三次元CADおよび光造形の設計教育への適用

Introduction of a rapid prototyping device let us apply three-dimensional CAD and the device itself for the education of design in the department of mechanical engineering. In graduation project of our laboratory, concurrent engineering for various mechanical products was investigated by mean of rapid prototyping and a three-dimensional CAD system. Furthermore, some three-dimensional CAD model data and photo fabrication (rapid prototyped) models obtained by the above systems were demonstrated to the students in the class of design education. This report deals with the features of two-and three-dimensional CAD. Moreover, concurrent engineering concept, which recently the companies in japan have shown interest in, and the contents of design education were described herein

新疆塔里木盆地北部碳酸盐岩欠平衡钻井技术研究

该课题根据碳酸盐岩储层的特点，提出了欠平衡钻井设备配置方案并进行了实施；建立了欠平衡钻井参数计算机数学模型，确定了塔北碳酸盐岩储层欠平衡钻井参数控制范围，研究了欠平衡压力与立管压力、排量之间的关系；制定了塔北碳酸盐岩储层欠平衡钻井施工方案，形成了现场操作的压井方法和井控技术；研制出低胶聚黄钻井液和无固相盐水聚合物钻井液两套适合塔北地区碳酸盐岩特征的欠平衡钻井液体系。在发现产层、保护油气层、解决严重井漏等工程复杂问题和提高机械钻速方面取得显著效果。该课题圆满完成了“九五”国家科技攻关计划规定的研究任务，成规压力碳酸盐岩储层欠平衡钻井达到国内领先水平

23Na MAS NMR Spectroscopic Study of Na2MnPO4F as Cathode Material for Sodium-Ion Battery

Na2MnPO4F材料是一种很有发展前景的钠离子电池正极材料，本文通过非原位XRD和固体核磁共振技术研究该材料充放电结构变化（晶体结构与局域Na位）. 非原位XRD测试发现，充电过程在2θ为31o和36o左右出现新的衍射峰，表明钠脱出后电极上有中间相物质生成. 23Na MAS NMR谱图的-209 ppm、-258 ppm和-295 ppm三个谱峰分别对应于该材料结构中Na1 + Na2位、Na3位和Na4位. 非原位23Na MAS NMR谱研究发现，充电过程中-209 ppm处信号峰面积比例减小，表明Na1和Na2位的Na比Na3和Na4位先脱出. 充电至4.2 V，-132 ppm和-330 ppm处出现中间相物质的信号峰；而放电过程则相反.The Na2MnPO4F is one of the promising cathode materials for the sodium ion batteries. In the paper, we employed the ex situ X-ray diffraction and solid state NMR techniques to study the charge and discharge processes of this material, including the crystal structure and sodium sites changes. The ex situ x-ray diffraction patterns showed that two new diffraction peaks could be observed at 31o and 36o indicating an intermediate phase formed with the extraction of Na+. From the 23Na MAS NMR spectrum of the material, three peaks were seen at -209 ppm，-258 ppm and -295 ppm, which can be assigned to Na1 + Na2, Na3 and Na4 sites in the crystal structure, respectively. The ex situ solid state NMR study demonstrated that the Na+ in Na1 and Na2 sites deintercalated firstly compared to Na3 and Na4 sites. The signal peaks of intermediate phase appeared at -132 ppm and -330 ppm when charging to 4.2 V. The opposite phenomenon occurred during the discharge process.973国家重点基础研究发展计划（No. 2011CB935903）和国家自然科学基金（No. 21233004、No. 21021002）项目资助作者联系地址：厦门大学 化学化工学院化学系，固体表面物理化学国家重点实验室，福建 厦门 361005Author's Address: State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China通讯作者E-mail：[email protected]

Amplitude analysis of the decays D0 → π+π−π+π− and D0 → π+π−π0π0*

Using e+e− annihilation data corresponding to an integrated luminosity of 2.93 fb−1 taken at the center-of-mass energy √s = 3.773 GeV with the BESIII detector, a joint amplitude analysis is performed on the decays D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η). The fit fractions of individual components are obtained, and large interferences among the dominant components of the decays D0 → a1(1260)π, D0 → π(1300)π, D0 → ρ(770)ρ(770), and D0 → 2(ππ)S are observed in both channels. With the obtained amplitude model, the CP-even fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are determined to be (75.2 ± 1.1stat. ± 1.5syst.) % and (68.9 ± 1.5stat. ± 2.4syst.)%, respectively. The branching fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are measured to be (0.688 ± 0.010stat. ± 0.010syst.)% and (0.951 ± 0.025stat. ± 0.021syst.)%, respectively. The amplitude analysis provides an important model for the binning strategy in measuring the strong phase parameters of D0 → 4π when used to determine the CKM angle γ(φ3) via the B− → DK− decay

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies