Research progress on the association between environmental pollutants and the resistance mechanism of PARP inhibitors in ovarian cancer

Environmental Science and Pollution Research - The occurrence and progression of ovarian cancer are closely related to genetics and environmental pollutants. Poly(ADP-ribose) polymerase (PARP)...     

赣江主要河流丰水期-枯水期氮磷营养盐分布特征

对2006—2019年赣江水体及水库丰水期-枯水期的总氮(TN)、氨氮(NH₃-N)、硝态氮(NO^-₃-N)和总磷(TP)浓度变化和分布特征进行分析。将赣江按河谷地形和河道特征划分为上游、中游、下游3段;根据水流来源将赣江划分为章水、桃江、湘水、贡水、泸江、赣江干流。结果显示：桃江TN质量浓度在2011年枯水期取得最大值8.26 mg/L;章水TP质量浓度在2007年枯水期取得最大值0.18 mg/L,整个赣江丰水期-枯水期的TP质量浓度在0.02～0.18 mg/L范围内浮动,变化幅度较小;章水NH₃-N浓度在2008年枯水期取得最大值1.86 mg/L,而在2017—2019年NH₃-N的浓度基本处于0.5 mg/L以内,达到《地表水环境质量标准》(GB 3838—2002)Ⅲ类水质标准。万安水库和峡江水库对总氮的滞留率,丰水期分别为24.26%、17.44%,枯水期分别为21.36%、16.60%;对总磷的滞留率,丰水期分别为24.78%、19.05%,枯水期分别为33....     

Heat transfer analysis of cylindrical anaerobic reactors with different sizes: a heat transfer model

The temperature is the essential factor that influences the efficiency of anaerobic reactors. During the operation of the anaerobic reactor, the fluctuations of ambient temperature can cause a change in the internal temperature of the reactor. Therefore, insulation and heating measures are often used to maintain anaerobic reactor’s internal temperature. In this paper, a simplified heat transfer model was developed to study heat transfer between cylindrical anaerobic reactors and their surroundings. Three cylindrical reactors of different sizes were studied, and the internal relations between ambient temperature, thickness of insulation, and temperature fluctuations of the reactors were obtained at different reactor sizes. The model was calibrated by a sensitivity analysis, and the calibrated model was well able to predict reactor temperature. The Nash-Sutcliffe model efficiency coefficient was used to assess the predictive power of heat transfer models. The Nash coefficients of the three reactors were 0.76, 0.60, and 0.45, respectively. The model can provide reference for the thermal insulation design of cylindrical anaerobic reactors.