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Spatial Variability and Distribution of Nitrate Content of Shallow Groundwater in Huang-Huai-Hai Plain

Li Baoguo,Bai Youlu,Hu Kelin,Huang Yuanfang,Chen Deli

Strategic Study of CAE 2001, Volume 3, Issue 4,   Pages 42-45

Abstract:

The spatial variability and distribution of NO3- N in shallow groundwater in Huang-Huai-Haiof NO3—N concentration over 20 mg· L-1 was about 10% of the whole Huang-Huai-HaiXuzhou to Lianyungang in Jiangsu Province and Weifang,in Shandong Provence, which was about 11.5% of the Huang-Huai-HaiPlain.increasing water and fertilizer utilization efficiency and to the sustaining agricultural development in Huang-Huai-Hai

Keywords： Huang-Huai-Hai Plain     groundwater     nitrate     spatial distribution    

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agricultural water saving countermeasures and feasibility of implementing semi-dryland farming in the Huang-Huai-Hai

Shan Lun,Wu Pute ,Kang Shaozhong,  Feng Hao ,Zhang Suiqi

Strategic Study of CAE 2011, Volume 13, Issue 4,   Pages 37-42

Abstract: justify;">Starting from fully excavating the potential of various agricultural water resources in the HuangHuai Hai Region, the achievement, experience and existing problems about agricultural water saving were

Keywords： The Huang Huai Hai Region     agricultural water saving     semi dryland farming     water resources potential    

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Quantitative analysis of yield and soil water balance for summer maize on the piedmont of the North China Plain

Jingjing WANG,Feng HUANG,Baoguo LI

Frontiers of Agricultural Science and Engineering 2015, Volume 2, Issue 4,   Pages 295-310 doi: 10.15302/J-FASE-2015074

Abstract: The North China Plain (NCP) is a major grain production area in China, but the current winter wheat-summer

Keywords： AquaCrop     summer maize     soil water balance     water productivity    

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Research on the Relationship between Personal-Organizational Values Fit and Job Involvement of the New Generation of Employees

Ai-hua Huang,Guo-tao Guo,Hai-xia Qiu

Frontiers of Engineering Management 2015, Volume 2, Issue 1,   Pages 31-34 doi: 10.15302/J-FEM-2015005

Abstract: To improve the management of the new generation of employees, the authors have discussed the relationship between the personal-organizational values fit and job involvement of the new generation of employees, and made perceived organizational support as a mediating variable. The empirical results found that the personal-organizational values fit had a significant positive effect on job involvement of the new generation of employees and the perceived organizational support became as the mediating variable.

Keywords： personal-organizational values fit     job involvement     perceived organizational support     new generation of employees    

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Inheritance and Innovation of Engineering Management Informatization

Kai Sun,Ren-huai Liu

Frontiers of Engineering Management 2014, Volume 1, Issue 1,   Pages 76-82 doi: 10.15302/J-FEM-2014014

Abstract: In the life-cycle of large projects, the operational phase lasts the longest, costs the most and substantially benefits the project. During the whole phase, energy, material and human resources may cost a lot. Effective control of such costs is one of the main targets of engineering management informatization. How to lower the organization collaboration cost in project management and how to support effective collaboration among different areas, organizations and departments in the ways of technology and management are major goals in engineering management informatization. In the phase of project operation, project owners, partners and customers are the stakeholders of engineering management informatization. Through the case of airport management informatization, inherited and innovation of engineering management informatization will be discussed. It is illustrated that airport informatization is the innovation of business model and technology applications through the analysis and study on cases of airport informatization.

Keywords： engineering management     informatization     inter-organizational relationship     management creation     resource sharing    

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GROUNDWATER DEPLETION IN THE NORTH CHINA PLAIN: THE AGROHYDROLOGICAL PERSPECTIVE

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 4,   Pages 594-598 doi: 10.15302/J-FASE -2021407

Abstract:

Agricultural production in the North China Plain with rainfall of less than 500 mm·yr&

Keywords： crop yield / groundwater depletion / sustainability    

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An enhanced damage plasticity model for predicting the cyclic behavior of plain concrete under multiaxial

Mohammad Reza AZADI KAKAVAND, Ertugrul TACIROGLU

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6,   Pages 1531-1544 doi: 10.1007/s11709-020-0675-7

Abstract: Some of the current concrete damage plasticity models in the literature employ a single damage variable for both the tension and compression regimes, while a few more advanced models employ two damage variables. Models with a single variable have an inherent difficulty in accounting for the damage accrued due to tensile and compressive actions in appropriately different manners, and their mutual dependencies. In the current models that adopt two damage variables, the independence of these damage variables during cyclic loading results in the failure to capture the effects of tensile damage on the compressive behavior of concrete and vice-versa. This study presents a cyclic model established by extending an existing monotonic constitutive model. The model describes the cyclic behavior of concrete under multiaxial loading conditions and considers the influence of tensile/compressive damage on the compressive/tensile response. The proposed model, dubbed the enhanced concrete damage plasticity model (ECDPM), is an extension of an existing model that combines the theories of classical plasticity and continuum damage mechanics. Unlike most prior studies on models in the same category, the performance of the proposed ECDPM is evaluated using experimental data on concrete specimens at the material level obtained under cyclic multiaxial loading conditions including uniaxial tension and confined compression. The performance of the model is observed to be satisfactory. Furthermore, the superiority of ECDPM over three previously proposed constitutive models is demonstrated through comparisons with the results of a uniaxial tension-compression test and a virtual test.

Keywords： damage plasticity model     plain concrete     cyclic loading     multiaxial loading conditions    

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Alluvial channel hydrodynamics around tandem piers with downward seepage

Rutuja CHAVAN, Wenxin HUAI, Bimlesh KUMAR

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6,   Pages 1445-1461 doi: 10.1007/s11709-020-0648-x

Abstract: In this paper, we report the turbulent flow structures and the scour geometry around two piers with different diameters. An experiment was conducted on a non-uniform sand bed with two types of tandem arrangements, namely, pier (T1) with a 75 mm front and 90 mm rear, and pier (T2) with a 90 mm front and 75 mm rear, with and without-seepage flows, respectively. A strong wake region was observed behind the piers, but the vortex strength diminished with downward seepage. Streamwise velocity was found to be maximum near the bed downstream of the piers and at the edge of the scour hole upstream of the piers. Quadrant analysis was used to recognize the susceptible region for sediment entrainment and deposition. Upstream of the piers near the bed, the moments, turbulent kinetic energy (TKE), and TKE fluxes were found to decrease with downward seepage, in contrast to those in a plane mobile bed without piers. The reduction percentages of scour depth at the rear pier compared with the front one were approximately 40% for T1 and 60% for T2. Downward seepage also resulted in restrained growth of scouring with time.

Keywords： scour     seepage     Strouhal number     tandem arrangement     turbulent characteristics    

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Parallel Authentication Modes Based on Double Blocks or Key Counter

Huang Yuhua,Huai Aiqun,Song Yubo

Strategic Study of CAE 2004, Volume 6, Issue 7,   Pages 70-74

Abstract:

The CBC - MAC mode is not a parallel one. A parallel authentication mode (PKCB) based on double blocks was put forward in this paper. The PKCB mode had a marked improvement on security & speed over parallel authentication mode, PMAC. And it may be combined with the CTR (counter) encryption mode to form a full block cipher mode. On this ground, another parallel authentication mode (KCTR - MAC) based on key counter was advanced. As compared with the PMAC mode, the KCTR - MAC mode had a marked improvement on security, while its speed did not become lower. The KCTR - MAC authentication mode may be combined with the CTR (counter) encryption mode to form a full block cipher mode (2CTR)，too. The 2CTR mode had a performance advantage over the standard mode, CCM (CTR with CBC - MAC). And it was a fast, practicable mode with security.

Keywords： authentication mode     CBC - MAC mode     PMAC mode     CTR mode     CCM mode    

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A Fast Evaluation and Research Method for Exploration Potential of Oversea Basins

Hong-quan Kang,Yun-hua Deng,Huai-cun Jia,Tao Cheng,Bo Bai

Frontiers of Engineering Management 2016, Volume 3, Issue 4,   Pages 338-342 doi: 10.15302/J-FEM-2016052

Abstract: Oversea hydrocarbon exploration always faces some problems, such as multiple basin types, different exploration prospects, various exploration degrees, diverse data quantities and geological recognitions. This paper focuses on overseas basins with different exploration degrees and offers a new evaluation system and research method for fast evaluation and risk analysis on hydrocarbon potential. Based on the theory of probability, this new evaluation system evaluates each parameter and core accumulation factor with comprehensive and quantitative assignment, to accelerate geological evaluation. In addition, this paper suggests that source rock evaluation should be the core criterion in screening evaluation of poor-explored basins, and also proposes that both the exploration potential and geological recognition should drive the evaluation for basins with high exploration degrees. This new system and method, which is an effective system for fast basin evaluation, is suggested to be used in oversea evaluation and decision-making objectively, scientifically and efficiently.

Keywords： geological risk analysis     probability model     evaluation factors     oversea exploration     hydrocarbon exploration    

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Boundedness of Marcinkiewicz integralwith rough kernel onTriebel-Lizorkin spaces

Chun-jie ZHANG,Fang-fang REN,Yu-huai ZHANG,Gui-lian GAO

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 8,   Pages 654-657 doi: 10.1631/FITEE.1500082

Abstract: This paper is a continuation of our previous work (Zhang and Chen, 2010b). Following the same general steps of the proof there, we make essential improvement on our previous theorem by recalculating a key inequality. Our result shows that the Marcinkiewicz integral, with a bounded radial function in its kernel, is still bounded on the Triebel-Lizorkin space.

Keywords： Marcinkiewicz integral     Triebel-Lizorkin spaces    

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Investigation on the freeze-thaw damage to the jointed plain concrete pavement under different climate

Shuaicheng GUO, Qingli DAI, Jacob HILLER

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 2,   Pages 227-238 doi: 10.1007/s11709-017-0426-6

Abstract: Freeze-thaw damage is one of the main threats to the long time performance of the concrete pavement in the cold regions. This project aims to evaluate the influence of the freeze-thaw damages on pavement distresses under different climate conditions. Based on the Long-Term Pavement Performance (LTPP) data base, the freeze-thaw damage generated by four different kinds of climate conditions are considered in this project: wet-freeze, wet-non freeze, dry-freeze and dry-non freeze. The amount of the transverse crack and the joint spalling, along with the International Roughness Index ( ) are compared among the test sections located in these four different climate conditions. The back calculation with the Falling Weight Deflectometer (FWD) test results based on the ERES and the Estimation of Concrete Pavement Parameters (ECOPP) methods are conducted to obtain concrete slab elastic modulus and the subgrade -value. These two parameters both decrease with service time under freeze condition. Finally, MEPDG simulation is conducted to simulate the development with service year. These results showed the reasonable freeze-thaw damage development with pavement service life and under different climate conditions.

Keywords： LTPP     elastic modulus     k-value     IRI     MEPDG    

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Evaluation of groundwater quality in the Xinjiang Plain Area

Jinlong ZHOU, Xinguang DONG, Yiping WANG, Guomin LI, Xiaojing GUO,

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 2,   Pages 183-186 doi: 10.1007/s11783-010-0021-8

Abstract: Groundwater is the main source of drinking water for the urban and rural residents in the plain areaThe results can be useful for the evaluation and management of water resources in the Xinjiang Plain

Keywords： groundwater quality     evaluation     one veto method     total dissolved solids (TDS)     pH     total hardness    

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Ballistic behavior of plain and reinforced concrete slabs under high velocity impact

Chahmi OUCIF, Luthfi Muhammad MAULUDIN, Farid Abed

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 299-310 doi: 10.1007/s11709-019-0588-5

Abstract: work presents a numerical simulation of ballistic penetration and high velocity impact behavior of plainIn this paper, we focus on the comparison of the performance of the plain and reinforced concrete slabsreinforcements to the concrete samples were found efficient in terms of ballistic resistance comparing to the plain

Keywords： Johnson-Holmquist-2     Johnson-Cook     reinforced concrete     damage     impact loads    

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Augmentation of natural convective heat transfer by acoustic cavitation

Jun CAI, Xiulan HUAI, Shiqiang LIANG, Xunfeng LI,

Frontiers in Energy 2010, Volume 4, Issue 3,   Pages 313-318 doi: 10.1007/s11708-009-0064-3

Abstract: An experimental study was conducted to investigate the effects of acoustic cavitation on natural convective heat transfer from a horizontal circular tube. The experimental results indicated that heat transfer could be enhanced by acoustic cavitation and had the best effect when the head of the ultrasonic transducer was over the midpoint of the circular tube, and the distance between the head and the tube equaled 15 mm. The augmentation at low heat flux was better than that in the case of high heat flux. Based on experimental results, the correlation formula of Nusselt number for water was obtained.

Keywords： heat transfer enhancement     augmentation     acoustic cavitation     acoustic streaming     convective heat transfer    

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Title Author Date Type Operation

Spatial Variability and Distribution of Nitrate Content of Shallow Groundwater in Huang-Huai-Hai Plain

Li Baoguo,Bai Youlu,Hu Kelin,Huang Yuanfang,Chen Deli

Journal Article

agricultural water saving countermeasures and feasibility of implementing semi-dryland farming in the Huang-Huai-Hai

Shan Lun,Wu Pute ,Kang Shaozhong,  Feng Hao ,Zhang Suiqi

Journal Article

Quantitative analysis of yield and soil water balance for summer maize on the piedmont of the North China Plain

Jingjing WANG,Feng HUANG,Baoguo LI

Journal Article

Research on the Relationship between Personal-Organizational Values Fit and Job Involvement of the New Generation of Employees

Ai-hua Huang,Guo-tao Guo,Hai-xia Qiu

Journal Article

Inheritance and Innovation of Engineering Management Informatization

Kai Sun,Ren-huai Liu

Journal Article

GROUNDWATER DEPLETION IN THE NORTH CHINA PLAIN: THE AGROHYDROLOGICAL PERSPECTIVE

Journal Article

An enhanced damage plasticity model for predicting the cyclic behavior of plain concrete under multiaxial

Mohammad Reza AZADI KAKAVAND, Ertugrul TACIROGLU

Journal Article

Alluvial channel hydrodynamics around tandem piers with downward seepage

Rutuja CHAVAN, Wenxin HUAI, Bimlesh KUMAR

Journal Article

Parallel Authentication Modes Based on Double Blocks or Key Counter

Huang Yuhua,Huai Aiqun,Song Yubo

Journal Article

A Fast Evaluation and Research Method for Exploration Potential of Oversea Basins

Hong-quan Kang,Yun-hua Deng,Huai-cun Jia,Tao Cheng,Bo Bai

Journal Article

Boundedness of Marcinkiewicz integralwith rough kernel onTriebel-Lizorkin spaces

Chun-jie ZHANG,Fang-fang REN,Yu-huai ZHANG,Gui-lian GAO

Journal Article

Investigation on the freeze-thaw damage to the jointed plain concrete pavement under different climate

Shuaicheng GUO, Qingli DAI, Jacob HILLER

Journal Article

Evaluation of groundwater quality in the Xinjiang Plain Area

Jinlong ZHOU, Xinguang DONG, Yiping WANG, Guomin LI, Xiaojing GUO,

Journal Article

Ballistic behavior of plain and reinforced concrete slabs under high velocity impact

Chahmi OUCIF, Luthfi Muhammad MAULUDIN, Farid Abed

Journal Article

Augmentation of natural convective heat transfer by acoustic cavitation

Jun CAI, Xiulan HUAI, Shiqiang LIANG, Xunfeng LI,

Journal Article