bluuebunny/crossref_metadata_2025 huggingface dataset:
Employing Successive Ionic Layer Adsorption and Reaction (SILAR) Method on the Fabrication of Cu3BiS3-Semiconductor-Sensitized Solar Cells
Authors: Noer N M , Rahayu S U , Sebayang K , Sianturi H A , Lee M-W
Published: June 2020

Successive ionic layer adsorption and reaction (SILAR) method is a modified version of chemical bath deposition (CDB) that serves as a low-cost and convenient on the production of ternary metal chalcogenides. This research reported the utilization of SILAR method on the fabrication of Cu3BiS3 semiconductor-sensitized solar cells. The concentration of bismuth and copper precursor were varied, namely 0.03 M and 0.1 M, whereas the precursor of sulfide was varied in the concentration of 0.02 M and 0.05 M. The variation of SILAR cycles was employed to investigate the most appropriate cycle numbers in producing Cu3BiS3, in particular 3-9 cycles, 5-15 cycles, and 6-6 cycle with the immersing time of 20 s for each. The results show that there were only two suitable peaks appeared for 3-9 cycles and 6-6 cycles, while 5-15 cycles provide the more preferable XRD patterns with the power conversion efficiency of 0.02% (Jsc of 1.75 mA/cm2; Voc of 0.04 V; FF of 29.65%). It can be said that SILAR method with higher number of cycles can be employed to fabricate Cu3BiS3; however, smaller PCE came from inappropriate structure alignment between Cu3BiS3 and metal oxide layer.
Study on Experimental of continuous solar dryer with dessicant Cacl2 thermal storage
Authors: Qadry A , Romauli N D M , Ambarita H
Published: June 2020

These studies relate to Red chili dryers sourced from solar energy, the main objective of these experiements to analyses the effectiveness of desiccant CaCl2 at nighttime, so that they can be received by the community. The parameters that are used in this experiment are, Temperature and Relative humidity, temperature and humidity can be maintained. The initial weight of 0.61 kg in drying chamber 1 and 0.60 kg drying chamber 2, then placed in a different drying chamber, and the final result where a 0.61 kg with desiccant and 0.64 kg without desiccant. The result of these experiment with desiccant CaCl2 the weight can be maintained with constantly and drying chamber without dessicant can be reached 0.05 kg.
Analyzing of Phase Change on Binary Alloy System Pt1-X Mnx (X=17.5 At. %) By Diffraction Method
Authors: Sembiring Timbangen , Tarigan Kerista
Published: June 2020

The research on analyzing of phase change on binary alloy Pt1-X Mnx (x=17.5 at. %) system had been performed by diffraction and resistivity measurements. The purpose of this experiment is to investigate the change of order-disorder phase transition and its critical temperatures. The polycrystal samples of nominal concentrations of 17.5 were prepared from 99.999 % of pure platinium and 99.99 % of pure manganese. This sample was heat-treated separately at 1150°C for 2 days to remove strains. Then, the sample was quenched by dropping quickly into iced water to get a disordered state. X-ray diffractometer experimental results shows that samples contained 17.5 at. % Mn and heat-treated at the temperature of 1150°C for 2 days were in the disorder state. Meanwhile, ordered state was seen on the sample of 17.5 at. % Mn, heat-treated at 800°C for 10 days.
Adsorbing on Dissolved Copper Metal by Charcoal Rambutan Rods
Authors: Tarigan K S , Haryanto B , Tambun R , Manik K , Lumbangaol A K
Published: June 2020

Charcoal was produced from rambutan rods. The charcoal was then used as adsorbent to adsorb copper ion 70 ppm dissolved in solution. The charcoal rambutan has ability to adsorb the copper ion (%R) 62,068 or about 43,456 ppm. SEM EDX was used to confirm the ability of the charcoal to adsorb the metal ion. The ability to adsorb is 0,15 % of weight. The advantage the study is to give information that the rambutan rods charcoal has potential to use as adsorbent to clean of water contaminated by metal ions.
Generalized Reduced Gradient Approach for Solving Sustainable Production and Scheduling Planning of Crude Palm Oil Milling Industries
Authors: Mawengkang H , Sutarman
Published: June 2020

It is well known that crude palm oil (CPO) is obtained from the milling process of raw bunch, called fresh fruit bunch (FFB). The process usually flows through a series of stages producing and consuming intermediate products. It is assumed that the CPO industry considered in this paper does not own oil palm plantation, in such a way that the FFB are supplied by several public plantations. Due to the availability of FFB, it is then necessary to select from which plantations should be appropriate. This paper describes a mixed integer linear programming model to tackle the supply chain integrated problem, along with waste problem. The mathematical optimization model is solved using generalized reduced gradient search approach.
Crushing Mung Beans Using Ball Mill Tool: Base on Fraction Size Sieving Results
Authors: Haryanto B , Trisakti B , Wangi Y , Khosman H , Sinaga A W
Published: June 2020

Ball mill is an operating unit used to grind various types of solid materials into finer particle sizes. The purpose of this study was to determine the best variation of operating conditions of mung bean milling in a ball mill by varying the grinding time, weight of raw materials and the number of balls used. In this study, the raw material used is mung bean. After grinding, the beans are then sifted through sieves 70, 140 and 200 mesh where the fraction of green beans that passes each sieve was obtained. From the studies, it can be concluded that the best operating conditions of mung bean milling in the ball mill are at 60 minutes grinding time, the weight of the raw material is 45 grams and the number of balls size is 8 medium balls and 6 small balls.
The Characterization of Chitosan-ZnO Nanoparticles Modified Screen-Printed Copper Electrodes as the Analytical Sensor
Authors: Nainggolan I , Saisa  , Agusnar H , Alfian Z
Published: June 2020

Characteristics of chitosan-ZnO-modified screen-printed copper electrodes showed good sensitivity as a sensor which characterized by using cyclic voltammetry. The copper electrode was prepared for the sensitivity testing before being used as a sensor substrate material, the tests carried out in sodium phosphate buffer solution (BSP), the use of BSP as a standard test in this study.
Study on quality of red chilli powder dried by indirect solar dryer
Authors: Romauli N D M , Qadry Al , Sihombing H V , Ambarita H
Published: June 2020

This study aims to assess effectiveness of indirect solar dryer for drying red chilli. The quality parameters were moisture content and colour (L*,a*,b*) values. The results showed the maximum temperature on sunny hours of the day within drying box varied from 52.4°C to 62.6 °C on 3 days drying period with lower final moisture content and better colour of dried chilli powder using Indirect solar drying than dried in the open sun.
Drying Rate of Turmeric Herbal (Curcuma Longa L.) Using Tray Dryer
Authors: Haryanto B , Hasibuan R , Lubis A H , Wangi Y , Khosman H , Sinaga A W
Published: June 2020

This study reports the turmeric of drying operation. Variables that have been compared are size or surface area of the sample, drying air rate and drying temperature. In this case it was found that the effect of increasing surface area would be able to increase the amount of water evaporated from the sample. The effect of drying air flow rate at the same temperature decreases the ability to evaporate air in turmeric samples. This is due to the reduced time of interaction of the drying air with the sample surface. Relatively small temperature variations do not show significant differences. The optimal drying rate is achieved by using drying air temperature at 39°C with drying flow of 4,5 m/s and the turmeric sample with surface area of 0,00525 m2. The effect of this drying variable obtained significantly on the size of the dried turmeric.
The Structure of ℓ
1 in The Space T(Λ, (φn
))
Authors: Herawati E , Ofie M
Published: June 2020

In this work, we introduce the modular sequence space T(Λ, (φn
)) defined by infinite matrix Λ and a sequence of φ-functions (φn
) and study the structure of the sequence space ℓ
1 of all sequence associated with absolutely convergent series in this space.
Effect of cooling water on the glass cover of the double slope solar still
Authors: Ambarita H , William  , Nababan J P
Published: June 2020

Water plays an essential part in human life. In our daily activities, water is something we must consume for our survival. As one of the largest seawater resources country in the world does not guarantee Indonesian citizens of having pure water to consume. Since, most of the water is already polluted by factories, industries and households. The needs of pure water are increasingly needed as the human population gradually increased. One of the technology to produce pure water is solar distillation. This research aims to find out the water productivity results and the efficiency of glass cover cooling by flowing water over the glass cover on passive double slope solar still. The results showed that the actual and theoretical water productivity calculation for this method are 4,36 liters and 7,57 liters. The efficiency for actual and theoretical of the system 52,32% and 90,88% respectively.
Recovery status of mangroves along western coast of Aceh until 7 years after the 2004 Tsunami
Authors: Onrizal O , Mansor M
Published: June 2020

The recovery status of mangroves at west coast of Aceh until 7 years post the Indian Ocean tsunami (IOT) was examined. The field researches were conducted during January 2005 to December 2011 in more than 20 km (1) to record flora species that were resistant to the paroxysm of tsunami swells, and (2) to record and observe the appearance of several existing and new plant species caused by tsunami. The main result shows that (1) mangrove beaches may not recover at all to their original state because the topography has changed greatly and the hydrological and sediment condition differ from their previous conditions, (2) most of mangrove trees dead due to change in habitat environments, (3) some mangrove species in land subsidence coasts were found migrating landward through seed recruitment, naturally, (4) several species of mangroves appear to flourish in the natural stands with mother trees survived against tsunami, (5) new species, for example, Typha angustifolia greatly colonize along the intertidal areas, and (6) Acrostichum aureum (mangrove fern) population occupies an bare lands left by mangrove vegetation communities or abandoned brackish pond. Because mangroves provide bio-shields or natural belts, more lives can possibly be survived during the natural hazard, including tsunamis. Unluckily, due to high market of brackish pond products, severe damage to mangroves was not managed. Therefore, degraded mangroves must be restored and preserved very well in the future.
Forest conservation and management practices in Minangkabau Society: Forbidden Forest
Authors: Onrizal O , Mansor M
Published: June 2020

Before influence of the western nations, the Minangkabau society already had their own systems related to natural protection and conservation. One of the systems is “Rimbo Larangan” or forbidden forest. In this case, prohibition law is determined by the State Council. The forbidden forest is a prohibition area, disallow to cut all plants. Rivers within the forbidden forest cannot be disturbed. All animals within the forbidden forest cannot be hunted. The conservation system was profitable to the local communities and to persist and sustain for the future. However after the Indonesian independence, especially in the period 1945 to 2000, many forbidden forests are damaged and destroyed. This is due to many forbidden forests are changed to production forests by the national government. It should be noted that the forbidden forest system should be re-applied and maintained now, in order to prevent the destruction of forests, loss of biodiversity, particularly due to the global warming. If forests are healthy, the water and air qualities are guarantee. Due to the social conditions, institutions and many rules have changed. Therefore, many future researches are required.
Analyses of land cover change of Singkil Swamp Wildlife Reserve in the last 20 years
Authors: Onrizal O , Maulana M I
Published: June 2020

Singkil Swamp Wildlife Reserve (SSWR) is remaining tropical coastal forested wetland in west coast of Sumatra. The conservation area is also facing habitat loss and destruction due to illegal activities, such as logging and land conversion. However, there is no data available on land cover change of important habitat of great ape critically endangered, Sumatran orangutan (Pongo abelii). This study aimed to determine the rate of change in land cover of the SSRW and to analyze the factors causing these changes in the last 20 years using landsat image. Land cover classification was carried out using supervised classification with maximum likelihood approach. The result showed that primary swamp forest area of the SSWR continued to experience a significant decline every year during the period 1998-2018 that around 24% of primary swamp forest was lost in the period due to deforestation and degradation. Therefore, degraded forests of SSWR should immediately be rehabilitated to restore ecological functions and to increase their productivity as well as education program to increase awareness coupled with forest monitoring and law enforcement to reduce illegal activities. Finally, appropriate management should be applied with co-management between government and local communities in conserving the important conservation areas.
Modelling a simple-vapour compression refrigeration cycle for Fish-Storage boxes
Authors: Nasution D M , Siregar A H , Bukit F R A
Published: June 2020

In this paper, a computerized modelling of a simple single-stage vapour compression refrigeration cycle has been carried out. The aim is to find a cycle performance that is suitable for fish preservation applications. The simulation was completed using the CoolPack software on two different refrigerants and analysed at various condensation temperatures. As a fixed variable, a specific compressor power has been chosen for all cases in meeting the evaporation temperature designed. The results of this study inform the comparison of cycle performance including heat rejection rate, cooling capacity, COP, and pressure-enthalpy diagram. The main conclusion is that both types of refrigerant that are simulated can produce high COP which is useful for handling the cooling load that is later available. The report on this study will be used further to design a fish-storage box.
Activated carbon preparation from bagasse and banana stem at various impregnation ratio
Authors: Misran E , Sarah M , Irvan  , Dina S F , Harahap S A A , Nazar A
Published: June 2020

The effects of impregnation ratio on characteristics of activated carbon from bagasse and banana stem were analyzed. The precursors were impregnated using phosphoric acid (H3PO4) solution as the activator at a ratio of the activator to the precursor (w/w) of 1:1, 2:1 and 3:1. Pyrolisis was conducted at 400 °C for 15 minutes. The results showed that activated carbon from bagasse has better yield, surface area and total pore volume compared to activated carbon from banana stem. The increased of impregnation ratio decreased the yield and surface area, but increased the total pore volume and pore radius. The highest yield of activated carbon from bagasse and banana stem were 61.87% and 45.53%, respectively. Whereas the highest surface area of activated carbon from bagasse and banana stem were 1,070 m2/g and 915 m2/g, respectively. The activated carbon produced from both precursors contained both micropores and mesopores structures.
Comparison of 2 angle collectors with variations 0°, 20°, 30° and trapezoidal groove plate
Authors: Sirait A R H , Hutapea G P , Ambarita H
Published: June 2020

Numerical study of three types of collectors. There is 0°, 20°, 30° of angled two collectors. This simulation finds out which collector will be the most optimum tilt angled solar collector while every collector got same sun’s radiation. The boundary condition is The simulation will be at 3.33° North and 98.39° East (Mechanical Engineering Magister Program, University of North Sumatra, Medan) and The simulation will be on 23 April at 12.30 Measurement point in this simulation are the inlet temperature, the outlet temperature, absorber plate. The most efficient collector is 30°
Study on HPLC Fingerprint of Alpinia katsumadai Hayata
Authors: Wu Hongmei , Kong Juan , Yang Xiaosong , Zhang Lingling , Huang Xulong , Wang Xiangpei
Published: June 2020

Objective: to establish HPLC fingerprint of Alpinia katsumadai Hayata. Method: 10 batches of Alpinia katsumadai Hayata was analyzed by HPLC that the methods were used Diasonsil C18 chromatographic column, with the mobile phase of acetonitrile-0.1% phosphoric acid solution, the flow rate was 1mL/min, the wavelength was 220nm, and column temperature was 30°C. Similarity of 10 batches of Alpinia katsumadai Hayata was evaluated by similarity evaluation software. Result: The HPLC fingerprint of Alpinia katsumadai Hayata was established, and 19 common peaks were determined, the similarity was between 0.995-0.822. It shows that the difference between the 10 batches of Alpinia Katsumadai Hayata was not significant. Conclusion: The analysis method is fast in operation, good in separation, strong in stability and good in repeatability, which can provide reliable basis for quality control of Alpinia katsumadai Hayata.
Analysis of the Causes of Environmental Barriers along the Belt and Road Countries
Authors: Fa Lina
Published: June 2020

The Belt and Road Initiative provides a new path for Chinese companies to go global, but with the increase of host countries’ environmental awareness and the urgency of protecting their own resources, Chinese companies will inevitably encounter national ecological environment risks along the route. At the same time, because Chinese companies ignore environmental protection in the investment process, causing environmental pollution in the countries along the route, people in some countries have questioned Chinese investment. They restricts Chinese enterprise investment and product exports by setting environmental barriers. Some developed countries along the Belt and Road also use environmental barriers as a means of trade protection to protect their own markets and restrict exports from other countries.
Study on the Current Situation and Countermeasures of General Industrial Solid Waste Management in Beijing
Authors: Chen Jiali
Published: June 2020

Based on the present situation of general industrial waste management in Beijing as the research object, analyzed the 2008-2017, the trend of general industrial waste emissions in Beijing, several main waste disposal, the change of the quantity and the comprehensive utilization of the status quo, analysis of a series of problems, put forward three countermeasures of general industrial solid waste management.
Analysis of the Change Characteristics of PM2.5 and PM10 Concentrations in Tianjin
Authors: Yang Yi
Published: June 2020

This paper studied the time series of daily average concentration of PM2.5 and PM10 in Tianjin The time series of daily average concentration were studied to analyze their annual change rules and mutation characteristics, and the annual change rules of PM2.5 concentration and PM10 concentration time series were compared. It is concluded that PM2.5 and PM10 have similar change rules, corresponding policies should be formulated to reduce pollution emission, reduce the pollution emission of heavy industry in winter.
Multi-classification application of Chinese news text based on deep learning
Authors: Xin Siyu
Published: June 2020

As the core of Internet text processing and text mining, text categorization has become a key research issue in the field of natural language processing. The traditional methods mainly focus on shallow machine learning. With the rapid development of deep learning technology, its image recognition and speech A huge research breakthrough in the field of identification, the feature learning ability of the depth model is further proved. This paper is based on the THUCNews data set, combined with word embedding technology, using TextCNN and RNN to achieve multi-classification of text. The experimental results show that the accuracy of TextCNN on the test set reaches 96.04%, and the precision, recall and f1-score of all types exceed 0.9, and the accuracy of RNN on the test set reaches 94.22%, and various types of Precision, recall and f1-score, in addition to the home category, are over 0.9. Comparing the two models, it can be seen that RNN is not very satisfactory except for the classification in the home. Other categories are not much different from CNN, and further adjustment parameters can be used to achieve better results.
Numerical Simulation Study on Temperature Field of Dry Hot Rock Gas Drilling Wellbore
Authors: Yang Sen , Zhang Jie
Published: June 2020

In this paper, gas drilling is used for dry hot rock drilling. According to the first law of thermodynamics and the basic principles of heat transfer, a mathematical model for the temperature field of dry hot rock gas drilling wellbore is established. The model is solved by the full implicit finite difference method. Then, relevant sensitivity analysis was carried out. The model can be used for the temperature distribution of drill string, annulus and formation under actual dry hot rock well circulation conditions.
Parametric Analysis of the In-bed gas flowing calorimetry of metal hydride bed employed in CFETR SDS
Authors: Fan Peng , Fu Wanfa , Wen Ming , Zhang Zhi , Tang Tao , Tang Quan
Published: June 2020

Gas flowing calorimetry is considered to be one of the most promising tritium measurements method in fusion fuel cycles, yet the parametric study of the structure design is still insufficient. In this study, three-dimensional models, combining with commercial computational fluid software, has been used to evaluate the calorimetric performance of tritium storage beds. The effects of structural geometry and cooling method on the heat transfer behavior have been systematically studied. The results show that the proposed model can effectively characterizes the evolution of the temperature difference of the cooling gas with time during the calorimetric process. Typically, increasing number of the U-shaped cooling tubes, thickness of the metal hydride layer and flow rate of the cooling liquid are beneficial for reducing the thermal equilibrium time. When the number of calorimeter bed cooling tubes is 12, the thickness of the metal hydride layer is 23, and the cooling gas is 20 SLMP of CO2, the thermal equilibrium time is only 4.5h. Furthermore, through optimizing the structural parameters, which can have an important influence on calorimetric performance, highly efficient and accurate gas flow calorimeter can be developed in the future.
Evaluation of City Ecological Vulnerability in Shanxi Province
Authors: Ye Qing , Yu Hua , Jin Shaofei
Published: June 2020

Ecological vulnerability assessment is an important basis for comprehensive regional ecological sustainable assessment. Evaluating ecological vulnerability of Shanxi Province, a large coal mine province in China, is helpful for the restoration and construction of the ecological environment and sustainable cities. This paper establishes an ecological vulnerability evaluation index system based on ecological vulnerability research methods, calculates the weight of each indicator through the entropy weight method using the quantitative analysis to obtain the ecological vulnerability of each prefecture-level city, and evaluates the ecological vulnerability of Shanxi Province. The results show that Shanxi Province has a moderately fragile, fragile and extremely fragile land area of 77.39% of the total areas. Cities of Yangquan, Jincheng, and Luliang are in a mildly vulnerable grade. Cities of Taiyuan, Changzhi, Shuozhou and Linfen are at a moderate fragile level. Cities of Datong, Jinzhong, and Yuncheng are at a fragile level of strength. Xinzhou is at a very high level of fragility. Our results imply the status quo of the ecological environment in Shanxi Province is not optimistic.
Policies and Enlightenment of Safe Reuse of Contaminated Sites after Remediation in the United States and China
Authors: Li Xu , Nie Xiaoqin , Shu Tianchu
Published: June 2020

Aiming at a series of problems in the reuse of contaminated sites in China, this paper summarizes the relevant policies for the reuse of contaminated sites in the United States, including contaminated site reuse model, reuse assessment, reuse categories, and reuse innovation projects. It also sorted out the local standards or technical guidelines initially formulated in Beijing, Guangdong. By summing up experience and comparison, it puts forward some enlightenments and suggestions in the safe use of contaminated sites after remediation in China.
Research on the Development of Beijing Suburban Public Transportation Based on SEM
Authors: Jin Tiantian , Zhou Yaodong
Published: June 2020

With the development of urbanization and the general of separation between working site and residence, suburb commuting has become an inevitable demand for the development of the metropolitan area. Existing literature has studied public transport transfer from the aspects of efficiency, accessibility, and satisfaction. This paper attempts to study passenger convenience during the transfer process from a more micro perspective. Based on a sample of 383 valid questionnaires for passengers in the suburbs of Beijing, a structural equation model was constructed to study the influencing factors of transfer convenience on travel choices. The empirical results show that passengers’ perception of the convenience of transfer in the suburban commute is characterized by comfort, safety and quickness, with comfort coming first, then safety, and quickness the last.
Study on the Application of Rainwater Management Technology in the Space of Suzhou
Authors: Ma Jianwu , Yang Yan , Li Shuangqi
Published: June 2020

Chinese sponge city construction is in full swing. The research of regional sponge city technology is not only important but also urgent. This paper takes Suzhou as The main research object. And through the analysis of the specific natural environment and water quality characteristics of runoff in Suzhou, Proposes that “interception” and “purification” should be the primary goals of rainwater management in Suzhou. On this basis, it puts forward that “water quality management is the main and water quantity management is the auxiliary. The management strategy of displaying the characteristics of the city and the landscape of technical facilities. “According to The comprehensive comparative analysis of objective, the conditions, pa., Artistry and ecology of the application of general technology in the United States and China, each technology is classified into three types: It use, Optional use and not it use. It is hoped to solve the confusion of the applicability of sponge technology and the harmony between engineering technology and urban art temperament in a Natural, ecological and landscape aesthetic way.
Research on Industrial Structure Transformation of Hefei City under Low Carbon Background
Authors: Deng Zhijia , Zhou Yaodong
Published: June 2020

Under the background that global warming poses a serious threat to human normal production and life, the development model of low carbon economy is undoubtedly an effective measure to give consideration to ecological protection and economic growth. This paper takes this as the background, through the research on the industrial structure of Hefei, finds out the problems of the low carbon economic structure in Hefei, and puts forward the countermeasures and measures for the transformation of industrial structure with these problems.
Variation Characteristics of PM10 and Its Interaction with Meteorological Effects during 2014-2016, Fuzhou, China
Authors: Li Junyi , Sun Danmei , Huang Yulin , Chen Ye , Lan Yuxiang , Dong Jianwen
Published: June 2020

Air pollution has become worldwide environmental issue in present day. In this study, the concentrations of PM10 was analyzed with hourly datasets, and the data of meteorological conditions were measured per 3 hours from 1st Sep 2014 to 30th Sep 2016 at Fuzhou city in the southeastern China. The mean value of mass concentration of PM10 is 54.65±24.07μg m−3 in the study period. The correlation coefficient between mass concentrations of PM10 and meteorological factors were analyzed, it shows that there existed a negative correlation between PM10 and T (−0.03), RU (-0.27), WS (−0.10), HCC (−0.04), VIS (−0.31), DPT (-0.15) and RF (-0.14). Subsequently, the impacts of typhoons on the mass concentrations of PM10 during September 10th 2016 to September 16th 2016 were analyzed during which the mass concentration of PM10 decreased at a large extent and the particulates have more prominent changes during the typhoon period compared with coarse particulates.
Research on Application of Environmental Design Concept in Industrial Building Design
Authors: Lu Zhengyan
Published: June 2020

With the development of the times and the demands of the broad masses, architectural designers pay more and more attention to the design of small cities. Combined with project design examples, focusing on the theme of green and energy saving in small urban residences, through design concepts, general floor layout, environmental landscape design, new building technology design, sanitary and environmental protection design, and some detailed design, in order to achieve green, healthy, energy-saving, Ecological high-quality living environment.
Analysis of Urban Green Space Landscape Pattern in Suzhou
Authors: Jie Shi , Ma Jianwu
Published: June 2020

Based on the landscape ecological methods, GIS software and aerial images of 2018a, this paper studies the spatial pattern of urban green landscape of Suzhou via landscape ecological theory. The green landscape was consists of several kinds of patches according to the size. Landscape ecological indexes such as the number of patches, landscape fragmentation, and landscape separation were selected to study the landscape pattern of green space in the main urban area of Suzhou. The results show that the biggest green area is in Wuzhong District, the minimum is Gusu District; the green landscape fragmentation of Gusu Districtis is the highest, but the lowest is in Wuzhong District; the landscape separation degree is the largest in Wuzhong District, and the industrial park is the smallest. Comprehensive analysis shows that the landscape pattern of green space in Wuzhong District is more desirable. Finally, some suggestions are given on how to optimize the green space construction in Suzhou.
Discussion on the Conversion Method of Soil Enzyme Stoichiometry from Different Vegetation Types in Guizhou Grassland, Southwest China
Authors: Yang Fuli , Ding Leilei , Zhang Yujun , Wang Puchang , Liu Jiajia , Zou Chao , Chen Chao
Published: June 2020

Soil extracellular enzymes play an important role in regulating the circulation and fixation of soil nutrients, and their stoichiometric ratio reflects the demand of microorganisms for nutrients and the supply of nutrients in the environment, so it has been widely concerned. In this study, the soil C-, N- and P-acquiring enzyme activities (β-1, 4-glucosidase, BG; β-1, 4-N-acetylglucosaminidase, NAG; leucine aminopeptidase, LAP; acid phosphatase, AP) in the upper 30 cm of soils were investigated under three vegetation types (white clover grassland, fescue grassland and natural grassland) to explore the optimal enzyme stoichiometric conversion method. The results showed that the data converted from [asin (βG/[βG + AP])] or [asin (βG/[NAG + LAP])] were more suitable to the normal distribution in general. The response of different soil enzyme conversion methods to soil depth was different. The conversion from [asin (βG/[βG + AP])] or [asin(βG/[NAG + LAP])] in 0-20 cm was more suitable to normal distribution, and the transformation of [ln (P/[1 - P])] was more suitable to normal distribution at 20-30cm. The response of different soil enzyme conversion methods to vegetation type was also different. The conversion from [asin (sqrt [βG/(βG + AP)])] or [asin (sqrt [βG/(NAG + LAP)])] was more suitable in fescue grassland, that of [ln (P/[1 - P])] was more suitable in white clover grassland, and that of [βG/AP]) or [βG/(NAG + LAP)] was more suitable in natural grassland.
Soil Image Segmentation Algorithm under Complex Background
Authors: Ma Yan , Zhang Yongru , Yang Shengming
Published: June 2020

In order to solve the problem of foreground and background segmentation of soil images under complex backgrounds, this paper proposes an image segmentation algorithm that combines colour features and local blur characteristics. First, the collected field soil images are converted from the RED colour space to the HSL colour space and the H component features are extracted. The H component is then converted to the CIELAB colour space. The b* component image is selected as a binary value based on the soil colour characteristics Pre-processing of H component. Then, the image fusion is performed according to the H component features, the b* binarization result, and the H-component local fuzzy variance pre-processing result to obtain a fusion result. Finally, in order to solve the hole problem in the segmentation result, the fusion result is subjected to boundary recognition and maximum boundary extraction, and the obtained maximum boundary region is filled to obtain the final image segmentation result. In order to test the segmentation effect of the proposed algorithm, Otsu is used to perform threshold segmentation on the soil image. The average time consumption of the two algorithms is 2.360 and 4.48. Comparing the time consumption of the two segmentation algorithms and the segmentation effect of the soil image, the experimental results of the proposed algorithm are significantly better than the Otsu segmentation algorithm.
Method Statement for Reconstruction / Strengthening of Existing Nullah Structures for Tsui Ping River
Authors: Cai Lixu
Published: June 2020

Revitalization of Tsui Ping River project needs demolition part of nullah structures and reconstruction of it. According to the particular specification and Drainage Service Department requirement, fully closure of Tsui Ping River are not allowed. Any construction work for the river bed in the wet season need to get approval. This article shows the method statement for reconstruction/strengthening of existing nullah structures for Tsui Ping River.
Research on the Construction of Collaborative Innovation Ecosystem in Hefei’s “Innovation Capital”
Authors: Wang Zhe
Published: June 2020

The collaborative innovation ecosystem belongs to a new innovation management mode, and building a dynamic collaborative innovation ecosystem is an important prerequisite and guarantee of urban collaborative innovation. Based on the theoretical research of collaborative innovation ecosystem and the analysis of its basic characteristics and operating mechanism, the paper constructs the innovation ecosystem model of Hefei National Science Center based on the theory of symbiosis, and makes a concrete analysis of the operation mechanism. Finally, the specific safeguard measures of constructing a collaborative innovation ecosystem are discussed in connection with Hefei.
Wet Oxidation Technology Based on Organic Wastewater Treatment
Authors: Zhang Yongxun
Published: June 2020

Wet oxidation technology is a kind of advanced oxidation technology, which is suitable for the treatment of high concentration, toxic, harmful and biodegradable organic wastewater. WAO technology has been effectively applied in the following wastewater treatment: cyanide wastewater, sulfur wastewater, paper black liquor, municipal sludge, pesticide wastewater, coal gasification wastewater and activated carbon regeneration. (2) chemical reaction between dissolved oxygen and matrix. The front part of WAO reaction is controlled by oxygen mass transfer and the back part is controlled by reaction kinetics. It is generally believed that the WAO reaction mainly belongs to the free radical reaction, which goes through four stages of induction, proliferation, degradation and termination. The reaction temperature is the main factor affecting the wet oxidation reaction.
Exploration and Conception of Legal Guarantee of Carbon Emission Trading
Authors: Yao Jiejing , Peng Hui
Published: June 2020

In accordance with the direction and requirements of market-oriented, rule of law and internationalization, and in combination with the development practice of China’s carbon market, we will further improve the existing carbon trading system, and study and expand the scope of control and increase the intensity of control. Enhance the policy and regulation of the targeted, operational, promote enterprises, organizations and the public to better fulfill the carbon emission reduction responsibilities, and then form a shared good ecological environment of the social atmosphere. We actively respond to climate change to make greater contributions, to further promote the development of green & low-carbon and beautiful environment, for the construction of carbon market at home and abroad.
Soil Nutrient Content Distribution in Gully in Loess Hilly Region
Authors: Meng Tingting , Wei Jing
Published: June 2020

In order to find out the distribution of soil organic matter, total nitrogen and total phosphorus contents in gully in loess hilly region and the difference between gully and slope, 29 and 58 samples were taken from gully and slope in Yuanzegou small watershed respectively. The results showed that the contents of total nitrogen, total phosphorus and organic matter in the 0-60cm soil layer ranged 0.091~0.628g/kg, 0.402~1.388g/kg, and 0.826~6.550g/kg respectively. According to the results of the second national soil census, the total nitrogen and organic matter content in the gully are at the lower level of grade 6, the total phosphorus content is at the higher level of grade 2, and the variation coefficient ranges from 21.6% to 33.4%, which is moderate. Pearson correlation analysis shows that soil total nitrogen, total phosphorus and organic matter contents are positively correlated with slope direction and elevation, negatively correlated with slope, and weakly correlated with soil moisture content, clay content and silt content, and negatively correlated with sand content. 0-20cm, the organic matter contents in the gully was higher than that slope 7.19%; 20-40cm and 40-60cm, the organic matter content in the gully was lower than that slope 4.66% and 12.67% respectively, but there was no significant difference. 0-20cm, 20-40cm, 40-60cm, the content of total nitrogen and total phosphorus in gully were higher than that slope, and the total nitrogen content was higher 24.31%, 13.04% and 8.70% respectively, with significant difference only in 0-20cm (p<0.05); The total phosphorus content was higher 15.68%, 13.56% and 15.11% respectively, with significant differences (p<0.05).
Analysis of Distribution of Mineral Resources and Status of Soil Pollution in Shaanxi Province
Authors: Luo Yuhu
Published: June 2020

Shaanxi Province has a variety of geological structures and abundant mineral resources. As the main driving force for regional economic development, mineral resources will inevitably cause environmental pollution in the mining process, especially the serious pollution of the mining area and surrounding soil. According to the distribution characteristics of mineral resources in Shaanxi Province, this paper makes a detailed analysis of soil pollution caused by mineral resources.
Current Situation and Development Countermeasures of Water-Saving Irrigation in Agriculture in China
Authors: Zhang Panpan
Published: June 2020

China is short of water resources, uneven spatial and temporal distribution, and low utilization rate of agricultural water, the development of water-saving agriculture is imperative. This paper briefly reviews the development process of water-saving agriculture in China, analyzes the problems existing in water-saving agriculture irrigation at the present stage in China from the aspects of technology, policy, fund, management, talent and concept, and puts forward the corresponding development countermeasures.
Status Analysis, Path Exploration and Policy Enlightenment of Zhejiang Province’s Manufacturing Green Technology Innovation
Authors: Ma Sheng , Zhu Mengqin , Yang Yan , Song Huaitong , Du Wei , Li Zijian
Published: June 2020

Manufacturing industry is an important economic force in China’s industrialization process, but the rapid and extensive development model has caused great damage to the ecological environment and has become a major shortcoming in China’s current economic transition to high-quality development. The analysis of the problems of green technology innovation in the manufacturing industry in Zhejiang province mainly includes: insufficient green innovation mechanism, insufficient maturity of green innovation organization, insufficient support for green innovation, and breakthroughs in green innovation technology. Then we select typical enterprises to explore and draw conclusions: Green innovation strategy includes forward-looking green innovation strategy and reactive green innovation strategy, which promotes green innovation behaviors such as products, technology, and equipment through value guidance and strategic guidance, and then creates and realizes corporate performance. Finally, targeted policy suggestions are given according to the empirical results.
Effect of Sophora Davidii Skeels and Pennisetum Sinese Roxb Intercropping Systems on Soil Nutrients and Evaluation of Comprehensive Fertility
Authors: Zhang Yujun , Zou Chao , Ding Leilei , Wang Puchang , Yang Fuli , Mo Zhiping , Long Zhongfu , Gao Birong , Wang Qingshi , Zhang Wen , Wei Xin , Liu Jiajia
Published: June 2020

In this study, field experiments were used to set three cropping patterns: Sophora davidii Skeels monocropping pattern, Pennisetum sinese Roxb monocropping pattern, S. davidii and P. sinese intercropping pattern to explore the effect of different cropping patterns on soil nutrients and fertility. The results showed that the soil moisture content under different cropping patterns in the 0-30cm soil layer was as follows: S. davidii and P. sinese intercropping>P. sinese monocropping>S. davidii monocropping, and there were significant differences between different cropping patterns in the same soil depth (P<0.05); soil pH increased gradually with the increasing depth in soil, and the difference between different cropping patterns in the same soil depth was significant (P<0.05); S. davidii and P. sinese intercropping 0-10 cm soil layer of organic matter, total nitrogen, total phosphorus, available nitrogen and available phosphorus were significantly higher than that of S. davidii and P. sinese monocropping (P<0.05); In the 0-20cm soil layer, the ammonium nitrogen in P sinese monocropping pattern was significantly higher than that in S. davidii monocropping and S. davidii and P. sinese intercropping, while in the 20-30 cm soil layer, intercropping were significantly higher than that in the monocropping (P <0.05); in the 0-30cm soil layer, S. davidii monocropping pattern was significantly higher than P. sinese monocropping and S. davidii and P. sinese intercropping (P <0.05) (except for that of the P sinese monocropping 10-20 cm). The quality of soil integrated fertility index (FQI) showed that the rank of FQI value in the 0-30 cm soil layer was as follows: S. davidii and P. sinese intercropping>S. davidii monocropping>P. sinese monocropping. These fingdings suggest that the S. davidii and P. sinese intercropping could effectively improved 0-30 cm soil comprehensive fertility.
Experimental Study on the Treatment of Organic Wastewater Containing Iron with High Efficiency Flocculant
Authors: Li Fang , Jin Jianjiang , Li Suqin
Published: June 2020

The treatment of industrial wastewater containing Fe3+ by the new high efficiency compound flocculant MD-816 was discussed. The effects of flocculant dosage, pH value and stirring rate on the removal of COD, ammonia nitrogen and Fe3+ were discussed. The results show that when the dosage of flocculant is 200 mg.L-1, the pH of waste-water is 5, and the stirring rate is 250r/min, the removal efficiency of Fe3+ in industrial iron containing waste-water is better, the removal rate of Fe3+ is 99.99%, the mass concentration of Fe3+ is 0.043 mg.L-1, the removal rate of COD is 76.27%, the lowest is 51.16 mg.L-1, the removal rate of ammonia nitrogen is 93.28%, the lowest is 7.92 mg.L-1. The treatment effect meets the requirements of the maximum allowable discharge mass concentration (Fe3+ ≤ 0.1mg.L-1, COD ≤ 100mg.L-1, ammonia nitrogen ≤ 10mg.L-1) in the integrated waste-water discharge standard (GB 8978-1996).
Image Acquisition Based on Handheld Portable Printer - Image Tilt Correction
Authors: He Zhao , Luan Fengkai , Huang Mange
Published: June 2020

At present, there are various algorithms for image tilt correction. However, there are some shortcomings and shortcomings in the current application of images acquired by handheld portable printers. The research in this paper is mainly aimed at the image acquired based on the handheld portable printer, which has the reason that the angle of the image acquisition angle is artificially manipulated or the image itself is tilted, which leads to the problem of tilting or see-through deformation. Other uncertain factors such as the light source during the shooting process result in low signal-to-noise ratio, low definition and low contrast, and the image is preprocessed first. The histogram equalization method is used to enhance the image, and the maximum inter-class variance is used to calculate the optimal threshold for binarization. The preprocessed image is subjected to image tilt correction based on projection analysis. The result proves that this method has high accuracy and adaptability to the image tilt correction of the printer.
Design of a Magnetic Negative-stiffness-damper for Vibration Isolation
Authors: Zhou Hangfei , Xie Shaorong , Sun Yi
Published: June 2020

This paper presents a novel low frequency vibration isolator. The isolator is mainly composed of a coil spring, two permanent magnets and a number of copper plates of different thickness. The negative stiffness provided by the two permanent magnets is offset by the positive stiffness of the spring, thus reducing the natural frequency of the system and broadening the isolating bandwidth. When the magnet moves, it creates eddy current damping on the copper plate. The movement of the permanent magnet and copper form a viscous damper. This makes up for the disadvantage that the isolator cannot dissipate the vibration energy. Principle of the novel vibration isolator is introduced. The optimum configuration of the vibration isolator was obtained by experiments.
Design of High Power EMI Filter for Anechoic Chamber
Authors: Xin Zhonghua , Zhang Xiaodong , Tao Liu , He Chen
Published: June 2020

This paper analyzes the filter requirements of high voltage and high power anechoic chamber and proposes a design method of high power EMI filter for anechoic chamber. The EMI filter adopts the PI type filter network structure and security mechanism. On one hand, it guarantees the shielding effectiveness of the anechoic chamber. On the other hand, it effectively reduces the leakage current of the filter and ensures the safety of the filter. The validity of the EMI filter is verified by taking the 10kV filter as the experimental object.