社区服务机器人设计,城市生活的友好伴侣

经历了长期的发展,服务机器人正在经历转变,逐步成为社区服务的一部分,成为人们的生活伴侣。在这一场景下,友好性和可接近性是未来服务机器人设计的主要方向。设计师们开发了一个品牌形象,通过像素风的显示方式实现与用户直观和独特的沟通方式,这款服务机器人被视为友好的终身伴侣,包括儿童在内的任何人都可以与之分享他们的特殊时刻。

Mechanical densification synthesis of single-crystalline Ni-rich cathode for high-energy lithium-ion batteries

The intergranular microcracking in polycrystalline Ni-rich cathode particle is led by anisotropic volume change and stress corrosion along grain boundary,accelerating battery performance decay.Herein,we have suggested a simple but advanced solid-state method that ensures both uniform transition metal distribution and single-crystalline morphology for Ni-rich cathode synthesis without sophisticated coprecipitation.Pelletization-assisted mechanical densification(PAMD)process on solid-state precursor mixture enables the dynamic mass transfer through the increased solid-solid contact area which facilitates the grain growth during sintering process,readily forming micro-sized single-crystalline particle.Furthermore,the improved chemical reactivity by a combination of capillary effect and vacancyassisted diffusion provides homogeneous element distribution within each primary particle.As a result,single-crystalline Ni-rich cathode with PAMD process has eliminated a potential evolution of intergranular cracking,thus achieving superior energy retention capability of 85%over 150 cycles compared to polycrystalline Ni-rich particle even after high-pressure calendering process(corresponding to electrode density of~3.6 g cm^(-3))and high cut-off voltage cycling.This work provides a concrete perspective on developing facile synthetic route of micron-sized single-crystalline Ni-rich cathode materials for high energy density lithium-ion batteries(LIBs).

Elucidating Ion Transport Phenomena in Sulfide/Polymer Composite Electrolytes for Practical Solid-State Batteries

Despite the enormous interest in inorganic/polymer composite solid-state electrolytes(CSEs)for solid-state batteries(SSBs),the underlying ion transport phenomena in CSEs have not yet been elucidated.Here,we address this issue by formulating a mechanistic understanding of bi-percolating ion channels formation and ion conduction across inorganic-polymer electrolyte interfaces in CSEs.A model CSE is composed of argyrodite-type Li_6PS_5Cl(LPSCl)and gel polymer electrolyte(GPE,including Li~+-glyme complex as an ion-conducting medium).The percolation threshold of the LPSCl phase in the CSE strongly depends on the elasticity of the GPE phase.Additionally,manipulating the solvation/desolvation behavior of the Li~+-glyme complex in the GPE facilitates ion conduction across the LPSCl-GPE interface.The resulting scalable CSE(area=8×6(cm×cm),thickness~40μm)can be assembled with a high-mass-loading LiNi_(0.7)Co_(0.15)Mn_(0.15)O_(2)cathode(areal-mass-loading=39 mg cm~(-2))and a graphite anode(negative(N)/positive(P)capacity ratio=1.1)in order to fabricate an SSB full cell with bi-cell configuration.Under this constrained cell condition,the SSB full cell exhibits high volumetric energy density(480 Wh L_(cell)~(-1))and stable cyclability at 25℃,far exceeding the values reported by previous CSE-based SSBs.

Robust Non-Coherent Demodulation Scheme for Bluetooth Voice Transmission Using Linear, Extended, and Unscented Kalman Filtering

This paper presents a novel and cost effective method to be used in the optimization of the Gaussian Frequency Shift Keying (GFSK) at the receiver of the Bluetooth communication system. The proposed method enhances the performance of the noncoherent demodulation schemes by improving the Bit Error Rate (BER) and Frame Error Rate (FER) outcomes. Linear, Extended, and Unscented Kalman Filters are utilized in this technique. A simulation model, using Simulink, has been created to simulate the Bluetooth voice transmission system with the integrated filters. Results have shown improvements in the BER and FER, and that the Unscented Kalman Filters (UKF) have shown superior performance in comparison to the linear Kalman Filter (KF) and the Extended Kalman Filter (EKF). To the best of our knowledge, this research is the first to propose the usage of the UKF in the optimization of the Bluetooth System receivers in the presence of additive white Gaussian noise (AWGN), as well as interferences.

考虑动力系功率损失和CVT响应滞后集成发动机—CVT控制的性能

本文考虑由于 CVT速比变化引起动力系功率损失和惯性转矩推荐了一种集成发动机一无级变速器( CVT)控制算法。此外还提出了减少 CVT速比响应滞后对驱动转矩影响的补偿算法。实验结果表明 ,最佳发动机速度补偿算法给出最佳发动机工作点在最佳工作线附近。当加速度响应接近相等时和最佳转矩补偿比较。建议把集成发动机— CVT控制算法的特点和传统 CVT相比较 。

并联混合电动车辆采用无级变速器速比控制对燃油经济性的改进

考虑到并联混合电动车辆(HEV)动力系响应滞后,建议采用无级变速器(CVT)速比控制方法来实现HEV的燃油经济性的改进。在该方法内,由估算于动力系响应滞后之后根据车辆速度来修正目标CVT速比,并推荐一个加速图谱来估算响应滞后的车辆速度。该CVT速比控制方法采用HEV台架试验机试验证实。根据试验结果,可以看到用修正速比控制方法发动机工作迹线比用常规CVT速比控制对于适度加速模式可以有更有效换档范围,故能给出最佳的燃油经济性。此外,还采用HEV动力系模型对联邦城市驱动计划性能仿真进行估算响应滞后对燃油经济性的影响。仿真结果表明作为响应滞后采用修正CVT速比增大可以实现最佳的燃油经济性。但在实际应用中,要求最佳燃油经济性和加速性能之间进行折衷。

减小一独立压力控制型无级变速器压力波动的研究

本文研究一金属带型独立压力控制无级变速器（CVT）的压力特性，并建议修正降低稳态的压力波动。根据试验，监测辅助压力区在减速比内压力波动。为分析压力特性，求得包含CVT变速器液压控制模型，采用该动力学模型，研究影响压力波动的诸参数。根据仿真，我们发现液体刚度的变化是压力波动的主要原因。基于对刚度的分析，建议修正辅助控制阀供给部分刻痕来减少由辅助控制阀到CVT变速器液体供给管道刚度梯度。根据仿真和试验，采有这种液体刚度修正可以降低压力波动影响。

混联式混合电动车辆最佳动力配置策略

采用一台内燃机和两台电动机组合的混联式混合电动车辆(HEV),具有可控制两混联混合系统功率流的优势。在该系统中,功率流的控制,不仅可调整机械能和电能的大小和方向,同时还可调整发动机的工作点。本研究引用一功率配置策略实现最小的功率流损耗和一个高效的发动机工作点。该策略采用控制图求出最有效的工作点降低计算载荷。此外,一种能量策略,采用建立功率配置的结果,决定蓄电池最佳充/放电功率。这种控制结构组合了功率配置策略和能量策略,确保HEV的有效驱动。进行了一系列的仿真和车辆试验,验证了策略的有效性,结果表明对燃油经济性改进的差异。

Synthesizing core-shell Ni-rich LiNi_(x)Co_(y)Mn_(z)O_(2) from spent Li-ion battery leachate

As the global electric vehicle market continues to grow,the recycling of Li-ion battery (LIB) becomes more important worldwide and the resynthesis of cathode materials would be the most value-added recycling approach taking into account limited metal resources.Although resynthesized homogenous LiNi_(x)Co_(y)Mn_(z)O_(2)(NCM) from spent LIB leachate shows comparable battery performance to pristine NCM from virgin materials,there is general concern in its cycling performance.Here,we synthesize core–shell(CS) Ni-rich NCM,which consists of Ni-rich NCM as the core and NCM derived from the original or purified leachate of spent LIBs as the shell.Resynthesized CS Ni-rich NCM exhibits improved rate capability resulting from expanded interslab thickness in the NCM structure.CS Ni-rich NCM from purified LIB leachate shows improvement in cycling performance and thermal stability.It specifically delivers a capacity retention of 86.6%at a high temperature after 80 cycles compared to that (75.0%) of pristine CS Ni-rich NCM.These improvements are caused by a relatively high Mg content on the shell and the widespread distribution of Al through the CS structure.CS Ni-rich NCM derived from spent LIB leachate provides a new alternative approach to conventional LIB recycling methods,which would utilize efficiently limited metal resources for the sustainable LIB production.