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Because of excellent electrical properties, epoxy resin is widely used in packaging and casting power equipment. Moisture and temperature in the environment are inclined to seriously affect the insulation tolerance of epoxy resin. This work focuses on the aging characteristics of epoxy resin in hygrothermal environment. The effect of hygrothermal aging on the properties of epoxy resin was deeply studied...
Lanthanum hexaboride (LaB6) nanowires have attracted much attention due to their outstanding physical properties. In order to enhance the developments of LaB6 nanowires, it is essential to study the field emission (FE) properties of LaB6 nanowires in different environments. Here, we investigate the effect of oxygen (O2) on the FE behaviors of LaB6 nanowires. And it is found that the oxygen content...
Since mechanical chillers account for a large fraction of electricity spent on cooling, data centers are looking for ways to reduce their usage. In High Performance Computing, a popular approach is to use readily available high temperature direct liquid cooling (HT-DLC) that allows for mechanical chiller free cooling of compute components. Additionally, it provides a means to re-use their waste heat...
In this work, we demonstrate the use of laser THz emission microscopy (LTEM) in evaluating the binding energy of locally adsorbed O2 molecules on 2D materials. The THz waveform can be correlated with the local O2 adsorbate concentration as a function of temperature, allowing the use of LTEM for temperature programmed desorption measurements.
SF6 insulated electric power equipment is usually equipped with adsorbents to control the humidity and contents of decomposition products, which will affects the accuracy of monitoring results obtained by analyzing the decomposition compound. In this paper, adsorption efficiency of three frequently-used molecular sieves, including 4A, 5A and KDHF-03, were comparatively studied. The adsorption kinetics...
In this paper, we report first molecular beam study of CO oxidation on a regular array of Pd clusters on alumina. The constant distance with neighbour particles allows to overcome uncertainties in some parameter in the reaction, in comparison of other studies where particles have been grown or deposited on substrates that leads to random distribution. Furthermore, growing such array of particles by...
The objective of the present work was to test a new prototype cooling adsorption machine with silicagel / water under laboratory conditions in order to verify the feasibility and the progress of different processes of the adsorption refrigeration cycle. The system proposed in this study consisted of a tubular adsorbent bed, a condenser, and an evaporator. The working operation parameters of the cooling...
To measure space charge density around UHVDC transmission lines, a measuring device is developed based on air filtration methods. The device, which uses STM32 microcontroller as the core controller, collects charged particles in the air by adsorption material. Through the charge to voltage converting circuit, charges absorbed are transferred into a voltage signal and are collected by microcontroller...
We report experimental investigation of resonant responses of molybdenum disulfide (MoS2) nanomechanical resonators at different temperatures. We observe strong temperature hysteresis in measurements. By examining devices with different geometries under different air pressures, we determine that surface adsorption plays an important role in the observed temperature hysteresis. This opens new possibilities...
The electron work function of the ternary alloys K-Cs-Rb has been studied by means of the photoelectric Fowler method in conditions of the ultra-high vacuum. The electron work function polytherms can be described by the linear equations except for the alloy 72.7 at.% Na + 1.3 at.% Cs + 26.0 at.% Rb for which the shape of the temperature dependence of the electron work function slightly changes between...
Silicene, the silicon analogy of graphene, has attracted tremendous attention. Also the formation of alloys that exist only in a confined region near the surface of materials has important technological implications. In this work, we study the structural transition for silicon adsorption on Ag(111) to form a highly ordered 2-D structure and to observe the alloy formation of Si-Ag as an example of...
This paper presents a model of the electrical transport in MIS structure of metal — thin nanoporous silicon-p-Si. The obtained analytical expressions allow analyzing the contribution of the porous silicon and surface electronic states to the electrical behavior of the structure at gas adsorption. The parameters of surface electronic states for different porous silicon thickness are obtained from analysis...
A Nnao adsorption solar power cooling generator unit is design, built, and operated under the climate of Mutah University. The adsorption solar power consists of the generator, condenser, vacuum pump, and evaporator (cold chamber). The activated carbon methanol is set as adsorption pair. The thermal impact of the modified paints on the collector performance by adding certain nano-materials to the...
The treatment of chromium containing wastewater using flyash and modified flyash as adsorbents was studied. The effects of time, pH, the dosage of absorbents, initial concentration on the removal of Cr (VI) in wastewater were discussed. The results showed that the modified flyash has a better efficiency on the removal of Cr (VI). The removal rate of Cr (VI) is 97.52% under the conditions of the pH=1...
The treatment of chromium containing wastewater using chitosan and the modified chitosan as adsorbents was studied. Various factors including solution pH, the dosage of absorbents and initial Cr (VI) concentrations were taken into account and promising results obtained. The results showed that the modified chitosan have a better efficiency on the removal of Cr (VI).an initial solution PH of 1.0 was...
Bio-sorption of Pb2+ ion from wastewater with Chlorella was investigated in the batch mode. The influence of pH of the solution, biosorbents dose, concentration of ions and contact time on bio-sorption capacity of Pb2+ ions was studied. The studies revealed that Pb2+ ions uptake rate was rather slow, with 75% of the total amount occurring in the first 10min for Chlorella. The optimum pH for bio-sorption...
The adsorption of reactants over the commerciallized SCR catalyst surface was investigated by EPR, as well as the influence of H2O and SO2. The results showed that the V4+ over the catalyst could be oxidized under NO + O2 atmosphere, and NH3 was adsorbed on Brönsted acid sites. The amounts of V4+ and super oxide ions were promoted at the presence of H2O and SO2 after adsorption. However, the intensity...
ZnO single nanowire photodetectors have been measured in different ambient conditions in order to understand and control adsorption processes on the surface. A decrease in the conductivity has been observed as a function of time when the nanowires are exposed to air, due to adsorbed O2/H2O species at the nanowire surface. In order to have a device with stable characteristics in time, thermal desorption...
Composite absorbent (CAds-AC-15) mainly used activated carbon and CaCl2 as the resources for adsorption refrigeration were prepared by the mixed method, and the content of activated carbon in CAds-AC-15 was 15%. Adsorption isotherms of ammonia on CAds-AC-15 were determined by positive gravimetric method. Adsorption desorption cycle performance and cooling characteristics of CAds-AC-15- ammonia working...
A micro gas preconcentrator which has a single walled carbon nanotube (SWNT) film as a sorbent material was fabricated by MEMS technology. This work is the first to investigate the performance of SWNTs in the preconcentrator by evaluating their adsorption capacity. Octane adsorption experiments were carried out for 60 minutes on the newly fabricated preconcentrator and the concentration factor was...
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