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Online since: November 2012
Authors: Xiao Guang Jin, Yu Juan Jin, Hao Feng Tang
The exposed strata in the tunnel area were constituted with the Quaternary Holocene series residual, colluvium and drift bed, lower and middle Jurassic series Ziliujing group the purple red mudstone, shale with thin-bedded gray sandstone, upper Triassic series Xujiahe group (T3xj6 ~T3xj1) gray thick-bedded to coarse-grained arkose-quartz sandstone, shale.
Evaluation of the tunnel water inflow quantity The analysis of hydrological test results. ①Pumping test: According to the pumping test results which was did by the geological exploration units of ZK89, ZK92,and ZK95, the J1z mudstone permeability coefficient of ZK89 number of holes was 0.121 m/d, the water inflow quantity of single well was 8.31m3/d; the J1z argillaceous siltstone permeability coefficient of ZK92 holes was 0.163m/d, the water inflow quantity of single well was 22.16m3/d, the J1z argillaceous siltstone permeability coefficient of ZK95 holes was 0.044m/d, the water inflow quantity of single well was 98.94 m3/d.
Online since: October 2013
Authors: Li Wang, Hui Guo, Xiaoe Li
Earthwork filling test is mainly dry density, grain size analysis, moisture content, water ratio limit and compaction test.
The inspector digs a hole with ring cutting sampling on site, and the cross-sectional test pile number is identified by the engineering construction, supervision and inspection.
Online since: August 2010
Authors: Bin Xiang Sun, Wen Hui Bai
Along with the continuously accelerating development of China urbanization, a large amount of waste concrete buildings and structures are demolished, which produces a large number of waste concrete, but the traditional treatment for waste concrete hasn't been effectively utilized and has contaminated the environment.
Cement, 425R ordinary Portland cement; Sand (river sand), modulus of fineness 2.53, water absorption rate 1.0%, II class medium sand; Recycled coarse aggregate, from structural engineering laboratory of shaoxing university waste test pieces and blocks (strength of waste concrete 30-40MPa, age 8-10 years, the coarse aggregate of original concrete test piece is block stones); the recycled aggregate has been through hand breaking and screening, and its moisture content is 2.94%, crushing value 16.9%, grain size of recycled aggregate 5-20mm.
Online since: July 2013
Authors: Lorenzo Peroni, Martina Scapin, Federico Carra, Nicola Mariani
Property (units) Average Grain Size (mm) 10 Bulk Density (g/cm3) 1.83 Open Porosity (Vol%) 10 Pore size (mm) 1.5 Hardness (HR5-100) 95 Flexural Strength (MPa) 60 Compressive Strength (MPa) 125 Young's Modulus (GPa) 11.5 Thermal Conductivity (W/mK) 100 Experimental setup The experimental equipment used for spalling tests is based on the use of a standard SHPB setup (see Fig. 1 for the scheme of the test).
The specimens used for the preliminary tests (no failure) are then used for the next test inducing the failure (same ID number followed by the letter b).
Online since: December 2014
Authors: Na Wei, Jia Wei, Wei Wang
In this region, rice, wheat, corn as the main grain crops and cotton as the main economic crop, the special local products are agarics, gastrodia elata and konjak etc.
Therefore, the width and depth of new folk house is decreased to 3.3m * 3.6m, and the number of window is increased based on the traditional folk house, which can not only make the new folk house has better light environment , but also be helpful to form the wind indoors.
Online since: September 2016
Authors: Seyed Taghi Mohammadi Benehi, Sohrab Manouchehri, Mohammad Hassan Yousefi
Ferrites have a wide range of applications in microwave absorbance, number of electronic devices as radio, TV sets, integrated non-reciprocal circuits and telecommunication applications [2].
Curie temperature of ferrites is primarily determined by the materials’ main prescription, crystal structure and has little connection with the microstructure, for example, impurity, disfigurement and grain size of the materials [7].
Online since: July 2017
Authors: Mario Lessiak, Roland Haubner
Such fine-grained diamond coatings are preferred for abrasive devices, because of its high hardness and low friction [9, 10].
Seeding with diamond powder prior to deposition resulted in an increase of the particle number but a decrease in size (about 1 µm diameter).
Online since: January 2010
Authors: Dmitry G. Eskin, Laurens Katgerman, Mehdi Lalpoor
Presence of non-equilibrium phases especially on grain boundaries and in inter-dendritic spaces provides favorable paths for the crack initiation and propagation, and makes the material prone to cold cracking.
Acknowledgments This research was carried out under the project number 05237 in the framework of the Research Program of the Materials innovation institute (www.m2i.nl), former Netherlands Institute for Metals Research.
Online since: September 2009
Authors: Lin Zhu, De Ming Xiao, Peng Hai
The grain size of the principal abrasive and auxiliary abrasive is 100 and 120 respectively.
Table 1 Proportion of each ingredient of oilstones number of oilstones 1# 2# 3# 4# 5# 6# 7# 8# 9# 10# 11# 12# 13# 14# 15# Ingredient of abrasive SA / GC SA / GC SA / GC GC / SA GC / SA GC / SA GC / WA GC / WA GC / WA WA / GC WA / GC WA / GC WA GC SA proportion of each ingredient (%/%) 90 / 10 80 / 20 70 / 30 90 / 10 80 / 20 70 / 30 90 / 10 80 / 20 70 / 30 90 / 10 80 / 20 70 / 30 100 100 100 The honing stones evaluation, having many factors, is a comprehensive evaluation process in deep hole honing.
Online since: May 2025
Authors: Hoda El-Faramwy, Mamdouh Eissa, Saeed Ghali
Chromium and nickel equivalents for investigated stainless steels Steel number 1 2 3 4 5 6 7 8 Cr- equivalent 21.44 22.45 22.51 20.67 23.32 21.77 22.30 19.32 Ni – equivalent 21.27 17.07 21.55 21.25 23.98 22.70 23.47 23.43 The investigated stainless steels belong to austenitic region as shown in Fig. 7 according to Schaeffler diagram.
The microstructures of produced stainless steels show mainly austenitic phase with different grain size depending on the nitrogen content.
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