胸部骨骼多发性骨髓瘤和骨转移瘤的X线及CT鉴别

目的 :探讨多发性骨髓瘤 (MM)与骨转移瘤 (BM)胸部骨骼受侵的X线及CT所见的不同。方法 :搜集经骨髓涂片或活检 ,病理确诊MM 36例 ,另搜集手术病理确诊为原发恶性肿瘤并骨受侵 6 7例和骨破坏病理活检为转移瘤但未找到原发灶的 3例。对两组病例胸部X线及CT影像进行分析比较。结果 :锁骨、肩胛骨、胸骨和肱骨上段受侵发生率二者差异有显著性 ,而肋骨则无显著性 ,但破坏呈膨胀型或圆、类圆型时 ,二者发生率差异有显著性 ;并发软组织肿块之发生率二者差异无显著性 ,但CT上二者各有不同特征。锁骨及肩胛骨受侵 ,呈圆、类圆型破坏发生率二者差异有高度显著性。BM胸片上可有原发及继发肺癌 ,纵隔、肺门淋巴结转移征象 ,而MM则极为少见。结论 :根据胸部各骨受侵部位、破坏类型、软组织肿块CT表现 ,有无原发、继发肺癌征象 ,在胸片上是有可能鉴别MM与BM的     

Bi-2223相的高温X-射线衍射研究

对精心制备的,其特性经过深入研究的Ｂｉ１．７Ｐｂ０．３Ｓｒ２Ｃａ２Ｃｕ３Ｏｘ（２２２３相）单相样品,在原位进行了高温Ｘ射线衍射谱研究．结果表明：压力对样品的分解影响很大,在氩气氛中（１０１．３ｋＰａ）,样品大约在７９０℃开始分解;在真空条件下,样品的分解则始于约３００℃．分解的产物很强地依赖于压力．这一研究对带材和线材的制备,对２２２３相晶格不稳定性的理解都具有重要的实际意义．     

在Si（111）上外延生长硅化钴薄膜的SEM和XPS研究

利用质量分离低能离子束外延法,在Ｓｉ（１１１）上生长出了硅化钴薄膜,表面微结构及表面组分,化学价态的分析测试表明,此生长工艺已获得了无针孔的高品质单晶硅化钴薄膜。通过反应外延后做后退火和不做后退火样品的对比测试的结果,对这一薄膜生长的机理进行了探讨分析。     

Relationship between luminescence and matrices in the system A12O3-B2O3-Ce2O3

The system Al₂O₃-B₂O₃-Ce₂O₃, with Al/B ratio varying from 4.5 to 2 and Ce/(Al+B) = 0.02, has been prepared at the temperature from 1 200 to 1 400°C. Relationship between luminescence and matrices in the system Al₂O₃-B₂O₃-Ce₂O₃ was investigated. It was found that some changes of the matrices occurred with Al/B ratio varying from 4.5 to 2. These results lead to a great change in luminescence properties, indicating variation of Ce-surroundings of crystal field. With the decrease of the ratio from 3 to 2, the excitation and emission peaks shift to shorter wavelengths. It was also found that a new type of rare earth luminescent materials was obtained with appropriate Al/B ratio.     

Relationship between luminescence and matrices in the system Al_2O_3-B_2O_3-C_2O_3

The system Al-2O-3-B-2O-3-Ce-2O-3, with Al/B ratio varying from 4.5 to 2 and Ce/(Al+B)=0.02, has been prepared at the temperature from 1 200 to 1 400℃. Relationship between luminescence and matrices in the system Al-2O-3-B-2O-3-Ce-2O-3 was investigated. It was found that some changes of the matrices occurred with Al/B ratio varying from 4.5 to 2. These results lead to a great change in luminescence properties, indicating variation of Ce-surroundings of crystal field. With the decrease of the ratio from 3 to 2, the excitation and emission peaks shift to shorter wavelengths. It was also found that a new type of rare earth luminescent materials was obtained with appropriate Al/B ratio.     

TZP陶瓷的X－射线定量相分析

采用Ｘ－射线衍射方法研究了四方相氧化锆多晶（ＴＺＰ）陶瓷中的物相，提出了应用四方相氧化锆（Ｔ－ＺｒＯ２）双谱线峰强度比Ｉ（２００）／Ｉ（００２），计算ＴＺＰ陶瓷中立方相氧化锆（Ｃ－ＺｒＯ２）含量的Ｘ－射线定量相分析方法．通过力学性能测试进一步验证了Ｃ－ＺｒＯ２的存在对ＴＺＰ陶瓷断裂韧性Ｋ１ｃ和抗折强度的影响．     

用X射线密度计测定木材年轮的含水率分布

用Ｘ射线扫描密度计测量气干材含水率及其每一年轮的水分分布。并与干燥法进行对比，其含水率测量误差在２％左右。对Ｘ射线扫描密度计测水分的原理与影响测试精度的主要因素也进行斩讨论。     

热处理对电沉积CdSe薄膜光电性能的影响

电沉积制备的CdSe薄膜经不同温度退火之后由光电化学测定和x射线衍射实验进行表征,发现随着退火温度的上升,CdSe电极的光电转换效率提高,半导体薄膜中掺杂浓度略有减小,而少子扩散长度明显增大、薄膜中的CdSe微晶呈一定择优取向的六方纤锌矿晶体桔构,且含少量六方晶型的Se,在440℃以下退火时CdSe晶型没有改变,但退火温度升高使其晶粒尺寸增大,同时Se的含量减少,讨论了薄膜光电性能与结晶学性质的关系。