bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Variation Law of Back-Calculation Modulus of Asphalt Pavement Layer
Authors: Guo Licheng , Zeng Guodong , Yan Xiangpeng , Wu Wenjuan , Wei Jincheng
Published: March 2020

Based on in-situ FWD testing and laboratory dynamic modulus test, the influence of loading level, position and pavement temperature on FWD back calculated modulus and the relation between bacalculated modulus and dynamic modulus was analysed. The structure combination of asphalt layer was determined based on pavement temperature profile and the composite modulus was calculated based on laboratory modulus test and in-situ measured pavement temperature. The results show that loading level had little influence on bacalculated modulus and testing position had much more influence on bacalculated modulus than loading level. The backalculated modulus and composite modulus decreased with temperature increase, when temperature was low backalculated modulus was greater than composite modulus, when temperature was in room temperature backalculated modulus was equal to composite modulus and when temperature was high backalculated modulus was less than composite modulus. For relation between bacalculation modulus and temperature, temperature correction coefficient for bacalculation modulus was developed and for relation between backcalculation modulus and composite dynamic modulus, correction coefficient model between them was developed.
Risk Analysis of a Railway Station in Shenyang with Cover Excavation and Top-Down Method
Authors: Wang Fengchi , Chen Jiaxi , Wen Yizhen
Published: March 2020

In this paper, for the water-rich sandy soil layer, ABAQUS finite element software is used to simulate the actual engineering background and the impact of different construction stages on different risk terms. The results shown that the settlement curve shows a large amount of soil settlement near the foundation pit, far the tendency of the settlement of the soil at the foundation pit is smaller; during the construction process, the vertical stress distribution of the entire soil changes; as the excavation depth of the subway station gradually increases, the settlement of the hotel increases accordingly, and The amount of settlement near the station side is always greater than that far from the station side; the force form of the ground connecting wall is consistent with the simplified diagram of the equivalent beam theory. And as the excavation depth of the foundation pit increases, the position of the earth pressure zero point gradually decreases.
Application Research of BIM Technology in Subway Power Supply and Distribution Construction
Authors: Dang JiaoTe , Zou Chao
Published: March 2020

In recent years, with the great attention and vigorous promotion of BIM technology in relevant departments, the application and research of BIM technology has brought huge economic benefits to the development of the construction industry in China. Even so, the application of BIM technology in the field of urban rail construction is still in the exploration stage. Taking “X subway station” as an example, through the analysis of the difficulties in power supply and distribution construction and the surrounding environment of subway stations, fully integrates the advantages of BIM technology, including 3D visualization, construction simulation, work coordination and information sharing. This paper puts forward the application of BIM technology in power supply and distribution equipment hoisting, cable laying, parametric design of family components, visual construction guidance and information management. Through the BIM technology of information management, the smart construction and lean management of urban subway construction can be realized, thus verifying the good application value and development prospect of BIM technology in subway power supply and distribution construction.
Analysis on the Parameter of Transition Section of Metro Trapezoidal Sleeper Track
Authors: Zhang Shenglong , Liu Li , Wang Wenbin , Li Yulu , Wei Zhiheng , Zhou Yongzhi
Published: March 2020

The length of transition section of Metro trapezoidal sleeper track bed affects the overall stiffness of the track. This paper establishes the Metro vehicle-rail coupling model and compares the calculated results of the trapezoidal sleepers of different transition lengths with the field measured data to verify the correctness of the model. The calculation results show that: The maximum vertical displacement of the track bed at the length of 0, 3, 6, and 9 meters is 2.55, 2.53, 2.01, and 1.92 mm, respectively, the maximum vertical displacements of the transition rails at the length of 0, 3, 6, and 9 meters are 2.53, 2.44, 2.31, 2.30 mm, respectively, the maximum rotation angles of the 0, 3, 6, and 9 meters transition sections are 1.01 rad ‰, 0.96 rad ‰, 0.90 rad ‰, 0.84 rad ‰, respectively. Considering the safety of the track and other factors, the length of the trapezoidal sleeper transition section should not be less than 9m.
Study on Vibration Isolation Effect of Periodic Pile Arrangement on Subway Ground
Authors: Zhang Shenglong , Wang Wenbin , Wu Zongzhen , Dai Yuanting , Li Yang , Zhou Anguo
Published: March 2020

For the environmental vibration caused by urban rail transit, this paper proposed a new type of periodic vibration isolation pile as the path vibration isolation measure. The finite element model is used to analyze the vibration damping performance of the periodic pile under the impact of the subway ground source. The measured vibration source strength is used as the excitation input to study the effects of different buried depths and different numbers of rows on the damping effect of the piles. The calculation results show that under the impact of the subway vibration source, the maximum Z-magnitude of the free-field vibration increases exponentially with the increase of the distance; the optimal arrangement of the periodic vibration isolation piles is: pile length: 14 m, number of rows: 3 and arranged close to the vibration source; the vibration damping effect is more than 5 dB within 15 m behind the pile.
Simulation Analysis of Mechanical Behavior during Treatment Construction of Tunnel Collapse
Authors: Zhu Junxun , Song Xie , Li Yuanxiang
Published: March 2020

Combined with Shenjiashan tunnel collapse accident in Guanggan highway, the paper analyzes the construction simulate the mechanical behavior of rock collapse segment caused stress field, displacement field and variation of the plastic zone calculated by FLAC3D numerical software. The conclusions are as follows: (1) The maximum tensile stress occurs in the vault 60°range and the central backplane while the maximum compressive stress occurs in the middle part of the foot of the tunnel arch; (2) Vault subsidence maximum displacement is mainly distributed in the range of 60°vault, floor uplift maximum displacement is mainly distributed in the 1/3 of the central bottom. (3) As the excavation proceeds, the central cavity collapse begins to appear plastic zone (tensile yield based), the arch plastic zone (shear yield based) significantly increase the scope and depth of rock to develop. If unchecked, the arch part of shear failure may occur. The results show that the support system of advance pipe shed support +cavity grouting reinforcement + steel arch played an active role in the collapse of governance throughout the process, and the foot of the tunnel arch and vault 60°range are the focus of the site in support of this collapse treatment construction.
Tunnel Design for Suzhou 3rd Metro Line across Jinji Lake
Authors: Zhang Sijiang , Wang Shijun , Li Wei , Wang Jun , Chen Yuhong
Published: March 2020

This article aims to make a preliminary design for the tunnel of Suzhou Metro Line 3 crossing the Jinji Lake. It describes the key factors to consider. First, select the appropriate route and the model of the shield machine for the specific geological conditions, and then analyze the tunnel dimension, concrete segmental linin and so on. Calculate the earth pressure, water pressure and analyze the stability of the excavation face. Finally, this article deals with the problems in the construction process and corresponding solutions.
Analysis of Supporting Mechanism of Steel Arch Frame in Tunnel Collapse
Authors: Song Xie , Zhu Junxun
Published: March 2020

As the steel arch can withstand the rock load immediately, this is widely used in tunnel collapse treatment. Firstly, the steel arch mechanism and mechanical model in tunnel collapse supporting had been studied. Then the modeling points and solutions of the finite difference software FLAC3D were pointed out, and the effects of steel arches and steel arches with different spacings were simulated. This paper analyzed the stress field of rock, displacement field of rock and stress behavior of steel in different conditions, the following conclusions: (a) Steel arch can inhibit stress concentration of the foot arch, while the dome appears to reduce the scope of the low stress areas, and it can effectively inhibit the vertical displacement of the vault and floor; (b) The maximum axial force and bending moment were increased with the increase in the arch steel arch spacing; (c) The maximum axial force steel arch occurs mainly at the crown, while the maximum bending moment occurs mainly in the arch and vault at the waist, and arch at the moment was very small. There were basically consistent with the mechanics calculations.
Comparative Analysis of the Influence of Building Vibration on Human Comfort Caused by Blasting and Subway Train Loads
Authors: Xiong Yilei , Zhang Shenglong , Wu Zongzhen , Wang Wenbin , An Zilong , Wei Zhiheng
Published: March 2020

In order to compare the difference between impact of the building vibration on human comfort caused by blasting and subway train load, the finite element model is established and two kinds of excitations are applied to analyze and evaluate the dynamic response of building structure under two working conditions. The research results show that the building vibration caused by train load has a long duration and relatively low vibration amplitude; the building vibration caused by blasting load has a short duration and relatively high vibration amplitude. Both vibrational energies exceed the standard limits and have adverse effects on residents from the perspective of sustainability and impact.
Numerical Study on Comparison and Selection of Water Tunnel Section Types
Authors: Liu Qi , Zhi Chengjie , Yan Tianyou
Published: March 2020

In order to study the mechanical deformation response law and stability difference of surrounding rock induced by the unloading effects of tunnel excavation with different section types, the 3D numerical tunnelling simulation was conducted. The results show that the plastic zone depth and deformation value of the surrounding rock of the circular tunnel are the smallest, and its stress distribution is uniform. The plastic zone depth and volume of the surrounding rock of the horseshoe-section tunnel are slightly larger, the rock deformation is about 10% larger than that of the former, and its stress distribution is relatively uniform. However, the plastic zone depth of the surrounding rock of the gate-section tunnel is 0.7-1.2m larger than that of the circular tunnel, and plastic zone volume increases by about 28.5%. Meanwhile, the surrounding rock deformations at the sidewall and floor of the gate-section tunnel are larger, and its deformation gradient is higher. The stress concentration phenomenon at the intersection of the floor and the sidewall is also significant. Therefore, the surrounding rock stability of gate-section tunnel is considered to be most unfavourable among the three tunnel section types. In consideration of tunnel stability, construction difficulty and economy, the horseshoe section type is recommended.
Construction Monitoring and Numerical Simulation of Water-Rich Tuff Soft Rock Tunnel
Authors: Chen Fangliang , Zeng Kaihua , Li Xuejun , Xu Manqing , Dai Hongtao
Published: March 2020

With the rapid development of China’s high-speed railway construction, many difficulties have been encountered, and many difficulties and challenges have been encountered. Usually, there are safety accidents such as excessive deformation of the surrounding rock that causes serious intrusion, and even serious flooding, which not only restricts the construction period, Caused significant economic losses. The main reasons for these problems are insufficient understanding of the deformation mechanism of tunnel surrounding rocks, especially water-rich soft rock tunnels, and the lack of targeted control measures. This article takes the widely distributed tuffs in Zhejiang as an example. The tunnel deformation monitoring and measurement work can be used to grasp the dynamic evolution law of the surrounding rock. After the tunnel is excavated, the surrounding clearance of the surrounding rock and the settlement of the vault are determined. The key basis of process accuracy, the monitoring results are used to guide the next stage of construction and predict the deformation law of the surrounding rock in front of the palm face. At the same time, a finite element numerical model is established based on the surrounding rock structure of the tunnel to analyze the displacement and stress changes of the surrounding rock during the tunnel excavation process.
Study on the Scheme of Sensor Arrangement in Pseudo Static Test for Immersed Tunnel Joint
Authors: Cheng Xinjun , Xu Kunpeng , Liang Haian
Published: March 2020

The arrangement scheme of the sensors in a pseudo static test for an immersed tunnel joint was revealed in this paper. To achieve this target, the pushover analysis of the two immersion joint models were studied by using numerical calculation. The mechanical characteristics of the immersed tunnel joint under horizontal loading condition were carefully observed. According to the numerical results, shear keys and connecting part in tunnel elements are the key observation sections, the stress development, the shear capacity and the deformation features of the immersion joint should be measured. Furthermore, a loading system of pseudo static test for immersion joint is also developed. Based on the loading system and numerical funding, the locations for deploying sensors were determined. The scheme of sensor positions played a crucial role in guaranteeing the successful completement of the experiment, and also can offer some reference opinions for similar experiments.
Study on Propagation Characteristics of Seismic Wave in Rock Tunnel Excavation Blasting
Authors: Hao Xiaoping , Xu Yushan , Liu Hongshun
Published: March 2020

Based on the excavation of rock tunnel in Da’anshan coal mine, the paper carried out the vibration monitoring on blasting excavation is carried out in the rock tunnel. Through analyzing the time and frequency of the monitored blasting seismic wave by HHT transformation, the energy distributions of blasting vibration characteristics and seismic wave are obtained, which provides a strong basis for the establishment of rock absorption measures and safe excavation in rock tunnels.
Theoretical Analysis of Bearing Capacity for Shield Tunnel Reinforcement Structure
Authors: She Caigao , Zhang Bolin , Zheng Jun , Li Xiaoxin
Published: March 2020

Aimed at the bearing capacity of shield tunnel reinforcement structure, this paper conducts a series of research and theoretical derivations. First of all, the reinforced composite structure must meet some basic assumptions before any theoretical analyses. With the secondary stress analyses of the structure, the calculation method of the lag strain is derived. Adding this lag strain to the overall reinforced structure can make the strain of the whole section meet the plane hypothesis, and the overall structure can be analyzed from the strain diagram considering the lag strain. And then whether the steel bar and reinforced structure yield or not and their yielding sequence can give the shield tunnel reinforcement structure four typical failure modes under the ultimate limit state, according to which theoretical formula of the ultimate bearing capacity of various reinforced composite structure in different failure modes can be derived. At last, the result can be used to analyze the structure’s ultimate bearing capacity and convergence deformation.
Study on Excavation Disturbance Characteristics of High Ground Stress Soft Rock Tunnels
Authors: Li Jianhe , Yian Tianyou , Liu Qi
Published: March 2020

Based on the Xianglushan tunnel in The Central Yunnan Water Diversion Project, the stress, deformation, damage range and supporting structure bearing characteristics of the surrounding rock of the tunnel under different initial stress field are studied. It is shown that the stress, deformation, rupture range and supporting structure load of the surrounding rock are characterized by zonal distribution after tunnel excavation. The maximum principal stress transfer profile and deformation profile of the surrounding rock are basically perpendicular, and the deformation at the location of high stress concentration is small, while the deformation in the unloading zone is large. For the system anchor, the axial force of the anchor in the stress concentration zone is relatively small, and the axial force of the anchor in the unloading zone is relatively large. Therefore, according to the bearing characteristics of the supporting structure, the surrounding rock of the tunnel can be divided into different zones for different support. The related understanding and conclusions are of certain theoretical and engineering significance.
Classification Method of Small Reservoir in China Based on Risk Analysis
Authors: Zhou Yonghong , Bian Xiaoqing , Chen Yunping , Fang Weihua
Published: March 2020

In order to effectively manage more than 90000 small reservoirs in China, aiming at their characteristics, based on risk analysis, this article established a small reservoir dynamic risk Classification method and corresponding indexes including Safety risks factors and connecting with current specifications. in terms of the safety risk factors such as occurrence environment, structural materials, supervision and management, and accident loss. It solved the standardization and pertinence problems of small reservoir risk management in China.
Study on Water Damage Mechanism and Emergency Restore of Fill Subgrade upon Squashy Slope Foundation in Mountain Area
Authors: Zeng Yao , Wang Qi , Cao Jun , Liu Gang
Published: March 2020

This thesis takes the typical fill subgrade of squashy slope foundation of Qinglong-Xingyi Expressway in Guizhou Province as an example. Through engineering geological analysis, it was found that the topography and geomorphology conditions, formation lithology conditions and highway construction conditions were the basic conditions of water damage to highway subgrade, and hydrometeorological conditions are the direct cause of water damage of highway. Coupling calculation analysis using SEEP/W and SLOPE/W revealed the mechanism of short-term continuous heavy rainfall. When the short-term continuous heavy rainfall reached a certain level, the soil at the geotechnical interface reached saturation. At this time, the surge of pore water pressure at the geotechnical interface led to the sudden drop of effective stress, leading to the sudden decline of side slope stability, which was the starting condition for the formation of landslide caused by the water damage to subgrade. The implementation of emergency restore and the effect evaluation indicated that comprehensive treatment measures of the anti-sliding support combined with integrated drainage should be adopted for the prevention and control of the water damage to the subgrade. Underground drainage measures could effectively drain groundwater, playing a role in reducing groundwater level and pore water pressure in slip soil.
Study on Terrain Profile and River Incision Based on Buffer Grid
Authors: Sun Jiaqi , Tian Shufang
Published: March 2020

This paper proposed a new method for analyzing terrain profiles and river incisions. We used the buffer grids to determine the profiles. We selected Xianshuihe Basin as the study area. First, we performed a focus analysis on the buffer grid of the watershed, and determined the surface peaks and valley points. Then, we generated the peak line profile and valley line profile. Finally, we quantitatively calculated the depth of river incision based on the height difference between the two profiles. The result shows that the buffer grids can help us accurately analyze the terrain profiles and the river incisions. The incision depth of the river has a linear relationship with the ridge height of the marginal zone. Our research shows that the higher the surface uplift, the deeper the river incises.
Comparison Research on Modal Parameters Identification of Measured Vibration Response Signals of an Offshore Substation Platform
Authors: Chen Jiefeng , Sun Zhenzhou , Yuan Jianping , Jin Bo
Published: March 2020

It is difficult to simulate and forecast the operation and security of offshore substation platform in service through a numerical model. Based on the vibrational response signals measuring from offshore substation platform, one can monitor the real-time state of offshore substation platform after obtaining its modal parameters via automatic ERA and SSI modal identification methods. Considering the sophisticated composition of environmental loads, and vast quantities of data, it is hard to use the ERA and SSI method to procure the modal parameters of substation platforms directly. Therefore, the automatic modal parameter identification method, which can cope with these severe conditions at sea, is introduced for the sake of obtaining the frequency and damping of offshore substation platform. The results indicate that: by making a comparison between the modal parameters in the design stage and those in operational states, the method proposed in this paper can identify the frequency and damping of the offshore substation platform accurately. Consequently, it comes the conclusion that the security of the offshore substation platform is still safe. Anyway, the method proposed in this paper furnish designers with a new way to forecast the states of structures and improve their designs.
Study on Reservoir Optimal Operation in Heavy Sediment-laden Rivers
Authors: Xu Zhifeng , Huang Jianhong , Zhang Youli
Published: March 2020

The rivers in northern China have less water and more sediment, and the amount of incoming sediment is mainly concentrated in the flood season. In order to reduce the sediment deposition in reservoirs, study on reservoir optimized operation needs to be carried out. Traditional reservoir operation usually adopts a single normal pool level and a single flood control level, which does not take into account changes of the reservoir storage capacity with time. Due to the large capacity of the reservoir in the early stage of operation, the lower normal pool level can also meet the water supply demand. Therefore, it is possible to reduce the normal pool level and the flood control level. Reservoir capacity decreases in the later stages of reservoir operation. Increasing the normal pool level and the flood control level can increase the storage capacity. This paper uses a mathematical model to simulate the remaining capacity of the reservoir under different control operating levels. The results show that scheme 4 has the best results.
Numerical Simulation of Red Soil Water Infiltration under Bubbled Irrigation Condition
Authors: Zhao Xinyu , Wu Rongqing , Yang Yanfen
Published: March 2020

Based on the indoor bubbled irrigation experiment, the mathematical model of soil water infiltration is established according to the movement theory of unsaturated soil water, and it is solved by the software of HYDRUS-3D. The relative error between the simulated value and the measured value of soil water content is small, and the two values have good consistency, so the model can be used to simulate the red soil water infiltration under bubbled irrigation condition with HYDRUS-3D. The simulation result shows that the characteristic value of soil water movement increases with the increase of flow rate, and its latitude decreases with the time, the inflow is directly proportional to the migration speed of wetting front and the increase rate of soil moisture content, the relationship between soil water content and infiltration flow is equal proportion when the infiltration is stable.
Physical and Mechanical Properties of Grass-Planting Concrete for River Revetment Projects
Authors: Xia Qing , Jiang Hui , Wang Jinhui , Liu Yao , Cui Lijin
Published: March 2020

As an ecological material, Grass-planting concrete has been increasingly used in constructing bank revetment of the rivers, and the studies on the physical and mechanical properties of the concrete is key for more efficient application. This paper describes the physical and mechanical properties of the concrete through analyzing the relationship among cementitious materials, dry bulk density, compressive strength and porosity. The results indicated the grass-planting concrete could meet the requirements for the strength and plant growth of ecological bank protection of small and medium-sized rivers when the total amount of cementitious materials was greater than 526 kg/m3 or the dry bulk density was greater than 1700 kg/m3. There is a negative correlation between the compressive strength and the porosity. This work provides excellent technical support for the popularization and application of grass-planting concrete.
A Review on the Grouting Piles with High Pressures Used for Pollution Reduction
Authors: Liang Yantao , Wang Shijun , Wei Jianmin , Han Jianfeng , Wang Quan
Published: March 2020

Traditional bored drilling piles were often used in geotechnical engineering. However, its construction process is complicated, and the stability of the treated site and the bearing capacity of piles are unexpected. Importantly, the slurry produced in the construction process will cause the environmental pollution. This paper introduced the construction process, quality evaluation and bearing capacity calculation of a high-pressure grouting pile. In addition, this paper looked forward the application of the polymer materials and high strength concrete grouting piles for pollution reduction in power transmission and transformation engineer.
Research on Automatic Monitoring and Early Warning System Based on BIM Smart Infrastructure Risk
Authors: Du Changqing , Bing Bo , Mao Xintong , Liu Wei , Liu Yinying , Xu Qi
Published: March 2020

Aiming at the project of Jiangsu Zhongwu 500 kV substation, the finite element analysis of scaffolding engineering is carried out and the scaffolding construction monitoring platform based on BIM technology is established by using BIM technology to realize visual monitoring of scaffolding and the field monitoring data is processed and displayed in the form of chart, which provides the basis for scaffolding construction safety.
Application of Least-Squares Method to Time Series Analysis for 4DPM Matrix
Authors: Dong Mingwang , Huang Linfu , Wu Xueqin , Zeng Qingguang
Published: March 2020

In the past 10 years, considerable attention has been paid to PMBOKM, and it has combined with specific examples. However, quantitative methods are rarely used for analysis. We select Han River Estuary Waterway Engineering Project as a study case. Based on the relationship between the stages of the project management system, it tries to analyse the first five stages of matrix time series of 4DPM in the three major forms by the least squares method, and the method is divided into four steps to solve the matrix. In addition, the matrix is subject to function changes and transpose processing, and then solved by the least squares method too. According to the set solution method, the matrix can be solved, and eight cases can be obtained. By comparing the errors, under the condition of transposed matrix, the function of the most suitable for matrix transmission can be found. So, it is known that the method is feasible and effective in 4DPM model matrix analysis.
Research on Building Supply Chain Collaboration Model Based on BIM and Internet of Things Technology and Its Application
Authors: Zhao Likun , Tian Zhipeng , Yang Yaqin
Published: March 2020

The integration of BIM model and Internet of Things (IOT) technology will be more helpful to achieve the coordination and optimization of building supply chain information. This article focuses on the integration of building supply chain information based on the analysis of BIM-IOT technology principles and advantages. Based on this, a building supply chain information management model based on BIM-IOT technology was established. The collaborative management model consists of a data layer, a core layer, an interaction layer, and a domain layer. From the aspects of construction project planning, engineering design, building construction, and operation management, the detailed description of the collaborative supply chain information management under the BIM-IOT technology model mechanism.
Research on Comprehensive Benefits Evaluation of Prefabricated Buildings Energy Saving
Authors: Wang Juan , Wang Shitong
Published: March 2020

In order to gain a deep understanding of the comprehensive benefits of prefabricated building energy efficiency. From the three aspects of economic benefit, environmental benefit and social benefit, the Delphi method was used to screen out 12 indicators. A comprehensive evaluation system for energy efficiency of fabricated buildings was constructed, and the comprehensive benefits of various energy saving measures were evaluated by TOPSIS entropy weight model. The results show that the energy efficiency of energy system and equipment efficiency, passive design energy conservation and the balance of building energy consumption through the use of renewable energy systems and the replacement of energy-saving three energy-saving measures can promote the improvement of comprehensive benefits. The benefits of energy efficiency and energy efficiency through energy systems and equipment are most pronounced. Finally, the scientific and effective evaluation of comprehensive benefits evaluation indicators and evaluation methods was verified by examples.
ISM Based Method for Risk Management of International EPC Projects
Authors: Song Yimeng , Hao Shengyue
Published: March 2020

In recent years, with the continuous development of the international engineering contracting market, the industry’s requirements for projects have also increased. It has gradually evolved into an international engineering procurement model with higher risk response capabilities and more complex project models. Due to the long construction time, large scale, fixed contract amount and other characteristics of international EPC projects, China’s international EPC projects still face multiple risks. This paper uses an Interpretative Structural Model to analyze the risk factors of international EPC projects. Then, construct a project risk model to consider the optimal strategy of risk control from a holistic and systematic perspective. It also puts forward effective risk management and control measures to provide a reference for risk assessment under the international EPC project management mode.
Research on Key Technologies of Intelligent Integrated System for Architectural Design Enterprises
Authors: Fang Changjian , Lai Yifeng , Wen Zhongjun
Published: March 2020

With the development of intelligent technology adopt in construction industry, architectural design enterprises’ implementation strategies and situations of smart design attracted much more attention. For architectural design enterprises, studying on intelligent integrated system to meet design management requirements is the major way to solve pain points and difficulties in design management, improve design management efficiency, and complete the transformation and upgrade. By analyzing and researching on key factors that restrict design management of architectural design enterprises, this study innovatively proposed and achieved a multi-specialty collaborative design management control method, a digital collaborative audit method, and a resource library standardization method. It has reference value of development of intelligent technology in architectural design enterprises.
A Multiple Method of Monitoring for Rainfall Induced Landslide
Authors: Luozang Qingpai , Gan Jianjun , Zhou Feng , Xin Lingen
Published: March 2020

Landslide induced by rainfall is very common in the world, which seriously threatens the safety and construction. Taking the landslide on the right bank of the Xiajiang Water Control Project as an example, this paper carried out comprehensive monitoring of groundwater level, earth pressure, and surface deformation of the landslide analyzed the landslide formation mechanism and predicted the stability of the landslide. The results show that the rainfall infiltration caused fluctuations in the groundwater level of the slope, which caused the instability of liquefaction in the shallow surface layer, fluctuations in the reservoir reduced the stability of the slope. Groundwater activity between the bedrock and the soil-rock mixture controls the slope stability to a large extent. Based on the comprehensive impact analysis of these triggering events, it is considered that the slope is undergoing continuous deformation and needs to be landslide management.
Fabrication and characterization of wound dressings containing gentamicin/silver for wounds in diabetes mellitus patients
Authors: Bie Xinyu , Khan Muhammad Qamar , Ullah Azeem , Ullah Sana , Kharaghani Davood , Phan Duy-Nam , Tamada Yasushi , Kim Ick Soo
Published: March 2020

In this study, the dual functional wound dressings for diabetic patients were fabricated with the help of gentamicin/ cellulose acetate by electrospinning. The resultant nanofibers were functionalized with silver nanoparticles (AgNPs) on its surface by a simple facile wetting process. Herein, gentamicin (Ge) was used for the objective to heal the infection inflammation and Ag NPs were loaded for the antibacterial properties. The resultant CA/Ge/Ag nanofibers were characterized for morphology analysis, chemical interactions examination, release behavior, structure analysis and antibacterial efficiency by scan electron microscope/ transmission electron microscope, FTIR/XPS, ICP study, XRD study and disc diffusion method of antibacterial, respectively. Based on characterization results it was concluded that all samples of CA/Ge/Ag nanofibers showed the antibacterial properties and appreciable release behavior.
On the energy decay rate of the fractional wave equation on ℝ with relatively dense damping
Authors: Green Walton
Published: March 2020

We establish upper bounds for the decay rate of the energy of the damped fractional wave equation when the averages of the damping coefficient on all intervals of a fixed length are bounded below. If the power of the fractional Laplacian,

s
s

, is between 0 and 2, the decay is polynomial. For

s
≥
2

s \ge 2

, the decay is exponential. Our assumption is also necessary for energy decay. Second, we prove that exponential decay cannot hold for

s
>
2

s>2

if the damping vanishes at all.
Iterated commutators under a joint condition on the tuple of multiplying functions
Authors: Hytönen Tuomas , Li Kangwei , Oikari Tuomas
Published: March 2020

We present a pair of joint conditions on the two functions

b
1

,

b
2

b_1,b_2

strictly weaker than

b
1

,

b
2

∈
BMO

b_1,b_2\in \operatorname {BMO}

that almost characterize the

L
2

L^2

boundedness of the iterated commutator

[

b
2

,
[

b
1

,
T
]
]

[b_2,[b_1,T]]

of these functions and a Calderón-Zygmund operator

T
T

. Namely, we sandwich this boundedness between two bisublinear mean oscillation conditions of which one is a slightly bumped up version of the other.
Corrigendum to “Strongly self-absorbing 𝐶*-dynamical systems”
Authors: Szabó Gábor
Published: March 2020

We correct a mistake that appeared in the first section of the original article, which appeared in Tran. Amer. Math. Soc. 370 (2018), 99–130. Namely, Corollary 1.16 was false as stated and was subsequently used in later proofs in the paper. In this note it is argued that all the relevant statements after Corollary 1.16 can be saved with at most minor modifications. In particular, all the main results of the original paper remain valid as stated, but some intermediate claims are slightly modified or proved more directly without Corollary 1.16.
Moderate deviations of subgraph counts in the Erdős-Rényi random graphs 𝐺(𝑛,𝑚) and 𝐺(𝑛,𝑝)
Authors: Goldschmidt Christina , Griffiths Simon , Scott Alex
Published: March 2020

The main contribution of this article is an asymptotic expression for the rate associated with moderate deviations of subgraph counts in the Erdős-Rényi random graph

G
(
n
,
m
)

G(n,m)

. Our approach is based on applying Freedman’s inequalities for the probability of deviations of martingales to a martingale representation of subgraph count deviations. In addition, we prove that subgraph count deviations of different subgraphs are all linked, via the deviations of two specific graphs, the path of length two and the triangle. We also deduce new bounds for the related

G
(
n
,
p
)

G(n,p)

model.
Differential graded algebra over quotients of skew polynomial rings by normal elements
Authors: Ferraro Luigi , Moore W.
Published: March 2020

Differential graded algebra techniques have played a crucial role in the development of homological algebra, especially in the study of homological properties of commutative rings carried out by Serre, Tate, Gulliksen, Avramov, and others. In this article, we extend the construction of the Koszul complex and acyclic closure to a more general setting. As an application of our constructions, we shine some light on the structure of the Ext algebra of quotients of skew polynomial rings by ideals generated by normal elements. As a consequence, we give a presentation of the Ext algebra when the elements generating the ideal form a regular sequence, generalizing a theorem of Bergh and Oppermann. It follows that in this case the Ext algebra is noetherian, providing a partial answer to a question of Kirkman, Kuzmanovich, and Zhang.
Bounds for Lacunary maximal functions given by Birch–Magyar averages
Authors: Cook Brian , Hughes Kevin
Published: March 2020

We obtain positive and negative results concerning lacunary discrete maximal operators defined by dilations of sufficiently nonsingular hypersurfaces arising from Diophantine equations in many variables. Our negative results show that this problem differs substantially from that of lacunary discrete maximal operators defined along a nonsingular hypersurface. Our positive results are improvements over bounds for the corresponding full maximal functions which were initially studied by Magyar.

In order to obtain positive results, we use an interpolation technique of the second author to reduce problem to a maximal function of main terms. The main terms take the shape of those introduced in work of the first author, which is a more localized version of the main terms that appear in work of Magyar. The main ingredient of this paper is a new bound on the main terms near

ℓ
1

\ell ^1

. For our negative results we generalize an argument of Zienkiewicz.
Counting integer points on quadrics with arithmetic weights
Authors: Kumaraswamy V.
Published: March 2020

Let

F
∈

Z

[
x
]

F \in \mathbf {Z}[\boldsymbol {x}]

be a diagonal, non-singular quadratic form in four variables. Let

λ
(
n
)

\lambda (n)

be the normalised Fourier coefficients of a holomorphic Hecke form of full level. We give an upper bound for the problem of counting integer zeros of

F
F

with

|

x

|

⩽
X

|\boldsymbol {x}| \leqslant X

, weighted by

λ
(

x
1

)

\lambda (x_1)

.
Aldous’s spectral gap conjecture for normal sets
Authors: Parzanchevski Ori , Puder Doron
Published: March 2020

LetSnS_{n}denote the symmetric group onnnelements, and letΣ⊆Sn\Sigma \subseteq S_{n}be a symmetric subset of permutations. Aldous’s spectral gap conjecture, proved by Caputo, Liggett, and Richthammer [J. Amer. Math. Soc. 23 (2010), no. 3, 831–851], states that ifΣ\Sigmais a set of transpositions, then the second eigenvalue of the Cayley graphCay(Sn,Σ)\mathrm {Cay\!}\left (S_{n},\Sigma \right )is identical to the second eigenvalue of the Schreier graph onnnvertices depicting the action ofSnS_{n}on{1,…,n}\left \{ 1,\ldots ,n\right \}. Inspired by this seminal result, we study similar questions for other types of sets inSnS_{n}. Specifically, we consider normal sets: sets that are invariant under conjugation. Relying on character bounds due to Larsen and Shalev [Invent. Math. 174 (2008), no. 3, 645–687], we show that for large enoughnn, ifΣ⊂Sn\Sigma \subset S_{n}is a full conjugacy class, then the second eigenvalue ofCay(Sn,Σ)\mathrm {Cay}\!\left (S_{n},\Sigma \right )is roughly identical to the second eigenvalue of the Schreier graph depicting the action ofSnS_{n}on ordered44-tuples of elements from{1,…,n}\left \{ 1,\ldots ,n\right \}. We further show that this type of result does not hold whenΣ\Sigmais an arbitrary normal set, but a slightly weaker one does hold. We state a conjecture in the same spirit regarding an arbitrary symmetric setΣ⊂Sn\Sigma \subset S_{n}, which yields surprisingly strong consequences.
Predominant Stroma-Rich Feature in Hyaline Vascular Variant of Castleman Disease Is Associated With Paraneoplastic Pemphigus
Authors: Wang Leyi , Nong Lin , Li Furong , Wang Xue , Wang Rui , Chen Xixue , Tu Ping , Dong Yujun , Li Ting , Zhu Xuejun , Wang Mingyue
Published: March 2020

Objectives

We aimed to describe the clinical and histopathologic features of Castleman disease (CD), particularly emphasizing its associations with paraneoplastic pemphigus (PNP) and prognosis.

Methods

We retrospectively enrolled 123 CD patients at our center. Clinical, pathologic, and laboratory data were reviewed.

Results

Fifty percent of the patients had PNP. Compared with those without PNP, patients with PNP-associated CD had more hyaline vascular (HV) variants (83.9% vs 57.4%), fewer mixed cellular variants (16.1% vs 24.6%), and no plasmacytic variants (0% vs 18.0%). Thirty-eight of 87 patients with the HV variant of CD (HV-CD) had stroma-rich (SR) features, and the incidence rate was higher in those with PNP-associated CD than in those without PNP (48.4% vs 13.1%, P < .001). The SR variant was associated with higher PNP-associated IgG titers than SR absence before surgery (median 1:160 vs 1:80, P = .019) or after surgery (median 1:160 vs 1:40, P = .013). The SR variant was also an unfavorable prognostic factor for CD survival in univariate analysis. The 3-year survival rates were 47.5% among those with PNP and 87.7% among those without PNP (P < .001).

Conclusions

PNP is associated with specific subtypes of CD and affects survival. The SR variant of HV-CD positively correlates with the incidence of PNP.
The Contribution of Neighborhood Socioeconomic Disadvantage to Depressive Symptoms Over the Course of Adult Life: A 32-Year Prospective Cohort Study
Authors: Elovainio Marko , Vahtera Jussi , Pentti Jaana , Hakulinen Christian , Pulkki-Råback Laura , Lipsanen Jari , Virtanen Marianna , Keltikangas-Järvinen Liisa , Kivimäki Mika , Kähönen Mika , Viikari Jorma , Lehtimäki Terho , Raitakari Olli
Published: March 2020

The association between socioeconomic disadvantage and increased risk of depressive symptoms in adulthood is well established. We tested 1) the contribution of early exposure to neighborhood socioeconomic disadvantage to later depressive symptoms throughout life, 2) the persistence of the potential association between early exposure and depressive symptoms, and 3) the contributions of other known risk factors to the association. Data were collected from the Young Finns Study, a prospective, population-based 32-year follow-up study that included participants aged 3–18 years at baseline in 1980. Participants were followed up with repeated measurements of depressive symptoms between 1992 and 2012 (n = 2,788) and linked to national grid data on neighborhood disadvantage via residential addresses. We examined the associations in mixed models separately for the 5-, 10-, 15-, and 20-year follow-ups. Living in a disadvantaged neighborhood during childhood and adolescence was associated with a higher level of depressive symptoms in adulthood during all follow-up periods (β = 0.07, P = 0.001) than living in a nondisadvantaged area. Individual adulthood socioeconomic status mediated the associations. These findings suggest that living in a socioeconomically disadvantaged area during childhood and adolescence has a long-lasting negative association with mental health irrespective of family-related risks, partially due to socioeconomic adversity later in life.
Strandedness during cDNA synthesis, the stranded parameter in htseq-count and analysis of RNA-Seq data
Authors: Srinivasan Krishna A , Virdee Suman K , McArthur Andrew G
Published: March 2020

RNA sequencing (RNA-Seq) is a complicated protocol, both in the laboratory in generation of data and at the computer in analysis of results. Several decisions during RNA-Seq library construction have important implications for analysis, most notably strandedness during complementary DNA library construction. Here, we clarify bioinformatic decisions related to strandedness in both alignment of DNA sequencing reads to reference genomes and subsequent determination of transcript abundance.
ScaffoldGraph: an open-source library for the generation and analysis of molecular scaffold networks and scaffold trees
Authors: Scott Oliver B , Edith Chan A W
Published: March 2020

ScaffoldGraph (SG) is an open-source Python library and command-line tool for the generation and analysis of molecular scaffold networks and trees, with the capability of processing large sets of input molecules. With the increase in high-throughput screening data, scaffold graphs have proven useful for the navigation and analysis of chemical space, being used for visualization, clustering, scaffold-diversity analysis and active-series identification. Built on RDKit and NetworkX, SG integrates scaffold graph analysis into the growing scientific/cheminformatics Python stack, increasing the flexibility and extendibility of the tool compared to existing software.

Availability and implementation

SG is freely available and released under the MIT licence at https://github.com/UCLCheminformatics/ScaffoldGraph.
Extended stochastic gradient Markov chain Monte Carlo for large-scale Bayesian variable selection
Authors: Song Qifan , Sun Yan , Ye Mao , Liang Faming
Published: March 2020

Stochastic gradient Markov chain Monte Carlo algorithms have received much attention in Bayesian computing for big data problems, but they are only applicable to a small class of problems for which the parameter space has a fixed dimension and the log-posterior density is differentiable with respect to the parameters. This paper proposes an extended stochastic gradient Markov chain Monte Carlo algorithm which, by introducing appropriate latent variables, can be applied to more general large-scale Bayesian computing problems, such as those involving dimension jumping and missing data. Numerical studies show that the proposed algorithm is highly scalable and much more efficient than traditional Markov chain Monte Carlo algorithms.
Killing the Behavioral Zombie: Genes, Evolution, and Why Behavior Isn’t Special
Authors: Zuk Marlene , Spencer Hamish G
Published: March 2020

The nature–nurture controversy seems to be a scientific zombie, an idea that will not die despite ample evidence that it is inaccurate and even damaging to our ideas about how characteristics evolve. The dilemma is particularly clear with regard to behavioral traits, such as intelligence or sexual orientation, where thinking that genes or the environment predominate can lead to flawed conclusions. We argue that, first, behavior is not special in its evolution but evolves in the same manner as other traits. Second, no trait, whether behavioral or otherwise, is caused by either genes or the environment or even by an additive combination of the two; the interaction is the important feature. Third, genes do not and cannot code for behavior or any other characteristic.