Search

为实现圆钢管混凝土截面参数组合的快速初选，从最能反映组合效应的短柱轴压性能出发，探讨了材料强度组合的匹配条件，且在该组合建议范围下研究了短柱轴压极限承载力和剩余承载力系数的计算方法，继而对相同极限承载力和剩余承载力系数的截面参数组合特征值进行了分析。研究表明，从考虑充分发挥套箍作用和有效利用混凝土强度的角度出发，混凝土进入塑性状态的时刻宜晚于钢管进入塑性状态的时刻，且该延后时刻不宜过迟；在材料强度组合匹配的前提下，剔除钢管超薄壁的情况，组合效应系数可仅考虑混凝土强度的影响；根据可利用非弹性变形的强度损失不宜过低和材料强度利用率已达最大值，来划分剩余承载力系数的建议区间；在相同极限承载力和剩余承载力系数的条件下，提高混凝土强度更能减小柱外径和截面自重，提高钢材强度则更能减少钢材用量。

激光器频偏和相位噪声是限制CO-OFDM（相干光正交频分复用）系统性能的重要因素。文章提出了CO-OFDM系统中基于差分预编码和MCDD（多载波差分检测）算法的激光器相位噪声和频偏联合补偿方案。对CO-OFDM系统中的频偏和激光器相位噪声作用机理和基于MCDD的补偿方案机制进行了理论推导,并在不同的光信噪比、激光器频偏和线宽条件下进行了系统仿真。仿真结果表明,基于差分预编码和MCDD的联合补偿方法对CO-OFDM系统中的激光器频偏和相位噪声有较好的补偿效果和较大的补偿范围,在不引入系统开销的同时,可有效改善CO-OFDM系统性能。

在现存的宽带通信网中,网络生存性的重要性得到越来越多的重视。针对网络中跨域故障恢复问题,文章提出一种可应用于多域网络故障恢复的新型双重链路权重机制,并对该故障恢复策略进行了理论分析和程序仿真。仿真结果表明,在网络中应用该策略可以在故障发生之后的短时间内,有效地分散业务流量,降低阻塞率,减少资源冲突产生的概率,大大提高了网络的效率和生存性,使其性能得以明显提高。

为了解决频谱碎片问题,针对弹性光网络中业务调制格式可变的特点提出了一种基于调制格式的重构算法,并给出了这种算法与最短径重构算法的仿真比较。仿真结果表明,基于调制格式的频谱重构算法能够更灵活地改变频谱子载波的分配问题,在相同的网络条件下可以有效提高频谱资源利用率。

智能光网络技术和P2MP（点对多点）技术的融合将能够极大地促进光组播业务的发展。文章针对多层多域光网络中的P2MP业务,提出了一种MDMPH（基于分层PCE（路径计算元素）的多域最小代价路径启发式）算法,并进行了仿真分析。与传统的PDB（基于逐域路径）算法、E-BRPC（基于扩展的反向回溯）算法以及CTB（基于核心树）算法相比,MDMPH算法能够计算出代价更小的P2MP路径树。

【目的】应用染色体特异性探针对羊水间期细胞进行 FISH 分析。【方法】对 78 例有产前诊断指征的孕妇进行羊水间期细胞的 FISH 分析及细胞核型分析。【结果】71 例二倍体羊水样本, FISH 诊断与细胞培养核型分析相符; 染色体数目异常 7 例, FISH 诊断出其中 6 例。间期细胞 FISH 的杂交率与探针类型、靶细胞种类及孕周有关。孕晚期羊水样本、母血污染的样本和快速杂交的样本, 以及长时间放置的样本, FISH 分析结果与核型分析完全符合。针对特异探针而言, 染色体非整倍体的诊断准确率达 100%。【结论】应用染色体特异性探针对羊水间期细胞进行 FISH 分析可用于胎儿染色体非整倍体的产前诊断, 该方法简便快速、结论可靠。

Copyright of Acta Scientiarum Naturalium Universitatis Sunyatseni / Zhongshan Daxue Xuebao is the property of Sun-Yat-Sen 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 Acta Scientiarum Naturalium Universitatis Sunyatseni / Zhongshan Daxue Xuebao is the property of Sun-Yat-Sen 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.)

The regional innovation ecosystem is a crucial foundation and driving force for economic and social development. Based on the a- nalysis of the formation process and evolutionary mechanisms of dissipative structures in regional innovation ecosystems, and drawing on the translated Brusselator model, criteria for determining the formation of dissipative structures in regional innovation ecosystems were derived. On this basis, an indicator system for the evolution of dissipative structures in the Yellow River Basin's innovation ecosystem was developed. The study examined the evolution of the dissipative structures in the Yellow River Basin's innovation ecosystem from 2013 to 2021 and used the Getis-Ord Gi* index method to analyze its spatial distribution. The results indicate that within the Yellow River Basin, the provinces of Shandong, Henan, and Sichuan have established innovation ecosystem dissipative structures. Among them, Shandong exhibits a stable development trend in its dissipative structure level, while Sichuan and Henan have experienced periodic fluctuations in their dissipative structure levels during their formation. The determination values for the evolution of the innovation ecosystem's dissipative structures in the upper, middle, and lower reaches of the Yellow River Basin show an upward trend. The dissipative structure level is the highest in the lower reaches, followed by the middle reaches, with the lowest level in the upper reaches. In the Yellow River Basin, the innovation ecosystem's dissipative structure in the lower reaches shows hotspot clustering, the middle reaches display a secondary hotspot-secondary coldspot clustering centered around Shaanxi Province, and the upper reaches have not yet formed significant coldspot clustering. [ABSTRACT FROM AUTHOR]

Copyright of Advances in New & Renewable Energy is the property of Editorial Office of Advances in New & Renewable Energy 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.)

Reliable and effective medium- to long-term power demand forecasting serves as a crucial foundation for power generation and transmission. With the rapid development of China's renewable energy sector, the impact of wind and solar power volatility cannot be overlooked. Consequently, ensuring that future power system planning can economically and efficiently adapt to varying demand scenarios has become a topic of high concern. Here, we propose an integrated evaluation model for predictive dispatch based on the Extreme Learning Machine (ELM) optimized by the Bat Algorithm (BA), alongside the introduction of fuzzy parameters in the cooperative source-load-storage operation algorithm. Moreover, an analysis and research study has been conducted in northwest China as an example. The results show that this model can accurately forecast power demand under diverse development scenarios and provides scientific guidance for optimizing the planning of source-load-storage resources. [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 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.)

Objectives: On September 20, 2019, the Jungong ancient landslide in Lajia Town, Maqin County, Qinghai Province, China suffered a local failure, which led to the interruption of traffic and seriously threatened the safety of local resident's lives and properties. It is urgent to find out the deformation area and deformation law of the ancient landslide, and to provide the support for prevention and control engineering design, monitoring and early warning. Methods: First, using high-resolution satellite images, digital elevation model data and combined with field investigations, the ancient landslide were zoned based on landslide morphological characteristics and signs of deformations; further, Sentinel-1 radar satellite descending data from January 2017 to December 2020 were used to analyze the surface deformation characteristics and deformation patterns of the ancient landslide based on small baseline subset interferometric synthetic aperture radar technology (SBAS-InSAR). Results: Based on the morphological characteristics and deformation signs of the landslide, the ancient landslide was divided into four sub-areas. The SBAS-InSAR results show that the ancient landslide is in a continuous slow creeping state. The strong deformation area of the landslide is mainly located in the road excavation section. Human activities greatly disturb the stability of the ancient landslide. The deformation rate of the strong deformation area of the landslide has a good relationship with rainfall. Conclusions: Although the ancient landslide has been partially treated with anti-slide piles and other projects, the ancient landslide has multi-level sliding surfaces, and the depth of the existing anti-slide piles is not enough. Although the ancient landslide has played a certain role in anti-slide, it has not completely prevented the creep deformation of the land‐ slide. It is suggested that the subsequent treatment projects should use drilling and other exploration techniques to find out the depth of the multi-level sliding surfaces before designing, and installing onsite real-time monitoring and early warning equipment such as crack meters in the strongly deformed areas. Combined with the medium and long-term monitoring of radar satellite InSAR, a point-surface monitoring and early warning system could be realized [ABSTRACT FROM AUTHOR]

Copyright of Atomic Energy Science & Technology is the property of Editorial Board of Atomic Energy 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 Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University 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 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 Natural Gas Geoscience is the property of Natural Gas Geoscience 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 Polymers is the property of Journal of Functional Polymers 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 Rural Water & Hydropower is the property of China Rural Water & Hydropower 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 Research is the property of Editorial Board of Feed 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 Electric Power is the property of Electric Power 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 Food Safety & Quality is the property of Journal of Food Safety & Quality 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 Hydrobiology is the property of Editorial Department of Journal of Hydrobiology 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 Research is the property of Editorial Board of Feed 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 Science Technology & Engineering is the property of Chinese Society of Technology Economics 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 Petrochemical Universities / Shiyou Huagong Gaodeng Xuexiao Xuebao is the property of Journal Editorial Department Of Liaoning Shihua 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 Architecture & Civil Engineering is the property of Chang'an Daxue Zazhishe 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 Food Research & Development is the property of Food Research & Development 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.)

This experiment was conducted to study the molecular weight distribution and the in vitro antioxidant properties of wheat germ peptides and soybean protein hydrolysate. In this single-factor experimental design, taking vitamin C as the control, the scavenging rates of wheat germ peptide and soybean protein hydrolysate on DPPH free radicals, ·OH free radicals and ABTS free radicals were measured at different concentrations (0.625, 1.25, 2.5, 5, 10 mg/mL) by salicylic acid method, DPPH method and ABTS method, and calculate the total reduction force by measuring the absorbance value of T-AOC. The results showed that the average molecular weight of wheat germ peptide and soybean protein hydrolysate was 513 u and 551 u determined by HPLC, and the percentage of oligopeptide with molecular weight less than 1 000 u was 90.22% and 86.93%, respectively. The in vitro antioxidant properties of wheat germ peptide and soybean enzyme digested protein increased linearly with the increase of their concentrations in a certain concentration range (P<0.05), which showed a positive correlation. At a concentration of 10 mg/mL, the scavenging rate of wheat germ peptide on DPPH radicals, hydroxyl radicals and ABTS radicals were 90.39%, 70.66%, 96.24% and 2.23; the scavenging rate and total reducing power of DPPH radicals, hydroxyl radicals and ABTS radicals reached 65.55%, 68.21%, 75.14% and 0.51, respectively, for soybean enzymatic protein at 10 mg/mL. In conclusion, under the conditions of this experiment, both wheat germ peptide and soybean enzymatic protein at different concentrations have antioxidant capacity, and the antioxidant capacity of wheat germ peptide was higher than that of soybean enzymatic protein. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Liquid Crystal & Displays is the property of Chinese Journal of Liquid Crystal & Displays 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 Research is the property of Editorial Board of Feed 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 Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) 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 Medical Equipment Journal is the property of Chinese Medical Equipment Journal 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 Clinical Nursing in Practice is the property of Journal of Clinical Nursing in Practice (Editorial Board, Shanghai Jiao Tong University Press) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

乳腺癌是妇女常见恶性肿瘤,对其超微结构的研究,文献上虽屡有报导,但其中不少问题尚存在分歧。本文利用透射电镜对乳腺癌中最常见的浸润型导管癌进行观察。对其超微结构特点、组织发生学以及肌上皮细胞,肌纤维母细胞在乳腺癌发生发展过程中的作用等方面进行了讨论。

Copyright of Coal Science & Technology (0253-2336) is the property of Coal 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 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 Polymer Materials Science & Engineering is the property of Sichuan University, Polymer 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.)

Copyright of Metal Working (1674-165X) is the property of Metal Working 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 Nanchang University (Engineering & Technology) is the property of Nanchang 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 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 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 Journal of Southeast University / Dongnan Daxue Xuebao is the property of Journal of Southeast 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.)

Copyright of Electric Drive for Locomotives is the property of Electric Drive for Locomotives 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.)