期刊文献+
共找到6篇文章
< 1 >
每页显示 20 50 100
Nanostructured Graphitic Carbon Nitride for Photocatalytic and Electrochemical Applications
1
作者 Muhammad Abdul Qadeer Iqra Fareed +6 位作者 Asif Hussain Muhammad Asim Farid Sadia Nazir Faheem K.Butt Ji-Jun Zou Muhammad Tahir Shang-Feng Du 《电化学(中英文)》 北大核心 2025年第1期1-30,共30页
Graphitic carbon nitride(g-C_(3)N_(4))exhibits great mechanical as well as thermal characteristics,making it a valuable ma-terial for use in photoelectric conversion devices,an accelerator for synthesis of organic com... Graphitic carbon nitride(g-C_(3)N_(4))exhibits great mechanical as well as thermal characteristics,making it a valuable ma-terial for use in photoelectric conversion devices,an accelerator for synthesis of organic compounds,an electrolyte for fuel cell applications or power sources,and a hydrogen storage substance and a fluorescence detector.It is fabricated using dif-ferent methods,and there is a variety of morphologies and nanostructures such as zero to three dimensions that have been designed for different purposes.Ther e are many reports about g-C_(3)N_(4) in recent years,but a comprehensive review which covers nanostructure dimensions and their properties are missing.This review paper aims to give basic and comprehensive understanding of the photocatalytic and electrocatalytic usages of g-C_(3)N_(4).It highlights the recent progress of g-C_(3)N_(4) nano-structure designing by covering synthesis methods,dimensions,morphologies,applications and properties.Along with the summary,we will also discuss the challenges and prospects.Scientists,investigators,and engineers looking at g-C_(3)N_(4) nanostructures for a variety of applications might find our review paper to be a useful resource. 展开更多
关键词 Graphitic carbon nitride HER OER Fuel cell Sustainable energy ELECTROCATALYST
在线阅读 下载PDF
Recent Advances in Non-Enzymatic Electrochemical Sensors for Theophylline Detection
2
作者 Ernis Gustria Putri Yulia M T A +5 位作者 Syauqi Muhammad Iqbal Jiwanti Prastika Krisma Hartati Yeni Wahyuni Kondo Takeshi Anjani Qonita Kurnia Gunlazuardi Jarnuzi 《电化学(中英文)》 北大核心 2025年第3期1-24,共24页
Detection of target analytes at low concentrations is significant in various fields,including pharmaceuticals,healthcare,and environmental protection.Theophylline(TP),a natural alkaloid used as a bronchodilator to tre... Detection of target analytes at low concentrations is significant in various fields,including pharmaceuticals,healthcare,and environmental protection.Theophylline(TP),a natural alkaloid used as a bronchodilator to treat respiratory disorders such as asthma,bronchitis,and emphysema,has a narrow therapeutic window with a safe plasma concentration ranging from 55.5-111.0μmol·L^(-1)in adults.Accurate monitoring of TP levels is essential because too low or too high can cause se-rious side effects.In this regard,non-enzymatic electrochemical sensors offer a practical solution with rapidity,portability,and high sensitivity.This article aims to provide a comprehensive review of the recent developments of non-enzymatic electrochemical sensors for TP detection,highlighting the basic principles,electro-oxidation mechanisms,catalytic effects,and the role of modifying materials on electrode performance.Carbon-based electrodes such as glassy carbon electrodes(GCEs),carbon paste electrodes(CPEs),and carbon screen-printed electrodes(SPCEs)have become the primary choices for non-enzymatic sensors due to their chemical stability,low cost,and flexibility in modification.This article identifies the sig-nificant contribution of various modifying materials,including nanomaterials such as carbon nanotubes(CNTs),graphene,metal oxides,and multi-element nanocomposites.These modifications enhance sensors’electron transfer,sensitivity,and selectivity in detecting TP at low concentrations in complex media such as blood plasma and pharmaceutical samples.The electro-oxidation mechanism of TP is also discussed in depth,emphasizing the hydroxyl and carbonyl reaction pathways strongly influenced by pH and electrode materials.These mechanisms guide the selection of the appropriate electrode ma-terial for a particular application.The main contribution of this article is to identify superior modifying materials that can improve the performance of non-enzymatic electrochemical sensors.In a recent study,the combination of multi-element nanocomposites based on titanium dioxide(TiO_(2)),CNTs,and gold nanoparticles(AuNPs)resulted in the lowest detection limit of 3×10^(-5)μmol·L^(-1),reflecting the great potential of these materials for developing high-performance electrochemical sensors.The main conclusion of this article is the importance of a multidisciplinary approach in electrode material design to support the sensitivity and selectivity of TP detection.In addition,there is still a research gap in understanding TP’s more detailed oxidation mechanism,especially under pH variations and complex environments.Therefore,further research on electrode modification and analysis of the TP oxidation mechanism are urgently needed to improve the accuracy and sta-bility of the sensor while expanding its applications in pharmaceutical monitoring and medical diagnostics.By integrating various innovative materials and technical approaches,this review is expected to be an essential reference for developing efficient and affordable non-enzymatic electrochemical sensors. 展开更多
关键词 Theophylline detection Non-enzymatic sensors Electrochemical sensors Modifier electrode Reaction mechanism
在线阅读 下载PDF
Boehmeria nivea var. strigosa (Urticaceae), a new variety from Southwest China 被引量:1
3
作者 ZHAO Ying Richard I.MILNE +2 位作者 LI Zhipeng Amos KIPKOECH WU Zengyuan 《广西植物》 CAS CSCD 北大核心 2024年第9期1617-1624,I0001-I0006,共14页
Boehmeria nivea var.strigosa Zeng Y.Wu&Y.Zhao,a new variety of B.nivea(Urticaceae)from Southwest China,is here described based on evidence from morphology and molecular phylogeny.This new variety is mainly charact... Boehmeria nivea var.strigosa Zeng Y.Wu&Y.Zhao,a new variety of B.nivea(Urticaceae)from Southwest China,is here described based on evidence from morphology and molecular phylogeny.This new variety is mainly characterized by its green abaxial leaf blade,partly connate stipules,and densely patent strigose hairs on stems and potioles.The phylogenetic analysis based on rbc L,nrDNA and rbc L+nrDNA datasets,revealed that all individuals of B.nivea var.strigosa formed a monophyletic group.The conservation status of B.nivea var.strigosa is assessed as“Near Threatened”(NT)according to IUCN evaluation criteria.The discovery of this new variety is not only crucial for the taxonomy of ramie,but also provides reference for the exploration and utilization of ramie. 展开更多
关键词 Boehmeria nivea MORPHOLOGY molecular phylogeny new variety Southwest China YUNNAN
在线阅读 下载PDF
Effects of pooling,specialization,and discretionary task completion on queueing performance
4
作者 JIANG Houyuan 《运筹学学报(中英文)》 CSCD 北大核心 2024年第3期81-96,共16页
Pooling,unpooling/specialization,and discretionary task completion are typical operational strategies in queueing systems that arise in healthcare,call centers,and online sales.These strategies may have advantages and... Pooling,unpooling/specialization,and discretionary task completion are typical operational strategies in queueing systems that arise in healthcare,call centers,and online sales.These strategies may have advantages and disadvantages in different operational environments.This paper uses the M/M/1 and M/M/2 queues to study the impact of pooling,specialization,and discretionary task completion on the average queue length.Closed-form solutions for the average M/M/2 queue length are derived.Computational examples illustrate how the average queue length changes with the strength of pooling,specialization,and discretionary task completion.Finally,several conjectures are made in the paper. 展开更多
关键词 queuing systems pooling SPECIALIZATION discretionary task completion average queue length
在线阅读 下载PDF
尼亚加拉大瀑布
5
作者 狄更斯 张谷若 《绿色中国(公众版)》 2004年第11M期76-76,共1页
那一天的天气寒冷潮湿,着实苦人;凄雾浓重,几欲成滴,树木在这个北国里还都枝柯赤裸,完全冬意.
关键词 《尼亚加拉大瀑布》 英国 查尔斯·狄更斯 批判现实主义作家 游记
在线阅读 下载PDF
Reviewing System Strength Metrics in IBR-Dominated Power Systems:Definitions,Principles,and Classifications
6
作者 ZHU Yue QIU Zitian +2 位作者 HADJILEONIDAS Andreas GU Yunjie GREEN Tim 《南方电网技术》 2025年第7期72-89,共18页
Along with the growing integration of renewable energy resources,the new power systems,which are dominated by inverter-based resources(IBRs),are facing critical challenges in both planning and operation stages.The con... Along with the growing integration of renewable energy resources,the new power systems,which are dominated by inverter-based resources(IBRs),are facing critical challenges in both planning and operation stages.The conventionally used system strength metric,short-circuit ratio(SCR),exhibits limitations in assessing connections of new IBRs due to their unique dynamic behaviour and control interactions.In this paper,the definition of system strength is reviewed.The underlying principles of conventional SCR and its variants are then discussed,with their constraints explained.To describe the system strength in a more comprehensive way,this paper further classifies system strength into three categories:quasi-static,small-signal,and large-signal.For each category,relevant metrics are introduced and their relative merits are discussed.Electromagnetic transient simulations are presented to illustrate key insights. 展开更多
关键词 system strength short-circuit ratio inverter-based resource quasi-static system strength small-signal system strength large-signal system strength
在线阅读 下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部