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随着中国能源转型发展，以电网为核心的电-气互联综合能源系统（integrated electricity and gas systems,IEGS）有望成为能源传输的新载体。IEGS作为能源互联网的基础和过渡，对于提升能源利用效率具有重要意义。随着电转气技术的快速发展，电网和天然气网间具备了双向耦合关系。两网耦合程度不断加深，分别对两网进行研究的传统分析方法可能难以满足IEGS运行的可靠性和经济性，因此越来越多的学者将两网视为一个整体展开协同优化等方面的研究。首先介绍了电转气技术的研究及应用现状，在此基础上，介绍了考虑电网和气网双向耦合的IEGS统一潮流模型建模和求解方法，总结了国内外相关研究现状，并分析了统一潮流模型建模中还可进一步完善提高的关键点。进一步，归纳了面向IEGS的规划、运行调度、最优潮流计算等方面的研究现状。最后，分析了IEGS运行安全性方面的主要研究方向及问题，以期为后续研究提供参考。

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Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials 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 Automobile Technology & Material is the property of Automobile Technology & Material 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 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.)

The molecular-mass and its distribution of poly（p-phenylene terephthamide）(PPTA） directly affect the spinning performance of aramid fiber. The hydrogen bonds between PPTA backbones make PPTA insoluble in common organic solvents such as chloroform， which cannot meet the test requirements of proton magnetic resonance， mass spectroscopy， and gel permeation chromatography （GPC). The soluble n-alkylated PPTAs are obtained by grafting a series of alkyl chains with different lengths and degrees of supersede on the N-position of PPTA backbones. The influence of alkyl lengths and alkylation conditions on relative molecular-mass and its distribution are further studied. Ethyl alkylated PPTA with the highest substitution degree of 98.6% enables to provide the lowest polydispersion coefficient and the more accurate molecular-mass distribution. The relationship between the average relative molecular-mass and the intrinsic viscosity in a specific viscosity range is obtained according to the Makhovink equation ［η］= 9. 96×10-3 Mw1.08 . These results could be utilized for optimizing PPTA synthesis and improving the performance of aramid fiber. [ABSTRACT FROM AUTHOR]

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Copyright of Telecommunications Science is the property of Beijing Xintong Media 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.)

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Objective · To investigate the clinical characteristics of initial peritoneal dialysis (PD) patients with different peritoneal transport status, and analyze risk factors of high peritoneal transport status in PD patients. Methods · A total of 455 consecutive PD patients newly starting PD between January 2007 to October 2015 were retrospectively analyzed. According to the results of the first sPET, patients were divided into H/HA (4h D/Pcr≥0.65) and L/ LA (4h D/Pcr<0.65) groups. Clinical and biochemical characteristics between the two groups were compared. Multivariate logistic regression model was established to investigate risk factors of higher peritoneal transport status of incident PD patients. Results · The study included 372 incident PD patients. The L/LA group and H/HA group had 264 cases (71.2%) and 108 cases (28.8%) respectively. The H/HA group had higher proportion of male patients (63.0% vs 50.8%, P=0.03), lower residual renal function [RRF, (4.26±2.77) mL/min vs (5.79±4.53) mL/min, P<0.01], lower serum albumin level [(29.34±6.89) g/L vs (32.08±5.86) g/L, P=0.00], and more frequent diabetic nephropathy (19.4% vs 9.5%, P=0.00), compared with L/LA group. Univariate and multivariate logistic regression analysis showed that higher peritoneal transport status was associated with lower serum albumin level (OR=0.96, 95% CI 0.28-0.99; P=0.02), male (OR=1.92, 95% CI 1.19-3.12; P=0.00), presence of diabetic nephropathy (OR=2.52, 95% CI 1.26-5.05; P=0.00) and lower residual renal function (OR=0.90, 95% CI 0.83-0.96; P=0.00). The level of hsCRP in patients with hypoalbuminemia was higher than that in patients with normal albumin level (1.69 mg/L vs 0.69 mg/L, P=0.00). Conclusion · Low and low average peritoneal transport status accounted for the majority of the patients in this study. Low serum albumin levels, male, diabetic nephropathy, RRF were risk factors of initial high peritoneal solute transport status. Chronic inflammatory status might partially explain for the correlation between hypoalbuminemia and high peritoneal solute transport status in PD patients. [ABSTRACT FROM AUTHOR]

电池健康状态（state of health，SOH）是保证系统安全稳定运行的关键，健康状态估计不准将影响电池的使用性能，甚至引发电池滥用等问题。电池电化学阻抗谱通过宽频范围内电池的阻抗特征来反映其内部的电化学过程，蕴含了大量电池老化信息，已经逐渐成为分析锂离子电池性能的有力工具。然而，传统的电池阻抗谱测试方法耗时长、成本高昂。为此，以实现锂离子电池的精细化检测与健康状态快速评估为目标，围绕基于电化学阻抗谱重构技术的电池健康状态估计方法展开研究。通过逆重复最大长度序列设计多频电流激励信号，实现了电池阻抗谱的快速测试。采用连续小波变换开展阻抗谱重构，从而获取目标频率范围内的电池阻抗信息，整个过程耗时小于4.5 min。通过不同老化状态电池在特殊频率点下的重构阻抗幅值建立经验模型，实现了电池健康状态的快速准确评估。

Based on the 3D modeling techniques and the measurement of in-situ stress,the tectonic stress field in 15111 working face in Huangyanhui coal mine was inversed.Also,the distribution characteristics of vertical stress on coal seam roof,the vertical stress on the coal pillar along the roadway,the horizontal stress of roadway roof and the deformation of surrounding rock at different positions along the edge of the gob-area in tectonic stress zone were investigated.According to the research result,a method of determining the reasonable narrow coal pillar width in gob-side entry in tectonic stress area was explored,and the narrow coal pillar width in this research was determined to be 6.5 m.The investigation indicates that the reduction of stress concentration factor at the edge of gob-area in tectonic zone is most obvious in the left side of anticline and the right side of oblique,the vertical stress curve of the narrow coal pillar and horizontal stress curve of roadway roof at the symmetrical position of the anticline and the oblique have a respectively similar character,and it becomes more obviously as the coal pillar width increases,at the same time,the vertical stress peak on the narrow coal pillar close to the side of the roadway and the stress curve shows obvious internal and external stress fields as the coal pillar increases.In the tectonic stress zone,the vertical stress peak on the narrow coal pillar tends to the side of the roadway,and the vertical stress field shows obvious internal and external stress fields as the coal pillar width increases.In addition,the tectonic stress also affect the horizontal stress distribution of roadway roof along the gob-side,when the coal pillar width is 4.0-8.0 m,the horizontal stress at the roadway roof decreases gradually from the junction of oblique and anticline to the axis of anticline and syncline,and it turns to an increase character as the coal pillar width increases to 9.0-16.0 m.The effect of folds on the deformation of surrounding rock is obvious when the pillar width is narrow,the roadway deformation in two sides of the fold show respectively similar character when the coal pillar width is 4.0-10.0 m,while the trend changes to share a similar character when the width wider than10.0 m. [ABSTRACT FROM AUTHOR]

汶川地震灾后重建任务艰巨,农村地广人多,更是关键地区.灾民安置的紧迫性要求农居建设先行,相关规划跟进.针对非常规建设程序下的农村规划问题——防震减灾、规划选址、土地整治、产业规划、村民意愿等,以什邡市湔氐镇下院村为例进行研究,通过总结地震灾后农村重建规划经验,试图建立以快速安置为先导的震后农居规划模式.