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The effect of irradiation by electron beam with dose of 10-80 kGy on the properties of a number of semicrystalline polymers preliminary subjected to severe plastic deformation (SPD) was studied. SPD up to 8.5 was produced by equal-channel multiple-angular extrusion process. It was demonstrated that polymers capable for radiation hardening (such as high density polyethylene, Nylon-6) show an increase of stiffness and strength, the ductility remains at a non-irradiated polymer as well as retain low values of the effective coefficient of thermal expansion at the level of invar alloys. At the same time radiation softening is much weaker in the case of SPD processed polymers (such as polytetrafluoroethylene). The magnitude of the effect depends on the irradiation dose and the type of the polymer. The achieved effects are associated with the processes of radiation cross-linking, destruction and chemical crystallization.
Humans are capable of generating simulated mental worlds based on their past experiences and use such an environment for prospecting, planning, and learning. Such capabilities could enhance current robotic systems, allowing them to plan ahead based on predicted outputs, and even compare their performance with a different agent. In this work, we propose a semantic robot modeling framework, which is able to express intrinsic semantic knowledge in order to better represent the robot and its surrounding environment. We also show that such data can be used to automatically generate a simulated model, allowing robots to simulate themselves and other modeled agents.
We report a rare case of vesico-acetabular fistula due to an improperly treated pelvic fracture with urinary stone formation in the joint cavity. This complication was related to an unrecognized mechanism of bladder wall entrapment in the acetabular floor defect during weight bearing. This situation led to several mistreatment decisions in our case and should be always considered by urologists dealing with patients after major pelvic trauma. In this case report, we analyze the publications related to this problem, discuss the main mechanisms of bladder wall damage after acetabular fracture, and propose tips for diagnosis and treatment.
Cerebral venous sinus thrombosis (CVST) is an uncommon cause of cerebral infarction, compared to arterial diseases. It is often unrecognized at initial presentation due to the diversity of causes and clinical manifestations. A 29-year-old female patient complained of severe headache and presented at the emergency room with altered consciousness. Brain computed tomography and brain magnetic resonance image revealed the left sigmoid sinus thrombosis with venous hemorrhagic infarction (VHI) in the left temporal lobe. The patient had no past medical and family history of bleeding diathesis. The laboratory finding at the admission showed severe iron-deficiency anemia (IDA), and protein C and S activities were decreased. After the neurosurgery, iron replacement, and neurorehabilitation, the patient had a good recovery. There has been no known recurrence. We report our therapeutic intervention on a very rare case of CVST and VHI, with IDA as a probable cause of cerebral thrombosis.
Yuri,Cho,Jeong-Hoon,Lee,Dong,Hyeon,Lee,Hyeki,Cho,Hongkeun,Ahn,Minjong,Lee,Jeong-ju,Yoo,Won-mook,Choi,Young,Youn,Cho,Yun,Bin,Lee,Su,Jong,Yu,Nam-Joon,Yi,Kwang-Woong,Lee,Seoung,Hoon,Kim,Jong,Man,Kim,Jae- 한국간담췌외과학회 2014 한국간담췌외과학회 학술대회지 Vol.2014 No.4