Air layers

The paper presents the characteristics of the ISO-4037 narrow spectrum X-ray reference fields in 02 different manners: simulation using the SpekPy and measurement using a calibrated ionization chamber. The physical (air Kerma rate) and radiation (X-ray fluence-spectrumaveraged energy, the first and the second half value layers, as well as the beam homogeneity coefficient) quantities were simulated using the SpekPy web-based simulation toolkit.

5p viambani 18-06-2024 3 1   Download

The parameters of the ISO-4037 wide spectrum (W-series) X-ray reference fields were simulated using the SpekPy web-based simulation software. One of the most important physical quantities (air Kerma rate) and other radiation quantities (X-ray fluence spectrum and its averaged energy, the first and the second half value layers, as well as the beam homogeneity coefficient) were also deduced.

4p viambani 18-06-2024 1 1   Download

Ebook "The bearing capacity of building foundations" describes the different ways of ultimate bearing capacity determination of building foundations. This four-chapter book considers the effect of a horizontal force acting on a foundation. It also examines a situation where, beneath the foundation level in the zone of influence of the foundation there are two layers of soil, including the case where the second, lower layer is formed by incompressible rock.

232p giangdongdinh 28-05-2024 3 2   Download

This paper presents a new design of Ge20Sb5Se75 large-solid-core- square lattice photonic crystal fiber (PCF) with the first ring of air hole near the core removed. Using the full vector finite element method for anisotropic perfectly matched layers, we numerically examine the dispersion characteristics of the PCF as a function of the wavelength in the mid-infrared range.

10p dianmotminh02 03-05-2024 3 1   Download

Nghiên cứu áp dụng các mô hình học máy bao gồm MLP (Multi-layer Perceptron), RF (Random Forest) và SVR (Support Vector Regression) để dự báo chỉ số chất lượng không khí tại Tp. Hồ Chí Minh. Dữ liệu đầu vào bao gồm chỉ số chất lượng không khí AQI (Air Quality Index) và 5 biến khí tượng (điểm sương, áp suất, nhiệt độ, độ ẩm, tốc độ gió) từ tháng 3/2019 đến tháng 6/2021, với 70% dữ liệu đầu vào được sử dụng cho giai đoạn huấn luyện và 30% dữ liệu còn lại sử dụng cho giai đoạn kiểm tra.

12p vicwell 06-03-2024 4 2   Download

This paper proposes a dual-band PIFA antenna operated at 28/38 GHz for 5G communication systems. The PIFA antenna consists of two dielectric layers and an air gap is inserted between these two layers. Both substrates, namely Roger RT dielectric, have a relative dielectric constant of 2.2 and a thickness of 0.127 mm.

9p vibego 02-02-2024 1 0   Download

Asphalt concrete pavement often appears damaged such as rutting, fatigue crack, potholes, etc. at high air temperature, heavy rain in long time, or at locations with high traffic, large horizontal force, and poor-quality construction sites. This causes a deterioration in the service quality, leading to a lot of maintenance costs.

8p visharma 20-10-2023 6 4   Download

Germanium doped photonic crystal fibers with differences in the layers' air hole diameters in the cladding are presented to obtain flat dispersion, small effective mode area, and low attenuation property for supercontinuum generation applications. The flatness and small value of the dispersion depend on the lattice geometry when the fibers have the same germanium doping concentration.

10p viberkshire 09-08-2023 8 4   Download

This paper proposes a method to determine the shape factor in the heat transfer model of silicon electrothermal V-shaped micro actuators by using ANSYS WORKBENCH. The rectangular cross-section model (w-width and h-thickness) is built to investigate the heat transfer from the beam to the substrate through a thin layer of air.

8p viargus 20-02-2023 4 1   Download

This paper aims at discussing our research on the temperature environmental condition of some arterials in Danang city and presents the laboratory experiments to develop a practical theory and propose a maintenance method to send temperature plummeting on asphalt concrete layer.

5p vilexus 05-10-2022 9 2   Download

Hybrid paper sheets were prepared by applying a thin coating layer of cross-linked polydimethylsiloxane (PDMS) and inorganic particles onto Whatman Grade 1 filter paper substrates. Several coatings with different inorganic particle contents and types were applied onto the paper substrates to investigate the effect of the variation in the coating formulation on the (i) wetting, (ii) water barrier properties, (iii) air barrier properties, (iv) surface roughness, and (v) mechanical properties of the samples.

11p tudichquannguyet 29-11-2021 12 1   Download

Anechoic layer is vital for the underwater acoustic stealth of submarines. This paper develops a simulation-based model for analysis of the acoustic properties of an underwater anechoic layer containing air-filled cavities. First, we present a numerical framework at a relevant scale to implement the acoustical model of an anechoic coating.

7p nguaconbaynhay12 13-06-2021 22 1   Download

This paper presents a simulation-based model for predicting the acoustic properties of underwater anechoic structures with its main layer made of viscoelastic sound absorbing materials including air-filled cavities. Some preliminary numerical results are first compared with the published analytical and experimental data to validate the proposed modeling.

12p cothumenhmong11 05-05-2021 16 1   Download

An investigation was carried out to find the role of physiological and biochemical factors in the success of different propagation methods of annual Moringa cv.PKM 1 with respect to root initiation, growth and graft compatibility.

5p trinhthamhodang1215 23-09-2020 10 1   Download

The by-products obtained from the coconut industry goes out as waste and pollute the environment, if not properly managed. In order to convert these by-products such as coir pith and coco peat into a natural organic resource, it is processed and utilized as an economical input in agriculture as well as in horticulture. Processed coir pith is used as an excellent soil amendment because of its favourable physical properties in maintaining soil health.

8p trinhthamhodang1215 23-09-2020 9 1   Download

An investigation on effect of month and IBA concentration on success of air layering in guava cv. Sardar at the Department of Fruit Science, Kittur Rani Channamma College of Horticulture, Arabhavi, University of Horticultural Sciences, Bagalkot, during the period of 2012-2013.

7p cothumenhmong7 09-09-2020 12 1   Download

Pomegranate can be propagated by seed, air layering, grafting, shoot cuttings and tissue culture. Seed propagation is used to raise the rootstocks that can be utilized for germplasm conservation and rootstocks breeding purpose. Vegetative propagation methods are used to multiply selected genotypes that bring similar character in form of clones having similar characters to mother plant. Vegetative propagation techniques (hard wood cutting, layering) are practices to raise the saplings for commercial production in pomegranate, because it perpetuates all characteristics of each cultivar.

16p nguaconbaynhay7 15-08-2020 16 1   Download

Fruit leathers are made by drying a very thin layer of fruit puree to produce a product with a texture similar to soft leather. Fruit leather is the product prepared by blending fruit purees or pulp extracted from ripe pulpy fruit, sugar or other nutritive sweeteners and other ingredients and additives desired for product and dehydrated to form sheet which can be cut to desired shape and size. The preservation of fruit leathers depends on their low moisture content, the natural acidity of the fruit used and high sugar contents.

6p caygaocaolon6 30-07-2020 14 1   Download

The surface profile of Fresnel lens during the fabrication process depends on many factors including the thickness, flatness, and pattern clarity of a photoresist (PR) film used as a hard mask for the Si lithography. SU-8 PR with a high viscosity, which is capable of creating large thickness films, can be used as a hard mask in the Fresnel lens fabrication processes. However, it is not easy to achieve a film thickness of about 10 µm with the requirement of a flat surface, free of air bubbles after the baking phases.

5p caygaocaolon6 22-07-2020 46 2   Download

The effect of the periodic oscillation of the gravitational field, known as g-jitter, on the free convection from a vertical plate is investigated in the present paper. The problem has been simplified by the laminar boundary layer and Boussinesq approximations. The fully implicit finite-difference scheme is used to solve the dimensionless system of the governing equations. The results for laminar flow of air (Pr = 0.72) and water (Pr = 7.00) are presented for different values of the amplitudes and frequencies of the g-jitter.

11p 12120609 01-06-2020 23 1   Download