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Combined reticular blind drainage and vertical hierarchical drainage system for landfills located in

Wenjing LU,Zhonge FU,Yan ZHAO

《环境科学与工程前沿(英文)》 2016年 第10卷 第1期   页码 177-184 doi: 10.1007/s11783-014-0710-9

摘要: A novel water control technology that combines the features of a reticular blind drainage system and a vertical hierarchical drainage system is developed and applied in the Yanziyan Sanitary Landfill, which is located at an area (Loudi City, Hunan Province, China) with high rainfall and high groundwater level. The reticular blind drain system, which was installed on the bottom and side walls of the landfill site, can conveniently guide the flow of groundwater out of the site while preventing a disorganized flow of groundwater. The vertical hierarchical drainage system was installed to separate rainfall water and leachate in the landfill site, thus efficiently reducing the pressure of leachate treatment. The whole drainage system plays a key role in foundation stabilization by seepage control and separation and in the instant drainage of rainfall water. The leachate reduction efficiency of the drainage technology was calculated in terms of leachate production before (336519 m ) and after (29664 m ) technology application. Over 90% of leachate derived from rainfall water and groundwater inflow was avoided upon installation of the vertical hierarchical drainage and reticular blind drainage systems. The technology can thus be popularized and applied for water control in landfills located in areas with high rainfall and high groundwater level. The proposed technology can be used to alleviate the pressure of leachate treatment and to reduce the risk of instability.

关键词: landfill     reticular blind drain     vertical hierarchical drain     guidance and drainage     impermeable layer    

Data-driven approach to solve vertical drain under time-dependent loading

《结构与土木工程前沿(英文)》 2021年 第15卷 第3期   页码 696-711 doi: 10.1007/s11709-021-0727-7

摘要: Currently, the vertical drain consolidation problem is solved by numerous analytical solutions, such as time-dependent solutions and linear or parabolic radial drainage in the smear zone, and no artificial intelligence (AI) approach has been applied. Thus, in this study, a new hybrid model based on deep neural networks (DNNs), particle swarm optimization (PSO), and genetic algorithms (GAs) is proposed to solve this problem. The DNN can effectively simulate any sophisticated equation, and the PSO and GA can optimize the selected DNN and improve the performance of the prediction model. In the present study, analytical solutions to vertical drains in the literature are incorporated into the DNN–PSO and DNN–GA prediction models with three different radial drainage patterns in the smear zone under time-dependent loading. The verification performed with analytical solutions and measurements from three full-scale embankment tests revealed promising applications of the proposed approach.

关键词: vertical drain     artificial neural network     time-dependent loading     deep learning network     genetic algorithm     particle swarm optimization    

therapy based on traditional Chinese medicine patterns on patients with pneumoconiosis: a pilot double-blind

《医学前沿(英文)》 2022年 第16卷 第5期   页码 736-744 doi: 10.1007/s11684-021-0870-5

摘要: Effective therapy options for pneumoconiosis are lacking. Traditional Chinese medicine (TCM) presents a favorable prospect in the treatment of pneumoconiosis. A pilot study on TCM syndrome differentiation can evaluate the clinical efficacy and safety of TCM and lay a foundation for further clinical research. A double-blind, randomized, and placebo-controlled trial was conducted for 24 weeks, in which 96 patients with pneumoconiosis were randomly divided into the control and treatment groups. Symptomatic treatment was conducted for the two groups. The treatment group was treated with TCM syndrome differentiation, and the control group was treated with placebo. The primary outcomes were the six-minute walking distance (6MWD) and the St. George Respiratory Questionnaire (SGRQ) score. The secondary outcomes were the modified British Medical Research Council Dyspnea Scale (mMRC), Chronic Obstructive Pulmonary Disease Assessment Test (CAT), Hospital Anxiety and Depression Scale (HADS), and pulmonary function. Only 83 patients from the 96 patients with pneumoconiosis finished the study. For the primary outcome, compared with the control groups, the treatment group showed a significantly increased 6MWD (407.90 m vs. 499.51 m; 95% confidence interval (CI) 47.25 to 135.97; P <0.001) and improved SGRQ total score (44.48 vs. 25.67; 95% CI −27.87 to −9.74; P <0.001). The treatment group also significantly improved compared with the control group on mMRC score (1.4 vs. 0.74; 95% CI −1.08 to −0.23; P =0.003), CAT score (18.40 vs. 14.65; 95% CI −7.07 to −0.43; P =0.027), and the total symptom score (7.90 vs. 5.14; 95% CI −4.40 to −1.12; P <0.001). No serious adverse events occurred. This study showed that TCM syndrome differentiation and treatment had a favorable impact on the exercise endurance and quality of life of patients with pneumoconiosis.

关键词: pneumoconiosis     randomized controlled trials     traditional Chinese medicine    

Analysis on annealing-induced stress of blind-via TSV using FEM

Jie SHAO, Tielin SHI, Li DU, Lei SU, Xiangning LU, Guanglan LIAO

《机械工程前沿(英文)》 2018年 第13卷 第3期   页码 401-410 doi: 10.1007/s11465-017-0457-7

摘要:

Copper-filled through silicon via (TSV) is a promising material owing to its application in high-density three-dimensional (3D) packaging. However, in TSV manufacturing, thermo-mechanical stress is induced during the annealing process, often causing reliability issues. In this paper, the finite element method is employed to investigate the impacts of via shape and SiO2 liner uniformity on the thermo-mechanical properties of copper-filled blind-via TSV after annealing. Top interface stress analysis on the TSV structure shows that the curvature of via openings releases stress concentration that leads to ~60 MPa decrease of normal stresses, sxx and syy, in copper and ~70 MPa decrease sxx of in silicon. Meanwhile, the vertical interface analysis shows that annealing-induced stress at the SiO2/Si interface depends heavily on SiO2 uniformity. By increasing the thickness of SiO2 linear, the stress at the vertical interface can be significantly reduced. Thus, process optimization to reduce the annealing-induced stress becomes feasible. The results of this study help us gain a better understanding of the thermo-mechanical behavior of the annealed TSV in 3D packaging.

关键词: through silicon via (TSV)     annealing-induced stress     interface stress     plastic deformation     finite element method    

一种新的用于3G互连的盲均衡改进算法TDE—CMA

汪 姬,胡爱群,宋宇波

《中国工程科学》 2007年 第9卷 第2期   页码 54-57

摘要:

 DVB中广泛使用的CMA均衡算法一直深受伪收敛问题的困扰。从CMA算法的代价函数、迭代方程 及初始化系数等方面对伪收敛问题进行研究,在此基础上提出一种带时延估计的CMA改进算法。该算法通过引 入时延校正因子来调整主径的位置,从而避免了伪收敛现象。计算机仿真表明该方法大大提高了原算法的收敛 性,并且具有运算量小、易实现的优点,是一种实用性较强的改进算法,适用于高速的3G互连应用。

关键词: 盲均衡     CMA     伪收敛     时延估计    

基于简化LSCMA算法的STBC MC-CDMA系统盲多用户检测

熊亦兰,酆广增

《中国工程科学》 2007年 第9卷 第5期   页码 42-45

摘要:

在空时分组编码(STBC)的MC-CDMA系统中,根据STBC正交编码的特点,提出了一种简单可行 的基于常模(CM)准则的盲多用户检测算法。该算法基于最小二乘常模算法(LSCMA)的盲多用户检测算法, 算法大为简化,抽头系数减少了一半,性能略有下降。

关键词: 盲多用户检测     简化LSCMA算法     空时编码MC-CDMA    

纳卫星微型百叶窗热控技术研究及仿真

杨娟,李运泽,王浚

《中国工程科学》 2008年 第10卷 第7期   页码 169-172

摘要:

微型百叶窗能够适当解决因体积及质量限制而引起的纳卫星内部热环境高热流密度问题。微型百 叶窗驱动的智能化控制方法是亟待解决的关键技术。在球状纳卫星动态特性模型的基础上,提出了一种模 糊PI 混合控制方法。分别在舱内仪器散热增加和减少的工况下进行控制仿真。结果表明,这种并联控制系 统较之单独使用模糊控制器和传统PID控制器在控制效果和动态特性方面更佳。

关键词: 纳卫星     微型百叶窗     模糊PI 控制器     仿真    

一种针对盲图像质量评估的多模态密集卷积网络 Research Article

Nandhini CHOCKALINGAM, Brindha MURUGAN

《信息与电子工程前沿(英文)》 2023年 第24卷 第11期   页码 1601-1615 doi: 10.1631/FITEE.2200534

摘要: 科技进步不断扩大通信行业的潜力。图像在加强交流中发挥着重要作用,已被广泛应用。因此,图像质量评估(IQA)对优化传递给终端用户的内容至关重要。在IQA中使用卷积神经网络面临两个常见难题。一是这些方法难以提供图像最佳表示,另一个问题是模型具有大量参数,容易导致过拟合。为解决这些问题,提出一种参数更少的深度学习模型——密集卷积网络(DSC-Net),用于无参考图像质量评估(NR-IQA)。此外,将多模态数据用于深度学习明显改进各种应用的性能。多模态密集卷积网络(MDSC-Net)融合了灰度共生矩阵(GLCM)方法提取的纹理特征和DSC-Net方法提取的空间特征,并对图像质量进行预测。所提框架在基准合成数据集LIVE、TID2013和KADID-10k的性能表明,MDSC-Net方法在NR-IQA任务中表现出良好性能,超过了当前最先进的方法。

关键词: 无参考图像质量评估;盲图像质量评估;多模态密集卷积网络;深度学习;视觉效果;感知质量    

新型立体式网状宫内节育器初步临床观察

邱毅,王磊光,于玲

《中国工程科学》 2014年 第16卷 第5期   页码 39-46

摘要:

为了观察新型立体式网状宫内节育器(3-DR-IUD)的避孕效果及副反应,将152 例志愿受试者随机分为两组,即接受3-DR-IUD组和放置元宫药铜宫内节育器(2-D-IUD)组,每组各76 例,常规放置3-DR-IUD和2-D-IUD。分别于术后1 个月、3 个月、6 个月和12 个月进行随访,了解放置宫内节育器(IUD)后副反应(如腹痛、腰痛、阴道出血持续时间及出血量、白带等)的发生率、带器妊娠率、IUD脱落率、因症取出率、续用率及避孕效果,并利用B超、X光腹部平片检查3-DR-IUD位置等。两组各76 例均成功放置了IUD,术中均无明显疼痛。3-DR-IUD组术后出现白带增多、月经期延长、不规则出血、月经量增多及腰腹部疼痛等副反应6例(7.9%),而2-D-IUD组出现31例(40.8%),两组比较差异有统计学意义(P<0.000 1)。3-DR-IUD 组无脱落,无带器妊娠者,3 个月时因对硅橡胶过敏取出1 例,12 个月时终止率为1.3 %,续用率为98.7 %(75/76);2-DIUD组终止率为13.2 %,续用率为86.8 %(66/76),两组比较差异有统计学意义(P=0.009)。实验结果表明,3-DR-IUD具有很好的避孕效果,术后副反应轻微,可为育龄妇女提供新的、安全、高效的IUD。

关键词: 3-DR-IUD     临床实验     副反应     避孕效果    

智能天线MC-CDMA系统中空频联合盲多用户检测算法

傅洪亮,酆广增

《中国工程科学》 2006年 第8卷 第2期   页码 34-38

摘要:

提出了智能天线多载波CDMA系统中一种空域和频域联合的盲多用户自适应检测算法,它是将空域波束形成和频域合并检测合二为一,使得检测器在空域和频域两维上同时优化,从而提高了系统的检测性能。对这种空频联合检测算法的误码性能进行了分析,并与先自适应波束形成然后再进行频域合并的分步算法进行了仿真比较,仿真结果表明,提出的空频联合盲多用户自适应检测算法的检测性能优于分步检测算法。

关键词: 智能天线     多载波     CDMA     联合检测    

An integrated method for the rapid dewatering and solidification/stabilization of dredged contaminated sediment with a high water content

Hefu Pu, Aamir Khan Mastoi, Xunlong Chen, Dingbao Song, Jinwei Qiu, Peng Yang

《环境科学与工程前沿(英文)》 2021年 第15卷 第4期 doi: 10.1007/s11783-020-1359-1

摘要: Abstract • An integrated method, called PHDVPSS, was proposed for treating DCS. • The PHDVPSS method showed superior performance compared to conventional method. • Using the method, water content (%) of DCS decreased from 300 to<150 in 3 days. • The 56-day UCS from this method is 12‒17 times higher than conventional method. • Relative to PC, GGBS-MgO binder yielded greater reduction in the leachability. To more efficiently treat the dredged contaminated sediment (DCS) with a high water content, this study proposes an integrated method (called PHDVPSS) that uses the solidifying/stabilizing (S/S) agents and prefabricated horizontal drain (PHD) assisted by vacuum pressure (VP). Using this method, dewatering and solidification/stabilization can be carried out simultaneously such that the treatment time can be significantly shortened and the treatment efficacy can be significantly improved. A series of model tests was conducted to investigate the effectiveness of the proposed method. Experimental results indicated that the proposed PHDVPSS method showed superior performance compared to the conventional S/S method that uses Portland cement (PC) directly without prior dewatering. The 56-day unconfined compressive strength of DCS treated by the proposed method with GGBS-MgO as the binder is 12‒17 times higher than that by the conventional S/S method. DCS treated by the PHDVPSS method exhibited continuous decrease in leaching concentration of Zn with increasing curing age. The reduction of Zn leachability is more obvious when using GGBS-MgO as the binder than when using PC, because GGBS-MgO increased the residual fraction and decreased the acid soluble fraction of Zn. The microstructure analysis reveals the formation of hydrotalcite in GGBS-MgO binder, which resulted in higher mechanical strength and higher Zn stabilization efficiency.

关键词: Dredged contaminated sediment     Dewatering     Solidification/stabilization     Vacuum preloading     Prefabricated horizontal drain     Heavy metal    

新型立式网状宫内节育器对动物子宫肌电和内膜容受性的影响

王磊光,郭成浩,邱毅

《中国工程科学》 2014年 第16卷 第5期   页码 47-51

摘要:

探讨新型立式网状宫内节育器(new three-dimensional and reticular intrauterine device

关键词: 立式网状宫内节育器     子宫肌电     内膜容受性    

Blind identification of threshold auto-regressive model for machine fault diagnosis

LI Zhinong, HE Yongyong, CHU Fulei, WU Zhaotong

《机械工程前沿(英文)》 2007年 第2卷 第1期   页码 46-49 doi: 10.1007/s11465-007-0007-9

摘要: A blind identification method was developed for the threshold auto-regressive (TAR) model. The method had good identification accuracy and rapid convergence, especially for higher order systems. The proposed method was then combined with the hidden Markov model (HMM) to determine the auto-regressive (AR) coefficients for each interval used for feature extraction, with the HMM as a classifier. The fault diagnoses during the speed-up and speed-down processes for rotating machinery have been successfully completed. The result of the experiment shows that the proposed method is practical and effective.

关键词: speed-up     classifier     practical     extraction     experiment    

后量子安全的格盲签密方案 Research Articles

俞惠芳,白璐

《信息与电子工程前沿(英文)》 2021年 第22卷 第6期   页码 891-901 doi: 10.1631/FITEE.2000099

摘要: 盲签密能够保证签密消息的盲性和不可追踪性,可以同时实现盲签名和公钥加密。大多数盲签密都是基于传统数论问题。随着量子计算技术的发展,传统盲签密面临着严峻的安全威胁。作为有前途的抗量子计算候选密码系统,格密码系统在学术领域引起越来越多关注。本文通过将盲签密应用于格密码系统,提出一种后量子安全的格盲签密方案(PQ-LBSCS)。PQ-LBSCS具有格密码体制和盲签密技术的优点。在标准模型中PQ-LBSCS基于带错误学习问题和小整数解问题被证明是安全的。Matlab仿真结果表明PQ-LBSCS比已有方案更高效。PQ-LBSCS安全性强、计算效率高,使其在电子商务、移动通信、智能卡等领域具有广泛应用前景。

关键词: 格密码系统;盲签密;抗量子计算;带错误学习问题;最短向量问题    

一种面向地面区域检测和目标跟踪的多传感器系统协同调度方法 Research Article

张昀普,付强,单甘霖

《信息与电子工程前沿(英文)》 2023年 第24卷 第2期   页码 245-258 doi: 10.1631/FITEE.2200121

摘要: 本文提出一种面向多任务协同的多传感器系统协同调度方法,并将其应用于地面区域检测和目标跟踪。调度的目的是选择最佳的传感器来完成分配的作战任务,并获得最佳作战收益。首先建立区域检测模型,并提出检测风险的计算方法以量化在调度中的检测收益。然后结合道路约束信息和多普勒盲区信息建立地面目标跟踪模型,并引入后验克拉美罗下限评估未来时刻的跟踪精度。最后,考虑检测、跟踪和能耗控制的需求建立目标函数,通过求解目标函数,得到最优的传感器调度方案。仿真结果表明,所提传感器调度方法可以选择合适的传感器完成所需作战任务,并在区域检测、目标跟踪和能耗控制方面均具有良好性能。

关键词: 传感器调度;区域检测;目标跟踪;道路约束;多普勒盲区    

标题 作者 时间 类型 操作

Combined reticular blind drainage and vertical hierarchical drainage system for landfills located in

Wenjing LU,Zhonge FU,Yan ZHAO

期刊论文

Data-driven approach to solve vertical drain under time-dependent loading

期刊论文

therapy based on traditional Chinese medicine patterns on patients with pneumoconiosis: a pilot double-blind

期刊论文

Analysis on annealing-induced stress of blind-via TSV using FEM

Jie SHAO, Tielin SHI, Li DU, Lei SU, Xiangning LU, Guanglan LIAO

期刊论文

一种新的用于3G互连的盲均衡改进算法TDE—CMA

汪 姬,胡爱群,宋宇波

期刊论文

基于简化LSCMA算法的STBC MC-CDMA系统盲多用户检测

熊亦兰,酆广增

期刊论文

纳卫星微型百叶窗热控技术研究及仿真

杨娟,李运泽,王浚

期刊论文

一种针对盲图像质量评估的多模态密集卷积网络

Nandhini CHOCKALINGAM, Brindha MURUGAN

期刊论文

新型立体式网状宫内节育器初步临床观察

邱毅,王磊光,于玲

期刊论文

智能天线MC-CDMA系统中空频联合盲多用户检测算法

傅洪亮,酆广增

期刊论文

An integrated method for the rapid dewatering and solidification/stabilization of dredged contaminated sediment with a high water content

Hefu Pu, Aamir Khan Mastoi, Xunlong Chen, Dingbao Song, Jinwei Qiu, Peng Yang

期刊论文

新型立式网状宫内节育器对动物子宫肌电和内膜容受性的影响

王磊光,郭成浩,邱毅

期刊论文

Blind identification of threshold auto-regressive model for machine fault diagnosis

LI Zhinong, HE Yongyong, CHU Fulei, WU Zhaotong

期刊论文

后量子安全的格盲签密方案

俞惠芳,白璐

期刊论文

一种面向地面区域检测和目标跟踪的多传感器系统协同调度方法

张昀普,付强,单甘霖

期刊论文