MXene Hollow Spheres Supported by a C–Co Exoskeleton Grow MWCNTs for Efficient Microwave Absorption

High-performance microwave absorption(MA) materials must be studied immediately since electromagnetic pollution has become a problem that cannot be disregarded. A straightforward composite material, comprising hollow MXene spheres loaded with C–Co frameworks, was prepared to develop multiwalled carbon nanotubes(MWCNTs). A high impedance and suitable morphology were guaranteed by the C–Co exoskeleton, the attenuation ability was provided by the MWCNTs endoskeleton, and the material performance was greatly enhanced by the layered core–shell structure. When the thickness was only 2.04 mm, the effective absorption bandwidth was 5.67 GHz, and the minimum reflection loss(RLmin) was-70.70 d B. At a thickness of 1.861 mm, the sample calcined at 700 ℃ had a RLmin of-63.25 d B. All samples performed well with a reduced filler ratio of 15 wt%. This paper provides a method for making lightweight core–shell composite MA materials with magnetoelectric synergy.

Ageing-related bone and immunity changes:insights into the complex interplay between the skeleton and the immune system

Ageing as a natural irreversible process inherently results in the functional deterioration of numerous organ systems and tissues,including the skeletal and immune systems.Recent studies have elucidated the intricate bidirectional interactions between these two systems.

Rational design of carbon skeleton interfaces for highly reversible sodium metal battery anodes

Sodium metal batteries(SMBs)have attracted increasing attention over time due to their abundance of sodium resources and low cost.However,the widespread application of SMBs as a viable technology remains a great challenge,such as uneven metallic deposition and dendrite formation during cycling.Carbon skeletons as sodiophilic hosts can alleviate the dendrite formation during the plating/stripping.For the carbon skeleton,how to rationalize the design sodiophilic interfaces between the sodium metal and carbon species remains key to developing desirable Na anodes.Herein,we fabricated four kinds of structural features for carbon skeletons using conventional calcination and flash Joule heating.The roles of conductivity,defects,oxygen content,and the distribution of graphite for the deposition of metallic sodium were discussed in detail.Based on interface engineering,the J1600 electrode,which has abundant Na-C species on its surface,showed the highest sodiophilic.There are uniform and rich F-Na species distributed in the inner solid electrolyte interface layer.This study investigated the different Na-deposition behavior in carbon hosts with distinct graphitic arrangements to pave the way for designing and optimizing advanced electrode materials.

Vacancy defect MoSeTe embedded in N and F co-doped carbon skeleton for high performance sodium ion batteries and hybrid capacitors

Sodium-ion batteries(SIBs) and hybrid capacitors(SIHCs) have garnered significant attention in energy storage due to their inherent advantages,including high energy density,cost-effectiveness,and enhanced safety.However,developing high-performance anode materials to improve sodium storage performa nce still remains a major challenge.Here,a facile one-pot method has been developed to fabricate a hybrid of MoSeTe nanosheets implanted within the N,F co-doped honeycomb carbon skeleton(MoSeTe/N,F@C).Experimental results demonstrate that the incorporation of large-sized Te atoms into MoSeTe nanosheets enlarges the layer spacing and creates abundant anion vacancies,which effectively facilitate the insertion/extraction of Na^(+) and provide numerous ion adsorption sites for rapid surface capacitive behavior.Additionally,the heteroatoms N,F co-doped honeycomb carbon skeleton with a highly conductive network can restrain the volume expansion and boost reaction kinetics within the electrode.As anticipated,the MoSeTe/N,F@C anode exhibits high reversible capacities along with exceptional cycle stability.When coupled with Na_(3)V_(2)(PO_(4))_(3)@C(NVPF@C) to form SIB full cells,the anode delivers a reversible specific capacity of 126 mA h g^(-1) after 100 cycles at 0.1 A g^(-1).Furthermore,when combined with AC to form SIHC full cells,the anode demonstrates excellent cycling stability with a reversible specific capacity of50 mA h g^(-1) keeping over 3700 cycles at 1.0 A g^(-1).In situ XRD,ex situ TEM characterization,and theoretical calculations(DFT) further confirm the reversibility of sodium storage in MoSeTe/N,F@C anode materials during electrochemical reactions,highlighting their potential for widespread practical application.This work provides new insights into the promising utilization of advanced transition metal dichalcogenides as anode materials for Na^(+)-based energy storage devices.

Terpene extract from the stem of Celastrus orbiculatus inhibits actin cytoskeleton remodelling in gastric cancer cells by regulating the protein interaction between PTBP1 and ACTN4

Adjuvant chemoradiotherapy,molecular targeted therapy,and immunotherapy are frequently employed to extend the survival of patients with advanced gastric cancer(GC).However,most of these treatments have toxic side effects,drug resistance,and limited improvements in survival and quality of life.Therefore,it is crucial to discover and develop new medications targeting GC that are highly effective and have minimal toxicity.In previous studies,the total terpene extract from the stem of Celastrus orbiculatus demonstrated anti-GC activity;however,the specific mechanism was unclear.Our research utilising coimmunoprecipitation-mass spectrometry(Co-IP-MS),polypyrimidine tract binding protein 1(ptbp1)clustered regularly interspaced short palindromic repeat-associated protein 9(Cas9)-knockout(KO)mouse model,tissue microarray,and functional experiments suggests that alpha actinin-4(ACTN4)could be a significant biomarker of GC.PTBP1 influences actin cytoskeleton restructuring in GC cells by interacting with ACTN4.Celastrus orbiculatus stem extract(COE)may directly target ACTN4 and affect the interaction between PTBP1 and ACTN4,thereby exerting anti-GC effects.

MOF基ZnO/NiO@C复合材料作为高性能锂离子电池负极材料

通过简单的溶剂热法和煅烧法制备了MOF衍生的ZnO/NiO@C多孔纳米复合材料,采用傅里叶红外光谱(FT-IR)、扫描电镜(SEM)、X射线衍射(XRD)对其微观形貌和结构进行表征,利用X射线光电子能谱(XPS)分析了复合材料的元素组成,通过氮气吸附/脱附实验测试了复合材料的比表面积和孔径分布,结果表明:复合材料具有高比表面积和一定数量的介孔,在100 mA/g电流密度下,ZnO/NiO@C电极首次放电比容量为1489.7 mAh/g,循环400次后的可逆比容量为1078.0 mAh/g,容量保持率为72.4%。此外,通过不同倍率的充放电实验,电极的比容量可以恢复到初始倍率的75.28%,测试结果表明ZnO/NiO@C电极具有优异的循环性能和较好的倍率性能,良好的电化学性能是由于其多孔结构、高比表面积和丰富的电化学活性位点,降低了电荷的传递阻力,促进了离子的扩散,提高了倍率性能和循环稳定性。

中华美学史的性质及内在逻辑论

对于中华美学史的性质及内在逻辑,可以从五个方面展开论述:第一,中华美学的民族性。中华美学是中华民族的美学,中华民族文化以汉文化为灵魂,却绝不只是汉族文化,它熔铸了生活在中国大地上的诸多民族的文化精神,突出体现了中华民族共同的理念、精神、传统。第二,中华美学的国家性。中华美学的国家性奠基于周朝,周朝的礼乐文化既是政治文化,又是审美文化。中华文化中的主要学派儒、道、墨等的美学思想均见出鲜明的国家性。第三,中华美学的文化骨架。其根植于中华文化的三大流派:儒、道、释。儒家美学重社会,道家美学重自然,释家美学重心性。三者相对而又互补,共同构成中华美学的文化骨架。第四,中华美学的诗性品位。《诗经》《楚辞》和唐诗的巨大影响构建了中华美学的诗性品位。第五,中华美学的基本精神。其体现在对审美本体论的认识上,道家的美在自然与儒家的美在文明的统一,构成了中华美学的基本精神。

基于UFAC应力吸收层的抗反射裂缝性能评价

目的为了解决“白加黑”技术中的反射裂缝问题,针对目前常用的悬浮密实型高弹改性沥青混合料(super flexible asphalt concrete,SFAC)应力吸收层变形量较大、容易造成上部沥青加铺层不利于受力的缺陷,方法提出基于CAVF法和富沥青理念优化设计的骨架密实型UFAC应力吸收层。采用有限元ABAQUS数值模拟方法对“白加黑”路面结构进行受力分析,并通过加速加载试验、冲击韧性试验和劈裂试验对材料与结构的抗反射裂缝性能进行评价。结果重载条件下,UFAC应力吸收层和高弹改性沥青应力吸收层的竖向位移相差5.93×10^(-2)mm,沥青加铺层底部所受竖向压应力σy、最大主应力σ_(max)、最大剪应力τ_(12)分别降低24%,32.3%,27.7%。当路面存在严重脱空或常规脱空情况时,基于UFAC应力吸收层的路面结构比GAC加铺路面结构的抗疲劳开裂性能分别提升48%,36%。与传统的悬浮型砂粒式AC-5应力吸收层相比,UFAC-5应力吸收层的冲击韧性增加60.8%,劈裂抗拉强度提高16.8%。结论基于UFAC应力吸收层的沥青加铺技术,通过增大常规改性沥青膜厚保证必要的疲劳抗拉能力,并采用骨架密实型级配显著提高集料间的嵌挤能力和内摩阻力,减小层间结构变形,可有效减缓沥青加铺层反射裂缝的产生与发展。

Skeletonization技术及其在深地震反射剖面解释中的应用

"深部探测技术与实验研究"(SINOPROBE)专项的启动揭开了中国"入地"计划的序幕.大规模的深地震反射剖面是该计划最重要的组成部分之一,如何从深地震反射剖面中获取更多有用的信息成为我们即将面临的重要课题.Skeletonization技术是西方国家在实施深部探测计划时发展的一项深地震剖面信息提取分析技术,对我们具有重要的借鉴意义.本文在研究前人工作的基础上,综述了Skeletonization技术的基本原理及其在国内外的发展,并在此基础上介绍了该技术在深地震反射剖面解释中的应用,最后结合我国刚刚启动的SINOPROBE计划对其进一步的发展进行了展望.

乳内动脉skeleton取材法在冠状动脉旁路移植术中的应用

目的 评价乳内动脉skeleton取材法在冠状动脉旁路移植术（CABG）中的应用及其效果。方法 277例接受CABG的患者（其中合并糖尿病33例）在术中分离乳内动脉的过程中，仅使用剪刀和钛夹来分离乳内动脉，即不附带任何周围组织的skeleton取材法游离一侧或两侧乳内动脉，其中21例糖尿病患者取用双侧乳内动脉；并观察患者术中、术后的临床结果。采用非体外循环CABG5例，体外循环CABG272例。结果 体外循环时间60～217min，平均90．1min；主动脉阻断时间30～160min，平均53．3min。手术死亡率2．2％（6／277）。手术中见乳内动脉桥质量良好，动脉桥血流量满意；术后移植血管通畅，心绞痛症状消失。取用双侧乳内动脉和糖尿病患者亦未出现更高的胸骨感染率。手术后冠状动脉造影显示乳内动脉血管桥通畅。结论 乳内动脉skeleton取材法有良好的血管桥通畅率，对患者胸骨创伤较小，对糖尿病患者取用双侧乳内动脉不再是禁忌证。

Rock skeleton models and seismic porosity inversion

By substituting rock skeleton modulus expressions into Gassmann approximate fluid equation, we obtain a seismic porosity inversion equation. However, conventional rock skeleton models and their expressions are quite different from each other, resuling in different seismic porosity inversion equations, potentially leading to difficulties in correctly applying them and evaluating their results. In response to this, a uniform relation with two adjusting parameters suitable for all rock skeleton models is established from an analysis and comparison of various conventional rock skeleton models and their expressions including the Eshelby-Walsh, Pride, Geertsma, Nur, Keys-Xu, and Krief models. By giving the two adjusting parameters specific values, different rock skeleton models with specific physical characteristics can be generated. This allows us to select the most appropriate rock skeleton model based on geological and geophysical conditions, and to develop more wise seismic porosity inversion. As an example of using this method for hydrocarbon prediction and fluid identification, we apply this improved porosity inversion, associated with rock physical data and well log data, to the ZJ basin. Research shows that the existence of an abundant hydrocarbon reservoir is dependent on a moderate porosity range, which means we can use the results of seismic porosity inversion to identify oil reservoirs and dry or water-saturated reservoirs. The seismic inversion results are closely correspond to well log porosity curves in the ZJ area, indicating that the uniform relations and inversion methods proposed in this paper are reliable and effective.

基于Skeleton Design的脱粒装置交互式设计系统研究

针对联合收获机脱粒装置设计过程中装备结构复杂、参数化变形设计困难以及对设计人员专业素质要求高的问题,为寻求合适的参数化设计手段,研究了基于Skeleton Design(骨架设计)的脱粒装置交互式设计系统。以纹杆滚筒式脱粒装置为研究对象,引入Skeleton Design过程体的概念,结合纹杆滚筒式脱粒装置的总体设计过程,实现脱粒装置的个性化设计与参数化建模。以VS(Microsoft Visual Studio)环境下VB.NET为开发语言,应用CATIA(Computer aided tri-dimensional interface application)二次开发接口技术与SQL Server数据库管理,将模型、参数、知识信息等数字化资源与操作平台组织起来,联合运用,通过人机交互的方式进行产品设计。系统测试表明,该系统能在降低设计人员专业性、提高开发产品准确性的同时,提高设计效率、缩短设计周期,并且易于理解和应用,增强了模型的知识继承与重用性,满足脱粒装置个性化设计要求。

Skeleton extraction of boiler flame images based on mathematical morphology

In this paper, a method and algorithm of skeleton extraction based on binary mathematical morphology is presented. Sequential structuring elements (SEs) is also studied, which is the key problem of skeleton extraction. The examples of boiler flame image processing show that the detected skeletons can present the geometric shape of flame images well.

对数动态骨架本构模型的多维实现及其在ABAQUS中的应用

对数动态骨架本构以对数函数作为骨架曲线,引入“修正动骨架曲线”和“阻尼比退化系数”的概念,考虑试验阻尼对滞回曲线的影响,实现试验阻尼和滞回阻尼在数学上自洽的非线性动力本构。该本构只适用于一维土层场地时域非线性地震反应分析。基于对数动态骨架本构函数关系式,给出对数动态骨架参数的求解方法,并推导出加卸载曲线的时变切线剪切模量。通过ABAQUS软件的操作平台和等效剪应变算法,开发了基于对数动态骨架本构模型的显式子程序模块,该模型适用于二维和三维土层场地非线性地震反应分析。选取含软弱淤泥质土层场地作为计算模型,将从基岩输入不同加速度峰值的EI centro地震动的数值模拟结果进行对比,验证可考虑土体阻尼效应的对数动态骨架本构以及开发子程序的合理性和可用性。

不同品种糯高粱在酱香型白酒生产中的应用

高粱品种影响酱香型白酒发酵进程以及基酒品质。对贵友(GY)、国台(GT)、致茂(ZM)、颖新(YX)、红穗(HS)、高粱地(GLD)6种糯高粱进行投粮生产试验,从原料、发酵酒醅、基酒理化指标、骨架成分以及感官品评等方面进行对比。结果表明,利用主成分分析可将6个品种糯高粱样品分为3类,其中淀粉、单宁含量差距并不显著(P>0.05);6种糯高粱在1~6轮次窖内发酵期间理化因子变化规律一致,幅度相差较大;随着轮次的进行,基酒的酒精度从52%vol~57%vol显著降低,GLD、ZM、YX 3种糯高粱在生产基酒时酒精度较高;在基酒品评维度,各类糯高粱具有不同优势贡献;白酒骨架成分中,ZM高粱酿造基酒中酸类、醛类平均含量最高为0.39、0.24 g/L,而HS高粱酿造基酒酯、醇平均含量最高为1.17、0.94 g/L;通过香气活性值分析得出,8种风味物质如乙醛、乙酸乙酯等对基酒香气特征具有重要作用;应用偏最小二乘判别分析能较好地区分不同品种糯高粱酿造基酒风味区别,确定出变量重要性因子7种,包括异丁醇、乙缩醛、仲丁醇等。该研究阐明了高粱品种对酿造整体的影响,为建立科学原料验收标准,筛选出适合酱香型白酒酿造的原料提供理论参考。

沉浸式钢架雪车滑行仿真系统研究与实现

钢架雪车作为冬季奥运会的滑行项目之一,具有滑行速度快、赛道复杂、危险性高的特点,为降低在实际滑行过程中产生事故的风险,应用虚拟现实技术构建了一套沉浸式钢架雪车滑行仿真系统。基于激光扫描获取的点云数据进行现有赛道建模,实现在虚幻4引擎中构建虚拟场馆赛道与钢架雪车滑行运动模型;通过动作捕捉采集数据实现模拟滑行力学操控输入,并获取模拟滑行钢架雪车姿态,通过六自由度振动台反馈给使用者。该系统可实现安全条件下的钢架雪车模拟滑行,为运动员提供熟悉赛道、安全训练的手段。

油液过滤器滤芯骨架的强度与稳定性分析

过滤器是液压系统清洁油液的元件,油液颗粒污染物会逐渐堵塞过滤器的滤网,使滤网两侧油液压差增大。当压差超过滤芯骨架的临界承载压力,骨架会发生压溃失效故障。为研究过滤器堵塞情况下,骨架受外压作用产生的强度变化情况,以某型油液过滤器为研究对象,通过非线动力学和非线性屈曲仿真,求解骨架等效应力和变形。结果发现滤芯骨架压差超过13.5 MPa时,最大等效应力超过材料屈服强度,有发生塑性变形的风险。骨架失稳I阶非线性屈曲载荷为13.5 MPa,失稳变形量10.59 mm,大于过滤器骨架失效变形标准;最大应力为963.7 MPa,超过材料屈曲强度。此时骨架在结构弱化效应作用下失去了原有刚度,发生了阶跃失稳,导致骨架压溃失效。研究结论为过滤器临界载荷预判和设计提供一定参考。

异形GRC幕墙结构卡槽式连接施工技术及有限元分析

针对宁波国际会议中心室外廊桥外侧幕墙特殊需求,提出了复杂异形GRC幕墙施工技术。通过全装配式施工工艺、BIM模型深化技术、外伸牛腿+U形槽的连接形式、优化幕墙组件安装顺序等,确保了GRC幕墙高效、可靠安装。同时,为解决传统异形GRC幕墙结构设计及施工方案中存在的现场装配率低、施工工序繁琐、施工效率低及施工质量不易控制等问题,提出一种新型异形GRC幕墙结构卡槽式连接设计。该连接形式包括幕墙板背附骨架结构和外伸钢牛腿+U形槽连接节点,具有构造简单、可实现全装配式安装等优点。通过有限元分析可知,提出的卡槽式GRC幕墙节点具有足够连接强度。

地下工程预制梁钢筋骨架技术研究

随着地下工程施工对支撑结构质量和施工效率要求的提升,传统混凝土支撑结构施工质量和工期难以保障。预制梁钢筋骨架技术能够有效提高地下工程施工效率和质量,实现快速、标准化的施工流程,提高了施工效率,具有质量可控、施工风险低等优势。然而,该技术在发展中仍面临一些问题,包括技术标准不统一、设计与制造协作不够紧密、运输安装存在困难等。为解决这些问题,以南京市建宁西路过江通道项目为例,对预制梁钢筋骨架进行了标准化分段研究,研发了标准化制作台和超长预制梁钢筋骨架吊装对接技术。通过标准化分段、制作台研发和吊装对接标准的提出,为预制梁钢筋骨架技术的实际应用提供了高效、安全、可靠的技术方案,取得了显著效果。

基于点云数据的改进型焊缝骨架提取算法

为了满足机器人焊缝磨削的要求,提出了一种基于点云数据的改进型焊缝骨架提取算法。该方法首先采用基于八叉树的体素滤波对焊缝原始点云进行降采样,然后使用随机采样和WLOP算子获取初始骨架点,接着通过迭代收缩提取焊缝骨架,引入斥力函数避免错误分支的生成,最后通过拟合曲线连接骨架线。实验结果表明:该算法能够适应多种不同类型的焊缝,提取出质量良好的焊缝骨架,并正确地表达焊缝的主体特征。