Compressive sensing based multiuser detector for massive MBM MIMO uplink

Media based modulation(MBM)is expected to be a prominent modulation scheme,which has access to the high data rate by using radio frequency(RF)mirrors and fewer transmit antennas.Associated with multiuser multiple input multiple output(MIMO),the MBM scheme achieves better performance than other conventional multiuser MIMO schemes.In this paper,the massive MIMO uplink is considered and a conjunctive MBM transmission scheme for each user is employed.This conjunctive MBM transmission scheme gathers aggregate MBM signals in multiple continuous time slots,which exploits the structured sparsity of these aggregate MBM signals.Under this kind of scenario,a multiuser detector with low complexity based on the compressive sensing(CS)theory to gain better detection performance is proposed.This detector is developed from the greedy sparse recovery technique compressive sampling matching pursuit(CoSaMP)and exploits not only the inherently distributed sparsity of MBM signals but also the structured sparsity of multiple aggregate MBM signals.By exploiting these sparsity,the proposed CoSaMP based multiuser detector achieves reliable detection with low complexity.Simulation results demonstrate that the proposed CoSaMP based multiuser detector achieves better detection performance compared with the conventional methods.     

利用Laplace变换的分布阶微分方程数值解法

提出一种基于Laplace变换的求解分布阶微分方程的数值解法.首先,使用一种隐式梯形规则来离散化分布阶FDE积分为一个求和等式,即将分布阶FDE转化为多项式FDE.然后,基于Riemann-Liouville和Caputo分数阶导数的Laplace变换原理,对积分区间离散化后产生的多项式FDE进行求解.实例结果表明,该方法能够求解分布阶FDE,且具有较好的收敛性和准确性.     

光子探测器在芬兰HIP和克罗地亚RBI的研发制作

该文描述了碲化镉（CdTe）探测器，硅漂移探测器和外加一层转换闪烁体硅探测器（SiS）的设计与制作方法这些硅及CdTe芯片制作工艺及其连接方法是在芬兰的Micronova中心完成的与硅工艺不同的是，CdTe工艺必须在低于150 ℃的温度下完成我们因此专门为CdTe探测器开发了一种低温原子层淀积的氧化铝（Al2O3）薄膜工艺，大小为(10×10×1) mm3的CdTe晶圆由一种无接触的光刻工艺完成.探测器性能是由电流 电压（I V），电容 电压（C V）、瞬间电流方法和精确微质子数方法来检测的实验结果与具有材料和缺陷参数的TCAD模拟结果相符     

Tussah Silk Fibroin Porous Scaffolds Prepared with a Mild Self-assembly Process for Controlled Drug Release

Besides excellent biodegradability and biocompatibility,a useful tissue engineering scaffold should provide favorable surface properties,outstanding mechanical strength and controlled drug release property. In this paper,a mild process to prepare porous tussah silk fibroin（ TSF） scaffolds from aqueous solution was described. The n-butanol was used to control the self-assembly of tussah silk. The scaffolds with different TSF concentrations and the same volume showed differences in pore size and distribution. The maximum porosity of the poprepared porous scaffolds was 80% in this paper. And the pore size of the prepared porous scaffolds with different concentrations was between 10μm and 230 μm. X-ray diffraction（ XRD） analysis revealed that amorphous TSF was crystallized to β-sheet secondary structure upon gelatin. The TSF scaffolds for controlled drug release was studied and the result showed that the time of drug release was significantly longer. The produced TSF scaffolds with sustained drug release have potential application in tissue engineering.     

GLP-1R agonists therapy for type 2 diabetes

Glucagon-like peptide-1 receptor （GLP-1R） agonists are widely used for treating type 2 diabetes mellitus （T2DM） be- cause of their glucose-lowering and weight-losing effects, and low risk of hypoglycemia. Hence, there is considerable interest in understanding the mechanism underlying the beneficial effects of GLP-I and developing stable and effective GLP-1R agonists. Here, we summarize the presently known mechanism of GLP-I actions, which are mainly through regulating cAMP-PKA signaling pathway; the latest developments in novel clinical GLP-1R agonists are also introduced, which are characterized with multiple properties, such as extended half-life, reduced side-effects, lower production costs and more convenient drug dosing mode. The potential risk of GLP-I-based therapeutics, an often-ignored fact, is also discussed.     

基于树状分子及炭黑复合纳米材料修饰电极的Cr(VI)电化学检测

用树状分子及炭黑纳米复合材料修饰玻碳电极,并对六价铬Cr(VI)进行电化学测定.采用X射线光电子能谱(XPS)、循环伏安法(CV)、交流阻抗法(EIS)、方波溶出伏安法(SWSV)等方法对修饰电极进行了表征.研究发现多种其他离子如Ni~(2+)、Co~(2+)、Pb~(2+)、Cu~(2+)、Cd~(2+)、NO_3~-、SO_4~(2-)、Cl~-等对六价铬离子的测定没有明显干扰,且Cr(VI)的还原峰电流与Cr(VI)的物质的量浓度在4~60 nmol/L和0.06~500μmol/L范围内呈线性关系,检测限达1 nmol/L.该法具有简便快速,选择性好,线性范围宽,灵敏度高等优点.     

气体扩散层亲疏水特性对流体分布的预测

采用伪势两相格子玻尔兹曼方法（LBM）研究了非增湿条件下碳纸和碳布气体扩散层（GDL）的流体流动状态。通过随机方法和X射线扫描法构建了气体扩散层样本。为确保模型中表面张力和接触角计算的准确性，采用玻璃微珠模型进行验证，随后通过调整气体扩散层的亲疏水特性，分析流体在气体扩散层中流动的实时状态，得到了亲疏水特性对孔隙结构内水饱和度的影响规律。结果表明：疏水性气体扩散层中的水分布与亲水性气体扩散层中的水分布明显不同，较大的疏水性更有利于气体扩散层内水的排出；疏水性更强的气体扩散层显著提高了液态水进入气体扩散层的入口压力，导致催化剂层（CL）更容易受到水渗透的影响。     

壳聚糖—纳米金自组装葡萄糖生物传感器的研究

利用壳聚糖与纳米金构建一种新型的葡萄糖生物传感器。探究不同浓度的葡萄糖溶液、p H及温度对传感器响应电流的影响。结果表明,此传感器在温度为35.0℃,p H=7.00,葡萄糖质量浓度为0.018~25.7 mg/L范围内有良好的线性,线性I=4.135 6 m+91.787μA,R2=0.997 9,检出限为0.001 2 mg/L。该传感器具有制备简单、方法简便、灵敏度高,能快速检测等优点。     

Global Value Chain Embeddedness,Knowledge Spillovers,and Clustered Firms＆#39; Innovation Performance

Empirical evidence of the effects of global value chain （GVC） embeddedness on clustered firms＇ innovation is presented in this paper. The intermediary roles of the two types of knowledge spillover （ explicit and implicit） in GVC embeddedness and clustered firms＇ innovation are considered, and the effects of structure embeddedness, relationship embeddedness, and acknowledgement embeddedness on clustered firms＇ innovation are examined. Analysis is based on the sample of 134 export-oriented firms from the Shaoxing industrial duster in Zhejiang province of China. Results show that although GVC embeddedness is associated with high use of external knowledge sources, clustered firms＇ innovation is promoted indirectly through explicit knowledge spillover. Intrinsic connections exist among the different dimensions of GVC embeddedness, that is, structure embeddedness not only directly improves relationship embeddedness but also indirectly improves acknowledgement embeddedness through relationship embeddedness.     

酸碱法提取黄粉虫中壳聚糖的要点

该文主要介绍了以黄粉虫粉为原料，研究了酸碱法提取壳聚糖的技术要点。结果表明：盐酸浓度，脱盐氢氧化钠溶度及脱乙酰基氢氧化钠浓度和处理时间对壳聚糖的提取有较大的影响，并得出了最佳的工艺条件，为工业生产壳聚糖提供依据。