Surface deformation and fracture processes of materials under external force are important for understanding and developing materials. Here, a combined horizontal universal mechanical testing machine (HUMTM)-atomic force microscope (AFM) system is developed by modifying UMTM to combine with AFM and designing a height-adjustable stabilizing apparatus. Then the combined HUMTM-AFM system is evalua...

To the Editor: I have read the article “Progression of a fracture site impaction as a prognostic indicator of impacted femoral neck fracture treated with multiple pinning” by Yoon et al. in the current issue of your esteemed journal and congratulate the authors. Yet, I would like to elaborate on a few important relevant concepts in the same regard. Th e authors have not considered the other vec...

Development of unconventional shale gas reservoirs (SGRs) has been boosted by the advancements in two key technologies: horizontal drilling and multi-stage hydraulic fracturing. A large number of multi-stage fractured horizontal wells (MsFHW) have been drilled to enhance reservoir production performance. Gas flow in SGRs is a multi-mechanism process, including: desorption, diffusion, and non-Da...

When fractures are vertical, aligned and their dimensions are small relative to the seismic wavelength, the medium can be considered to be an equivalent Horizontal Transverse Isotropic (HTI) medium. However, geophysical data acquired over naturally fractured reservoirs often reveal the presence of multiple fracture sets. We investigate a case where there are two vertical sets of fractures havin...

We present a contribution on the risk of hydraulic fracturing in CO2 geological storage using an analytical model of hydraulic fracturing in weak formations. The work is based on a MohrCoulomb dislocation model that is extended to account for material with fracture toughness. The complete slip process that is distributed around the crack tip is replaced by superdislocations that are placed in t...

OBJECTIVE To construct, propose, and evaluate the usefulness of a new clinical facial fracture classification scheme to accurately denote, communicate, and compare facial fractures. DESIGN A retrospective, consecutive sample study with application of the proposed classification scheme to denote maxillary and zygomatic fractures with computed tomography. SETTING Metropolitan tertiary care tr...

Root fracture is a rarely seen traumatic injury in permanent dentition. It has prevalence of 0.5-7 %. Tooth survival significantly affected by the type healing and location root fracture. Additionally, patient’s age, stage development, mobility dislocation coronal fragment, diastasis between fragments following this kind are among important factors.
 In case presentation, management with M...