Accurate accommodation evaluation is important for the development planning of wind power. However, it is difficult to obtain the detailed time-sequence data of wind power output during planning stage and the typical evaluation method of time-sequence accommodation is difficult to be applied, so it is necessary to research the evaluation method of accommodation capacity based on the limited wind resource probabilistic; characteristic data. This paper proposed a functional minimization model which took maximum wind power accommodation as target based on probability production simulation and a practical evaluation algorithm based on heuristic; method. This method only needed the probability distribution information of wind resource and could solve the problem of lacking detailed wind power data during planning stage, which also had a fast computation speed. Based on the actual running data in 2018 and planning data in 2020 of a large wind power base in northern China, the simulation analysis was carried out. The actual wind power accommodation results in 2018 were compared with the simulation results, which could validity the correctness of the proposed method. Finally, according to the planning data in 2020, this paper analyzed the saturation trend of wind power accommodation and installed capacity, and quantitatively studied the promoting effect of flexible measures on wind power accommodation, which could provide some suggestions for wind power planning.
After analysis for the defects and limitations of the existing calculation have been put forward. Regarding the unawareness about a percentage of brick dregs in the recycled aggregate, it designed a test about the water absorption of recycled aggregate with brick dregs and studied the features of water absorption of recycled aggregate with different proportions' brick dregs. Based on the existing calculation methods, it put forward a calculation method of the additional water in the mixing proportion design about the recycled aggregate with brick dregs allocating recycled concrete. It has certain value of application and promotion.
based on the theories and methods of information resource planning, spatial information resource management and smart city construction, this paper established a workflow model of spatial information constraint in smart city, and discussed the implementation method of the model in the form of an example, verifying the feasibility, effectiveness and advantages of the model.
The distorted river bends often occurs in the lower reaches of the Yellow River, which poses a great threat to the life and property safety of the people in the beach area. It also brings many difficulties to the safe operation and defense of flood discharge and river regulation projects. Scholars at home and abroad have done a lot of research on the abnormal river regime, and have achieved good results by adopting artificial bending and straightening or river engineering regulation measures to control the distorted river bends. After the artificial cutting of Donglu reached the goal of lowering the Tongguan elevation, but the reasonable cutting ratio, cutting section and other conditions should be chosen to achieve successful cutting and good results. In the future, the occurrence mechanism and evolution rule of abnormal river regime should be discussed deeply, and predictive research should be carried out to eliminate or mitigate the harm of abnormal river regime.
Man refers to the network that provides various information services within the city scope. The network service delivery point (PoP) of operator man is the entrance that provides network services, connecting the home broadband, enterprise Internet access and other traffic to the Internet. Traditional man face of the high cost of data communication equipment capacity and fixed position, control and transmit ability does not match, scalability is poorer, difficult management operations, unbalanced resource utilization, such as the high cost of expansion problem, in this paper, on the basis of the status quo analysis of the traditional metropolitan area network, put forward the new man VBRAS target architecture, combed the man DC overall flow model, a metropolitan core DC metropolitan area core D deployment plan and selection principle.
Based on the non-navigable span continuous girder bridge of Hong Kong-Zhuhai-Macau Bridge, the effect of water-structure interaction on dynamic characteristics of the bridge is studied. Acoustic fluid-structure interaction method is used to simulate the hydrodynamic effect, the results of eigenvalue analysis and frequency response functions of displacement are presented under six cases of water depths. The influence of water depth on nature vibration frequency and amplitude of resonant peak is studied. The results show that as water depth increasing, the natural vibration frequency decreases but the amplitude of resonant peak doesn't keep increasing. Besides influence on vibration frequency and amplitude are both more obvious to higher modes.
In order to study the influence of rainfall type on the transport characteristics of rain in subgrade soil, a model for analyzing the transport characteristics of porous media was established. Based on the seepage theory of porous media, the influence of rainfall type on the velocity distribution, pressure distribution, phase distribution and temperature distribution of rain in subgrade soil was analyzed by computational fluid dynamics (CFD). The results show that the influence of rainfall type (rainfall intensity) on the transport characteristics of rainwater in subgrade soil is obvious. Under the condition of porosity 0.72, the rainfall type I (rainfall intensity $\pmb{2.8}\ \mathbf{mm}/\mathbf{h}) > \mathbf{type}\ \mathbf{II}$ (rainfall intensity 2.6 $\mathbf{mm }/\mathbf{h}) > \mathbf{type}\ \mathbf{III} (\mathbf{rainfall}\ \mathbf{intensity}\ \pmb{1.6}\ \mathbf{mm}/\mathbf{h}) > \mathbf{type}\ \mathbf{IV}$ (rainfall intensity 1.4 mm / h). The research results will provide important guidance for pavement structure design.
Aiming at the measurement of non-metal resilience rate, this paper proposes a measurement system with grating ruler sensor as the core and microcontroller, monitor, keyboard and printer as the auxiliary. Through the design of the hardware and the development of the software in the system, the purpose of the test is achieved.
In this paper, for the four research sites, Sanhe, Dingxing, Gaocheng and Quzhou, in central and southern Hebei, crop growth simulation model method is applied and five major varieties' temperature and light production potential and rain-fed production potential in 49 years from 1959 to 2007 are simulated. The results show that temperature and light production potentials of Han 6172 and Shixin 828 are higher than those of the other three varieties, and the production potentials of temperature and light from high to low are Gaocheng, Quzhou, Dingxing and Sanhe. There are significant differences in production potential of temperature and light among different varieties and different years in various sites. However there is no significant difference in the interaction between sites and varieties. Taking natural precipitation as water source, production potential difference in different years is very significant. Sites and varieties have great influence on the potential of rain-fed production. Therefore, it is necessary to select wheat varieties suitable for local natural conditions under rain-fed condition.
In order to study the ductility of reinforced concrete columns under the influence of different parameters, six reinforced concrete column models with different design parameters were fabricated based on the pseudo-static test of large-scale reinforced concrete columns. The failure modes of reinforced concrete columns under the influence of different column height, longitudinal reinforcement ratio and chloride ion erosion were studied. The hysteresis curves and skeleton curves obtained from the test were analyzed, and the relationship between the displacement ductility of reinforced concrete columns and three influencing factors was obtained.
In deep sea mining, not very ore can be break into spherical particles. There may be bar-shaped and triangular particle. In this context, coupled calculations are performed by using EDEM -FLUENT is used for coupled calculations and the DEM is used in the calculation of solid-liquid two-phase flow. This method considers the collision among particles, so it can provide a new idea for the study of solid-liquid two-phase flow in deep-sea mining. By simulating the calculation of the irregular particles, it shows that the bar-shaped particles are very destructive in the liquid phase. In mining, bar-shaped particles must be controlled at less than 6% of the total mass of the solid phase to ensure the efficiency and fluency of the pipeline transportation. It is verified by experiments.
Since the 20th century, many scholars have done a lot of research on the movement law of bedload particles. The existing theory of bedload movement is basically based on uniform sediment, while the theory of non-uniform sediment movement is mostly based on uniform sediment theory. Since Gilbert's classical flume test, a great deal of research results have been achieved in theoretical analysis and experimental research. Bed load transport model has been established based on the mechanism of sediment movement, fully considering the interaction between water and sediment, accurately grasping the law of bed load and sediment movement, and statistical law of particle micro-movement. It is possible to avoid various unreasonable factors from the mechanism.
Security model is an important subject in the field of low energy independence complexity theory. It takes security strategy as the core, changes the system from static protection to dynamic protection, and provides the basis for the rapid response of the system. A large number of empirical studies have been conducted to verify the cache consistency. The development of object oriented language is pure object oriented language, and the other is mixed object oriented language, that is, adding class, inheritance and other elements in process language and other languages. This paper studies a new object-oriented language application, namely GUT for a write-back cache, which is based on the study of simulation algorithm to solve all these challenges in the field of low energy independence complexity theory.
Nowadays, the acoustic detection (AD) of partial discharge (PD) is widely used for defect diagnosis of gas insulated substations (GIS) in normal operation and factory tests, including the live detection, on-line monitoring, and offline tests etc. In this paper, in order to design and develop a general fast analysis algorithm model for PD acoustic detection (AD) system to make an assistant diagnosis, the characteristic of acoustic emission (AE) signals generated by different artificial defects such as protrusions (corona discharge), floating shield (floating discharge), void in spacer (inner discharge) and bouncing particles are investigated in the HV laboratory. Some meaningful parameters behind the detected AE signals are extracted and discussed with showing the discharge pattern of (Δ t i , qi) and (t i , q i ) respectively, which are used to distinguish the background noise, PD phenomena or bouncing particles. The results show that the data generated from the discharge tests of the defect models can be used as a sample library for artificial intelligence learning, which can be processed to form a general intelligent analysis model algorithm for GIS PD acoustic detection.
To meet the requirements of the reverse engineering analysis and the expression of the three-dimensional geometric model, the reverse engineering of the three-dimensional geometric model of cattle hoof that takes the multivariate function decomposition into consideration is constructed. The definition, basic operator and multivariate function decomposition of the multivariate function decomposition are briefly described. In addition, the characteristic analysis process of the three-dimensional geometric model for the cattle hoof that takes the multivariate function decomposition into consideration is provided. The multivariate function decomposition is used to organize and express the reverse engineering of the three-dimensional geometric model of the cattle hoof, and the unified organization and storage method for the reverse engineering of the three-dimensional geometric model of the cattle hoof is designed to achieve the analysis and dynamic reconstruction of different dimensional structure characteristics of the three-dimensional geometric model of the cattle hoof. Subsequently, the reverse engineering of the three-dimensional geometric model of cattle hoof that takes the multivariate function decomposition into consideration is constructed. The verification through case study shows that the method put forward in this paper can reproduce the reverse engineering characteristics of the three-dimensional geometric model of the cattle hoof relatively well and can achieve the perspective of the three-dimensional geometric model of the cattle hoof.
Cable-stayed bridges are prone to suffering from seismic excitations with spatial variability. In this paper, A floating cable-stayed bridge with 420-m-long main span was selected as an example bridge. Cable sliding friction aseismic bearings (CSFABs) were applied to this bridge to change the transfer path of seismic load and reduce seismic response of vulnerable components. Aseismic performance of this bridge is evaluated with fragility analysis. To comprehensively evaluate the aseismic performance of this bridge, joint probabilistic seismic demand model and Monte Carlo simulation are combined to obtain system vulnerability. System vulnerability curves of nine cases under non-uniform excitation are generated to analyze the influence of site effect and incoherence effect. The result indicates the system fragility falls between the lower and upper bounds and the bridge as a system is more fragile than any one of the bridge components. With the local site type along the propagation path turns from firm to median and soft, the vulnerability of the whole bridge increases. The cable-stayed bridge becomes more fragile with the increase of incoherence effect, and the influence is more obvious than local site effect. The damage probability of the cable-stayed bridge under non-uniform excitation is much higher than that under uniform excitation. Without consideration of spatial variation would overestimate the aseismic behavior of cable-stayed bridges.
This paper introduces five splicing methods between the precast columns and the cap beam or footing: Wet Joint connection, socket connection, grouted splice sleeve connection, grouted ducts connection, UHPC connection, and the grouted ducts connection between each section of the column, reviewing various types of connection structure, construction characteristics and seismic performance from two aspects of experimental research and engineering application, in order to provide reference for domestic research peers and promote the application of the precast column system with the same effect as the cast-in-place column (CIP) in China.
In order to evaluate the seismic behavior of reinforced concrete columns strengthened with basalt fiber reinforced polymer (BFRP), the refined three-dimensional finite element model of reinforced concrete piers strengthened with BFRP is established by ABAQUS. After that, the quasi-static simulation is carried out, and the hysteretic behavior of reinforced concrete piers is analyzed. The results show that the plastic deformation capacity, energy dissipation capacity, ultimate bearing capacity and collapse resistance of the standard reinforcement pier, low reinforcement pier and steel corrosion pier are improved. It can be concluded that the BFRP on reinforced concrete columns can significantly improve the piers' seismic behavior.
The cost management of traditional construction projects has the following shortcomings. The calculation accuracy of engineering quantity in bidding quotation is not high; the drawing is not easy to identify; call of historical data is inconvenient; dynamic management and refined management are lacking. This article discusses the connotation of BIM technology specifically and the application of BIM technology in cost control management of construction project. BIM technology can improve the quality and efficiency of cost management, and has become one of the main trends in the development of construction. BIM technology has significant advantages. Applying it in cost management can help reduce engineering costs to a large extent, promote the progress of the project, and gain good practical results.
The urban heat island (UHI) phenomenon has been studied extensively. There are also urban cool island bodies, such as water and green spaces, but relatively fewer reports explored the urban cool island (UCI) phenomenon. The goal of this work is to find the effective urban channel water pattern to bring down the temperature in summer. The relevant elements of water cooling effect were identified by Dalton's law of evaporation, and “land's cool island region” was put forward to indicate the cool island's effect on exploitable land. The landsat+Thermal Infrared Sensor (TIRS) date and Envi softwear were applied to obtain the land surface temperature and the spatial characters. Analysis results indicated that with the increase of water's width, the range of “land's cool island region” is amplified, but the efficiency of unit width water's land's cool island region is decreasing. This work puts forward “narrow section, dense water network” as an urban water environment planning layout pattern based on the efficiency of unit width water.
