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Study of the front-end signal for the 3-inch PMTs instrumentation in JUNO

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Radiation Detection Technology and Methods 2022年第3期6卷 349-360页

作者： Diru Wu jilei xu Miao He Zhimin Wang Ziliang Chu Institute of High Energy Physics Beijing 100049China University of Chinese Academy of Sciences Beijing 100049China

A total of 25,6003-inch PMTs will be installed in Jiangmen Underground Neutrino Observatory(JUNO)to achieve more precise energy calibration and to extend the physics detection *** of all bare PMTs have been characterized and these PMTs are being instrumented with the high voltage divider,underwater front-end cable,and *** this paper,we present a dedicated study on signal quality at different stages of the *** optimized high voltage ratio was conﬁrmed andﬁnalized which improved the PMT transit time spread by 25%.The signal charge was attenuated by 22.5%(13.0%)in the 10 m(5 m)cable and it required the addition of 45 V(23 V)to compensate for the loss of PMT *** was a 1%overshoot following the PMT signal and no sign of reﬂection in the connector.A group of 163-inch PMTs with the full instrumentation was installed in the JUNO prototype detector together with a few 8-inch and 20-inch PMTs,which showed good stability and demonstrated a photon detection system with multiple types of PMTs.

关键词： JUNO 3-inch PMT PMT divider TTS Signal attenuation JUNO prototype

Surface treatment technology of downhole water cut sensor

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Petroleum Exploration and Development 2022年第6期49卷 1440-1451页

作者： YANG Qinghai GAO Wei WEI Songbo YU Xiang YU Chuan SHI Bairu YANG Xingguo SHEN Qiaochu xu jilei PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China Jilin Oilfield Oil&Gas Engineering Research Institute Songyuan 138000China China University of Geosciences Beijing 100083China

Based on the structure,working principle,and working conditions of conductance water cut sensor,it is revealed that the early failure of the metal electrode of the sensor is due to the comprehensive influence of well fluid erosion,electrochemical corrosion,and oil pollution during its long-term service in the downhole.A technology for electrode surface treatment is proposed using boron-doped diamond(BDD)films to improve the service performance of the modified *** hot wire chemical vapor deposition method was adopted to fabricate BDD film,the boron doping concentration and deposition time were optimized,and fluorination treatment was applied to improve the wear resistance,electrochemical corrosion resistance,and oleophobic property of the BDD film *** results showed that BDD film with boron doping concentration of 6×10^(-3) exhibited high wear resistance and good electrochemical corrosion resistance,and endowed the modified electrode with superior erosion resistance and corrosion *** friction coefficient and wear rate of BDD modified electrode were 92%and 78%lower than those of Invar alloy,also,the low-frequency impedance modulus value of the modified electrode was higher than 1×10^(4) Ω·cm^(2).The BDD film prepared with a deposition time of 8 h had a favorable micro-nano structure owing to small grain size and uniform *** morphology was conducive to enhancing the oleophobic performance of the modified electrode,and its contact angle in the simulated well fluid was high to 102°.The engineering applicability of BDD film modified electrode under simulated working conditions indicated that,the modified electrode had excellent comprehensive performances of erosion resistance,electrochemical corrosion resistance and oil adhesion resistance,and can realize the long-term stable operation of the conductance water cut sensor under harsh downhole conditions.

关键词： water cut sensor surface treatment boron-doped diamond film wear resistance electrochemical corrosion resistance oleophobic property

纳米气泡水与沼液联合浸泡对水稻秸秆厌氧产气性能的影响

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可再生能源 2024年第5期42卷 587-591页

作者：邢帆王恩振吴兴国李玉蓉马雪杨王晓徐吉磊董仁杰郭建斌青岛汇君环境能源工程有限公司山东青岛266100 中国农业大学工学院北京100083

文章以水稻秸秆为研究对象,采用4种浸泡溶剂(去离子水、纳米气泡水、沼液、纳米气泡水联合沼液)对水稻秸秆进行5 d厌氧预处理,研究了不同浸泡预处理对挥发性脂肪酸含量、木质纤维素含量以及甲烷产率的影响。结果表明:纳米气泡水和沼液... 详细信息

文章以水稻秸秆为研究对象,采用4种浸泡溶剂(去离子水、纳米气泡水、沼液、纳米气泡水联合沼液)对水稻秸秆进行5 d厌氧预处理,研究了不同浸泡预处理对挥发性脂肪酸含量、木质纤维素含量以及甲烷产率的影响。结果表明:纳米气泡水和沼液浸泡均促进了水稻秸秆的水解过程;纳米气泡水联合沼液组的处理效果最为突出,挥发性脂肪酸含量达到了6470 mg/L,纤维素和半纤维素降解率分别达到了12.1%和23.7%,最大累积甲烷产率提高了19.5%。

关键词：水稻秸秆厌氧消化纳米气泡水浸泡预处理

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不同产地雪茄烟叶质量差异分析

天津农业科学 2024年第5期30卷 74-78页

作者：侯冰清徐继磊王海东胡延奇王以慧仇京范山东中烟工业有限责任公司山东济南250000

为探究不同产地雪茄烟叶质量特性,寻求国内外雪茄烟叶差异点,对国内外5个产地雪茄烟叶外观质量、物理特征、感官质量进行评价分析,使用多样性评价方法对香韵进行分析。结果表明:国产茄衣平整度、叶面组织、油分等指标达与多米尼加烟叶接... 详细信息

为探究不同产地雪茄烟叶质量特性,寻求国内外雪茄烟叶差异点,对国内外5个产地雪茄烟叶外观质量、物理特征、感官质量进行评价分析,使用多样性评价方法对香韵进行分析。结果表明:国产茄衣平整度、叶面组织、油分等指标达与多米尼加烟叶接近,但存在尺寸偏大,色泽均匀度、光泽不足等问题;国产雪茄烟叶厚度、拉力与多米尼加雪茄烟叶差异不显著;茄芯感官质量优于茄衣;多米尼加雪茄烟叶感官质量优于其他产地,海南产地雪茄烟叶在国产烟叶中表现最好。综上所述,国产茄衣外观质量基本达到茄衣使用需求,部分物理指标达到多米尼加烟叶水平,但需从色泽均匀度、光泽、感官质量方面进行针对性提升。

关键词：雪茄烟叶外观质量物理特性感官质量质量评价

Propeller-shaped NI isomers of cathode interfacial material for efficient organic solar cells

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Nano Research 2024年第3期17卷 1564-1570页

作者： Hao Liu jilei Jiang Shuixing Dai Liangmin Yu xu Zhang Xianbiao Hou Ke Gao Heqing Jiang Minghua Huang School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and TechnologyQingdao 266100China Science Center for Material Creation and Energy Conversion Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237China Qingdao Key Laboratory of Functional Membrane Material and Membrane Technology Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China

Cathode interfacial materials(CIMs)stand as critical elemental in organic solar cells(OSCs),which can align energy levels,and foster ohmic contacts between the cathode and active layer of the ***,the lagging advancement in CIMs has concurrently engendered the oversight of theoretical inquiries pertaining to the impact of molecular structure on their *** into this realm,we present two propeller-shaped isomers,4,4',4''-(benzo[1,2-b:3,4-b':5,6-b'']trithiophene-2,5,8-triyl)tris(2-(3-(dimethylamino)propyl)-1H-benzo[de]isoquinoline-1,3(2H)-dione)(3ONIN)and 6,6',6''-(benzo[1,2-b:3,4-b':5,6-b'']trithiophene-2,5,8-triyl)tris(2-(3-(dimethylamino)propyl)-1H-benzo[de]isoquinoline-1,3(2H)-dione)(3PNIN),distinguished by their molecular planarity,as a promising foundation for crafting highly efficient *** study illuminates the superiority of 3PNIN with more plane structure,exemplified by its enhanced molar extinction coefficient,deeper lowest unoccupied molecular orbital(LUMO)and highest occupied molecular orbital(HOMO)energy levels,intensified self-doping effect,heightened electron mobility,and elevated conductivity,in comparison to its counterpart,*** a result,3PNIN and 3ONIN-treated OSC devices yield efficiencies of 17.73%and 16.82%,*** finding serves as a compelling validation of the critical role played by molecular planarity in influencing CIM performance.

关键词： propeller-shaped molecules naphthalimide(NI)isomers cathode interfacial materials organic solar cells

Covalency competition induced selective bond breakage and surface reconstruction in manganese cobaltite towards enhanced electrochemical charge storage

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Green Energy & Environment 2024年第5期9卷 909-918页

作者： Peng Gao Pei Tang Ying Mo Peitao Xiao Wang Zhou Shi Chen Hongliang Dong Ziwei Li Chaohe xu jilei Liu College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan Province Key Laboratory for Advanced Carbon Materials and Applied TechnologyHunan UniversityChangshaHunan410082China Department of Materials Science and Engineering National University of Defense TechnologyChangshaHunan410073China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipaMacao999078China Center for High Pressure Science and Technology Advanced Research PudongShanghai201203China College of Aerospace Engineering Chongqing UniversityChongqing400044China

Manganese cobaltite(MnCo_(2)_(4))is a promising electrode material because of its attractive redox chemistry and excellent charge storage *** previous work demonstrated that the octahedrally-coordinated Mn are prone to react with the hydroxyl ions in alkaline electrolyte upon electrochemical cycling and separates on the surface of spinel to reconstruct into d-MnO_(2) nanosheets irreversibly,thus results in a change of the reaction mechanism with Kþion ***,the low capacity has greatly limited its practical ***,we found that the tetrahedrally-coordinated Co_(2) þions were leached when MnCo_(2)_(4) was equilibrated in 1 mol L^(-1) HCl solution,leading to the formation of layered CoOOH on MnCo_(2)_(4) surface which is originated from the covalency competition induced selective breakage of the CoT–O bond in CoT–O–CoO and subsequent rearrangement of free Co_(6) *** as-formed CoOOH is stable upon cycling in alkaline electrolyte,exhibits conversion reaction mechanism with facile proton diffusion and is free of massive structural evolution,thus enables utilization of the bulk electrode material and realizes enhanced speciﬁc capacity as well as facilitated charge transfer and ion *** general,our work not only offers a feasible approach to deliberate modiﬁcation of MnCo_(2)_(4)'s surface structure,but also provides an in-depth understanding of its charge storage mechanism,which enables rational design of the spinel oxides with promising charge storage properties.

关键词： Manganese cobaltite Tetrahedrally-coordinated Co^(2+)leaching Selective bond breakage Surface reconstruction Charge storage mechanisms

Muon tracking with the fastest light in the JUNO central detector

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Radiation Detection Technology and Methods 2018年第1期2卷 87-92页

作者： Kun Zhang Miao He Weidong Li jilei xu Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Background:The Jiangmen Underground Neutrino Observatory(JUNO)is a multi-purpose neutrino experiment designed to measure the neutrino mass hierarchy using a central detector(CD),which contains 20 kton liquid scintillator(LS)surrounded by about 18,000 photomultiplier tubes(PMTs),located 700 m ***:The rate of cosmic muons reaching the JUNO detector is about 3 Hz,and the muon-induced neutrons and isotopes are major backgrounds for the neutrino *** of the muon trajectory in the detector is crucial for the study and rejection of those ***:This paper will introduce the muon-tracking algorithm in the JUNO CD,with a least-squares method of PMTs’first-hit time(FHT).Correction of the FHT for each PMT was found to be important to reduce the reconstruction ***:The spatial resolution and angular resolution are better than 3 cm and 0.4 degree,respectively,and the tracking efficiency is greater than 90%up to 16 m far from the detector center.

关键词： JUNO Central detector Muon tracking First hit time Least squares method

Pd nanoparticles immobilized on graphite oxide modified with a base: Highly efficient catalysts for selective hydrogenation of citral

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Science China Chemistry 2013年第2期56卷 203-209页

作者： ZHAO YanFei ZHANG HongYe HUANG ChangLiang CHEN Sha YU Bo xu jilei LIU ZhiMin Beijing National Laboratory for Molecular Sciences Key Laboratory of Colloid Interface and Thermodynamics Institute of Chemistry Chinese Academy of Sciences

In this work, the Pd-based catalysts were designed via immobilizing Pd nanoparticles on graphite oxide (GO) modified with organic base, 1,1,3,3-tetramethylguanidine (TMG), which was used for the selective hydrogenation of citral. These catalysts were characterized by various techniques including IR, X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. It was demonstrated that the Pd particles with size less than 5 nm were uniformly distributed throughout the support, and they were in the electron-deficient state due to the strong interactions with the modified support. The resultant Pd-TMG/GO catalyst displayed high efficiency for the selective hydrogenation of citral with a turnover frequency of 7100 h-1 as well as superior selectivity to citronellal of 89.6%. Moreover, the catalyst can be reused for five times without obvious activity loss, which may result from its stable structure.

关键词：高效催化剂钯纳米粒子选择性加氢加氢改性氧化石墨柠檬醛 X-射线光电子能谱透射电子显微镜

Polymodal Functionality of C. elegans OLL Neurons in Mechanosensation and Thermosensation

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Neuroscience Bulletin 2021年第5期37卷 611-622页

作者： Yuedan Fan Wenjuan Zou Jia Liu Umar Al-Sheikh Hankui Cheng Duo Duan Du Chen Siyan Liu Luyi Chen jilei xu Firdosh Ruhomutally Lijun Kang Department of Neurobiology and Department of Neurosurgery of the First Affiliated Hospital Zhejiang University School of MedicineHangzhou 310053China NHC and CAMS Key Laboratory of Medical Neurobiology MOE Frontier Science Center for Brain Research and Brain-Machine IntegrationSchool of Brain Science and Brain MedicineZhejiang UniversityHangzhou 310053China Department of Gastroenterology Sir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou 310016China Department of Human Sciences and Psychology University of South Africa(UNISA)Pretoria 0003South Africa

Sensory modalities are important for survival but the molecular mechanisms remain challenging due to the polymodal functionality of sensory neurons. Here, we report the C. elegans outer labial lateral(OLL) sensilla sensory neurons respond to touch and cold. Mechanosensation of OLL neurons resulted in cell-autonomous mechanically-evoked Ca~(2+) transients and rapidly-adapting mechanoreceptor currents with a very short *** of OLL neurons might be carried by a novel Na~+ conductance channel, which is insensitive to amiloride. The bona fide mechano-gated Na~+ -selective degenerin/epithelial Na~+ channels, TRP-4, TMC, and Piezo proteins are not involved in this ***, OLL neurons also mediated cold but not warm responses in a cell-autonomous manner. We further showed that the cold response of OLL neurons is not mediated by the cold receptor TRPA-1 or the temperaturesensitive glutamate receptor GLR-3. Thus, we propose the polymodal functionality of OLL neurons in mechanosensation and cold sensation.

关键词： Polymodal sensory neuron Mechanosensation Thermosensation Sodium channel Cold receptor OLL neurons