Search

In terms of the theoretical calculation of surface energy for the rare metal Yttrium (Y) with hexagonal close-packed structure, earlier reports failed to predict the precise results. Here, a logical method was employed to evaluate the surface energy of Y (0001) surface, and the obtained value (1. 141 J/M²) is well consistent with the experimental outcome (1. 125 J/M²). Subsequently, the behaviors of Y (0001) surface adsorbing NO at different sites, i. e. hollow (H1, H2, and H3), bridge (B), and top (T) sites were investigated theoretically. It was found that hollow site H1 has a great ability to adsorb NO molecule, of which the adsorption energy is over 5 eV. Meanwhile, a remarkable elongation of N-O distance (about 24%) at H1 site is observed, coupled with the NO molecule being at the surface parallelly. A variation range of N-O elongation for all adsorption sites is from 0. 2Å (T) to 0. 42Å (H1). This theoretical extension of NO at H1 site is obviously more than those of NO being adsorbed on other transition metal surface. [ABSTRACT FROM AUTHOR]

Copyright of Research of Soil & Water Conservation is the property of Institute of Soil & Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources 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.)

Objectives: Object tracking is a research focus in the field of computer vision. The method based on correlation filters performs well in object tracking, but artificial feature description of images has certain limitations in the process of feature extraction. Convolutional neural network (CNN) has been widely used in computer vision, natural language processing and other fields, and they can tune the weights of network parameters by learning training samples to extract depth features of images. In order to obtain more robust feature expression of images, CNN is used to extract the features of images in object tracking. Methods: Combining CNN with correlation filters, we propose an object tracking method based on multi-stage features and asymmetric-dilated convolution. The ResNet50 network embedded with asymmetric-dilated convolution block is used as the network of feature extraction and it can respectively output the feature maps from multiple stages of the network for correlation filters to achieve object detection and localization. Results: The proposed method is tested on OTB100 video dataset. The distance precision can reach 85.38% if the distance threshold is set as 20 pixels, and the overlap precision can reach 80.42% if the overlap threshold is set as 50%. Conclusions: The experimental results verify the accuracy of the proposed method which is relatively robust under certain conditions such as complexity background, occlusion and rotational deformation. [ABSTRACT FROM AUTHOR]

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 Rolling Stock (1002-7602) is the property of Rolling Stock 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 Advances in Water Science / Shuikexue Jinzhan is the property of Editorial Board of Advances in Water Science 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 Multipurpose Utilization of Mineral Resources / Kuangchan Zonghe Liyong is the property of Multipurpose Utilization of Mineral Resources 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.)

In the context of the growing demand for land resources due to the acceleration of new industrialization and urbanization, strictly adhering to the red line of arable land and ensuring food security has increasingly become a major issue of common concern across the country. Based on the new requirements for land use transformation after China has entered a new stage of high-quality development, this paper proposes a path choice for promoting land use transformation to ensure food security in Yunnan on the basis of sorting out the research results of land use transformation and analyzing the food security situation in Yunnan, focusing on stabilizing the grain production capacity, making every effort to strengthen the granary on the plateau, ensuring that Yunnanese is self-sufficient in their own grain, and striving to make more significant con)tributions to ensuring the national food security. [ABSTRACT FROM AUTHOR]

Copyright of Tunnel Construction / Suidao Jianshe (Zhong-Yingwen Ban) is the property of Tunnel Construction 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 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.)

如果顺向型房室折返性心动过速发作时合并功能性束支阻滞,可使原本窄 QRS 波心 动过速变为宽 QRS 波心动过速。 本文报道 2 例预激综合征患者在窄 QRS 波心动过速发作时, 均合并了功能性左束支阻滞,但是二者心动过速时的周长变化却不相同,借助 Coumel 定律可 以解释上述现象。 熟练掌握这一心电学经典定律有助于显性预激术前准确定位房室旁道,并 加深对心动过速折返机制的理解。 [ABSTRACT FROM AUTHOR]

Copyright of Ordnance Industry Automation is the property of Editorial Board for Ordnance Industry Automation 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: At present, surgical trauma and intraarticular injection-induced models are the animal models mainly used for synovitis in knee osteoarthritis. There is still a large distance between the modeling method and the mode of disease occurrence. OBJECTIVE: To establish and evaluate a rabbit model of synovitis in knee osteoarthritis based on the method of “injury-repair-re-injury,” so as to provide model support for the study of synovitis in knee osteoarthritis. METHODS: Sixteen New Zealand white rabbits were randomly divided into two groups: model group (n=8) and control group (n=8). The rabbit’s right knee was injected with 4% papain and 0.03 mol/L L-cysteine to establish the model of synovitis in knee osteoarthritis on days 1, 4, 7, and 12. The skin temperature of the right knee was recorded. Rabbits in each group were killed under anesthesia and the knee joint samples were collected on day 15. Knee joint effusion and cartilage were observed using magnetic resonance imaging. Synovial tissue changes were observed using hematoxylin-eosin staining. Expression levels of inflammatory factors and prostaglandin E2 in the knee synovial fluid were measured by enzyme-linked immunosorbent assay. RESULTS AND CONCLUSION: In the model group, the rat knees became red, swollen and hot obviously at the first injection of the preparation, and the skin temperature was significantly higher than that in the control group. Magnetic resonance imaging revealed obvious synovial effusion and slight damage to the knee cartilage in the model group. Hematoxylin-esoin staining showed synovial tissue thickening and a large number of inflammatory cells infiltrated in the model group. Levels of inflammatory factors and prostaglandin E2 in the synovial fluid were significantly higher in the model group than the control group. Rabbit model of synovitis in knee osteoarthritis can be successfully established by the “injury-repair-reinjury” method, which presents similar conditions with clinical synovitis in knee osteoarthritis, by comprehensive evaluation based on the performance of knee joint surface, skin temperature of the knee, synovial effusion and histological changes of the synovial tissue. [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 Experimental Technology & Management is the property of Experimental Technology & Management 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 Bulletin of the Chinese Academy of Sciences / Chung-kuo ko Hsueh Yuan Yuan Kan is the property of Institutes of Science & Development, Chinese Academy of 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 Telecommunication Engineering is the property of Telecommunication 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.)

Objective　To explore the changing characteristics of fecal bacteria in patients with malignant obstructive jaundice. Methods　From January 2019 to May 2019，87 cases with malignant obstructive jaundice were taken as case bank and screened by inclusion and exclusion criteria. After that，10 patients and 10 healthy relatives of patients were selected， age， sex and BMI were recorded， and faeces were sent for 16srDNA copy number. Results （1）The fecal bacteria abundance and diversity index of the experimental group were lower than that of the control group， but there was no statistical significance （P < 0.05）. However， when the data of fecal bacteria abundance were presented in the Heatmap， the intuitive difference was more obvious. （2） The data of the two groups were subdivided by bacteria genus， and it was found that the composition of fecal bacteria genus in the experimental group changed fundamentally compared with that in the control group （ P < 0.05） . Among them， Escherichia-Shigella，Streptococcus，Veillonella，Enterococcus，Akkermansia increased significantly， while the bacteria genera of wiesia and clostridium declined significantly. Whether the intestinal flora can be rebalanced may affect the therapeutic effect. Conclusion　The fecal flora structure of patients with malignant obstructive jaundice is significantly different from that of normal control group， and the dominant flora genus has been fundamentally changed. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science 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 Geology & Resources is the property of Geology & Resources 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.)

Objective To investigate the protective effects of apigenin against the cell injury of schwann cells cultured with high glucose so as to provide preliminary experimental basis for treatment of diabetic peripheral neuropathy by apigenin. Methods RSC96 cells were primarily cultured and randomly divided into three groups respectively treated with 5.6mmol/L glucose as the control group; with 50mmol /L glucose as high glucose (HG) group; and with HG in the presence of 0.1, 1.0, and 10.0μmol/L apigenin as Api group. Cell viability of RSC96 cells was detected by CCK-8 assay. Cell apoptosis was detected by flow cytometry. The effects of apigenin on the expression levels of NGF and TNF-α in RSC96 cells cultured with high glucose were detected by ELISA assay. The protein and mRNA expression levels of Bcl-2, Bax, NF-κB, p-NF-κB, and NF-κB were examined by Western blotting and qRT-PCR. Results Compared with that of HG group, apigenin at low concentrations (≤1.0μmol/L) significantly increased cell viability in the dose-dependent manner (P<0.05), but apigenin of 10.0μmol/L had no obvious effect on cell viability of high glucose-induced RSC96 cells; apigenin of 1.0μmol/L remarkably inhibited high glucose-induced RSC96 cell apoptosis. Apigenin remarkably increased the protein and mRNA expression levels of Bcl-2 in glucose-induced RSC96 cells (P<0.05), but decreased the Bax protein and mRNA expression levels (P< 0.05). Moreover, apigenin significantly increased the NGF expression level, and decreased TNF-α expression (P< 0.05). In addition, apigenin notably suppressed the phosphorylation level of NF-κB (P<0.05). Conclusion Apigenin can increase cell viability, inhibit cell apoptosis, and regulate the expression levels of NGF and TNF-α in high glucose-induced schwann cells. Its potential mechanism is possibly related with inhibiting NF-κB signal pathway. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science 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.)

The promotion of rural roof photovoltaic project has been strongly supported by the national policy, but because of the instability of light intensity, the output of photovoltaic is intermittent and volatile, and the instability of photovoltaic output causes great impact on the power quality of distribution network after photovoltaic access, so the power quality of distribution network after photovoltaic access becomes very important. The construction of judgment matrix is an important step in power quality evaluation. Because the judgment of the importance degree between two power quality indicators is a relatively vague concept, it is difficult to define clearly. Therefore, there are some differences in the judgment of the importance degree between the indicators from the experts. How to unify the opinions of the experts is the problem to be solved in the construction of judgment matrix. In this paper, the D-S evidence theory was used to fuse the different judgment opinions of experts on the importance of various electric energy indicators to form a judgment matrix, which could avoid the risk of inaccurate evaluation results caused by single expert's misjudgment. Then the weight distribution of each power quality index was obtained by analytic hierarchy process. In order to reduce the interference of subjective factors on the evaluation results, the entropy weight method was introduced to improve the analytic hierarchy process. The probability matrix of each power quality index was analyzed by the method of entropy weight, and the entropy weight distribution of each power quality index was obtained. The two weight allocations were synthesized. The composite weight coefficient reduced the interference of subjective factors on the evaluation results. At the same time, the paper improved the shortcomings of the analytic hierarchy process and the entropy weight method, which not only avoided the steps of consistency checking in the analytic hierarchy process, simplified the calculation, but also solved the disadvantage of the traditional entropy weight method that when the entropy value approached to a minimum, the difference of the entropy value would cause the double changes of the entropy weight. Finally, the final power quality evaluation results were obtained by using probability theory and combining the comprehensive weight and the probability matrix of each power quality index. The simulation results showed that when the three-phase unbalance index and voltage offset index changed dramatically, the weight of the two indexes could be increased from 0.067 and 0.183 to 0.164 and 0.192 by the proposed method, and the final evaluation result could also be increased from 2.323 to 2.679. From the weight coefficient, it showed that the drastic change of the two factors was the main factor affecting power quality. Therefore, the proposed method is more suitable for rural distribution network system with large fluctuation of power quality indicators than the traditional power quality assessment method. [ABSTRACT FROM AUTHOR]

Copyright of Practical Pharmacy & Clinical Remedies is the property of Editorial Department of Practical Pharmacy & Clinical Remedies 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 effects and mechanisms of secreted protein, acidic and rich in cysteine (SPARC) on high fluoride-induced apoptosis of thyrocytes. Methods Human thyroid cells (Nthy-ori 3-1) were cultured and treated with various concentrations (0.1, 1 and 10mmol/L) of NaF for 24h, and the expression of SPARC was evaluated using Real-time PCR and Western blot, respectively. The cells were divided into four groups: control group, NaF group, si-SPARC group (cells were transfected with SPARC siRNA for 48h and then exposed to NaF for 24h), and si-NC group (cells were transfected with negative control siRNA for 48h and then exposed to NaF for 24h). Cytotoxicity was assayed using CCK-8 and LDH; cell apoptosis rate was detected with ELISA. The expressions of cleaved caspase3 (c-caspase3) and IGF-1R were measured by Western blot. In addition, si-SPARC and si-IGF-1R were co-transfected into thyrocytes to further explore mechanisms of SAPRC by evaluating apoptosis. Results The mRNA and protein levels of SPARC were augmented with the increase of NaF (P<0.05). Cell viability was significantly higher in si-NC group than that in si-SPARC group [(84.02±9.51)% vs. (58.31±6.86)%, P<0.05], and the release rate of LDH was lower [(134.25±18.98)% vs. (195.18±23.50)%, P<0.05]. Cell apoptosis rate was lower in si-SPARC group than that in si-NC group [(124.67±19.44)% vs. (175.24±16.46)%, P<0.05]. In addition, silencing SPARC upregulated the expression of IGF-1R (1.95±0.24 vs. 0.93±0.08, P<0.05), and inhibition of IGF-1R reversed the effect of SPARC on apoptosis. Conclusion Inhibition of SPARC reduces high fluoride-induced cytotoxicity and blocks cell apoptosis. The possible mechanism is through the negative regulation of IGF-1R. [ABSTRACT FROM AUTHOR]

目的探讨Select Secure 3830电极房间隔起搏的有效性和可行性。方法 56例置入永久性人工心脏双腔起搏器的患者,依据患者心房电极导线的选择分为两组,其中置入美敦力3830心房螺旋电极共30例为观察组,同期置入美敦力4574心房翼状电极共26例为对照组,两组患者心室均置入3830心室螺旋电极,并于术前完善心电图、超声心动图、胸部正位片等检查。分别记录两组置入即刻、术后1个月、术后3个月、术后个6月心房电极起搏阈值电压、感知电压、阻抗,术后卧床时间,术前及术后6月左房内径大小等各项指标进行分析比较。结果入组患者均按计划成功行心脏双腔起搏器置入术,随访期间无死亡病例,未发生电极脱位、心脏穿孔、心包积液、囊袋感染等并发症。置入即刻,观察组心房电极起搏阈值电压明显高于对照组(P <0. 05),术后1个月、3个月、6个月两组起搏阈值电压无统计学差别(P均>0. 05);观察组术后1个月、3个月、6个月心房电极起搏阈值电压均低于置入即刻。观察组置入即刻、术后1个月、3个月、6个月测得阻抗低于对照组(P均<0. 05)。两组置入即刻、术后1个月、3个月、6个月心房电极感知电压参数无统计学差异(P均> 0. 05)。相较对照组,观察组患者术后卧床时间明显缩短,且术后6个月所测左房内径数值明显小于同期对照组,两者差别具有统计学意义(P均<0. 05)。结论Select Secure 3830电极在心房起搏的应用中安全有效,且能灵活地选择起搏位点,更符合生理传导模式,适合在临床工作中进一步推广应用。 [ABSTRACT FROM AUTHOR]