Preparation and Characterization of Hydrophobic Bagasse Hemicellulose-based Films

To improve the hydrophobicity of bagasse hemicellulose-based films, glutaraldehyde was applied when preparing films of original and cationic bagasse hemicellulose with the addition of polyvinyl alcohol and sorbitol. The results showed that the cationic modification could increase the hydrophobicity of the hemicellulose-based film, and the hydrophobicity of hemicellulose-based films crosslinked with glutaraldehyde also increased. However, cationic modification of hemicellulose decreased the stress of the hemicellulose-based film. While crosslinking with glutaraldehyde increased the stress of both the original and cationic hemicellulose-based films. Macrophotography indicated that the film formability of the original hemicellulose was better than that of cationic hemicellulose. Through SEM observation, the degree of bonding of different components of the films was found to be increased due to crosslinking with glutaraldehyde. The crosslinking reaction between glutaraldehyde and hemicellulose was further confirmed by FT-IR spectroscopy.     

生活垃圾焚烧炉渣水稳定性试验研究

以福州红庙岭生活垃圾焚烧炉渣为试验对象,测试不同吸水时间和干湿循环次数下炉渣试件无侧限抗压强度和CBR的变化规律,揭示炉渣填料在水作用下的强度变化特征。结果表明:炉渣试件无侧限抗压强度和CBR随吸水时间和干湿循环次数的增加而增大,具有良好的水稳定性。炉渣的强度主要依靠水泥熟料和活性物质化学反应产生水化产物形成的,这使得炉渣在潮湿路基的回填、管槽周边的回填具有显著优势。     

Bioinspired interactive neuromorphic devices

The performance of conventional computer based on von Neumann architecture is limited due to the physical separation of memory and processor. By synergistically integrating various sensors with synaptic devices, recently emerging interactive neuromorphic devices can directly sense/store/process various stimuli information from external environments and implement functions of perception, learning, memory, and computation. In this review, we present the basic model of bioinspired interactive neuromorphic devices and discuss the performance metrics. Next, we summarize the recent progress and development of bioinspired interactive neuromorphic devices, which are classified into neuromorphic tactile systems, visual systems, auditory systems, and multisensory system. They are discussed in detail from the aspects of materials, device architectures, operating mechanisms, synaptic plasticity, and potential applications. Additionally, the bioinspired interactive neuromorphic devices that can fuse multiple/mixed sensing signals are proposed to address more realistic and sophisticated problems. Finally, we discuss the pros and cons regarding to the computing neurons and integrating sensory neurons and deliver the perspectives on interactive neuromorphic devices at the material, device, network, and system levels. It is believed the neuromorphic devices can provide promising solutions to next generation of interactive sensation/memory/computation toward the development of multimodal, low-power, and large-scale intelligent systems endowed with neuromorphic features.     

议“亚安全区”在城市商业综合体的应用

以某城市商业综合体为例,探讨设定城市商业综合体的室内步行街为"亚安全区"的问题,定量分析室内步行街的火灾危险性,分析精品店火灾对相邻店铺及相对店铺热辐射的影响,并对烟气控制及人员疏散进行模拟,对城市商业综合体的室内步行街消防安全性进行评估。     

面向新型配电网的能观性分析与精细化协同规划方法

现代控制理论和电力系统状态估计中的能观性定义难以满足配电网态势感知的需求,配电网规划模型中也缺乏对能观指标的考虑,为此,提出面向新型配电网的能观性分析与精细化协同规划方法。对配电网的变量与状态空间模型进行定义,并根据传统能观性定义对配电网中的传统/新型变量进行能观性分析;基于传统能观性定义的缺陷提出新的配电网能观性和能观指标定义,并建立考虑能观性的配电网精细化协同规划模型。算例分析结果表明,所提规划方法考虑了实际量测误差的影响,实现了一次网架规划和二次态势感知设备配置的综合最优,达到了经济性和能观性的平衡。     

Thermodynamic assessments of the Al–Th and Th–Zn systems

The phase diagrams of the Al–Th and Th–Zn systems have been evaluated by using the Calculation of Phase Diagrams (CALPHAD) method with the experimental data including the phase equilibria and thermodynamic properties. The Gibbs free energies of the liquid, bcc and hcp phases were described by the subregular solution model with the Redlich–Kister equation, and those of the stoichiometric compounds of the Th₂Al, Th₃Al₂, ThAl, Th₂Al₃, ThAl₂, ThAl₃, Th₂Al₇, Th₂Zn, ThZn₂, ThZn₄ and Th₂Zn₁₇ were described by the two-sublattice model. The calculated phase equilibria and thermodynamic properties are in good agreement with the experimental data.     

三聚氰胺聚磷酸盐-双季戊四醇发泡体系在水性钢构防火涂料中的应用

使用三聚氰胺聚磷酸盐(MPP)-双季戊四醇(DPER)发泡体系(M-D体系)取代聚磷酸铵(APP)-三聚氰胺(MEL)-季戊四醇(PER)体系(A-M-P体系)制备了水性钢构防火涂料。讨论了MPP/DPER质量比、基料用量、基料配比对涂层初期耐火性及耐浸出性能的影响,对比了M-D体系水性防火涂料与A-M-P体系水性及溶剂型防火涂料的耐浸出性及浸泡后耐火性能可持续性。结果表明:M-D体系展现出与聚合物较好的相容性和较强的疏水性,由其所制备的涂层具有较好的抗溶失性,长期浸泡后涂层仍具备优异的耐火性能可持续性,适宜在户外或较为潮湿的地下结构和隧道等有长期耐水需求的钢结构保护场合中使用。     

Periodic event-triggered secure consensus for networked mechanical systems under Denial-of-Service attacks

This paper concentrates on the secure consensus problem of networked mechanical/Euler–Lagrange systems. First, a new periodic event-triggered (PET) secure distributed observer is proposed to estimate the leader information. The proposed distributed observer only relies on the PET data from its neighbors, which can significantly reduce the communication and computational burden. More importantly, it is secure in the sense that it can work normally regardless of the Denial-of-Service (DoS) attacks. Second, based on the proposed distributed observer, an adaptive fuzzy control law is proposed for each Euler– Lagrange system. A PET mechanism is integrated into the controller, which can reduce the control update. This is helpful for both energy saving and fault tolerance of actuators. Moreover, the PET mechanism naturally makes the controller easy to be implemented in digital platform. The property of fuzzy logic systems and Gronwall inequality are skillfully utilized to show the stability of the closed-loop system. Finally, the proposed control scheme is verified on real Euler–Lagrange systems, which contain a robot manipulator and several servo motors.     

Very facile fabrication of aligned organic nanowires based high-performance top-gate transistors on flexible,transparent substrate

Aligned single-crystalline organic nanowires (NWs) show promising applications in flexible and stretchable electronics, while the use of pre-existing aligned techniques and well-developed photolithography techniques are impeded by the large incompatibility with organic materials and flexible substrates. In this work, aligned copper phthalocyanine (CuPc) organic NWs were grown on flexible and transparent poly(dimethylsiloxane) (PDMS) substrate via a grating-assisted growth approach. Furthermore, a simple yet efficient etching-assisted transfer printing (ETP) method was used to achieve CuPc NW array-based flexible top-gate organic field-effect transistors (OFETs) with a high mobility up to 2.0 cm² V⁻¹ s⁻¹, a small operating voltage within ±10 V, a high on/off ratio >10⁴, and excellent bend stability with bending radius down to 3 mm. It is expected that the high-performance organic NW array-based top-gate OFETs with exceeding bend stability will have important applications in future flexible electronics.     

Ethene/styrene-copolymerizations with [Me2C(3-RCp)(Flu)]ZrCl2/MAO (R=H,Me,tertBu,cHex, Ph)

Two new C₁-symmetric zirconocenes of the type [Me₂C(3-RCp)(Flu)]ZrCl₂ bearing a phenyl (Ph) or a cyclohexyl (cHex) substituent on the cyclopentadienyl ring were synthesized. Copolymerizations of ethene and styrene were carried out using these catalysts and compared to the results obtained with the methyl- and ^tertbutyl-substituted as well as with the unsubstituted system. By the introduction of the phenyl substituent both the activities and the molar masses could be increased whilst the styrene incorporation was comparable to that achieved with the unsubstituted system. In the case of the alkyl substituted systems (R=Me, ^tertBu, cHex) the styrene incorporation is decreased drastically and molar masses and activities are also strongly effected.