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短波发射机的技术维护管理措施分析

血管内治疗鼻咽癌放疗后颈内动脉假性动脉瘤破裂出血

中国科技纵横 2024年第10期 73-75页

作者：赤来拉珍西藏自治区广播电视局092台西藏日喀则 857800

广播播出需要微波信号的传递,然而,微波信号传递过程中经常出现通道故障、信号弱、发射机异常、推动信号不稳定等一系列问题,导致广播质量整体偏低.在日常管理工作中,发射机使用单位应该进行定期维护和检查工作,确保其正常运行.本文基... 详细信息

广播播出需要微波信号的传递,然而,微波信号传递过程中经常出现通道故障、信号弱、发射机异常、推动信号不稳定等一系列问题,导致广播质量整体偏低.在日常管理工作中,发射机使用单位应该进行定期维护和检查工作,确保其正常运行.本文基于短波发射机的维护原则,重点分析了发射机的常见故障种类,提出了有效的维修管理对策以及其他保障性措施,希望可以为相关研究人员提供借鉴与参考.

关键词：短波发射机技术维护管理措施

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介入放射学杂志 2024年第3期33卷 304-308页

作者：申权郑曲彬谢杭池桢黄宁福建医科大学附属协和医院介入科福建福州350001

目的探讨鼻咽癌放疗后颈内动脉假性动脉瘤破裂出血的血管内治疗方式、疗效及安全性。方法回顾性分析福建医科大学附属协和医院收治的21例鼻咽癌放疗后颈内动脉假性动脉瘤破裂出血患者的临床资料,其中8例行覆膜支架植入,6例行支架辅助... 详细信息

目的探讨鼻咽癌放疗后颈内动脉假性动脉瘤破裂出血的血管内治疗方式、疗效及安全性。方法回顾性分析福建医科大学附属协和医院收治的21例鼻咽癌放疗后颈内动脉假性动脉瘤破裂出血患者的临床资料,其中8例行覆膜支架植入,6例行支架辅助弹簧圈栓塞,7例直接行载瘤动脉闭塞治疗。分析手术策略、治疗结果以及临床与影像学随访结果。结果 21例患者均成功接受血管内治疗。术后即刻止血效果均良好,瘤颈残留2例,瘤体残留1例。术后出血复发5例,其中4例再次行载瘤动脉闭塞后出血停止,1例为覆膜支架植入后发生内漏,予球囊扩张后血止,但1个月后不明原因死亡;1例覆膜支架植入术后出现昏迷,CT示蛛网膜下腔出血、脑肿胀,治疗后未好转自动出院;3例在随访中发现颈内动脉闭塞;2例术后未随访。随访的19例患者中mRS评分0分9例,1分6例,2分2例,5分1例,6分1例。结论针对鼻咽癌放疗后颈内动脉假性动脉瘤破裂出血,血管内治疗效果确切,安全性较高。覆膜支架短期疗效好,但也存在着动脉瘤复发、内漏等问题,载瘤动脉闭塞可能远期疗效更可靠。

关键词：鼻咽癌放疗颈内动脉假性动脉瘤血管内治疗

钙钛矿型CeTaN_(2)O的高压制备及其磁性和电学性质

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物理学报 2024年第8期73卷 83-89页

作者：陈兆亮卢达标叶旭斌赵浩婷张杰潘昭迟振华崔田沈瑶龙有文宁波大学物理科学与技术学院高压物理科学研究院宁波315211 中国科学院物理研究所北京凝聚态物理国家研究中心北京100190 中国科学院大学物理科学学院北京100049 中国科学院合肥物质科学研究院等离子体物理研究所合肥230031 松山湖材料实验室东莞523808

最近研究发现,AB(N,O)_(3)型钙钛矿氧氮化物具有优异的介电、铁电、光催化等性能,在光电子、能源存储和通信等领域展现出广阔的应用前景.但是,目前该类型材料的制备工艺耗时较长且产物纯度较低.本文以氧化物为前驱体、以氨基钠为氮源,... 详细信息

最近研究发现,AB(N,O)_(3)型钙钛矿氧氮化物具有优异的介电、铁电、光催化等性能,在光电子、能源存储和通信等领域展现出广阔的应用前景.但是,目前该类型材料的制备工艺耗时较长且产物纯度较低.本文以氧化物为前驱体、以氨基钠为氮源,利用六面顶压机设备所提供的高温高压环境成功制备了高纯度的钙钛矿型氧氮化物CeTaN_(2)O块体材料,并将制备时间缩短至1 h,实现了快速合成.并对其晶体结构以及物理性质进行了系统的研究.X射线粉末衍射实验和Rietveld精修结果表明,所制备的样品属于正交晶系,空间群为Pnma.X射线吸收谱测试确定了样品的电荷组态以及阴离子组合为Ce^(3+)Ta^(5+)N_(2)O.磁性和比热测试表明,样品属于反铁磁物质,磁相变温度低于2 K.电学输运性能测试表明,样品的电阻率呈现出典型的半导体行为,且符合三维变程跳跃模型.

关键词：高压合成钙钛矿氮化物反铁磁半导体

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基于模糊数学感官评价法优化营养复配预熟糙米粉配方工艺

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中国调味品 2024年第5期49卷 106-112页

作者：关桦楠迟振东吴永存陈彦宇哈尔滨商业大学食品工程学院哈尔滨150028

该研究以微波冻干处理后的发芽糙米粉为原料,以吸水指数和水溶指数结合模糊数学感官评分为指标,研究黑豆粉、抗性糊精和赤藓糖醇的添加量对营养复配预熟化发芽糙米粉品质的影响,并对复配发芽糙米粉的营养特性、卫生指标和贮藏稳定性进... 详细信息

该研究以微波冻干处理后的发芽糙米粉为原料,以吸水指数和水溶指数结合模糊数学感官评分为指标,研究黑豆粉、抗性糊精和赤藓糖醇的添加量对营养复配预熟化发芽糙米粉品质的影响,并对复配发芽糙米粉的营养特性、卫生指标和贮藏稳定性进行分析。研究结果表明,营养复配发芽糙米粉的最优配方为黑豆粉添加量20%、抗性糊精添加量8%、赤藓糖醇添加量4%。复配糙米粉营养价值提高,卫生指标符合国家标准,在贮藏120 d后新鲜度变差但仍高于原粮糙米。

关键词：发芽糙米模糊数学感官评价微波预熟营养复配糙米粉

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Unveiling Defect-Mediated Carrier Dynamics in Few-Layer MoS2 Prepared by Ion Exchange Method via Ultrafast Vis-NIR-MIR Spectroscopy

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chinese Journal of Chemical Physics 2020年第5期33卷 547-553,I0001-I0005,I0078页

作者： zhen chi Hui-hui Chen Zhuo Chen Hai-long Chen The Laboratory of Soft Matter Physics Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Materials Physics and Chemistry Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green ApplicationsSchool of Materials Science and EngineeringBeijing Institute of Technology InstitutionBeijing 100081China Institute of Photo-biophysics School of Physics and ElectronicsHenan UniversityKaifeng 475004China Songshan Lake Materials Laboratory Dongguan 523808China

Defect-mediated processes in two-dimensional transition metal dichalcogenides have a significant influence on their carrier dynamics and transport properties,however,the detailed mechanisms remain poorly ***,we present a comprehensive ultrafast study on defect-mediated carrier dynamics in ion exchange prepared few-layer MoS2 by femtosecond time-resolved Vis-NIR-MIR *** broadband photobleaching feature observed in the near-infrared transient spectrum discloses that the mid-gap defect states are widely distributed in few-layer MoS2 *** processes of fast trapping of carriers by defect states and the following nonradiative recombination of trapped carriers are clearly revealed,demonstrating the mid-gap defect states play a significant role in the photoinduced carrier *** positive to negative crossover of the signal observed in the mid-infrared transient spectrum further uncovers some occupied shallow defect states distributed at less than0.24 e V below the conduction band *** defect states can act as effective carrier trap centers to assist the nonradiative recombination of photo-induced carriers in few-layer MoS2 on the picosecond time scale.

关键词： Two-dimensional materials Ultrafast spectroscopy Defect states Carrier dynamics

Compact broadband high-resolution Compton spectroscopy for laser-driven high-flux gamma rays

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Matter and Radiation at Extremes 2021年第1期6卷 5-14页

作者： zhen-chi Zhang Tao Yang Guang-Yue Hu Meng-Ting Li Wen Luo Ning An Jian zheng CAS Key Laboratory of Geospace Environment and Department of Engineering and Applied Physics University of Science and Technology of ChinaHefeiAnhui 230026China CAS Center for Excellence in Ultra-Intense Laser Science(CEULS) Shanghai 200031China School of Nuclear Science and Technology University of South ChinaHengyang 421001China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefeiAnhui 230026China Anhui Specreation Instrument Technology Co. Ltd.HefeiAnhui 230088China Collaborative Innovation Center of IFSA(CICIFSA) Shanghai Jiao Tong UniversityShanghai 200240China

A compact broadband Compton spectrometer with high spectral resolution has been designed to detect spectra of laser-driven high-flux gamma *** primary detection range of the gamma-ray spectrum is 0.5 MeV–13 MeV,although a secondary harder gamma-ray region of 13 MeV–30MeV can also be *** Compton-scattered electrons are spectrally resolved using a curved surface detector and a nonuniform magnetic field produced by a pair of step-like *** design allows a compact structure,a wider bandwidth,especially in the lower-energy region of 0.5 MeV–2 MeV,and optimum spectral *** spectral resolution is 5%–10%in the range 4 MeV–13 MeV and better than 25%in the range 0.5MeV–4MeV(with an Al converter of 0.25mmthickness and a collimator of 1 cm inner diameter).Low-Z plastic materials are used on the inner surface of the spectrometer to suppress noise due to secondary X-ray *** spectrometer can be adjusted flexibly via a specially designed mechanical *** algorithmbased on a regularizationmethod has also been developed to reconstruct the gamma-ray spectrum from the scattered electrons.

关键词： resolution scattered inner

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7075铝合金接触固溶工艺参数优化

塑性工程学报 2024年第8期31卷 100-106页

作者：刘持振安保芹解焕阳杨茴茴朱伟东张志强凌云吉恩斯科技有限公司热成形技术研究分院山东烟台264000 上海凌云工业科技有限公司凌云中央研究院上海201708 吉林大学材料科学与工程学院吉林长春130015

为探索接触固溶过程中实验参数对7075铝合金成形件性能的影响,以7075-T6铝合金板材为研究对象,首先进行了接触固溶成形实验,获得了不同实验参数下的成形件并分别进行性能测定。然后采用响应面法分析了接触固溶温度、固溶时间和接触压强... 详细信息

为探索接触固溶过程中实验参数对7075铝合金成形件性能的影响,以7075-T6铝合金板材为研究对象,首先进行了接触固溶成形实验,获得了不同实验参数下的成形件并分别进行性能测定。然后采用响应面法分析了接触固溶温度、固溶时间和接触压强对零件洛氏硬度、抗拉强度和断后伸长率的影响,并根据实验数据,采用遗传算法进行多目标优化,得到满足多性能要求的工艺参数,确定了符合要求的优化解。结果表明,在接触固溶温度为475℃、固溶时间为32 s,接触压强为13 MPa时,可以获得同时保证多个综合性能的最优解。

关键词： 7075铝合金热冲压接触固溶响应面法多目标优化

Change of intestinal mucosa barrier function in the progress of non-alcoholic steatohepatitis in rats

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World Journal of Gastroenterology 2008年第20期14卷 3254-3258页

作者： Sheng Li Wan-Chun Wu chi-Yi He zhen Han Dao-You Jin Lin Wang Department of Gastroenterology YijishanHospital Wannan Medical College Wuhu 241001 AnhuiProvince China

AIM: To explore the change of intestinal mucosa barrier function in the progress of non-alcoholic steatohepatitis (NASH) in rats. METHODS: Thirty-two Sprague-Dawley (SD) rats were randomly divided into control group and model group. Rats in the control group were given normal diet, and rats in the model group were given fat-rich diet. Eight rats in each group were killed at end of the 8th and 12th wk, respectively. The levels of endotoxin, D-xylose, TG, TC, ALT and AST, intestinal tissue SOD and MDA as well as intestinal mucus secretory IgA (sIgA) were measured. The pathology of liver was observed by HE staining. RESULTS: At end of the 8th wk, there was no marked difference in the levels of endotoxin, D-xylose and sIgA between the two groups. At end of the 12th wk, rats in the model group developed steatohepatitis and had a higher serum level of endotoxin (P = 0.01) and D-xylose (P = 0.00) and a lower serum level of sIgA (P = 0.007). CONCLUSION: Intestinal mucosa barrier malfunction may exist in NASH rats and may be an important promoter of NASH in rats.

关键词： Non-alcoholic steatohepatitis Intestinalmucosa barrier Endotoxin Secretory IgA

Oral tolerance therapy in type 1 diabetes mellitus

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chinese Medical Journal 2021年第1期134卷 44-46页

作者： Rui-Feng Mao Ying-Ying Chen En-Jie Diao Xin Chang zhen-Jing chi Ye-Fu Wang Jiangsu Collaborative Innovation Center of Regional Modern Agriculture&Environmental Protection School of Life ScienceHuaiyin Normal UniversityHuai’anJiangsu 223300China Department of Ultrasound Medicine Nanjing Lishui People’s HospitalZhongda Hospital Lishui BranchSoutheast UniversityNanjingJiangsu 211200China Huai’an First People’s Hospital Nanjing Medical UniversityHuai’anJiangsu 223300China State Key Laboratory of Virology College of Life SciencesWuhan UniversityWuhanHubei 430072China

Type 1 diabetes mellitus(T1DM),an autoimmune disorder,is marked by T cell-mediated destruction of theβcells of the pancreas,which leads to an almost complete loss of the ability to synthesize insulin.[1]This insulin deficiency results in loss of the ability to regulate blood sugar,therefore,exogenous insulin administration is necessary for patients to control blood sugar and to reduce the incidence of related chronic diabetic complications.[2]In addition,a positive correlation between diabetes mellitus and hypertension has been detected.[3]

关键词： mellitus diabetes sugar