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BACKGROUND: In clinical application, simple interspinous fixation without additional interbody fusion has similar fixation effects to pedicle screw and rod fusion internal fixation, and can effectively reduce the range of motion of the responsible segment and the stress of the articular process. However, after simple placement of the new interspinous fusion fixation device BacFuse, the stress at the root of the spinous process is relatively concentrated, and the spinous fracture is prone to occur. If an intervertebral fusion cage is inserted in conjunction with interspinous fixation, Von Mises stress can theoretically be dispersed to reduce the risk of spinous fracture. However, there are few studies on biomechanics and finite element analysis. OBJECTIVE: To observe the biomechanical stability of interspinous fixation-assisted endoscopic interbody fusion in the treatment of severe lumbar spinal stenosis. METHODS: The normal finite element model M0 of the L4-L5 segment of the lumbar spine was established by Mimics, Geomagic, Solidworks, and ANSYS software based on the lumbar CT images of a 26-year-old adult male volunteer excluding spinal diseases. On the basis of M0, the immediate model M1 after endoscopic decompression combined with interbody fusion, the interspinous fixation device (BacFuse) model M2 after endoscopic decompression, and the interspinous fixation (BacFuse) model M3 after endoscopic-assisted interbody fusion were established. The same stress was applied to the upper surface of the L4 vertebral body in the four groups, and the lower surface of the L5 vertebral body was fixed and supported. The range of motion and the extreme Von Mises stress of the endplate bone and the posterior ligament complex of the vertebral body were analyzed under six working conditions of flexion, extension, left/ right bending, and left/right rotation. RESULTS AND CONCLUSION: (1) Compared with model M0, the range of motion value of model M1 increased significantly under six working conditions. Model M2 and model M3 had a significant reduction in range of motion. (2) Compared with model M0, the maximum stress of the vertebral body in model M1 did not change significantly under the six working conditions. The maximum stress at the rear of the M2 vertebral body increased significantly. (3) Compared with model M1, the maximum stress of model M3 did not change significantly under the six working conditions. Compared with model M2, the maximum stress of model M3 decreased significantly. (4) Compared with the model M0, the extreme Von Mises stress of the L4 and L5 endplates of the model M1 was significantly increased. The extreme Von Mises stress in L4 and L5 endplates of models M2 and M3 decreased slightly. Compared with model M1, the Von Mises stress of the bone under the L4 and L5 endplate of models M2 and M3 was significantly reduced. (5) It is concluded that the implantation of BacFuse can effectively reduce the bone stress under the endplate during simple interbody fusion, decrease the risk of cage subsidence, diminish the risk of facet joint fracture on the decompression side, and provide a good stable environment for interbody fusion. The placement of an intervertebral fusion cage can reduce the stress of the root of the spinous process, which is beneficial to decrease the risk of fracture of the root of the spinous process. [ABSTRACT FROM AUTHOR]

Frequent drought has posed widespread, large-scale and extremely severe impact on the ecological environment under global climate and human activities. This study aims to analyze the spatiotemporal dynamic evolution of drought in China. A threshold of -0.5 was chosen to identify drought conditions. A raster was set as the drought state at standardized precipitation evapotranspiration index (SPEI) less than -0.5. The start and end times of drought were varied for each raster within a single event, indicating the dynamic and evolving drought. At the same time, some rasters exited the drought states, while others entering. The contribution rates of drought to rasters were calculated at a given time, in order to capture the dynamic changes in drought. Three perspectives were considered: the extent of drought impact, duration, and severity. The SPEI was then used to assess the drought, in order to introduce the concept of persistent drought rasters. Large-scale and persistent drought events were identified to investigate the spatiotemporal dynamic evolution from 1961 to 2020, together with their response mechanisms to the atmospheric circulation. The research findings can be summarized as follows: 1) A total of 47 events occurred between 1961 and 2020. The 1970s witnessed the highest frequency of large-scale persistent drought events, with 10 occurrences, while the 2000s and 2010s each experienced 9 such events. The average duration of these drought events was 7.14 months, with the longest average duration in the 1960s at 11.83 months. The average extent was 28.66%, with the highest average extent index reaching 33.75% in the 2000s.The average severity was -2.86 for the 47 large-scale persistent drought events. Between 1980 and 2010, the average area affected by persistent drought events each decade showed a continuous expanding trend. Between 1970 and 2020, the average duration of persistent drought events each decade was concentrated between 4 to 8 months. 2) Before the 1990s, the lag time of Oceanic Niño Index's impact on spring precipitation was 3 and 9 months. From then on, the ONI's influence on summer and autumn precipitation extended to 6, 9, and 12 months. Once La Niña events occurred, there was the decrease in the spring precipitation, thereby increasing the frequency of spring droughts in China. 3) There was a resonance period of 16-48 months between ONI and SPEI3 during the years 1961-1976, 1980-1988, 1994-2001, and 2006-2020. The ONI index also demonstrated the strongest correlation with SPEI3 in this timeframe. While the WP index exhibited the weakest correlation with SPEI3 during the same periods.The research results help further understand the causes and patterns of drought in China, thereby enhancing the scientific basis and precision of drought prevention and mitigation policies. [ABSTRACT FROM AUTHOR]

Copyright of China Surfactant Detergent & Cosmetics (2097-2806) is the property of China Surfactant Detergent & Cosmetics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Industrial Water Treatment is the property of CNOOC Tianjin Chemical Research & Design Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Immunology is the property of Medical Periodical Society of Jilin and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

本文分析了电力交易员的决策行为与市场效率之间的关系. 指出了电力交易员的决策行为对市场供求关 系、价格形成和资源配置等方面的影响. 总之, 电力交易员的决策行为与市场效率存在着相互促进的关系, 需要加强 监管和培训, 以提高市场效率和交易员的决策能力. [ABSTRACT FROM AUTHOR]

Diabetes mellitus and frailty promote and influence each other. Frailty is a reversible process, and effective intervention can prevent or delay the development of frailty. This article focuses on the research of non-pharmacological intervention in elderly patients with diabetes mellitus and frailty, aiming to provide reference for clinical practice and research of elderly patients with diabetes mellitus and frailty. [ABSTRACT FROM AUTHOR]

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In order to solve the simple application of interlaminar or intervertebral foramen approach, there is often incomplete decompression for cases of lumbar spinal stenosis caused by multiple sites, multiple factors and multiple layers. By establishing the finite element model M0 of human lumbar L4-L5 segment, an accurate lumbar simulation model was used to investigate simulate the decompression of interlaminar combined with intervertebral foramen approach, that is, the M3 model of periarticular decompression formed by Endo-LOVE combined with PTED. The biomechanical changes and the stability of the responsible segment after the treatment of lumbar spinal stenosis by interlaminar combined with intervertebral foramen approach were studied. The results show that when M3 was in flexion, extension, left bending, right bending, left rotation and right rotation, the activity of L4-L5 responsibility segment increased by 7. 28%, 11. 29%, 0. 51%, 0. 27%, 1. 17% and 0. 51% respectively compared with M0, and no segment instability occurred. When M3 was under six different conditions of flexion, extension, left bending, right bending, left rotation and right rotation, the Von Mises stress extremum of the intervertebral disc increased by 3. 20%, 9. 51%, 0. 55%, 0. 10%, 0. 39% and - 0. 44% respectively compared with M0, and no stress mutation occurred. It is concluded that in the treatment of lumbar spinal stenosis by endoscopic interlaminar combined with intervertebral foramen decompression, the ROM value of the responsible segment and the extreme value of Von Mises stress of the intervertebral disc are not significantly increased compared with the normal L4-L5 segment, and the biomechanical stability is good. It can expand the spinal canal volume and fully decompress under the condition of retaining the facet joint, and effectively maintain the stability of the responsible segment. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of Aeronautical Materials is the property of Editorial Board of Journal of Aeronautical Materials and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Jilin University (Medicine Edition) is the property of Jilin University Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Carsologica Sinica is the property of Institute of Karst Geology, CAGS and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

techniques for posterior spinal endoscopic treatment of lumbar spinal stenosis, have good clinical efficacy. However, there are few reports on biomechanical and finite element analysis. OBJECTIVE: To study the influence of endoscopic LOVE decompression and endoscopic unilateral laminotomy for bilateral decompression on the biomechanics of endoscopic treatment of lumbar spinal stenosis, and verify the reliability and effectiveness of the two surgical methods in the treatment of lumbar spinal stenosis. METHODS: The CT image of one volunteer was taken. The finite element model M0 of lumbar L4-L5 segment was established by Mimics, Geomagic, Solidworks and Ansys software. On this basis, an endoscopic LOVE decompression model M1 and an endoscopic unilateral laminotomy for bilateral decompression model M2 were established. The same stress was applied to the upper surface of L4 vertebral body of the three groups of models. The lower surface of L5 vertebral body was fixed and supported. The total range of motion and the Von Mises stress extreme value of the annulus fibrosus were analyzed under six physiological conditions of forward bending, extension, left bending, right bending, left rotation, and right rotation. RESULTS AND CONCLUSION: (1) Compared with model M0, the overall joint range of motion of model M1 increased by 8.24%, 12.17%, 0.77%, 1.60%, 1.86%, and 6.85% in forward bending, extension, left bending, left rotation, right bending, and right rotation, respectively; the overall joint range of motion of the model M2 increased by 8.24%, 12.17%, 0.77%, 1.60%, 2.17%, and 6.85% in forward bending, extension, left bending, left rotation, right bending, and right rotation, respectively. Compared with the model M1, the overall joint range of motion of the model M2 under the right bending slightly increased, and there was no obvious increase or trend change in the other working conditions. (2) Compared with model M0, the extreme values of Von Mises stress of the annulus fibrosus in model M1 under forward bending, extension, left bending, left rotation, right bending, and right rotation increased by 4.65%, 16.09%, 0.21%, 0.77%, 0.25%, 1.51%, respectively; the extreme values of Von Mises stress of the annulus fibrosus under forward bending, extension, left bending, left rotation, right bending, and right rotation of model M2 increased by 4.58%, 16.15%, 0.20%, 0.80%, 0.23%, and 1.52%, respectively. The variation trends of the extreme value of Von Mises stress of the fibrous annulus of model M1 and model M2 were not obvious under different working conditions. (3) These results confirm that responsibility segment is stable after endoscopic LOVE decompression and endoscopic unilateral laminotomy for bilateral decompression for treatment of lumbar spinal stenosis. [ABSTRACT FROM AUTHOR]

BACKGROUND: Endoscopic fenestration and decompression of cervical lamina lead to changes in bony structure of cervical vertebrae, which in turn leads to biomechanical changes of responsible segments. In clinical rehabilitation, it is urgent to understand the biomechanical changes caused by structural changes so as to establish an accurate exercise rehabilitation program. OBJECTIVE: To establish a three-dimensional solid finite element model for the treatment of cervical spondylotic myelopathy by using the finite element reverse engineering technology, and to establish the static biomechanical analysis of cervical physiological activities, and to formulate the strategy of postoperative accurate exercise rehabilitation training. METHODS: The thin slice plain scan data of cervical vertebrae of volunteers before and after two operations were obtained and imported into Mimics 20.0 software, respectively. Using the preoperative CT data, the finite element model M of C4-5 segment bone tissue was established. The fenestration model M1 of unilateral C4-5 lamina was established by using CT data after the first operation. The fenestration model M2 of bilateral C4-5 lamina was established by using CT data after the second operation. Three kinds of bone models were introduced into 3-matic for surface construction. A 75 N axial downward pressure was applied on the upper surface of the C4 vertebral body, and the intervertebral disc force and vertebral body displacement were recorded under different working conditions. RESULTS AND CONCLUSION: (1) Compared with model M, the stress in intervertebral disc b and d regions of model M1 increased by 10%-12% during the right bending activity, and there was no significant difference in other physiological activities. The stress in b and d regions of model M2 increased by 10%-13% when the right bend was active, and the stress in a and c regions increased by 9%-11% when the left bend was active, and there was no significant difference in other physiological activities. (2) Compared with model M, the displacement of model M1 increased by about 15% under the right bending physiological activity, and increased by about 13% in other directions. Under the physiological activities of left and right lateral bending, the displacement of model M2 increased by about 17%, and increased by about 14% in other directions. (3) It is concluded that full endoscopic fenestration discectomy for cervical spondylotic myelopathy has little effects on the biomechanical stability of the spine as a whole. An accurate exercise rehabilitation program was made according to the biomechanical changes caused by the changes of bone structure after operation. For the patients after unilateral full endoscopic fenestration discectomy, they should focus on the training of the cervical semispinalis muscle and the cephalic semispinalis muscle on the operative side. For patients after bilateral full endoscopic fenestration discectomy, it is necessary to train muscle tissues such as bilateral cervical semispinalis muscle and cephalic semispinalis muscle, so as to increase the muscle strength of the back of the cervical vertebra, and make the cervical vertebra better on the central axis through muscle strength, so as to achieve the purpose of stabilizing the cervical vertebra. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Gold (1001-1277) is the property of Gold Magazine Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Jiangsu University (Natural Science Edition) / Jiangsu Daxue Xuebao (Ziran Kexue Ban) is the property of Editorial Department of Journal of Jiangsu University (Natural Science Edition) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of Zhengzhou University (Natural Science Edition) is the property of Journal of Zhengzhou University (Natural Science Edition) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Zhengzhou University (Natural Science Edition) is the property of Journal of Zhengzhou University (Natural Science Edition) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the development of optical communication technology and photonic integrated circuits, non-reciprocal devices have been widely studied and applied as an important part of optical communication systems. Magneto-optical isolators and circulators based on magneto-optical effect are currently the most widely used non-reciprocal devices. In order to integrate nonreciprocal devices into silicon wafers, magneto-optical thin films with comparable performance to bulk magneto-optical materials need to be prepared. In the near-infrared band (1 550 nm), rare earth iron garnet (RIG) represented by yttrium iron garnets (Y3Fe5O12, YIG) has excellent magneto-optical effects and become one of the most promising magneto-optical materials. It is found that doping with rare earth ions can effectively improve the magneto-optical properties of YIG thin films, especially Bi3+ and Ce3+ doped YIG exhibit giant Faraday effect. In this paper, the Faraday effect principle is briefly introduced, three common growth methods of RIG magneto-optical thin films and their research progress in recent years are reviewed, and the application of RIG magneto-optical thin films in optical isolators and circulators are summarized. Finally, the future development trend of magneto-optical films is prospected. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Materials Science & Engineering (1673-2812) is the property of Journal of Materials Science & Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The ecological disturbance model in the main urban area of Daqing,a resource-based city, was established based on remote sensing technology,GIS spatial analysis method and degree of hemeroby model,as well as the natural resources situation, economic and social development situation and National Land Use Classification. The response mechanisms of spatio-temporal dynamics of ecological disturbance degree and landscape pattern in the main urban area of Daqing from 2000 to 2018 were proposed by landscape pattern index. The variation of degree of hemeroby is characterized by heterogeneity and regional difference. The area with degree of hemeroby index HI≤3 decreased,while HI>6 increased,and other degree of hemeroby areas did not change significantly. The patch density( PD),edge density ( ED),landscape shape index ( LSI) and maximum patch index ( LPI) showed a decreasing trend. Shannon diversity index(SHDI) showed a significant upward trend;while patch aggregation index(AI) first increased and then decreased. Regional landscape heterogeneity decreases with the decrease of landscape and complexity,and landscape patches tend to be homogeneous. In space, the correlation between degree of hemeroby index and landscape pattern index in the whole study area is as follows: LPI>SHDI >ED>LSI>AI. The correlation between PD and HI is not significant. [ABSTRACT FROM AUTHOR]

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Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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