bluuebunny/crossref_metadata_2025 huggingface dataset:
Virtual laboratories of electromagnetism for education in engineering: A perception
Authors: González J D , Escobar J H , Beltrán J R , García-Gómez L , La Hoz J De
Published: December 2019

The influence of virtual tools as didactic means towards the study of electromagnetism phenomena takes greater relevance every day at the Universidad del Magdalena due to the inclusion of a visual and dynamic element beyond the reading of physical text books and even the development of laboratories real electromagnetism. This article shows a very positive perception on the part of the engineering students regarding the advanced virtual laboratories of electromagnetism, influencing the learning of physical concepts and the development of cognitive competences. Studentś understanding of the concepts of physics in the domain of electromagnetic physics was evaluated in a pre- and post-test design involving 60 participants assigned to four experimental groups and 30 participants assigned to the control group. There were two experimental conditions, namely, experimentation with manipulation of real material, experimentation with virtual manipulation, as well as a condition of control (ie, traditional instruction with no virtual experimentation). Conceptual tests were administered to assess student’s comprehension before, during and after the application of the virtual laboratories. The analyzes revealed that even though the two experimental conditions promote the conceptualization and correct interpretations of the student’s physical concepts in the domain of electromagnetism better than in the control group as expected; we see that, the use of the virtual tool obtains a greater acceptance as this study shows.
Perceptions in students of degree in computers on the use of Robotics in the teaching processes
Authors: Sánchez H , Martínez L S , González J D
Published: December 2019

The teaching of robotics in a properly planned and controlled environment has allowed its incursion into academic stages both in secondary and higher education. So it should be added that the teaching process in this area, motivates and enhances the creativity and cooperative work of the students, connecting it directly with mathematics, physics, computers and electronics, I feel this the foundations that underpin and consolidate as you progress in the teaching process. Therefore, one of the objectives of this tool is to create an interest in science and engineering in students. This study was carried out to answer the question: How do professors and undergraduate students describe the usefulness, effectiveness and efficiency of using a robot as a face-to-face education technology for a learning experience? Therefore, one of the objectives of this tool is to create an interest in science and engineering in students. This study was carried out to answer the question: How do professors and undergraduate students describe the usefulness, effectiveness and efficiency of using a robot as a face-to-face education technology for a learning experience? For this study, two surveys developed by researchers were conducted to evaluate the perceptions of professors and undergraduates in computer science in a learning experience. The results of this study indicate that the teachers and students of degree in computer of the University of Magdalena, consider the use of robots as a facilitator of teaching processes as a highly motivating tool to undertake new teaching strategies and suggest a greater exploration due to the versatility that Robotics offers today.
Investigation of Power Networks and their Patterns by Mathematical methods in order to Voltage Stability Enhancement
Authors: Moghimi Seyed Morteza , Bostani Ali , Elahimanesh Abolfazl
Published: December 2019

Authors in the research paper has considered IEEE 14-bus and 34-bus test network for creation generation and load patterns. This paper aims at analysing the potential impacts that distributed generation (DG) might have on voltage stability of electrical power networks. It is expected that increasing amounts of new generation technologies will be connected to electrical power systems in the near future. Most of these technologies are considerably smaller scale than conventional synchronous generators. In this paper, the impact of DG pattern (size and location of DG) on the voltage stability of two test system is investigated. The simulation methodology is discussed as well. It is found that the effects of DG the voltage stability of a power system strongly depend on the size and location of the distributed generators. The results show that install of DG on the weak bus, improve loadability limit and voltage stability and decrease loss of system. By investigating and reviewing the results of similar patterns in these two systems, the different generation and load patterns impact mechanism of DG units over the behaviour of the systems in terms loadability limit and voltage stability is achieved.
Scenario of the evolution of the universe with equation of state of the Weierstrass type gas
Authors: Tsyba Pyotr , Razina Olga , Barkova Zinaida , Bekov Sabit , Myrzakulov Ratbay
Published: December 2019

In this article, we examined the Starobinsky gravity model in homogeneous and isotropic space-time described by the Friedman-Robertson-Walker metric. In the framework of this model, cosmological parameters were described that explain it in the early and late evolutionary times, such as the slow roll parameters, perturbation of curvature, scalar-tensor ratio, equation of state parameter and deceleration parameter. For reconstruction, an ansatz of a special type was chosen, which can be considered as a generalization of the Chaplygin type of gas. Energy conditions are also calculated for this model. Dependencies of these parameters on cosmological time are plotted graphically.
Cosmological solutions of F (R, T) gravity model with k -essence
Authors: Yerzhanov Koblandy , Meirbekov Bekdaulet , Bauyrzhan Gulnur , Myrzakulov Ratbay
Published: December 2019

Now exist several alternative cosmological models that describe observable properties of our universe. In particular, it is such models as F (R) and F (T ) gravity. We consider properties of their generalization as F (R, T ) model of gravity with kessence. We obtained some exact solutions of particular cass of scale factor a for general formof the F (R, T ) functions with scalar field. These solutions describe the accelerated/deccelerated periods of the universe.
Traveling wave solutions for the (3+1)-dimensional Davey-Stewartson equations
Authors: Serikbayev N.S. , Shaikhova G.N. , Yesmakhanova K.R. , Myrzakulov R
Published: December 2019

In this work, the extended tanh method is used to construct wave solutions for the Davey–Stewartson equations. The extended tanh method is a powerful solution method for obtaining different kind solutions of nonlinear evolution equations. This method can be applied to nonintegrable equations as well as to integrable ones.
Analyzing museum exhibition spaces via visitor movement and exploration: The case of Whitworth Art Gallery of Manchester
Authors: Liakou Melpomeni , Kosmas Odysseas
Published: December 2019

To analyse the movement and exploration of visitors on museum exhibition spaces, agent based models that simulate their behaviour can be a useful tool. Such a model is proposed here, to which we use appropriate defined dynamical and social forces to describe their motions, while the resulting decision making procedure either preserves or creates groups of individuals. That proves to give realistic visitor motions to complex and multi level spaces while resulting the way they bypass obstacles, move to stairs or follow other groups on their way out. Simulation results are then used to analyse the exhibition spaces of the Whitworth Art Gallery throughout the motion flow of the visitors.
V International Conference Days of Applied Mathematics
Authors: Sandoval-Amador A , Acosta A Pimienta , V-Niño E D
Published: December 2019

This proceeding presents the written contributions of the participants of the V International Conference Days of Applied Mathematics (V ICDAM), which was held from 15 to 17 May 2019, at the Barranquilla, Colombia, and was organized by the “Facultad de Ciencias Basicas y Biomedicas” of the Universidad Simon Bolivar.

The purpose of the V ICDAM was to share experiences of mathematical knowledge for solving situations/problems seen from different contexts. The topics developed in this conference was: (i) Mathematical Didactics (MD), (ii) Mathematical Modelling (MM), (iii) Scientific Computing (SC), and (iv) Multidisciplinary Science (MS)

Within the framework of this conference, the Olympic of University Applied Mathematics and the Olympic of High School Applied Mathematics were held. With these latest activities, the idea is to mitigate the gap between high school and higher education in the region, inviting students of the 11th grade and the math teachers from schools and institutions of higher education located in the metropolitan area of Barranquilla.

List of Organizing Committee, National Scienctific Committee and International Scienctific Committee are available in this pdf.
Importance of coupling the teaching methodologies of mathematics with the learning styles of digital natives
Authors: Guzmán M Orozco , Castro S Obredor , Acuña F Mejía , Malo E Silvera
Published: December 2019

The purpose of this article is to explain the importance of adapting the teaching and learning methods of mathematics through the use of ICTs. It is suggested that it is necessary to do so, because at present, we are in the knowledge and information society. For this, we use the literature review as an investigative method, with which we hope to explain the disadvantages of continuing to use traditional methods and the importance of innovating it through reflective practices and collaborative projects. Then, we will address the skills that need to be developed, to adapt students to the demands of today‘s societies. Similarly, we will explain the characteristics of modern students through the concept of digital natives, to identify what tools and methods can be used in order to facilitate meaningful learning of mathematics. Finally, we will be offering a discussion about the method that should be implemented and what studies exist to support its use. It is concluded that the Tics must be included in the teaching of mathematics because they are necessary to adjust to work and professional life.
Geocatatum: Its influence on the development of children‘s geometric thinking
Authors: Ovalle E López , Ortega M Vergel , Colmenares C A Gómez
Published: December 2019

The objective of this article is to analyse the influence of the implementation of the Geocatatum platform, a didactic tool in the teaching of geometry in early childhood education. The research follows a mixed study, quasi-experimental and phenomenological design; the sample conformed of 250 children from educational institutions in the Catatumbo, Norte de Santander, Colombia. Resources and services for students and teachers are announced in the development. The results show that the virtual resources and services designed and implemented improved academic performance in geometry and the development of geometric thinking. Emerging categories to these factors were promotion of practices of application of geometry in context, effective use of tic and communicative skills.
Technology and mathematics as a cognitive component
Authors: Mendoza D , Nieto-Sánchez Z C , Vergel-Ortega M
Published: December 2019

The objective of the study was to analyze the technological impact and cognitive attributes of technology for the construction of meaningful learning of mathematics students at Universities in Ecuador and Colombia. The sample was non-probability, with the participation of 1124 students. A mixed study of sequential explanatory design was applied. In the quantitative phase, correlational method, were applying a digital questionnaire, the data were analyzed through multiple regression and statistical analysis of nested variance to two variables demonstrating the need to implement mathematical software. In the qualitative phase, the mathematical software Wiris and Geogrebra were implemented and results merged by the contrasting method. The conclusions demonstrate the impact of digital connectivity, distinguishing technology as a cognitive component through dynamic knowledge. The method was effective to the development of logical analytic thinking; boosted the activity of the right limbic lobe.
Landscape sustainability analysis: Methodological approach from dynamical systems
Authors: Redondo J M , Bustamante-Zamudio C , Amador-Moncada J , Hernandez-Manrique O L
Published: December 2019

Sustainable development is a concept that has been maturing since its promulgation in Brundtland in 1987. Following a complex systems-based reflection that involves system dynamics, dynamical systems and viability theory, is proposed that sustainability is an emerging expression of the landscape, whose emergence results from the socio-ecological interactions of the landscape, so its analysis must be of a type systemic, incorporating the temporal transformation of all landscapes aspects, and not only portions of them, in addition, in this paper is explained that sustainability does not exist as a single state, but that there are sustainabilities and that, although its analysis is specific space, it should allow comparison with higher and lower spatial scales. In this way, a methodological approach is made from dynamical systems theory for sustainability landscape analysis. This perspective not only allows to recognize the trend behavior of a socio-ecological system in the landscape establishing its sustainability, but it is also oriented to decision-making, so, the management of sustainability indicators should not be done as if in the landscape were disconnected, causing possible deterioration of other indicators during the management, but through sustainability principles defined as indicators set satisfying constraints. In this way, the perspective from the dynamical systems theory allows the recognition of sustainability and guides on the decision making in the landscape.
Some tastings in Morales-Ramis theory
Authors: Acosta-Humánez P , Jiménez G
Published: December 2019

In this paper we present a short material concerning to some results in Morales-Ramis theory, which relates two different notions of integrability: Integrability of Hamiltonian systems through Liouville Arnold theorem and integrability of linear differential equations through differential Galois theory. As contribution, we obtain the abelian differential Galois group of the variational equation related to a bi-parametric Hamiltonian system.
Renal lithiasis detection in uro-computed tomography using a non-parametric technique
Authors: Rodríguez-Ibáñez R , Vera M I , Vera M , Gelvez-Almeida E , Huérfano Y , Valbuena O , Salazar-Torres J
Published: December 2019

Renal lithiasis is the pathology that causes nephritic colic, which is one of the most frequent reasons for consultation in emergency medical services. According to the size, location, hardness and number of stones present in the urinary system, usually in the human kidney, it is established to which form of treatment is suitable for the patient. These kidney stones can be analyzed by means of biopsy or imaging modalities such as computed tomography images. This type of images has challenging problems called noise, artifacts and low contrast. In this paper, in order to address these problems, a non-parametric semi-automatic computational technique is developed for detecting kidney stones, present in computed tomography images, using digital image processing techniques based on a smoothing filter and an edge detector. Finally, the size and position of the stones present in the images are calculated and a precision metric is considered to compare the manual segmentation, performed by an urologist, and the one generated by the NPCT, obtaining an excellent correlation. This technique can be useful in the renal lithiasis detection and if it is considering this kind of computational strategy, medical specialists can establish the clinic or surgical actions oriented to address this pathology.
Volumetric quantification in ovarian pathology using abdomino-pelvic computed tomography
Authors: Valbuena O , Vera M I , Vera M , Gelvez-Almeida E , Huérfano Y , Borrero M , Salazar-Torres J , Salazar W
Published: December 2019

Pathological ovary is categorized into cystic tumors, solid tumors and mixed, according to the content of the affected ovary. Accordingly, the degree of benignity or malignity thereof is established. The imaging study for the preliminary morphological assessment of PO is ultrasound, in its pelvic and transvaginal modalities, for which well-established criteria are available. Once the ultrasound findings suggest malignancy, complementary studies such as abdominal-pelvic tomography images and tumor markers are requested. This type of images has challenging problems called noise, artifacts and low contrast. In this paper, in order to address these problems, a computational technique is proposed to characterize a pathological ovary. To do this, a thresholding and the median and gradient magnitude filters are applied, preliminarily, to complete the preprocessing stage. Then, during the segmentation, the algorithm of region growing is used to extract the three-dimensional morphology of the pathological ovary. Using this morphology, the volume of the pathological ovary is calculated and it allows selecting the surgical-medical behavior to approach this kind of ovary. The validation of the proposed technique indicates that the results are promising. This technique can be useful in the detection and monitoring the diseases linked to pathological ovary.
Association between breath methane concentration and visceral fat area: a population-based cross-sectional study
Authors: Ozato Naoki , Saito Shinichiro , Yamaguchi Tohru , Katashima Mitsuhiro , Tokuda Itoyo , Sawada Kaori , Katsuragi Yoshihisa , Kakuta Masanori , Imoto Seiya , Ihara Kazushige , Nakaji Shigeyuki
Published: December 2019

High visceral fat area (VFA) is a stronger predictor of cardiovascular disease and overall mortality, compared with body mass index (BMI) and waist circumference (WC). Recent reports demonstrate that obesity is related to breath gas, which is produced by the intestinal microflora. However, these studies define obesity using BMI, not VFA. In this population-based cross-sectional study, we investigated the relationship between breath gases (methane and hydrogen) and both VFA and BMI. A total of 1033 participants (62% women; age [mean ± standard deviation] 54.4 ± 14.9 years) in the 2015 Iwaki Health Promotion Project in Japan were enrolled in the study. Breath samples were collected using a breath bag and analyzed by gas chromatography. VFA was measured using a visceral fat meter. The proportion of methanogenic bacteria to total intestinal microbiota was measured by polymerase chain reaction and 16S rRNA gene sequencing analysis. Our analysis revealed a significant association between high VFA and low breath methane, even after adjusting for confounding factors (B = −0.024 and P = 0.004). To identify the association between breath methane and VFA in participants with methane-producing bacteria in their intestinal microflora, participants were divided into two groups based on the presence or absence of methanogenic bacteria in their stool. The Methanogen + group was further divided into two subgroups with breath methane higher (Methane-UP) or lower (Methane-LO) than the median breath methane concentration. VFA was significantly lower in the Methane-UP group than in the Methane-LO group. In participants with methanogenic bacteria, breath methane concentration might be an independent biomarker of visceral fat accumulation.
Research on radiation noise field reconstruction of underwater vehicle shell structure
Authors: Xu He , Kong Deyi , Qian Yujie
Published: December 2019

When studying the radiation noise of underwater vehicle, it is more realistic to simulate the underwater vehicle by using the volume source shell structure model. However, in the process of using COMSOL to simulate the radiation noise of the underwater vehicle shell structure, the far field calculation cannot be realized with the software because the calculation amount is too large. This paper proposes to measure the noise of underwater vehicle shell structure model in the near field. According to the theory of acoustic holographic and the idea of equivalent source, it is achievable to obtain the equivalent sound source of underwater vehicle shell structure noise source, and thus realizing sound field reconstruction. Studies have shown that underwater vehicle radiation noise field reconstruction and far-field calculation can be achieved by transformation within the tolerance of error. At the same time, this paper also compares the reconstructed sound fields obtained by different methods.
Study on compatibility of hydroxypropyl guar gum/ultrafine powder of bagasse blends
Authors: Huang Xiaobing , Chang Gang , Wei Xiaoyi , Wang Fei , Cui Lihong , Fu Tiaokun , Xia Wen
Published: December 2019

The influence of the concentration of bagasse ultrafine powder on the compatibility of hydroxypropyl guar gum solution/bagasse ultrafine powder blend system was investigated by Hakke MARSIII rheometer from Germany. According to Utraki principle, composite viscosity, storage modulus and loss modulus analysis, cole-cole curve and other theories, the stable and dynamic scanning data of the blends were processed and analyzed. It was found that when hydroxypropyl guar gum/bagasse ultrafine powder =40/100 (m/m), the compatibility between the two was good. SEM also confirmed this conclusion.
Study the critical value of outburst effect inspection index in the case of regional gas predrainage
Authors: Wang Song
Published: December 2019

China is one of the nations that have grievous coal and gas outburst problems, gas outburst prediction is the key technology of gas prevention and treatment, the critical value of gas outburst prediction index in relation to coal mine production safety and the economy. In order to study the evaluation index of the regional drainaged NO.3 coal seam in Sihe mine, based on the gas outburst integrative theory, proposes gas content under the corresponding beginning outburst gas pressure is treated as evaluation index critical value. Raw coal samples were taken on site and sealed, and their residual gas content and residual gas pressure were determined after adsorption equilibrium. By this method, the law of residual gas content and residual gas pressure of raw coal under the influence of original moisture is studied, and the corresponding gas content under initial gas outburst pressure is obtained, and the critical gas content value of 10m3/t is verified on the spot.
Experimental research and application of tunnel transient electromagnetic leading detection remove noise method
Authors: Lv Guoren , Ge Jiandong , Zhang Lewen
Published: December 2019

In the construction process of underground space engineering such as tunnels, it often faces geological disasters such as water inrush and mud inrush. The transient electromagnetic method is based on the difference in electrical resistivity between surrounding rock and water-bearing structure, and can detect and locate the water-bearing structure in front of the tunnel face. However, due to the interference in the tunnel environment, the quality of the late data in the actual detection process is relatively poor and generally cannot be used. In this paper, uniform half-space model and three-layer classical model are designed to study the applicability of converting induced electromotive force detected by transient electromagnetic method into apparent resistivity. It is found that the late data conversion effect is good when there is no interference, and the late data conversion effect is poor in the case of strong interference. Using these two models, three filtering algorithms are compared respectively to improve the quality of late data, improve the detection depth of transient electromagnetic method. Through field experiments, after comparing the filtering algorithm with the traditional direct truncation method, it is found that the late data can be used, which effectively improves the depth of detection, and the early data imaging results are the same as the direct truncation mode imaging results, the filtering algorithm does not affect the early data.
Research on the settlement of deep water submerged dike structure
Authors: Liu Wenbin , Zhao Yan
Published: December 2019

The 12.5 m deep-water channel from Nanjing to mouth in the Yangtze River is a national key channel. This paper analyzed the settlement feature of deep water submerged dike structure in He changzhou waterway section based on in-site tests. The settlement was recorded and a fitting function to predict the long-term settlement was proposed.
Calibration and Error Analysis of Mine Dust Monitoring System
Authors: Yang Zhang , Jingcan Shi , Changlong Jiang , Shoufeng Tang , Minming Tong
Published: December 2019

Since most of China’s coal mines have not taken effective measures to prevent dust and dust, the harm of dust to the human body has been in a high situation. At present, there are still some problems in the reliability and detection accuracy of most dust monitoring systems. In this paper, a large number of simulation experiments have been carried out, and the test data have been used to verify the results. The reliability and measurement accuracy of the dust monitoring system are verified from the calibration and repeatability of the monitoring system. At the same time, the error sources that affect the accuracy of the monitoring system are analyzed and the solutions are proposed. The system is improved in the subsequent experiments, which improves the accuracy and reliability of the system measurement.
Valuation of Urban Water Eco-System Service Functions
Authors: Zhang Lijia , Huo Peng , Zhang Yang
Published: December 2019

Water eco-system service functions refer to the natural environment conditions and utilities formed by the water eco-system and ecological process to maintain human survival. They are the eco-environmental conditions for human survival and development and the basic resources of human social and economic development. During the rapid development of the urbanization process, the urban water eco-system has been increasingly influenced by human activities. Humans have severely destroyed the original urban water system while exploiting and utilizing water resources on a large scale, and consequently resulted in a series of water environment problems. In order to build a harmonious urban eco-system and reasonably utilize and protect water resources, it is of great importance to analyse and improve the urban water eco-system service functions and conduct the valuation, so as to arouse the public’s awareness of recognizing and protecting the urban water resources.
Research Progress of Biochar in Memediation of Contaminated Soil
Authors: Shuang Cui , Xumeng Cui , Qikai Zhang , Jianhui Song , Changjia Jiang
Published: December 2019

Biochar is a carbon-rich material produced by pyrolysis and carbonization of biomass raw materials (mainly agricultural wastes) under complete or partial hypoxia. Because of its excellent structural properties, it is often applied to contaminated soil as a remediation agent and soil amendment agent. In recent years, biochar has attracted widespread attention in environmental remediation, and has become a research hotspot in current environmental science. This paper introduces the biochar treatment of soil pollution by introducing the concept, preparation method and physicochemical properties of biochar. The research progress of biochar in the treatment of heavy metal contaminated soil in recent years was reviewed. The effect of biochar on the bioavailability of heavy metals in soil was discussed. However, there are still some shortcomings in current research and remediation methods. It is expected to find environmentally friendly, scientific and reasonable materials and technologies to repair soil pollution.
Research progress on wastewater treatment methods and technologies in paper industry
Authors: Lin Yi , Lin Hua , Chen Kaiwei , Cai Tongbo , Liu Zhaojun , Wang Yian , Chhuond Kong
Published: December 2019

The pulp and paper industry has polluted a large amount of water, and it has the traits of high concentration and wide coverage, which can be said to be one of the most serious polluting sectors in China. With the rapid development of the paper industry, the treatment of its wastewater has also attracted the attention of many departments. The treatment of industrial wastes from the paper industry has always been concerned by researchers, and it has many treatment methods which has its own advantages and disadvantages. This paper discusses different common methods and combination techniques and their application in treatment of industrial wastes from the paper industry.
Design and Research of Wind Erosion in Sandy Land and Typical Sand Fixation Project in Small Watershed in Jiangxi Province
Authors: Zhan Lichao G , Meng Chen , Yuejun Song , Peilin G E , Minghao MO , Jian Duan
Published: December 2019

Due to the difference in climate, soil, region and geomorphology in north and south, there are certain characteristics in the design requirements of sand fixation project for a small watershed in Jiangxi Province in southern red soil region. It is quite different from that of northern China, so it should be designed according to the local condition of Jiangxi province. This paper enumerates the distribution, causes and characteristics of wind erosion in sandy land in Jiangxi Province. According to the principle of “advanced technology, reasonable economy, safety and reliability”, sandy land treatment and restoration technology of typical Vitex trifolia in Jiangxi Province are selected for description. Suitable sand fixation engineering design for Jiangxi Province with prolonged service life, high comprehensive benefit, low cost and simple construction technology is formed. It has important technical guiding significance for promoting the construction of ecological Poyang Lake Basin and national ecological civilization experimental area, improving the effectiveness of sand control measures, protecting “one lake of clean water” in Jiangxi Province.
An Empirical Study on the Identification of Driving Factors for Two Types of Typical Atmospheric Pollutant Emissions from Power Generation in China
Authors: Xiao Kun , Zhang Jingdong
Published: December 2019

Emission of air pollutants from the power generation industry is a major cause for severe air pollution prevention in China. Identifying the important driving factors of air pollutant emissions from power generation, and evaluating the importance of these factors are of great significance to formulate air pollution prevention policies. Based on the classic STIRPAT model, this paper expands the indexes of relevant economic, social and technical factors, and creatively takes the input of power generation environmental protection facilities as an important technical factor to evaluate the contribution of these factors to two typical air pollutants (SO2 and smoke dust) of power generation. The empirical study results show that the indicators of economic, social and technical factors proposed and expanded in this paper are significant and effective, and “annual operating cost of industrial waste gas treatment facilities”, “power consumption intensity of secondary industry” and “power generation structure” are the variables that have the strongest impact on the emission of two typical air pollutants of power generation. These empirical study results provide scientific guidance for further policy making.
Advanced Treatment of Dry-Spun Acrylic Fiber Wastewater by O3/UV-BAF Process
Authors: Bin Li , Fang Yang , Peng Yuan , Hai-qing Liao
Published: December 2019

The dry-spun acrylic fiber wastewater is characterized by its complicated components and high volatility of water quality. Therefore, it is typically difficult to treat. In this paper, the advanced treatment of dry acrylic plant effluent was treated by the joint process of ozone/ultraviolet-biological aerated filter (O3/UV-BAF). The effects of ozone dosage and pH on ozone to degrade COD were discussed, and under the condition of the process running steadily, the removal effect of each unit on COD was investigated. The results showed that with the increase of ozone dosage, the increase of COD removal was generally shown as a slow first, then a fast and then a steady trend. In the ozone dosage from 52.6 to 63.2 mgL-1, the COD removal rate reached 32.7% to 35.3%, and had the best economic feasibility. At pH 9 or so, the COD removal was the highest. The average removal of O3/UV for COD was 32.0%, the average removal of BAF for COD was 32.6%, and the average COD concentration of effluent was 83.4 mgL-1, met its first class discharge standard.
Changes in water use structure in Shandong Province in the past 20 years
Authors: Yan Cai
Published: December 2019

This paper analyzes the changes of water use structure in Shandong Province from 2000 to 2017 in Shandong Province, reveals the driving factors that lead to changes in water use structure. The results show that in the past 20 years, the total water use has firstly increased and then slowly decreased; the agricultural water use has decreased continually; the industrial water has firstly fluctuated and then keeped stable; while the domestic water use and environmental water use has continually increased. The driving factors of water use are agricultural water saving, industrial water saving, population and water consumption per capita growing and landscaping area enlarging.
Study on the applicability of key parameters from dust emission scheme in WRF/Chem over northwestern China
Authors: Zhao Wenpeng , Zhao Jun , Zhao Dandan , Li Jincai
Published: December 2019

In order to more accurate quantitative simulation and forecast of sandstorm in northwest China, in this paper, the dust process occurred in northwest China was simulated by using the WRF/Chem model coupling of Shao2004 dust emission parameterization scheme. The influence of key parameter C in Shao2004 scheme is analyzed set at different values on simulated spatial and temporal dust concentration, estimated vertical dust flux and estimated PM10 and PM2.5 concentration of six stations in northwest China. And by comparing the concentration of PM concentration observed at the sites, the results were listed as: Parameter C has an significant influence on the simulation dust scope and maximum center value of dust concentration and vertical dust flux; Different C values can well simulate the variation trend of PM10 and PM2.5 concentration in dust weather, but only when the C value set as 1, this model can more accurately simulate the change of PM10 and PM2.5 concentration in the dust process in northwest China.
Environmental Pollution Cost Model for Land Development Projects
Authors: Chen Xiu , Wang Zeping , An Yifei , Sun Mingqi
Published: December 2019

The environmental pollution cost is a measure of the extent of damage to the environment of land development projects. It should be an important part of corporate decision-making. Environmental pollution cost refers to economic losses caused by environmental pollution, including environmental degradation cost and pollution control cost. First, we use the market value method to establish the cost equations for water, energy and land environmental degradation. In addition, we use principal component analysis to select two main factors affecting environmental control cost: environmental pollution level and corporate environmental management level. We use the entropy weight method and the analytic hierarchy process to normalize the management level, and then establish an equation for accounting for the pollution control cost of the project. Enterprise environmental pollution cost accounting system is conducive to the enterprise to accurately calculate the environmental pollution cost of land development projects. Reasonable control of environmental pollution is conducive to the sustainable development of the economy and society.
Study on the Active Effect of Soil Nutrient Elements
Authors: Zhang Lu , Hu Ya
Published: December 2019

The purpose of this study is to ecologically soil, reduce fertilization and maintain land productivity. In this study, the amount of nutrient elements stored in the soil is large, and the soil samples are treated with long-term constant and different water content to determine the activation amount of the solid elements in the soil. The results showed that the content of available phosphorus and available potassium released by XH6 in different water content cultures was higher than 3.89% and 10.12% of XH10, respectively. The content of nitrate nitrogen released by XH4 was higher than that of treated XH4. %. The content of ammonium released under treatment of XH10 was higher than that of treatment with XH10 of 24.11%. The release nutrients varied with the culture time, but the release of nutrients such as ammonium nitrogen, nitrate nitrogen, available phosphorus and available potassium peaked on the 14th day of culture, and stabilized in the latter culture. So, the high moisture content has a certain release and increase effect on soil available potassium and available phosphorus.
Research on Evaluation of Technology Innovation Efficiency in China’s Pollution-Intensive Industries
Authors: Guo Min , Chi Chunjie
Published: December 2019

Based on 20 pollution-intensive industries’ data in China during 2007-2016, this paper employs two-stage SBM model to evaluate the technology innovation efficiency of Chinese pollution-intensive industries. The results show that: the industry with the efficiency value between 0.6 and 1 in the R&D stage and the commercialization stage only accounts for 30% and 50%. Also, the R&D ability limits the improvement of technology innovation efficiency in pollution-intensive industries.
Research of rural domestic sewage treatment processes in Ningbo
Authors: Cheng Jianhua , Chen Yuhui , He Yong , Hu Haolei
Published: December 2019

Through comparing national, provincial and municipal standards in rural domestic sewage treatment, appropriate standards and indexes are chosen to implement rural sewage treatment in Ningbo. Among some commonly used rural sewage treatment processes under such climate as Ningbo, there are four most often used processes in the first phase of Ningbo from year 2009 to 2012. In order to assess the effluent treatment effects, four typical sewage quality indexes, which are CODCr, SS, TN and BOD5, are chosen to assess effluent qualities in four typical processes. The investigation results show that every process of the four typical processes has its advantage in rural sewage treating, and there is no process can remove all the sewage pollutants to the most simultaneously. The operation results of different processes are compared in details in this paper. Through the research, it can help to eliminate inappropriate processes and explore some suitable processes for rural domestic treatment. As a result of the research of rural sewage treatment processes in Ningbo, two kinds of typical composite processes are respectively demonstrated in different occasions in water-source-protecting areas and non-water-source-protecting areas.
Study on the Relationship between Acid-rain pH Value and Fog-water Conductivity
Authors: Zhang Liu , Chao Yafeng , Huang Fuyong , Wang Cheng , Yue Yishi , Liu Sanwei , Duan Jianjia
Published: December 2019

Active ions in acid rain may decrease the electrical performance of the insulation outside the electrical equipment. The relationship between acid-rain pH value and fog-water conductivity is studied in this paper. It is found that the acid rain ion component and pH value are very correlated with local air pollution. The pH value and conductivity of sediment water in different areas may be different. The conductivity γ-value of acid precipitation decreases with the increase of pH value. The external insulation electrical test can be carried out by adjusting fog water conductivity equivalent simulation of acid wet sedimentation.
Effect of applying straw of Solanum photeinocarpum and their hybrids on nutrient of lettuce and soil under cadmium stress
Authors: Wu Yongmei , Wang Liming , Tang Yi , Xie Yongdong , Liu Lei
Published: December 2019

In this study, the straw of Solanum photeinocarpum and their hybrids were applied. The effect of applying straw on nutrient of lettuce and soil under cadmium stress was investigated. The results showed that the application of straw increased the total nitrogen, total phosphorus and total potassium contents in shoot of lettuce, except for the content of total nitrogen in shoots of lettuce by applying the straw of S. photeinocarpum whose male parent was from Ya’an. The content of soil effective nutrients, the activity of urease, sucrase and catalase in soil increased remarkably after applied straw of S. photeinocarpum, especially the straw of S. photeinocarpum whose male parent was from Chengdu. It can be seen that during the process of maturity of S. photeinocarpum straw, a large amount of nutrients were released, the soil fertility and soil enzyme activity were improved, and the nutrient uptake of lettuce was promoted, too. Therefore, it was conducive to the growth of lettuce.
Effects of exogenous glutathione on antioxidant system of cucumber seedlings under cadmium stress
Authors: Kang Yuxue , Yu Fangbin , Huang Zhi , Guo Peipei , Xu Weiping
Published: December 2019

With the development of social economy, environmental protection has become a hot topic. Excessive emissions of agricultural chemicals increase the accumulation of the heavy metal cadmium (Cd) in soil. When plants are stressed by high concentrations of heavy metals, their antioxidant capacity and detoxification capacity will decrease, which will lead to damage the cell mechanism of plants. Glutathione (GSH), as an important water-soluble antioxidant in the organism, can enhance plant resistance in stress. This study used cucumber seedlings as test material, using hydroponics, to research the effects of exogenous GSH on antioxidant system under Cd stress. The study showed that exogenous GSH could enhance the antioxidant capacity of cucumber leaves under Cd stress and increase the activity of SOD and POD, and reduce the content of MDA. However, the contents of reduced GSH and GSSH were reduced when exogenous glutathione was applied under Cd stress.
Application of waste materials in rapid soil maturation
Authors: Jing Wei , Tingting Meng
Published: December 2019

With the implementation of the policy of linking the increase and decrease of urban and rural construction land, migration and relocation, as well as the reason of the high stripping cost of mature soil, more and more raw soil needs to be reclaimed for cultivated land, and the rapid ripening of raw soil has become a new problem that we are faced with. In this paper, the present research status of raw soil maturation is summarized, and the application research status of green material filter mud, fruit residue, construction waste powder particle and fly ash in raw soil maturation is expounded, and the improvement measures and suggestions for different soil types of acidified soil, saline alkali soil and clay are obtained.
An investigation of trace metals and oil contamination in Southampton Water sediments: the distribution and influence on organisms
Authors: Tingting Shi , Fang Chang
Published: December 2019

An investigation was conducted on 21st April 2012 in Southampton Water sediment, with the aim of detecting the contaminants distribution and the influence on the living organisms. Among the sampling sites, station 3 and 4 are most close to Fawley oil refinery, where contaminants with respect to trace metals, Cu and Zn, and oil are observed with highest concentrations. Metals contained in the sediments are in forms of weakly bounded compounds, such as carbonates and oxides, or strongly bounded complex, including organic metals and sulphide. High values of organic matter concentration in sediment at station 3 agree with the oil release from Fawley. Chlorophyll a concentrations are lowest at station 4, corresponding to the high pollution around.
Evaluation of Drainage Capacity in Old Urban Area of Tongshan County Based on SWMM Model
Authors: Jun Shao , Xue Luo , Jiali Yao
Published: December 2019

Scientific simulation calculation and capacity evaluation of urban drainage system can provide theoretical guidance for the adjustment and optimization of urban drainage system planning scheme. Taking the drainage system of the old urban area of Tongshan County as an example, based on the analysis of the present drainage and waterlogging prevention facilities, this paper evaluates the existing drainage network of the city by using the rainstorm runoff management model SWMM (Storm Water Management Model), analyzes the actual drainage capacity, and puts forward some suggestions for the optimization and transformation of the pipe network. The research ideas and methods in this paper are universal and can be used for reference for the evaluation of drainage capacity in other areas.
Design of ditching fertilization structure of rubber tree particles fertilizer based on visual surveillance elements
Authors: Yuan Zhang , Yeqin Wang , Yiguo Deng , Peimin Chen , Bo Yan , Xiangjun Zou , Yong Zheng , Sihao Wu , Huixian Zhu
Published: December 2019

There are large fertilization/more times/environment complex during natural rubber tree in the process of the growth cycle and difficult to monitor, aim to the special rubber particles fertilizer easy to deliquescence and cause pipe blockage and then lead to fertilization breaks leakage problem, this paper designed a kind of convenient for visual surveillance of rubber particles ditching fertilizer structure. Optimal designed and analyzed reliability its structure characteristics/working principle/core components and monitoring method. The self-running power suspension test shows that when the moisture content of the fertilizer is ⩽0.16, the scraping structure has no obvious stick with fertilizer go down smoothly, and the strip breaking rate index is ⩽ 0.06, the structure basic function indexes meet the design requirements
Research on rapid semi-quantitative determination of titanium in pyrotechnics
Authors: Jun-yi Wu
Published: December 2019

This study discloses a method for rapid semi-quantitative determination of titanium in pyrotechnic powder for fireworks and firecrackers based on energy dispersive X-ray fluorescence spectrometer (EDXRF), including the following steps: preparation of samples, establishment of testing methods, determination of the characteristic line fluorescence intensity values of Ti element in samples, and according to the measured fluorescence intensity values, the titanium content in the pyrotechnic powder samples can be semi-quantitatively determined. The method of the study has the advantages that: (1) the method is simple to operate, and the method can be repeatedly called for testing. Only one new test method needs to be built before the sample test. After the method is established, the test can be repeated at different times without re-establishing the test method for each test. After the first establishment of the new test method, the entire test process only includes three steps: sample preparation, sample loading into the sample cup and on-board testing. (2) The detection period is extremely short. After the sample is prepared, the entire measurement process takes only about 2 minutes. (3) Labor intensity is very low and the requirements for operators are not high. (4) The method has good stability, good repeatability and high credibility.