Magnetic Properties and Washability of Roasted Suspended Siderite Ores

Steel is one of the most important industrial materials, which mainly comes from the smelting of iron ore. In view of the huge steel consumption every year, the exploitation of vast reserves of siderite ores is significant for improving the self-sufficiency rate of iron ore resources and ensuring the strategic security of the iron and steel industries. This paper investigated the influence of temperature, time, and other parameters on the magnetic properties of roasted siderite ores using the method of suspended roasting and analyzed the washability of roasted ores under weak-magnetic-field conditions using the magnetic separation tube experiment. The findings of the study explained the iron phase transformation process, i.e., FeCO₃ was transformed into Fe₃O₄ by suspension magnetization roasting. Furthermore, the saturation magnetization of the roasted ore increased in due time at a constant temperature range of 550–750 °C and a roasting time of less than 5 s. It also increased with increasing temperature and constant time. The roasted ore achieved the best magnetic characteristics after roasting at 750 °C for 5 s. After low-intensity magnetic separation, the iron grade of the concentrate changed to 55.12%, with a recovery rate of 90.34%. The study results provide a reference for the development and application of siderite suspension magnetization roasting technology.     

腹腔镜胆囊切除胆道损伤20例诊治体会

近年来随着腹腔镜胆囊切除术(LC)的广泛开展,胆道损伤呈上升趋势,其发生率为0.4%～1.3%[1].如何避免胆道损伤,成功地进行胆道修复,最大限度地减轻患者的痛苦,是临床医师所面临的重要课题.我们总结了20例腹腔镜胆道损伤的临床资料,报告如下.     

Impact of the COVID-19 Pandemic on Patient Delay and Clinical Outcomes for Patients With Acute Myocardial Infarction

BackgroundIt has been known that the fear of contagion during the coronavirus disease 2019 (COVID-19) creates time delays with subsequent impact on mortality in patients with acute myocardial infarction (AMI). However, difference of time delay and clinical outcome in patients with ST-segment elevation myocardial infarction (STEMI) or non-STEMI between the COVID-19 pandemic and pre-pandemic era has not been fully investigated yet in Korea. The aim of this study was to investigate the impact of COVID-19 pandemic on time delays and clinical outcome in patients with STEMI or non-STEMI compared to the same period years prior.MethodsA total of 598 patients with STEMI (n = 195) or non-STEMI (n = 403) who underwent coronary angiography during the COVID-19 pandemic (February 1 to April 30, 2020) and pre-pandemic era (February 1 to April 30, 2017, 2018, and 2019) were analyzed in this study. Main outcomes were the incidence of time delay, cardiac arrest, and in-hospital death.ResultsThere was 13.5% reduction in the number of patients hospitalized with AMI during the pandemic compared to pre-pandemic era. In patients with STEMI, door to balloon time tended to be longer during the pandemic compared to pre-pandemic era (55.7 ± 12.6 minutes vs. 60.8 ± 13.0 minutes, P = 0.08). There were no significant differences in cardiac arrest (15.6% vs. 10.4%, P = 0.397) and in-hospital mortality (15.6% vs. 10.4%, P = 0.397) between pre-pandemic and the pandemic era. In patients with non-STEMI, symptom to door time was significantly longer (310.0 ± 346.2 minutes vs. 511.5 ± 635.7 minutes, P = 0.038) and the incidence of cardiac arrest (0.9% vs. 3.5%, P = 0.017) and in-hospital mortality (0.3% vs. 2.3%, P = 0.045) was significantly greater during the pandemic compared to pre-pandemic era. Among medications, angiotensin converting enzyme inhibitors/angiotensin type 2 receptor blockers (ACE-I/ARBs) were underused in STEMI (64.6% vs. 45.8%, P = 0.021) and non-STEMI (67.8% vs. 57.0%, P = 0.061) during the pandemic.ConclusionDuring the COVID-19 pandemic, there has been a considerable reduction in hospital admissions for AMI, time delay, and underuse of ACE-I/ARBs for the management of AMI, and this might be closely associated with the excess death in Korea.     

Study on the Material Properties of Microconcrete by Dynamic Model Test

As an important water conveying structure, the seismic safety of the hydraulic aqueduct has attracted considerable interest. Different from the general bridge structure, the seismic analysis of the aqueduct structure needs to consider its fluid–structure interaction. The existing numerical simulation methods cannot truly reflect the fluid–solid coupling mechanism. Therefore, scholars began to use shaking table tests to study the fluid–structure interaction mechanism. However, the research is immature, and it is mostly focused on the seismic response analysis, and there are few studies on the model test similarity ratio and model material properties. Based on this, in this paper, according to the requirements of the test similarity ratio, the orthogonal experiment was used to explore the influence of barite sand content, water–cement ratio, fine sand ratio, and lime ratio on the mechanical properties of microconcrete. The performance indicators of microconcrete under different mix ratios vary widely, with a minimum variation of 19% and a maximum of 102%. Barite sand has the most significant control effect on the density, and the water–cement ratio has the most significant control effect on the compressive strength and elastic modulus. The density variation range is 2.37–2.81 g/cm³, the cube compressive strength variation range is 18.37–36.94 MPa, and the elastic modulus variation range is 2.11 × 10⁴–3.28 × 10⁴ MPa. This study will provide certain evidence for the similarity ratio design and material selection of the scaled model test of the fluid–solid coupling structure.     

失效模式与效应分析在低能X线术中放疗的应用

目的:探讨失效模式与效应分析(FMEA)在低能X线术中放疗(IORT)中的应用,分析其在IORT中的潜在风险,初步探讨FMEA优化IORT管理、减少潜在风险发生的可行性。方法:由IORT团队(1名放疗科医生、1名放疗科物理师、2名外科医生、2名护士)成立FMEA工作小组,应用FMEA方法开展系统风险评估。确立流程模块,...     

蝙蝠葛酚性碱片溶出度方法考察

目的:探讨中药制剂蝙蝠葛酚性碱片的溶出度,为临床用药提供参考。方法:采用紫外分光光度法,分别对其溶出介质、转速进行考察,对累积溶出百分率进行测定,并对3批样品进行均一性试验。结果:蝙蝠葛酚性碱片在45 m in内即溶出70%以上,相对标准偏差在3.0%以内。结论:中药固体制剂蝙蝠葛酚性碱片按照《中国药典》(二部)有关溶出度测定方法控制其内在质量是可行的,可保证临床用药安全、有效。     

蛋白质在膜表面的吸附特性及蛋白质存在的溶液环境对小檗碱膜透过行为的影响研究

为探索蛋白质在膜表面的吸附特性以及蛋白质存在的溶液环境对小檗碱膜透过行为的影响,以蛋白质、小檗碱为研究对象,配制模拟溶液,通过低场核磁共振技术、静态吸附实验以及膜分离实验探究蛋白质与陶瓷膜、小檗碱之间可能存在的相互作用,以蛋白质静态吸附量、膜过程相对通量、蛋白质截留率、小檗碱透过率及两者的吸附率为评价指标,同时测定膜过程中膜污染阻力分布、过膜前后粒径分布变化及膜表面电镜扫描(SEM),研究蛋白质在陶瓷膜上的吸附特性及对小檗碱膜过程的影响。结果表明,陶瓷膜对蛋白质具有吸附作用,且吸附模型符合Langmuir吸附模型,在模拟溶液的膜分离过程中,蛋白质是引起膜污染的主要因素,但在1 g·L~(-1)蛋白质的浓度下,蛋白质的存在对小檗碱的膜过程没有显著影响。     

无痛化脓灸治疗膝关节骨性关节炎疗效观察

目的:观察无痛化脓灸治疗膝关节骨性关节炎的临床疗效,探索一种新疗法。方法:在患者膝关节附近最佳灸位上施无痛化脓灸治疗34例膝关节骨性关节炎患者,采用国际公认的膝关节功能评分表(百分法),对病人治疗前后疼痛、步行、关节屈曲动度、不稳定感、肿胀、上下楼梯和绞锁进行计分以评价治疗效果。结果:治愈10例,显效14例,有效9例,无效1例,总有效率为97.06%。结论:无痛化脓灸疗法治疗膝关节骨性关节炎疗效明显,值得推广应用。     

基于肿瘤能量代谢失衡探讨扶正解毒法在慢性结肠炎“炎癌转化”分期干预中的应用

慢性结肠炎在一定情况下可发生癌转化。慢性结肠炎“炎癌转化”是在线粒体能量代谢损伤、有氧糖酵解代谢上调的机制下,肠道上皮细胞代谢失衡,促使炎症微环境向肿瘤微环境转化的过程。认为由正气虚损而致太阴经、阳明经的寒热分离是结肠炎癌转化的触发机制,由邪毒鸱张诱发的气机升降失调是打破促瘤抑瘤平衡,进而邪聚成瘤的关键。临床治疗上应在中医恒动观理论指导下分清慢性结肠炎炎癌转化的不同阶段,灵活把握扶正与解毒的主次,改善肠道炎性环境,调节异常能量代谢,以延缓恶化时间,截断炎癌转化的进程。     

鸦胆子乳剂、5-Fu局部注射联合开道散对人胃癌裸鼠移植瘤的抗肿瘤机制研究

目的研究鸦胆子乳剂、5-Fu局部瘤体注射联合灌服开道散对人胃癌SGC-7901移植瘤的抑制作用及可能机制。方法建立人胃癌SGC-7901裸鼠移植瘤模型后传3代,接种于裸小鼠右前肢腋窝皮下,待肿瘤生长至50-250mm3后随机分6组：对照组A组（0.9%NaCl溶液）,治疗组B（5-FU）组、C组（5-FU及鸦胆子乳）、D组（开道散联合5-FU）、E组（开道散联合5-FU、鸦胆子乳）、F组（开道散）。实验期间,每周测量两次瘤体体积,给药结束,将动物脱颈处死,剥离出肿块称重,比较各组肿瘤重量,计算肿瘤抑制百分率;用免疫组化方法检测荷瘤组织中p53、Ki67表达情况。结果除F组瘤重与对照组比较无统计学意义（P〉0.05）,余各治疗组瘤重均显著低于对照组,但治疗组间C组、D组与B组比较无统计学意义（P〉0.05）,而E组与B组相比有统计学意义（P〈0.05）;除F组外,其余各治疗组均有不同程度下调p53、Ki67表达,与对照组比较差异有统计学意义（P〈0.05）,但C组、D组与B组比较各免疫组化指标表达无明显差异（P〉0.05）,而E组较B组各免疫组化指标下调明显,有统计学意义（P〈0.05）。结论瘤体内注射鸦胆子乳剂、5-Fu联合灌服开道散有一定的协同增效作用,其机制可能与抑制p53、Ki67表达,抑制肿瘤细胞的生长与增殖有关。