Using the techniques of X-ray diffraction, polarizing microscopy, uniaxial compression, and scanning electron microscopy (SEM), relationships between microfracture features mineral morphology granite were studied. The results showed that feldspar, quartz, biotite are main components samples in this study. Biotite has a self-shaped flake structure with perfect cleavage. K-feldspar lattice double...

Tight hydrocarbon reservoirs require stimulation to improve the recovery of oil and gas resources. Hydraulic fracturing is a technique extensively employed in industry generate fractures including primary secondary fractures. To keep these open, proppants are used. However, some ractures very narrow for conventional penetrate prop, hence smaller called micro-proppants required. These can hydrau...

Since shale gas mainly occurs in pores, research on pore structure characteristics is the key to understanding accumulation mechanism. The of Lower Carboniferous Dawuba Formation Qianxi area, represented by well QSD-1, which obtains a daily flow 10,000 m3 and represents an important breakthrough investigation marine Upper Paleozoic region southern China, characterized high-pressure mercury comp...

Conventional hydraulic fracturing techniques typically consume large amounts of water when producing shale gas. Fracking fluids may cause environmental pollution. In contrast, supercritical carbon dioxide (scCO2) (above 31.8°C, 7.29 MPa) can displace CH4 in reservoirs. Achieve CO2 sequestration while increasing the gas production. We studied mechanical properties and fracture characteristics a ...

The aim of the present work was the evaluation of implant stability and periimplant bone reaction by histologic and clinical evaluation after therapeutic orthodontic loads. Forty-one adult patients received titanium implants as an orthodontic anchorage device; 12 patients received a retromolar or palatal implant to obtain tooth movement. Seven implants were removed at the end of the orthodontic...

BACKGROUND Numerous surgical options exist to treat chondral lesions in the knee, including microfracture (MFx), osteochondral autograft transplantation (OAT), first-generation autologous chondrocyte implantation (ACI-1), and next-generation ACI (ACI-2). PURPOSE To compare the cost-effectiveness of MFx, OAT, and ACI-1. The secondary purpose of this study was to compare the functional outcomes...

Microfracture repair tissue in young adult humans and in rabbit trochlea is frequently of higher quality than in corresponding ovine or horse models or in the rabbit medial femoral condyle (MFC). This may be related to differences in subchondral properties since repair is initiated from the bone. We tested the hypothesis that subchondral bone from rabbit trochlea and the human MFC are structura...

UNLABELLED Caloric restriction prolongs life span. Calcium restriction may preserve bone health. In osteoporosis, bone mineral density (BMD) has significantly decreased, due to a lack of osteoblast bone formation. Traditional osteoporosis prevention is aimed at maximizing BMD, but the lifetime effects of continuously maintaining a high BMD on eventual bone health in old age, have not been studi...

The seepage characteristics during the complete stress–strain process of limestone under high water pressure were simulated via an experimental study post-peak penetrating behavior, and approach to predict formation channel, namely, acoustic emission positioning technology, is proposed. results showed that (1) whether in experiment or numerical simulation, sudden drop curve after peaking indica...