一个简化的积累率优化模型

为了保证国民经济持续稳定的发展，国民收入中必须取出一个部分用于积累。而重要的问题是决定每年的国民收入中应分配多少份额用于积累才能使一个长期内的国民总收入的增量达到最大。本文使用统计模型方法讨论了这个问题，建议了一个简单的统计模型，对我国国民经济的宏观控制，提出了几点供参考的意见。     

递归的核回归模型及其应用

本文我们首先构造了两个递归的回归模型 ,然后将其应用于湖南省城镇居民消费性支出 ,得到了较好的拟合效果     

国民经济中的最优积累率

本文建立数学模型研究国民经济中的最优积累率的问题 ,否定了劳动力按指数增长的假设 ,得到了更加符合实际情况的结论 ,推广了现有文献中的结果 .     

Low-power current-reused RF front-end based on optimized transformers topology

This paper discusses the design, analysis and performance of a 2.4 GHz fully integrated low-power current-reused receiver front-end implemented in 0.18 μm CMOS technology. The front-end is composed of a single-to-differential low-noise amplifier (LNA), using high-Q differential transformers and inductors and a coupled switching mixer stage. The mixer transconductor and LNA share the same DC current. Measurements of performance show a conversion gain of 28.5 dB, noise figure of 6.6 dB, 1 dB compression point of −32.8 dBm and IIP3 of −23.3 dBm at a 250 kHz intermediate frequency, while dissipating 1.45 mA from a 1.2 V supply.     

一种无线连续血氧饱和度监测系统

人体血氧饱和度是医疗行业监测的重要数据,现今有线方式采集血氧饱和度存在通讯距离受限且移动不便,无线方式采集血氧饱和度存在临床数据不准确,且功耗过高。本文对无线连续血氧饱和度监测系统进行了研究,设计了无线低功耗的血氧饱和度监测设备,解决了有线血氧饱和度监测设备存在的问题,同时提高了设备的准确度、抗干扰能力、自适应能力,降低了系统功耗。     

Digitally controlled oscillator design with a variable capacitance XOR gate

A digitally controlled oscillator(DCO) using a three-transistor XOR gate as the variable load has been presented.A delay cell using an inverter and a three-transistor XOR gate as the variable capacitance is also proposed. Three-,five- and seven-stage DCO circuits have been designed using the proposed delay cell.The output frequency is controlled digitally with bits applied to the delay cells.The three-bit DCO shows output frequency and power consumption variation in the range of 3.2486-4.0267 GHz and 0.6121-0.3901 mW,respectively,with a change in the control word 111-000.The five-bit DCO achieves frequency and power of 1.8553-2.3506 GHz and 1.0202-0.6501 mW,respectively,with a change in the control word 11111-00000.Moreover,the seven-bit DCO shows a frequency and power consumption variation of 1.3239-1.6817 GHz and 1.4282-0.9102 mW,respectively, with a varying control word 1111111-0000000.The power consumption and output frequency of the proposed circuits have been compared with earlier reported circuits and the present approaches show significant improvements.     

Low-power CMOS LC QVCO using zero-biased transistor coupling of MWCNT network-based VCO structure

This paper presents design, analysis and implementation of a 2.4 GHz QVCO (Quadrature Voltage Controlled Oscillator), for low-power, low-voltage applications. Cross coupled LC VCO (Inductor–Capacitor Voltage Controlled Oscillator) topology realized using integration of a micro-scaled capacitor and a MWCNT (Multi-Wall Carbon Nano-Tube) network based inductor together with the CMOS circuits is utilized together with MOS transistors as coupling elements to realize QVCO. With the passive coupling achieved from the MOS transistors, power consumption is minimized while maintaining a small chip area. The variable capacitors and the inductors are designed using ANSYS and imported through DAC components in ADS (Advanced Design software). Accurate simulation of the QVCO is performed in the software environments and the results are provided. The measurement results show that the QVCO provides quadrature signals at 2.4 GHz and achieves a phase noise of −130 dBc/Hz 1 MHz away from the carrier frequency. The VCO produces frequency tuning from 2.1 GHz to 2.60 GHz (20.83%) with a control voltage varying from 0 to 0.3 V. It achieves a peak to peak voltage of 0.59 V with an ultra low power consumption of 3.8 mW from a 0.6 V supply voltage. The output power level of the QVCO is −10 dBm, with an improved quality factor of 45. The phase error of the QVCO is measured as 3.1°.     

MSP43013×/114×系列单片机以及在数据采集中的应用

用TI公司的新一代16位Flash型MSP430F13X/14X系列单片机（以下用F13X/14X代替）实现了电池应用超低功耗的数据采集。同时给出了F13X/14X的主要结构、特性、功能和开发方法。     

Low Power BIST by Filtering Non-Detecting Vectors

In this paper, two techniques to reduce the energy and the average power consumption of the system are proposed. They are based on the fact that as the test progresses, the detection efficiency of the pseudo-random vectors decreases very quickly. Many of the pseudo-random vectors will not detect faults in spite of consuming a significant amount of energy from the power supply. In order to prevent this energy consumption, a filtering of the non-detecting vectors and a reseeding strategy are proposed.These techniques are evaluated on the set of ISCAS-85 benchmark circuits. Extensive simulations have been made using the SAIL energy simulator showing that, in large circuits, the energy consumption and the average power savings reach 90.0% with a mean value of 74.2% with the filtering technique, and 97.2% with an average value of 90.9% with the reseeding strategy.     

Two precatalysts for application in asymmetric homogeneous hydrogenation

The title compounds, [(1R,1′R,2R,2′R)‐2,2′‐bis(diphenylphosphanyl)‐1,1′‐dicyclopentane](η⁴‐norbornadiene)rhodium(I) tetrafluoridoborate, [Rh(C₃₄H₃₆P₂)(C₇H₈)]BF₄, (I), and [(1R,1′R,2R,2′R)‐2,2′‐bis(diphenylphosphanyl)‐1,1′‐dicyclopentane][η⁴‐(Z,Z)‐cycloocta‐1,5‐diene]rhodium(I) tetrafluoridoborate dichloromethane monosolvate, [Rh(C₃₄H₃₆P₂)(C₈H₁₂)]BF₄·CH₂Cl₂, (II), are applied as precatalysts in asymmetric homogeneous hydrogenation, e.g. in the reduction of dehydroamino acids, affording excellent enantiomeric excesses [Zhu, Cao, Jiang & Zhang (1997). J. Am. Chem. Soc. 119 , 1799–1800].