Off-centering hollow ball node

The invention relates to an eccentric hollow sphere node, comprising a hollow sphere, chord members and web members. The hollow sphere can be formed by casting, or butt welding two hemispheres which are made by pressing sheets of steel; ribbed stiffeners can be arranged in the hollow sphere when the stress is large. The chord members are connected with the hollow sphere eccentrically, and can be formed by round steel tubes or square steel tubes. The web members are connected with the hollow sphere in centre and can be formed by round steel tubes. The chord members and the web members are directly welded with the hollow sphere or are cast together with the hollow sphere to form the eccentric hollow sphere node. The eccentric hollow sphere node has the advantages that: a great mount of intersecting line cutting work in an intersecting node structure is avoided; processing and manufacture are easy; node quality is easy to guarantee; the construction cost is low; meanwhile, the eccentric hollow ...

Folding switching house cover

The invention discloses a retractable fold steel roof structure, comprising H-shaped steel beams, horizontal intersecting supports between beams, fixed nodes on ends of the beams, driving wheels, rolling nodes on the ends of the beams, drive sets, retracted stopping steel plates, a connecting rod, slide rails on end parts of the H-shaped steel beams, slide rails on middle parts of the H-shaped steel beams, rotating rods, steel balls, components for welding H-shaped steel plates, pin shafts, roof supporting components, guide rails and rails for the beams to run. The invention is characterized in that: the retracted stopping steel plates on the rails lock or release a roof; the drive sets drive a beam which is connected with the drive sets to run through the connecting rod, so that a horizontal intersecting support between beams is driven to slide in slide rails, thereby other beams are driven to run along rails at two sides; the retractable folding and unfolding of the horizontal intersecting ...

Suspendome concrete integrated floor structure and construction method thereof

The invention discloses a suspended concrete integrated floor, which comprises a reinforced concrete slab, an embedded part, a support bar, a perforating steel ball, a steel guy cable, a single-pore steel plate, a turning steel bar, a pin shaft, a large-sized wedge-shaped steel plate, a middle-sized wedge-shaped steel plate, a small-sized wedge-shaped steel plate, a large-sized cross steel plate,a small-sized cross steel plate, a force bearing sleeve, a screw stem, a hot-cast anchor, a sealing sleeve and a fixing nut, wherein the reinforced concrete slab adopts a preformed slab; the lower part members of the preformed slab are connected with one another and then are welded with the preformed slab through the embedded part; after each member is installed, placing of back casting zone between slabs, tensioning of a steel rope and removing of a template and a scaffold are carried out to finally form a suspended concrete integrated floor structural system. The suspended concrete integrated ...

BIV infectivity indication cell line using firefly luciferase as reporting gene

A Bovine Immunodeficiency Virus BIV infected cell system and use are disclosed. The process is carried out by inserting firefly luciferase gene into a specific respondent element of respondent Bovine Immunodeficiency Virus BIV trans activated factor, constructing indication plasmid, transfecting it to BHK-21 cell, screening expressed cell system, mono-cloning, and selecting negative cloning. It can be used to indicate BIV infection and activate BIV trans factor.

Chord branch barrel shell structure system

The invention discloses a shell-structure system of a sting-supported cylinder, which comprises a shell, a supporting rod, an inhaul cable, an anchoring node and a turning node. The shell can adopt a net-shell structure with single-layer cylinder surface or with double-layer cylinder surface. The inhaul cable can be connected to the node in the cross cylinder-shell space or to a support. The inhaul cable is connected with the lower part of the supporting rod through the turning rod, and the upper part of the supporting rod is connected to the shell so as to form the shell-structure system of a string-supported cylinder. The shell-structure system of a sting-supported cylinder has the advantages of overcoming the bad stability of single-layer cylinder shell or the thiner double-layer net shell and small striding ability through fully making use of the good compression performance of the shell and high-strength tensile performance of cable material, the shell-structure system of a sting-supported ...

Building materialization stage construction optimization method, electronic equipment and storage medium

The invention provides a building materialization stage construction optimization method, electronic equipment and a storage medium. The method comprises the following steps: acquiring a BIM model of a target building; according to the BIM model, determining material data and construction data of the target building; obtaining a carbon emission factor of each alternative material included in the material data and a carbon emission factor of each energy included in the construction data; according to the material data and the construction data of the target building, the carbon emission factor of each alternative material and the carbon emission factor of each energy source, establishing a first target function by taking the minimum total carbon emission as a target, and establishing a second target function by taking the minimum total cost as a target to obtain a multi-target function; the multi-objective function is solved, at least one optimal building scheme is obtained, and the optimal ...

Folding terrace structure

The invention relates to a folding retractable terrace structure, comprising side columns, a beam, a column bottom guide rail, a column bottom sliding guide rail groove, a column top guide rail groove, a control fixture block, intercolumnar supports, a driving wheel and covering surfaces. The folding retractable terrace structure comprises a fixing unit, a middle unit and a front end closing unit,and the outer walls and top layers of all the units are provided with the covering surfaces. The side columns and the beam are the skeleton of the whole structure. The column bottom sliding guide railgroove is buckled on the column bottom guide rail, and the joint of the column top guide rail groove and the beam is provided with the control fixture block. A locking motor is arranged on the drivin g wheel, and the driving wheel drives all the units to slide so as to realize the folding/opening/closing of the whole terrace structure. The locking motor can be controlled and deadlocked by an instruction ...

BIV indication cell line using enhanced green fluorescence protein as reporting gene

A Bovine Immunodeficiency Virus BIV infected cell system and use are disclosed. The process is carried out by expressing reinforced EGFP under BIV infectious specific condition, constructing respondent Bovine Immunodeficiency Virus BIV infected reporting plasmid with nucleotide acid sequence in sequence table, transfecting it to BHK-21 cell, screening expressed cell system, mono-cloning and selecting high-expression EGFP negative cloning. It can be used to indicate BIV infection and activate BIV trans factor.

Fabricated building wall and construction method

The invention provides a fabricated building wall and a construction method.The building wall is formed by vertically and/or horizontally connecting a plurality of unit modules, each unit module comprises a wall plate and two stand columns, the middles of the stand columns are fixedly connected to the two sides of the wall plate through connecting assemblies, and the stand columns are formed by splicing a plurality of cold-formed thin-walled section steel; a plurality of vertically-through semi-closed spaces are formed in the stand columns, and the adjacent semi-closed spaces are communicated through first through holes formed in the cold-formed thin-walled steel. A first gap is formed between the wall plate and each stand column. A first pouring body is formed in all the semi-closed spaces and the first gaps in a pouring mode in the mode of wrapping the stand columns. According to the scheme, concrete is poured into the vertically-through semi-closed spaces and the first gaps, the concrete ...

HIV-1 integrase expression bacterial strain and integrase inhibitor in-vitro screening model

Cable-strut rib beam combined floor and construction method thereof

The invention discloses a cable-strut rib beam combined floor and a construction method thereof and belongs to the field of building floor structures and construction methods. The cable-strut rib beam combined floor comprises floor units and reinforcing cages and steel inhaul cables used for connection among the floor units. Each floor unit comprises ribbed beams, a node and circular steel tubes. The construction method includes that a temporary support is arranged, a precast concrete frame beam is disposed in place, reserved reinforcing steel bars among the ribbed beams are connected through bolt sleeves, the reinforcing cages sleeve outside the ribbed beams, and the steel inhaul cable are tensioned after the circular steel tubes and the steel inhaul cables on the lower portions of the ribbed beams are disposed in place; after the ribbed beams bulge to a theoretical calculating value, precast concrete roof boards are disposed, precast connecting pieces on the ribbed beams are inserted ...

Chord branch barrel shell structure system

The invention discloses a shell-structure system of a sting-supported cylinder, which comprises a shell, a supporting rod, an inhaul cable, an anchoring node and a turning node. The shell can adopt a net-shell structure with single-layer cylinder surface or with double-layer cylinder surface. The inhaul cable can be connected to the node in the cross cylinder-shell space or to a support. The inhaul cable is connected with the lower part of the supporting rod through the turning rod, and the upper part of the supporting rod is connected to the shell so as to form the shell-structure system of a string-supported cylinder. The shell-structure system of a sting-supported cylinder has the advantages of overcoming the bad stability of single-layer cylinder shell or the thiner double-layer net shell and small striding ability through fully making use of the good compression performance of the shell and high-strength tensile performance of cable material, the shell-structure system of a sting-supported ...

Arch bridge deflection measuring apparatus

The invention relates to an arch bridge deflection measurement device, comprising two arch steel tubes, a tensional suspension girder and a displacement meter, wherein, the two arch steel tubes are symmetrically arranged at two sides of an arch bridge, and are parallel with axle wires of the two sides of the arch bridge; arch bases of the steel tubes can either be rigid mounts or hinge mounts andbe fixed on the riverside; the arch of each steel tube is supported on the lateral of the arch bridge through a directional support; a plurality of vertical hanging sticks are extracted from the archofeach steel tube, and the hanging sticks at corresponding positions of two sides are connected with each other through the tensional suspension girder passing through the bottom of the bridge; and the displacement meter is supported on the tensional suspension girder to measure the deflection on the point. The arch bridge deflection measurement device is mainly used for measuring displacement ofth e ...

Stud welding equipment and stud welding method

The invention provides stud welding equipment and a stud welding method.The stud welding equipment comprises a mechanical arm, a connecting base, a rotary driving device, a stud disc, a lifting driving device, a welding gun device and a control device, the rear side of the connecting base is connected to the mechanical arm, and the rotary driving device and the lifting driving device are both arranged on the front side face of the connecting base; the nail disc is connected to the driving end of the rotating driving device and provided with a plurality of placing positions evenly distributed around a rotating shaft, a receding space is formed between every two adjacent placing positions, and the welding gun device is arranged at the driving end of the lifting driving device and can penetrate through the receding spaces. According to the stud welding equipment and the stud welding method, continuous and automatic welding actions can be achieved, an operator does not need to conduct manual ...

Method for preparation of silver antimony telluride thermoelectric material by combining low temperature solid phase reaction with hot pressing process

The invention relates to a method for preparation of a silver antimony telluride thermoelectric material by combining low temperature solid phase reaction with hot pressing process. The method comprises the steps of: 1) ingredient compounding: according to the stoichiometric ratio of each element in the chemical formula AgSbTe2+x, weighing elemental silver, elemental tellurium and elemental antimony as raw materials, wherein x is 0-0.02; 2) briquetting sealing; 3) solid phase reaction: raising the temperature of the vacuum-tight block obtained in step 2) to a reaction temperature of 390-450DEG C, and conducting heat preservation for 6-12h to obtain a single phase silver antimony telluride ingot body or approximate single phase silver antimony telluride ingot body; 4) hot-pressing: grinding the obtained ingot and then performing hot pressed sintering, thus obtaining the high density silver antimony telluride thermoelectric material. The method has the characteristics of low reaction temperature ...

Folding switching house cover

The invention discloses a retractable fold steel roof structure, comprising H-shaped steel beams, horizontal intersecting supports between beams, fixed nodes on ends of the beams, driving wheels, rolling nodes on the ends of the beams, drive sets, retracted stopping steel plates, a connecting rod, slide rails on end parts of the H-shaped steel beams, slide rails on middle parts of the H-shaped steel beams, rotating rods, steel balls, components for welding H-shaped steel plates, pin shafts, roof supporting components, guide rails and rails for the beams to run. The invention is characterized in that: the retracted stopping steel plates on the rails lock or release a roof; the drive sets drive a beam which is connected with the drive sets to run through the connecting rod, so that a horizontal intersecting support between beams is driven to slide in slide rails, thereby other beams are driven to run along rails at two sides; the retractable folding and unfolding of the horizontal intersecting ...

HIV-1 integrase expression bacterial strain and integrase inhibitor in-vitro screening model

The invention relates to an HIV-1 integrase expression bacterial strain and an integrase inhibitor in-vitro screening model. In the model, HIV-1 integrase soluble expression plasmid and expression plasmid with integrase LTR sequence are firstly established based on gene engineering technology, and established recombinant plasmid pET28a-IN is transferred into commercial colibacillus BL21 to obtainthe integrase expression bacterial strain; and then the integrase expression bacterial strain is cultured in large-scale, finally integrase is separated and purified, works on the substrate plasmid and is added into samples to measure the activity. The detection model overcomes the defects such as high cost, high background and more influence factors in the existing ELISA detection method; the detection model can carry out primary screening on various natural or chemically synthetic integrase inhibitors in-vitro largely and quickly; and the detection model is an HIV-1 integrase in-vitro screening ...

Suspendome concrete integrated floor structure and construction method thereof

The invention discloses a suspended concrete integrated floor, which comprises a reinforced concrete slab, an embedded part, a support bar, a perforating steel ball, a steel guy cable, a single-pore steel plate, a turning steel bar, a pin shaft, a large-sized wedge-shaped steel plate, a middle-sized wedge-shaped steel plate, a small-sized wedge-shaped steel plate, a large-sized cross steel plate, a small-sized cross steel plate, a force bearing sleeve, a screw stem, a hot-cast anchor, a sealing sleeve and a fixing nut, wherein the reinforced concrete slab adopts a preformed slab; the lower part members of the preformed slab are connected with one another and then are welded with the preformed slab through the embedded part; after each member is installed, placing of back casting zone between slabs, tensioning of a steel rope and removing of a template and a scaffold are carried out to finally form a suspended concrete integrated floor structural system. The suspended concrete integrated ...

Production method for self-insulation composite lightweight wall block

The invention relates to a production method for a self-insulation composite lightweight wall block and aims at effectively solving the problems of complex production process, low strength, great possibility of dropping powder, high water absorption and the like of aerated concrete blocks. The method comprises the following steps: adding magnesium chloride into water to prepare brine, adding trisodium phosphate, phosphoric acid, a NNO dispersing agent, isocyanate resin and ferrous sulfate into the brine, and uniformly stirring; adding magnesium oxide, coal ash, polypropylene bunchy monofilament fibers into the brine, and uniformly stirring to prepare a surface material; uniformly mixing silicate cement with river sand, calcium stearate and a foam stabilizing enhancer, then sequentially adding water and hydrogen peroxide, uniformly mixing to obtain mixed materials, pouring the mixed materials into a mold for forming, demolding, maintaining, and cutting; pouring the surface material into ...

Off-centering hollow ball node

The invention relates to an eccentric hollow sphere node, comprising a hollow sphere, chord members and web members. The hollow sphere can be formed by casting, or butt welding two hemispheres which are made by pressing sheets of steel; ribbed stiffeners can be arranged in the hollow sphere when the stress is large. The chord members are connected with the hollow sphere eccentrically, and can be formed by round steel tubes or square steel tubes. The web members are connected with the hollow sphere in centre and can be formed by round steel tubes. The chord members and the web members are directly welded with the hollow sphere or are cast together with the hollow sphere to form the eccentric hollow sphere node. The eccentric hollow sphere node has the advantages that: a great mount of intersecting line cutting work in an intersecting node structure is avoided; processing and manufacture are easy; node quality is easy to guarantee; the construction cost is low; meanwhile, the eccentric hollow ...

BIV infectivity indication cell line using firefly luciferase as reporting gene

A Bovine Immunodeficiency Virus BIV infected cell system and use are disclosed. The process is carried out by inserting firefly luciferase gene into a specific respondent element of respondent Bovine Immunodeficiency Virus BIV trans activated factor, constructing indication plasmid, transfecting it to BHK-21 cell, screening expressed cell system, mono-cloning, and selecting negative cloning. It can be used to indicate BIV infection and activate BIV trans factor.

TM mode medium cavity filter

The invention discloses a TM mode medium cavity filter. The TM mode medium cavity filter comprises metal cavity walls and a metal cover plate, wherein the metal cavity walls and the metal cover plate form an inner cavity, a medium is arranged in the middle portion of the inner cavity, and the upper end and the lower end of the medium are fixed on the bottom of the metal cover plate and the metal cavity respectively; a metal ring is arranged at the side of the medium, and the metal ring is connected to the metal cover plate on the upper portion of the inner cavity through a medium screw. The TM mode medium cavity filter solves the problems that an existing debugging device is complex and the frequency change is irreversible, the frequency debugging scope of the TM mode medium cavity filter is enabled to be larger, and the debugging process is simple, repeat and reversible.

Method for preparing silver antimony telluride thermoelectric material by taking binary tellurides as start raw materials

The invention relates to a method for preparing a silver antimony telluride thermoelectric material by taking binary tellurides as start raw materials. The method comprises the following specific steps: 1) weighing silver telluride and antimony telluride at a certain molar ratio as start raw materials; 2) uniformly mixing the start raw materials in the step 1), pressing into a block and performing vacuum sealing; 3) heating the block obtained after the vacuum sealing in the step 2) to a reaction temperature of 420-500 DEG C, and reacting for 3-12h to obtain a single-phase or near single-phase silver antimony telluride ingot; and 4) grinding the ingot obtained in the step 3), and performing spark plasma sintering to obtain a dense silver antimony telluride thermoelectric material. The raw materials adopted in the method are stable in air and hardly oxidized, and large-scale and low-cost production is easy to realize; a protective atmosphere is not needed the storage and mixing processes ...

Arch bridge deflection measuring apparatus

The invention relates to an arch bridge deflection measurement device, comprising two arch steel tubes, a tensional suspension girder and a displacement meter, wherein, the two arch steel tubes are symmetrically arranged at two sides of an arch bridge, and are parallel with axle wires of the two sides of the arch bridge; arch bases of the steel tubes can either be rigid mounts or hinge mounts and be fixed on the riverside; the arch of each steel tube is supported on the lateral of the arch bridge through a directional support; a plurality of vertical hanging sticks are extracted from the arch of each steel tube, and the hanging sticks at corresponding positions of two sides are connected with each other through the tensional suspension girder passing through the bottom of the bridge; and the displacement meter is supported on the tensional suspension girder to measure the deflection on the point. The arch bridge deflection measurement device is mainly used for measuring displacement of ...

Folding terrace structure

The invention relates to a folding retractable terrace structure, comprising side columns, a beam, a column bottom guide rail, a column bottom sliding guide rail groove, a column top guide rail groove, a control fixture block, intercolumnar supports, a driving wheel and covering surfaces. The folding retractable terrace structure comprises a fixing unit, a middle unit and a front end closing unit, and the outer walls and top layers of all the units are provided with the covering surfaces. The side columns and the beam are the skeleton of the whole structure. The column bottom sliding guide rail groove is buckled on the column bottom guide rail, and the joint of the column top guide rail groove and the beam is provided with the control fixture block. A locking motor is arranged on the driving wheel, and the driving wheel drives all the units to slide so as to realize the folding/opening/closing of the whole terrace structure. The locking motor can be controlled and deadlocked by an instruction ...

Cable and arch combined roof based on negative pressure reinforcing technology

The invention discloses a cable and arch combined roof based on the negative pressure reinforcing technology. The cable and arch combined roof comprises steel arches, lug plates, steel arch connecting pieces, steel wire bundles, cable anchors, nodes and built-in fittings. Firstly, the ends of the steel arches are connected through the connecting nodes, secondly, the steel wire bundles are connected with the nodes and the lug plates through the cable anchors, thirdly, the steel wire bundles between connecting arches and the nodes are stretched and drawn, and finally, the overall negative pressure reinforcing cable and arch combined roof structure is formed. The cable and arch combined roof has the advantages that the tensile performance of materials is fully utilized, and the stability of the steel arches is improved by appropriately exerting negative pressure, the crossing range of the roof structure is large, the construction process is easy and convenient, and the cable and arch combined ...

BIV indication cell line using enhanced green fluorescence protein as reporting gene

A Bovine Immunodeficiency Virus BIV infected cell system and use are disclosed. The process is carried out by expressing reinforced EGFP under BIV infectious specific condition, constructing respondent Bovine Immunodeficiency Virus BIV infected reporting plasmid with nucleotide acid sequence in sequence table, transfecting it to BHK-21 cell, screening expressed cell system, mono-cloning and selecting high-expression EGFP negative cloning. It can be used to indicate BIV infection and activate BIV trans factor.