Strip Size Research Articles

Development of an UHF 2 x 2 Microstrip Antenna Array for Nano-Satellites

This paper presents the study of a microstrip antenna to be installed onto meteorological nano-satellites. In order to increase the effective ground plane so as to improve the front-to-back ratio and the gain, overall, metallic strips were attached to the antenna ground plane. The antenna performance was evaluated using different types and sizes of metallic strips. An improvement in the front-to-back ratio whilst keeping good axial ratio performance was observed.

Synchrotron Radiation Method for Study the Dynamics of Nanoparticle Sizes in Trinitrotoluene During Detonation

This work presents the results of experiments using synchrotron radiation from the VEPP-4M accelerator complex at Budker Institute of Nuclear Physics. Dynamic of small-angle X-ray scattering of synchrotron radiation was implemented on the synchrotron radiation beamline 8-b. Here given beam parameters and described elements of the station and detector system. The distance from the axis of the explosive charge to the detector was 3432 mm. The strip size of the detector DIMEX was 0.1 mm. Thus, a single channel of the detector DIMEX in these experiments corresponded to the scattering angle 2θ: 1 detector channel = 0.02914 mrad. The SAXS measurement technique on this station enables detection of nanoparticles ranging in size from 2 nm to 200 nm with exposure time 73 ps for one frame. It is possible to record 100 frames with interval 100 ns. In this work used TNT with 30 mm in diameter and 55 mm in length. Ultra fine diamonds of 2 nm size was detected behind the detonation front, after that the average size of particles increases up to 5–6 nm during few microseconds.

A novel double-incidence and multi-band left-handed metamaterials composed of double Z-shaped structure

In this paper, a novel double-incidence and multi-band left-handed metamaterial (LHM) was presented based on coplanar electric and magnetic resonators, whose structure is composed of two orthogonal Z-shaped metallic strips on each side of the dielectric substrate respectively. Both the double Z-shaped LHM for electromagnetic wave parallel and normal incidences are discussed. The structure exhibits two LH pass-bands and one right-handed pass-band when electromagnetic waves are incident parallel to the substrate, while it can achieve multiple LH pass-bands under normal incidence with the same structure and only single size of Z-shaped strips. By means of theoretical analysis, building equivalent magnetic resonance circuit models, numerical simulation, extracting the effective permittivity, permeability from S parameters and the experimental measurement, the left-handed properties are analyzed and verified. The fabricated double Z-shaped metamaterials will create a new way to prepare the electromagnetic cloak which is suitable for multiple frequencies, and the cloak of infrared or visible frequency, especially with the same structure and in same size from different incident directions.

Holographic entanglement entropy in superconductor phase transition with dark matter sector

In this paper, we investigate the holographic phase transition with dark matter sector in the AdS black hole background away from the probe limit. We discuss the properties of phases mostly from the holographic topological entanglement entropy of the system. We find the entanglement entropy is a good probe to the critical temperature and the order of the phase transition in the general model. The behaviors of entanglement entropy at large strip size suggest that the area law still holds when including dark matter sector. We also conclude that the holographic topological entanglement entropy is useful in detecting the stability of the phase transitions. Furthermore, we derive the complete diagram of the effects of coupled parameters on the critical temperature through the entanglement entropy and analytical methods.

Stabilising the cohesive soil with palm fibre sheath strip

A multiple regression model was used based on experimental data using regression analysis method to predict the strength of Shanghai cohesive soil reinforced with strips of natural palm sheath strips. Four different variables were studied to investigate the behaviour and strength of reinforced cohesive soil with palm sheath strips. These are the content, size and aspect ratio of palm sheath strips as well as the normal stress applied in the shear tests. For this purpose, a series of direct shear tests were conducted on unreinforced and reinforced soil specimens. Test results showed that using strips of natural palm sheath improved the strength of the tested soil. Increasing content of palm sheath has a more significant effect on the enhancement of residual strength compared to the enhancement of peak shear strength. Content, size, aspect ratio of palm sheath strips and the normal stress applied have significant effects on the improvement of both peak and residual strength. Utilisation of such natural palm sheath in this way will help in preparation of green composites as well as reducing the cost of ground improvement. Results showed that multiple linear regression models can accurately predict the strength of Shanghai cohesive soil reinforced with local palm sheath strips within the range of the studied variables and type of soil tested in this paper. Consequently, using such regression models will save time as well as reduce laboratory costs.

Gate-Tunable mid-Infrared Plasmonic Planar Band-Stop Filters Based on a Monolayer Graphene

In this paper, the graphene ribbon bus waveguide side-coupled a coplanar short graphene strip, constructed on a monolayer graphene with substrates by spatially varying external gates, is proposed and investigated numerically by using the finite-difference time-domain (FDTD) method. Simulated results exhibit that the outstanding mid-infrared band-stop filtering effect is realized based on the edge mode resonance in the short strip acting as a perfect Fabry-Perot resonator. By changing the locations of gate voltages to vary the size of the short graphene strip, not only the Fabry-Perot resonance mode is tuned effectively but also the original rectangular-loop resonance mode appears. The changes in the coupling distance and substrates are also used for modulating the transmission spectrum. FDTD results are in excellent agreement with the coupled-mode theory (CMT). The simple structure without doubt is a real electrically controlled plasmonic device. Our studies will support the fabrication of planar nano-integrated plasmonic circuits for mid-infrared optical processing.

Improvement of Engineering Properties of Igbokoda Standard Sand with Shredded Polyethylene Wastes

Geotechnical tests were carried out on sand samples to determine important properties of sand modified with strips of high density polyethylene (HDPE) waste. Strips sizes of 15x20 mm, 20x25mm, 25x30mm were used at concentrations of 1%, 2%, 3%, 4% and 5% by mass of the soil sample. Direct shear test results indicate that with the addition of shredded polyethylene, the shear stress value increased from 4.29kN/m2 to a maximum value of 8.21kN/m2 (a percentage increase of 68.54%) while the angle of internal friction of the sand increased from 18˚ to a maximum value of 28˚ (a percentage increase of 55.56%). The coefficient of permeability “k” reduced with increasing strip size and strip concentration thereby modifying the hydraulic property of the sand from a fine sand range (1.30 x 10-5m/sec) to a silty sand range (4.95 x 10-6m/sec). The permeability test result further shows a direct relationship between the increasing shredded polyethylene sizes and a reduction in the permeability of the soil.http://dx.doi.org/10.4314/njt.v34i3.3

UTILIZATION OF STONEDUST WITH PLASTIC WASTE FOR IMPROVING THE SUBGRADE IN HIGHWAY PAVEMENT CONSTRUCTION

Stone dust is a kind of waste material that is generated from the stone crushing industry which is abundantly available to the extent of 200 million tonnes per annum , that has landfill disposal problems and health and environmental hazards. This study cover on utilization of stone dust reinforced with PET strips(polyethylene terephthalete)improving the sub grade. Now a day’s both stone dust and plastic water bottles are creating environmental disposal problem as well as health problem. Therefore utilization of these waste material in proper manner is creating challenge to society. PET strips obtained from waste plastic water bottle, were mixed randomly with stone dust. A series of California bearing ratio (CBR) tests were carried out on reinforced stone dust. Three different sizes of PET strips were used in this study. The effect of strips content(0.25% to 2%) and length on the CBR value of reinforced stonedust were investigated. Addition of PET strips with in stone dust with appropriate amount improved the strength of sub grade. This reinforcing material can used as sub grade material in constructing the rural road over saturated clay. This method is a environmental friendly and reduce the disposal problem.

3D FEM analyses of the ultrasonic transducer for controlled nanowire rotary driving

Controlled rotary driving of single nano objects is an important technology in the assembling of nano structures, handling of biological samples, nano measurement, etc. However, there have been little analyses on the ultrasonic transducers for the nano rotary driving, which makes the transducer’s optimization impossible. In this work, vibration characteristics of the ultrasonic transducer for rotary driving of single nanowires, which has been proposed by the authors’ group, are analyzed by the 3D finite element method (FEM), and some useful guidelines for designing the transducer are achieved. It is found that the working point still exists when the commonly used metal materials in ultrasonic transducers are used as the vibration transmission strip, and when the vibration transmission strip’s size changes. It is also found that the direction of the elliptical motion of the micro manipulating probe’s tip may be reversed by changing the size of the vibration transmission strip properly. In addition, to ensure the performance consistency of the device, the micro manipulating probe’s length Lm or driving frequency should be designed to avoid the resonance of the micro manipulating probe.

Electric and magnetic resonance in metal strip tetramer

We have numerically investigated the transmission and plasmon resonance properties of the metal strip tetramer. The results show that in the symmetric model there are three sharp transparent windows, the first and third peaks’ transmittance are more than 75%. When decreasing metal strips size or increasing gap distance, the transmission spectra blue-shift and intensities change. While introducing asymmetry, the transmission spectra and Plasmon resonance significantly change, whether to modify the size or the gap distance, a new dip exist on the second peak, and one or two new peaks exist on the third dip. Through analysis of the electric-magnetic properties, we find that the new dip results from asymmetric second-order magnetic resonance, while the peak is originated from the strong electric resonance. It is also demonstrated that the sensor sensitivity in this proposed system can reach of 380nm/RIU. The resonator design strategy opens up a rich pathway for the implementation of optimized optical properties for specific applications.

Lifting posterior mitral annuloplasty for enhancing leaflet coaptation in mitral valve repair: midterm outcomes.

We evaluated the midterm outcomes of lifting posterior mitral annuloplasty for enhancing leaflet coaptation in mitral valve repair. Between October 2007 and December 2012, 341 consecutive patients with significant mitral regurgitation underwent lifting posterior mitral annuloplasty using a specially designed fabric annuloplasty strip that lifts the middle portion of the posterior annulus. Associated procedures for mitral valve repairs, such as patch valvuloplasty for posterior leaflet prolapse (n=80), new chord placement for anterior leaflet prolapse (n=33), commissurotomy (n=29), and posterior leaflet extension (n=23), were performed in 141 patients (41.3%). Thirty-day mortality was 0.9%. Nine late deaths (2.6%) occurred. Mean overall survival at 5 years was 96.0%±1.1%. During the mean follow-up period of 38±17 months, six patients (1.8%) underwent valve-related reoperation (5-year freedom from valve-related reoperation, 98.1%±0.8%). At 5 years, mean freedom from recurrence of mitral regurgitation grade 3+ to 4+ (moderate to severe) was 95.1%±1.6%. The mean valve pressure gradient (PG) was 3.2±1.5 mmHg across all strip sizes at the time of follow-up. Lifting posterior mitral annuloplasty using an innovative annuloplasty strip in mitral valve repair has a low rate of recurrent regurgitation or valve-related reoperation with rare relevant complications.

Slot antenna with multiband functionality in wireless industrial applications

ABSTRACTA unique slot antenna, for multiband applications with asymmetric coplanar waveguide feed is proposed. Different form of strips is used as grounded slits for providing multiband functionality. By adopting the proposed strips length and size, much wider impedance band width is achieved in two bands. Beside that an asymmetric feeding method is applied with rectangular patch for generating new resonances and good matching. By utilizing this novel method, good impedance matching is seen in both bands. The antenna size is only about 40 × 40, which covers the frequency band from 4.8 to 6.5 GHz in band#1 and from 7.8 to 8.4 GHz in band#2 for VSWR <2. Furthermore, by variation of strips positions and patch lengths, the control of the impedance band width and resonances are steered. Both simulated and measured results are illustrated and compared with each other to guaranties antenna's performance. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1653–1655, 2015

Bio-inspired mechanics of highly sensitive stretchable graphene strain sensors

Graphene woven fabrics (GWFs) can sense large strain up to 10% with the highest gauge factors (105) thus far reported. This result promises key applications particularly in sensing strains of soft materials such as biological tissues, but the mechanism of such super gauge factor (SGF) property was not very clear. Through a bio-inspired Voronoi polycrystalline micromechanics model together with experimental validations, we show that the successive cracking, the “fish-scale” like network structure of GWFs, and the superlubricity between overlapped graphene flakes play crucial roles resulting in the SGF property. We also reveal the influences of overlapping width, graphene strip size, Poisson's ratio of the substrate material, size effect, interfacial resistance, and network size to the SGF property. These results can guide the design of GWFs with desired sensing performance.

Continuous extrusion and rolling forming technology of copper strip manufacture

Continuous extrusion and rolling technology was proposed as a new strip production technology. It finished hot rolling process using the waste heat of the continuous extrusion forming. The continuous extrusion and rolling forming process was simulated by DEFORM-3DT software. The influence of extrusion wheel velocity and strip size on the continuous extrusion and rolling forming process was analyzed. The experiment was carried out according to optimized results of numerical simulation, the microstructure and property of copper strip were fine.

The Technology Study of Steel Belt Feeding Machine of Crystallizer of Continuous Casting

Crystallizer steel belt feeding technology make use of melt’s fusion decalescence, controlling the distribution of melt temperature field, restrain the columnar crystal’s growing to eliminate the composition segregation and internal loose of continuous casting. And it will improve the continuous casting’s quality. By discussing the effect of casting speed, the size of steel, casting section and other factors on the steel belt feeding speed, making comparison of different casting section get strip suitable feeding speed and range of strip size, combining with a steel for steel strip feeding test mold, its theoretical and practical production results the basic agreement

Ray Effects Elimination in Discrete Ordinates and Finite Volume Methods

Ray effects through two- and three-dimensional isotropically scattering, participating media are investigated using four ordinates methods: discrete ordinates, using a classical quadrature scheme and a refined azimuthal discretization around the azimuthal angle endpoints; and finite volume, with and without refined azimuthal discretization around the azimuthal angle endpoints. The discrete ordinates method with refined azimuthal angular discretization consists of a coupling of Gaussian quadrature for polar discretization and control azimuthal angle discretization splitting into a quadruple range. For both the discrete ordinates method with refined azimuthal angular discretization and the finite volume method with refined azimuthal angular discretization, the azimuthal direction is discretized such that azimuthal grid points are close to the azimuthal angle endpoints. Radiative heat transfer through isotropically scattering, participating and optically thin media within enclosures considering uniform and strip diffuse boundary conditions is considered. Excellent agreement between the discrete ordinates method/ finite volume method with refined azimuthal angular discretization and the benchmark literature results is achieved for high-order azimuthal discretization, whereas finer high-order azimuthal discretization is required for the finite volume method. Ray effects are eliminated for combinations of higher-order azimuthal discretization and refined azimuthal discretization around the azimuthal angle endpoints. It has also been found that, in order to eliminate ray effects, the discrete ordinates and finite volume methods’ quadrature sets’ order must be increased as the medium’s aspect ratio decreases or when the size of the diffuse strip of incident radiation on one of the medium’s surfaces is decreased.

Fabrication of Artificial Periodic Defects in Colloidal Photonic Crystals by Photolithography

We introduce artificial periodic defects with required size in colloidal photonic crystals by a simple and inexpensive photolithography. The morphology of colloidal photonic crystals with defects is observed by field emission scanning electron microscope (SEM) and optical properties by UV-VIS spectra. We find that the periodic photoresist strips will cause a blue shift and the shift value depends on the the size of periodic photoresist strips.

Assessment of application of pectin, whey protein concentrate, soy protein isolated and methyl cellulose films to improve quality of potato strips

Deep-fat frying is a method widely used in the preparation of tasty food with an attractive appearance. However, oil uptake in fried foods has become a health concern. To meet the recent trends and consumer demand for lowfat products, there exists a need for reducing oil uptake during deep-fat frying. Recent studies have experimented with the use of edible coatings and films as barriers to the incorporation of oil during the frying process. Our objective was to evaluate the moisture retention and fat reduction capabilities of different edible film coatings (Methyl cellulose, Pectin, Whey protein isolate and Soy protein isolate) during deep-fat frying. Potato strips (size 0.8*0.8*8 cm) were used as the model food system. Oil uptake and moisture content were measured. Textural and colorific changes in fried potato strips were followed by the parameter maximum force (MF) and L*, a*, b*. What has emerged is that the using of edible coatings is an effective technique for reducing the oil contents and water retention of potato crisps. And also results showed that using of the coatings caused improving in texture and color qualities.

AdS plane waves, entanglement, and mutual information

$AdS$ plane wave backgrounds are dual to CFT excited states with energy momentum density $T_{++}=Q$. Building on previous work on entanglement entropy in these and nonconformal brane plane wave backgrounds, we first describe a phenomenological scaling picture for entanglement in terms of "entangling partons". We then study aspects of holographic mutual information in these backgrounds for two strip shaped subsystems, aligned parallel or orthogonal to the flux. We focus on the wide ($Ql^d\gg 1$) and narrow ($Ql^d\ll 1$) strip regimes. In the wide strip regime, mutual information exhibits growth with the individual strip sizes and a disentangling transition as the separation between the strips increases, whose behaviour is distinct from the ground and thermal states. In the narrow strip case, our calculations have parallels with "entanglement thermodynamics" for these $AdS$ plane wave deformations. We also discuss some numerical analysis.

Coupled Thermo-Mechanical FEM Simulation of Multi-Pass Vertical-Horizontal Rolling Process

The governing equations and the finite element model for the coupled thermo-mechanical multi-pass vertical-horizontal rolling process of a zircaloy strip are established. Considering the temperature-dependent and strain rate-dependent constitutive relation of zircaloy, the numerical simulation of the three-pass V-H rolling process is realized by the coupled thermo-mechanical dynamic explicit finite element method. The computational results such as the plastic deformation, the size variations and the temperature variations in three passes are discussed. The research results indicate that edging by vertical roller benefits improving the sizes of the strip and the temperature variations are rather obvious during the three-pass hot rolling process. The research provides experience and foundations for the FEM simulation of the hot rolling process of composite slabs for nuclear fuel elements.