•The porosity of the geopolymer decreases with the level of fly ash replacement.•The fly ash substitution leads to higher autogenous shrinkage and lower drying shrinkage.•The geopolymer mortars ...provide lower total shrinkage than the pastes.
This study investigates the pore structure and shrinkage behavior of metakaolin-based geopolymer pastes and mortars containing 0–30% fly ash. Fly ash substitution decreases average reactivity of the solid precursors, resulting in a lower reaction rate and accompanying longer reaction time. Composition of the sodium aluminosilicate (N-A-S-H) gel formed in the geopolymers has been changed, and the continued reaction after hardening of the pastes generates a more compact binding gel phase with lower Al/Si ratio. Refinement of the pore structure entails a higher capillary tension developed in the binders to increase the autogenous shrinkage, but also restricts the water evaporation from the pore networks, resulting in a decreased drying shrinkage. The geopolymer mortars provide higher compressive strength and lower total shrinkage when compared with the pastes.
In recent years, China’s Internet industry has developed rapidly, and the Internet has penetrated into all aspects of people’s daily lives. As an emerging transaction model, rural e-commerce is an ...important channel for precise poverty alleviation. To be specific, rural e-commerce can greatly change the lives of rural people in one way or other ways, thus allowing rural consumers to purchase high-quality and inexpensive goods without having to leave home. In other words, the introduction of national e-commerce into rural areas has changed the lifestyle of rural residents, providing them with great convenience in their daily lives. According to statistics, the level of rural e-commerce development in coastal areas is much higher than that in the mainland, while inland areas are hesitant to develop. Rural areas are a crucial component of Chinese society, and the rural economy is also the main driving force of China’s agricultural economy. In an environment where e-commerce is gradually penetrating various fields, the development of rural e-commerce in China has become more urgent with the new and growing rural demand. To be specific, the development of rural e-commerce has become a hot topic in recent years, and it is necessary to gather efforts from all sides to explore and innovate, so as to promote the healthy and orderly growth of rural e-commerce in China. As one of the effective ways to solve the problems of agricultural industry development and farmers’ affluence, rural e-commerce has played an increasingly obvious role in industrial development, poverty alleviation, employment, and solving the problems of selling agricultural products. At the same time, the proportion of national online sales of agricultural products is also increasing year by year. Many rural areas have abundant natural resources, rich history and culture, and a pleasant ecological environment. As a result, a great number of rural areas are well suited for e-commerce development in terms of the overall environment and physical resources. In recent years, the development of rural e-commerce in China has been very rapid, but it has also revealed many problems. Therefore, an in-depth study of the regional factors affecting the development of rural e-commerce is helpful to provide a reference for its better development. Based on the analysis of the current situation of rural e-commerce development, this study collects and organizes the indexes of influencing factors of rural e-commerce. The index system of influencing factors of rural e-commerce development is constructed through data collection and so on. After that, this study adopts the regional fuzzy information theory to evaluate the potential of rural e-commerce development, so as to obtain the main influencing factors of rural e-commerce development.
The protein–nanoparticle (NP) interface is a current frontier of multiple disciplines, full of challenges and opportunities. The unique behaviors of nanomaterials (NMs) bring many exciting ...applications, and also raise safety concerns. Beyond bioapplications, various NMs could also enter human bodies from the environment. When entering human bodies, NPs interact with various biomolecules, especially proteins, forming a protein corona. This protein–NP complex is what the biosystems 'see' and 'respond to'. Therefore, understanding how NPs interact with proteins is crucial for both bioapplications and the biosafety of NMs. In this review, the current understanding of protein–NP interactions is summarized, including the theoretical background, experimental results, and computational progresses. Guidelines for improving bioapplication performance and reducing the potential biosafety hazard of NMs by designing the protein–NP interactions are discussed, along with future directions and challenges in this exciting field.
Protein–nanoparticle (NP) interaction is the first step when nanomaterials (NMs) enter the human body, forming a protein corona. Understanding the protein–NP interaction is crucial for both the bioapplications and safety of NMs. The current understanding of these interactions is summarized and guidelines are proposed to improve bioapplication performances and to reduce potential biosafety hazards of NMs by designing the protein–NP interactions.
Inspired by the multiplier Hopf algebra theory introduced by A. Van Daele, this paper introduces a new algebraic structure, a multiplier Hopf coquasigroup, by constructing the integral dual of an ...infinite-dimensional Hopf quasigroup with faithful integrals. Then, it shows that the biduality theorem also holds for Hopf quasigroups and multiplier Hopf coquasigroups of the discrete type.
The accurate depth imaging of piled products provides essential perception for the automated selection of individual objects that require itemized food processing, such as fish, crabs, or fruit. ...Traditional depth imaging techniques, such as Time-of-Flight and stereoscopy, lack the necessary depth resolution for imaging small items, such as food commodities. Although structured light methods such as laser triangulation have high depth resolution, they depend on conveyor motion for depth scanning. This manuscript introduces an active dual line-laser scanning system for depth imaging static piled items, such as a pile of crabs on a table, eliminating the need for conveyor motion to generate high-resolution 3D images. This advancement benefits robotic perception for loading individual items from a pile for itemized food processing. Leveraging a unique geometrical configuration and laser redundancy, the dual-laser strategy overcomes occlusions while reconstructing a large field of view (FOV) from a long working distance. We achieved a depth reconstruction MSE of 0.3 mm and an STD of 0.5 mm on a symmetrical pyramid stage. The proposed system demonstrates that laser scanners can produce depth maps of complex items, such as piled Chesapeake Blue Crab and White Button mushrooms. This technology enables 3D perception for automated processing lines and offers broad applicability for quality inspection, sorting, and handling of piled products.
With the continuous progress of network information technology, mass media has become increasingly developed, and Chin’s cultural and entertainment industry has also shown a more diverse scene. At ...the same time, the development of the cultural and entertainment industry has brought about the development of fan culture. The existing fan base in China is constantly increasing, and the current fan stigmatization is becoming increasingly serious. This article explores the current fan stigmatization in mass media and the reasons behind it. By analyzing the factors such as rapid information diffusion of mass media, group aggression of fan groups, irrational behavior of minority fan groups, and highly binding relationship between fans and idols, the root cause of fan stigma is revealed. On this basis, this article proposes ways to eliminate stigmatization, such as strengthening the supervision of online public opinion, guiding fan groups, promoting positive culture, and strengthening constraints on celebrity capital. By implementing these measures, the stigmatization of fans can be effectively reduced, fostering the growth of a wholesome star fandom and contributing to establishing a virtuous fan community and a more civilized society.
Optical satellites are affected by factors such as seasonal and atmospheric variation, illumination, and sensor distortion. Thus, satellite images covering large-scale area often show conspicuous ...color differences, resulting in poor color continuity of the mosaicked satellite image. This study proposes a novel combined model color correction (CMCC) method for high-resolution optical satellite images, which constructively combines a defogging model with a radiation correction model. First, this study analyzed the feasibility of using easily available low-resolution satellite images as external references to correct the color of high-resolution images and describes the selection criteria for external references. Second, considering the negative effects of atmosphere on the color and clarity of remote sensing images, we proposed an optical satellite image enhancement method, which is based on the content characteristics of remote sensing images and the dark channel prior defogging method. Finally, we designed a two-stage color correction process: 1) correcting the color of downsampled images via low-frequency modeling and replacement and 2) mapping the color of downsampled images to original images through local modeling and super-resolution color correction. Furthermore, this study proposes an indicator of quality considered mean absolute error (QCMAE) for quantitative evaluation of the color correction result. We selected 328 Gaofen-1 (GF-1) high-resolution images for the experiments. Visual effects and statistical results of images after being processed by the proposed CMCC are both superior to the three state-of-the-art methods, which verifies the effectiveness and reliability of the proposed method.
Nitrogen is an essential element for sugarcane growth and development and is generally applied in the form of urea often much more than at recommended rates, causing serious soil degradation, ...particularly soil acidification, as well as groundwater and air pollution. In spite of the importance of nitrogen for plant growth, fewer reports are available to understand the application and biological role of N
fixing bacteria to improve N
nutrition in the sugarcane plant.
In this study, a total of 350 different bacterial strains were isolated from rhizospheric soil samples of the sugarcane plants. Out of these, 22 isolates were selected based on plant growth promotion traits, biocontrol, and nitrogenase activity. The presence and activity of the nifH gene and the ability of nitrogen-fixation proved that all 22 selected strains have the ability to fix nitrogen. These strains were used to perform 16S rRNA and rpoB genes for their identification. The resulted amplicons were sequenced and phylogenetic analysis was constructed. Among the screened strains for nitrogen fixation, CY5 (Bacillus megaterium) and CA1 (Bacillus mycoides) were the most prominent. These two strains were examined for functional diversity using Biolog phenotyping, which confirmed the consumption of diverse carbon and nitrogen sources and tolerance to low pH and osmotic stress. The inoculated bacterial strains colonized the sugarcane rhizosphere successfully and were mostly located in root and leaf. The expression of the nifH gene in both sugarcane varieties (GT11 and GXB9) inoculated with CY5 and CA1 was confirmed. The gene expression studies showed enhanced expression of genes of various enzymes such as catalase, phenylalanine-ammonia-lyase, superoxide dismutase, chitinase and glucanase in bacterial-inoculated sugarcane plants.
The results showed that a substantial number of Bacillus isolates have N-fixation and biocontrol property against two sugarcane pathogens Sporisorium scitamineum and Ceratocystis paradoxa. The increased activity of genes controlling free radical metabolism may at least in part accounts for the increased tolerance to pathogens. Nitrogen-fixation was confirmed in sugarcane inoculated with B. megaterium and B. mycoides strains using N-balance and
N
isotope dilution in different plant parts of sugarcane. This is the first report of Bacillus mycoides as a nitrogen-fixing rhizobacterium in sugarcane.
This article proposes improvements to the placement, organizational structure, and adaptability of the evaluation model and proposes a comprehensive evaluation model for the multiattribute scheme of ...the particle swarm optimization algorithm. The structure table of the multimedia building design plan evaluation index, the plan evaluation table, and the standardized model of the plan evaluation value of the common method was proposed. It also proposes the import of “with tutor” type data of particle swarm optimization algorithm as well as the self-organizing neural network evaluation model and calculation method of “no tutor” type resource import. According to the complexity of architectural design evaluation and the nonlinear relationship between related influencing factors, we have studied the principles and methods of applying system analysis, designed comprehensive evaluation models, and comprehensively evaluated architectural design schemes.
The universe can be utilized as a sink for heat pumping by means of passive radiative cooling (PRC). This approach is an age-old cooling practice that has had a renaissance with increasing numbers of ...research papers over the past two decades. This paper reviews the trends of this technique, as well as advancements in recent years, with an attempt being made to analyze the cooling magnitude and developmental prospects for both diurnal and nocturnal periods. The models and calculations for computing the performances of passive radiative cooling systems are discussed along with the designs and fabrication factors that influence a system's performance. Optimizing strategies that maximize the net cooling power are also presented. The various system configurations that are available to date are summarized to demonstrate the building integration forms of PRC systems. The cooling potentials of different systems are assessed by simulations, and it is shown that the daytime cooling energy density is rather modest, even under the most favorable conditions. The barriers that likely exist to widespread application as well as the scopes for further improvements of PRC are also provided. It is noted that the commercialization of PRC systems is primarily limited by coating material constraints and technique reliability. The advent of a new type of material will be a critical solution to the prevalence of PRC.
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