The engineblock production lines need high speed tapping with tungsten carbide taps. In the tapping process, the machining precision and the tool life of taps are directly influenced by tapping forces. And the paramet...The engineblock production lines need high speed tapping with tungsten carbide taps. In the tapping process, the machining precision and the tool life of taps are directly influenced by tapping forces. And the parameter optimization of tap structures is also correlated with the variation of tapping forces. Therefore, the study of tapping forces is necessary in developing new style taps. Several experiments about some novel carbide taps are performed on a vertical machining center by a Kistler dynamometer system in blind tapping both gray cast iron and ductile cast iron. And the variations of tapping forces are analyzed in tapping-in and tapping-out periods. It indicates that cutting forces hardly vary with the tap wear in tapping cast iron. Contrarily, tapping forces are closely correlated with the holding method. Besides, it also depends on the helix angle, the flute numbers and the plasticity of the work material to some extent.展开更多
The continuous operation of On-Load Tap-Changers (OLTC) is essential for maintaining stable voltage levels in power transmission and distribution systems. Timely fault detection in OLTC is essential for preventing maj...The continuous operation of On-Load Tap-Changers (OLTC) is essential for maintaining stable voltage levels in power transmission and distribution systems. Timely fault detection in OLTC is essential for preventing major failures and ensuring the reliability of the electrical grid. This research paper proposes an innovative approach that combines voiceprint detection using MATLAB analysis for online fault monitoring of OLTC. By leveraging advanced signal processing techniques and machine learning algorithms in MATLAB, the proposed method accurately detects faults in OLTC, providing real-time monitoring and proactive maintenance strategies.展开更多
本研究分析汉族人群tap1和tap2基因座等位基因和基因型频率的分布及意义。运用TaqManPCR分型技术调查339例中国健康汉族人群随机样本tap1(transporter associated with antigen processing)和tap2基因座等位基因频率和基因型频率分布,...本研究分析汉族人群tap1和tap2基因座等位基因和基因型频率的分布及意义。运用TaqManPCR分型技术调查339例中国健康汉族人群随机样本tap1(transporter associated with antigen processing)和tap2基因座等位基因频率和基因型频率分布,并计算个体鉴别力、累积鉴别力、多态性信息含量、无偏倚期望杂合性、观察杂合性等遗传参数。结果表明:共有5种tap1等位基因(tap1*0101、020101、020102、0301和0401)和4种tap2等位基因(tap2*0101、0102、0103和0201)被检出,tap1实际检出基因型8种,占理论基因型的53.3%,tap2实际检出基因型6种,占理论基因型60%。Tap1和tap2基因型分型结果符合Hardy-Weinberg定律(p>0.05)。Tap1*0101(79.79%)和tap2*0101(82.74%)在中国汉族人群中分布最广。结论:Tap1*0101和tap2*0101在汉族人群中分布最广。Tap1和tap2基因座具有一定的信息量和个体鉴别能力,可用于人类遗传学、遗传疾病基因连锁分析、法医学亲子鉴定和个体识别等研究领域。展开更多
文摘The engineblock production lines need high speed tapping with tungsten carbide taps. In the tapping process, the machining precision and the tool life of taps are directly influenced by tapping forces. And the parameter optimization of tap structures is also correlated with the variation of tapping forces. Therefore, the study of tapping forces is necessary in developing new style taps. Several experiments about some novel carbide taps are performed on a vertical machining center by a Kistler dynamometer system in blind tapping both gray cast iron and ductile cast iron. And the variations of tapping forces are analyzed in tapping-in and tapping-out periods. It indicates that cutting forces hardly vary with the tap wear in tapping cast iron. Contrarily, tapping forces are closely correlated with the holding method. Besides, it also depends on the helix angle, the flute numbers and the plasticity of the work material to some extent.
文摘The continuous operation of On-Load Tap-Changers (OLTC) is essential for maintaining stable voltage levels in power transmission and distribution systems. Timely fault detection in OLTC is essential for preventing major failures and ensuring the reliability of the electrical grid. This research paper proposes an innovative approach that combines voiceprint detection using MATLAB analysis for online fault monitoring of OLTC. By leveraging advanced signal processing techniques and machine learning algorithms in MATLAB, the proposed method accurately detects faults in OLTC, providing real-time monitoring and proactive maintenance strategies.
文摘本研究分析汉族人群tap1和tap2基因座等位基因和基因型频率的分布及意义。运用TaqManPCR分型技术调查339例中国健康汉族人群随机样本tap1(transporter associated with antigen processing)和tap2基因座等位基因频率和基因型频率分布,并计算个体鉴别力、累积鉴别力、多态性信息含量、无偏倚期望杂合性、观察杂合性等遗传参数。结果表明:共有5种tap1等位基因(tap1*0101、020101、020102、0301和0401)和4种tap2等位基因(tap2*0101、0102、0103和0201)被检出,tap1实际检出基因型8种,占理论基因型的53.3%,tap2实际检出基因型6种,占理论基因型60%。Tap1和tap2基因型分型结果符合Hardy-Weinberg定律(p>0.05)。Tap1*0101(79.79%)和tap2*0101(82.74%)在中国汉族人群中分布最广。结论:Tap1*0101和tap2*0101在汉族人群中分布最广。Tap1和tap2基因座具有一定的信息量和个体鉴别能力,可用于人类遗传学、遗传疾病基因连锁分析、法医学亲子鉴定和个体识别等研究领域。
