Chlorinated polyvinyl chloride (CPVC) pipes are used more and more widely as protective conduits in the field of power cables. According to the application characteristics in the field of cables, there are special requirements for the performance parameters of CPVC pipes. In this paper, several key performance parameters such as CPVC pipe size inspection, ring stiffness, longitudinal retraction rate, vicat softening temperature, density and flattening test are selected, and the theoretical research of the test method is carried out. On the basis of theoretical research, the difference between the dimensional inspection, the ring stiffness, the longitudinal retraction rate, the density and the vicat softening temperature parameters of the unqualified sample and the qualified sample are compared. It is found that the unqualified samples of the flattening test have relatively poor compressive performance, and the longitudinal plasticity stability under the influence of the heat source is also relatively poor. Moreover, when the sample size is unqualified, it directly affects the compressive performance of the sample. Through the research results, it provides the necessary reference for the application of CPVC pipes in the field of power cables.

The landslide susceptibility prediction(LSP) is of great importance to the prevention and control of regional landslide geology disasters. Taking Ningdu County of Jiangxi province as an case, this study obtains a total of 297 landslide locations in the study area and selects ten conditioning factors (elevation, slope aspect, slope, profile curvature, plan curvature, topographic relief, distance to rivers, lithology, NDVI, NDBI). The information value model(IVM) is used to predict the landslide susceptibility and the receiver operating characteristic curve (ROC) is adopted to evaluate the prediction accuracy of IVM. The result shows that the area under ROC (AUC) value of IVM is 0.838. It can be seen that IVM has a good prediction accuracy and also obtains a reasonable distribution characteristics of landslide susceptibility.

With the large-scale penetration of renewable energy, the safe and stable operation of power grid and economic dispatch are facing great challenges. How to realize accurate perception of internal load characteristics of power users is an important technical difficulty to support power demand side management. For this reason, this article is based on extensive IOT technology in electricity, and a non-invasive power load monitoring method (NILM) based on cloud edge collaboration is proposed. Through the two-level architecture of "edge identification" and "cloud correction", the method effectively overcomes the contradiction between the weak computing capability of edge terminal and the heavy communication pressure of cloud master station. The experimental results show that the method can effectively improve the accuracy and reliability of traditional NILM method by considering the influence of external factors.

Ultra-high-performance concrete (UHPC) is expected to provide solutions for the development of lightweight, high-strength, and rapid construction of concrete bridges due to its excellent material properties. In order to study the influence of steel fiber on the bending performance of non-reinforced UHPC (NR-UHPC) slabs, the bending failure test of 8 NR-UHPC slabs was completed with the steel fiber content as a parameter, and the failure mode, load-deflection, crack widths and load-strain curves of the test slabs were analyzed. The test results show that the destruction process of the NR-UHPC slabs can be divided into three stages: elastic stage, cracking stage and failure stage. The load-deflection curve and load-strain curve of the specimen with steel fiber content of 0.5%-1% change linearly during the elastic phase. In the elastic phase, the load-deflection curve and the load-strain curve of the test piece with a steel fiber content of 2%-3% were not smooth after the linearity begins; the strain of the UHPC slab was almost the same within 0-10 kN. However, as the load increased, the larger the amount of steel fiber was, the smaller the strain was, that is, the UHPC slab had good crack resistance. According to the regression analysis of test results at home and abroad, recommended design formulas for the bending bearing capacity of NR-UHPC slab were put forward, which tally well with the test results.

The article presents information on the possibility of applying additive based on amorphous silicates in the lime dry construction mixtures. The methods of synthesis additive on the basis of amorphous aluminosilicates are investigated. Using the method of mathematical planning of the experiment, the optimal mode of synthesis additive was chosen. The compressive strength of lime samples with an additive based on amorphous aluminosilicates obtained at different synthesis times and the ratio of the solid and liquid phases is calculated. The studies and calculations show the effectiveness of the use of amorphous aluminosilicates in lime composites as a structure-forming additive. The lime mixture with the use of amorphous aluminosilicates is characterized by good workability and a high value of compressive strength equal to 2.4 MPa.

Hydrocarbon accumulates in multiple layers of the high, middle and low parts of Chengbei fault zone, in vicinity of Qikou Sag and Qinan Subsag, which represents a breakthrough for large-scale hydrocarbon exploration in recent years. Based on the size, abundance, and attitute of hydrocarbon inclusions, as well as their microscopic polarization and fluorescence characteristics, the hydrocarbon occurrence and the charging difference in the high, middle and low faulted terraces were analyzed systematically in this paper. There are two types of occurrence in the intergranular pores and fractures in the reservoirs, namely, the medium to light oil that shows green fluorescent light, and the solid bitumen charged with a certain amount of hydrocarbon that does not show any fluorescent light. This indicates that the zone has experienced at least two stages of hydrocarbon migration and accumulation, and that diversified forms of hydrocarbon exist in the reservoirs of the zone. The characteristics of hydrocarbon inclusions show that two stages of inclusions were found in the tectonic positions of different faulted terrace. The first-stage inclusions were developed in the early secondary enlargement of quartz grains, with a low degree of development abundance; while the second-stage inclusions were developed after the secondary enlargement of quartz grains, with a high degree of development abundance. The second-stage hydrocarbon inclusions of the reservoir samples obtained at tectonic positions of the high, middle and low fault terrace represent the main filling stage of the present-day reservoirs. Their fluorescence characteristics demonstrate the oil charging difference, which is the maturity of the hydrocarbon decreases as the terraces lift up along the slope. Identifying the hydrocarbon occurrence and charging differences from the perspective of inclusions is conducive to recognizing the regularity of hydrocarbon charging and migration and the distribution patterns in fault terrace zones, and lay the foundation for hydrocarbon exploration of slopes in the future.