基于软件接收机的GPS信号快速捕获算法

针对GPS信号C/A码的捕获,利用多项式拟合估计多普勒频率偏移值,减少了频率搜索范围;将直接求相关值和利用FFT/IFFT变换的算法相结合,用于确定C/A码相位。且在信号处理上利用抽取避免重复采样。仿真结果表明,该算法在同等的定位精度要求下,降低了计算复杂度,提高了C/A码的捕获速度。     

Ex-post efficient resource allocation for Self-organizing Cloud

Self-organizing Cloud is a scalable model to provide powerful computability with distributed computers. The resource allocation on it is very challenging since it not only involves various types of divisible resources but needs to cope with social competitions. We propose a novel resource allocation scheme with three features on ex-post efficiency. (1) Ex-post win–win effect: each participant (consumers and suppliers) should always feel satisfied with their ex-post payoffs. (2) Incentive compatibility: we can prove each rational participant gets its optimal payoff iff their resource demands and expected prices are truthfully declared. (3) Ex-post maximized efficiency: more powerful resources should be consumed with higher likelihood, such that the whole system runs quite efficiently with maximized resource utilization. Our simulation shows the approach significantly improves resource suppliers’ incomes by 20% compared to their expectations. Meanwhile, we can guarantee consumers’ payments below their budgets, with no any degradation of task execution performance.     

基于自动区域模型的含分布式电源配电网可靠性评估

提出了一种基于含分布式电源的配电块的简化网络可靠性FMEA算法。根据不同开关的功能,以自动开关装置为边界形成自动区域,将含分布式电源的配电网络简化为只含开关、配电块、负荷以及分布式电源的等效网络,每个自动区域仅含一个自动开关和若干个手动开关,由自动区域特性可知:与主区域直接相连的所有支路的负荷点有相同的故障率,且该类负荷点的故障停运时间由系统元件故障位置来确定;与支路区域相连的负荷点的故障率不受主区域的影响,且该类负荷点的故障停运时间由分布式电源所在支路区域的相对位置来确定。基于配电块的故障模式后果分析法,提出了形式化的含分布式电源的配电网络可靠性评估算法。该算法在很大程度上减少了重复枚举的数量,通过RBTS算例分析,证明了该方法的有效性。     

The working mechanism of organic photovoltaic cell by using copper phthalocyanine as exciton blocking layer

We demonstrate the working mechanism of organic photovoltaic (OPV) cell with copper phthalocyanine (CuPc) as exciton blocking layer (EBL). The new EBL material CuPc, commonly has been used as electron donor in the organic solar cells due to its electron-donating and hole-transporting properties. But here we proves that the α-polymorph CuPc layer can transfer electrons to Al cathode through the half-filled b_1g level, this mechanism is different from that of general EBL material with larger band gap and electron-transporting property, which is based on damage states induced by the heat of evaporating Al.     

Preparation of Mo2C by MPCVD and Its Photocatalytic Properties

Mo2C was prepared by microwave plasma chemical vapor deposition(MPCVD)technique with the power of 800 W and pressure of 18 kPa. Compared with traditional prepar...     

Inhibitors of Mitochondrial Human Carbonic Anhydrases VA and VB as a Therapeutic Strategy against Paclitaxel-Induced Neuropathic Pain in Mice

Neuropathy development is a major dose-limiting side effect of anticancer treatments that significantly reduces patient’s quality of life. The inadequate pharmacological approaches for neuropathic pain management warrant the identification of novel therapeutic targets. Mitochondrial dysfunctions that lead to reactive oxygen species (ROS) increase, cytosolic Ca²⁺ imbalance, and lactate acidosis are implicated in neuropathic pain pathogenesis. It has been observed that in these deregulations, a pivotal role is played by the mitochondrial carbonic anhydrases (CA) VA and VB isoforms. Hence, preclinical studies should be conducted to assess the efficacy of two novel selenides bearing benzenesulfonamide moieties, named 5b and 5d, and able to inhibit CA VA and VB against paclitaxel-induced neurotoxicity in mice. Acute treatment with 5b and 5d (30–100 mg/kg, per os – p.o.) determined a dose-dependent and long-lasting anti-hyperalgesic effect in the Cold plate test. Further, repeated daily treatment for 15 days with 100 mg/kg of both compounds (starting the first day of paclitaxel injection) significantly prevented neuropathic pain development without the onset of tolerance to the anti-hyperalgesic effect. In both experiments, acetazolamide (AAZ, 100 mg/kg, p.o.) used as the reference drug was partially active. Moreover, ex vivo analysis demonstrated the efficacy of 5b and 5d repeated treatments in reducing the maladaptive plasticity that occurs to glia cells in the lumbar portion of the spinal cord and in improving mitochondrial functions in the brain and spinal cord that were strongly impaired by paclitaxel-repeated treatment. In this regard, 5b and 5d ameliorated the metabolic activity, as observed by the increase in citrate synthase activity, and preserved an optimal mitochondrial membrane potential (ΔΨ) value, which appeared depolarized in brains from paclitaxel-treated animals. In conclusion, 5b and 5d have therapeutic and protective effects against paclitaxel-induced neuropathy without tolerance development. Moreover, 5b and 5d reduced glial cell activation and mitochondrial dysfunction in the central nervous system, being a promising candidate for the management of neuropathic pain and neurotoxicity evoked by chemotherapeutic drugs.     

Immobilization of Lathyrus cicera Amine Oxidase on Magnetic Microparticles for Biocatalytic Applications

Amine oxidases are enzymes belonging to the class of oxidoreductases that are widespread, from bacteria to humans. The amine oxidase from Lathyrus cicera has recently appeared in the landscape of biocatalysis, showing good potential in the green synthesis of aldehydes. This enzyme catalyzes the oxidative deamination of a wide range of primary amines into the corresponding aldehydes but its use as a biocatalyst is challenging due to the possible inactivation that might occur at high product concentrations. Here, we show that the enzyme’s performance can be greatly improved by immobilization on solid supports. The best results are achieved using amino-functionalized magnetic microparticles: the immobilized enzyme retains its activity, greatly improves its thermostability (4 h at 75 °C), and can be recycled up to 8 times with a set of aromatic ethylamines. After the last reaction cycle, the overall conversion is about 90% for all tested substrates, with an aldehyde production ranging between 100 and 270 mg depending on the substrate used. As a proof concept, one of the aldehydes thus produced was successfully used for the biomimetic synthesis of a non-natural benzylisoquinoline alkaloid.     

Localization-limited exciton oscillator strength in colloidal CdSe nanoplatelets revealed by the optically induced stark effect

2D materials are considered for applications that require strong light-matter interaction because of the apparently giant oscillator strength of the exciton tra...     

原油标准体积管结蜡造成的后果及解决方法

探讨了原油动态计量中标准体积管结蜡所引起的误差、原因分析和经济损失,提出了解决问题的办法。     

冷却工艺对新型高速列车焊接构架用钢组织演变的影响

针对高速列车焊接构架用钢的性能要求,设计了一种低成本的Mn-Cu微合金低碳钢,并对该实验钢的连续冷却转变规律以及冷却工艺对组织演变的影响进行了研究.结果表明,实验钢在较宽的冷速范围(1～30℃/s)内均可以获得先共析铁素体和中温相变组织.冷却速度和卷取温度对最终组织形态和细化有着重要影响,轧制结束后立即加速冷却至500～600℃,再缓冷,可以获得以细小准多边形铁素体、针状铁素体和粒状贝氏体为主的混合组织.经实验室控轧控冷验证了具有该组织形态的12 mm中厚钢板屈服强度可达540 MPa,同时拥有良好的塑性和低温韧性.