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Copyright of Control Theory & Applications / Kongzhi Lilun Yu Yinyong is the property of Editorial Department of Control Theory & Applications 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 Earth Sciences & Environment is the property of Journal of Earth Sciences & Environment 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 Agrometeorology is the property of Editorial Board of Chinese Journal of Agrometeorology 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: The compensation error of clock offset for a very long baseline interferometry (VLBI) station leads to the shift of delay observables in reference epochs, and further affects the estimation of universal time (UT1). The station clock offset includes the formatter clock offset and the instrumental delay, and the instrumental delay is essential for clock offset compensation. Since the Sheshan VLBI station is the fiducial station of the global geodetic reference frame, it is important to evaluate the compensation accuracy of the clock offset in the Sheshan station. Methods: We used the data of Sheshan station from all international geodetic observations from 2002 to 2017. In terms of different international VIBL service (IVS) correlators, data acquisition systems and recorded bandwidth, the compensation values of clock offsets were computed and analyzed by extracting clock parameters from correlator reports and formatter clock off‐sets from station log files. Results: Different VIBL correlators show good agreement and stability in long term for the instrument delay compensation of the analog terminal in the Sheshan station. However, a systematic bias of clock offset compensation of more than 1 μs is revealed in Sheshan station. Conclusions: In most cases, the compensation accuracy of clock offsets for Sheshan VLBI station can meet the requirement of UT1 measurements. However, it is necessary to improve the searching algorithm of the clock offset and the accuracy of clock offset compensation due to the system bias. [ABSTRACT FROM AUTHOR]

Objective: To explore the relationships between serum homocysteine(Hcy), cystatin C(Cys-C)levels and pulmonary function, arterial blood gas analysis indicators and pulmonary arterial systolic pressure in acute exacerbation of chronic obstructive pulmonary disease(AECOPD)patients with pulmonary hypertension (PH). Methods: 80 patients with AECOPD combined with pH who were diagnosed and treated in our hospital from December 2017 to December 2019 were selected as the AECOPD combined with pH group. 80 patients with AECOPD without pH were selected as the simple AECOPD group and 50 volunteers who had physical examination in our hospital were selected as the healthy group at the same time. The serum Hcy and Cys-C levels, the ratio of forced expiratory volume to forced vital capacity in the first second (FEV1/FVC), arterial oxygen partial pressure (PaO2), forced expiratory volume in the first second as a percentage of predicted value (FEV1%pred), arterial partial pressure of carbon dioxide (PaCO2), pulmonary artery systolic pressure (PASP) in people who were tested of each group were measured and compared, the correlations of each indicator were analyzed. Results: Serum levels of Hcy, Cys-C and PASP were highest in the AECOPD combined with PH group, followed by the simple AECOPD group, and the lowest in the healthy group (P<0.05). The FEV1%pred, FEV1/FVC were highest in the healthy group, followed by the simple AECOPD group, and the lowest in the AECOPD combined with PH group (P<0.05). Compared with the simple AECOPD group, the PaO2 in the AECOPD combined PH group was significantly decreased, while PaCO2 was significantly increased (P<0.05). According to Pearson correlation analysis, serum Hcy and Cys-C were negatively correlated with FEV1%pred, FEV1/FVC and PaO2 (P<0.05), but positively correlated with PaCO2 and PASP (P<0.05). Conclusion: The abnormal increase of serum Hcy and Cys-C levels is related to the AECOPD patients with PH, which is also exist correlations with the decrease of pulmonary function, the abnormality of arterial blood gas and the abnormal increase of PASP in AECOPD patients with PH. [ABSTRACT FROM AUTHOR]

Objective: To explore the relationships between serum homocysteine(Hcy), cystatin C(Cys-C)levels and pulmonary function, arterial blood gas analysis indicators and pulmonary arterial systolic pressure in acute exacerbation of chronic obstructive pulmonary disease(AECOPD)patients with pulmonary hypertension（PH）. Methods: 80 patients with AECOPD combined with pH who were diagnosed and treated in our hospital from December 2017 to December 2019 were selected as the AECOPD combined with pH group. 80 patients with AECOPD without pH were selected as the simple AECOPD group and 50 volunteers who had physical examination in our hospital were selected as the healthy group at the same time. The serum Hcy and Cys-C levels, the ratio of forced expiratory volume to forced vital capacity in the first second (FEV1/FVC), arterial oxygen partial pressure (PaO2), forced expiratory volume in the first second as a percentage of predicted value (FEV1%pred), arterial partial pressure of carbon dioxide (PaCO2), pulmonary artery systolic pressure (PASP) in people who were tested of each group were measured and compared, the correlations of each indicator were analyzed. Results: Serum levels of Hcy, Cys-C and PASP were highest in the AECOPD combined with PH group, followed by the simple AECOPD group, and the lowest in the healthy group (P<0.05). The FEV1%pred, FEV1/FVC were highest in the healthy group, followed by the simple AECOPD group, and the lowest in the AECOPD combined with PH group (P<0.05). Compared with the simple AECOPD group, the PaO2 in the AECOPD combined PH group was significantly decreased, while PaCO2 was significantly increased (P<0.05). According to Pearson correlation analysis, serum Hcy and Cys-C were negatively correlated with FEV1%pred, FEV1/FVC and PaO2 (P<0.05), but positively correlated with PaCO2 and PASP (P<0.05). Conclusion: The abnormal increase of serum Hcy and Cys-C levels is related to the AECOPD patients with PH, which is also exist correlations with the decrease of pulmonary function, the abnormality of arterial blood gas and the abnormal increase of PASP in AECOPD patients with PH. [ABSTRACT FROM AUTHOR]

Copyright of Issues of Forestry Economics is the property of Issues of Forestry Economics 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 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.)

Copyright of Tourism Tribune / Lvyou Xuekan is the property of Tourism Institute of Beijing Union University 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 Practical Electrocardiology is the property of Journal of Practical Electrocardiology 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 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 Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology 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 Journal of China Medical University is the property of Journal of China Medical University 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.)

目的 分析急性脑梗死发病的危险因素。方法 选取 2018 年 1～12 月我院收治的急性脑梗死患者 78 例(观察组),另选 80 例同期入院的非急性脑梗死患者作对照(对照组),采用单因素分析法和多因素Logistic回归分析法分析急性脑梗死发病的危险因素;观察组患者根据 NIHSS 评分分为轻型者25例、中型者35例、重型者18 例,比较观察组不同病情者及对照组血清超敏C反应蛋白 (hs-CRP)、纤维蛋白原 (Fib)、低密度脂蛋白(LDL-C)。结果 单因素分析显示,血清 hs-CRP、Fib、胆固醇 (TC)、LDL-C 是急性脑梗死发病的影响因素;多因素Logistic回归分析显示血清hs-CRP、Fib、LDL-C是脑梗死发病的危险因素。与对照组比较,观察组轻型者和中型者血清hs-CRP、LDL-C、Fib水平升高,重型者血清hs-CRP、LDL-C 水平升高 (P均<0. 05); 与轻度者比较,中型者、重型者血清hsCRP水平升高,重型者血清Fib水平降低(P均<0. 05); 与中度者比较,重型者血清 hs-CRP 水平升高和血清Fib水平降低 (P均<0. 05)。结论 血清 hs-CRP、LDL-C、Fib是急性脑梗死发病的危险因素,血清 hs-CRP 可作为急性脑梗死患者病情严重程度的判定指标。 [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Oil Crop Sciences is the property of Oil Crops Research Institute of Chinese Academy of 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 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.)

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.)

Objective To evaluate the differential diagnostic value of the apparent diffusion coefficient (ADC) for the parotid polymorphic adenoma and adenolymphoma. Methods Totally 31 parotid polymorphic adenoma patients and 20 adenolymphoma patients confirmed pathologically had their data on diffusion weighted imaging (DWI) analyzed retrospectively with b set as (0, 1 000 s/mm2). The mean values of ADC were obtained by measuring the solid parts for three times, and the difference between ADC values of the two kinds of tumors were analyzed and compared. SPSS 17.0 software was used for data analysis. Results The parotid polymorphic adenoma had the ADC value being(1.55±0.45)x 10-3 mm2/s,the parotid adenolymphoma had the ADC value as(1.01±0.35)x 10-3 mm2/s, and there was statistical difference between the ADC values of parotid polymorphic adenoma and adenolymphoma (P =0.001). Conclusion ADC value is of great value for the identification of the parotid pleomorphie adenoma and adenolymphoma, and thus can be used for the selection of clinical surgical plans. [ABSTRACT FROM AUTHOR]

The relationship between the water resources and urbanization is a hot spot in water science research. There is a complex intertwined relationship between water resources and urbanization. This paper selects a typical city in arid region, Zhangye City, as the research subject and takes the strictest water resources management system as constraint condition to analyze the influence of the most significant management system of the water resources on the process of urbanization. Based on the constraint on water resources, it brings in water-saving quantity and grey water footprint to improve the double-factor method for calculating water resources carrying capacity based on water quantity and water quality. A model for calculating the threshold of the urbanization level with the constraint of “Three Red Lines” on water resources management is established. Meanwhile, the paper predicates the urbanization level thresholds of Zhangye City in 2020 and 2030 via scenario simulation and analyzes the historical data of urban development, water resources and water utilization in Zhangye City. The results show as follows. Firstly, the available water resources in Zhangye City is 23.02×108 m3 by 2030 in total under the red lines of water resources development and utilization, which is basically the same as the current situation. In current situation of water resources utilization, the water carrying capacity is difficult to support the water demand in the process of urbanization and economic growth. Secondly, when strictly following the red line control of the water quota standard, the shortage of water carrying capacity in Zhangye City is expected to be alleviated, and the water quantity carrying capacity can provide 331.91 × 104 urban residents with living water by 2030. The increase in water carrying capacity is mainly due to the water saving in the agricultural sector. Thirdly, with the red line on water resources pollution, the upper limit of the water quality carrying capacity in Zhangye City is 62.47×104 people by 2030, which is only 78% of the planned urban population. The carrying capacity of water quality becomes a strong constraint during the process of urbanization and the ammonia emissions in urban areas are the main factors. Lastly, with the constraint of “Three Red Lines” on water resources management, the upper limit of urbanization level in Zhangye City is 48.05% by 2030. In the future development, Zhangye City should put emphasis on strengthening the agricultural saving and sewage treatment to improve the carrying capacity of the water quantity and water quality. [ABSTRACT FROM AUTHOR]

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.)

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.)

Copyright of Journal of Drainage & Irrigation Machinery Engineering / Paiguan Jixie Gongcheng Xuebao is the property of Editorial Department of Drainage & Irrigation Machinery 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.)

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.)

Soil hydrothermal condition is one of the most important factors affecting crop growth and development in semi-arid areas. In this study, we aimed to investigate effects of different film and tillage technology modes on spring maize yield and soil hydrothermal condition in Hetao Irrigation District. The experiment included four treatments: ridge tillage with full film mulching (LQ), ridge tillage with partial film mulching (LB), flat tillage with full film mulching (PQ) and flat tillage with partial film mulching (PB). The results showed that the soil moisture and soil temperature of LQ were higher (P<0.05) than the LB, PQ and PB treatments in the whole growing stage in 2014 and 2015. The suitable soil thermal conditions in LQ made plant grow vigorously, and it consumed large amount of soil water to enhance biomass and leaf area accumulation. In addition, the full film mulching was more effective at enhancing component factors influencing yield and reserving water in soil profile than partial film mulching, which resulted in higher yield and water use efficiency (WUE). There was an inverse correlation between soil temperature and soil moisture in arable layer. With the increasing of temperature and crop water consumption during growing period, LQ showed significant effect on soil water conservation. In 2014 and 2015, the soil temperature was higher (P<0.05) in LQ than in other treatments while the lowest value was recorded in the PB treatment. However, the soil temperature in LB was higher (P<0.05) than in PQ in 2014; it was opposite that higher soil temperature was recorded in PQ compared with LB in 2015. It implied that tillage technology had a significant influence on average temperature compared with mulching mode under drought conditions in 2014. Conversely, mulching mode played an more important role in preserving thermal conditions than tillage technology during the humid year in 2015. Overall, ridge tillage efficiently transferred and accumulated heat from shallow soil layer to deeper layers. Additionally, the higher the soil surface temperature, the more significant the film insulation effect. LQ can not only enhance the number of rows per ear and grain number, but also were conducive to the accumulation of dry biomass, promote the formation of maize yield under drip irrigation, and increase water use efficiency. LQ efficiently promoted water infiltration and regulated the surface temperature resulting in soil moisture conservation and evaporation inhibition. These effects were much clearer and more consistent with ridge tillage. In addition, full plastic film mulch had an insulation effect compared with partial plastic film mulch, and thus thermal energy could be effectively transferred and stored at the tillage layer where it was essential for maize growth. This study could provide a theoretical basis for improving soil hydrothermal conditions in Hetao Irrigation District and thus enhance crop productivity and quality. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Modern Medicine & Health is the property of Journal of Modern Medicine & Health 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.)

肺癌是一种致死率很高的癌症.通过肺部平扫CT影像检测肺结节对肺癌早期诊断、治疗意义重大.全面介绍了 一种革命性的图像识别技术——深度学习方法，在肺结节检测中的应用.首先，横向对比了不同卷积神经网络的结构及其在图像识别上的效果，其次着重分析了不同深度学习方法在训练肺结节分类器上的应用，包括faster-RCNN、迁移学习、残差学习以及迁移学习.还介绍了一些可用的肺部CT影像数据集供读者参考.