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1.
采用高导电率的纳米粉体ATO(SnO2·Sb2O3)为抗静电剂,从6种不同类型的分散剂中筛选出聚乙烯亚胺,通过设计正交实验探索出最佳工艺组合,将纳米ATO稳定均匀地分散于去离子水中,将该悬浮液作为聚丙烯腈纤维纺丝过程的预热浴,来改善聚丙烯腈纤维的抗静电性,研究了ATO用量、添加位置等对纤维抗静电性能、力学性能的影响。  相似文献   

2.
采用三步共缩聚法制得聚对苯二甲酸乙二酯聚醚酯/锑掺杂二氧化锡复合聚酯。用红外光谱和核磁共振表征了复合聚酯的分子链结构:锑掺杂二氧化锡表面的羟基与聚醚酯链段上的β二元酸反应生成了氢键,有利于其在复合聚酯中的分散;对苯二甲酸二乙酯与聚醚酯共缩聚生成了聚对苯二甲酸乙二酯聚醚酯共聚酯。扫描电镜和透射电镜结果表明:锑掺杂二氧化锡团聚体尺寸为50~150 nm,在聚合物基体中均匀分散。差示扫描量热测试表明:聚醚酯和锑掺杂二氧化锡的引入提高了复合材料的结晶速率、结晶度和结晶热稳定性。熔融纺丝后制得的抗静电复合涤纶纤维的体积比电阻为3.4×108 Ω·cm。  相似文献   

3.
由脂肪酸和二甲胺基乙醇进行酯化,再以卤化物季铵化的方法,合成了十二种文题化合物。测定了它们用于腈纶纤维、涤纶纤维及涤纶平绒织物的抗静电效果,讨论了影响抗静电效果的因素。发现月桂酸及棕榈酸的二甲胺基乙醇酯与氯甲烷形成的季铵盐,具有卓越的抗静电性,超过了常用的抗静电剂SN。  相似文献   

4.
对短切聚酯纤维进行化学镀银,制备了用于导电高分子材料的导电填料,探讨了氨水浓度、装载量及稳定剂对纤维化学镀银的影响。实验表明,φ=0.10的氨水有利于化学镀银;通过调整装载量,可提高纤维的增重量率和硝酸银的利用率;稳定剂的加入可阻止镀液自分解,但对包覆层的均匀性和致密性有影响。电性能测试表明,镀银纤维的体积电阻率可达3.35×1-0 3Ω.cm,以其作为导电橡胶填料,当含量为w=0.40时,其电阻率为1.54×1-0 1Ω.cm。  相似文献   

5.
以苯乙烯辅助马来酸酐接枝聚丙烯(PP—g-(MAH—co—St))为相容剂与聚丙烯(PP)、尼龙6(PA6)、改性共聚酯(HCDP)按一定配比共混纺丝,实验表明该共混体系具有良好的相容性。改性聚丙烯纤维的染色性能得到明显改善,可以被分散染料染成深色,并且其抗静电性能明显提高。通过流变性能测试,拟定了主要纺丝工艺,并分析了纺丝温度、纺丝速度、纤维纤度等参数对纤维结构和性能的影响。实现了在高速纺丝条件下制备可染聚丙烯纤维,为工业化生产可染聚丙烯纤维作出了有益的探索。  相似文献   

6.
复发性阿弗它溃疡是口腔常见多发病,本试验观察采用口腔溃疡膏局部涂敷疗复发性阿弗它溃疡患者78例,药膏主要成分为中药锡类散及地塞米松和达克罗宁。每日4-6次,饭前半小时涂敷,发病时还是应用。通过自身观察,涂敷溃疡膏后愈合期明显缩短,呈显著性差异(p<0·01),在治疗中显效的54例(69·23%),有效的21例(26·92%),欠佳的3例(3·85%),78例均有良好的止痛效果。  相似文献   

7.
以聚对苯二甲酰对苯二胺(简称芳纶,PPTA)纤维为基材,使用环氧氯丙烷(ECP)对PPTA表面进行有机修饰,得到了ECP改性的PPTA纤维(ECP-PPTA),然后使苯胺单体在ECP-PPTA表面接枝聚合,制备了ECP-PPTA/PANI复合导电纤维。用傅里叶变换红外分光光度计(FT-IR)、扫描电子显微镜(SEM)、热重分析仪(TGA)及X射线衍射分析仪 (XRD)等分析测试方法对ECP PPTA及ECP-PPTA/PANI复合导电纤维进行了表征。结果表明:PPTA经ECP改性后,PANI成功接枝在PPTA表面,制备的ECP-PPTA/PANI复合导电纤维的电阻率低于PPTA/PANI纤维的,其室温电阻率最低为0.32 MΩ·m。  相似文献   

8.
某例摘要 1.张××,男 42岁,既往健康,无吞噬不适.但有饮酒史,于1996年十月二十二日饮洒后与他人发生口角,被拳击后倒地死亡.2.尸检;外表发育正常,体健,下唇左侧有1.8×0.7cm浅表裂口创,上口唇左侧粘膜有4×2cm浅表出血区及相应中城区有1.0×0.5cm浅表裂口创,颈前喉节下有4×2cm肌间散在出血区;胸前皮下疏松组织中有4×3cm散在出血区,口腔.气管及一、(?)级支气管内有食物残渣阻塞.胃腔内食物充盈,心肺表面散在出血点,胸骨后,上前纵隔于纤维脂肪组织表面有近扁圆形的6×4×2cm重量39g,界限清楚,纤维包绕的韧性肿物;光镜下,淋巴组织为主型胸腺痛周围纤维脂肪组织中未找到胸腺组织.  相似文献   

9.
超声引导下注射氨甲喋呤治疗子宫肌瘤的初步研究   总被引:1,自引:0,他引:1  
目的:观察超声引导下经阴道向瘤体内注射氨甲喋呤(MTX)治疗子宫肌瘤的效果。方法:对30例子宫肌瘤患者采用超声引导下经阴道瘤体内注射MTX,剂量50~60mg,每月1次,连续注射3个月,定期复查B超,观察肌瘤大小的变化;彩超下观察注药前后肌瘤血供情况变化。其中2例患者在注药1个月后接受手术治疗,切除的肌瘤标本行光镜和电镜下组织观察分析并与未注药的肌瘤标本(对照组)相比较。结果:28例子宫肌瘤患者治疗前体积为(59·21±21·76)cm3,注药1个月后体积为(48·67±25·87)cm3,与治疗前相比无明显差异(P>0·05);第2次注药1个月后肌瘤体积为(41·43±27·01)cm3;第3次注药1个月后肌瘤体积为(32·20±19·71)cm3,与治疗前相比,均有显著差异(P<0·05);注药半年后的肌瘤体积为(30·51±17·37)cm3,与注药3个月时的体积相比较无明显差异(P>0·05)。彩超下显示注药后的肌瘤组织内部血流信号减弱,血供明显减少。治疗后3个月时肌瘤血供与治疗前相比,有显著差异(P<0·05);半年后肌瘤内血流信号与治疗前相比,仍有显著差异(P<0·05)。光镜下可见注药后的肌瘤活检切片单位视野内的平均血管数较对照组明显减少,管腔变窄,肌瘤细胞水肿及变性;电镜下可见细胞内质网及线粒体有明显的水肿及变性。结论:超声引导下经阴道瘤内注射MTX治疗子宫肌瘤疗效确切,近期效果满意,操作简单,副作用小。  相似文献   

10.
1一般资料患者女,50岁,因查见右乳肿物两天于2004年7月29日入院。体检:右乳外上象限可触及2cm×2cm大小肿物,质硬,诊断为乳腺癌,于8月1日行手术切除,术中见右乳外上象限有一2cm×2cm×1·5cm大小包块,质硬,界限不清,遂行病理冰冻切片技术检查。检查见肿物体积2cm×1·8cm×1·5cm,灰白、质硬,诊断为乳腺小叶癌。随后行右乳房改良根治术。2病理检查巨检:乳腺组织体积16cm×14·5cm×7·5cm,皮瓣面积14cm×15·5cm。乳头直径1·3cm,距乳头10·5cm处见一刀口,长3cm,其下为冰冻切片技术检查后所余残腔,腔内有暗黄色粘稠物流出,见扩张的导管。残…  相似文献   

11.
Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P < 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (>0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P <0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P < 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.  相似文献   

12.
Objective: To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods: SD rats served as both donors and recipients. 4℃ sodium lactate Ringer's was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava (IVC) inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results: Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion: This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.  相似文献   

13.
Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P< 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P< 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.  相似文献   

14.
Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.  相似文献   

15.
Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.  相似文献   

16.
A clinical guideline for the therapeutic interventions of integrative medicine may be defined as a written document which states a series of recommendations on therapeutic interventions of integrative medicine for a special disease or condition. The guideline may provide assistance to medical professionals in making clinical decisions aimed at improving the clinical outcome of patients and reducing the costs of medical care(~'4~. Recommendations issued by a guideline should be based on the best available evidence in both Western and Chinese medicine. For fulfilling this purpose, the development of clinical guidelines for therapeutic interventions in the field of integrative medicine should follow scientific principles and undergo a rigorous processes.  相似文献   

17.
Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.  相似文献   

18.
目的:评价使用安心颗粒对急诊经皮冠状动脉介入术(PPCI)术后生活质量的影响.方法:将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组(术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次)和对照组(仅接受基础药物治疗).所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表(MIDAS)、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果:入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异(P>0.05);出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低(P<0.05);组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低(P<0.05).两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血(P>0.05).两组发生轻度血小板减少症的患者数比较无差异(P>0.05).结论:PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.  相似文献   

19.
Journal of Nanjing Medical University (English Edition) JNMU, sponsored by Nanjing Medical University, was established in 1987. It is a bimonthly comprehensive English medical journal published locally and abroad.Since 2007, Journal of Nanjing Medical University (English Edition )was granted Elsevier the full publishing and distribution rights worldwide for the Electronic Edition, excluding the People's Republic of China.  相似文献   

20.
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   

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