摘要：Conductive and transparent dipeptide hydrogels are desirable building blocks to prepare soft electronic devices and wearable biosensors due to their excellent biocompatibility,multi-functionality,and physiochemical properties similar to those of body ***,the preparation of such hydrogels featuring high conductivity and transparency is a huge challenge because of the hydrophobic feature of conductive additives making the doping process *** overcome this issue,hydrophilic conductive polydopamine(PDA)-doped polypyrrole(PPy)nanoparticles are introduced into the dipeptide hydrogel networks to form conductive nanofibrils in situ to achieve a good level of hydrophilic templating of the hydrogel *** tech-nique creates a complete conductive network and allows visible light to pass *** strategy proposed herein not only endows the dipeptide hydrogel with good conductivity and high transparency,but also provides a great potential application of conductive dipeptide hydrogels for body-adhered signal detection,as evidenced by the experimental data.

摘要：Three-dimensional （3D） bioprinting is a computer-assisted technology which precisely controls spatial position of biomaterials, growth factors and living cells, offering unprecedented possibility to bridge the gap between structurally mimic tissue constructs and functional tissues or organoids. We briefly focus on diverse bioinks used in the recent progresses of biofabrication and 3D bioprinting of various tissue architectures including blood vessel, bone, cartilage, skin, heart, liver and nerve systems. This paper provides readers a guideline with the conjunction between bioinks and the targeted tissue or organ types in structuration and final functionalization of these tissue analogues. The challenges and perspectives in 3D bioprinting field are also illustrated.

摘要：As surgical procedures transition from conventional resection to advanced tissue-regeneration technologies,human disease therapy has witnessed a great leap *** particular,three-dimensional(3D)bioprinting stands as a landmark in this setting,by promising the precise integration of biomaterials,cells,and bioactive molecules,thus opening up a novel avenue for tissue/organ *** by the editorial board of Bio-Design and Manufacturing,this review brings together a cohort of leading young scientists in China to dissect the core functionalities and evolutionary trajectory of 3D bioprinting,by elucidating the intricate challenges encountered in the manufacturing of transplantable *** further delve into the translational pathway from scientific research to clinical application,emphasizing the imperativeness of establishing a regulatory framework and rigorously enforcing quality-control ***,this review outlines the strategic landscape and innovative achievements of China in this field and provides a comprehensive roadmap for researchers worldwide to propel this field collectively to even greater heights.

摘要：In this work, a facile strategy is proposed to construct stretchable electronics based on agarose hydrogels. The hot agarose solution is casted onto a template with patterned Ag nanowires, endowing agarose hydrogel with patterned conductive surface. After further heating treatment, Ag nanowires can be embedded into the agarose hydrogel, which improves the stability of Ag pattern and has no obvious e ffect on the conductivity of hydrogels. The agarose hydrogel with patterned Ag nanowires is certi fied to be an e ffective stretchable electrode to record the motion of joints, which has great potential applications in the field of wearable devices.

摘要：离子液体(ILs)改性固体催化剂是一种构筑高效电催化界面的方法。为了研究ILs阳离子在催化剂中Pt表面对燃料电池中氧还原反应(ORR)性能的影响,本研究自主合成了两种疏水质子型ILs ([EIM][NTf_(2)],[BIM][NTf_(2)])和两种疏水非质子型ILs([EMIM][NTf_(2)],[BMIM][NTf_(2)]),并对商业化Pt/C进行改性。在本研究采用的咪唑类疏水ILs中,质子型ILs改性催化剂的ORR活性均高于非质子型ILs改性催化剂,其中,由1-丁基咪唑双(三氟甲磺酰)亚胺改性后的催化剂([BIM][NTf_(2)]@Pt/C)活性最高。在酸性半电池中ORR半波电位高达0.913 V (***),质量活性提升至商业化Pt/C的1.73倍,比活性提升至商业化Pt/C的3倍,同时达到5000圈循环后半波电位仅下降12 mV,性能仍高于商业化Pt/C。进一步材料表征和电化学测试表明,[BIM][NTf_(2)]@Pt/C电催化活性的增强归因于该ILs可增多Pt表面参与反应活性位点、强化Pt表面质子及质量传递,并可有效抑制Pt纳米颗粒溶解,从而起到了增强ORR活性及稳定性的作用。本研究深化了对ILs@Pt界面协同电催化机理的认识,为设计下一代高效燃料电池催化剂提供了理论依据。

摘要：目的 基于适老化智能药盒交互失效模式的数据,对智能药盒的交互模式进行优化设计,提升交互体验,有效降低交互差错率。方法 首先,成立改进FMEA专家小组进行系统性人因错误减少和预测方法分析(Systematic Human Error Reduction and Prediction Approach, SHERPA);其次,构建智能药盒交互失误预防模型,然后对适老化智能药盒交互设计进行改进失效模式与效应分析(FailureModeand Effects Analysis, FMEA);最后,针对需要改进的失效模式对智能药盒进行设计优化。结果 实验结果显示“实证对象”存在诸多交互失效模式,对相应交互失效模式进行优化,可有效提升老年人操作智能药盒的交互体验。结论 运用改进FMEA的方法,可以具体量化适老化智能药盒交互失效模式数据,对应失效模式数据的智能药盒交互优化设计,是可行有效的,能够有效降低老年人的用药风险,此方法可为产品交互设计研究提供新的方法路径。

摘要：３－ＳＡＴ问题有一个非常奇妙的相变现象．对于固定的变量数Ｎ，合取范式的可满足概率随着子句个数Ｋ的变化而发生剧烈的变化；当Ｋ≈４．３＊Ｎ时，可满足概率急剧地从１变为０．相变现象决定了问题的难易分布，对于快速求解算法的设计有着非常重要的意义．文章着重讨论了ＳＡＴ问题的更一般形式，即２－３－ＳＡＴ问题的相变现象．研究了相变点处的２－子句和３－子句个数的关系，发现了２－子句和３－子句在约束能力意义下的当量关系。

摘要：针对生产工艺方案设计阶段缺少有效的绿色制造理论和清洁生产技术支持的现状,建立了清洁生产方案设计优化决策模型。提出洁净特征的概念,对生产工艺设计阶段的各种环境信息进行聚合和描述,并提出基于洁净特征的生产工艺方案设计的环境信息表达模型。通过映射函数对环境信息进行识别、筛选、提取和聚合,建立了洁净特征表达模型,并将其作为清洁生产综合评价体系的基本单元,根据评价结果对生产工艺设计方案进行有针对性的选择、改造和完善。以花岗石定型板材的生产过程为例,验证了洁净特征的提取、评价和反馈的可行性。

摘要：利用UG的建模功能和ADAMS的动力学仿真功能建立斜齿轮的动力学模型,通过ADAMS中的IMPACT函数定义齿轮间的接触,通过分析Hertz弹性碰撞理论确定IMPACT函数中的各参数。从获得的分析结果中研究斜齿轮传动的负载情况。利用虚拟样机技术将齿轮传动设计中的问题尽可能的在设计阶段解决,节省经费,缩短设计周期。

摘要：支撑辊液压胀形作为VC轧机独有的辊型调控手段,是控制负载辊缝与板形质量最有效的方法之一。同时,因为VC辊液压胀形作用的存在,过盈力和过盈量的定量计算成为VC轧辊设计和校核的关键。为此,首先通过分析VC轧辊套筒和芯轴热装之后的受力与变形情况,提出了原始过盈量和原始过盈力的计算方法。然后,考虑VC轧辊套筒和芯轴受力对轧辊挠度的影响,根据套筒和芯轴在轧制过程中的变形几何关系,确定了VC轧辊套筒和芯轴的变形协调方程,并结合轧制过程中力平衡与力矩平衡方程,建立了VC轧辊实际过盈力和实际过盈量分布的计算模型。最后,利用国内某VC轧机的轧辊结构参数和实际生产过程中的典型规格带钢工艺参数,定量计算并分析了带钢轧制过程中过盈力和过盈量的分布。进一步在极限油压50 MPa范围内选取9.8、19.6、29.4、39.2、49.0 MPa 5种油压,计算并分析了不同油压对过盈力分布的影响。结果表明,过盈力和过盈量分布的主要影响因素是轧制力和油压,且油压对过盈力和过盈量的影响大于轧制力的影响;油压的升高有效降低了过盈力,且油压的变化对距离油腔边部越近的部位影响越大,反之则影响越小。VC轧辊过盈力及过盈量计算模型的建立为VC轧辊的设计和校核技术提供了理论参考,具有一定的实际应用价值。