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Online Cutting Temperature Measurement System Based Thermocouple
Wang zhengyu,Yu xiaoyang,Li guanghui,Tan guangyu 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.10
In order to measure cutter temperature, the on-line thermocouple temperature measurement system was proposed. In this system, temperature sensing element thermocouple was welded in the flank face close to the cutting edge with double bare wires welding way. With this method, this system has advantages of a single point temperature measurement and no effect on cutter temperature distribution. For a higher sampling rate, two AD were used to sample alternately; and for the convenient signal transmission when the cutter is rotating at high speed, wireless transmission was adopted to transmit thermocouple output signal and cold side temperature signal to the host computer. After temperature compensation to the cold side, the compensated temperature will be real-time displayed, stored and played back. System measurement range is 0 ~ 1300 ° C, and the measurement uncertainty is 0.58%. For 8000rpm rotational speed of XH714D machine, experimental results show that the system can measure cutter temperature online, and has advantages of low cost and great practicability.
Hyun, Myung Ho,Tan, Guanghui,Xue, Jin Ying Elsevier 2005 Journal of chromatography A Vol.1097 No.1
<P><B>Abstract</B></P><P>While HPLC chiral stationary phases (CSPs) based on chiral crown ethers have been known useful for the resolution of only racemic primary amino compounds or some secondary amino compounds, in this study, we first demonstrated that the CSP based on (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid is also useful for the resolution of <I>N</I>-benzoyl-α-amino acids, which do not contain a primary or secondary amino group. Especially, <I>N</I>-(3,5-dinitrobenzoyl)-α-amino acids were resolved better than corresponding <I>N</I>-(3-nitrobenzoyl)- or <I>N</I>-benzoyl-α-amino acids, the separation (<I>α</I>) and the resolution factors (<I>R</I><SUB>S</SUB>) for the resolution of eight <I>N</I>-(3,5-dinitrobenzoyl)-α-amino acids being in the range of 1.06–1.81 and 0.54–2.81, respectively. The optimum mobile phase condition was the mixture of acetic acid–triethylamine–acetonitrile with the ratio of 0.05/0.25/100 (v/v/v).</P>
현명호,최희정,Bu Sung Kang,Guanghui Tan,Yoon Jae Cho 대한화학회 2006 Bulletin of the Korean Chemical Society Vol.27 No.11
A liquid chromatographic chiral stationary phase (CSP) based on (+)-(18-crown-6)-2,3,11,12-tetracarboxilic acid without extra free aminopropyl groups on silica surface has been demonstrated to be quite effective for the resolution of various b-amino acids. The retention factors (k1) for the resolution of b-amino acids on the CSP were quite large and the large retention factors might be quite attractive along with the reasonable separation factors (a) for preparative scale enantioselective chromatography. The large retention factors on the CSP were found to be reduced effectively by adding ammonium ion to mobile phase without sacrificing the chiral recognition efficiency of the CSP. Consequently, the CSP is also quite applicable for use in analytical enantioselective chromatography.
현명호,Chang Jin Boo,최희정,Yun Kyoung Kim,Bu Sung Kang,Hyun Ju Ha,Min Ki Choi,Guanghui Tan 대한화학회 2006 Bulletin of the Korean Chemical Society Vol.27 No.11
A new liquid chromatographic chiral stationary phase based on (2S,3S)-O,O'-bis-(10-undecenoyl)-N,N'-bis-(3,5-dinitrobenzoyl)-2,3-diamino-1,4-butandiol was prepared starting from (2R,3R)-1,4-bis(benzyloxy)-2,3-butanediol. The new chiral stationary phase was applied to the resolution of racemic anilide derivatives of N-acetyl-a-amino acids, 1,1'-bi-2-naphthol and 3,3'-diaryl-1,1'-bi-2-naphthols. The CSP was also applied to the resolution of some chiral drugs including a diuretic, bendroflumethiazide, and non-steroidal anti-inflammatory agents such naproxen and alminoprofen. In every case, the chiral recognition efficiency of the new CSP was quite excellent.