bluuebunny/crossref_metadata_2025 huggingface dataset:
Species diversity and conservation status of marine ornamental fish traded at three market spots in the southern coast of West Java
Authors: Nuryanto A , Bhagawati D , Kusbiyanto
Published: May 2021

Several studies had reported marine ornamental fish are exported from Indonesia to the United States of America. However, there is no study about marine ornamental fish that has been done with particular reference to specific localities across Indonesia, mainly from the southern coast of West Java. This study aims to know species diversity and conservation status of marine ornamental fish traded in Pelabuhan Ratu, Ujung Genteng, and Taman Manalusu. Fish samples were bought from the first collector in each sampling locality. Fish species were identified morphologically according to the previous publication. A total of 93 nominal species, 22 families, and six marine ornamental fish orders were traded. The highest number of species belonged to Pomacentridae and followed by Achanturidae, Labridae, and Chaetodontidae. The remaining families consisted of one up to six species. Perciformes was the dominant order with 19 families. Most of the species are listed as Least Concern conservation status, and one species listed as vulnerable, namely Hippocampus kuda (sea horse). Our results proved that many marine ornamental fish were on the southern coast of West Java and mostly listed as Least Concern species.
Distribution and accumulation of heavy metals from waters and sediments to Scylla serrata in Segara Anakan, Cilacap
Authors: Sastranegara M H , Lestari W , Sudiana E , Oedjijono  , Nasution E K
Published: May 2021

Some heavy metals of Cd, Cu, Pb, and Hg polluted in Segara Anakan Cilacap, but no information on a specific heavy metal pollution in this area and an edible mud crab of Scylla serrata. The research aimed to know their distribution in this area and their accumulation of heavy metals from waters and sediments to Scylla serrata. The study was done using a survey method with purposive random sampling at six stations from Station SA-2-28 and SA-3-46 (with a high percentage mangrove canopy cover) to Station SA-2-24, SA-3-35, SA-1-10, and SA-3-16 (with a low percentage mangrove canopy cover). Three replications were done in the dry season conditions from July to September. The researcher took all samples with the water sampler tool, sediment core, and baited trap for sampling. Then, they were analyzed using Atomic Absorption Spectrophotometry (AAS) method. The result showed that the lowest heavy metals were at Station SA-2-28 and SA-3-46 and followed by Station SA-2-24, SA-3-5, SA-1-10, and SA-3-16 due to the high percentage of mangrove canopy cover, while the reserve order was due to the increased pollution in east side areas of Segara Anakan Cilacap. The heavy metal accumulation of Cd, Cu, Pb, and Hg has occurred from waters and sediments to Scylla serrata.
Degradation of phenol in batik industry wastewater using thin layer TiO2photocatalyst
Authors: Riyani K , Setyaningtyas T , Riapanitra A
Published: May 2021

The synthesis of thin layer TiO2photocatalyst has been performed and its performance was tested to the degradation of phenol in wastewater of batik industry. The powder of anatase TiO2 was impregnated in glass plate, so that thin layer TiO2photocatalyst was obtained. The performance test of thin-layer TiO2photocatalyst in the degradation of phenol was performed in a batch photoreactor equipped with six types of black light UV lamp (@10 watts) and a magnetic stirrer. This research has been performed at pH variation and UV radiation time. The result of this research showed that the initial concentration of phenol in batik wastewater was 3,3684 ppm. The optimum pH was obtained at pH 11 with percent degradation of 40.41%. The optimum UV radiation was obtained at 8 hours with percent degradation of 41.72%. The longer the irradiation time the more photon energy is absorbed by TiO2causes more positive holes to be formed. The positive holes will react with H2O or hydroxyl ions to form OH radicals that further break down organic compounds in waste.
Hardware-based microgrid testbed to facilitate development of Distributed Energy Resource (DER) systems for sustainable growth
Authors: Idowu Peter B. , Suryadevara Raja
Published: May 2021

Distributed energy resource (DER) systems that can combine small-scale conventional energy sources with diverse renewable energy options and storage are ideal for addressing electrification needs of small communities, as well as proactively mitigating negative impacts of fossil energy sources on the environment. It is therefore imperative for academic institutions that wish to play a role in addressing energy challenges for sustainable rural development to be adequately equipped with a hardware testbed for the study and analysis of DER systems. This work features a 45kW hardware testbed installation at Penn State Harrisburg, highlighting its design, construction, and its uses in academic instruction and research. A case study on electric loading characteristics of the network is presented to illustrate its relevance and the potential for its use in preparing a skilled workforce for a new energy economy.
Study on hydraulic transient process of K hydropower station with low head, large flow and complex long tail water system
Authors: Gaohui Li , Mengjie Zhang , Xiangrong Chen , Quanchun Zheng , Weijie Cui , Lei Jiang , Tianchi Zhou
Published: May 2021

K hydropower station is a hydraulic engineering with the main task of power generation, which is also a typical hydropower station with low head, large discharge and long tail water conveyance system. The hydraulic characteristics of these-type hydropower stations are of high water inertia, large amplitude of surge chamber water level fluctuation and poor stability of units. Therefore, due to the control requirements of the stability, the area of the horizontal section of the surge chamber is usually large, which leads to the long period of water level fluctuation of the surge chamber and the relatively long time of unit output oscillation in the transition process, and the regulating quality of the unit is often difficult to meet the control requirements due to the large inertia time constant of the water flow in the water conveyance system and the unique characteristic curve of unit. It is important to design appropriately to ensure the safe and stable operation of the hydropower station. In this paper, it is shown the process of hydraulic design of these-type stations. According to the design of K hydropower station, the simple surge chamber and restricted orifice surge chamber are compared in terms of hydraulic characteristics including the head loss of steady operation, the water level fluctuation of transition process and the stability of operation. Based on the optimized restricted orifice surge chamber, the overall calculation and analysis of the hydraulic transition process and the stability analysis of K hydropower station are carried out, it is concluded that the unit stability quality of the K power station is fine and the maximum pressure of pipe is in control, which provide strong support for the safe and stable operation of K station. The comprehensive and thorough analysis in this paper can provide reference for the design of the similar projects.
Engineering application of power generation technology for adding and reducing silt in multi-sediment reservoir
Authors: Zhou Heng , Li Yongqing , Xing Ruijiao , Di Shengjie , Lu Xi , Sun Haitao
Published: May 2021

The uncoordinated relationship between water and sand is a major technical problem that has not been completely eradicated or resolved in the construction of water conservancy and hydropower in the world. In response to the problem of sedimentation, scientific research, design and operation units have carried out research and application of key technologies for the addition of sediment-laden reservoirs to reduce siltation and power generation. The research results have been successfully applied to the Liujiaxia Tao River Mouth Desilting Tunnel and Machine Expansion Project. The Liujiaxia Reservoir has successfully solved the sediment discharge and silt reduction, increased the effective storage capacity of the reservoir, improved the power generation efficiency of the reservoir, improved the water quality of the reservoir, and provided support for the long-term spatial deployment of water resources.
Study on the reinforcement effect of bolt in the artificial dam of underground reservoir in Wulanmulun mine
Authors: Shan Ren-liang , Liu Shuai , Kong Xiang-song , Liang Chen
Published: May 2021

With the exploitation of a large number of coal resources in Western China, the phenomenon of local water shortage has become increasingly prominent. In order to protect water resources, coal mine underground reservoir came into being. In the underground reservoir of coal mine, the stability of artificial dam is often the key to the water storage. In order to enhance its stability, steel structure is often arranged inside the artificial dam and connected with the bolt arranged in the cut, so that the artificial dam and the surrounding rock form a whole and play the role of water storage and blocking together. However, the effect of this reinforcement structure still needs to be further studied. Therefore, this paper takes Wulanmulun mine as the engineering background, mainly uses FLAC3D numerical simulation software to analyze the effect of reinforcement structure, and finds out the relatively reasonable bolt size. The results show that: the artificial dam and surrounding rock are more stable and safe under the reinforcement of bolt, increasing the size of bolt will reduce the displacement and plastic zone range of cut in the side, especially increasing the size of bolt at the top and bottom will have better effect.
Dynamic Analysis of a Tripod Offshore Wind Turbine under Earthquakes
Authors: Luo Chengxi , Liu Yingzhou , Zuo Jingjing , Wang Wenhua
Published: May 2021

Earthquakes are non-negligible hazards for the designing of offshore wind farms in the coastal regions of China, such as Bohai Bay. So, it is necessary to analyze the response of offshore wind turbines (OWTs) under earthquakes. Fluid mechanics are applied to the model, the interactions of sea water and the substructure are based on fluid theory analysis in this paper. Moreover, it takes into account of the influence of fluid-solid coupling effect, radiation effect of wave loads and pile-soil interactions on the OWT. By establishing the finite element model (FEM) and dynamic equation of a tripod OWT, the measured onshore and offshore seismic waves are applied in the finite element analysis of the Tripod OWT respectively, and the numerical analysis of a tripod OWT structure under different measured seismic waves is carried out. More detailed comparison of the differences between onshore and offshore seismic waves is carried out in the paper. The result shows that the offshore seismic waves stimulate more significant responses than the onshore one, which can be attributed to that abundant seismic frequencies are found around the fundamental frequencies of the OWT. the seismic response analysis is conservative by using the onshore seismic waves, however, using the offshore seismic waves is closer to the actual situation.
Catalytic Effects of Red Mud and Acidithiobacillus ferrooxidans on Biodissolution of Pyrite
Authors: Lin Mo , Yang Baojun , Lin Hao , Liu Shitong , Wang Jun
Published: May 2021

The catalytic effect of red mud on biodissolution of pyrite was studied with Acidithiobacillus ferrooxidans in this study. Dissolution and results showed that red mud could significantly promote pyrite biodissolution. The bacterial group with 4g/L red mud had best dissolution effect. The iron extraction rate in the group was 47.9% higher than the control group. Red mud in sterile group could inhibit pyrite dissolution. The iron extraction rate in the group with 8.0g/L red mud was 75.4% lower than the control group. The biodissolution results indicated that red mud could accelerate pyrite dissolution by promoting electron transfer in biodissolution system and enhancing the growth of A. ferrooxidans.
Accumulation characteristics of tight sandstone gas reservoirs in the Upper Paleozoic in the Shenfu block of the Ordos Basin
Authors: Jiang Lei , Zhou Ronghai , Li Gang
Published: May 2021

The Shenfu gas field on the eastern margin of the Ordos Basin is one of the key blocks of CNOOC’s land tight sandstone gas field development in recent years. In order to further analyze the physical properties and accumulation and evolution characteristics of the Upper Paleozoic tight sandstone gas reservoirs in the Shenfu block, we characterized of the reservoir pore structure, diagenetic evolution, and natural gas accumulation stages, combined with fluid inclusions, the types of tight sandstone gas reservoirs in the Upper Paleozoic are studied, revealing the main controlling factors for the natural gas accumulation in the study area. Studies have shown that the core porosity of tight sandstone reservoirs in the Upper Paleozoic in the Shenfu block is less than 10%, and the permeability is less than 1mD. Compaction and cementation are the main factors for reservoir tightness. The results of porosity evolution and homogenization temperature of fluid inclusions indicate that the Upper Paleozoic sandstone tightness is formed during the Middle-Late Triassic-Early Jurassic, which is earlier than the Late Jurassic-Early Cretaceous period of large-scale natural gas accumulation.
Research on the Application of Geological Forecast in Coal Mine Safety Production
Authors: Wang ZHonghua
Published: May 2021

In order to realize coal mine safety production, it is analyzed the importance of geological forecasting in coal mine safety production from three aspects: the close relationship between geological forecast and safety production, the guiding significance, and the occurrence of accidents. It applied successfully to three aspects:geological forecasting to fault prediction, outburst disaster prevention, and mining plan design. It is of great significance to the safe production of Shangzhuang Coal Mine.
Research on Gas Treatment Technology in The Work Surface of Dasher Coal Mine
Authors: Renjun Feng
Published: May 2021

Based on the principle of gas formation on the coal mining work surface, the article analyzes the main source of gas in the mining area of Dashe coal mine, finds out all kinds of problems existing in the pumping of the upper angle intring tube, and summarizes the real reasons for the backwind of the work surface and the gas exceeding the limit of the upper angle. In view of these reasons, combined with the principle of the formation of the upper angle gas, the mine on the upper angle intring process construction of the intring depth, height and interception area of the investigation, to obtain the best pumping value under different conditions, and according to the results of the inspection in the 21704 work surface test and transformation, and achieved a better pumping effect; According to the test results, the field effectively controls the work surface and the upper angle gas exceeding the limit, ensures the safe production of the work surface and the mine, and provides reference and reference for the treatment of the angle gas on the work surface under the same type of condition.
Disaster mechanism of Donghekou landslide in the Ms8.0 Wenchuan earthquake
Authors: Li Baolai , Zhang Hanliang , Ren Fengwen , Li Chunfeng
Published: May 2021

During the “512” Wenchuan earthquake, Donghekou, which is located at the end of the seismogenic structure, experienced serious collapse and slide, resulting in serious disasters. In this paper, based on the analysis of near-fault strong ground motion records of Wenchuan earthquake, the collection of seismogenic structural data and near-fault structural damage data, the disaster mechanism of Donghekou landslide is studied. The earthquake damage of Donghekou was caused by pulse-like ground motion and the surface rupture along the seismogenic structure. The surface rupture at the far end of Donghekou participated in the formation of the pulse-like ground motion.
Study on the Sedimentation of Power Branch Tunnel under Turbid Water Test
Authors: Zhou Heng , Fu Tingqin , Di Shengjie , Huang Peng , Sun Haitao
Published: May 2021

Combined with the actual project of a hydropower station, the turbid water test is used to verify the sedimentation of the power branch tunnel under the sand discharge conditions. The results show that under the sand discharge conditions, there are different degrees of siltation outside the recirculation zone of the power branch tunnels in the bifurcation section, and the siltation form is a delta siltation form. The sedimentation volume of the power branch tunnel is related to the sediment discharge flow in the sand discharge pipe. The greater the sediment tunnel flow, the greater the sedimentation in the cecum section of the power branch tunnel when the siltation balances.
Study on Flow Conditions for Navigation in Entrance Area and Connection Reach Downstream of the Lock of a New Hub
Authors: Wang Fei , An Xiaoyu
Published: May 2021

The entrance area and approach channel downstream of the lock of a new hub are located on the concave bank of a narrow river section with poor flow conditions for navigation. This paper studies their flow conditions for navigation at all levels of flow rate through the combination of the overall physical fixed bed model test and the remotely controlled self-propelled model ship, and finally puts forward a recommended scheme meeting the navigation requirement for reference in similar works by means of removal of the deflecting area downstream of the power station, dredging of the side shoal on the left bank and changes in the layout of the navigable wall.
Study on vibration law of complex foundation of terminal yard under dynamic consolidation
Authors: Yuan Fanglong , Wei Liuming
Published: May 2021

Hard shell layers with different thicknesses are usually distributed on the surface of terminal yard foundation, in order to ensure the safety of surrounding buildings and provide reasonable suggestions for dynamic compaction construction, it is urgent to study the vibration regularity of dynamic compaction. Based on the actual engineering project, this paper systematically studies the vibration law of hard shell foundation under different dynamic compaction construction parameters, it is concluded that: in the stage of hard shell breaking by column hammer, the peak value of vibration velocity is proportional to the thickness of hard shell layer, the peak vibration velocity decreases exponentially with the increase of distance, the minimum safe distance between the site and surrounding buildings is 37m to 58m; when the tamping energy is constant, the peak value of vibration velocity is inversely proportional to the diameter of hammer, on the premise of satisfying the reinforcement effect, large diameter hammer should be preferred; in the stage of flat hammer tamping foundation, the more tamping times, the greater the peak value of vibration velocity, and the amplitude of vibration velocity peak finally tends to be stable; in the stage of column hammer breaking hard shell layer, the peak value of vibration velocity decreases with the increase of tamping number, until the hard shell layer is damaged, the tamping energy is absorbed by the underlying soft clay layer, the peak value drops sharply.
Microzonation of ground motion parameters in Xianyang City
Authors: Li Baolai , Zhang Hanliang , Ren Fengwen , Li Chunfeng
Published: May 2021

In this paper, based on the study about the geology, seismology and conditions of site of seismic microzonation in Xianyang City, the microzonation of ground motion parameters in Xianyang City was finished, which can contribute to the aseismic fortification of the structure of in Xianyang.
Study on the Transformation Strategy of Chinese Classical Gardens in Urban Public Space: Take Anning Nanyuan as an Example
Authors: Chu Zijing , Zeng Tiancheng , Hu Liyan , Xie Jinfa , Gao Panyu
Published: May 2021

Currently, urban parks are booming, but many public gardens are out of touch with modern city life. It is necessary to find out the functional positioning of public gardens and carry out the transformation to conform to the development of urban life, so that it can play a unique value in the urban space where all kinds of modern landscapes are emerging. This paper takes Anning Nanyuan and its adjacent Baihua Park as examples to compare and analyze the characteristics of the internal crowd activities of the two, explore the similarities and differences between public classical gardens and modern parks as urban landscape spatial identities, and provide references for the scientific development of public classical gardens in the future.
Analysis and Improvement of Oblique Shear Phenomenon of Direct Shear Apparatus
Authors: Chao Teng , Zhijun Liu , Xuegang Wang , Liping He
Published: May 2021

Direct shear test is an important method to test the shear strength of soil. But the phenomenon of “oblique shear” often appears in the process of test, the soil sample subjected to eccentric pressure and uneven stress distribution, which affect the stability and accuracy of the test. This paper, starts from the construction of the direct shear apparatus, found that the relative displacement between the upper shear box and the axial pressure rod, is one important cause of “oblique shear”. Set the steel ring between the lower shear box and the push rod, dose not affect the shear force measurement and can completely fix the upper shear box. There is no relative displacement between the upper shear box and the rod used to apply axial pressure after improvement, and no the phenomenon of “oblique shear”. The experimental results are more stable and the coefficient of variation is smaller. The improvement scheme of the direct shear apparatus is simple, the improvement effect is obvious, and the stability and accuracy of the direct shear test are improved.
Force analysis and design of backfill retaining wall in large complex Goaf
Authors: Lu Hongbin , Yin Yu , Liu Yiming
Published: May 2021

The design of backfill retaining wall and construction technology are important factors that affect the cost, quality and safety of backfill. In order to reduce the cost, improve the quality and prevent the collapse of the Goaf, it calculates the total pressure and the maximum bending moment of the retaining wall with different filling height. Then it determines the filling height and the thickness of the retaining wall. Finally it studies the technical measures of dewatering, drainage and slurry running of backfill. The research shows that it should control the filling height within 1.5 m, the maximum thickness of backfill retaining wall should not be less than 3.8 m, it should connect the suspended dewatering pipe with the steel pipe embedded in the bottom of the retaining wall, and set up a drainage body to realize rapid dewatering and drainage, to reduce the pressure on the retaining wall.
Seismic analysis of concrete dam based on a simple damage model
Authors: Li Zheng
Published: May 2021

The present improved simple damage model is capable of capturing the unilateral effect and the more realistic softening curve of concrete by adopting different compressive and tensile evolution equations for concrete. And a user subroutine UMAT has been developed. Using the commercial code Abaqus, the analysis of seismic damage and response of the Koyna dam is performed. The results show the importance of considering the concrete damage in the seismic analysis of concrete dam.
An Research on Influencing Factors of Urban Land Use Efficiency Based on Tobit Model
Authors: Qiu Yingying , Song Hongling , Sheng Jia
Published: May 2021

The purpose of this research is to, by taking Wuhan city as an example, build Tobit model to calculate and analysis the influencing factors of urban land use efficiency so as to provide reference for improving urban land use efficiency. Methods employed include Tobit model. The results show that: 1)the significant factors influencing the land use efficiency of Wuhan city in 2014-2016 are urban per capita disposable income, urban fixed asset investment and urban population scale, 2) the influencing factors of urban land use efficiency and its influencing degree change dynamically at different time periods, and can be greatly influenced by land policy, 3)Tobit model can analyze the specific influencing factors of land use efficiency and the degree of influence from the quantitative point of view.
Analysis of constraints on data management of intelligent platform for smart building in the era of big data
Authors: Zhang Miyan , Lv Hui , Chen Huapeng , Hu Qingxia
Published: May 2021

With the rapid development of science and technology in China, data has become the core of various fields and industries. The construction industry is the first to bear the brunt. The merits and demerits of data management can directly determine whether smart buildings are worthy of the term “smart”. However, at present, the management level of most intelligent platform data of smart buildings is low, which cannot well adapt to and meet the development needs of smart buildings. Therefore, in view of the problems existing in the data management of the intelligent platform of the existing smart building in the era of big data, this paper conducts in-depth research and exploration, and points out the main restraining factors of the data management of the intelligent platform of the smart building. This paper expounds how to achieve more fine, safe and intelligent management of the data of intelligent platform of smart buildings in the era of big data.
Research on Key Technologies of big data analysis in smart irrigation area
Authors: Xuan Wang , Mimi Guo , Dengchang Ma
Published: May 2021

Several key data analysis technologies involved in irrigation area construction are discussed. A closed-loop large data management model for irrigation area is proposed, which includes data collection, data sharing, data management, data development and utilization. Five types of analysis, including statistical analysis, professional calculation, planning optimization, system simulation and intelligent algorithm, are compared, and an abnormal water intake behavior early warning, water supply and demand forecast, water-saving irrigation area evaluation and installation are constructed. Four typical application scenarios, such as intelligent research and judgment of abnormal operation, have certain reference value for promoting the construction of intelligent irrigation area.
Application of Big Data Technology in Water Conservancy Project Informatization Construction
Authors: Ni Xudong , Hou Xiaoyue
Published: May 2021

In order to better develop the cause of water conservancy project, improve the quality of water conservancy project construction, and bring more benefits to the public, this paper expounds the current situation of water conservancy project informatization construction in China through theoretical analysis, discusses the feasibility of big data in water conservancy project informatization construction, and points out the specific application of big data technology, so as to achieve the purpose of water conservancy project informatization construction.
The applied research on Tuned Liquid Damper in practical engineering with three-dimensional numerical simulation
Authors: Su Jizhi , Wu Hailiang , Zhang Wuchen , Liu Zhong , Wang Yamin , Cheng Nan
Published: May 2021

The practical application of high-position fire-fighting water tanks on the top-level of office buildings in State Grid Corporation of China is studied in this article. Fluid-solid-coupling mathematic models were established based on ABAQUS finite element analysis software to compare the calculational results in two-dimensional situations and three-dimensional ones. Meanwhile, a 22-storey frame-shear wall structure named Innovation Mansion was selected to discuss the vibration reduction effect of TLD. The results indicate that the fliud-solid-coupling analytical method could reflect the nonliear character of TLD-structure systerm precisely, and the aseismic ratios were 2%~5% variation between two-dimensional models and three-dimensional ones. The TLD has positive effects on controlling the structural seismic responses and the aseismic ratios could reach 10% around, besides, the TLD damping force not only offset the increased base-shear arose from its own weight, but also reduced the total base-shear.
Detection and Evaluation of the Bearing Capacity of Railway Steel Plate Girder Bridges
Authors: Liang Tengfei , Cheng Yingge
Published: May 2021

To ensure the safe operation of existing railway bridges, it is necessary to conduct comprehensive inspections of their bearing capacity and actual working conditions on a regular basis. In this paper, taking the 2# steel plate girder bridge on Qinglv Branch Heihe as an example, the appearance inspection, pier and abutment strength test, static load test and dynamic load test were carried out on this steel plate girder bridge, and the content and method of the comprehensive test of the steel plate girder bridge were explained; Based on the test results, the working condition of the bridge was evaluated, hoping to provide reference and reference for other similar bridge type inspection and reinforcement work.
Seismic analysis of multi-story frame office building based on SAP2000
Authors: Li Jiuyang , Li Fangqi , Cai Zhiru
Published: May 2021

Taking a multi-storey reinforced concrete frame structure office building as an example, the model analysis, response spectrum analysis and time history analysis of the whole structure are carried out by using the finite element software SAP2000, and the output results of y-pillar in different scenarios are analyzed. The results show that the overall seismic performance of the frame meets the design specifications, and the y-pillar structure meets the elastic and non yield characteristics of the large earthquake.
Resistance Deterioration Assessment of Concrete Beam Bridges based on Strain Monitoring Data
Authors: Wang Kangdi , Li Linguo
Published: May 2021

The bridge health monitoring system deployed in concrete beam bridge mostly uses strain sensors to collect data and evaluate the working state of bridges. However, the existing evaluation method of bridge working condition based on strain data cannot realize the evaluation of whole bridge bearing capacity. To solve this problem, this paper puts forwards a resistance deterioration assessment method based on strain monitoring data and calculated maximum crack height. Through the engineering project verification, this method has been deemed to be effective.
Research on Integrated Management Platform of Smart Park Based on CIM
Authors: Gao Zhanwang , Luan Wenjie , Lin Wenjie , Zhang Jiamin , Chang Runwu
Published: May 2021

At present, the construction of smart cities and smart parks in China has been widely concerned, and the intelligent decision-making in the process of urban planning, design, construction and management is in urgent need of refined, visualized, dynamic and integrated expression of urban entity information. Therefore, this paper studies a technical theory of digital description and expression of cities, namely CIM (City Information Model). Our team independently innovates, developing smart park management platforms. This platform is based on BIM (Building Information Model), GIS, IOT (Internet of Things) and other new generation information technologies. BIM mainly studies parametric information inside buildings, while GIS focuses on external spatial geographic information. IOT Internet of Things technology realizes the transmission and processing between information and data. This platform integrates and upgrades these technologies to build a smart park platform. This paper explores the presentation and current situation of CIM theory and technology under the background of smart city construction, smart park construction and operation and maintenance management.
Research and application of key technologies for dam safety monitoring based on LoRa
Authors: Xie Changjiang
Published: May 2021

Aiming at the problems of high power consumption, weak scalability and short wireless transmission distance of dam safety monitoring system, the key technology of dam safety monitoring based on Lora is proposed. An intelligent monitoring terminal is designed based on ARM LPC1788 and Lora wireless communication module. The low-power relay mode with Lora and 4G transmission function is adopted, and the active loop calling process and threshold trigger early warning process are designed. The platform software automatically receives data to realize the intelligent collection, analysis and early warning of dam multi factor safety data. The engineering application effect is good.
Research and Application of DC Multi-functional Information Pole
Authors: Wang Yaqian , Fan Zhonghua , Kong Yuhui , Yang Xinke , Yang Zhenhua
Published: May 2021

With the progress of electronic information technology and the development of smart cities, DC power supply and distribution technology and multi-functional information pole construction have received more and more attention. As the underlying perceptive carrier, the multi-function information pole is indispensable in the smart city construction. Combining multi-function information poles with DC technology is an innovative solution to the development trend of smart cities. This solution is designed by considering the requirements of electrical, communication and peripherals, we can further reduce power loss, improve reliability and safety by taking power from DC distribution network directly. The DC multi-functional information pole described above has been successfully connected to the DC distribution network of a compound in Huai’ an, Jiangsu Province. The demonstration application of DC power supply from multi-functional information pole at the terminal distribution network level has been realized.
Application of planning evaluation of historical block based on space syntax —— Case study: Third Streets and Two Alleys historical block, Nanning
Authors: Guo Kexin , Cao Yingxian
Published: May 2021

With the current acceleration of urbanization, the evaluation of spatial planning of historical blocks has become an emphasis in urban research. Reasonable spatial interpretation and planning evaluation deserve consideration. This study takes the historical block of the Three Streets and Two Alleys as an example, which is a key development strategy of Nanning city. With GIS spatial analysis method and improved spatial syntax (sDNA model) to construct the syntax model of the core area of the first phase of the third streets and two alleys. Through the analysis of time scale, integration degree, Choice and understandability, the first-phase planning of the block is evaluated on multiple scales. The result shows three conclusions: (1) As an advanced space syntax method (sDNA model) has significant advantages in large-scale in the evaluation of historical blocks. (2) On the whole, the planning evaluation of third streets and two alleys follows the “formal-traffic-function” principle. The integration degree, Choice and understandability have made a certain progress. (3) The correlation between spatial morphology and spatial function is verified by combining commercial data, it shown the space is a part of developing social and economic life. The research argues that, as an advanced special analysis method, sDNA model has a great application prospect.
Analysis on the Layout of Traditional Residential Courtyards and Building Structures in Guanzhong Area, Shaanxi——Taking Xiaojiapo Village in Lantian County as an example
Authors: Yanjun Li , Mengchen Lian
Published: May 2021

Traditional houses in Guanzhong area are typical regional sustainable green buildings, which contain ecological wisdom and cultural connotations that are in harmony with the environment. This article takes Xiaojiapo Village in Lantian County as the research object. Based on the integration of traditional residential culture inheritance and green development, this paper conducts a more systematic study on settlement site selection, courtyard layout, and building structure. “Road” Shaanxi section of traditional residential building art and folk culture subject research has added results, and also provides an early stage for the protection and inheritance of traditional residential buildings in the Guanzhong area.
Research on the Green Evaluation System of Large Public Buildings
Authors: Chen Hong , Luo Wei , Zhao Fengbing , Fu Dehong , Cheng Shiyun
Published: May 2021

This paper introduces green construction from the entry point of a public building in Chongqing and analyzes its development status in China. The important role of green construction evaluation is a key issue in green construction. Nowadays, China does not yet have a compact evaluation model and system that fits the national conditions, which is scientific, and gives full play to evaluation, standardization, and guidance of green construction. Through the evaluation of three green construction evaluation models of China’s construction engineering green construction evaluation standards, British Building Research Establishment Environmental Assessment Method (BREAM), and Leadership in Energy and Environmental Design (LEED), the separate analysis and comparison of different systems are made. The results could provide supports for green construction evaluation models and systems and also promote the long-term development of green construction in China.
Analysis of the Enlightenment of Wright’s Organic Thought to Chinese Contemporary Architecture
Authors: Lu Wang
Published: May 2021

Frank Lloyd Wright is one of the most important architects in the United States in the 20th century. His idea of organic architecture has a great influence on the modern architecture of the world. The contents of “nature”, “organic” and “unity of nature and man” in organic architecture have been recognized and paid more and more attention all over the world. By analyzing the relationship between Lai’s unique machine architecture thought and Chinese classical philosophy, the application value of organic thought to Chinese contemporary architecture has been found.
Study on landscape design of urban riverside green space based on environmental behavior——Take the small garden of Nanchuan East Road in Xining City as an example
Authors: Zhiman Zhang , Xianyu Zhang
Published: May 2021

Urban riverside green space is not only an important part of urban ecosystem, but also an important carrier of urban civilization, but also a green space for people to travel and relax every day. This paper summarizes the connotation of urban riverside green space and environmental behavior, discusses the interaction between landscape design and visitor psychology and behavior from the perspective of environmental behavior, and designs the landscape design of Nanchuan East Road Park in Xining City with functional zoning as the starting point.
Vibration response law of high-rise building to tunnel blasting
Authors: Ding Xinyu , Ji Xinyu , Gao Shang , Sun Zhongbo , Wang Hailiang
Published: May 2021

In order to study the propagation and attenuation process of blasting seismic waves on high-rise buildings, taking the blasting construction of the entrance A of Xizhen Station of Qingdao Metro Line 1 as an example, the vibration velocity of the 33-story frame structure under the blasting construction condition were analyzed. The results show that: under the action of blasting seismic waves, the vertical vibration velocity of the building structure is greater than the horizontal direction; the vibration velocity of the underground structure of the building presents an oscillation trend, the vibration velocity of the above-ground structure decays rapidly, and there is an elevation amplification effect on the top floor; the research results have certain reference significance for urban blasting construction, monitoring, and seismic protection measures of high-rise buildings.
The Effect of Orchestra Pit Diffusion on the Auditorium Acoustics of Opera House
Authors: Yian Chen , Yuezhe Zhao
Published: May 2021

A scale model of the Zhuhai Opera House, with 7 kinds of simulated orchestra pits, was made and analyzed in an experiment. The pulse response of the auditorium of the opera house was measured and analyzed. The results show that diffusion treatments for the orchestra pit can affect the sound transmission of stage source, increasing C80 and D50 in the rear part of the auditorium and can also affect the sound transmission of pit source, making the average value of G in the auditorium rise. As well, no significant changes were found on EDT and T20 under the diffusion treatment of the orchestra pit.
Evaluation of BioPlex 2200 tTG-IgA Diagnostic Performance for Serology-Based Diagnosis of Celiac Disease
Authors: Pacheco M Cristina , Lee Dale , Dickerson Jane
Published: May 2021

Objectives

Forgoing biopsy for the diagnosis of celiac disease in children with tissue transglutaminase immunoglobulin A (tTG-IgA) levels greater than or equal to 10 times the upper limit of normal (≥10×ULN) has been advocated by the European Society of Paediatric Gastroenterology, Hepatology and Nutrition.

Methods

Our retrospective study tested the specificity and positive predictive value (PPV) of the BioPlex 2200 assay (Bio-Rad Laboratories) in diagnosing celiac disease at the ≥10×ULN tTG-IgA threshold, which is ≥150 U/mL (negative <15 U/mL). We used the tTG-IgA and duodenal biopsy results within 6 months following tTG-IgA measurements from 542 patients who had any number of duodenal biopsy fragments, of whom 165 patients had 5 or more tissue fragments. Sensitivity and specificity of the test were calculated using histology as the gold standard for Marsh class 2 and above.

Results

For histopathologic findings in the duodenum with Marsh 2 and higher, the specificity and PPV of the BioPlex 2200 at ≥10×ULN tTG-IgA were 99.5% and 95.4% using all biopsies and 97.9% and 94.9% for biopsies with 5 or more tissue fragments.

Conclusions

Should clinical considerations preclude endoscopy, the BioPlex 2200 assay at ≥10×ULN TTG-IgA could be considered highly suggestive of disease.
Interspecific aggression in sympatry between congeneric tropical birds
Authors: Drucker Jacob R , Senner Nathan R , Gomez Juan Pablo
Published: May 2021

Interspecific aggression may shape species distributions through competitive exclusion, resulting in spatial segregation, or facilitate sympatry as an adaptive mechanism for resource partitioning. Competitive exclusion results from asymmetric aggression of one species towards another, but if the aggressive relationship between species is symmetric, they may persist in sympatry. Interspecific aggression is widely cited as a mechanism for maintaining the distributional limits of tropical birds, but how it shapes the spatial dynamics of competing species that are sympatric over larger geographic areas is less clear. To address this issue, we conducted reciprocal playback experiments on two congeneric Antbirds — Thamnophilus atrinucha and T. doliatus — that occur in sympatry across a habitat matrix in Colombia to characterize their relationship as symmetrically or asymmetrically aggressive and analyzed point count data to assess the degree to which they occur sympatrically. We found weak evidence for competitive exclusion, with the larger T. doliatus responding asymmetrically to T. atrinucha, and the two species having a low co-detection rate during point counts. However, despite their 22% difference in body size, T. atrinucha still responded to T. doliatus playback in over half of our trials, and the two species co-occurred on nearly 25% of point counts, indicating that interspecific aggression does not drive complete spatial segregation. Our findings highlight how the degree to which one species can competitively exclude another may vary, especially across a dynamic landscape.
Sparse allele vectors and the savvy software suite
Authors: LeFaive Jonathon , Smith Albert V , Kang Hyun Min , Abecasis Gonçalo
Published: May 2021

The sparse allele vectors file format is an efficient storage format for large-scale DNA variation data and is designed for high throughput association analysis by leveraging techniques for fast deserialization of data into computer memory. A command line interface has been developed to complement the storage format and supports basic features like importing, exporting and subsetting. Additionally, a C++ programming API is available allowing for easy integration into analysis software.

Availability and implementation

https://github.com/statgen/savvy.

Supplementary information

Supplementary data are available at Bioinformatics online.
Biochemical markers for pregnancy in the spent culture medium of in vitro produced bovine embryos
Authors: de Oliveira Fernandes Gabriela , Milazzotto Marcella Pecora , Fidelis Andrei Antonioni Guedes , Kawamoto Taynan Stonoga , de Oliveira Leme Ligiane , de Lima Camila Bruna , Franco Maurício Machaim , Dode Margot Alves Nunes
Published: May 2021

The present study aimed to identify biomarkers to assess the quality of in vitro produced (IVP) bovine embryos in the culture media. IVP embryos on Day (D) 5 of development were transferred to individual drops, where they were maintained for the last 48 h of culture. Thereafter, the medium was collected and the embryos were transferred to the recipients. After pregnancy diagnosis, the media were grouped into the pregnant and nonpregnant groups. The metabolic profiles of the media were analyzed via electrospray ionization mass spectrometry, and the concentrations of pyruvate, lactate, and glutamate were assessed using fluorimetry. The spectrometric profile revealed that the media from embryos from the pregnant group presented a higher signal intensity compared to that of the nonpregnant group; the ions 156.13 Da [M + H]+, 444.33 Da [M + H]+, and 305.97 Da [M + H]+ were identified as biomarkers. Spent culture medium from expanded blastocysts (Bx) that established pregnancy had a greater concentration of pyruvate (p = 0.0174) and lesser concentration of lactate (p = 0.042) than spent culture medium from Bx that did not establish pregnancy. Moreover, pyruvate in the culture media of Bx can predict pregnancy with 90.9% sensitivity and 75% specificity. In conclusion, we identified markers in the culture media that helped in assessing the most viable IVP embryos with a greater potential to establish pregnancy.