Fabrication of barium titanate ceramics via digital light processing 3D printing by using high refractive index monomer

A digital light processing (DLP) technology has been developed for 3D printing lead-free barium titanate (BTO) piezoelectric ceramics. By comparing the curing and rheological properties of slurries with different photosensitive monomer, a high refractive index monomer acryloyl morpholine (ACMO) was chosen, and a design and preparation method of BTO slurry with high solid content, low viscosity and high curing ability was proposed. By further selecting the printing parameters, the single-layer exposure time was reduced and the forming efficiency has been greatly improved. Sintered specimens were obtained after a nitrogen-air double-step debinding and furnace sintering process, and the BTO ceramics fabricated with 80 wt% slurry shows the highest relative density (95.32 %) and piezoelectric constant (168.1 pC/N). Furthermore, complex-structured BTO ceramics were prepared, impregnated by epoxy resin and finally assembly made into hydrophones, which has significance for the future design and manufacture of piezoelectric ceramic-based composites that used in functional devices.     

Facile synthesis of Li 2 ZrO 3 -modified LiNi 0.5 Mn 0.5 O 2 cathode material from a mechanical milling route for lithium-ion batteries

Li2ZrO3-modified LiNi0.5Mn0.5O2 materials with improved electrochemical performance were directly synthesized by a simple mechanical milling route with ZrO2, Li2CO3 and Ni0.5Mn0.5(OH)2 precursors...     

Mesoporous Co–Mn Spinel Oxides as Efficient Catalysts for Low Temperature Propane Oxidation

Catalysis Letters - A series of mesoporous cobalt–manganese catalysts were successfully synthesized by sol–gel method as efficient catalysts for the propane oxidation. A significant...     

基于光纤技术的采空区发火监测系统的应用

基于光纤技术的采空区发火监测系统由传感器、数据传输、数据分析与控制三大部分构成,研发新一代适合煤矿安全领域应用的先进传感器、并以此为基础构建新型煤矿安全灾害监测预警系统,对于实现煤矿安全发展具有十分重要的意义。     

Bamboo biochar-catalytic degradation of lignin under microwave heating

Abstract

Lignin biochar-catalytic depolymerization using biochar Fe-600, Fe-800, Ni-600, Ni-800 catalysts under microwave-heating (180?°C for 30?min) was explored in an ethanol/formic acid (1:1) media. Non-catalyst depolymerization was also studied and compared with the biochar-catalysts results. Characteristics of the bio-char catalysts were analyze by BET, XRD, and FT-IR. GPC, FT-IR, and MALDI-TOF MS spectrometry were also used to characterize the depolymerization products. The experimental results showed that the S_BET, V_t, and V_mec and average pore diameter of the biochars are considerably dependent on the preparation temperature and type of cation (Ni²⁺ or Fe³⁺). The maximum yield of bio-oil product was obtained as 85?wt% with the addition of biochar Ni-600 and the total amount of oligomers or monomers with a molecular weight of 164 to 446 reaches 80.4%.     

一种基于DSP的声学信号采集系统

传统的数据采集器多采用Inte151系列或Inte196系列的CPU，运算能力差，速度慢，精度低，尤其是浮点运算能力限制了技术指标的进一步提高。有鉴于此，各科研单位及数据采集器产家正积极开发新一代的数据采集器。如采用高性能的嵌入式芯片，或带有数字信号处理功能的芯片等。TI公司的TMS320VC33数字信号处理芯片已能支持高达150MFLOPS的运行速度，是需浮点运算的电子产品应用场合中一种较理想的微处理器件。     

BIDPS^＊：基本的循环加深周边搜索算法

ＢＩＤＰＳ＾＊是一种把ＩＤＡ算法和ＰＳ法相结合而产生的人工智能搜索算法。该文研究了不考虑启发式计算最小化技术的搜索效率问题，提出了一些新的算法效率的度量，用８数码难题检验了ＢＩＤＰＳ算法并与ＩＤＡ算法进行了比较分析，实验结果表明尽管ＢＩＤＰＳ启发式计算量较大，但较ＩＤＡ算法在效率上还有所提高的。     

Ultra-strong, well-apodised Bragg gratings in chalcogenide rib waveguides

The first ultra-strong, near-perfect, raised-apodised Bragg gratings in As/sub 2/S/sub 3/ chalcogenide rib waveguides using /spl lambda/=532 nm light and a modified Sagnac holographic writing setup are demonstrated. Good agreement is achieved between the experimental results and the numerical modelling of the gratings using the transfer matrix analysis for thin film structures.