摘要：Soil shear strength is an important indicator of engineering design and an essential parameter of soil precision tillage and agricultural machinery and equipment design. Although numerous studies have investigated the characteristics of different soil shear strengths, only a few of these works have paid attention to soils containing considerable quantities of rock fragments. To date, most studies on the effects of rock fragments on the shear strength have paid attention to the role of rock fragments with sizes >2 mm. The effects of rock fragments 2 mm, the presence of rock fragments <2 mm could also change the mechanical properties of soils. Thus, in the present study we evaluated the potential influence of <2 mm rock fragments on soil shear strength via an unconsolidated undrained(UU) triaxial compression test. Our results were as follows:(1) A certain quantity of <2 mm rock fragments presented in purple soils developed from clay rocks; and an appropriate quantity of <2 mm rock fragments could improve the shear strength of soils.(2) The different PSDs of soils containing <2 mm rock fragments mainly caused variations in the internal friction angle of soils.(3) The shear strengths of the two mudstone-developed red-brown and gray-brown purple soils was more sensitive to water than that of the shale-developed coarse-dark purple soil. As the soil water content increased from 9% to 23%, the changes in the cohesion, internal friction angle, shear strength, and the maximum principal stress difference were smaller in the coarse dark purple soil than in the two other soils. We therefore concluded that <2 mm rock fragments in purple soils exerted important effects on soil shear strength. A better understanding of the differences among the shear strength features of purple soils could help improve the design of agricultural machinery and equipment.

摘要：Lorenz systems family unifying Lorenz system, Chen system and L system is a typical chaotic *** this paper, we consider impulsive control Lorenz chaotic systems family with time-varying impulse intervals. Byestablishing an effective tool of a set of inequalities, we analyze the asymptotic stability of impulsive control Lorenzsystems family and obtain some new less conservative conditions. Based on the stability analysis, we design a novelimpulsive controller with time-varying impulse intervals. Illustrative examples are provided to show the feasibility andeffectiveness of our method. The obtained results not only can be used to design impulsive control for Lorenz systemsfamily, but also can be extended to other chaotic systems.

摘要：Recently, it has been demonstrated that memristors can be utilized as logic operations and memory elements. In this paper, we present a novel circuit design for complementary resistive switch（CRS）-based stateful logic operations. The proposed circuit can automatically write the destructive CRS cells back to the original states. In addition, the circuit can be used in massive passive crossbar arrays which can reduce sneak path current greatly. Moreover, the steps for CRS logic operations using our proposed circuit are reduced compared with previous circuit designs. We validate the effectiveness of our scheme through Hspice simulations on the logic circuits.

摘要：水系锌离子电池由于具有安全性高、成本低的特点,在柔性储能领域得到广泛关注.然而,传统柔性水系锌离子电池处于零下温度时,由于其电解质的凝固,电池容量会发生严重衰减.此外,当电池承受大幅度的形变后,其外包装易发生破损,造成电解质中水分的挥发,最终导致器件失效.在本文中,我们开发了一种基于聚丙烯酰胺(PAM)和甘油(Gly)的耐低温、保湿凝胶电解质.PAM和Gly与水分子之间的强氢键作用不仅抑制了凝胶电解质在低温时的凝固,而且限制了电解质中自由水的挥发.基于该电解质的柔性水系锌离子电池在-40℃时仍具有优良的电化学性能,并且无封装的电池在30天后仍保持了初始容量的98%.该工作提供了一种设计水系储能器件用耐低温、保湿凝胶电解质的新思路.

摘要：Self-healing polymers represent a class of materials with built-in capability of rehabilitating damages. The topic has attracted increasingly more attention in the past few years. The on-going research activities clearly indicate that self-healing polymeric materials turn out to be a typical multi-disciplinary area concerning polymer chemistry, organic synthesis, polymer physics, theoretical and experimental mechanics, processing, composites manufacturing, interfacial engineering, etc. The present article briefly reviews the achievements of the groups worldwide, and particularly the work carried out in our own laboratory towards strength recovery for structural applications. To ensure sufficient coverage, thermoplastics and thermosetting polymers, extrinsic and intrinsic self-healing, autonomic and non-autonomic healing approaches are included. Innovative routes that correlate materials chemistry to full capacity restoration are discussed for further development from bioinspired toward biomimetic repair.

摘要：This paper describes a large tuning range low phase noise voltage-controlled ring oscillator （ring VCO） based on a different cascade voltage logic delay cell with current-source load to change the current of output node. The method for optimization is presented. Furthermore, the analysis of performance of the proposed ring VCO is confirmed by the measurement results. The three-stage proposed ring VCO was fabricated in the 180-nm CMOS process of SMIC. The measurement results show that the oscillator frequency of the ring VCO is from 0.77O to 5.286 GHz and the phase noise is 97.93 dBc/Hz at an offset of 1 MHz from 5.268 GHz with a total power of 15.1 mW from a 1.8 V supply while occupying only 0.00175 mm2 of the core die area.

摘要：The radial force is a critical factor to determine the sealing performance of radial lip *** effects of radial force produced by garter spring and interference on the static contact properties and sealing performance of a radial lip seal are investigated by numerical simulations and ***-element analysis and mixed elastohydrodynamic lubrication simulation are *** force,contact width,temperature in the sealing zone,the reverse pumping rate and friction torque are measured.A critical value of interference for a cost-effectively designed radial lip seal is *** force is required to compensate the decrease of the radial force because of the interference and used as a possible way to obtain intelligent control of sealing *** quantitative results gotten in this study could provide guide for the seal design and improvement.

摘要：多模态疗法是结合多种疗法治疗通常复杂而隐蔽的肿瘤组织的最有希望的策略之一.尽管多功能纳米材料已被设计用于构建多模态疗法,但普遍存在的各组成部分之间的不充分协调可能导致协同治疗效果不佳,并妨碍其充分实现临床潜力.在此,受可控“集束炸弹”模型的启发,我们设计了一种智能、生物相容、多功能的纳米工厂系统(PDA@GOx@MnO_(2)-PEG),它封装了多种纳米试剂,以达到对肿瘤组织的高破坏效率.刺激反应性的外层二氧化锰作为“炸弹”的外壳可触发级联催化反应,并与GOx形成一个自给自足的环形催化链.PDA作为一种具有良好蛋白质携带能力的基质,实现了高的GOx负载.同时,其高效的光热转换效率显示了低温(~45℃)进一步提高GOx酶活性的潜力.值得注意的是,内部的GOx就像一个“子炸弹”,通过控制释放来增加肿瘤缺氧部位的积累,并在充足的氧气和低热度的帮助下充分发挥其葡萄糖消耗能力进行饥饿治疗.在这个体系中,各种纳米试剂相互配合,层层推进,充分发挥其威力,形成了一个自给自足的纳米工厂模型,通过协同策略实现了良好的低温光热-饥饿协同治疗.此外,该纳米复合材料表现出三态成像能力,可用于敏感诊断和实时监控治疗.这项研究为设计生物相容性和智能治疗纳米平台提供了新的见解,使精准医疗中的多模式治疗效果最大化.

摘要：In the complex multicore chip system,network on-chip(NoC)is viewed as a kind of system interconnection that can substitute the traditional interconnect networks,which will improve the system performance and communication *** regard to the complex and large scale NoC,simple and efficient routing nodes are the critical factors to achieve low-cost and low-congestion communication *** paper proposes an unbuffered switch architecture and makes detailed analysis of the mechanism of buffer in the switch *** to the simulation results,the S-mesh using the unbuffered switch architecture is better in terms of the optimal performance in message latency than some typical NoC architectures,such as 2D-mesh,Fat-tree,Butterfly,Octagon and so *** synthesis results of design compiler indicate that the unbuffered switch has obvious advantages of achieving cost and operating speed for the chips.

摘要：因可自发响应外部刺激而发生体积溶胀并引起其光学性能变化,胆甾型液晶微粒备受关注并在溶剂传感、防伪图案等方面具有广泛应用.胆甾型液晶微粒在溶剂中呈现中心颜色和刷结构颜色的协同变化.但由于刷结构颜色变化的复杂性,科学家们仅关注胆甾型液晶微粒中心颜色在传感中的应用,尚未有其刷结构颜色变化机理及相关应用的报道,这极大地限制了胆甾型液晶微粒的潜在应用.本文揭示了一种胆甾型液晶微粒的新型传感机理,并结合胆甾型液晶微粒中心颜色变化及刷结构颜色变化,发展了新型的溶剂传感器.与传统系统相比,该传感器提供了更为丰富的传感信息.采用反应性介晶、反应性手性掺杂剂、非反应性液晶分子和光引发剂通过微流控装置制备及光聚合得到了胆甾型液晶微粒.所制备的胆甾型液晶微粒分别在微粒的中心处和刷结构处均呈现丰富的色彩.中心反射颜色的可逆变化归因于分子萃取引起的体积收缩及溶剂溶胀引起的体积膨胀的竞争性效应.而胆甾型液晶微粒刷结构的丰富色彩归因于其在不同溶剂中的双折射效应.本文考察了中心/刷微粒在多达16种溶剂中的协同变色行为,提出了协同颜色变化的机理,并展示了这种变色聚合物微粒在多溶剂传感检测和图案显示中的应用.本文有望为开发具有可设计纳米结构的刺激响应性先进功能材料提供新的见解,拓展其在传感、防伪及图案显示等方面的技术应用.