetallic hammer for supporting stalk crushers / Kai Li / Pei-Qing Ye / Xiao-Yao Zhou / Qiang Xu --
A benchmark study on the finite element analysis of two interacting circular holes / Liu Hui / Shou-Fan Rong / Yan-He Wu / Peng-Hui Yang / Xiu-Lan Duan / Xing-Ming Zhao --
Multi-objective size optimization design for bus body frame structure based on relative sensitivity analysis / Xiao-Qing Jin / Zhao-Duo Zhang / Fei-Fei Niu / Yu-Mei Hu Note continued: Development situation of 3D printing-based metal manufacturing technology / Deng-Feng Wang / Yan-Yan Niu / Ai-Hua Mao / Xiao-Guang Wu / Jian-Hua Wei / Xue-Chao Shi --
Study on assembly task planning of multi-material car body-in-white based on complexity analysis / Cheng-Long Wu / Yang Chen / Xian-Shuai Chen / Chun-Yu Zhang / Jian-Yu Chen / Xue-Tong Sun --
Study on evolution of civil-military integration industrial cluster based on innovation network theory / Yan-Ping Li --
An anti-frosting blackbody cavity below 0°C / Xiao-Chuan Guo / Xiang Li / Xin Gu --
Emission intensity of composite material sabot after material deletion using ABAQUS / Shu-Guang Wu / Chen Zhong / Min Zheng / Jie Ding / Luo-Feng Fang / Wei Cui --
Research and improvement on the factors causing performance instability of steel axle billets / Cong-Ke Wang / Gang Chen / Dong-Xiang Lu / Kun Zhong / Yong Wu Note continued: A new wafer pre-alignment method in MEMS thermopile detector wafer level test system / Li-Hua Yang --
Microstructure of hot-dipped aluminide stainless steel with various silicon contents / Tao Pan / Zhen-Yu Wang / Yu-Xin Ye / Yan-Mei Kong / Bin-Bin Jiao --
Simulation of crack propagation for non-uniform welded joint / Jin Lou / Cheng-Xiang Ruan / Zuo Yi --
Multiaxial fatigue life prediction of rubber materials using cracking energy density / Ling Xu / Chang-Qing Sun / Xiao-Wei Yin / Jin-Tao Liu / Chen Zhang / Shuang Zhu --
Experimental and numerical analysis of composite sandwich panel / Xiao-Li Wang / Chun-Yu Kong / Xiang-Kun Zeng --
Study on compound materials for formation of an airplane section / Zhi-Dong Guan / Jun Guo / Cheng Qiu --
A patient-specific model of osteonecrosis of the femoral head: a comparison between bulk material setting and HU-value based material setting / Ping He Note continued: The thermal-vibration coupling nonlinear fatigue life prediction of the space shuttle antenna / Huan-Ming Xu / Zhao-Tong Zhang / Duan-Duan Chen / Hai-Jun He / Qi Tang / Wei-Heng Chen --
Deformation simulation of micro-defects inside a metallic alloy / Yue-Xuan Ma / Shao-Ping Wang / Chao Zhang --
Experimental study on impact crushing separation for gangue from raw coal underground / Xian-Zheng Lu / Luen-Chow Chan / Kai-Ming Yu / Wu-Man Sing --
Experimental investigation for friction torque life and reliability of rolling bearings / Chen-Xu Luo / Yu Liu / Jia-Wei Zhou --
Analysis on seismic performance of rigid and semi-rigid steel frame joints / Xin-Tao Xia / Yun-Fei Li / Zhen Chang / Wen-Huan Zhu --
Application review of dielectric electroactive polymers (DEAPs) in phononic crystals / Ke-Wei Ding / Ying-Ying Bao --
S-N curve characteristics and ultrahigh cycle fatigue behavior of high strength spring steel 50CrVA / Xing-Qian Zhao / Chang-Geng Shuai Note continued: Effects of cutting parameters on surface roughness of interpenetrating network composite / Meng-Jiao Zhou / Hong Wang / Ben Wang --
Temperature optimization based on genetic algorithm for gas protection brazing furnaces / Ning Fan / Yang Bai / Pei-Quan Guo / Yong-Zhi Pan --
Investigation of the effect of process parameters in laser cladding for rapid additive prototyping / De-Xing Zheng / Zheng-Gang Wang / Hai Zhou --
Wear and Corrosion of TiBCN coatings by cathodic arc deposition / Sheng-Feng Lu / Yu-Chuan Wu / Shun-Qi Mei --
Modeling of fatigue propagation under random overloads / Wei-Yu Ho / Chen-An Lin / Chien-Liang Lin / Woei-Yun Ho --
Parametric estimate of accelerated life testing of welded joints based on Weibull failure distribution / Xiao-Li Zou --
A space walking robot and its ground simulator / Shu-Xiang Zhang / Yao-Hui Lu / Zhen Feng / Peng-Lin Xiang Note continued: Simulation analysis of factors influencing rate of brake drum temperature increase / Gang-Feng Liu / Chang-Le Li / Jie Zhao / Li-Yi Li --
Study on turbocharger control and efficiency calculation for vehicle engines / Cheng Wang / Xing-Hu Li / Chen Li --
Design of automatic machine for paving mosaic patterns / Qi Zeng --
Hybrid algorithm for multi objective optimization problem / Xing-Bo Wang / Qi-Rong Luo / He Ye / Biao Lu --
Kinematic simulation of modular robot based on particle swarm optimization / Ling Qin --
Research on pumping energy saving control strategy / Jian-Bo Yang / Shao-Ping Wang / Yue-Xuan Ma / Xiao-Yu Cui --
Algorithm of boundary condition problem based on initial condition problem and application / Li-Wen Cao / Han-Jing Wang / Xiang-Zhe Liu --
Nonlinear friction modeling for Modular robot joints / Zhao Chen / She-Sheng Zhang / Hua-Ling Zhao Note continued: Modeling and intelligent synchronous control for parallel-connected motor-gear driving system of TBM cutterhead / Ying-Wen Tang / Han-Xu Sun / Xiao Li / Jing-Zhou Song --
Analysis and test of high performance rotors for quad-rotor UAVs / Tong Liu / Guo-Fang Gong / Zuo Peng / Wei-Qiang Wu --
An energy-saving control system for pumping unit based on the SRM / Shi-Ming Liu / Zi-Xuan Yang --
Analysis of automotive ABS connector production line improvement based on lean six sigma / Shi-Jun Ji / Hong Gao / Ji Zhao / Zhao-Jun Yang / Ji-Xin Wang / Xing-Tian Qu / Yong-Hai Yang --
Investigation of influence of twin-bulbous-bow on DTMB5415\'s navigation performance / Yan Zhou / Guo-Fang Zhang / Jun Zhou / Wei Guo --
Swing control analysis of grab ship unloader based on virtual prototyping / Jian Cao / Hui Wang / Lei Zhang / Ji-Qiang Cai --
Design of social robots based on emotion recognition of multiple-source fusion / Chao Meng / Yong Zhou / Yu Li / Xiao-Hua Cao Note continued: Study on automotive software testing based on electronic control system of SCR / Teng-Yu Zhang / Jing-Sha Zhang / Xin-Ying Shan --
TRIZ analysis of low-voltage circuit breaker failure / Meng-Di Liang / Tao Qiu / Zhen-Shan Bao / Wen-Bo Zhang --
Flexible charging power supply of pulse capacitors / Yan Zhang / Wei Li / Guo-Yuan Zhang --
The design of pin straightening machine for abnormal electronic components / Wei-Jun Zheng / Xiao-Ning Liu --
Design of the Gauss filter in fractional fourier transform domain / Yu-Hang Zheng / Guo-Dong Sun / He-Zheng Mei --
Applications of Noether symmetry approach in electronic circuit analysis / Li-Qun Lei / Zhong-Ren Wang --
Optimal unit commitment of the power system with the maximum utilization of wind power / Yu Xie / Jing-Li Fu / Ben-Yong Chen --
Rut detection model with two line lasers and error correcting technology / Xiao-Bing Shen / You-Kuo Lin / Zing Wang / Hong-Shan Zhao Note continued: Random vibration analysis for a drawer structure with multi-layer printed circuit boards / Xiao-Hui Ju / Li Bian / Ling Xu --
The effect of longitudinal magnetic field on polarization spectrum of closed atomic transitions / Yi-Long Wang / Deng-Qing Cao / Jing Li / Yang Yang --
Research on the voltage of distribution network with the integration of distributed photovoltaic generation / Jun-Hai Zhang / Qi Zhen / Wei-Min Sun --
Research on the mechanism of acoustic signal detection based on EMI and ANN Technology / Wei-Ping Zhu / Hai-Hong Bian / Xiao-Dong Yuan --
Restoration from noise pollution for quantum images / Hong-Mei Tang / Jun Zhang / Tian-Bo Wang --
A parallel design for Burrows-Wheeler transform based DNA sequences data / Kai Liu / Yi Zhang / Xiao-Ping Wang / Kai Lu --
Fourier representation of intergrid operator for 2D scalar problem in multigrid method / Kai Wang / Bin Chen / Guang-Ri Quan / Zhen-Zhou Ji Note continued: An approach to structural damage identification using eigenvalue analysis / Xing-Wen Zhu / Li-Xiang Zhang --
Computational investigation of supersonic inlet with different numerical methods / Wei-Zhen Chen / Long Zhou / Tao Hu --
The application of cylindrical helix theory to ultrasonic testing / Qing Cui / Long-Kai Guo / Si-Cheng Chen / Ping-Chao Liu --
Design scheme for real-time data management information system (RMIS), DEH systems of units #4-#7 of PetroChina Daqing petrochemical company thermal power plant / Ping-Yong Li / Yi Huang / Peng Du / Lei You --
A novel gridless adaptive method / Yong-Bo Zhu --
The application of big data in the area of equipment command / Liang Wang / Hou-Qian Xu / Wei Wu / Rui Xue --
Estimation of sea state parameters based on PACSCAT motion response data / Heng Dai / Hua-Wen Song / Peng Wang Note continued: Scattered point cloud simplification Based on feature points / Jia-Yuan Zhuang / Han-Bing Sun / Wei Wang / Feng Xu / Ji-Qiang Cai --
The virtual design of air-suction corn precision metering device with compensation equipment / Cheng-Jun Tian / Qi-Feng Niu / Shu-Hua Jiang --
Optimizing structural design of parking system using discrete variables in ANSYS environment / Zhi-Wei Tian / Zhi-Qiang Yang / Sen Yao / Tao Chen / Xiao-Rong Lv --
Design of releasing device based on ergonomics / Ge-Ning Xu / Jia-Rong Chen / Xing-Feng Wang / Kun An / Ning Xu --
The optimization design and simulation analysis of parameters for an adjustable chain transmission mechanism / Li-Zhen Zhang / Wan-Xia Sheng / Hao-Tian Chou / Qing-Long Wu --
Overview of simulation of human lower limb motion / Dong-Xing Cao / Zhao-Feng Xin / Ji-Wei Yao / Bao-Ling Zong Note continued: Application of reliability system engineering in life cycle management of high-tech equipment / Li Zhu / Feng Hu / Yu-Chuan Wu / Wei Li --
Coil flipping clamp virtual modeling and simulation / Peng Wang / Hua-Wen Song / Heng Dai --
Experiment of reliability evaluation under the condition of poor information / Han Wei / Hai-Bin Qin --
Reliability evaluation theory of zero-failure data with bootstrap maxi mum entropy method / Xin-Tao Xia / Liang Ye / Wen-Huan Zhu / Yuan-Kun Zhou / Yu-Ting Zhou --
The demand-side response resource value assessment model based on rough set theory / Xin-Tao Xia / Liang Ye / Wen-Huan Zhu / Yuan-Kun Zhou / Zhen Chang --
Nonlinear dynamic loads simulation of integrated aircraft flexible dynamic models / Xue-Feng Ma / Bin Ji / Lu Fin / Xue-Nan Li / Yang Lv / Jing-Hui Sun --
Simulation and evaluation of marine production virtual factory / Jun-Jie Li / Shen-Gang Tan / Li-Dong Pu / Xian-Ang Zeng / Ying-Yuan Huo Note continued: 3D modeling of HIT hypoid gear set based on the Boolean operation of UG / Jin-Song Bao / Qiao Leng / Kai Sheng / Qian-Qian Wu / Xin-Guo Ming / Li-Ya Wang --
Study on dynamic characteristics of large Dockside Container Crane based on virtual simulation / Wei Feng / Liang Zhang --
Flutter-boundary prediction with ARMA-based reduced-order model / Chuan-Ling Jin / Kai Huang / Hui Jin / Xiang-Dong Li / Jian-Qin Xu / Zhi-Bing Zhang / Yi-Hui Zhang --
Research on the method of modeling and parameter identification method of precision harmonic drive component / Yan-Feng Ma / Er-Ming He / Xian-Ang Zeng / Jun-Jie Li --
Numerical simulation methodology based on typical shaped charge structure / Kai Li / Zhi-Yong Zhang --
Preliminary assessment and prediction model of seismic casualties based on geographical similarities / Han Liu / Jian-Bing Men / Jian-Wei Jiang / Shou-You Wang Note continued: Research on IETM function expansion of complex weapon equipment system / Yu-Wen Hao / Xiao-Xue Li / Zhe Zhao / Jing-Chen Zheng / Yang Yang / He Li --
Lattice Boltzmann method for the simulating transient extrudate swell / Yuan Wang / Sheng-Yan Chang / Qian Li --
Research on thermal comfort degree response space and energy saving potential of summer air-conditioning / Yong Li / Wen-Yu You --
Matrix stretching operations / Qing-Guo Yan / Chu Chen / Bin Yang / Xu-Fang Wang / Yong-Biao Yang / Lu Chen.