bluuebunny/crossref_metadata_2025_split huggingface dataset:
Locating the inflection point of frequency-dependent velocity dispersion by acoustic relaxation to identify gas mixtures
Authors: Zhang Xiangqun , Wang Shu , Zhu Ming 
Published: May 2020

Abstract
Measuring adiabatic sound speed is an effective method to characterize gases with different molecular weights because sound speed mainly depends on molecular weight at a given temperature. However, it is still a challenge to apply this method to different gas mixtures with similar or even the same sound speeds. Acoustic relaxation in gases may overcome this challenge because sound speed becomes dispersive due to frequency-dependent heat capacity. Based on our previous work on reconstructing acoustic velocity dispersion with a simple measurement method, in this paper, we propose capturing the inflection point of velocity dispersion to identify gas mixtures. Standard detection areas are constructed using the theoretical location of the inflection point scaled by the acoustic velocity and relaxation frequency with different temperatures for target gases. The captured inflection point is located in the detection areas to obtain gas compositions. Thus, gas mixtures with the same molecular weights, such as 86.9% CO2–13.1% N2, 95% CO2–5% H2 and 95% CO2–5% pH2, can be differentiated using our method from only their acoustic velocities. The results show that the maximum absolute error of the compositions for CO2 can be effectively reduced from 3.8% to 0.2% by our temperature correction function. Therefore, the proposed method can identify gas mixtures qualitatively and quantitatively by only measuring acoustic velocity.
Monitoring of bending stiffness of BFRP reinforced concrete beams using piezoceramic transducer enabled active sensing
Authors: Zhou Lingzhu , Zheng Yu , Huo Linsheng , Ye Yuxiao , Chen Dongdong , Ma Hongwei , Song Gangbing 
Published: May 2020

Abstract
Corrosion of steel bars leads to significant structural deteriorations in reinforced concrete structures, increasing their maintenance costs and shortening their service life. Fiber Reinforced Polymer (FRP) bars, as an internal reinforcing material instead of steel bars, are used in concrete structures owing to its high tensile strength and corrosion resistance. However, the structures of FRP reinforced concrete bending components have the large deflection and the lower post-cracking bending stiffness. In addition, it is difficult to evaluate the bending stiffness of in service FRP reinforced concrete beam by using the traditional monitoring method. This paper proposes a novel approach to real-time monitoring of the bending stiffness of FRP reinforced concrete beams using piezoceramic transducers enabled stress wave propagation. In this approach, several piezoceramic smart aggregate (SA) transducers are bonded on the side-surface of a concrete beam reinforced with Basalt-FRP (BFRP) bars to evaluate the bending stiffness based on stress wave propagation. A piezoceramic SA transducers based bending stiffness index (Piezo-BSI) is proposed to quantify the bending stiffness levels of BFRP reinforced concrete beams. The results show that the bending stiffness of BFRP reinforced concrete beams can be effectively evaluated by using SA transducers. The proposed Piezo-BSI values agree well with the actual bending stiffness index. This indicates that the Piezo-BSI values can accurately quantify and effectively reflect the actual bending stiffness levels of concrete beams reinforced with BFRP bars.
Integrated energy-water-land nexus planning to guide national policy: an example from Uruguay
Authors: Khan Zarrar , Wild Thomas B , Silva Carrazzone Maria Eugenia , Gaudioso Rossana , Mascari María Pía , Bianchi Fabiana , Weinstein Federico , Pérez Federico , Pérez William , Miralles-Wilhelm Fernando , Clarke Leon , Hejazi Mohamad , Vernon Chris R , Kyle Page , Edmonds Jae , Muñoz Castillo Raul 
Published: May 2020

Abstract
Despite broad consensus on the benefits of a nexus approach to multi-sector planning, actual implementation in government and other decision-making institutions is still rare. This study presents an approach to conducting integrated energy-water-land (EWL) planning, using Uruguay as an example. This stakeholder-driven study focuses on assessing the EWL nexus implications of actual planned policies aimed at strengthening three of Uruguay’s key exports (beef, soy, and rice), which account for more than 40% of total national export revenue. Five scenarios are analyzed in the study: a reference scenario, a climate impacts scenario, and three policy scenarios. The three policy scenarios include measures such as increasing the intensity of beef production while simultaneously decreasing emissions, increasing irrigated soybean production, and improving rice yields. This study supplements previous sector-specific planning efforts in Uruguay by conducting the first stakeholder-driven integrated multi-sector assessment of planned policies in Uruguay using a suite of integrated modeling tools. Key insights from the study are: as compared to a reference scenario, improving beef productivity could lead to cropland expansion (+30%) and significant indirect increases in water requirements (+20%); improving rice yields could lead to increases in total emissions (+3%), which may partially offset emissions reductions from other policies; expanding irrigated soy could have the least EWL impacts amongst the policies studied; and climate-driven changes could have significantly less impact on EWL systems as compared to human actions. The generalizable insights derived from this analysis are readily applicable to other countries facing similar multi-sector planning challenges. In particular, the study’s results reinforce the fact that policies often have multi-sector consequences, and thus policies can impact one another’s efficacy. Thus, policy design and implementation can benefit from coordination across sectors and decision-making institutions.
Study on water quality of tunnel type underground reservoir in island areas
Authors: Jin Qiannan , Yao Wenwei , Weng Yisong , Ji Yuyu 
Published: May 2020

Abstract
The water quality of tunnel type underground reservoirs was good generally, problems such as turbid water, weak pH, and excessive total colony problems are common. Some underground reservoirs were affected by water supplement sources, the water quality was uncertain and always with high concentrations of total nitrogen, nitrate nitrogen, manganese, zinc, etc. Therefore the water quality monitoring of water supplement sources and storage needs to be strengthened and appropriate follow-up water purification measures should be taken.
Research on multi-dimensional analysis model of drilling operations safety evaluation system
Authors: Lin Xu Ji , Kun Shen Jian , Liu Qin , Jie Tang Zhi , Yueqing Ju , Jian Li 
Published: May 2020

Abstract
Oil and gas drilling operation has the characteristics of large investment and high risk, so the effective identification and analysis of potential accidents is an important problem that needs to be solved urgently. In order to meet the requirements of complex analysis of drilling safety evaluation system, a multidimensional data analysis model based on data warehouse is constructed in view of the shortcomings of traditional database technology in information analysis ability, which transforms the application-oriented data structure into the analysis of multi-dimensional data structure, and provides a good environment and analysis method for drilling safety analysis and evaluation. According to the human, material, environmental and management factors of oil and gas drilling accidents, the relevant modelling topics were determined, and a multidimensional data model for analysing the potential accidents was constructed. This paper introduces the construction method of multidimensional data model with the theme of “analysis of potential accidents of drilling operation” as an example.
The Application of Constructed Wetlands in Ecological Construction of Coastal Industrial Agglomeration
Authors: Chen Yi , Shi Tingting 
Published: May 2020

Abstract
This paper takes constructed wetlands as the research object, analyses the position characteristics of land reclamation area where modern coastal industrial agglomerating in ecological pattern, points out that the lack of ecological buffer is a key problem that causes the negative ecological and environmental impact of industrial development on coastal areas. This paper expounds the importance of the sustainable development of coastal industrial agglomeration, puts forward that two key points of constructing the stable ecological pattern of land and sea are pollution reduction and ecological reconstruction; also points out that constructed wetland is of great value and significance in constructing ecological buffer in coastal industrial gathering area through analysing the important function of constructed wetland in pollution reduction and ecological reconstruction. Taking the typical constructed wetland project in China as a case, in the end of the paper, the effects of constructed wetland on marine ecological and environmental protection are further analysed.
Nutrition and Safety Evaluation of Hydroponic-cultured Pea SproutunderLead and Cadmium Stress
Authors: Yan Ling , Zhou Nan , Guo Xiangxin , Dong Qingyu , Gu Weishi , Wang Kailei , Zhou Qingwen , Ye Changqing , Yang Yuhuan 
Published: May 2020

Abstract
Heavy metals can bring health risks through the enrichment of crops and food chain, but there are few reports on their impact on the nutritional quality of crops. In this paper, the hydroponic-culturedpea seedlings under lead and cadmium stress were used to evaluate the heavy metal effects on growth, safety and nutrients variation. Lead has little effect on the sprout growth, and it mainly concentrates in the roots and seldom can be transferred to the edible parts. It would not bring health and safety hazards to the edible parts of stems and leaves but decrease the mineral nutrientsin peasprout slightly. Cadmium significantlyaffectboth growth and nutrition value of pea sprout, not only the root is abundant, but also the transfer rate of root and stem, which is about 13%. The nutrient content of Ca and Zn in stem and leaf is decreased significantly under cadmium stress.
Effects of reciprocal hybridization on the quality of Solanum photeinocarpum
Authors: Liao Renyan 
Published: May 2020

Abstract
In order to explore whether reciprocal hybridization can be used to cultivate new varieties of wild vegetable, the experiment used two ecological types (farmland ecotype and mine ecotype) of Solanum photeinocarpum as the experimental material of reciprocal hybridization, and compared the difference of qualities of F1 hybrids and parents. The results showed that the biomass, contents of vitamin C, soluble sugar, total acid, and soluble solids of leaves and stems of the F1 hybrid plants were not significantly different. But the indicators of F1 hybrid were higher than the parents. Among them, mining male × farmland female F1 hybrids has the highest leaf biomass, vitamin C content and soluble sugar content. The highest leaf biomass, vitamin C content and soluble sugar content were increased by 13.70%, 65.90% and 117.26% respectively, compared with the farmland ecotype, and increased by 14.40%, 48.89% and 54.99% respectively, compared with the mine ecotype. It indicated that reciprocal hybridization can effectively increase the biomass and the content of nutrients including vitamin C of F1 hybrids and reciprocal hybridization can be used to get new species of Solanum photeinocarpum.
Research on Fault Diagnosis and Prediction Method about Driving Motor for Seeding Metering of Plot Seeder Based on SVMs Classification and Regression
Authors: Hou Yuntao , Wu Zequan , Cai Xiaohua , Dong Zhongge 
Published: May 2020

Abstract
To solve the problem of fault diagnosis and prediction about driving motor (brushless DC motor) for seeding metering of plot seeder, the method based on SVMs classification(SVC) and regression(SVR) is proposed in this paper: firstly, the three-phase current signals of brushless DC motor(BLDCM) are analyzed to extract characteristic values of various samples; then the SVC model based on clustering combine SVMs dynamic pruned binary tree is constructed, and the SVR models about all and each class of training samples are all constructed, too. The first input sample is firstly predicted according to the SVR model about all training samples, then the predicted value is identified that belongs to a certain class of faults by the SVC model, and the next operation will be carried out according to the classification result. This method is verified in the fault diagnosis and prediction experiments of BLDCM, the diagnosis accuracy is 96.37% and the Root-Mean-Square Error is 0.217. It might be seen that the method presented in the paper is of validity.
Effects of 5-ALA on Fruit Quality of Blueberry Cultivated in Different Modes
Authors: Xiong Bo , Gong Yan , Yang Youting , Han Yan , Deng Lili , Tan Lin 
Published: May 2020

Abstract
This experiment used southern highbush blueberry as material to study the effects of different concentrations (0, 2000, 2500, 3000 times) of 5-ALA on fruit quality of blueberry grown in three different modes at fruit bearing period. The results showed that: (1) Rain-proof cultivation and greenhouse cultivation could significantly increase the yield of blueberry, but reduce the intrinsic fruit quality of blueberry; (2) The fruit quality of blueberry was affected by the interaction of cultivation mode and concentration of 5-ALA amino acid water-soluble fertilizer.
Effects of Different Concentrations of Methyl Jasmonate on Fruit Quality of Citrus Huangguogan
Authors: Dong Tiantian , Wang Bozhi , Zhang Huiyi , Wang Jiaqi , Yao Yuan , Xu Wenxin , Xiong Bo , Wang Zhihui 
Published: May 2020

Abstract
In this study, methyl jasmonate (MeJA) was sprayed on the fruits of Huangguogan in shimian county in two different ways (whole tree spraying and fruit spraying) to study the effect of MeJA on the postharvest quality of the fruits of Huangguogan. The consequence showed that, compared with check (CK), each treatment could improve the fruit quality, 10 μmol·L-1MeJAspayed on Huangguoganperformed best. It significantly increased the sugar content, Vc content, total soluble solid (TSS in short) content and the sugar acid ratio of the Huangguogan, meanwhile decreased the content of titratable acid. These consequences indicated that preharvest MeJA treatment could improve the fruit quality of Huangguogan.
Study on the Preservation Effect of Propolis on Sweet Cherry
Authors: Yang Youting , Gong Yan , Gao Yifei , Huang Jingyu , Xu Man , Xiong Bo 
Published: May 2020

Abstract
This experiment used ‘Hong Deng’ sweet cherry as material to study the effect of different concentrations (0.5%, 1.0%, 1.5%, 2.0%) of propolis extract on postharvest preservation of sweet cherry. The results showed that the propolis extract can effectively reduce the respiration rate of sweet cherry, reduce the weight loss rate, delay the decline of titratable acid, soluble solids and fruit hardness of sweet cherry, and slow the loss of fruit VitaminC. The 2.0% concentration of propolis extract has the best preservation effect.
Analysis of the flavor quality in 10 blueberry varieties
Authors: Huang Jinqiu , Zheng Shuyi , Li Henggang , Ao Qiaoman , Wang Xun 
Published: May 2020

Abstract
In order to screen out blueberries suitable for fresh food and processing, the contents of soluble sugar, titratable acid and ascorbic acid in 10 blueberry varieties were determined, and their flavor and nutritional value were analyzed. The results showed that the AsA content of ‘Jewel’, ‘Emerald’ and ‘Sweetheart’ is significantly higher than that of other varieties. ‘Britewell’, ‘O’Neal’ and ‘Sweetheart’ had higher soluble sugar content, but lower titratable acid content. ‘Biloxi’, ‘Jewel’, ‘Brigitta’ and ‘Pink Lemonade’ had lower soluble sugar content, and higher titratable acid content. In general, ‘Sweetheart’was suitable for both fresh food and processing.
The Nacala Corridor Railway and Port PPP project Risks identification research
Authors: Jesus Rock Elton De , Wu Shulian 
Published: May 2020

Abstract
Recently, Public Private Partnerships (PPP) in Mozambique has demonstrated significant advances in the level of private sector involvement in the delivery of infrastructure such as railways and port assets. It is generally considered that PPP is a mechanism to simplify the delivery of transportation projects, transfer the risks of transportation projects, reduce transportation costs and increase transportation revenue. This paper introduces a framework that identifies the risks associated with PPP arrangements for Railway and Port project delivery in Mozambique, with special attention to the Nacala corridor project. The framework divides risks into four categories: political, economic, socio-cultural, and technical (referred to as PEST), which can help project managers launch PPP projects to identify risks, manage risks, and minimize project risks.
A Marine Gravimeter Based On Precise Single-point Positioning Technology In Pacific Ocean
Authors: Xu Xiao , Wu Meiping , Cai Shaokun , Yu Ruihang , He Shaofei , Lu Qi 
Published: May 2020

AbstractMarine gravity measurement is one of the methods of marine geophysical measurement. The marine test used the SGA-WZ02 gravity meter independently developed by the National University of Defence Technology (NUDT), about 60 days of maritime tests were conducted in the Pacific Ocean from July to September 2019. The purpose of the test is to evaluate the feasibility of this gravimeter for marine gravity measurement and the accuracy of data processing using GNSS precision point positioning technology (PPP) in the later stage. The test area is located in a strait in the Pacific Ocean. The total area of the test area is about 2840km2 and the total distance is about 1074km. Among them, 7 repeat lines were measured, each distance was about 14.5km, and the ship speed was about 27.78km/h. In this paper, GNSS precision single-point positioning technology is used to evaluate the quality of the data of 7 repeated lines. After 100s low-pass filtering, the standard deviation of the accuracy within the SGA-WZ02 gravity meter is 0.56mGal, and the median error is 0.60mGal. The test results show that the SGA-WZ02 strapdown gravimeter can be used for the measurement of marine gravity field. The data processing algorithm based on precise single-point positioning technology meets the accuracy requirements of gravity measurement.
Study on flocculant for underwater non-dispersible concrete
Authors: Feng X R , Gao S , Zhang Y Q 
Published: May 2020

Abstract
A kind of flocculant for underwater non-dispersion concrete was prepared by mixing organic and inorganic components. The proportion of each component was determined by measuring the relevant performance index of mortar. And the verification test was carried out by concrete pouring. The results showed that the admixture meet the requirements of underwater non-dispersion concrete construction, and the main technical indexes meet the requirements of specifications.
Comparison analysis of four wind breaking designs for the hybrid cooling-tower-solar-chimney system under crosswind conditions
Authors: Zou Zheng , Liu Zhuang , Yan Wen , Cao Rupeng , Chen Wei 
Published: May 2020

Abstract
A hybrid cooling-tower-solar-chimney system (HCTSC for short) is a novel heat rejection device that dissipates waste heat for coupled thermal power plant and generates electricity simultaneously. Since the heat exchanger bundles are vertically placed at the periphery of the solar collector, this novel natural dry cooling system is relatively vulnerable to the crosswind. In order to enhance its performance under the crosswind conditions, four types of counter-wind designs were proposed and numerically compared. Comparison results showed that all four wind breaking designs were indeed helpful for the improvement of the power output under high intensity crosswind condition but it is at the cost of its heat dissipation performance.
CFD Modelling Based on MP-PIC of Low Rank Pulverized Coal Pyrolysis in Pyrolysis Furnace
Authors: Li Peng , Zou Chongen , Dong Fang , Shi Zhansheng , Ma Zhian 
Published: May 2020

Abstract
The multi-phase particle in cell (MP-PIC) method through defining the concept of ‘parcel of particles’ has been applied to study the simulation of gas-solid fluidized bed. In this paper, in order to reveal the pyrolysis behaviors with low-rank pulverized coal, the three-dimensional gas-solids flow, heat transfer and chemical reaction in a pilot-scale descending pyrolysis furnace was simulated by adopting the MP-PIC method coupled with a distributed activation energy model (DAEM) reaction model. First, the MP-PIC method was validated by comparing the experimental data and simulation results of the furnace temperature at four different pyrolysis reaction regions in a vertical square descending pyrolysis furnace with the throughput of 1.2 t/h, respectively. Then this MP-PIC method was further extended for analyzing the effects of handling capacity with the throughput of 1.2, 1.5, 2.0, 2.5, 3.0 t/h.
The Investigation Plasticizing Mechanism on Poly (vinyl alcohol)/Water/Caprolactam System and the Preparation of Raw PVA Fibers by Melt Spinning
Authors: Xu Yongjing , Wang Youfu , Zou Liming , Zhao Jiongxin , Li Wengang , Liu Guoping 
Published: May 2020

Abstract
A novel plasticizer system water/caprolactam (W/CPL) was applied in thermal processing of poly (vinyl alcohol) (PVA), water as the primary plasticizer and caprolactam as coplasticizer. The plasticizing mechanism of PVA/W/CPL system was investigated and the raw PVA fibers was prepared by melt spinning. The result showed that the melting temperature of PVA polymers decreased and the window of thermal processing has broaden due to W/CPL plasticizer. In addition, the raw melt-spun PVA fibers with circular structure and uniform structure had great potential application prospects in cement-based reinforcement.
The Solar Energy Promotion Policy of Technical Standard System in China
Authors: Zhou Bin 
Published: May 2020

Abstract
In this paper, a series of reasonable design and high-operability technical standards are put forward, which make solar energy as a practical application project can be understood or measured by a complex technical standard system, and provide support for the planning, management and decision-making of the industry. It will give better way to the guiding role of existing policies, standards and norms, and improve the level of solar energy applications in the mainland. In these plans, they summarize the latest research and technical progress of solar energy promotion standard. These studies can provide strong support for decision-making in solar energy application planning and management.
Application and analysis of short-hole rapid extraction technology in high gas long distance driving face
Authors: Xiang Zhencai , Wang Xiaopeng 
Published: May 2020

Abstract
Aiming at the poor coal seam permeability and rapid attenuation of bored gas flow in the Huoerxinhe Coal Mine in Shanxi, the high return gas concentration in the long-distance tunneling of the coal roadway affects the speed of the coal roadway, and it is proposed to use a short time for maintenance. The new ideas for rapid and centralized drainage of boreholes during heading are to extract small-scale gas in a short time and high intensity, reduce ventilation pressure, and increase the speed of coal roadway. The application of the 3605 return air circulation in the Huoerxinhe coal mine shows that the short-drilling fast extraction process is adopted in the maintenance class, and the monthly footage of the work face is increased by 50% on the premise that the return air flow and the gas concentration in the work face are reduced by 20%. Realize the effective treatment of the long-distance coal roadway driving face of low-permeability coal seam, and ensure the safe production of the working face.