NOTICE OF RETRACTION: While investigating potential publication-related misconduct in connection with the ICIMTech 2021 Conference Proceedings, serious concerns were raised that cast doubt on the integrity of the peer-review process and all papers published in the Proceedings of this Conference. The integrity of the entire Conference has been called into question. As a result, of its investigation, ACM has decided to retract the Entire Conference Proceedings and all related papers from the ACM Digital Library.
Fluorescent carbon quantum dots (r-CDs) were synthesized safely and readily by stirring at room temperature with a yield of 76.5%. The synthesized r-CDs exhibit bright green emission with an absolute quantum yield of 12.0% under the excitation of ultraviolet light. Within the pH range of 3–12, the r-CDs exhibit excellent fluorescence stability. Interestingly, the fluorescence intensity of r-CDs faded promptly when the pH value diminished to 2 and then regained when the pH value returned to 3. This means that r-CDs can be used as "on–off–on" fluorescent probes for pH sensing. The mechanism of this sensitive pH response behavior was discussed in detail, and a possible mechanism of protonation–deprotonation–protonation processes was proposed. In addition, we have proposed a green preparation route for eco-friendly filter paper using anticounterfeiting. Interestingly, the presence of Fe2+ significantly quenched the fluorescence of r-CDs. Experimental results demonstrated the r-CDs can also be used to detect the content of Fe2+ in water, and the detection limit was 8.82 μM/L.
To increase probability on found, and decrease the speed to information process, and to extract and recognize target intelligently and rapidly, the background and mechanism of quantum cryptography, and the domestic and international recent research is introduced, and the relative evaluation merits and development of single photon detectors have been analyzed, while the special operation principle and several kinds of work patterns in single photon detection are studied.
Vehicular Ad-Hoc Networks (VANETs), as the cru-cial support of Intelligent Transportation Systems (ITS), have received a great attention in recent years. Network traffic prediction is useful for network management and security in VANETs, such as network planning and anomaly detection. Due to the movement of nodes, the traffic flow in VANETs consists of a great number of irregular fluctuations, which is the main challenge for network traffic prediction. This paper proposes a novel algorithm, which combines Deep Q-Learning (DQN) and Generative Adversarial Networks (GAN) for network traffic prediction. We use DQN to carry out network traffic prediction, in which GAN is involved to represent Q-network. Meanwhile, the generative network can increase the number of samples to improve the prediction error. We evaluate the performance of our method by implementing it on two real network traffic data sets. Finally, we compare the two state-of-the-art competing methods with our method.
Abstract Under the guidance of the Party Central Committee and the State Council, China’s environmental protection initiatives have made remarkable achievements, both in terms of system optimization and in terms of solving problems left by history. The masses also put forward suggestions and opinions on the achievements of China’s environmental protection departments, and the public awareness of environmental protection has been constantly enhanced. In this context, more and more enterprises and individuals begin to pay attention to the changes in environmental quality. Surface water quality monitoring, as an important task to clarify the environmental quality of surface water, provides a wealth of information for the relevant technical personnel to clarify the change of environmental quality. Therefore, in the process of design and production, our environmental protection personnel and other industry engineers will put forward the requirements for quality monitoring of surface water where the project is located, and different industries have different requirements for their testing accuracy. It can be seen that improving surface water quality monitoring has become an urgent task for environmental protection engineers.
The present study formulate fitness evaluation standard of male college students on physical education major,in order to assess the development level of indicators quantitatively and objectively.Therefore,this paper researched on 190 junior male students from class 2005 to class 2008 in physical education college of Yunnan Normal University,and took their 10 fitness index for the sample,worked out the evaluation standard of scoring and grading 10 fitness index of the physical education major male students in percentile method.This study was to provide a reference of feedback physical education and training effects.
In order to study the influence of uneven ground settlement on the stress and deformation of CRTs III slab ballastless track, a three-dimensional finite element model of CRTs III slab ballastless track subgrade ground is established in this paper. The stress and deformation of CRTs III slab ballastless track under the condition of the uneven ground settlement are analyzed by using this model. The results show that when the uneven ground settlement occurs, the ballastless track structure will follow the settlement, the bonding between the layers of the ballastless track structure is good, and there is a gap between the base plate, the subgrade bed, and the ground. At the beginning and end of the ground settlement, the upper surface of the track structure is in a tension state, and at the center of the ground settlement, the upper surface of the track structure is in a compression state. When the amplitude of ground settlement increases, the settlement displacement and longitudinal stress of ballastless track structure increase linearly, and the void between ballastless track and subgrade bed, subgrade bed, and ground intensifies. When the land settlement wavelength increases, the settlement displacement of the ballastless track structure first increases and then tends to be stable, and the longitudinal stress of the track structure first increases and then decreases. When the land settlement wavelength is 20m, the longitudinal stress of the track structure reaches its peak.
In the semiarid grassland ecosystems of eastern Inner Mongolia, the interrelations among the species diversity of different plant communities, productivity, soil nutrients and climate were thoroughly studied through integrated approaches combined with the sample method, correlation analysis and structural equation modelling (SEM) model. The results show that the colonization of perennial grasses was promoted in the wetter and colder climate conditions. The productivity was determined by the perennial grasses, while species diversity was dominated by the perennial forbs. We obtained a U-shaped relationship between biomass and species diversity, which indicated two different strategies for the interaction between grassland biomass and diversity. In our study, air temperature and plant biomass were determined to be the main two indicators of plant species diversity variation. Meanwhile, distinct mutual constraints existed between the biomass of grassland dominant species and species diversity. Furthermore, soil nutrient conditions and climatic factors were found to jointly affect grassland productivity. This study will be helpful in providing deep insight into the dynamics of plant species diversity and the main interactive influencing factors in the semiarid steppe ecosystem and will provide a scientific basis for the maintenance of plant diversity and ecosystem functions in this region.
Diffractive optical elements (DOEs) with rotationally symmetric phase distribution are mainly produced by laser direct writing technique in polar coordinate system, which has slow processing speed and limited fabrication area. In this paper, we propose a stepwise rotational splicing method that introduces a low-cost rotary table in a DMD-based maskless lithography system. DOEs with rotationally symmetric phase distribution are fabricated by exposure of splicing units and rotation of rotary tables. The jumpiness of the rotational center is accurately calculated by graphical analysis of a circular single-point substrate. According to the jumpiness, a new splicing unit is designed and used for exposure. It could compensate for the splicing error caused by the jumpiness of the rotational center. Then the rotary table rotates 0.0053° to expose the splicing unit again, which could achieve the effect of pixel spatial dislocation coverage. While increasing the fabrication area, it significantly improves the edge sawtooth of DMD fabrication graphics and reduces the splicing errors caused by quantization. The diameter of the fabricated Fresnel zone plate was increased from 5.25mm to 11.40mm, and the fabrication area was 4.72 times the original. The splicing error of 2.64μm has been eliminated after optimization, and the edge sawtooth has been smoothed. The diffraction results show that the method not only can produce large area and high quality diffraction elements, but also greatly reduce the processing cost.
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