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Minimum and Maximum Resistance Status of Unicyclic Graphs

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Journal of Mathematical Research with Applications 2022年第5期42卷 463-475页

作者： Meiqun CHENG bo zhou School of Mathematical Sciences South China Normal University

The resistance status of a vertex of a connected graph is the sum of the resistance distance between this vertex and any other vertices of the graph. The minimum(maximum,resp.) resistance status of a connected graph is the minimum(maximum, resp.) resistance status of all vertices of the graph. In this paper, we determine the extremal values and corresponding extremal graphs for the minimum(maximum, resp.) resistance status over all unicyclic graphs of fixed order, and we also discuss the dependence of the minimum(maximum, resp.) resistance status on the girth of unicyclic graphs.

关键词： minimum resistance status maximum resistance status resistance distance unicyclic graph extremal graph

Developments and challenges in neoadjuvant therapy for locally advanced pancreatic cancer

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World Journal of Gastroenterology 2023年第35期29卷 5094-5103页

作者： bo zhou Shi-Ran Zhang Geng Chen Ping Chen Department of Hepatobiliary Surgery Daping HospitalArmy Medical UniversityChongqing 400042China

Pancreatic ductal adenocarcinoma(PDAC)remains a significant public health challenge and is currently the fourth leading cause of cancer-related mortality in developed *** advances in cancer treatment,the 5-year survival rate for patients with PDAC remains less than 5%.In recent years,neoadjuvant therapy(NAT)has emerged as a promising treatment option for many cancer types,including locally advanced PDAC,with the potential to improve patient *** analyze the role of NAT in the setting of locally advanced PDAC over the past decade,a systematic literature search was conducted using PubMed and Web of *** results suggest that NAT may reduce the local mass size,promote tumor downstaging,and increase the likelihood of *** findings are supported by the latest evidence-based medical literature and the clinical experience of our *** the potential benefits of NAT,there are still challenges that need to be *** such challenge is the lack of consensus on the optimal timing and duration of *** criteria for patient selection are needed to further identify PDAC patients likely to respond to *** conclusion,NAT has emerged as a promising treatment option for locally advanced ***,further research is needed to optimize its use and to better understand the role of NAT in the management of this challenging *** continued advances in cancer treatment,there is hope of improving the outcomes of patients with PDAC in the future.

关键词： Neoadjuvant therapy Pancreatic ductal adenocarcinoma Locally advanced pancreatic cancer Chemoradiotherapy Immunotherapy Vaccine therapy

Wetting behaviors of methanol,ethanol,and propanol on hydroxylated SiO2 substrate

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Nuclear Science and Techniques 2018年第2期29卷 26-31页

作者： Xue-Chuan Nie bo zhou Chun-Lei Wang Hai-Ping Fang Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China School of Electronic Engineering Chengdu Technological UniversityChengdu 611730China

Water molecules could form a liquid droplet on the water monolayer on a specific solid surface, which has been referred to as ‘‘ordered water monolayer that does not completely wet water'' at room temperature. In contrast to the water molecules, the family of alcohol molecules has the same OH polar head and various lengths of their hydrophobic nonpolar tail; the length of the hydrophobic tail can affect the hydrophobic effect. In this study, using molecular dynamics simulations, we investigated the wetting behaviors of methanol, ethanol, and propanol molecules adsorbed on a SiO_2 surface. The results showed that the methanol, ethanol, and propanol molecules could form an ordered monolayer on the SiO_2 surface and a droplet on top of this monolayer, with different contact angles. The differences in the contact angles were attributed to the differences in the interactions between the alcohol monolayer and droplet.

关键词： Wetting behavior Alcohol SiO2 Molecular dynamics simulation

Two-dimensional metallic CoTe_(2)flakes for electrocatalytic hydrogen evolution

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Rare Metals 2024年第11期43卷 5860-5867页

作者： Yu-Qing Zhao Qian Liu bo-Jian zhou Guang Yang Shao-Long Jiang School of Physics and Electronics Science Hunan University of Science and TechnologyXiangtan 411201China College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210China Department of Physics Southern University of Science and TechnologyShenzhen 518055China School of Integrated Circuit Science and Engineering Beihang UniversityBeijing 100191China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong) Shenzhen 518045China

Two-dimensional(2D)metallic 1T-CoTe_(2)has attracted considerable attention due to its fascinating physical properties and promising applications in electronics and ***,the production of highquality 2D 1T-CoTe_(2)still remains ***,we demonstrate a methodology to realize the facile synthesis of ultrathin,high-quality CoTe_(2)flakes with a thickness down to 2.3 nm on mica substrates by an ambient-pressure chemical vapor deposition(CVD)*** atomic arrangement is verified by scanning transmission electron *** theoretical calculations uncover the metallic characteristic of 1T-CoTe_(2)in the 2D ***,the CVD-derived 2D metallic CoTe_(2)flakes for the hydrogen evolution reaction(HER)catalyst exhibit admirable performance,such as an overpotential of186 mV at 10 mA·cm^(-2),a Tafel slope of 78 mV·dec^(-1),an exchange current density of 69μA·cm^(-2),and negligible performance degradation after 1000 *** results establish novel approaches for the synthesis and HER application of 2D metallic 1T-CoTe_(2).

关键词： 2D metallic material 1T-CoTe_(2) Chemical vapor deposition Electrochemical hydrogen evolution

Age-dependent expression of forkhead box O proteins in the duodenum of rats

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第9期12卷 730-735页

作者： Pan HUANG Zhen-qi zhou Rui-hua HUANG bo zhou Quan-wei WEI Fang-xiong SHI College of Animal Science and Technology Nanjing Agricultural UniversityNanjing 210095China

The O subfamily of forkhead box(FoxO) proteins is the downstream effector of the insulin-like growth factor-1/phosphoinositide 3-kinase/protein kinase B(IGF-1/PI3K/PKB) signal *** objective of the present study was to examine the expressions of three members of FoxO proteins,FoxO1,FoxO3a,and FoxO4 in the duodenum of Sprague-Dawley rats at different *** result demonstrated that the expression of FoxO4 in rat duodenum showed an age-dependent *** Day 21,there were no detectable localization and expression of FoxO4 in the duodenum,while,at Months 2 and 6,localization and expression of FoxO4 were *** addition,FoxO4 staining was primarily concentrated in the cell nuclei of the lamina propria around the intestinal gland of the duodenum in 2-month-old rats,but was not detectable in the same area in 6-month-old *** results showed also that although FoxO3a existed in the cytoplasm of the lamina propria at a low level at the 2-and 6-month marks,it was still not detectable at Day ***,FoxO1 was not detectable in all parts and *** together,our findings suggested that the cell-specific and age-dependent expressional patterns of FoxO4 and FoxO3a proteins in the duodenum play some roles in the development and growth performance of the rat duodenum.

关键词： O subfamily of forkhead box(FoxO) Age-dependence Duodenum Rat

An option for green and sustainable future: Electrochemical conversion of ammonia into nitrogen

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Journal of Energy Chemistry 2021年第9期30卷 384-402页

作者： bo zhou Nana Zhang Yujie Wu Weijun Yang Yanbing Lu Yanyong Wang Shuangyin Wang State Key Laboratory of Chem/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082HunanChina

Green and sustainable options are needed to ease the current energy and environmental crisis, and alleviate the greenhouse effect and energy shortage. As an alternative carbon–neutral synthetic fuel, ammonia shows great potential due to its high energy density, non-toxic by-products, and mature related infrastructures. However, related practical applications have been severely hampered on ammoniaoxidation due to the high cost of catalysts and immature energy utilization systems. Here, we comprehensively summarized the efforts which have been made in recent years with the aim of providing a deep sight into the development and deficiencies in this territory and trying to establish a simple framework of basic knowledge for researchers. The exploration of mechanism is discussed first and then the relevant catalysts studied in recent years are summarized. Besides, the progress of direct ammonia fuel cells(DAFCs) is also presented and the challenges as well as perspectives on future developments of electrocatalysts for ammonia electro-oxidation and its practical application are provided at the end.

关键词： Ammonia Ammonia electro-oxidation reaction(AOR) Mechanism Electrocatalysts DAFCs

Engineering electronic structures of titanium vacancies in Ti_(1-x)O_(2)nanosheets enables enhanced Li-ion and Na-ion storage

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Green Energy & Environment 2022年第4期7卷 734-741页

作者： Huiqin Wang Fengchu Zhang Jing Xia Fei Lu bo zhou Ding Yi Xi Wang Key Laboratory of Luminescence and Optical Information Ministry of EducationDepartment of PhysicsSchool of ScienceBeijing Jiaotong UniversityBeijing100044China Institute of Molecular Plus Tianjin UniversityTianjin300072China Chemistry and Chemical Engineering Guangdong Laboratory Shantou515031China

Up to now,three kinds of ion-storage mechanisms are summarized towards anode materials in lithium/sodium-ion batteries,but they have low capacity and poor cyclic ***,it is necessary to develop a new approach to optimize ion ***,we report an adsorption/desorption storage route through engineering electronic structure of cation-deficient Ti_(1-x)O_(2)***_(1-x)O_(2)nanosheets indeed exhibit higher capacity(332.1 mA h g^(-1)vs.137.7 mA h g^(-1)for LIBs,195.7 mA h g^(-1)vs.111 mA h g^(-1)for SIBs),and more stable cyclic performance(296 mA h g^(-1)vs.99 mA h g^(-1)for LIBs,178.1 mA h g^(-1)vs.80.2 mA h g^(-1)for SIBs after 100 cycles)at 0.1 A g^(-1)than TiO_(2)*** analysis and density functional theory(DFT)calculations reveal that electronic structures of vacancy within Ti_(1-x)O_(2) nanosheets encourage a novel adsorption-desorption storage *** results highlight the benefits of the engineered electronic structures within electrode material and implement novel ion-storage mechanism towards broad energy storage applications.

关键词： Titanium vacancy Titania nanosheet Electronic structure Ion storage Storage mechanism

Understanding the surface segregation behavior of bimetallic CoCu toward HMF oxidation reaction

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Journal of Energy Chemistry 2022年第11期31卷 85-90,I0004页

作者： Yanwei Zhu Jianqiao Shi Yingying Li Yuxuan Lu bo zhou Shuangyin Wang Yuqin Zou State Key Laboratory of Chem/Bio-Sensing and Chemometrics Advanced Catalytic Engineering Research Center of the Ministry of EducationCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082HunanChina School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000HunanChina

Surface segregation is ubiquitous in multi-component materials and is of great important for catalysis but little is known on the surface structure under graphene ***,we show that the graphene encapsulated CoCu performs well for the electrocatalytic oxidation of 5-hydroxymethylfurfural(HMF)to2,5-furandicarboxylic acid(FDCA)with the onset potential before 1.23 VRHEand a nearly 100%selectivity of FDCA under 1.4 *** the experimental results,the unprecedented catalytic performance was attributed to local structural distortion and sub-nanometer lattice composition of the CoCu *** accurately show the dispersed Cu doped Co_(3)O_(4) nano-islands with a lot of edge sites on the bimetallic Co-Cu ***,the gradient components effectively facilitate the establishment of built-in electric field and accelerate the charge *** and experimental results reveal that the surface Co and neighbouring Cu atoms in sub-nanometer lattice synergistically promote the catalysis of *** work offers new insights into surface segregation in tuning the element spatial distribution for catalysis.

关键词： CoCu alloy Surface segregation Sub-nanometer lattice Electrocatalysis HMF oxidation

Enhancing upconversion of Nd3+ through Yb^(3+)-mediated energy cycling towards temperature sensing

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Journal of Rare Earths 2021年第12期39卷 1506-1511,I0002页

作者： Nan Song Songbin Liu Peng Zhang Junshan He Qinyuan Zhang Feng Wang bo zhou State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesSouth China University of TechnologyGuangzhou 510641China Department of Materials Science and Engineering City University of Hong KongHong Kong SARChina

Photon upconversion of lanthanides has been a powerful means to convert low-energy photons into high-energy ***,in contrast to the mostly investigated lanthanide ions,it has remained a challenge for the efficient upconversion of Nd^(3+)due to the deleterious concentration quenching *** we report an efficient strategy to enhance the upconversion of Nd^(3+)through the Yb^(3+)-mediated energy cycling in a core-shell-shell *** Nd^(3+)and Yb^(3+)are confined in the interlayer,and the presence of Yb^(3+)in the Nd-sublattice provides a more matched energy for the upconversion transitions occurring at the intermediate state of Nd^(3+)towards much better population at its emissive ***,this design also minimizes the possible cross-relaxation processes at both intermediate level and the emissive levels of Nd^(3+)which are the primary factors limiting the upconversion performance for the Nd^(3+)-doped *** energy cycling-enhanced upconversion shows promise in temperature sensing.

关键词： Upconversion Nd^(3+) Energy cycling Core-shell nanostructure Temperature sensing Rare earths