Search

The southwestern Ordos Basin is located at the junction of several stable plates, where faults and fractures are relatively developed, and the influence of fractures on the distribution of tight oil reservoirs in the Yanchang Formation is not clear. To solve this problem, the characteristics of fracture development of the Yanchang Formation, southwestern Ordos Basin and its control on hydrocarbon accumulation have been systematically studied using the core, thin section, well logging, productivity, fault and sand body distribution data. The results show that vertical and horizontal bedding fractures are much more developed in the Chang 8 Member compared with the Chang 6 and 7 Members. For horizontal bedding fractures, they are mainly developed in fine sandstone, followed by siltstone, while no horizontal bedding fractures are observed in medium sandstone. This is because horizontal bedding fractures are more common in fine-grained sediments. For vertical fractures, they are also mainly developed in fine sandstone. The controlling factors of fractures include lithology, sand body thickness, sedimentary microfacies and fault–fracture coupling relationship. Fractures are well developed in the fine-grained sandstone of the wing parts of the main river channel due to small compacted space. In the area where multiple river channels intersect, the sand is pure and easy to break. Based on the comprehensive study of sedimentation, structure and fracture, the classification criteria of sweet point reservoir of the Yanchang Formation are determined: sedimentary microfacies of the main river channel and its wing, tectonic location within 1.5 km from the main fault, plane arrangement of right-lateral and right-order faults and developed fractures. The sweet point reservoir can be identified effectively using the developed sweet point screening criteria.

Terahertz (THz) wave plays important roles in the research of material properties, the non-invasive human security check and the next generation wireless communication. The progress of the scientific and technological applications of THz wave is strongly dependent on the improvement of THz detectors. Here a novel THz wave detection scheme is proposed in which the THz radiation is detected by an audible microphone based on the photo-thermo-acoustic (PTA) effect in graphene foam. Thanks to the room-temperature broadband electromagnetic absorption characteristics of graphene foam and the fast heat transfer between graphene foam and ambient air, this detection method not only inherits the advantages of the photo-thermal THz detector such as room-temperature and full bandwidth, but also has a response time 3 orders of magnitude faster than the photo-thermal detector. Besides, no micro-antenna/electrode is required to fabricate in the graphene foam THz detector which greatly simplifies the detector design and decreases the fabrication cost. It concludes that the room-temperature, full-bandwidth, fast-speed (≥10 kHz), and easy-to-fabricate THz detector developed in this work has superior comprehensive performances among both the commercial THz detectors and the detectors recently developed in laboratory.

This study explores the integration of information technology tools, such as audio signal visualization, score recommendation algorithms based on difficulty features, and sight-singing assessment algorithms, into the development of an intelligent music classroom. It evaluates the impact of these technologies on teaching quality and efficiency, emphasizing their role in enhancing music sight-singing and classroom visualization. Findings reveal that innovative music education significantly improves teaching outcomes. While over half of the students responded positively to the creative teaching approaches, a segment found the material presented through music visualization challenging. However, introducing an intelligent music education classroom markedly benefits students’ musical learning.

Pheochromocytoma is one of rare tumors of neuroendocrine. Most of the tumors are sporadic with about 1/3 of them caused by genetic mutations. Papillary thyroid carcinoma (PTC) from thyroid follicular cells is the most common malignant tumors. However, pheochromocytoma with PTC is rarely reported. Here we present a case report of an 41-year-old male patient found to have an adrenal pheochromocytoma combined with PTC, and PTC was diagnosed first with fine needle aspiration. The patient admitted to hospital, and surgery would be prepared when abnormal blood pressure rose, and operation was suspended. Further CT scan and blood biochemical examination were performed, and concurrent adrenal pheochromocytoma was considered. Multidisciplinary team decided to perform adrenal surgery priority. When the recovery of patient appeared after first operation, radical thyroidectomy was performed. Whether the co-existence of pheochromocytoma and PTC is coincidence or caused by RET gene or unknown inherited genetic mutations is unclear, so accumulation of studies with more combined cases should be done and genetic testing data are needed.

In order to improve the utilization of Haliotis discus hannai mantle, collagen purified from it was hydrolyzed by trypsin and pepsin to prepare angiotensin I-converting enzyme (ACE) inhibitory peptides. The hydrolysate was purified by sequential ultrafiltration, SuperdexTM peptide 10/300 GL gel filtration chromatography and high performance liquid chromatography (HPLC). Three ACE inhibitory peptides, SGEVGQ, QRGPAGAQGPQ and GPPGPAGAR, were obtained . Among them, GPPGPAGAR had the highest ACE inhibitory activity with a half maximal inhibitory concentration (IC50) of 177.1 μmol/L. Molecular docking results showed that GPPGPAGAR mainly acted on the S1 active pocket of ACE and the inhibitory mode was similar to that of lisinopril. GPPGPAGAR still showed high ACE inhibitory activity after simulated gastrointestinal digestion. This study will provide a reference for deep processing of abalone mantle and the development of ACE inhibitory peptides.