76results about How to "Low structural stability" patented technology

The invention discloses a mobile terminal (MT) including a bottom case, a display module, a middle frame shell and a mounting support. The display module is fixed on the mounting support. One side of the middle frame shell is provided with an installation channel in which the display module and the mounting support are fixed. The other side of the middle frame shell is provided with a connector by which the bottom case is buckled on the middle frame shell. The MT is applicable to the technical field of communication electronics and improves the structural stability; and moreover, a full screen design of the MT can be achieved, creating a better visual effect.

The invention relates to the field of secondary batteries, in particular to phenolic resin-based hard carbon microspheres, a preparation method thereof, and a negative electrode material containing the microspheres. The phenolic resin-based hard carbon microspheres provided by the invention are spherical; d002 is 0.375 to 0.380 nm; the specific surface area is 70 to 350 m<2> / g; the pore volume is 0.08 to 0.18 cm<3> / g. The phenolic resin-based hard carbon microspheres provided by the invention have a small specific surface area, structural stability, large interlayer spacing and rich pore structures, and can be applied to the negative electrode material of a lithium-ion battery or a sodium-ion battery, so that the battery has high capacity and stable cycle performance.

A battery is provided comprising a plurality of cylindrical type cells. Three cylindrical cells may be arranged in a triangular configuration with an electrical isolation spacer positioned between the three cylindrical cells, and a casing may be wrapped around the cells to restrict relative movement of the cells forming a cell group. Multiple cells groups, separated by electrical isolation spacers, may be electrically coupled via bus bars and arranged to form a cell module, where multiple cell modules may be included in the battery, and where the cell modules may be electrically coupled via inter-module connectors.

A baby stroller is provided, which includes a front wheel assembly, rear wheel assembly and a folding assembly. The folding assembly includes two lateral folding holders; each includes an upper-front fence tube, lower-front fence tube, upper-back fence tube, lower-back fence tube and a middle holder. The middle holder includes an upper folding joint, lower folding joint and a support stand rod disposed therebetween. The front ends of the upper-front and lower-front fence tubes are pivotally connected to a front wheel holder respectively. The rear ends of the upper-front and lower-front fence tubes are pivotally connected to the front ends of the upper and lower folding joints. The rear ends of the upper-back and lower-back fence tubes are pivotally connected to the rear wheel holder respectively. The front ends of the upper-back and lower-back fence tubes are pivotally connected to the rear ends of the upper and lower folding joints.

Disclosed herein is a middle- or large-sized battery pack case in which a battery module having a plurality of stacked battery cells, which can be charged and discharged, is mounted, wherein the battery pack case is provided with a coolant inlet port and a coolant outlet port, which are disposed such that a coolant for cooling the battery cells can flow from one side to the other side of the battery module in the direction perpendicular to the stacking direction of the battery cells, and the battery pack case is further provided with beads formed in a concavo-convex shape for improving the structural stability of the battery pack case against an external force, the beads being constructed in an outwardly-protruding structure to allow the coolant to be uniformly introduced into the battery module from the coolant inlet port in the advancing direction of a fluid in a flow space (“inlet duct”) defined between the coolant inlet port and the battery module.

The invention provides a metal oxide thin film transistor and a manufacturing method thereof. The metal oxide thin film transistor comprises a substrate, a gate, a gate insulating layer, a metal oxide semiconductor layer and a barrier layer hierarchically arranged on the substrate, a passivation layer arranged at the outermost layer, as well as a source and a drain connected with the metal oxide semiconductor layer respectively; a diffusion element containing insulator thin film layer adjacent to the barrier layer is arranged on the side opposite to the metal oxide semiconductor layer; and the diffusion element is any one of fluorine, nitrogen and hydrogen elements. The manufacturing method comprises the steps of arranging the diffusion element containing insulator thin film layer adjacent to the barrier layer on the side opposite to the metal oxide semiconductor layer, wherein the diffusion element is any one of fluorine, nitrogen and hydrogen elements; and diffusing the fluorine, nitrogen or hydrogen element to the metal oxide semiconductor layer of the thin film transistor via a thermal diffusion method, till reaching the metal oxide semiconductor thin film and the interface of the gate insulating layer.

The invention discloses a mobile terminal. The mobile terminal comprises a bottom housing, a middle frame housing, and a display module group. One side of the middle frame housing is provided with a groove, and the other side of the middle frame housing is provided with a connecting member. The display module group is fixedly disposed in the groove by adopting a multi-point glued joint way, and the bottom housing is disposed on the middle frame housing in a buckled manner by the connecting member. The mobile terminal is used for the communication electronic technology field, and a defect of poor structural stability is solved, and the full screen design of the mobile terminal is further realized, and therefore good visual effect is provided.

The invention discloses a wear detection-based online detection method for a rotation state and chord wear of a hob of a shield / TBM. Whether the hob rotates or not, whether the hob generates chord wear or not, and a chord wear state are judged according to detected hob state signal change characteristics. The method comprises the following steps: in a normal running wear state of the hob, acquiring a signal and calibrating a time-based change curve a of the signal; fitting out a time-based change curve b of the acquired signal of the hob in an actual working condition; analyzing a change ruleof the curve b, and judging whether the hob rotates or not; performing correlation analysis on the curve a and the curve b, and judging whether the hob is in normal wear or not; and increasing a sampling frequency, fitting out a time-based change curve c of the acquired signal, and judging whether the hob generates the chord wear or not and the edge number of chord wear. On the basis of an existing wear detection device, other detection devices are not additionally arranged, and by directly analyzing the signal acquired by the wear detection device, the rotation state of the hob and whether the hob generates the chord wear or not are judged, so that the detection method is simple and reliable.

The invention provides a long-span arch bridge with a single-leaf hyperboloid variable cross-section concrete-filled steel tube space truss arch rib. The long-span arch bridge with the single-leaf hyperboloid variable cross-section concrete-filled steel tube space truss arch rib is characterized in that a traditional equal cross-section arched steel tube arch limb is reformed into a single-leaf hyperboloid variable cross-section arched steel tube arch limb, and a four-limb space truss arch ribs is basket-shaped. The long-span arch bridge with the single-leaf hyperboloid variable cross-sectionconcrete-filled steel tube space truss arch rib has the advantages of reducing cross-section size at the vault, increasing cross-section size at the arch foot, meeting the mechanical characteristics of an arch bridge structure of large axial force at the arch foot and small axial force at the arch top, effectively reducing the center of mass and stiffness center of the arch bridge structure, improving the stability of a super-long span concrete filled steel tube arch bridge, reducing lifting construction weight of a mid-span vault segment and effectively lowering risk difficulty of construction lifting with multiple curved conical steel tube segments welded and assembled into the single-leaf hyperboloid variable cross-section steel tube arch limb, and improving the mechanical performance of the super-long span arch bridge, and allowing a super-long-span concrete filled steel tube arch bridge with 1000-meter span to be constructed with the single-leaf hyperboloid variable cross-sectionarched steel tube arch limb to construct the four-limb space truss arch rib to further construct the concrete-filled steel tube arch bridge.

The invention relates to a lignin hard carbon microsphere, a hydrothermal preparation method and an alkali metal ion battery negative electrode using the lignin hard carbon microspheres. Lignin is used as a precursor, and the lignin carbon microspheres are prepared by adopting a hydrothermal method. Lignin is firstly dissolved in water under full stirring to obtain a lignin solution; hydrothermalreaction is directly carried out on the lignin solution or the hydrothermal reaction is carried out after acid and alkali are added to adjust the pH value of the solution to obtain a lignin hydrothermal microsphere precursor; and after drying, the lignin microspheres are put into a tubular furnace, and high-temperature carbonization is carried out under the protection of inert gas to obtain the lignin carbon microspheres. The lignin carbon microsphere is high in sphericity degree, less in adhesion condition, good in structural stability, good in dispersity and capable of keeping a high-dispersion state. Low-cost process synthesis of industrial waste lignin hydrothermal balling is studied, and the industrial waste lignin hydrothermal balling is successfully applied to a negative electrode material of an alkali metal ion battery and high capacity, good rate charge and discharge performance and cycling stability are shown.

The invention discloses a method for beyond-limit arch replacing construction during preliminary bracing of a large-section loess tunnel. The method includes the steps of firstly, conducting radial grouting reinforcement on an arch wall, wherein radial grouting reinforcement is conducted on an arch replacing required section where arch replacing is required in the constructed loess tunnel from back to front; and secondly, conducting arch replacing construction, wherein a reinforced preliminary bracing structure in the arch replacing required section is detached, and preliminary bracing construction is conducted on the arch replacing required section synchronously in the detaching process. The method is simple in step, reasonable in design, simple in construction and good in use effect; theradial grouting reinforcement is conducted on the arch wall to reinforce the arch wall of a tunnel hole first, so the structural stability of the tunnel in the arch replacing process is ensured; segmented reinforcing is conducted on the preliminary bracing structure of the tunnel through a plurality of sleeve arch units for a reinforced sleeve arch in the arch replacing required section, so detaching is convenient; and moreover, the sleeve arch units are complementary and together improve the supporting force, so the adverse effects on the structural stability of the tunnel in the detaching process of each sleeve arch unit can be effectively reduced, and the safety and reliability of the arch replacing construction process are ensured.

The invention discloses an automatic wood cutting and grooving machine. The automatic wood cutting and grooving machine comprises a machine frame (1); a conveying device (2) is arranged in the machine frame (1); a cutting box (3) is arranged at one end of the conveying device (2); a vertical shaft (4) is arranged outside the cutting box (3); transverse knife saws (5) are arranged on the vertical shaft (4); a baffle (6) is arranged at one end of the cutting box (3); an edge cutting box (7) is arranged at one end of the baffle (6); a transverse shaft (8) is arranged at the bottom end of the edge cutting box (7); vertical knife saws (9) are arranged at the two ends of the transverse shaft (8) separately; a grooving device (10) is arranged at one end of the edge cutting box (7) and is connected with a rotary knob plate (11); and the rotary knob plate (11) is arranged outside the machine frame (1). The automatic wood cutting and grooving machine has the advantages that the efficiency can be improved, the operation performance can be improved, the cost can be lowered, in addition, the structural stability is good, the conveying efficiency is high, the application range is wide, and the precision is high.

The invention discloses a rainwater runoff treatment matrix and a rainwater bioretention pond constructed by using the matrix. A pyrite matrix layer on the lower layer of the rainwater runoff treatment matrix comprises pyrite, shell powder and a sandy material which are mixed according to the volume ratio of 10: 5: 85; and the upper biochar matrix layer comprises biochar or activated carbon, organic nutrient soil and a sandy material which are mixed according to a volume ratio of 20: 3: 77. A gravel drainage layer, a transition layer, a pyrite matrix layer, a biochar matrix layer, a sawdust protection layer and a water storage layer are sequentially arranged in a pond body of the rainwater bioretention pond from bottom to top; a perforated water collecting pipe is installed on the gravel drainage layer and connected with a lifting water outlet pipe, and the position height of the lifting water outlet pipe is equal to the top height of the pyrite matrix layer; and an overflow pipe is mounted at the top opening of the pond body. The matrix has the technical effects that the removal rate of common pollutants in the rainwater runoff is increased, the yield of byproducts can be reduced,and the matrix is durable.

The present invention discloses a continuous esterification micro-reaction apparatus and a micro-reaction system composed of the same. The continuous esterification micro-reaction apparatus is provided with a reaction chamber, a raw material inlet, a product outlet, a water outlet and a water permeable membrane. The water permeable membrane divides the reaction chamber into two parts, wherein a first part of the reaction chamber is communicated with the raw material inlet and the product outlet, the second part of the reaction chamber is communicated with the water outlet, and the spacing between the water permeable membrane and an inner wall of the first part, communicated with the raw material inlet and the product outlet, of the reaction chamber is 50[mu]m-2mm. The continuous esterification micro-reaction apparatus provided by the present invention is applied to a reactor for generating water. The water in the reaction can be removed from the reaction system so that the reaction is further carried out, thereby improving productivity, increasing product purity, and reducing waste discharge and post-processing cost.

Disclosed herein is a middle- or large-sized battery pack case in which a battery module having a plurality of stacked battery cells, which can be charged and discharged, is mounted, wherein the battery pack case is provided with a coolant inlet port and a coolant outlet port, which are disposed such that a coolant for cooling the battery cells can flow from one side to the other side of the battery module in the direction perpendicular to the stacking direction of the battery cells, and the battery pack case is further provided with beads formed in a concavo-convex shape for improving the structural stability of the battery pack case against an external force, the beads being constructed in a structure in which the beads do not disturb the flow of the coolant from the coolant inlet port along the advancing direction of a fluid in a flow space defined between the coolant inlet port and the battery module.

A secondary battery is provided, which includes a laminated electrode body and which has a current-collecting structure with favorable structural stability even when mounted to a vehicle and with superior high-rate charge-discharge characteristics. In a laminated electrode body included in a secondary battery provided by the present invention, a laminated positive electrode current collector-exposed portion and a laminated negative electrode current collector-exposed portion respectively constitute a plurality of current collector bundles which are bundled while being divided into two or more in a direction of lamination, each of the plurality of current collector bundles is individually and separately joined to the current collector portion on the same electrode side, and any of separators between positive and negative electrodes is enveloped in any of the plurality of current collector bundles on the side of the positive electrode current collector-exposed portion and / or any of the plurality of current collector bundles on the side of the negative electrode current collector-exposed portion.

The invention discloses a large-section loess tunnel supporting system and a supporting construction method. The large-section loess tunnel supporting system comprises a tunnel forepoling structure, atunnel initial supporting structure and a tunnel secondary lining. The upper surface of an inverted arch secondary lining in the tunnel secondary lining is a horizontal plane, and an inverted arch backfill layer is arranged on the horizontal plane. The supporting construction method comprises the following steps of firstly digging a tunnel and conducting initial supporting; and secondly constructing the secondary lining and backfilling the inverted arch. The large-section loess tunnel supporting system is reasonable in design, easy and convenient to construct, high in construction efficiencyand good in use effect, the tunnel forepoling structure, the tunnel initial supporting structure and the tunnel secondary lining constitute a combined supporting system to stably and reliably supportthe large-section loess tunnel, the upper surface of the inverted arch of the secondary lining is adjusted to be a horizontal plane, the construction process of the inverted arch of the tunnel can beeffectively simplified, and the rigidity of the inverted arch of the tunnel is greatly improved; in this way, the construction efficiency of the tunnel secondary lining is improved, the ring sealingtime of the tunnel secondary lining is shortened, the integrity of the tunnel secondary lining is higher, and the overall force bearing effect is better.

The invention discloses a bimetal cobalt oxide-based oxide as well as a preparation method and application thereof. The general formula of the bimetal cobalt oxide-based oxide is MaCobOn, a is 0-3, bis 0-3, a and b do not include 0, n is determined by the oxidation state of other elements, M is selected from one or more of iron, nickel, manganese, zinc or copper, and the surface of the bimetal cobalt oxide-based oxide has defects. The invention also discloses a preparation method and application of the catalyst. The structure of the precursor is controlled by regulating the optimal metal ionratio of the two transition metals and changing the mixed alcohol solvent in the solvothermal reaction, and finally the MaCobOn with different active site distributions can be obtained. As an oxygen reduction catalyst, the MaCobOn has the advantages of proper defects, high activity and stable performance, and meanwhile, the introduction of M metal greatly improves the electron transfer efficiencyand realizes an efficient oxygen reduction process. The preparation process of MaCobOn is simple, the process operability is high, and MaCobOn has good application prospects in the fields of metal-airbatteries, fuel cells, electrolytic cells, super capacitors and the like.

The invention discloses a construction method of a loess tunnel entrance section through a landslide mass. The method comprises the following steps that 1, an entrance soil layer is pre-reinforced; 2,a tunnel entrance is constructed; 3, excavation and initial support construction is conducted on the reinforced tunnel section; 4, a reinforced tunnel section base is reinforced; 5, the reinforced tunnel section is subjected to secondary lining construction; 6, excavation and initial support construction is conducted on a rear side tunnel section; and 7, the rear side tunnel section is subjectedto secondary lining construction. The method is reasonable in design, simple and convenient to construct and good in use effect, cement-soil mixed piles are adopted for pre-reinforcement before excavation, a construction process of the tunnel entrance section through the landslide mass is guaranteed to be safe and reliable, meanwhile, the tunnel entrance section is excavated by adopting a three-step excavation method, the reinforced tunnel section base is reinforced, an excavation process of the tunnel entrance section through the landslide mass can be guaranteed to be safe and reliable, in addition, the influence on the stability of a soil layer on the circumferential side of the tunnel entrance is small, and the stability of the excavated and formed tunnel entrance can be effectively improved.

The invention discloses a method for preparing maleic acid isopropyl ester. The method comprises the following steps of: (1) preparing sulfonacid ionic liquid onium salt through sultone and nitrogen tertiary amine compounds; (2) dissolving the sulfonacid ionic liquid onium salt into water, slowly dropwise adding acid under ice bath so as to prepare a sulfonacid ionic liquid; and (3) carrying out condensation and reflux reaction on maleic anhydride, isopropanol, the sulfonacid ionic liquid and a water-carrying agent, separating a liquid, circularly catalyzing the sulfonacid ionic liquid at the lower layer, carrying out decompression distillation on an ester layer at the upper layer, then neutralizing with alkali, layering, and carrying out decompression distillation to obtain finished maleic acid isopropyl ester. The sulfonacid ionic liquid catalyst can be recycled and can absorb water, thus being beneficial to forwarding operation of the reaction, and realizing the recovery and recycling of excessive alcohol. The method is simple in procedures, pollution-free and non-corrosion, and has the advantages of being mild in conditions, environment-friendly and economic in benefits.

The invention discloses a through landslide body loess tunnel construction method. The through landslide body loess tunnel construction method comprises the following steps of constructing a tunnel entrance section and a tunnel exit section simultaneously; and respectively constructing an inclined shaft auxiliary construction inlet section and an inclined shaft auxiliary construction outlet section through a tunnel inclined shaft when the tunnel entrance section and the tunnel exit section are constructed. The through landslide body loess tunnel construction method is reasonable in design, convenient to construct and good in using effect; the loess strata in the construction area where the tunnel entrance section is positioned is subjected to reinforcement treatment by using a cement soilmixing pile in advance before excavation, and the reinforcement length and the reinforcement depth are effectively limited; a loose soil body on a hole body of a tunnel hole is solidified in advance so as to ensure the safety and reliability of the construction process of a hole inlet section of the through landslide body loess tunnel; meanwhile, in the construction process of the tunnel by adopting a three-step excavation method, the construction process of track plates is completed synchronously, so that the construction process of the loess tunnel can be completed easily, conveniently and quickly; and the stability of an excavated and formed tunnel hole can be effectively improved.

The invention discloses an adsorption film based on a metal organic framework material, a preparation method and application, and belongs to the field of advanced wastewater treatment and reuse. The adsorption film is prepared by blending the modified metal organic framework material and a casting solution, wherein the modified metal organic framework material comprises an iron oxide. The invention further provides a wastewater advanced treatment method. The method comprises the following steps that a, wastewater containing pollutants passes through the adsorption film, and the pollutants areadsorbed; b, the adsorption film treated in step a is placed in a hydrogen peroxide solution for stirring, and pollutant degradation and film material regeneration are carried out, wherein the hydrogen peroxide solution is an acidic solution. According to the method, the film separation section adsorption pollutants are coupled with film cleaning section oxidation degradation pollutants so that the adsorption and degradation efficiency of the pollutants can be effectively improved, and the problem that the service life of a film material in a long-term film catalysis process is shortened can be effectively solved.

The invention discloses a construction method of a water-rich loess tunnel capable of passing through a loess gulley. The water-rich loess tunnel comprises a tunnel entrance entering section, a gulleyshallow-buried tunnel section and a front side tunnel section, wherein the gulley shallow-buried tunnel section is connected between the tunnel entrance entering section and the front side tunnel section; the construction method comprises the following steps: 1, constructing the tunnel entrance entering section; 2, constructing the gulley shallow-buried tunnel section; and 3, constructing the front side tunnel section. The construction method is simple in step, reasonable in design, simple and convenient in construction and excellent in using effect; the reasonable look-ahead reinforcing method and the tunnel base reinforcing method are selected to reinforce the tunnel soil mass according to different stratums of the tunnel entrance entering section, the gulley shallow-buried tunnel section and the front side tunnel section, the excavation process of the water-rich large-cross-section loess tunnel can be effectively ensured to be safe and reliable, and the stability of the dug formedtunnel can be effectively improved.

The invention provides a positive electrode material and a preparation method therefor, and a secondary battery.The positive electrode material comprises a core material having a layered structure andlithium nickel manganese oxide having a spinel structure and coating the core material, D50 of the lithium nickel manganese oxide is 30-100 nm and a specific surface area BET is 20-100 m<2> / g. According to the positive electrode material, the overcharge potential safety hazard of the secondary battery can be reduced from a chemical system, and meanwhile, a first discharge capacity and a capacityretention ratio of the secondary battery can be improved so that the cycle performance of the secondary battery is improved. The preparation method of the positive electrode material comprises the following steps: (1) preparing lithium nickel manganese oxide, namely preparing a lithium nickel manganese oxide powder material with a spinel structure and a D50 of 30-100nm by adopting a liquid-phase sol-gel method; and (2) coating the lithium nickel manganese oxide: coating the core material with the layered structure of the lithium nickel manganese oxide by using a dry coating method. The lithiumnickel manganese oxide powder shell material is prepared by adopting a liquid-phase sol-gel method, and the coating layer is prepared by adopting a dry method so that the prepared material is betterin coating performance, and better overcharge secondary battery safety can be obtained.

Disclosed herein is a middle- or large-sized battery pack case in which a battery module having a plurality of stacked battery cells, which can be charged and discharged, is mounted, wherein the battery pack case is provided with a coolant inlet port and a coolant outlet port, which are disposed such that a coolant for cooling the battery cells can flow from one side to the other side of the battery module in the direction perpendicular to the stacking direction of the battery cells, and the battery pack case is further provided with beads formed in a concavo-convex shape for improving the structural stability of the battery pack case against an external force, the beads being constructed in an outwardly-protruding structure to allow the coolant to be uniformly introduced into the battery module from the coolant inlet port in the advancing direction of a fluid in a flow space (“inlet duct”) defined between the coolant inlet port and the battery module.

The invention discloses a plugging removal liquid for plugging slurry and a preparation method thereof, belonging to the field of the oilfield chemistry. The plugging removal liquid for the plugging slurry comprises the following components in percentage by mass: 5.0%-8.0% of a plugging removal agent, 1.0%-2.0% of a corrosion inhibitor, 0.2%-0.5% of a corrosion inhibition synergist, 1.0%-2.0% of an iron ion stabilizer, and hydrochloric acid, with the balance being water, wherein hydrogen chloride in the hydrochloric acid accounts for 15.0%-20.0% of the mass percent of the plugging removal liquid, and the plugging removal agent contains two groups, namely hydroxyl and carboxyl groups. The plugging removal liquid is good in plugging removal effect, does not damage a reservoir, is free of corrosion to pipelines or equipment, and can meet the requirements of drilling operation.

The invention discloses a deep-buried loess tunnel deformation control construction structure based on a cover arch and a method. The structure comprises a tunnel primary support structure body for primary support of a tunnel and the reinforcement cover arch arranged on the inner side of the tunnel primary support structure body, wherein the tunnel primary support structure body and the reinforcement cover arch form a reinforced primary support structure body. The method comprises the following steps of 1, carrying out tunnel excavation and primary support; and 2, carrying out reinforcement arc arch construction. The structure and the method have the advantages of being reasonable in design, simple and convenient in construction and good in use effect, the reinforcement cover arch is adopted to reinforce the tunnel primary support structure body and form the reinforced primary support structure body, an isolation layer is arranged between the reinforcement arc arch and the tunnel primary support structure body, in addition, the reinforcement cover arch adopts a plurality of cover arch units to reinforce the tunnel primary support structure body in a segmented mode, so that the construction is simple and convenient, moreover, the reinforced primary support structure body formed by construction has certain self-adaptive capacity and can effectively adapt to the deformation condition of soil mass on the peripheral side of the tunnel, and therefore the deformation resistance of the reinforced primary support structure body can be effectively enhanced.