检索结果-南通市图书馆

Journal of Wuhan University of Technology(Materials Science) 2024年第6期39卷 1391-1396页

作者： ZHU Hai yuan mengzhen ZHENG Liangjian FAN Jia PENG Xinhao ZHANG Jun Department of Oncology The Third People’s Hospital of ChengduThe Affiliated Hospital of Southwest Jiaotong UniversityChengdu 610031China Medical Research Center The Third People’s Hospital of ChengduThe Affiliated Hospital of Southwest Jiaotong UniversityChengdu 610031China

A series of tungstate red phosphors K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)were successfully prepared by sol-gel method,and the effects of the introduction of Li^(+)and SO_(4)^(2-)on the fluorescence intensity and thermal quenching properties of the prepared K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)phosphors were *** X-ray diffraction data show that the prepared(Li^(+)and SO_(4)^(2-))-doped KEu(WO_(4))_(2)phosphors have a monoclinic tetragonal *** addition,the emission intensities of all the observed emission peaks change significantly with the increase of Li~+doping concentration,especially the intensity of the emission peaks at 615 nm fluctuated significantly and reached the maximum at x=0.3 and y=*** K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)phosphors are found to have the highest fluorescence intensity at x=0.3 and y=***,the K_(0.7)Li_(0.3)Eu(WO_(4))_(1.8)(SO_(4))_(0.2)phosphor has better thermal quenching properties and luminescence efficiency,and the experimental results indicates that the fluorescence intensity and thermal burst performance of KEu(WO_(4))_(2)red phosphor could be effectively improved by using low-cost bionic doping of Li^(+)and SO_(4)^(2-).

关键词： sol-gel fluorescence phosphors KEu(WO_4)_(2) Li^(+) SO_(4)^(2-)

Sn-decorated CeO_(2) with different morphologies for direct dehydrogenation of ethylbenzene

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第1期42卷 102-109,I0004页

作者： Kai Zhang Guoju Cui mengzhen yuan Huiwen Huang Ning Li Jiale Xu Guowei Wang Chunyi Li State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao266580China Petrochemical Plant of Sinopec Shengli Oilfield Company Dongying257237China College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao266590China

Three Sn-decorated ceria catalysts with various morphologies(rods,particles,and cubes)were prepared and applied to the direct dehydrogenation of ***-technology characterizations,including X-ray photoelectro n spectroscopy(XPS),H_(2)-tempe rature programmed reduction(H_(2)-TPR),and Raman spectroscopy,prove that the oxygen vacancies are the active sites for ethylbenzene dehydrogenation,which can be regulated by engineering CeO_(2) morphology and enhanced via introducing metal *** the results of activity test,the catalytic activities for ethylbenzene dehydrogenation over different samples are closely dependent on the amount of oxygen *** reduced Sn-decorated CeO_(2) catalyst with nanoparticles morphology exhibits better dehydrogenation performance than the other two studied catalysts at 600℃.This work provides an effective approach to regulate the active oxygen vacancies and further enhance the dehydrogenation activities through engineering the surface morphology of the catalyst and introducing suitable additives.

关键词： Ethylbenzene dehydrogenation CeO_(2) Sn Morphology Oxygen vacancy Rare earths

2010—2013年中国近代教科书研究综述

在线全文

学校读者我要写书评

暂无评论

黑河学院学报 2014年第1期5卷 113-116页

作者：苑梦珍河北大学历史学院河北保定071000

教科书作为教育体系的重要组成部分,对其研究越来越受到学界的重视。近几年来,中国近代教科书研究又取得丰硕成果,这对中国近代教育的研究具有重大意义。近三年来,对中国近代教科书的研究,在教科书内容、分类、发展、编审制度、人物等... 详细信息

教科书作为教育体系的重要组成部分,对其研究越来越受到学界的重视。近几年来,中国近代教科书研究又取得丰硕成果,这对中国近代教育的研究具有重大意义。近三年来,对中国近代教科书的研究,在教科书内容、分类、发展、编审制度、人物等方面取得较大进展,但缺少对应用者、读者的反映及影响研究。

关键词：近代教科书综述

叔丁基过氧化氢催化分解制备丙酮及催化剂失活原因

在线全文

学校读者我要写书评

暂无评论

精细化工 2024年第8期41卷 1795-1803页

作者：李宁袁孟真徐家乐李修仪王国玮祝晓琳李春义中国石油大学国家重质油重点实验室山东青岛266580

以催化异丁烷和氧气为原料生成的叔丁基过氧化氢(TBHP)分解来制备丙酮。对制备丙酮的最优反应条件、催化体系、催化剂稳定性、循环利用性以及催化剂失活的原因进行了考察。结果表明,催化剂的酸性对反应的活性有明显的影响,β分子筛具有... 详细信息

以催化异丁烷和氧气为原料生成的叔丁基过氧化氢(TBHP)分解来制备丙酮。对制备丙酮的最优反应条件、催化体系、催化剂稳定性、循环利用性以及催化剂失活的原因进行了考察。结果表明,催化剂的酸性对反应的活性有明显的影响,β分子筛具有最优的催化性能(TBHP转化率为100%),且主要产物丙酮的选择性为49%;在28 h的反应周期内,丙酮的选择性明显下降(降低21%),说明催化剂的稳定性较差,但多次(5次)再生活性仍可恢复。通过不同产物预处理催化剂,确定了丙酮的进一步反应是催化剂失活的主要原因;使用无水乙醇稀释TBHP后反应28 h的稳定性明显提高,并且催化剂的反应性能及重复利用性并未受到影响。

关键词：叔丁基过氧化氢催化分解 β分子筛催化剂丙酮制备稳定性丙酮聚合重复利用性

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

基于人工智能的非结构化数据脱敏方法研究

网络安全与数据治理 2023年第S1期42卷 184-190页

作者：袁梦真许潇张彦豪中国人民解放军32366部队北京100040

介绍了数据脱敏技术的相关信息,提出了利用BERT预训练语言模型结合Transformer编码器和条件随机场等人工智能技术处理文字、音频、图像、视频中敏感信息的方法,为解决数据安全和数据共享之间的矛盾提供了思路。

关键词：数据脱敏非结构化数据人工智能

瘤床同步加量调强放疗对乳腺癌保乳术后患者肿瘤标志物及生存质量的影响

在线全文

学校读者我要写书评

暂无评论

中国综合临床 2024年第6期40卷 401-408页

作者：冉杰蒋莎莎袁梦珍荣丽雯赖琼张军四川省成都市第三人民医院肿瘤二科成都610031

目的探讨瘤床同步加量调强放疗(simultaneous integrated boost intensity-modulated radiation therapy, SIB-IMRT)对乳腺癌保乳术后患者肿瘤标志物、生存质量的影响。方法以成都市第三人民医院2015年6月至2018年6月收治的乳腺癌保乳... 详细信息

目的探讨瘤床同步加量调强放疗(simultaneous integrated boost intensity-modulated radiation therapy, SIB-IMRT)对乳腺癌保乳术后患者肿瘤标志物、生存质量的影响。方法以成都市第三人民医院2015年6月至2018年6月收治的乳腺癌保乳术后患者为研究对象, 选择其中常规放射治疗(conventional radiotherapy, CRT)的55例患者纳入对照组, 选取同期SIB-IMRT的患者49例纳入观察组。收集两组患者的放疗时间、放疗相关不良反应;放疗前及放疗后6个月时两组患者血清肿瘤标志物[β2微球蛋白(β2-microglobulin, β2-MG)、糖类抗原125(carbohydrate antigen 125, CA125)、组织多肽特异性抗原(tissue polypeptide specific antigen, TPS)、糖类抗原153(carbohydrate antigen 153, CA153)]的变化;放疗后6个月时近期实体瘤治疗效果;随访两组患者5年生存质量[无进展生存期(progression-free survival, PFS)、总生存时间(overall survival, OS)]。呈正态分布的计量资料以xˉ±s表示, 采用t检验;计数资料采用χ^(2)检验或Fisher检验;等级资料组间比较采用非参数秩和检验。结果观察组患者放疗时间短于对照组[(37.46±6.74)d与(43.63±7.26)d], 观察组放疗相关不良反应发生率低于对照组[14.29%(7/49)与32.73%(18/55)], 组间比较差异均有统计学意义(统计量值分别为4.47、4.83, P值分别为0.05);放疗后6个月, 观察组β2-MG、CA125、TPS、CA153均低于对照组[β2-MG:(1.25±0.21)mg/L与(1.86±0.37)mg/L, CA125:(15.17±2.56)kU/L与(18.81±3.13)kU/L, TPS:(9.43±1.58)μg/L与(13.49±2.51)μg/L, CA153:(11.75±1.63)kU/L与(15.46±3.07)kU/L], 组间比较差异均有统计学意义(t值分别为10.17、6.44、9.73、7.56, 均P0.05);观察组客观缓解率高于对照组[53.06%(26/49)与32.73%(18/55)], 差异有统计学意义(χ^(2)=4.39, P=0.036)。随访5年, 观察组患者生存44例(89.80%, 44/49), OS为(57.92±11.21)个月;对照组患者生存42例(76.36 %, 42/55), OS为(54.05±10.14)个月, 两组比较差异均无统计学意义(均P>0.05)。观察组患者PFS高于对照组[(54.93±10.07)个月与(50.76±9.95)个月], 差异有统计学意义(t=2.12, P=0.036)。结论行保乳术的乳腺癌患者联合瘤床同步加量调强放疗能降低血清肿瘤标志物水平, 改善乳房美观度, 提高患者近、远期生存质量。

关键词：乳腺癌保乳术瘤床同步加量调强放疗肿瘤标志物生存质量

The dopaminergic system and Alzheimer's disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第9期20卷 2495-2512页

作者： Yuhan Zhang yuan Liang Yixue Gu International Medical College Chongqing Medical UniversityChongqingChina College of Pharmacy Chongqing Medical UniversityChongqingChina Department of Neurology The First Affiliated Hospital of Chongqing Medical UniversityChongqing Key Laboratory of NeurologyChongqingChina

Alzheimer's disease is a common neurodegenerative disorder in older *** its prevalence,its pathogenesis remains unclea *** addition to the most widely accepted causes,which in clude excessive amyloid-beta aggregation,tau hyperphosphorylation,and deficiency of the neurotransmitter acetylcholine,numerous studies have shown that the dopaminergic system is also closely associated with the occurrence and development of this *** is a crucial catecholaminergic neurotransmitter in the human ***-associated treatments,such as drugs that target dopamine receptor D and dopamine analogs,can improve cognitive function and alleviate psychiatric symptoms as well as ameliorate other clinical *** r,therapeutics targeting the dopaminergic system are associated with various adverse reactions,such as addiction and exacerbation of cognitive *** review summarizes the role of the dopaminergic system in the pathology of Alzheimer's disease,focusing on currently available dopamine-based therapies for this disorder and the common side effects associated with dopamine-related *** aim of this review is to provide insights into the potential connections between the dopaminergic system and Alzheimer's disease,thus helping to clarify the mechanisms underlying the condition and exploring more effective therapeutic options.

关键词： adverse drug reaction Alzheimer's disease catecholamine dopamine receptor dopamine receptor heterodimers dopaminergic system neurodegenerative disease neurotransmitter signaling pathways traditional Chinese medicine treatment

Toward Analytical Homogenized Relaxation Modulus for Fibrous Composite Material with Reduced Order Homogenization Method

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2025年第1期82卷 193-222页

作者： Huilin Jia Shanqiao Huang Zifeng yuan HEDPS Center for Applied Physics and Technology(CAPT)Department of Mechanics and Engineering SciencePeking UniversityBeijing100871China State Key Laboratory for Turbulence and Complex Systems Peking UniversityBeijing100871China

In this manuscript,we propose an analytical equivalent linear viscoelastic constitutive model for fiber-reinforced composites,bypassing general computational *** method is based on the reduced-order homogenization(ROH)*** ROH method typically involves solving multiple finite element problems under periodic conditions to evaluate elastic strain and eigenstrain influence functions in an‘off-line’stage,which offers substantial cost savings compared to direct computational homogenization *** to the unique structure of the fibrous unit cell,“off-line”stage calculation can be eliminated by influence functions obtained *** the standard solid model to the ROH method enables the creation of a comprehensive analytical homogeneous viscoelastic constitutive *** method treats fibrous composite materials as homogeneous,anisotropic viscoelastic materials,significantly reducing computational time due to its analytical *** approach also enables precise determination of a homogenized anisotropic relaxation modulus and accurate capture of various viscoelastic responses under different loading *** sets of numerical examples,including unit cell tests,three-point beam bending tests,and torsion tests,are given to demonstrate the predictive performance of the homogenized viscoelastic ***,the model is validated against experimental measurements,confirming its accuracy and reliability.

关键词： Homogenized relaxation modulus viscoelastic standard solid model reduced order homogenization fibrous composite material

Optimal Scheduling of an Independent Electro-Hydrogen System with Hybrid Energy Storage Using a Multi-Objective Standardization Fusion Method

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

Energy Engineering 2025年第1期122卷 63-84页

作者： SuliangMa ZeqingMeng Mingxuan Chen yuan Jiang School of Electrical and Control Engineering North China University of TechnologyBeijing100144China ChinaThree Gorges Technology Co. Ltd.Beijing100032China School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing100083China

In the independent electro-hydrogen system(IEHS)with hybrid energy storage(HESS),achieving optimal scheduling is ***,it presents a challenge due to the significant deviations in values ofmultiple optimization objective functions caused by their physical *** deviations seriously affect the scheduling process.A novel standardization fusion method has been established to address this issue by analyzing the variation process of each objective function’s *** optimal scheduling results of IEHS with HESS indicate that the economy and overall energy loss can be improved 2–3 times under different optimization *** proposed method better balances all optimization objective functions and reduces the impact of their *** the cost of BESS decreases by approximately 30%,its participation deepens by about 1 ***,if the price of the electrolyzer is less than 15￥/kWh or if the cost of the fuel cell drops below 4￥/kWh,their participation will increase *** study aims to provide a more reasonable approach to solving multi-objective optimization problems.

关键词： Electro-hydrogen system multi-objective optimization standardization method hybrid energy storage system

Sex differences in aging and injured brain

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

Neural Regeneration Research 2025年第10期20卷 2901-2902页

作者： Jordan N.Williamson yuan Yang University of Illinois Urbana-Champaign Grainger College of EngineeringDepartment of BioengineeringUrbanaILUSA Carle Foundation Hospital Stephenson Family Clinical Research InstituteClinical Imaging Research CenterUrbanaILUSA University of Illinois Urbana-Champaign Beckman Institute for Advanced Science and TechnologyUrbanaILUSA Northwestern University Department of Physical Therapy and Human Movement SciencesChicagoILUSA

Background:The prevalence,age of onset,and symptomatology of traumatic brain injury,stroke,and neurodegenerative diseases(such as Alzheimer’s disease(AD),Parkinson’s disease,amyotrophic lateral sclerosis,and Huntington’s disease)differ substantially between males and *** higher prevalence of these brain disorders has been attributed to females having a greater longevity compared with *** one of the greatest risk factors of acquired brain injury(such as stroke,traumatic brain injury caused by fall)and neurodegenerative disease is age.

关键词： Huntington prevalence traumatic