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在桁框结构的桁架跨中设置空腹式消能段是一种延性桁框结构。针对该结构体系,首先推导了消能段的极限抗剪承载力,然后提出了桁框结构的简化计算模型,并根据我国抗震设计准则给出了确定消能段长度的计算方法和构造要求。采用此方法确定的消能段可以精确控制延性桁框结构的屈服时刻和破坏模式,并实现水平地震作用下各楼层同步屈服,充分耗能。最后采用有限元方法进行了单向和循环加载分析与验证,结果表明:合理的消能段长度可以显著提高延性桁框结构的延性、耗能能力、承载能力和安全储备,使其抗震性能明显优于普通桁框结构。提供的计算方法具有较高的精度,可以在确保消能段耗能的前提下实现结构的优化设计。

钢框架梁柱T型钢连接是一种采用T型钢通过高强螺栓连接的节点连接,这种连接安装简单、造价经济,而且其刚度相对较大,承载力较大,延性较好,分析和研究T型钢连接的受力机理并提出简化滞回模型,具有重要的理论和工程意义。本文用ANSYS对T型钢连接进行滞回性能的分析,在考虑材料、几何和状态非线性的基础上,系统分析了T型钢的尺寸,柱的尺寸,梁的尺寸,螺栓的级别、直径、竖向间距、预拉力,构件材料,连接抗滑移系数,轴压比等参数对连接滞回性能的影响;有限元分析表明:T型钢的尺寸、是否设柱加劲肋、T型钢翼缘上螺栓的竖向间距对连接的滞回性能影响比较大;并在非线性有限元分析结果的基础上,提出了T型钢连接的弯矩-转角关系式和得到简化滞回模型的方法。

Current statistical query pricing models have not considered the problem that query results reveal sensitive attributes of datasets, making it difficult to incentivize sharing by compensating data providers accordingly. Therefore, this paper proposed a pricing model based on attribute privacy. Firstly, the model calculated query sensitivity based on the relaxed approximation Wasserstein mechanism (RAWM) proposed, improving efficiency by directly calculate the relaxed upper bound of output distribution pairs. Then, with bounding privacy loss, the model compensated data providers based on query sensitivity, noise variance and compensation parameters. Finally, by using cost-plus pricing on compensation, this paper designed several arbitrage-free pricing functions, which could be used in scenarios such as single compensation costs and multiple marginal costs. The experiment results show that the running time of calculating query sensitivity is reduced from linear complexity to constant complexity, with a utility cost of only 0.52% when data volume is 100 million. The pricing model provides fine-grained compensation to incentivize sharing. Pricing functions satisfy arbitrage freeness. [ABSTRACT FROM AUTHOR]

Copyright of Modern Food Science & Technology is the property of Editorial Office of Modern Food 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 Acta Agronomica Sinica is the property of Crop Science Society of China 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 Modern Food Science & Technology is the property of Editorial Office of Modern Food 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 Progress in Modern Biomedicine is the property of Publishing House of Progress in Modern Biomedicine 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 Pathophysiology is the property of Jinan University, School of Medicine 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 Pathophysiology is the property of Jinan University, School of Medicine 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 Mountain Research (10082786) is the property of Mountain 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 Applied Chemical Industry is the property of Shaanxi Research Design Insitute of Petroleum & Chemical Industry 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 Soil & Water Conservation is the property of Bulletin of Soil & Water Conservation 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 Pesticide Science / Nongyaoxue Xuebao is the property of Chinese Journal of Pesticide 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 Inorganic Chemicals Industry is the property of Editorial Office of Inorganic Chemicals Industry 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 Computer Engineering & Applications is the property of Beijing Journal of Computer Engineering & Applications Journal Co Ltd. 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 order to discover insect growth regulators with new structures, 25 novel 4,5,6,7- tetrahydro-2H-indazole hydrazide derivatives were designed and synthesized by the method of linking active substructures with the lead compound C based on the ecdysone receptor (EcR). The structures of these target compounds were confirmed by ¹H NMR, 13C NMR and HRMS. Moreover, molecular docking study revealed that all target compounds had a good binding force with the EcR, wherein the compound I-15 had the similar binding mode with EcR as tebufenozide, which can bind well with the active site of EcR. And the protein binding experiments showed that the binding activity of I-15 to EcR was 75.8%±7.2% at a concentration of 40 mg/L. In addition, preliminary bioassay results showed that some target compounds had certain insecticidal activity against the Plutella xylostella at 500 mg/L, but their activities were not as good as tebufenozide and C. The ClogP values of target compounds were lower than the lead compound, which indicated that their liposolubility was not good enough to penetrate the insect cuticle, resulting in poor insecticidal activity. This work provides important clues for the further structure optimization [ABSTRACT FROM AUTHOR]

Copyright of China Journal of Oral & Maxillofacial Surgery is the property of Shanghai Jiao Tong University, College of Stomatology 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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Objective To establish a nomogram for predicting the risk of post-hepatectomy complications (PHC) in hepatic echinococcosis by analyzing the risk factors for PHC in two types of hepatic echinococcosis, and to investigate its value in clinical practice. Methods A retrospective analysis was performed for the clinical data of 263 patients with two types of hepatic echinococcosis who underwent hepatectomy in Qinghai University Affiliated Hospital from January 2015 to August 2020, and among these patients, 93 were enrolled as PHC group and 170 were enrolled as control group. The Mann-Whitney U test was used for comparison of non-normally distributed continuous data between two groups, and the independent samples t-test was used for comparison of normally distributed continuous data between two groups; the chi-square test and the Fisher's exact test were used for comparison of categorical data between two groups. Univariate and multivariate logistic regression analyses were used to screen out independent risk factors for PHC, and a nomogram risk prediction model was established based on the weight of each independent risk factor. The Bootstrap resampling method was used for internal verification of the model; the receiver operating characteristic (ROC) curve was plotted to evaluate the discriminatory ability of the model; calibration curve and the Hosmer-Lemeshow test were used to evaluate the consistency of the model; decision curve analysis (DCA) was performed to verify the clinical effectiveness of the model. Results Albumin-bilirubin (ALBI) score (odds ratio [OR]=3.694, 95% confidence interval [CI]: 1.860-7.336, P < 0.05), time of operation (OR=2.848, 95%CI: 1.384-5.859, P < 0.05), intraoperative blood loss (OR=4.832, 95%CI: 2.384-9.793, P < 0.05), and hydatid diameter (OR=3.073, 95%CI: 1.528-6.177, P < 0.05) were independent risk factors for PHC in two types of hepatic echinococcosis. A nomogram risk prediction model was established based on the weight of the above four independent risk factors, and the model had an area under the ROC curve of 0.877 (95%CI: 0.831-0.923). The model had a consistency index of 0.871 after internal verification using the Bootstrap resampling method, suggesting that the model had good discriminatory ability. The fitting of the observed value and the actual value of the calibration curve and the Hosmer-Lemeshow test (P=0.905) showed that the predicted value of the nomogram risk prediction model had good consistency with the actual observed value. When the threshold probability was 35.6%, DCA showed a net clinical benefit of 22%, and the model had good clinical applicability within the threshold probability ranging from 8% to 89%. Conclusion ALBI score, time of operation, intraoperative blood loss, and hydatid diameter are independent risk factors for PHC in patients with two types of hepatic echinococcosis, and the nomogram risk prediction model established based on these factors has good accuracy, consistency, and clinical practicability. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Forensic Medicine / Fayixue Zazhi is the property of Journal of Forensic 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 Journal of China University of Petroleum is the property of China University of Petroleum 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.)

Copyright of Journal of Computer Engineering & Applications is the property of Beijing Journal of Computer Engineering & Applications Journal Co Ltd. 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 Ceramic Society is the property of Bulletin of the Chinese Ceramic Society 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 Journal of Oral & Maxillofacial Surgery is the property of Shanghai Jiao Tong University, College of Stomatology 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 curative effect of the traditional Chinese medicine Kangxuke Mixture via nasal feeding in the treatment of severe burn patients with shock stage and its influence on gastrointestinal resuscitation. Methods: A total of 60 patients with severe burn shock who were admitted to the Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine from October 2017 to September 2020 were selected, and they were divided into a control group and an experimental group according to a random number table. 30 cases. Patients in the control group received conventional anti-shock treatment, and the experimental group was treated with anti-shock mixture by nasogastric feeding on the basis of conventional anti-shock. Observe and record the arterial blood lactic acid, endotoxin levels, heart rate, urine output and fluid rehydration before resuscitation, 1 d, 2 d, and 3 d after resuscitation, the recovery time of bowel sounds, the time of anal exhaust, and digestion of abdominal distension. Adverse reactions, incidence of gastrointestinal bleeding, and presence or absence of secondary systemic infections. Results: After treatment, the serum endotoxin and arterial blood lactic acid levels of the two groups of patients decreased in different trends. Although the laboratory indicators of the two groups of patients decreased at 1 and 2 days after resuscitation, the difference between the two groups was not significant (P >0.05), the values ​​of serum endotoxin and arterial blood lactic acid decreased significantly after 3 days of resuscitation in the experimental group, and were significantly better than those in the control group, the difference was statistically significant (P<0.05). The amount of fluid supplementation in the experimental group at 1 and 2 days after resuscitation was lower than that in the control group (P<0.05); there was no significant difference in urine output between the experimental group and the control group at 1 and 2 days after resuscitation (P>0.05), while resuscitation The urine output in the last 3 days was more than that of the control group (P<0.05); the heart rate of the experimental group was better than that of the control group on the 1st, 2nd, and 3rd day after resuscitation (P<0.05). The experimental group's abdominal distension relieved bowel sounds, recovery time, anal exhaust time, dyspeptic reactions, gastrointestinal bleeding, and the incidence of secondary systemic infections were lower than those in the control group (P<0.05). Conclusion: The anti-shock mixture of traditional Chinese medicine administered by nasal feeding combined with conventional anti-shock treatment of western medicine can give full play to the characteristics of traditional Chinese medicine. The clinical effect of treating severe burn patients in shock stage is clear. It is helpful for gastrointestinal resuscitation and reduces the risk of complications and infection. [ABSTRACT FROM AUTHOR]

Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil 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 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.)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue 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.)

CO2 geological storage is an effective means to reduce CO2 emission into the atmosphere and alleviate the dangers of greenhouse effect. The sloping strata are common in nature due to tectonic and diagenetic effects, which have practical significance to study the effect of sloping strata on CO2 storage amount and security. Based on a demonstration project in Fukang sag of Junggar Basin, Xinjiang, the influence of the variation of stratigraphic dip angle of CO2 reservoirs with mid-high permeability on the process of CO2 geological storage was studied by means of numerical simulation. The results show that the injection of CO2 leads to a significant increase in the stratigraphic pressure near the well; compared with horizontal strata, the sloping strata have a significant difference on pressure distribution, CO2 migration distance, CO2 injection rate and storage amount. CO2 lateral migration distance of sloping strata is significantly larger than that of horizontal strata under the action of asymmetric stratigraphic pressure. The pressure distribution and dissipation process in sloping strata are quite different from that in horizontal strata; as a result, the influence of sloping strata on CO2 total injection amount presents a non-monotonic change.At the initial stage of injection, the CO2 total injection amount in sloping strata is less than that in horizontal strata, and with the injection time extension, the CO2 total injection amount in sloping strata gradually approaches and exceeds that in horizontal strata. After injection for 20 years, the larger the dip angle of sloping strata is, the more helpful to the increase of CO2 total injection amount, which is contrary to the conclusion of sloping strata with low permeability by previous studies. The existence of stratigraphic dip angles can promote CO2 migration to the shallow part, the larger dip angle can greatly increase the risk of CO2 leakage to the shallow aquifer or atmosphere. Therefore, the influence of sloping strata on the storage efficiency and security should be fully considered in the site selection of CO2 geological storage. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Northeastern University (Natural Science) is the property of Dongbei Daxue Xuebao 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.)

Firstly, the Daubechies (db6) wavelet system was chosen to conduct multi-time scale horizontal decomposition of the precipitation and crop water requirement time series in the Luhun irrigation area from the year 1970 to 2013. Taking the obtained wavelet coefficients from 1970 to 2003 as the input data and irrigation water amount as the output data, a wavelet neural network based on multi-scale wavelet transform was used to predict and simulate, and using single hidden layer BP, double hidden layer BP neural network and wavelet neural network respectively predict and compare. The results show that the relative error precision and the prediction stability of the wavelet neural network model with multi-scale wavelet transform are higher than that of the other three models. The average prediction relative error of these four prediction models ranking: The single hidden layer BP neural network> double hidden layer BP neural network> wavelet neural network> multi-scale wavelet transform Wavelet neural network. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Clinical Hepatology / Linchuang Gandanbing Zazhi is the property of Journal of Clinical Hepatology 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 Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic 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.)

Taking into consideration that the river basin management institution has actual demand on agricultural water saving management work in Haihe River basin and based on the comprehensive consideration of current influence factor and conditions in Haihe River basin, the evaluation index system of division zones of agricultural water saving in Haihe River basin was constructed, a fuzzy clustering method was applied to divide Haihe River basin into 6 first level agricultural water saving division zones and 19 second level agricultural water saving division zones and the rationality of the division was discussed, then the future working direction was proposed with the consideration of implementation of the strictest water resources management system. [ABSTRACT FROM AUTHOR]

Under the double stress of global climate change and human activities, the fragile ecosystem in arid desert region of Northwest China has undergone profound changes. Thus, how to evaluate the ecological vulnerability of the arid land has become a hot topic in the field of ecology. Fully considering the characteristics of the eco- environment (desertification, salinization, wind erosion, drought and other disasters) in the study area, we introduced extreme climate event factors (indicating the climate changes) and large-scale landscape pattern indexes (indicating the disturbance of human activities on the ecological landscape) to establish the evaluation system of ecological vulnerability in arid desert region of Northwest China. Then, the spatial-temporal change of ecological vulnerability and its driving mechanism during the past 13 years were analyzed and discussed. The results showed that: the ecological vulnerability of arid desert region in Northwest China generally belonged to the level of moderate or severe vulnerability, and the spatial distribution pattern of ecological vulnerability showed a decreasing trend from east to west and a“E”pattern appeared in the western part, which was significantly affected by the atmospheric circulation and special landform of“Two basins sandwiched with three mountains”. During the period of 2000- 2013, the ecological vulnerability in the arid desert region of Northwest China showed a decreasing trend, and the changes were greatly affected by temperature, precipitation and human activities. There were significant relationships between the change intensity of ecological vulnerability and climatic tendencies of precipitation and temperature. The research results can provide decision supports for ecological protection and management in arid desert region of Northwest China. [ABSTRACT FROM AUTHOR]

Copyright of China Journal of Oral & Maxillofacial Surgery is the property of Shanghai Jiao Tong University, College of Stomatology 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.)