试论煤炭工业可持续发展的涵义

对煤炭工业可持续发展定义进行了探讨，认为要准确界定其涵义，目前还面临许多不确定因素．从耗竭时间函数、代际公平配置和社会容忍程度的角度对有关不确定问题进行了分析，并给出了一种定义，研究了它涵盖的具体内容．     

水轮机蜗壳的下料及成形

以钣金下料为基础,采用数学模型的方法,详细介绍水轮机蜗壳的展开下料及采用瓦片压制法压制时如何确定压形线,以确保产品质量符合设计要求.     

Synthesis of needle-like aragonite from limestone in the presence of magnesium chloride

Needle-like aragonite was synthesized with a reversible solution reaction from limestone without calcinations. Scan Electron Microscope (SEM) and X-ray Diffraction (XRD) were used to characterize the morphology and the crystal structure of aragonite. The synthesis of aragonite whisker involves two steps. At first GCC (Ground Calcium Carbonate) was dissolved in an aqueous solution of magnesium chloride with reflux and air flush. Then CO₂ was bubbled into the suspension at a low temperature to produce aragonite whisker. An in-house designed reactor and acid–base titration analysis were used to measure the remaining GCC content in the reaction mixture. A kinetics equation of GCC dissolution was developed, which showed a first-order kinetic feature to magnesium chloride concentration. A reaction rate constant of 0.04234 h^?1 was obtained. The dissolution rate of GCC in magnesium chloride is much higher than that in the magnesium sulfate solution. Some aragonite whiskers with a length of ca. 20 μm and an aspect ratio of 8–12 can be synthesized.     

用现代生物技术改革生酒传统工艺的初探

该文主要探索了寿生酒传统工艺的改革，试验表明：当红曲用量减少40％，用真菌淀粉酶，黄酒活性干酵母取代，所酿制的寿生酒不仅品质更高，而且出酒率提高了5％左右。     

汽机第六段抽汽温度高的原因分析及处理

重点分析广州发电厂4台汽轮机第六段抽汽温度高的原因，并有针对性地进行系统改造，使机组运行的安全性、经济性得到提高。     

冷凝机组供热改造中汽轮机内效率的提高

纯冷凝机组进行热电联产改造时对大焓降缩放喷嘴进行改型设计，可减少因调节级后压力升高而产生的激波损失，但这种改造方法不能完全消除激波现象。针对汽机低真空供暖及打孔抽汽改造，本文分析提出不同的改造的方案，不但可以完全消除激波，且能保证汽机大部分压力级仍在原设计的参数附近运行，提高汽机总内效率，使热电联产改造获得最佳经济效益。     

组合式频率合成器在HDTV接收机中的应用

在着重讨论ＤＤＳ／ＰＬＬ组合式频率合成器在各种结构形式及特点的基础上，研究了它在高清晰度电视接收机中的应用。     

氧化钚在大鼠肺及胸淋巴结内蓄积、分布和廓清的特点

本文介绍氧化钚(~(239)PuO_2)在大鼠肺及胸淋巴结中沉积与廓清特点的实验结果。氧化钚经气管注入后,由肺的廓清过程可用三个指数项之和来表示;其在肺内分布不均匀,有向肺内淋巴组织浓集的趋势。氧化钚由肺向胸淋巴结转移较快,在注入后12小时已见分布于淋巴结,2周左右显示出向淋巴结一端、二端或沿小梁浓集的趋势。氧化钚在胸淋巴结内的蓄积过程可用幂函数表示;它在淋巴结内的分布也不均匀,主要在副皮质区。在淋巴结的分布和转移与巨噬细胞的吞噬及运动密切相关。实验结果还显示,钚粒子引起淋巴结明显的局部损伤。     

An analysis and a dynamic testing method of microwave QPSK modulation

Using the clockwise or anticlockwise stepping pulse code signal, the characteristics of general quaternary phase shift keying (QPSK) modulation are analysed. This paper gives the spectrums in several operational conditions and the admittance formulas of related two modulation circuits. Several typical examples of QPSK modulation are calculated. The modulation effect and the phase error can be decided and the QPSK modulator under the dynamic test may be adjusted by using above results. The experimental results are in agreement with the theoretical calculations. An X-band QPSK modulator is also presented. The maximum phase error is less than 4°, the phase accuracy near ±0.1°, the insertion loss less than 4 dB and the data (transfer) rate up to 68 Mb/s.