Experiments were carried out to study the transformation of mercury in soils. Results showed that Hg 2+ was immediately converted into other forms once it entered into soils. Bentonite, humus or CaCO 3 accelera...Experiments were carried out to study the transformation of mercury in soils. Results showed that Hg 2+ was immediately converted into other forms once it entered into soils. Bentonite, humus or CaCO 3 accelerated the transformation of Hg 2+ by various mechanisms. Bentonite could convert Hg 2+ into residual form eventually, and application of CaCO 3 enhanced the formation of inorganic Hg. Humus competed strongly with clay minerals for binding Hg 2+ , thus increase of soil humus content led to increased formation of organically bound Hg.展开更多
利用三聚氰胺和碳酸钙成功合成了一种新型吸附剂CaCO 3/g-C 3 N 4。通过XRD,FT-IR,SEM,TEM和BET对CaCO 3/g-C 3 N 4的结构进行深入研究。实验结果表明:CaCO 3/g-C 3 N 4对结晶紫(CV)具有快速、高效的吸附性能(89.34%)和出色的吸附容量(1...利用三聚氰胺和碳酸钙成功合成了一种新型吸附剂CaCO 3/g-C 3 N 4。通过XRD,FT-IR,SEM,TEM和BET对CaCO 3/g-C 3 N 4的结构进行深入研究。实验结果表明:CaCO 3/g-C 3 N 4对结晶紫(CV)具有快速、高效的吸附性能(89.34%)和出色的吸附容量(1209.75 mg/g)。CaCO 3/g-C 3 N 4对CV的吸附符合准二级动力学和Langmuir等温吸附模型。同时,基于吸附前后吸附剂的FT-IR和XPS分析,得出π-π堆积,n-π相互作用和氢键协同效应是CaCO 3/g-C 3N 4选择性吸附CV的重要因素。展开更多
The pearl or nacreous layer of mollusk shell is composed of CaCO 3 aragonite crystals. The factors affecting their color are very complex, such as metal elements, chromoprotein, and nucleation materials. we analyzed ...The pearl or nacreous layer of mollusk shell is composed of CaCO 3 aragonite crystals. The factors affecting their color are very complex, such as metal elements, chromoprotein, and nucleation materials. we analyzed the crystal orientation of nacreous layers with different color prepared from fresh water clams Hyriopsis cumingii Lea by X ray diffraction . The results show that the crystal CaCO 3 orientation on specific plane is responsible for the color of pearl and nacreous pearl color.展开更多
To make heavy calcium carbonate filled UHMW PVC rigid sheet, the calcium carbonate powder is activated in a specially designed fine grinding activation equipment (SM 10) by adding rare earth aluminate coupling age...To make heavy calcium carbonate filled UHMW PVC rigid sheet, the calcium carbonate powder is activated in a specially designed fine grinding activation equipment (SM 10) by adding rare earth aluminate coupling agent. The calcium carbonate powder is ground to micron order. The activated calcium carbonate filler shows excellent properties when it is added to UHMW PVC, since the activated powder surface has strong compatibility with polymer. At a filling rate of 70 [KG-*3/4]phr (per hundred resin), the impact strength with U notch is above 7kJ/m 2 and the tensile strength is above 20 MPa. The fine grinding activation and PVC sheet pressing process are given. Both the influence of the amount of plasticizer and coupling agent on the mechanical properties and the influence of filling rate on PVC rigid sheet are discussed. 展开更多
The thermal behavior and kinetic parameters of decomposition reaction of limestone in a temperature-programmed mode were investigated by means of TG. The experimental results show that the kinetic model functions in d...The thermal behavior and kinetic parameters of decomposition reaction of limestone in a temperature-programmed mode were investigated by means of TG. The experimental results show that the kinetic model functions in different forms for the thermal decomposition reactions of different limestone grain sizes in dispersing state under the atmosphere of static air are 4(1-α) 3/4 for small size limestone and (1-α) for large size limestone. Information was obtained on the relationship among the decomposition temperature, decomposition time, decomposition fraction, decomposition reaction rate constant and grain size of limestone.展开更多
文摘Experiments were carried out to study the transformation of mercury in soils. Results showed that Hg 2+ was immediately converted into other forms once it entered into soils. Bentonite, humus or CaCO 3 accelerated the transformation of Hg 2+ by various mechanisms. Bentonite could convert Hg 2+ into residual form eventually, and application of CaCO 3 enhanced the formation of inorganic Hg. Humus competed strongly with clay minerals for binding Hg 2+ , thus increase of soil humus content led to increased formation of organically bound Hg.
文摘为保证Web服务组合满足用户对Web服务质量日益增长的需求,提出了基于体验质量(Quality of Experience,Qo E)的Web服务组合优化方法,即建立模糊专家系统(Fuzzy Expert System)Qo E评估模型,并转化为Web服务组合优化的数学模型,采用混沌蚁群算法(Chaos Ant Colony Optimization,CACO)进行Web服务组合优化求解。该方法利用混沌算法的遍历性、随机性和规律性,通过引入混沌扰动来避免优化过程中出现局部最优解,以期获得服务组合的全局最优解。为验证CACO算法的可行性和有效性,对其与人工蜂群算法(ABC)、粒子群算法(PSO)和原始蚁群算法(ACO)等进行了同步对比实验。实验结果表明,CACO算法相比其他算法具有运行时间短、收敛速度快且稳定性高的优点,具有较好的发展前景。
文摘The pearl or nacreous layer of mollusk shell is composed of CaCO 3 aragonite crystals. The factors affecting their color are very complex, such as metal elements, chromoprotein, and nucleation materials. we analyzed the crystal orientation of nacreous layers with different color prepared from fresh water clams Hyriopsis cumingii Lea by X ray diffraction . The results show that the crystal CaCO 3 orientation on specific plane is responsible for the color of pearl and nacreous pearl color.
文摘To make heavy calcium carbonate filled UHMW PVC rigid sheet, the calcium carbonate powder is activated in a specially designed fine grinding activation equipment (SM 10) by adding rare earth aluminate coupling agent. The calcium carbonate powder is ground to micron order. The activated calcium carbonate filler shows excellent properties when it is added to UHMW PVC, since the activated powder surface has strong compatibility with polymer. At a filling rate of 70 [KG-*3/4]phr (per hundred resin), the impact strength with U notch is above 7kJ/m 2 and the tensile strength is above 20 MPa. The fine grinding activation and PVC sheet pressing process are given. Both the influence of the amount of plasticizer and coupling agent on the mechanical properties and the influence of filling rate on PVC rigid sheet are discussed.
文摘The thermal behavior and kinetic parameters of decomposition reaction of limestone in a temperature-programmed mode were investigated by means of TG. The experimental results show that the kinetic model functions in different forms for the thermal decomposition reactions of different limestone grain sizes in dispersing state under the atmosphere of static air are 4(1-α) 3/4 for small size limestone and (1-α) for large size limestone. Information was obtained on the relationship among the decomposition temperature, decomposition time, decomposition fraction, decomposition reaction rate constant and grain size of limestone.
