DPOAE 检测在鼻咽癌患者放疗后内耳损伤研究中的应用 [PDF]
Zhongshan Daxue xuebao. Yixue kexue ban, 2002 【目的】探讨畸变产物耳声发射(DPOAE)早期发现鼻咽癌放疗后耳蜗功能损害的价值。【方法】利用Capella 型 耳声发射分析仪在放疗前、放疗中、放疗结束时、放疗后6 个月和放疗后12 个月对鼻咽癌患者的40 例耳行DPOAE 测试, 观 察其不同频率幅值的变化, 并与纯音测听的骨导听阈比较。【结果】放疗前耳蜗及中耳功能良好者, 放疗后各时期的畸变产物 耳声发射幅值虽有变化, 但与放疗前1.0 kHz[ (9.9 ±4.9) dB] , 2.0 kHz[ (-0.7 ±8.6)dB] , 4.0 ...
熊观霞 +4 more
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Study on Exergy Analysis of Mine Air-conditioner Using Ice Slurry for Latent Heat Transportation [PDF]
, 2017 针对冰浆潜热输送矿井空调系统进行了设计，提出存在峰谷电价下的井上、井下设计方案。以淮南某矿井为例，根据冰浆潜热输送深井空调功能特性，将系统分为一次侧循环系统和二次侧循环系统，采用系统火用平衡分析法，代替传统的能量平衡分析法 ...
刘腾庆, 苏林, 董凯军, 陈照杰
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Developmental Medicine &Child Neurology, Volume 61, Issue 3, Page E1-E35, March 2019., 2019 目的 本国际临床指南由欧洲残疾儿童学会（the European Academy of Childhood Disability，EACD）牵头制定，旨在解决发育性协调障碍（developmental coordination disorder，DCD）的定义、诊断、评估、干预以及与社会心理方面的临床应用关键问题。 方法 本指南针对五个领域的关键问题，通过文献综述和专家团队的正式讨论达成共识。为保证指南的循证基础，以“机制”、“评估”和“干预”为检索词, 对2012年更新以来提出的最新建议以及新增的“社会心理问题”和“青少年/成人”为检索词进行检索。根据牛津大学循证医学中心证据等级 (证据水平 [level of evidence, LOE]1–4) 将结果进行分类，最终转化为指南建议。并由国际 ...
Jing Hua +6 more
wiley +1 more source
Study on evolution law of mechanical properties of coal samples subjected to freezing and freeze-thaw cycles of liquid nitrogen [PDF]
, 2023 The permeability of coal reservoir is generally low in China, how to effectively improve the permeability of coal reservoir is a key and difficult point of coalbed methane exploitation, Liquid nitrogen fracturing technology as a kind waterless fracturing
Dongming ZHANG +6 more
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Dynamic response mechanism of initial failure of coal mass induced by in-situ stress in an outburst inoculation process of the working face for coal mining [PDF]
, 2023 There is still a great challenge to reveal the micro-macro dynamic mechanical behavior of initial coal failure induced by mining stress field in working face as a necessary condition for the outburst occurrence.
Changhang XU +4 more
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Mechanical properties and fracture damage law of coal-rock composition under the action of supercritical CO2 [PDF]
, 2023 The injection of CO2 into deep unrecoverable coal seams is one of the effective ways to achieve CO2 geological sequestration, but CO2 will be in a supercritical state under the action of high pressure and high temperature.
Jianbing YAN +6 more
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Dianci bileiqi, 2023 盆式绝缘子是GIS中重要的支撑部件，当固定它的法兰螺栓松动后，盆体会因受力不均而破裂，引起重大安全事故。文中提出一种盆式绝缘子螺栓松动检测方法，将压电传感器以一发一收的方式布置在待检测螺栓附近，通过超声信号仪激励一侧压电传感器发射超声波，并在另一侧对压电传感器接收到的信号分别进行互相关和自相关计算，获得表征螺栓松动的超声信号声时差和能量。通过实验研究了螺栓不同松动程度下信号能量和声时差的变化规律，结果表明，随着螺栓扭矩增加，超声透射信号的声时差逐渐减小、信号能量逐渐增大；当螺栓扭矩增大到一定程度后 ...
焦国勋 +7 more
doaj
Linchuang shenzangbing zazhi, 2021 目的探讨超声引导下经皮射频消融术治疗慢性肾脏病继发性甲状旁腺功能亢进（secondary hyperparathyroidism, SHPT）患者的疗效。方法选取咸阳市中心医院30例SHPT患者为研究对象,术前超声及核素扫描均证实有大于1枚增生的甲状旁腺组织,超声引导下对增生的甲状旁腺组织进行射频消融治疗,检测消融前及消融后1 d、1周、1个月、3个月及6个月骨痛评分、甲状旁腺激素、血钙、血磷、血清碱性磷酸酶水平,并观察并发症发生情况。结果消融后患者乏力、纳差、失眠、骨痛等症状好转 ...
Tian Min +8 more
doaj
Numerical Simulation And Experiment Study On Magnetoacoustic Emission with Magnetic Induction [PDF]
, 2015 铝合金板材具有高强度、低密度、强耐腐蚀、高断裂韧性和良好的高低温特性等优点，是制造宇宙飞船、运载火箭、飞机、舰船、坦克、装甲车和高速列车的主要材料。然而，由于加工工艺限制，铝合金板材在生产过程中不可避免地存在分层、夹杂、裂纹和氧化膜等缺陷。无损检测技术是一种在不破坏待测物材质与性能前提下实现构件质量检测的技术，目前已在许多领域成为确保产品质量和可靠性的强制性措施。 本文研究的感应式磁声发射无损检测方法是利用线圈在导体感应出的涡流在静态磁场的作用下会受到洛仑兹力的作用使导体发生机械振动，进而产生磁声信号 ...
李超
core
Analysis of mechanical properties, permeability and fracturing mechanism of coal samples at different fracturing time of liquid nitrogen [PDF]
, 2023 In order to study the influence of liquid nitrogen cracking time on mechanical properties and permeability of coal samples, the independently developed WYS-800 triaxial gas seepage test device and acoustic emission detection system were used to conduct ...
Hao WANG +5 more
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