心脏黏液瘤的超微结构研究

对8例心脏黏液瘤进行了临床病理总结，着重进行了超微结构的研究，结果表明黏液瘤细胞有4种超微结构表现：（1）原始间叶细胞；（2）纤维母细胞样；（3）肌纤维母细胞样；（4）上皮样。提出心脏黏液瘤细胞起源于原始间叶细胞，有纤维母细胞、肌及上皮样分化。并且提出瘤细胞参与黏液瘤基质的形成。     

钢铁表面黑色转化膜处理技术

黑色转化膜技术是目前较为先进的钢铁表面处理技术 ,本文试验研究了一种新工艺 ,提出了TB值的概念 ,通过控制TB值即可控制处理液的质量 ,获得性能优良的转化膜。此工艺性能可靠 ,可操作性强 ,并可应用于激光热处理前的预处理。     

关于CEA混凝土膨胀剂的若干技术问题--与游宝坤同志讨论

作者阐述了CEA膨胀剂混凝土的膨胀量较大，干缩小，抗裂性能良好的特性，CEA与粉煤灰掺用提高强度，改善界面过渡层的性质，提高耐久性；CEA混凝土无Ca（OH）2溶出问题。文中列出GBJ119应用技术规范，说明CEA可用于防水工程。     

Direct electroless Ni-P deposition on AM50 magnesium alloy from sulfate bath

A bright electroless Ni-P deposition on AM50 magnesium alloy in a sulfate plating bath was proposed by using direct plating process with non-chromate pretreatment. The electroless Ni-P plating on AM50 magnesium alloy has an admirable appearance and good adhesion. The results indicate that the electroless Ni-P deposition with non-chromate pretreatment has better adhesion than that of zinc immersion coating. Anodic polarization curves indicate that the electroless Ni-P deposition obtained from the sulfate bath has similar corrosion-resistance to that obtained from basic nickel carbonate bath. The deposition process generates less pollutant by a non-chromate plating bath and is suitable for the magnesium alloys manufacture because of its low cost. The hardness of the electroless Ni-P plated AM50 is about HV 720.6 and HV 969.7 after heat treatments at 180℃ for 2 h. The wear resistance of Ni-P plated magnesium alloy specimens is about 5 to 9 times as high as that of bare magnesium alloys.     

活性污泥生物相对污水处理运行的指导作用

污水处理系统处理效果的好坏都与污水处理系统中组成活性污泥的微生物种类、数量及其代谢活力有关,本文从活性污泥结构、微生物种类、数量及活性等方面分析了污泥生物相与运行状态的相互关系.说明了可通过对污水处理系统的生物相观察了解处理效果及运行状况,也可通过对污泥生物相观察发现处理系统环境的变化,及时调整运行环境,预防污水处理系统的运行中的异常情况发生.     

厚膜型无溶剂环氧重防腐涂料的研究

比较了不同环氧树脂、环氧固化剂、颜填料、助剂等的特性,制备了厚膜型无溶剂环氧涂料,并进行了各项性能的检测,结果表明,该涂料具有极低的VOC含量,符合环保要求,适用于要求长效防腐的钢构件。     

Analytical general results for handoff dwell time distribution in wireless networks

1 Introduction The calling dwell time characteristic is critical for the user network planning and deployment, e.g., global system for mobile communications (GSM), as well as the next generation wireless multimedia networks, such as, the currently standar…     

两种网络安全协议分析与比较

对SSL／TLS和IPSec两种网络安全协议进行了研究，分析了协议的目的、特点，比较了性能、实用性和应用，并给出可能的优化途径。     

The effect of pack-aluminisation on the microstructure of MCrAlY and the performance of thermal barrier coatings

Plasma spraying and pack-aluminising processes were combined and applied to the nickel-base superalloy Mar-M247 to improve its cyclic oxidation resistance. The performance tests of duplex ZrO₂-8 wt.%Y₂O₃/MCrAlY thermal barrier coatings (TBCs) were conducted at 1050 °C, 1075 °C, 1100 °C, 1150 °C and 1200 °C. The results of the experiments in this study showed that TBC specimens with the aluminised MCrAlY bond coat exhibited higher cyclic lives (except for the Ni-22Cr-10Al-1Y bond coat), at all the temperatures tested, than specimens on which the bond coat was not aluminised. The microstructures of the Co-29Cr-6Al-1Y, Co-32Ni-21Cr-8Al-0.5Y and Ni-22Cr-10Al-1Y bond coats with or without aluminising treatment were examined in detail using a scanning electron microscope equipped with an electron probe microanalyzer.     

Effects of Substrate Temperatures on the Structure and UV-shielding Properties of TiO_2-CeO_2 Films Deposited on Glass by Radio-frequency Magnetron Sputtering

1Introduction Theultravioletrays(UV)insunlight(-4%)cantransmitintoroomthroughcommonfloatglass,theUVcanmakethematerialsintheroom,eg,paper,furni ture,textilefabricandplastics,becoloredanddeterio rated.ShieldingfromUVirradiationisofinterestinmanyfields.Formu…