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Effects of diamond particle size on microstructure and properties of diamond/Al-12Si composites prepared by vacuum-assisted pressure infiltration

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China Foundry 2024年第4期21卷 360-368页

作者： Jia-ping Fu Can-xu zhou Guo-fa Mi Yuan Liu School of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo 454100HenanChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China

Diamond/aluminium composites have attracted attention in the field of thermal management of electronic packaging for their excellent *** order to solve the interfacial problem between diamond and aluminium,a novel process combining pressure infiltration with vacuum-assisted technology was proposed to prepare diamond/aluminum *** effect of diamond particle size on the microstructure and properties of the diamond/Al-12Si composites was *** results show that the diamond/Al-12Si composites exhibit high relative density and a uniform *** thermal conductivity and coefficient of thermal expansion increase with increasing particle size,while the bending strength exhibits the opposite *** the average diamond particle size increases from 45μm to 425μm,the thermal conductivity of the composites increases from 455 W·m^(-1)·K^(-1)to 713 W·m^(-1)·K^(-1)and the coefficient of thermal expansion increases from 4.97×10^(-6)K^(-1)to 6.72×10^(-6)K^(-1),while the bending strength decreases from 353 MPa to 246 *** research demonstrates that high-quality composites can be prepared by the vacuum-assisted pressure infiltration process and the thermal conductivity of the composites can be effectively improved by increasing the diamond particle size.

关键词： diamond/aluminum composites thermal conductivity electronic packaging vacuum-assisted pressure infiltration

Identification and Expression Profile of a Neuropeptide LFRFamide-Like Gene During Different Stages of Gonadal Development in the Cephalopod Sepia pharaonis

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Journal of Ocean University of China 2024年第2期23卷 499-508页

作者： QIU Jiayin SUN Lianlian LI Shuang zhou xu CHI Changfeng ZHENG Libing National and Provincial Joint Engineering Research Center for Marine Germplasm Resources Exploration and Utilization School of Marine Science and TechnologyZhejiang Ocean UniversityZhoushan 316022China

Neuropeptides are widely distributed in vertebrates and invertebrates,regulating a variety of physiological activities in the organisms,such as metabolism,feeding and *** this study,to explore the function of neuropeptide LFRFamide in Sepia pharaonis,the full-length cDNA of LFRFamide-like gene(named SpLFRFL,MG869822.1)was identified with rapid amplification of cDNA ends(RACE)*** sequence of SpLFRFL was 860 bp in length and encoded 188 amino acids containing 4 different mature peptides:1 copy of PHTPFRFamide,NSLFRFamide,TIFRFamide,and 3 copies of *** alignment and phylogenetic analysis results showed that SpLFRFL shared high identity with LFRFamides of Sepia officinalis and Sepiella japonica and had the closest relationship with *** quantitative Real-time PCR(qRT-PCR),it was found that the SpLFRFL gene was highly expressed in the optic lobe and brain at three different stages during gonad development in both ***,the four mature peptides at a concentration of 0.01μmol L^(−1) could inhibit the protein synthesis in the Chinese hamster ovary cell strain-K1(CHOK1)induced by *** data suggest that SpLFRFL might be involved in the development and reproduction of *** results can contribute to future studies on neuropeptide evolution and function and benefit the cuttlefish farming.

关键词： neuropeptide LFRFamide-like cephalopod cuttlefish Sepia pharaonis development reproduction

Towards growth of pure AB-stacked bilayer graphene single crystals

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Nano Research 2024年第5期17卷 4616-4621页

作者： Xiaowen Zhang Tao zhou Yunlong Ren Zuo Feng Ruixi Qiao Qinghe Wang Bin Wang Jinxia Bai Muhong Wu Zhilie Tang xu zhou Kaihui Liu Xiaozhi xu Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSchool of PhysicsSouth China Normal UniversityGuangzhou 510006China Guangdong-Hong Kong Joint Laboratory of Quantum Matter School of PhysicsSouth China Normal UniversityGuangzhou 510006China Physical Science and Engineering Division King Abdullah University of Science and TechnologyThuwal 23955–6900Saudi Arabia State Key Laboratory for Mesoscopic Physics Frontiers Science Center for Nano-optoelectronicsSchool of PhysicsPeking UniversityBeijing 100871China Institute for Frontier Science Nanjing University of Aeronautics and AstronauticsNanjing 210094China International Centre for Quantum Materials Collaborative Innovation Centre of Quantum MatterPeking UniversityBeijing 100871China Songshan Lake Materials Laboratory Institute of PhysicsChinese Academy of SciencesDongguan 523808China

Given its intriguing band structure and unique tunable bandgap,AB-stacked bilayer graphene has great potentials in the applications of high-end electronics,optoelectronics and *** epitaxial growth of AB-stacked single-crystal bilayer graphene films requires a strict AB-stacked lattice,identical orientations and seamless stitching of bilayer graphene ***,the particles inevitably present on the metal surface that produced during high temperature growth would induce random orientations,twisted stacking islands,and uncontrollable multilayers,which is a great challenge to ***,we propose a heat-resisting-box assisted strategy to produce nearly pure AB-stacked bilayer graphene single-crystal films on Cu/Ni(111)*** our technique,the particles on the Cu/Ni(111)surface are effectively eliminated,which greatly minimizes the occurrence of randomly twisted islands and uncontrollable *** as-grown AB-stacked bilayer graphene films show>99%alignment and>99%AB stacking *** work provides a promising method towards the growth of pure AB-stacked bilayer graphene single crystals and would accelerate its device applications.

关键词： bilayer graphene AB stacking uniform growth heat-resisting box

Hemodialysis bilayer bionic blood vessels developed by the mechanical stimulation of hepatitis B viral X(HBX)genetransfected hepatic stellate cells

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第6期25卷 499-512页

作者： Hongyi LIU Yuanyuan zhou Peng GUO Xiongwei ZHENG Weibin CHEN Shichao ZHANG Yu FU xu zhou Zheng WAN Bin ZHAO Yilin ZHAO Department of Oncology and Vascular Interventional Radiology Zhongshan Hospital Affiliated to Xiamen UniversitySchool of MedicineXiamen UniversityXiamen 361004China School of Medicine Xiamen UniversityXiamen 361102China Xiamen Health and Medical Big Data Center Xiamen 361008China Fujian Provincial Key Laboratory of Chronic Liver Disease and Hepatocellular Carcinoma(Zhongshan Hospital Affiliated to Xiamen University) Xiamen 361004China Xiamen Key Laboratory of Cellular Intervention and Interventional Medical Materials Xiamen 361004China

Artificial vascular graft(AVG)fistula is widely used for hemodialysis treatment in patients with renal ***,it has poor elasticity and compliance,leading to stenosis and *** ideal artificial blood vessel for dialysis should replicate the structure and components of a real artery,which is primarily maintained by collagen in the extracellular matrix(ECM)of arterial *** have revealed that in hepatitis B virus(HBV)-induced liver fibrosis,hepatic stellate cells(HSCs)become hyperactive and produce excessive ECM ***,mechanical stimulation can encourage ECM secretion and remodeling of a fiber *** on the above factors,we transfected HSCs with the hepatitis B viral X(HBX)gene for simulating the process of HBV ***,these HBX-HSCs were implanted into a polycaprolactonepolyurethane(PCL-PU)bilayer scaffold in which the inner layer is dense and the outer layer consists of pores,which was mechanically stimulated to promote the secretion of collagen nanofiber from the HBX-HSCs and to facilitate crosslinking with the *** obtained an ECM-PCL-PU composite bionic blood vessel that could act as access for dialysis after ***,the vessel scaffold was implanted into a rabbit’s neck arteriovenous fistula *** exhibited strong tensile strength and smooth blood flow and formed autologous blood vessels in the rabbit’s *** study demonstrates the use of human cells to create biomimetic dialysis blood vessels,providing a novel approach for creating clinical vascular access for dialysis.

关键词： Composite bilayer bionic blood vessel Extracellular matrix(ECM) Hepatic stellate cells(HSCs) Hepatitis B viral X(HBX)gene Mechanical force

HSA shrinkage optimizes the photostability of embedded dyes fundamentally to amplify their efficiency as photothermal materials

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Chinese Chemical Letters 2024年第8期35卷 211-216页

作者： Yongkang Yue zhou xu Kaiqing Ma Fangjun Huo xuemei Qin Kuanshou Zhang Caixia Yin Department Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education Institute of Molecular ScienceShanxi UniversityTaiyuan 030006China Department Modern Research Center for Traditional Chinese Medicine Shanxi UniversityTaiyuan 030006China Research Institute of Applied Chemistry Shanxi UniversityTaiyuan 030006China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China

Focused on the performance promotion of organic small molecular dyes based photothermal agents via non-chemical modification,we found that heat-assisted binding of human serum albumin(HSA)to the dye causes shrinkage of the protein and encapsulate the dye to form *** revolutionizes the photostability of small molecule dyes which further improves their photothermal conversion effi-ciency and tumor ablation performance as photothermal agents *** this work,the obtained photothermal agent named HSA-P2-T could accumulate in tumor and induce 22℃enhancement of the tumor in xenograft models upon ultra-low dose(0.1 W/cm^(2))laser irradiation,which,as far as we know,is the lowest laser dose used in vivo photothermal *** HSA-P2-T,we realized tumor ablation upon twice intravenous injections of the nanoparticles and four photothermal treatments.

关键词： Photothermal therapy Cyanine dyes Photostability Albumin Encapsulation

A Study on the Application of Peer Feedback among EFL Students in Blended Teaching

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Journal of Educational Theory and Management 2024年第2期8卷 20-24页

作者： zhou xu School of Foreign Languages Hubei UniversityWuhanHubei430000China

Recent years have witnessed the rise and popularity of blended teaching for EFL students,yet the lack of face-to-face communication and insufficient interaction lead researchers and educators to explore methods of improving the effectiveness of *** feedback,a teaching strategy used to raise the bars by exposing instructions to a new teaching perspective to enhance students’online and offline collaboration,has received the lion’s share of attention in recent *** the basis of literature review,class records,and interviews,this paper,in hope of supporting advances in teachers’practice and field researches,examines the possible approaches to effectively implementing the application of peer feedback in blended teaching mode with a special focus on teachers’roles.

关键词： Peer Feedback EFL Blended Teaching

Tandem asymmetric dearomatized functionalization reaction of phenols with Evans-ynamides enabled by divergent electrophiles

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Science China Chemistry 2024年

作者： Ying-Qi Zhang Gan-Lu Qian Yun Liu Jia-Hui Li Xin Hong zhou xu Bo zhou Long-Wu Ye State Key Laboratory of Physical Chemistry of Solid Surfaces Key Laboratory of Chemical Biology of Fujian Province and College of Chemistry and Chemical Engineering Xiamen University Center of Chemistry for Frontier Technologies Department of Chemistry State Key Laboratory of Clean Energy Utilization Zhejiang University Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy School of Pharmacy Xuzhou Medical University State Key Laboratory of Elemento-Organic Chemistry Nankai University State Key Laboratory of Organometallic Chemistry Chinese Academy of Sciences

Herein, we disclose a highly regio-/chemoselective tandem asymmetric dearomatized halofunctionalization reaction of phenoltethered ynamides with diverse electrophilic halogenation sources in a catalyst-free manner for the practical and rapid assembly of a series of halogenated spirocyclic enones. Besides, the related dearomatized selenation and protonation are also achieved,affording the corresponding selenated and protonated spirocycles in high efficiency. Moreover, the enantioselectivities of these products can be perfectly induced by Evans auxiliaries (99%ees). Significantly, this protocol not only represents the first tandem asymmetric halofunctionalization reaction of phenol derivatives, but also constitutes the first asymmetric halogenation/selenation of ynamides. Theoretical calculations indicate a remote induction model of Evans chiral auxiliary-attached keteniminium.

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知识传授与能力转化的合一:教学实践的方法论转向

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课程．教材．教法 2024年第4期44卷 59-65页

作者：周序王卉北京师范大学教育学部北京100875

如何有效地将学生所学知识转化为自身能力,一直是教学中的难点。传统“学以致用”的思路主张在知识教学之后,为学生提供应用知识的机会,但这种思路加重了学生学习的负担,能力提升的效果也并不明显。“儿童中心”论者主张将学生的经验改... 详细信息

如何有效地将学生所学知识转化为自身能力,一直是教学中的难点。传统“学以致用”的思路主张在知识教学之后,为学生提供应用知识的机会,但这种思路加重了学生学习的负担,能力提升的效果也并不明显。“儿童中心”论者主张将学生的经验改造为知识或者在经验的基础上建构新知,从而使知识学习是通过实践运用的方式来完成的,知识教学与能力提升被统一起来,但这种教学思路拉低了知识的层次,降低了课堂教学的质量。因此,高质量的课堂教学需要坚持知识的核心地位,并通过教师对知识的技术化处理让学生感受知识的魅力。同时,也要为学生提供“即将运用知识”的场景,让学生获得边学边用、反复尝试、不断进步的机会。这样,知识传授的过程也是学生应用知识的过程,从而实现知识传授与能力转化的合一。

关键词：知识传授能力转化课堂教学方法论转向

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教师培训如何逾越理论与实践之间的鸿沟

教育科学 2024年第4期40卷 67-72页

作者：周序王卉北京师范大学教育学部

长期以来，教师培训当中理论知识与实践案例之间存在着巨大的鸿沟。一线教师往往对培训所传授的理论知识不感兴趣，但培训若仅停留于对案例经验的介绍，则对一线教师的专业水平提升又帮助不大。解决这一问题的关键在于让理论和实践“相... 详细信息

长期以来，教师培训当中理论知识与实践案例之间存在着巨大的鸿沟。一线教师往往对培训所传授的理论知识不感兴趣，但培训若仅停留于对案例经验的介绍，则对一线教师的专业水平提升又帮助不大。解决这一问题的关键在于让理论和实践“相互进入”,即培训专家要主动进入实践当中，并带领和帮助一线教师进入理论当中。这种“相互进入”,可以通过“两次跨越”的机制来实现。培训专家需要从理论跨越到实践当中，从而根据理论知识来有针对性地筛选相关的培训案例；再从案例出发带领受训教师跨越回到理论当中，引导教师逐步理解隐藏在案例背后的理论知识。如是，则有望逾越教师培训当中理论与实践之间的鸿沟。

关键词：教师培训理论实践 “两次跨越”