bluuebunny/crossref_metadata_2025 huggingface dataset:
Empirical Analysis of R&D Investment, Industrial Structure Transformation and Development of High-tech Industry in Guangdong Province——Based on Time Series Data from 2003-2018
Authors: Zhong Jiayi , Tang Yan , Zhong Jiayi
Published: December 2019

The transition from high-speed growth to high-quality development is the basic strategy for China’s current economic development. The essence of high-quality development lies in releasing the vitality, innovation and competitiveness of the economy. The key lies in technological innovation and technology diffusion. This paper uses the relevant theories and methods of econometrics to conduct an empirical analysis on the relationship between the output value of high-tech industries and R&D investment, industrial structure transformation in Guangdong Province from 2003 to 2018. The results show: When the R&D expenditure (X1) of Guangdong Province changes by 1% in 2003-2018, the output value of high-tech industry (Y) changes by an average of 0.9981%. When the ratio of the output value of the second industry to the output value of the tertiary industry (X2) changes by 1 unit, the output value of the new technology industry (Y) changes by an average of 86.86%. At the same time, it also found some characteristics of the development of manufacturing and service industries in Guangdong Province, which provided a certain idea for Guangdong to cultivate new kinetic energy for economic development and promote high-quality development.
Comprehensive Energy Efficiency Assessment of Energy Internet Based on Entropy Weight Method
Authors: Guoi Lei , Wangl Linyu , Wang Yongli , Zhang Yuanyuan , Dong Huanran , Zhang Danyang
Published: December 2019

In recent years, with the depletion of fossil energy and the aggravation of environmental crisis, the contradiction between the development of human society and traditional energy institutions has become increasingly prominent. The worldwide demand for energy supply and structural transformation has increased, and the energy industry has spawned many development directions. This paper analyses the boundaries of comprehensive energy efficiency evaluation oriented to energy internet, constructs the index system of comprehensive energy efficiency evaluation, expounds the calculation methods of each index, gives the evaluation benchmarks, and establishes a comprehensive energy efficiency evaluation method with energy analysis as the core. Finally, an example is given to analyze the evaluation method based on the actual data to realize the effective evaluation of comprehensive energy efficiency, and to verify the integrity of the index system and the effectiveness of the evaluation method.
Numerical simulation of secondary sedimentation tank based on population balance model
Authors: Yang Ni , Wen Yue
Published: December 2019

A technical method of grid flocculation wells is proposed to control the effects of heterogeneous flow on the flow regime and the removal efficiency of suspended solids in the secondary sedimentation tank. The flocculation and sedimentation of activated sludge in sedimentation tanks were simulated by a combination of population balance model (PBM) and computational fluid dynamics. Compared with the prototype of the flocculation well, the grid split the vortex under inertia and the turbulence of the grid, which increased water viscosity, improved the energy dissipation of the flocculation well by more than 40%. The energy consumed by the viscous action provided the power for flocculation of the activated sludge, and reduced the volume fraction of particles with a particle size of less than 98μm by over 50%. After the addition of No. 2.5 (grid interval is 25 mm) and No. 3.5 (grid interval is 35 mm) grids, the concentration of effluent suspended solids was reduced by 29.3% and 69.4% respectively, compared with the prototype. The average suspended solids concentration of the No. 3.5 model of the actual optimization was 9.2 mg L-1, which was similar to the simulation results, indicating the effectiveness of the optimization method.
Process Control Analysis of Modern Chemical Instruments and Chemical Automation
Authors: Cao Xiaofeng , Zou Shuhui , Wang Dandan
Published: December 2019

This paper analyzes the relevant content of modern industrial automation, combines the meaning of modern industrial production and the types of chemical instruments, and studies the modern process instrument and chemical automation in the process of programming, calculation, memory, complex function and fault function. In this paper, the control measures aim to improve the stability of the use of modern industrial instruments and promote the rapid development of the industry economy.
Optimization of Removal of Lignin from Corn Stover by Urea
Authors: Wang Shuang , Li Hongxia , Wang Wen , Zhang Junjie , Hongyu Li
Published: December 2019

Corn stover in rich source was taken as the research object. The pre-treatment process of corn stover by urea was proposed. The effects of urea amount, temperature, time and the ratio of solid-liquid on the degradation of lignin were investigated. The results showed that urea had a definite degradation effect on lignin and hemicellulose in corn stover. The optimum experimental conditions were as follows: 8g corn stover, 0.8g urea and 80ml water were added in triangle bottle. The degradation was carried out for 4 h shocked with 170 r/min speed in a thermostatic water bath oscillator at 60°C temperature. The degradation rate of lignin was about 40%. The regent of urea was environment friendly and the method was prospect for practical application.
Discussion and Consideration on Key Issues of Coal Power Development in China
Authors: Yan Xiaoqing , Yang Jie , Huang Xinting
Published: December 2019

Coal power generation capacity has exceeded 1 billion kilowatts in China currently. As the ballast stone and stabilizer in the field of energy and power, coal power attracted more and more considerations today. A reasonable and scientific planning is important to power system security and efficiency, especially the coal power development path. The full-cycle coal power cost model used in the power expanding planning is proposed in this paper, in order to optimize the power capacity in the future. Based on this method, the peak capacity of coal power is evaluated firstly. Then the peak awareness and bottom line thinking principle are put forward based on the analysis above. Finally, the external cost internalization and flexibility transformation of coal power are discussed, which are the main issues in the coal power industry nowadays.
Perspective of China’s energy strategy from world trend based on a combined Fuzzy-Logarithmic and Fuzzy-Topsis method
Authors: Yan Xiaoqing , Zheng Kuan , Yang Jie , Huang Xinting
Published: December 2019

The downward pressure of the world economy is increasing, with a rising populism tends and geopolitics turbulence. The emerging economy led by China turns into the main body of energy market increment. The global energy supply and demand pattern is undergoing profound changes, which makes energy strategy more and more important. Based on the evolution practice analysis of energy strategy in typical countries proposed by our team, several important paths of energy strategy in China are identified firstly. Meanwhile, a combined Fuzzy-Logarithmic and Fuzzy-Topsis method is proposed in this paper in order to rank the key points of energy strategy, especially considering the energy strategy issues are always complex and difficult to quantify. Finally, seven strategy paths are evaluated by priority, which are demanded-oriented reform, mitigating institutional mechanisms contradictions, energy technology breakthrough, global energy governance, energy enterprise synthesis strength improvement, energy finance system construction and integrated energy system construction. It is expected that the advice proposed in this paper is beneficial to our energy industry.
Study on Adoption of Building Information Modelling in Reducing Construction Waste in Malaysia
Authors: Vasudevan Gunalaan
Published: December 2019

This paper is study of the adoption of Building Information Modelling (BIM)be adopted in finding a salient solution to the long-going predicament of management and minimisation of construction wastes in Malaysia. In doing so, the focus has been on the identification of ways BIM technologies could be introduced, the proclamation of its advantages in comparison to conventional methods and systems as well as the challenges the Malaysian construction industry and its players faced in pushing forward a formalised and standardised implementation of BIM in significantly reducing the amounts of construction wastes generated by the industry. The research, in answering the aim and objectives of the study was conducted by reviewing past, relevant literatures as well as through the distribution of questionnaire survey to industry players. The questionnaire was distributed to 135 industry players located in the Klang Valley and 91 out of 135 distributed questionnaires were returned and thus, perused in conducting the research analyses. Microsoft Excel and Statistical Package Social Science (SPSS) software were utilised in analysing and presenting the collected data. The analyses of data revealed that the adoption of BIM in Malaysia is relatively stagnant and happens at a low rate. Poor waste management and minimisation plans, poor awareness on the importance of such plans coupled with lack of demand from clients are regarded as the main reasons as to why this waste reduction has become a mare’s nest. In response to that, effective planning and scheduling of activities, effortless synchronisation of project design, site and materials together with detection of errors, discrepancies and clashes were chosen as the most important BIM-based benefits that could tackle this issue down once a proper implementation is set in place.
Research on Strapdown Inertial Navigation and Laser Doppler Combination Navigating Algorithm
Authors: Li Yongqiang
Published: December 2019

In the current strapdown inertial navigation system, there are errors in the calculation model set by the airborne computer and the accuracy of related equipment, and the errors accumulate over time, which will lead to lower navigation accuracy and larger speed deviation. In order to solve the above problems, a new integrated navigation algorithm is proposed in this paper, which takes strapdown inertial navigation system as the main body and calculates the velocity and attitude of the aircraft. Laser Doppler assisted velocity measurement system is used as the auxiliary navigation system to correct and eliminate the velocity error of strapdown inertial navigation system. At the same time, Kalman filter technology is used to modify the velocity data of integrated navigation system. The simulation results show that the integrated navigation algorithm can reduce the speed error and improve the navigation accuracy, which verifies the effectiveness and feasibility of the integrated navigation algorithm.
Bit Optimization for Che 47 in Carboniferous Stratum
Authors: Sun Xiaorui , Wu Baichuan , Ye Cheng , Han Fuwei , Zhang Nan
Published: December 2019

The Carboniferous in the Well 47 area is dense and hard, with strong abrasiveness and low mechanical drilling speed. According to the correlation between the logging and the completed drilling data in the Carboniferous system, the lithology distribution of the strata in the Che 47 well area was determined, and the bit selection was carried out in combination with the bit wear and broken teeth. At the same time, the optimized drill bit was applied on site. The field data shown that the lithology of the Carboniferous strata in the Well 47 was complex. The upper strata are soft and hard, and the lithology of the lower stratum was dense and hard. The optimized drill bit could increase the drilling speed of the whole well by 4.63 times and the average drill bit increase by 3.84. It achieved the purpose of drilling speed increase, and achieved good application results.
The surface tension effect on flexoelectric energy harvesting based on isogeometric analysis
Authors: Li Kaichun , Chengbin Du
Published: December 2019

Surface tension can cause important deformations in fluids but is usually overlooked in solids. Recent work has shown that surface tension can become significant in the deformations of soft solids. Here, we present an isogeometric-analysis-based numerical example of cantilever beams under a point load for modeling the influences of surface tension on the flexoelectric energy harvesting system. The interface of the fluid/solid is implicitly represented using level set method. These results show that the maximum electric potential decreases when the number of liquid inclusions increases. However, the electric potential near the solid/liquid interface increases when considering the surface tension effect.
Fracture failure analysis of high-speed shaft
Authors: Ren Facai , Wu Xinghua , Tang Xiaoying
Published: December 2019

The fracture failure causes of a high-speed shaft in a hoisting gearbox were analyzed based on the optical microscope and scanning electron microscope analysis. The results show that the fracture failure cause of the high-speed shaft is fatigue. Surface defects, such as machining tool marks and folded cracks, are the source of fatigue fracture under stress.
Research and Application of Self-tuning PID Regulator
Authors: Wang Xiaoxia
Published: December 2019

In industrial production, the application of PID regulators is becoming more widespread. Among them, the self-tuning PID regulator is used by many products in the production process because of its unique advantages. The self-tuning PID regulator refers to a controller that includes a parameter self-tuning of a proportional control module, an integral control module, and a differential control module. The proportional control unit is used to generate a stable error, the integral control unit is used to eliminate the error signal, and the differential control unit is used to handle the effects of the hysteresis component. The parameters of the PID regulator for parameter setting mainly include the Z2N method, the 4:1 attenuation method and the critical proportional method. The steps of PID parameter tuning include adjusting the proportional gain, integral time constant, differential time constant, and parameter trimming. It is necessary to adjust the parameters from the aspects of speed, efficiency, stability, etc., so that the parameters complement each other and continuously improve the overall performance of the system.
Research on dynamic deformation monitoring of viaduct based on digital camera
Authors: Zhipeng Liu , Tonglong Zhao , Yongbao Zhao , Chengxin Yu
Published: December 2019

In order to realize dynamic deformation monitoring of viaduct and provide data support for safe operation of viaduct, this paper studies the application of digital camera in dynamic deformation monitoring of viaduct. Firstly, the digital camera is corrected to eliminate the aberration, then the corrected digital camera is used to collect data, and then the time baseline parallax method is used to calculate the data, and finally the operation status of the viaduct is obtained through the analysis of the data. The experiment shows that the viaduct is in good operation and use digital camera as monitoring equipment, the dynamic deformation monitoring of viaduct is realized, which is of great significance to the safe operation of viaduct.
The method of prediction of roof collapse hidden trouble in the roadway of No.2 in Anjialing
Authors: Pengde Sang
Published: December 2019

The thickness and strength of strata composing roof stratum will change a lot because of the change of coal forming environments and long time geological evolution. Only knowing these changes exactly, we can get the right design and prevent roof collapse. We can get the thickness, relative position and location of cracks and roof separation of strata with the changing of length of roadway at any time, and design the roof of roadway dynamically according to the lithology and combination changes of roof. In accordance with these, we can ensure not only the economic, but also safety in production.
Evaluation on functional Importance of Regional Landscape Elements of Highway
Authors: Wang Yuwen , Pan Shaobing , Wei Xianwei , Jiang Haifeng , Liu Zhiqiang , Yuan Minmin
Published: December 2019

Highway regional landscape elements are an important part of highway landscape, which can play an attractive exploration of the unique landscape effect. The infiltration of regional landscape elements of expressway can make drivers and tourists experience the local conditions and customs in the region through which they pass, and also enable the staff of the Department to understand the local economic characteristics and bring business opportunities to the economic development of the region. This paper uses analytic hierarchy process to rank the importance of five regional factors. The results show that representativeness and influence are the two most important factors.
Neutral Point Potential Balancing Control for NPC Three-Level Inverter Based on Space Vector Modulation
Authors: Hang Xia , Jie Zhang , HongXi Yang
Published: December 2019

This paper introduced the topology and space vector modulation strategy of NPC three-level inverter. A method of judging the sector where the reference vector located is proposed. The cause of neutral-point potential unbalancing is analyzed. In order to solve neutral-point voltage balancing problem, a control method fully utilizing redundant voltage vectors is proposed. Simulation results verified the correctness and effectiveness of the proposed method.
γ-Fe2O3 as a novel Electron Transporting Material for Planar Heterojunction Perovskite Solar Cells by simple Room-Temperature Solution method
Authors: Guo Ying , He Hongcai
Published: December 2019

α-Fe2O3 has been demonstrated to be a promising electron transporting material (ETL) for fabricating efficient perovskite solar cells (PSCs) with good stability under ultraviolet light compared to the commonly used TiO2. However, α-Fe2O3 films need to be processed over 500 °C, which is a serious impediment to fabricate devices on the flexible substrates. Herein, γ-Fe2O3, which could be deposited onto the substrates under room temperature, would be an alternative magnetic ETL with a reasonable performance. We report that pure and fine nano-sized γ-Fe2O3 particles can be synthesized below 200 °C and the corresponding compact layers have been fabricated by a simple room-temperature solution process. The methylammonium lead iodide (MAPbI3) PSCs based on γ-Fe2O3 show a power conversion efficiency of 12.86% with a short circuit current (Jsc) of 21.79 mA/cm2, an open circuit photovoltage (Voc) of 0.93 V and a fill factor (FF) of 63.3%. These results indicate a possible direction for preparing flexible perovskite solar cells.
Performance analysis on electromagnet assembly of elevator brake
Authors: Ren Facai , Wu Xinghua , Tang Xiaoying
Published: December 2019

The performance of electromagnet assembly of a elevator brake was analyzed based on the microhardness test, microscrostructure and chemical composition analysis. The results show that the microstructures of inner wall are mainly ferrite and large flake pearlite with relatively high carbon content and the microstructures of the plunger are mainly ferrite with very low carbon and a small amount of tertiary cementite.
Study on properties of citric acid to magnesium oxysulfide cement
Authors: Zong Jingping , Wu Chengyou , Luo Kejia , Zhou Jiaqi , Miao Meng
Published: December 2019

Magnesium oxysulfide cement (MOS) is an emerging building material. The application of MOS in practical engineering is affected by the low mechanical properties, which can now be modified by some admixtures. In this paper, the mechanical properties and hydration heat release of citric acid (CA)-modified MOS were studied, and the phase composition and microstructure of hydration products were analyzed by SEM and XRD. The results show that the addition of CA modified MOS can reduce MgO direct hydration of Mg(OH)2, promote the formation of a large number of needle-shaped 5Mg(OH)2 ·MgSO4·7H2O (5·1·7) phase crystals, and the compressive strength is greatly improved. When the CA dosage is 0.5%, the mechanics of MOS Best performance. The clotting time of the MOS modified with CA is slightly prolonged.
Research of The Calculation Method for round-end concrete-filled steel tube under the eccentric load
Authors: Wang Erlei , Xie Jianxiong
Published: December 2019

Round-end concrete-filled steel tube (RCFST) columns have been applied to bridge structures. There is not the formula of RCFST under the eccentric load in code. Based on the equation of axial force and moment, the basic correlation equations of the strength and stability capacity of concrete-filled steel tube under the eccentric load are obtained through theoretical derivation. Formula results compared with finite element simulation results show results are in good agreement.
Performance simulation analysis and comparison of different shearing mild steel dampers
Authors: Tian Zhen , Sun Jianyun , Zhao Yongxi , Luo Ye , Liang Yanfang , Li Wei , Zhai Minghui , Li Jinli , Li Yuting , He Jiangtao
Published: December 2019

Mild steel dampers are widely used in the field of engineering structures energy dissipation and seismic reduction because of its advantages such as easy manufacturing, low cost and easy installation and replacement. In order to analyse and compare the performance of the different mild steel dampers, eight different shape shearing mild steel dampers are designed in this paper, and the simulation analysis is conducted using Finite Element Method (FEM) of ABAQUS/Standard. And the bearing capacity, initial stiffness and energy dissipation capacity of the different shearing mild stell dampers are compared according to the simulation results. The analysis and comparison results show that the performance of shearing mild steel damper is greatly affected by its shape. Therefore, the different shearing mild steel dampers should be selected reasonably according to the engineering requirements.
Comparison of FEA for Different Type Element Models of Open Thin-Walled Member
Authors: Xie Yonglan , Qi Hu , Lin Bing , Zhang Qingyu
Published: December 2019

Open thin-walled beam is widely used in civil engineering. The open-walled section model is significantly different from closed section model because the torsional stiffness is small. In order to select an appropriate analytical model for the open-walled section member, three different type element models (beam element model, shell element model and solid element model) for open-walled section members are adopted in ABAQUS/Standard and the low-frequency cyclic loading is used in the analysis process in this paper. The hysteretic curves and skeleton curves of the different element model are obtained using above method, and the bearing capacity, stiffness and the computation time are compared. The analysis results show that the results of three type element models are in good agreement, and the computational efficiency of the three type element models varies significant differences. Hence, it can be concluded that the accuracy of computation results can be guaranteed using those three type element models, and the beam element model has the highest computational efficiency.
Study on Technology of Hydraulic Cutting Seam of Ultra-high Pressure with Strip Predrilling
Authors: Wang Xiaopeng
Published: December 2019

It is well known that the most fundamental means of gas management is gas extraction, the most difficult problem of gas extraction is low permeability of coal seam. Hydraulic cutting seam technology in recent years in uncovering coal, eliminate outburst danger has made great progress, therefore, to carry out the hydraulic cutting seam technology in the coal seam gas extraction from aspects of strengthening research is of great significance. Hydraulic slotting make around borehole in the coal gas by one-way two-way radial flow into radial and axial flow, based on the perturbation of the slot width, average single-hole gas from coal extraction from scalar, extraction radius of investigation, analysis of the hydraulic cutting seam technology and drilling data of extraction technology, the average single-hole extraction is obtained by 3 times.
Synthesis and Photophysical Properties of Aromatic Fused Ring Small Molecule Acceptor Materials Based on Two-dimensional indacenodithiazole for Organic Solar Cells
Authors: Yuan Gui-Zhou , Chang Zheng-Feng , Wang Jin-Liang
Published: December 2019

A new two-dimensional conjugated core unit 2DIDTz was synthesized based on indacenodithiazole with thiophene side chain. Then, a linear two-dimensional conjugated small molecule acceptor material, namely IDTzIID, based on 2DIDTz as core unit and (E)-1,1’-bis(2-ethylhexyl)-[3,3’-biindolinylidene]-2,2’-dione (IID) as end-groups was designed and synthesized through Still coupling reaction. There is a strong intermolecular charge transfer (ICT) between the IID and 2DIDTz. The structure and purity of the IDTzIID target compound was examined by 1H NMR. The IDTzIID showed good solvent properties in organic solvents. The IDTzIID showed wide and broad absorption with a band gap of 1.63 eV which can be matched with polymer donor materials for advanced organic solar cells.
Determination of continuous miner matching property for different geological conditions
Authors: Zhang Zhendong
Published: December 2019

In order to find a common method to match different geological conditions for continuous miner, fuzzy synthetic evaluation method is used to find the influence factors of continuous miner matching attribute. A total of twenty-one impact factors were found, and the structures and membership functions of these impact factors were established. The judgment matrix is constructed to determine the weight of each influencing factor based on statistical data, research results, and expert experience. Comprehensive evaluation model is established based on multi-level and multi-factor, then the integrated assessment value for different geological conditions are calculated, it is used to judge how well the continuous miner matches the geological conditions. This method is used in four field examples, compared with experts evaluation results, the two results are basically the same, so this theoretical approach is effective.
Fermentation of coffee beans with inoculation of bacillus subtilis and its impact on coffee sensory quality
Authors: Muzaifa M , Hasni D , Febriani  , Patria A , Abubakar A
Published: December 2019

The aim of this research was to study the coffee fermentation with inoculation of Bacillus subtilis isolated from civet (Paradoxorus hermaphroditus) as starter culture. The quality of coffee was evaluated by sensory quality (cup test). Two treatments were carried out: control/coffee non-inoculated starter culture (treatment F) and coffee inoculated with a Bacillus subtilis starter culture (treatment G). The fermentations were conducted for 48 h in triplicate. A inoculation of Bacillus subtilis as a starter culture cause a decrease in pH and increase in total titratable acidity of coffee fermentation solution. A panel of five trained coffee testers (Q-grader from Gayo Cupper’s Team) evaluated the samples. Ten sensorial attributes analyzed were fragrance/aroma, flavor, aftertaste, acidity, body, uniformity, balance, sweetness, cleanliness and overall. The result showed that the use of Bacillus subtilis starter culture improved quality of coffee fermentation. The aroma, flavour, aftertaste, body, balance and overall were increased. The cupping score total of coffee increased from 82.83 to 84.33. Metabolites analysis should be further investigated to confirm this result, especially organic acids compound.
Ruellia tuberosa L Anthocyanin extract as a pH sensitive substance
Authors: Safitri E , Afifah N , Khairi  , Lelifajri  , Nazaruddin  , Susilawati  , Sani N D
Published: December 2019

Anthocyanin from the flower Ruelila tuberosa L was successfully extracted by maceration using methanol. The total extract obtained was 19.22% with a concentration of 1.503 mg/L correspondingly. Retention time was analyzed using Thin Layer Chromatography and an Rf value of 0.43 was achieved. The analytical determination of functional groups was conducted using FTIR. The sensitivity of anthocyanin towards phosphate buffer pH is 0.222 at the range of pH 6 - 8 with R2 = 0.996 at maximum wavelength of 635 nm. On the other hand, its sensitivity towards citrate buffer is 0.022 at pH range 6 - 8 with a linearity of R2 = 0.999 at 625 nm maximum wavelength. The anthocyanin showed good in sensitivity and dynamic range in 0.1 M Phosphate buffer solution.
Indigenous knowledge of postnatal mother care using plants by acehnese
Authors: Zumaidar  , Saudah  , Rasnovi S , Harnelly E
Published: December 2019

Acehnese is one of ethnic of seven others (Gayo, Alas, Aneuk Jamee, Kluet, Singkil, Tamiang, Simeulu) who are in Aceh Province. Indigenous knowledge is a cultural heritage that can function as a conservation effort on biological resources. Postnatal mother care is one of the cultures of the Acehnese people. The aim of this research is to obtain information about postnatal mother care by the Acehnese. The method was Participatory Rural Appraisal (PRA) and observation techniques by purposive respondents (midwives (makblien), postnatal mothers, and mothers aged ⩾45 y). The data werecollected in six districts of Aceh Province (Banda Aceh, Aceh Besar, Pidie, Pidie Jaya, Bireun, and Aceh Jaya). The results showed that there were three to seven treatments in postnatal mother care, including body massage, herbal remedies for stomach appliances, hot stone (tőetbatee), fog treatment (salee), herb body scrub (param), bathing herb, and herb pills. The herb pillswere the most popular treatment and used many plants than the others. Otherwise, fog treatment wasnot popular in postnatal mother care. Aceh Besar district could be predicted to conserve local knowledge and medicinal plant than the others.
Surface water quality analysis and monitoring in Aceh Jaya district, Indonesia
Authors: Saiful  , Gani A , Ulim A
Published: December 2019

Nowadays, changes in the quality of surface water are becoming a serious problem to support clean water for the community. Aceh Jaya district as abundant natural resources that need to be processed and utilized, such as gold mining, agriculture, palm oil mills, and others. These activities can provide economic added value and also decrease the quality of the environment, such as changes in the quality of surface water. Surface water quality analysis has been studied to determine the different ion concentrations in the waters on the river Kr. Teunom and the river Kr. Ligan of Aceh Jaya regency. The results of the analysis of the water quality of the river show were physically the water quality of the river Kr. Teunom and Kr. Ligands are still following quality standards. Based on chemical parameters, the water quality of the river Kr. Teunom and Kr. Ligands, in general, are found in a low level of heavy metals such as Hg, Mn, Pb, As, Cd, and Cr in water. Cyanide levels in all samples of the river water are following the quality standard PPRI No. 82 of 2001 Class I and regulation of the Minister of Health Number: 492/Menkes/Per/IV/2010 concerning drinking water quality requirements. The presence of mercury ions in all river water must be a concern because mercury can accumulate in the tissues of aquatic organisms for a long time.
Thermal comfort and thermal adaptive behaviours in office buildings: A case study in Chongqing, China
Authors: Liu Jing , Wang Juan
Published: December 2019

A field study on adaptive behaviours for thermal comfort was performed in office building in Chongqing, China, from June to August, in which a total of 341 valid datasets were collected for further analysis. The results showed that although the separated air-conditioners were in use during working hours, the mean indoor air temperature during summer time was 27.78 °C, which was not with the summer thermal comfort zones specified in ASHRAE 55 standard. However, 93.5% of subjects regarded surrounding thermal environment was comfortable as a result of actively utilizing adaptive actions comprising technical (e.g. turning on air-conditioners, ceiling fan, etc.) and personal (e.g. having cold drinks, adding clothes, etc.) aspects. Air-conditioners was the most popular environmental control in summer. People would like to operate several environmental strategies simultaneously to alleviate thermal discomfort. The clothing insulation values of occupants drops to 0.4clo from 0.6clo in response to the indoor air temperature changing from 22°C to 32°C. The findings in this investigation are benefit for understanding of the interaction between occupants and ambient thermal environment and providing guidance on building energy efficiency.
Application of Field Survey and Graphic Language in Cultural Relics Building——Taking Liuzi Temple as an Example
Authors: Tong Shuyuan , Zhu Yafeng , Li Zhe
Published: December 2019

This article is a comprehensive and in-depth study of the shape and cultural connotation of cultural relics to achieve the protection and utilization of cultural relics. Using modern measurement techniques and advanced equipment, such as laser range finder and electronic theodolite, traditional measurement methods such as leveling surveying and detailing surveying are used for Liuzi Temple to obtain a large amount of actual data. At the same time, the stone carvings, textures and murals of the Liuzi Temple were investigated through close-range photography. In addition, through computer-aided data processing, it is transformed into a graphical form to deeply analyze the Liuzi Temple, providing a reference for the basic data mapping of cultural relics.
The case study of carbon emission in building construction process
Authors: Wu Wenling , Sun Pengcheng , Zhou Hui
Published: December 2019

Construction management in China has embraced a new practice encompassing the evaluation criteria of green construction. Thus, carbon dioxide (CO2) emissions produced during the construction period should not be overlooked anymore. A quota based CO2 emission calculation method was established. A commercial building and a school building, as two cases were studied. It’s shown that the unit CO2 emission for the two buildings’ construction process are 11.5 kgCO2/m2, and 11.6 kgCO2/m2, respectively. The CO2 emissions for earthwork, foundation work, masonry, concrete work, reinforcement work, formwork, decoration work and measurement work during construction were calculated. The results showed that foundation work and measurement work emitted the most CO2, contributing more than 50% CO2 emission, following by reinforcement work and concrete work. Formwork and masonry work emitted very little CO2. The CO2 emission of different machines were also studied, and the results show that the top 10 machines can take up about 90% of the total CO2 emission. Tower crane, electric welding machine, drilling rig, pile driver, truck, excavator and concrete pump are some of the most CO2 emission machines. These results could help construction managers identify low carbon construction methods and machines in order to maximize the carbon reduction opportunity during the construction stage.
Experimental study on consolidation characteristics of collapsing soil under different dry densities
Authors: Wang Jiani , Han Ruting , Zhang Xiaoming
Published: December 2019

The occurrence and development of collapsed hills in southern China are significantly affected by soil properties and consolidation characteristics. Three different dry densities were set up in the study. The four-layer soil was subjected to indoor one-dimensional consolidation test, in order to study the consolidation characteristics. The results show that the soil consolidation properties of different layers are different under different dry densities. Under the same load pressure, the four-layer soil’s pore ratio decrease with the increase of dry density; no matter how the dry density changes, the topsoil has a minimum pore ratio as the load increases. The maximum relative deformation rate occurs at the load pressure is 200 Kpa, the overall trend is the inverted “v” trend; the trend of compression coefficient of every treated soil sample is the same as the compression index, and the maximum value is the topsoil when the dry density is 1.40g/cm3; 1.40 g/cm3 of topsoil is high compressive soil, most of the rest are medium and low compressive soil. In this paper, from the consolidation characteristics of each soil layers under different dry densities reveal the mechanism of collapsing, which provides scientific basis for the prevention and control of collapse.
Analysis of settlement of existing buildings caused by unreasonable design of foundation
Authors: Tong Jianxing , Sun Xunhai , Jia Ning , Dang Wenyuan , Li Zhao
Published: December 2019

As for the settlement accidents of existing buildings, people pay more attention to the construction quality than the rationality of foundation design. This paper analyzes and discusses the problem of excessive settlement of existing buildings caused by unreasonable design based on three typical engineering cases. The conclusion is that as for the upper filled soil and lower soft soil foundation, the heavy tamping method is not suitable without auxiliary measures if the foundation settlement is strictly controlled; cement-soil mixing pile method is not suitable for high-rise buildings based on soft soil foundation; the foundation design should be based on deformation control when high compressibility soil layer exists, the pile body should penetrate the main compression deformation layer, and the pile end should fall on the good bearing stratum when using pile foundation or rigid pile composite foundation.
Construction Time-Cost Optimization of River Dredging Project in Cold Region Based on NSGA-II Algorithm
Authors: Feng Xiaohua
Published: December 2019

The construction of water conservancy projects is increasingly restricted by non-technical factors such as climate, environment and society, so it is particularly important to optimize it to improve the benefits of construction enterprises. Taking a river dredging project in cold region as an example, this paper uses NSGA-II algorithm to carry out multi-objective optimization of the construction time-cost, and uses MATLAB software to compile the construction optimization program of dredging project. Finally, the optimal combination of construction time and cost is obtained. The results show that the optimization results are in line with the actual situation of the project and save about 10% of the investment for the project. The method in this paper can provide useful reference for the optimization control of the construction progress of the actual project.
Analysis of the influence of subway entrance excavation on tunnel and adjacent buildings
Authors: Shi Junjie , Liu Junyan , Wu Yongzhen , Liu Yong
Published: December 2019

With the rapid development of urban subway transit construction, the construction of subway entrance and exit accessory structure in densely populated areas and near buildings is gradually increasing. Based on the open-cut foundation pit project at the entrance and exit of subway R3 line in Jinan city, this paper adopted MADIS GTS/NX 3D finite element analysis software to conduct finite element analysis on the connection tunnel and adjacent buildings by subway entrance and exit foundation pit excavation, and analyzed the displacement change trend of foundation pit excavation on the underground tunnel and building. The results show that the horizontal displacement of the connection area between the tunnel and the foundation pit is small, while the vertical displacement of the tunnel is relatively large, with a maximum value of 3.58mm. The settlement at the corner of the building adjacent to the foundation pit is relatively large, and the maximum settlement value is 3.03mm. It is in good agreement with the measured data and meets the requirement of deformation control. This study provides reference for the foundation pit engineering of subway entrance and exit of similar adjacent buildings.
Analysis of drivers’ visual characteristics in expressway tunnels with different radii
Authors: Pan Binghong , Wang Ye
Published: December 2019

The aim of this study is to analyse drivers’ visual characteristics in expressway tunnels with different radii by driving simulation experiments. This paper used forum driving simulation device, eye-tracker (SMI ETG™) and UC-win/Road to establish tunnel models with different radii for drivers’ visual characteristics analysis. Critical parameters indicating visual characteristics in the process of driving were sufficiently analysed and discussed. The results showed that there was an indispensable relationship between tunnel radius and eye movement.
Analysis of the Development and Trend of China’s Prefabricated Buildings
Authors: Lin Xiong , Jie Shen
Published: December 2019

This paper analyzes the policy and scale of China’s prefabricated buildings, expounds the current project management model EPC of prefabricated buildings, and further analyzes the changes in job requirements and cost trends.
Static Analysis of Factory Structures in the Reactor Device Area in a Nuclear Power Plant
Authors: Shao Qingwu , Fan Yibo , Qi Xiaohai , Bai Yanqiang
Published: December 2019

To inspect the static response of the factory structures in reactor device area in a nuclear power plant in design and construction stage, a numeral model of the structures is set and the effect of different combinations of dead load, live load, wind load, seismic action and temperature effect are considered. It is considered that the combination of dead load, live load and seismic action has the control action and the spallation target factory is the most unfavorable part.
Overall Tensioning Construction Technology of Main Beam of PC Plate Stiffened Beam Suspension Bridge
Authors: Yang Minghu , Liu Yuancai , Liu Yang
Published: December 2019

In the construction of the main beam of the PC plate type stiffening beam suspension bridge, the problem of tensioning construction of super-long prestressed steel bundles, combined with the Moon Bay Bridge with the main span of 465m, introduces the whole process of prestressed steel beam piercing and tensioning of the main beam. And the problems existing in the tension construction were analyzed. The construction of the Moon Bay Bridge was successfully completed, and its construction method can provide reference for similar bridge construction, which has certain reference significance.
Effect of Joint stiffness on Elastoplastic behavior of Cold-formed thin-walled Steel frames
Authors: Zhang Qi , Cheng Zhihui
Published: December 2019

In this paper, the first-order elastic analysis and second-order elastic analysis of cold-formed thin-wall steel frame (shelf) in practical engineering are carried out by using ANSYS and SAP2000 modeling analysis software, and the influence of semi-rigidity and second-order effect of joints on its overall performance is analyzed. At the same time, on this basis, the static elastic-plastic analysis of the shelf is carried out, and through the comparative analysis of the structural influence coefficient and displacement magnification coefficient of the shelf, the seismic performance of three kinds of beam-column connections (rigid connection, semi-rigid connection, hinged joint) is evaluated. And the structural influence coefficient of the shelf is put forward innovatively.
Set Pair Analysis based on Similar Forecast model of Civil car ownership
Authors: Wei Sun , Renteng Yuan , Shuaijie Su , Zhongyu Wang
Published: December 2019

It shows the important meaning that the accurate prediction of civil car ownership. The most important factor of civil car ownership are gotten from set pair analysis and correlation coefficient. Set pair analysis method can be used to quantificationally compute the similarity between main physics vectors from the view of identical, different and opposite sides. According to the weighted average of relative membership degree, obtain the set pair analysis based on similarity forecast model of civil car ownership, named SPA-SF. The forecast result of civil car ownership of 2015-2017 show that SPA-SF has certain application value in the prediction of civil car ownership.
Numerical Simulation and Experimental Study on the Anti-explosion Characteristics of Cavity Structure
Authors: Wei Liu
Published: December 2019

In order to study the anti-explosion effect of 500*500*200mm (length*width*height) cavity, the corresponding numerical simulation was carried out. It was found that the explosion suppression cavity has a good inhibitory effect on the explosion flame. The simulation results were verified by a field comparison test between the cavity and the straight pipe. It was found that the P1-P2 shock wave peak overpressure suppression rate was -8.11% in the straight pipe, and the F1-F2 flame suppression rate was -25.87%. After the cavity is coupled, the peak overpressure suppression rate of the shock wave becomes 17.12%, and the flame suppression rate becomes 40.85%. Compared with the straight pipe, the shock wave overpressure suppression rate of the cavity is increased by 25.23%, and the flame suppression rate is increased by 66.72%. Through numerical simulation and corresponding experiments, it is found that the cavity of 500*500*200mm (length*width*height) has better suppression effect on gas explosion. And the cavity wave elimination is a structural explosion suppression method, which can effectively suppress the gas explosion and its secondary explosion disaster.
Analysis of the penetration mechanism of CPTU based on large deformation finite element
Authors: Hao Hongchao , Yang Lingqiang
Published: December 2019

The Piezocone Penetration Test (CPTU) is a new in-situ testing technology developed in the 1980s. Compared with the traditional Cone Penetration Test (CPT), it has the advantages of high precision, large amount of data, good stability and wide application. Because of the short history of pore pressure static penetration (CPTU) technology, the CPTU develops slowly in China. By the large deformation, finite element simulation method is used to numerically simulate the CPTU penetration process in ABAQUS software; and the distribution and variation characteristics of soil stress, strain and pore pressure field at different penetration depths are studied. The results show that during the penetration of the cone, there is a stress concentration zone around the cone. The resistance of the cone is mainly the resistance below the cone tip. When the penetration is shallow, the soil is disturbed with the penetration. As the depth increases, the disturbance becomes smaller; according to the variation of the pore water pressure, the water permeable element can be placed at the junction of the conical head and the conical body.
Comparative analysis of vehicle-bridge coupling for different bridge numerical models
Authors: Mao Wangtao , Li Tao , Wang Tao , Zhang Lipeng , Liu Xiao
Published: December 2019

Taking a simple supported T-beam with a span of 30m as an example, firstly, three different finite element models, namely, grillage, shell-beam and solid are established. Secondly, combined with field tests, the above three finite element models are modified by finite element model updating method. Thirdly, based on the finite element software ANSYS, parametric programming and transient analysis function are used to realize vehicle-bridge coupling analysis. Finally, the displacement and stress time histories of the three models under moving loads are calculated and compared with the measured values. The results show that the displacement and stress histories of the solid model are in the highest agreement with the measured values, followed by the shell-beam model. It provides a way of modelling and analysing for vehicle-bridge coupling numerical analysis.