Papers by Keyword: High Performance

Abstract: Among the abundant molecules in nature, one has remained relatively underexplored in the domain of bio-based thermosets. In line with the pursuit of sustainability, we present the successful synthesis of a novel bio-based thermoset monomer (designated as Q-Ph) based on a naturally occurring flavonoid molecule, quercetin (Q). This synthesis involved a nitro displacement reaction with 4-nitrophthalonitrile. Structural confirmation of Q-Ph was achieved using hydrogen and carbon nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy (FTIR), and elemental analysis. Curing characteristics were assessed using differential scanning calorimetry, which indicated lower curing and polymerization temperatures compared to petroleum-based counterparts. Polymerization was further examined via temperature-dependent FTIR. Notably, the synthesized resin displayed superior performance, suggesting an autocatalytic curing mechanism. These findings highlight the potential of the developed phthalonitrile (PN) thermosets as a sustainable alternative to petrochemicals, particularly in high-performance applications.

Abstract: High-performance computing equipment uses graphic processors, known as GPUs, as a mechanism for high computational capacity. To increase the computational capacity, additional graphics processors are added in the configurations. This strategy increases the computational capacity as well as considerably increases the temperature generated by the entire system, normally the GPUs have cooling systems, which help to cool as much as they are required, the operating systems have automatic mechanisms to access the GPUs, these functions are activated when it is required to use them, in the event of a need for high computing capacity requirement. In this work we demonstrate a method to analyze the operation of computing equipment when working on high-performance functions, such as video games, which require high computational capacity to be able to play in real time and perform the tasks. Necessary renderings, the method can be applied to other applications that are necessary to ensure the continued operation of the computing equipment.

Abstract: Carbon-coated hematite α-Fe₂O₃ core-shell structure had been synthesized by a facile method of pulsed high-voltage discharge. The structure, morphology, and phase composition of the material were characterized by SEM, TEM, and XRD methods. When carbon-coated α-Fe₂O₃ was galvanostatically cycled at 100 mA g^–1 in the voltage range of 3.0–0.005 V, it exhibits a reversible capacity of 479 mAh g^–1, assuming about three Li⁺ ions retrieval.

Abstract: The paper presents a two-stepped technique to synthesize the Reduced Graphene Oxide (RGO). RGO is a single layer structure of carbon without presence of oxygen group with high level of conductivity (3.38 × 10⁵ s/m). The synthesized graphene is used on low permittivity substrate to realize high performance RGO microstrip patch antenna. The antenna operates in ultra-wide band frequency range from 2.5 GHz to 12.2 GHz with gains between 5.5dB and 14.5dB. Low profile and small size (90 mm × 45 mm) makes the antenna suitable for integration.

Abstract: A high performance polycarboxylate superplasticizer (PCE) was successfully synthesized by a polymerization reaction among acrylic acid (AA), maleic anhydride (MA) and isopentenyl polyethylene glycol (IPEG) through redox initiation system. The composition and amounts of initiation system, and the ratio of monomers were investigated respectively. The proportion of IPGE: MA: AA: sodium methallyl sulfonate (SMAS): ammonium persulfate (APS): ascorbic acid (ASA) was determined as 1: 3: 1.5: 0.3: 0.015: 0.012. Moreover, the effect of polymerization temperature on PCE’s cement paste fluidity was studied. The results showed that the cement pastes mixed with PCE synthesized at 10°C, 20°C and 30°C respectively exhibited better fluidity performances than that mixed with common PCE. The Fourier Transform Infrared Spectroscopy (FTIR) measurements were used for the structural characterization. The results confirmed the occurrence of polymerization reaction and the ideal structure. Furthermore, the application performances of PCE synthesized through redox initiation system in mortar and concrete were tested. The results showed that the water reducing rate of PCE in mortar and the slump performances of PCE in concrete were better than those of the common commercial PCEs. This synthesis method presents the great research value and application prospect for the PCE preparation in concrete engineering.

Abstract: The paper is to study the use of reconfigurable machines and the computational environments for the synthesis of high quality reconfigurable automatic control systems, constructed on their basis. A key feature of the constructed system is that during establishment of the command variable the exact value of the error signal and its derivatives is not used. However the data regarding their signs are used. Besides the signal of the command variable can only take values from a binary set {0, 1}.

Abstract: The preparation of high performance hydrogels has always been one of the research focuses in the area of soft matters and functional polymers. In this paper, a facile method was developed for the preparation of high performance hydrophobic association nanocomposite hydrogels (HANC gels) via in situ copolymerization of acrylamide (AM) and octadecyl methacrylate (OMA) in the aqueous suspension of hectorite clay Laponite HZ-200 (clay) with sodium dodecyl benzene sulfonate (SDBS). Tensile hysteresis curves showed that the hysteresis degrees between HANC gels and conventional hydrophobic association hydrogels (HA gels) were almost the same, but the tensile strength of the HANC gel reinforced by just 0.4 wt% clay at the strain of 1500% was already as 630% as the strength of the HA gel, which indicated that the mechanical properties of the HA gel were greatly enhanced by the introduction of a small amount of clay without increasing the internal friction in the hydrogel network. The effects of clay on the structure of HANC gels were further confirmed by swelling test, it was found that the addition of clay effectively maintained the structural integrity of HANC gels in watery environment and prevented the collapse of gel network. Moreover, HANC gels exhibited superior cationic dye adsorption capacity compared to HA gels due to the existence of abundant negative charges on the surfaces of clay nanosheets

Abstract: This paper describes a kind of folded cascode amplifier, which not only has high gain, large output swing characteristics, and its outputs can be self-compensation, it has a strong suppression capability with voltage noise. Based on a 0.5μm CMOS process uses two operational amplifiers. Through software emulation corrected the error which was caused by theoretical calculation. Has good performance in gain, noise, swing, phase margin, common mode rejection ratio and other parameters.

Abstract: Charge amplifier is the key component in the pre-processing circuit of the sensors. With the development of the sensor technology, the charge amplifier on the market has not been able to meet the requirement of the actual measurement. In this paper, a LF356-based charge amplifier is suitable for the conversion circuit of the polyvinylidene fluoride (PVDF) piezoelectric sensor, duing to its small volume, low power consumption and strong anti-interference. The fesibility and reliability of the charge amplifier are verified by simulating the circuit with Multisim10 and testing the hardware circuit. This charge amplifier achieves a volume of 19.32 cm³ and a bandwidth between 20kHz and 150kHz at a power consumption of 1 mW. Performance of this charge amplifier is investigated when it is connected to a standrad signal source, achieving a gain of 10 times.

Abstract: Grid computing is a computing model in which computing resources are geographically dispersed. A computing node can share these resources as well as can transfer applications at other nodes to execute it. Due to the absence of centralized authority in grid, some resources may be overloaded and others may be under loaded. To obtain high performance, load balance strategy is necessarily needed. Load balance strategy can be affected by different parameters like network parameters, application characteristics, computing node capacity etc. In this paper, we consider using three parameters namely network parameters, computation node capacity and application characteristic to obtain effective load balance. All these parameters will pass to AHP (Arithmetic hierarchy process) for automatic decision making to select better resources for high performance service.