检索结果-南通市图书馆

Enhancing Green Ammonia Electrosynthesis Through Tuning sn Vacancies in sn‑Based MXene/ MAX Hybrids

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

nano-Micro Letters 2024年第5期16卷 154-168页

作者： Xinyu Dai Zhen‑Yi Du Ying sun Ping Chen Xiaoguang Duan Junjun Zhang Hui Li Yang Fu baohua Jia Lei Zhang Wenhui Fang Jieshan Qiu Tianyi Ma Key Laboratory for Green synthesis and Preparative Chemistry of Advanced Materials of Liaoning Province College of ChemistryInstitute of Clean Energy ChemistryLiaoning UniversityShenyang 110036People’s Republic of China state Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China school of Chemistry and Chemical Engineering Anhui UniversityHefei 230601People’s Republic of China school of Chemical Engineering The University of AdelaideAdelaideSA 5005Australia state Key Laboratory of High‑Efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021NingxiaPeople’s Republic of China school of science RMIT UniversityMelbourneVIC 3000Australia Guangdong Provincial Key Laboratory of Advanced Energy storage Materials School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640People’s Republic of China College of Chemical Engineering State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Renewable energy driven n_(2) electroreduction with air as nitrogen source holds great promise for realizing scalable green ammonia ***,relevant out-lab research is still in its ***,a novel sn-based MXene/MAX hybrid with abundant sn vacancies,sn@Ti_(2)CTX/Ti_(2)snC–V,was synthesized by controlled etching sn@Ti_(2)snC MAX phase and demonstrated as an efficient electrocatalyst for electrocatalytic n2 *** to the synergistic effect of MXene/MAX heterostructure,the existence of sn vacancies and the highly dispersed sn active sites,the obtained sn@Ti2CTX/Ti_(2)snC–V exhibits an optimal nH_(3) yield of 28.4μg h^(−1) mg_(cat)^(−1) with an excellent FE of 15.57% at−0.4 V versus reversible hydrogen electrode in 0.1 M na_(2)sO_(4),as well as an ultra-long ***,this catalyst represents a satisfactory nH3 yield rate of 10.53μg h^(−1) mg^(−1) in the home-made simulation device,where commercial electrochemical photovoltaic cell was employed as power source,air and ultrapure water as feed *** as-proposed strategy represents great potential toward ammonia production in terms of financial cost according to the systematic technical economic *** work is of significance for large-scale green ammonia production.

关键词： Green ammonia synthesis n2 electroreduction Renewable energy sn MXene/MAX hybrid

Prediction of specific spoilage organisms in smoked chicken legs with modified atmosphere packaging at 4 ℃ using multivariate statistical analysis

在线全文

学校读者我要写书评

暂无评论

Food science and Human Wellness 2024年

作者： Qiang Wang Yubo Zhao Yumeng sui Qian Chen Zhiming Dong Qian Liu baohua Kong Ligang Qin College of Animal science and Technology northeast Agricultural University College of Food science northeast Agricultural University

The present study monitored bacterial succession， physicochemical properties， and volatile organic compounds (VOCs) changes in smoked chicken legs with modified atmosphere packaging (MAP， 60% CO2and 40% n2) during a 25-day storage period at 4 ℃. After 15 days of storage， serratia proteamaculans and Pseudomonas fragi became the predominant bacteria. Furthermore， physicochemical properties changed significantly， as evidenced by an increase in thiobarbituric acid reactive substances and b* (yellowness) value， and a decrease in hardness. A total of 65 VOCs were identified during storage. Correlation between bacterial succession and quality indicators (including VOCs and physicochemical properties) allowed the identification of 26 core dominant bacteria， including s. proteamaculans， Psychrobacter alimentarius， Pseudomonas putide， and Pseudomonas poae， which were positively related to spoilage VOCs (e.g.， 1-octen-3-ol， 1-pentanol， and 3-methyl-1-butanol) and could be defined as specific spoilage organisms (ssOs). The results of this study provide a systematic approach to predict ssOs in smoked chicken legs during storage， which can also provide a basis for product safety.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

正方形布置四圆柱结构流致振动响应特性研究

力学学报 2024年第3期56卷 670-681页

作者：胡中明王嘉松孙远坤郑瀚旭范迪夏黄淮学院建筑工程学院河南驻马店463000 上海交通大学船舶海洋与建筑工程学院上海201100 西湖大学工学院杭州310030

通过风洞实验研究了正方形布置四圆柱的流致振动特性,实验雷诺数Re=3200~28900,圆柱间距比s/D=1.5~4.0(s为两圆柱圆心间距,D为圆柱直径),质量比m^(*)≈345.0.结果表明,当s/D≤2.0时,上游圆柱1和2呈现涡激振动和类弛振耦合响应,下游圆柱3... 详细信息

通过风洞实验研究了正方形布置四圆柱的流致振动特性,实验雷诺数Re=3200~28900,圆柱间距比s/D=1.5~4.0(s为两圆柱圆心间距,D为圆柱直径),质量比m^(*)≈345.0.结果表明,当s/D≤2.0时,上游圆柱1和2呈现涡激振动和类弛振耦合响应,下游圆柱3和4呈现涡激共振和尾流弛振耦合响应;当s/D=2.5~3.0,上游圆柱1和2除了在约化速度超过一定值时存在弱振动外,基本接近单圆柱涡激振动响应,下游圆柱3和4表现为分离的涡激共振和尾流弛振响应;当s/D=4.0时,上游圆柱1和2振动响应几乎和单圆柱一样,而圆柱3和4仍呈现分离的涡激共振和尾流弛振响应.当圆柱呈现涡激振动(上游圆柱)或涡激共振(下游圆柱)时,涡脱频率f_(s)锁定于固有频率f_(n)的1倍谐频,而当圆柱呈现剧烈的类弛振响应(上游圆柱)或尾流弛振响应(下游圆柱)时,f_(s)则会出现明显的多倍谐频;圆柱模型振动频率f_(o)主频始终锁定于fn的1倍谐频.通过对比正方形四圆柱和双圆柱流致振动特性,发现双圆柱动力学响应规律在一定程度上仍适用于正方形布置四圆柱.

关键词：流致振动风洞实验正方形四圆柱涡激振动流固耦合

同方期刊数据库

2型糖尿病患者冠状动脉病变严重程度的相关因素

在线全文

学校读者我要写书评

暂无评论

中国临床研究 2024年第6期37卷 861-865页

作者：朱宝华孙艳君李敏山东第一医科大学附属人民医院、济南市人民医院全科医学科山东济南271100

目的对2型糖尿病(T2DM)患者冠状动脉病变严重程度的相关因素进行分析,以期为其风险评估提供参考。方法回顾性分析2019年1月至2023年5月济南市人民医院收治的322例T2DM合并冠状动脉疾病患者的临床资料,根据Gensini评分分为轻度组(≤54分,... 详细信息

目的对2型糖尿病(T2DM)患者冠状动脉病变严重程度的相关因素进行分析,以期为其风险评估提供参考。方法回顾性分析2019年1月至2023年5月济南市人民医院收治的322例T2DM合并冠状动脉疾病患者的临床资料,根据Gensini评分分为轻度组(≤54分,n=177)和中重度组(>54分,n=145),对比两组患者的年龄、性别、血液指标等临床资料,采用logistic回归分析和最小绝对收缩和选择算子(LAssO)回归法筛选与T2DM患者冠状动脉病变严重程度的相关性因素,构建预测模型,绘制模型校准曲线和受试者工作特征曲线(ROC)并计算曲线下面积(AUC)评价其准确性。结果中重度组患者年龄及总胆固醇、空腹血糖、残余胆固醇、血清脂蛋白a[Lp(a)]水平均高于轻度组患者(Pstic回归分析结果显示年龄(Z=3.251,P=0.001)、残余胆固醇(Z=2.564,P=0.010)和血清Lp(a)(Z=7.989,P1)水平是其独立危险因素(PssO回归结果显示,年龄、残余胆固醇和血清Lp(a)水平是其独立预测因素(P<0.05),由上述因素构建的列线图预测模型准确性较好(AUC=0.826)。结论年龄、残余胆固醇和血清Lp(a)水平可有效预测T2DM患者冠状动脉病变的严重程度,且准确性较好。

关键词： 2型糖尿病冠状动脉病变年龄残余胆固醇脂蛋白a

不同频次无抽搐电休克治疗抑郁障碍患者疗效及对认知功能、fnRIs的影响

在线全文

学校读者我要写书评

暂无评论

中国基层医药 2024年第8期31卷 1133-1138页

作者：戴红祖鑫郭伶俐宋宝华湖州市第三人民医院精神科湖州湖州市第三人民医院物理治疗中心湖州湖州市第三人民医院心身障碍科湖州

目的观察不同频次无抽搐电休克(MECT)治疗对抑郁障碍患者的疗效及认知功能、近红外脑功能成像(fnRIs)的影响。方法回顾性选取2022年12月至2023年7月湖州市第三人民医院收治的抑郁障碍患者60例的临床资料, 采用病例对照研究, 根据治疗方... 详细信息

目的观察不同频次无抽搐电休克(MECT)治疗对抑郁障碍患者的疗效及认知功能、近红外脑功能成像(fnRIs)的影响。方法回顾性选取2022年12月至2023年7月湖州市第三人民医院收治的抑郁障碍患者60例的临床资料, 采用病例对照研究, 根据治疗方式不同分为治疗1组、治疗2组与治疗3组, 每组20例, 三组患者均接受常规抗抑郁药物治疗, 其中治疗1组在常规治疗基础上接受6次MECT治疗, 治疗2组为8次MECT治疗, 治疗3组为10次MECT治疗, 三组患者治疗时间均为4周。比较三组患者治疗前后的汉密尔顿抑郁评分(HAMD-24)、汉密尔顿焦虑评分(HAMA-14)、临床疗效(CGI)评分、简易智力状态(MMsE)评分、威斯康星卡片分类测验(WCsT)评分、连线测验A(TMTA)评分、连线测验B(TMTB)评分、数字符号转换测验(DssT)评分, 统计患者治疗期间出现的不良反应, 并采用副反应量表(TEss)评估药物不良反应发生情况;另外于治疗前后采用fnRIs在言语流畅性任务(VFT)下评估患者的认知功能。结果治疗1周、2周及4周, 治疗2组与治疗3组HAMD-24、HAMA-14及CGI评分均低于治疗1组, 差异均有统计学意义(F组间=32.09, F时间=54.27, F交互=7.53, 均P 14, F时间=69.33, F交互=8.59, 均P 11.22, F时间=28.29, F交互=9.14, 均P 1组与治疗2组MMsE、WCsT及DssT评分均高于治疗3组, TMTA、TMTB评分均低于治疗3组, 差异均有统计学意义(F组间=14.20, F时间=44.27, F交互=6.24, 均P 18.23, F时间=67.15, F交互=8.54, 均P 16, F交互=9.41, 均P 19.47, F时间=85.76, F交互=9.33, 均P 1.25, 均P > 0.05)。治疗4周后治疗2组患者VFT下组词个数及oxy-Hb水平均高于治疗1组与治疗3组, 差异均有统计学意义(F=29.71, 198.57, 均P nRIs改善情况更佳。

关键词：抑郁症电休克认知功能障碍谱学, 近红外线疗效比较研究药物相关性副作用和不良反应

Integrated Electrode-Electrolyte Optimization to Manufacture a Real-Life Applicable Aqueous supercapacitor with Record-Breaking Lifespan

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2023年第4期6卷 78-88页

作者： Jichi Liu Chongchong Wu Ian D.Gates baohua Jia Zihang Huang Tianyi Ma Key Laboratory for Green synthesis and Preparative Chemistry of Advanced Materials of Liaoning Province College of ChemistryInstitute of Clean Energy ChemistryLiaoning UniversityShenyang 110036China CnOOC Institute of Chemicals and Advanced Materials Beijing 102200China Department of Chemical and Petroleum Engineering University of CalgaryCalgaryT2N1N4AB Canada school of science RMIT UniversityMelbourne VIC 3000Australia

Aqueous supercapacitors(sCs)have been regarded as a promising candidate for commercial energy storage device due to their superior safety,low cost,and environmental ***,an age-old challenge of achieving both long electrode lifespan and qualified energy-storage property blocks their practical ***,we develop an electrode-electrolyte integrated optimization strategy to fulfill the real-life device *** optimization simultaneously regulates the nanomorphology and surface chemistry of the tungsten oxide anode,resulting in superior electrochemical performance given by an ideal“bird-nest”structure with optimal oxygen vacancy status;the anodes interact with and are protected from dissolution and structural collapse by the rationally designed hybrid electrolyte with optimized pH and facilitated cation desorption ***,a record-breaking durability of no capacitive decay after 250000 cycles is *** the basis of this integrated optimization,the first aqueous pouch sCs with real-life practicability were manufactured by a soft-package encapsulation technique,which can steadily power commercial 3 C products such as tablets and smartphones and maintain safely working against extreme *** work demonstrates the possibility of using aqueous energy storage devices with enhanced safety and lower cost to replace the commercial organic counterparts for wide range of daily applications.

关键词： integrated electrode-electrolyte optimization real-life applicable supercapacitor record-breaking lifespan

Influence of nuclear physics inputs on the Th/U chronometer

在线全文

学校读者我要写书评

暂无评论

Influence of nuclear physics inputs on the Th/U chronometer

贝叶斯神经网络方法对原子核β衰变寿命的研究

第十四届全国核物理大会暨第十届会员代表大会

作者： zhongming niu1 baohua s.n2 3 Jie Meng1 2 4 1 state Key Laboratory of nuclear Physics and Technology, school of Physics, Peking University, Beijing 100871, People’s Republic of China 2 school of Physics and nuclear Energy Engineering, Beihang University, Beijing 100191, People’s Republic of China 3 Justus-Liebig-Universit?t Giessen, Heinrich-Buff-Ring 14, D-35392 Giessen, Germany 4 Department of Physics, University of stellenbosch, stellenbosch, south Africa

The productions of thorium and uranium are key ingredients in r-process *** the combination of improved nuclear and stellar data,we have made a detailed investigation of the r-process abundance pattern in the very met... 详细信息

关键词： chronometer r-process nuclear masses metal-poor stars

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

核技术 2023年第8期46卷 122-129页

作者：李伟峰张晓燕牛中明安徽大学物理与光电工程学院合肥230601

β衰变寿命是原子核的基本物理性质之一,在原子核物理与核天体物理中都起着重要作用。本文利用贝叶斯神经网络(Bayesian neural network,Bnn)方法预测原子核的β衰变寿命及其不确定性。研究发现,在神经网络输入层引入β衰变能以及与原... 详细信息

β衰变寿命是原子核的基本物理性质之一,在原子核物理与核天体物理中都起着重要作用。本文利用贝叶斯神经网络(Bayesian neural network,Bnn)方法预测原子核的β衰变寿命及其不确定性。研究发现,在神经网络输入层引入β衰变能以及与原子核对效应相关的物理量,并采用β衰变寿命的对数作为网络输出,可以显著提高学习精度。对于寿命小于1 s的原子核,其预言精度约为0.2个数量级,取得了与Bnn方法学习β衰变寿命的实验值和理论值的对数之差相当的精度。当外推至未知核区,其预言的β衰变寿命在误差范围内与其他理论模型的结果符合较好,尤其是对于Z≳50的原子核。

关键词： β 衰变寿命神经网络贝叶斯方法

nonlinear local Lyapunov exponent and atmospheric predictability research

在线全文

学校读者我要写书评

暂无评论

science China Earth sciences 2006年第10期49卷 1111-1120页

作者： CHEn baohua1, LI Jianping1,2 & DInG Ruiqiang2 1. College of Atmospheric sciences, Lanzhou University, Lanzhou 730000, China 2. state Key Laboratory of numerical Modeling for Atmospheric science and Geophysical Fluid Dynamics (LAsG), Institute of Atmospheric Physics, Chinese Academy of sciences, Beijing 100029, China College of Atmospheric sciences Lanzhou University Lanzhou China state Key Laboratory of numerical Modeling for Atmospheric science and Geophysical Fluid Dynamics (LAsG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China

Because atmosphere itself is a nonlinear system and there exist some problems using the linearized equations to study the initial error growth, in this paper we try to use the error nonlinear growth theory to discuss its evolution, based on which we first put forward a new concept: nonlinear local Lyapunov exponent. It is quite different from the classic Lyapunov exponent because it may characterize the finite time error local average growth and its value depends on the initial condition, initial error, variables, evolution time, temporal and spatial scales. Based on its definition and the at-mospheric features, we provide a reasonable algorithm to the exponent for the experimental data, obtain the atmospheric initial error growth in finite time and gain the maximal prediction time. Lastly, taking 500 hPa height field as example, we discuss the application of the nonlinear local Lyapunov exponent in the study of atmospheric predictability and get some reliable results: atmospheric predictability has a distinct spatial structure. Overall, predictability shows a zonal distribution. Prediction time achieves the maximum over tropics, the second near the regions of Antarctic, it is also longer next to the Arctic and in subtropics and the mid-latitude the predictability is lowest. Particularly speaking, the average prediction time near the equation is 12 days and the maximum is located in the tropical Indian, Indonesia and the neighborhood, tropical eastern Pacific Ocean, on these regions the prediction time is about two weeks. Antarctic has a higher predictability than the neighboring latitudes and the prediction time is about 9 days. This feature is more obvious on southern Hemispheric summer. In Arctic, the predictability is also higher than the one over mid-high latitudes but it is not pronounced as in Antarctic. Mid-high latitude of both Hemispheres (30°s―60°s, 30°―60°n) have the lowest predictability and the mean prediction time is just 3―4 d. In addition, predictab

关键词： nonlinear, local, Lyapunov exponent, atmospheric predictability, maximal prediction time.