scholarly journals ASSESSMENT OF THE DAMPING EFFICIENCY OF A NEW TYPE OF CONCRETE WALL BLOCK CONCRETE WALL BLOCK

2021 ◽  
Vol 177 (27) ◽  
pp. 7-12
Author(s):  
Izabela Adamczyk ◽  
Keyword(s):  
Concrete Wall ◽  
Wall Block ◽  
New Type ◽  
Block Concrete

scholarly journals Uplift Forces on Foundations in Frost Heaving Soils

1974 ◽  
Vol 11 (3) ◽  
pp. 323-338 ◽  
Author(s):  
Edward Penner
Keyword(s):  
Small Diameter ◽  
Ground Surface ◽  
Field Studies ◽  
Concrete Wall ◽  
Frost Heaving ◽  
Steel Columns ◽  
Air Temperatures ◽  
Block Wall ◽  
Uplift Forces ◽  
Block Concrete

Field studies of uplift forces by frost heaving are described for columns of various types and sizes and for a block concrete wall. The changing ground surface heave pattern around the block wall was used to predict the maximum heaving force which compared favorably with the measured value.Unit adfreeze strengths and maximum uplift forces were highest for steel columns, followed by concrete and wood; the lowest values were for the block concrete wall. In general, unit adfreeze strengths were highest for the small diameter columns and lowest on the largest columns. Differences are ascribed to the response of the various materials to air temperatures and to the shape and size of the structure.

Study and application of a new type of foamed concrete wall in coal mines

2013 ◽  
Vol 19 (3) ◽  
pp. 345-352 ◽  
Author(s):  
Zi-Bo Tang ◽  
Yong-Liang Zhao ◽  
De-Shun Kong ◽  
Dan Kan
Keyword(s):  
Coal Mines ◽  
Concrete Wall ◽  
Foamed Concrete ◽  
New Type

Test Study on the Mechanical Behavior of Recycled Aggregate Concrete Wall-Beam

2013 ◽  
Vol 351-352 ◽  
pp. 260-263 ◽  
Author(s):  
Min Zhang ◽  
Xiao Jian Fu ◽  
Yang Wu ◽  
Hao Sun
Keyword(s):  
Mechanical Behavior ◽  
Structural Integrity ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Brick Wall ◽  
Concrete Wall ◽  
Aggregate Concrete ◽  
Test Study ◽  
Strain Relationship ◽  
New Type

A new type of wall-beam was put forward, of which the upper wall is replaced by recycled aggregate concrete whose coarse aggregate is made of the waste brick. Three recycled aggregate concrete wall-walls and three ordinary brick wall-beams were tested, and then the bearing capacity, stress-strain relationship, cracking load and failure mode were analyzed. The results show that: the structural integrity of recycled aggregate concrete wall-beam is better than ordinary brick wall-beam, and the increase of the depth of joist can improve the mechanical behavior of wall-beam structure under the condition of same depth-span ratio.

scholarly journals Research on thermal performance of external thermal insulation composite concrete wall block

2018 ◽  
Vol 36 (1) ◽  
pp. 277-281
Author(s):  
Chenghua Zhang ◽  
Jisheng Qiu ◽  
Xiao Guan ◽  
Piji Hou ◽  
Wei Huang
Keyword(s):  
Thermal Insulation ◽  
Thermal Performance ◽  
Concrete Wall ◽  
Wall Block

The Application of Straw Concrete Wall Board in Constructional Engineering

2013 ◽  
Vol 438-439 ◽  
pp. 1607-1611
Author(s):  
Kun Qian ◽  
Tian Xia ◽  
Jie Zhang ◽  
Quan Yuan
Keyword(s):  
Engineering Application ◽  
Green Building ◽  
High Strength ◽  
Filling Material ◽  
Concrete Wall ◽  
Normal Concrete ◽  
Steel Bar ◽  
New Type ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

Constructional engineering was always faced with the threaten of earthquake and the problem of large energy consumption. As a new type of green building material, straw concrete has better ductility than normal concrete. In the straw concrete multi-ribbed slab structure, as the filling material of wall board, straw concrete improved the energy dissipation and deformability of wall board. When the load was applied, the filling blocks, grid frame and outer frame in straw concrete wall board work cooperatively, have good mechanical properties. The straw concrete wall board has advantages that light, high strength, energy conservation and seismic resistance. Considering the effect of different components in straw concrete wall board, this paper proposes the formula of vertical bearing capacity of straw concrete wall board to provide the basis for engineering application. The construction of straw concrete multi-ribbed slab structure include three processes that steel bar bind, blocks prefabrication and integral pouring, which fits for field fabrication in the building construction site.

The Microstructure of Shock-Synthesized Diamond

1967 ◽  
Vol 25 ◽  
pp. 324-325
Author(s):  
Lucien F. Trueb
Keyword(s):  
Single Crystals ◽  
Preferred Orientation ◽  
High Magnification ◽  
Texture Pattern ◽  
Shock Process ◽  
New Type ◽  
Diffraction Diagram

A new type of synthetic industrial diamond formed by an explosive shock process has been recently developed by the Du Pont Company. This material consists of a mixture of two basically different forms, as shown in Figure 1: relatively flat and compact aggregates of acicular crystallites, and single crystals in the form of irregular polyhedra with straight edges.Figure 2 is a high magnification micrograph typical for the fibrous aggregates; it shows that they are composed of bundles of crystallites 0.05-0.3 μ long and 0.02 μ. wide. The selected area diffraction diagram (insert in Figure 2) consists of a weak polycrystalline ring pattern and a strong texture pattern with arc reflections. The latter results from crystals having preferred orientation, which shows that in a given particle most fibrils have a similar orientation.

New type electron gun with electrostatic and electromagnetic lenses

1978 ◽  
Vol 36 (1) ◽  
pp. 62-63
Author(s):  
T. Ichinokawa ◽  
H. Maeda
Keyword(s):  
Electron Microscopy ◽  
Electron Beam ◽  
Optimum Condition ◽  
Bias Voltage ◽  
Electron Gun ◽  
Charge Effect ◽  
Micro Fabrication ◽  
Maximum Brightness ◽  
New Type ◽  
The Ideal

I. IntroductionThermionic electron gun with the Wehnelt grid is popularly used in the electron microscopy and electron beam micro-fabrication. It is well known that this gun could get the ideal brightness caluculated from the Lengumier and Richardson equations under the optimum condition. However, the design and ajustment to the optimum condition is not so easy. The gun has following properties with respect to the Wehnelt bias; (1) The maximum brightness is got only in the optimum bias. (2) In the larger bias than the optimum, the brightness decreases with increasing the bias voltage on account of the space charge effect. (3) In the smaller bias than the optimum, the brightness decreases with bias voltage on account of spreading of the cross over spot due to the aberrations of the electrostatic immersion lens.In the present experiment, a new type electron gun with the electrostatic and electromagnetic lens is designed, and its properties are examined experimentally.

A new type of defect structure in 124-superconducting oxide revealed by HREM

1991 ◽  
Vol 49 ◽  
pp. 1092-1093
Author(s):  
R. Sharma ◽  
B.L. Ramakrishna ◽  
N.N. Thadhani ◽  
D. Hianes ◽  
Z. Iqbal
Keyword(s):  
Shock Wave ◽  
Defect Structure ◽  
Neutron Radiation ◽  
Weak Links ◽  
Defect Structures ◽  
New Materials ◽  
New Type ◽  
Current Densities ◽  
Processing Techniques ◽  
Microstructural Studies

After materials with superconducting temperatures higher than liquid nitrogen have been prepared, more emphasis has been on increasing the current densities (Jc) of high Tc superconductors than finding new materials with higher transition temperatures. Different processing techniques i.e thin films, shock wave processing, neutron radiation etc. have been applied in order to increase Jc. Microstructural studies of compounds thus prepared have shown either a decrease in gram boundaries that act as weak-links or increase in defect structure that act as flux-pinning centers. We have studied shock wave synthesized Tl-Ba-Cu-O and shock wave processed Y-123 superconductors with somewhat different properties compared to those prepared by solid-state reaction. Here we report the defect structures observed in the shock-processed Y-124 superconductors.

ESEM - A multipurpose surface Electron Microscope

1986 ◽  
Vol 44 ◽  
pp. 632-633 ◽  
Author(s):  
G.D. Danilatos
Keyword(s):  
Electron Microscope ◽  
Room Temperature ◽  
Environmental Scanning ◽  
Gas Composition ◽  
Saturated Water Vapor ◽  
Surface Electron ◽  
Current State ◽  
Saturated Water ◽  
New Type ◽  
Temperature And Pressure

Over recent years a new type of electron microscope - the environmental scanning electron microscope (ESEM) - has been developed for the examination of specimen surfaces in the presence of gases. A detailed series of reports on the system has appeared elsewhere. A review summary of the current state and potential of the system is presented here.The gas composition, temperature and pressure can be varied in the specimen chamber of the ESEM. With air, the pressure can be up to one atmosphere (about 1000 mbar). Environments with fully saturated water vapor only at room temperature (20-30 mbar) can be easily maintained whilst liquid water or other solutions, together with uncoated specimens, can be imaged routinely during various applications.

Trial production of γ-type energy filtering TEM

1995 ◽  
Vol 53 ◽  
pp. 604-605
Author(s):  
Y. Taniguchi ◽  
E. Nakazawa ◽  
S. Taya
Keyword(s):  
Magnetic Energy ◽  
Electron Optics ◽  
Electron Microscopic ◽  
Mass Spectrometers ◽  
Ion Optics ◽  
Energy Filtering ◽  
New Information ◽  
New Type ◽  
Fringing Fields

Imaging energy filters can add new information to electron microscopic images with respect to energy-axis, so-called electron spectroscopic imaging (ESI). Recently, many good results have been reported using this imaging technique. ESI also allows high-contrast observation of unstained biological samples, becoming a trend of the field of morphology. We manufactured a new type of energy filter as a trial production. This energy filter consists of two magnets, and we call γ-filter since the trajectory of electrons shows ‘γ’-shape inside the filter. We evaluated the new energyγ-filter TEM with the γ-filter.Figure 1 shows schematic view of the electron optics of the γ-type energy filter. For the determination of the electron-optics of the γ-type energy filter, we used the TRIO (Third Order Ion Optics) program which has been developed for the design of high resolution mass spectrometers. The TRIO takes the extended fringing fields (EFF) into consideration. EFF makes it difficult to design magnetic energy filters with magnetic sector fields.

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