Macroporous weak basic anion exchanger （D301R） was used to remove organic substances from drilling wastewater. The effect of pH, temperature and contact time on adsorption behavior was investigated in batch experime...Macroporous weak basic anion exchanger （D301R） was used to remove organic substances from drilling wastewater. The effect of pH, temperature and contact time on adsorption behavior was investigated in batch experiments, which indicated that the COD （Chemical Oxygen Demand） removal ratio of drilling wastewater was approximately 90%, and the COD of treated wastewater was below 70 mg/L under appropriate operating conditions. A mixed liquor of NaOH and NaCI was selected as desorbent because of its better elution performance. The results of column dynamic adsorption and regeneration showed that the COD of wastewater could be efficiently removed by D301R resin, and the resin was easily regenerated by the selected desorbent.展开更多
In this paper, a disease transmission model with two treatment stages is proposed and analyzed. The results indicate that the basic reproduction number is a critical threshold for the prevalence of the disease. If the...In this paper, a disease transmission model with two treatment stages is proposed and analyzed. The results indicate that the basic reproduction number is a critical threshold for the prevalence of the disease. If the basic reproduction number is less than one, the disease free equilibrium is globally asymptotically stable. Otherwise, the endemic equilibrium is globally asymptotically stable. Therefore, besides the basic reproduction number, a new marker for characterizing the seriousness of the disease, named as dynamical final infective size, is proposed, which differs from traditional final size because the proposed model includes the natural birth and death. Finally, optimization strategies for limited medical resources are obtained from the perspectives of basic reproduction number and dynamical final infective size, and the real-world disease management scenarios are given based on these finding.展开更多
目的探讨宿迁地区基层胸痛中心发病至送达胸痛中心大门(symptom onset to door,StoD)时间的影响因素及对策。方法选择2022年1月—2023年6月宿迁市中西医结合医院胸痛中心收治的81例急性心肌梗死患者为研究对象。根据患者StoD时间分为≤...目的探讨宿迁地区基层胸痛中心发病至送达胸痛中心大门(symptom onset to door,StoD)时间的影响因素及对策。方法选择2022年1月—2023年6月宿迁市中西医结合医院胸痛中心收治的81例急性心肌梗死患者为研究对象。根据患者StoD时间分为≤6 h组50例与>6 h组31例。统计人口学资料以及相关影响因子,利用单因素分析与多因素logistic回归分析胸痛中心StoD时间的影响因素。结果2组疼痛程度评分、通过120入院还是自行来院、社区医生是否通过网络将心电图结果传输至胸痛中心、发病症状是否典型、家属态度是否积极、有无心血管疾病危险因素、是否夜间发病、发病地点与就诊医院的距离等指标比较,差异有统计学意义(P<0.05)。单因素分析及多因素logistic回归分析显示,自行来院、发病症状不典型、有心血管疾病危险因素、夜间发病、发病地点与就诊医院距离远均是胸痛中心StoD时间的危险因素,家属态度积极为保护因素(P<0.05)。结论基层胸痛中心StoD时间受患者来院途径、症状表现以及发病时间等影响,而家属积极态度有利于缩短StoD时间,需提高家属对疾病的认识,发挥区域诊疗中心协同救治的作用,缩短StoD时间及提高救治效率。展开更多
文摘Macroporous weak basic anion exchanger （D301R） was used to remove organic substances from drilling wastewater. The effect of pH, temperature and contact time on adsorption behavior was investigated in batch experiments, which indicated that the COD （Chemical Oxygen Demand） removal ratio of drilling wastewater was approximately 90%, and the COD of treated wastewater was below 70 mg/L under appropriate operating conditions. A mixed liquor of NaOH and NaCI was selected as desorbent because of its better elution performance. The results of column dynamic adsorption and regeneration showed that the COD of wastewater could be efficiently removed by D301R resin, and the resin was easily regenerated by the selected desorbent.
文摘In this paper, a disease transmission model with two treatment stages is proposed and analyzed. The results indicate that the basic reproduction number is a critical threshold for the prevalence of the disease. If the basic reproduction number is less than one, the disease free equilibrium is globally asymptotically stable. Otherwise, the endemic equilibrium is globally asymptotically stable. Therefore, besides the basic reproduction number, a new marker for characterizing the seriousness of the disease, named as dynamical final infective size, is proposed, which differs from traditional final size because the proposed model includes the natural birth and death. Finally, optimization strategies for limited medical resources are obtained from the perspectives of basic reproduction number and dynamical final infective size, and the real-world disease management scenarios are given based on these finding.
