阐述了决定断裂封闭性能的力学和化学因素.力学因素包括岩石破裂性质,断面正应力和断裂变形机制,其影响规律为:①岩石破裂性质和断面正应力决定了断裂的开敞程度;②三维应力实验已证实随温压升高,变形程度加深,而孔隙度和渗透率递减,但低压脆性变形中存在膨胀扩容阶段,并且膨胀扩容程度随有效应力增加而减小.化学因素包括化学...
Recycling cycles cause a decrease in mechanical paper properties due to cellulose fiber degradation. The use of cellulose micro/nanofibers (CMF/CNF) to reinforce paper strength has been well studied, although it has been found to have negative effects on
The difference stems from groundwater inputs, man-made dams and other sedimentary traps. If the relevancy of the steady state model of erosion can be questioned, the accuracy of sediment load measurements is also questionable. Pros and cons of both methods are argued. The calculated solid loads...
We also revealed a functional role of protrusions in integrating chemical and mechanical stimuli. At the molecular level, stiff matrices cause clustering of integrins49, which recruit RasGEFs to the membrane through a pathway involving FAK, Src, Fyn, or Shc32. Consistently, we found that FAK is...
The push-out strength of the hydrothermally treated film resulted from the chemical bonding of the bone–HA layer interface, while that of the untreated film resulted from mechanical interlocking force between bone and the microprojections. There was a small difference in bone apposition but no ...
PURPOSE: A chemical and mechanical polishing device and a polishing method are provided to minimize a thickness difference between the center part and the edge part of a wafer.;CONSTITUTION: A chemical and mechanical polishing device(100) comprises a measuring unit(110), a controller, and a poli...
This article presents a comprehensive study on the physical, mechanical, thermal, and chemical properties of polypropylene (PP) composites reinforced with hemp fibers (HF) and compatibilized with maleic anhydride (MAPP). The composites were processed using a twin-screw extruder, followed by hot com...
In addition, the setting times of EC, DR, and RM were shorter than that of PR (p < 0.05). The solubility was not significantly different among all groups. The three relatively new MTA groups (EC, DR, and RM) exhibited a significant difference in pH variation and calcium ion release ...
The difference among the elastic behavior of ceramic materials, metals, and polymers is mainly due to the different chemical bonds involved in the structure of the material and to atomic arrangement. When a solid is exposed to an uniaxial stress, it undergoes a deformation in the direction of ...
The osmotic suction and, consequently, the chemical environment of the bentonite, significantly influence its performance at full saturation. The equilibration of the bentonite's porewater with a new external porewater chemistry changes its swelling pressure, pore size distribution, and therefore, its ...