氮化硅结合碳化硅砖在鞍钢高炉上的应用

１９８５年以来，鞍钢有５座高炉８个炉役使用了Ｓｉ３Ｎ４－ＳｉＣ砖，本文叙述了各高炉Ｓｉ３Ｎ４－ＳｉＣ砖炉衬的设计，并结总了应用经验，６号高炉在炉身中下部使用Ｓｉ３Ｎ４－ＳｉＣ砖炉衬，其一代寿命达７年零１２天。     

新型液态搅拌铸造SiCp／A1复合材料

新型液态搅拌铸造ＳｉＣｐ／Ａ１复合材料本课题从ＳｉＣ颗粒预处理入手，利用研制的新型液态机械搅拌装置，制备了ＳｉＣ颗粒均匀分布并与基体结合紧密的铸造ＳｉＣＰ／Ａ１复合材料。ＳｉＣ颗粒尺寸５—２０μｍ，基体铝合金可以是铸造铝合金，也可以是形变铝合金。所制...     

用LecoCS—344红外碳硫仪测定SiC砖中的（含Si3N4）高碳含量

应用ＬｅｃｏＣＳ－３４４红外碳硫仪对ＳｉＣ砖中的（含Ｓｉ３Ｎ４）高碳含一的分析条件进行了并获得了满意结果。其结果与气体燃烧法的数据一致，并建立了一快速和准确的测定方法。     

喷射共沉积SiCp／Al复合材料的组织与力学性能

用喷射共沉积技术制备了含３５ｖｏｌ％ＳｉＣ的ＳｉＣｐ／Ａｌ复合材料，用扫描电镜观察了这种复合材料沉积态的孔隙和ＳｉＣ颗粒分布。在拉伸实验机上测量了不同工艺条件下制备的ＳｉＣｐ／Ａｌ的应力－应变曲线，用扫描电镜观察了雾经前先抽真空，再充氮气保护工艺条件下得到的ＳｉＣｐ／Ａｌ经热压后拉伸试样的断口形貌，实验结果表明，沉积态复合材料孔隙数量较少，尺寸较小，ＳｉＣ分布均匀，雾化前抽真空并充氮气，热压均可提     

化学气相沉积制备SiC涂层：I.热力学研究

对化学气相沉积（ＣＶＤ）法制备ＳｉＣ的热力学进行了系统研究，考察了Ｈ２－ＭＴＳ，Ａｒ－ＳｉＯ－Ｃ，Ｈ２－ＳｉＯ－ＣｘＨｙ，Ｈ２－ＳｉＨ４－ＣｘＨｙ等体系，着重研空了温度、压力、载气量和图对ＣＶＤ法制备ＳｉＣ的实验具有指导作用。     

汽车悬挂弹簧钢60Si2CrA的生产与研制

本文叙述了汽车悬挂弹簧钢丝６０Ｓｉ２ＣｒＡ工艺流程、生产工艺和检验结果，并系统地研究和探讨了我厂９５和９６年生产的６０Ｓｉ２ＣｒＡ剥皮材在非金属夹杂物、气体含量、晶粒度、石墨碳、组织以及不同热处理制度下的机性等性能和质量，为我厂进一步提高悬挂弹簧钢丝６０Ｓｉ２ＣｒＡ性能和质量提供可靠依据。     

关于高炉SiC砖的破损机理及延长其使用寿命的研究

由于ＳｉＣ质耐火材料具有较好的抗磨损性，抗氧化性和抗碱侵蚀性，用在高炉炉身部位可延长其使用寿命。分析了ＳｉＣ质耐火材料的侵蚀机理和影响其寿命的因素。介绍了ＳｉＣ质砖在鞍钢６号高炉的应用情况。提出了几点延长ＳｉＣ砖衬寿命的措施。     

预热SHS法制备β-SiC微粉的研究

用预热的方法可以解决自蔓延合成ＳｉＣ过程中硅与碳弱放热反应热量不足的问题。对预热ＳＨＳ合成β－ＳｉＣ粉末所需的最低预热温度Ｔ０、产物粒度与反应物原始粒度的关系等进行了研究。结果表明，当Ｔ０高于１０２３Ｋ时，预热ＳＨＳ可直接合成出β－ＳｉＣ粉末；合成的β－ＳｉＣ粉末的粒度主要由碳粉的粒度所决定，而与硅粉的粒度无关；在此基础上对ＳｉＣ的反应模式进行了探讨。在通氮气（ＰＮ２＝０．１ＭＰａ）情况下，预热ＳＨＳ－ＳｉＣ反应中有一β－Ｓｉ３Ｎ４的生成过程，但生成的β－Ｓｉ３Ｎ４在反应的高温下又很快分解。     

汽车悬挂弹簧钢丝60Si2CrA的生产与研制

本文叙述了汽车悬挂弹簧钢丝６０Ｓｉ２ＣｒＡ工艺流程、生产工艺和检验结果，并系统地研究和探讨了我厂１９９５年和１９９６年生产的６０Ｓｉ２ＣｒＡ剥皮材在非金属夹杂物、气体含量、酸溶铝、晶粒度、石墨碳、组织以及不同热处理制度下的机性等性能和质量，为进一步提高悬挂弹簧钢丝６０Ｓｉ２ＣｒＡ性能和质量提供可靠依据。dir     

用化学复合镀工艺制备的Ni—P—SiC镀层材料的组织,热处理和性能

使用化学复合镀工艺获得了Ｎｉ－Ｐ－ＳｉＣ金属陶瓷镀层材料，镀层中ＳｉＣ质点分布均匀，利用差热分析曲线讨论了可获得的好耐磨性能热处理制度，比较了Ｎｉ－Ｐ－ＳｉＣ和Ｎｉ－Ｐ镀层的硬度和耐磨性能。     

双钢板混凝土组合剪力墙轴压承载力研究

首先对双钢板混凝土组合剪力墙中的钢板进行了屈曲理论分析,对核心受约束混凝土进行了受力分析.以北京中国尊核心筒结构底部剪力墙为原型,进行了1/4缩尺模型的双钢板混凝土组合剪力墙试件和内置钢板混凝土组合剪力墙的轴压性能试验,对比分析其荷载-位移曲线、轴压承载力等.考虑到钢板屈曲对钢板轴压承载力的影响以及受约束混凝土轴心抗压强度的提高,提出了双钢板混凝土组合剪力墙轴压承载力的计算公式,与应用其他计算方法计算得到的试验试件的轴压承载力相比,本文提出的计算公式的计算结果与试验结果吻合度最高.结合其他文献中双钢板混凝土组合剪力墙轴压性能试验的相关数据进行验证,表明利用本论文提出的计算公式得到的轴压承载力计算值与试验结果吻合较好.      

轴向流吸附器内部流场特性

以轴向流吸附器内部流场为研究对象,采用CFD软件对其内部气体流动特性进行数值模拟.比较轴向流吸附器内无气体分布器、仅加装单一多孔板气体分布器、加装多孔板气体分布器与单级挡板相结合等3种方式对吸附器内部流场均匀分布的影响.未加装气体分布器的轴向流吸附器内部气流分布严重不均;仅加装单一多孔板气体分布器的轴向流吸附器内部流场的气体流动稍有改善,但气流分布仍不均匀;加装多孔板气体分布器与单级挡板相结合的方式,吸附器内部流场的气体流动得到明显改善.多孔板气体分布器与单级挡板组合使用时,保持气体分布器开孔率不变,开孔孔径为0.003 m时气流分布最为均匀,效果最好;保持开孔孔径不变,气体分布器的开孔率为0.388时气流分布最为均匀.      

The load applied to the foot in a patellar ligament-bearing cast

The purpose of this study was to determine whether a patellar ligament-bearing cast reduces the load applied to a foot in a cast. In a study of ten people who had no history of gait abnormalities, disease involving the motor system, or deformities of the lower extremities, we compared the load applied to the plantar aspect of a foot in a cast (as detected with F-Scan computer-monitored pedobarographic sensors) with the total load that an extremity in a cast receives relative to the ground (as detected with force-plates). Six trials were completed three times by each person. The trials consisted of walking (1) while wearing regular shoes; (2) with a patellar ligament-bearing cast on one leg; (3) with a patellar ligament-bearing cast and an overlying soft knee brace, locked in full extension, on the leg; (4) with only a below-the-knee cast on the leg; (5) with a below-the-knee cast and an overlying knee brace, locked in full extension, on the leg; and (6) with only a knee brace, locked in full extension, on the leg. The loads at peak heel-strike for all three trials were averaged and normalized to body weight. The load on the plantar aspect of the foot, as compared with the total load, was reduced a mean of 11 percent when the patellar ligament-bearing cast was worn alone, and it was reduced a mean of 26 percent when the patellar ligament-bearing cast was used with an overlying knee brace locked in full extension. This difference was significant (p = 0.007). With the numbers available, we could not detect a significant difference between the reduction in load when a patellar ligament-bearing cast was worn alone compared with that when a below-the-knee cast was worn alone or between the reduction when a below-the-knee cast was worn alone compared with that when a below-the-knee cast was used with a knee brace (p = 0.3). In conclusion, we could not demonstrate a significant reduction in the load on the foot when a patellar ligament-bearing cast was used in a traditional fashion; however, a significant (p = 0.007) reduction in load was found when a knee brace locked in full extension was worn in addition to the patellar ligament-bearing cast.     

Abdominoinguinal incision in adenocarcinoma of the sigmoid or cecum: report of two cases

PURPOSE: This study illustrates a technique allowing resection of a sigmoid adenocarcinoma with lateral fixation and a cecal adenocarcinoma with involvement of the psoas muscle and ureter. METHODS: The abdominoinguinal incision, an incision used in the resection of a sarcoma of the lower abdominal quadrants, was applied in the case of a sigmoid adenocarcinoma with posterolateral fixation and infiltration of the anterior abdominal wall and in a case of a cecal adenocarcinoma involving the right psoas muscle and ureter. RESULTS: In the first case, resection of the tumor mass en bloc with resection of the sigmoid and lower anterior abdominal wall muscles, including the inguinal ligament, was performed. Reconstruction of the muscular fascial defect was done with the rotation of a right rectus abdominis flap. The patient was well 12 months later. In the second case, the cecal carcinoma was resected en bloc with the right psoas and ureter; a right nephrectomy was also performed. This patient was well eight months later. CONCLUSIONS: The abdominoinguinal incision may provide the exposure needed to allow the resection of a sigmoid or a cecal adenocarcinoma with posterolateral fixation, often considered unresectable with conventional abdominal incisions.     

Epidemiology of endometrial hyperplasia and adenocarcinoma

In a retrospective study characteristics of 729 climacteric and postmenopausal women with hyperplasia and adenocarcinoma of the endometrium are compared with those of 82 women with atrophic endometrium and 96 women with carcinoma of the cervix. In a prospective study 225 women with glandular-cystic, adenomatous and atypical hyperplasia of the endometrium have been checked by a control-curettage within a period of two months until four years following the first diagnosis. Low parity, disturbances of menstruation with anovulatoric bleedings during fertility period, adipositas, hypertension and diabetes mellitus in climacteric and postmenopausal women indicate a high risk of carcinoma of the endometrium. Hyperplasias of the endometrium in climacteric women cannot be considered as precursors of corpus carcinoma. They are the result of a temporary hormonal dysfunction. Prophylactic hysterectomy, however, should be performed, if adenomatous or atypical hyperplasia appears in older postmenopausal women with the indicators of high risk of endometriumcarcinoma as mentioned above.     

Communication: an ophthalmic practice issue

Eight cases are reported about women with the diagnosis of HPV related lesions; a "dot-blot" hybridization technique with radioactive probes was done with each of them, also a conization with a diathermic loop (LLETZ) and a post operative follow-up with methods such as Pap smear, colposcopy and hybridization. We think the way we manage HPV related lesions has the advantage of an accurate diagnosis, with the exact envolved HPV type, and it discards the possibility of an infiltrating carcinoma, after studying the conization sample. Hybridization techniques are complementary to Pap smear in order to know the infective viral type and to exclude a possible occult infection in the post-operative period. LLETZ conization ended up as a quick and easy technique with no postoperative problems and with a proved efficiency, since neither recurrences were found (with citology) nor viral DNA was detected, the technique is not too complicated and takes about 30 minutes.     

Active and passive touch at four age levels.

Active touch, passive touch with a moving object, and passive touch with a still object were examined developmentally with 192 Ss in the 1st, 3rd, and 5th grades, and college. The stimulus objects were 10 geometric forms. Active touch and passive touch with a moving object were found not to differ significantly, and both were more accurate than passive touch with a still object. All comparisons were made with the palm of the hand. Developmental improvement of a gradual nature was found from the 1st grade through college, except for the condition of passive touch with a still object which showed no improvement between 1st and 5th grades, but more accurate performance at the college level. Developmental and touch mode differences were found with some of the 10 geometric objects. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Evaluation of the provision of fieldwork training through a rural student unit

In a clinical-experimental study the influence of variations in the palatal shape of upper removable appliances upon tongue position during swallowing was investigated. During a clinical examination of 35 dental students displaying a physiological swallowing pattern, the tongue position during swallowing was recorded by palatography on an individually adapted upper plate. During swallowing with a roughened plate with an individual palatal shape and an imitated palatal papilla, the tongue position was significantly more posterior than with a highly polished, unstructured plate. The number of students displaying a visceral swallowing pattern was significantly smaller with a roughened plate with palatal folds and papilla then with a polished, smooth appliance. A roughened, individually shaped appliance with palatal folds and palatal papilla should therefore be used after myofunctional therapy and in cases where disturbance of tongue function by the appliance is not desirable.     

A probable explanation for mild extra-articular manifestations in Indian patients of rheumatoid arthritis: a preliminary study

The combination of a total lower lip, chin, and anterior mandibular defect following cancer resection is an extremely complex problem that requires a sequence of operations to optimize functional and aesthetic results. One patient is presented in whom the defect was reconstructed with a free fibular flap followed by a series of ancillary procedures using both modern and traditional techniques. At the time of tumor ablation, the through-and-through oromandibular defect was reconstructed with a fibular osteocutaneous flap. The lower lip and gingivolabial sulcus was reconstructed later with a tongue flap. Tissue expansion was subsequently used to replace the fibular skin with expanded submental hair-bearing skin. A polyethylene implant was added later to the fibular bone for chin augmentation. Subsequently the lower lip was supported with a tendinous graft suspended to the anterior masseter bilaterally. Lastly, the vermilion border was elevated by removing a rim of the tongue flap and covering the secondary wound with a full-thickness skin graft. At the end of the reconstructive procedures, lip seal and oral aperture were good with no drooling and excellent speech.     

Nocturnal increases in the triiodothyronine/thyroxine ratio in the rat thymus and pineal gland follow increases of type II 5''-deiodinase activity

Widespread application of cochlear implants is limited by cost, especially in developing countries. In this article we present a design for a low-cost but effective cochlear implant system. The system includes a speech processor, four pairs of transmitting and receiving coils, and an electrode array with four monopolar electrodes. All implanted components are passive, reducing to a minimum the complexity of manufacture and allowing high reliability. A four-channel continuous interleaved sampling strategy is used for the speech processor. The processor and transmission link have been evaluated in tests with a subject previously implanted with the Ineraid electrode array and percutaneous connector. A prototype of the link, consisting of four pairs of transmitting and external receiving coils, was used, with the outputs of the receiving coils directed to four intracochlear electrodes through the percutaneous connector. The subject achieved speech reception scores with the prototype system that were equivalent to those achieved with a standard laboratory implementation of a continuous interleaved sampling processor with current-controlled stimuli.