Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-05-18
Abstract： [Background] Due to the independence of traditional neutron and density measurement instruments, in order to improve the safety and efficiency of geological information.[Purpose]Integrate the design of existing neutron and density instruments to merge the neutron density components And analyze in detail the gamma influencing factors in integrated design.[Methods] In order to investigate the influence of the distance between neutron and gamma sources on detector measurements, Monte Carlo simulation was used to analyze detector counts and energy spectra at different distances between neutron and gamma sources, and the results were validated under different rock and density conditions.[Results] Keeping the true instrument source distance, neutron source intensity and other parameters unchanged, the neutron radiation field has no significant impact on the density measurement results when the neutron and gamma sources are 410mm apart, and the absolute error of the inversion density is less than 0.015g/cm3. By changing the neutron source intensity to explore the impact of source intensity on integrated research, and simulating multiple neutron sources with different intensities, it can be found that as the neutron source intensity gradually increases, the optimal distance between the neutron source and gamma source gradually increases and presents a quadratic function relationship.[Conclusions] Based on such findings, the distance between the two sources can be flexibly determined based on the strength of the neutron source, enabling rapid performance evaluation of on-site instrument testing and providing theoretical guidance for integrated design.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-05-07
Abstract： [Background]: With the deepening of oil and gas exploration, the research on the design and measurement methods of X-ray density logging tools, as a new generation of controllable sources, has attracted widespread attention. [Purpose]: Based on the prototype of ultra-slim gamma logging tool, the gamma source is replaced with an X-ray source. [Methods]: The specific content includes: 1) simulating and matching the energy spectrum of the X-ray source; 2) comprehensively guiding the forward design of the key parameters of the tool through indicators such as detection efficiency, formation sensitivity, and detection depth; 3) conducting X-ray density measurements based on the multivariate forward and inverse modeling method, and comparing them with gamma density logging results. [Results]: The results show that when the short and long-spaced detectors’ source distances of the X-ray tool are set to 110mm and 290mm, it can achieve comparable or even higher detection indicators compared to gamma tool. Compared with gamma logging, X-ray logging has better formation sensitivity, vertical resolution, and formation measurement accuracy. The formation density and Pe are within 0.015g/cm3 and 0.2b/e, respectively. Especially in the barite mudcake scenario, the accuracy of Pe measurement has been improved by 47%. [Conclusions]: These studies provide reference for tool forward design and X-ray density measurement.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-05-06
Abstract： [Background]: With the deepening of oil and gas exploration, the research on the design and measurement methods of X-ray density logging tools, as a new generation of controllable sources, has attracted widespread attention. [Purpose]: Based on the prototype of ultra-slim gamma logging tool, the gamma source is replaced with an X-ray source. [Methods]: The specific content includes: 1) simulating and matching the energy spectrum of the X-ray source; 2) comprehensively guiding the forward design of the key parameters of the tool through indicators such as detection efficiency, formation sensitivity, and detection depth; 3) conducting X-ray density measurements based on the multivariate forward and inverse modeling method, and comparing them with gamma density logging results. [Results]: The results show that when the short and long-spaced detectors’ source distances of the X-ray tool are set to 110mm and 290mm, it can achieve comparable or even higher detection indicators compared to gamma tool. Compared with gamma logging, X-ray logging has better formation sensitivity, vertical resolution, and formation measurement accuracy. The formation density and Pe are within 0.015g/cm3 and 0.2b/e, respectively. Especially in the barite mudcake scenario, the accuracy of Pe measurement has been improved by 47%. [Conclusions]: These studies provide reference for tool forward design and X-ray density measurement.
Subjects: Nursing >> Nursing submitted time 2023-06-12
Abstract： Objective To explore the design and application effect of path-based health education form for inpatients in the Department of Rheumatology and Immunology. Methods A health education group in the Department of Rheumatology and Immunology was established. By reviewing literature, consulting experts, oriented by patient needs, and combining clinical pathways, a path-based health education form for inpatients was formulated. Homogeneous training and examination were conducted to nurses. Totally 1047 patients admitted to hospital from September 2021 to February 2022 were selected, and the patients'' health knowledge, patient satisfaction and nurses'' satisfaction with application of path-based health education form were measured. Results After the path-based health education form was used, the implementation rate of various health education including admission guidance, dietary guidance, activities, medication guidance and discharge guidance reached 100.00% during the patient''s stay in the hospital, and the satisfaction of patients and nurses was significantly improved (P＜0.01). The mastery rate of diet knowledge, activities, disease and medication knowledge were increased significantly after implementation of path-based health education form (P＜0.01). Conclusion The application of the path-based health education form in inpatients could improve the effect of health education, enhance the nursing quality, and increase working efficiency.
Peer Review Status:
Awaiting Review
Subjects: Physics >> Nuclear Physics submitted time 2023-06-06
Abstract： Accurate 3-Dimensional (3-D) reconstruction technology for non-destructive testing based on digital radiography (DR) is of great importance for alleviating the drawbacks of the existing computed tomography (CT)-based method. The commonly used Monte Carlo simulation method ensures well-performing imaging results for DR. However, for 3-D reconstruction, it is limited by its high time consumption. To solve this problem, this study proposes a parallel computing method to accelerate Monte Carlo simulation for projection images with a parallel interface and a specific DR application. The images are utilized for 3-D reconstruction of the test model. We verify the accuracy of parallel computing for DR and evaluate the performance of two parallel computing modes—multithreaded applications (G4-MT) and message-passing interfaces (G4-MPI)—by assessing parallel speedup and efficiency. This study explores the scalability of the hybrid G4-MPI and G4-MT modes. The results show that the two parallel computing modes can significantly reduce the Monte Carlo simulation time because the parallel speedup increment of Monte Carlo simulations can be considered linear growth, and the parallel efficiency is maintained at a high level. The hybrid mode has strong scalability, as the overall run time of the 180 simulations using 320 threads is 15.35 h with 10 billion particles emitted, and the parallel speedup can be up to 151.36. The 3-D reconstruction of the model is achieved based on the filtered back projection (FBP) algorithm using 180 projection images obtained with the hybrid G4-MPI and G4-MT. The quality of the reconstructed sliced images is satisfactory because the images can reflect the internal structure of the test model. This method is applied to a complex model, and the quality of the reconstructed images is evaluated.
Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2017-12-07 Cooperative journals: 《南方医科大学学报》
Abstract： Objective To investigate the expressions of WWOX and CD133 in colorectal cancer (CRC) and their relationship with the clinicopathologic characteristics of CRC. Methods The expressions of WWOX and CD133 proteins were examined by immunohistochemistry in 174 specimens of CRC tissues and 80 normal colorectal mucosa tissues. Results The positivity rates of WWOX and CD133 proteins were 41.4% and 53.4% in CRC tissues, respectively, significantly different from the rates in normal colorectal mucosa tissues (87.5% and 5.0%, respectively; P<0.05). WWOX and CD133 protein expressions were signi- ficantly correlated with the histological grades of the tumors, depth of invasion, lymph node metastasis, and Duke's stages (P< 0.05). Spearman analysis showed a negative relationship between the WWOX expression and CD133 expression (P<0.05). Kaplan-Meier survival analysis showed that the overall survival time of CRC patients with a positive expression of WWOX was longer than that of patients with a negative expression of WWOX; the overall survival time of patients with a positive expression of CD133 was shorter than that of the negative patients (P<0.05). COX regression analysis identified positive expressions of WWOX and CD133 protein and Duke's stage as the independent prognostic factors of CRC. Conclusion Abnormal expressions of WWOX and CD133 might be involved in the initiation, development, invasion, and metastasis of CRC. Acombined detection of WWOX and CD133 can help in predicting the progression and prognosis of CRC.
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