bluuebunny/crossref_metadata_2025 huggingface dataset:
Profile of science education problems in west sumatera and its surroundings
Authors: Lufri  , Yogica Relsas
Published: November 2019

The profile of the science education problem in West Sumatera and surroundings is reported in this paper. The purpose of this work is to investigate the various problems in science education in West Sumatera and its surroundings. Descriptive research method is used in the research. An addition, closed and open questionnaire instrument is applied in data collecting. The certified and non-certified teachers are selected as respondents using accidental and snowball sampling technique. The descriptive statistic and qualitative technique are performed in data analysis. Based on the investigated data, the main problems in science education in West Sumatera are (1) teacher (quality, uneven distribution and teaching load), (2) curriculum (amendment and implementation), (3) students (interest and learning creativity), (4) managerial (headmaster and leadership), (5) parents (parent or family care), (6) government (government polices), (7) community environment (lack of support), (8) infrastructure and facilities (uneven of building, laboratories, libraries, and other facilities), (9) problems of UN application as determinant of graduation, and (10) problem of teacher’s teaching burden postcertification. These findings show the science education problems in West Sumatera need to be follow up for improvement the education quality, especially in science education.
Need analysis of to development guide-module based on inquiryin respiratory and excretion topicsfor students of class XI senior high school
Authors: Sintia Minda , Sumarmin Ramadhan
Published: November 2019

Biology as a science learning essentially consists of products, processes, and attitudes that require students to invent and solve the problems. Learning science is a process of knowledge construction through the thinking activities of learners. In this situation, students are given the opportunity to develop their knowledge independently through an investigation activity. According to the 2013 curriculum, it is recommended that some of the learning models are the inquiry learning model. This inquiry model is designed to guide students directly into the scientific process through exercises that emphasize the scientific process.This study aims to determine the needs of students on the development of guide module based on inquiry for senior high school students. This research is a descriptively. The subjects were thirty students of Class XI and a teacher of Biology SMAN 7 Padang. Data collection used descriptively to book analysis instruments, curriculum analysis instruments, and interview guides. The results showed that (1)Handling teaching materials for students focus on science as a product, presentation of material has not directed students to be involved in finding knowledge, (2) Presentation of material on the students’ instructional materials has not been based on one of the recommended learning models in the 2013 curriculum. (3) Handling instructional materials for students have not been able to motivate students to learn, the pictures in the material presentation appear unclear and incomplete information, (4)The presentation of the material on the students’ teaching materials is not systematic and directed, (5) The respiratory system material and excretion require an investigation or observation of the concept of the material being studied.
Practicality of student worksheet based on concept and problem solving approach to improve student’s ability to understand concept and high-level thinking in animal development
Authors: Fitri Rahmadhani , Yogica Relsas , Lufri
Published: November 2019

The learning process requires a media that can be used as an intermediary to deliver material to students. Learning media that can be used are worksheets. This research is a development research on product (student worksheet) practicality test stage. Student Worksheets developed based on concepts and problem solving to improve students’ ability to understand high-level concepts and thinking in animal development courses. This Student Worksheet tried out to student of Biology Department in animal development courses. The results showed the student worksheet practicality value of 4.16 (practical). Based on the results of this study can be concluded student worksheet based on concept approach and problem solving to improve students’ ability to understand the concept and high-level thinking in the course of animal development is practical.
Using instructional media based on technology in west sumatera: “what are the problems faced by teachers in secondary high school?”
Authors: Yogica Relsas
Published: November 2019

Instructional media is a tool used by teachers to deliver learning material to all students. This tool plays an important role in efforts to improve learning outcomes, as a whole. The development of instructional media in the last few years is not only focused on printed media, but also media based on technology, internet and information. However, based on our observations, it is known that the use of instructional media that suits the need of students and the development of the times is still very low. Meanwhile, teachers are demanded by the government to improve the quality of education at the elementary to high level. This study presents fact about teachers in several high schools in West Sumatera, who have problems to create, to use and to empowerment of instructional media. The research method are interview and survey. The purpose of the study was to describe qualitatively the main problem of the teacher which was a barrier for them. The teacher who is the object of research works in schools in West Sumatera Province. The selection of schools was carried out by purposive sampling technique. The conclusion of the study is about the dominant factor that is become a problem for the teacher.
Needs analysis to development of biology module based on problem solving at topics of respiratory and excretory systemf to student of seniorhigh school grade XI
Authors: Mulyana Adela , Sumarmin R
Published: November 2019

Biology learning in general should consider the scientific process, where students must be able to build their own knowledge actively through meaningful learning processes. One way is to improve students ability to solve problems in accordance with one of the goals of applying the 2013 curriculum. This ability can be created with the help of teachers as facilitators and other facilities such as teaching materials. In high school students of class XI there is no official curriculum book 2013 issued minister of education. Books used by students in schools are private publications that have not been proven valid, practical and effective. Therefore, the researcher did a requirement analysis to 30 students of grade XI IPA in SMAN 7 Padang with the aim to see the need to develop biology materials based on problem solving about respiratory system and excretory system in high school student of SMA XI. Data collection using observation techniques, questionnaires and interviews with data analysis include front end analysis, students, needs and curriculum. From the analysis of data that has been done can be disclosed the results of this preliminary study are (1) teaching materials used by students still in the form of textbooks and teacher handouts that have not been proven valid, practical and effective, (2) teaching materials used not help students to improve ability solving problems, (3) teaching materials used are not in accordance with the contents of the curriculum standard of 2013, (4) students’ competence in developing problem solving skills in non-trained learning, and (5) problem solving biology-based teaching materials not yet available. Based on this it is found that the need to develop a biology-based materials problem solving about respiratory system and excretory system material in high school students XI.
Online media development of natural family planning
Authors: Asmawati Azis Andi , Faridah Arsal Andi , Bida Purnamasari Andi
Published: November 2019

This research aimed to develop natural family extension media online which can be used as alternative method of family planning, to know the effectiveness of natural family planning extension media online, and to give knowledge of reproductive health in women. The development of Natural Family Planning media using the 4-D development model developed by S. Thiagarajan, Dorothy S. Semmel, and Melvyn I. Semmel includes: Define, Design, Develop and Disseminate. Stage Develop, producing revitalized Natural Algorithm on line media based on input from experts and on-line instruments to get a knowledge of family planning and reproduction health. Furthermore, the dissemination (Disseminate). At this stage is use of Natural Family Planning extension of media online/off line that has been developed on a wider scale to conduct Natural Family Planning online/offline. Results obtained 1) Natural Family Planning media online/offline in the form of PPT Media, Video, Quiz and Forum Valid, 2) Media Extension effectively used by family planning officer of online, 3) Natural Family Planning improved female reproductive health.
An analysis of the implementation 2013 curriculum of the learning biology in senior high school at pesisir selatan
Authors: Ardi  , Rahmi Y. L. , Amazan H. M.
Published: November 2019

The 2013 Curriculum requires a balance between the attitudes, skills and knowledge competencies for students. To realize it the teacher is responsible for the implementation and success of the biology learning process in the 2013 curriculum. This study aims to describe the implementation of the biology learning process in the 2013 Curriculum in Senior High School at Pesisir Selatan District. This is a descriptive research. The population and samples of this study are all teachers who teach biology and have implemented the 2013 curriculum in the implementation of the learning process in Pesisir Selatan District Senior High School, which was held in July 2018. Data collection uses a questionnaire instrument consisting of process standards, assessment standards and the impact of the 2013 curriculum for learners and teachers in schools. Technical data analysis is done by using percentage. Based on the results of data analysis and discussion that has been done, the results showed that, on the aspect of planning implemented by teachers in obtaining criteria either with percentage of 72%, on the aspects of learning implementation obtained very good criteria with 83% percentage, and on the aspect of assessment criteria quite well with a 61% percentage.
Improvement of knowledge and attitude in conservation of mangrove and coral reefs through environmental education community network model
Authors: Sigit D V , Miarsyah M , Komala R , Suryanda A , Fadrikal R , Ichsan I Z
Published: November 2019

damage to coral reefs and mangroves results in disturbed ecosystem balance. This needs to be anticipated, one of which is through learning This research developed environmental conservation model through Environmental Education Community Network (EECN) and aimed to know the knowledge and attitude on the conservation of mangrove and coral reefs on students through EECN. This research was experimental research involving 40 high school students in the Jakarta area. Students got lectures on mangroves and coral reefs as well as observation and direct planting of mangroves and coral reefs in Tidung Island, Thousand Islands (Kepulauan Seribu, Indonesia). Knowledge data and attitudes were obtained before and after treatment. The results showed that there were significant differences to the knowledge and attitude on the conservation of mangrove and coral reefs before and after treatment. This implies that direct field recognition supplied benefits and changes in knowledge and attitudes on conservation.
Analysing problem solving skills of secondary school students by using a student worksheet
Authors: Rosdianaa L. , Ubay A. N. , Martini  , Sabtiawan W. B.
Published: November 2019

The study aimed to described problem solving skills of secondary school students using a student worksheet (SW). The design of study was pre-experimental by using quantitative descriptive approach. The parameters of the study were completion of the SW worksheet and students’ activities. The findings showed that the students achieved in enough and good criteria for stages of problem solving. They gained an average score of 3.20 (good criteria) for identifying problems, 3.10 (good criteria) for designing solutions, 2.60 (good criteria) for collecting data, 2.30 (fair criteria) for determining solutions, 2.60 (good criteria) for reviewing solutions. For the students’ activities, 56% of students’ activities were categorized in very good criteria, then 36% of activities were categorized in good criteria and 8% of activities were categorized in enough criteria. The results of observing students’ activities when using SW obtained a score of 3.38 with very good criteria. The results indicated that the students’ problem solving skills and activities in using SW were achieved well. In other words, the students were skilled and active in terms of solving problem by using SW.
Development and validation of integrated science students worksheet based on science process skills
Authors: Ramlawati  , Munatzir V , Rusli M A , Mun’im A
Published: November 2019

This research was research and development which focuses to develop Student’s worksheet based on science process skills. The development model of the research refered to 4-D model by Thiagrajan which was solved only until defining, design, and development stages. This research aims to find out: (1) Students worksheet based on science process skill in respiratory system to junior high school validity, (2) students worksheet based on science process skill in respiratory system to junior high school practicality, and (3) students worksheet based on science process skill in respiratory system effectiveness to improve student’s science process skills. The product examination used one-group-pretest-posttest design and was held in 8thgrade of SMPN 13 Makassar for second semester of academic year 2017/2018 with the number of subject was 29 students. The results showed that the instruments used fit the valid criteria, based on the student responses and science process skills tests are categorized as effective.
Development and application of learning cycle model on science teaching and learning : a literature review
Authors: Marfilinda Riri , Zaturrahmi  , Suma Indrawati Ena
Published: November 2019

The Learning Cylce Model is a contructivist instructional model whether student use their prior knowledge and experiences to construct their thinking. The purpose of this study is to review the development and application of Learning cycle model especially in the last 1 decade. Technique of collecting data was through literature study: obtained some comparisons of phases of Learning cycle models such as 3E Learning Cycle Models, 5E learning cycle model, and 7 E learning cycle models. These models are related to each other in their developments. In addition, each of them has its own characteristic.This study found that 7E LC Models can enhance educational effects : student’s Achievement, critical thinking, Science process Skills and Moral reasoning. Therefore, educators, practitioner and researcher should be supported to implement the Learning Cycle Model in Science Teaching and Learning.
STEM education to fulfil the 21st century demand: a literature review
Authors: Widya  , Rifandi Ronal , Laila Rahmi Yosi
Published: November 2019

STEM (science, technology, engineering, and math) was developed to answer challenges in the 21st century; where students are not only smart in terms of cognitive, but also skilled. STEM in education has the aim of preparing students to be competitive and ready to work according to their preferred fields. The benefits of applying STEM Education are to improve critical thinking skills and be creative, logical, innovative, productive and directly related to real conditions. The purpose of this study is to review the implementation of STEM Education models in the early 21st century. Technique of collecting data was through literature study. The results of this study: 1) STEM has been applied in various countries and in various branches of science; 2) History of STEM Education, 3) Implementation of STEM in non western country, 4) Skill that required in 21st century, 5) STEM to face 21st challenge.
The influence of peers, parents, and teachers in superior students learning problem
Authors: Istri Agung Rai Sudiatmika A A , Nyoman Suardana I , Pande Latria Devi Ni Luh , Putu Ristiati Ni , Luxiana Parwata K Yunanda
Published: November 2019

This study aimed to describe the influence of peers, parents, and teachers to the superior students learning problems. The research subjects were the superior student in SMPN 4 Singaraja who were selected using purposive sampling technique (n = 7 students). Data on the influence of peers, parents, and teachers on superior students learning problems were excavated for 60 days through questionnaires and interviews. The research data were analyzed descriptively qualitative following Bogman data analysis step which consists of 3 stages, namely: Description, Reduction, and Selection. Based on the research result, the average of superior student relationship with peers, the relationship of students with parents, and the relationship of students with the teachers, give positive influence to the problems of students’ learning (students-peers 75.87%, students -parents 62.91%, students-teachers 74.60%).
Guided inquiry learning model effectiveness in improving students’ creative thinking skills in science learning
Authors: Suardana I N , Selamet K , Sudiatmika A A I A R , Sarini P , Devi N L P L
Published: November 2019

This study was aimed at analyzing the effectiveness of guided inquiry learning model in improving students’ creative thinking skills in science learning. It was a quasi-experimental research with nonequivalent pretest-posttest control group design. The population was the eighth-grade students in secondary school. The sample included 54 students; 26 students in the experimental group and 26 students in the control group. The students in the experimental group learned through guided inquiry learning model, whereas the ones in the control group learning through direct instruction model. The data on students’ creative thinking skills were collected through the creative thinking skills test. The data were analyzed through descriptively and inferential analysis, namely the independent sample t-test with 5% significance level. The results showed that guided inquiry learning model more effective than direct instruction model in improving students’ creative thinking skills. The average score of students’ creative thinking skills in experimental and control groups were 90.0 and 79.4 respectively.
Stability analysis of surrounding rock of bedding dolomite tunnel with different dip angles
Authors: Junying Rao , Caijin Xie , Xia Zhao , Dengkai Liu , Chongxin Nie , Ning Liu , Shuai Song
Published: November 2019

To investigate the stability of surrounding rock of bedding dolomite tunnels with different dip angles, this study considers the diversity of tunnels in different geological conditions. In the case of five different bedding angles, the effects of different dolomite rock thicknesses, contact interlayer thicknesses, contact interlayer elastic moduli, contact interlayer cohesive forces, and contact interlayer friction angles on tunnel stability are analyzed. When the bedding angle is 22.5°, the surrounding rock displacement is the largest, the peeling between layers is obvious. The plastic zone of the surrounding rock is concentrated in the unsupported area of the tunnel. The contact interlayer has a weakening effect on the displacement of the surrounding rock and the expansion of the plastic zone. The thickness of the dolomite and the thickness of the contact interlayer have different effects on the displacement of surrounding rock of different bedding angles. Increasing the elastic modulus of the contact interlayer can reduce the displacement of the surrounding rock, increasing the internal friction angle of the contact interlayer has less influence on the displacement of the surrounding rock, and increasing the cohesive force of the contact interlayer can reduce the displacement of the surrounding rock.
Study on Comprehensive Evaluation on Green-targetedEnergy-saving Renovation Design for Existing Buildings
Authors: Mao Zhenhai
Published: November 2019

The renovation for existing buildings will be a trend for architectural transformation in the future. The selection of architectural design plan is a vital step for determining the effect of energy-saving renovation. Based on the analysis of renovation evaluation system for existing industrial buildings and the energy-saving renovation target for existing buildings, this paper sets up the evaluation criteria and factors and determines weight by adopting AHP to produce a quantified evaluation model, as well as makes a practical verification for a specific renovation design case.
Finite Element Analysis and Verification on Hollow Concrete Filled Double Steel Tube Short Columns Subjected to Axial Load
Authors: Xu Ming , Song Zhanfeng , Jiang Li , Ji Jing , Song Huayu
Published: November 2019

In order to study the axial compression behavior of hollow concrete filled double steel tube (HCFST) short columns, the finite element numerical simulation of five existing short columns under axial compression is carried out by ABAQUS. By choosing reasonable material constitutive model, the finite element model of this kind of short column is established, and the load-displacement curve of hollow concrete filled double steel tube short column is obtained by simulation analysis. Compared with the existing test results, the simulation data is in good agreement with the test results. The rationality and practicability of the finite element modeling method in this paper are verified. It also lays a theoretical foundation for the popularization and application of hollow concrete filled steel tube short columns in practical engineering.
Numerical Research on Axial Compression Behavior of L-shaped Steel Reinforced Concrete Short Columns
Authors: Xu Ming , Song Zhanfeng , Yang Maomao , Ji Jing , Jiang Liangqin
Published: November 2019

To investigate the axial compression performance of L-shaped steel reinforced concrete short column, thirteen specimens were designed with different steel ratio, different shear-span ratio, different strength grade of concrete, different stirrup ratio. By choosing reasonable material constitutive model, the finite element model of existing test specimens were established with the help of finite element software ABAUQS. Compared the existing test results, the simulation data was in good agreement with the test results, the rationality of finite element modeling method was verified. Based on this, the axial load-displacement curves of thirteen specimens under the axial compression were obtained, and the change regularity of axial load capacity, elastic stage stiffness and ductility with the main parameters were studied.
Effect of bedding of different dip angles on the strength of argillaceous dolomite
Authors: Shilong Mei , Junying Rao , Caijin Xie
Published: November 2019

In order to study the influence of different dip angles on the strength characteristics of layered argillaceous dolomite, the compressive strength and elastic modulus of argillaceous dolomite are obtained by uniaxial compression test. The research shows that the compressive strength and elastic modulus of argillaceous dolomite have a certain degree of dispersion; the argillaceous dolomite has strong elastic brittleness; the compressive strength of the specimen increases with the bedding angle. Generally, the trend of decreasing first and then increasing is observed. When the bedding angle is 90°, the compressive strength of the argillaceous dolomite specimen is the largest. When the bedding Angle is 30°, the argillaceous dolomite specimen has the smallest compressive strength.
Design and construction of precast reinforced concrete drain pipe in water conservancy project
Authors: xiaoling Tang , bin Li
Published: November 2019

At the bottom of slag dump site in water Conservancy projects, large diameter reinforced concrete drainage pipes are often used for drainage. Due to the large depth of burial, if the prefabricated reinforced concrete drainage pipe is damaged during construction or use, it will have a great negative impact on the safety of the project and it will be very difficult to repair. There is no relevant basis in the water Conservancy code and there are safety risks. Taking actual engineering as an example, the calculation results according to the design specifications and finite element analysis are compared and analyzed. the limitations of designing according to the water supply and drainage codes are explained. Some engineering solutions for the reinforcement design of prefabricated reinforced concrete drainage pipes with large buried depth are given out. These results can provide reference for hydraulic engineering designers.
Research on Error Correction Method of Mine Ventilation Resistance
Authors: Wei Yinshang , Li Jiangpeng
Published: November 2019

Aiming at the problems of measurement data deviation during the measurement of coal mine ventilation resistance, the principle of the base point measurement of barometer and the reason of the deviation of measurement data are analyzed. The correlation degree of the data sequence trajectory affecting the influence of the measurement data is compared. The main reasons for the deviation of the measurement data are the changes in the elevation of the measurement point, the sensitivity of the measuring instrument and the complex changes of the atmospheric pressure. Based on this, a correction method based on negative feedback adjustment is proposed. This method uses the difference between the static pressure value of the fan and the static pressure of the fan as a feedback factor by checking whether the accuracy of the calculated ventilation resistance value meets the requirements, then use the least squares method to obtain a new value to replace the original atmospheric pressure value and then solve it, so as to obtain the required ventilation resistance value. A mine ventilation simulation was performed based on the calculated resistance values to verify the availability of the corrected ventilation resistance. The method is currently applied to the Xiaojihan coal mine resistance measurement project. The results show that the method has high practicability in engineering practice, and can quickly and accurately correct the mine ventilation resistance measurement results, which simplifies the operation process and saves time.
Rutting prediction and regularity analysis of typical structures in Shandong Province
Authors: Zhang Wenwu , Wang Jian , Zhuang Wei , Chen Hao , Chen Sai , Bi Yufeng
Published: November 2019

In order to further research the development law of rutting damage in Shandong Province, Shandong is divided into four regions basedon different regional characteristics, and 2∼4 typical structures are selected in each region to fit the rutting damage prediction model. The relevant parameters (traffic flow, thickness of asphalt layer, regional characteristics) of the rutting damage were selected, and the influence on the rutting depth of each parameter was analyzed. It is suggested that the pavement structure should be differentiated designed based on the different working conditions to balance the relationship between the development of rutting damage and the initial construction investment.
Research on Owner’s Engineering Materials Purchasing Strategy under the “VAT” taxation method
Authors: Deng Xuan , Li Shiyu , Liu Wanlin
Published: November 2019

Under the current policy of switching to VAT taxation in China, there is an issue we need to consider with, that is how to use the reasonable strategy to reduce the procurement of materials in the engineering project cost. We base on the method of constructing mathematical models and actual case analysis, to analyse when suppliers provide VAT invoices with different tax rates, the owner should ask them how to discount the price of the corresponding material for the overpaid tax. The analysis results show that when the owner chooses the supplier, he should give priority to the one who can provide the special VAT invoices; when the supplier can only provide 3% of the invoice, he should require a discount of the material more than 15.45%; if the VAT invoice cannot be provided, the supplier should be required to provide a discount of 12.92% or even more.
Research on Performance Evaluation of Construction Project Management
Authors: Zhu Jing
Published: November 2019

In the construction of Engineering projects, management becomes more and more important. At present, there are not many studies on performance evaluation of construction project management in China. With the continuous improvement of project management in China’s engineering construction, the performance evaluation of project management has begun to be taken seriously. This paper mainly studies the performance evaluation system of construction project management.
Effect of the Voiding Pavement Structure for the Responding Electromagnetic Wave
Authors: Nan Chen
Published: November 2019

Voids are typical defects of pavement structure which probably causes further damages. In order to research the effect of the voiding pavement structure for the responding electromagnetic wave, a test of detecting voids using GPR was conducted to reveal the effect of frequency of principal antennas and the size of voids for responding waves. The frequency, voiding heights and voiding area affect the reflecting waves in different ways. Compared with 400MHz and 2000MHz, we can get the best apparent reflecting waves with a 1000MHz antenna. The resolution depends on the voiding area in that the reflecting wave patterns would become too fuzzy to identify when the height is less that 1cm. When the voiding area is increasing, the seismic event of diffracted waves is becoming more and more twisted. But the relationship of both arear of twisted event and the voiding area can not be determined with the patterns.
Analysis on mechanical properties of I-girder with 2000 corrugated steel webs
Authors: Li Shuqin , Li Yuelu , Yang Zhengyu , Chen Jia
Published: November 2019

In order to meet the needs of the construction of larger span bridges in engineering, the large-sized corrugated steel web with 2000 corrugated steel webs were studied. The numerical model of I-girder with 2000 corrugated steel webs is established by finite element software. The effects of bending angle, web thickness and web height on deflection and shear buckling on the basis of this are studied. The research conclusions can provide reference for the design calculation and engineering use of I-girder with corrugated steel webs in the future.
Construction project risk evaluation based on FMEA
Authors: Wang Ru , Feng Youliang , Yang Hongmei
Published: November 2019

FMEA (Failure Mode & Effects Analysis) is a preventive risk analysis technique, which purpose is to make the prevention in advance, rather than correct afterwards. Its core is to evaluate the failure mode from three dimensions: S (Severity), O (Occurrence) and D (Detection). The risk is reduced to an acceptable level by quantifying the failure mode of the risk and the cause of the key failure, and developing preventive measures to control it. Fuzzy comprehensive evaluation is a combination of qualitative and quantitative analysis, which combines the advantages of qualitative and quantitative. Combining FMEA with the Fuzzy comprehensive evaluation method, using the advantages of FMEA’s pre-existing control and full-process participation, it can make up for the shortcomings of the EX-post control higher than Ex-ante control in the current risk management, and make the risk evaluation method more perfect. It is necessary and meaningful to reduce the losses caused by the risk of projects by making effective and reasonable analysis and control of the risks that may occur in the construction project.
Application of Bored Pile Anchor Cable Technology in Foundation Pit Construction
Authors: Feng Zhengwei , Guo Peicheng
Published: November 2019

With rapid development of the city, demands for civil air defense, underground commercial and underground parking in human society have increased. Development of the construction space towards the underground is enhanced, and foundation pit excavation is widely used. Bore pile + anchor cable supporting model has been used more and more in deep foundation pit supporting. Based on engineering examples, this essay expounds the construction scheme of deep foundation pit support for a residential area project, introduces the construction technology of bore pile, crown beam and waist beam, and analyzes in detail the construction technology of the installation, grouting and tension anchoring of anchor cable in prestressed anchor cable construction. The quality control points in the construction are discussed and summarized in depth, which could provide powerful reference for the implementation of civil engineering construction tasks and ensure smooth progress of the project to achieve the expected results.
Research on sharing and integration of public open space in Shenzhen Bay Street, Nanshan district, Shenzhen
Authors: Shi Ying , Ren Daoyi
Published: November 2019

Due to the shortage of land space resources and the uneven distribution of urban space resources under the current development model, the existing urban public open space is distributed discretely in urban space, lacking systematic integration and full-cycle guidance and control and management which highlights lacking publicity. The existing urban public space can not meet the needs of public life of citizens, while the building public open space attached to the building plots that has not been utilized effectively possesses great potential for development and utilization. In recent years, the Shenzhen Bay Street complex in the Nanshan District of Shenzhen has become one of the few practical cases of the joint development design and integrated construction of urban public open space and building public open space in China. The systematic study from it can provide valuable reference for the integrated development and guidance and control of public open space in Chinese cities.
Research on Highway Landscape Design Based on Regional Culture
Authors: Li Yuanfei , Chen Fang , Jiang Dingran
Published: November 2019

In order to enhance the cultural beauty of highway landscape, the design method of highway landscape based on regional culture was studied. Firstly, the types of regional cultural elements in highway landscape are analyzed, and the carrier of regional culture and its adaptability are studied. Secondly, the principles and methods of regional culture presentation are discussed. Then, aiming at the tunnel and service area with the highest adaptability of the carrier, the highway landscape design points are analyzed. Finally, the application of regional culture in highway landscape design is studied in combination with Guangna expressway. The results show that landscape design based on regional culture is of positive significance to enhance the connotation of landscape culture and inherit the culture along the line.
Discussion on Zhejiang Provincial Water Conservancy Local Standard System in the New Period
Authors: Wang Lirong , Teng Hui , Wang Kai
Published: November 2019

At present, there is no relatively perfect provincial water conservancy local standard system in China, and no water conservancy local standard system has been established in Zhejiang Province. In order to improve the technical support of water conservancy local standards, we will play a guiding and restrictive role in water conservancy standardization. This paper expounds the current status of water conservancy local standards in Zhejiang Province, summarizes and refines the long-term practice and innovation achievements of Zhejiang Water Conservancy in various fields, and constructs the framework of Zhejiang water conservancy local standard system. According to the six professional categories, the construction content is analyzed systematically, which provides a reference for the related research on the construction of local standard system in Zhejiang Province.
Research and Application on Design of Underground Container Logistics System Based on Autonomous Container Truck
Authors: You Kesi , Yu Mingjian , Yu Qifeng
Published: November 2019

In this paper, a kind of underground passage automated freight transport system based on the autonomous dual-mode container truck is proposed, and the overall structure of the automated freight transport system, the allocation of the transportation equipment, the comprehensive design of underground passage, the comprehensive analysis of transportation organization, the reasonable layout of the freight transport terminal, and the design of connection with the overall operation of the port are studied. Taking the connection passage between the central operation area and the eastern operation area of Yantian Port under planning and construction as an example, this paper expounds the application of the underground automatic freight transport system design method in the underground container logistics system within the port area. Based on the current situation and the long-term planning requirements of Yantian Port, the overall route of the connection passage between the central operation area and the eastern operation area is studied; the dual mode transportation organization model based on the combination of autonomous driving and manned driving is designed, and the manned driving mode shall be adopted within the operation area. In the connecting tunnel, there is the interference-free, fully-enclosed, line-fixed, and no man’s land application scenario, and the autonomous driving mode shall be adopted. The corresponding ground switching area is proposed to match the dual-mode transportation system of the autonomous dual-mode truck; such switching area is composed of the mode switching area, truck storage area, and driver rest and management room. Compared with the traditional tunnels, the autonomous freight transport passage has obvious advantages in saving project cost and improving transport efficiency.
Response prediction method for tension piles considering progressive soil deformation
Authors: Liu Nianwu , Liang Yaoying , Yu Jitao , Shao Peng , Zhang Qianqing
Published: November 2019

This paper presents a analytical approach for the analysis of the response of a single pile and pile group subjected to tension load by the load-transfer approach. The shaft displacement of a tension pile is assumed to comprise the relative displacement of disturbed soil around a pile and the elastic vertical soil displacement. Considering the interactive effects among piles, a new load transfer function of the individual pile in a pile group is proposed. In addition, an effective calculate method is developed for analyzing the response of a single pile and a pile group subjected to tension load. Comparative analyses are then performed to demonstrate the veracity of the proposed method. The comparative analysis results show that the proposed approach is reliable for the analysis of the response of single piles as well as pile groups subjected to tension load.
Parameters sensitivity analysis of prefabricated prestressed concrete pavement slab
Authors: Du Chuang , Li Yanzhao , Zhang Chunxiao
Published: November 2019

The prefabricated prestressed concrete pavement with assembly construction and prestressing technology has the advantages of rapid construction and reliable quality. In this paper, a three-dimensional finite element model of the pavement structure was established by numerical simulation method. The parameters including the slab dimension, the thickness of the slab, the prestress value and position of the prestress tendon were sensitively analyzed. The results showed that the slab dimension has a critical value of 1m×1m.While the slab is larger than the critical value, the stress of the slab is almost unchanged. The thickness of the slab also has a critical value of 0.12m. When the slab is less than the critical value, the forced mode of the slab will be changed. With the increase of prestress, the stress concentration at the end of the slab will occur, but the maximum stress did not exceeded the strength of the material. It is suggested that the prestress value should be 4-5MPa. The lower the position of the prestress tendon in the slab is, the more obvious the anti-arch effect is, and it is safe to set the prestress tendon in the middle of the slab.
Non-linear Finite Element Analysis of Shear Capacity for Multiple Ecological Composite Wall
Authors: Hou Lina , Huang Wei
Published: November 2019

Multiple ecological composite wall is one of the most commonly used lateral resistance components in the ecological composite wall structure. In order to make a study of the shear capacity of the multiple ecological composite wall, based on previous research results, the finite element model of the multiple ecological composite wall is established to analyze the main influencing factors of the shear bearing capacity of the wall. The results of finite element analysis show that the main factors affecting the shear capacity are shear span ratio, ribbed bar, height of strength section, reinforcement area of end columns and concrete strength of end columns.
Based on Finite Element Method Research on Treatment Measures of Crossing Gas Pipeline
Authors: Dongyuan Wang , Zifeng Zhao , Qiuxia Tan , Chunfeng Li
Published: November 2019

The finite element method is used to analyze the stress and deformation of the crossing gas pipeline. The evaluation results show that the current pipeline stress and displacement cannot meet the allowable values specified in the specification. In order to ensure the safety of pipeline operation, it is necessary to treat the crossing gas pipeline. By investigating the pipeline construction period and operation period data, the deformation data collection and analysis of the pipeline has been carried out. It is speculated that the direct cause of the pipeline deformation is the temperature difference and the internal pressure and gravity. The indirect cause is that no appropriate compensation structure or sufficient restraint measures have been taken across the two ends. Cracking of the protective wall across the ends is a secondary failure of displacement. The finite element method is used to check the proposed governance measures, and finally determine more reasonable control measures. After the implementation of the treatment measures on the site, the better results were achieved. The pipeline stress and deformation were all within the requirements of the specification. The pipeline was in a safe state and the treatment measures were feasible and practical. The engineering application results show that the feasibility of checking the cross-section pipeline control measures by the finite element method has certain effectiveness and economic rationality, and can achieve the purpose of engineering governance.
Study on operation scheme of absorption heat pump of cogeneration units in non-heating season
Authors: Xue Qingyuan , Su Peng , Zhang Tianyang , Zhang Yanhui , Hu Yufei
Published: November 2019

This article research into cogeneration power plants’ absorption heat pump operation scheme in the non-heating season. Two technical routes for supplying domestic hot water and heating condensate water have been proposed. By analysis and calculation, concluded as follow: Schemes for supplying domestic hot water has good economic benefits; For Scheme to heat condensate water, energy-saving condition depends on the heat source of heat pumps. Using turbine extraction steam as heat source is inefficient, while use other heat sources can reduce the turbine heat rate by approximately 60kJ/kWh.
Research on mechanical behavior of circular concrete-filled steel tube arch joints with built-in opening stiffener
Authors: Gong Sai , Cheng Gao
Published: November 2019

For the concrete-filled steel tubular tension nodes, the opening stiffener can effectively reduce the stress concentration of the joints and increase the ultimate bearing capacity and tensile stiffness of the joints. For the concrete-filled steel tubular arch ribs, the steel arches are subjected to both horizontal and normal forces. Open type stiffener has an important influence on the mechanical performance of the arch rib joint, and the mechanism of the joint force transmission is more complicated. Taking a bearing circular concrete-filled steel tube arch bridge as an example, a nonlinear finite element model is established by selecting arch rib joints to analyze the influence of the setting of Open type stiffeners on the mechanical properties of CFST arch joints. The results show that after the Open type stiffener is set, the failure mode of the joint is represented by the buckling deformation of the arched steel tube and the obvious deformation of the arch rib steel pipe. The Open type stiffener avoids the void of the joint steel pipe and concrete, ensuring the steel pipe and concrete at the arch rib joint. The built-in opening stiffener is an effective form of improvement for concrete-filled steel tubular arch rib joints.
Study of the height of water flowing fracture zone based on strain energy failure criterion
Authors: Qi Donghe , Ru Xinhua , Li Dayong , Chu Fuyao , Zhang Jingkai
Published: November 2019

In order to determine the development height of the overburden water flowing fracturing zone in the upper 15 coal seam of the zhubai Coal Mine, the 15101 working face is taken as an example. The FLAC3D numerical simulation software is used to establish the stope model, and the strain energy failure criterion is used as the extension criterion of overburden water flowing fracturing zone. The development range of the fracture zone is determined by the strain energy failure criterion, and the numerical simulation of the overlying strata movement law of the coal seam roof caused by mine exploitation is carried out. A numerical simulation method based on the strain energy failure criterion for determining the plastic zone is proposed. By analyzing the damage range, the height of the overburden water flowing fracturing zone is determined. The results of theoretical and field observation are used to validate the simulation result. The height of the overburden water flowing fractured zone according to the numerical simulation result is 22.8 m. The theoretical calculations are from 14.4 m to 27.3 m and the field observation is 21.44 m. The result obtained by the strain energy failure criterion is closer to the field observations. The accuracy of the development height of the overburden water flowing fracturing zone obtained by the strain energy failure criterion is validated. This stope model may have a scientific guidance for Mining Engineer.