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Improving the performance of waste stabilization ponds in an arid climate

JOURNAL OF WATER AND CLIMATE CHANGE 2021年第8期12卷 3634-3647页

作者： Achag, Badre Mouhanni, Hind Bendou, Abdelaziz Natl Sch Appl Sci Agadir Mat Mech & Civil Engn Lab Agadir Morocco

In many parts of the world, waste stabilization ponds (WSPs) are currently the preferred wastewater treatment method for municipal wastewater. The objective of this research is to examine the performance of a WSP in an arid climate region and to identify ways to improve its purification efficiency so that it can meet the criteria for reuse. The results attributed the poor performance to both improper process and physical design after 12 months of physicochemical and bacteriological analyses, as well as monitoring of operation, maintenance and loading rates. In tertiary treatment, maturation ponds are added, an increase in the capacity of the station, and management of the flow rate and retention time for each pond. By simulating the new WSP with GPS-X, the best pond area ratio obtained is 2.5 m2/capita, with a retention time of 4 days for anaerobic ponds, 20 days for facultative ponds and 3 days for two maturation ponds in series, which is suitable and provides reduction rates of BOD and fecal coliforms of 95 and 99%, respectively, with an average effluent concentration of 20 mg/L and 195 CFU. According to the results, well-maintained WSPs provide a viable, self-sufficient and environmentally friendly wastewater treatment solution for irrigation water supply in dry areas.

关键词： extension maturation ponds modulization waste stabilization ponds wastewater

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Models for Solving Integrated Planning and Scheduling Problem: Computational Comparison

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INTERNATIONAL JOURNAL OF ENGINEERING RESEARCH IN AFRICA 2018年 34卷 161-170页

作者： Hassani, Zineb Ibn Majdoub El Barkany, Abdellah Jabri, Abdelouahhab El Abbassi, Ikram Sidi Mohammed Ben Abdellah Univ Fac Sci & Tech Mech Engn Lab BP 2202 Route Imouzzer Fes Morocco EPMI ECAM 13 Blvd Hautil F-95092 Cergy Pontoise France

This article concerns the integration of planning and scheduling production system. Planning and scheduling are usually treated separately because of their complexity. Scheduling largely depends on the production quantities computed at the production planning level. However, ignoring scheduling constraints in the tactical level leads to inconsistent decisions. So, it is important to integrate planning and scheduling to efficiently manage operations and to determine a realistic production plan for a given sequence of jobs on each machine. In this paper, we present some approaches proposed to solve the problem and we realize a comparison between the two most interesting ones, using the standard solver CPLEX.

关键词： Planning scheduling integration constraints modulization MILP comparison CPLEX

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New Approach to Integrate Planning and Scheduling of Production System: Heuristic Resolution

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INTERNATIONAL JOURNAL OF ENGINEERING RESEARCH IN AFRICA 2018年 39卷 156-169页

作者： Hassani, Zineb Ibn Majdoub El Barkany, Abdellah Jabri, Abdelouahhab El Abbassi, Ikram Darcherif, Abdel Moumen Sidi Mohammed Ben Abdellah Univ Mech Engn Lab Fac Sci & Tech BP 2202Route Imouzzer Fes Morocco ECAM EPMI 13 Blvd Hautil F-95092 Cergy Pontoise France

In general, planning and scheduling of production are treated separately under the hierarchical strategy. Then, over the time, the iterative strategy appeared which partially considers the scheduling constraints during planning, except that the latter remains unsatisfactory because there is no guarantee that these constraints are taken into account. For this, is born the integrated strategy which integrates planning and scheduling and aims to solve the problem and define a feasible production plan. Since capacity constraints don't reflect reality in terms of resource availability, and they are not always considered, capacity becomes aggregated. To remedy this problem, it is necessary to integrate more precise constraints of scheduling at the planning level. Based on this observation, we propose in this article a new model that integrates planning and scheduling and considers the constraint of resource availability. In our model, the objective function optimizes the total cost of production for a mono-level job-shop problem. To solve this N-P difficult problem we use a stochastic approached method as genetic algorithm (GA).

关键词： Production Planning scheduling integration constraints modulization Job-shop MILP genetic algorithm

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Functional flexible and wearable supercapacitors

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JOURNAL OF PHYSICS D-APPLIED PHYSICS 2017年第27期50卷 273001-273001页

作者： Huang, Yan Zhi, Chunyi City Univ Hong Kong Dept Phys & Mat Sci 83 Tat Chee Ave Hong Kong Hong Kong Peoples R China City Univ Hong Kong Shenzhen Res Inst Shenzhen 518000 Peoples R China

Substantial effort has been devoted to endowing flexible and wearable supercapacitors with desirable functions and solving urgent concerns regarding their practical application, particularly materials selection, air permeability, self-healability, shape memory, integration, and modularization. This gives rise to challenges with regard to both suitable materials and device fabrication. This review highlights the current state-of-the-art of these supercapacitors pertinent to materials, fabrication strategies, and performance. Challenges and solutions are also discussed to further improve their practicality. The aim of this review is to make a timely summary of this emerging field and discuss future opportunities and challenges.

关键词： supercapacitor flexibility wearability self-healability shape memory integration modulization

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Standardization Study of Assembly Floor Slab in Steel Frame Structure 3

Standardization Study of Assembly Floor Slab in Steel Frame ...

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3rd International Conference on Civil, Architectural and Hydraulic Engineering (ICCAHE)

作者： Wang, Yabo Dou, Gaofeng Xi, Chuanhao Qian, Lei Liu, Hanting Jilin Jianzhu Univ Changchun 130118 Jilin Peoples R China

ISBN: (纸本)9783038352587

The types of assembly floor slab member and the present development situation of assembly floor slab standardization at home and abroad is presented in the article, as well as assembly floor slab layout schemes and its advantage and disadvantage is presented, and the assembly floor slab standardization scheme is proposed to promote the application of assembly floor slab in steel frame structures.

关键词： steel frame structures assembly floor slab Standardization modulization

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Construction of multi-functional open modulized Matlab simulation toolbox for imaging ladar system

Construction of multi-functional open modulized Matlab simul...

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International Symposium on Photoelectronic Detection and Imaging 2011 - Laser Sensing and Imaging and Biological and Medical Applications of Photonics Sensing and Imaging

作者： Wu, Long Zhao, Yuan Tang, Meng He, Jiang Zhang, Yong Harbin Inst Technol Dept Phys Harbin 150001 Heilongjiang Peoples R China

ISBN: (纸本)9780819488336

Ladar system simulation is to simulate the ladar models using computer simulation technology in order to predict the performance of the ladar system. This paper presents the developments of laser imaging radar simulation for domestic and overseas studies and the studies of computer simulation on ladar system with different application requests. The LadarSim and FOI-LadarSIM simulation facilities of Utah State University and Swedish Defence Research Agency are introduced in details. This paper presents the low level of simulation scale, un-unified design and applications of domestic researches in imaging ladar system simulation, which are mostly to achieve simple function simulation based on ranging equations for ladar systems. Design of laser imaging radar simulation with open and modularized structure is proposed to design unified modules for ladar system, laser emitter, atmosphere models, target models, signal receiver, parameters setting and system controller. Unified Matlab toolbox and standard control modules have been built with regulated input and output of the functions, and the communication protocols between hardware modules. A simulation based on ICCD gain-modulated imaging ladar system for a space shuttle is made based on the toolbox. The simulation result shows that the models and parameter settings of the Matlab toolbox are able to simulate the actual detection process precisely. The unified control module and pre-defined parameter settings simplify the simulation of imaging ladar detection. Its open structures enable the toolbox to be modified for specialized requests. The modulization gives simulations flexibility.

关键词： Laser optic LADAR simulation Matlab toolbox Simulation facility modulization Standardization

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modulization of four-stroke single-cylinder spark-ignition air-cooled engine models

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING 2007年第D8期221卷 1015-1026页

作者： Wu, Y-Y Chen, B-C Hsieh, F-C Natl Taipei Univ Technol Dept Vehicle Engn Taipei 10608 Taiwan

In order to satisfy different requirements for engine design and real-time simulation, modulization technology is used in this paper to establish the engine model for small-scale engines. The model consists of simple and complex modules of charging, torque, friction, and crankshaft dynamics, which are established in Matlab/Simulink and verified using the experimental data. Different sets of these modules can be selected for various applications. For engine design, a complex model, which consists of the wave-action charging module and the mean-value combustion module, is employed to study the effects of inlet and exhaust systems on torque output performance. For real-time simulation, different levels of complexity can be selected according to the hardware-in-the-loop requirement of the control verification.

关键词： modulization engine model engine design real-time simulation hardware-in-the-loop

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Research on the General Test System of the Ground Equipment in Launch Site Based on the LXI Bus

Research on the General Test System of the Ground Equipment ...

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3rd International Symposium on Test Automation and Instrumentation

作者： Tong Jiang Cai Yuanwen Acad Equipment Command & Technol Beijing 101416 Peoples R China

ISBN: (纸本)9787510020841

With the development of the aerospace project in our country, especially carrying on the manned aerospace missions continuously, informationization and intelligentize of each system and equipments of launch site is put forward higher request. This paper analyses the current test condition of the ground equipment of launch site in our country, aims at the shortage, setting up an overall design scenario about the test system of the ground equipment of launch site based on the LXI bus, and analyses the feasibility of new project, the scenario includes two parts, design of hardware and software. This paper's achievements will provide theories support to aerospace launch site informationization construction of our country.

关键词： LXI Bus Launch Site The Ground Equipment Test System Informationization modulization

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Research on the General Test System of the Ground Equipment in Launch Site Based on the LXI Bus

Research on the General Test System of the Ground Equipment ...

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第三届国际自动化测试与仪器仪表学术会议

作者： Tong Jiang,Cai Yuanwen (The Academy of Equipment Command & Technology,Beijing 101416 China)

With the development of the aerospace project in our country,especially carrying on the manned aerospace missions continuously,informationization and intelligentize of each system and equipments of launch site is put forward higher *** paper analyses the current test condition of the ground equipment of launch site in our country,aims at the shortage,setting up an overall design scenario about the test system of the ground equipment of launch site based on the LXI bus,and analyses the feasibility of new project,the scenario includes two parts,design of hardware and software. This paper's achievements will provide theories support to aerospace launch site informationization construction of our country.

关键词： LXI Bus Launch Site The Ground Equipment Test System Informationization modulization

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Research and Development of A Small Wheel-pedrail Patrol Robot in Forest

Research and Development of A Small Wheel-pedrail Patrol Rob...

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2010 International Conference on Intelligent Computation Technology and Automation(2010 智能计算技术与自动化国际会议 ICICTA 2010)

作者： Xiuli Guo Huaimin Lu Peng Sun College of Mechanical and Electrical Engineering Northeast Forestry University Harbin China

ISBN: (纸本)9781424472796

A small robot of combining wheel with pedrail for the rugged forest terrain is researched and developed in this paper. The robot consists of a walking mechanism, an elevating mechanism, a navigation positioning module, a wireless communication module, and some peripheral sensors. The principles of the light weight and the modularity are adopted to realize the high trafficability and quick assembly. The test shows that the robot has high trafficability and it can cross over the vertical obstacle of 100 mm height or the horizontal ditch of 300 mm width, and the maximum running speed is 1 m/s. Furthermore, the environmental information including the temperature, the humidity, the wind speed, the surroundings, and the real position can be transmitted to an upper computer by the wireless communication for operator to judge and make decision, which can highly improve the efficiency of the forest fire prevention and the forestry resource protection.

关键词： wheel-pedrail patrol robot trafficability modulization

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