bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of the effect of Bee Propolis on some biochemical, immunological traits and intestinal microflora of broiler chickens (Ross 308)
Authors: Khalil Ibrahim Mohammed , Hadi Dakhil Al-jebory Hashim
Published: August 2020

This study was conducted to know the effect of adding Bee Propolis to a diet in some biochemical, immunological traits and intestinal microflora of broiler chickens, where 225 unsexed broiler chicks were used, The chicks were randomly divided into five treatments, each treatment was 45 birds, and each treatment was divided into three replicates, each replicate of 15 birds, the Bee Propolis material was added with the diet and at levels (0, 2, 2.5, 3& 3.5 g Bee Propolis/kg feed) and for treatments T1, T2, T3, T4, T5 respectively. The chicks were raised for 35 days, and during the study period, we reached the following results: a significant difference (P<0.05) for the treatment T1 in glucose, uric acid, AST (Aspartate amino transferase) and height significant (P<0.01) in cholesterol concentration compared to the rest of the studied treatments, and a significant excelled (P<0.05) for the T2 treatment in the ALT (Alanine amino transferase) concentration compared with the rest of the treatments studied, The results also indicated that there was significant (P<0.05) increased for T3 and T5 in the protein level, a significant increased (P<0.05) for the T3 in IgG (immunoglobulin Gama) and IgM (immunoglobulin Mua) and T5 in IgA (immunoglobulin Alpha), a significant superior (P<0.05) for T1 and T2 inE.colibacteria in jejunum and superior T5 inlactobacilliin jejunum and ileum meanwhile height significant (P<0.01) for T1 and T2 inE.colibacteria in ileum this is at 14 days for age, while in 35 days for age significant superior for T1 and T2 inE.coli, T4 and T5 inlactobacilliin jejunum and ileum.
Effect of in ovo - injection with Nano-Selenium on hatchability and post-hatch biological parameters in quail
Authors: Abed Abbas Dhyaa , Khalaf Hasan Tariq , Taes Taha Ahmed
Published: August 2020

The selenium considered main element for animals and humans and inter in many biological functions that play important rule in maintenance metabolism in thyroid gland and cell growth and antioxidant, also considered of most important element to immune system by activation of the body immune system. The aim of the present study is investigating effects of nano-selenium in-ovo injection on some hatchability indicators, chick quality and its biological parameters for quail egg . One thousand and fifty fertile quail eggs from flock of department of Tikrit Agriculture Research randomly divided into five treatments (210 eggs each). First was normally without injection (negative control), second was injected with demineralized water (positive control) third, fourth and fifth treatments were injection by 10, 20 and 30 µg Nano-Selenium / egg respectively. The result show significantly improvement in hatchability percentage redaction in early and middle embryonic mortality percentage in addition to this significantly amelioration in hatched Chick quality for third treatment that in-ovo injection with (10 µg Nano-Selenium / egg). While showed fifth treatment in-ovo injection with (30 µg Nano-Selenium / egg) redaction in incubation duration accompany with significant increasing in hatched body weight. It is summarized that, in-ovo injection of different levels of nano-selenium can improve hatchability and chick quality
Effect of Spraying date of boron on Vegetative Growth and Yield of Cotton Plant (Gossypium hirsutum L.) Lashata Variety
Authors: Lahoub Abboud Raad , Ali Al-Assaf Mohammad
Published: August 2020

A field experiment was conducted during the spring season of the year 2018 in the fields of the Cotton Research Unit at the Technical Agricultural College / Mosul to study the effect of spraying the element boron for different dates (the stage of vegetative growth, the stage of opening blooming buds, the stage of boll formation) and the interferences between these dates on the characteristics of vegetative growth and cotton components Lashata cultivar, and used the design of complete randomized block in the implementation of the experiment. The results of the study showed that the date of spraying with boron in the two stages of vegetative growth and flowering buds open significantly exceeds the rest of the dates in the characteristics of plant height (cm) and the number of nodes up to the first fruit branch and the number of vegetable branches and the number of fruit branches in values (135.8 cm, 6.1, 4.5, 16.8) respectively, the duration of spraying with boron in the vegetative stage exceeded the rest of the dates by its effect on the characteristics of the total number of bolls and the weight of one boll (gm), the seed index and the yield of the cast cotton values (36.8, 6.82 g, 4.050, 995.2 kg −1), respectively. the date of spraying is also superior in the vegetative stage of growth significantly on the rest of the dates on the characteristics of its effects type (E and percentage of hair and the percentage of the early) values (42.8, 40.5% staple guide, and 82.15%) respectively.
The Study Effect of field Magnetic on some of average fungi of the soil
Authors: Tiamooz Sulaf H. , Al-Juthery Hayyawi W.A. , Ali Mahmood A.
Published: August 2020

In series of experiment to test effect magnetic series of experiment to test effect magnetic water treatment and use it in agriculture and Environment and leaching salts of soil, the objective of the present work was to fungi determine the effect of Rhizopus stolanifer, Fusarium oxysporium, Fusarium solani, Trichoderma harzianum, Aspergillus niger, That cause pant disease indirect form and use magnetic area direct form in habit or kill pathogenic fungi . the use of magnetic mechanism appear positive result in fungi growth habit for fungi uses’ in experiment. the use of that mechanism signification different from measurement diameter colony growth in petri dish when it use magnetic water or use direct magnetic area that incurrence the colony of fungi. As part of a series of experiments to test the effect of magnetic treatment on pathogenic fungi, their effect on water and their uses for agricultural and environmental purposes and soil washing of salts, the current work aims to use magnetic treated water and observe its effect on Fusarium oxysporium, Fusarium solani, Trichoderma harzianum, Aspergillus niger, Rhizopus stolanifer that cause Plant diseases indirectly and the use of the magnetic field and directly to inhibit or kill pathological fungi. The use of magnetic technology showed positive results in stopping the fungal growth of the selected fungi in the experiment as the use of those Cannula for significant differences in terms of measuring the diameters of colonial growth in dishes, whether when using magnetic water or using the direct magnetic field to which the fungi colonies were exposed
The model of dose formation in the drum batcher with the moving blades within the cells
Authors: Vedishchev S. M. , Alshinayyin H. J. , Prokhorov A. V.
Published: August 2020

The article considers a design and technological scheme of a drum batcher with a variable volume of cells. The mathematical model of the material dose formation in the drum batcher’s cell in the area of loading gate is considered. As a result of the analysis of the mathematical models the boundary conditions of operational integrity, as well as the factors affecting design parameters of the batcher and the material dosing process are determined.
some blood traits and immune system response to Cubeb [Piper Cubebaa] and turmeric [Curcuma longa] feeding in broiler chickens
Authors: Ali Makki Al Rubaee Mohammed
Published: August 2020

This study was conducted in the Poultry house of the animal Production Department at the ministry of science. 360 day-old chicks [Ross-308] were randomly weighed and distributed to eighteen cages by six treatments, each treatment took three replicates, each replicate had 20 birds. herbs plants were added to the diets [Table 1] as follows: [T1 control], Turmeric 0.2% [T2], Turmeric 0.4% [T3], cubeb 0.2% [T4], cubeb 0.4% [T5], Turmeric 0.2% + cubeb 0.2% [T6]. Chicks were fed the experimental diet from 1-35 days of age, results showed no differences between experimental treatment for RBC`s, Hemoglobin %, PCV%, MCV,MCH . MCHC and Lymphocytes %, H/L Ratio, Monocytes %, Eosinophils %, Basophiles % cells, but the immune system response to the dietary supplementation of Cubeb and turmeric was higher than the control.
The efficiency of some plant extracts on the fungus Macrophomina phaseolina, the causes agent of seed rot and the Okra seedlings death
Authors: Abdulabbar Abdulhassan Hala
Published: August 2020

This study included the assessment of the antifungal activity of extracts of Cuminum cyminum, Zingiber officinale and Citrullus colocynthis on the growth of Macrophomina phaseolina. Additionally, the toxicity effect of the fungal filtrate on the percentage of okra seeds germination as well as some okra parameters. The results showed that the alcoholic extract of Cuminum cyminum had a significant effect on the inhibition of the radial growth and dry weight of M. phaseolina followed by Zingiber officinale and citrullus. Among the all extracts, Cuminum cyminum extract gave the highest germination, which was 66%, while the Zingiber officinale and Citrullus colocynthis had lowest effect on the germination by 53.3 and 46.2 respectively. The concentration of 50% tends to have a significant influence on okra seeds germination 55.1% than 25% concentration. The alcoholic extract of Cuminum cyminum had a significant effect at 3% concentration on plumule height, which was 6.2 cm, while zingiber officinale and citrullus colocynthis at the same concentration (3%) had plumule heights of 5.2 and 2.8 cm respectively. Cuminum cyminum extract also had a significant effect on the radiant, which was 1.8 cm. A similar effect on the radiant was examined to zingiber officinale which was 1.5 cm. In conclusion, the Cuminum cyminum extract exhibited a promising effect on some parameters of okra seedlings, especially for high concentrations. All alcoholic extracts under investigation showed an effective effect on infected fungi, in particular, Cuminum cyminum extract.
Research and Application of Waterproof Structure of Coated Flexible Cover Plate
Authors: Liao Dongya , Bao Zhiqiang , Xu Yao
Published: August 2020

This paper introduces the technical principle, technical characteristics and application scope of the brush-coated flexible cover-plate waterstop. With the example of Taihu reservoir CFRD project, the detailed engineering application of the new type waterstop structure is presented, including the design scheme, construction technology and quality control, etc.
Practice and Thinking on the Architectural Design of Kindergartens in Jingkai District of Nanchang
Authors: Chen Xi
Published: August 2020

Based on the concept of “focusing on children’s development”, this paper discusses the architectural design of kindergarten in Jingkai district of Nanchang, and from the aspects of architectural form, shape combination, architectural color, space extension and landscape greening, four design methods are proposed: “FOLD”—variations in heights; “COURTYARD”—multi-tiered enclosure structure; “COLOR”—color interspersion; “GREEN”—green surrounding.
Research on Seismic Behavior of Beam-Column Joints of New Prefabricated Steel Structure
Authors: Zhandong Ni
Published: August 2020

The advancement of technology has changed the function and structure of the building space. The prefabricated steel structure is in a period of vigorous development, which is an important way for the development of industrialization of buildings. Therefore, the key technology of prefabricated assembled steel structure is a key problem that needs to be solved urgently. It is particularly important in the optimization and upgrading of the form of the building structure. At the same time, the design and construction of the beam-column connection node is also crucial, which directly affects the construction process and speed. In this paper, a new type of assembled steel structure beam-column joint is designed, and the seismic behavior of the structure is analyzed through experiments. Experiments show that the structure has good seismic behavior, which not only effectively solves the problem of structural interference, but also reduces the construction process and improves the construction speed.
Analysis of Mechanical Properties of Polymer Matrix Composites
Authors: Zhang WX , Yang LM
Published: August 2020

Polymer materials have obvious viscoelastic properties. Viscoelastic mechanics mainly studies the relationship between deformation and external force, load time, load rate and other factors under the influence of external factors, as well as the stress field, strain field and relevant laws in the object. The deformation of viscoelastic materials is strongly dependent on time and temperature. The viscoelasticity of the material will change with the temperature. If there is no obvious creep at room temperature, there will be significant deformation and flow at higher temperature, and even the phenomenon of material failure will be different. If the temperature changes too much, it will change the mechanical properties of the material.
Analytical Solutions for Thermo-elastic Nonhomogeneous Equations
Authors: Zhang WX , Yang LM
Published: August 2020

When the temperature changes, the stress produced by the external constraint and the mutual constraint between the internal parts of the object, which makes it unable to expand and contract freely, is called thermal stress. The thermal stress is caused by the steady temperature field. When the transient temperature changes to zero and the temperature distribution reaches a stable state, the temperature distribution can be obtained from the heat conduction equation and temperature boundary conditions, and then the displacement and stress can be obtained from the elastic equation including the temperature term.
Analysis of Multi Scale Structure for Plant Fibers
Authors: Zhang WX , Yang LM
Published: August 2020

Based on Hamiltonian theory, a boundary integral method is developed to deal with complex boundary conditions and interface continuity conditions. In addition, based on the micro experiments, the characteristics of micro multi-level structure of plant fibers are systematically studied, and the computational mechanical models of each level are established. Based on Hamiltonian theory, a boundary integral method is developed to deal with complex boundary conditions and interface continuity conditions. In addition, based on the micro experiments, the characteristics of micro multi-level structure of plant fibers are systematically studied, and the computational mechanical models of each level are established.
Study on Transmission Line Structure under Ice Storm
Authors: Zhang WX , Yang LM
Published: August 2020

In this paper, according to the ice storm weather, through the numerical analysis of meteorological records, the movement rule of ice storm weather and the mechanism of action on overhead transmission lines are studied, and the ice storm weather model suitable for overhead transmission lines is established. Then the ice storm weather model is connected with the failure probability of the overhead transmission lines, and the structural reliability of the overhead transmission lines under the ice storm weather is analyzed. Finally, based on the evaluation of the reliability of the lines, the restoration model of the damaged overhead transmission lines is established. So as to provide a theoretical basis for the safe operation of the power grid.
Analysis on the Dynamic Pressure of a Cylindrical Silo
Authors: Zhang WX , Yang LM
Published: August 2020

In this paper, the silo wall and the storage material in the silo are considered as a whole. It is proposed that there is energy conversion between them in the process of loading and unloading. The interaction between them is analyzed and the mechanism of dynamic pressure increase is explored by referring to the method established by the earth pressure theory. At the same time, the energy principle and three-dimensional discrete element are used for theoretical analysis, and a simplified calculation method of silo lateral dynamic pressure is proposed to effectively predict the lateral dynamic pressure field and the range of pressure coefficient.
Research on Application of Single Component Polyurea in Defect Treatment of Expansion Joints of Water Conveyance Structure
Authors: Li Kun , Qian Fuying , Li Meng , Heng Sunzhi
Published: August 2020

According to the operating features of aqueducts of water conveyance structures in cold regions, this paper proposed a flexible rehabilitation plan of water sealing by single component polyurea on the surface of expansion joint of an aqueduct. The author conducted a laboratory test to study the tensile strength, bond strength, impermeability, frost resistance and aging resistance of the single-component polyurea. The results showed that the single component polyurea has strong impermeability and frost resistance, excellent aging resistance, large elongation, and high viscosity with concrete. Therefore, the single-component polyurea is suitable for the defect treatment of concrete expansion joints. In a defect treatment project of an aqueduct in the North, a flexible rehabilitation plan of water sealing by single component polyurea was implemented on the defective expansion joint of an aqueduct, and the operation effect still remained good after 3 years. The flexible rehabilitation plan of water sealing is simple and reliable because it does not damage the overall structure of the concrete and is easy to be maintained.
Research on CAN bus consistency test method
Authors: Wang Jigang
Published: August 2020

As a mature industrial field bus, the CAN bus has been widely used in industrial field control. In the application of multi-node CAN bus, how to ensure the reliable operation of the CAN bus has been widely concerned. The main items, purpose and test methods of sex testing are elaborated in detail, aiming to provide some ideas for how to promote the reliability application research of CAN bus.
Application and Study of 3D Parameterization in Standardized Design of Sluice
Authors: Zuo Weilong , Huan Guosheng , Xu Liping , Liu Zhanwu
Published: August 2020

Sluice is the most important and commonly used control building in water conservancy engineering system. In order to improve the design level of sluice and the utilization rate of social public resources, and facilitate the management of sluice project, It is necessary to carry out 3D collaborative design with Revit parametric family in the application research of sluice standardized design. The goal of design parameterization, construction standardization and management unification is expected. The common sluice project in water conservancy project is adopted as an example in this paper, and the method of building parametric sluice on Revit platform is studied, which provides a reference for the parametric engineering of the basic design industry.
Determination of maximum pile spacing of anti-slide pile with rectangular section considering soil arching effects
Authors: Li Huanhuan , Ni Wankui , Li Gang , Wang Donghong
Published: August 2020

The reasonable determination of pile spacing is an important link in the design of anti-slide pile. At present, there are many research results on the calculation method of maximum pile spacing of anti-slide pile. Due to different assumptions, different angles of analysis, and different complexity of the formula, the calculation results are quite different, and the research results have not been widely popularized. In this study, taking into account the whole soil arching as the research object, the formulas for calculating the maximum pile spacing of the anti-slide pile based on the soil arching effect behind piles or between piles are put forward considering the overall mechanical balance condition and strength condition of the soil arching, and its rationality is verified by an engineering example. Through calculation and analysis, it is considered that the soil arching between piles controls the maximum pile spacing of anti-slide pile. Through the comparison and analysis with the previous research, the results showed that the calculation formula in this paper is reasonable, feasible and simple, and is convenient for popularization and application in actual engineering.
Study on Foundation Treatment Technology of Comprehensive Pipe Gallery in Collapsible Loess Area
Authors: Li Liangcheng , Liu Qi , Ma Jianxun , Jia Rubin , Zhou Wenyan , Luo Dong , Dai Yuheng
Published: August 2020

With the large-scale application of urban comprehensive pipe gallery in China, it is an urgent engineering problem that how to adopt appropriate technical schemes for the foundation of comprehensive pipe gallery under different geological conditions. First of all, this paper starts from the unique stress condition of the comprehensive pipe gallery, through the analysis of the change of the stress on the foundation soil, it comes to the conclusion that the stress on the foundation soil becomes smaller after the completion of the comprehensive pipe gallery structure, and further analyses the influence of the buried depth and section size on the stress change of the foundation soil. Then, according to the foundation treatment scheme of the comprehensive pipe gallery in the collapsible loess area, some optimized suggestions and ideas are put forward, in order to provide more economical and simple foundation treatment measures for the construction of the comprehensive pipe gallery in the future.
Reinforcement and resonance control of head cover of Francis turbine by finite element analysis and modal testing
Authors: Xie Jiemin , Huang Bo , Fu Liang
Published: August 2020

This article discusses the problem of excessive vertical vibration of head cover for Francis turbine installed in Baishi hydropower plant, including its treatment and effectiveness evaluation. In order to build the head cover model accurately, to successfully predict the natural frequencies of the head cover after reinforcement, and to control the resonance risk caused by the close proximity between the natural frequency of the head cover and the water pressure pulsation in the flow passage, the method of combining numerical simulation and experimental measurements is carried out. The results show that the natural frequencies of the reinforced head cover avoid main excitation frequencies of the Francis turbine, and the vertical vibration of the head cover is significantly reduced, with a maximum reduction of 73.6%.
Analysis of the Influence of Bridge Piers on River FlowI-Scouring Calculation
Authors: Deng Chunyan , Ge Hua , Long Rui , Yuan Yuan
Published: August 2020

Many bridges collapsed due to the affection of flow, among which scouring has become one of the critical reasons that leads to flow-caused bridge damages and accidents, therefore the analysis of pier scour is of great benefit for the safety assessment of bridge engineering. Newly constructed bridges on the Fuhuan River, a tributary of the Yangtze River, are selected as the object of study. The scouring effect of flow on the bridge piers are evaluated, as shown in the calculation results, the existing design scheme can meet the bridge safety requirements.
Explore the role of sustainable utilization of water resources and water resources management
Authors: Ma Long
Published: August 2020

Water resources are very important to our lives. Water is indispensable in our lives, and as the economy continues to rise, the demand for water from all walks of life is also increasing. However, due to various problems in the use of water resources in my country, many problems have arisen in the allocation of water resources. Through the introduction of water utilization and management, the article analyzes various difficulties in the process of water resources utilization, and proposes corresponding solutions to these problems, hoping to make my country’s water resources scientifically used.
Research on improved rock blasting damage constitutive model considering compression-shear damage
Authors: Dong Qian
Published: August 2020

It is of great importance to study the proper rock blasting damage constitutive model for the design of rock blasting excavation parameters and the damage assessment of retained rock. Therefore, on the basis of the classic KUS rock damage constitutive model which only involved tensile damage, considering the compression-shear damage of rock near the explosion source caused by extensive blasting load, an improved rock blasting damage constitutive model is established. Meanwhile, the distribution of rock damage zone of a single blasthole is calculated by dynamic finite element software based on the improved model, and the results show that the ratio of crushing zone radius to cartridge radius is between 4.3 and 4.6 under different charging radius, while the ratio of fracture zone radius to cartridge radius is between 78.9 and 83.8, which is close to the existing research results. Thus, the accuracy of the established constitutive model of rock blasting damage is verified.
Study on the impact of different pier structures on navigable flow conditions
Authors: He Chuankai
Published: August 2020

The navigable clearance scale is a key factor in the selection of bridge type schemes on urban navigable rivers, especially in the case of limited clearance, the restriction of pier size and shape on navigation. In this paper, the impact of different pier structures on navigable flow is analyzed through the two-dimensional flow mathematical model simulation of new bridge section of a river. The results show that the shape optimization of square pier chamfer can reduce the transverse velocity of navigable flow; and the larger size of pier, the greater transverse velocity of navigable waters. Furthermore, the transverse velocity of the navigable flow is the smallest on the condition of the same width but round form of head pier structure. The new design can effectively solve the contradiction between bridge navigation and landscape construction on urban navigable river, and provide a variety of options for bridge construction.
Saline water treatment technology for irrigation and water conservancy
Authors: Fang Shibiao , Mu Lin
Published: August 2020

In this paper, according to the special environmental characteristics of South Xinjiang, the circulation heating pipe is designed and its hydraulic characteristics are analyzed by hydraulic numerical calculation, which lays the foundation for field test. According to the characteristics of high heat collection, low heat dissipation and easy installation, the material, single tube structure and general layout of the circulation drying tube are designed.
Underwater Investigation and Analysis of Upstream Face for a Built 40 years’ and 6 km Long Embankment Dam in Africa
Authors: Jinqiu Liang , Jie Tang , Yu Tang , Ji Lv
Published: August 2020

The world’s hydropower has experienced considerable development. With the coming of the post hydropower era, the business of new projects will gradually decrease, and meanwhile, the business of hydropower station renovation and dam maintenance will gradually increase. This paper introduces the methodology and the finding of the underwater investigation, analyses the upstream face stability and recommends solutions of rehabilitation for a built 40 years’ and 6 km long embankment dam in Africa, aiming to provide a reference for similar projects of dam maintenance.
Study on the bearing capacity of micropiles in plateau mountainous area: A case study of a power supply project in a traction station in Sichuan
Authors: Fan RongQuan , Tang Yang , Liu Xiaoyu , Wang Liang , Yuan Lei
Published: August 2020

As a new type of environmental protection foundation, micropile has the advantages of convenient construction, small floor area, and has a broad application prospect. This paper takes a power supply project of a traction station in Sichuan as an example, and uses ABAQUS numerical analysis software to simulate the micro-pile foundation of the project site, then the influence of pile length and pile diameter on the bearing capacity of micro piles is analyzed. Combined with the load-bearing requirements of the transmission line for the foundation, it is believed that the micro-pile foundation in the plateau mountain area is prone to damage due to failure to meet the pull-out requirements. The research results provide a reference for the design and application of the micro-pile project in the plateau mountain area in the future.
Identification of Hazard Sources in Prefabricated Building Construction by Entropy Weight Method
Authors: Liu Yan , Cui Jialin
Published: August 2020

Prefabricated building is the new construction method of technical reform and upgrading in China’s construction industry. The construction of prefabricated buildings involves the production, transportation and hoisting of large prefabricated components. Due to the difficulty in handling large prefabricated components, lacking of prefabricated building construction experience of workers, insufficient management guidelines for prefabricated building, there are a large number of hazard sources in the new production environment. This paper is to identify hazard sources relating to prefabricated components which exist in four stages of production, transportation, on-site storage, and installation. Firstly, we used the method of literature study to initially identify the hazard sources of prefabricated buildings; then, expert investigation was applied and Entropy Weight Method was used to evaluate the severity of hazard sources; finally, significant hazard sources at each stage were identified and countermeasures were put forward for the prevention of accidence. This study enriches the theoretical research on prefabricated building safety management and provides references for the prevention of prefabricated building safety risks.
Optimization of Multi-energy Transfer Considering Internal Interaction and External Collaboration in Micro-Energy Network Group
Authors: Li Junjie , Wu Gaoxiang , Zhou Jingjing , Yang Longjie , Mo Fuxue , Lin Tianhao , Zhou Niancheng
Published: August 2020

Micro-energy network realizes the complementary of distributed energy production according to the characteristics of users’ energy demand and local resource conditions. In order to realize the efficient operation of micro-energy network group, this paper proposed an optimal power transfer model based on Mutual Energy Supporting Pattern in micro-energy network group. The concept of micro-energy network is given and the basic structure of micro-energy network group based on the interconnection of external energy hubs is first established. Then, the micro-energy network model of internal energy hub and optimal power transfer model is established. The optimal power transfer model of micro-energy network group is subdivided into two kinds of operation modes, the internal cooperation mode and the synergy cooperation mode. The internal cooperation mode is to address the problem of energy shortage at the micro-energy network, while the synergy cooperation mode is to solve the problem through the coordination of multiple energy hubs in the micro-energy network group. Finally, the model is validated by a system including electricity, gas, heat/cooling load and external energy hub.
Research on the Behavior of Spatial Steel Truss Confined Concrete under Axial Compression
Authors: Shi Qingxuan , Chen Yunxiao
Published: August 2020

In order to study the axial compression performance of spatial steel truss confined concrete composite columns, the finite element software ABAQUS was used to establish the spatial steel truss confined concrete composite column models. The stress and strain states of the steel truss and core concrete in the composite column are analysed. Then, the influence of parameters such as angle steel size, the spacing and arrangement of steel plate, and strength of the concrete on the axial compression mechanical performance and restraining effect of the spatial steel truss confined concrete are discussed. The research results show that the spatial steel truss can exert a good restraining effect on the core concrete. At the same time, the spacing of steel plate is the key factor that affects the restraining effect of the spatial steel truss on the core concrete.
Research on the Flood Classification for the Lower Reaches of Jinshajiang River
Authors: Yao Chenchen , Ren Zaimin , You Fenghua , Ju Bin , Zhang Yunhui
Published: August 2020

The characteristics of floods in a river and their classification are of great significance for the flood control, risk reduction and water resources utilization as well. This paper investigates the classification of floods in the lower basin of the Jinsha River based on flood area composition analysis and Fuzzy C-means Clustering Algorithm. The results show that the floods in the lower basin of the Jinsha River are divided into upstream type, interval type and tributary type according to their regional compositions; the three types of floods are divided into two categories according to their intensity and morphological indicators using fuzzy C-means. The flood classification of the lower reaches of Jinshajiang River in this study laid a foundation for the formulation of the joint operation rules of the cascade reservoirs in the lower reaches of Jinshajiang River, and the flood control standard of Yibin City could be raised to prevent 100-year flood approximate through the joint operation of the cascade reservoirs, additionally, it is of great importance to recognize the flood inflow as well as their control for the Three Gorges Reservoir.
Measurement and Calculation of Fissure Area and Density for Shrinkage Soil
Authors: Zhao Xiushao , Wang Zhiyao , Chen Kaisheng , Yang Qijing , Geng Daxin , Fu Zhitao
Published: August 2020

Fissure density is an important evaluation indicator of the degree of fissure development for fissure soils, which is not easily measured by traditional methods. A new statistical method based on Visual Basic programming was proposed to calculate fissure density. The basic principle of this method is to convert colour pixels into black-white pixels based on brightness calculation, and then calculate the fissure density according to the proportion of black-white pixels. Through the above methods, the statistics of the fissure density and fissure area of shrinkage soil sample can be realized.
Experimental validation of CFD model with the air velocity and temperature in the plant factory
Authors: Zhou Shenghan , Zhang Xin , He Zhongqun , Liu Huan , Liu Ke , Chen Yufei , Peng Fei , Yang Qichang , Zheng Yangxia , Lu Wei
Published: August 2020

A computational fluid dynamics (CFD) model for the closed plant factory has been developed in this study, the experimental validation of CFD model with the air velocity value was compared with the measured air temperature value. The results showed that the mean relative error of validation with the air velocity was 15%, and comparable with experimentally observed air temperature profile inside the plant factory with RMSE of 3% which shows the utility of CFD to study plant factory microclimatic parameters.
The modified cyclic multi-surface plastic model of sandy soil based on damping ratio
Authors: Zhang Yan , Sun Shulin , Qin You
Published: August 2020

Traditional multi-surface plastic model always overestimates the accumulated plastic strain when it is applied into sandy soil under cyclic loading. Considering this overestimation can be reflected through equivalent damping ratio of the hysteretic loop and the damping ratio can also include the real anisotropic plastic hardening which is simply considered in kinematic hardening rule and isotropic hardening rule, series of strain-controlled cyclic simple shear tests were conducted to obtain the relationship between correction coefficient of hardening rule and initial state including initial effective, then a modified cyclic multi-surface plastic model was established by regarding the subsequent hysteretic loop as the new first loop with a new initial state which is the state at the start of the fourth quarter of the previous loop, thus, the plastic hardening formula can be upgraded in the process of loading.
Xiakou Xiangxi River Bridge structure design
Authors: Zongrun Rao , Ming Li , Zhuoqun Chen
Published: August 2020

Xiakou Xiangxi River Bridge is located in the upstream of the Three Gorges reservoir area. It is a (90+238) m single tower, Leaning Tower central cable surface mixed beam cable-stayed bridge. Its main span adopts a cross the river to meet navigation and flood control needs. The main concrete beam and the steel box girder of the main span are of large-angle inclined web box section with cantilever flange. The steel and mixed surface is at 11.05m across the bridge tower. The full width of the bridge deck is 25.5m. This bridge adopts the oblique “pipa” shaped main tower, the height of the main tower is 126m, composed of the upper tower column, the lower tower column, diaphragm and so on. The tower body deviates from the vertical surface of the bridge by 10° and leans towards the bank side. The foundation of the main tower is an integral pile foundation of the pile bearing platform. 2×17×2 high-strength parallel steel wire stay cables are used to arrange the fan-shaped space cable surface.
Optimization of the construction sequence of the expanding excavation around Tunnel
Authors: Wang Yu-Feng , Wu Li , Sun Miao , Ma Chen-Yang , Yuan Qing
Published: August 2020

With the background of the construction of the Loushan Tunnel, Flac3D software was used to simulate three different expanding excavation sequence schemes. The simulation results were compared and selected, and it determined that Scheme3 is the best scheme. In the construction site, tunnel vault settlement and hance convergence were measured and compared with the simulation results. Conclusions are as follows: ①The final vertical displacement of Scheme.1 was greater than that of Scheme.2 and Scheme.3. In scheme 2, the horizontal displacement of the middle-upper part of the tunnel increased sharply after the excavation of the upper-right part. The maximum bending moment of the supporting structure of Scheme.3 was smaller than that of the other two schemes. In addition, the maximum bending moment in the whole process of expanding excavation transited smoothly, and it fluctuated the most in Scheme.2; ②When the upper-left part is expanded, the vertical displacement and bending moment of the supporting structure of the three schemes all increase greatly. In the actual construction, the most unfavorable factor is that the settlement detection value of the vault increases rapidly after the expanding excavation of the upper-left part; ③The construction sequence adopts Scheme.3, the settlement value & convergence value becomes more and more stable about 7 after excavation, the accumulated settlement value is 17.146mm, and the accumulated convergence value is 14.512mm. The field data is close to the simulated data, no accidents occur in the construction process, and no abnormal phenomena are found in the monitoring and measurement process.
Back analysis of permeability coefficient of earth-rock dam based on EMD-RVM
Authors: Chen Yi
Published: August 2020

Since contemporary information-retrieval systems rely heavily on the content of titles and abstracts to identify relevant articles in literature searches, great care should be taken in constructing both. Since the permeability coefficient of the dam material of the earth-rock dam directly affects the seepage flow of the dam, in order to improve the accuracy of retrieving the permeability coefficient from the measured value of the seepage flow, the empirical mode decomposition method (EMD) is used to monitor the actual seepage flow of the weir. After decomposition, multiple sets of intrinsic modal functions (IMF) were generated to fit the relationship between water level and seepage flow; then the finite element software was used to calculate the seepage flow corresponding to the randomly distributed infiltration parameters at different water levels in order to the RVM model performs inverse analysis on the permeability coefficient. The training sample group is constructed by finite element calculation, the calculated seepage volume of the sample group is used as the input value, and the corresponding permeability coefficient is used as the output value. Based on EMD-RVM, a nonlinear mapping relationship between the permeability coefficient and seepage volume of each section of the face rockfill dam is established. Using the model inversion, the results show that the EMD-RVM model has high inversion accuracy and is significantly higher than the conventional RVM model and GA-BP model. The infiltration pressure of the face rockfill dam can be calculated from the inversion result of the permeability coefficient, and the error with the measured value is small, which verifies the feasibility of the model.
Examination of welded joint of titanium alloy used in oral surgery
Authors: Kónya J , Kulcsár K , Hargitai H
Published: August 2020

The additive manufacturing of customized Ti-6Al-4V (Grade 23) implants, which in the present research concerns the dental and maxillofacial surgical field, may require complex manufacturing technology due to their complexity and assembly. In practice, additively manufactured titanium implant elements are supplemented by threaded sleeves that allow disassembly. These turned elements made from Grade 5 material quality rolled preform are joined by laser micro-welding with Grade 1 material. This special process for implant production is still not widespread in current manufacturing practice, and there is no technical recommendation for the manufacturing parameters of these implants. The aim of our research is to explore the possibilities and limitations of additive process in the manufacture of custom-made implants and to provide guidelines for optimal manufacturing and welding parameters. In the initial phase of the research, preliminary experiments were conducted with the conventional and additive manufacturing of cylindrical test specimens and with the production of combined products by micro-welding. The specimens were subjected to tensile testing, the weld was examined by CT, and the fracture surfaces were studied by optical microscope and scanning electron microscope.
Enhancing the Firework Algorithm ecosystem for the reconstruction of the HTC function
Authors: Fried Z , Felde I , Szénási S
Published: August 2020

The heat transfer coefficients reconstruction could be solved using several ways and configurations. The Inverse Heat Transfer Problems (IHCP) collects all kind of algorithms which try to solve the Heat Transfer Problems. These algorithms try to calculate the heat transfer coefficients inversely. There is some solution for solving this numerical method, but the bio-inspired solutions are better here even though they have some limitations because of this is a kind of genetic one. Using the Fireworks Algorithm (FWA), it is possible to introduce new methods, and modify the original FWA controlling system and parameters in an easy to adapt to this problem. Extensions are suggested with the major limitation of the genetic methods which solved by the proposed one, and with the faster computation of the new modified method.
Development of high power femtosecond laser microstructures on automotive stainless steel
Authors: Tajti Ferenc , Berczeli Miklós
Published: August 2020

It is indispensable for the industry to introduce the most accurate manufacturing technologies. Therefore, laser beam machining centres have been gaining popularity in machining equipment over the last few years. We can perform quick and highly accurate machining with the latest generation of laser equipment which operates in femtosecond pulse mode. The purpose of this study is to find the best femtosecond laser surface machining technique on stainless steels by changing technological parameters. We have compiled a general table that lists the parameters, with variable values in bands and columns to select the most accurate surface treatment with minimal heat affected zone.
Optimization of material removal parameters by femtosecond laser pulses
Authors: Berczeli Miklós , Tajti Ferenc
Published: August 2020

Lasers are widely used and have become indispensable in many areas. Their application is very advantageous in many cases, the technology is very fast and high-precision machining can be achieved. Lasers are increasingly used in the automotive, aerospace, electronics, and medical industries. With this technology, we can perform almost any kind of material processing whether drilling, cutting, welding or even heat treatment. The laser can be well integrated into various machining systems and well automated. With the advancement of technology, we are capable of producing femtosecond pulsed lasers which machines are capable of high peak performance. Because of the high peak power and short pulses, other physical phenomena occur when the laser interacts with the material, so the method of material removal is different from longer laser impulses. Their application is expected to provide a much more controlled, more precise material removal, with very good surface quality, free of burrs and other dirt and deposits. One of the most important benefits expected from the use of technology is the minimal or no heat affected zone. In our research we are looking for a parameter that can achieve the most accurate material removal with a smaller heat affected zone.
The effects of the steel’s surface quality on the properties of anti-corrosion coatings
Authors: Herbath B. , Kovacs K.
Published: August 2020

The requirements of painted vehicle construction in terms of corrosion resistance apply not only to cars but also to heavy duty lorries, trucks and agricultural machinery. Phosphating is the most commonly used method for the pre-treatment before painting of ferrous metals in the vehicle manufacturing industry. The task of the phosphate layer between the metal surface and the paint is to protect the metal from corrosion under the paint film and promotes the adhesion of the paint film to the metal substrates. In this study the zinc phosphate conversion layer was deposited onto the steel surfaces from a bi-cationic (nickel-free) phosphating bath by dipping using identical technological parameters. The developed crystal structure and morphology was examined in terms of surface roughness and blasting quality of the metal. The surface quality of the metal was tested by digital light microscopy (LM), and the structure of phosphate coating was investigated by scanning electron microscopy (SEM).
Microstructure examination of additive manufactured 316L steel
Authors: Dávid Miklós KEMÉNY , Dávid PAMMER , Dorina KOVÁCS
Published: August 2020

The additive manufacturing (AM) is a new field in research. In our research, the samples were made by direct metal laser sintering (DMLS). During the production of 316L material, the piece was formed layer by layer, so the existing layer was re-heat treated when the new layer was formed. Due to the multiple heat treatment, the post-heat treatment of the product is necessary. Microstructure changes were investigated after two different heat treatments. The first was at 450 °C for 4.5 hours, and the second was at 1100 °C for one hour, followed by annealing in each case. The heat-treated sample at 450 °C showed no significant difference. In contrast, the sample heat-treated at 1100 °C the particles were better separated, and segregation in grain boundary was observed, which showed high phosphorus concentration.