Clay brick masonry unit(CBMU) walls are widely used in building structures,and its damage and protection under explosion loads have been a matter of concern in the field of engineering protection.In this paper,a serie...Clay brick masonry unit(CBMU) walls are widely used in building structures,and its damage and protection under explosion loads have been a matter of concern in the field of engineering protection.In this paper,a series of full-scale experiments of the response characteristics of 24 cm CMBU walls unreinforced and reinforced with polyurea elastomer subjected to blast loading were carried out.Through setting 5.0 kg TNT charges at different stand-off distances,the damage characteristics of masonry walls at different scaled distances were obtained.The reinforcement effect of different polyurea coating thicknesses and methods on the blast resistance performance of masonry walls under single and repeated loads were also explored.Five failure grades were summarized according to the dynamic response features of masonry walls.Based on the stress wave propagation pattern in multi-media composite structures,the internal stress distribution of masonry walls were analyzed,and the division basis of the masonry walls’ failure grades was then quantified.Combined with Scanning Electron Microscope(SEM)images,the deformation characteristics of soft and hard segments of polyurea and effects of detonation products on microstructures were revealed respectively,which provides an important reference for the design and application of polyurea in the blast resistance of clay brick masonry walls.展开更多
In this paper the entropy of a toroidal black hole due to a scalar field is investigated by using the DLM scheme. The entropy is renormalized to the standard Bekenstein-Hawking formula with a one-loop correction arisi...In this paper the entropy of a toroidal black hole due to a scalar field is investigated by using the DLM scheme. The entropy is renormalized to the standard Bekenstein-Hawking formula with a one-loop correction arising from the higher curvature terms of the gravitational action. For the scalar field, the renormalized Newton constant and two renormalized coupling constants in the toroidal black hole are the same as those in the Reissner-Nordstrom black hole except for other one.展开更多
One new coordination polymer with the chemical formula [CoCu2L2·K2·1.5C2H5OH]n（H4L = 2-hydroxy-3-[（E）-（{3-[（2-hydroxybenzoyl）amino]propyl}imino）methyl] benzoic acid） has been synthesized based on the...One new coordination polymer with the chemical formula [CoCu2L2·K2·1.5C2H5OH]n（H4L = 2-hydroxy-3-[（E）-（{3-[（2-hydroxybenzoyl）amino]propyl}imino）methyl] benzoic acid） has been synthesized based on the slow diffusion method,and characterized by IR spectroscopy,thermalgravimetric and X-ray diffraction analysis.It crystallizes in the monoclinic system,space group P21/n with a = 11.98860（10）,b = 24.4279（3）,c = 14.9008（2） ,β = 104.7490（10）°,V = 4220.01（8） 3,Z = 2,Mr = 1009.94,Dc = 1.590 g/cm3,F（000） = 2056,μ（MoKα） = 1.649 mm-1,the final R = 0.0411 and wR = 0.1178 for 5920 observed reflections with I 2σ（I）.The compound possesses a 2D brick wall structure constructed from trinuclear units.展开更多
Mud bricks were made in Egypt from the Nile silt, which is a mixture of clay and sand, which is sometimes mixed with pieces of organic materials and then mixed with water to make mud bricks, the oldest mud bricks were...Mud bricks were made in Egypt from the Nile silt, which is a mixture of clay and sand, which is sometimes mixed with pieces of organic materials and then mixed with water to make mud bricks, the oldest mud bricks were found in tombs dating back to Naqada and in Abydos, and parts of the central state pyramids were built from it, geological study and hydrogeology of the site were studied, mud bricks were studied by XRD and SEM, the main components and properties were studied, the mud bricks were made according to a local technique in industry and construction, the walls of Karnak temple become weak fragile materials due to their exposure to various damaging factors, the study put a recommended treatment of damaged mud bricks walls which surrounded of Karnak temple.展开更多
According to the container recycling institute,nearly a million plastic beverage bottles are sold every minute around the world.Plastic bottles are considered as an urban junk,however,it has shape characteristics whic...According to the container recycling institute,nearly a million plastic beverage bottles are sold every minute around the world.Plastic bottles are considered as an urban junk,however,it has shape characteristics which make them usable in construction in lieu of conventional bricks.This research promotes the use of recycled plastic bottles as eco-bricks by substituting it with the typical construction bricks.It evaluates the thermal performance of sand filled plastic bottle-walls in a comparative analysis with traditional composite brick walls.The thermal performance of the plastic bottle walls was evaluated through COMSOL®Multi-physics and the results are noted.展开更多
Peculiar color and form of Leizhou red-brick folk dwelling distinguishes it from other vernacular dwellings in Lingnan region(south of the Five Ridges, referring to the current Guangdong and Guangxi). The fi re-sealin...Peculiar color and form of Leizhou red-brick folk dwelling distinguishes it from other vernacular dwellings in Lingnan region(south of the Five Ridges, referring to the current Guangdong and Guangxi). The fi re-sealing gable wall(hereinafter referred to as fi re-sealing wall) in brilliant colors, diversifi ed forms and exaggerated shapes is a remarkable symbol of local dwellings. Originating from Fulao traditional vernacular dwelling and inheriting its advantages, fi re-sealing wall of Leizhou red-brick vernacular dwelling has shown diversity for the infl uence of immigrants, regional cultures, social background and economic status, and formed its own features in color, form and decoration. On the basis of fi eld investigation, this paper described diversifi ed features of the fi re-sealing wall of Leizhou red-brick vernacular dwelling, analyzed the causes of its diversity from the perspectives of aesthetics, function and technology, and explored the harmonious living philosophy implied by its function, form and art.展开更多
基金supported by the National Natural Science Foundation of China nos.51978660。
文摘Clay brick masonry unit(CBMU) walls are widely used in building structures,and its damage and protection under explosion loads have been a matter of concern in the field of engineering protection.In this paper,a series of full-scale experiments of the response characteristics of 24 cm CMBU walls unreinforced and reinforced with polyurea elastomer subjected to blast loading were carried out.Through setting 5.0 kg TNT charges at different stand-off distances,the damage characteristics of masonry walls at different scaled distances were obtained.The reinforcement effect of different polyurea coating thicknesses and methods on the blast resistance performance of masonry walls under single and repeated loads were also explored.Five failure grades were summarized according to the dynamic response features of masonry walls.Based on the stress wave propagation pattern in multi-media composite structures,the internal stress distribution of masonry walls were analyzed,and the division basis of the masonry walls’ failure grades was then quantified.Combined with Scanning Electron Microscope(SEM)images,the deformation characteristics of soft and hard segments of polyurea and effects of detonation products on microstructures were revealed respectively,which provides an important reference for the design and application of polyurea in the blast resistance of clay brick masonry walls.
文摘In this paper the entropy of a toroidal black hole due to a scalar field is investigated by using the DLM scheme. The entropy is renormalized to the standard Bekenstein-Hawking formula with a one-loop correction arising from the higher curvature terms of the gravitational action. For the scalar field, the renormalized Newton constant and two renormalized coupling constants in the toroidal black hole are the same as those in the Reissner-Nordstrom black hole except for other one.
基金Supported by the Technology Chamber of Henan Province (092300410031)the Education Chamber of Henan Province (2009A150005)
文摘One new coordination polymer with the chemical formula [CoCu2L2·K2·1.5C2H5OH]n（H4L = 2-hydroxy-3-[（E）-（{3-[（2-hydroxybenzoyl）amino]propyl}imino）methyl] benzoic acid） has been synthesized based on the slow diffusion method,and characterized by IR spectroscopy,thermalgravimetric and X-ray diffraction analysis.It crystallizes in the monoclinic system,space group P21/n with a = 11.98860（10）,b = 24.4279（3）,c = 14.9008（2） ,β = 104.7490（10）°,V = 4220.01（8） 3,Z = 2,Mr = 1009.94,Dc = 1.590 g/cm3,F（000） = 2056,μ（MoKα） = 1.649 mm-1,the final R = 0.0411 and wR = 0.1178 for 5920 observed reflections with I 2σ（I）.The compound possesses a 2D brick wall structure constructed from trinuclear units.
文摘Mud bricks were made in Egypt from the Nile silt, which is a mixture of clay and sand, which is sometimes mixed with pieces of organic materials and then mixed with water to make mud bricks, the oldest mud bricks were found in tombs dating back to Naqada and in Abydos, and parts of the central state pyramids were built from it, geological study and hydrogeology of the site were studied, mud bricks were studied by XRD and SEM, the main components and properties were studied, the mud bricks were made according to a local technique in industry and construction, the walls of Karnak temple become weak fragile materials due to their exposure to various damaging factors, the study put a recommended treatment of damaged mud bricks walls which surrounded of Karnak temple.
文摘According to the container recycling institute,nearly a million plastic beverage bottles are sold every minute around the world.Plastic bottles are considered as an urban junk,however,it has shape characteristics which make them usable in construction in lieu of conventional bricks.This research promotes the use of recycled plastic bottles as eco-bricks by substituting it with the typical construction bricks.It evaluates the thermal performance of sand filled plastic bottle-walls in a comparative analysis with traditional composite brick walls.The thermal performance of the plastic bottle walls was evaluated through COMSOL®Multi-physics and the results are noted.
基金Sponsored by General Program of National Natural Science Foundation of China(51278194)
文摘Peculiar color and form of Leizhou red-brick folk dwelling distinguishes it from other vernacular dwellings in Lingnan region(south of the Five Ridges, referring to the current Guangdong and Guangxi). The fi re-sealing gable wall(hereinafter referred to as fi re-sealing wall) in brilliant colors, diversifi ed forms and exaggerated shapes is a remarkable symbol of local dwellings. Originating from Fulao traditional vernacular dwelling and inheriting its advantages, fi re-sealing wall of Leizhou red-brick vernacular dwelling has shown diversity for the infl uence of immigrants, regional cultures, social background and economic status, and formed its own features in color, form and decoration. On the basis of fi eld investigation, this paper described diversifi ed features of the fi re-sealing wall of Leizhou red-brick vernacular dwelling, analyzed the causes of its diversity from the perspectives of aesthetics, function and technology, and explored the harmonious living philosophy implied by its function, form and art.
