Clinical outcomes of laparoscopic and endoscopic cooperative surgery for gastric gastrointestinal stromal tumor

Background: Laparoscopic and endoscopic cooperative surgery (LECS) is a well-recognized surgical procedure for gastric gastrointestinal stromal tumor (GIST). In this report, we describe the clinical outcomes of LECS procedures for gastric GIST in our institution. Methods: We performed LECS procedures, including classical LECS, inverted LECS, closed LECS, and combination of laparoscopic and endoscopic approaches to neoplasia with non-exposure technique (CLEAN-NET), in 40 gastric intraluminal and intramural type GIST patients, whose tumors were ≤ 50 mm in diameter, between September 2012 and December 2020. The patient background, surgical outcomes, postoperative morbidity and mortality, as well as the tumors' clinicopathological characteristics were analyzed retrospectively. Results: Pathological findings showed that most patients had a low or very low risk of tumor recurrence, while one patient had a high risk according to the modified-Fletcher's classification. The median length of postoperative hospital stay was 7 days. Only one patient had severe postoperative grade III complications according to the Clavien-Dindo (C-D) classification, after closed LECS, but was treated successfully with endoscopic hemostasis for postoperative hemorrhage. The remaining patients treated with LECS did not have severe complications. During the follow-up period (median, 31 months), all patients were disease-free, with no tumor recurrence or metastases. Conclusion: LECS is a safe surgical procedure for gastric intraluminal and intramural type GIST ≤ 50 mm in diameter, with good clinical outcomes

城市水务产业的价格规制改革:规制重构

水务产业是一种具有自然垄断性、经营地域性、公益性及资源稀缺性的“网络型”产业。基于水务产业的特性,以及现行价格规制的不得力,必须对现行价格规制模式进行改革,以达到价格水平合理和产品提供高效率的目标。本文以西方价格规制理论的有关原理为基础,结合我国的实际状况,对价格规制模式进行了重构,以期使之在我国更具适用性。制度建设在规制改革问题上起着举足轻重的作用,因此需推动制度建设

Process Simulation and Techno-economic Analysis on Hydration and Hydrogenation Technology of Acrolein for 1,3-Propanediol Production

基于丙烯醛水合加氢法制1,3-丙二醇(PdO)的小试和中试结果,应用SuPErPrO dESIgnEr~(？)模拟软件,建立年产万吨PdO的工业放大过程模拟,并进行技术经济分析.结果表明,主要过程数据符合实验结果,工艺模拟设计合理;经济分析显示,原料成本占生产成本49%,设备购置费用约2242万元,总投资约15088万元,年税后净利润约4256万元,投资回收率28.21%.Based on laboratory and pilot experiments of hydration and hydrogenation of acrolein for production of 1,3-propanediol(PDO),the Superpro Designer? emulator was applied to simulate the scale-up process for 10000 t/a PDO production,coupling with costing and economic evaluation on the flowsheet Simulation results show that the process design is reasonable with main process data complying with experimental results.The economic analysis indicates that raw material cost shares 49%of operating cost,equipment purchase cost is about 22.42 million yuan and the total investment is of approximately 150.88 million yuan.The expected returns on investment reach 28.21%as the after-tax profit is about 42.56 million yuan annually.福建省高校产学合作科技重大基金资助项目(编号:2010H6023

Distribution of Black Carbon in the Surface Sediments of the East China Sea and Their Correlations with Persistent Organic Pollutants

本文采用化学热氧化法测定了25个东海内陆架表层沉积物中黑碳的含量;探讨了沉积物中黑碳与总有机碳、粒度以及持久性有机污染物之间的关系.结果表明;东海内陆架表层沉积物中黑碳的含量范围为0.21～0.88 mg.g-1.沉积物中黑碳和总有机碳之间没有显著的相关性;表明两者具有不同的来源.区域内沉积物在粒度上有明显的空间分异;黑碳的空间差异则较小;表明黑碳的沉积过程受颗粒物分选过程的影响较小.沉积物中多环芳烃和滴滴涕的含量与黑碳无显著的相关性;可能与东海内陆架环境中强烈的水动力过程和持久性有机污染物来源的复杂性有关

A Preliminary Study on Brown Carbon Emissions from Open Agricultural Biomass Burning and Residential Coal Combustion in China

近年来的研究表明,在BC(黑碳)和OC(有机碳)之间,还存在着一种有弱吸光能力的OC,因大多显棕黄色而被称为BrC (brown carbon,棕色碳). 广泛存在的秸杆焚烧和冬季大量民用燃煤的使用,使国内BrC 排放严重,但鲜见对其排放量的测算. 采用七波段黑碳仪(aethalometer)方法,对夏季小麦秸杆焚烧过程及冬季民用炉燃煤过程产生的烟气进行现场监测,根据BrC 与BC的光谱关联性差别,分化出R_(BrC/BC)(总光学衰减中BrC和BC的相对贡献). 结果表明: 麦秆焚烧和民用燃煤烟气的R_(BrC/BC)分别为1. 754 ± 0. 278和0. 183 ± 0. 142. 借助R_(BrC/BC)值,结合现有的BC 排放清单(2000年),初步推算出中国民用燃煤和秸杆田间焚烧 BrC的排放总量(以BC 当量计,下同)为(270. 6 ± 101. 6)Gg,接近同期BC 排放量的一半; 其中秸杆焚烧的BrC 排放量为(175. 4 ± 27. 8)Gg,约占二者总量的65%; 民用燃煤的BrC 排放量为(95. 2 ± 73. 7)Gg,约占35%. 该研究结果可为更全面的BrC 排放测算奠定基础,并为研究BrC的大气化学及辐射强迫提供依据