Non-tuberculosis extensive abdominal lymph node calcification leading to portal hypertension with esophageal and gastric variceal bleeding: a rare case report.

BACKGROUND: Calcification of abdominal lymph node is a common clinical phenomenon, but it is extremely rare to cause serious adverse clinical outcomes. In the present case, the ruptured hemorrhage of the oesophagogastric fundic varices occurred as a result of portal hypertension due to compression of the portal vein by calcified lymph nodes. The patient was treated with medication, interventional therapy, endoscopic therapy, and surgery, respectively and the four different treatment options for the bleeding are worth summarizing. The etiology of this case is extremely rare and is the first to be reported in the world. CASE PRESENTATION: A 32-year-old male patient with no apparent causes of sudden onset of vomiting of blood, the patient underwent four different treatment methods to stop the hemorrhage. The combined diagnosis of whole abdomen enhanced CT and angiography was calcified abdominal lymph nodes compressing the portal vein, leading to portal hypertension and resulting in esophageal and gastric variceal bleeding. Postoperatively, a biopsy of the caseous tubercular tissue of the abdominal wall observed intraoperatively was performed and the biopsy did not show a tubercular component. Therefore, the extensive intra-abdominal lymph node calcification was not associated with tuberculosis. The patient's bleeding ceased after surgery. CONCLUSION: This case has improved the clinician's understanding of the etiology of non-cirrhotic portal hypertension. Based on this, and with this case, the differences between various hemostatic measures were studied in depth.

Weight Adaptive Path Tracking Control for Autonomous Vehicles Based on PSO-BP Neural Network.

In order to improve the tracking adaptability of autonomous vehicles under different vehicle speeds and road curvature, this paper develops a weight adaptive model prediction control system (AMPC) based on PSO-BP neural network, which consists of a dynamics-based model prediction controller (MPC) and an optimal weight adaptive regulator. Based on the application of MPC to achieve high-precision tracking control, the optimal weight under different operating conditions obtained by automated simulation is used to train the PSO-BP neural network offline to achieve online adjustment of MPC weight. The validation results of the Prescan-Carsim-Simulink joint simulation platform show that the adaptive control system has better tracking adaptation capability compared with the original classical MPC control. The control strategy was also verified on an autonomous vehicle test platform, and the test results showed that the adaptive control strategy improved tracking accuracy while meeting the vehicle's requirements for real-time control and lateral stability.

Head-and-face anthropometric survey of Chinese workers.

Millions of workers in China rely on respirators and other personal protective equipment to reduce the risk of injury and occupational diseases. However, it has been >25 years since the first survey of facial dimensions for Chinese adults was published, and it has never been completely updated. Thus, an anthropometric survey of Chinese civilian workers was conducted in 2006. A total of 3000 subjects (2026 males and 974 females) between the ages of 18 and 66 years old was measured using traditional techniques. Nineteen facial dimensions, height, weight, neck circumference, waist circumference and hip circumference were measured. A stratified sampling plan of three age strata and two gender strata was implemented. Linear regression analysis was used to evaluate the possible effects of gender, age, occupation and body size on facial dimensions. The regression coefficients for gender indicated that for all anthropometric dimensions, males had significantly larger measurements than females. As body mass index increased, dimensions measured increased significantly. Construction workers and miners had significantly smaller measurements than individuals employed in healthcare or manufacturing for a majority of dimensions. Five representative indexes of facial dimension (face length, face width, nose protrusion, bigonial breadth and nasal root breadth) were selected based on correlation and cluster analysis of all dimensions. Through comparison with the facial dimensions of American subjects, this study indicated that Chinese civilian workers have shorter face length, smaller nose protrusion, larger face width and longer lip length.