基于相关检测的多通道近红外光组织光学测量系统

研制了一套基于相关检测技术的三波长多通道近红外光信号采集系统。采用相敏检波模块CD505R有效提高信噪比。Delphi开发的上位机程序通过串口方式与单片机通信。使用光纤传递光源及探测信号,使系统具有更大的灵活性,适用于多种组织光学特性测量方式。模型实验的结果证明该系统准确可靠,前臂阻断实验表明系统对不同深度组织血氧状况具有较好的测量能力。     

The evolution of an ideal stent design and its impact on the aortic endothelium during and after percutaneous replacement

Vascular support structures are important devices for treating valve stenosis. A large population of patients is treated for valvular disease and the preferred mode of treatment is percutaneous valve replacement. Stent devices are proving to be an improved technology in minimally invasive cardiac surgery. This new technology provides highly effective results at minimal cost and with a short duration of hospitalisation. Stents as a supporting structure for tissue valves have evolved over the years into remarkably useful and effective devices. During this process, a number of specific designs have come and gone, and a few have remained. Many design changes were successful, and many were not. This article describes the merits and demerits of various stent designs and details the specific reasons why a particular novel design is expected to be the most suitable implant during and after percutaneous aortic valve replacement.     

经脐单孔腹腔镜疝囊高位结扎术治疗腹股沟斜疝患儿的疗效及对血清炎性指标和免疫功能的影响

摘要 目的：观察经脐单孔腹腔镜疝囊高位结扎术治疗腹股沟斜疝患儿的疗效及对血清炎性指标和免疫功能的影响。方法：研究为回顾性研究,选取2018年1月~2020年12月期间在我院接受治疗的198例腹股沟斜疝患儿的临床资料,按照手术方式的差异分为传统组（97例）和微创组（101例）。传统组接受开放性腹股沟斜疝疝囊高位结扎术,微创组接受经脐单孔腹腔镜疝囊高位结扎术,观察两组手术相关指标、血清炎性指标和免疫功能变化情况,记录随访期间并发症发生率并作组间对比。结果：与传统组相比,微创组切口总长度更短,手术时间、住院时间缩短,术中出血量减少（P<0.05）。术后2 d组间对比,微创组免疫球蛋白M（IgM）、免疫球蛋白A（Ig A）、免疫球蛋白G（IgG）水平均高于传统组（P<0.05）。术后2 d组间对比,微创组血清白介素-6（IL-6）、肿瘤坏死因子-α（TNF-α）、C反应蛋白（CRP）、白细胞计数均低于传统组（P<0.05）。与传统组相比,微创组随访期间并发症发生率更低（P<0.05）。结论：经脐单孔腹腔镜疝囊高位结扎术治疗腹股沟斜疝患儿,具有创伤小、手术时间短、并发症少、术后恢复快等优势,且该术式引起的炎症反应及免疫抑制程度均较传统治疗更轻,是治疗此类患儿的良好选择。     

大亚湾红树林研究1.澳头港的红树植物群落

本文报道了大亚湾澳头港附近的红树植物群落的种类组成、结构、外貌及演替。该地区红树群落的主要类型有７个,即白骨壤群落、白骨壤桐花树群落、白骨壤＋秋茄桐花树群落、海漆木榄群落、海漆桐花树群落、桐花树群落、老鼠勒群落。     

Reuse of Electric Motors in Consumer Products

Product takeback calls for sound strategies of product recovery management One such strategy-is the reuse of the components of a product. There are consumer products such as power tools whose most expensive component, the electric motor; offers potential for reuse. Empirical evidence reveals that the lifetime of a motor often exceeds the life-time of the product using it. This article focuses on the reuse of electric motors. For this purpose, a novel circuit was developed that measures, computes, and records parameters strongly correlated with the degradation of a motor during the use stage of the product. This circuit, called electronic data log (EDL), provides valuable insights into the usage patterns of products. The data recorded during the use stage are retrieved after product takeback as a basis for reuse decisions. In this article, the trade-off between higher initial manufacturing cost caused by the EDL and cost savings from the reuse of used motors is analyzed. The problem of misclassifications of used motors is also addressed. It is shown that the return rate of used products is the critical parameter determining the economic efficiency of a motorreuse strategy based on EDLs. The analysis shows that the implementation of EDLs in products as an enabler for motor reuse may be associated with large cost savings     

Challenges to the Primary Jurisdiction of Flag States Over Ships

With the increasing emergence of substandard ships sailing under the flag state's ineffective control and the growing number of accidents that negatively affect the marine environment and the maritime order, port states, coastal states, and international organizations have begun to develop new regimes to increase their control over ships. As a result, the authority of flag states is increasingly being challenged, seemingly calling into question the primary jurisdiction and control of flag states over their ships. The aim of this article is to promote a better understanding of the relationship between flag state, coastal state, and port state control.     

PDCA循环在提高肿瘤患者输液港护理依从性的应用

目的探讨PDCA循环在提高肿瘤患者输液港护理依从性的应用效果。方法选取2018年2~8月我院收治的504例输液港置管的肿瘤患者按随机分配原则分为对照组240例和观察组264例,对照组给予一般治疗和常规管理,观察组在对照组基础上实施PDCA循环管理,观察两组患者的并发症发生情况、输液港护理依从性,并进行统计分析。结果观察组的并发症发生率明显低于对照组,差异有统计学意义(P<0.05);观察组的输液港护理依从性明显高于对照组,差异有统计学意义(P<0.05)。结论运用PDCA循环能优化维护流程,降低并发症,提高患者输液港护理依从性,值得临床应用。     

竹红菌素B的两种剂型用于鲜红斑痣光动力治疗的动物实验研究

目的:观察竹红菌素B的脂肪乳剂型和脂质体剂型对鲜红斑痣动物模型的光动力作用是否有差异,并观察其光动力效应及副作用。方法:莱亨鸡32只,分为对照组;HMME组;脂质体0.5 mg/kg组和1.0 mg/kg组;脂肪乳0.5 mg/kg组和1.0 mg/kg组。莱亨鸡静脉注入光敏剂后,立即用532 nm的激光照射鸡冠直径1 cm的圆形区域,激光剂量为功率密度100 mW/cm2,能量密度120 J/cm2。PDT后每天进行观察照像,14 d后取材进行病理观察。结果:HMME组6例皆为中度改变,真皮浅层血管网明显减少,结痂轻。脂肪乳0.5 mg/kg组6例中5例为重度改变、1例为中度改变,脂质体0.5 mg/kg组6例皆为重度改变,病理见表皮增生,真皮浅层血管少,结中等厚度的黒痂。脂肪乳1.0 mg/kg组6例皆为极重度,脂质体1.0 mg/kg组5例为极重度改变、1例为重度改变,病理为痂下坏死灶,部分修复的表皮增生,真皮浅层几乎无血管,结黑色厚痂。结论:HB的脂肪乳剂型和脂质体剂型对鸡冠的光动力效应基本一致,都具有较好的血管破坏作用,但对正常表皮和真皮的损伤较重。     

The Speciation of Organotin Compounds in Sediment and Water Samples from the Port of Gdynia

Organotin compounds (OTC) are toxic towards all living organisms. The application of organitin-based antifouling systems is becoming the main source of OTC in the ocean. Harbor sediments and water contain large deposits of organotin compounds due to application of antifouling systems in the shipping industry. OTC contamination presents a potential risk to the marine environment.

Sediment and water samples were collected in 2009 from Gdynia Harbor. For all the analyzed organotin compounds, the mean concentration values were determined: water samples monobutyltin (MBT): 13.2, dibutyltin (DBT): 16.7, tributyltin (TBT): 60.7 (ng cation dm^?3), and sediment samples MBT: 261.4, DBT: 751.9, TBT: 2148.2 (ng cation g^?1 d.w.). The estimated content of monophenyltin (MPhT), diphenyltin (DPhT), triphenyltin (TPhT), monooctyltin (MOT), dioctyltin (DOT), and tricyclohexyltin (TCHT) were below the detection limit of the applied method. It was found that the content of organic matter, the amount of fine fraction, and the pH all play a significant role in the distribution and sorption process of OTC between the water and the sediment on the bottom. Compared to an earlier study, the concentrations of all OTC are much lower, confirming that the applied legislation has had a positive impact.