scholarly journals A Study The Effect Of Coating Polystyrene, Znpc, And Annealing Process On The Resonant Frequency Of Quartz Crystal Microbalance

2021 ◽  
Vol 5 (1) ◽  
pp. 68-76
Author(s):  
Fifin Tresna Juwita ◽  
Fadli Robiandi ◽  
Masruroh Masruroh ◽  
Setyawan P. Sakti ◽  
D.J. D.H Djoko
Keyword(s):  
Resonant Frequency ◽  
Quartz Crystal ◽  
Deposition Time ◽  
Frequency Measurement ◽  
Annealing Process ◽  
Coating Process ◽  
Functional Material ◽  
Improve Performance ◽  
Damping Effect ◽  
Before And After

The performance, sensitivity, and corrosion protection on the QCM sensor requirement be improved to maximize the value. Therefore, the functional material coating was carried out. The addition of the polystyrene and ZnPc deposited using the vacuum evaporation method. This study intends to the morphology structure and effect of the coating, to improve performance through the annealing process based on the impedance value at QCM. The frequency measurement before and after the coating process was carried out with a variation of the deposition time, which is 1 minute 30 seconds, 1 minute 45 second, 2 minutes, 2 minute 20 seconds, and 4 minutes. The coating and annealing resulted from the surface structure of the QCM sensor are smooth, small porous, and homogeneous. In addition, the impedance to frequency graph indicates a low damping effect means the QCM sensor does not respond viscoelasticity.

Nano-Crystalline Diamond Films Deposited on Copper Substrate by MPCVD Method

2011 ◽  
Vol 117-119 ◽  
pp. 1310-1314
Author(s):  
Xing Rui Li ◽  
Xin Wei Shi ◽  
Ning Yao ◽  
Xin Chang Wang
Keyword(s):  
Diamond Film ◽  
Deposition Time ◽  
Microwave Plasma ◽  
Copper Substrate ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Annealing Process ◽  
Adhesive Properties ◽  
Plasma Chemical Vapor Deposition ◽  
Nano Crystalline

Nano-crystalline diamond (NCD) films with good adhesion were deposited on flexible copper substrate with Ni interlayer by Microwave Plasma Chemical Vapor Deposition (MPCVD). In this paper, two-stage method was used to improve the adhesion between the copper substrates and the diamond films. The effect of deposition time of the first stage on the morphology, crystal structure, non-diamond phase and adhesive properties of diamond films was investigated. The performance and structure of the diamond films were studied by Scanning Electron Microscope (SEM), Raman Spectroscopy (Raman) and X-Ray Diffraction (XRD). The results showed that the films were nano-crystalline diamond films positively. Impress method was used to examine the adhesion between diamond film and the substrate. When deposition time is 1.5h, the adhesion between diamond film and the copper substrate is better than the others. When it was 2.5h or longer, because the graphite layers existed as intermediate, the adherence between the diamond films and copper substrates was very poor. Therefore, the diamond films were easily peeled off from the substrates. Otherwise, the second stage called annealing process after the deposition played an important role to the adhesion. The films would be easily peeled off by curling without the annealing process.

scholarly journals Mutual Coupling Reduction in Patch Antenna Array Based on EBG Structure for MIMO Applications

2019 ◽  
Vol 63 (4) ◽  
pp. 332-342 ◽  
Author(s):  
Yahiea Alnaiemy ◽  
Taha A. Elwi ◽  
Lajos Nagy
Keyword(s):  
Resonant Frequency ◽  
Antenna Array ◽  
Mutual Coupling ◽  
Multiple Input Multiple Output ◽  
Microstrip Antennas ◽  
Separation Distance ◽  
Rectangular Slot ◽  
Antenna Performance ◽  
Before And After ◽  
Input Multiple Output

This paper presents a printed rectangular slot microstrip antenna array of two elements based on an Electromagnetic Band Gap (EBG) structure. The proposed EBG structure is invented to improve the isolation between the radiating elements for multiple-input multiple-output (MIMO) application. Single and two slotted rectangular microstrip antennas are designed on an FR-4 substrate with a dielectric constant (εr) of 4.3 and loss tangent (tanδ) of 0.025 with thickness of 1.6 mm. The proposed EBG structure is designed as one planar row of 24 slots. The proposed array performance is tested numerically using Computer Simulation Technology Microwave Studio (CSTMW) of Finite Integration Technique (FIT) formulations. The antenna performance in terms of reflection coefficient (S11), isolation coefficient (S21), radiation patterns, boresight gain and Envelope Correlation Coefficient (ECC) are investigated before and after introducing the EBG structure to identify the significant enhancements. The proposed EBG structure is located between the radiating antenna elements to reduce the mutual coupling of the proposed antenna array. The edge to edge separation distance of the proposed antennas is λ0/16, where the λ0 is the free space wavelength at 2.45 GHz. The simulated results show a significant isolation enhancement from –6 dB to –29 dB at the first resonant frequency 2.45 GHz and from –10 dB to –25 dB at the second resonant frequency 5.8 GHz after introducing the EBG structure to the antenna array.

scholarly journals VIII. The crystalline structure of metals. (second paper.)

1901 ◽  
Vol 195 (262-273) ◽  
pp. 279-301 ◽  
Keyword(s):  
Crystalline Structure ◽  
Critical Points ◽  
Annealing Process ◽  
Short Exposure ◽  
Iron And Steel ◽  
Prolonged Annealing ◽  
Suitable Temperature ◽  
Before And After ◽  
Rate Of Cooling ◽  
Crystalline Pattern

The investigations described in the present paper deal principally with the phenomena of annealing. They form a continuation of the research described in the Bakerian Lecture for 1899 (‘Phil. Trans.,’A, vol. 193, 1900, pp. 353-377). In iron, steel, and brass these phenomena have been studied with the aid of the microscope by various workers, among whom Arnold, Charpy, Stead, and Roberts-Austen should be particularly mentioned. As a result of their labours it is well known that annealing is accompanied by a re-arrangement of the crystalline grains of the metal. Thus, when a piece of iron is strained in tension its crystalline grains become elongated in the direction of tension ; but when the specimen has been subsequently annealed by being heated to a bright red, all signs of such elongation disappear from the crystalline pattern revealed by the microscope. In fact it is not generally possible to find any definite connection between the crystalline pattern seen in the same specimen before and after annealing. In general, the pattern seen after annealing resembles that found in a similar specimen before it has been strained, but the scale and character of the pattern produced depend very much on the details of the annealing process, particularly upon the temperature applied, the time of its application, and the rate of cooling. Arnold and Stead have shown that prolonged annealing tends to produce large crystals in iron and steel. But even short exposure to a suitable temperature is well known to produce complete re­crystallisation, and it has been suggested that these changes occur at critical points corresponding to the “arrest-points” in the cooling of the metal. These arrest-points indicate evolutions of heat, and it is natural to suppose that they are evi­dences of re-arrangement of the structure of the metal.

Keyframe-Based Vehicle Surveillance Video Retrieval

2018 ◽  
Vol 10 (4) ◽  
pp. 52-61
Author(s):  
Xiaoxi Liu ◽  
Ju Liu ◽  
Lingchen Gu ◽  
Yannan Ren
Keyword(s):  
Video Retrieval ◽  
Public Security ◽  
Video Content ◽  
Surveillance Video ◽  
Forensic Evidence ◽  
Improve Performance ◽  
Retrieval Method ◽  
Deep Feature ◽  
Before And After ◽  
Short Video

This article describes how due to the diversification of electronic equipment in public security forensics, vehicle surveillance video as a burgeoning way attracts us attention. The vehicle surveillance videos contain useful evidence, and video retrieval can help us find evidence contained in them. In order to get the evidence videos accurately and effectively, a convolution neural network (CNN) is widely applied to improve performance in surveillance video retrieval. In this article, it is proposed that a vehicle surveillance video retrieval method with deep feature derived from CNN and with iterative quantization (ITQ) encoding, when given any frame of a video, it can generate a short video which can be applied to public security forensics. Experiments show that the retrieved video can describe the video content before and after entering the keyframe directly and efficiently, and the final short video for an accident scene in the surveillance video can be regarded as forensic evidence.

Resonant frequency of a piezoelectric quartz crystal in contact with solutions

1993 ◽  
Vol 274 (2) ◽  
pp. 209-217 ◽  
Author(s):  
Shigeru Kurosawa ◽  
Hideo Kitajima ◽  
Yoshihiko Ogawa ◽  
Makoto Muratsugu ◽  
Eiji Nemoto ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Quartz Crystal ◽  
Piezoelectric Quartz ◽  
Piezoelectric Quartz Crystal
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