Search

In the past three years, Augmented Reality (AR) / Virtual Reality (VR) industry gradually emerges from concept into the market. Due to the technology and other various factors, the industry at the beginning of the molding is frustrated. Moreover the sudden COVID-19 outbreak in 2020 has brought new market changes at home and abroad. Based on this background, this paper analyzes the specific changes or difficulties faced by AR/VR industry under the new situation especially the attitude to the 5G, and on this basis puts forward feasible industrial transformation strategy. It is expected to provide new ideas and referential experiences for the industry research and development team, enterprises and academic researchers.

Photovoltaic power output forecast error exists objectively and inevitably, and it can provide a guarantee for safe and stable operation of the power system through analyzing its characteristics. In this paper, the influence of predicted output fluctuation characteristics (predicted output amplitude and power variation) on prediction error was studied based on the analysis of variance (ANOVA) method. The prediction error conditions were classified into six types based on the clustering of numerical characteristics of predicted output. Then, a Generalized Gaussian Mixture Model (GGMM) was proposed to fit the prediction error distribution of each type of photovoltaic output. The mean absolute error (MAE), coefficient of determination (R2), and root mean square error (RMSE) were used as accuracy evaluation indexes. The example analysis showed that the GGMM can satisfy the asymmetry and kurtosis diversity of the error distribution after division by conditions, and the fitting result is better than that of the normal distribution, improved Laplace distribution and t Location-Scale distribution model.

In this paper, NSGA-Ⅱ is used to realize the dual-objective optimization and three-objective optimization of the solar-thermal photovoltaic hybrid power generation system; Compared with the optimal solution set of three-objective optimization, optimization based on technical and economic evaluation indicators belongs to the category of multi-objective optimization. It can be considered that NSGA-Ⅱ is very suitable for multi-objective optimization of solar-thermal photovoltaic hybrid power generation system and other similar multi-objective optimization problems.

Because of the water conservancy project construction to the environment has brought a lot of damage, the state for environmental pollution and damage problems began to carry out a comprehensive restoration, for the relevant environmental protection and restoration policies are also improving, with the implementation of relevant measures, ecological water conservancy projects will play a vital role in environmental governance. In order to put forward suggestions for ecological restoration of white rose reservoir, this paper puts forward suggestions for ecological restoration from the geographical location of the water conservancy project, the measures in the construction process and the operational measures after completion, so as to restore the ecological role played by the ecological area before the completion of the water conservancy project and reduce the secondary pollution and damage to the environment in the operation process after it. This paper discusses the importance of ecological water conservancy project in environmental governance, and takes Shirase reservoir as an example, puts forward the ecological restoration suggestions for the water conservancy project. In order to restore the ecological function of the area before the water conservancy project and reduce the secondary pollution and damage in the operation process, it is suggested to improve the area from three aspects: geographical location, construction process and operation measures after completion. Through the implementation of ecological restoration measures, it will help to realize the harmonious symbiosis between man and nature.

The Yangtze River protection is an important environmental protection strategy for China, and the quality and efficiency of the sewage system is also one of the environmental protection actions that China is working hard to implement in recent years. As the first batch of pilot cities for the protection of the Yangtze River, Wuhu City has significantly improved its sewage system through a series of comprehensive sewage system improvement engineering measures. This paper briefly described the general situation and measures of the sewage system renovation project in the CD area of Wuhu City, and based on the systematic thinking of “source-network-plant-river”, the performance of improving the quality and efficiency of the sewage system was evaluated. With the implementation of the sewage system remediation project, the water quality at the source and discharge outlet as well as the water quantity of sewage collected had been greatly improved. The sewage collection volume had been increased from 10,000 m3/d to 42,000 m3/d and the COD concentration of the influent has increased significantly. The introduction and analysis of this project may provide some reference for other similar sewage system remediation projects in China and other countries and regions.

The rapid industrialization process has brought about explosive growth in the types of chemicals and the widespread and extensive usage of chemicals. These chemicals enter into the aquatic environment with their application in industry and daily life, posing a security threat to natural water bodies and public health. It is necessary and urgent to carry out risk assessment of these new pollutants or micro-pollutants in water. Therefore, this paper reviewed the research progress and development direction of health risk assessment and ecological risk assessment of emerging contaminants in aquatic environment, and prospected the research and application in China. This paper proposes that it is necessary to deeply study the public health effects, environmental effects and migration and transformation characteristics of these emerging contaminants in water, and to understand their toxicological effects, so as to establish a sound risk assessment benchmark and method as soon as possible to help water resources management and water security.

Emerging contaminants in water have attracted more and more attention from scholars and the public. Various technologies have been gradually studied and applied to remove emerging contaminants in water, including adsorption technology based on carbon materials, membrane separation technology, advanced oxidation technology and constructed wetland. In this paper, the research progress of these technologies is reviewed, especially for photocatalysis, a promising technology, which is analyzed in detail. Immobilization is an important means for photocatalytic technology to be applied in engineering. In this paper, four existing immobilization methods of photocatalytic materials are analyzed, and the existing research is prospected. More in-depth research is urgently needed, and exploratory research aimed at application is encouraged. This study can provide some ideas and reference for the treatment of emerging contaminants in water.

Urban runoff pollution has become one of the important limiting factors hindering the continuous improvement of water environment. In the process of drainage system reconstruction, the evaluation of interception pipeline for the collection and storage efficiency of initial rainwater is an important work. Therefore, this study uses the analytic hierarchy process to establish an evaluation system and method containing 4 first-level indicators and 10 second-level indicators to evaluate the comprehensive efficiency of the interception pipeline for initial rainwater collection and storage. Taking the interception pipeline in a drainage system in Shanghai as a case study, the established evaluation method was adopted to evaluate it, and the comprehensive indexes under the rainfall return periods of 0.5 year, 1 year, 3 years and 5 years were calculated. The results indicated that the evaluation method could be well applied to the effectiveness evaluation of intercepting pipelines in drainage systems, and could provide technical support for the planning and design of urban runoff pollution control projects in the future.

Combined sewer overflow (CSO) pollution is the main factor that plagues the water environment in the area with combined sewer system in most cities of China. This paper analyzed CSO pollution, and reviewed the measures to solve CSO pollution and the latest research progress. The problems of traditional river interception projects were analyzed, and optimization and improvement ideas were proposed. Finally, a combined optimization scheme of source reduction-process control-end storage was proposed to control CSO pollution, which could provide reference for urban CSO pollution control in China.

Riverbank integrated super-magnetic separation (ISMS) played an important role in river water (RW) environment management when the diminishing of suspension is a major task. This paper provides a comprehensive analysis of its operation performance from the perspective of pollutant controlling and carbon mitigation potential using the method proposed by intergovernmental panel on climate change. The results showed that turbidity of discharge from ISMS is maintained below 3 NTU and total phosphate removal above 85%. From ISMS to sludge dewater and final incineration, the net carbon emission can is negative at -0.07 kgCO2/m3RW thanks to incineration with combined heat and power generation and cement substitute by slag. The indirect carbon emission associated with the use of PAC and PAM contributed 79% of the total emissions which amounted to 0.087 kgCO2/m3RW. Future work is suggested on accurate dosing adjustment for cost reduction and carbon mitigation.

The reclaimed water produced by sewage treatment plants can be reused for many purposes, which has gradually been paid great attention. However, its pricing mechanism has not been well established especially in China, which has brought certain restrictions on the wide application of reclaimed water. Therefore, this paper attempts to analyze the current situation of domestic reclaimed water pricing, combined with the research and analysis of reclaimed water production costs and related industry profits, and gives the recommended reclaimed water pricing. Taking the reclaimed water reuse project in Ningbo, China as an example, the cost and profit are analyzed by season. The recommended price in non-winter is 0.3833 yuan/ton, and the recommended price in winter is 0.4283 yuan/ton. This study may provide some reference for the improvement of the pricing mechanism of reclaimed water, thus contributing to the wide application of reclaimed water.

The drainage and sewage interception project hi Zhaoyang District involved the installation of a DN1000 municipal sewer pipeline with a total length of 1541 m. Considering factors such as geological conditions, pipe diameter, buried depth, groundwater level, as well as the impact of nearby underground and aboveground structures and traffic, the trenchless construction method of pipe jacking was selected for implementation. The pipeline followed the route of Weiba Road, crossed Jinying Avenue, and then proceeded along the Second Ring East Road until it reached the bank of Yaowan River. The project design took into account practical considerations, including the sewer pipe diameter, material selection, pipeline routing, construction of pipe jacking starting shafts, and the design and modification of arriving shafts, in line with the specific engineering requirements.

The drilling and shut-in regulations for peripheral oil fields currently follow the standard of the old area of placanticline, i.e., the wellhead pressure of water injection wells within 600m of the drilling well is reduced to below 3MPa before drilling. The regulations did not take into account the depth of the target formation, structural development, reservoir properties and oil and water well connectivity in the peripheral oilfield, which made it difficult to relieve pressure in most of the wells and resulted in longer drilling and shut-in cycles and greater impact on production. In order to minimize the impact of drilling and shut-in on field development and to explore drilling and shut-in limits and standards suitable for peripheral fields, drilling tests were conducted in Block A for infill wells. The feasibility of high pressure drilling in the peripheral low permeability oilfield was analyzed by analyzing the drilling site conditions, the quality of post-completion cementing and the logging data of the completed wells under different pressure conditions.

CO2 flooding technology in ultra-low permeability reservoir is the key technology in modern oilfield technology development, which plays a key role in oilfield exploitation of ultra-low permeability reservoir. In this paper, CO2 flooding technology for ultra-low permeability reservoir in oilfield is analyzed and studied. The main characteristics of ultra-low permeability reservoir in oilfield are briefly analyzed, and the development of CO2 flooding technology is discussed. At the same time, the application of CO2 flooding technology in ultra-low permeability reservoir of XX Oilfield is studied and summarized.

DP980 is a promising light-weightening material in car body. To avoid high investment of strong cooling system, a new DP980 steel with low cooling rate requirement was developed. The mechanical properties and microstructure were analyzed under different manufacturing process. It could be concluded that the chemical composition design should be reasonable and of low cost to achieve both high strength and also austenite to martensite transformation at low cooling rate. Strength increased with coiling temperature decreasing during hot rolling, and higher annealing temperature and lower over aging temperature were favourable to higher strength. The austenite-martensite transforming could be completed at even lower rapid cooling rate of 20°C/s. Through optimized manufacturing process parameters, the new DP steel product with good mechanical properties could be obtained successfully, which provided a new option for normal production line to produce ultra high strength steel.

Firstly, this text is introducing the traditional technology of vertical billet. Secondly, the text is describing technological process and equipment principle about first and second generation vertical billet machine. Thirdly, the text is illustrating the second generation machine’s superiorities by contrasting. Finally, we have put forward the thought of optimal to the second generation machine.

In this paper, a mechanical device is introduced, which changes the driving direction of the force through a conical gear, so as to achieve the goal of simulating the actual working state of the kitchen water TAP and improve the accuracy of detection.

Annealing process is critical to mechanical properties and microstructure of DP steel. For DP steel with strength grade of 590MPa, experiments with different combinations of intercritical annealing temperature and over-aging temperature were carried out during annealing. The tensile tests of the final products and nanohardness tests of different phases were made, and the microstructures were analyzed. The results indicated that higher intercritical annealing temperature was favorable to higher volume fraction of martensite and lower nanohardness of martensite with lower C density. The ultimate tensile strength increased monotonously with the volume fraction of martensite increasing. Higher over aging temperature would make martensite islands be partially resolved and carbides precipitate, which made lower volume fraction of martensite, and resulted in lower nanohardness of martensite. The revealed rules could provide important guide to control material properties of DP steel by manipulating annealing process.

Despite the rapid growth in the uptake of renewable energy technologies, the educational profile and the skills gained at University level do not always comply with the practical needs of the organisations working in the field. Furthermore, even though the residential sector has very high potential in curbing its CO2 emissions worldwide thus meeting the challenging goals set out by the international agreements, such reduction has been limited so far. Within this context, the ‘Skybelt’ project, co-funded by the EU under the framework of the Erasmus + programme aims at enhancing in several Universities of Asia and Europe the engineering skills of students of all level for application of sustainable renewable energy solutions in the built environment. With the target of increasing the employability of graduates and the impact of the project, a survey on the labour market needs for specialists with enhanced knowledge and skills in the topic of the project has been conducted in the related Asian countries. Hence, relevant industries, labour market organisations and other stakeholders have been interviewed and the main results of this analysis is reported in the present paper. As first outcome of this activity, the obtained results have been considered in the selection of the modules to be improved according to a student centred study approach.

With the continuous and high-speed growth of economy, people's requirements on product quality are increasing year by year, including ceramic brick products, which, as a typical building materials product, are widely used in all kinds of buildings of different sizes. Quality of brick of pottery and porcelain products mainly in the form of through the examination and evaluation. The uncertainty of measurement as an important part of the test results, is an important parameter characterization of the reliability of the measurement result. Therefore, this paper, the source of uncertainty in linear thermal expansion coefficient measurement of ceramic brick is analyzed, using the measurement results and related data, and concludes that for the linear thermal expansion coefficient average of 0.016%. when the report 2 sample average, the expanded uncertainty U (A) = 1.48%, contains the factor k = 2.

The invention discloses a method and a device for detecting the drainage flow rate of a hidden water tank. The method of real-time communication between electronic scale load-bearing device and profinet is proposed to realize the detection of drainage flow. The device consists of electronic scale load-bearing device, high-speed electronic scale acquisition module, PLC lower computer, touch screen man-machine interaction layer and so on. The device achieves fast detection response time and ensures sample integrity. It also avoid the problem of slow response of the input type liquid level sensor and inconvenient installation of magnetostrictive liquid level sensor.

This paper makes use of the sounding data of 43 sounding stations located in western China from 2016 to 2019 and takes the PWV-ZWD (precipitable water vapor and Zenith wet delay) conversion coefficient K calculated via numerical integration as the reference value to study the applicability of using a K-value model for PWV-ZWD conversion in western China. Six groups of stations with similar latitude and increasing altitude difference were selected to identify how the K-value model varies with elevation. Also, the K-value model was employed to invert the PWV of eight sounding stations in 2019 to verify the usability of the model. As shown by the results, the establishment of the regional model has contributed to the improvement of model accuracy; the K-value model assumes a higher accuracy in flatter terrains; there is a

In this paper, 24 C-level control points under different terrain conditions were selected to be the testing points. The binary-satellite system (GPS+GLONASS) and the triple-satellite system with BeiDou Navigation Satellite System (BDS) (BDS+GPS+GLONASS) were adopted for static measurement; and the observation data from BeiDou Ground-based Augumentation System (GBAS) base stations in Guangxi were collected for solution. By comparing the residuals of GPS tri-dimensional baseline vectors and the internal accord accuracy of each control point under the binary and triple-satellite systems, the effect of data collected by different satellite systems under different terrain conditions on measurement accuracy was studied. According to the results, (1) the triple-satellite system with BDS showed more stable measurement accuracy; (2) in plane, the two systems were of equivalent measurement accuracy in mountainous and flat areas; in elevation, the triple-satellite system showed higher and more stable measurement accuracy.

The current research presents the design of a 4-degree-3-level performance evaluation indicator system of rational use of drugs for health care institutions accord with the Balanced Score Card (BSC) method. Financial index, patient index, professional process index, and development and blazing new trials index are adopted in the light of scientific, guiding, operable and generalizable principles. The index weight is based on the analytic hierarchy process, and comprehensive performance evaluation indicators are calculated by a linear integrated weighting method. Its practical application in 21 state-run health care institutions in Ningbo, from 2008 to 2012, has arrived at the finding that the comprehensive performance evaluation indicator system offers a scientific, practical and effective performance management quantification and is thus worth popularizing.

As Hadoop has gained popularity in big data era, it is widely used in various fields. The self-design and self-developed large-scale network traffic analysis cluster works well based on Hadoop, with off-line applications running on it to analyze the massive network traffic data. On purpose of scientifically and reasonably evaluating the performance of analysis cluster, we propose a performance evaluation system. Firstly, we set the execution times of three benchmark applications as the benchmark of the performance, and pick 40 metrics of customized statistical resource data. Then we identify the relationship between the resource data and the execution times by a statistic modeling analysis approach, which is composed of principal component analysis and multiple linear regression. After training models by historical data, we can predict the execution times by current resource data. Finally, we evaluate the performance of analysis cluster by the validated predicting of execution times. Experimental results show that the predicted execution times by trained models are within acceptable error range, and the evaluation results of performance are accurate and reliable.

Smart LED illumination system can use the power from whether the photovoltaic cell or the power grid automatically based on the SOC (State Of Charge) of the photovoltaic cell. This paper proposes a feedback control of the photovoltaic cells and a dynamic control strategy for the Energy system. The dynamic control strategy is used to determine the switching state of the photovoltaic cell based on the illumination load in the past one hour and the battery capacity. These controls are manifested by experimental prototype that the control scheme is correct and effective.

The synergistic effects of methylphenyl-polsiloxane solid powder and organophosphate flame retardant for polycarbonate (PC) were investigated by limiting oxygen index(LOI), and cone calorimeter. It was found that the LOI of the flame-retarded PC (FR-PC) with polysiloxane and organophosphate binary flame retardants didn’t increase in comparison with that of FR-PC containing a single species flame retardant. The cone calorimeter results show that the heat release rate (HRR) of the PC/polysiloxane/organophosphate(PX230) composition is approximately 50% lower than that of the PC/polysiloxane or the PC/PX230. Total heat release (THR) of PC/polysiloxane/PX230 also significantly reduce in comparison with that of PC/polysiloxane and PC/PX230 binary composites, which indicates a clear synergistic effect of the polysiloxane and PX230 in the PC flame retardant composites. The CO production rate of the PC/polysiloxane/PX230 during combustion is slightly lower than that of the virgin PC. So the combination of the polysiloxane with PX230 used in PC could synergic inhibit the combustion heat release, and achieve environmental friendly fire-retardant effect.