用激光感应荧光法测量钇原子束中的原子速度分布

本文用激光感应荧光法测量了钇原子束的速度分布曲线。其最可几速度为820m/s,速度分布半宽度为510m/s。由等熵关系,估计此时钇原子源的温度为1587K。     

高速冲孔单元设计

在分析如何提高生瓷带打孔机打孔速度的基础上,论述了高速冲孔单元的实现途径;并通过与普通冲孔单元的试验数据对比,得出了高速冲孔单元各项指标均优于普通冲孔单元,达到了设计要求,高速冲孔单元的研制显著地提高了生瓷带打孔机的性能.     

用共振多光子电离法研究Gd原子的高激发态

以Gd原子999cm~(-1)亚稳态为初始能级,用共振多光子电离(RMPI)方法研究了Gd原子在34463～35628cm~(-1)范围内的高激发态。实验共测得19个高激发能级。     

Colorectal Tumor Microenvironment-Activated Bio-Decomposable and Metabolizable Cu2O@CaCO3 Nanocomposites for Synergistic Oncotherapy

Rational design of tumor microenvironment (TME)-activated nanocomposites provides an innovative strategy to construct responsive oncotherapy. In colorectal cancer (CRC), the specific physiological features are the overexpressed endogenous H₂S and slightly acidic microenvironment. Here, a core–shell Cu₂O@CaCO₃ nanostructure for CRC “turn-on” therapy is reported. With CaCO₃ responsive to pH decomposition and Cu₂O responsive to H₂S sulfuration, Cu₂O@CaCO₃ can be triggered “on” into the therapeutic mode by the colorectal TME. When the CaCO₃ shell decomposes and releases calcium in acidic colorectal TME, the loss of protection from the CaCO₃ shell exposes the Cu₂O core to be sulfuretted by H₂S to form metabolizable Cu₃₁S₁₆ nanocrystals that gain remarkably strong near-infrared absorption. After modifying hyaluronic acid, Cu₂O@CaCO₃ can achieve synergistic CRC-targeted and TME-triggered photothermal/photodynamic/chemodynamic/calcium-overload-mediated therapy. Moreover, it is found that the generation of hyperthermia and oxidative stress from Cu₂O@CaCO₃ nanocomposites can efficiently reprogram the macrophages from the M2 phenotype to the M1 phenotype and initiate a vaccine-like immune effect after primary tumor removal, which further induces an immune-favorable TME and intense immune responses for anti-CD47 antibody to simultaneously inhibit CRC distant metastasis and recurrence by immunotherapy.     

层析成像技术在多相流检测中的应用

介绍了流动层析成像技术的一般概念。综述了Ｘ射线、γ射线、中子射线、超声波和电容等５大类流动层析成像技术的发展现状，最后论述了该项技术的发展趋势和工业应用前景。     

工业建筑：现代建筑的先锋

目前国内兴起工业建筑遗产保护的热潮,从历史保护的角度开展了一些研究,着重是对其记录下来的工业文明的历史保护,但对工业建筑对现代建筑所做出的贡献和影响都认识不够深入。该文通过历史追踪的方法,考察了工业建筑在工程技术上的贡献,并阐述了其在美学观念上所带来的革命性转变,试图解读工业建筑的先锋性意义,从而提炼出其对当前工业建筑设计的借鉴意义。     

住区邻里交往问题分析及对策

该文通过对住区邻里交往现状及问题的分析,结合调查提出了一些设计对策,以期从邻里交往的角度对住区规划与设计提供一定的借鉴。     

小湾水电站左岸混凝土拌和系统设计

小湾水电站左岸混凝土拌和系统布置在2#-4#山梁高边坡地段,场地狭窄,系统规模、设计难度大,本文结合场地条件,对系统的工艺设计流程、建筑物的布置、胶凝材料下送试验等进行了介绍,并对系统设计的难点、特点做了详细的论述,为以后类似的设计项目提供一些经验借鉴.     

用于图像传感器的自调节加速补偿锁相环设计

设计了一款用于高速图像传感器的可自调节、加速补偿CMOS电荷泵锁相环电路,通过在传统锁相环电路拓扑中,附加"双模式"逻辑时控的、低功耗加速充电补偿模块,实现了锁定时间与功耗的双重优化.基于180 nm/1.8 V CMOS工艺完成锁相环的电路设计和性能仿真,结果表明,基于所提出的加速补偿方案,改进后的锁相环可有效满足图像传感器对低功耗、高速、高频和低噪声输出特性的需求.在输入频率为1 GHz的参考信号时,压控振荡器可达到0.55～2.82 GHz,即2.27 GHz的频率范围,相位噪声为-98.149 dBc/Hz@1 MHz,锁定时间缩短至5.2μs,整体功耗仅为1.98 mW,同时输出的抖动噪声可低至2.81 μV/√Hz@1 MHz,多个性能指标优于所对比的同类锁相环电路.     

Uncertain multicast under dynamic behaviors

Multicast transfer can efficiently save the bandwidth consumption and reduce the load on the source node than a series of independent unicast transfers.Nowadays,many applications employ the content replica strategy to improve the robustness and efficiency;hence each file and its replicas are usually distributed among multiple sources.In such scenarios,the traditional deterministic multicast develops into the Uncertain multicast,which has more flexibility in the source selection.In this paper,we focus on building and maintaining a minimal cost forest(MCF)for any uncertain multicast,whose group members(source nodes and destination nodes)may join or leave after constructing a MCF.We formulate this dynamic minimal cost forest(DMCF)problem as a mixed integer programming model.We then design three dedicated methods to approximate the optimal solution.Among them,our a-MCF aims to efficiently construct an MCF for any given uncertain multicast,without dynamic behaviors of multicast group members.The d-MCF method motivates to slightly update the existing MCF via local modifications once appearing a dynamic behavior.It can achieve the balance between the minimal cost and the minimal modifications to the existing forest.The last r-MCF is a supplement method to the d-MCF method,since many rounds of local modifications maymake the resultant forest far away from the optimal forest.Accordingly,our r-MCF method monitors the accumulated degradation and triggers the rearrangement process to reconstruct an new MCF when necessary.The comprehensive evaluation results demonstrate that our methods can well tackle the proposed DMCF problem.