Dislocation filtering in gallium nitride (GaN) by epitaxial growth through patterned nanoscale holes is studied. GaN grown from extremely high aspect ratio holes by metalorganic chemical vapor deposition is examined by transmission electron microscopy and high-resolution transmission electron microscopy. This selective area epitaxial growth method with a reduced epitaxy area and an increased depth to width ratio of holes leads to effective filtering of dislocations within the hole and improves the quality of GaN significantly.
This paper introduces the method of NC transformation for general injection molding machines and the design of the embedded control system, to apply to low-pressure injection , so as to realize in-mould lamination processing of automotive interiors. According to the characteristics of in-mould lamination processing, the system applies dynamic mold temperature control and sequence control in injection, makes the product high quality, production efficiency, leads the industry to the developing of new technology, and has wide application prospect.
Supplementary Data from <i>RAB37</i> Hypermethylation Regulates Metastasis and Resistance to Docetaxel-Based Induction Chemotherapy in Nasopharyngeal Carcinoma
Despite the fundamental difference in material systems and temporal evolution, self-oscillating growth of silicon nanowires (SiNWs), led by metal droplets, resembles very much natural river meanders in terms of their sinuosity, fractal dimensions, and scaling law. Both of them are driven by the release of higher potential energy stored in the disorder hydrogenated amorphous Si (a-Si:H) matrix or at highlands, tailored by a streamwise flow mechanism and subject to an erodible boundary constraint imposed by the a-Si:H thin film or the soil banks, respectively. Under specific conditions, the cross-droplet/stream velocity difference can be magnified, during the in-plane growth of SiNWs, to stimulate regular swaggering dynamics that produce continuous and smooth SiNW meanders. This interesting phenomenon indicates a rather simple and highly efficient strategy to shape complex elastic channels with only a few control parameters. A kinetic model has been established to explain the underlying mechanism of the self-oscillating meandering growth, which has unique potential to transform rigid SiNW channels into elastic forms for flexible or stretchable electronic applications.
The ion exchange resin method plays an important role in household water treatment because of its high efficiency, high selectivity and renewability. The adsorption kinetics of the removal of Ca 2+ from household water had been investigated in this paper. Pseudo-first-order rate, pseudo-second-order rate, and intraparticle diffusion models were used to describe the adsorption process. The correlation coefficients by both pseudo-second-order rate and intraparticle diffusion models were greater than 0.9809, while those with pseudo-first-order rate model ranged from 0.6521 to 0.9825. It indicated that both liquid film resistance and intraparticle diffusion involved in the process. The adsorption thermodynamics of the removal of Ca 2+ from household water had been investigated as well. The equilibrium data were correlated by both Langmuir and Freundlich models. The correlation coefficients R 2 with Langmuir model were all greater than 0.9832, while those with Freundlich model ranged from 0.7382 to 0.8336. The Langmuir model could fit the experimental data better than the Freundlich model. The thermodynamic parameters such as standard Gibb's free energy ( D G ), enthalpy ( D H ) and entropy ( D S ) were calculated in detail accordingly. This study could provide a theoretical guidance in the application of household water softening.
In order to achieve the comprehensive observation purpose of high-resolution and wide mapping goal, based on the multi-channel synthetic aperture radar (SAR) signal model in the millimeter wave band, the SAR imaging processing process with range multi-channel and azimuth multi-channel is analyzed, and the data of inertial guidance equipment is introduced to achieve parameter calibration for the problem that non-uniform channel reconstruction is easily affected by attitude error. Based on the Ka-band multi-channel SAR airborne flight data, the method is verified. The data processing results show that through two-dimensional multi-channel data processing, the azimuth ambiguity characteristics of SAR images under down-sampling can be effectively improved, and the noise characteristics can be optimized, and the image interpretability can be improved. The research results can provide a reference for the development and application of millimeter-wave multi-channel SAR imaging system.
Rural building energy consumption accounts for 27.8% of the total energy consumption, of which more than one third is used for heating and cooling of buildings. In western countries, low-energy buildings are very common, and efforts are being made to zero energy consumption housing (ZEB). Considering the characteristics of rural houses, there should be enough outdoor activity space. The residential design should fully strive for the possibility of natural ventilation, daylighting, sunshine, and natural energy collection, and reasonably determine the plot ratio, green space rate, spacing, sunshine time, and other indicators. As the number of building floors and building density of new rural houses is lower than those of cities and towns, the choice of main orientation has a greater impact on residential energy conservation. Combined with the climatic conditions, the building environment technology with local characteristics shall be used, and the local materials that are pollution-free, degradable, renewable, durable, and solid shall be used as far as possible to carry out harmless treatment of construction waste and reduce the emission of CO2 and other pollutants. On the premise of ensuring the comfort of new rural housing, the building shape coefficient should not exceed 0.30. At this stage, the most representative technical measures are fence structure energy-saving technology, that is, the wall adopts rock wool, glass wool, polyethylene plastic, and other college thermal insulation materials as well as composite walls to reduce the heat transfer coefficient of the outer wall. Measures such as increasing the number of window glass layers, pasting transparent polyester film on the window, and using low radiation glass can improve the thermal insulation performance of doors and windows. In addition to doors and windows, the roof can also adopt thermal insulation materials or overhead type, gravel insulation type and the inverted type, and other thermal insulation structures, so as to ensure the indoor temperature. There is also energy-saving control technology of energy system, that is, the control technology of heating and air-conditioning system is the key technology for energy-saving transformation of existing heating network system and building system. In the future, green and environment-friendly building materials should be widely used in ecological buildings, including mold proof and antibacterial composite interior wall coatings, small material adhesives, smoke exhaust, desulfurization gypsum, gypsum mineral powder composite cementitious materials, and high-performance waterborne decorative materials. For high-star green buildings, BIM, industrialization, sponge City, structural optimization intelligent control, and other new relevant technologies should be optimized to reduce incremental costs.
Abstract Creation of new fluorophores is important for understanding the structure–property relationship, by which the required optical properties are likely to be attained. Herein, through theory calculation, it is found that furan‐modified thiadiazolo quinoxaline acting as an electron acceptor can endow donor–acceptor–donor (D–A–D) type second near‐infrared (NIR‐II) fluorophores with longer emission wavelength than the other thiadiazolo quinoxaline‐based acceptors containing pyridine, pyrrole, thiophene, and phenyl groups, respectively. On the basis of this theoretical prediction, a D–A–D type NIR‐II fluorophore with 6,7‐di(furan‐2‐yl)‐[1,2,5]thiadiazolo[3,4‐g] quinoxaline (DFTQ) as the acceptor and dithieno[3,2‐b:2′,3′‐d]pyrrole (DTP) as the donor is designed and synthesized, and the aggregation‐induced emission (AIE) function is further achieved by introducing the AIE units of tetraphenylethylene (TPE) and triphenylamine (TPA), respectively, totally forming three NIR‐II fluorophores DFTQ–DTP, DFTQ–DTPE, and DFTQ–DTPA. For biological applications, the fluorophores are encapsulated by amphiphilic DSPE–PEG 2000 to generate water‐dispersible nanoparticles (NPs). Almost the whole emission of each of the NPs falls into the NIR‐II spectral range, with part emission beyond 1300 nm. By using DFTQ–DTPA NPs as the contrast and photothermal therapy (PTT) agent, high‐resolution in vivo fluorescence imaging is achieved in the greater than 1300 nm window, and their good performance in photoacoustic imaging and high tumor PTT efficacy in tumor‐bearing mice are also demonstrated. Taken together, this work mainly provides a strong electron acceptor for constructing long‐emitting fluorophores, and by using the electron acceptor, a AIE fluorophore with desirable quantum yield (QY) and photothermal conversion efficienciy (PCE) is synthesized and demonstrated to be promising in fluorescence/photoacoustic imaging and PTT.
The application of the light-guided environmental control device will greatly increase the quality of life of certain persons with disabilities. This hands-free mechanism will allow the user to perform many daily tasks without the need of an aid. It is an environmental control and a wheelchair control that is driven by a light emitting head switch. One of the main foci of the project is to remove many of the cumbersome control switches being implemented today, and replacing them with one compact model. This product is to perform all operations currently performed by head arrays and switches, as well as standard joysticks. It is being designed to be used primarily by those people without the use of their limbs, especially those looking to gain a great deal of independence.
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