Experimental and optical performances of a solar CPV device using a linear Fresnel reflector concentrator

In order to quantitatively analyze the effect of powder on fiber dispersion, the surface free energy theory was applied to test the surface free energy parameters of each powder based on the “capillary rise method”. Then, the surface free energy of each powder was further calculated. Finally, based on a certain ratio, the fiber reinforced cement was formed. In terms of the test piece, the profile of the cement slurry was imaged through the method of scanning electron microscopy. Through the image, the distribution of the fiber in the profile was quantified, and the relationship between the free energy of the powder surface and the distribution of the fiber in the cement slurry was clarified. It indicates that there is a strong correlation between the dispersibility and the surface energy of the powder. The greater the surface energy of the powder, the higher the distribution coefficient of the fiber in the cement paste.

Section: Test Results Of Uniformity Of Fiber Distribution In Cementmentioning

confidence: 99%

The influences of powder surface energy on the dispersibility technology of polyvinyl alcohol fiber

Zhao

Liang

Zhu³

2020

“…The different spatial distribution of the block stone is investigated, the pores of lime-modified carbonate filling at the soil-structure interface are filled and further tamped, and the particle gradation curve is simulated by the particle discrete element method. 31,32 Neglecting the influence of particle size on the resonance F I G U R E 7 Finite element analysis model of different hammerhead tamping lime-modified carbonate soil port urban road subgrade…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Feasibility of lime‐modified carbonate soil for highway subgrade filling

Zheng¹,

Qingqing³

2020

For the lime modified carbonate rock soil road subgrade of port highway, after the lime modified carbonate rock filler is used to treat it, the particle discrete unit has the characteristics of sparsity, and the particle gradation is caused by the seepage of soil mass, and with the increase in load, overload load occurs. It is therefore necessary to establish relevant mathematical models to analyze the load variation of lime‐modified carbonate roadbed under boundary conditions. The probability mathematical model of the load overload of lime‐modified carbonate fill was studied, and a feasibility analysis model of lime‐modified carbonate soil used in port city highway subgrade filling was put forward based on the discrete hysteretic characteristic curve method. The load characteristics of lime‐modified carbonate soil were analyzed within the limited area distribution range of adjacent two holes. The load energy transfer model of lime‐modified carbonate packing in foundation soil was analyzed in PFC3D software. The foundation stress reinforcement method was used to improve the carbonate soil foundation construction and, combined with the seepage model of the radial consolidation of the foundation, a filling feasibility analysis of the urban highway subgrade of lime‐modified carbonate soil port was carried out. The simulation results show that this method can effectively realize the load overload analysis of lime‐modified carbonate packing, improve the load capacity of subgrade filler for port city highway, and improve the load property of highway subgrade of port city. Keep the soil particles in close contact. This study provides a feasible basis for future highway construction and the application of lime‐modified carbonate.

“…The sample observation values of high informal environmental regulation intensity and low informal environmental regulation intensity were 265 and 245, respectively, covering 51.96% and 48.04% of the total samples. In 2002, the sample observations of both high informal environmental regulation intensity and low informal environmental regulation intensity were 15, and in 2018, the sample observations of high informal environmental regulation intensity and low informal environmental regulation intensity were 17 and 13, respectively 25,26 . This shows that the numbers of provinces in China with high informal environmental regulation intensity and low informal environmental regulation intensity are basically the same.…”

Section: Empirical Analysismentioning

confidence: 89%

Does technological innovation reduce water pollution intensity in the context of informal environmental regulation?

Cao

et al. 2020

In the new era of Chinese economy stepping toward high‐quality development, with the enhancement of the public environmental protection awareness and continuous improvement of technological innovation level, it is of great significance to study how technological innovation reduces water contamination against unofficial environmental regulations, which is also the primary task of construction of ecological civilization. The purpose of this paper is to study the contribution of technological innovation to water pollution intensity at different quantile levels and to test the nonlinear relationship between technological innovation and water pollution emission intensity under informal environmental pollution. On the basis of the provincial panel data of China from 2002 to 2018, the model of quantile and panel threshold was constructed to empirically analyze the structural mutation and threshold effects of technological innovation on the intensity of water pollution in China against the environment of informal environmental regulation. The study found that the marginal effects of technological innovation on the intensity of water pollution in China had undergone structural changes. Under different water pollution intensity, technological innovation can reduce pollution between 0.167% and 0.415%; with informal environmental regulation as the threshold variable, when the intensity of informal environmental regulation is less than the threshold value of 0.2168, technological innovation has a significant inhibitory effect on China's water pollution intensity, and when the intensity of informal environmental regulation exceeds the threshold value, the mitigation effect of technological innovation on China's water pollution intensity is more significant. The inhibition effect of technological innovation on water pollution emission intensity changed from 0.437 to 0.474. Therefore, when formulating environmental pollution policies, local governments should make rational use of informal environmental regulations and technological innovation, improve the informal environmental regulation system, and promote water pollution control with science and technology.