bluuebunny/crossref_metadata_2025 huggingface dataset:
Efektivitas Seks Edukasi Dengan Media Video Terhadap Peningkatan Pengetahuan Seks Dan Sikap Remaja Tentang Penyebaran Konten Pornografi Di SMP N 6 Rembang Purbalingga
Authors: Anindita Sinta Laksmi , Ridwan Moh. , Suyanta Suyanta , Kriswoyo Pramono Giri
Published: December 2022

Remaja merupakan masa – masa dimana sangat mudah terpengaruh baik dari lingkungan sekitar, teman sebaya dan yang marak saat ini adalah media sosial. Banyaknya kasus penyimpangan seksual, hamil diluar nikah, pergaulan bebas dikalangan remaja yang terjadi saat ini, hal ini bisa dikarenakan kurangnya pemaparan tentang seks edukasi baik di lingkup keluarga, sekolah maupun oleh petugas kesehatan menjadikan remaja tidak mengetahui tentang seks yang sehat dan benar, dan lebih memilih mencari informasi dari sumber-sumber yang tidak dapat dipertanggungjawabkan.

Penelitian ini bertujuan untuk mengetahui apakah seks edukasi dengan media video evektif terhadap peningkatan pengetahuan seks dan sikap remaja tentang penyebaran konten pornografi di SMP N 6 Rembang. Metode penelitian ini menggunakan metode pre eksperimental, rancangan penelitian menggunakan One Group Pre-tes Post-test Design. Teknik pengambilan smapel dengan Simple Random Sampling dengan sampel sebanyak 72 responden. Variabel yang digunakan dalam penelitian ini adalah tingkat pengetahuan dan sikap sebagai variabel dependent dan seks edukasi dengan media video sebagai variabel independent. Teknik analisa data yang digunakan dengan Uji Wilcoxon dengan t-test sebagai alternative. Hasil penelitian menunjukan bahwa seks edukasi efektif terhadap peningkatan pengetahuan seks dan sikap remaja terhadap penyebaran konten pornografi di SMP N 6 Rembang dengan hasil untuk tingkat pengetahuan sebesar p=0,000 (p<0,05) dan untuk nilai sikap p=0,000 (p<0,05), maka Ha diterima.
Dukungan Keluarga Meningkatkan Kepatuhan Berobat Penderita HIV/AIDS
Authors: Mahdalena Mahdalena , Maharani Vitha Amalya
Published: December 2022

Orang yang telah terinfeksi virus HIV akan sangat rentan terserang penyakit, akibat rusaknya sistem kekebalan tubuh. penderita HIV/AIDS dalam kesehariannya dituntut untuk mampu menghadapi permasalahan yang cukup kompleks. Penderita HIV/AIDS tidak hanya dihadapkan pada permasalahan dari sisi fisiologis akibat terinfeki HIV, tetapi juga dihadapkan pada stigma dan diskriminasi yang dapat menambah beban psikologis mereka. Kompleksnya permasalahan yang mesti dihadapi oleh penderita HIV/AIDS tentunya dapat berimbas pada penurunan kualitas hidup. Salah satu faktor yang memiliki peranan penting dalam kualitas hidup penderita HIV/AIDS adalah dukungan keluarga, oleh karena itu penelitian ini bertujuan mengetahui dukungan keluarga terhadap kepatuhan berobat penderita HIV AIDS di rumah sakit dr. H. Ansari Saleh Banjarmasin. Penelitian ini merupakan observasi analitik dengan pendekatan cross sectional. Sampel penderita HIV AIDS yang berobat di Rumah Sakit dr. H. Moch. Ansari Saleh Banjarmasin. Hasil penelitian menunjukan sebagian besar (52%; n\39) keluarga mendukung tetapi ada juga keluarga tidak mendukung berjumlah 6 responden (8%) dan yang kurang mendukung berjumlah 30 responden (40%). kepatuhan mengikuti program pengobatan adalah 32 responden (42,7%) dan yang tidak patuh berjumlah 43 responden (57,3%).  Berdasarkan uji regresi ordinal didapatkan nilai p = 0,554 dan α = 0,05. berarti tidak ada pengaruh dukungan keluarga terhadap Kepatuhan Mengikuti Program Pengobatan HIV/AIDS di RSUD Dr. H. Moch. Ansari Saleh Banjarmasin.
Pushover Analysis of Open Ground Storey (OGS) Coupled with Shear Wall Considering Infill Wall Stiffness – A Case Study
Authors: Salsal Yousif Mustafa , Pragalath D.C. Haran
Published: December 2022

Open Ground Storey buildings (OGS) are commonly constructed in the UAE, since these buildings has some functional advantage as parking, shop etc. However, they can be a hazard during an earthquake. In this study, a real building located in Al Muraqqabatm Dubai is chosen. This building is a type of OGS building coupled with shearwall. To understand the behaviour and strength of buildings a non-linear Static Analysis (Pushover Analysis) is carried out to determine the force capacity by applying lateral load from different direction that will allows to evaluate the building beyond elastic range. Building frame were analysed, for bare frames and infilled frames. Seismostruct [1] software was used for analyses to understand as Lateral Displacement profile, Storey Shear, Storey Drift and Base-shear force, in a result to generate Capacity Curve for both frames.
Study on Simplified Calculation Method of Horizontal Displacement of Wharf Pile Foundation Under Horizontal Cyclic Load
Authors: Hu Ning , Zhang Yuting , Yang Ligong
Published: December 2022

The upper structure of high piled wharf in coastal soft soil area is loaded by waves or ships, which is transferred to the foundation soil through the pile foundation. The force is small and lasts for a long time, which causes the strength of saturated soft clay in the vibration range to decrease slowly, and the weakening effect of soil gradually accumulates, resulting in the horizontal displacement of pile foundation. In this paper, the maximum horizontal displacement and residual horizontal displacement of pile are deduced and calculated by the analytical method through appropriate simplification, considering the stiffness of pile group, plastic deformation of soil and cyclic weakening. A simplified calculation method of horizontal displacement of pile under horizontal cyclic load is obtained. Compared with the numerical simulation method, the results show that the simplified calculation theory of pile horizontal displacement under horizontal load can better reflect the displacement development law of pile, and then can predict the long-term deformation of pile.
Design Strategy of Building Components Based on Passive Ventilation Technology
Authors: Du Yan
Published: December 2022

Today, with the popularization of mechanical ventilation and refrigeration technology, humans have freed themselves from the constraints of nature and effectively improved and created a comfortable indoor microclimate. At the same time, the energy consumption of buildings and the consumption brought by these energy sources have greatly changed our living environment and caused serious energy and environmental consequences, making people re-examine the passive energy-saving technology. Taking the natural ventilation design method as the main line, taking the excellent energy-saving building case as the starting point, focusing on the building components, this paper compares and studies the form of the building based on the passive natural ventilation technology.
Research on the Application of Intelligent Curing System of Cement Concrete Precast Beam
Authors: Wang Tong , Zhang Sulong
Published: December 2022

In order to solve many disadvantages of the artificial water curing method commonly used in precast beam yard, control the curing quality of precast beam, the intelligent curing system of cement concrete precast beam is developed, which adopt wireless sensor and automatic control technology collecting the temperature and humidity data of cement concrete components, when the preset threshold value is exceeded, the intelligent linkage curing robot can automatically control water quantity, spray frequency, curing time, intelligent water supplement in curing cycle in the curing process. The practice shows that the system can achieve all-weather, no dead angle continuous curing, effectively save water, reduce personnel input, improve the early strength of concrete, reduce the development of shrinkage cracks, and effectively improve the standardized, accurate and intelligent level of concrete precast beam curing work.
TMD Vibration Reduction Design of Large-Scale Structures
Authors: Hou Yingyu , Hou Shiqing , Liu Ziqiang
Published: December 2022

With the development of science and technology, the process of urbanization is accelerating, and many structures are developing towards the trend of large-scale. The emergence of large-scale structures such as aircraft, buildings and bridges provides a more comfortable and convenient living space for human beings, but there are also some mechanical problems in the design and manufacturing process of these large-scale structures. For example, due to the influence of size, wind load, earthquake and other load forms will have a great impact on the structure. According to the above requirements, this paper designs a structural vibration reduction design based on tuned mass damper (TMD), and analyzes its application effect. The analysis results show that this design method is a simple, effective and economical control method, which can effectively reduce the acceleration and displacement of large-scale structures under vibration.
Ground Motion Effect of River Valley Sites Based on FLAC3D Numerical Simulation
Authors: Li Ping , Xu Jianyuan , Li Yuying
Published: December 2022

The study of ground motion effects at river valley sites is an important guide to site selection and seismic design. In this paper, FLAC3D numerical simulation is used to explore the influencing factors of a river valley site. By selecting four influencing factors with different input ground motion spectrum characteristics, ground motion intensities, site slope angles and depth-to-width ratios, orthogonal test forms are designed to determine the calculation conditions, and numerical simulation analysis is conducted. The study obtains the ranking of influencing factors for the top section of the slope, slope section and valley bottom section at different locations of the river valley site. The main influencing factor is the spectral characteristics of the input ground motion; the main influencing factor of the slope section and the valley bottom section is also the spectral characteristics of the input ground motion; and the overall analysis of the amplification effect pattern of the trapezoidal valley site shows that the amplification effect of the valley bottom site is the smallest and that the amplification of the slope top site is the largest.
Research on Application of BIM Technology in Bridge Health Monitoring
Authors: Gao Xinxue , Sun Yinglin , Wang Hongyun , Yang Zeying , Feng Zehuan , Wang Chenghe
Published: December 2022

In order to improve the intelligent level of man-machine interaction and auxiliary decision, this paper takes a bridge as the engineering background, selects box girder, pier, cap, pile foundation and so on to carry out parametric modeling. The secondary development process of Revit was explored. Based on IFC framework, Revit API functions were used to expand the data dimension of Revit. To make the bridge health inspection system redundant data visualization, to present the effect of real-time data model, can more intuitively understand the health of the bridge, the bridge disease status to make real-time diagnosis, early warning, and put forward the disposal countermeasures. Through the analysis of the model and data, the influence of the bridge under different climate conditions can be understood, so as to work out the most suitable bridge management and maintenance plan, increase the work efficiency in the operation and maintenance stage, and reduce the waste of funds.
Structural Design Study of Suspended Glass Trestle Based on Construction Technology
Authors: Gao Rui , Li Silong , Xing Yi , Feng Junping , Xie Lei , Guo Peng
Published: December 2022

With the continuous development of science and technology, construction technology nowadays is also developing continuously. As one of the tourism supporting facilities, glass structures are expanding rapidly in major mountain-type scenic spots at home and abroad, and are highly sought after by tourists and scenic spots. As a representative of the modern humanistic landscape system, glass structures, especially those located in mountainous scenic areas, not only carry the function of communication paths and viewing platforms, but also are humanistic landscapes of space pictures, which not only enrich the style of experiential tourism, but also have the dual role of tourism infrastructure and humanistic landscape, and their role as leisure and vacation products can also be developed and explored. Mountain-type landscape glass structures are increasingly popular and attention. Glass structures to give tourists a unique experience of adventure align with the development trend of tourism. Various scenic spots have built glass walkways, glass bridges, glass observation platforms, etc. to attract tourists’ attention, create scenic features and enhance the competitiveness of scenic spots. The purpose of this paper is to study the structural design of the suspension glass trestle based on building technology. This paper uses BIM technology in modern construction technology to design the structure of a suspension glass trestle, uses the existing calculation theory of suspension bridge, optimizes the structural system arrangement of suspension glass trestle by studying the influence of the structural system arrangement of the suspension bridge on its static and dynamic performance, and implements the project engineering using the relevant theory.
Research on Dynamic Characteristics of Tunnels Under Complex Conditions
Authors: Liu Yun , Lai Jie , Wang Wei , Gao Qiangchen
Published: December 2022

Application of immersed tunnels started late in China, and it has complex construction conditions with many factors to be considered. Therefore, it is of great importance to obtain the seismic response of immersed tubes under complex environment conditions. Based on the simplified mechanical model of the waterstop of the tunnel joint. In this paper, the structure for the immersed tunnel was established, the expression of the interaction relationship between the structure and the soil body was analyzed, and the dynamic response properties and stress properties of the tunnel structure were obtained. It was concluded that the top and bottom of the tunnel should be reinforced compared to the waist of the tunnel.
Study on Carbonation and Chloride Ion Erosion Resistance of Concrete Used in Metro Engineering
Authors: Li Huirui , Yao Hua
Published: December 2022

In view of the cracking problem of mass concrete caused by excessive amount of cement, concrete for metro engineering was prepared by the cementing material system with a large amount of mineral admixture, and the influence of the different cementing material system and specimen curing age on its durability was systematically studied. The results show that the carbonation depth of concrete specimens increases rapidly in the early stage of carbonation, but slows down in the late stage of carbonation. When the amount of cementing material is the same and the curing age of specimens is 28 days, the amount of cement is the key factor affecting the chloride ion permeability resistance of concrete. After the curing age reaches 84 days, the amount of mineral admixture has a great influence on the chloride ion permeability resistance of concrete. After comprehensive comparison of carbonation resistance and chloride ion erosion resistance of concrete used in metro engineering, it is found that its durability is good, which can meet the durability requirements of major projects with strict service requirements, such as the metro in China.
Research on the Construction Technology of Gable Wall of Traditional Wooden Hsien-Shan Architecture in Northern Jiangsu: A Case Study of the Canal Longwang Temple
Authors: Zhang Meng , Chun Qing , Peng Bei
Published: December 2022

At present, the academic research on traditional wooden buildings mainly focuses on the construction methods of Southern Jiangsu, but there is little in Northern Jiangsu, leading to difficulties and deviations in the conservation of traditional wooden buildings in it. This paper investigates the construction law and regional characteristics of gable walls by adopting the Canal Longwang temple, a typical Hsien-shan architectural complex in Northern Jiangsu, as a case study and analyzing the differences in construction techniques of gable walls between North and South Hsien-shan buildings. The findings will help enrich the research on the construction craft of historical buildings in Northern Jiangsu and provide a solid scientific basis for conserving regional historical buildings.
An Overview of the New Method of Vacuum Preloading for Ultra-Soft Soil Foundation Engineering
Authors: Shu Guozhi , Meng Zhaohui
Published: December 2022

The vacuum preloading method has achieved good results in the foundation treatment of similar ultra-soft sedimentary soils, and has been gradually recognized and adopted by the industry. This paper summarizes and introduces different types of new vacuum preloading methods at home and abroad, and analyzes the characteristics and research progress of different vacuum preloading methods. The results show that although the vacuum preloading method has been continuously innovated and reformed in practice, the defects of the vacuum preloading method itself cannot be completely avoided, especially in the ultra-soft soil foundation with ultra-high water content and high content of floating mud. Many problems emerged in the process of dealing with it, and it is urgent for scholars to continue research and development.
Bayesian Model Updating with Adaptive Importance Sampling Using Gaussian Mixture: Case Study for Dynamic Analyses of 1-Story Moment Frame with Viscous Damper
Authors: Xiao Xiong , Li Quanwang , Cao Mai , Yuan Ze , Zhang Yaotian , Wang Zeyu
Published: December 2022

Bayesian model updating provides a powerful and comprehensive framework for engineers to assimilate up-to-date observation data into models based on probability theory and significantly reduces model uncertainties. By integrating the concept of population Monte Carlo within the cross-entropy method, a novel adaptive importance sampling (AIS) algorithm is recently proposed to conduct robust and fast model updating using Gaussian mixture. This algorithm has been proved to enable constructing an importance sampling density (ISD) that mimics the target posterior density and is adopted in this paper to tackle a seismic analyses problem of 1-story moment frame with viscous damper. Results showcase that the distributions of parameters can be successfully updated using the algorithm with low computational cost. The updated results can also be further leveraged to guide the seismic safety assessment.
Void Detection Behind a Hydraulic Tunnel Lining Containing Complex Reinforcement Using Combined Non-Destructive Testing Methods
Authors: Yang Jianxi , Zhang Shenghang , Tang Lei , Li Jun , Pan Wenming
Published: December 2022

The existence of voids behind the lining has always been a “pain point” in tunnels. In recent years, prestressed concrete linings have been so densely reinforced that voids cannot be accurately detected using a single non-destructive testing method. A standard model of Voids behind the lining with reinforcement parameters, concrete mix ratio, thickness and material inside the void consistent with the actual project was produced. Based on this model, ground-penetrating radar, impact echo and ultrasonic laminar imaging detection tests were carried out and typical mapping of the various methods was obtained. Combined with the applicability of the practical operation in engineering, combined non-destructive testing methods is proposed and verified in actual engineering. The results show that the combined non-destructive testing methods can accurately detect voids of lining, and can take into account the detection efficiency to meet the detection requirements of complex reinforced linings.
Sectional Model Wind Tunnel Test and Research on Wind-Induced Vibration Response of Curved Beam Unilateral Stayed Bridge
Authors: Chen Jiahao , Zhao Shuang
Published: December 2022

Sectional model wind tunnel tests and numerical simulation are general methods for studying a curved beam unilateral stayed bridge (CBUSB) to clarify the influence law of the bridge curve linear distribution on wind-induced vibration characteristics of stayed bridges. Aerodynamic force and wind-induced displacement responses are obtained using aerodynamic force and sectional model vibration tests, respectively. Based on experimental results, the finite element model is used to analyze effects of five curvature parameters on the displacement, acceleration, and cable tension of CBUSB. Results show that the displacement and acceleration of wind-induced vibration are restrained as the curvature increases, and the high-order modal vibration of the bridge is stimulated, which shows that the high-frequency vibration reduction should be considered for pedestrian comfort control at high wind speed, and a broadband vibration reduction method can be used.
A High-Precision GNSS Data Post-Processing Framework
Authors: Pang Jiahao , Chen Huizhen , He Jie , Xu Caixu
Published: December 2022

Efficient and accurate GNSS data post-processing can greatly improve the efficiency of mapping work, this paper outlines the mathematical model of GNSS control network data processing and solving process, uses the data processing software GGO of Guangzhou Gio Electronic Technology Co. The results of the baseline solution and the difference between the baseline solution and the solution of the Leica LGO and COSA software are compared. The results show that the baseline solution and net leveling solution can be correctly performed with the software of this framework, and the error of baseline solution is within 3 mm in each direction compared with LGO, and the error of net leveling result is within 2 mm compared with COSA, which is sufficient to meet the requirements of engineering practice.
Application of Reinforced Earth Ecological Brick Retaining Wall in Open Channel Engineering
Authors: Xu Long , Cao Wei , Hu Yifan , Lu Yanhui
Published: December 2022

The traditional open channel slope protection retaining wall structure generally adopts cast-in-place concrete, mortar or dry masonry stone, gabion structure, ecological bag, etc. The construction of these structural forms of retaining wall has a single function, huge labor consumption, and a large number of on-site use. Mortar and concrete cause serious environmental pollution, and they only play a protective role on the slope surface, failing to plant flowers and plants, beautify the environment, and have no ecology at all; although some plants and flowers can be planted, the effect of soil erosion control is not ideal, such as Poor maintenance can easily cause safety hazards. By adopting the retaining wall form of reinforced soil ecological brick retaining wall, the open channel project overcomes the shortcomings of traditional retaining walls, has both safety and ecological functions, and integrates landscape, energy saving and environmental protection. This paper expounds in detail the main construction technology, procedures, and quality operation points of the reinforced soil ecological brick retaining wall, summarizes the characteristics and advantages of its technological structure, and provides guidance for the application of other similar projects in the future.
Experimental Study on Mechanical Properties of Laminated Bamboo Board Rubber Isolation Bearing for Rural Buildings
Authors: Wu Chen , Liu Chengqing , Lou Yanning , Sheng Tao
Published: December 2022

A new type of isolation bearing with advantages of low carbon, low cost and light weight is designed for rural buildings by using reinforced and recombined bamboo board instead of steel plates. First, the compression shear static load test of the reinforced composite bamboo board is carried out. The results show that: When the pure pressure is 20 MPa, the through cracks begin to appear along the grain direction of the bamboo board; When the pressure bearing capacity is 5 MPa and the shear bearing capacity is 3 MPa, there are a few cracks in the transverse direction, but they still have integrity. Then, taking a double story rural building in Wenchuan County, Sichuan Province as an example, a new type of bearing is used to design the base isolation scheme, and the quasi-static test was carried out. The results show that: (1) During the small earthquake, the bamboo board is not cracked, and the support remains intact. The shear stiffness in the longitudinal direction is about 30% higher than that in the transverse direction, and the equivalent damping ratio in the longitudinal and transverse directions is about 5%; (2) During the medium earthquake, a few cracks appear in the bamboo board, but the support is still intact. The stiffness along the grain direction is reduced by about 20%, but the damping ratio remains unchanged, and the mechanical properties along the grain direction are not affected; (3) During a large earthquake, there are many cracks in the bamboo board, but the bearing can still effectively bear the load. The stiffness in the longitudinal direction is further reduced by about 13%, and the transverse direction is basically unchanged. The damping ratio in the longitudinal and transverse directions is increased to 8–10% respectively. Therefore, the new isolation bearing is feasible.
Research on Simulation and Verification of Flow Characteristics of Three-Way Control Valve Under High and Low Pressure Conditions
Authors: Zhou Aimin , Zhou Xu , Cao Wei , Chen Liang , Li Shuxun
Published: December 2022

Aiming at the problem of lack of numerical simulation research and test conditions for the flow coefficient of the main bypass circuit of the three-way control valve under the high pressure actual working conditions, taking the DN250 three-way control valve as the research object, a method to modify the flow coefficient under low-pressure test conditions to obtain the flow coefficient under high-pressure actual working conditions is proposed. CFD method is used to simulate and study the flow characteristics of the main control circuit and bypass circuit of the three-way control valve under low-pressure and high-pressure conditions under 10% ∼ 100% typical opening, calculate the corresponding flow coefficient kV, and correct the test flow coefficient under low-pressure test conditions according to the proposed correction conversion relationship of flow coefficient under high-pressure and low-pressure conditions, so as to obtain the flow coefficient under high-pressure actual conditions, which is verified by experiments. The results show that the trend of the corrected flow coefficient curve under high pressure condition is consistent with the test flow coefficient curve, and the average error between the corrected flow coefficient and the test is less than 3%, which proves that the correction method has good accuracy and can be used to predict the flow coefficient under high pressure actual condition.
Design of Super High-Rise Sightseeing Area of Zhonghai Chengdu Tianfu New Area
Authors: Zheng Yong , Luo Liang , Liu Yu
Published: December 2022

Super high-rise buildings are often the image display windows of a city. The sightseeing area located in the tower crown is not only the concentrated expression of the shape and culture of super high-rise buildings, but also meets the needs of shape, function, safety and comfort at a height of several hundred meters above the ground. It needs to solve various technical problems. This paper takes the super high-rise sightseeing area (hereinafter referred to as Tianxin sightseeing area) of Zhonghai Chengdu Tianfu New Area as an example, and makes overall design from the aspects of functional traffic organization, fire evacuation design and thermal comfort design, so as to realize the perfect integration of functional requirements and spatial modeling of the sightseeing area.
Calculation of Short-Term Deflection of a Composite Slim Floor with Single Span
Authors: Han Chunxiu , Wang Peng , He Huanlin
Published: December 2022

For the problem of stiffness calculation of a composite slim beam with reinforced concrete composite truss slab as floor slab, the short-term deflection of the slim beam is calculated and analyzed by theoretical and numerical methods. The result shows that the load-deflection curve is linear in the middle span of the composite slim beam, and the cross section of the composite slim beam is the ideal cross section. The stiffness of the composite flat beam can be calculated according to the linear elastic theory. The concrete area is converted into steel beam area by the method of conversion section, and then analyzed by the method of material mechanics. The elastic deflection obtained by the theoretical formula is in good agreement with the finite element analysis. The load – displacement curve of a single span composite slim beam is obtained by numerical simulation using finite element method. The curve is nonlinear. In front of the concrete cracking (the load reaches 25% of the failure load), the curve is accord with the theoretical calculation of the elastic curve, then the curve of the finite element calculation is along the horizontal deviation, especially when the load applied to 45% of the breaking load, then the offset value increase, this match the experimental analysis of the early stage of our research team is good.
Study on Deformation Characteristics and Instability Failure Mode of New Suspended Diaphragm Wall Deep Excavation in Soil-Rock Strata
Authors: Li Longping , Wang Linfeng , Zhou Xiaohan , Bai Yunlu , Xu Qiang
Published: December 2022

In the design of suspended diaphragm wall of existing soil-rock foundation pit, the bottom of the wall needs to reserve rock shoulder to provide embedding, and prestressed anchor should be used to lock the foot at the same time. It is the first time to propose a new type of suspended diaphragm wall supporting structure without rock shoulder and prestressed anchor, and makes full use of the inner struts and the middle plate of the underground structure to form a stable system, which lacks engineering experience and theoretical verification. By means of numerical simulation, the deformation characteristics and instability failure mode of soil-rock foundation pit supported by the new type of suspended diaphragm wall were discussed. The research shows that: (1) The deformation of the excavation meets the requirements under the supporting of the new suspended diaphragm wall without rock shoulder. The deformation of the wall mainly occurs in the soil section, and the deformation is mainly caused by the lateral water and soil pressure of soil. The shear stress distribution of the rock section shows that the top of the rock section is not the control point, and there is no need to take additional measures. (2) The method of ground overload can cause the damage of the supporting system components. At this time, the deformation of the rock section is still small, and the safety reserve of the rock wall section is higher than that of the supporting section. (3) By increasing the stiffness of the upper supporting structure to ensure the stability of the upper supporting structure, and increasing the ground overload to study the failure mode of the lower rock section, it is found that the failure mode of the lower rock section is that the shear stress exceeds the allowable shear strength and produces a sliding surface, and the maximum shear stress occurs at the junction of the rock section and the basement.
Geological Suitability Evaluation for Urban Underground Transportation Space Utilisation in Soft Soil Area
Authors: Hu Zhi , Xiao Danqiang , Wang Jinchang , Yu Yiqiang , Yan Xin , Zhan Wei
Published: December 2022

Geological suitability evaluation of urban traffic underground space utilisation is an important basic work in urban planning, especially for soft soil areas. In this study, firstly, on the basis of analyzing the influencing factors of urban underground transportation space utilisation in soft soil areas, and considering factors such as topography, geotechnical properties, hydrogeology, and existing constructions, an evaluation index system was constructed. The index weights are comprehensively determined according to expert scores and literature research. Then, the evaluation index is quantified by AHP (analytic hierarchy process) method and the suitability of the study area was calculated by multi-objective linear weighting method according to the established evaluation model. Finally, taking Wenyi Road in Hangzhou as an example, using the established evaluation index system and evaluation model to carry out the application research of geological suitability evaluation of underground space utilisation. The research results can provide technical reference for the utilisation of urban traffic underground space in soft soil areas.
Discrete Element Numerical Study on the Influence of Different Three-Dimensional Boundaries on the Triaxial Test of Granite
Authors: Wang Zhilin
Published: December 2022

The boundary has a serious influence on the mechanical properties of the rock, so 27 sets of triaxial simulation tests were established to study the influence of the boundary on the mechanical properties of the rock. Based on Particle-Flow-Code, generating granite by using the grain-based model, at the same time, triaxial tests under the boundaries of rigid, flexible and shell element were established respectively by using the FDM-DEM coupling technology. The results show that the boundary will affect the peak strength, failure shape and stress concentration of the sample. Rigid boundary can easily lead to stress concentration in rock samples. The flexible boundary will cause the actual confining pressure of the rock sample to be larger than the target confining pressure during the triaxial loading process, and significantly increase the residual strength of the sample. While the sample under shell boundary has smallest probability of stress concentration and stable confining pressure. Therefore, the shell boundary should be used in the triaxial test of discrete element simulation.
Study on the Calculation of Attenuation Quality Factor Q-Value in Microseismic Monitoring: Results from Two Rock Engineering Cases
Authors: Zhu Xinhao , Chen Bingrui , Cao Dongfang , Wang Xu , Wang Qing
Published: December 2022

The quality factor Q-value is one of the important parameters for calculating microseismic source parameters, and it is also an important reference for reflecting geological information. However, there are few studies on the Q-value of rock engineering at present, and its understanding needs to be further improved. For the above reasons, we adopted the widely used Atkinson method to calculate Q in two rock engineering. The results show that the Q in the microseismic monitoring is mainly on the order of 101∼102, which is generally smaller than the Q in earthquake seismology. When the frequency is less than 500 Hz, the Q is a constant, and when the frequency is greater than 500 Hz, it increases with the frequency. The research results also show that the Q in the engineering with high in-situ stress and complete rock mass structure is larger than that in the low in-situ stress and broken rock mass is relatively broken, indicating that the Q-value can reflect the geological information to a certain extent.
Effect of Radial Guide Vane Optimization on the Performance of Multistage Centrifugal Pump
Authors: Li Lu , Li Chenhao , Luo Xingqi , Feng Jianjun , Zhu Guojun
Published: December 2022

The optimization of radial guide vane structure is the key measure to reduce the hydraulic loss of the component. The research model for this paper is a multistage centrifugal pump with a radial guide vane. Based on the SST k–ω turbulence model and using CFD numerical simulation technology to imitate and forecast multistage pump performance. The influences of radial guide vane blade numbers and return guide vane circumferential distribution position optimization on the multistage pump transportability are studied. The internal fluidity characteristics and transport performance of multistage centrifugal pumps with different guide vane structures are obtained. The results show that the hydraulic efficiency increases by 1.11% when the number of return guide blades is 9. When the return guide vane rotated 8° axially, had best performance optimization result, the efficiency and head of centrifugal pump are increased by 0.54% and 1.54% respectively. The change of circumferential distribution position will increase the ratio of hydraulic loss of radial guide vane, while the ratio of hydraulic loss of volute decreases. The research results can provide reference for radial guide vane optimal design of multistage centrifugal pump.
Influence of Partially-Covered Riparian Vegetation on Flow in a Compound Channel
Authors: Guan Yutong , Tang Xiaonan
Published: December 2022

Vegetation is of great importance in hydraulic engineering as it can affect the flow structures of compound channels in many ways, including the velocity profiles, momentum exchange, and shear stress distributions. This complex flow structure in vegetated compound channels has attracted more and more research interests. However, most of the previous studies have been focusing on fully-covered vegetated compound channels, there are little studies on compound channels with partially vegetated floodplain. This research carried out novel experiments to investigate the flow structure of compound channels with partially-covered vegetation on the floodplain. The results showed that the discharge of the main channel decreases as the depth ratio increases. The retardation effect of vegetation on the flow of non-vegetated floodplain region decreases with the increasing water depth. In addition, the vertical velocity profile in the vegetated zone performs differently in various depth ratios, with its velocity taking a maximum around the middle-water depth zone under emergent cases, while being the maximum near the free surface under submerged cases.
The Characteristics of Waterlogging in the Pearl River Delta Urban Agglomeration from 2007 to 2019
Authors: Mo Wenxiong , Luan Le , Liu Junxiang , Fan Weinan , Xu Zhong
Published: December 2022

With the advancement of urbanization, waterlogging disasters in China’s urban areas have increased significantly, especially in the Pearl River Delta region. Based on the literature published by government departments, this study analyzed the characteristics of urban waterlogging in the Pearl River Delta region from 2007 to 2019. The results show that the frequency and intensity of waterlogging disasters in the Guangdong-Hong Kong-Macao Greater Bay Area are very high. The types of rainfall that cause flooding mainly include strong convection, frontal rain and typhoon rain. In Guangzhou, the causes of waterlogging can be divided into external and internal causes. The external causes are extremely heavy rainfall and the tidal flooding of the outer river. The internal causes mainly include the hydrological effect of urbanization, the low standard of the drainage system, the insufficient function of flood drainage, and the poor management of flood control projects. These information determined in this study facilitates reasonable flood mitigation measures to be developed at the most critical locations in this region.
Research on Fracture Characteristics of Hard Rock of High Stress Underground Powerhouse
Authors: He Jianhua , Zhao Jinshuai , Qin Yang , Chen Bingrui , Feng Guangliang , Wang Qing , Mo Wenqiang
Published: December 2022

Underground caverns of hydropower project have significant mechanical properties of high stress, high sidewall, large span, complex geological conditions and mutual disturbance of adjacent cavern construction, resulting in very complex deformation and rupture characteristics. Through the laboratory triaxial compression experiments, the mechanical response of deformation and failure mechanism of granite is explored, and the elastic-brittle mechanical properties are also revealed. With the help of high precision microseismic (MS) monitoring system, the inoculation law of the internal fracture initiation, expansion, intersection and penetration of the surrounding rock is captured, and the inoculation mechanism of the rock macroscopic damage is also clarified. The research results of this paper enrich the database of rock mass failure cases of rock cavern, which can provide support for the control of rock mass fracture.
Study on the Deformation and Stability of Flood Discharge Atomized Slope
Authors: Zhang Ying , Li Xiaomin , Huang Peng , Ding Xinan , Zhu Wenxiu
Published: December 2022

Flood discharge atomization is the large-scale rainfall and diffuse phenomenon in local area of downstream during hydraulic engineering flood discharge, which endangers the normal operation of hydraulic structures and stability of downstream bank slope. This paper compares the safety of the flood discharge atomized slope after 13 days’ flood discharge and 7 days’ drainage with 4 and 5 drainage tunnels respectively. The results show that the slope is stable both in the natural and rainstorm condition, and it still stable in the long-term fog and rain condition. Atomized rain infiltration, the slope displacement increase, and the maximum value appeared in the whole slope reached saturation point, and the displacement is reduced after the flood stop. Except for the slope foot, the calculation results of the two drainage tunnel design schemes have little difference, and the addition of a drainage tunnel is beneficial to suppress the water head at the slope foot, which provides the basis for the design of the slope support.
Study of Impact Loads on Self-Elevating (Self-Supporting) Crossing Frame Body
Authors: Mao Hua , Tang Jipeng , Meng Fanhao , Ma Yong , Sun Lijiang , Shi Qiang
Published: December 2022

External impact load resistance of self-elevating (self-supporting) crossing frames (hereinafter referred to as “crossing frames”) is one of the important mechanical properties. The risk and cost are high for studying the influence rule of a single parameter on external impact loads on crossing frame carrier cables by test method. To explore the influence rule of the dropping wire position, dropping wire height, crossing distance and wire type on impact loads, the parametric modeling method for wires impacting crossing frames is studied. The simulation results show that the working condition where dropping wires are in the middle of the crossing frame is the most dangerous, and the impact loads rise with fluctuation with the increase of the dropping wire height. Due to the randomness of impact, the crossing distance and wire type have no obvious effect on the change of impact loads.
An Adaptive and Environmentally Friendly Simulation Optimization Method for Optical Storage Microgrid
Authors: Ji Qingfeng , Wu Xiaogang , Wu Xinhua , Wu Mengkai , Xu Wentao
Published: December 2022

In recent years, with the global warming, distributed photovoltaic and energy storage have developed rapidly under the background of carbon peak and carbon neutralization. Photovoltaic can be added to the microgrid as a distributed energy, but the volatility and randomness of photovoltaic itself will reduce the stability of the entire electric system, and even affect the operation of the microgrid. The introduction of energy storage media brings a new chapter to improve the stability of power system, improving the income of microgrid, and reducing the volatility caused by photovoltaic power generation. With the gradual implementation of the real-time electricity price policy, the use of energy storage system to obtain economic benefits will be an economic direction of the future micro grid. Therefore, based on the analysis of the operation principle of photovoltaic and energy storage, this paper uses MATLAB to establish the simulation control model of photovoltaic and storage DC bus grid-connected, and verifies the rationality of photovoltaic and storage grid-connected. Secondly, the multi-objective mathematical modeling was carried out by minimizing the total cost, pollutant emission and energy storage utilization of microgrid. Finally, an improved multi-objective PSO algorithm is proposed, which combines the fast optimization ability of particle swarm optimization algorithm with the strong global search ability of artificial fish swarm algorithm, optimizes the economic operation of photovoltaic storage microgrid, and improves the solution performance of the algorithm.
Study on the Fire Resistance of Supports and Hangers in Different Working Condition
Authors: Zeng Xubin , Yang Lizhong , Liu Wei
Published: December 2022

In this study, the typical application of supports and hangers in the water supply and drainage system, ventilation and smoke extraction duct system and electric or optical fiber system has been collected and investigated, in order to understand the fire resistance of supports and hangers used for service installation in China, and further optimize the fire testing and evaluating method of these products. A series of fire resistant testing for supports and hangers used in different working condition have been carried out and the effect of bearing load and structure on the fire resistance of supports and hangers has also been discussed in this paper. Moreover, the improved fire resistant testing and evaluating method has been proposed here.
Micromagnetic model analysis of dual field generation layer (FGL) spin torque oscillators (STO) for microwave-assisted magnetic recording (MAMR)
Authors: Itagaki Ryo , Kanai Yasushi , Greaves Simon
Published: December 2022

Dual field generation layer (FGL) spin torque oscillators (STO) were investigated for use in microwave-assisted magnetic recording. The STOs were integrated into the gaps of write heads for stable oscillation. According to preliminary calculations, a FGL thickness of 5 nm was suitable, while the volume of 7.5 nm and 10 nm thick FGLs was too large and they did not oscillate stably. The most dominant factor influencing the FGL rotation was found to be the strength of the antiferromagnetic coupling between the FGLs. Other parameters were also varied, e.g., the exchange coupling between the negative spin injection layer (nSIL) and the trailing shield (TS), however, no significant effect was found. Unlike single FGL STOs, the oscillation frequency changed drastically, from 38 GHz to 73 GHz, on varying the injected current density to the STO. Recording simulations showed that the signal-to-noise ratio was maximized for an STO oscillation frequencies between 34 GHz and 50 GHz, depending on the recording media used in the calculations. Therefore, the dual FGL STO may be suitable for a wide range of recording media. Alternatively, the dual FGL STO may be used for dual-layer recording, where different resonance frequencies are needed for each of the layers, obviating the need for a second STO.
Design study of FIT dataflow machine for high performance 3-D electrostatic field simulation
Authors: Wang Chenxu , Kawaguchi Hideki
Published: December 2022

To investigate portable, low power consumption, low cost and green high-performance computing (HPC) technologies which are suitable for industry applications, authors have been working on the development of dedicated computer based on dataflow architecture for electromagnetic field simulations. In this paper, we propose a Finite Integration Technique (FIT) dataflow machine based on BiCG-Stab scheme for 3-D electrostatic field simulations.