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New organic scintillation fiber detector for the measurement of intense pulsed fission neutron

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Science China(Technological Sciences) 2012年第1期55卷 43-47页

作者： CHEN Liang OUYANG XiaoPing zhang ZhongBing LIU JinLiang zhang xianpeng Northwest Institute of Nuclear Technology Xi＇an 710024 China

To measure the pulsed neutron of a pulsed fission source, an organic scintillation fiber （OSF） detector with separation structure has been designed. The proposed detector employs UV optical fibers as the light guide, and the sensitive region of the detector is composed of a linear array of OSFs, which are individually connected to the optical fibers. The other end of the light guide is coupled to a photomultiplier tube. The key properties of the device including the energy response, time response, neutron sensitivity, and radiation effect of the optical fiber were studied. The detector has a relatively high n/γ sensitivity ratio, which increases as the diameter of the OSF decreases, and ratios greater than 10 could be achieved when the diameter of the OSF is less than 0.3 nun. The sensitivity of the detector to neutrons ranges from 10-14 to 10-20 C cm2/n, and has a response time of 3 ns （FWHM）. The proposed detector is also highly flexible. For instance, the probe can be set close to the source, while the PMT can be placed far away from radiation, allowing easy shielding. Due to these characteristics, pulsed fission neutrons in the vicinity of the source can be accurately measured.

关键词： organic scintillation fiber pulsed neutron detection n/γ sensitivity ratio energy response UV optical fiber

Polycrystalline chemical-vapor-deposited diamond for fast and ultra-fast neutron detection

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Science China(Technological Sciences) 2012年第9期55卷 2640-2645页

作者： LIU LinYue OUYANG XiaoPing zhang ZhongBing zhang JianFu zhang xianpeng ZHONG YunHong WANG Wei Northwest Institute of Nuclear Technology Xi'an 710024China Xi'an Jiaotong University Xi'an 710049China

An intrinsic sensor （diameter 16 ram, thickness 300 μm ） based on chemical vapor deposition derived polycrystailine diamond was developed. Ultra low dark current under 100 pA and high n/γ discrimination of 15.8 were obtained on this device, which enable it to be used for neutron detection in multi-radiation field. Moreover, the neutron sensitivity of this detector was characterized theoretically and experimentally. And for fast and ultra-fast neutron, the detection sensitivity is in the magnitude of 10^-17 to 10^-16 C cm^2/n with good stability and negligible pump effect. All these results indicate that the as-prepared sensor to be ideal for fast and ultra-fast neutron monitoring, and it may pave the way to build neutron detector with low cost and large sensitive area with diamond.

关键词： neutron detection CVD diamond detector semiconductor

Image reconstruction of a neutron scatter camera

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Science China(Technological Sciences) 2016年第1期59卷 149-155页

作者： zhang xianpeng zhang Mei SHENG Lang zhang ZhongBing LI Kui Nian PENG BoDong zhang XiaoDong OUYANG XiaoPing LIU Jun LIU JinLiang CHEN Liang ZHU Jie HE ChaHui School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an 710049China Northwest Institute of Nuclear Technology P.O.Box 69-9Xi'an 710024China

Recently, Sandia Laboratories developed a neutron scatter camera to detect special nuclear materials. This camera exhibits the following advantages: high efficiency, direction discrimination, neutron-gamma discrimination ability, and wide field of view. However, using the direct projection method, the angular resolution of this camera is limited by uncertainties in the energies estimated from pulse height and time of flight measurements. In this study, we established an eight-element neutron scatter camera and conducted the experiment with a ^(252)Cf neutron source. The results show that it has an angular resolution better than 8°(1s) and a detection efficiency of approximately 2.6′10-4. Using maximum likelihood expectation maximization method, the image artifact was eliminated, and the angular resolution was improved. We proposed an average scattering angle method to estimate the scattering energy of neutrons and Compton gamma rays. As such, we can obtain a recognizable image and energy spectrum of the source with some degradation of energy and image resolutions. Finally, a newly measured light response function based on the MPD^(-4) device was used for image reconstruction. Although we did not obtain a better result than that of the standard light response function, we have observed the effects of light response function on image reconstruction.

关键词： neutron scatter camera ^(252)Cf neutron source energy reconstruction image reconstruction maximum likelihood expectation maximization time of flight light response function

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国产主从式机械手电动部分改为遥控的设计

核动力工程 2016年第S1期37卷 12-13页

作者：张显鹏江常玉中国核动力研究设计院成都610213

针对国产ZC系列主从式机械手的电动部分进行遥控方式改造。改造后的机械手前、后、左、右均能使用遥控器灵活控制,操作人员可以更靠近热室窥视窗,扩大了操作范围。

关键词：机械手遥控改造

Engineering self-healing adhesive hydrogels with antioxidant properties for intrauterine adhesion prevention

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Bioactive Materials 2023年第9期27卷 82-97页

作者： Luyao Feng Liqun Wang Yao Ma Wanglin Duan Sergio Martin-Saldana Ye Zhu xianpeng zhang Bin Zhu Chaowei Li Shibo Hu Mingjie Bao Ting Wang Yuan Zhu Fei Yang Yazhong Bu Institute of Medical Engineering Department of BiophysicsSchool of Basic Medical SciencesHealth Science CenterXi’an Jiaotong UniversityXi’an710061China Department of Reproductive Health Jiangxi Maternal and Child Health HospitalNanchangJiangxi330006China POLYMAT Applied Chemistry DepartmentFaculty of ChemistryUniversity of the Basque Country UPV/EHUPaseo Manuel de Lardizabal 320018Donostia-San SebastianSpain JXHC Key Laboratory of Fertility Preservation Jiangxi Maternal and Child Health HospitalNanchangJiangxi330006China School of Chemical Sciences University of Chinese Academy of SciencesBeijing100049China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Physics&ChemistryInstitute of ChemistryChinese Academy of SciencesBeijing100190China

Intrauterine adhesion (IUA) is the fibrosis within the uterine cavity. It is the second most common cause of female infertility, significantly affecting women’s physical and mental health. Current treatment strategies fail to provide a satisfactory therapeutic outcome for IUA patients, leaving an enormous challenge for reproductive science. A self-healing adhesive hydrogel with antioxidant properties will be highly helpful in IUA prevention. In this work, we prepare a series of self-healing hydrogels (P10G15, P10G20, and P10G25) with antioxidant and adhesive properties. Those hydrogels exhibit good self-healing properties and can adapt themselves to different structures. They possess good injectability and fit the shape of the human uterus. Moreover, the hydrogels exhibit good tissue adhesiveness, which is desirable for stable retention and therapeutic efficacy. The in vitro experiments using P10G20 show that the adhesive effectively scavenges ABTS+, DPPH, and hydroxyl radicals, rescuing cells from oxidative stress. In addition, P10G20 offers good hemocompatibility and in vitro and in vivo biocompatibility. Furthermore, P10G20 lowers down the in vivo oxidative stress and prevents IUA with less fibrotic tissue and better endometrial regeneration in the animal model. It can effectively downregulate fibrosis-related transforming growth factor beta 1 (TGF-β1) and vascular endothelial growth factor (VEGF). Altogether, these adhesives may be a good alternative for the clinical treatment of intrauterine adhesion.

关键词： Adhesive Hydrogel Intrauterine adhesion Self-healing Antioxidant

Bone analysis using an aggregation-induced emission-active iridium complex

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Aggregate

Aggregate 2023年第6期4卷 110-119页

作者： xianpeng zhang Xinling Liu Hongwen Yu Shuang Shen Junchao Zhi Zhen GaoJingqi Xin Jiaqi Song Liang Shao Caiting Meng Feifei An Taotao Huo Shichang Liu Ye zhang Li Xu Guanying Li Department of Biophysics School of Basic Medical SciencesHealth Science CentreXi’an Jiaotong UniversityXi’anP.R.China School of Chemistry and Chemical Engineering Guangdong Pharmaceutical UniversityZhongshanP.R.China Department of Spine Surgery Honghui HospitalXi’an Jiaotong UniversityXi’anP.R.China Active Soft Matter Group Songshan Lake Materials LaboratoryDongguanP.R.China School of Public Health Health Science CentreXi’an Jiaotong UniversityXi’anP.R.China

Fluorescent analysis of bone provides valuable insights into bone ***,conventional dyes suffer from low specificity on bone tissue,small stokes shift,short fluorescent lifetime,and aggregation-caused quenching effect,which result in low efficacy and *** this work,we design an aggregation-induced emission(AIE)-active iridium(III)complex(Ir-BP2)as a highly selective,convenient,nondestructiveness,and dual-mode staining agent for bone ***-BP2 containing phosphonate groups selectively binds to hydroxyapatites,the main component of bone matrix,and exhibits turn-on AIE phosphorescence with prolonged ***-BP2 exhibits promising biosafety and offers higher accuracy in staining calcium deposits than conventional Alizarin Red S staining assay when it is employed in real-time monitoring of osteogenesis differentiation process.A ready-to-use staining spray of Ir-BP2 is *** using fluorescent imaging and lifetime imaging,Ir-BP2 staining provides valuable insights into bone microstructure analysis,microdamage diagnosis,and bone growth state ***,Ir-BP2 is successfully applied on a human spine vertebra for diagnosing bone invasiveness of eosinophilic granuloma,validating its clinical *** work presents a powerful tool in bone analysis and will lead to new approaches for the diagnosis and treatment of bone-related diseases.

关键词： aggregation-induced emission bone analysis clinical diagnosis eosinophilic granuloma iridium complexes phosphorescent probe

1000℃MgO-B2O3-SiO2 三元相关系研究

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东北大学学报(自然科学版) 1997年第4期 26-29页

作者： Liu Sulan,Che Yinchang,Shangguan Yingquan,zhang xianpeng,Dai Xingfu

ＭｇＯ－Ｂ２Ｏ３－ＳｉＯ２三元系１０００℃时，３５％≤ＭｇＯ％＜６０％组成范围内平衡相均为固相，其相关系可由Ｍｇ３Ｂ２Ｏ６－Ｍｇ２ＳｉＯ４－Ｍｇ２Ｂ２Ｏ５，Ｍｇ２Ｂ２Ｏ５－Ｍｇ２ＳｉＯ４－ＭｇＳｉＯ３，Ｍｇ２Ｂ２Ｏ５... 详细信息

ＭｇＯ－Ｂ２Ｏ３－ＳｉＯ２三元系１０００℃时，３５％≤ＭｇＯ％＜６０％组成范围内平衡相均为固相，其相关系可由Ｍｇ３Ｂ２Ｏ６－Ｍｇ２ＳｉＯ４－Ｍｇ２Ｂ２Ｏ５，Ｍｇ２Ｂ２Ｏ５－Ｍｇ２ＳｉＯ４－ＭｇＳｉＯ３，Ｍｇ２Ｂ２Ｏ５－Ｍｇ－ＳｉＯ３－ＳｉＯ２三个结线三角形表示．各平衡相量之间关系可应用ＸＲＤ定量相分析或重心规则计算．

关键词： B2O3三元系相关系 XRD 定量相分析

粗糙圆柱水平入水的界面流动分离特性试验研究

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中国科学：技术科学 2019年第9期49卷 1064-1072页

作者：任选其徐绯张显鹏杨扬西北工业大学航空学院

针对具有微米级颗粒的粗糙圆柱水平入水开展试验研究,通过以高速摄影为工具的流动显示技术研究了粗糙圆柱以不同初速度入水后,水与圆柱表面的界面流动发生的几何形态、运动的变化,对流动分离位置进行了较准确的测量.研究表明,粗糙表面... 详细信息

针对具有微米级颗粒的粗糙圆柱水平入水开展试验研究,通过以高速摄影为工具的流动显示技术研究了粗糙圆柱以不同初速度入水后,水与圆柱表面的界面流动发生的几何形态、运动的变化,对流动分离位置进行了较准确的测量.研究表明,粗糙表面会导致圆柱入水时气-固-液三相接触线出现锯齿形失稳,接触线速度明显降低,液面更容易与圆柱表面分离.其次,对液面分离的影响因素开展研究,发现随着表面颗粒尺寸减小和单位面积的颗粒数目增加,分离角呈现先增大后减小再增加的变化规律;随着入水速度的增加,分离角度减小,界面流动更容易发生分离.最后,通过对不同粗糙表面静态及动态接触角的测量,对粗糙表面动态接触角滞后特性与入水界面流动分离的相关性问题开展了研究.

关键词：入水表面粗糙流动分离接触角滞后

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轮胎滚动溅水与垂直入水相似性分析

中国科学：技术科学 2018年第9期48卷 931-938页

作者：张显鹏徐绯任选其杨扬西北工业大学航空学院计算力学与工程应用研究所西安710072

飞机在积水跑道上滑跑时,轮胎溅起的水可能进入发动机,导致发动机出现掉转、喘振甚至熄火等现象.以往对机轮溅水问题的研究主要采用全机溅水试验的方法,这样的试验价格昂贵,且得到的有效数据有限.首先,通过对轮胎溅水机理的分析,根据流... 详细信息

飞机在积水跑道上滑跑时,轮胎溅起的水可能进入发动机,导致发动机出现掉转、喘振甚至熄火等现象.以往对机轮溅水问题的研究主要采用全机溅水试验的方法,这样的试验价格昂贵,且得到的有效数据有限.首先,通过对轮胎溅水机理的分析,根据流动相似理论以及切片法思想,阐述了轮胎滚动溅水与垂直入水的相似性.然后,使用LS-DYNA商业软件分别建立了基于SPH-FEM耦合方法的弹性带翻边轮胎滚动溅水与垂直入水模型,根据数值计算结果分析了两系统中侧向喷溅的形成机理,并对比了两种侧向喷溅的正视溅水形态、溅水速度以及翻边的作用效果.结果表明,当两系统中轮胎速度存在一定对应关系时,两种侧向喷溅的正视形态存在相似性.最后,根据这种相似性提出了采用轮胎垂直入水试验研究机轮溅水形态的新方法,为该问题的研究提供了新的思路.

关键词：飞机轮胎溅水光滑粒子流体动力学(SPH) 流动相似理论切片法