bluuebunny/crossref_metadata_2025 huggingface dataset:
Sweet potato: agronomy.
Authors: Lebot V.
Published: December 2019

This chapter focuses on the effects of various seed systems and propagule selection methods, soil preparation techniques, crop densities and establishment, intercropping, weeding, fertilizer application and harvesting systems on the agronomic characteristics of sweet potatoes. Some nutrition-related disorders of sweet potato and their mitigation are also presented.
Sweet potato: pests and diseases.
Authors: Lebot V.
Published: December 2019

This chapter focuses on insect pests, plant parasitic nematodes, plant diseases caused by bacteria, fungi, and viruses, and their integrated control in sweet potatoes.
Yams: breeding and genetics.
Authors: Lebot V.
Published: December 2019

This chapter focuses on the selection criteria, sexual reproduction, sterility, crossing techniques, seed production, heritability, genotype × environment interactions, polyploidy breeding, molecular markers, transgenic technologies, and germplasm conservation of yams.
Yams: developmental physiology.
Authors: Lebot V.
Published: December 2019

This chapter focuses on the growth cycle, photoperiodism, temperature, plant nutrition, water deficit and stress, and climate change adaptation of yams.
Yams: pests and diseases.
Authors: Lebot V.
Published: December 2019

This chapter focuses on insect pests, plant parasitic nematodes, plant diseases caused by bacteria, fungi, and viruses, and their integrated control in yams.
Aroids: pests and diseases.
Authors: Lebot V.
Published: December 2019

Aroids (Alocasia, Amorphophallus, Colocasia, Cyrtosperma and Xanthosoma) are fairly robust plants with leathery leaves, which are difficult for most insects to chew. As a group, they are often left to grow without pesticides and still manage to produce significant yields. There are, however, several pests and diseases which deserve attention, especially in intensive, commercial production. This chapter describes the major pests (insects, snails, nematodes) and diseases (caused by bacteria, fungi and viruses) of aroids, and their control measures, including the integrated management technique.
Investigation of Deformation in Bimorph Piezoelectric Actuator: Analytical, Numerical and Experimental Approach
Authors: Ali Ahsan , Pasha Riffat Asim , Elahi Hassan , Sheeraz Muhammad Abdullah , Bibi Saima , Hassan Zain Ul , Eugeni Marco , Gaudenzi Paolo
Published: December 2019

Piezoelectric actuators are widely used in many fields such as medical instruments, optics, and aerospace due to their small size and high reliability. Piezoelectric cantilever actuators are used in different configurations such as unimorph and bimorph. In this paper, a 3-D lead zirconate
titanate (PZT) bimorph was modeled in COMSOL Multiphysics software for investigation of series and parallel configuration. Theoretical analysis has been developed for the measurement of deformation of a piezoelectric cantilever in inverse piezoelectric effect. The experiment was also performed
to examine the deformation of piezoelectric bimorph cantilever. It is found that under a constant applied electric field of 100 V bimorph piezoelectric actuator produces maximum deformation at 100 mm length, 30 mm width, and 20 mm thickness. It is also found that
piezoelectric series benders have relatively less deformation than piezoelectric parallel benders. Experimental results show good agreement with theoretical and Numerical results.
The Study of the Morphology and Dielectric Properties of PVC + TiO2-Based Nanocomposites
Authors: Ramazanov M. A. , Rahimli A. M.
Published: December 2019

In given work, PVC + TiO2-based nanocomposites were synthesized and their structure and dielectric properties were investigated. SEM analysis of samples was performed to determine the distribution of nanoparticles in the polymer matrix. It was pointed out that
the nanoparticles play the role of structure nucleation centers when they are distributed in the polymer matrix in small quantities. As the concentration of particles increases, changes in the supramolecular structure of the polymer occurs, as well as the agglomeration of nanoparticles in
the matrix, which leads to an increase in their size. The Fourier transform infrared spectroscopy (FTIR) measurements for pure polymer and nanocomposites were carried out. It has been determined that, as the concentration of TiO2 nanoparticles increases, there is no change in the
chemical structure of the polymer and only decreases the intensity of the maxima of the spectra. It has been shown that polymer matrix is only physically interacted with the nanoparticles and does not form any chemical bond with nanoparticles. It has also been established that the increase
in the percentage of TiO2 nanoparticles in the polymer has increased the dielectric permittivity of nanocomposites and it has started to decline at a certain concentration.
FG-nucleoporins caught in the act of liquid–liquid phase separation
Authors: Dormann Dorothee
Published: December 2019

The interior of nuclear pore complexes (NPCs) is densely filled with FG-nucleoporins that form a permeability barrier of a still-obscure nature. Celetti et al. (2019. J. Cell Biol.https://doi.org/10.1083/jcb.201907157) now reveal that FG-nucleoporins can undergo liquid–liquid phase separation and form liquid droplets that mimic permeability barrier properties of intact NPCs.
Three-Party Quantum Key Agreement Protocol Based on Continuous Variable Single-Mode Squeezed States*
Authors: Zhou Yi-Hua , Tan Jing , Zhang Jing , Shi Wei-Min , Yang Yu-Guang
Published: December 2019

The difficulty of quantum key agreement is to realize its security and fairness at the same time. This paper presents a new three-party quantum key agreement protocol based on continuous variable single-mode squeezed state. The three parties participating in the agreement are peer entities, making same contributions to the final key. Any one or two participants of the agreement cannot determine the shared key separately. The security analysis shows that the proposed protocol can resist both external and internal attacks.
Periodic Orbits Around Kerr Sen Black Holes*
Authors: Liu Chang-Qing , Ding Chi-Kun , Jing Ji-Liang
Published: December 2019

We investigate periodic orbits and zoom-whirl behaviors around a Kerr Sen black hole with a rational number q in terms of three integers (z,w,v), from which one can immediately read off the number of leaves (or zooms), the ordering of the leaves, and the number of whirls. The characteristic of zoom-whirl periodic orbits is the precession of multi-leaf orbits in the strong-field regime. This feature is analogous to the counterpart in the Kerr space-time. Finally, we analyze the impact of the charge parameter b on the zoom-whirl periodic orbits. Compared to the periodic orbits around the Kerr black hole, it is found that typically lower energies are required for the same orbits in the Kerr Sen black hole.
Magnetohydrodynamic Stagnation Point Flow of a Maxwell Nanofluid with Variable Conductivity
Authors: Irfan M. , Khan M. , Khan W. A. , Alghamdi M.
Published: December 2019

This article reports the simultaneous properties of variable conductivity and chemical reaction in stagnation point flow of magneto Maxwell nanofluid. The Buongiorno’s theory has been established to picture the inducement of Brownian and thermophrotic diffusions effects. Additionally, the aspect of heat sink/source is reported. The homotopic analysis method (HAM) has been worked out for the solution of nonlinear ODEs. The behavior of inferential variables on the velocity, temperature, concentration and local Nusselt number for Maxwell nanofluid are sketched and discussed. The attained outcomes specify that both the temperature and concentration of Maxwell fluid display analogous behavior, while the depiction of Brownian motion is quite conflicting on both temperature and concentration fields. It is further noted that the influence of variable thermal conductivity on temperature field is similar to that of Brownian motion parameter. Moreover, for the confirmation of our study comparison tables are reported.
Engineering nodal topological phases in Ising superconductors by magnetic superstructures
Authors: Głodzik Szczepan , Ojanen Teemu
Published: December 2019

Recently it was discovered that superconductivity in transition metal dichalcogenides (TMDs) is strongly affected by an out-of-plane spin–orbit coupling. In addition, new techniques of fabricating 2d ferromagnets on van der Waals materials are rapidly emerging. Combining these breakthroughs, we propose a realization of nodal topological superconductivity in TMDs by fabricating nanostructured ferromagnets with an in-plane magnetization on the top surface. The proposed procedure does not require application of external magnetic fields and applies to monolayer and multilayer (bulk) systems. The signatures of the topological phase include Majorana flat bandsthat can be directly observed by scanning tunneling microscopy techniques. We concentrate on NbSe2 and argue that the proposed structures demonstrating the nodal topological phase can be realized within existing technology.
CFD-based fire spread visualization for improvement of road tunnel safety
Authors: Glasa J , Valasek L , Weisenpacher P
Published: December 2019

Teaching and training of operators of road and highway tunnels are necessary to increase their preparedness for incidents accompanied by fire and ensure safe tunnel operation. For such purposes Tunnel Traffic & Operation Simulator (TTOS) is used in Slovakia. TTOS is capable to simulate various types of emergency situations in 1 km long twin tube virtual highway tunnel with longitudinal ventilation including scenarios of car accidents accompanied by fire. However, TTOS does not provide information about the fire dynamics and smoke stratification. In this paper, the use of the well-known CFD-based Fire Dynamics Simulator for creating a series of didactic videos is illustrated. The videos demonstrate the smoke propagation and time evolution of temperature, air flow velocity and visibility for selected fire scenarios. They have been implemented into the TTOS environment and became available for tunnel operators.
Numerical Simulation of Non-Equilibrium Isochoric Phase Transitions in Hydrocarbon Mixtures
Authors: Aglyamova A I , Indrupskiy I M
Published: December 2019

Numerical simulations of phase behavior in multicomponent hydrocarbon mixtures is an essential part of petroleum reservoir engineering practice. Almost all industry-adopted models are based on equilibrium assumptions. The condition of Gibbs energy minimum, or equality of chemical potentials, combined with the equation of state (EoS), e.g. the Peng-Robinson EoS, for each phase and with balance conditions for concentrations are used to compute phase mole fractions and compositions (component concentrations in the phases). However, experimental and field data show that in a number of important real situations equilibrium assumptions are not valid. In the previous study of Indrupskiy et al. (Computational Geosciences, 21(5), 2017) a unified model and numerical algorithms were presented for isothermal non-equilibrium phase behavior simulations in petroleum engineering applications. The model is based on the relaxation equation for the component chemical potentials difference between phases. It was verified on field data; however, only integral behavior of the system (a gas-condensate reservoir) was available to be matched. In the current study, we extended the non-equilibrium model to isochoric processes and developed a numerical algorithm which allowed to perform direct simulation of laboratory experiments with a multicomponent hydrocarbon mixture and validate the non-equilibrium model. The experimental data were successfully matched with the model simulations. The model and algorithm are suitable for equilibrium and non-equilibrium isochoric phase behavior simulations with synthetic and real multicomponent hydrocarbon mixtures (oils and gas-condensates).
Case study in which the Deutsch-Jozsa algorithm responds with pure states
Authors: Marinho Eraldo P.
Published: December 2019

A theoretical essay is presented on a particular type of balanced functions that allow the Deutsch-Jozsa algorithm to produce pure state instead of mixed states. Such results occur if and only if the balanced functions are linear combinations (modulo 2) of a set of balanced clock functions, that is, clock functions with periods that are power of 2.
Pole representation of the dislocation segment generalized susceptibility diagonal matrix elements
Authors: Bataronov I L , Dezhin V V
Published: December 2019

Diagonal elements of the generalized susceptibility matrix in the form of expansion in a series of poles are presented. Screw dislocation segment considered. The calculation of the series coefficients for different values of the dislocation segment normalized lengths has been carried out. The real and imaginary parts of the diagonal matrix elements are calculated. The results of the calculations are presented in the figures. The figures show a good agreement of the diagonal matrix elements direct calculation results with the calculation carried out in this work.
The SAPBC Method on local, non-Cluster updates algorithms of Monte Carlo simulation: A study on more convergence of spin correlation at critical temperature.
Authors: Najafi Amin
Published: December 2019

In this method, we propose computational technique of Screw-Antisymmetric Periodic Boundary Condition (SAPBC Method) on local, non-cluster update algorithms of Isotropic square lattice Ising model of Monte Carlo simulations, as well. The SAPBC Method, actually, is an extended mixed method of Screw (helical) and Antisymmetric periodic boundary conditions beyond connection from of nearest neighbor spin of the main lattice to even far away block of the outer (foreign) neighbor spin arrays. Here, meanwhile of description of geometry exact details of method and way of spin interaction, have applied to critical slowing down in order to achieve more convergence of spin correlation at critical temperature. Actually, in general, at critical temperature algorithms performed by using SAPBC Method have faster correlation and much shorter autocorrelation time than algorithms performed by using PBC Method. We will also see that autocorrelation function for the typewriter Metropolis algorithm was found to be zero at high temperatures. For low temperatures it fell to zero and stayed there. The SAPBC Method also confirms and consists with the law of the spatial correlation length with its dynamical critical exponent. Therefore, it can be used as a trenchant method applied to boundary conditions of Monte Carlo simulation problems extending on a variety of other models such as XY-Pots-Heisenberg model and also cluster algorithms such as Wolf, Swendsen-Wangas, Hoshen-Koppelman as well.
Remarkable effects of dirty limit on superconducting condensate
Authors: González J E , Durán F , González J D
Published: December 2019

Using heterostructures that combine a two superconductor (Nb-Pb). We demonstrate the modulation of the superconducting condensate at the nanoscale via variation of mean-free path. The modulation of superconductivity can be obtained not only for chosing smaller superconducting lengths comparing with bulk superconducting length or considering several geometric shapes, but also whether strong local dopping effect can be produced over the superficial area of the superconductor. Through this mechanism, a nanoscale pattern of two condensates regions can be created in the superconductor. This yields a magenetization curves that has no counterpart in the literature. We show that this form of modulation based on the possibity of change mean-free path represent a groundbreaking prospects in the study of the effects that might exploit unique superconducting properties, due to allows the manipulation of magnetic flux quanta.
Cosmological model of F (T) gravity with fermion fields via Noether symmetry
Authors: Myrzakulov Nurgissa , Bekov Sabit , Myrzakulova Shamshyrak , Myrzakulov Ratbay
Published: December 2019

In this article, we investigate the modified F (T ) gravity, which is non-minimally coupled with the Dirac (fermion) field in Friedmann-Robertson-Walker space-time. Point-like Lagrangian is derived and modified Friedmann equations and Dirac equations for the fermion field are obtained by using the Lagrange multiplier. The Noether symmetry method related to differential equations is a useful tool for studying conserved quantities. In addition, this method is very useful for determining the unknown functions that exist in the point-like Lagrangian. Using this method, the form of the coupling between gravity and matter, the self-consistent potential, the symmetry generators, the form of F (T ) gravity and the first integral (Noether charge) or a conserved quantity for this model are determined. Cosmological solutions that have a power-law form and describe the late time accelerated expansion of the Universe are obtained.
Flood estimation for Zhabay River Basin in Akmola region
Authors: Rakhimzhanov B.K. , Murat A. , Shaikhova G.N.
Published: December 2019

The aim of the study is to carry out the flood frequency analysis of the Zhabay River Basin in the Akmola region. Powell probability distribution was employed for simulating the future flood discharge scenarios using annual peak flow data (2011–2018) from the gauging station of the Zhabay River. The predicted design floods of various return periods (T) i.e., 2, 2.33, 5, 10, 20, 50, 100, 200, 250, 500 and 1000 were obtained.
Homogenization of the elasticity problem with periodically located cracks
Authors: Egorova Alena A. , Neustroeva Natalia V. , Afanaseva Nadezhda M.
Published: December 2019

In this paper we study the nonlinear problem of elasticity with periodically located cracks. On the edges of these cracks non-penetration conditions are given, which leads to a variational inequality. The period of distribution of cracks, as well as their sizes, depends on the small parameter.

In this work the corresponding varational problem and its homogenized problems are presented. We derive the necessary estimates for the theorem about convergence of the solutions of the variational inequality to the solution of the homogenised problem. For the first corrector of the classical asymptotic expansion we construct a penalty equation and a linear iterative equation in integral form. The convergence theorems for corresponding problems are formulated.
Fostering mathematical logical intelligence in primary school students
Authors: Patiño R A Márquez , Pérez H J Gallardo , Ortega M Vergel
Published: December 2019

Education must form thinking people, who develop all their potentialities, among them, those referring to mathematical logical intelligence. The objective is to elaborate a didactic proposal that fosters mathematical logical intelligence in students. For this, the research was framed in a quantitative approach with fieldwork design and at a descriptive level. The survey was applied as a technique and as instruments a questionnaire for teachers and a test for students. The population was made up of all teachers and students in basic primary education. An intentional non-probability sample was applied, made up of 22 teachers who attend primary school programs and 30 students of the same educational level. The results identify the lack of strategies related to the processes of classification, serialization, and number of primary school teachers during their pedagogical work. Next, we describe the shortcomings that students have in applying mathematical logic processes in a series of activities proposed in the evaluative test. Finally, didactic strategies are defined according to the conditions of the learning environment analyzed so that from the work of the classroom it is possible to promote logical mathematical intelligence, since cognitive stimulation in the student by means of learning experiences according to the level of development allows to reach levels of thought of greater complexity.
Lean six sigmas in academic processes
Authors: Rojas-Suarez J P , Gómez-Colmenares C , Vergel-Ortega M
Published: December 2019

The objective of the research was to analyse the influence of the Lean Six Sigma management strategy on the process management of the master in mathematical education of the Universidad Francisco de Paula Santander, San José de Cúcuta, Colombia. The research follows a quantitative approach of field type correlational level. For the analysis and interpretation of the information, tools of diagramming, process mapping, descriptive and multivariate analysis, hierarchical, capacity studies, analysis of measurement systems, design of experiments, error tests and control charts were used. Once the lean six sigma philosophy is implemented, continuous improvement is observed, improvements in process capacity, 99.9% effectiveness in measurement variables, improvement in perceptions of the academic and administrative community, and process standardization, the impact of the application of Lean six sigma in a program is evaluated, demonstrating an efficient flow of its products and processes.
Interest rates calculation in certain ordinary annuities
Authors: Flórez M , Vera M , Salazar-Torres J , Huérfano Y , Gelvez-Almeida E , Valbuena O , Vera M I , Aranguen M
Published: December 2019

Certain annuities are annuities whose payments occur on fixed dates; while a certain ordinary annuity is one in which payments are made at the end of each established period. The calculation of the interest rate, which governs the certain ordinary annuity, involves the use of a non-analytical equation that requires the application of numerical techniques to obtain the value of the aforementioned rate. The literature indicates that any of these techniques requires one or several numerical values for initialization, which generally are estimated using trial techniques, graphical methods or values present in pre-established tables. Through this article, a new robust methodology is proposed that calculates the useful numerical values to initialize the linear interpolation technique, which is used to calculate the interest rate linked to the certain ordinary annuity. The proposed methodology generates initialization values, one by default and the other by excess, which allow us to limit the value of the certain ordinary annuity interest rate considered. Finally, we generated a new strategy that constitutes a novel mathematical model for interest rates calculation in the context of certain ordinary annuity. The percentage relative error obtained indicates the excellent performance of the aforementioned mathematical model.
Newton-Raphson method initialization for non-analytical equations solution linked to anticipated annuities
Authors: Vera M , Flórez M , Salazar-Torres J , Huérfano Y , Gelvez-Almeida E , Valbuena O , Vera M I , Aranguen M
Published: December 2019

The series of payments made in equal intervals of time is known, in the world of financial mathematics, as an annuity. An anticipated annuity is one whose periodic payment expires at the beginning of the established payment interval. The non-analytical equation that allows us to calculate the interest rate, linked to the anticipated annuity, can be solved using several numerical methods, in particular, the numerical method called Newton-Rhapson. The main problem with this method is its initialization, which requires of one starting point that, usually, is estimated without any scientific background or using random or arbitraries mechanisms. In order to address this problem, in this paper, we establish as main objective to demonstrate that the Newton-Rhapson method can be initialized using only the data, of an anticipated annuity, identified as capital, income and payment intervals without the need to use the initialization strategies, reported in the literature. Through this article, a strategy is presented that allow us to calculate the value of the AA interest rate using the MNR. The value of the error generated for the problematic considered in order to assess the quality of the work performed, is a clear indicator of the good performance of the proposed strategy. This strategy for obtaining the starting point of the aforementioned numerical method is useful in the financial mathematical context, for example, when is necessary the interest rate calculation.
Communications skills from methodology creative and model of the united nations
Authors: Leal O L Rincón , Leal J F Rincón , Ortega M Vergel
Published: December 2019

this article is result of the research which main objective was analyzed factors and influence of methodology creative and nations united model in the development of abilities in communication of the students of the ninth grade. the methodology incorporates writing texts, set ups, and descriptive researches. The investigation was oriented quantitative focus with an analysis technique of multiple results factorial, identified profiles of students with character of leaders; the sample incorporated 150 students of educational institutions in Norte de Santander-Colombia. The results allow us to observe four factors associated with communicative skills: pragmatic, with the practice skills for the readings production; factor normative, belongs to etic based parameters, factor diplomatic negotiator, skill to intercede in conflicts and factor communicative in assign tasks to groups and planning. Apply the methodology denominated creative and United Nations model, developed and enhance political communications skills, democratic, of planning communicative and ethical.
Space-occupying lesions identification in mammary glands using a mixed computational strategy
Authors: Vargas S , Vera M I , Vera M , Salazar-Torres J , Huérfano Y , Valbuena O , Gelvez-Almeida E
Published: December 2019

The mammary pathology can manifest itself in multiple ways and originates space-occupying lesions. The breast cancer is a space-occupying lesion, which is highly prevalent, especially in women, and worldwide it is one of the leading causes of morbidity and mortality in this population. The main image modality for breast cancer detection is the magnetic resonance but this kind of image modality introduces several imperfections that affect the image quality. Some of these imperfections or problems are: inhomogeneity in the anatomical structures, riccian noise and artifacts. These problems make the analysis of the image information a real challenge. To address these problems, in this paper, we propose a computational technique able to extract a space-occupying lesion linked to breast cancer, present in magnetic resonance images. For this, the original image is processed with statistical-arithmetic filters and segmentation algorithms based on thresholding and multi-seed region growing techniques. The results, based on Dice score, show that the proposed technique is suitable for segmenting the breast cancer due high correlation between semi-automatic and manual segmentations. This technique can be useful in the detection, characterization and monitoring of this type of cancer and it can let to medical doctors to realize their work more efficiently.
Change of Soil Erosion Characteristic under Different Vegetation
Authors: Zhenzhou Shen , Wenyi Yao , Guoqiang Yu , Peiqing Xiao , zhaoyue Li , Ma Zhilin , Chengran Jing
Published: December 2019

The runoff amount, soil erosion amount and infiltration rate were analyzed on different rainfall and different underlying horizon in base of yellow river institute of hydraulic research at 2018. The date shows: the runoff amount of bare slope is 7 times that of grass slope, the runoff amount of heavy rainfall is 2 times that of middle rainfall and is 20 times that of small rainfall; the soil erosion amount of bare slope and arable slope is 100 times that of grass slope; the steady soil erosion amount of small rainfall is 1/4 times that of middle rainfall and is 1/30 times that of heavy rainfall on grass slope; the infiltration rate of bare slope and arable slope is 1/3 times of grass slope; the grass slope infiltration rate is about 0.6mm/min in small rainfall, the middle and heavy rainfall get the steady infiltration rate at experiment continue 30min and 12min.
Research on Quality Control in Food Physical and Chemical Testing
Authors: Lihua Zhang
Published: December 2019

Food physical and chemical testing is the use of physical and chemical means to test the quality of food, is an important means of food quality and safety control. Nowadays, China’s food quality and safety issues are more serious, food insecurity incidents occur frequently, which poses a greater threat to consumers’ health and life safety. All relevant departments should pay more attention to food quality and safety. In the process of physical and chemical testing of food, many interference factors, such as environmental factors, human factors, reagent purity, instrument accuracy and experimental method selection, will have adverse effects on food inspection results, affecting the accuracy of data. In the process of physical and chemical testing of food, these interference factors should be strictly controlled to ensure the accuracy of the test results. In this paper, the author will analyze and discuss the means of quality control in the process of physical and chemical testing of food, in order to provide reference for relevant people and improve together. The quality of food physical and chemical testing ensures food safety.
A Modified Double Yield Surface Model of Frozen Soil Considering Particle Breakage
Authors: Luo Fei , Guo Fang Yan , Cai Siwen , Liu Yuxin , Wei Wei , Ji Lin
Published: December 2019

As a basic phenomenon of granular materials under high stress conditions, particle breakage has an important influence on the strength and stress-strain relationship of materials. It is generally believed that that frozen soil undergoes significant particle breakage during the triaxial shearing process. Based on original double yield surface model, a modified double yield surface constitutive model which considered particle breakage has been proposed. Compared with the experimental data, the proposed double yield surface model can describe its strain softening characteristics, dilatancy, elastoplasticity and particle breakage characteristics.
Research on the pore water pressure of submerged dike structure
Authors: Liu Wenbin , Zhao Yan
Published: December 2019

This paper analyzed the pore water pressure feature of deep water submerged dike structure in waterway section based on in-site tests. The pore water pressure was recorded and a law of the pore water pressuredevelopment was clarified.
Design of dust monitoring system in coal mine
Authors: Yuyuan Du , Renci Zhao , Changlong Jiang , Shoufeng Tang , Minming Tong
Published: December 2019

Coal dust is one of the main factors affecting the safety of coal mine production and the life and health of workers. In order to accurately and efficiently monitor the coal dust generated in the production process, the measurement system is designed and the non-contact dual-light proportional difference detection method is adopted. Through calculation and simulation, the parameters of the key link are calculated, and the on-line concentration monitoring system, which is suitable for wide field and wide measurement range is designed. Experimental data show that the reliability and accuracy of the measurement system meet the design requirements.
Research on Leaching Rehabilltation of Heavy metal Contaminated Soil
Authors: Fang F. , Cui S. , Zhang Q. K. , Song J. H. , Jiang C. J.
Published: December 2019

With the development of heavy industry, the problem of soil contaminated by heavy metals has become increasingly prominent. Therefore, it is of great significance to find an efficient method to treat soil contaminated by heavy metals. Soil leaching technology is a common technology to remediate contaminated soil by chemical principles. The specific operation is to inject chemical solvents, such as inorganic eluents, complexing agents and surfactants, which can promote the dissolution or migration of soil pollutants into the contaminated soil, so as to dissolve, separate and treat the pollutants from the soil. It has the advantages of good repair effect and short repair cycle, and has attracted wide attention. In this paper, the sources of heavy metal contaminated soil, the existing soil remediation technology, and the research progress of heavy metal contaminated soil leaching remediation technology are discussed. It is hoped that this paper can provide reference for the remediation of heavy metal contaminated soil.
Focus on the investment of Waste Incineration in China—Based on PEST-SWOT analysis
Authors: Li Yun , Zhao Min
Published: December 2019

Due to the rapid development of economy and the increase of population, the number of municipal solid waste in China is increasing, and the harmless disposal of waste is the urgent problem to be solved. The paper use PEST-SWOT model to analyze the investment environment of waste incinera-tion power generation industry. Also it analyzed the investment environment of waste incineration power generation industry from four aspects of policy, economy, society and technology, and point out the opportunities, threats, strengths and weaknesses of it, which can provide the reference for inventors. Based on the analysis, the paper put forward corresponding policy recommendations. It has far-reaching significance for the healthy development of waste incineration power generation industry in China.
Investigation and Diversity Analysis of White Rot Fungus Resources in Xian-weng Mountain National Forest Park in Yichun
Authors: Zhang Yuehua , Wang Xue , Miao Tianlin , Wang Changbao
Published: December 2019

The diversity of white rot fungi in Xian-weng Mountain National Forest Park was investigated by randomized method and key area sampling survey method. According to apparent characteristics, living habits and structural analysis, comparative literature and expert consultation were used. The collected white rot fungi specimens were classified and identified. The white rot fungi are abundant in the Xian-weng Mountain National Forest Park, mostly distributed in broad-leaved forests, followed by mixed forests and coniferous forests. The white rot fungi in Xian-weng Mountain National Forest Park has good development and application prospects.
Noise Reduction of the Ecological Sound Barrier
Authors: Huang Shufang , Yuan Minmin , Zhao Ming , Shang Xiaodong , Wei Xianwei
Published: December 2019

In China, harmonious environmental protection is more important and advocate in main position today. Building ecological noise barrier can not only reduce environment noise effect, but also better integrate with the environment along the traffic. This paper investigated the typical ecological noise barrier built in China highway, and measured the noise reduction on the site. Combined with the idea of green road construction, proposed the development trend of ecological noise barrier and provided the reference for the noise reduction in the transportation industry.
Noise Control Methods and Countermeasures in Traffic Infrastructure Reconstruction and Expansion
Authors: Huang Shufang , Liu Huan , Sun Zhiqiang , Wang Yanqin , Yuan Minmin
Published: December 2019

With the rapid development of the national economy, the reconstruction and expansion of traffic infrastructure has been growing, and new types of traffic noise have appeared. Based on the measurement and analysis of the noise contribution of traffic infrastructure reconstruction and expansion, combined with the propagation characteristics and distribution characteristics of traffic noise, this paper proposes methods and countermeasures to control the contribution of traffic noise, so as to reduce the Incremental noise effect caused by the reconstruction and expansion of traffic infrastructure.
Study on the formation mechanism of the landslide in the old cellar in Wanzhou
Authors: Hu Ting , Zhang Jinhao
Published: December 2019

The natural geological conditions in the Three Gorges Reservoir Area are complex, which are the frequent and severe geological hazards in China. With the operation of reservoirs, the occurrence of geological hazards is aggravated. This not only causes great loss of life and property, but also destroys the geological environment and hinders the sustainable development of regional economy. Since the formation of Laojiaolin landslide in Wanzhou District, there have been many landslides and deformations, and the landslide body is densely populated and houses are dense. Deformation bodies often cause cracks and dislocations of main road facilities and residential buildings, triggered by extreme rainstorms, floods and other factors, which can cause sustained and rapid deformations, which will directly promote the inclination of residential buildings. The collapse has resulted in major disasters and accidents, which have posed a serious threat to the lives and property safety of the people in the region. It is of great practical significance to study the formation mechanism of landslides.
Design and operation effect of corn starch wastewater treatment project
Authors: Hong Wei , Zhang Zengguo , Liang Shihua , Hong Guangbo , Jin Xiaopei , Zhuang Huidong , Li hua , Yu Changwei , Chen Huihui
Published: December 2019

The corn starch wastewater was treated by the combination of “IC anaerobic + two-stage AO biochemical + modified Fenton”. The design parameters and treatment effects of the main construction sections of the project were introduced. The operation results of the project show that the combined process has a good treatment effect on corn starch wastewater. In the case where the average concentration of COD in the influent water is 17640 mg/L, the average concentration of NH3-N is 91.1 mg/L, and the average concentration of TN is 1266 mg/L. The average concentration of the COD, NH3-N and TN in the effluent water after treatment are 36mg/L, 1.2mg/L and 11.6mg/L, respectively, which meets the design standard requirements. The process control method of using some high-concentration organic wastewater beyond the anaerobic section can achieve the standard treatment of total nitrogen without the need of external supplementary carbon source, which has significant economic benefits.
Evaluation on Utilization Effect of Highway Wildlife Corridor in Desert and Gobi Area
Authors: Zhou Gang , Shao Shegang , Wu Xiaomin , Zhu Yufeng , Zhang Hongfeng , Wang Zhaoming
Published: December 2019

Taking the design of wildlife corridor from Mingshui to Hami section of national expressway from Beijing to Urumqi as an example. From January 2015 to May 2018, the project team monitored and studied the wildlife utilization of 13 corridors along the route from Mingshui to Hami. The results show that wildlife along the highway has begun to use Bridges, culverts and passageways to cross the highway.
Sequestration of inorganic carbon in groundwater of arid saline-alkali area
Authors: Yu Junxia , Jiao Yan , Liu Lijia , Yu Yaze , Song Chunni
Published: December 2019

It has been reported that the saline/alkaline groundwater aquifer is a potentially large active inorganic carbon pool. This paper reviews the formation mechanism and the carbon storage path of inorganic carbon in groundwater of arid saline-alkali area. The geochemical carbon sequestration processes (CO2-water-rock interaction and mineral capture) known as the “capture-rereaction” model, are considered to be the most effective means of long-term CO2 storage, since the saline aquifers are covered with thick saline-alkali soils, once CO2 is involved in rock weathering or mineralization, it will become a part of the geological structure that can hardly be released again. This review provides an important reference for the carbon sequestration mechanism of arid underground saline-alkali aquifers, and is helpful for the estimation of regional carbon balance and the mitigation of Greenhouse Effect.
Short time PM2.5 prediction model for Beijing-Tianjin-Hebei region based on Generalized Space Time Autoregressive (GSTAR)
Authors: Hu Jinghao , Wang Shandong , Mao Jian
Published: December 2019

In recent years, with the rapid development of China’s economy and urbanization, the irrational industrial structure, large energy consumption, and increased car ownership have made China’s air pollution increasingly serious, especially in Beijing-Tianjin-Hebei, Yangtze River Delta, and the Pearl River Delta. As the primary pollutant affecting the air quality in the Beijing-Tianjin-Hebei region, the accurate prediction of PM2.5 concentration is of great significance for predicting heavy pollution weather, formulating the start-up mechanism of emergency plan and optimizing the production of enterprises. This study used the online hourly data of conventional pollutants from 80 national control stations in Beijing, Tianjin and Hebei from May 1, 2015 to May 31, 2019. Considering the influence of time and space, the GSTAR model of PM2.5 prediction is established. Comparing the prediction results of GSTAR model with ARMA and STAR, the validity of GSTAR model is verified by applying relevant accuracy evaluation indicators.
Chromosomal Karyotype Differences of the Dark-Purple Tea Cultivar ‘Ziyan’ and Its Natural Hybrid Progenies
Authors: Jin Zhen , Sun Bo , Huang Jiacheng , Tan Liqiang , Tang Qian
Published: December 2019

‘Ziyan’ is a new variety of dark purple tender shoots tea tree which is rich in anthocyanins. ZY-1 and ZY-3 were two natural hybridized offspring of ‘Ziyan’, which were cultivated by single plant selection. ‘Ziyan’ is as the female parent, whereas the male parent has yet to be determined. In this study, we try to investigate cytological parameters of the three kinds of tea plants, and analyze the chromosomal karyotype differences among them. The results showed that the max arm ratio of ‘Ziyan’ was determined 2.50, and relative length was between 3.56% and 5.39%. The karyotype asymmetry index was 59.920%, and the karyotype formula was 2n=2x=30=22m (2SAT)+8sm. The max arm ratio of ZY-1 was 2.50, and relative length was between 4.80% and 8.69%. The karyotype asymmetry index was 60.307%, and the karyotype formula was 2n=2x=30=20m+10sm. The max arm ratio of ZY-3 was 2.77, and relative length was between 3.95% and 8.70%. The karyotype asymmetry index was 58.679%, which was lower than ‘Ziyan’ and ZY-3, and the karyotype formula was 2n=2x=30=24m+6sm. Although ‘Ziyan’ was significantly different from its two offspring, the karyotype characteristics of three varieties of tea plants were all type 2B. ‘Ziyan’ had a pair of satellites, but neither ZY-1 nor ZY-3 had a satellite. According to the karyotype asymmetry index and average arm ratio, the hybrid progeny ZY-3 was the most primitive, followed by the female parent ‘Ziyan’, while the hybrid progeny ZY-1 was the most evolutive.
Micromorphology and energy spectrum analysis of AsSe prepared by high-pressure and high-temperature
Authors: Qin-Bingke  , Ji-Yonghua  , Bai-Zhiling  , Huang-Run  , Li-Shangsheng  , Zhang-Jingzhu
Published: December 2019

Polycrystal compound AsSe was prepared rapidly by high pressure and high temperature (HPHT) method under the condition of 2.5GPa and 950K. The phase analysis, SEM and EDS of the samples were carried out. The results show that AsSe compound samples with fine crystallinity can be prepared rapidly by HPHT method, and the grain diameter of the samples is about 20 μ m. The results of AsSe EDS analysis show that the atomic ratio of the compound is close to 1:1.
Application of AHP in the Evaluation of Tourism Resources in Ethnic Regions: Case Study of Xichang, Liangshan Yi Autonomous Prefecture, China
Authors: Ma Zuozhenmo , Cai Yi , Pan Jinyu
Published: December 2019

Tourism resource evaluation is a comprehensive, multi-factor and multi-criteria complex problem, is the basis of tourism development. It reasonable to regional tourism resources development and utilization plays an important role, and by using AHP method to construct consists of resource conditions, environmental value and facilities management, and other three factor criterion layer and rule layer of 15 children factor of Xichang tourism resources evaluation model.
A Flow - Solid Coupling Permeability Model of Shale Gas Reservoir Based on Dual Media
Authors: Shi Di , Liu Jianjun
Published: December 2019

The study of shale gas seepage mechanism can provide theoretical basis for the production capacity evaluation and prediction of shale gas reservoir. The shale gas permeability model is an important part of the theoretical research of shale gas seepage. In this paper, the spring system model is applied to the shale reservoir, and the shale reservoir is simplified as the ideal dual porosity medium model. By analyzing and considering the influence of adsorption layer, diffusion, seepage, matrix deformation and slippage, the dual porosity permeability model of shale gas under various factors is given. In addition, the model is compared with the Civan permeability model and permeability experiment to verify its rationality. The results show that the model proposed in this paper is reasonable and reliable. The model has certain theoretical and practical significance for perfecting the theory of shale gas seepage flow.
Influence of Trough Excavation Study on Deformation of Deep Foundation Pit Support Structure in Water-rich Area
Authors: Li Leiming , Yang Chunying , Guo Xiaohong , Yao Zaifeng , Liu Da
Published: December 2019

Based on finite element numerical calculation, calculation results of first support, trough excavation and over-excavation working conditions were compared in this paper. Analysis of deformation difference of retaining structure in water-rich and thick sand stratum was provided. Calculation results were compared with actual monitoring data, in order to explore the influence law of trough excavation on the horizontal deformation of retaining structure. The results show that the trough over-excavation soil exacerbates the lateral deformation of underground diaphragm wall, the cumulative maximum is 9.28mm and the process maximum is 10.45mm, 34.93% of the maximum underground diaphragm wall deformation. Conclusion of back pressure soil restrains the deformation of underground diaphragm wall can also be drawn, the process maximum is 6.44mm, 21.52% of the maximum underground diaphragm wall deformation. The design of the deep foundation pit retaining structure should be checked as far as possible according to the actual working conditions to reduce the engineering risk, ensuring that the design is economical, reliable and reasonable.
Analysis of Kinetic Characteristics of Merey Crude oil Pyrolysis by Isoconversion Method
Authors: Zhang Meng , Zhang Xiao , Li Jintao
Published: December 2019

As an important chemical reaction during in-situ combustion, pyrolysis reaction is related to the whole combustion process. To understand the kinetic characteristics of the pyrolysis reaction more clearly, three models, FWO, Friedman and KAS, were used to fit and calculate the thermogravimetric data of Merey crude oil by three linear heating rates under air atmosphere and analyze the kinetic parameters of crude oil at different conversions. The results show that KAS model provides the fitting result similar to the FWO model, but Friedman model provides smaller result, and the FWO model provides the highest linear correlation and the most accurate calculation results among the three models; the gasification stage has the lowest activation energy, followed by low temperature oxidation stage, the pyrolysis stage has the highest activation energy and the highest energy consumption and is the core reaction in the whole process, and the high temperature oxidation stage has a bit lower activation energy than the pyrolysis stage among the four stages of thermal reaction of Merey crude oil.