Crystalline mesoporous molecular sieves have long been sought as solid acid catalysts for organic reactions involving large molecules. We synthesized a series of that possess crystalline microporous walls with zeolitelike frameworks, extending the application zeolites to range 2 50 nanometers. Hexagonally ordered or disordered mesopores are generated by surfactant aggregates, whereas multiple cationic moieties in head groups direct crystallization aluminosilicate frameworks. The wall...

In a high-speed operation of vector-controlled induction motor, coupling between d-q current dynamics impairs the characteristics torque response. The feedforward decoupling scheme does not perform well if an error exists in motor parameter estimation. We derive dynamic condition when two additional proportional integral controllers are used. A great advantage this controller is robustness to estimation errors. Further, we observe that overmodulation methods lead violation condition, thereby...

The authors propose a new power converter control scheme for converter-inverter system. strategy is to fully utilize the inverter dynamics in controlling dynamics. obtain both and systems, so that it matches required exactly. Then, ideal case, no flows through DC-link capacitors and, thus, voltage does not fluctuate even though very small amount of capacitance used. In forcing match power, master-slave concept. They level indirectly stored capacitor energy order exploit advantage linear...

This paper addresses a control method of reducing the size DC-link capacitors converter-inverter system. The main idea is to utilize inverter operation status in current converter. Specifically, information on load power incorporated synthesizing converter input so that proper DC voltage level maintained. We describe dynamics and apply feedback linearization theory obtain an output linearized Theoretically, this strategy effective regulating level, even though capacitor arbitrarily small...

Multiammonium surfactants exhibited a remarkable capping effect for zeolite synthesis in the forms of nanoparticles, nanorods, and nanosponges cases where common monovalent failed. A nanorod-shaped mordenite synthesized this manner showed significantly enhanced catalytic lifetimes acid-catalyzed cumene reactions. As service to our authors readers, journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized online delivery, but not...

Zeolite MFI nanosheets have been hydrothermally synthesized using a surfactant with the formula [C18H37–N+(CH3)2–C6H12–N+(CH3)2–C6H12–N+(CH3)2–C18H37][Br−]3 as zeolite structure-directing agent. These correspond to slice of crystal 1.5 nm thickness in b-direction. Each nanosheet is composed monolayer micropores, which thinner than single unit-cell dimension (2.0 nm). Such single-pore still exhibits high thermal stability, steam acid strength and shape-selective catalytic activity, comparable...

Background Consumer sleep trackers (CSTs) have gained significant popularity because they enable individuals to conveniently monitor and analyze their sleep. However, limited studies comprehensively validated the performance of widely used CSTs. Our study therefore investigated popular CSTs based on various biosignals algorithms by assessing agreement with polysomnography. Objective This aimed validate accuracy types through a comparison in-lab Additionally, including conducting multicenter...

Electric vehicle (EV) motors are characterized by their low inductance and high current density, so that they run at speed produce a starting torque. Due to the coil design, ripple caused pulsewidth modulation (PWM) switching makes significant amount of eddy-current loss hysteresis loss, especially in high-speed operation. If one simply neglects iron overall vector controller is detuned, resulting an error torque control. The modeled, general, parallel resistor R/sub M/ magnetizing inductor...

Abstract Resource allocation in a software project is crucial for successful development. Among various types of resources, human resource the most important as development human‐intensive activity. Human very complex owing to characteristics developers. The affecting can be grouped into individual‐level and team‐level characteristics. At individual level, familiarity with tasks needs taken account it affects performance In addition, developers have different levels productivity, depending...

Abstract This paper reports the synthetic route of 3-D network shape α-Fe 2 O 3 from aqueous solutions iron precursor using a non-ionic polymeric soft-template, Pluronic P123. During synthesis , particle sizes, crystal phases and morphologies were significantly influenced by pH, concentrations template. The unique worm-like hematite was obtained only when starting solution prepared weakly basic pH condition very specific composition constituents. synthesized nanocrystal at this had narrow...

A fatigue crack and its precursor often serves as a source of nonlinear mechanism for ultrasonic waves, techniques have been widely studied to detect at very early stage. In this study, wireless sensor node based on ultrasonics is developed specifically detection: (1) through packaged piezoelectric transducers, waves two distinctive frequencies are generated, their modulation due microcrack (less than 0.1 mm in width) detected; (2) an autonomous reference-free detection algorithm embedded...

Purpose: Nocturnal sounds contain numerous information and are easily obtainable by a non-contact manner. Sleep staging using nocturnal recorded from common mobile devices may allow daily at-home sleep tracking. The objective of this study is to introduce an end-to-end (sound-to-sleep stages) deep learning model for sound-based designed work with audio microphone chips, which essential in such as modern smartphones. Patients Methods: Two different datasets were used: data routinely solitary...

The growing public interest and awareness regarding the significance of sleep is driving demand for monitoring at home. In addition to various commercially available wearable nearable devices, sound-based staging via deep learning emerging as a decent alternative their convenience potential accuracy. However, has only been studied using in-laboratory sound data. real-world environments (homes), there abundant background noise, in contrast quiet, controlled such laboratories. use homes not...

In the high-speed operation of a vector controlled induction motor, decoupling current control is very important problem. However, conventional scheme does not perform well when there are mismatches in motor parameters. The authors propose PI type controller. A great advantage this controller its robustness to parameter errors. Hence, proposed appears suitable for practical applications where exact parameters unknown. Through simulation results, show that achieves desired performances.

With the explosive increase in wireless devices, physical-layer signal analysis has become critically beneficial across distinctive domains including interference minimization network planning, security and privacy (e.g., drone spycam detection), mobile health with remote sensing. While SDR is known to be highly effective realizing such services, they are rarely deployed or used by end-users due costly hardware ~1K USD USRP). Low-cost SDRs RTL-SDR) available, but their bandwidth limited 2-3...

Internet of things (IoT) technologies have been widely used in various applications, especially industrial field, which often require energy efficiency, high reliability, and low delay. Recently, Time Slotted Channel Hopping (TSCH) that operates based on TDMA with channel hopping has standardized to achieve such multiple goals. Based TSCH protocol, the nodes are scheduled at slots by scheduling algorithm, where there is a trade-off between efficiency contention among senders. In this paper,...

The synthesis of a micro-mesoporous EUO zeolite with significant volume intercrystalline mesoporosity revealed an outstanding result in the challenging industrial hydroisomerization ethylbenzene.

We propose a new MAC protocol for IoT applications, called Bird-MAC, which is highly energy efficient in the applications where sensors report monitoring status quasi-periodic manner, as structural health and static environmental monitoring. Two key design ideas of Bird-MAC are: (a) no need early-wake-up transmitters (b) taking right balance between synchronization coordination costs. The idea possible by allowing node (whether it transmitter or receiver) to wake up just with its given...

Multi-user MIMO (MU-MIMO) is a widely-known, fundamental technique to significantly improve the spectrum efficiency. While there great demand for efficiency and massive scalability under explosively increasing IoT, hardware limitations make it particularly challenging mechanism be transferred IoT (e.g., ZigBee) domain. This paper presents X-MIMO, zero-cost, software-only cross-technology MU-MIMO commodity ZigBee. As first work shed light on feasibility of X-MIMO leverages communication (CTC)...

We propose a new converter control scheme for converter-inverter system. The strategy is to fully utilize the inverter dynamics in controlling dynamics. obtain power both and systems, so that it matches required exactly. Then, ideal case, no flows through DC-link capacitors, thus voltage does not fluctuate even though very small amount of capacitance used. In forcing match power, we master/slave concept. level indirectly stored capacitor energy order exploit advantage linear dynamic behavior...