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Preparation of CdTe nanocrystal-polymer composite microspheres in aqueous solution by dispersing method

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Chinese Science Bulletin 2005年第7期50卷 621-625页

作者： LIMinjie WANGChunlei HANKun yangbai KeyLaboratoryforSupramolecularStructureandMaterials DepartmentofChemistryJilinUniversityChangchun130012China

Highly fluorescent CdTe nanocrystals were synthesized in aqueous solution, and then processible CdTe nanocrystal-polymer composites were fabricated by coating the aqueous nanocrystals with copolymers of styrene and octadecyl-p-vinyl-benzyldimethylammonium chloride (SOV- DAC) directly. A dichloromethane solution of CdTe nano- crystal-polymer composites was dispersed in the aqueous solution of poly (vinyl alcohol) (PVA) generating highly fluo- rescent microspheres. Experimental parameters such as the concentration of nanocrystal-polymer composites, the con- centration of PVA, and stirring speed which had important effect on the preparation of the microspheres were investi- gated in detail with fluorescent microscope characterization.

关键词：微晶聚合物 CdTe 碲镉水溶液荧光性半导体

Two-substrate vertical deposition for stable colloidal crystal chips

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Chinese Science Bulletin 2005年第8期50卷 765-769页

作者： CHENXin SUNZhiqiang CHENZhimin ZHANGKai yangbai KeyLaboratoryforSupramolecularStructure&Materials DepartmentofChemistryJilinUniversityChangchun130012China

By combining vertical deposition with micro- molding in capillaries method, we have demonstrated the two-substrate vertical deposition, an alternative and versatile procedure for fabricating high-quality stable colloidal crystal chips. Apparent bright colors, special UV-vis spectra, scan- ning electron microscopy (SEM) and atomic force micros- copy (AFM) images all prove that high-quality colloidal crystal structures are formed in between the two substrates. During the two-substrate vertical deposition for colloidal crystal chips, capillary force and evaporation of the medium are critical to the formation of the colloidal crystals; while the confinement in between two close substrates makes the resulting colloidal crystal chips more stable. Due to the ex- cellent stability, these colloidal crystal chips can be used to construct some composite optical devices via a simpler and more flexible process. Meanwhile, they can also be further used as the templates for ordered multiporous materials.

关键词：胶状结晶芯片模板电子扫描显微镜

Synthesis and properties of water-soluble oligo-(p-phenylkene vinylene)

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Chinese Science Bulletin 2003年第20期48卷 2168-2170页

作者： TANGJun YUXiaoqiang LINWeiran SUNJingzhi yangbai KeyLaboratoryofSupramolecularStructureandMaterials JilinUniversityChangchun130023China StateKeyLaboratoryofCrystalMaterials ShandongUniversityJinan250100China

A water-soluble oligo(p-phenylkene vinylene) [4,4′-(1,4-phenylene dithenylene)-bis-(N-methyl pyridinium iodide)] was synthesized by Witting reaction. The oligomer was characterized by NMR, elemental analysis, UV-visi... 详细信息

关键词：水溶性低聚p-苯基亚乙烯荧光光谱光电谱表面结构

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牵引变电所高压电缆环流监测系统应用研究

电力系统装备 2024年第6期 32-35页

作者：马阳柏王延国杨海波中铁武汉电气化局集团有限公司第二工程分公司四川成都610000 北京杜朗自动化系统技术有限公司北京100194

针对电缆环流、局放问题对牵引供电系统造成的安全问题,文章提出了一种创新性监测系统,旨在实时监测电缆环流、电缆局放等关键运行参数。该监测系统采用先进的传感技术和数据分析算法,能够准确捕获电缆运行过程中的异常情况并立即发出警... 详细信息

针对电缆环流、局放问题对牵引供电系统造成的安全问题,文章提出了一种创新性监测系统,旨在实时监测电缆环流、电缆局放等关键运行参数。该监测系统采用先进的传感技术和数据分析算法,能够准确捕获电缆运行过程中的异常情况并立即发出警报,提醒运维人员采取相应的措施。该系统不仅能够有效降低电力装备发生故障的风险,还能够最大程度地保障供电系统的稳定运行,从而保障铁路、城市轨道交通等领域的正常运营,具有广泛的推广应用价值。

关键词：高压电缆电缆环流电缆局放实时监测

A new three-layer-funnel-shaped esophagogastric anastomosis for surgical treatment of esophageal carcinoma

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World Journal of Gastroenterology 2003年第1期9卷 22-25页

作者： Han-LeiDan yangbai HuiMeng JieZhang YongZhang Ya-LiZhang Zhen-ShuZhang Dian-YuanZhou ResearchInstituteofDigestiveDisease SouthHospital.FirstMilitarvMedicalUniversity.Guangzhou510515.GuangdongProvinceChina DepartmentofCardio-ThoracicSurgery SouthHospitalFirstMilimr\MedicalUniversity.Guangzhou510515.GuangdongProvinceChina DepartmentofSurgery.No.520Hospital MianyangCity621000SichanProvinceChina YantingOncologyResearchInstitute YantingCounty621042.SichuanProvinceChina DepartmentofCardio-ThoracicSurgery PearlRiverHospitalGuangzhou510282GuangdongProvinceChina

AIM: To reduce the incidence of postoperative anastomoticleak, stenosis, gastroesophageal reflux (GER) for patientswith esophageal carcinoma, and to evaluate the conventionalmethod of esophagectomy and esophagogastroplastymodified by a new three-layer-funnel-shaped (TLF)esophagogastric anastomotic suturing ***: From January 1997 to October 1999, patientswith clinical stage Ⅰ and Ⅱ (Ⅱa and Ⅱb) esophagealcarcinoma, which met the enrollment criteria, were surgicallytreated by the new method (Group A) and by conventionaloperation (Group B). All the patients were followed at leastfor 6 months. Postoperative outcomes and complicationswere recorded and compared with the conventional methodin the same hospitals and with that reported previously byMcLarty etalin 1997 (Group C).RESULTS: 58 cases with stage Ⅰ and Ⅱ (Ⅱa and Ⅱb)esophageal carcinoma, including 38 males and 20 femalesaged from 34 to 78 (mean age: 57), were surgically treatedby the TLF anastomosis and 64 by conventional method inour hospitals from January 1997 to October 1999. The qualityof swallowing was improved significantly (Wilcoxon W＝2 142,P＝0.0 001) 2 to 3 months after the new operation in GroupA. Only one patient had a blind anastomatic fistula diagnosedby barium swallow test 2 months but healed up 3 weekslater. Postoperative complications occurred in 25 (43 %)patients, anastomotic stenosis in 8 (14 %), and GER in 13(22 %). The incidences of postoperative anastomotic leak,stenosis and GER were significantly decreased by the TLFanastomosis method compared with that of conventionalmethods (x2＝6.566, P ＝0.038; x2＝10.214, P＝ 0.006;x2＝21.265, P＝0.000).CONCLUSION: The new three-layer-funnel-shapedesophagogastric anastomosis (TLFEGA) hasmore advantagesto reduce postoperative complications of anastomotic leak,stricture and GER.

关键词：食管癌外科治疗食管胃吻合术围手术期手术方法

Expression of Helicobacter pyloriAlpA protein and its immunogenicity

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World Journal of Gastroenterology 2005年第15期11卷 2260-2263页

作者： JingXue yangbai YeChen Ji-DeWang Zhao-ShanZhang Ya-LiZhang Dian-YuanZhou PLAInstituteforDigestiveMedicine NanfangHospitalTheFirstMilitaryMedicalUniversityGuangzhou510515GuangdongProvinceChina InstituteofBiotechnology AcademyofMilitaryMedicalSciencesBeijing100071China

AIM:To construct a recombinant strain which expresses adhesin AlpA of Helicobacter pylori (H pylori) and to study the immunogenicity of adhesin AlpA. METHODS: Gene Ab, which was amplified from H pylori chromosomal DNA by PCR technique, was sequenced and the biological information was analyzed, and inserted into the Nco I and Not I restriction fragments of the expression vector pET-22b(+) using T4 DNA ligase. The resulting plasmid pET-AlpA was transformed into competent *** BL21(DE3) cells using ampicillin resistance for selection. Recombinant strains were incubated in 5 mL LB with 100 μg/mL ampicillin overnight at 37 ℃. Sonication of BL21(DE3)pET-22b(+)/AlpA was analyzed by Western blot to detect AlpA immunogenicity. RESULTS: The gene encoding AlpA protein was amplified by PCR with chromosomal DNA of H pylori Sydney strain (SS1) as templates. It revealed that AlpA DNA fragment amplified by PCR had approximately 1 500 nucleotides, compatible with the previous reports. The recombinant plasmid pET-22b(+)/AB was successfully constructed. DNA sequencing showed one open reading frame with the length of 588 bp. It encoded seven conservative regions that showed good antigenicity and hydrophobicity by Parker and Welling method. Furthermore, INTERNET EXPASY, NNPREDICT and ISREC predicted that it was a porin-like structure consisting of β-pleated sheets that were embedded in the outer membrane. BLAST analyzed 836 767 protein sequences and found that the similar sequences were all belonging to H pylori OMP sequences. SDS-PAGE and scan analysis showed that the molecular weight of AB was 22.5 ku and recombinant protein amounted to 29% of the total bacterial protein, among which dissolved expression amounted to 21.9% of sonicated supernatant. The rAB purity amounted to 96% through affinity chromatography. Western blot analysis of rAB confirmed that it could be specially recognized by serum form rabbit immunized with AlpA and H pylori infected. CONCLUSION: Adhesin AlpA recombina

关键词： H pylori Immunogenicity

油气行业作业人员不安全行为智能预警方法探讨

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世界石油工业 2024年第2期31卷 83-90页

作者：胡瑾秋陈传刚吴明远胡洋柏中国石油大学(北京)安全与海洋工程学院北京102249 油气生产安全与应急技术应急管理部重点实验室北京102249

油气行业涉及领域广,从业人员在作业过程中通常面临复杂的生产工艺、恶劣的工作环境及高强度的工作状态等,油气行业事故发生率常年居高不下,其中人为失误等事故原因所占比例超过70%。实现油气行业作业人员不安全行为的智能预警,对于减... 详细信息

油气行业涉及领域广,从业人员在作业过程中通常面临复杂的生产工艺、恶劣的工作环境及高强度的工作状态等,油气行业事故发生率常年居高不下,其中人为失误等事故原因所占比例超过70%。实现油气行业作业人员不安全行为的智能预警,对于减少油气行业事故的发生具有重要意义。油气行业作业人员的不安全行为主要包括错误行为与安全隐患行为。针对作业人员的不安全行为识别和预警,目前主要采用人员检查、事后分析及视频监控等方法,但是上述方法分别存在无法实时识别作业人员的错误行为,无法识别和预警作业人员的安全隐患行为等。视线追踪技术是通过捕捉作业人员的注视点与注视时间的变化过程,从而判断作业人员当前工作状态的一项技术。该技术具有反应灵敏、准确度高、无死角与可穿戴等特点,在医疗健康、交通安全、心理学等领域均已有较好的应用。利用视线追踪技术在人员状态监测等方面的优势,将其引入到油气行业作业人员不安全行为的识别或预警方法研究,用以探讨在该领域实现作业人员不安全行为智能预警的可行性。

关键词：油气行业作业人员不安全行为视线追踪智能预警

Discussion on the dissociation of fast HD_2^+ ions traversing thin foils

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原子与分子物理学报 2003年第2期20卷 187-190,196页

作者： ZHUZhou-sen MIAOJing-wei yangbai-fang SHIMian-gong InstituteofElectronicEngineeringofSichuanNormalUniveraity Chengdu610082P.R.ofChina InstituteofNuclearscienceandTechnologyofSichuanUniveraity Chengdu610066P.R.ofChina

the discussion is on the following experimental results: The energy distribution of the H + and D + fragments resulting from the dissociation of HD + 2 molecular ions at energy 1.497 7 MeV has been measured using the Coulomb explosion technique. The spectra were used to determine the binding energy of HD + 2 and its structure. There existed differences between the spectral structures for proton and for deuteron.

关键词： HD^+2 氢离子氘离子电离化学结构不对称光谱分析

The strong wake effect and asymmetry structure for HD_2^+ using the coulomb explosion technique

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原子与分子物理学报 2004年第1期21卷 15-18页

作者： ZHUZhou-sen MIAOJing-wei YANGJia-quan yangbai-fang SHIMian-gong InstituteofElectronicEngineeringofSichuanNormalUniversity Chengdu610082P.R.China InstituteofNuclearScienceandTechnologyofSichuanUniversity Chengdu610064P.R.China

Through measuring the energy distributions of H+ and D+ fragments for HD+2 beam incident on carbon foils at energy 1.4977 MeV, a very large ‘wake effect’ has been found and the structure of HD+2 has been determined. The result shows an asymmetry configuration for HD+2. It agrees with other experimental results and support several assumptions.

关键词：分子物理学不对称结构能量分布氘离子库仑扩展技术氢离子