检索结果-南通市图书馆

Seed-Assisted Synthesis and Catalytic Performance of Nano-sized ZSM-5 Aggregates in a One-Step Crystallization Process

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2020年第4期26卷 292-304页

作者： ziyang wang Yaquan wang Chao Sun Aijuan Zhao Cui wang Xu Zhang Jingjing Zhao Taotao Zhao Wenrong Liu Jiaxin Lu Shuhui Wu Key Laboratory for Green Chemical Technology of Ministry of Education Tianjin 300072China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China

Hierarchical nano-sized ZSM-5 aggregates were successfully synthesized via a seed-assisted method in the presence of cetyltrimethylammonium bromide(CTAB)through a facile one-step crystallization *** ZSM-5 zeolites with a SiO2/Al2O3 ratio comparable to that of ZSM-5 products were treated with alkali and used as the seed *** influences of crystallization conditions were investigated,and the possible synthesis mechanism was ***-5 zeolites with diff erent amounts of CTAB added were characterized using many techniques and evaluated in toluene alkylation with *** results showed that a trace amount of CTAB signifi cantly promoted the crystallization of ZSM-5 zeolite,with the morphology changing from hexagonal-shape crystals to uniform spherical *** may act as the structure-directing agent and assemble the primary crystallites to generate hierarchical ZSM-5 *** ZSM-5 zeolite with the smallest primary particles of 50-80 nm exhibited large specific surface area,abundant mesopores,and the greatest *** hierarchical nano-sized ZSM-5 aggregate showed higher toluene conversion and a longer lifetime without compromising the selectivity to xylene and p-xylene in toluene alkylation with methanol.

关键词： Hierarchical ZSM-5 Nano-sized aggregates Seed-assisted CTAB Toluene alkylation with methanol

A Novel Depression Rehabilitation Game Framework Using VR Based on Neurofeedback

在线全文

学校读者我要写书评

暂无评论

计算机工程 2018年第10期44卷 264-273,280页

作者： CAI Hanshu wang ziyang ZHANG Yanhao CHEN Yunfei HU Bin School of Information Science and Engineering Lanzhou University Center for Excellence in Brain Science and Intelligence Technology Institute of Neuroscience Under Chinese Academy of Sciences Beijing Institute for Brain Disorders Capital Medical University

At present,depression is treated with antidepressant drugs and assisted with psychotherapy and physical therapy,and these expensive and time-consuming treatment methods often end prematurely and result in a prolonged course w ithout effective symptom relief. Therefore,based on the neurofeedback therapy,a novel depression rehabilitation method using a Virtual-Reality(VR) game framew ork is proposed. In this VR game framew ork,an innovative threeelectrode Electroencephalography(EEG) collector is used to record patients' EEG data. The data are processed and converted into feedback features,and the feedback w ill be displayed to patients in real time through a VR headset. Patients can adjust their psychological activity based on the feedback,and relieve their physiological dysfunction effectively. The framew ork also provides a data storage module,w hich may offer therapists w ays to assess patients' rehabilitation results in a long term,as w ell as provide possibility to continue tow ards better algorithm of feedback features w ith *** prototype system is tested in the framew ork,and the experimental results prove the effectiveness of the framew ork in depression rehabilitation.

关键词： Virtual-Reality(VR) neurofeedback depression rehabilitation framework regulation

基于人工智能深度学习算法辅助诊断早期ESCC的研究

在线全文

学校读者我要写书评

暂无评论

胃肠病学和肝病学杂志 2024年第2期33卷 156-161页

作者：王娜温静冯佳卢娜利刘翠华智佳王子阳黄锦新乡医学院研究生院河南新乡453003 中国人民解放军联勤保障部队第九八八医院消化内科中国人民解放军联勤保障部队第九八四医院消化内科中国人民解放军联勤保障部队第九八〇医院消化内科

目的探讨基于人工智能(artificial intelligence,AI)深度学习算法的内镜识别系统在胃镜诊疗过程中对早期ESCC检出率的研究。方法选取中国人民解放军联勤保障部队第九八八医院、中国人民解放军联勤保障部队第九八四医院及中国人民解放军... 详细信息

目的探讨基于人工智能(artificial intelligence,AI)深度学习算法的内镜识别系统在胃镜诊疗过程中对早期ESCC检出率的研究。方法选取中国人民解放军联勤保障部队第九八八医院、中国人民解放军联勤保障部队第九八四医院及中国人民解放军联勤保障部队第九八〇医院三个消化内镜中心2018年6月至2020年6月早期ESCC、ESCC、食管隆起性病变以及食管憩室的白光图像、碘染色图像。通过训练和验证不同的目标检测模型和实例分割模型,最终选取表现最优的目标检测模型Yolov 5和实例分割模型Yolact++共同构建AI“嵌合模型”,评估该模型诊断早期ESCC的性能。结果AI“嵌合模型”对早期ESCC诊断的敏感度为95.60%,特异度为91.60%,准确率为90.70%,均优于单模型。结论本研究构建的AI“嵌合模型”可显著提高早期ESCC的检出率。

关键词：人工智能深度学习实例分割食管鳞状细胞癌碘染色

***技术提高肺结节PET/CT图像质量和定量准确性的临床研究

在线全文

学校读者我要写书评

暂无评论

中华核医学与分子影像杂志 2024年第2期44卷 98-103页

作者：戴东刘建井卢笛隋国庆王亚亚刘雪瑶岳园芳杨震杨晴付杰徐文贵王子阳天津医科大学肿瘤医院分子影像与核医学诊疗科、国家恶性肿瘤临床医学研究中心、天津市恶性肿瘤临床医学研究中心、天津市肿瘤防治重点实验室天津300060 天津市肿瘤医院空港医院核医学科、国家恶性肿瘤临床医学研究中心天津300308

目的对比肺结节五维(5D)全息***和常规三维(3D)PET/CT图像质量和代谢参数的差异,评估其临床实用价值。方法回顾性收集2022年6月至2022年8月间于天津市肿瘤医院空港医院因可疑肺小结节而行PET/CT显像的54例患者[男30例,女24例;年龄60(42,... 详细信息

目的对比肺结节五维(5D)全息***和常规三维(3D)PET/CT图像质量和代谢参数的差异,评估其临床实用价值。方法回顾性收集2022年6月至2022年8月间于天津市肿瘤医院空港医院因可疑肺小结节而行PET/CT显像的54例患者[男30例,女24例;年龄60(42,75)岁;共78个^(18)F-FDG高代谢实性肺结节(最大径≤3 cm)]的资料。所有患者接受5D PET扫描及3D、5D图像重建。比较5D和3D组间PET图像质量主观评分和信噪比(SNR),同时对比2组肺结节的定量参数:SUV_(max)、SUV_(mean)和肿瘤代谢体积(MTV)。组间差异采用χ^(2)检验、Wilcoxon符号秩检验比较,相关性分析采用Spearman秩相关分析。结果5D组图像质量视觉评估≥4分的百分比和肺结节SNR明显高于3D组,分别为45%(35/78)和28%(22/78)(χ^(2)=4.67,P=0.031)、37.46(18.42,62.00)和32.72(16.97,54.76)(z=-4.07,P10 mm且≤20 mm的结节的5D定量参数较3D参数变化最明显(z值:-5.23~-2.48,均P<0.05)。结论*** 5D PET明显改善肺结节SUV和代谢体积的定量准确度,且图像质量清晰,不增加辐射剂量,具有临床实用价值。

关键词：孤立性肺结节多发性肺结节图像处理,计算机辅助正电子发射断层显像术体层摄影术,X线计算机

彩色多普勒血流显像在儿童眼弓蛔虫病诊断中的应用

在线全文

学校读者我要写书评

暂无评论

中华眼底病杂志 2024年第1期40卷 39-43页

作者：陈伟杨文利刘敬花李栋军王子杨赵琦李逸丰崔蕊沈琳刘倩首都医科大学附属北京同仁医院、北京同仁眼科中心、北京市眼科学与视觉科学重点实验室北京100730

目的观察儿童眼弓蛔虫病(OT)的彩色多普勒血流显像(CDFI)特征。方法回顾性临床研究。2014年7月至2020年6月于首都医科大学附属北京同仁医院眼科经临床和实验室检测确诊的OT患者61例61只眼纳入研究。其中,男性45例45只眼,女性16例16只眼... 详细信息

目的观察儿童眼弓蛔虫病(OT)的彩色多普勒血流显像(CDFI)特征。方法回顾性临床研究。2014年7月至2020年6月于首都医科大学附属北京同仁医院眼科经临床和实验室检测确诊的OT患者61例61只眼纳入研究。其中,男性45例45只眼,女性16例16只眼(男∶女=2.81∶1);年龄(6.93±2.50)岁。右眼、左眼分别为29、32只眼。患者双眼均行二维超声、CDFI检查。采用二维超声估测患眼及对侧健康眼眼轴长度(AL),其中采用光学生物测量仪和(或)A型超声测量AL者52例。超声检查后1周内行玻璃体视网膜手术。应用二维超声观察玻璃体内混浊形态、与眼球壁相连情况、是否发生玻璃体后脱离及视网膜脱离。应用血流显像功能观察病理膜上是否存在血流信号,统计不同形态玻璃体混浊及牵拉性视网膜脱离的检出率;分析眼内增生性病变所在位置。患眼与对侧健康眼AL比较行配对t检验。对CDFI检查及玻璃体视网膜手术中所见增生性病变位置行Kappa一致性检验。结果所有患眼均存在不同程度玻璃体混浊。其中,混浊呈典型"圣诞树样"23只眼(37.7%,23/61);团状及条状回声27只眼(44.3%,27/61);细弱点状及条状回声9只眼(14.8%,9/61);大量致密点状及条状回声2只眼(3.3%,2/61)。存在牵拉性视网膜脱离50只眼(82.0%,50/61),其中条带状回声可探及血流信号46只眼(92.0%,46/50);未见明显血流信号4只眼(8.0%,4/50)。CDFI、手术中可见眼内增生性病变分布于周边部者分别为5(8.2%,5/61)、4(6.6%,4/61)只眼;后极部者分别为18(29.5%,18/61)、14(23.0%,14/61)只眼;周边部及后极部均存在者分别为38(62.3%,38/61)、43(70.5%,43/61)只眼。CDFI、手术中对增生性病变位置检出的一致性较好(κ=0.832,95%可信区间0.691~0.973,P<0.001)。二维超声测量结果显示,患眼AL小于对侧健康眼者46例(75.4%,46/61)。行AL生物测量的52例,患眼AL较对侧健康眼短(0.63±0.68)mm,差异有统计学意义(t=-6.738,P<0.05)。结论CDFI可清晰显示儿童OT的玻璃体混浊和牵拉性视网膜脱离等各种眼内病变及眼球大小;玻璃体混浊多表现为"圣诞树样"或团状、条状。

关键词：彩色多普勒血流显象眼弓蛔虫病儿童

Vibration and noise mechanism of a 110 kV transformer under DC bias based on finite element method

在线全文

学校读者我要写书评

暂无评论

Global Energy Interconnection 2024年第4期7卷 503-512页

作者： ziyang Li Xujun Lang Bo Yang Xiaolin Liu Hao wang Zhang Li Shandong Electric Power Engineering Consulting Institute Co. Ltd.Jinan 250013P.R.China School of Electrical Engineering Shandong UniversityJinan 250061P.R.China

Global energy and environmental issues are becoming increasingly problematic,and the vibration and noise problem of 110 kV transformers,which are the most widely distributed,have attracted widespread attention from both inside and outside the *** bias is one of the main contributing factors to vibration noise during the normal operation of *** clarify the vibration and noise mechanism of a 110 kV transformer under a DC bias,a multi-field coupling model of a 110 kV transformer was established using the finite element *** electromagnetic,vibration,and noise characteristics during the DC bias process were compared and quantified through field circuit coupling in parallel with the power frequency of AC,harmonic,and DC power *** was found that a DC bias can cause significant distortions in the magnetic flux density,force,and displacement distributions of the core and *** contributions of the DC bias effect to the core and winding are different at Kdc=*** this point,the core approached saturation,and the increase in the core force and displacement ***,the saturation of the core increased the leakage flux,and the stress and displacement of the winding increased *** sound field distribution characteristics of the 110 kV transformer under a DC bias are related to the force *** the DC bias coefficient was 1.25,the noise sound pressure level reached 73.6 dB.

关键词： Transformer DC bias Vibration Noise

在线全文

学校读者我要写书评

暂无评论

河北某铁矿塔磨机粗磨磨矿指标优化研究

现代矿业 2024年第5期40卷 115-118,123页

作者：吕虹序王子扬侯英陈鹏李晨邹存存辽宁科技大学矿业工程学院

河北某铁矿为了降低塔磨机磨矿能耗,以高压辊磨机粉碎后的预选精矿为研究对象,进行了塔磨机磨矿操作参数对磨矿指标的影响研究。研究结果表明:优化后的操作参数为磨矿时间240 s,螺旋搅拌器转速320 r/min,介质充填率20.77%,磨矿浓度65%,... 详细信息

河北某铁矿为了降低塔磨机磨矿能耗,以高压辊磨机粉碎后的预选精矿为研究对象,进行了塔磨机磨矿操作参数对磨矿指标的影响研究。研究结果表明:优化后的操作参数为磨矿时间240 s,螺旋搅拌器转速320 r/min,介质充填率20.77%,磨矿浓度65%,料球比0.15,介质配比(φ8 mm钢球质量占比)100%;在最优参数下,获得了磨机-0.074 mm利用系数为0.916 t/(m~3.h)和磨矿能耗为42.82(kW.h)/t的磨矿指标,优化后磨机-0.074 mm利用系数提高1.55%,磨矿能耗降低11.58%。该研究结果可为塔磨机磨矿能耗的降低和磨矿操作参数的选取提供有益参考。

关键词：塔磨机磨矿因素磨矿指标

Comparison of Mortality Predictive Models of Sepsis Patients Based on Machine Learning

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Sciences Journal 2022年第3期37卷 201-209,I0005页

作者： ziyang wang Yushan Lan Zidu Xu Yaowen Gu Jiao Li Institute of MedicaI Information/Medical Library Chinese Academy of Medical Science&Peking Union Medical CollegeBeijing 100020China

Objective To compare the performance of five machine learning models and SAPSⅡ score in predicting the 30-day mortality amongst patients with *** The sepsis patient-related data were extracted from the MIMIC-Ⅳ *** features were generated and selected by mutual information and grid *** regression,Random forest,LightGBM,XGBoost,and other machine learning models were constructed to predict the mortality *** measurements including accuracy,precision,recall,F1 score,and area under curve(AUC) were acquired for model *** external validation was implemented to avoid conclusion *** LightGBM outperformed other methods,achieving the highest AUC(0.900),accuracy(0.808),and precision(0.559).All machine learning models performed better than SAPSⅡ score(AUC=0.748).LightGBM achieved 0.883 in AUC in the external data *** The machine learning models are more effective in predicting the 30-day mortality of patients with sepsis than the traditional SAPS Ⅱ score.

关键词： MIMIC-Ⅳ sepsis machine learning risk prediction

A process insight into production of ethyl levulinate via a stepwise fractionation

在线全文

学校读者我要写书评

暂无评论

Journal of Bioresources and Bioproducts 2024年第2期9卷 233-242页

作者： Yan Ma Hongxiao wang ziyang Wu Weihong Tan Guodong Feng Jianchun Jiang Institute of Chemical Industry of Forest Products Chinese Academy of ForestryNanjing 210042China Jiangsu Province Key Lab.of Biomass Energy and Material Nanjing 210042China National Engineering Lab.for Biomass Chemical Utilization Nanjing 210042China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China

Ethyl levulinate(EL)is a key biomass-derived compounds due to its socio-economic benefits for the synthesis of commodity ***,we proposed an efficient one-step bamboo conversion to EL in ethanol,and a novel stepwise fractionation to purify EL and lignocellulose degradation products.A proton acid,due to its high catalytic efficiency,yielded 26.65%EL in 120 min at 200℃.The productions of ethyl glucoside and 5-ethoxymethylfurfural were analyzed in terms of by-products *** the best of our knowledge,there is no single report on catalyst for one step synthesis of EL directly from bamboo,as well as a stepwise fractionation to purify *** to similar physiochemical properties in each fraction,the platform molecules could broaden a new paradigm of bamboo biomass utilization for renewable energy and value-added *** addition,glucose,ethyl glucoside,corn starch,and microcrystalline cellulose were also investigated as substrates,so that the reaction intermediates of this one-pot procedure were identified and a possible reaction mechanism was proposed.

关键词： Ethyl levulinate Liquefaction Biomass Ethanol By-products