本文总结了作者近年在 TEIS 方面的研究与实践,认为加快开发 TEIS 应在总结一个行业的管理经验和分析建立该行业企业模型的基础上,集中一定的人力、物力和资金,并利用 CASE 这一自动化开发 MIS 辅助工具快速地建立起一套能基本适应本行...本文总结了作者近年在 TEIS 方面的研究与实践,认为加快开发 TEIS 应在总结一个行业的管理经验和分析建立该行业企业模型的基础上,集中一定的人力、物力和资金,并利用 CASE 这一自动化开发 MIS 辅助工具快速地建立起一套能基本适应本行业通用的数据库和应用程序原型,然后再针对一个具体使用单位的特殊要求,对原型进行修改、补充,得到该单位实用的计算机应用软件。文章的最后提出了一套行之有效的加快开发 TEIS 的途径和组织措施,目的在于正确地制定系统开发策略。展开更多
目的探讨超声心动图检测Tei指数对孕中晚期子痫前期孕妇胎儿心脏功能及出生情况的影响。方法选取2022年1月—2023年10月江西省妇幼保健院收治的重度子痫前期孕妇40例作为A组,轻度子痫前期孕妇50例作为B组,选取2022年1月—2023年10月同...目的探讨超声心动图检测Tei指数对孕中晚期子痫前期孕妇胎儿心脏功能及出生情况的影响。方法选取2022年1月—2023年10月江西省妇幼保健院收治的重度子痫前期孕妇40例作为A组,轻度子痫前期孕妇50例作为B组,选取2022年1月—2023年10月同期正常孕妇35例作为C组。所有孕妇均予以超声心动图检查,比较3组孕妇新生儿心室Tei指数、心室功能指标及出生情况,采用Pearson相关性分析孕中晚期子痫前期孕妇胎儿心室Tei指数与胎儿出生情况的关系。结果与C组比较(0.25±0.02,0.28±0.02),A组和B组左室Tei指数(0.47±0.03,0.34±0.01)以及右室Tei指数(0.53±0.02,0.37±0.03)均显著上升(P<0.05),与B组比较(0.34±0.01,0.37±0.03),A组左室Tei指数(0.47±0.03)和右室Tei指数(0.53±0.02)均显著上升(P<0.05)。3组左室Tei指数和右室Tei指数比较差异有统计学意义(P<0.05)。与C组比较(64.01±8.94 ms,169.02±7.72 ms,67.44±9.76 ms,172.33±7.30 ms),A组左心室等容时间(71.25±9.80)ms及右心室等容时间(78.25±11.89)ms显著上升,左心室射血时间(162.21±5.36)ms及右心室射血时间(165.24±6.58)ms显著下降;B组右心室等容时间(74.20±10.34)ms显著上升,右心室射血时间(167.83±8.33)ms显著下降(P<0.05)。与B组比较(165.65±6.87)ms,A组左心室射血时间(162.21±5.36)ms显著下降(P<0.05)。3组心室功能指标比较差异有统计学意义(P<0.05)。与C组比较(9.21±0.05分,9.99±0.06分),A组与B组孕妇新生儿出生孕周1min Apgar评分(8.47±1.25分,9.05±0.08分)及5 min Apgar评分(9.83±0.33分,9.95±0.29分)均显著下降(P<0.05),此外,A组孕妇新生儿出生体重(2230.28±536.96)g也显著下降(P<0.05)。与B组比较(3125.37±398.54 g,37.61±1.04周,9.05±0.08分),A组新生儿出生体重(2230.28±536.96)g、出生孕周(34.53±2.14)周、1 min Apgar评分(8.47±1.25)分显著下降(P<0.05)。3组孕妇新生儿出生情况比较差异有统计学意义(P<0.05)。孕中晚期子痫前期孕妇胎儿右心室Tei指数与出生体重、出生孕周、1 min Apgar评分及5 min Apgar评分呈负相关(r=-0.528,-0.385,-0.763,-0.572,均P<0.05)。结论孕中晚期子痫前期胎儿Tei指数与孕妇疾病程度相关,且以右心室出现损伤为主,此外Tei指数与胎儿出生时Apgar评分、孕周及体重相关,有望成为预测胎儿出生情况的一个指标。展开更多
Lead-free halide perovskites provide a promising solution for efficient thermoelectric materials due to their ultralow lattice thermal conductivity(κ_(L)).However,disadvantages such as the electrically resistive natu...Lead-free halide perovskites provide a promising solution for efficient thermoelectric materials due to their ultralow lattice thermal conductivity(κ_(L)).However,disadvantages such as the electrically resistive nature strongly affect their power factor.In this work,we introduced the Te-based halide perovskites thermoelectric material Cs_(2)TeI_(6),which is already known as a promising candidate for photovoltaic applications due to its moderate band gap.Our findings reveal that Cs_(2)TeI_(6)has an exceptionally ultralow κ_(L)at room temperature,reaching as low as 0.17 W·m^(-1)·K^(-1).We found that the four-phonon scattering processes play a dominant role in suppressing the thermal transport,leading to an approximate 50% reduction in its particle-like thermal conductivity κ_(p) at 300 K.The ultralow κ_(L)can be mainly attributed to the strong discrepancy in bonding strength,which induces large anharmonicity.The flat and dense phonon dispersions result in a strong phonon scattering rate,making it easy to generate wavelike phonon tunneling.After accounting for the wavelike thermal conductivity κ_(c),a nonstandard T^(-0.30)temperature dependence was observed.Benefiting from the ultralow κ_(L),n-type Cs_(2)TeI_(6)is predicted to achieve an extraordinary ZT of 2.26 at 700 K.This work highlights a pathway for searching high-performance and low-cost thermoelectrics based on lead-free halide perovskites.展开更多
文摘目的比较加温湿化高流量鼻导管通气(heated humidified high-flow nasal cannula,HHHFNC)和经鼻持续气道正压通气(nasal continuous positive airway pressure,NCPAP)在早产儿呼吸窘迫综合征(neonatal respiratory distress syndrome,NRDS)初始治疗的疗效及对心功能的影响。方法选自徐州市中心医院2021年1月~2023年11月收治的胎龄<35周、需无创通气的早产儿NRDS进行前瞻性研究,随机分为HHHFNC组和NCPAP组,初始治疗分别采用HHHFNC和NCPAP。比较疗效、安全性及对心功能的影响。结果HHHFNC组55例,NCPAP组53例。两组给予肺表面活性剂的例数和总剂量、入组24h内呼吸暂停次数、无创通气时长、无创通气失败例数、达全肠道喂养时间、住院时长和住院费用等比较,差异均无统计学意义(P>0.05)。HHHFNC组鼻损伤率明显低于NCPAP组(0 vs 11.3%,P=0.032);两组气胸、Ⅱ~Ⅲ期坏死性小肠结肠炎、血流动力学显著异常动脉导管未闭、Ⅱ~Ⅳ级脑室内出血、支气管肺发育不良和首次筛查需要治疗的早产儿视网膜病等比较,差异均无统计学意义(P>0.05)。两组无创通气24±6h和48±6h、组间吸入氧浓度和动脉血二氧化碳分压比较,差异无统计学意义(P>0.05),组间血浆B型尿钠肽(183.9±48.5ng/L vs 187.8±51.4ng/L,189.4±50.9ng/L vs 180.2±45.1ng/L)和右室Tei指数(0.38±0.05 vs 0.40±0.06,0.38±0.06 vs 0.39±0.06)比较,差异无统计学意义(P>0.05)。结论在胎龄<35周、需要无创通气的NRDS早产儿初始治疗中,HHHFNC疗效与NCPAP相似,鼻损伤率更低。两者其他安全性指标及对心功能的影响相似。
文摘目的探讨超声心动图检测Tei指数对孕中晚期子痫前期孕妇胎儿心脏功能及出生情况的影响。方法选取2022年1月—2023年10月江西省妇幼保健院收治的重度子痫前期孕妇40例作为A组,轻度子痫前期孕妇50例作为B组,选取2022年1月—2023年10月同期正常孕妇35例作为C组。所有孕妇均予以超声心动图检查,比较3组孕妇新生儿心室Tei指数、心室功能指标及出生情况,采用Pearson相关性分析孕中晚期子痫前期孕妇胎儿心室Tei指数与胎儿出生情况的关系。结果与C组比较(0.25±0.02,0.28±0.02),A组和B组左室Tei指数(0.47±0.03,0.34±0.01)以及右室Tei指数(0.53±0.02,0.37±0.03)均显著上升(P<0.05),与B组比较(0.34±0.01,0.37±0.03),A组左室Tei指数(0.47±0.03)和右室Tei指数(0.53±0.02)均显著上升(P<0.05)。3组左室Tei指数和右室Tei指数比较差异有统计学意义(P<0.05)。与C组比较(64.01±8.94 ms,169.02±7.72 ms,67.44±9.76 ms,172.33±7.30 ms),A组左心室等容时间(71.25±9.80)ms及右心室等容时间(78.25±11.89)ms显著上升,左心室射血时间(162.21±5.36)ms及右心室射血时间(165.24±6.58)ms显著下降;B组右心室等容时间(74.20±10.34)ms显著上升,右心室射血时间(167.83±8.33)ms显著下降(P<0.05)。与B组比较(165.65±6.87)ms,A组左心室射血时间(162.21±5.36)ms显著下降(P<0.05)。3组心室功能指标比较差异有统计学意义(P<0.05)。与C组比较(9.21±0.05分,9.99±0.06分),A组与B组孕妇新生儿出生孕周1min Apgar评分(8.47±1.25分,9.05±0.08分)及5 min Apgar评分(9.83±0.33分,9.95±0.29分)均显著下降(P<0.05),此外,A组孕妇新生儿出生体重(2230.28±536.96)g也显著下降(P<0.05)。与B组比较(3125.37±398.54 g,37.61±1.04周,9.05±0.08分),A组新生儿出生体重(2230.28±536.96)g、出生孕周(34.53±2.14)周、1 min Apgar评分(8.47±1.25)分显著下降(P<0.05)。3组孕妇新生儿出生情况比较差异有统计学意义(P<0.05)。孕中晚期子痫前期孕妇胎儿右心室Tei指数与出生体重、出生孕周、1 min Apgar评分及5 min Apgar评分呈负相关(r=-0.528,-0.385,-0.763,-0.572,均P<0.05)。结论孕中晚期子痫前期胎儿Tei指数与孕妇疾病程度相关,且以右心室出现损伤为主,此外Tei指数与胎儿出生时Apgar评分、孕周及体重相关,有望成为预测胎儿出生情况的一个指标。
基金supported by the National Natural Science Foundation of China(Grant Nos.12204482 and U2330104)the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(Grant No.2020L0537)+2 种基金the Natural Science Foundation of Shanxi Province(Grant No.202403021221164)Higher Education Teaching Reform and Innovation Project of Shanxi Province(Grant No.J20220480)Graduate Curriculum Ideological and Political Education Project of Shanxi Normal University(Grant No.010520233013)。
文摘Lead-free halide perovskites provide a promising solution for efficient thermoelectric materials due to their ultralow lattice thermal conductivity(κ_(L)).However,disadvantages such as the electrically resistive nature strongly affect their power factor.In this work,we introduced the Te-based halide perovskites thermoelectric material Cs_(2)TeI_(6),which is already known as a promising candidate for photovoltaic applications due to its moderate band gap.Our findings reveal that Cs_(2)TeI_(6)has an exceptionally ultralow κ_(L)at room temperature,reaching as low as 0.17 W·m^(-1)·K^(-1).We found that the four-phonon scattering processes play a dominant role in suppressing the thermal transport,leading to an approximate 50% reduction in its particle-like thermal conductivity κ_(p) at 300 K.The ultralow κ_(L)can be mainly attributed to the strong discrepancy in bonding strength,which induces large anharmonicity.The flat and dense phonon dispersions result in a strong phonon scattering rate,making it easy to generate wavelike phonon tunneling.After accounting for the wavelike thermal conductivity κ_(c),a nonstandard T^(-0.30)temperature dependence was observed.Benefiting from the ultralow κ_(L),n-type Cs_(2)TeI_(6)is predicted to achieve an extraordinary ZT of 2.26 at 700 K.This work highlights a pathway for searching high-performance and low-cost thermoelectrics based on lead-free halide perovskites.
