Experimental research and application of drilling and blasting with directional damage-reduction shaped charge.

In this research, a directional reduction charging structure was proposed to solve the problems caused by drilling and blasting method such as serious damage to surrounding rocks, working face low contour flatness and serious over-under break of root base c. Drilling and blasting tests, numerical calculations and field applications were designed and performed for the verification of the blasting advantages of charge structure. Test results showed that the peak positive strain along the protection direction of directional protection shaped charge was significantly smaller than that of ordinary charge, where PVC material presented the strongest effect such that the peak positive strain of specimen 1 at measuring point 4 (protection direction) was only 0.

Research on directional rock blasting based on different slotted pipe materials of the combined charge structure.

For shaped charge blasting projects in mining, civil engineering, and similar fields, it is proposed to modify the charge structure by combining slotted tubes and shaped charge liners to obtain a new type of charge structure. This aims to achieve directional rock breaking through the focused action of the shaped charge. The influence of different slotted pipe materials on the directional rock-breaking effect of concentrated energy using a new charge structure is explored through theoretical analysis combined with model test study, high-speed camera, stress-strain gauge, and other equipment.

Non-ST elevation myocardial infarction induced by carbon monoxide poisoning: A case report.

Rationale: Acute myocardial infarction is a rare complication of carbon monoxide poisoning. there is often no chest pain and other typical manifestations. We report a patient with mild carbon monoxide poisoning who had acute dyspnea as the earliest symptom and was later diagnosed with non-ST elevation myocardial infarction (NSTEMI) and acute left heart failure.

Analysis of combined detection of N-terminal pro-B-type natriuretic peptide and left ventricular ejection fraction in heart function in patients with acute CO poisoning.

Objective: N-terminal pro-B-type natriuretic peptide (NT-proBNP) has been used in the evaluation on heart function in many heart diseases. However, little is known in patients with acute carbon monoxide poisoning (ACOP). Left ventricular ejection fraction (LVEF) can be applied as a preliminary test method to measure the left ventricular function.

Diffusion tensor imaging for predicting the clinical outcome of delayed encephalopathy of acute carbon monoxide poisoning.

Objective: The aim of the present study was to determine the relationship between neuropsychiatric outcomes and diffusion tensor imaging (DTI) in patients with delayed encephalopathy after acute carbon monoxide poisoning (DEACMP).

Methods And Materials: 66 patients and 60 healthy controls were included in this study. Median fractional anisotropy (FA) of the white matter (WM) bilaterally was compared between patients and healthy controls.

[Quantitative study of therapeutic efficacy on early intervention of hyperbaric oxygen to model of steroid-induced avascular osteonecrosis of femoral head by multi-slice perfusion imaging].

Objective: To quantitatively evaluate the hemodynamic status in animal models of steroid-induced avascular osteonecrosis of femoral head (SANFH) by multislice CT (MSCT) perfusion imaging, and estimate the therapeutic efficacy on early intervention of hyperbaric oxygen (HBO) to improve the region blood flow (rBF) of ischemic femoral head.

Methods: Forty-eight New Zealand male rabbits were injected with Escherichia coli endotoxin and methyl-prednisolone to establish SANFH models and then divided into 3 subgroups to undergo MSCT to measure the rBF, regional blood volume (rBV), and mean transit time (MTT) to obtain perfusion maps at the femoral head epiphysis, metaphysic, and neck of femur, and then were killed to undergo histological examination of the bilateral femoral heads 2, 4, and 6 weeks later respectively (Groups M(2), M(4), and M(6)). Twenty-four rabbits underwent HOB treatment after the second injection of E.

Clinical study on the related markers of blood coagulation in the patients with ANFH after SARS.

The aim of this research was to investigate the blood coagulation function in the patients with avascular necrosis of the femoral head (ANFH) after severe acute respiratory syndrome (SARS). The expression of CD31, CD61, CD62p, CD63 and PAC-1 on platelet membrane was measured respectively by flowcytometry, and the plasma prothrombin time (PT), activated partial thromboplastin time (APTT), thrombin time (TT) and fibrinogen (Fbg) were measured by blood clotting instrument in 26 patients with ANFH after SARS and in 17 healthy adults. The expression of CD31, CD61, CD 62p, CD63 and PAC-1 on platelet membrane in 26 patients was all lower than that in 17 healthy subjects (P < 0.

[Prevention and treatment of complications after duodenopancreatectomy].

Objective: To analyze the causes of the complications following duodenopancreatectomy and their prevention and treatment.

Methods: The clinical data of 36 cases receiving duodenopancreatectomy during the last decade were analyzed, including 13 cases of ampullary carcinoma, 8 cases of carcinoma of the pancreas head, 8 cases of distal cholangiocarcinoma, and 7 cases of carcinoma of the duodenal papilla.

Results: Complications occurred in 6 cases after duodenopancreatectomy including pancreatic fistula in 3 cases, bile duct fistula in 1 case, abdominal cavity hemorrhage in 1 case, and alimentary tract hemorrhage in 1 case, with an incidence rate of postoperative complications of 16.