Sustainable Performance Analysis of Power Supply Chain System from the Perspective of Technology and Management

The power industry is an important strategic industry that has effectively advanced the rapid development of China’s economy. However, this rapid development has created significant environmental problems and does not support the sustainable development of the ecological environment and economy. This study evaluated and analyzed the sustainable performance of China’s inter-provincial power supply chain systems (PSCSs), and developed policy recommendations for further developing China’s power industry based on the research results. For PSCSs with internal subsystems, this study first developed a non-radial two-stage model, and proposed steps to solve the model; then, this study applied the proposed model to empirically analyze China’s inter-provincial PSCSs. The empirical analysis yielded the following key research findings. Firstly, for the study period, China’s power industry had a low overall performance, and PSCS performance varied significantly across different regions. Secondly, the average meta-frontier efficiency (ME) of PSCSs in high-income regions was the highest; the average ME of PSCSs in middle-income regions was the lowest. This is consistent with the environmental Kuznets curve hypothesis. Thirdly, this study found that the PSCSs had effective management and technical systems in Qinghai and Guangdong. The PSCSs in other regions need improvements to mitigate either inadequate management, inadequate technology, or both

Investigation on data processing method in multi antenna GPS system designed for landslide

Globalni pozicionirajući sustav (GPS) je satelitski navigacijski sustav u kružnoj putanji srednje udaljenosti. Osigurava točno pozicioniranje, ispitivanje brzine i vrlo precizno vrijeme u većini dijelova zemljine površine. Položaj je moguće brzo odrediti sa samo 3 satelita, ali ako želimo točniju lokaciju, potrebno je spojiti više satelita. Uobičajena GPS metoda praćenja deformacija sastoji se u postavljanju GPS prijemnika u svakoj kontrolnoj točki. Kad ima mnogo kontrolnih točki, trošak kontrolnog sustava bit će također prilično visok. Za rješavanje ovog problema predlaže se GPS kontrolni sustav s više antena. Višestruke antene su povezane s prijemnikom preko dodatnog prekidača GPS signala. Tako će podaci prikupljeni u sustav biti mnogo veći nego pomoću uobičajenog GPS sustava. Veliki je problem kako učinkovito obraditi veliku količinu podataka. Bit je ovoga rada proučiti metodu obrade podataka za GPS s više antena. Istražuje se metoda sabijanja podataka u GPS sustavu s više antena za brzo uzimanje uzoraka. U metodi se koristi učinkovita količina podataka za dobivanje korisnih informacija. GPS podaci se kodiraju višestrukim metodama kodiranja. Provjera rezultata pokazala je valjanost metode za komprimiranje GPS podatakaThe global positioning system (GPS) is a satellite navigation system in the middle distance circular orbit. It can provide accurate positioning, speed testing, and high precision time standard in most parts of the earth\u27s surface. Position can be quickly determined with only 3 satellites, but if want more accurate location, more satellites should be coupled. The conventional GPS monitoring method for deformation is that the GPS receiver is installed in each monitoring point. When there are many monitoring points, cost of the monitoring system will be quite high. In order to solve this problem, multi antenna GPS monitoring system has been proposed. Multiple antennas are connected to a receiver according to an additional GPS signal switch. So the data obtained in the system will be much larger than by the conventional GPS system. How to effectively process the large amount of data is a difficult problem. In this paper, the main content is to study the data processing method for a multi antenna GPS. Data compression method in a multi antenna GPS system with a high sampling rate is investigated. Data effective degree is used in the method to extract useful information. GPS data is coded by multi coding methods. According to the verification, the results show that the method is valid, and it can be used in the GPS data compression

Differences of Pore Features in Marine Shales between Lower Cambrian and Lower Silurian Formations of Upper Yangtze Area, South China

Lower Cambrian shale and lower Silurian shale are both typical of oil-prone kerogen and siliceous composition, but different in thermal maturities. Porosity differences were determined in marine shales between the two shales. Measurements were utilized including organic geochemistry, XRD, scanning electron microscopy (SEM) and N2 gas adsorption. Pore volume (PV) of lower Silurian shale was approximately 1.5 times higher than that of lower Cambrian shale, and pore surface area (PSA) of lower Silurian shale was almost 2.5 times higher than that of lower Cambrian shale. Lower Cambrian shale and lower Silurian shale possess similar materials, but distinctive thermal degrees. Evolution mechanisms of different types of pores, especially organic matter (OM)-hosted pores, may trigger this different pore features. Pores of rigid framework are the residue of primary interparticle pores during the burial history. Pores associated with clay flakes can be preserved well adjacent to rigid grains or secondary minerals acting as rigid frameworks or grain supporters. Dissolved pores in both lower Cambrian shale and lower Silurian shale barely contribute to the total porosity and mean little to the permeability. Both excessive OM content and over thermal maturity are detrimental to development of OM-hosted pores. Rigid particles, clay flakes, and OM commonly co-exist within shale matrix. Rigid grains act as supporters, clay flakes confine ample space, and OM first migrates into and provides secondary OM-hosted pores. In this condition, pores can be preserved owing to associating matrix with good mechanic and chemical stability. The significant differences of structural settings result into various hydrocarbon explosion efficiency and different pressure circumstance, which consequently leads to the different pore features between the two shales. For lower Cambrian shale, overpressure circumstance diminish if hydrocarbon expels outside of the shale system, and OM-hosted pores destroy through compaction. Sustaining overpressure and abundant residue hydrocarbon (migrated OM) make positive contributions to the pore properties, in terms of numbers, diameters and connectivity of the lower Silurian shale samples

A volumetric change detection framework using UAV oblique photogrammetry – a case study of ultra-high-resolution monitoring of progressive building collapse

In this paper, we present a case study that performs an unmanned aerial vehicle (UAV) based fine-scale 3D change detection and monitoring of progressive collapse performance of a building during a demolition event. Multi-temporal oblique photogrammetry images are collected with 3D point clouds generated at different stages of the demolition. The geometric accuracy of the generated point clouds has been evaluated against both airborne and terrestrial LiDAR point clouds, achieving an average distance of 12 cm and 16 cm for roof and façade respectively. We propose a hierarchical volumetric change detection framework that unifies multi-temporal UAV images for pose estimation (free of ground control points), reconstruction, and a coarse-to-fine 3D density change analysis. This work has provided a solution capable of addressing change detection on full 3D time-series datasets where dramatic scene content changes are presented progressively. Our change detection results on the building demolition event have been evaluated against the manually marked ground-truth changes and have achieved an F-1 score varying from 0.78 to 0.92, with consistently high precision (0.92–0.99). Volumetric changes through the demolition progress are derived from change detection and have been shown to favorably reflect the qualitative and quantitative building demolition progression