bluuebunny/crossref_metadata_2025_split huggingface dataset:
Relax-and-split method for nonconvex inverse problems
Authors: Zheng Peng , Aravkin Aleksandr 
Published: July 2020

AbstractWe develop and analyze a new ‘relax-and-split’ (RS) approach for inverse problems modeled using nonsmooth nonconvex optimization formulations. RS uses a relaxation technique together with partial minimization, and brings classic techniques including direct factorization, matrix decompositions, and fast iterative methods to bear on nonsmooth nonconvex problems. We also extend the approach to robustify any such inverse problem through trimming, a mechanism that robustifies inverse problems to measurement outliers. We then show practical performance of RS and trimmed RS (TRS) on a diverse set of problems, including: (1) phase retrieval, (2) semi-supervised classification, (3) stochastic shortest path problems, and (4) nonconvex clustering. RS/TRS are easy to implement, competitive with existing methods, and show promising results on difficult inverse problems with nonsmooth and nonconvex features.
Simple equipment for teaching internal photoelectric
effect
Authors: Schirripa Spagnolo Giuseppe , Postiglione Adriana , De Angelis Ilaria 
Published: July 2020

Abstract
In this paper, an educational tool is proposed to show the internal photoelectric
effect in a simple and clear way for Undergraduate Physics courses or High
Schools. Experimental evidence of the photoelectric effect is particularly
important in the didactic experience. This effect is fundamental to introduce
students to the world of quantum mechanics, and to the concept of quantized
energy. However, it often requires uneconomical and not easy to use equipment.
For this reason, here we describe the realization of a simple and low-cost
system based on the LED to LED structure; LEDs can in fact act as light sources,
but also as photodetectors, being sensitive to wavelengths equal to or shorter
than the predominant wavelength they emit. Through the lightning of LEDs of
different colors, we thus show that the verification of the photoelectric effect
becomes easy.
Impact of heterogeneous gate dielectric on DC, RF and circuit-level performance of source-pocket engineered Ge/Si heterojunction vertical TFET
Authors: Tripathy Manas Ranjan , Singh Ashish Kumar , Samad A , Singh Prince Kumar , Baral Kamalaksha , Jit Satyabrata 
Published: July 2020

Abstract
This paper reports the DC, RF and circuit-level performance analysis of short-channel Ge/Si based source-pocket engineered (SPE) vertical heterojunction tunnel field effect transistors (Ge/Si SPE-V-HTFETs) with and without a heterogeneous gate dielectric (HGD) structure for the first time. The DC performance parameters in terms of ION/IOFF and subthreshold swing (SS) are investigated for the proposed V-HTFETs. The average SS for the proposed V-HTFET with an HGD is found to be as low as 20 mV dec−1 compared to V-HTFET without any HGD (26 mV dec−1) at VDS = 0.5 V. The proposed Ge/Si SPE-V-HTFET with an HGD possesses higher cut-off frequency of 502 GHz and maximum frequency of oscillation of 2.33 THz at VDS = 0.5 V over the Ge/Si SPE-V-HTFET without any HGD which possesses cut-off frequency of 273 GHz and maximum frequency of oscillation of 1.47 THz. The proposed Ge/Si SPE-V-HTFET with and without an HGD have then been used for designing a basic current mirror circuit. Device-level study has been carried out using SILVACO ATLASTM TCAD simulator while the circuit-level investigation has been performed using the look up table based Verilog-A models in the CADENCE Virtuoso tool. The performances of the Ge/Si SPE-V-HTFET with HGD based current mirror circuit is observed to be better than the corresponding current mirror circuit designed by Ge/Si SPE-V-HTFET without any HGD.
Quantum phases for bosons in a magnetic lattice with a harmonic trap
Authors: Song Ya-Fei , Yang Shi-Jie 
Published: July 2020

Abstract
The phase diagram of ultracold bosons in a 2D optical lattice subjected to a uniform magnetic flux is studied by the inhomogeneous Gutzwiller variational method. With a harmonic external potential, the density profile exhibits wedding-cake shape and the Mott phase forms a series of circular platforms with integer fillings. There are annular rings of superfluid between these platforms. We identify a lot of phases, including the unicirculation phase, the Meissner phase, the vortex phase, the reversed current phase and the vortex superfluid phase, by examining the super-currents. The circular chiral currents of the reversed current phase are opposite to other phases in annular superfluid and we analyzed the transitions between different phases.
Evaluation of geomorphologic similarity between the sub-catchments of Cauvery river basin
Authors: Gowri R , Mujumdar P P 
Published: July 2020

Abstract
Estimation of morphometric indices can be useful in defining similarity relationships between catchments over a wide range of scales and it facilitates the effective understanding of hydrogeologic processes. This study aims at evaluating morphometric parameters to investigate geomorphologic similarity between the sub-catchments of the Cauvery river basin which is a major river basin in Peninsular India. The Digital Elevation Model (DEM) obtained from Shuttle Radar Topographic Mission (SRTM) at 30 m spatial resolution is used for assessing the linear, areal and relief aspects of morphometric analysis. The stream network analysis of sub-catchments reveals that the basin is dominated by streams of lower order and the Cauvery basin can be characterized as a seventh order basin. Linear parameters indicate that the basin is subjected to less structural disturbances. Assessment of areal parameters shows that most of the sub-catchments have elongated shape, low drainage density and course drainage texture. Evaluation of relief parameters suggests that the sub-catchments have mild slopes with moderate ruggedness and resistant soil surface. The sub-catchments are found to be geomorphologically similar in behaviour and this analysis can throw insight on development of scaling relationships as well as hydrological predictions in ungauged areas of the drainage basin.
Adsorption of copper ions from waste water using PPy/Al2O3-Fe2O3 nanocomposite
Authors: Mary Lissy P N , Madhu G , Thomas Roy M 
Published: July 2020

Abstract
The performance of Alumina-Iron Oxide nanocomposite as an adsorbent in the removal of Copper has been investigated. The experimental studies reveal that the removal of heavy metal from waste water can be increased within shorter duration when the nanocomposite is coated with a suitable polymer. The adsorptive properties of prepared nanocomposite with and without polymer were evaluated for the removal of copper ions using batch mode adsorption system. Characterization of the prepared nanocomposite using SEM, TEM and XRD analysis was done to check the removal efficiency before and after adsorption. This paper deals with the removal of copper from synthetic waste water using alumina/iron oxide nano composite and the increase in removal efficiency within a short period of time when it is treated with polymer coated alumina Iron/Oxide nanocomposite. The effects of pH, adsorbent dosage and time were investigated for optimum adsorption on the uptake of copper ions and observed 98 % removal. An ideal experimental response design has been carried out using Box Behnken design to evaluate the effect of different parameters in the batch mode study.
Comparative study of experimental and numerical analysis of fluid parameter around tall buildings
Authors: Nair Sreelakshmi K , Thowsif Mohammed 
Published: July 2020

Abstract
The rapid growth of the urban population and the consequent pressure of limited space have influenced city residential developments, which ultimately resulted in the sudden sprouting of tall and vertical structures. The structural system of present day has become less stiff and lighter than earlier, hence are usually more sensitive to the effect of lateral loads acting on it, especially wind loads. Inorder to ensure serviceability of the structure, the analysis and design must be carried out efficiently. From being termed a simple static drag force, wind force gained new dimension taking into consideration the dynamic aspects, thus demanding more attention in structural analysis and design. This paper deals with the comparative study of fluid parameters around tall structures when subjected to the traditional experimental analysis by Wind Tunnel test and the most modern approach of numerical simulation using Computational Fluid Dynamics (CFD). The comparison of result obtained via both of the above-mentioned approach and the further extend of possibilities in adopting CFD is also discussed.
Study on adsorption of phenol by modified montmorillonite
Authors: Zong J P , Qu Y F 
Published: July 2020

Abstract
Organic montmorillonite was prepared from montmorillonite and cetyltrimethylammonium bromide. The absorption of phenol under different condition of time, temperature and initial concentration of phenol was measured with montmorillonite, organic montmorillonite and bentonite as raw materials. Experimental results indicated that organic montmorillonite was the best adsorbent for phenol among the three raw materials, followed by montmorillonite. And the adsorption effect of bentonite was the worst. The results also showed that the optimal conditions for adsorption were 25 °C and two hours. And montmorillonite was suitable for the absorption of high concentrations of phenol. Compared with the infrared spectra of organic montmorillonite before and after adsorption, no new chemical bonds were formed in organic montmorillonite. The organic montmorillonite only absorbed phenol in the form of physical adsorption.
Ventilation Pipeline Safety Early Warning System Based on Pipe Wall Vibration and Sound Wave
Authors: Zhang Yingchun , Shi Jian 
Published: July 2020

Abstract
Due to the limitation of working conditions and working environment, the ventilation pipeline safety monitoring system in an underground laboratory is facing the technical difficulties of high wind speed and high background noise. In order to effectively guarantee the safe operation of fresh air system, an abnormal early warning method for pipeline operation based on pipe wall vibration and acoustic wave is proposed, which can realize the monitoring and location of pipeline resonance and other safety incidents.
Research on Marine Radar Image Processing Method in Sea Ice Information Extraction Process
Authors: Li Ying , Gao Pengju , Chen Duo 
Published: July 2020

Abstract
Firstly, the effectiveness of sea ice information extraction research with navigation radar is proposed. Different methods of image pre-processing are used for different sea ice information elements, and then the functions and characteristics of various processing methods are respectively summarized. The above processing methods, while taking advantage of the convenience of obtaining image data by shipborne navigation radar, can successfully process the radar image through MATLAB and provide a basis for the next extraction of sea ice information and further expansion of research on sea ice monitoring by marine radar.
Improving Land Vehicle Gravimetry Using a New SINS/GNSS/VEL Method
Authors: Yu Ruihang , Qiu Xiaotian , Cao Juliang , Cai Shaokun , Lu Shuhai , Xu Xiao , Wang Lin 
Published: July 2020

Abstract
GNSS plays a key role in land vehicle gravimetry. However, GNSS is unstable due to the influence of the observation environment, which adversely affects the gravimetry accuracy. The velometer can get rid of the restrictions on the use of GNSS by land vehicle gravimetry. In this paper, a SINS/GNSS/VEL method is proposed. This method uses both centralized filtering and federated filtering methods to process the gravity data. Based on the SGA-WZ02 strapdown gravimeter developed by the National University of Defense Technology (NUDT), the vehicle gravimetry test was carried out on a road of approximately 37 kilometers in east Changsha. The test consists of 4 lines in the south-north direction with an average speed of 40 km/h. Compared with traditional SINS/GNSS method, the accuracy of repeated lines using the centralized filtering method improves from 1.58mGal to 1.37mGal, and the external accuracy improves from 2.31mGal to 2.19mGal with a resolution of 2 km. Using federal filtering method, the internal accuracy is 1.36mGal and the external accuracy is 2.22mGal. It indicates that these two methods proposed could both improve the accuracy of gravimetry compared with the traditional SINS/GNSS method. Meanwhile, with adding the external sensor observation, these methods can improve the stability of gravimetry especially for practical survey operations that will save cost and improve efficiency. Finally, several discussions are proposed on the applicability and further improvement of the method.
Research of Extreme Precipitation Variation in Shanxi Based on R / S Analysis
Authors: shaoxiong Xu , jingbo Zhao , Duzhuoqun  
Published: July 2020

Abstract
In this paper, the daily precipitation observation data collected from 21 meteorological stations in Shanxi Province from 1958 to 2018 by China meteorological data network were used. The R/S analysis method and MATLAB analysiz were adopted to calculate and analyze the future trend of extreme precipitation in Shanxi Province in the past 60 years. According to the study, R/S prediction analysis show that in the last 6 decades, the indexes of changes of continuous dry period and heavy rainfall show a downward trend, the indexes of the changes of annual precipitation and heavy rain days shows an upward trend, and the indexes of the future change trend of continuous wet period, extreme heavy rainfall, rainfall intensity, daily maximum precipitation and 5-day maximum precipitation remain uncertain.
Application of MBR Technology in Schoolyard Domestic Sewage Treatment
Authors: Diao Liyue 
Published: July 2020

Abstract
This paper discusses the special features of campus sewage, and chooses more suitable sewage treatment for campus sewage. At the same time, it expounds the advantages and disadvantages of it. Compared with city sewage from industry and agriculture, campus sewage has much more characteristic content of pollutants with higher COD, SS and tiny toxic pollutants[5]. Therefore rather than using the traditional activated sludge process, MBR is more appropriate for schoolyard domestic sewage treatment for small area, stable effluent quality, good removal efficiency and little residual sludge production. Additionally, new campuses of universities are always built far away from the city centre, and the water transportation cost can be saved with a sewage treatment system in the campus. The treated water has the quality to be used as gray water for campus watering, cleaning and so on, which can also help the universities to save money. Undeniably, it also has the disadvantages of high energy consumption and cost, for it needs to update the active membrane regularly. If it is used in cities, it will be a huge financial burden for governments. But when it is used in campuses, less sewage will need less membranes, and the polluted membranes can also be used for students’ research.
Discussion on the development of ecotourism education in China’s national parks
Authors: Yang Shuhui , Duan Xiaoyu 
Published: July 2020

Abstract
Ecotourism education is the foundation for the healthy development of national park ecotourism. It guides visitors to standardize their behavior, cultivate tourists’ awareness of environmental protection, and develop the local economy. At the same time, ecotourism education also contributes to regional ecological and economic sustainability. On the basis of summarizing the existing problems of eco-tourism education in China’s national parks at this stage, this paper discusses the ways and methods to solve the problems and provides references for the development of eco-tourism education in China.
Effects of Polyacrylamide on Runoff and Sediment Characteristics of Slope in Northeast Black Soil Area
Authors: Liu Hongtao , Li Qilong , Li Qiqi , Han Yu , Cai Die 
Published: July 2020

Abstract
Soil erosion caused by hydraulic erosion has become the main driving force to destroy the ecosystem and has become a worldwide environmental problem. The effect of polyacrylamide (PAM) on slope erosion characteristics in black soil area was studied under different conditions. The method of artificial simulation of rainfall was adopted. At 4 slopes and 5 PAM concentrations, the rainfall lasted 60min and the rainfall intensity was 80mm/h. The results show that when the rainfall intensity and underlying surface conditions are the same, the slope increases from 10° to 25°, the average runoff on the slope increases first and then decreases, and the sediment yield increases with the increase of the slope. The sediment yield on the 25° slope is 1.64 times that of the 10° slope. With the same rainfall intensity and slope compared with bare land, the concentration of Polyacrylamide in 2g / m2 increased to 5g / m2, and the average yield decreased by 10.6% to 20%. The average sediment yield decreased with the increase of the concentration, which was 20.4%∼52.5% lower than that of the bare land. The variation law of PAM and bare slope sediment yield can be described by power function. Compared with the total sediment yield of PAM and bare slope, PAM is obviously decreased. The bare slope surface is mainly characterized by splash erosion and surface erosion. The application of PAM can reduce the erosion area of slope compared with bare slope, which plays an important role in corrosion prevention.
Research on Multi-directional Gas Drainage Technology in Goaf of Working Face
Authors: Qian Zhiliang 
Published: July 2020

Abstract
According to the abnormal gas overrun quadrant in the mined-out area during the initial mining and normal mining of a mine, the causes of some gas outbursts were analyzed, and the multi-directional extraction method for low-level drilling, middle-level drilling and high-level drilling was designed and constructed Successively connect and replace the mined-out gas, and the effect analysis shows that each borehole achieves and exceeds the expected effect, which improves the efficiency of gas extraction in the mined-out area and relieves the gas pressure during the normal mining of the working face.
Research on Online Shopping Return Mode in “New Retail” Era
Authors: Zhang Shubin , Zhong Fachun , Zhang Jingjun , Du Dandan , Zhao Yuhan , Yuan Miaomiao 
Published: July 2020

Abstract
Through B2C/C2C platform, online shopping has realized the simplified mode of factory—retailer—consumer. With the rapid development of online shopping and retail industry, consumers’ requirements for online shopping and retail services are gradually raising. At present, the size of the new retail market is only 38.94 billion yuan, while as the formation of user habits and the innovation of new retail mode, there is great potential for future growth. It is estimated that the total market size will reach 1.8 billion yuan in 2022. This article analyzes the reasons and existing problems of online shopping return in the “new retail” era, analyzes the logistics modes of online shopping return, self-run shopping return, the third-party return and the alliance return. This paper adopts the method of empirical research to analyze the return of online shopping.
Hazardous Materials Railway Transportation Train Selection Considering Environmental Risks
Authors: Liu Liping , Zhou Chao 
Published: July 2020

Abstract
Railway transportation of hazardous materials has the characteristics of large transportation volume, small risk probability but great harm consequence, which will not only cause important harm to population, but also cause great harm to the surrounding environment. In this paper, on the determination of the risk of railway transportation of hazardous materials, considering the dynamic environmental risk during transportation and the static risk waiting for transit point, this paper constructs a double-objective model of railway transportation train selection considering environmental and population risks based on the hazardous materials railway transportation model. Through the dimensionless processing, the trains with low risk and low transportation cost are selected. Furthermore, an illustrative example is designed for analysis and solved by CPLEX solver. The results show that the number of transfer points the train passes through will directly affect the selection about train and the relative weight of the decision-maker’s attention to the environment and population will also have a significant impact on train selection.
Elaboration of architecture of the enterprise of dairy animal breeding
Authors: Kochetkova O V , Shiryaeva E V , Arkov D P , Matveyev A S 
Published: July 2020

Abstract
The actual task of dairy enterprises is to increase the efficiency of resource use, optimize business processes, reduce water and energy consumption, deploy a reliable traceability system that improves transparency, safety and product quality, providing detailed information about the product for the consumer. The specific task for dairy farms is monitoring the behavior of cows and their maintenance in order to improve their well-being and prevent morbidity. In turn, it will lead to better enterprise management, increasing of productivity and quality of production. It is possible to solve the set of tasks only with the help of digital technologies, which are vital for achieving the competitive advantage of dairy farms. It requires the elaboration of enterprise architecture for optimizing many disparate processes in an integrated environment, which will achieve the right balance between IT efficiency and business innovation. Enterprise architecture provides a strategic context for the development of IT systems in response to the ever-changing needs of the dairy industry environment. The research presents the “As Is” model of the architecture of typical dairy farms, developed using the ArchiMate language. As a result of its analysis, the discrepancy between business and IT requirements was found. An insufficiently high level of application of digital technologies was noted, allowing only to identify animals, but not giving the opportunity to determine their condition, to signal about its change and the need for urgent measures. The insufficient level of application of digital technologies does not provide support for decision-making by employees and managing specialists, and also does not allow to monitor in real time the parameters of the conditions of the animals, the quality of the products, the preparation of balanced feed and their individual dosing, automatic milking, storage, sorting and packaging products. The conducted studies are the basis for the creation of the standard architecture “To be” of dairy farms using modern digital technology and sensor systems for providing high quality and efficiency of production of dairy products.