bluuebunny/crossref_metadata_2025_split huggingface dataset:
Assessment of seasonal trophic state of tropical man-made lake, The Cirata Reservoir
Authors: Ariyani M , Agustian M , Maharani G S , Sunardi  
Published: June 2019

Abstract
Evaluation of 4-year data set (2013-2016) to define the trophic state of Cirata Reservoir among the seasons and its impact on the reservoir sustainability has been performed. Cirata is one of the cascade reservoirs located on the Citarum River, with the main purpose for electricity generation through a hydropower plant. Data were obtained from eleven sampling stations of monitoring programs in the Cirata Reservoir. The technique for water sample collection and analysis referred to SNI (Indonesian National Standard) 03-7016-2004 and standard method focussing on phosphate, Chlorophyll-a and transparency. This study indicated that the trophic condition of Cirata Reservoir, as a tropical man-made, was unique and dynamic compared to lakes in the temperate season. The results showed that the reservoir water in the last four years was already eutrophic whether in rainy, intermediate or dry seasons with Trophic State Index were 60.42; 59.00 and 57.32 respectively. This study showed that the inlet and centre area of the reservoir had a higher trophic index than the outlet area. This phenomenon indicated that the main sources of eutrophication in Cirata Reservoir came from both the catchment area of the reservoir (i.e. upper Citarum) and on-site the reservoir. Phosphate has been established as the nutrient that commonly limits the productivity in Cirata reservoir. Thereby, phosphate control is critical for the eutrophication mitigation in Cirata. To cope with this condition, strategies must be applied whether to control the phosphate utilization in the catchment or inside the reservoir area.
SERS hotspots growth by mild annealing on Au film over nanospheres, a natural lithography approach
Authors: Purwidyantri A , Hsu C-H , Prabowo B A , Yang C-M , Lai C-S 
Published: June 2019

Abstract
Surface-enhanced Raman scattering (SERS) detection is a remarkably powerful optical sensing platform employing electromagnetic field amplification in hotspots area produced by nanoparticles. In this study, natural lithography was performed where a 5 nm Au was evaporated on an ITO substrate covered by periodic polystyrene (PS) nanospheres (d = 100 nm), called as Au Film over Nanospheres (AuFoN). The substrates went through a rapid thermal annealing (RTA) at 150°C. This temperature was preferred to maintain PS nanospheres from total structural damage while variance in RTA duration at 1, 3 and 5 minutes were applied to investigate the SERS output signal on the treated surfaces. A scanning electron microscopy (SEM) characterization shows the morphological changes of the substrate along with longer RTA duration. Up to 5 minutes of RTA, the periodic trace of PS nanospheres is well-preserved. Based on the atomic force microscope (AFM) screening, the longer RTA process produced higher surface roughness and generated more SERS hotspots. The maximum enhancement factor of SERS signal was obtained by 5 minutes RTA treatment given by the value of 3.16 x 103. The strong electromagnetic field was shown to be around the spherical line of the nanospheres according to the Finite-Difference Time-Domain method (FDTD) computation.
Study on Synthesis Stiffness of Inner Supported Deep Excavation in Soft Soil Area
Authors: Hu Zhifeng , Chen Jian , Hu Xiwei 
Published: June 2019

Abstract
The horizontal displacement of retaining structure is particularly associated with synthesis stiffness of support system. The synthesis stiffness of support system is highly interrelated with three parts including the retaining wall, the inner brace and the soil at bottom of excavation. In order to estimate the lateral movement of retaining wall, a synthesis stiffness formula is been proposed. The proposed model concludes a variety of factors, such as horizontal flexural rigidity of retaining wall, compressional stiffness of inner brace, average vertical support spacing, average horizontal support spacing, depth of wall penetration and stiffness of the soil below final excavation depth. Comparing with the Clough synthesis stiffness, more factors is been considered. Comparing with the MVSS synthesis stiffness, the factor of soil below final excavation is been defined exactly. After that, finite element method is employed to calculate the maximal lateral displacement of the retaining wall. And a good relationship is established between maximal horizontal displacement and synthesis stiffness formula. Finally, the calculations are used to compare with the observed data from several deep excavations, the result validates the applicability of proposed model. The research provides a new method for describing the comprehensive stiffness of support system of foundation pit. It is convenient to estimate the maximum horizontal displacement of the retaining structure at the design stage and to select the support system quickly.
Effect of Different Electrode Numbers on the Image Quality of Concrete Damage in Electrical Resistance Tomography
Authors: Sun Shidong , Qin Lei , Ren Hongwei 
Published: June 2019

Abstract
Electrical resistance tomography (ERT) method [1] is proposed to visually investigated of the defect in concrete. It is an imaging modality in which the electrical permittivity distribution within an object is reconstructed based on measured resistance between electrodes attached on the object’s surface. It is assumed that the spatial resolution of the reconstructed images with an electrical resistance tomography system can be consummated by electrodes. In this paper, specimens with one precast defect are made with 0.5 water-cement (w/c) ratio and detected using the embedded electrodes. The results show that different electrode numbers is the significant factor influencing the image quality of concrete damage in electrical resistance tomography. For the multi-defect detecting, the influence of electrical soft field effect cannot be neglected. In addition, the experimental results also show that ERT technology has the potential of concrete defect detection and on-site monitoring.
Experimental Research on Precursory Characteristics of Macroscopic Deformation of Coal and Rock Failure
Authors: Xu J. K. , Xi D. Y. , Zhou R. 
Published: June 2019

Abstract
The research on precursory characteristics of coal and rock failure is of great significance for monitoring and early warning of disaster of surrounding rock. In this paper, the macroscopic deformation process of coal and rock under uniaxial compression is tested, and the evolution rule of the quantity, velocity and acceleration of their deformation is studied. The relationship between specimen surface damage and macroscopic deformation is investigated by image processing and analysis method. The research indicates that the macroscopic deformation indexes of coal and rock failure zones have significant changes before cracking, showing regular dynamic deformation characteristics, which could be precursory information of coal and rock failure.
Elastic Buckling Behavior of Thin Plate with Circle Holes under Axial Compression
Authors: Yao Xingyou , Li Xiao , Guo Yanli 
Published: June 2019

Abstract
The stability of members will be affected because the stress concentration resulted from the holes in thin plates. Elastic buckling performance of the perforated circle plate under axial compression is analyzed using a general finite element software ABAQUS in this paper. Results show that the buckling stability coefficient of plate is significantly low when the hole locates at the short side of the plates. The buckling stability coefficient of plate will decrease with the increase of the dimension of holes when the hole size is less than a certain value. The buckling mode of plates will change because of the dimension of holes. Finally recommended calculate formula of buckling stability factor k of perforated circle plate under axial compression is presented based on parameter analyse.
Rock Burst Classification Prediction Method Based on Weight Inverse Analysis Cloud Model
Authors: Yu Junchao , Liu Shangge , Gao Ling 
Published: June 2019

Abstract
A cloud model comprehensive evaluation method based on weight inverse analysis is proposed and applied to the prediction of rock burst grade. At first, the objective function with weight as independent variable is derived and established. The objective weight of each evaluation factor is obtained by genetic algorithm. Then the concrete steps of the coupling of weight inverse analysis and cloud model are given. After that, σθ/σc σc/σt
and Wet are selected as the evaluation factors. σθ/σc
is the ratio of the maximum tangential stress in the cavern to the compressive strength of rock. σc/σt
is the ratio of tensile strength to the compressive strength of rock. Wet is the elastic energy index. According to the rock burst engineering example, the inverse analysis and calculation of the factor weights are carried out. Finally, this method is applied to the rock burst grade prediction of Jiangbian Hydropower Station and Maluping Mine. Compared with the cloud model prediction results of other weighting methods, its feasibility and effectiveness has been verified. The research shows that the cloud model for rock burst based on weighted inverse analysis is less subjective in the weighting process and the prediction effect is better.
Fatigue Damage of RC Beams Subjected to Low Level of Fatigue Loading
Authors: Wang Shuai , Wu Jieqiong , Ye Yinghua 
Published: June 2019

Abstract
The fatigue damage of reinforced concrete (RC) beam specimens subjected to low load level with the upper limit of 0.3Pu, 0.4Pu or 0.5Pu and the lower limit of 0.06Pu were experimentally studied, where Pu was the static ultimate strength of the RC beams. Based on the testing results of concrete strain and mid-span deflection, the effects of load level and fatigue cycle on the accumulation of fatigue damage were discussed. Results show that, the concrete strain, mid-span deflection and residual deflection would undergo a rapid increase followed by a stable change and they all increase as the upper limit or fatigue cycle increased, which indicated that the fatigue damage accumulated as the upper limit or fatigue cycle increased. The steady develop range of concrete strain and deflection became narrow as the upper limit of fatigue load increased to 0.5Pu. Besides, the residual deformation of RC beam specimens showed the boundary of fatigue cycles for steady development was 0.1 million for all load levels of 0.3, 0.4 and 0.5.
Instability Criterion for Surrounding Rock of Water-Rich Roadway in Sandy-Gravel Stratum Based on Catastrophe Theory
Authors: Yuan Yue , Fu Jinlei , Qin Jian , Wang Xiaokang , Wang Bensheng 
Published: June 2019

Abstract
In order to solve the problem of instability discrimination for water-rich roadway in sandy-gravel stratum, taking the displacement function and damaged area function as potential functions of the roadway surrounding rock system based on catastrophe theory, the instability criterions of the roadway in sandy-gravel stratum under seepage were established, i.e. the criterion for extremal modulus of displacement and criterion for the damaged area. Then the specific process for stability discrimination was further proposed. A PFC2D numerical model for a shaft bottom roadway in a large coal mine in Xinjiang was established. The calculation results show that as seepage pressure increases, modulus of displacement and damaged area in surrounding rock present irregular fluctuations and similar change rule. In the latter stage of the increase of seepage pressure, the deformation and damage of the roadway all have experienced a sharp sudden raise. And the conclusion of instability discrimination obtained from the calculation results of catastrophic eigenvalues for modulus of displacement and damaged area are consistent with damage evolution and instability process of the surrounding rock, which verifies the feasibility and applicability of the instability criterions.
Structural Design of the Waterway Regulation Project of Dongbei Waterway in the Lower Reaches of Yangtze River
Authors: Liu Pengfei , Wang Ning , Lei Xueting 
Published: June 2019

Abstract
In view of the navigation problem of Dongbei Waterway in the lower reaches of the Yangtze River, the evolution of riverbed and the characteristics of the obstacles are analyzed. The engineering layout scheme is determined by various methods such as model test. In the design of engineering structure, the geological conditions of the project area are analyzed through geological exploration. The applicable engineering structure form is determining, the advanced and mature bank protection and beach protection structure is adopted in the regulation of the Yangtze River channel, and the optimized structural design is adopted to strengthen the stability of project and deal with problems such as geology and strong erosion. The environmental design material and the green structure type are adopted in the structural design to meet the ecological benefits of the project, which can provide reference for the engineering design of similar channel improvement project.
Study of Mountainous Long Span Prestressed Concrete Box-Girder Bridge Cantilever Construction Safety Monitoring System Based on Multi-Agent System
Authors: Wang Qin , Liu Qiuxin 
Published: June 2019

Abstract
Mountainous long span prestressed concrete box-girder bridge cantilever construction has too many risk factors, and it is difficult to control the construction safety. To ensure the construction safety of Xi-jun bridge, a mountainous long span prestressed concrete box-girder bridge cantilever construction safety monitoring system based on Multi-Agent System is built in this paper. To make full use of cooperativity and interaction of Agent, there are six kinds of Agent in MAS construction safety monitoring system model framework. The monitoring system is built based on. NET Framework. The communication mechanisms of Agent are built based on WinSocket. Then the automatic updating of finite element analysis model is achieved, and the analysis and forecast of box-girder bridge cantilever construction safety state can be done in the system. The safe sate of Xi-jun bridge construction is always be in controlled by use of the system.
Study on Elastic-Plastic Performance Analysis of a Prefabricated Low Multi-Story Villa
Authors: Xie Jun , Jiang Difei , Bao Zhentai 
Published: June 2019

Abstract
Calculate the joint connection spring rigidity of prefabricated low multi-story villa according to relevant specification and take modeling analysis by using SAP2000 finite element analysis software. Respectively analyze elastic-plastic time-history under moderate earthquakes and major earthquakes, take checking calculation of structural safety and obtain the conclusion and support the project to complete smoothly so as to provide design basis for this kind of multi-story prefabricatedvilla.
Impact Localization of Thin Plate Structures Using Pzt-Array Based Passive Wave Method
Authors: Yan S. , Li B.W. 
Published: June 2019

Abstract
Impact of foreign objects is one of the main reasons for the damage of thin plate structures, resulting in property losses or unexpected accidents. Therefore, a rapid and effective impact localization of thin plate structures is of great value. In this paper, a localization method is proposed based on the passive wave method, aiming at locating the impact quickly and accurately. First, a square PZT array composed of 4 PZT sensors was designed, and a hyperbolic localization algorithm was derived according to time-different of arrival (TDoA) for different sensors in the array. Then, Matlab calculation software was used to perform DB wavelet decomposition on impact signals, the time delay was calculated by Lamb wave of A0 mode in D5 detail signals, and the velocity of A0 mode wave was determined by the dispersion curve for 1 mm thick aluminum plate. Finally, the impact point was located to experimentally verify the effectiveness of the proposed localization method. Experimental results show that the hyperbolic positioning algorithm based on TDoA can accurately identify impact locations, and wavelet decomposition can effectively identify single mode Lamb waves. The proposed method has the characteristics of fastness and accuracy, which is suitable for single object impact localization on thin plate structures.
Study on Construction Method of High-Voltage Transmission Tower Beneath Shallow-Buried Tunnel
Authors: Xuan Junjie , Yan Songhong , Zhao Tianming 
Published: June 2019

Abstract
Wangqiao tunnel of Jiu-jing-qu railway is used as engineering example, based on risk analysis, aim at the construction scheme, comprehensive analysis and calculation has carried on combined monitoring and numerical analysis. Reliability demonstration has conducted on comprehensive construction scheme of” ground surface grunting consolidation & mechanical excavation & improving support measure & settlement monitoring”. Practice has proved that the deformation of the tunnel’s settlement of the arch and the high-voltage transmission tower were in allowable ranges, and good economic and technical results are obtained, the results can provide a reference for similar projects.
Study on Static Risk Assessment Model of Expressway Operation Companies
Authors: Zhang Xiaofeng , Lv Lianghai , Xu Yabo 
Published: June 2019

Abstract
In order to achieve that the expressway operation companies may manage itself by different levels, and avoid accidents effectively, establishing a risk assessment model for static risk sources is necessary. First, according to the result of surveying, the risk source units of expressway operation enterprises was divided, and the risk sources of each unit were identified. The list of risk sources was established. At the same time, the types of accidents that may be caused by all risk sources were analyzed. Secondly, according to the principles of practical operability and effectiveness, and the relevant laws and regulations of the state on accident grading, criteria for evaluating the severity of accidents and consequences was set up. Finally, the risk matrix for risk level determination of the risk source of the expressway operation enterprise was set up.
Effectiveness Evaluation of quality Management System in Construction Engineering Testing Laboratory Based on Triangle Fuzzy Analytic Hierarchy Process
Authors: Du Dandan , Song Xiaosheng 
Published: June 2019

Abstract
At present, there are few evaluations on the effectiveness of the quality management system of the construction engineering testing laboratory in our country. According to the quality management system of the quality management system, a two-stage evaluation structure model of the quality management system effectiveness is established according to the Evaluation criteria for the qualification of the Laboratory. A comprehensive evaluation of the quality management system of a building engineering testing laboratory in Tangshan City was carried out by using triangular fuzzy number analytic hierarchy process (AHP), and the evaluation results were obtained in accordance with the actual situation.
Design and Numerical Simulation of Displacement Sensor Based on Helix Antenna
Authors: Yi Zhuoran , Xue Songtao , Xie Liyu 
Published: June 2019

Abstract
This paper provides a new design of passive wireless displacement sensor. The sensor consists of an external helix antenna and an internal aluminum oxide rod. According to the perturbation theory, there is an approximate linear relationship between the displacement of aluminum oxide rod in the cavity and the resonant frequency of the helix antenna. Due to the structure of the sensor, it can be easily refitted into a maximum displacement sensor. In this paper, numerical analysis and parameter optimization are carried out through High Frequency Structure Simulator (HFSS). The final optimization results show that the sensor has good linearity and sensitivity within the determined range.
The role of dopant segregation on the oxygen vacancy distribution and oxygen diffusion in CeO2 grain boundaries *
Authors: Symington Adam R , Molinari Marco , Statham Joel , Wu Ji , Parker Stephen C 
Published: June 2019

Abstract
An important challenge when attempting to identify the role of microstructure on the properties of doped energy materials is to distinguish the behaviour of each grain boundary. In this paper we describe our recent work using atomistic simulations to investigate the structure, composition and oxygen transport of gadolinium doped cerium dioxide tilt grain boundaries. We find that energy minimisation can be systematically employed to screen grain boundary structures and dopant segregation. When dopants are distributed equally across grains, molecular dynamics simulations reveal oxygen vacancies reside near dopants, resulting in higher oxygen diffusivity. Once the dopants accumulate at the grain boundaries these grain boundaries become saturated with oxygen vacancies. We see fast oxygen diffusion within the grain boundary plane, although the depletion layer, as shown via the electrostatic potential appears to block transport across the grain boundary. However, this is highly dependent on the grain boundary structure as we find striking differences of the electrostatic potential and the segregation behaviour between each of interface studied.
Multilingualism, Multiculturalism, and Migration: A Critical Assessment
Authors: Cisneros Josue David 
Published: June 2019

AbstractThis essay-review assesses what has been dubbed a hybrid or mobile turn in work on immigration, literature, and language. Analogous to a broader mobility turn in studies of migration, scholars in literature and linguistics emphasize the fluidity, hybridity, and mobility of migrants’ (multi-)lingual practices and literatures, aiming to challenge sedimented ideas about linguistic assimilation or nationalism and monolingualism. While finding merit in these works, this essay argues that celebrations of migrant multilingualism and linguistic hybridity also can work in tandem with the racialization, economic exploitation, and exclusion of migrants. This is because certain forms of migrant multilingualism become forms of human capital under neoliberalism, while other forms of linguistic diversity or fluidity are, at best, made illegible or, at worst, used to racialize otherwise ideal neoliberal migrant subjects. Tracing how arguments for linguistic fluidity and hybridity are folded into complex and stratified forms of neoliberal subjectivity, multiculturalism, and economic value, the essay illustrates the necessity of situating studies of immigrant language practices and language policy within broader political, economic and world-historical contexts such as global racial capitalism.