摘要：We present a design of an acoustic levitator consisting of three pairs of opposite transducer *** orthogonal standing waves create a large number of acoustic traps at which the particles are levitated in *** changing the phase difference of transducer arrays,three-dimensional manipulation of particles is successfully ***,the relationship between the translation of particles and the phase difference is experimentally investigated,and the result is in agreement with the theoretical *** design can expand the application of acoustic levitation in many fields,such as biomedicine,ultrasonic motor and new materials processing.

摘要：Hybrids,produced by hybridization of proteins,peptides,DNA,and other new biomolecules with polymers,often have unique functional *** properties,such as biocompatibility,stability and specificity,lead to various smart *** review mainly introduces biomolecule polymer hybrid materials by reversible deactivation radical polymerization(RDRP),emphasizing reverse addition-fragmentation chain transfer(RAFT)polymerization,and nitroxide mediated polymerization(NMP).It includes the methods of RDRP to improve the biocompatibility of biomedical materials and organisms by surface *** key to the current synthesis of biomolecule polymer hybrids is to control ***,this review describes several different kinds of biomolecule polymer hybrid materials and their applications in the biomedical *** progresses provide ideas for the investigation of biodegradable and highly bioactive biomedical soft tissue *** research hotspots of nanotechnology in biomedical fields are controlled drug release materials and gene therapy carrier *** showed that RDRP method could improve the therapeutic effect and reduce the dosage and side effects of the ***,by means of RDRP,the original materials can be modified to develop intelligent polymer materials as membrane materials with selective permeability and surface modification.

摘要：设计了一套空气-活性炭的声发射信号检测装置,结合经典声发射理论与现代信息处理技术,对气固两相流过程中固相的质量流率、粒径以及碰撞速度等因素做细致分析。对4.00,2.80,1.18,085,0.43 mm 5种不同粒径的活性炭颗粒分别在不同质量流率、不同碰撞速度下的声发射信号进行采样,并采用功率谱估计算法对其进行分析。实验发现碰撞速度对信号的频率影响较小,但对信号的功率强度影响较大,此外,功率谱估计的频率、面积与固相颗粒的粒径、质量流率有很好相关性,拟合出二者的相关方程并通过试验验证,得到各参数的相对误差小于5.5%。因此,采用声发射测量技术与功率谱估计相结合的方法对于气固两项流相关参数的检测是可行有效的。

摘要：为实现高功率密度型机器人无线电能传输(WPT)系统,最为有效的方式为初级直流变换器的小型化设计,这使得该变换器具有开关频率高、动态响应速度快等特点,从而导致系统控制延迟会对变换器的稳定性造成较大影响。为此,本文以双管正激变换器为研究对象,首先根据小信号建模法建立控制延迟模型,其次分析其对系统稳定性的影响,并采用多重采样法降低控制延迟。最后通过仿真与实验验证理论分析的正确性及多重采样法的有效性,为机器人WPT系统初级直流变换器稳定性设计提供一定的方法指导。

摘要：随着气象业务数据量的日益膨胀,海量数据存储已成为了各气象台站迫切需要解决的问题,同时存储设备出现物理故障后数据的丢失,也常常给气象保障业务带来巨大的损失。为此,文中设计了基于P2P的存储系统的整体构架,通过对完全副本和纠删码两种冗余方式的比较,确定了采用基于Reed-Solomon算法的数据冗余方案,并提出了基于节点可靠性的分层数据存储策略,将一部分数据编码存储在可靠度相对较高的节点上,保证了数据的高可靠性。由于采用P2P技术,系统具有很好的扩展性,相同构架和方法可以复制到其他台站。

摘要：A series of hydrazine and oxadiazole analogs of Sorafenib was designed, synthesized and characterized by proton nuclear magnetic resonance（1H NMR） spectrometry and high resolution mass spectrometry（HRMS）. The anti-proliferative activities of these compounds against human colorectal earcinoma（HCT-116） and human breast cancer （MDA-MB-231） tumor cell lines were evaluated in vitro by MTT method[MTT=3-（4,5-dimethylthiazol-2-yl）-2,5- diphenyltetrazolium bromide]. The bioassay results suggest that most of the synthesized compounds have antitumor potential to HCT-116 cell line compared with MDA-MB-231 cell line. Compounds 8a, 8b, 8d, Be, 9f and 9j competitive with Sorafenib demonstrated antiproliferative activities on HCT-116 cell line.

摘要：In order to improve the super-resolution reconstruction effect of the single image, a novel multiple dictionaries learning via support vector regression(SVR) and improved iterative back-projection(IBP) are *** characterize the image structure, the low-frequency dictionary is constructed from the normalized brightness of low-frequency image patches in a discrete-cosine-transform(DCT) *** determined by Gaussian weighting are added to the input vector to restore more high-frequency information when training the high-frequency image patch dictionary in the space *** post-processing, the improved IBP is employed to reduce regression errors each *** results show that the peak signal-to-noise ratio(PSNR)and structural similarity(SSIM) of the proposed method are enhanced by 1.6%—5.5% and 1.5%—13.1% compared with those of bicubic interpolation, and the proposed method visually outperforms several algorithms.

摘要：目的根据DNA旋转酶B亚基(gyrB)基因设计特异性的引物探针,建立一种能够快速准确鉴定阪崎克罗诺杆菌的实时荧光定量聚合酶链式反应(polymerase chain reaction,PCR)方法。方法寻找并在美国国家生物技术信息中心(National Center for Biotechnology Information,NCBI)中下载目标基因序列,使用DNAMAN进行序列比对,Primer Express软件设计引物探针。通过特异性实验、绝对灵敏度、相对灵敏性实验、抗干扰实验对所建立方法进行方法验证。选择本实验室保存的36种40株食品中常见致病菌的标准菌株进行特异性验证。结果多维度特异性验证实验结果显示该方法能够特异性地检测出阪崎克罗诺杆菌,对亲缘关系较近的其他克罗诺杆菌及食品中较为常见的致病菌均无非特异性扩增。DNA检测灵敏度可以达到0.0100 ng/μL,相对灵敏度可以达到10^(3) CFU/mL。抗干扰实验结果显示,将干扰菌和干扰菌DNA分别与阪崎克罗诺杆菌和阪崎克罗诺杆菌DNA进行混合检测,对检测结果无显著影响,说明该方法抗干扰能力良好。结论本研究所设计的引物探针在实时荧光PCR方法下对食品样品中阪崎克罗诺杆菌的检测具有特异、快速、敏感和抗干扰的特点,可为以后食品中阪崎克罗诺杆菌的检测提供技术支撑。

摘要：Random dynamic responses caused by the uncertainty of structural parameters of the coupled train-ballasted track-subgrade system under train loading can pose safety concerns to the train *** paper introduced a computational model for analyzing probabilistic dynamic responses of three-dimensional(3D)coupled train-ballasted track-subgrade system(TBTSS),where the coupling effects of uncertain rail irregularities,stiffness and damping properties of ballast and subgrade layers were simultaneously *** number theoretical method(NTM)was employed to design discrete points for the multi-dimensional stochastic *** time-histories of stochastic dynamic vibrations of the TBSS with systematically uncertain structural parameters were calculated accurately and efficiently by employing the probability density evolution method(PDEM).The model-predicted results were consistent with those by the Monte Carlo simulation method.A sensitivity study was performed to assess the relative importance of those uncertain structural parameters,based on which a case study was presented to explore the stochastic probability evolution mechanism of such train-ballasted track-subgrade system.

摘要：随着全球气候变化议题日益凸显,产品碳足迹的量化评估已成为衡量企业环境责任及驱动绿色转型的关键工具。近期,中国发布的GB/T 24067—2024《温室气体产品碳足迹量化要求与指南》国家标准,为企业界构建了一个科学且系统的碳足迹量化框架。本文依据该最新标准,深入探讨了产品碳足迹量化的核心方法论,并通过实例分析,直观展示了其在实际操作中的实用性和可行性。研究揭示,GB/T 24067—2024标准不仅为企业铺设了一条明确、全面的碳足迹量化道路,还助力企业发掘减排潜力,促进产品设计与供应链管理的优化升级,加速向绿色低碳经济迈进。