The effluent from the landfill leachate membrane filtration concentrate was used as the research object, and the diatomite-loaded nano-Fe3O4 was prepared as a catalyst to catalyze the ozone treatment concentrate. The effects of initial pH of solution, volumetric flow rate of ozone, and dosage of catalyst on treatment efficiency were investigated. The results showed that when the initial pH of the solution was 7, the volumetric flow rate of ozone was 1.0 L·min-1, the dosage of catalyst was 0.8 g·L-1, and the reaction time was 90 min,the chemical oxygen demand（COD） and UV254 removal rates were 67.8% and 86.3%, respectively. 3 D-EEM and GC-MS analyses of the influent and effluent water showed that after the catalytic ozonation treatment, the refractory substances such as humic acid, fulvic acid and tryptophan in the concentrate were greatly reduced; the mass fraction of alkanes, phenols and heterocyclics decreased, while alkane deravatives increased. It is indicated that the diatomite-loaded nano-Fe3O4 catalyzed ozone has a good treatment effect on the concentrate.
In this paper,a mathematical model of second-order inverted pendulumis built.The conventional proportional?integral-differential(PID)control and fuzzy controlare combined,and a fuzzy PID controlleris designed.The adaptive fuzzy tuning of PID parameters is obtained.Simulation results show the designed fuzzy PID controller can well realize the propped balance control of second-order inverted pendulum,the control effect is obviously better than the conventional PID controller,the overshoot and adjust time is small,and has a good anti-jamming capability.It is very suitable for the stability control of the model of second-order inverted pendulum.
The progress of removal and transformation of inorganic nitrogen including ammonium,nitrite,and nitrate by the resting cells of Marichromatium gracile YL28 were investigated in this work.The YL28 resting cells could remove nitrite and nitrate efficiently under the anaerobic condition with appropriate temperature and pH value.They also showed a low transformation capability of ammonium to nitrate,and the reciprocal transformation between nitrite and nitrate could be detected,followed by nitrite or nitrate products disappeared.But the transformation of nitrite and nitrate into ammonium could not be detected.These results demonstrated that the YL28 resting cells could remove nitrite and nitrate from waters efficiently,suggesting that the strain YL28 possesses good capability of anaerobic denitrification.
In the collision detection of the industrial robot model,an improved octree method based on combination of AABB and OBB is put forward.Firstly,in various rod model coordinates,each improved bounding box of manipulator model by octree is built;secondly,the triangles numbers in the model box are stored in an array of corresponding leaf nodes;and the pose of bounding box is translated to the pose in the base coordinates systems,then collision detection is done using OBB separation axis theory;next,the corresponding triangle in the leaf nodes is found by index ordinal,then triangular surface precise intersection is done;finally,an application is built and simulated.The results have proven that the application can quickly and accurately detect the collision and run smoothly.
The strategy ofOne Belt,One Road,as a historical symbol of the ancient Silk Road,taking the peace,development and win-win cooperation as the theme of our times,actively gives us to develop economic partnerships of coordination with countries around,and aims to build a community of common interests,common responsibilities and a shared future in political mutual trust,economic integration and cultural inclusiveness,which is a great project of deepening our reform and promoting our neighbor diplomacy. Located in China's southeast coast,Quanzhou as a port city,has a long history full of vigor and vitality. Under the construction of the 21 st Century Maritime Silk Road,we need to actively seized the opportunity and face the challenges ahead in order to achieve the glorious reputation of this ancient oriental port.
To investigate the engineering properties of typical soft soil at Fuzhou Metro Line 1 and its influence to envi-ronment,some tests were conducted,such as the scanning electron microscope,X-ray diffraction analysis,physical and mechanical experiments,respectively.Based on the engineering geology and construction parameters,the ABAQUS nu-merical simulation analysis about soft soil influence to environment was presented.The results show that:the soft soil consists of voids and micro soil aggregates,and there exist the self-similar characteristic among the samples with different magnifications.The soft soil contains quartz crystal,with poor engineering properties.The calculation ground settlement and tunnel segments stress after 20 m excavation and 800 d consolidation agree with the similar engineering surveyed re-sults.The max settlement of ground surface is 18.5 mm,which is not completely converged.
Multi-functionality of agriculture development is the new coordinate of modern agriculture and sustainable human development. Agriculture,with functional elements,is embodied in human civilization. Modern multi-functional agriculture is the integration of biosphere and regional features and social circle concerning production and operation.Therefore,humankind is expected to advocate the multi-functionality of agriculture in the process of modern agricultural production,and respect the objective laws of the nature as well. Meanwhile,modern multi-functional agriculture is endowed with its unique humane characteristics,namely human's strong intervention,maintaining and creating regional culture,humanistic care,and adopting cultural activities to develop agriculture. Hence human beings is supposed to promote the inheritance and innovation of agricultural humanity and culture when conducting agricultural production.
For the high computational complexity of detecting races in the programmable logic controller,a race detection method based on ladder diagram is proposed.The relation graph is defined,and a method is presented to transform ladder diagrams into relation graphs.It is proved that races depend on loop structures in a relation graph.According to it,a criterion is presented to judge whether a ladder diagram is free of race.The results show that this method can quickly detect the free of race in ladder diagrams,and its computational complexity is polynomial.
Suppose {Xn ,n≥1}is a standardized non-stationary Gaussian sequence.The almost sure central limit theorem for maxima and partial sums is derived under some conditions on the covariance function and the constant sequence {un,i , 1≤i≤n,n≥1}.The result generalizes the one obtained by Zang Qing-pei.
With the introduction of fractal analysis,the fractal dimension of Quanzhou Bay coastline is calculated,to determine the state of Quanzhou Bay shoreline change.According to time series data,based on the coastline fractal grid method,the coastline fractal dimension of overall Quanzhou Bay shoreline and branch coast Quanzhou Bay shoreline is discussed,the change process of the overall coastal and sub-coastal section fractal dimension is analyzed,the value variation of the fractal dimension is tentatively regarded as a judgment based on the severity of coastline erosion.The results show that:the fractal dimension is a benign characterization parameters of Quanzhou Bay shoreline;whether coastline change is in dynamic equilibrium steady state or unstable state can be judged by the trend of the fractal dimension change of the coastline;the variation of amplitude of the fractal dimension of Quanzhou Bay is greater than the magnitude of change0.035,indicating the degree of shoreline erosion and siltation is serious.
Based on error back propagation algorithm,the mathematical model of stamping size and shape error for light emitting diodes(LED)heat dissipation body was established.Explain the specific process to solve the error mathematics model using MATLAB neural network toolbox.Based on a product of LED heat dissipation body,used the related simulation data and the designed MATLAB program to solve the mathematical model of stamping size and shape error for LED heat dissipation body.Verification results showed that the overall value was matched and the local deviation was little for the comparison between the experimental value of the wall thickness distribution and the mathematics model predicted value of that in this paper,the established mathematical model of stamping dimension-error and shape-error for LED heat dissipation body has fine practicality.
In this work,the air flow patterns and particle concentrations of three pharmaceutical clean rooms were stud-ied using computational fluid dynamics (CFD)simulation.A standard k-εdouble-equation model was used to simulate the distribution of particles in the clean room and analyze the rational pollutant dissemination position and distribution ratio. By comparing the differences between the results of the referenced dust content and the measured data,the pollution emis-sions were determined according to the measured data.And the corresponding cleanliness was calculated by changing the dust content per unit volume (DCPUV)to get the best DCPUV value which was in accordance with the experimental da-ta.When the DCPUV reached 1 000 pc·(m3 ·min)-1 ,the numerical simulation results and experimental data of each room fit well,and the cleanliness of three rooms is consistent with the observed trends by the CFD predictions.
A scintillation index measuring system based on embedded MCU of ARM9 is designed.The scintillation index of laser beams in a real turbulent atmosphere is experimentally measured,and the experimental result shown that the scintillation index of a Gaussian beam increases with the increasing of the propagation distance.Moreover,at the same location,the scintillation index is larger in a stronger turbulent atmosphere.
Based on the selection and analysis of corporate strategic objectives and implementation of the project portfolio of large-scale construction enterprises,the portfolio evaluation system is established,in order to achieve their overall strategic objectives and enhance the core competitiveness as the goal.Using a combination of fuzzy comprehensive evaluation and data envelopment analysis(DEA),build a decision model in large-scale construction enterprises of multi-project portfolio is built based on strategic orientation.The effectiveness the model is validated by five projects in large-scale construction enterprises.The results show that the portfolio evaluation system in large-scale construction enterprises of multi?project portfolio based on strategic orientation reflects more scientific consistency of corporate strategy and multi-project implementation,and the decision model on multi-project portfolio decisions is more scientific,can effectively decrease the project portfolio decision deviation caused by the subjective factors,can provide an effective way to measure and project portfolio decisions for large construction business decision-makers.
In order to resolve the missing judgement in detecting arc fault,a new detecting method is put forward in this paper.The electromagnetic radiation signal radiated by arc fault is obtained through a capacitive coupling method,aimed at increasing the gain of the radiation signal radiated by arc fault of low amplitude,a logarithmic amplifier is applied to compress the radiation signal,the output of the amplifier is processed into pulse signal via a comparator.Finally,the detection of arc fault is achieved according to the characteristics of the width of pulse signal.Prototype development and test result show that this method has an ideal detecting precision for both series arc fault and parallel arc fault,it is suitable for both series and parallel arc fault detection.
In the view of field-programmable gate array(FPGA)combinational logic program,this research proposed an ordinary Petri net modeling method.First,a state variable is represented by apair of places,while a logical operation is described by a transition.Consequently,a system program can be modeled by a common Petri net.Then,based on the dynamic analysis capability of Petri net,the computing method of system state reachable graph is given,and achieved the equivalence description of operational process between state reachable graph and FPGA combinational logic system.The results show that the Petri net can accurately describe the logic of the relationship between variables.The proposed method in this paper can be used for the formal design and verification of FPGA combinational logic program.
Under the asymmetric information perspective,the large-scale public construction project decision making is investigated in situ.The current situation of the construction project investment decision-making data results shows that the only 7.46% of the public,11.43% of experts and 12.50% of large public constructer are satisfactory with of decision?making.Using SPSS 16.0statistical analysis method,the influence of the project decision-making are analyzed.Four decision-making main entities include the government,operators,experts and public.The average influences of four main entities are 4.37,3.70,3.40,and 2.27 in the project life cycle stages of the project life,the feasibility study stage,and bidding stage.The influence game pattern of the different entities forms gradually.Some suggestions are put forward,such as investment-construction separation,expert empowerment,public empowerment,constraints of investment decision-making behavior and protection of public interests in large-scale public construction investment decision-making.
Different sampling methods would affect tooth profile deviation in involute tooth profile measurement,while the standard has provided anything about it.In this paper,based on the sampling theorem,first of all,the sampling frequency of the tooth profile would be determined by critical frequency of tooth profile shape deviation,then the relationship between the accuracy class and the tooth surface roughness standards is used to determine the theoretical sampling in the longitudinal direction of the tooth profile expanded,and finally the experiment of tooth profile deviation sampling is conducted and verified.The results demonstrate that the method is feasible.
This paper proposed an information hidden algorithm which was based on high efficiency video coding (HEVC)intra-prediction modes.Firstly,this algorithm uses Arnold transform and turbo coding method to get a binary information sequence to be embedded.Then,combine with the process of intra frame mode selection,we hide information by modulating the best prediction modes′parity of I frame luminance block′s coding units.Since the hidden information only be embedded in I frame,during the extraction,only partial decode the steam is needed,we don′t need decode the steam completely and don′t need original video either.Besides,the real-time performance is good.Experimental results show this algorithm only has a little influence on video quality and bit rate and also can ensure a considerable information hiding capacity.Therefore,it is conform to the basic requirements of video hiding algorithm.
The finite element model of engineering prototype of cable-suspended structure of liquefied natural gas pipe-lines with rigid deck slab is established,and the static,modal and pigging response are carried out.The whole displace-ment curve of cable-suspended structure under dead load,meets the design accuracy by comparison with the design data;The first three rank modes of cable-suspended structure of liquefied natural gas pipelines are in-plane vibration of bridge, the vibration of main cables appears at the fourth rank,the out-plane vibration of bridge deck appears at the sixth rank. Mid-span vertical displacement-position of pigging ball curve of pigging ball taking 120 s and 110 s to cross suspended structure develops completely,appearing two wave crests and one trough,and the shape of whole curve is similar to the shape of static analysis.With the time of pigging ball through bridge decreases,the development of curve is more and more incomplete,the position of the first trough moves continuously to the right of axis,the second wave crest does not appear,when the crossing bridge′s time is 30 s or 40 s,the curve of even does not appear the first trough.
