The nondestructive testing of anti slide pile usually adopts low strain method, high strain method and acoustic transmission method. Low strain detection method is very effective in finding major defects, but it is no...The nondestructive testing of anti slide pile usually adopts low strain method, high strain method and acoustic transmission method. Low strain detection method is very effective in finding major defects, but it is not foolproof;In revealing the integrity of piles, mutual comparison can better explain the problem. The test results can only be used as a reference for the determination of pile defects, and the pile cannot be determined as unqualified only by the results of integrity test. The inspector must fully grasp the pile foundation construction and geological conditions in order to make the most reasonable interpretation of the test results.展开更多
背景股骨头坏死患者常处于青壮年,如果不及时治疗,会快速进展,发生股骨头的塌陷,严重影响工作生活,最终需要接受全髋关节置换。目的观察早期股骨头坏死标本不同区域微观结构,研究其内部结构变化规律,为早期股骨头坏死的治疗提供指导。...背景股骨头坏死患者常处于青壮年,如果不及时治疗,会快速进展,发生股骨头的塌陷,严重影响工作生活,最终需要接受全髋关节置换。目的观察早期股骨头坏死标本不同区域微观结构,研究其内部结构变化规律,为早期股骨头坏死的治疗提供指导。方法收集2019年3月-2020年1月因股骨头坏死于解放军总医院第一医学中心行全髋关节置换术患者的10个股骨头标本,其中女性5例,男性5例,年龄41~66岁,平均52岁。术前起病时间3~24个月,平均9.5个月。根据改良的国际骨循环研究学会(ARCO)分期标准,放射学分期均为Ⅱ期。将骨坏死标本沿冠状位切成厚约2 mm切片,采用micro-CT、高精度X线检查、病理学等方法研究股骨头坏死不同区域内部结构变化规律。结果通过micro-CT及病理切片染色发现早中期股骨头坏死标本软骨下骨正常的屏障作用减退或消失,部分区域有新生血管侵入,坏死区骨小梁结构完整性消失,骨小梁表面新生骨较少,且存在大量空骨陷窝。硬化区骨小梁数量和厚度均明显增加,新生类骨质较多,硬化区成骨相对于坏死区和正常区更为活跃。骨计量参数统计分析显示硬化区骨矿密度(bone mineral density,BMD)(mg/cc)(202.83±38.95 vs 79.00±24.50和102.12±17.44)、骨体积分数(bone volume fraction,BV/TV)(50.35%±7.40%vs 29.14%±8.80%和33.68%±5.70%)相对于坏死区和正常区明显增加(P均<0.05)。同时坏死修复反应区血管面积也较坏死区和正常区明显增加(P<0.05)。结论早中期股骨头坏死已发生软骨下骨屏障作用减退。坏死区保留死骨,改变成骨方式,对于早中期骨坏死的治疗及塌陷的预防具有积极意义。展开更多
Amyloidosis is a multisystem disease that is characterized by deposition of fibrils in extracellular tissue,which mainly involves the kidney,heart,and autonomic nervous system.Two types of amyloidosis typically infilt...Amyloidosis is a multisystem disease that is characterized by deposition of fibrils in extracellular tissue,which mainly involves the kidney,heart,and autonomic nervous system.Two types of amyloidosis typically infiltrate the heart,including immunoglobulin light-chain(AL)and amyloid transthyretin(ATTR).ATTR is further subdivided into wild-type ATTR and variant ATTR caused by point mutations in the TTR gene.[1]Wild-type ATTR is considered as not uncommon in older patients with heart failure.Recently,a comprehensive set of consensus recommendations for the suspicion and diagnosis of ATTR was published,with particular focus on the combined application of noninvasive methods.[2]We present here a case of wild-type TTR cardiac amyloidosis(ATTRwt-CA),which was diagnosed by noninvasive modalities,and provide an overview of the recommended diagnostic approach of CA.Furthermore,to the best of our knowledge,this is the first Chinese case of ATTRwt-CA reported to date.展开更多
A novel strategy to synthesize copper-based nanoparticles supported on carbon nitride(C3 N4) was developed by popping of mixture containing C3 N4 and cupric nitrate. Characterizations such as X-ray photoelectron spect...A novel strategy to synthesize copper-based nanoparticles supported on carbon nitride(C3 N4) was developed by popping of mixture containing C3 N4 and cupric nitrate. Characterizations such as X-ray photoelectron spectroscopy(XPS) and X-ray diffraction(XRD) indicate that the structure of g-C3 N4 maintained although a popping process occurred. High resolution transmission electronic microscopy(HRTEM) characterization illustrated that copper-based nanoparticles with diameter of < 1 nm were well distributed on g-C3 N4. This kind of copper catalyst exhibits high catalytic activity and selectivity in arylation of pyrazole, a simple and effect strategy to construct C-N bond in organic chemistry.According to the results of control experiments and characterizations, cuprous oxide should be the catalytic active phase in the supported coperbased catalyst.展开更多
文摘The nondestructive testing of anti slide pile usually adopts low strain method, high strain method and acoustic transmission method. Low strain detection method is very effective in finding major defects, but it is not foolproof;In revealing the integrity of piles, mutual comparison can better explain the problem. The test results can only be used as a reference for the determination of pile defects, and the pile cannot be determined as unqualified only by the results of integrity test. The inspector must fully grasp the pile foundation construction and geological conditions in order to make the most reasonable interpretation of the test results.
文摘背景股骨头坏死患者常处于青壮年,如果不及时治疗,会快速进展,发生股骨头的塌陷,严重影响工作生活,最终需要接受全髋关节置换。目的观察早期股骨头坏死标本不同区域微观结构,研究其内部结构变化规律,为早期股骨头坏死的治疗提供指导。方法收集2019年3月-2020年1月因股骨头坏死于解放军总医院第一医学中心行全髋关节置换术患者的10个股骨头标本,其中女性5例,男性5例,年龄41~66岁,平均52岁。术前起病时间3~24个月,平均9.5个月。根据改良的国际骨循环研究学会(ARCO)分期标准,放射学分期均为Ⅱ期。将骨坏死标本沿冠状位切成厚约2 mm切片,采用micro-CT、高精度X线检查、病理学等方法研究股骨头坏死不同区域内部结构变化规律。结果通过micro-CT及病理切片染色发现早中期股骨头坏死标本软骨下骨正常的屏障作用减退或消失,部分区域有新生血管侵入,坏死区骨小梁结构完整性消失,骨小梁表面新生骨较少,且存在大量空骨陷窝。硬化区骨小梁数量和厚度均明显增加,新生类骨质较多,硬化区成骨相对于坏死区和正常区更为活跃。骨计量参数统计分析显示硬化区骨矿密度(bone mineral density,BMD)(mg/cc)(202.83±38.95 vs 79.00±24.50和102.12±17.44)、骨体积分数(bone volume fraction,BV/TV)(50.35%±7.40%vs 29.14%±8.80%和33.68%±5.70%)相对于坏死区和正常区明显增加(P均<0.05)。同时坏死修复反应区血管面积也较坏死区和正常区明显增加(P<0.05)。结论早中期股骨头坏死已发生软骨下骨屏障作用减退。坏死区保留死骨,改变成骨方式,对于早中期骨坏死的治疗及塌陷的预防具有积极意义。
基金the National Key Research and Development Program of China(2016YFC0901500).
文摘Amyloidosis is a multisystem disease that is characterized by deposition of fibrils in extracellular tissue,which mainly involves the kidney,heart,and autonomic nervous system.Two types of amyloidosis typically infiltrate the heart,including immunoglobulin light-chain(AL)and amyloid transthyretin(ATTR).ATTR is further subdivided into wild-type ATTR and variant ATTR caused by point mutations in the TTR gene.[1]Wild-type ATTR is considered as not uncommon in older patients with heart failure.Recently,a comprehensive set of consensus recommendations for the suspicion and diagnosis of ATTR was published,with particular focus on the combined application of noninvasive methods.[2]We present here a case of wild-type TTR cardiac amyloidosis(ATTRwt-CA),which was diagnosed by noninvasive modalities,and provide an overview of the recommended diagnostic approach of CA.Furthermore,to the best of our knowledge,this is the first Chinese case of ATTRwt-CA reported to date.
基金supported the following funders: One Hundred Talent Project of Hebei Province (Grant No. E2016100015)National Natural Science Foundation of China (No. 21773053)+2 种基金Hebei provincial Natural Science Foundation (No. B2017201084)Hebei Provincial Technology Foundation for High-level talents (No. CL201601)the science technology research and development guidance program project of Baoding City (No. 16ZF027)
文摘A novel strategy to synthesize copper-based nanoparticles supported on carbon nitride(C3 N4) was developed by popping of mixture containing C3 N4 and cupric nitrate. Characterizations such as X-ray photoelectron spectroscopy(XPS) and X-ray diffraction(XRD) indicate that the structure of g-C3 N4 maintained although a popping process occurred. High resolution transmission electronic microscopy(HRTEM) characterization illustrated that copper-based nanoparticles with diameter of < 1 nm were well distributed on g-C3 N4. This kind of copper catalyst exhibits high catalytic activity and selectivity in arylation of pyrazole, a simple and effect strategy to construct C-N bond in organic chemistry.According to the results of control experiments and characterizations, cuprous oxide should be the catalytic active phase in the supported coperbased catalyst.
