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Covalent carbene modification of 2D black phosphorus

chinese Chemical Letters 2022年第10期33卷 4640-4644页

作者： Lei Zhang Zhe-Ji Wang Bo Ma Xiang-Yang Li yu-chi dai Guowen Hu Yong Peng Qiang Wang Hao-Li Zhang State Key Laboratory of Applied Organic Chemistry(SKLAOC) Key Laboratory of Special Function Materials and Structure Design(MOE)College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China Office of Laboratory and Equipment Management Lanzhou UniversityLanzhou 73000China Key Laboratory of Magnetism and Magnetic Materials of Ministry of Education School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistryCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin 300072China

Black phosphorus(BP)has attracted an ever-growing interest due to its unique anisotropic two-dimensional structure,impressive photoelectronic properties and attractive application ***,the tools for bandgap engineering and passivation via covalent modification of BP nanosheets remain limited to diazonium salt and nucleophilic addition methods,so that developing new modification strategies for BP nanosheets is crucial to explore its physical and chemical properties and enrich the toolbox for ***,we report the covalent modification of liquid-phase exfoliated BP nanosheets based on a rational analysis of BP *** modification of BP is achieved via carbene,a highly reactive organic *** carbene modification improves the solubility and stability of BP *** microscopic and spectroscopic characterizations including infrared spectra,Raman spectra,X-ray photoelectron spectra,SEM and TEM were conducted to provide insights for the *** proof of the existence of covalent bonds between BP nanosheets and organic moieties confirms the successful ***,theoretical calculations were conducted to unveil the reaction mechanism of the two different types of bonds and the chemical property of two-dimensional BP.

关键词： Two-dimensional materials Black phosphorus Covalent functionalization Carbene Solubility

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C-X-C chemokine receptor type 5+CD8+T cells as immune regulators in hepatitis Be antigen-positive chronic hepatitis B under interferonalpha treatment

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World Journal of Gastroenterology 2025年第3期31卷 73-83页

作者： Zhen-yu Xu Zhong-Shang dai Guo-Zhong Gong Min Zhang Department of Infectious Diseases Second Xiangya HospitalCentral South UniversityChangsha 410011Hunan ProvinceChina Institute of Hepatology and Department of Infectious Diseases The Second Xiangya HospitalCentral South UniversityChangsha 410011Hunan ProvinceChina

BACKGROUND C-X-C chemokine receptor type 5(CXCR5)+CD8+T cells represent a unique immune subset with dual roles,functioning as cytotoxic cells in persistent viral infections while promoting B cell *** their importance,the specific role of CXCR5+CD8+T cells in chronic hepatitis B(CHB),particularly during interferon-alpha(IFN-α)treatment,is not fully *** study aims to elucidate the relationship between CXCR5+CD8+T cells and sustained serologic response(SR)in patients undergoing 48 weeks of pegylated IFN-α(peg-IFN-α)treatment for *** To elucidate the relationship between CXCR5+CD8+T cells and sustained SR in patients undergoing 48 weeks of peg-IFN-αtreatment for *** This study enrolled 60 patients with hepatitis Be antigen(HBeAg)-positive CHB undergoing 48 weeks of peg-IFN-α*** were assessed for eligibility based on criteria such as persistent HBsAg-positive status for at least six months,HBeAb-negative,hepatitis B virus DNA levels exceeding 2×104 copies/mL,and alanine aminotransferase(ALT)levels between 2 and 10 times the upper limit of *** samples were collected at baseline and at weeks 12,24,48,and a 24-week treatment-free follow-up(week 72)to measure serum interleukin(IL)-21 concentration via ELISA and to analyze CXCR5 and programmed death-ligand 1(PD-L1)expression on CD8+T cells by flow cytometry,CXCR5 is a chemokine receptor that directs immune cells to specific tissues,while PD-L1 is a protein that regulates immune responses by inhibiting T cell *** Patients with CHB exhibited significantly lower levels of circulating CXCR5+CD8+T cells compared to healthy controls(Pchieved sustained SR compared to non-SR(NSR).A significant correlation was observed between CXCR5 and PD-L1 expression(r=-0.189,P=0.002).However,there was no significant correlation between serum IL-21 levels and CXCR5+CD8+lymphocytes(r=-0.03,P=0.62

关键词： C-X-C chemokine receptor type 5 Programmed death-ligand 1 Interleukin-21 Pegylated interferon-alpha Chronic hepatitis B

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Research status and prospects of the fractal analysis of metal material surfaces and interfaces

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 20-38页

作者： Qinjin dai Xuefeng Liu Xin Ma Shaojie Tian Qinghe Cui Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China Laboratory for Advanced Materials Processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Mechanical and Electrical Engineering Xinjiang Institute of EngineeringUrumqi 830023China

As a mathematical analysis method,fractal analysis can be used to quantitatively describe irregular shapes with self-similar or self-affine *** analysis has been used to characterize the shapes of metal materials at various scales and *** methods make it difficult to quantitatively describe the relationship between the regular characteristics and properties of metal material surfaces and ***,fractal analysis can be used to quantitatively describe the shape characteristics of metal materials and to establish the quantitative relationships between the shape characteristics and various properties of metal *** the perspective of two-dimensional planes and three-dimensional curved surfaces,this paper reviews the current research status of the fractal analysis of metal precipitate interfaces,metal grain boundary interfaces,metal-deposited film surfaces,metal fracture surfaces,metal machined surfaces,and metal wear *** relationship between the fractal dimensions and properties of metal material surfaces and interfaces is *** from three perspectives of fractal analysis,namely,research scope,image acquisition methods,and calculation methods,this paper identifies the direction of research on fractal analysis of metal material surfaces and interfaces that need to be *** is believed that revealing the deep influence mechanism between the fractal dimensions and properties of metal material surfaces and interfaces will be the key research direction of the fractal analysis of metal materials in the future.

关键词： metal material surfaces and interfaces fractal analysis fractal dimension homogeneity

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面向抗震韧性评价的型钢混凝土柱易损性函数

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哈尔滨工业大学学报 2025年第1期57卷 24-34页

作者：李磊王菲菲代旷宇于晓辉西安建筑科技大学土木工程学院西安710055 西部绿色建筑国家重点实验室(西安建筑科技大学) 西安710055 郑州大学土木工程学院郑州450001 桂林理工大学土木与建筑工程学院广西桂林541004

为满足型钢混凝土(steel reinforced concrete,SRC)结构地震损失评估及抗震韧性评价的需求,建立SRC柱构件的地震易损性函数十分关键。本文首先基于文献调研,结合JGJ 138—2016《组合结构设计规范》,从国内外文献中筛选了227榀拟静力循... 详细信息

为满足型钢混凝土(steel reinforced concrete,SRC)结构地震损失评估及抗震韧性评价的需求,建立SRC柱构件的地震易损性函数十分关键。本文首先基于文献调研,结合JGJ 138—2016《组合结构设计规范》,从国内外文献中筛选了227榀拟静力循环加载的SRC柱,建立标准化的SRC柱试验数据库。其次,考虑失效模式的差异性,将构件分为延性SRC柱和偏脆性SRC柱,并给出了不同类别的构件损伤等级划分标准及对应的修复方法。然后,以位移角为工程需求参数,分别提取了各构件对应不同损伤等级的位移角限值,采用FEMA P-58方法,建立了不同类别的SRC柱在各损伤等级下的易损性函数。最后,给出了与GB/T 38591—2020《建筑抗震韧性评价标准》相容的易损性函数参数表,并分析了抗震等级和轴压比对SRC柱易损性函数参数及易损性曲线的影响。最终,通过分析一幢型钢混凝土框架结构办公楼的抗震韧性,说明了所提出的易损性函数在抗震韧性评价中的作用。

关键词：型钢混凝土柱试验数据库损伤状态易损性函数抗震韧性评价标准

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Near-infrared brain functional characteristics of mild cognitive impairment with sleep disorders

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World Journal of Psychiatry 2025年第1期15卷 106-116页

作者： Heng Liao Sha Liao yu-Jiao Gao Xi Wang Li-Hong Guo Su Zheng Wu Yang Yi-Nan dai Sleep Psychosomatic Medicine Center Taihe Hospital of Shiyan CityAffiliated Hospital of Hubei University of MedicineShiyan 442000Hubei ProvinceChina Department of Integrated chinese and Western Medicine Taihe Hospital of Shiyan CityAffiliated Hospital of Hubei University of MedicineShiyan 442000Hubei ProvinceChina Department of Orthopaedics Taihe Hospital of Shiyan CityAffiliated Hospital of Hubei University of MedicineShiyan 442000Hubei ProvinceChina Department of Rehabilitation Taihe Hospital of Shiyan CityAffiliated Hospital of Hubei University of MedicineShiyan 442000Hubei ProvinceChina

BACKGROUND Mild cognitive impairment(MCI)has a high risk of progression to Alzheimer’s *** disease is often accompanied by sleep disorders,and whether sleep disorders have an effect on brain function in patients with MCI is *** To explore the near-infrared brain function characteristics of MCI with sleep *** A total of 120 patients with MCI(MCI group)and 50 healthy subjects(control group)were *** subjects underwent the functional near-infrared spec-troscopy *** baseline data,Mini-Mental State Examination,Montreal Cognitive Assessment scale,fatigue severity scale(FSS)score,sleep parameter,and oxyhemoglobin(Oxy-Hb)concentration and peak time of functional near-infrared spectroscopy test during the task *** relationship between Oxy-RESULTS Compared with the control group,the FSS score of the MCI group was higher(t=11.310),and the scores of Pittsburgh sleep quality index,sleep time,sleep efficiency,nocturnal sleep disturbance,and daytime dysfunction were higher(Z=-10.518,-10.368,-9.035,-10.661,-10.088).Subjective sleep quality and total sleep time scores were lower(Z=-11.592,-9.924).The sleep efficiency of the MCI group was lower,and the awakening frequency,rem sleep latency period,total sleep time,and oxygen desaturation index were higher(t=5.969,5.829,2.887,3.003,5.937).The Oxy-Hb concentration at T0,T1,and T2 in the MCI group was lower(t=14.940,11.280,5.721),and the peak time was higher(t=18.800,13.350,9.827).In MCI patients,the concentration of Oxy-Hb during T0 was negatively correlated with the scores of Pittsburgh sleep quality index,sleep time,total sleep time,and sleep efficiency(r=-0.611,-0.388,-0.563,-0.356).It was positively correlated with sleep efficiency and total sleep time(r=0.754,0.650),and negatively correlated with oxygen desaturation index(r=-0.561)and FSS score(r=-0.526).All comparisons were P<*** Patients with MCI and sleep disorders have lower near-infrared brain function than norm

关键词： Mild Cognitive impairment Sleep disorders Near-infrared Brain functional Characteristics

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A multithreaded parallel upwind sweep algorithm for the S_(N) transport equations discretized with discontinuous finite elements

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Nuclear Science and Techniques 2023年第12期34卷 229-241页

作者： Zhi‑Wei Zong Mao‑Song Cheng Ying‑chi yu Zhi‑Min dai Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of chinese Academy of Sciences Beijing 100049China

The complex structure and strong heterogeneity of advanced nuclear reactor systems pose challenges for high-fidelity neutron-shielding calculations. Unstructured meshes exhibit strong geometric adaptability and can overcome the deficiencies of conventionally structured meshes in complex geometry modeling. A multithreaded parallel upwind sweep algorithm for S_(N) transport was proposed to achieve a more accurate geometric description and improve the computational efficiency. The spatial variables were discretized using the standard discontinuous Galerkin finite-element method. The angular flux transmission between neighboring meshes was handled using an upwind scheme. In addition, a combination of a mesh transport sweep and angular iterations was realized using a multithreaded parallel technique. The algorithm was implemented in the 2D/3D S_(N) transport code ThorSNIPE, and numerical evaluations were conducted using three typical benchmark problems:IAEA, Kobayashi-3i, and VENUS-3. These numerical results indicate that the multithreaded parallel upwind sweep algorithm can achieve high computational efficiency. ThorSNIPE, with a multithreaded parallel upwind sweep algorithm, has good reliability, stability, and high efficiency, making it suitable for complex shielding calculations.

关键词： Shielding calculation Discrete ordinates method Discontinuous Galerkin finite element method Unstructured meshes

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A cellular automata framework for porous electrode reconstruction and reaction-diffusion simulation

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chinese Journal of Chemical Engineering 2023年第8期60卷 262-274页

作者： Jindong dai chi Zhai Jiali Ai Guangren yu Haichao Lv Wei Sun Yongzhong Liu College of Chemical Engineering Beijing University of Chemical TechnologyBeijing 100029China Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China Department of Chemical Engineering Xi’an Jiaotong UniversityXi’an 710049China

Due to the high charge transfer efficiency compared to that of non-porous materials,porous electrodes with larger surface area and thinner solid pore walls have been widely applied in the lithium-ion battery *** the capacity and charge-discharge efficiency of batteries are closely related to the microstructure of porous materials,a conceptually simple and computationally efficient cellular automata(CA)framework is proposed to reconstruct the porous electrode structure and simulate the reactiondiffusion process under the irregular solid-liquid boundary in this *** framework is consisted of an electrode generating model and a reaction-diffusion *** structures with specific geometric properties,i.e.,porosity,surface area,size distribution,and eccentricity distribution can be constructed by the electrode generating *** reaction-diffusion model is exemplified by solving the Fick's diffusion problem and simulating the cyclic voltammetry(CV)*** discharging process in the lithium-ion battery are simulated through combining the above two CA models,and the simulation results are consistent with the well-known pseudo-two-dimensional(P2D)*** addition,a set of electrodes with different microstructures are constructed and their reaction efficiencies are *** results indicate that there is an optimum combination of porosity and particle size for discharge *** framework is a promising one for studying the effect of electrode microstructure on battery performance due to its fully synchronous computation way,easy handled boundary conditions,and free of convergence concerns.

关键词： Mathematical modeling Lithium-ion battery Cellular automata Diffusion Electrochemistry Dynamic simulation

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Prenatal ultrasonography and genetic analysis of fetal cleidocranial dysplasia:A case report

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World Journal of Clinical Cases 2025年第10期13卷 28-34页

作者： Feng Wang Pei-Feng dai Wen-Juan Gao Department of Ultrasonography Weifang People’s HospitalWeifang 261000Shandong ProvinceChina

BACKGROUND Cleidocranial dysplasia(CCD)is an infrequent clinical condition with an autosomal dominant inheritance *** is characterized by abnormal clavicles,patent sutures and fontanelles,supernumerary teeth,and short *** 60%-70%of patients with CCD have mutations in the RUNX family transcription factor 2 ***,prenatal diagnosis of CCD is difficult when the family history is *** SUMMARY We report a rare case of fetal CCD with an unknown family history,confirmed by prenatal ultrasonography and genetic testing at a gestational age of 16 *** genetic reports indicated that the fetus carried pathogenic mutations in the RUNX family transcription factor 2 gene(c.674G>A).After careful consideration,the pregnant woman and her family decided to continue the *** Definitive prenatal diagnosis of CCD should include family history,ultrasound diagnosis,and genetic analysis,especially if family history is unknown.

关键词： Cleidocranial dysplasia Genetic analysis Ultrasonic diagnosis Prenatal Case report

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Peripheral blood RNA biomarkers can predict lesion severity in degenerative cervical myelopathy

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Neural Regeneration Research 2025年第6期20卷 1764-1775页

作者： Zhenzhong Zheng Jialin Chen Jinghong Xu Bin Jiang Lei Li Yawei Li yuliang dai Bing Wang Department of Spine Surgery The Second Xiangya Hospital of Central South UniversityChangshaHunan ProvinceChina

Degenerative cervical myelopathy is a common cause of spinal cord injury,with longer symptom duration and higher myelopathy severity indicating a worse *** numerous studies have investigated serological biomarkers for acute spinal cord injury,few studies have explored such biomarkers for diagnosing degenerative cervical *** study involved 30 patients with degenerative cervical myelopathy(51.3±7.3 years old,12 women and 18 men),seven healthy controls(25.7±1.7 years old,one woman and six men),and nine patients with cervical spondylotic radiculopathy(51.9±8.6 years old,three women and six men).Analysis of blood samples from the three groups showed clear differences in transcriptomic *** analysis identified 128 differentially expressed genes that were enriched in patients with neurological *** least absolute shrinkage and selection operator analysis,we constructed a five-gene model(TBCD,TPM2,PNKD,EIF4G2,and AP5Z1)to diagnose degenerative cervical myelopathy with an accuracy of 93.5%.One-gene models(TCAP and SDHA)identified mild and severe degenerative cervical myelopathy with accuracies of 83.3%and 76.7%,*** of two immune cell types(memory B cells and memory-activated CD4^(+)T cells)predicted levels of lesions in degenerative cervical myelopathy with 80%*** results suggest that peripheral blood RNA biomarkers could be used to predict lesion severity in degenerative cervical myelopathy.

关键词： biomarkers candidate genes degenerative cervical myelopathy gene expression analysis immune cell types neurological disabilities peripheral blood RNA profiles spinal cord injury

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Gut microbiota-astrocyte axis: new insights into age-related cognitive decline

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Neural Regeneration Research 2025年第4期20卷 990-1008页

作者： Lan Zhang Jingge Wei Xilei Liu dai Li Xiaoqi Pang Fanglian Chen Hailong Cao Ping Lei Haihe Laboratory of Cell Ecosystem Department of GeriatricsTianjin Medical University General HospitalTianjinChina Tianjin Geriatrics Institute Tianjin Medical University General HospitalTianjinChina Department of Gastroenterology and Hepatology Tianjin Medical University General HospitalNational Key Clinical SpecialtyTianjin Institute of Digestive DiseasesTianjin Key Laboratory of Digestive DiseasesTianjinChina Department of Urology Tianjin Medical University General HospitalTianjinChina Tianjin Neurological Institution Tianjin Medical University General HospitalTianjinChina

With the rapidly aging human population,age-related cognitive decline and dementia are becoming increasingly prevalent *** is considered the main risk factor for cognitive decline and acts through alterations in the composition of the gut microbiota,microbial metabolites,and the functions of *** microbiota–gut–brain axis has been the focus of multiple studies and is closely associated with cognitive *** article provides a comprehensive review of the specific changes that occur in the composition of the gut microbiota and microbial metabolites in older individuals and discusses how the aging of astrocytes and reactive astrocytosis are closely related to age-related cognitive decline and neurodegenerative *** article also summarizes the gut microbiota components that affect astrocyte function,mainly through the vagus nerve,immune responses,circadian rhythms,and microbial ***,this article summarizes the mechanism by which the gut microbiota–astrocyte axis plays a role in Alzheimer’s and Parkinson’s *** findings have revealed the critical role of the microbiota–astrocyte axis in age-related cognitive decline,aiding in a deeper understanding of potential gut microbiome-based adjuvant therapy strategies for this condition.

关键词： age aging Alzheimer’s disease astrocytes cognitive decline dementia gut microbiota gut–brain axis microbial metabolites neuroinflammation Parkinson’s disease

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