检索结果-南通市图书馆

官能团修饰的二维共价有机骨架中二氧化碳捕获与分离性能的理论计算

在线全文

学校读者我要写书评

暂无评论

无机化学学报 2025年第2期41卷 275-283页

作者：赵杰张慧丽鲁效庆王兆杰管网集团(新疆)联合管道有限责任公司乌鲁木齐830000 中国石油大学(华东)材料科学与工程学院青岛266580

通过引入—OH、—NH2和—SO_(3)H极性官能团,设计了具有高比表面积、亚胺键连接的二维三聚茚酮基共价有机骨架(truxenone-based covalent organic frameworks,TRO-COFs),并通过巨正则蒙特卡洛(giant canonical Monte Carlo,GCMC)模拟和密度泛函理论(density functional theory,DFT)探究了298 K和0~1.0×10^(5)Pa条件下极性官能团对TRO-COFs的CO_(2)捕获性能的影响。结合能和内聚能的分析表明官能团引入后结构仍保持较高的稳定性。极性官能团的引入显著增强了TRO-COFs的CO_(2)吸附性能。CO_(2)吸附量大小顺序为TRO-COF-SO_(3)H>TRO-COF-NH2>TRO-COF-OH>TRO-COF-H。在298 K和1.0×10^(5)Pa条件下,TRO-COF-SO_(3)H表现出8.02 mmol·g^(-1)的CO_(2)吸附量及CO_(2)优于N_(2)和CH_(4)的选择性(37和26)。同时,通过径向分布函数和气体吸附密度分布也进一步说明了不同极性官能团对CO_(2)捕获与分离性能影响的差异。最后,从吸附热、范德瓦耳斯力和库仑相互作用等多个角度详细阐明了极性官能团的作用机制。

关键词：共价有机骨架 CO_(2)捕获与分离密度泛函理论巨正则蒙特卡洛

On-chain is not enough:Ensuring pre-data on the chain credibility for blockchain-based source-tracing systems

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2023年第5期9卷 1053-1060页

作者： Yilei wang zhaojie wang Guoyu Yang Shan Ai Xiaoyu Xiang Chang Chen Minghao Zhao School of Computer Science Qufu Normal UniversityRizhao276826China Guangxi Key Laboratory of Cryptography and Information Security Guilin University of Electronic TechnologyGuilin541004China Institute of Artificial Intelligence and Blockchain Guangzhou UniversityGuangzhou510006China School of Software Tsinghua UniversityTsinghua UniversityBeijing100191China

The blockchain provides a reliable and scalable method for enabling source-tracing functionality in large-scale Internet of Things(IoT)*** blockchain-based source tracing applications are generally based on the hypothesis that the raw data collected by each IoT node are credible and consistent,which however may not always be the *** no mechanism ensures the reliability of the original data collected from the IoT devices,these data may be accidently screwed up or maliciously tampered with before they are uploaded *** address this issue,we propose the Multi-dimensional Certificates of Origin(MCO)method to filter out the potentially incredible data-till all the data uploaded to the chain are *** achieve this,we devise the Multidimensional Information Cross-Verification(MICV)and Multi-source Data Matching Calculation(MDMC)*** verifies whether a to-be-uploaded datum is consistent or credible,and MDMC determines which data should be discarded and which data should be kept to retain the most likely credible/untampered ones in the circumstance when data inconsistency ***-scale experiments show that our scheme ensures on the credibility of data and off the chain with an affordable overhead.

关键词： Blockchain Traceability Blockchain security

Carbon quantum dot-induced self-assembly of ultrathin Ni（OH）2 nanosheets： A facile method for fabricating three-dimensional porous hierarchical composite micro-nanostructures with excellent supercapacitor performance

在线全文

学校读者我要写书评

暂无评论

Nano Research 2017年第9期10卷 3005-3017页

作者： Guijuan Wei Kun Du Xixia Zhao zhaojie wang Ming Liu Chuang Li Hui wang Changhua An Wei Xing State Key Laboratory of Heavy Oil Processing College of Science and College of Chemical Engineering China University of Petroleum Qingdao 266580 China Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion College of Chemistry and Chemical Engineering TianfinUniversity of Technology Tianjin 300384 China

Significant efforts have been directed towards the preparation and application of porous hierarchically structured materials owing to their large surface area, rich active sites, and enhanced mass transport and diffusion. In this study, a simple and cost-effective method for the carbon quantum dot (CQD)-induced assembly of two-dimensional ultrathin Ni(OH)2 nanosheets into a three-dimensional (3D) porous hierarchical structure was developed. The electrostatic forces between the CQDs and cations drove the self-assembly of the 3D CQDs/Ni(OH)2 hierarchical structures. As a new type of structure-directing agent, the CQDs played dual roles in tuning the morphology of the products and improving the supercapacitor performance. The multilevel CQDs/Ni(OH)2 micro-nanostructures had a large specific surface area and rich porosity. Owing to their unique structures and the conductivity of the CQDs, an optimized asymmetric supercapacitor using the CQDs/Ni(OH)2 exhibited a maximum specific capacity of 161.3 F·g–1 and a high energy density of 57.4 Wh·kg–1. This study introduces a potential method for the fabrication of many other 3D hierarchical structures with great potential for applications in various fields.

关键词： carbon self-assembly hierarchical structures energy storage

Crystallographic studies on the binding of coenzyme analogs to D-glyceraldehyde-3-phosphate dehydrogenase from Palinurus versicolor

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 Science Bulletin 2000年第13期45卷 1199-1202页

作者： Yuequan Shen zhaojie wang Shiying Song Junmei Zhou Zhengjiong Lin Chinese Acad Sci Inst Biophys State Key Lab Biomacromol Beijing 100101 Peoples R China

In contrast with the coezyme, two coenzyme analogs, ADP-ribose and SNAD, bind non-cooperatively to D-glyceraldehyde-3-phosphate dehydrogenase (GAPDH). Palinurus versicolor (PV) GAPDH complexed with ADP-ribose and SNAD has been crystallized by the method of sitting-drop vapor diffusion. X-ray diffraction data analysis reveals that both crystals belong to the same space group (C2), and have similar cell dimensions: a =152.80 A, b =100.35 A, c =128.31 A, β=110.28° and a =153.41 A, b =100.51 A, c =128.44 A, β =110.48°, respectively. It is estimated that the asymmetric unit in each crystal contains 4 subunits. This is a novel crystal form which is quite different from that previously reported for holo- and apo-GAPDH from the same spurce. The result suggests that the binding of the two coenzyme analogs to GAPDH may lead to some significant conformational changes, which are different from those induced by the coenzyme binding. The self-rotation function indicates that the tetramer of these two GAPDH

关键词： D-glyceraldehyde-3-phosphate dehydrogenase ADP-ribose SNAD crystal growth X-ray analysis.

基于最小生成树的图论分析评估原发性全面性癫痫患者的静息态脑网络拓扑改变

在线全文

学校读者我要写书评

暂无评论

中华放射学杂志 2025年第2期59卷 192-198页

作者：刘高平杨瑞佳李欣翟梦寒王昭杰张志强卢光明王正阁张冰南京大学医学院附属鼓楼医院医学影像科南京210008 南京大学医学院附属金陵医院放射诊断科南京210002

目的:基于最小生成树(MST)的图论分析方法评估原发性全面强直-阵挛癫痫(IGE-GTCS)患者静息态大脑网络的拓扑改变,并进一步分析IGE-GTCS患者的抗癫痫药物反应和MST拓扑特征以及病程之间的关系。方法:该研究为横断面研究。回顾性收集2013... 详细信息

目的:基于最小生成树(MST)的图论分析方法评估原发性全面强直-阵挛癫痫(IGE-GTCS)患者静息态大脑网络的拓扑改变,并进一步分析IGE-GTCS患者的抗癫痫药物反应和MST拓扑特征以及病程之间的关系。方法:该研究为横断面研究。回顾性收集2013年1月至2020年12月在南京大学医学院附属鼓楼医院接受头颅MRI检查的75例IGE-GTCS患者(IGE-GTCS组)和37名正常对照(对照组)。根据抗癫痫药物反应将IGE-GTCS患者分为药物控制良好(WC)亚组55例以及耐药(DR)亚组20例。首先计算被试全脑116个区域间的时间序列相关性以构建功能连接矩阵,对于每一个功能连接矩阵,采用Kruskal算法构建MST,并计算每一个MST的拓扑指标,包括叶分数、树层次和直径。2组间MST拓扑指标比较采用两样本t检验。WC亚组与DR亚组病程与MST指标间的相关性分析采用Pearson相关性检验。结果:相较于对照组,IGE-GTCS组的MST叶分数增加(t=2.27,P=0.025),直径减低(t=-2.24,P=0.027);对照组与IGE-GTCS组树层次差异无统计学意义(t=0.98,P=0.328)。WC亚组的MST叶分数(t=-2.39,P=0.019)和树层次(t=-2.52,P=0.014)较DR亚组显著减低,而WC亚组与DR亚组直径差异无统计学意义(P=0.093)。相关分析显示WC亚组中的MST直径与病程呈正相关(r=0.452,P<0.001),而DR组的MST直径与病程无显著相关性(r=-0.062,P=0.847)。结论:IGE-GTCS患者存在特异的全局脑网络拓扑改变,其大脑网络集中,效率增加;有效的抗癫痫药物治疗与脑网络异常的恢复有关。

关键词：癫痫全身性磁共振成像图论最小生成树

1T@2H-MoSe2 nanosheets directly arrayed on Ti plate： An efficient electrocatalytic electrode for hydrogen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Nano Research 2018年第9期11卷 4587-4598页

作者： Jingtong Zhang Yalan Chen Ming Liu Kun Du Yan Zhou Yanpeng Li zhaojie wang Jun Zhang State Key Laboratory of Heavy Oil Processing China University of Petroleum (East China) Qingdao 266580 China College of Science China University of Petroleum (East China) Qingdao 266580 China

Few-layered MoSe2 nanosheets with mixed 1T/2H phase were successfully arrayed on a Ti substrate （forming 1T@2H-MoSe2/Ti） through a facile one-step solvothermal process. After testing different synthesis conditions, it was found that the optimal process involves a temperature of 200℃ and a reaction time of 12 h. Structural characterizations reveal that the morphology of 1T@2H-MoSe2 consists of edge- terminated nanosheets with one to five layers, composed of a mixed 1T/2H phase dominated by the 1T one. The 1T@2H-MoSe2/Ti electrode shows excellent HER catalytic activity, with a small onset potential （-120 mV vs. reversible hydrogen electrode, RHE） and an electrode potential of only -133 mV （vs. RHE） to achieve a current density of 20 mA·cm^-2. This excellent electrocatalytic activity is due to the synergistic effects of 1T metallic phase, few-layered nanosheet morphology, and direct growth of 1T@2H-MoSe2 on the Ti substrate. In addition, the 1T@2H-MoSe2/Ti electrode shows excellent stability towards long-term electrolysis. This is due to the long-term stability of the valence states of Mo and Se, as shown by post-electrolysis X-ray photoelectron spectroscopy analysis.

关键词： nanosheets electrocatalyst Ti plate hydrogen evolution

Selectivity switching between CO and formate for CO_(2) reduction on Sb modified amorphous ZnO by electronic effect

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 Research 2023年第10期16卷 12144-12152页

作者： Hongyu Chen Shoufu Cao Lu wang Xiaojing Lin Qiuying Zhu Yizhu Shang Shuxian Wei Siyuan Liu zhaojie wang Baojun Wei Xiaoqing Lu College of Science China University of PetroleumQingdao 266580China School of Materials Science and Engineering China University of PetroleumQingdao 266580China

The adjustable intermediate binding capacity in electrocatalytic carbon dioxide(CO_(2))reduction is critical for varying the reaction pathways to desired ***,we first report the synthesis of boron-doped amorphous zinc oxide with(B-a-ZnO-Sb)or without antimony nanoparticles embedding(B-a-ZnO)via one-step wet chemical method,which is easy to scale up by enlarging the vessel and increasing *** successfully realizes the product switching from CO on B-a-ZnO to formate on *** experimental and theoretical results reveal that Sb weakens the charge interaction on Zn *** on the moderate adsorption of*COOH and strong adsorption of*OCHO and*HCOOH for B-a-ZnO,the foreign Sb weakens the adsorption of these intermediates and brings about a favor formate production instead of *** work points out a new direction for the synthesis of amorphous ZnO-based catalysts and provides advanced insights into the aimed selectivity switch for CO_(2)reduction by electronic effect.

关键词： carbon dioxide reduction amorphous ZnO electronic effect selectivity switching

Ion elemental-optimized layered double hydroxide nanoparticles promote chondrogenic differentiation and intervertebral disc regeneration of mesenchymal stem cells through focal adhesion signaling pathway

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bioactive Materials 2023年第4期22卷 75-90页

作者： zhaojie wang Huiyi Yang Xu Xu Hongxing Hu Yuxin Bai Jian Hai Liming Cheng Rongrong Zhu Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration of Ministry of Education Department of OrthopedicsTongji Hospital Affiliated to Tongji UniversitySchool of Life Science and TechnologyTongji UniversityShanghai200065China Frontier Science Center for Stem Cell Research Tongji UniversityShanghai200065China

Chronic low back pain and dyskinesia caused by intervertebral disc degeneration(IDD)are seriously aggravated and become more prevalent with *** clinical treatments do not restore the biological structure and inherent function of the *** emergence of tissue engineering and regenerative medicine has provided new insights into the treatment of *** synthesized biocompatible layered double hydroxide(LDH)nanoparticles and optimized their ion elemental compositions to promote chondrogenic differentiation of human umbilical cord mesenchymal stem cells(hUC-MSCs).The chondrogenic differentiation of LDH-treated MSCs was validated using Alcian blue staining,qPCR,and immunofluorescence ***-pretreated hUC-MSCs were differentiated prior to transplantation into the degenerative site of a needle puncture IDD rat *** and regeneration evaluated using X-ray,magnetic resonance imaging,and tissue immunostaining 4-12 weeks after transplantation showed recovery of the disc space height and integrated tissue *** sequencing revealed significant regulatory roles of the extracellular matrix(ECM)and integrin receptors of focal adhesion signaling pathway in enhancing chondrogenic differentiation and thus prompting tissue *** construction of ion-specific LDH nanomaterials for in situ intervertebral disc regeneration through the focal adhesion signaling pathway provides theoretical basis for clinical transformation in IDD treatment.

关键词： Mesenchymal stem cells Layered double hydroxide Chondrogenic differentiation Intervertebral disc degeneration Focal adhesion signaling pathway

How can the Dual-atom Catalyst FeCo-NC Surpass Singleatom Catalysts Fe-NC/Co-NC in CO_(2) RR?-CO Intermediate Assisted Promotion via a Synergistic Effect

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 & Environmental Materials 2023年第1期6卷 300-308页

作者： Shoufu Cao Sainan Zhou Hongyu Chen Shuxian Wei Siyuan Liu Xiaojing Lin Xiaodong Chen zhaojie wang Wenyue Guo Xiaoqing Lu School of Materials Science and Engineering China University of PetroleumQingdao Shandong 266580China College of Science China University of PetroleumQingdao Shandong 266580China

Atomically dispersed catalysts are widely adopted in CO_(2)reduction reaction(CO_(2)RR)due to maximal atomic utilization and high catalytic ***-atom catalysts(DACs),with more dispersed active sites and distinct electronic structures compared with single-atom catalysts(SACs),may exhibit diverse catalytic ***,the DAC FeCo-NC and SAC Fe-NC/Co-NC are employed as probes to explore DACs advantage in CO_(2)*** show that the moderate interaction between the dual-atom center and N coordination balances structural stability and catalytic *** is the only product on Fe-NC/Co-NC,and the high limiting potentials from−1.22 to−1.67 V inhibit further ***-NC assisted with CO intermediate exhibits low limiting potentials of−0.64 V for both CH_(3)OH and CH 4,comparable to those on Cu-based *** circumstance of applied potentials,CO_(2)RR on FeCo-NC has greater advantages in yielding CH_(3)OH and CH 4 than that on Fe-NC/Co-NC,and hydrogen evolution reaction is severely *** intrinsic essence is that dual-atom center can provide large spin-polarization and multi-electron transfer capability,rendering CO intermediates as effective electronic and geometric modifiers in CO_(2)*** work highlights FeCo-NC as a high-performance CO_(2)RR catalyst toward deep-reduction C1 products and elucidates CO intermediate assisted promotion mechanism via a dual-atom synergistic effect.

关键词： dispersed limiting rendering