YC4102Q1柴油机燃用天然气的排放特性研究

通过试验研究，分析了YC4102Q1柴油机增加电控系统（ECU）和点火系统，改装为天然气（CNG）单燃料发动机后与原发动机的排放情况，并对该柴油机改装为CNG单燃料发动机的电控系统作了简单的介绍。     

Effects of boron diffusion in pMOSFETs with TiN-HfSiO gate stack

Boron diffusion in TiN-HfSiO gate stack capped with polysilicon layer has been studied. SIMS analysis indicates that a significant amount of B diffused from B-doped polysilicon through TiN layer into nitrided HfSiO gate dielectrics. Grain boundaries in TiN thin film are considered a conduit of B into HfSiO. Even though most of B was stopped within HfSiO film owing to N incorporation, significant V/sub t/ shift and interface properties degradation were observed. It was found that B in HfSiO serves as positive charge and shifts pMOSFET V/sub t/ to negative side.     

基于DSP验证平台的MP3解码算法研究与实现

本文针对基于16位定点DSP核的MP3解码算法研究及实现,提出了针对DSP芯片特点的软硬件优化设计方法,包括高级语言算法的结构优化和汇编语言的软硬件优化.在DSP验证平台上进行128Kbps,44.1KHz的立体声MP3解码,优化后运算量为46.6MIPS,程序空间为20.4Kbyte,优化率分别达到65.6%和49.6%.实验结果表明音频算法和DSP结构软硬件协同设计的重要性.     

基于LonWorks技术的电表抄表采集模块的硬件设计

主要是完成了基于LonWorks技术的电表抄表采集模块的表头信号采样模块和抄表采集器2个部分的硬件设计，并且完成了AT89C51和MCl43150Neuron芯片之间的通讯接口的设计。     

ENVIRONMENTAL IMPACT OF THE NUCLEAR INDUSTRY IN CHINA

The radiological environmental impact assessment of the nuclear industry in China has been completed. The effective dose equivalents to the critical groups are mainly within the fluctuation range of the average naturhl background radiation dose in the provinces, and below the dose limits. The annual average collective effective dose equivalent from the nuclear industry is approximately 23 man·Sv. According to the nuclear power planning of China, it is estimated that the annual collective effective dose equivalent from the nuclear fuel cycle and the application of radioisotopes is 59 man·Sv in 2000 a.     

浅谈雨季施工管理

1 雨季施工准备工作 1.1 施工场地 (1)场地排水:雨季施工应加强现场管理,合理利用场地,保证现场交通道路和排水系统的畅通.道路要有排水坡向,路边应挖设排水沟,经深沉处理后再排入附近的水渠内.塔基与建筑物之间积水者,应在塔基间加设排水管,防止因积水造成塔基下沉.     

核磁测井重油模式测量案例分析

核磁测井技术在得到广泛使用的同时,测量模式成为研究的重点。本文就核磁测井仪器的重油采集模式进行了详细分析。通过分析,该采集模式的G·TE分布适合进行稠油样品的测量,也适合进行D-T2谱的反演。本文建立了针对核磁共振重油测量模式的D-T2二维反演分析方法,通过数值模拟验证了该算法的可行性。在实验室刻度桶模拟测井中得到很好的水信号,初步证明该方法的准确性。通过渤海实际井测量案例分析再次证明了重油采集模式的可靠性。     

Embedding ultrasmall Ag nanoclusters in Luria-Bertani extract via light irradiation for enhanced antibacterial activity

Nano Research - Ultrasmall silver nanoclusters (Ag NCs) with rich surface chemistry and good biocompatibility are promising in antibacterial application, however, further development of Ag NCs for...     

Long Electron–Hole Diffusion Length in High‐Quality Lead‐Free Double Perovskite Films

Developing environmentally friendly perovskites has become important in solving the toxicity issue of lead‐based perovskite solar cells. Here, the first double perovskite (Cs₂AgBiBr₆) solar cells using the planar structure are demonstrated. The prepared Cs₂AgBiBr₆ films are composed of high‐crystal‐quality grains with diameters equal to the film thickness, thus minimizing the grain boundary length and the carrier recombination. These high‐quality double perovskite films show long electron–hole diffusion lengths greater than 100 nm, enabling the fabrication of planar structure double perovskite solar cells. The resulting solar cells based on planar TiO₂ exhibit an average power conversion efficiency over 1%. This work represents an important step forward toward the realization of environmentally friendly solar cells and also has important implications for the applications of double perovskites in other optoelectronic devices.