bluuebunny/crossref_metadata_2025 huggingface dataset:
A simple and rapid pipeline for identification of receptor-binding sites on the surface proteins of pathogens
Authors: Mertinková Patrícia , Kulkarni Amod , Káňová Evelína , Bhide Katarína , Tkáčová Zuzana , Bhide Mangesh
Published: January 2020

Ligand-receptor interactions play a crucial role in the plethora of biological processes. Several methods have been established to reveal ligand-receptor interface, however, the majority of methods are time-consuming, laborious and expensive. Here we present a straightforward and simple pipeline to identify putative receptor-binding sites on the pathogen ligands. Two model ligands (bait proteins), domain III of protein E of West Nile virus and NadA of Neisseria meningitidis, were incubated with the proteins of human brain microvascular endothelial cells immobilized on nitrocellulose or PVDF membrane, the complex was trypsinized on-membrane, bound peptides of the bait proteins were recovered and detected on MALDI-TOF. Two peptides of DIII (~916 Da and ~2003 Da) and four peptides of NadA (~1453 Da, ~1810 Da, ~2051 Da and ~2433 Da) were identified as plausible receptor-binders. Further, binding of the identified peptides to the proteins of endothelial cells was corroborated using biotinylated synthetic analogues in ELISA and immunocytochemistry. Experimental pipeline presented here can be upscaled easily to map receptor-binding sites on several ligands simultaneously. The approach is rapid, cost-effective and less laborious. The proposed experimental pipeline could be a simpler alternative or complementary method to the existing techniques used to reveal amino-acids involved in the ligand-receptor interface.
Deep learning interpretation of echocardiograms
Authors: Ghorbani Amirata , Ouyang David , Abid Abubakar , He Bryan , Chen Jonathan H. , Harrington Robert A. , Liang David H. , Ashley Euan A. , Zou James Y.
Published: January 2020

Echocardiography uses ultrasound technology to capture high temporal and spatial resolution images of the heart and surrounding structures, and is the most common imaging modality in cardiovascular medicine. Using convolutional neural networks on a large new dataset, we show that deep learning applied to echocardiography can identify local cardiac structures, estimate cardiac function, and predict systemic phenotypes that modify cardiovascular risk but not readily identifiable to human interpretation. Our deep learning model, EchoNet, accurately identified the presence of pacemaker leads (AUC = 0.89), enlarged left atrium (AUC = 0.86), left ventricular hypertrophy (AUC = 0.75), left ventricular end systolic and diastolic volumes ($${R}^{2}$$R2 = 0.74 and$${R}^{2}$$R2 = 0.70), and ejection fraction ($${R}^{2}$$R2 = 0.50), as well as predicted systemic phenotypes of age ($${R}^{2}$$R2 = 0.46), sex (AUC = 0.88), weight ($${R}^{2}$$R2 = 0.56), and height ($${R}^{2}$$R2 = 0.33). Interpretation analysis validates that EchoNet shows appropriate attention to key cardiac structures when performing human-explainable tasks and highlights hypothesis-generating regions of interest when predicting systemic phenotypes difficult for human interpretation. Machine learning on echocardiography images can streamline repetitive tasks in the clinical workflow, provide preliminary interpretation in areas with insufficient qualified cardiologists, and predict phenotypes challenging for human evaluation.
Catalytically-active porous assembly with dynamic pulsating motion for efficient exchange of products and reagents
Authors: Wu Shanshan , Huang Liping , Hou Yu , Liu Xin , Kim Jehan , Liang Yongri , Zhao Jiong , Zhang Liwei , Ji Hongbing , Lee Myongsoo , Huang Zhegang
Published: January 2020

Despite recent advances in the use of porous materials as efficient heterogeneous catalysts which operate through effectively trapping reagents in a well-defined space, continuously uptaking reagents to substitute products in the cavity for efficient product turnover still remains challenging. Here, a porous catalyst is endowed with ‘breathing’ characteristics by thermal stimulus, which can enable the efficient exchange of reagents and products through reversible stacking from inflated aromatic hexamers to contracted trimeric macrocycles. The contracted super-hydrophobic tubular interior with pyridine environment exhibits catalytic activity towards a nucleophilic aromatic substitution reaction by promoting interactions between concentrated reagents and active sites. Subsequent expansion facilitates the exchange of products and reagents, which ensures the next reaction. The strategy of mesoporous modification with inflatable transition may provide a new insight for construction of dynamic catalysts.
Magnetic oscillations induced by phonons in non-magnetic materials
Authors: Gurtubay Idoia G. , Iturbe-Beristain Aitzol , Eiguren Asier
Published: January 2020

An unexpected finding two decades ago demonstrated that Shockley electron states in noble metal surfaces are spin-polarized, forming a circulating spin texture in reciprocal space. The fundamental role played by the spin degree of freedom was then revealed, even for a non-magnetic system, whenever the spin-orbit coupling was present with some strength. Here, we demonstrate that, similarly to electrons in the presence of spin-orbit coupling, the propagating vibrational modes are also accompanied by a well-defined magnetic oscillation even in non-magnetic materials. Although this effect is illustrated by considering a single layer of the WSe2 dichalogenide, the phenomenon is completely general and valid for any non-magnetic material with spin-orbit coupling. The emerging phonon-induced magnetic oscillation acts as an additional effective flipping mechanism for the electron spin and its implications in the transport and scattering properties of the material are evident and profound.
TiO2–rGO nanocomposite as an efficient catalyst to photodegrade formalin in aquaculture's waters, under solar light
Authors: Leal Joana F. , Cruz Sandra M. A. , Almeida Bernardo T. A. , Esteves Valdemar I. , Marques Paula A. A. P. , Santos Eduarda B. H.
Published: January 2020

A solar photocatalytic process, using TiO2–rGO as photocatalyst, is proposed to degrade the formalin disinfectant. This process can treat aquaculture freshwater before its discharge or recirculation, promoting sustainable water.
Structural identification of percolation of nanoparticles
Authors: Musino Dafne , Genix Anne-Caroline , Chauveau Edouard , Bizien Thomas , Oberdisse Julian
Published: January 2020

Percolation is identified with a static scattering method on the scale of 1/qmin (here micron size), in agreement with rheological measurements of the storage modulus, and supported by electron microscopy.
Transition-metal phthalocyanine monolayers as new Chern insulators
Authors: Li Jie , Gu Lei , Wu Ruqian
Published: January 2020

To explore new materials for the realization of the quantum anomalous Hall effect (QAHE), we studied the electronic, magnetic and topological properties of transition-metal phthalocyanine (TMPc) monolayers in a square lattice.
Boric acid catalyzed chemoselective reduction of quinolines
Authors: Bhattacharyya Dipanjan , Nandi Sekhar , Adhikari Priyanka , Sarmah Bikash Kumar , Konwar Monuranjan , Das Animesh
Published: January 2020

Boric acid promoted transfer hydrogenation of substituted quinolines to synthetically versatile 1,2,3,4-tetrahydroquinolines (1,2,3,4-THQs) was described under mild reaction conditions using a Hantzsch ester as a mild organic hydrogen source.
Electrical conductivity of anisotropic PMMA composite filaments with aligned carbon fibers – predicting the influence of measurement direction
Authors: Qu Muchao , Nilsson Fritjof , Qin Yijing , Yang Guanda , Gao Qun , Xu Wei , Liu Xianhu , Schubert Dirk W.
Published: January 2020

Revealed logarithm longitude electrical conductivity σ∥ and transverse electrical conductivity σ⊥ of PMMA/CF composite filaments.
Digging deeper: structural background of PEGylated fibrin gels in cell migration and lumenogenesis
Authors: Shpichka A. I. , Konarev P. V. , Efremov Yu. M. , Kryukova A. E. , Aksenova N. A. , Kotova S. L. , Frolova A. A. , Kosheleva N. V. , Zhigalina O. M. , Yusupov V. I. , Khmelenin D. N. , Koroleva A. , Volkov V. V. , Asadchikov V. E. , Timashev P. S.
Published: January 2020

Fibrin is a well-known tool in tissue engineering, but the structure of its modifications created to improve its properties remains undiscussed despite their importance,e.g.in designing biomaterials that ensure cell migration and lumenogenesis.
Enhancement of photocatalytic hydrogen evolution with catalysts based on carbonized MOF-5 and g-C3N4
Authors: Aleksandrzak Malgorzata , Sielicki Krzysztof , Mijowska Ewa
Published: January 2020

The study presents enhancement of photocatalytic hydrogen generation after metal–organic framework (MOF5) carbonization at 700 °C and its utilization as a co-catalyst of graphitic carbon nitride (gCN).
Tellurium–oxygen group enhanced birefringence in tellurium phosphates: a first-principles investigation
Authors: Jin Pengyun , Shi Xuerui , Cui Xiuhua , Jiang Yi , Jing Qun , Lee Ming-Hsien , Long Mengqiu , Cao Haibin , Ding Hanqin
Published: January 2020

TeO5groups give main contribution to the very large birefringence of Te2P2O9.
Students’ interpretation and use of graphical representations: insights afforded by modeling the varied population schema as a coordination class
Authors: Rodriguez Jon-Marc G. , Stricker Avery R. , Becker Nicole M.
Published: January 2020

Explanations of phenomena in chemistry are grounded in discussions of particulate-level behavior, but there are limitations to focusing on single particles, or as an extension, viewing a group of particles as displaying uniform behavior. More sophisticated models of physical processes evoke considerations related to the dynamic nature of bulk solutions, in which an ensemble of molecules exists with a distribution of values that vary with respect to different parameters (e.g., speed, kinetic energy, etc.). Viewing phenomena as a varied population instead of a homogenous solution has been identified as a foundational idea that is critical for reasoning in chemistry, but little work has investigated how students reason about these ideas and how instructors can support students in viewing phenomena as a distribution of states. In this qualitative study, during semi-structured interivews twelve undergraduate general chemistry students were provided with frequency distribution graphs (number of molecules vs. speed, number of molecules vs. kinetic energy) and were asked to provide explanations and make predictions. The design and analysis of this study was informed by coordination class theory, a model within the knowledge-in-pieces perspective of cognition that defines a concept as a combination of approaches for obtaining information (read-out strategies) and a cluster of knowledge elements used to draw conclusions (causal net). Framing the varied population schema as a coordination class, this work focuses on the interaction between features students attended to in distribution graphs and the ideas they discussed. Analysis indicates students have productive resources for reasoning about a varied population in general terms, but these ideas are not necessarily activated when interpreting graphs, as reflected in the students’ readout strategies. Moreover, we posit that one of the barriers toward interpreting distribution graphs was the inappropriate application of covariational reasoning. As a practical consideration, we encourage interested instructors to review the Appendix, which provides a short summary of the main findings and suggestions for practitioners.
Tuning molecular motor transport through cytoskeletal filament network organization
Authors: Scholz Monika , Weirich Kimberly L. , Gardel Margaret L. , Dinner Aaron R.
Published: January 2020

Myosin II motor dynamics have signatures that report on the structure of the underlying network of crosslinked cytoskeletal filaments.
Correction: The intrinsic magnetism, quantum anomalous Hall effect and Curie temperature in 2D transition metal trihalides
Authors: Sun Jiaxiang , Zhong Xin , Cui Wenwen , Shi Jingming , Hao Jian , Xu Meiling , Li Yinwei
Published: January 2020

Correction for ‘The intrinsic magnetism, quantum anomalous Hall effect and Curie temperature in 2D transition metal trihalides’ by Jiaxiang Sun et al., Phys. Chem. Chem. Phys., 2020, DOI: 10.1039/c9cp05084a.
Correction: Diffusion dynamics of a single collapsed homopolymer globule at the solid–liquid interface
Authors: Cai Shali , Liu Jingjing , Tian Mengting , Wang Kang , Shen Lei
Published: January 2020

Correction for ‘Diffusion dynamics of a single collapsed homopolymer globule at the solid–liquid interface’ by Shali Cai et al., Soft Matter, 2020, DOI: 10.1039/c9sm02335f.
Overexpression of TGR5 alleviates myocardial ischemia/reperfusion injury via AKT/GSK-3β mediated inflammation and mitochondrial pathway
Authors: Li Junzhi , Cheng Ruining , Wan Hong
Published: January 2020

Ischemia/reperfusion (I/R) injury reduces cell proliferation, triggers inflammation, promotes cell apoptosis and necrosis, which are the leading reasons of morbidity and mortality in patients with cardiac disease. TGR5 is shown to express in hearts, but its functional role in I/R-induced myocardial injury is unclear. In the present study, we aimed to explore the underlying molecular mechanism of TGR5 in hypoxia/reoxygenation (H/R)-induced cardiomyocyte injury in vitro. The results showed that TGR5 was significantly up-regulated in H9C2 (rat cardiomyocyte cells) and human cardiomyocytes (HCMs) after H/R. Overexpression of TGR5 significantly improved cell proliferation, alleviated apoptosis rate, the activities of caspase-3, cleaved caspases-3 and Bax protein expression levels, and increased Bcl-2 level. Overexpression of TGR5 significantly up-regulated ROS generation, stabilized the mitochondrial membrane potential (MMP), and reduced the concentration of intracellular Ca2+ as well as cytosolic translocation of mitochondrial cytochrome c (cyto-c). Meanwhile, overexpressed TGR5 also enhanced the mRNA and protein levels of interleukin (IL)-10, and decreased the mRNA and protein levels of IL-6 and tumor necrosis factor α (TNF-α). The shTGR5+H/R group followed opposite trends. In addition, overexpressed TGR5 induced an increase in the levels of p-AKT and p-GSK-3β. The protective effects of TGR5 were partially reversed by AKT inhibitor MK-2206. Taken together, these results suggest that TGR5 attenuates I/R-induced mitochondrial dysfunction and cell apoptosis as well as inflammation, and these protections may through AKT/GSK-3β pathway.
High step‐up non‐isolated ZVS‐ZCS dc–dc Cúk‐based converter
Authors: Schmitz Lenon , Cacau Ronny G.A. , Horn Thamires P. , Martins Denizar C. , Coelho Roberto F.
Published: January 2020

This study proposes a novel high step‐up non‐isolated dc–dc converter based on the classical Ćuk converter with coupled inductor and voltage multiplier techniques. To further increase its voltage gain, the load is differentially connected between the input source and the output capacitor. The proposed converter presents reduced voltage stresses over the active switches and allows the design of low‐volume magnetic devices. Its quasi‐resonant operation mode guarantees zero‐current‐switching (ZCS) turn‐off of diodes, whereas the current ripple of the magnetic devices can be utilised to assist zero‐voltage‐switching (ZVS) turn‐on of active switches. A prototype circuit with 25–40‐V input voltage, 400‐V output voltage, and 200‐W output power is built and tested to verify its performance. The highest obtained efficiency is 97.2% and the weighted California Energy Commission (CEC) efficiencies are >95.7% over the entire input voltage range.
The final SDSS-IV/SPIDERS X-ray point source spectroscopic catalogue
Authors: Comparat J. , Merloni A. , Dwelly T. , Salvato M. , Schwope A. , Coffey D. , Wolf J. , Arcodia R. , Liu T. , Buchner J. , Nandra K. , Georgakakis A. , Clerc N. , Brusa M. , Brownstein J. R. , Schneider D. P. , Pan K. , Bizyaev D.
Published: January 2020

Aims. We look to provide a detailed description of the SPectroscopic IDentification of ERosita Sources (SPIDERS) survey, an SDSS-IV programme aimed at obtaining spectroscopic classification and redshift measurements for complete samples of sufficiently bright X-ray sources.

Methods. We describe the SPIDERS X-ray Point Source Spectroscopic Catalogue, considering its store of 11 092 observed spectra drawn from a parent sample of 14 759 ROSAT and XMM sources over an area of 5129 deg2 covered in SDSS-IV by the eBOSS survey.

Results. This programme represents the largest systematic spectroscopic observation of an X-ray selected sample. A total of 10 970 (98.9%) of the observed objects are classified and 10 849 (97.8%) have secure redshifts. The majority of the spectra (10 070 objects) are active galactic nuclei (AGN), 522 are cluster galaxies, and 294 are stars.

Conclusions. The observed AGN redshift distribution is in good agreement with simulations based on empirical models for AGN activation and duty cycle. Forming composite spectra of type 1 AGN as a function of the mass and accretion rate of their black holes reveals systematic differences in the H-beta emission line profiles. This study paves the way for systematic spectroscopic observations of sources that are potentially to be discovered in the upcoming eROSITA survey over a large section of the sky.
Architectural Modeling Design based on Reciprocal Structure
Authors: Hao Tong
Published: January 2020

The innovation of this research is to build connection between the traditional reciprocal structure and the contemporary architectural modeling design. The purpose of this reasearch is to explore the design method of architectural modeling based on mutual structure. Firstly, the reciprocal structure is classified according to the multi-dimensionality of the construction mode.Secondly, the relationship between the mutual structure and the architectural modeling is explained. Finally, the three factors affecting the architectural modeling on the basis of mutual structure are summarized: 1) morphology; 2) interface; 3) space, and then from these three layers to present the shaping method.
Applications of BIM in Construction Engineering in China：A Review
Authors: Heng LI , Hong-yu LI
Published: January 2020

Based on the CNKI database from 2002-2019, this paper conducts the comprehensive literature survey on the BIM applications in construction engineering. Aiming to pros and cons summarized from the current research examples, the BIM shows great potential and the related study is a rapidly evolving field in construction engineering. In general, the diversity of BIM application studies is involved in construction engineering, such as, design and construction of new building, operation and maintenance of the existing buildings. BIM can be a powerful tool if it was properly taken advantage. However, the BIM application in design is more emphasized than that in the other aspects, which hinders the popularization of its application. Therefore, suggestions for future research are given accordingly: (i) constructing a feasible and flexible system according to the different applications; (ii) expanding the research content based on proposed system; (iii) establishing a method of evaluation of BIM application.
Study on the modernisation of an extra-worn district heating (DH) system in Russia: low temperature DH and 4 more options processing
Authors: Chicherin Stanislav , Junussova Lyazzat , Junussov Timur
Published: January 2020

Modeling was performed on the base of the DH system located in Omsk, Russia, where the DH network temperature requirements are not met and design outdoor temperature of extreme -37°C is. Surveyed investment in a transmission line to avoid penalties on disturbances is projected to have an original supply temperature of 150°C and is denoted as Case-1. The second idea (Case-2) envisages installing a heat pump and increasing the supply temperature in peak load periods during the heating season. The third option is to use of in-room terminal systems to provide heating to individual zones. Case-4 assumes maintaining an ordinary DH network without using any energy-efficient alternative and significant repair which means that the system continuous working ‘as is’. The fifth option introduces low temperature district heating (LTDH) concept featuring a low supply temperature and smart control. To sum up, this research indicates location of a heat pump and also shows how the piping system will be offset to allow the normal operation. This study presents a framework to represent, aggregate, dynamic thermal model and modernize a DH system based on a high-level equation-based simulation software and a five-option feasibility study.
Research on the Difference of Physical Parameters of Concrete in Saline-alkali Environment
Authors: Qi Yumao , Huang Junge , Liu Yu , Pei Jian
Published: January 2020

In order to better study the corrosion of concrete in saline-alkali area, the model tests of concrete and reinforced concrete with different ions and different ion concentrations were constructed. Taking the test blocks mixed with water as the control group, the resistance and polarizability of the test block during the maintenance period were measured by rock specimen tester and rock specimen test frame. The one-way variance analysis of the measured values of each test block was carried out by spss software, investigating the difference of electrical parameters of each concrete. The results show that there is significant difference in the resistance between the clear water concrete test block and the 3% sodium sulfate concrete test block at the level of significance ≤ 0.05. For reinforced concrete test blocks, the resistivity difference between water test block and 3% sodium sulfate test block and 6% sodium sulfate test block is not significant, and the resistivity difference between water test block and 15% sodium sulfate test block and 3% sodium chloride test block is significant. No matter concrete or reinforced concrete, the polarizability of test blocks mixed with water and test blocks mixed with each solution is significantly different. Therefore, the polarizability parameters can be used to distinguish whether the concrete is corroded by salt and alkali. It is feasible to use polarizability parameter to detect concrete erosion by salt and alkali.
Thermoelastic analysis of a geological repository with distributed decay heat sources by the image method in combination with a numerical integration scheme
Authors: Liu Dongdong , Xiang Yanyong
Published: January 2020

The disposal of nuclear waste involves thermo-mechanical reaction of the host rock to the buried waste – a distributed heat source that decays. To solve the problem within the half infinite space confined by the ground surface, an image method is developed. Specifically, a negative image of the heat source with the ground surface as the mirror, i.e. a mirrored heat sink is utilized so that the normal traction generated by the heat source can be counterbalanced, and a numerical scheme of integration of the classical Cerruti solution is developed to include the effect of tangential shear traction on the ground surface caused by the heat sources and their mirrored sinks. For a conceptual repository model, large thermal shear stress, tensile stress, and deformation occur at the corner, between adjacent drifts, and at the boundary of the repository area, respectively. For a prescribed thermal loading, it is more efficient to mitigate the thermo-mechanical effects through enlarging the pit spacing than increasing the drift spacing.
Study on the system of calcined desulfurization gypsum - aluminate cement - slag powder cement
Authors: Zhang Xiong , Ren Hao , Ji Tao , Liao Gaoyu , Zhang Yongjuan
Published: January 2020

In this study, by adding a small amount of calcined desulfurization gypsum and aluminate cement into slag powder cement, the effects of calcined desulfurization gypsum and aluminate cement on the flowability, mechanical properties and volume stability of the composite cementitious system were studied. The results show that the mechanical properties and volume stability of the composite cementitious system can be improved by adding appropriate amount of calcined desulfurization gypsum and aluminate cement. For example, when the ratio of sulfur to aluminum is 0.5:1, the compressive strengths of calcined desulfurization gypsum-aluminate cement-slag powder cement composite cementitious system increases by 34% in 1 day, 8% in 180 days, the free expansion rates are less than 0.6%, and the expansion stresses are less than tensile strengths. The volumes are stable. The hydration products of the system mainly include AFt, Ca(OH)2 and C-S-H. During the hydration process, some of the calcined desulfurization gypsum will be converted into dihydrate desulfurization gypsum.
Adaptability analysis of load limit standard for prestressed hollow slab bridge
Authors: Li Yazhou , Dong Li
Published: January 2020

In recent years, with the rapid development of social economy and highway transportation, the phenomenon of overweight transportation is increasingly serious, which is the main reason for the frequent occurrence of bridge collapse accidents in our country, causing heavy economic losses and casualties to the society.Due to the lack of unified bridge load limit management standards at the national level, it is difficult to fundamentally improve the adverse situation of bridge overload operation by relying on the existing overlimit management measures.Based on this background, we made the following work:(1) load carrying capacity check and calculation of prestressed hollow slab bridge: check whether the bridge used meets the requirements of the specification, so as to provide a reliable engineering basis for the analysis of load limit value in the following paper.According to the 04 specification, the load carrying capacity of the car is checked and calculated to verify whether the bridge meets the design requirements of the load carrying capacity.Then, the mid-span deflection of the bridge and the crack resistance of the main beam are checked to determine whether the bridge meets the design requirements in the normal limit state of use.(2) prestressed hollow slab bridge limit load values adaptability analysis first, calculates the design safety grade level on the limit load of prestressed cored slab jointless security levels of primary, secondary and tertiary limit load vehicle load effect, on this basis, from bearing capacity limit state and serviceability limit state analysis of the bridge limit load values of adaptation.
Application of Glodon BIM 5D technology in Gucun international foreign language school
Authors: Yuan Zhijie , Li Hua , Xu Feng
Published: January 2020

Glodon BIM5D technology was used in the project of gucun world foreign language school, which connected the BIM 3d model of the project with the construction progress and project cost. The results showed that the project team uses the same model for engineering calculation and valuation. The automatic calculation of the imported model not only improved the accuracy of compiling budget estimates and budgets, but also shortened the time of compiling budget estimates and budgets by 30% and saved the construction period. Glodon BIM 5D was used to get through the model, cost and schedule information to help optimize the construction organization and strengthen the control of the construction process.
Creative Research on Rural Tourism Products Based on TAIM Model – Take Xintian Village of Quanzhou County as an Example
Authors: Liu Ying , Wang Rong
Published: January 2020

At present, the development of rural tourism in China is faced with the embarrassment of "small scale, flat resources" and the lack of creative planning methods, which leads to the serious problem of the simplification and homogeneity of rural tourism products. From the perspective of cultural creativity, this paper puts forward TAIM model of rural tourism product development, and takes "Guangxi district-level rural tourism poverty alleviation village" Xintian village of Quanzhou county as an example to make an empirical analysis of this model, in order to provide some inspiration for the development of rural tourism products in China.
Research on Wuhan Sponge City Construction and Water Resumption System
Authors: Li Hongmin , Yan Lu
Published: January 2020

Pocket parks are small public spaces between building entities which are available to the public. It can be located in a city, suburb, or country. It has a small area and is relatively flexible. According to the characteristics of China's cities, this article puts forward methods and measures for the landscape reconstruction design of existing urban communities in China. The thesis takes a Residential area of a certain district in Wuhan as a design case. It discusses how to combine the landscape design of the existing community with the rainwater problem, the goals, principles and measures of the landscape reconstruction design of the existing community based on the sponge city concept are proposed. Using rainwater as a resource to collect, purify, store, and recycle, alleviate water shortages and urban flood disasters, and it summarizes the methods and strategies for landscape reconstruction design of existing communities. Finally, according to the problems in the residential area and the actual needs of residents, combined with the current conditions of the site, following the design principles of people-oriented and local conditions, the use of sponge city technology measures on the green landscape, roads and parking lots, rooftop landscape of underground garages, plants Matching and other specific reconstruction designs provide theoretical and design references for the application of the "sponge city" concept in the design of urban residential quarters.
Study on the Thermal Environment Inside a Fully-Enclosed Subway Noise Barrier
Authors: Liu Lei , Zhang Lianghan , Kang Zhongxu , Yao Kun
Published: January 2020

The thermal environment inside a fully-enclosed subway noise barrier shall be designed according to underground section tunnel standards. This article constructs a model using practical examples, simulates calculations on fully-enclosed noise barrier installations both with and without air vents via a threedimensional numerical simulation method, and then conducts a comparative analysis of the effects noise barrier lengths and air vent widths have on an internal thermal environment. The calculation results show that when the length of the fully-enclosed noise barrier without air vents was 100m, the internal thermal environment exceeded the limit; as the width of the air vents increased, the temperature in the internal environment gradually decreased, but the reduction was less once the air vent width exceeded 2 m; When the top air vent width was 2 m, and the noise barrier length was 100m, the thermal environment was found to meet requirements. As the noise barrier length increased, the internal air temperature exceeded the standards by varying degrees.
The influence of coupling on the whole process of construction simulation of chord dome structure
Authors: Liu Jing , Meng Fei , Chen Yingqi , Chen Zongxue
Published: January 2020

：Chord dome structure is a new type of hybrid prestressed spatial steel structure system, which is often used in large-span structures. During the construction of the structure, it is necessary to apply prestress to the ring cable. Taking the chord dome roof of Hebei North University gymnasium as an example, the whole process of prestressed cable construction is simulated and analyzed by using the finite element software ANSYS. The hoop cable of the dome roof can slide freely in the hoop direction, and the attribute of free sliding in the ANSYS interface is "coupling". In this paper, two kinds of simulation models, coupling and uncoupling, are established to compare, and then to explore the influence of coupling on the construction process of string dome structure.
Quantitative Analysis of the Sustainable Development Capacity of Regional Water Resources：A case study of Sichuan Province
Authors: Liang Xuedong , Yang Li , Ye Meng , Deng Guoying
Published: January 2020

Limited water resources have become a serious problem in recent decades. Based on previous research results, this article develops an index system to evaluate sustainable water resource development that includes a water resource condition system, a water resource development and utilization system, a water resource protection and management system, and a socio-economic system. A measurement model is then constructed based on a principal component analysis (PCA) -entropy weights-weighted average method to optimize the evaluation index system for dimensionality reduction, to assign weights to the principal component factors, and allow for a comprehensive evaluation of water resource sustainability. The measurement model is applied to an empirical analysis of sustainable water resource development in Sichuan Province from 2008 to 2017, from which it is found that coordinated sustainable regional water resource and social economic development can be achieved through rational exploitation, efficient utilization, and environmental water pollution control. This research could provide a reference for regional sustainable development of water resources and policy developments.
Investigating the zinc ion adsorption capacity of a chitosan/β-cyclodextrin complex in wastewater
Authors: Liu Jiaxin , Wang Siqi , Ding Xiuqing , Fu Jingyi , Zhao Jun
Published: January 2020

To decrease the amount of Zn2+ in industrial waste water, in this study, β-cyclodextrin (β-CD) was first modified and then used to obtain a β-cyclodextrin polymer (β-CDP). The effects of reaction temperature and reaction time of β-CD with citric acid (CA), polyethylene glycol 400 (PEG-400), and disodium hydrogen phosphate (NaH2PO4) on the amount of β-CDP produced were investigated. The results showed that at a reaction temperature of 145 °C and a reaction time of 4.5 h, 6.58 g of β-CDP was produced. Then, chitosan (CTS) was crosslinked with β-CDP using glutaraldehyde to prepare a chitosan/β-cyclodextrin (CTS/β-CDP) complex. The mass ratio of CTS to β-CDP, reaction temperature, reaction time, and amount of added glutaraldehyde were used as the main variables to examine the Zn2+ adsorption rate and adsorption capacity of the composites prepared in this study. The optimum experimental conditions were as follows: a mass ratio of 3:10, a reaction temperature of 80 °C, a reaction time of 90 min, and 2 mL of glutaraldehyde. Under these optimal conditions, the adsorption amount and adsorption rates of Zn2+ using CTS/β-CDP complex were respectively 97.70 mg·g-1 and 78.92%.
Arsenic content in the Jie River and its release behaviour from river sediments
Authors: Ma Guangxiang , Huang Lizhu , Kang Xingsheng , Xu Qing , Zhou Guofeng , Fan Hongkai , Zhang Wenhui , Sun Jianzhang , Meng Yingjie , Qiu Jinwei , Gu Junjie , Ma Tao
Published: January 2020

Water and sediment samples of Jie River, China were collected and analyzed. The results showed that the average arsenic volume of water sample was 0.42 mg L-1 present in the Jie River. Among the riverway, the arsenic volume and pH kept rising with the flow. Standard leaching experiments showed the leachability of the sediments was lower than the hazardous materials permitted threshold volume but the leaching liquid exceeded the environmental quality standard for surface water which means the sediments might be a source to leach arsenic into aqueous system. In order to figure out the actual situation, simulated leaching experiments were performed. The results revealed that the sediments leaching could aggravate the water quality which was mostly influenced by the agitation and temperature. Solidification procedure was tested and suggested that with clean sand paved on the sediment, the amount of leaching arsenic will decrease 77.89%. Thus, it is of great help to apply cleaned sediments to remediate the contaminated sediments to reduce the leaching of arsenic into the aqueous system.
Analysis of Main Influencing Factors of the Wastewater Evaporation in Flue Duct
Authors: Pan Haowei , Zhang Liang , Li Wei , Gao Ning , Liu Yin
Published: January 2020

Desulfurization wastewater has the characteristics of small discharge and high pollution, and must be strictly treated. To obtain the main factors affecting the evaporation characteristics of desulfurization wastewater in boiler flue, a 600MW unit of a coal-fired power plant in China was taken as an example. According to the theory of fluid mechanics and heat transfer, the numerical simulation method was used. The results show that the way the nozzle is installed on the upper wall of the flue inlet can enhance the evaporation effect of the desulfurization wastewater. It is also revealed that the influence of the flue gas flow rate on the droplet evaporation effect is relatively small. The smaller droplet diameter and the higher flue gas inlet temperature will obviously enhance the evaporation effect of the droplets in the flue. However these two factors will increase the operating cost and reduce the boiler thermal efficiency. Therefore, the values of the droplet diameter and the flue gas inlet temperature need to be further determined by technical and economic comparison.
GIS-supported evaluation of landslide susceptibility in the karst mountainous area：A case study in Wudang, Guiyang
Authors: Li Song , Bai Yi , Long Yongjun , Wang Maoqiang
Published: January 2020

Landslide is the main disaster in the mountainous area. Based on landslide information content models of remote sensing, the work used the aerial and space remote sensing of UltraCamXp WA, Beijing-1 and Landsat images in Wudang, Guiyang to obtain the relative relief, slope, curvature of bedding slope, LUCC, geology and TWI. Finally, we analyzed the spatial susceptibility in the research area. Results showed that there were 42, 56 and 46 potential landslide groups in the high, higher and medium risk regions. The controlling factors of landslides in Wudang, Guiyang refer to the precipitation and precipitation intensity. The densely-populated regions also have the high risk of landslide, and the risk of landslide generally decreases from cities to rural areas. Through the space prediction research of landslide disasters, it is expected to provide valuable protection for regional security and harmonious development, and then sustainable development of Guizhou Province.
Research progress of in-situ remediation of polluted soil and groundwater by electrokinetic and permeable reaction barrier
Authors: Peng Shengjie , Wang Xiaodong , Zhang Xiaohui
Published: January 2020

The combination of electrokinetic remediation and permeable reactive barrier (EK-PRB combined remediation technology) is a new green technology for in-situ removal of soil and groundwater pollutants. This technology combines the advantages of electrokinetic remediation and permeable reactive barrier technology, and can deal with different types of organic and inorganic pollutants. It has the characteristics of convenient installation, simple operation, no secondary pollution, etc., and has broad development and application prospect. This paper introduces the technical principle of EK-PRB, summarizes the latest research results on the remediation of heavy metal, organic matter and nitrate contaminated soil and groundwater by the electrokinetic remediation and PRB. Finally,the technical problems of combinated remediation were pointed out, and development and application direction of this technology was noted.
Application Status and Evaluation of Aquatic Plants in Wuhan Landscape Waters
Authors: He Shijing , Zhang Xingyang , Sun Youyuan , Zeng Yan , Dai Huan
Published: January 2020

The purpose of this study is to explore the landscape quality of aquatic plants in the landscape water in Wuhan, reveal the rules of its construction, and provide some basis for landscape design and evaluation of aquatic plants. Based on the six representative parks in Wuhan, 9 quantitative and qualitative indexes were selected, and the evaluation model was constructed by using the analytic hierarchy process(AHP). The results showed that a total of 36 species of aquatic plants were found, mainly emergent plants. The five research objects are in grade Ⅰ and Ⅱ, and only the aquatic plants in Shahu Park are at the level of level Ⅲ, which indicates that the quality of aquatic plants in the main landscape water of Wuhan is at an excellent level. The evaluation model can objectively be used in the Wuhan landscape water body . Based on the evaluation results, 3 excellent aquatic plant plots are recommended.
Research on the Impact of Technological Innovation on Environmental Pollution -- Based on the Moderating Effect of Internet Development
Authors: Wu Jinghua
Published: January 2020

Based on the provincial panel data from 2003 to 2015, this paper empirically investigates the impact of technological innovation on environmental pollution, and explores the moderating role of Internet development in this impact. It is found that technological innovation has a significant inhibitory effect on regional environmental pollution. The development level of the Internet has a significant regulating effect on the process of technological innovation affecting environmental pollution, which is manifested in that the improvement of the Internet development level can further enhance the inhibiting effect of technological innovation on environmental pollution and promote regional energy conservation and emission reduction. Based on the above analysis, this paper puts forward the corresponding countermeasures and suggestions.
Probing the subsurface of the two faces of Iapetus
Authors: Bonnefoy Léa E. , Lestrade Jean-François , Lellouch Emmanuel , Le Gall Alice , Leyrat Cédric , Ponthieu Nicolas , Ladjelate Bilal
Published: January 2020

Saturn’s moon Iapetus, which is in synchronous rotation, is covered by an optically dark material mainly on its leading side, while its trailing side is significantly brighter. Because longer wavelengths probe deeper into the subsurface, observing both sides at a variety of wavelengths brings to light possible changes in thermal, compositional, and physical properties with depth. We have observed Iapetus’s leading and trailing hemispheres at 1.2 and 2.0 mm, using the NIKA2 camera mounted on the IRAM 30-m telescope, and compared our observations to others performed at mm to cm wavelengths. We calibrate our observations on Titan, which is simultaneously observed within the field of view. Due to the proximity of Saturn, it is sometimes difficult to separate Iapetus’s and Titan’s flux from that of Saturn, detected in the telescope’s side lobes. Preliminary results show that the trailing hemisphere brightness temperatures at the two wavelengths are equal within error bars, unlike the prediction made by Ries (2012)[1]. On the leading side, we report a steep spectral slope of increasing brightness temperature (by 10 K) from 1.2 to 2.0 mm, which may indicate rapidly varying emissivities within the top few centimeters of the surface. Comparison to a diffuse scattering model and a thermal model will be necessary to further constrain the thermophysical properties of the subsurface of Iapetus’s two faces.
Biases in the estimation of velocity dispersions and dynamical masses for galaxy clusters
Authors: Ferragamo A. , Rubiño-Martín J.A. , Betancort-Rijo J. , Munari E. , Sartoris B. , Barrena R.
Published: January 2020

Using a set of 73 numerically simulated galaxy clusters, we have characterised the statistical and physical biases for three velocity dispersion and mass estimators, namely biweight, gapper and standard deviation, in the small number of galaxies regime (Ngal ≤ 75), both for the determination of the velocity dispersion and the dynamical mass of the clusters via the σ–M relation. These results are used to define a new set of unbiased estimators, that are able to correct for those statistical biases. By applying these new estimators to a subset of simulated observations, we show that they can retrieve bias-corrected values for both the mean velocity dispersion and the mean mass.
A low-mass galaxy cluster as a test-case study for the NIKA2 SZ Large Program
Authors: Kéruzoré F. , Adam R. , Ade P. , André P. , Andrianasolo A. , Arnaud M. , Aussel H. , Bartalucci I. , Beelen A. , Benoît A. , Bideaud A. , Bourrion O. , Calvo M. , Catalano A. , Comis B. , De Petris M. , Désert F.-X. , Doyle S. , Driessen E.F.C. , Gomez A. , Goupy J. , Kramer C. , Ladjelate B. , Lagache G. , Leclercq S. , Lestrade J.-F. , Macías-Pérez J.F. , Mauskopf P. , Mayet F. , Monfardini A. , Perotto L. , Pisano G. , Pointecouteau E. , Ponthieu N. , Pratt G.W. , Revéret V. , Ritacco A. , Romero C. , Roussel H. , Ruppin F. , Schuster K. , Shu S. , Sievers A. , Tucker C. , Zylka R.
Published: January 2020

High-resolution mapping of the hot gas in galaxy clusters is a key tool for cluster-based cosmological analyses. Taking advantage of the NIKA2 millimeter camera operated at the IRAM 30-m telescope, the NIKA2 SZ Large Program seeks to get a high-resolution follow-up of 45 galaxy clusters covering a wide mass range at high redshift in order to re-calibrate some of the tools needed for the cosmological exploitation of SZ surveys. We present the second cluster analysis of this program, targeting one of the faintest sources of the sample in order to tackle the difficulties in data reduction for such faint, low-SNR clusters. In this study, the main challenge is the precise estimation of the contamination by sub-millimetric point sources, which greatly affects the tSZ map of the cluster. We account for this contamination by performing a joint fit of the SZ signal and of the flux density of the compact sources. A prior knowledge of these fluxes is given by the adjustment of the SED of each source using data from both NIKA2 and the Herschel satellite. The first results are very promising and demonstrate the possibility to estimate thermodynamic properties with NIKA2, even in a compact cluster heavily contaminated by point sources.
Debris disks around stars in the NIKA2 era
Authors: Lestrade J.-F. , Augereau J.-C. , Booth M. , Adam R. , Ade P. , André P. , Andrianasolo A. , Aussel H. , Beelen A. , Benoît A. , Bideaud A. , Bourrion O. , Calvo M. , Catalano A. , Comis B. , De Petris M. , Désert F.-X. , Doyle S. , Driessen E.F.C. , Gomez A. , Goupy J. , Holland W. , Kéruzoré F. , Kramer C. , Ladjelate B. , Lagache G. , Leclercq S. , Lefèvre C. , Macías-Pérez J.F. , Mauskopf P. , Mayet F. , Monfardini A. , Perotto L. , Pisano G. , Ponthieu N. , Revéret V. , Ritacco A. , Romero C. , Roussel H. , Ruppin F. , Schuster K. , Shu S. , Sievers A. , Thébault P. , Tucker C. , Zylka R.
Published: January 2020

The new NIKA2 camera at the IRAM 30m radiotelescope was used to observe three known debris disks in order to constrain the SED of their dust emission in the millimeter wavelength domain. We have found that the spectral index between the two NIKA2 bands (1mm and 2mm) is consistent with the Rayleigh-Jeans regime (λ-2), unlike the steeper spectra (λ-3) measured in the submillimeter-wavelength domain for two of the three disks - around the stars Vega and HD107146. We provide a succesful proof of concept to model this spectral inversion in using two populations of dust grains, those smaller and those larger than a grain radius a0 of 0.5mm. This is obtained in breaking the slope of the size distribution and the functional form of the absorption coefficient of the standard model. The third disk - around the star HR8799 - does not exhibit this spectral inversion but is also the youngest.