摘要：The pump performance parameters,such as pump pressure,plunger friction and pump valve resistance,are fundamental parameters of optimal design of pump efficiency and sucker rod pumping system (SRPS).In this paper,considering the characteristic of geometrical nonlinear and rheology property of multiphase fluid,the pump performance parameters are ***,a dynamics model of annular fluid flow is *** the detail,a partial differential equation of annular fluid is established and a computing model of fluid pressure gradient is ***,the simulation models of plunger friction and hydraulic resistance of pump valve are ***,a novel simulation method of fluid pressure in annular space is proposed with software *** order to check up the correction of models proposed in this paper,the comparison curves of experiment and simulation results are *** on above model,the whole simulation model of plunger pump is simulated with Visual Basic *** results show that the fluid friction of pump plunger and instantaneous resistance of pump valve are *** impact factors of pump performance parameters are analyzed,and their characteristic curves are given,which can help to optimize the pump motion parameters and pump structural.

摘要：A combination of hydrogels and microfluidics allows the construction of biomimetic three-dimensional(3D)tissue models in vitro,which are also known as *** hydrogel patterningwith awell-controlled spatial distribution is typically achieved by embedding sophisticated microstructures to act as a ***,these physical barriers inevitably expose cells/tissues to a less physiologically relevant microenvironment than in vivo ***,we present a novel dissolvable temporary barrier(DTB)strategy that allows robust and flexible hydrogel patterning with great freedom of design and desirable flow stimuli for cellular *** key aspect of this approach is the patterning of a water-soluble rigid barrier as a guiding path for the hydrogel using stencil printing technology,followed by a barrier-free medium perfusion after the dissolution of the *** and multiple tissue compartments with different geometries can be established using either straight or curved DTB *** effectiveness of this strategy is further validated by generating a 3D vascular network through vasculogenesis and angiogenesis using a vascularized microtumor *** a new proof-of-concept in vasculature-on-a-chip,DTB enables seamless contact between the hydrogel and the culture medium in closed microdevices,which is an improved protocol for the fabrication ofmultiorgan ***,we expect it to serve as a promising paradigm for organ-on-a-chip devices for the development of tumor vascularization and drug evaluation in the future preclinical studies.

摘要：Cortical electrodes are a powerful tool for the stimulation and/or recording of electrical activity in the nervous ***,the inevitable wound caused by surgical implantation of electrodes presents bacterial infection and inflammatory reaction risks associated with foreign body ***,inflammation of the wound area can dramatically worsen in response to bacterial *** consequences can not only lead to the failure of cortical electrode implantation but also threaten the lives of ***,we prepared a hydrogel made of bacterial cellulose(BC),a flexible substrate for cortical electrodes,and further loaded antibiotic tetracycline(TC)and the anti-inflammatory drug dexamethasone(DEX)onto *** encapsulated drugs can be released from the BC hydrogel and effectively inhibit the growth of Gram-negative and Gram-positive ***,therapeutic cortical electrodes were developed by integrating the drug-loaded BC hydrogel and nine-channel serpentine arrays;these were used to record electrocorticography(ECoG)signals in a rat *** to the controlled release of TC and DEX from the BC hydrogel substrate,therapeutic cortical electrodes can alleviate or prevent symptoms associated with the bacterial infection and inflammation of brain *** approach facilitates the development of drug delivery electrodes for resolving complications caused by implantable electrodes.

摘要：The application of thermoelectric devices(TEDs)for personalized thermoregulation is attractive for saving energy while balancing the quality of *** that directly attach to human skin remarkably minimized the energy wasted for cooling the entire ***,facing the extreme dynamic geometry change and strain of human skin,conventional TEDs cannot align with the contour of our bodies for the best thermoregulation ***,we designed a kirigami-based wearable TED with excellent water vapor permeability,flexibility,and *** analysis and experimental results reveal that our product can withstand various types of large mechanical deformation without circuit *** stated outcome and proposed facile approach not only reinforce the development of wearable TEDs but also offer an innovative opportunity for different electronics that require high conformability.

摘要：Coal gasification fine slag(FS)is a typical solid waste generated in coal *** current disposal methods of stockpil-ing and landfilling have caused serious soil and ecological *** recovery and the high-value utilization of residual carbon(RC)in FS are the keys to realizing the win-win situation of the coal chemical industry in terms of economic and environmental *** structural properties,such as pore,surface functional group,and microcrystalline structures,of RC in FS(FS-RC)not only affect the flotation recovery efficiency of FS-RC but also form the basis for the high-value utilization of *** this paper,the characteristics of FS-RC in terms of pore structure,surface functional groups,and microcrystalline structure are sorted out in accordance with gasification type and FS particle *** reasons for the formation of the special structural properties of FS-RC are analyzed,and their influence on the flotation separation and high-value utilization of FS-RC is *** methods based on the pore structural characterist-ics of FS-RC,such as ultrasonic pretreatment-pore-blocking flotation and pore breaking-flocculation flotation,are proposed to be the key development technologies for improving FS-RC recovery in the *** design of low-cost,low-dose collectors containing polar bonds based on the surface and microcrystalline structures of FS-RC is proposed to be an important breakthrough point for strengthening the flotation efficiency of FS-RC in the *** high-value utilization of FS should be based on the physicochemical structural proper-ties of FS-RC and should focus on the environmental impact of hazardous elements and the recyclability of chemical waste liquid to es-tablish an environmentally friendly utilization *** review is of great theoretical importance for the comprehensive understand-ing of the unique structural properties of FS-RC,the breakthrough of the technological bottleneck in the e

摘要：设计赋能文化传承的背景下,文化创意产品地域文化转译的同质化、传播力的疲软化制约了文化传承。本研究以湘赣边区红色文化创意产品设计为例,提出文化创意产品适应性开发方法,即凸显湘赣边区的红色文化,精准文化转译;匹配红色旅游群体的差异化需求,提升文化传播力。首先,以大学生群体为研究对象,依据用户消费类别偏好量表和产品需求特征量表探测用户需求。然后,解析湘赣边区红色文化基因,指导产品设计实践。最后,从设计层、功能层、文化层对设计产品展开后期评估,实证文化创意产品适应性开发方法的可行性。研究结果表明,湘赣边区红色文化创意产品的适应性开发方法能够辅助设计师的设计决策。

摘要：This paper investigates the related factors of Chinese learning engagement and performance of 377 students from three universities in Guangzhou of China,employs the value engineering method,and calculates the value coefficient of learning *** the value coefficient of Chinese language learning,it proves that over 60%of international students studying in China have a higher efficiency in learning Chinese.

摘要：目的基于包容共创理念,探索创意城市家具设计介入城市空间的设计策略,提升城市空间的包容性和多样性,解决居民在公共空间休息娱乐时“没地方坐”“坐不下来”“不愿意坐”或“坐不出情趣”等现实问题。方法阐释微创新、包容共创与城市家具的内涵及关系,结合社区更新原则和包容共创设计提出创意城市家具共创设计策略。通过上海市奉浦街道家具设计案例研究及相关设计实践案例来印证其效用,并探讨创意城市家具在社区更新过程中的作用与研究路径。结果城市家具创新设计优化城市空间,提升居民生活品质,可以从情感疗愈、协同共创、模块组合、商业赋能、地域适应和智慧交互等设计方向,对创意城市家具设计路径进行探索实践。结论城市家具设计只有坚持“以人为本”、因地制宜、因需设计的包容共创发展模式,才能引导城市家具的人性化设计及城市空间治理,真正地从人民共建走向人民共享,提高城市家具的包容性、交互性、娱乐性和可持续性,达成具有关怀温度的参与型城市发展范式。

摘要：随着国家“双减”政策的落地,艺术“新课标”的出台,中国中小学艺术教育呈现新的变革趋向。本文选取五个不同地域的学校,以教师、家长和学生分别为调查对象,从师资建设、教材建设、课程建设、学业评价四重维度对当下中国中小学艺术教育的发展进程进行全方位透视,为中国中小学艺术教育改革提供可资参照的实证报告。

摘要：本文梳理了清代职贡图像的演绎脉络,探究以《皇清职贡图》和《万国来朝图》为代表的两类职贡图之间的发展演变,阐明《皇清职贡图》的创作动机为纪实需求,《万国来朝图》是为了表达吉祥寓意和宣扬教化,创作目的差异导致两图表现方式的变化。两图又相辅相成,共同展现清代中叶的盛世图景。