bluuebunny/crossref_metadata_2025 huggingface dataset:
The Market Position of Community-Based “Salak” Agrotourism in Yogyakarta Province
Authors: Indrayanti Temy , Jamhari  , Handoyo Mulyo Jangkung , Masyhuri
Published: October 2020

Agrotourism is a product in which its development needs to be accelerated because mostly located in rural areas, therefore, positive impacts are expected to emerge for the growth and development of rural economy. This research was aimed to know the market position and to formulate the community-based Salak Agrotourism development strategy in Yogyakarta Province. A descriptive qualitative method was used as the research method by implementing Boston Consulting Group (BCG) as the analysis instrument. It measured the rate of market growth and relative market share of the community-based ‘Salak’ Agrotourism toward non-community-based ‘Salak’ agrotourism in Yogyakarta Province. According to the results of BCG analysis, the market position of community-based ‘Salak’ Agrotourism in 2014 was in Question Mark position and in 2015 was in the Star position. Furthermore, in 2016 and 2017, the market position of community-based ‘Salak’ Agrotourism was in Cash Cow position. The Agrotourism development strategy that can be conducted is the concentric diversification strategy by developing and focusing on the Unique Selling Proposition (USP) in each agrotourism.
Indonesian Organic Farmers: The Long Journey of Farmers’ Groups Towards Organic Farming Sustainability (A Case Study in Rukun Farmers Group, Yogyakarta)
Authors: Irham  , Wahyu Widada Arif , Nurhayati Azizatun , Anantasari Esti , Yustika Devi Laksmi , Subejo
Published: October 2020

The Rukun farmer group is the first organic farmer group formed in the Yogyakarta region. The Rukun farmer group started organic cultivation through local varieties of rice cultivation in 2006 and received organic certification in 2011 and 2015. The Rukun farmer group became a representative farmer group as a sample in this study in order to identify the issues of organic farming. The challenge faced by organic farmer groups at the moment was the limited support of both funding and managerial parties. This study aim was as one of the preliminary studies to further formulate policies and steps that must be taken to achieve the sustainability of organic farming in the future. The results of the research show that the main managerial aspects of recording were problems that need to be resolved. Farm records based on a web application was expected to be one of the solutions to the problem of managerial aspects. The research was essential as a baseline study to formulate strategic advice to create sustainable organic agriculture in Yogyakarta.
Effects of mastitis on milk production and composition in dairy cows
Authors: Wahyu Harjanti Dian , Sambodho Priyo
Published: October 2020

Mastitis is the biggest economic problem in dairy industry. Mastitis also causes animal welfare problem and it is a thread to food safety and security. A baseline survey involving small-holder dairy farms was conducted to identify the correlation between mastitis (mammary inflammation) and cow’s productivity. The performance of cows, in terms of milk production, milk composition, as well as mammary inflammation levels were observed. The research was conducted in Central Java, Indonesia. A total of 103 lactating cows in the 2nd to 3rd month of lactation and parity were used. California Mastitis Test was used to analyse the inflammation level of mammary gland. Milk protein, fat and lactose contents were determined with Lactoscan Milk Analyzer. Milk production was recorded daily at morning and evening milking. The result shows statistically negative correlation (P<0.0001) between the level of mammary inflammation and milk production (r = -0.59) as well as milk protein (r = -0.55), lactose (r = -0.51), and fat contents (r = -0.46). It is concluded that, when the mammary infection in cows increased, milk production and milk components will be decreased.
Feed efficiency, serum indices and selected intestinal bacteria of the Indonesian indigenous crossbred chickens provided with the blends of butyric acid and Bacillus subtilis
Authors: Sugiharto Sugiharto , Isroli Isroli , Murwani Retno , Widiastuti Endang , Sartono Tri A. , Wahyuni Hanny I. , Yudiarti Turrini
Published: October 2020

Feed efficiency, serum indices and selected intestinal bacterial population were evaluated in the Indonesian indigenous crossbred chickens (IICC) following treatments with the blends of butyric acid and Bacillus subtilis in the rations. A total of 200 of the IICC were randomly distributed to four dietary treatments including CNTRL (basal diet without additive), BTRT (basal diet added with 0.1% butyric acid), BACIL (basal diet added with 0.02% B. subtilis) and BTRBAC (basal diet added with the blends of 0.1% butyric acid and 0.02% B. subtilis). Weight gain, feed intake and feed efficiency of the IICC were recorded weekly. Blood was collected on week 8, and after which the chicks were slaughtered. Immediately, the digesta was obtained from the ileum and caecum of the IICC. Our findings showed that treatments improved (P<0.05) feed efficiency, feed cost per gain and income over feed cost of the IICC. However, the dietary treatments had no impact (P>0.05) the antioxidative status (serum malondialdehyde dan superoxide dismutase), antibody titer toward Newcastle disease vaccine, serum biochemical indices (cholesterol profile, total protein, albumin, globulin, uric acid) and the numbers of lactic acid bacteria and Enterobacteriaceae in the ileum and cecum of the IICC. In conclusion, dietary supplementation of butyric acid, B. subtilis or the combination of both improved the economic performance of the IICC.
Response and Allelochemicals Content of Two Sorghum Varieties to Manure
Authors: Harsono Puji , Setyowati Nanik
Published: October 2020

Sweet sorghum can be used to support the needs of food, feed, and energy. The specific objectives are to determine the performance of different varieties of sorghum, to determine the best dose of manure for growing sorghum, and to study the interaction between combined fertilizer and varieties of sorghum in coastal land. Research was arranged in randomized factorial design with three replications. The first factor consisted of two varieties of sorghum includes Numbu, and Kawali, and the second factor is combination of fertilizers consisted of solid cow manure 10 ton ha−1 + ½ of recommended dose of mineral fertilizer, cow’s urine (200 ml urine in 15 L of water) + ½ dose of recommended dose of mineral fertilizer, and mineral fertilizers as recommended dose (120 kg ha−1 of Urea, 90 kg ha−1 of superphosphate, and 60 kg ha−1 of KCl). The results showed that the best preformance on growth and yield was obseved on Kawali with fertilization using solid cow manure 10 ton ha−1 + ½ of recommended dose of mineral fertilizer. Results of sorghum root analysis with GCMS showed results that Numbu and Kawali detected hydroquinone and resorcinol as intermediate compounds Sorgoleone potential as bioherbicides
Farmers’ attitude to standard production method based on Temanggung robusta coffee’s geographical indication
Authors: Ihsaniyati Hanifah , Setyowati Nuning , Phitara Sanjaya Aditya
Published: October 2020

Temanggung Regency is one of the main producers of coffee in Central Java Province. Robusta coffee originating from this area has the potential to become a specialty coffee because it has a distinctive taste character that is indicated because of geographicaal factor. In an effort to improve competitiveness and protect their coffee, coffee farmers are motivated to produce and do post-harvest based on Geographical Indications (GI) standard. However, only around 170 farmers who implement production methods (on farm); harvest and post-harvest; and processing in accordance with standards. Attitudes are thought to have an important role in the behavior of these farmers. This publication will deliver part of the research results, namely the importance of farmers’ attitudes towards coffee production methods (on farm) that are appropriate to GI. For this reason, this study aims to analyze the attitude of farmers to the standard production methods according to the GI of Temanggung Robusta Coffee. The study was conducted in Kandangan Sub-district where the location of the MPIG-KRT secretariat was located. Respondents were 80 coffee farmers who were taken by simple random sampling. Data was collected by questionnaire, independent interview, observation, and documentation recording. The results showed that 1) the majority (51.25%) of farmers had good attitudes and 45% were very good towards the standards of coffee production methods, 2) There was a significant relationship between the influence of others and farmers’ attitudes toward the standard production methods, but there was no significant relationship between age, formal education, and non-formal education with the attitude of the farmer.
A strategy for development of shallot Agribusiness Sub Terminal (STA) in Brebes
Authors: Susanawati  , Fauzan Muhammad , Widodo
Published: October 2020

This study aims were to (1) Identify internal and external factors that influence the development of shallot STA in Brebes Regency (2) Formulate a strategy for developing STA in Brebes Regency. The analytical method used in this study was a SWOT. The samples used in this study were 8 STA administrators, 2 Agriculture and Forestry Service Officers and 20 shallot farmers using the purposive sampling method. The results showed that the external factors that became an opportunity for the STA were the support from the government towards the STA, the number of shallot farmers in the regency of Brebes, the large number of food processing industries made from shallots. Moreover, the threat of the STA was the decline in farmer’s land productivity, competitors provide selling stalls for farmers, and competitors provide capital for farmers and the large number of competitors spread in Brebes Regency. Three priority strategies for the development of the STA, namely cooperation with financial institutions, improve the organizational and optimize the use of stalls.
Determination of rice expiration time based on microbiological contaminant
Authors: Hadipernata Mulyana , Hidayah Nikmatul , Nugraha Sigit
Published: October 2020

Information on expiration time of rice on packaging labels is needed to provide quality assurance to consumers. The research aimed to find out the expiration time of rice from the microbiological aspect of rice. Rice samples used was Ciherang varieties. Rice was packed using 3 types of packaging, sacks, non-vacuum plastic and vacuum plastic. Rice was stored in two different places, air-conditioned rooms and room temperature. The results showed that mold and yeast contamination in Ciherang Rice up to 8 months’ storage are still below the required standard.
The Effect of Packaging Materials Type and Addition of Turmeric (Curcuma Domestica) Flour on Calf Starter Pellet to The Total of Fungi, The Existence of Gram Negative Bacteria and Aspergillus Flavus
Authors: Dwi Rahmawati Ranita , Mukodiningsih Sri , Setya Utama Cahya
Published: October 2020

The purpose of the research was to examined the effect of packaging material and the addition of turmeric levels on the calf starter pellet to the total fungi, the presence gram negatives and Aspergillus flavus at 56 days. The method was used the pelleting process. The research used a CRD with factorial pattern (3x2) and 3 replications. The first factor was the addition of turmeric flour (w/w) (0%, 0.6% and 1.2%) and the second factor was the type of packaging material (plastic and paper). Data on the total of fungi were analyzed using ANOVA, while data on the presence of gram negative bacteria and Aspergillus flavus were analyzed descriptively. The results showed that there was no interaction effect between the first factor and the second factor to the total fungi. Gram negative bacteria were still found on the pellets in all treatments. Whereas Aspergillus flavus was only found at the level 0%(plastic) and 0,6%(paper). The conclusion was the addition of turmeric levels in the calf starter pellet who were packaged with plastic and paper have not been able to inhibit the growth fungi and gram negative bacteria, but can inhibit Aspergillus flavus at the turmeric flour level of 1,2%.
Economic Performance of Madura Beef Cattle Industry in Sapudi Islan
Authors: Kisroh Sunyigono Andrie , Suprapti Isdiana , Arifiyanti Nurul
Published: October 2020

Madura beef cattle is a productive species and has high economic contribution. The farming system has uniqueness compared to other beef cattle farming systems. This study was conducted in Sapudi Island as main producer of madura beef cattle. The aims of the study were: 1) to analyze the status of the madura beef cattle industry; 2) to identify the critical aspects in madura beef cattle farming system in small island; and 3) to analyze the economic performance of madura beef cattle. The primary data were collected from the farmers and other actors through interviews using questionnaires. Descriptive analyses were used to analyze the data and phenomenon as well as operational efficiency ratio. The result indicates that the population of beef cattle in Sapudi was 39,977 heads and the number of families in this island was only 18.003 families. They raise the madura beef cattle with traditional technology. The critical aspects are: 1) lack of feed availability mainly forage. The farmers buy forage from Situbondo-East Java, 2) they always move their cage periodically to have more fertile land for their farmland. The economic performance of madura beef cattle is high. It is indicated by the positive operational efficiency ratio.
Sustainability Index of Dryland Paddy Natural Farming System in the Border Area of Morotai Island
Authors: Rope Ranita , Handoyo Mulyo Jangkung , Masyhuri  , Rahayu Waluyati Lestari
Published: October 2020

Natural farming system is a reality exists and holistic agricultural system. The purpose of this research was to examine the sustainability index of socio-cultural, economic and environmental dimensions. An indicator based analysis method was employed, adapted from the study of Sustainability Assessment of Farming and the Environment (SAFE) model and the farmer’s sustainability index (FSI) model. The research was conducted on 224 respondents in Morotai Island. This research formulated 13 indicators which were developed and modified based on agricultural sustainability consensus and various researches’ findings and adapted to specific potential condition of local area in preservation of dryland paddy natural farming system. Using the analysis instruments of MDS and Rap-Farm, the analysis presented the feasibility of MDS-Rap-Farm analysis from the perspective of Stress and R-square values, Rap-Farm Ordination, viewing leverage of attributes, validity test with Monte Carlo analysis and prospective analysis methods as the direction of recommendation for sustainability preservation of dryland paddy natural farming system in Morotai Island border area. Therefore, the dryland paddy natural farming system in Morotai Island border area is a reality exists sustainable and holistic which economically dimension, socio-cultural dimension and environmental dimension.
Research of Economic Operation and Control Strategy for PV-Storage-Charging Integrated Power Station
Authors: Shi Zhong , Ding Jide , Liu Shuguang , He Juntian , Ma Zhenfei , Gao Chuanzhan
Published: October 2020

This paper proposes an economic operation mode and control strategy for an PV-storage-charging integrated power station. By optimizing the capacity configuration and analyzing the mechanism relationship of its various operating modes, this paper establishes the system model including PV system power, energy storage SOC and charging spot power, and gives its economic operation constraints. Based on statistical analysis of historical data, the strategy optimizes the operation mode dynamically to control the grid power flow and balance the system power supply and load. Simulation results verify the economic and stable operation of this strategy.
Environmental protection in the exploitation and use of space resources
Authors: Xu Fengna
Published: October 2020

Space resources activities are per se ultra-hazardous activities, which may be harmful to both outer space and the Earth environment. At the dawn of space mining, however, predominant in space mining missions is wealth and technology perspective. Environmental protection, has not been an important consideration. The principle of sustainable development and the new ecocentric approach could help to make a correct balance between protecting environment and promoting industrial development. But many obstacles of environmental protection do exist, such as inadequacies of the current space law, difficulties in practice, ethical dilemma in planetary protection. Thus, for promoting sustainable exploitation and use of space resources, this article suggests some solutions, including: 1) strengthening the legal regime; 2) promoting international cooperation; and 3) developing the appropriate ethic.
Construction And Application of Investment Execution Analysis Index System for Distribution Network Infrastructure Projects
Authors: Liu Hongxin , Ma Lei , Wen Fan , Qian Xiao , Song Hongfang , Zhu Peihong , Pan Yongchang , Ye Juwei
Published: October 2020

With the slowdown of external economic growth, more stringent review of investment execution, and in-depth promotion and implementation of transmission and distribution price reform, the implementation of lean management of state grid investment has been accelerated. The improvement of lean management level of 10kV projects, which account for more than half of the investment in power grid infrastructure, plays a greater role in promoting the overall investment efficiency of power grid. The lean management of power grid investment emphasizes “scientific decision making before investment - precise implementation in the event - scientific evaluation after the event”. From the perspective of investment lean management - strengthening the precise implementation in the matter, this paper takes the power grid infrastructure projects of 10kV and below as the research object, through combing the management key points and relevant management requirements of key nodes in the whole process, from the aspects of compliance, rationality and effectiveness of investment execution, this paper sorts out and determines the investment execution analysis indicators and evaluation rules, which provides the basis for the next step of investment execution index scenario application, and also provides support for comprehensively improving the lean management level of investment in 10kV and below power grid infrastructure projects.
Global Clean Energy Governance Mechanism Research - Based on power model
Authors: Qiao Shuang , Wang Pan , Bai Yang
Published: October 2020

Since the 21st century, global clean energy governance has developed rapidly and gradually attracted the attention of scholars at home and abroad as an emerging field. The development and utilization of the global Clean energy Governance Network has greatly promoted the development of social productive forces, promoted economic globalization and scientific and technological progress, deepened the interdependence of energy and economy among countries around the world, and consolidated the foundation of cooperation among them. At present, the global clean energy governance presents a state of “disorder” with multiple mechanisms superimposed on each other, and is faced with many governance difficulties and dilemmas. By building a global clean energy governance network model, this paper tries to solve the stability and balance of multiple participants in the governance network. On the basis of win-win cooperation, countries should clarify their responsibilities and obligations and work together to promote clean energy governance. We should accelerate the transformation and upgrading of the global energy mix and explore a path of green, clean, low-carbon, environmentally friendly, healthy and sustainable energy cooperation.
Numerical Simulation and Risk Analysis on Large-Scale Oil Tank Farm Conflagration Based upon FDS
Authors: Wu Jie , Zhu Hanhua , Hu Yiming
Published: October 2020

With regard to the oil characteristics of volatility and fluidity, safety issues may occur in case of oil tank leakage, conflagration and even explosion. In this thesis, the fire dynamics simulator (FDS for short) was used to simulate the conflagration of a 5000m3floating-roof oil tank. By simulating and calculating the oil tank conflagration, it obtained the effect of the distribution principle and the ambient wind speed in the thermal radiation field on the distribution principle in the radiant heat field. In comparison of the heat flux failure criteria at home and abroad, the safe intensity threshold between adjacent oil tanks was analyzed when the conflagration occurs on single oil tank. Then it came to a conclusion that, latent risk exists in current domestic fire separation distance 0.4D, which couldn’t meet the safety requirement on adjacent oil tanks. Meanwhile, it analyzed the distribution principle of the radiation thermal field in single floating-roof oil tank conflagration, and obtained the minimum safety distance of adjacent oil tanks at various ambient wind speeds, thus providing reference standards and scientific proof for designing safe tank farm as well as controlling the danger sources.
Rural Household Energy Consumption Investigation and Structural Pattern Analysis of Xuanwei study area in Central Yunnan
Authors: Ling Yuan , Shu Gan , Wenchang Li , Lin HU
Published: October 2020

Rural household energy utilization is an important consumption that related to the survival and development of regional rural residents. With the deepening of the strategy of poverty alleviation and rural revitalization in China, the problem of energy consumption in rural households has become the focus of attention. In this paper, Xuanwei County, which is typical representative in Central Yunnan, is selected as the research case. Through the field investigation and questionnaire survey, the energy consumption status and structure pattern of rural households in the mountainous areas of the Central Yunnan Plateau are analysed and studied by using the methods of statistical perspective analysis and data induction and sort out. The main results are as follows: 1) In Central Yunnan, the current situation of rural household energy consumption is belong to the “electricity+” hybrid basic structure pattern, which is mainly based on electricity and combined with coal, fuel-wood, straw and so on to be of the diversified structure energy consumption characteristic. 2) Though there are 13 kinds of rural household energy consumption hybrid patterns in the study area, but only six kinds is found belong to dominant hybrid energy utilization structure patterns, namely, “electric-coal-firewood”, “electric-firewood-straw” and “electric-coal-straw”, “electric-firewood” and “electric-coal”, as well as “single electricity” utilization type of energy mixed mode. In general, through the rural household energy investigation analysis is only completed in Xuanwei case, the general characteristics and its structural pattern in Central Yunnan can been obtained in the same thing. So the results will be helpful to guide the formulation of rural energy policy and management optimal utilization of regional rural energy in Central Yunnan and promote the implementation of National Rural Revitalization and Precision Poverty Alleviation Strategy.
Study on the Safety Risk Prevention Technology for the Urban Gas Pipeline
Authors: Zhou Jixiang
Published: October 2020

Along with the continuous development of our society and economy, the process of urbanization has been pushed forward. As one of the indispensable links in urbanization construction, the gas pipeline has brought great convenience to the life of urban residents, while has some potential safety hazards and brings certain risks to the life, property and safety of urban residents. The management status of the urban gas pipeline and safety risk prevention measures are mainly analyzed in this paper.
Research on inversion method with multi-transceiver distance in underground space based on apparent conductivity
Authors: Mingyou Zhong , Bo Zhang , Leixiang Bian , Xiaoli Rong , Chenli Cui , Jiayang Li , Songtong Han
Published: October 2020

The layered ground under the excitation of a harmonic magnetic field will generate a secondary magnetic field. On the condition of low induction number, the apparent conductivity can be obtained by using the normalized secondary field measured by the instrument directly. By discretizing the integral of relative response function density, the expression of contribution value of conductivity of each layer to the apparent conductivity can be obtained. By using multiple sets of transceiver distance, we can obtain different apparent conductivity observation equations, then the conductivity and thickness of each layer can be solved by Gauss-Newton method. A three-layer medium model containing a V-shaped tunnel is designed for inversion simulation calculations. The results show that the higher the SNR of observed signal, the more stable the inversion result. The maximum relative error of thickness is about 10%.
Quality Control in Construction and Maintenance Process of Highway Mechanical and Electrical System Based on Weibull Distribution Model
Authors: Liwei Zhu , Liqing Wang , Jianping Li
Published: October 2020

The quality of Highway Mechanical and Electrical System (HMES) in construction and maintenance process is considered as the key link to ensure the highway operational safety and service level. In this paper, the quality control model in the construction and maintenance of HMES based on Weibull distribution model is provided and the quality control procedure which includes the data collection, parameter estimation, key devices/equipment and indexes determination, and quality control, is provided. In the end, the cameras of CCTV system in the surveillance and control subsystem of HMES is employed to verify the effectiveness of the proposed quality control model.
Development of Pollution Treatment Technologies for Coal Storage Yards in Thermal Power Plants and Case Study
Authors: Si Xiaofei , Lao Bangzhuang , Li Yuanhao , Zhou Yanjun , Feng Qinghai , Qiao Guan
Published: October 2020

The coal storage yard of thermal power plants are exposed to the air, causing problems like polluting the environment, falling short of requirements of eco-protection and undermining safe production. It causes threats in three forms:coal dust, coal pile explosion, and coal pile spontaneous combustion. Wind and dust suppression walls, dry coal sheds, fully enclosed coal sheds and other measures can be used in these yards to prevent pollution in the yard. Pollution treatment in these yards can avoid static dusting of coal and reduce the spread of dynamic dusting. This study interpreted the necessity of environmental treatment of coal storage yards and the development of three main technologies, and conducted detailed analysis and discussion of various environmental treatment solutions for coal storage yards of thermal power plants. This study intends to provide experience and lessons for environmental treatment of coal storage yards.
Research on temperature and humidity decoupling control of clean air conditioning system
Authors: Huang Cuicui , Zhao Yulei
Published: October 2020

In the clean air conditioning system, in order to ensure that the temperature and humidity in the room are within the allowable accuracy range, it is necessary to control the dew point temperature. However, due to the inconsistency of the temperature and humidity control systems, the delay and inertia time constant of each channel are very different, so the dew point temperature is difficult to control. In order to achieve accurate control, multiple valves are opened at the same time in the system, which leads to energy loss, and usually a single circuit works normally. But when multiple chains work at the same time, the system is not easy to be stable. Therefore, in order to ensure the long-term safe operation of multi-parameter control system, making full use of mature technology and single variable control experience is an effective method to manage multi-parameter system.
Review on landfill leachate treatment methods
Authors: Anqi Tu , Zhang Zhiyong , Suhua Hao , Xia Li
Published: October 2020

In most countries, sanitary landfill is the most commonly used method to eliminate municipal and industrial solid waste, but landfill produces seriously polluted landfill leachate. Landfill leachate contains many kinds of pollutants: such as refractory organic compounds and heavy metals. In general, there are three methods to treat landfill leachate: leachate transfer, biological processes, chemical and physical methods and membrane processes. Membrane processes can be divided into four types: microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO). Membrane process has the advantages of stable effluent and high rejection rate for refractory organic matter. But high treatment cost and membrane fouling problem affect the applications of membrane in practice.
Analysis of water leakage of generator stator bar
Authors: Yang Tian , Zhang Ping
Published: October 2020

In modern society, the demand of power generation is gradually increasing. As the main equipment of power plant, the stability of its operation is very important. There may be some defects in the materials and manufacturing process of the domestic water-hydrogen-hydrogen generator, which may cause water leakage of generator stator bars and generator failure. This may threaten to the stability of power system. This paper analyzes the leakage accident of generator stator bars in recent years and puts forward some solutions and precautions.
Study on the blasting vibration test of an open pit mine
Authors: Ma Yutao , Shi Xiaopeng , Jin Kaiming
Published: October 2020

Blasting vibration is one of the important factors affecting the stability of open-pit slope. It is necessary to evaluate and analyze its harmful effect and the influence on slope stability. Blasting vibration monitoring is an effective technical means. Through the fitting analysis of enough data obtained from key location monitoring, the site coefficient K value and attenuation index α value of the monitoring range were regressed to obtain the blasting vibration attenuation law, which provided the test basis for reducing or controlling the harm of blasting vibration, and provided the basis for blasting design to promote mine safety in production.
Research on Testing Technology of Gunshot Residues on Textile by Infrared Spectroscopic Imaging
Authors: Miaomiao Zhang , Jian Zhang
Published: October 2020

The research work of infrared spectroscopic imaging technology in the field of forensic science is still in its infancy. In the process of exploring the detection of material evidence by infrared spectral imaging, we find that this technology is a new method to test the invisible material evidence by the naked eye. In this study, the modified infrared imaging spectrometer is used to collect the spectral image set of the tested textiles, and analyze the spectral image set. The results show that the infrared spectroscopic imaging technology can be used to detect the gunshot residues on textiles, and the infrared spectroscopic imaging technology can be used for the qualitative analysis and inspection of gunshot residues on textiles
Effect of mental oxide on the structure and property of rare earth doped glass
Authors: Yue Yang , Wang Yanxiang
Published: October 2020

Glass fiber reinforced concrete (GFRC) is a very widely used material. However, the highly alkaline environment in concrete will erode and destroy the glass fiber therein, so it is particularly important to improve the corrosion resistance of glass. In this study, ZrO2 and TiO2 were introduced into the La2O3-CaO-Al2O3-P2O5 system glass and their effects on the structure and properties of the glass were systematically studied. The results show that the introduction of ZrO2 and TiO2 has a similar effect on rare earth doped glass. For one thing, it will increase the density of the glass and make the structure of the glass dense. For another, it can improve the water resistance and alkali corrosion resistance of the glass. SEM images showed that after the glass was immersed in the alkali solution, a protective CaO film was formed on the surface of the glass sample. As the etching time increases, the protective film on the glass surface peels off in a sheet shape, and the skeleton of the glass peels off in a lump shape.
The characteristics and developmental control factors of microscopic pore structure in shale gas reservoirs in the Lower Cambrian Qiongzhusi Formation
Authors: Yang Wei , Qin Yuanyuan , Zhang Tingshan
Published: October 2020

The Early Cambrian Qiongzhusi Formation on the southern margin of the Sichuan Basin (Southern China) has experienced a long geological process. High degree of thermal evolution of the organic matter shows a great impact on the organic evolution, reservoir microscopic pore types and structure characteristics in this formation. In this study, we investigate the major types and structural features of microscopic pores in shale gas reservoirs of the Qiongzhusi FM. Different types of matrix pores are found, over-mature shale gas reservoirs in the Qiongzhusi FM. mainly have well-developed micropores, but their average specific surface area (SSA) and pore volume are smaller than those in the Longmaxi Formation. The degree of thermal evolution poses the greatest impact on microscopic pore structure, which is significantly positively correlated with SSA and pore volume; however, when exceeding this range, SSA and pore volume both drastically decrease with increasing degree of thermal evolution. Compared with those in the Longmaxi FM., microscopic pores of shale gas reservoirs in the Qiongzhusi FM. feature pore- SSA and large surface porosity. The better the development of micropores, the larger the SSA and Vp of shales, which are more conducive to shale gas adsorption and accumulation.
Synthesis of carbon dots and their application in biomedical research
Authors: Ma Yefei , sun Shuhao , He Wen , Fu Xiaofen , Gao Xing
Published: October 2020

Carbon dots (CDs) are novel carbon-based zero-dimensional nanomaterials. compared with conventional semiconductor quantum dots, carbon dots have the advantages of stable fluorescence characteristics, good biocompatibility, low toxicity and easy functionalization improvement. Based on this, the synthesis methods of carbon dots and new strategies in synthesis are introduced. then, the excellent fluorescence properties and unique antibacterial efficacy of carbon dots were studied. Combined with the latest clinical medical advances, the potential value of carbon dots in bioimaging, guiding tumor metastasis, postoperative anti-inflammatory and other fields was summarized.
Analysis on heat transfer calculation of cylinder wall
Authors: Wang Yaron , Wang Peirong
Published: October 2020

Through long-term production practice and theoretical research, the basic law of heat transfer process is summarized. In the process of stable heat transfer, the heat transfer is directly proportional to the temperature difference between cold and hot fluids and is proportional to the heat transfer area. The heat transfer is also directly proportional to the heat transfer process’s intensity, that is, the heat transfer coefficient. According to the shape of the partition wall, the heat transfer calculation can be divided into flat wall heat transfer and cylinder wall heat transfer. The heat transfer calculation of cylinder wall is complex, and different calculation standards will get different results.
Effect of CNTs on Mechanical and Abrasion Properties of NBR
Authors: Yuan Song , Wen Jun , Zhang Qiong
Published: October 2020

Mechanical properties, abrasion properties and morphology of CNTs/NBR were studied in this paper. The addition of carbon nanotubes can effectively improve the aging and wear resistance of rubber composites. SEM demonstrated that agglomeration phenomenon occurs when the content reaches 4phr.
Study of Hyrothermally RDF Samples for Energy Applications: Thermogravimetric Analysis
Authors: Mehdi Miqdad , Hamid Siddiqi Muhammad , Xiaomin Liu , Qureshi Tayyab
Published: October 2020

It has become the need of our society to use municipal solid waste (MSW) under the vision of waste-to-energy (WTE) strategy in order to utilise MSW and to address the energy issues over the world. With respect to the energy, refused derived fuel (RDF) is the energy source of MSW, whose reliability and quality is analysed in this work. The energy content and combustion characteristics of RDFs in oxygen-enriched environment are explored. Three different RDFs (RDF-A, RDF-B and RDF-C) had been adopted from three different waste materials. Plastics, wood and cloth are the major constituents in the recipe of taken RDFs. Proximate and ultimate analysis, thermo gravimetric analysis and calorific value tests had been performed for all RDF samples. The results showed that the RDF-A contains high amount of carbon (52.44%) and hydrogen (4.184%) content and good calorific value (5278 k.cal/kg), which leads to a better fuel quality. TGA analysis revealed that with the increase in the volatile matter fraction of RDFs, the retention time under combustion atmosphere has also been increased accordingly. By analysing of all results, RDF-A was suggested to be the best for energy applications and can be used as fuel for various combustion reactions.
Synthesis of a deep eutectic solvent triethylamine/salicylic acid and its use for extractive denitrogenation
Authors: Shu Chenhua , Wen Yangping , Fang Hansun , Huang Huajun , Li Wenting
Published: October 2020

In this study, a novel deep eutectic solvent (DES) triethylamine/salicylic acid was synthesized and was used for the extractive denitrogenation of model oil. The structure of the DES was analyzed by fourier transform infrared spectrometry and the factors that influence nitrogen removal efficiency were investigated. Under the conditons of 20 min time, 30 °C temperature, 800 rpm stirring speed, 1:1 mass ratio of DES to oil, nitrogen removal efficiency reached more than 95%. After two extraction stages the nitrogen content of model oil could be reduced to less than 10 ppm. Therefore, the novel DES triethylamine/salicylic acid will became a promising extractant for fuel oil denitrogenation.
Flocculation of mineral processing wastewater with Polyacrylamide
Authors: Peng Yunyan , Jin Dong , Li Jingmiao , Wang Chunfeng
Published: October 2020

A lot of waste water and tailings were produced during mineral processing. Polyacrylamide, as an organic polymer flocculant, was widely used in the flocculation treatment of mineral processing wastewater and tailings. In this paper, the types of polyacrylamide commonly used in flocculation of wastewater generated from the beneficiation of metal ore, oil sand and phosphate ore were summarized.
Application of Foamed Soil in Widening Project of Limited Expressway Subgrade
Authors: Sheng Jing-liang , Yu De-yi , Zhou Tong , Zheng Yan-shuang
Published: October 2020

Lightweight foamed soil has the advantages of lightness, adjustable density and strength, low elastic shock absorption, good workability and environmental protection, and its mechanical properties can meet engineering needs, and it can effectively reduce the uneven settlement of the widened roadbed. Combined with the reconstruction and expansion project of an expressway, this article introduces the settlement monitoring and horizontal displacement monitoring of lightweight foamed embankment on-site, which provides a new way for the highway subgrade widening project.
Reliability analysis of RC beam bridge considering relevant random variables
Authors: Ye Pei
Published: October 2020

In order to test the analysis of the influence of non-normally related random variables on the reliability of RC bridge structures, the conversion process and method of Rosenblatt transform to non-normal random variables are systematically introduced. First, the basic principles and applicable conditions of Rosenblatt transformation are introduced. On this basis, based on the standard design expression and the design live dead load ratio as the basic parameter, the reliable index corresponding to different correlation coefficients is calculated according to the Rosenblatt transformation method. The results show that when the FORM method is used for calculation, the reliability index of Rosenblatt transformation calculation is greatly affected by the order of different variables; the structural reliability index of the RC bridge with relevant random variables increases with the increase of the correlation coefficient, and different live dead load ratios also have a more obvious effect on the reliability index; the shear bearing capacity is larger than the calculation result of the reliable index of the bending capacity, which does not meet the actual requirements. It provides a basis for the RC beam bridge to choose the bending capacity as the reliability of the resistance calculation.
Study on the spontaneous combustion risk and thermal decomposition characteristics of nitrocellulose
Authors: Liu Changhao , Zhu Shunbing , Wu Jiameng , Tao Lujia , Wang Wenhao
Published: October 2020

Nitrocellulose (NC) is an important raw material for industrial products and is widely used in military and civilian industries. However, accidents of nitrocellulose burning and explosion are common. In order to test the thermal hazards of NC and guide its safe production, storage, transportation and use, an auto-ignition temperature tester was used to study the effects of different factors (quality, heating rate, nitrogen content) on NC spontaneous combustion. And differential scanning Calorimetric method was used to test the heat flow curve of nitrocellulose at a heating rate of 5 °C/min after adding different content of diphenylamine (DPA) to determine the thermal kinetic characteristics of the initial reaction exotherm temperature, maximum peak temperature, reaction enthalpy change, etc. The results show that after adding 1%, 2%, and 3% DPA, the ΔT of NC increases sequentially by 4, 3.12, and 3.10°. DPA as a stabilizer has good compatibility with NC, which can effectively slow down the thermal decomposition speed of NC and prolong the storage life of NC.
Effect of the combined addition of TaC and NbC on the dispersity of cubic phase in ultra-fine WC–10Co–0.5Cr cemented carbides
Authors: Li Na , Zhang Weibin , Zhou Peng , Lv Jian , Du Yong
Published: October 2020

TaC and NbC have different effects on the dispersity of precipitated cubic phase, which acts as an important role in regulating the mechanical properties of ultra-fine cemented carbides. In this work, the influence of the combined addition of TaC and NbC on the microstructure evolution and mechanical properties in ultra-fine WC–10Co–0.5Cr cemented carbides was systematically investigated through the thermodynamic calculations and experiments. With the guide of thermodynamic calculations, the ultra-fine WC–10Co–0.5Cr cemented carbides with the combined addition of TaC and NbC were prepared. By replacing TaC with NbC, the dispersity of cubic carbides can be improved significantly from large-size honeycombed to small-size isolated cubic particles, which is explained by thermodynamic calculations. The brittle cubic phase results in the degradation of crack propagation resistance, and thus deteriorates the mechanical properties. Therefore, both the hardness and fracture toughness increase with the improvement of dispersity of cubic phase in cemented carbides.
Stable thermal transport in reduced graphene-oxide aerogel at elevated temperatures
Authors: Mahakul Prakash C , Gayathri P , Remyamol T , Sreemoolanadhan H , Ajith M R , Jaiswal Manu
Published: October 2020

We investigate thermal transport in three-dimensional graphene aerogel networks at elevated temperatures. The aerogels are solution-processed from graphene-oxide flakes using amine-based linkers and then partially reduced to impart stability in the chemical structure at elevated temperatures. Thermal conductivity of the system is estimated using steady-state electrothermal technique in vacuum in the temperature interval from 30 to 200 °C. The thermal conductivity value is κ ∼ 0.2 W/mK at room temperature, and is found to be weakly dependent on temperature across the entire temperature interval. To examine the microscopic origin of this stable response, the thermal conductivity estimates are complemented with insights from temperature-dependent transient electrothermal response. We show that the temperature stable thermal insulation behaviour observed in this system can be attributed to two factors: point-defect scattering at the flake level from the remnant oxygen-functionalities which dominates over Umklapp scattering processes, and another contribution that arises from interfacial thermal resistance between flakes. The partial reduction thus achieves a delicate balance between imparting chemical stability while also retaining the dominance of point-defect phonon scattering, where the latter contributes to temperature stable thermal conductivity.
The effect of S/Mo ratio on structure and properties of MoSx-Ti composite coatings deposited by magnetron sputtering
Authors: Wang Tao , Xue Chen , Yu Shouming , Chen Wei , Zhang Guojun
Published: October 2020

MoSx-Ti composite coatings with different S/Mo ratios were prepared by varying the substrate bias voltage of magnetron sputtering. It was found that the S/Mo ratio of the as-deposited MoSx-Ti coating decreased gradually from 1.7 to 1.3 as substrate bias voltage increased from −30 V to −110 V. The MoS1.7-Ti coating exhibits a nanocrystalline and amorphous phase mixed structure while the other MoSx-Ti coatings were all amorphous structured. The hardness of the MoSx-Ti coatings increased from 8.8 GPa to 9.8 GPa as the S/Mo ratio decreased from 1.7 to 1.3. The MoSx-Ti coatings with the S/Mo above 1.4 exhibit COF with values smaller than 0.07 at RH of 50% and increased wear rate in the magnitude of ∼10–7 mm3 Nm−1. The tribological behavior of the MoSx-Ti coatings were determined by the formation of the imperfect crystalline MoS2 tribofilm. With the decrease of the S/Mo ratio, the increased defects in imperfect crystalline MoS2 tribofilm lead to quicker consumption of the tribofilm during the trio-test, which result in a higher wear rate.