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The effects of air pollution on people, the environment, and the global economy are profound - and often under-recognized. Air pollution is becoming a global problem. Urban areas have dense populations and a high concentration of emission sources: vehicles, buildings, industrial activity, waste, and wastewater. Tackling air pollution is an immediate problem in developing countries, such as North Macedonia,...
In this paper, through-silicon-via (TSV) dispensing is introduced to address the underfill challenge for a 3-D chip stack package. An edge flood failure would form if the underfill flow breaks through the planar sidewalls of a 3-D package. The edge flood failure could lead to an incomplete underfill and the occupation of a huge area on the substrate. In order to avoid an edge flood, the encapsulant...
The structure was introduced, status of parallel-type Electrostatic Fabric Filter were researched, and the factors influencing collection efficiency were analyzed in the paper. With software of Gambit which also meshed the calculating region, Three-dimensional structure model of the precipitator was established. And then the numerical simulation of the air distribution characteristic was carried on...
Abstract-The dynamics model based on aeromodelling uses computer control technology and GPS positioning. The coverage and flying precision of unmanned aircraft can be increased greatly. Effective control of observation area is achieved. It takes lots of time to calculate the path points if traditional continuous path control algorithms are adopted. It is not conducive to real-time control of aircraft...
The inhalable particulate matter (PM10) samples in environmental air was collected in 2008 during heating period and non-heating period at four sampling sites in the urban of Lucheng ciy. Applying 'nested chemical mass balance' and related environmental air particulate data in Lucheng city, the author successfully analyzed the contributions and ratios of individual sources to urban raised dust, the...
In order to study the displacement ventilation system in winter, TVOC concentration field, velocity field and temperature field are simulated by FLUENT software which use standard k-ε turbulence model combined with wall function method. The study conclude that in winter displacement ventilation can be achieved by using ceiling radiant heating system and warm air-curtain which is set in the cold wall.
The supported catalyst was prepared with transitional metal Co as the active component and the granular active carbon as the carrier. The catalytic wet air oxidation of methyl orange simulated wastewater with chlorine dioxide as oxidant. The optimal conditions were as follows:pH was 2, the dosing quantity of chlorine dioxide was 24 mg/L and catalyst was 60·g/L-1, reaction time was 60 min, the maximum...
Mathematical modeling represents an efficient method allowing us to examine properties of a researched object. This article will present the design of an analytic model of a jet engine (MPM-20 engine in particular) that will be used to set the operational envelope of the engine for further use in a control system that will be limited by this envelope.
In this paper, the engine optimal matching is done to improve the efficiency of a turbocharged lean-burn LPG engine by optimizing the compression ratio and the distribution phase of camshaft. In this way, the gas consumption and emissions of the LPG engine are reduced. A one-dimensional engine model and a three-dimensional in-cylinder combustion model are set up with simulation software. The optimal...
Because of the mutual influence of the parameter between each condenser,the operation characteristic of the refrigerant natural circulating system became comparative complex. In order to analyze the operation characteristic of refrigerant natural circulating system in calefaction working circumstance, the mathematical model based on the refrigerant natural circulating system of gas and liquid phase...
The management of cold storage chain is an important part of the management of supply chain and logistics. The development of Chinese cold storage chain logistics is relatively backward, which affects the food industry seriously. Cold store play an important role in cold storage chain logistics. The field flow is the key technological parameter in cold store. A three dimensional mathematical model...
As a rising transportation system, intelligent transportation system of air-rail links is key factor to establish the integrated transport model system. After building the ITS system frame of air-rail links, this paper describes the objectives and main research content of ITS system integration of air-rail links. At last the public information platform, integrated ticketing, baggage handle system...
This paper investigates the intra-fleet and inter-fleet model for the solution of crew scheduling problem during airline irregular operations. The intra-fleet model is widely adopted in the airline industry where flight is grouped together and works typically within a fleet. The inter-fleet model on the other hand, splits of flight attendant groups and reassign of them across different fleet. Though...
In allusion to China's urgent need for predictive control of the air traffic flow, this paper mainly introduce the research status and the development process of the air traffic flow model through studying the research history and various existing models. It also introduce and analysis five kinds of the mainstream models. Through analysis and comparison, it can be found that each model has its own...
The drying kinetics data of sludge in a paddle dryer were utilised for scaling up of batch dryer and continuous dryer. In the scaling up of batch dryer, the drying kinetics data can be directly used for drying area calculation. The moisture content of sludge at different drying time can also be easily determined. In the scaling up of continuous dryer, the dryer was partitioned into a series of drying...
Due to the configuration complexity of the diesel locomotive air brake system, it is difficult to realize the fault diagnosis on the brake system. In order to enhance fault diagnosis efficiency for diesel locomotive air brake system with uncertain fault, a fault diagnosis model based on Bayesian network is proposed in this paper. According to a priori exact probability or experts estimate that the...
In order to understand the ignition properties of plasma jet, a simulation experiment has been conducted, to explore the characterization of plasma jet propagation in air under different discharge energy. Based on the experiment, a two-dimensional-axisymmetric mathematical model was developed, and the Fluent software was used to simulate the unsteady plasma jet propagation in air. The influence of...
In order to forecast the scale of logistics demand for a new-built airport, economic indicators are used to forecast the scale of logistics demand and the measuring indicator of the scale of logistics demand is studied. The factor analysis and back propagation (BP) artificial neural network theory are applied to set up a model to forecast the scale of the logistics. The application of factor analysis...
In order to eliminate steady-state errors and chatter caused by quantization error of the conventional fuzzy controller, based on the self-adjustment of quantified proportionality factors fuzzy controller, this paper establishes the flexible fuzzy controller, and can achieve the online parameters self-adjusting function. This method is used in inflation process of pneumatic membrane structure, which...
This paper presents a numerical simulation based on computational fluid dynamics (CFD) method on the enhancement of natural ventilation in an industrial workshop with heat source induced by solar chimney (SC). Four types of SC were designed to attach to the top and southern roof of the workshop. Realizable k-ε turbulent model and DO (discrete ordinate) radiation model were used to calculate the air...
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