检索结果-南通市图书馆

TcPO2 changes are more pronounced than SpO2 changes during simulated altitude changes in a hypobaric oxygen chamber: a nonrandomized controlled trial

在线全文

学校读者我要写书评

暂无评论

Emergency and Critical Care Medicine 2024年第3期4卷 105-110页

作者： li Y. Chen l. Fu Z. Wang Z. Sun S. luan X. ma D. Hu T. School of Nursing and Rehabilitation Shandong University Shandong Jinan China Department of Emergency and Critical Care Medicine Qilu Hospital of Shandong University Shandong Jinan China Department of Pulmonary and Critical Care Medicine Qilu Hospital of Shandong University Shandong Jinan China Emergency management Center of State Grid Shandong Electric Power Company Shandong Jinan China School of Nursing and Rehabilitation Cheeloo College of Medicine University of Shandong Department of Infection Control Qilu Hospital of Shandong University Shandong Jinan China School of Mechanical Engineering Shandong University Key Laboratory of the Ministry of Education for Efficient and Clean Machinery Manufacturing National Experimental Teaching Demonstration Center for Mechanical Engineering Shandong Jinan China

Background: Hypoxia is a significant risk factor of hypertension. However, no studies have used transcutaneous tissue partial pressure of oxygen (TcPO2) and partial pressure of carbon dioxide (TcPCO2) monitors to measure the respective partial pressures in healthy individuals. Oxygen saturation (SpO2) is often used for traditional monitoring of vital signs. This study investigated the changes in TcPO2 and SpO2 values during rapid changes in altitude. The trial was registered at *** (registration no. NCT06076057). Methods: Healthy adult volunteers were instructed to sit vertically in a hypobaric oxygen chamber, which ascended from 0 m to 2500 m at a uniform speed within 10 min. The Danish Radiometer TCM4 was used to measure TcPO2 and TcPCO2 with the ventral side of the upper arm as the measurement site. The Shenzhen kerokan P0D-1 W pulse oximeter was used to measure heart rate and SpO2, with values recorded once every 500 m. Results: Altogether, 49 healthy volunteers were recruited between march 2023 and August 2023. With increasing altitude, TcPO2 and SpO2 decreased significantly (P lly at 500 m (P lly at 1000 m (P ltitude, the difference in TcPO2 was greater than the difference in SpO2. At 1000 m, there were statistically significant changes in TcPO2 and SpO2 (P ltitudes >500 m, statistical significance was identified between TcPO2 in both sexes (P l significance in TcPCO2 and heart rate was observed at the different elevations (P lusion: In acutely changing low-pressure hypoxic environments, TcPO2 changed more dramatically than SpO2 © Wolters kluwer Health, Inc. All rights reserved.

关键词： Altitude change low-pressure oxygen chamber Transcutaneous oxygen saturation Transcutaneous partial pressure of oxygen

Carbon dot-based artificial light-harvesting systems with sequential energy transfer and white light emission for photocatalysis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical letters 2024年第4期35卷 409-413页

作者： Chaoqun ma Yuebo Wang Ning Han Rongzhen Zhang Hui liu Xiaofeng Sun lingbao Xing School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255000China Department of materials Engineering KU LeuvenLeuven 3001Belgium

In this work, we designed and synthesized cationic carbon dots(CDs) with a size distribution of 1.6–3.7 nm, which exhibited dark blue fluorescence in the aqueous solution. Based on its excellent luminescence properties, we used it as an energy donor to construct a sequential artificial light-harvesting system(lHS) by employing the energy-matching dyes eosin Y disodium salt(EY) and sulforhodamine101(SR101), which could regulate the white light emission(Commission Internationale de l'Eclairage(CIE) coordinate:(0.30, 0.31)) with the energy transfer efficiency(ΦET) of 53.9% and 20.0%. Moreover, a single-step artificial lHS with white light emission(0.32, 0.28) can be constructed directly using CDs and dye solvent 43(SR) with ΦETand antenna effect(AE) of 48.8% and 6.5, respectively. More importantly,CDs-based artificial lHSs were firstly used in photocatalytic of α-bromoacetophenone, with a yield of90%. This work not only provides a new strategy for constructing CDs-based lHSs, but also opens up a new application for further applying the energy harvested in CDs-based lHSs to the field of the aqueous solution photocatalysis.

关键词： Carbon dots White light emission Energy transfer Antenna effect Artificial light-harvesting system Photocatalysis

A general synthetic strategy for N, P co-doped graphene supported metal-rich noble metal phosphides for hydrogen generation

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2024年第1期9卷 152-162页

作者： Jingwen ma Xiang li Guangyu lei Jun Wang Juan Wang Jian liu Ming ke Yang li Chunwen Sun School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing100083China State key laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China lab of Advanced Nano-structures&Transfer Processes Department of Chemical EngineeringTianjin UniversityTianjin300354China PetroChina Planning and Engineering Institute Beijing100083China

The exploitation of electrocatalysts with high activity and durability for HER is desirable for future energy systems,but it is still a *** have attracted increasing attentions,but the preparation process often needs toxic regents or dangerous reaction ***,we develop a general green method to fabricate metal-rich NMPs anchored on NPG through pyrolyzing DNA cross-linked *** obtained Ru_(2) P-NPG exhibits an ultrasmall overpotential of 7 mV at 10 ma cm^(2) and ultralow Tafel slope of 33 mV dec^(-1) in 1.0 mol l?1 kOH,even better than that of commercial Pt/*** addition,Ru 2 P-NPG also shows low overpotentials of 29 and 78 mV in 0.5 mol l^(-1) H_(2)SO_(4) and 1.0 mol l^(-1) PBS,*** superior activity can be attributed to the ultrafine dispersion of Ru 2 P nanoparticles for more accessible sites,more defects formed for abundant active sites,the two-dimensional plane structure for accelerated electron transfer and mass transport,as well as the regulation of electron distribution of the ***,the synthetic method can also be applied to prepare other metal-rich noble metal phosphides(Pd_(3)P-NPG and Rh_(2)P-NPG),which also exhibits high activity for *** work provides an effective strategy for designing NMP-based electrocatalysts.

关键词： Noble metal phosphides Electrocatalyst Deoxyribonucleic acid Hydrogen evolution pH universal

manipulating the macroscopic and Microscopic Morphology of large-Area Gravure-Printed ZnO Films for High-Performance Flexible Organic Solar Cells

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental materials 2024年第2期7卷 229-239页

作者： Zhenguo Wang Jingbo Guo Yaqin Pan Jin Fang Chao Gong lixin Mo Qun luo Jian lin Changqi ma School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China i-lab&Printable Electronics Research Center Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences(CAS)Suzhou 215123China Beijing Engineering Research Center of Printed Electronics Beijing Institute of Graphic CommunicationBeijing 102600China Jiangxi Institute of Nanotechnology Chinese Academy of Sciences(CAS)Nanchang 330200China

Gravure printing is a promising large-scale fabrication method for flexible organic solar cells(FOSCs)because it is compatible with two-dimension patternable roll-to-roll ***,the unsuitable rheological property of ZnO nanoinks resulted in unevenness and looseness of the gravure-printed ZnO interfacial *** we propose a strategy to manipulate the macroscopic and microscopic of the gravure-printed ZnO films through using mixed solvent and poly(vinylpyrrolidone)(PVP)*** regulation of drying speed effectively manipulates the droplets fusion and leveling process and eliminates the printing ribbing structure in the macroscopic *** additive of PVP effectively regulates the rheological property and improves the microscopic compactness of the *** this method,large-area ZnO∶PVP films(28×9 cm^(2))with excellent uniformity,compactness,conductivity,and bending durability were *** power conversion efficiencies of FOSCs with gravure-printed AgNWs and ZnO∶PVP films reached 14.34%and 17.07%for the 1 cm^(2)PM6:Y6 and PM6∶l8-BO flexible *** efficiency of 17.07%is the highest value to date for the 1 cm^(2)*** use of mixed solvent and PVP addition also significantly enlarged the printing window of ZnO ink,ensuring high-quality printed thin films with thicknesses varying from 30 to 100 nm.

关键词： flexible organic solar cell gravure printing large-area flexible interfacial layer rheology properties zinc oxide

Improvement of impact properties of Al-Si-Mg alloy via solution treatment and joint modification with Sr and la

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第7期43卷 3301-3313页

作者： Xiong-ling Zheng Shao-Xiang li Jia-le ma Qing-Yan Xu Hai-Dong Zhao Zhi-Qiang Han key laboratory for Advanced materials Processing Technology Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China National Engineering Research Center of Near-Net Shape Forming for Metallic materials South China University of TechnologyGuangzhou 510641China

An effort to obtain superior impact properties for Al-7Si-0.35 Mg alloy is presented,where modification with 0.02 wt% Sr and 0.1 wt% la as well as solution treatment was jointly *** samples were solution treated at 535℃ for 15 min to 12 *** microstructure,fracture mechanism,and their correlation with the impact properties of the alloy were studied in detail mainly through optical microscopy(OM),scanning electron microscopy(SEM) and oscillography impact *** results show that the addition of Sr and la refined the eutectic Si particles significantly from~ 2.05 μm(modified with Sr alone) to~ 0.75 μm in as-cast microstructure,leading to a very homogeneous distribution of spheroidized Si particles in the alloy solution treated at 535℃ for 8 *** alloy exhibits excellent impact toughness up to 75 J·cm^(-2),which is much higher than the maximum impact toughness of the alloys modified by Sr alone(~ 46 J·cm^(-2)).The major reason for this remarkable increase in the impact property is the dramatic increase in crack initiation *** dispersoid-free zones(DFZs)near the eutectic regions mainly consist of the ductile Al-matrix,which exhibits excellent *** ductile Al-matrix of the DFZs hinders the crack propagation,resulting in a significant increase in crack propagation energy.

关键词： Aluminum alloys Modification Solution treatment Microstructure Impact properties Fracture mechanism

Simultaneous determination of five plant hormones in cotton leaves using QuEChERS combined with HPlC‒MS/MS

在线全文

学校读者我要写书评

暂无评论

Journal of Cotton Research 2024年第2期7卷 163-176页

作者： WANG Wenhao SONG Xianpeng WANG Dan ma Yajie SHAN Yongpan REN Xiangliang HU Hongyan WU Changcai YANG Jun ma Yan National key laboratory of Cotton Biobreeding and Integrated Utilization Institute of Cotton ResearchChinese Academy of Agricultural SciencesAnyangHenan 455000China College of Agriculture Hebei Agricultural UniversityBaodingHebei 071000China Zhengzhou Research Base National Key Laboratory of Cotton Biobreeding and Integrated UtilizationZhengzhou UniversityZhengzhouHenan 450001China Western Agricultural Research Center Chinese Academy of Agricultural SciencesChangjiXinjiang 831100China

Background Plant hormones profoundly influence cotton growth,development,and responses to various ***,there is a pressing need for an efficient assay to quantify these hormones in *** this groundbreaking study,we have established QuEChERS-HPlC‒MS/MS method,for the simultaneous detection of multiple plant hormones in cotton leaves,allowing the analysis and quantification of five key plant *** Sample extraction and purification employed 0.1%acetic acid in methanol and C18 for optimal recovery of plant *** method applied to cotton demonstrated excellent linearity across a concentration range of 0.05–1 mg・l−1,with linear regression coefficients exceeding *** limits of quantification(lOQs)were 20μg・kg−1 for GA3 and 5μg・kg−1 for the other four plant *** rates for the five plant hormones matrix spiked at levels of 5,10,100,and 1000μg・kg−1 were in the range of 79.07%to 98.97%,with intraday relative standard deviations(RSDs)ranging from 2.11%to 8.47%.The method was successfully employed to analyze and quantify the five analytes in cotton leaves treated with plant growth *** The study demonstrates that the method is well-suited for the determination of five plant hormones in *** exhibits excellent selectivity and sensitivity in detecting field samples,thus serving as a robust tool for indepth research into cotton physiology.

关键词： Cotton Plant hormones QuEChERS HPlC‒MS/MS

A homopolymolybdate-supported plate-like 2D cobalt network constructed from a new pyrazole-amide-pyridyl ligand: highly electrochemical activity in both capacitive performance and the detection of Cr(Ⅵ)

在线全文

学校读者我要写书评

暂无评论

Tungsten 2024年第2期6卷 422-427页

作者： Xiu-li Wang Yong-Zhen Chen Zhi-Han Chang Yu-Chun lin Jing-Yi ma College of Chemistry and materials Engineering Bohai UniversityJinzhou 121013China Professional Technology Innovation Center of liaoning Province for Conversion materials of Solar Cell Jinzhou 121013China

By employing a new semi-rigid pyrazole-amide-derived bis(pyridyl)ligand[N,N'-bis(4-picolylamine)-1-hydropyrazole(4-dpap)],a new homopolymolybdate-based two-dimensional(2D)plate-like complex[Co(4-dpap)(H_(2)O)(β-Mo_(8)O_(2)6)1/2](1)has been prepared under solvothermal condition and structurally ***β-Mo_(8)anions are fi xed between the 2D metal–organic networks[Co(4-dpap)(H_(2)O)]n 2n+via hydrogen-bonding *** 1 possesses satisfactory specifi c capacitance of 1512.4 F·g^(−1)(current density:1 A·g^(−1))and good cycling stability(90.8%after 1000 cycles).Moreover,1 represents a promising amperometric sensor for measurement of Cr(Ⅵ)with low detection limit(0.042μmol·l^(−1))and high *** insertion ofβ-Mo_(8)anions between the unique 2D metal−organic networks improves the active area of polyoxometalates,which further promotes electrochemical performance.

关键词： Homopolymolybdate Metal–organic network Pyrazole-amide-derived bis(pyridyl)ligand Supercapacitor Electrochemical sensor

在线全文

学校读者我要写书评

暂无评论

CFB锅炉宽筛分颗粒临界流化风速研究

中南大学学报（自然科学版） 2024年第7期55卷 2813-2818页

作者：于艺马有福吕俊复上海理工大学上海市动力工程多相流动与传热重点实验室上海200093 怀柔实验室山西研究院山西太原030032 清华大学教育部热科学与动力工程重点实验室北京100084

基于计算颗粒流体力学(CPFD),通过表征常规CFB锅炉床料(Set 1)、增加炉内细颗粒含量(Set 2)和减小初始床支撑料粒度(Set 3) 3种筛分分布的SiO_(2)颗粒,研究颗粒筛分变化对临界流化风速的影响。研究结果表明:在相同床层高度下,Set 1、Se... 详细信息

基于计算颗粒流体力学(CPFD),通过表征常规CFB锅炉床料(Set 1)、增加炉内细颗粒含量(Set 2)和减小初始床支撑料粒度(Set 3) 3种筛分分布的SiO_(2)颗粒,研究颗粒筛分变化对临界流化风速的影响。研究结果表明:在相同床层高度下,Set 1、Set 2和Set 3床料的临界流化风速分别为0.51、0.30和0.20 m/s。表明增加炉内细颗粒含量和减小初始床支撑料粒度均可明显降低临界流化风速。将宽筛分颗粒临界流化风速的数值模拟结果与相关关联式预测结果进行对比,表明ERGUN关联式的预测结果偏差较小,WEN-YU关联式的预测结果明显偏低。

关键词：循环流化床锅炉临界流化风速宽筛分颗粒计算颗粒流体力学

Novel phenanthrene/bibenzyl trimers from the tubers of Bletilla striata attenuate neuroinﬂammation via inhibition of NF-κB signaling pathway

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2024年第5期22卷 441-454页

作者： SHAO Siyuan SUN Mohan ma Xianjie JIANG Jianwei TIAN Jinying ZHANG Jianjun YE Fei lI Shuai State key laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100050China

Five novel(9,10-dihydro)phenanthrene and bibenzyl trimers,as well as two previously identified biphenanthrenes and bibenzyls,were isolated from the tubers of Bletilla *** structures were elucidated through comprehensive analyses of NMR and HRESIMS spectroscopic *** absolute configurations of these compounds were determined by calculating rotational energy barriers and comparison of experimental and calculated ECD *** 5b and 6 exhibited inhibitory effects on lPS-induced NO production in BV-2 cells,with IC_(50) values of 12.59±0.40 and 15.59±0.83μmol·l^(-1),respectively.A mechanistic study suggested that these compounds may attenuate neuroinflammation by reducing the activation of the AkT/IκB/NF-κB signaling ***,compounds 3a,6,and 7 demonstrated significant PTP1B inhibitory activities,with IC_(50) values of 1.52±0.34,1.39±0.11,and 1.78±0.01μmol·l^(-1),*** investigation revealed that compound 3a might inhibit lPS-induced PTP1B overexpression and NF-κB activation,thereby mitigating the neuroinflammatory response in BV-2 cells.

关键词： Bletilla striata Phenanthrene/bibenzyl trimer NO inhibition AkT/IκB/NF-κB signaling pathway PTP1B inhibitory effect