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1.
对两块随加氢反应器运行了近5×104h的带焊缝的214CrlMo钢试板进行了试验,以了解加氢反应器实际操作工况对214Cr1Mo钢的时效作用。拉伸试验结果表明,母材和焊缝金属的抗拉性能没有劣化;母材制带人工裂纹缺陷的小容器爆破试验结果表明,试板母材的综合机械性能良好,仍有足够的韧性储备;试板母材与焊缝金属的冲击试验表明,母材仍具有较高的韧性,而焊缝金属已明显脆化;脱氢和脱回火脆处理的焊缝金属的冲击试验结果揭示了焊缝金属脆化是由回火脆化造成的,扫描电镜观察也证明了这一点  相似文献   

2.
用电解充氢方法研究了加氢反应器用2—1/4Cr-1Mo钢的氢脆。为研究该材料抗氢脆的性能,试样中的氢浓度约6.22μg/g,比反应器的实际操作工况更恶劣。结果表明该材料的抗氢脆性能较好,经脱氢处理后其韧性得以恢复。  相似文献   

3.
提出了定量评价堆焊层抗离性能的指标“开裂氢浓度Cdc”。研究结果表明,在不同试验条件下,对同一批堆焊试块的剥离性能进行评价,所得到的Cdc值基本上为一常量。因此,可将Cdc作为定量评价的参量。这种评价方法还能将堆焊试块的试验结果与役反应器堆焊层的剥离问题联系起来。  相似文献   

4.
对所选的CaO-Al2O3-SiO2系统中4个组分的微晶玻璃样品的部分重要性能进行了测试,利用XRD、IR、SEM等仪器对样品的析晶形貌和结构进行了分析;应用齿科材料相关的性能测试标准,考察了其用作齿科全瓷冠修复材料的可能性。实验发现:样品经微晶化处理后,试样中主要析出了钙铝方柱石和α-硅灰石晶相,这些晶相的析出提高了玻璃的性能。G3样品的化学稳定性等物化性能指标均达到或超过了天然牙齿相应的性能.  相似文献   

5.
在对混合丁醛加氢制丁醇的反应体系进行热力学与动力学分析的基础上。采用一维拟均相数学模型对丁醛加氢制丁醇管壳式固定床反应器进行数学模拟设计。预测了反应温度、冷却介质温度、反应压力和反应空速对加氢反应结果的影响。结果表明:丁醛加氢制丁醇的数学模拟结果与生产数据吻合良好。  相似文献   

6.
新生儿、婴幼儿在生理结构、免疫防御功能等方面具有与成人不同的特点,使感染性疾病在小儿中多见,因此抗菌药物在儿科领域中的应用十分广泛。本文试从我院病案室随机抽取1995—1997年儿科住院病历300份,调查分析抗菌药物在儿科病人中的应用情况,以期为临床合理应用抗菌药物提供有益信息。1材料与方法采用回顾性调查方法,随机从病案室抽取1995~1997年住院病历300份(病例300例),每年度平均抽取100份,进行有关抗生素的使用情况调查,包括:抗生素名称、种类、病种,是否进行细菌培养和药敏试验,抗生素的联用情况等。2结果2.1病种分…  相似文献   

7.
可吸收球囊制作的实验研究   总被引:2,自引:0,他引:2  
目的研究以可降解吸收的高分子材料制成的可吸收球囊的生物学性能及其用于椎体成形术治疗胸腰椎爆裂骨折的可行性。方法采用可吸收高分子材料——DL-乳酸与ε-己内酯(70:30)的共聚物(PDLLA—CL)制造直径1.9cm的可吸收球囊,进行体外降解试验和动物实验,观察胫骨上端回植骨块的愈合情况及球囊的吸收情况。结果可吸收球囊的初始拉伸强度为8.5MPa,2周后为4.2MPa,于体外24周可完全降解。载负磷酸钙骨水泥的可吸收球囊的动物实验显示,于16周时,球囊已部分吸收,胫骨上端开槽处回植骨块愈合良好,无骨膜反应和排斥反应。结论采用PDLIA—CL研制的可吸收球囊,一方面具有良好的生物相容性,对机体正常组织结构无不良影响;另一方面具备良好的机械性能,可以将灌注入内的磷酸钙骨水泥与周围组织形成一个良好的分割屏障,有效防止骨水泥的渗漏。  相似文献   

8.
为适应新生儿外科发展和临床工作需要,我们观测了50例新生儿呼吸道的解剖。本文就有关气管内插管问题进行讨论如下。材料与方法本组材料用10%甲醛溶液固定新生儿尸体38具,另12具将死后尸体浸泡消毒12小时后进行解剖。男性27例,女性23例。日龄从生后数小时至33天为  相似文献   

9.
目的探讨链脲佐菌素(saz)诱导的糖尿病大鼠肾组织RANTES的表达及与24小时尿白蛋白、血糖的关系。方法sD大鼠随机分为正常对照组和糖尿病组,每组15只。于实验第4周、8周、12周末,两组随机选出5只大鼠检测24小时尿白蛋白和血糖,通过RT—PCR、ELISA法检测肾皮质RANTES表达。结果通过RT—PCR及ELISA检测,RANTES表达在第12周糖尿病组较正常对照组显著增加(P〈O.01);24小时尿白蛋白在第8周、第12周糖尿病组显著高于正常对照组(P〈0.05或P〈0.01)。结论糖尿病大鼠肾组织RANTES表达增加,并且与24小时尿白蛋白存在正相关。  相似文献   

10.
目的:探讨统计参效图在脑血氧水平依赖功能磁共振成像研究中的应用价值。方法:本研究被试者共87例。其中中枢性运动功能异常组被试57例,正常对照组被试30例。本研究的运动功能刺激实验设计为组块设计(Block—Desk)。激活效据采集在双梯度1.5TMR扫描仪上完成,包括定位像、解剖像、功能像、全脑3D像。所有数据用统计参数图软件包离线后处理,经过一系列的预处理和统计分析,得到脑运动区激活统计参数图,研究脑激活区与脑解剖功能区的对应关系。并生成各种量化分析数据以进行相关性分析等统计学处理。结果:异常组被试57例脑血氧水平依赖功能磁共振成像原始资料,经统计参数图后处理,结果符合临床诊断要求的46例(80.70%),正常对照组被试30例。经统计参数图后处理,结果符合临床诊断要求的29例(96.60%),两组结果比较相差显著(X^2=4.21,P〈0.01),提示正常对照组被试数据经统计参数图后处理结果符合诊断要求的百分率大于异常被试组。结论:统计参数图内置多项顶处理步骤,可较有效地排除或减弱被试者的头动、心跳、呼吸及MRI设备系统噪声等干扰因素造成的伪影/影响。有效的预处理在肢体运动功能异常者的脑血氧水平依赖功能磁共振成像数据处理中起了至关重要的作用,是确保脑血氧水平依赖功能磁共振成像激活结果的灵敏性和可靠性的关键手段。  相似文献   

11.
FOR anesthesiologis s ,treatingpostoperativepainhas alwaysbeen a problem.Althoughopioidshave been provedtobe effective,theirsideeffectscouldnotbeignored.With thedevelopmentofscienceand pharmacology,many drugs with aspectsof satisfactoryanalgesicefficacyand couldbe welltoleratedby patientshave been developed.And lornoxicamisone of them, which isa non-steroidalanti-inflammatorydrug (NSAID ), with analgesic, anti-infl-ammatory,andantipyreticproperties.Itseliminationhalf-time(3 to 5 hours) isle…  相似文献   

12.
Dr.Zhang Ren,the chief physician,is the chairman of Shanghai Acupuncture and Moxibustion Association.Having been engaged in medicine for about 40 years,he is experienced in treating various intractable diseases.In his long years of clinical practice,he advocates taking the TCM differentiation as the basis to seek for the acupuncture method for treatment of modern intractable diseases.The author of this essay had the fortune to follow Dr.Zhang in study.The following is a summary of Dr.Zhang's experience in the acupuncture treatment for different intractable diseases with the same therapeutic principle.  相似文献   

13.
In treating chronic nephropathy,Luo Lingjie,a chief physician,pays attention to regulating the balance between yin and yang,treating infection if present,and removing pathogenic factors.He prescribes gentle drugs and uses carefully strongly warming-tonifying ones,emphasizes the importance of persuading the patient to persist in treatment with medication and nurse one's health for recuperation,and is good at combined use of TCM and western medicine therapy and brings the merits of various therapies into full play,with obvious theraoeutic effects.  相似文献   

14.
Objective: To observe the therapeutic effects in acupunture treatment of primary dysmenorrhea combined with spinal Tui Na, and study its mechanism. Methods: Thirty cases of the treatment group were treated by acupuncture combined with spinal Tui Na, and thirty cases in the control group were treated by routine acupuncture. Results: The total effective rate was 93.3% in the treatment group, and 73.3% in the control group, with a significant difference between the two groups (P<0.05). Conclusions: Acupuncture combined with spinal Tui Na has good prospects for treatment of primary dysmenorrhea.  相似文献   

15.
16.
目的 探讨猪肺磷脂注射液联合经鼻持续气道正压通气(NCPAP)对呼吸衰竭早产儿的临床疗效及肌酸激酶同工酶活性(CK-MB)的影响.方法 选取呼吸衰竭早产儿80例,分为观察组和对照组各40例.对照组采用NCPAP给氧治疗,观察组给予NCPAP给氧联合猪肺磷脂气管内给药.观察两组患儿治疗前及治疗12h、24 h后PaO2、PaCO2、血氧饱和度(SaO2)、pH的变化情况,检测治疗前及治疗5d后血清CK-MB水平;评估两组患儿的临床治疗效果.结果 两组患儿PaO2、PaCO2、SaO2、pH比较,差异均有统计学意义(P<0.05),其中观察组治疗后的PaO2、SaO2、pH均高于对照组,PaCO2则低于对照组.两组的PaO2、SaO2、pH均随观察时间延长而升高(P<0.05),PaCO2均随观察时间的延长而降低(P<0.05).观察组治疗有效率为87.5%,显著高于对照组的70.0% (P <0.05).治疗5d后两组患儿血清CK-MB水平均较前降低(P<0.05),且观察组明显低于对照组(P<0.05).结论 猪肺磷脂注射液气管内给药联合NCPAP可以显著降低呼吸衰竭早产儿CK-MB的含量,提高治疗有效率,起到很好的呼吸循环支持作用.  相似文献   

17.
CASE HISTORY A female patient, 46 years old, head of the foreign affairs department of a certain university in Beijing, paid her first visit on October 9, 2006, with the chief complaint of vomiting for one month. She got vomiting after meals in early September. Before that, she had discomfortable sensation in the stomach due to angry with others, but she didn't pay much attention. Later, it developed into vomiting after eating. After the vomiting, the discomfort would be relieved, but with slight hypodynamia. She was once diagnosed as having 'neurogenic vomiting'. Having taken some western and Chinese drugs, the above symptoms were a little bit improved, but she would have nausea upon eating and with regurgitation. Because of the fear for vomiting, she did not dare to have food intake, with body weight reduction of 6 kilos in one month.  相似文献   

18.
Radiotherapy and chemotherapy are the important modern medical therapies for malignant tumors,yet they can also bring about serious local and systemic toxic side reactions so to decrease the patient;'s life quality,manifested by a series of consumptive symptoms.Having engaged in the combined work of Chinese and western medicine for nearly 50 years,the research fellow Qiu Baoguo in Henan Provincial Academy of TCM has developed his unique views on the TCM study of consumptive syndromes.The author of this essay had once the fortune tO follow Dr.Qiu in clinic,and specially would like to introduce in the following Dr.Qiu's experience in treating consumptive syndromes after radio-chemotherapies for patients with malignant tumor.  相似文献   

19.
OBJECTIVE: To observe therapeutic effects of the comprehensive therapy of acupuncture-moxibustion and Chinese Tuina for treatment of insomnia due to deficiency of both the heart and spleen. METHODS: 92 cases were divided randomly into the treatment group (treated by acupuncture-moxibustion and Chinese Tuina) and the control group (treated by acupuncture-moxibustion). RESULTS: The therapeutic effect of the treatment group was obviously superior to that of the control group (the CHI2 test showed P < 0.01). CONCLUSIONS: The comprehensive therapy of acupuncture-moxibustion and Chinese Tuina can give marked therapeutic effects for treatment of insomnia due to deficiency of both the heart and spleen.  相似文献   

20.
Evidence obtained from randomized controlled trials (RCTs) has been generally accepted as the gold standard in the evaluation of clinical effectiveness. Readers need to understand the trial design, implementation, results, analysis and interpretation, so as to fully Jnderstand the results of RCTs. Thus, the investigators of RCTs have to report these items in a complete, accurate and clear manner. Since 1998, we have conducted several evaluations on the reporting quality of RCTs published in Chinese journals on traditional Chinese medicine (TCM) and results have shown that there is an urgent need for higher quality RCTs on TCM.  相似文献   

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