3D打印贝壳仿生复合材料的拉伸力学行为

采用硬质和软质双组分材料,通过调控两种基体材料的装配夹角,采用光固化3D打印技术制备了不同装配方式的仿贝壳珍珠层复合材料,开展了准静态拉伸实验,结合扫描电镜观察,分析了其拉伸力学性能、断裂及能量耗散机理。研究结果表明,保持胞元边长不变,随着面内装配角度增加,仿贝壳珍珠层复合材料的强度呈线性增加趋势,断裂应变呈线性减小的趋势;随着面外装配角度增大,断裂应变呈线性减小趋势,而强度在面外装配角小于45°时呈增强趋势,超过45°时趋于稳定;面外装配角度为45°时,材料的强度达到最大值。试样在断裂前主要通过硬质材料的拔出、软/硬相界面处微裂纹的生成及微裂纹在扩展过程中的合并和偏转等方式耗散能量。     

利用破坏对称性的超导人造原子制备χ型四比特纠缠态

提出了利用在一维传输线共振器中的破坏对称性的超导人造原子来制备χ型四比特纠缠态的方案. 方案中所用到的Δ型三能级人造原子不同于自然的原子, 它可以产生循环跃迁. 经过适当时间的相互作用和简单的操作, 可以得到想要制备的纠缠态. 由于人造原子的激发态和光子态被绝热消除, 所以该方案对于人造原子的自发辐射和传输线共振器的衰减是鲁棒的.     

A combined low power SAR capacitance-to-digital analog-to-digital converter for multisensory system

A combined successive approximation (SAR) capacitance-to-digital converter (CDC)/analog-to-digital converter (ADC) for biomedical multisensory system is presented in this paper. The two converters have same circuit blocks and can be exchanged by four switches. Capacitance or voltage from different sensing elements can be measured and converted to digital output directly. This single chip takes place of separated CDC and ADC so that the power consumption of the multisensory system is reduced. The asynchronous SAR circuit has low power and small area. A dynamic comparator with zero-static power is adopted. Switches are carefully designed to reduce the non-idealities of the converter. Several techniques, such as bootstrapped switches, bottom-plate sampling, dummy switches are used to improve the performance of the circuit. The CDC/ADC is fabricated in 0.18 μm CMOS process. Measurement results show that the ENOB of this 11 bits converter is 10.15 bits and its FOM is 45 fJ/conversion-step under 200 kHz sampling. The power consumption is 9.4 μW with 1.4 V power supply voltage and the core area is 0.1764 mm².     

非晶硅碳（a-SiC∶H）薄膜光学常数的透射谱表征

报道了一种用透射谱数据分析法计算非晶硅碳薄膜的厚度、折射率、吸收系数和光学带隙等光学常数的方法和程序．这一方法引用有效谐振子模型理论的折射率色散关系，所有公式均为解析表达式，便于进行数据处理，无须专用软件，使用Excel即可完成，适用于多种半导体薄膜材料．将这种方法应用于PECVD方法制备的非晶硅碳（a-SiC∶H）薄膜，对其光学特性进行了分析．     

Synthesis of spinel CuCo2O4 nanoparticles and its application in p-nitrophenol reduction

Journal of Sol-Gel Science and Technology - CuCo2O4 spinel nanoparticles were successfully preparedvia a sol–gel method, which were firstly employed in catalytic reduction of p-nitrophenol to...     

A dual-band reconfigurable direct-conversion receiver RF front-end

6 dBm at 2.2 GHz, and a gain of 18.8 dB and IIP3 of 7.3 dBm at 4.5 GHz. The whole front-end consumes 12 mA current at 1.2 V voltage supply for the LNA and 2.1 mA current at 1.8 V for the mixer, with a die area of 1.2 × 1 mm2.     

A controllable resistor and its applications in pole-zero tracking frequency compensation methods for LDOs

unit-gain compensation ceil and pseudo-ESR (equivalent serial resistor of load capacitor) power stage have been realized by this controllable resistor.Their advantages and limitations are discussed and verified by simulation results.     

A Fast-Settling Wideband-IF ASK Baseband Circuit for a Wireless Endoscope Capsule

A novel automatic-gain-control (AGC) architecture utilizing wideband current feedback is proposed for the baseband circuit of a wireless endoscope capsule. The baseband circuit consists of a fast-settling wideband AGC loop and an amplitude-shift-keying demodulator. Additional integrators in the reverse signal path provide negative feedback, bandpass-filtering effect, attenuating low-frequency noises, and dc offset from the radio-frequency front end. The baseband circuit fabricated in a 180-nm complementary metal-oxide-semiconductor process achieves a wide-intermediate-frequency (IF) carrier frequency in the range of 0.5-40 MHz, a measured settling time of 2 mus, and an input sensitivity of -57 dBm. The entire baseband demodulator dissipates only 5 mA, with a 1.8-V supply at a data rate of 1.37 Mb/s and an IF carrier frequency of 10 MHz.     

Real-time phase-resolved functional optical coherence tomography by use of optical Hilbert transformation

We have developed a novel real-time phase-resolved functional optical coherence tomography system that uses optical Hilbert transformation. When we use a resonant scanner in the reference arm of the interferometer, with an axial scanning speed of 4 kHz, the frame rate of both structural and Doppler blood-flow imaging with a size of 100 by 100 pixels is 10 Hz. The system has high sensitivity and a larger dynamic range for measuring the Doppler frequency shift that is due to moving red blood cells. Real-time images of in vivo blood flow in human skin obtained with this interferometer are presented.