Cost and Benefit Analysis of Desulfurization System in Power Plant

The economy of desulfurization system is of great significance for operation of desulfurization system and improving the environment quality in power plant. Based on the desulfurization power price policy, this paper analyzes the cost and benefit structure of the wet flue gas desulfurization system in Chinese power plant; that puts forward the calculation methods of total cost present value, total benefits present value and net present value during the life period of desulphurization system. Moreover using Cost-benefit sensitivity analysis to find out that there is sensitivity relationship between power generation hour and desulphurizer price. By applies these methods, the result shows that the economy of desulfurization system is better under the current designed scheme. But with the reduced power hour and risen price of limestone, the current desulfurization system power price policy of China cannot compensate the running cost of the desulfurization system in power plant rationally, and leads to lower economy of desulfurization system

Effect of the changed electrolytic cell on the current efficiency in FFC Cambridge process

Low current efficiency of the FFC Cambridge process made it no obvious advantages in cost compared with the traditional process to produce metals. Effect of the changed electrolysis cell on the current efficiency has been studied. Put the cathode into an alumina tube with a hole can efficiently avoid short circuit and the cathode contaminated by carbon produced from graphite anode. The results show that the current efficiency can be improved greatly by reducing the electric field intensity in the electrolysis cell. The high background current is mainly caused by the electronic conductivity in the electrolysis cell. Otherwise, pollution of the cathode is avoided, the depletion of the anode sharply decreases and the deoxidation of the samples greatly improve when using the improvement electrolysis cell

Correlates of Mental Health After COVID-19 Bereavement in Mainland China

Context: Pioneering empirical studies show that people bereaved due to COVID-19 experience elevated acute grief, posttraumatic stress, anxiety, and depressive symptom levels, which relate to functional impairment. However, studies focused on Western samples and multivariate analyses of relations between potential risk factors and mental health in this population are lacking. Objectives: To assess the mental health of Chinese adults bereaved due to COVID-19. To elucidate the associations of demographic and loss-related characteristics with mental health after COVID-19 bereavement. Methods: Four hundred twenty-two Chinese adults (56% male; Mean age: 32.73 years) recently bereaved due to COVID-19 completed an online survey. Demographic and loss-related characteristics and prolonged grief, posttraumatic stress, anxiety, and depressive symptoms were assessed. Results: Clinically relevant prolonged grief (49%, n = 207), posttraumatic stress (22%, n = 92), depressive (70%; n = 294), and anxiety symptoms (65%; n = 272) were reported by a substantial group of participants. In four multiple regressions predicting each mental health indicator, Fs(15,406) = 5.08–7.74, Ps < 0.001, loss-characteristics (i.e., a shorter time since loss, βs = -.12–.11, loss of a first-degree relative, βs = .18-.37) and subjective loss experiences (i.e., feeling traumatized by the loss, βs = .13-.18, or a close and/or conflictual relation with the deceased, βs = .12-.23) related most consistently to mental health problems. Conclusion: Many Chinese adults bereaved due to COVID-19 experience severe mental health problems. The recent loss of first-degree relatives, feeling traumatized by the loss, and having a close and/or conflictual relationship with the deceased may elevate risk for these mental health problems, which could require indicated psychological treatment

Exact forced torsional vibration solution of a shaft with multiple discontinuities and arbitrary boundary conditions

In this paper, the method based on Laplace transform and Fourier transform and their inverse transforms is developed to give an exact solution to the forced torsional vibration of a shaft subjected to multiple inertias, multiple elastic supports, arbitrary boundary conditions and arbitrary excitation forces. Two simple cases are used to show in detail how this developed method can obtain an exact analytical solution to the forced torsional vibration of shaft and the results are compared with Eigenfunction Expansion Method and Finite Element Method (FEM) to demonstrate the accuracy and effectiveness of the developed method. Two more complex cases are investigated to further show the superiority of the developed method over FEM in highly efficient and accurate. Finally, using the developed method, the effects of parameters on forced torsional vibration response of shaft are discussed, including the stiffness, the location of elastic supports and the time interval of impact loading. The developed method can provide a reliable theoretical base not only for analysis and fault diagnosis of a shaft system in engineering signal testing projects but also for the verification of other numerical and analytical methods

Synthesis of TiC nanotube arrays and their excellent supercapacitor performance

Nanostructured metal carbides have numerous applications in catalysis and energy storage. However, directional construction remains a significant challenge. In this work, a novel strategy for the direct synthesis of nanostructured metal carbides using nanostructured metal oxides as the precursor is developed. TiO2 nanotube arrays (TiO2 NTAs) can be successfully transformed into TiC nanotube arrays (TiC NTAs) through electro-deoxidation and carbonization reactions in a low-temperature molten salt. TiC NTAs have a highly oriented and ordered array structure, which shows the advantages of large specific surface area, direct electron transport, and good chemical stability. Here, TiC NTA electrodes and PVA-H3PO4 electrolyte gel were assembled into a flexible quasi-solid-state supercapacitor to characterize their energy storage performance. The results show that the TiC NTA electrodes exhibit a high areal capacitance of 53.3 mF cm−2, excellent cycling stability, and mechanical flexibility. Moreover, the energy densities can reach 4.6 μW h cm−2 at a power density of 78.9 μW cm−2. This work provides a new strategy for the directed synthesis of nanostructured metal carbides and demonstrates the energy storage application potential of TiC NTAs. It is expected that this work will contribute to the development of the synthesis and application of nanostructured metal carbides

Improving Sea Transport Efficiency through Simulations

This paper seeks to improve traffic management through simulations so as to get the highesttransport efficiency in a given area. The simulation used in this paper is a dynamic mass simulation.Due to a large data set, various simplified methods are used in organizing the environmentaldata. Vessels are generated according to given distribution and then move alongdesignated routes. When a vessel moves along a route and meets some an abnormal situationthrough the detection of nearby vessels, it will adopt certain measures automatically accordingto the model. So the influence of traffic turbulence can be simulated and this makes the simulationmore realistic. Based on this simulation method, several adjustable parameters, and thesailing rules, the best traffic management measures can be obtained, and the transport efficiencyin a given area can be globally improved