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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 Natural Gas Industry is the property of Natural Gas Industry Journal Agency 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 New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials 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 Hydrogeology & Engineering Geology / Shuiwendizhi Gongchengdizhi is the property of Hydrogeology & Engineering Geology 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 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 Architectural Journal / Jian Zhu Xue Bao is the property of Architectural 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 Central China Normal University is the property of Huazhong Normal 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.)

Objective The commercial gas rate is an important economic operation assessment index for natural gas purification devices. The paper introduces some studies on improving the commercial gas rate of the natural gas purification. Methods Based on mathematical analysis, the existing equipment of Wanzhou Branch of Natural Gas Purification Plant General was modeled and analyzed, and a plan to reduce self-consumption of gas was finally selected. According to the analysis results, the study was started from the part with the largest heat consumption, that is, the steam volume of the reboiler, and two adjustments were proposed initially: on the one hand, by increasing the MDEA mass fraction and reducing the circulation volume, heat consumed per each regeneration for unit solution was reduced; on the other hand, by adjusting the steam volume of the reboiler, redundant heat which supply the water in the solution system was also reduced. Results It is found that above adjustments contributed to energy saving, consumption reduction and production increase, which has reduced the self-use gas by nearly 25% and elevated the commercial gas rate to 89%. Conclusions By adjusting the heat supply of the reboiler and supplemented by other measures, it has obvious effects on the reduction of self-use gas. [ABSTRACT FROM AUTHOR]

Copyright of China Brewing is the property of China Brewing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of 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 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.)

As for the problem that the control overhead and transmission delay are large in multi-frame transmission mode between LoRa gateway and LoRa terminal in LoRa WAN protocol, this paper proposed an adaptive multi-frame transmission method, which included adaptive multi-frame sending mechanism, adaptive multi-frame receiving confirmation mechanism and frame loss recognition mechanism. The first mechanism set priority level of the confirmed messages, it made confirm immediately for high-level confirmed messages, and confirmed for low-level confirmed messages uniformly after the end of adaptive sending mode. At the same time, it introduced the Fpending mechanism into LoRa WAN uplink multi-frame transmission. The second mechanism recorded the received message frame information by bit vector compression technology, so as to merge to confirm for multiple confirmed messages once. The third mechanism used the CDID value to identify whether the low-level acknowledgment message was lost, and prevented the terminal from entering the sleep mode abnormally. The mathematical analysis and experimental test results show that, compared to the original mechanism, the AMFET mechanism can effectively reduce data transmission delay and data transmission energy consumption on the premise of guaranteeing the reliability of data transmission. [ABSTRACT FROM AUTHOR]

Through the analysis of the mathematical principle of WP algorithm, it could be found that the partial variables determined by high probability are closely related to the backbone set and backdoor set of the formula. For the study of the convergence of WP-solvable formula and WP algorithm, this paper defined WP-solvable formula based on backbone set and backdoor set, and proved the convergence of the WP algorithm by using the G(n, 3, m) model and the planted distribution model, it gave the necessary and sufficient conditions for the convergence of the algorithm. Finally, it carried out the numerical experiments on the model of the planted distribution formula. The results show that if a satisfiab ility formula WP-solvable formula, if and only if the WP algorithm has a high probability of convergence. [ABSTRACT FROM AUTHOR]

It is known that focal length can be recovered from two views when other intrinsic parameters are fixed. This paper presented a more practical work to calibrate focal length from two views with unknown principal point (neither structure nor motion was known a priori). The mathematical analyses showed that the scale of camera coordinates played a crucial role in such calibration circumstance. It proposed a heuristic algorithm to select appropriate scale factor for calibrating focal length. Both simulated and practical tests confirm the significance of scale factor and the good performance of the proposed algorithm, which obtains more accurate focal length calibration than those with no account of scale factor. [ABSTRACT FROM AUTHOR]

Without consideration of attack strategy, the natural connectivity is known as the invulnerability measurement of complex network. In this paper, a topological structure optimization model for complex network is established based on attack strategy in accordance with the node-degree by using the total sum of improved natural connectivity as the objective function. The optimization of topological structure is simulated by applying the Modified Differential Evolution Algorithm with Adaptive and Local Enhanced Operator (ADMPDE) with good performance. The results prove rationality of the model and feasibility of the algorithm. The ratio of nodes with the higher node-degree is increased by 32% and the invulnerability of the complex network is improved significantly. Some useful conclusions are drawn through the analysis of simulation result. This exploration can provide some valuable reference for further research in this field. [ABSTRACT FROM AUTHOR]

Point cloud registration is the important part in the large-scale city reconstruction. Considering the ground plane and buildings, which are the main objects in the city, always consist of several planes, we propose a new method that registering large-scale point clouds together through matched planes. For extracting the planes exactly from the point cloud, this paper presents a novel co-clustering method that clusters data points and hypotheses simultaneously. The traditional methods only cluster the data points, so they will fail to extract some planes. After knowing the planes, we use the random sample method to match the planes. The transformation matrix between the point clouds is calculated from the matched planes. Experimental results not only show that the co-clustering method can extract the planar structure more accurate and robust, but also demonstrate the effectiveness of the novel registration method for the city point clouds. Since the process in our method is only performed to the sparse version of the point clouds, it reduces the amount and complexity of calculation, which makes it to be suitable for the large-scale city reconstruction. [ABSTRACT FROM AUTHOR]

Copyright of China Sciencepaper is the property of China Sciencepaper 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.)