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| 1 | On-machine Precision Preparation and Dressing of Ball-headed Diamond Wheel for the Grinding of Fused Silica显示文摘In the grinding of high quality fused silica parts with complex surface or structure using ball-headed metal bonded diamond wheel with small diameter,the existing dressing methods are not suitable to dress the ball-headed diamond wheel precisely due to that they are either on-line in process dressing which may causes collision problem or without consideration for the effects of the tool setting error and electrode wear.An on-machine precision preparation and dressing method is proposed for ball-headed diamond wheel based on electrical discharge machining.By using this method the cylindrical diamond wheel with small diameter is manufactured to hemispherical-headed form.The obtained ball-headed diamond wheel is dressed after several grinding passes to recover geometrical accuracy and sharpness which is lost due to the wheel wear.A tool setting method based on high precision optical system is presented to reduce the wheel center setting error and dimension error.The effect of electrode tool wear is investigated by electrical dressing experiments,and the electrode tool wear compensation model is established based on the experimental results which show that the value of wear ratio coefficient K' tends to be constant with the increasing of the feed length of electrode and the mean value of K' is 0.156.Grinding experiments of fused silica are carried out on a test bench to evaluate the performance of the preparation and dressing method.The experimental results show that the surface roughness of the finished workpiece is 0.03 μm.The effect of the grinding parameter and dressing frequency on the surface roughness is investigated based on the measurement results of the surface roughness.This research provides an on-machine preparation and dressing method for ball-headed metal bonded diamond wheel used in the grinding of fused silica,which provides a solution to the tool setting method and the effect of electrode tool wear. | CHEN Mingjun LI Ziang YU Bo PENG Hui FANG Zhen | 2013 | Chinese Journal of Mechanical Engineering2013，26，5： | 5 |
| 2 | The additional force in the cooling process of cellular Al alloy显示文摘 | Zhen Mingjun He Deping Dai Ge | 2002 | Science in China:B2002，32，3： | 1 |
| 3 | Additive nanomanufacturing of lab-on-a-chip fluorescent peptide nanoparticle arrays for Alzheimer's disease diagnosis显示文摘 | Leming Sun Zhen Fan Tao Yues Jun Yin Jianzhong FU Mingjun Zhang | 2018 | Bio-Design and Manufacturing2018，1，3： | 1 |
| 4 | Structure transformation from Sierpiński triangles to chains assisted by gas molecules显示文摘Reversible transformations between fractals and perio dic structures are of fundamental importance for understanding the formation mechanism of fractals.Currently,it is still a challenge to controllably achieve such a transformation.We investigate the effect of CO and CO_(2)molecules on Sierpiński triangles(STs)assembled from Fe atoms and 4,4″-dicyano-1,1′:3′,1″-terphenyl(C3PC)molecules on Au surfaces.Using scanning tunneling microscopy,we discover that the gas molecules induce a transition from STs into 1D chains.Based on density functional theory modeling,we propose that the atomistic mechanism involves the transformation of a stable 3-fold coordination Fe(C3PC)_(3)motif to Fe(C3PC)_(4)with an axially bonded CO molecule.CO_(2)causes the structural transformation through a molecular catassembly process. | Chao Li Zhen Xu Yajie Zhang Jie Li Na Xue Ruoning Li Mingjun Zhong Tianhao Wu Yifan Wang Na Li Ziyong Shen Shimin Hou Richard Berndt Yongfeng Wang Song Gao | 2023 | National Science Review2023，10，7： | 0 |
| 5 | Combining methylated SEPTIN9 and RNF180 plasma markers for diagnosis and early detection of gastric cancer显示文摘Dear Editor,Early diagnosis is critical for successful treatment of gastric adenocarcinoma(GA).However,the sensitivities of tumor markers carcinoembryonic antigen(CEA),cancer antigen 19-9(CA19-9)and CA72-4 for GA detection are approximately 20%[1],and the sensitivities of all markers combined for early gastric cancer detection is still very low[2].DNA methylation plays a major role in tumorigenesis and therefore has obvious potential as a non-invasive biomarker for cancer detection[3].Through genome-wide methylation analysis and histological verification,we previously identified ring finger protein 180(RNF180)as a novel preferentially methylated gene in GA[4,5]. | Yongzhan Nie Xianchun Gao Xiqiang Cai Zhen Wu Qiaoyi Liang Guobing Xu Na Liu Peng Gao Jingyu Deng Hongzhi Xu Zhanlong Shen Changqi Cao Fenrong Chen Nannan Zhang Yongxi Song Mingjun Sun Chengyin Liu Guangpeng Zhou Weili Han Jianhua Dou Huahong Xie Liping Yao Zhiguo Liu Gang Ji Xin Wang Qingchuan Zhao Lei Shang Daiming Fan Xiaoliang Han Jianlin Ren Han Liang Zhenning Wang Jinhai Wang Qi Wu Jun Yu Kaichun Wu the MAGIS Study Group | 2023 | Cancer Communications2023，43，11： | 0 |
| 6 | Construction and electrical control of ultrahigh-density organic memory arrays at cr yog enic temperature显示文摘Investigation into the structural and magnetic properties of organic molecules at cryogenic temperature is beneficial for reducing molec-ular vibration and stabilizing magnetization,and is of great im-portance for constructing novel spintronics devices of better perfor-mance and scaling the device size down to nanoscale.In order to explore the possibility of fabricating molecule-based memory chips of ultrahigh density,two-dimensional close-packed molecular arrays with carboxylic acid molecules were constructed in the current work and the magnetic properties in a low-temperature scanning tunnel-ing microscope were also investigated.The results demonstrated that each nonmagnetic molecule can be controllably and independently switched into a stable spin-carrying state at 4 K by applying a voltage pulse with atomic resolution.Benefiting from the small size of a single molecule as the basic storage bit,the two-dimensional molecular ar-rays allowing controllable electrical manipulations on each molecule can behave as a platform of memory chip with an ultrahigh storage density of∼320 terabytes(Tb)(or∼2500 terabits)per square inch.This work highlights the potential and advantage of employing or-ganic molecules in developing future cryogenic information storage techniques and devices at nanoscale. | Mingjun Zhong Jie Li Yajie Zhang Xin Li Zhen Xu Qian Shen Xue Zhang Yongfeng Wang | 2023 | Chip2023，2，3： | 0 |
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