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Copyright of China Tropical Medicine is the property of China Tropical Medicine 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 Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics 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 Tianjin Medical Journal is the property of Tianjin Medical Journal 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.)

BaTi()s ceramic and 82 nF Ni-BaTi()s MLCC were placed in seawater and salt-rich air. Impedance analyzer, SEM and EDS were used to investigate the properties and corrosion mechanism of BaTi()s ceramic and 82 nF MI'CC after treatment for 0 h, 24 h, 48 h and 72 h. The results show that when BaTi()s ceramic is placed in seawater, the relative dielectric constant and dielectric loss of BaTi()s ceramic increase at different low frequencies (1 ()-1 0s Hz), and the increase amplitude is huge. Obvious protective film is generated on the surface of the ceramic in 24 h. The variation range of dielectric properties within 72 h is small, and there is no obvious protective film on the surface, but there are certain corrosion traces. The high frequency (1 05-l ()b Hz) capacitance value and dielectric loss of 82 nF MLC'C placed in seawater and salt-rich air for 72 h changes significantly, which is caused by salt immersion in the internal crystallization, but there is also no protective film on its surface, which may be related to the oxide coating on the capacitor surface. [ABSTRACT FROM AUTHOR]

Copyright of Nonferrous Metals (Mining Section) is the property of Beijing Research Institute of Mining & Metallurgy Technology Group 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 Railway Construction Technology is the property of Railway Construction Technology 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 China Brewing is the property of China Brewing 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 Feed Industry is the property of Liaoning Provincial Institute of Agricultural Mechanization 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 Coal Geology & Exploration is the property of Xian Research Institute of China Coal Research 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.)

Stable dielectric constant and low dielectric loss are important parameters to evaluate the dielectric quality of materials. In this study, three rare earth elements Y, La and Sm were doped into the analysis of pure barium titanate by labring-annealing process, and the dielectric properties of barium titanate doped in different proportions were evaluated, and good results were obtained. Three groups of samples with doping ratio of 2 mol%, 4 mol%, 6 mol%, 8 mol% and 10 mol% were prepared and characterized, and dielectric loss measurement and dielectric constant calculation were carried out. The results show that pure grade barium titanate doped with these three rare earth elements has better crystallization and does not inhibit the growth of grain. In the three groups of samples, the B-site was mainly doped to form oxygen vacancy compensation, which inhibited the electron concentration and effectively reduced the dielectric loss, and the stability was better in the full frequency range, less than 0.05. Compared with pure barium titanate ceramics, the dielectric constant decreased from 1500-1600, and the minimum dielectric constant of La doped titanate was 100-400. This research can provide reference for barium titanate in the production and application of actual components. [ABSTRACT FROM AUTHOR]

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.)

Copyright of Arid Zone Research / Ganhanqu Yanjiu is the property of Arid Zone Research 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 Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental Science & Technology 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 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 Industrial Minerals & Processing / Huagong Kuangwu yu Jiagong is the property of Industrial Minerals & Processing 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 South-Central Minzu University (Natural Science Edition) is the property of Journal of South-Central Minzu 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 Industrial Minerals & Processing / Huagong Kuangwu yu Jiagong is the property of Industrial Minerals & Processing 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 Industrial Minerals & Processing / Huagong Kuangwu yu Jiagong is the property of Industrial Minerals & Processing 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 Acta Prataculturae Sinica is the property of Acta Prataculturae Sinica 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 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.)

BACKGROUND: Research evidence shows hip arthroplasty has become the final treatment of osteonecrosis of femoral head, but early- and middle-stage osteonecrosis of femoral head or young patients often give priority to hip preservation treatment, including conservative treatment and surgical treatment. OBJECTIVE: To summarize the progress of hip preservation in the treatment of osteonecrosis of femoral head. METHODS: The literature about hip-preserving treatment of osteonecrosis of femoral head in PubMed, VIP, CNKI and Web of Science databases from 2010 to March 2020 was searched by computer. The key words were “osteonecrosis of femoral head, hyperbaric oxygen, pulsed electromagnetic fields, extracorporeal shock wave, hip arthroscopy, core decompression, stem cell transplantation, non-vascularized free bone grafting, vascularized free bone grafting, porous tantalum rod implantation, intertrochanteric osteotomy, medication”. A total of 197 articles were retrieved, and the full text was consulted. According to the inclusion criteria, 59 articles were included for result analysis. RESULTS AND CONCLUSION: (1) Drug therapy should be used cautiously because of its potential side effects and insufficient research. (2) Physiotherapy is effective for early lesions, and it has the advantages of non-invasion and convenient operation. (3) At present, there are different types of hip preservation surgery. Core decompression is the basic therapy for the treatment of osteonecrosis of femoral head, but it is seldom used alone. At present, it is often treated in combination with other hip preservation therapies. Osteotomy has higher requirements in the selection of patients’ indications and surgical skills, so it should be chosen carefully in clinic. There are some problems in porous tantalum rod implantation, such as long operation time, large blood loss and difficulty of hip replacement in the later stage. Stem cells and arthroscopic therapy show good results, and the research process should be accelerated. Vascularized bone grafting has a good effect on both middle- and late-stage patients. [ABSTRACT FROM AUTHOR]

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica 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 Journal of Engineering Geology / Gongcheng Dizhi Xuebao is the property of Journal of Engineering Geology 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 Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences 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 Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board 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 Functional Materials / Gongneng Cailiao is the property of Chongqing Functional Materials Periodical 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 Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology 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.)

Objective To investigate the relationship between microRNA-424 expression and glioma grades, prognosis, chemosensitivity, IDH1 phenotype and Ki67 expression. Methods 198 followed-up glioma patients were selected from the Chinese Glioma Genome Atlas (CGGA). The expression of microRNA-424 in different groups of patients, and the survival time, progression-free survival time and chemotherapeutic effect of patients with different expression levels of microRNA-424 were compared. The relationship between expression of Ki67 protein and IDH1 phenotype and microRNA-424 expression was analyzed. Results The expression of microRNA-424 was positively correlated with tumor grades. The expression of microRNA-424 increased in IDH1 wild type and Ki67 protein overexpression patients (all P<0.05). The prognosis of patients with high expression of microRNA-424 was significantly worse than that of patients with low expression of microRNA-424, and glioma recurred more easily. The patients with low expression of microRNA-424 were more sensitive to chemotherapy. The survival time of patients with radiotherapy plus chemotherapy was significantly longer than that of patients with radiotherapy alone(P=0.007). Conclusion MicroRNA-424 can be used as a biomarker for the diagnosis, treatment and prognosis of glioma. [ABSTRACT FROM AUTHOR]

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.)

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.)

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical 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.)

The Lasota-Wazewska model is often used to describe the regeneration of red blood cells in animals. Based on the Banach contraction mapping principle and through construction of the Lyapunov function，the existence，uniqueness and global attractivity of pseudo almost periodic solutions to a class of Lasota-Wazewska models were studied. The results have some advantages，and can enrich the characterization of the dynamic behavior of the Lasota-Wazews- ka model. [ABSTRACT FROM AUTHOR]

【Objective】 Debris flow is concentrated in the southeast of Tibetan in Tibetan Plateau and even the national. Debris flow is one of the most severe ecological environment problems in the region. Therefore, the ecological restoration technology of small and medium sized debris flow in Southeast Tibet was explored in this paper. [ Method] The characteristics of vegetation succession in the debris flow gully in the southeast of Tibetan by time-space mutual substitution method were investigated, and its vegetation community composition with important value was determined. [ Result] In the 2700 - 3000 m range of altitude, the succession of plant communities in the debris flow channel was Fragaria moupinensis , Pennisetum centrasiaticum-Populus szechuanica Schneid. var. tibetica Schneid + Elsholtzia fruticosa ( D. Don) Rehd. + Pennisetum centrasiaticum-Populus szechuanica Schneid. var. tibetica Schneid + Lonicera myrtillus Hook. f. et. Thoms + Pennise-tum centrasi- aticum-Populus szechuanica Schneid. var. tibetica Schneid + Sorbaria arborea Schneid + Pennisetum centrasiaticum, the pioneer species of arbor was mainly Populus szechuanica Schneid. var. tibetica Schneid, bush for Elsholtzia fruticosa ( D. Don) Rehd. and Sorbaria arborea Schneid, and herb for Pennisetum centrasiaticum, ； In the 3300 - 3600 m range of altitude, the succession of plant communities was Hippophae rhamnoides Linn, subsp. yunnanensis Rous + Caragana franchetiana Kom. + Potentilla anserine-Betula albo-sinensis Burk. var. septentri- onalis Schneid + Sorbaria arborea Schneid. + Fragaria moupinensis -Betula albo-sinensis Burk. var. septentrionalis Schneid. + Caragana franchetiana Kom. + Fragaria moupinensis, the pioneer species of arbor was mainly Betula albo-sinensis Burk. var. septentrionalis Schneid. , bush for Caragana franchetiana Kom and Sorbaria arborea Schneid. and herb for Fragaria moupinensis. With the succession, the difference of vegetation community gradually increased.【Conclusion】 The difference of community of the vegetation in the deposit zone of debris flow in the southeastern Tibetan is gradually increasing as the succession continues. While following the general law of succession, the restoration of vegetation of the debris flow de­posit areas shall take the local situation into consideration. [ABSTRACT FROM AUTHOR]

Copyright of Shandong Medical Journal is the property of Shandong Medical Health Newspapers 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 Remote Sensing is the property of Editorial Office of Journal of Remote Sensing & Science Publishing Co. 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 Shandong Medical Journal is the property of Shandong Medical Health Newspapers 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.)

目的 探讨超声弹性成像应变率比值（SR）在子宫肌瘤聚桂醇硬化治疗疗效评价中的应用价值。方法 接受超声引导下聚桂醇硬化治疗的子宫肌瘤患者40例（共43枚肌瘤），分别于治疗前及治疗后1、6个月进行超声弹性成像检查，计算病灶 SR。依据治疗后6个月超声造影检查结果，将43个瘤体分为完全灭活组及部分灭活组，比较两组治疗前后SR。结果 43个瘤体中，完全灭活组24个瘤体，部分灭活组19个瘤体。完全灭活组治疗前及治疗1、6个月病灶SR分别为2．61±1．48、2．57±1．79、3．32±1．62，部分灭活组分别为1．30±0．57、1．25±0．60、1．82±0．65；两组各时点 SR 相比，P均＜0．05；同组治疗后6个月与治疗前相比，P均＜0．01。术后1个月 SR 诊断临界值为1．69时，判断瘤体完全灭活的敏感性、特异性、准确性分别为81％、89．5％、85．5％；术后6个月SR诊断临界值为2．085时，判断瘤体完全灭活的敏感性、特异性、准确性分别为100％、84．2％、92．5％。结论 超声弹性成像SR能较为客观地反映病灶硬度，在子宫肌瘤聚桂醇硬化治疗疗效评价中应用效能较好。 [ABSTRACT FROM AUTHOR]