Infiltration behaviour of water in a carbon nanotube under external pressure

The wetting behaviour and associated pressure effect of water in single-walled carbon nanotubes (SWCNTs) are investigated through molecular dynamics (MD) simulations. It is found that water molecules can enter SWCNTs via surface diffusion, and the effective infiltration rate increases with pressure. The effect of pressure on infiltration rate is highly non-linear, exhibiting characteristics of both hydrophilic and hydrophobic surfaces. There exists a nominal infiltration pressure that is dependent on the SWCNT size, above which the water flux is significantly increased.     

A combination of Al diffusion and surface nanocrystallization of carbon steel for enhanced corrosion resistance

Surface nanocrystallization is beneficial to the corrosion resistance of passive alloys, but generally has a negative effect on the corrosion behavior of non-passive alloys due to the enhanced surface reactivity. In this study, a combination of Al diffusion treatment and surface nanocrystallization was applied to carbon steel with the aim of exploring an alternative approach to improve the corrosion resistance of non-passive carbon steel. The surface nanocrystallization was achieved by sandblasting and subsequent recovery treatment. The former resulted in severe plastic deformation, while the latter turned high-density dislocation cells into nano-sized grains. The present study demonstrates that the combined Al diffusion and nanocrystallization generated a nanocrystalline Al-containing surface layer on the carbon steel with its surface grain diameter in the range of 10–300 nm. The corrosion resistance of the treated steel was evaluated. It is demonstrated that treated specimens possess increased resistance to corrosion with higher surface electron stability. Surface microstructure of the treated specimens was examined using SEM, AFM, and EDS in order to elucidate the mechanism responsible for the improved corrosion resistance.     

替罗非班以及不同给药途径对AMI患者PCI术后sICAM-1的影响

探讨替罗非班以及不同给药途径对急性心肌梗死（AMI）患者经皮冠状动脉介入术（PCI）后可溶性细胞间粘附因子-1（sICAM-1）的影响.选择AMI直接PCI患者90例随机分成A、B、C三组：A组不给予替罗非班;B组PCI术后静脉给予替罗非班,C组PCI术中对梗死相关冠状动脉（IRA）内注射替罗非班,两组均静脉滴注36h;分别检测三组术前及术后24h血浆sICAM-1的浓度水平.结果显示,A组PCI术后24h血浆sICAM-1的浓度水平较术前高,而B、C两组较术前均降低,差异有统计学意义（P＆lt;0.05）,但B、C两组PCI术后差异无统计学意义（P＞0.05）.因此,对于行PCI术的AMI患者应给予替罗非班,抑制术后炎症反应以及粘附反应,降低PCI术后再狭窄的发生率,但其作用效果与给药途径无关.     

急性心肌梗死患者直接经皮冠状动脉介入治疗前后窦性心律振荡的临床观察

探讨急性心肌梗死（AMI）患者直接经皮冠状动脉介入（PCI）前后窦性心律振荡（HRT）的变化及意义.选择伴室性早搏的AMI患者（观察组）和无器质性心脏病的室性早搏患者（对照组）各42例,PCI前伴室早的观察组患者,用节律Ⅱ导联记录室早的心电图,PCI后2周时观察组及对照组均记录24h动态心电图（AECG）,计算其震荡初始（TO）和震荡斜率（TS）,并行心脏彩色多普勒超声检查,测定左室射血分数（LVEF）.结果观察组PCI后2周时和对照组LVEF分别为：（59.1＆#177;7.5）%和（61.3＆#177;8.4）%.观察组PCI前TO显著升高,TS显著降低,差异有统计学意义（P＜0.05）;观察组PCI后2周TO较前降低,TS较前升高,但和对照组相比差异仍有统计学意义（P＜0.05）;观察组PCI后2周时和对照组左室射血分数（LVEF）相比无差异.提示AMI患者HRT减弱,PCI后2周HRT改善但和观察组相比仍有统计学意义,提示AMI患者PCI后早期仍存在心脏自主神经功能下降,HRT可作为评价AMI患者预后的一个指标.     

高尿酸血症与急性脑梗死患者病情严重程度和预后的相关性研究

文章探讨高尿酸血症与急性脑梗死患者病情严重程度和预后的相关性.选择急性脑梗死患者198例,男性115例,女性83例,以前瞻性病例对照的研究方法,分析高尿酸血症与急性脑梗死患者入院时、住院10天时的病情严重程度和90天预后的相关性.高尿酸血症与急性脑梗死患者入院时病情严重程度无关（P＆gt;0.05）,与住院10天时病情严重程度呈负相关（P=0.003）,与10天时的美国国立卫生研究院卒中量表（NIHSS）转归分数呈正相关（P=0.002）,与90天预后呈正相关（P=0.001）.笔者认为高尿酸血症与急性脑梗死患者住院10天时的病情严重程度和90天预后具有独立的相关性.     

Trauma Survivors' Emotional Distress and Barriers to Early Psychological Intervention in an Inner-City Acute Surgical Trauma Service

Fifty-five predominantly low-income ethnic minority patients were interviewed and screened for early signs of psychological distress following traumatic injury. A free, brief intervention and transportation were offered to patients who evidenced psychiatric symptoms. Over half of participants reported psychiatric symptoms, but none accepted the free intervention. This study examined reasons participants remained reluctant to engage in services despite elimination of common barriers. Results highlight the importance of perceptual barriers over structural barriers in engaging patients in psychological interventions following a traumatic event.     

食管癌术后急性肾衰竭的临床分析

为了探讨食管癌术后急性肾衰竭发生的原因及防治经验,回顾性分析13例术后发生急性肾衰竭食管癌患者的临床资料,并总结防治体会。结果显示患者平均年龄67.5岁,体重50.4千克,皆有严重的吞咽梗阻症状,其中8例术前发现低蛋白血症,3例术前有不同程度的肾功能不全;术后3天内出现急性肾衰竭,治疗纠正肾前性病因、利尿和改善肾血流灌...     

农药白草枯急性中毒的研究进展

本文对近期百草枯急性中毒研究进展进行了综述,从临床角度对百草枯急性中毒的研究进行哲学思考,指出应从以下几个方面开展研究：研究发现有效拮抗剂;进行综合系统的实验研究;建立全国性救治中心;重视救治成功的个案报道;组织多中心、大样本的临床研究;多学科协作。     

急性心肌梗死复杂冠脉病变延迟支架植入治疗策略

目前我国临床实践中,急性心肌梗死的急诊介入治疗几乎均以一次性植入支架为手术终点。然而急性心肌梗死患者常伴有复杂冠脉病变,此类患者一次性植入支架常出现“慢血流”或“无复流”现象,导致心肌微循环灌注障碍,直接影响患者的预后。本文从临床策略的角度出发,探讨此类患者急诊冠脉介入治疗中延迟植入支架治疗的策略及可行性。