摘要：The tenth BRICS Summit was held in Johannesburg,South Africa in 2018,which attracted attention from the whole ***,it is of great importance to the BRICS nations,for it is the first ten years of BRICS,which marks its ***,this year the Trump administration imposed more strict policies on ***,the trade war between China and the United States is so ***,as the core member of BRICS has great clout on BRICS,so the trade war between China and US also arouse a heat discussion among the BRICS *** the Summit,CGTN invited experts from the five BRICS nations to discuss related *** Functional Linguistics,as one of the most influential branches of Linguistics,was firstly established by ***,and it has been greatly developed over the past *** meaning is one of the three meta-functions,which focuses on how addressers use language to communicate,establish and maintain relationships with addressees,and express their *** and modality are two basic resources to the realization of interpersonal *** is used to represent the interaction of the language users,while modality reflects the utterers’attitudes and *** paper discusses the three aspects of modality:modal operators,modal adjuncts and metaphors of *** paper applies the modality system to the analysis of the transcript of BRICS *** author selects the experts’speeches on the trade war between China and US as the *** research questions are as followed:(1)the characteristics of the modality resources appeared in their talks;(2)the BRICS nations attitudes and stance on trade war and America’s protectionism.

摘要：Currently,FeNi nanoalloys have received considerable attention for the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)in rechargeable aqueous zinc(Zn)-air batteries(ZABs)because of their high content and good chemical ***,their poor electronic conductivity,small surface area,and sluggish activity seriously hinder their catalytic ***,S-modulated FeNi nanoalloys supported by hierarchically porous carbon(SFeNi/PC)are synthesized through the thermal treatment of metal-organic precursors for efficient bifunctional oxygen catalysis.S decoration endows S-FeNi/PC with a superior OER performance while maintaining an ORR performance that is comparable to that of Pt/***,S-FeNi/PC exhibits excellent bifunctional oxygen catalytic activity,outperforming the noble-metal-based composite catalysts of Pt/C and RuO_(2).Notably,the ZABs assembled with S-FeNi/PC exhibit high specific capacity(792 mA h g^(-1)),high peak power density(123.5 mW cm^(-2)),and remarkable durability for 700 charge/discharge cycles at 10 mA cm^(-2),which surpasses the performance of commercially available Pt/C-RuOand other catalysts in previously reported *** study will provide not only new bifunctional oxygen electrodes for efficient ZAB devices but also new insights into the design of FeNi-based materials for a wide range of catalytic applications.

摘要：提出了一个以技术标准为导向的企业研发方向选择的研究框架,运用文本挖掘和社会感知的方法,从技术发展特征和市场发展前景两个角度,更全面地分析了标准相关的研发方向问题。首先,利用文本挖掘技术识别技术标准空白;其次,构建相关研发机会的＂识别-评估＂模型。一方面,设计出由技术活跃性、需求满足度与技术难易性构成的ADR-Dim三维评价模型,通过定量分析实现技术标准研发机会的初步识别;另一方面,利用社会感知分析方法测度公众对研发机会的感知,以此预测相关研发机会的市场发展前景,实现对研发机会的筛选过滤。最后,以陆地无线接入技术标准为例,验证了该方法的可行性和有效性。

摘要：为了让学生更好地了解高分子材料的发展前沿,并能够综合运用高分子物理以及高分子化学方面的理论知识以及基本实验技能,开发了"复合材料中界面结晶形态观察"的研究型实验。实验内容主要包括界面结晶基础知识准备、样品制备、偏光显微镜和扫描电子显微镜观察以及结果讨论分析,涵盖了高分子材料研究的各个环节。通过开展该教学实验,有助于学生更加形象生动地理解不同聚合物结晶形态的形成机理,激发学生的实验热情,并同时提高学生的科研能力和综合知识运用能力,为学生的进一步深造奠定基础。

摘要：为改进传统的肉类解冻方式的不足,提高解冻效率并且保证解冻完成后肉类的营养流失最少,根据先进的低温高湿度解冻理论,设计出低温高湿度解冻保鲜库,实现了肉类解冻以及食品保鲜功能。采用西门子S7-1200作为控制器,通过程序控制库内温湿度在设定范围并通过触摸屏以及计算机进行实时监测与控制。通过现场调试与运行,完善系统的可靠性,达到预期解冻效果,实现新型解冻保鲜模式的设计要求。

摘要：根据齿轮箱箱体的结构特点及技术要求,选择砂型铸造方法进行铸造工艺设计,选择树脂砂作为造型材料。利用ViewCast软件进行充型和凝固模拟,预测铸造缺陷产生位置,分析了充型和凝固过程中铸件产生缺陷的原因。在此基础上,对齿轮箱箱体的铸造工艺方案进行了优化,最终选择阶梯式浇注系统,直浇道、横浇道、内浇道截面积比为1:2:4,冒口选择发热保温冒口,浇注温度为750℃。使用优化后的铸造工艺方案进行了数值模拟及实际浇注试验,发现铸件几乎没有缺陷,满足了实际生产中对铸件质量的要求。

摘要：合成孔径雷达(SAR)阵面电源保护电路直接涉及到阵面电源的可靠性和安全性,也涉及到雷达工作的可靠性和安全性,文中提出了比较新颖的具有容错性设计的指令接收电路、锁定电路以及隔离电路等。试验结果表明分析与设计的正确性,在天线系统联试中,也验证了阵面电源保护电路的有效性。

摘要：新型装配式榫卯预制混凝土围墙是竖向连接采用栓钉干式锚固连接,水平连接采用榫卯式结构连接,在工厂中进行标准构件预制,现场快速组装的新型围墙。为研究其使用阶段的节点受力性能,通过ABAQUS建模,采用有限元方式分析连接的节点及整体受力情况,并对华南理工大学广州国际校区一期工程中新型围墙进行设计施工全过程分析。结果表明,新型装配式榫卯预制混凝土的连接节点满足受力性能要求,同时具有建设施工干式作业、构件快速拆装、材料循环使用等优点。

摘要：结合模糊控制器和变结构控制器的各自优点,给出导弹姿态控制系统的模糊滑模控制,同时为消除模糊滑模控制的能达阶段,在控制器中引入全程滑模因子,最终实现导弹姿态控制系统的全程模糊滑模控制,取得了较好的效果。

摘要：基于高灵敏隧道磁电阻的高精度加速度计中,圆柱磁体数学模型的确定和探寻磁体空间磁场分量线性分布区间是实现加速度高精度测量的关键。针对这个问题,采用磁体空间磁场分布的理论解析计算方法,对磁体空间磁场的分布进行了矢量分解,重点分析计算了磁体外空间磁场的线性分布范围。采用MATLAB软件,获得了磁场各分量在轴向和径向上的变化规律,找出了线性分布的最佳空间位置,并运用COMSOL软件进行验证。依据计算结果,总结出了磁体空间磁场分量的线性区间宽度、径向分量最大值、灵敏度这三者与磁体尺寸、磁化强度、空间位置之间的变化关系,为高精度隧道磁电阻加速度计的设计提供理论依据。