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沙库巴曲缬沙坦对初始血液透析患者残余肾功能及左心室质量指数的影响

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系统医学 2024年第11期9卷 5-8,16页

作者：杨禄颜文朝晖黄亚羡李俊杜茂名市中医院肾内科广东茂名525000

目的探讨沙库巴曲缬沙坦对初始血液透析患者残余肾功能及左心室质量指数的影响。方法选取2022年5月—2023年11月在茂名市中医院进行初始血液透析的60例患者为研究对象,按照患者是否使用沙库巴曲缬沙坦分为对照组及观察组,各30例。对... 详细信息

目的探讨沙库巴曲缬沙坦对初始血液透析患者残余肾功能及左心室质量指数的影响。方法选取2022年5月—2023年11月在茂名市中医院进行初始血液透析的60例患者为研究对象,按照患者是否使用沙库巴曲缬沙坦分为对照组及观察组,各30例。对照组接受基础治疗,观察组则在基础治疗的基础上加用沙库巴曲缬沙坦。对比两组治疗效果。结果治疗后,观察组白蛋白、血红蛋白、前白蛋白水平高于对照组,生化指标、肾功能指标水平低于对照组,心功能指标优于对照组,差异有统计学意义(P均0.05)。结论沙库巴曲缬沙坦可有效改善初始血液透析患者的实验室指标,提高患者残余肾功能及左心室质量指数。

关键词：沙库巴曲缬沙坦初始血液透析残余肾功能左心室质量指数

Phytic acid-derivative Co_(2)B-CoPO_x coralloidal structure with delicate boron vacancy for enhanced hydrogen generation from sodium borohydride

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Chinese Chemical Letters 2024年第4期35卷 525-531页

作者： luyan Shi Ke Zhu Yuting yang Qinrui Liang Qimin Peng Shuqing Zhou Tayirjan Taylor Isimjan Xiulin yang Guangxi Key Laboratory of Low Carbon Energy Materials School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004China Saudi Arabia Basic Industries Corporation(SABIC)at King Abdullah University of Science and Technology(KAUST) Thuwal 23955-6900Saudi Arabia

Application of transition metal boride(TMB) catalysts towards hydrolysis of NaBH_(4) holds great significance to help relieve the energy crisis. Herein, we present a facile and versatile metal-organic framework(MOF) assisted strategy to prepare Co_(2)B-CoPO_x with massive boron vacancies by introducing phytic acid(PA) cross-linked Co complexes that are acquired from reaction of PA and ZIF-67 into cobalt boride. The PA etching effectively breaks down the structure of ZIF-67 to create more vacancies, favoring the maximal exposure of active sites and elevation of catalytic activity. Experimental results demonstrate a drastic electronic interaction between Co and the dopant phosphorous(P), thereby the robustly electronegative P induces electron redistribution around the metal species, which facilitates the dissociation of B-H bond and the adsorption of H_(2)O molecules. The vacancy-rich Co_(2)B-CoPO_x catalyst exhibits scalable performance, characterized by a high hydrogen generation rate(HGR) of 7716.7 m L min^(-1)g^(-1) and a low activation energy(Ea) of 44.9 k J/mol, rivaling state-of-the-art catalysts. This work provides valuable insights for the development of advanced catalysts through P doping and boron vacancy engineering and the design of efficient and sustainable energy conversion systems.

关键词： Co_(2)B-CoPO_x catalyst P doping Boron vacancy NaBH_(4) hydrolysis Hydrogen generation

Effect of abruptly changing withdrawal rate on solidification microstructure in directionally solidified Al-4.5wt%Cu alloy

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China Foundry 2014年第1期11卷 8-13页

作者： yang luyan Li Shuangming Zhong Hong Ren Ruohua Fu Hengzhi State Key Laboratory of Solidif ication Processing Northwestern Polytechnical University

Al-4.5wt.%Cu alloy has been directionally solidified at constant and abruptly changing withdrawal rates, respectively. The effects of the withdrawal rate on solidification microstructure, primary dendrite arm spacing(PDAS) and liquid solute distribution in front of the solid-liquid interface were investigated. The experimental results for the PDAS at a constant withdrawal rate agree well with the values calculated by the Hunt, Trivedi and Hunt-Lu models. At an abrupt change in the withdrawal rate, the maximum to minimum ratio of the PDAS at a given solidification parameter, i.e. λ1max/λ1min, is more than 2, and the PDAS values are remarkably history-dependent. Further, the liquid-solute distribution curve based on theoretical calculation shows that the larger the initial withdrawal rate is, the smaller the minimum of liquid solute concentration in front of the solid-liquid interface is after the abrupt change in withdrawal rate.

关键词： directional solidification abrupt change of withdrawal rate primary dendrite arm spacing liquid-solute distribution Al-4.5wt.%Cu alloy

Twin crystal structured Al-10 wt.% Mg alloy over broad velocity conditions achieved by high thermal gradient directional solidification

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Journal of Materials Science & Technology 2021年第12期71卷 152-162页

作者： luyan yang Shuangming Li Kai Fan yang Li Yanhui Chen Wei Li Deli Kong Pengfei Cao Haibo Long Ang Li Institute of Microstructure and Properties of Advanced Materials Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing100124China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons Forschungszentrum Jülich52428JülichGermany

Twin crystal structured Al-10 wt.% Mg alloys that were grown over a broad solidification velocity range were prepared and studied for the first *** high thermal gradient(G)and growth velocity(V)of directional solidification resulted in the dominant solidification of twins:the twinned dendrite trunks at constant high Vs curved in the G direction with large angles in 7 mm diameter crucibles and invaded regular columnar grains because of a distinct kinetics growth *** deceleration experiments were designed to produce twin crystals that evolved with lower values of V(100,10,and 0.5μm/s)and had a structural coarsening *** cell growth in the absence of arms occurred at a growth velocity of 10μm/s.A coherency loss was observed at a growth velocity of 0.5μm/s with straight coherent twin boundaries turning into curved incoherent *** theoretical analyses were performed to understand the structural evolution of the *** results demonstrate the possibility of producing dense and controlled twin crystals in the Al-Mg system under most industrial production conditions;thus,this approach can be a new structural choice for designing Al-Mg-based alloys that have widespread commercial applications.

关键词： Directional solidification Aluminum alloy Microstructural evolution Feathery crystals Twinned dendrites

Effect of the withdrawal rate on the microstructure and thermal durability of a third-generation single crystal superalloy

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Progress in Natural Science:Materials International 2021年第3期31卷 493-500页

作者： Yunsong Zhao Mai Zhang luyan yang Yuanyuan Guo Jian Zhang Hui Lu Yanhui Chen Dingzhong Tang Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials Institute of Microstructure and Property of Advanced Materials Beijing University of Technology

Single crystal Ni-based superalloys are the typical structural materials for high-pressure turbine blades,and their microstructure is critical in determining their mechanical *** withdrawal rate is a key parameter affecting the microstructure during the single crystal growth *** the present work the effect of the withdrawal rate on the microstructure of a third-generation single crystal superalloy containing 6.8 wt% Re has been investigated,and the creep resistance of the alloy *** results showed that increased withdrawal rate refined the dendritic structure,reduced dendritic arm spacing,promoted the growth of secondary tertiary dendrites and decreased solidification segregation with a reduced size of γ’ *** porosity density of the ascast alloy first decreased and then increased with the withdrawal rate,while the minimum porosity densityoccurred when the alloy was under the solidification condition of withdrawal rate of 4.5 mm/*** maximum creep rupture life of 326.4 h of the heat-treated alloys under the test condition of 1100℃/140 MPa also appeared at the alloys under the withdrawal rates of 4.5 mm/*** is believed that the minimum porosity density and reduced size of the γ’ phase may be the main reasons for the enhanced creep rupture life of the alloys with withdrawal rates of 4.5 mm/*** investigation provides theoretical support and a practical basis for the development of third-generation single crystal superalloys.

关键词： Nickel-based superalloy Withdrawal rate Microstructure Thermal durability

Stimulated Brillouin interaction between guided phonons and photons in a lithium niobate waveguide

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 173-175页

作者： Yuan-Hao yang Jia-Qi Wang Zheng-Xu Zhu Xin-Biao Xu Qiang Zhang Juanjuan Lu Yu Zeng Chun-Hua Dong luyan Sun Guang-Can Guo Chang-Ling Zou CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China Center for Quantum Information Institute for Interdisciplinary Information SciencesTsinghua UniversityBeijing 100084China

The Brillouin scattering is one of the strongest nonlinear optical effects in dielectrics[1].In particular,the backward Brillouin scattering(BBS)provides an efficient method to achieve low-noise optical gain for active photonics[2]and the coherent interconnects between 10 GHz phonons and photons[3].However,previous studies on BBS are primarily limited to the unconfined phonons[1]or phonon confined in suspended structures[4-6].

关键词： scattering waveguide Brillouin

微生态制剂治疗维持性血液透析合并顽固性高血压患者的效果观察

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临床医学工程 2023年第5期30卷 619-620页

作者：杨禄颜曾明源茂名市中医院肾内科广东茂名525000

目的探讨微生态制剂治疗维持性血液透析患者合并顽固性高血压的临床效果。方法选择我院2021年9月至2022年9月收治的60例维持性血液透析合并顽固性高血压患者分为两组。对照组给予优质蛋白质饮食,观察组在对照组基础上采用微生态制剂... 详细信息

目的探讨微生态制剂治疗维持性血液透析患者合并顽固性高血压的临床效果。方法选择我院2021年9月至2022年9月收治的60例维持性血液透析合并顽固性高血压患者分为两组。对照组给予优质蛋白质饮食,观察组在对照组基础上采用微生态制剂双歧杆菌三联活菌胶囊治疗,两组均治疗4周。比较两组患者的血压[收缩压(SBP)、舒张压(DBP)、平均动脉压(MAP)]、微炎症状态[肿瘤坏死因子-α (TNF-α)、超敏C反应蛋白(hs-CRP)、干扰素-γ (IFN-γ)]及不良反应发生情况。结果治疗后,观察组SBP、 DBP、 MAP、 TNF-α、 hs-CRP、 IFN-γ水平低于对照组(P 0.05)。结论微生态制剂治疗维持性血液透析合并顽固性高血压患者可有效降低其血压水平,改善微炎症状态,临床应用安全性较高。

关键词：微生态制剂维持性血液透析顽固性高血压临床疗效安全性

靶向引经报使药对维持性血液透析患者骨代谢的影响

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智慧健康 2023年第19期9卷 154-157页

作者：魏涛曾明源杨禄颜茂名市中医院肾病科广东茂名525000

目的探讨靶向引经报使药对维持性血液透析患者骨代谢的影响。方法选择2021年2月-2023年2月肾病科门诊就诊及住院治疗的维持性血液透析患者180例为研究对象,根据经络辨证随机分为6组,即对照组2组,治疗组4组。对照组:肾经、肝经组均在一... 详细信息

目的探讨靶向引经报使药对维持性血液透析患者骨代谢的影响。方法选择2021年2月-2023年2月肾病科门诊就诊及住院治疗的维持性血液透析患者180例为研究对象,根据经络辨证随机分为6组,即对照组2组,治疗组4组。对照组:肾经、肝经组均在一般基础治疗上,口服骨化三醇,治疗组在一般基础治疗及口服骨化三醇基础上大剂量药引子肾经、肝经分别口服川芎牛膝20g、配伍自拟补肾壮骨方;小剂量药引子肾经、肝经组分别口服川牛膝10g,配伍自拟补肾壮骨方,各组均完成3个月治疗,比较各组骨代谢水平及安全性。结果6组干预3个月后骨代谢水平得到提升;观察肾经大剂量组、观察肝经大剂量组、观察肾经小剂量组和观察肝经小剂量组PTH、P及ALP水平低于对照肾经组和对照肝经组(P0.05)。结论靶向引经报使药用于维持性血液透析患者中,改善患者骨代谢水平,且治疗安全性较高,值得推广应用。

关键词：靶向引经报使药维持性血液透析骨代谢安全性

构筑富含磷空位缺陷的磷化钯催化剂实现高效和抗CO毒化的碱性氢氧化反应

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Chinese Journal of Catalysis 2024年第1期56卷 176-187页

作者：杨玉婷石路岩梁沁睿刘奕董家新 Tayirjan Taylor Isimjan 王宝杨秀林广西师范大学化学与药学学院广西低碳能源材料重点实验室中国广西桂林541004 中山大学环境科学与工程学院中国广东广州510275 中国科学院过程工程研究所生化工程国家重点实验室中国北京100190 阿卜杜拉国王科技大学的沙特阿拉伯基础工业公司图瓦勒沙特阿拉伯

碱性阴离子交换膜燃料电池(AEMFCs)可以直接将氢的化学能转化为电能,被认为是新兴绿色氢经济的基石技术.但其阳极氢氧化反应(HOR)动力学缓慢,严重依赖于Pt基催化剂.由于Pt基催化剂极易被CO毒化、动力学过程复杂以及价格昂贵,极大限制了... 详细信息

碱性阴离子交换膜燃料电池(AEMFCs)可以直接将氢的化学能转化为电能,被认为是新兴绿色氢经济的基石技术.但其阳极氢氧化反应(HOR)动力学缓慢,严重依赖于Pt基催化剂.由于Pt基催化剂极易被CO毒化、动力学过程复杂以及价格昂贵,极大限制了其商业化应用.因此,亟需开发高效、稳定和抗CO毒化能力强的新型HOR催化剂.Pd具有与Pt相似的氢键结合能,并且比Pt储量丰富,有望成为实现HOR的候选催化剂.然而,Pd的本征催化活性和Pt相比仍有很大差距.近年来,磷化钯因具有功能多样性和高催化活性被广泛关注.此外,缺陷工程可以有效调控催化剂的表面结构,改善中间体的吸附强度,提高催化剂的催化活性.因此,构建富含缺陷的磷化钯催化剂有望提高其HOR的性能.然而,该方向研究较少,反应机理尚不清楚.因此,阐明空位缺陷对于提高磷化钯催化剂HOR性能的作用机制,对促进AEMFCs电催化反应具有重要意义.本文通过溶胶-凝胶法以及低温磷化策略合成了一种碗状半球结构的富含磷空位Pd3P@C(V_(p)-Pd_(3)P@C)催化剂,并用于碱性HOR.在磷化过程中,通过调整Pd前驱体和磷源比例以及煅烧温度,在碳碗状半球载体上合成具有不同晶相组成(Pd/Pd_(3)P@C,Pd_(3.20)P_(12)@C,Pd_(3)P@C,和Pd_(5)P_(2)@C)的Pd_(x)P_(y)@C催化剂.扫描电镜和透射电镜证实了催化剂为碗状半球形貌.利用电子顺磁共振波谱研究了Pd_(x)P_(y)@C催化剂的磷空位浓度,结果表明,Pd/P比例为1:3时,在350℃下煅烧得到的Vp-Pd_(3)P@C具有最高的磷空位浓度.X射线光电子能谱证实了磷空位促进了d-p轨道杂化,增强了Pd和磷之间的电子相互作用.电化学测试结果表明,Vp-Pd_(3)P@C具有最高的HOR性能,Vp-Pd_(3)P@C在50 mV的质量活性为1.66 mAμg_(Pd)^(–1),交换电流密度为3.2 mA cm^(–2),优于Pd3P(0.45 mAμg_(Pd)^(-1),1.78 mA cm^(–2))和商业Pt/C(0.3 mAμg_(Pd)^(-1),2.29 mA cm^(–2)).同时,该催化剂在50 mV的电位下能稳定运行20 h.此外,即使在CO浓度高达1000 ppm时,Vp-Pd_(3)P@C催化剂仍表现出较好的HOR活性.紫外光电子能谱证实了Vp-Pd_(3)P@C中的Pd原子呈现缺电子状态,这不利于Pd 4d轨道对CO 2π^(*)轨道的电子反馈,降低了Pd和CO的键合强度,进而减弱了Pd对CO分子的吸附,从而增强了其抗CO中毒的能力.密度泛函理论计算结果表明,相较于磷空位浓度较少的Pd_(3)P@C催化剂,富含磷空位缺陷的Vp-Pd_(3)P@C催化剂能够优化和平衡反应中间体(Hads和OHads)的吸附强度,使速率决定步骤从H_(2)O^(*)的解吸转换到H_(2)O的形成,促进了Volmer反应(Hads+OHads→H_(2)O+2^(*)sites)的进行,进而提升了催化活性.系统实验和表征结果表明,Vp-Pd_(3)P@C较好的HOR性能可归因于以下3个因素:(1)空心碗状结构大大地增加了固-液-气三相接触点,加速了HOR的传质过程;(2)磷空位产生的局部反应活性和有利的电子结构优化了Hads和OHads的吸附强度,极大地促进了Volmer步骤;(3)丰富的磷空位打破了原有的周期性晶体结构,形成了新的电子结构,有效地抑制了电子从Pd 4d轨道到CO 2π^(*)轨道的反馈,提高了Vp-Pd_(3)P@C对CO的耐受能力.综上,本文通过缺陷工程策略调控了Vp-Pd_(3)P@C中活性位点与HOR关键中间体的相互作用,明确了空位缺陷浓度与HOR活性之间的构效关系.并从碱性HOR反应机理,CO分子与金属催化剂的轨道相互作用以及结构设计三个方面总结了高效和稳定的HOR催化剂的设计原则.目前,由于界面环境的复杂性和缺乏原位技术,催化剂表面上痕量中间体的光谱信息难以获得,未来可在开发原位技术监测HOR过程中间体和催化剂的组分变化方面做出更多的努力,以促进AEMFCs的商业化应用.

关键词：氢氧化反应 CO耐受性磷空位 V_(p)-Pd_(3)P@C 碗状半球