4390 results about "Dielectric permittivity" patented technology

The invention relates to the technical field of model construction, in particular to a method for constructing an effective dielectric constant model of a carbon fiber composite material. The method comprises the following steps: collecting a sample, carrying out electromagnetic orthogonal frequency sweep analysis, generating a spectrum distribution map, obtaining internal field distribution mapping data through boundary topology recombination, carrying out interval correlation analysis on the internal field data, generating a spatial distribution function, and calibrating a phase resonance point to obtain a frequency characteristic spectrum. Performing field region classification and interactive coupling evaluation according to the frequency characteristic spectrum, deducing a node link structure, performing internal and external field interactive tensor projection and constraint embedding processing based on the node link structure, constructing a composite field model, generating a dielectric frequency dispersion curve through dielectric characteristic inversion, and performing modeling based on frequency dispersion curve data to obtain an effective dielectric constant model. According to the invention, the more accurate construction method of the carbon fiber composite material effective dielectric constant model is realized.

Gate isolation processes (e.g., gate-to-source / drain contact isolation) are described herein. An exemplary contact gate isolation process may include recessing (e.g., by etching) sidewall portions of a high-k gate dielectric and gate spacers of a gate structure to form a contact gate isolation (CGI) opening that exposes sidewalls of a gate electrode of the gate structure, forming a gate isolation liner along the sidewalls of the gate electrode that partially fills the CGI opening, and forming a gate isolation layer over the gate isolation liner that fills a remainder of the CGI opening. A dielectric constant of the gate isolation liner is less than a dielectric constant of the high-k gate dielectric. A dielectric constant of the gate isolation layer is less than a dielectric constant of the high-k gate dielectric. A dielectric constant of the gate isolation layer may be less than a dielectric constant of the gate isolation layer.

The invention relates to a modeling and optimizing method for inter-layer signal crosstalk of a PCB (Printed Circuit Board). Frequency response data of all dielectric layers of the PCB under different temperature and humidity conditions are collected, and a mapping model with the temperature gradient and the humidity diffusion gradient as input and the dielectric constant as output is established. And calculating the dynamic distribution of mutual capacitance and mutual inductance under the environment change by combining the spatial layout parameters of the differential signal pair, and constructing a crosstalk sensitivity evaluation model with coupled frequency, environment and layout. And high-risk areas with crosstalk sensitivity caused by environment change are identified, and the crosstalk change rate of each area is quantified. For a sensitive area, a temperature and humidity compensation medium structure is introduced to stabilize local dielectric characteristics and reduce the influence of the environment on crosstalk. And according to the compensated medium distribution, adjusting a differential signal wiring path and impedance matching by adopting an optimization method with the aim of minimizing the crosstalk change rate, and generating a wiring layout with environmental robustness. According to the invention, the signal integrity and the transmission reliability of the multi-layer PCB in a temperature and humidity changing environment can be effectively improved.

The invention relates to the technical field of low-dielectric heat-conducting functional materials, in particular to a nano silicone rubber composite material as well as a preparation method and application thereof. According to the preparation method, a modified vinyl silsesquioxane coupling agent is taken as a bridge, and boron nitride nanosheets, silicon carbide nanowires and the modified vinyl silsesquioxane coupling agent are covalently connected through hydrolysis reaction, so that a heterostructure is constructed, and the nano heat-conducting filler is obtained; the preparation method comprises the following steps: dispersing a nano heat-conducting filler in vinyl silicone oil, and constructing a covalent cross-linked network through addition cross-linking reaction and curing treatment to obtain the nano composite silicone rubber material. According to the processing method, the filling amount, the dielectric constant and the dielectric loss can be reduced, meanwhile, the heat conduction capacity is improved, and the problems that in the prior art, the dielectric constant and the dielectric loss are low due to simple mixing of the boron nitride nanosheets and the silicon carbide nanowires are solved.

The invention belongs to the technical field of connectors and discloses a design method for a low-loss cable connector without resonance points, comprising: designing a spiral gradient groove structure on the surface of an inner conductor based on the impedance continuity principle, establishing a composite gradient impedance theoretical model of the connector, constructing a dielectric constant gradient distribution model of a double insulating layer, and setting a transition function between an inner layer and an outer layer; solving the S parameters and electric field distribution of the connector through electromagnetic-thermal coupling finite element simulation, optimizing the spiral angle θ and the gradient index n, establishing a quantitative model of the surface roughness of the conductor and high-frequency loss, and determining a threshold range of the surface roughness through calculation of the quantitative model; performing global optimization of structural parameters based on a multi-objective genetic algorithm, outputting a theoretical design parameter set and a report collection of performance verification, eliminating the resonance point problem of traditional connectors, and providing excellent low-loss performance in the full frequency band, which is particularly suitable for high-frequency and high-power transmission environments.

The invention discloses an embankment hidden danger detection and early warning method and system based on electric field and electromagnetic field coupling, and the method comprises the following steps: obtaining and processing the resistivity and dielectric constant of an embankment dam body, constructing a joint inversion objective function based on a processing result, and carrying out the detection and early warning of the embankment hidden danger. A joint inversion model is established, a minimum joint inversion objective function is used for solving, a multi-physics field joint inversion result is obtained and used for delineating an abnormal area, a time-shifting resistivity monitoring network is arranged in the area for detection, the seepage velocity is obtained, soil mass mechanical parameters are defined, and the seepage velocity is calculated. And constructing an embankment hidden danger numerical model, using seepage velocities as boundary condition input, simulating embankment dam body stability safety coefficients under different seepage velocities, setting an early warning threshold value, and giving an alarm when the embankment dam body stability safety coefficients reach the early warning threshold value. Through coupling analysis of the earth electric field, the seepage velocity and the like, data multiplicity is effectively eliminated, the defect resolution is remarkably improved, and the misjudgment risk is greatly reduced.

The invention relates to the technical field of oil and gas well drilling, in particular to an experimental system for measuring the dielectric constant of drilling fluid, which comprises a reaction kettle body, a pressure unit, a temperature unit and a dielectric constant sensor. In the oil-gas well drilling operation process, whether the overflow phenomenon occurs in an oil-gas well or not is judged by monitoring the fluctuation of the dielectric constant of drilling fluid in real time, but the fluctuation of the dielectric constant can also be caused by changes of physical conditions such as pressure and temperature of the drilling fluid, and if the fluctuation of the dielectric constant caused by the changes of the physical conditions is not eliminated, the overflow phenomenon is judged. If so, the accuracy of overflow monitoring is influenced. In the application, the pressure unit and the temperature unit are used for respectively changing the pressure and the temperature of the drilling fluid so as to obtain the change relationship between the pressure and the temperature of the drilling fluid and the dielectric constant; therefore, whether the fluctuation of the dielectric constant of the drilling fluid in the oil and gas well is caused by the change of physical property conditions such as pressure and temperature or not is judged according to the change relation, and the accuracy of overflow monitoring is further improved.

The invention discloses a difunctional filler synergistically enhanced polymer solid electrolyte and a solid-state battery, and belongs to the field of solid-state batteries. The electrolyte adopts a polymer matrix, a lithium salt and two functional fillers: the first filler has a high dielectric constant, and can accelerate dissociation of the lithium salt, fix negative ions of the lithium salt and improve the transference number of lithium ions under the action of self polarization; and the second filler has high electrochemical window and ionic conductivity, can inhibit high-voltage decomposition, and is adaptive to a high-voltage positive electrode material. Through cooperation and balance design of the two kinds of filler, ion transmission, interface stability and high-pressure compatibility can be considered at the same time. In addition, the invention further designs a composite negative pole piece, the surface of the negative pole piece is coated with the solid electrolyte, and the ion transmission kinetics in the pole piece can be remarkably improved. On the basis, the invention develops a high-performance solid-state battery which is excellent in electrochemical performance and can play an important role in the fields of consumer electronics, electric automobiles, energy storage systems, low-altitude flight and the like.

The invention discloses an intelligent detection method for water pollutants, which comprises the following steps of: transmitting a signal of a specific frequency band to a water body through an electromagnetic wave transmitting module, acquiring reflected and refracted signals by using a multi-channel receiver, extracting the characteristics of dielectric constant, refractive index and the like of the water body, and analyzing the types and the concentration range of the pollutants by adopting a pattern recognition algorithm; the method comprises the following steps: selecting a micro-fluidic chip and an electrochemical unit, selecting a corresponding biosensor for targeted detection, processing detection data through the micro-fluidic chip and the electrochemical unit, predicting the concentration, spatial distribution and trend of pollutants through a data analysis module, setting a dynamic self-adaptive threshold by the system, realizing pollution early warning, and uploading data to a cloud platform through a remote communication module. And remote monitoring is supported. The method can be widely applied to the fields of water quality monitoring, environmental protection and pollution control, and the detection precision, the real-time performance and the intelligent level are improved.

The invention relates to the technical field of organic display data processing, in particular to a touch data processing method based on an organic display, which comprises the following steps of: monitoring a flexible deformation acceleration component and an environmental parameter change rate in real time through a dynamic trigger function, and triggering high-priority baseline calibration when a threshold value exceeds a limit; and generating a self-adaptive compensation amount matched with the current touch signal noise spectrum. And constructing a dielectric constant offset prediction model by using a long short-term memory neural network or a Kalman filter, deducing the dynamic change trend of the dielectric property of the material, and correcting a touch signal compensation coefficient in a grading manner according to the predicted offset. And a closed-loop error correction mechanism is formed based on the spatial distribution entropy reverse optimization model weight parameter and the trigger threshold boundary of the contact coordinate residual matrix. According to the method, the problem of time domain mismatch of fixed period calibration and organic material nonlinear offset is solved, the accumulation of touch coordinate analysis errors in a high-curvature deformation scene is effectively inhibited, and the touch positioning precision and the interaction response real-time performance are improved.

The invention relates to a heterogeneous honeycomb wave-absorbing structure, and belongs to the field of stealth materials. The structure is composed of a plurality of hexagonal honeycomb units comprising a plurality of different electromagnetic materials, the incident direction of electromagnetic waves mainly aims at radial incidence, large effective depth exists in the direction, and the structural layer is in uneven periodic distribution. The propagation path of electromagnetic waves in the structure is expanded, multiple reflection is easier to occur, and absorption of the electromagnetic waves is facilitated; the heterogeneous honeycomb wave-absorbing structure is divided into four layers in the radial direction, and the dielectric constant of each layer of absorbing material is in gradient change on the whole, so that the heterogeneous honeycomb wave-absorbing structure has a better impedance matching characteristic; according to the design method, the particle swarm optimization algorithm is utilized to optimize the wave-absorbing material in the optimization layer, so that the degree of freedom of the honeycomb wave-absorbing structure is increased, and the advantage of radial length is fully utilized. The heterogeneous honeycomb wave-absorbing structure provided by the invention meets impedance matching, has broadband wave-absorbing performance, and can realize good absorption of 2-18GHz electromagnetic waves, so that the heterogeneous honeycomb wave-absorbing structure has greater application potential in related fields.

The invention relates to the field of surface-mounted metasurface structure design, in particular to a design method and device for a multi-frequency transparent transmission type surface-mounted metasurface structure, and the method comprises the steps: representing a multi-layer structure of a glass surface-mounted metasurface through a cascade transmission matrix; wherein the metasurface comprises a metal layer and a dielectric layer; a corresponding transmission coefficient is calculated by using the represented cascade transmission matrix, and a theoretical optimal transmission coefficient of a target frequency band under the structure is obtained by adjusting the dielectric constant and the thickness of a metasurface dielectric layer and the equivalent impedance of a metasurface metal layer to determine an initial structure and a parameter change interval of a to-be-optimized metasurface unit; simulating to obtain a transmission coefficient under the initial structure of the metasurface; and based on the transmission coefficient under the initial structure of the metasurface, taking a theoretical optimal transmission coefficient as an optimization target, and adopting a quasi-Newton algorithm to optimize metasurface design to obtain a metasurface structure corresponding to the optimal transmission coefficient. Compared with the prior art, the invention has the advantages of greatly and stably improving the transmission performance of multiple frequency bands and the like.

The invention provides a low-dielectric glass fiber composition, a low-dielectric glass fiber and a preparation method thereof, and the low-dielectric glass fiber composition comprises the following components in molar percentage: 54 to 60 percent of SiO2, 21 to 32 percent of B2O3, 1.0 to 9.5 percent of Al2O3, 3 to 16 percent of alkaline earth metal oxide, 0.01 to 4.0 percent of ZrO2, 0.1 to 4.0 percent of TiO2, 0.01 to 2.0 percent of LiO2 and 0.5 to 5.0 percent of F2. Wherein the alkaline earth metal oxide comprises CaO and MgO, and according to the molar percentage, the CaO accounts for 0.01%-4.0%, and the MgO accounts for 0.5%-8.0%. According to the glass fiber, SiO2 and B2O3 are taken as main components of the glass, SiO2 can be taken as a network former of a glass structure, on one hand, part of B2O3 can form a [BO4] tetrahedral structure to enter a glass silica network structure so as to play a role in reinforcing a net, and on the other hand, B2O3 can effectively inhibit ion polarization so as to reduce the dielectric constant and dielectric loss of the glass fiber; according to the present invention, the specific type of the alkaline earth metal oxide is added, and the certain content of the Al2O3, the ZrO2, the TiO2, the LiO2 and the F2 is supplemented so as to further reduce the dielectric constant and the dielectric loss of the glass fiber, and the cooperative control of the components is beneficial to the improvement of the glass processing property and the guarantee of the glass fiber drawing stability.

The invention relates to a preparation method of a semiconductor structure and the semiconductor structure, and the method comprises the steps: forming a first sacrificial layer on a first metal layer structure, etching the first sacrificial layer to form a plurality of step-shaped first grooves which are arranged at intervals, and forming a second metal wire and a metal through hole with the width smaller than that of the second metal wire in the first grooves. Next, the first sacrificial layer between the adjacent second metal wires is removed to form a second groove, and the second groove is filled with a dielectric layer material to form a first dielectric layer; and after the first dielectric layer is etched until part of the first sacrificial layer on the side wall of the metal through hole is exposed, the first sacrificial layer on the side wall of the metal through hole is removed, so that a first air gap is formed between the first dielectric layer and the metal through hole, and finally, the second groove is continuously filled with the dielectric layer material, so that the top surface of the first dielectric layer is flush with the top surface of the second metal wire. Because the dielectric constant of air is far low, the formation of the first air gap reduces the capacitance between the metal interconnection structures, improves the RC delay, and improves the semiconductor performance.

The invention belongs to the technical field of aging state evaluation, and discloses a high-voltage dry-type bushing insulation aging state evaluation method based on frequency domain characteristics. According to the method, the FDS is adopted, and the aging state of the insulating material is evaluated according to the change of the complex capacitance, the complex dielectric constant, the dielectric loss factor and the like of a medium along with the frequency under a low-voltage sine alternating electric field. The FDS shows remarkable superiority in a plurality of aspects. The method comprises the following steps: firstly, measuring a dielectric constant and dielectric loss of an insulating medium in a wide frequency range by an FDS method so as to obtain response characteristics of the insulating material under different frequencies; according to the method, the frequency domain dielectric spectroscopy FDS is combined with the advantages of wide frequency range measurement, frequency domain feature recognition, comprehensive reflection of electrical characteristics and the like, so that accurate evaluation of the insulation aging state of the high-voltage dry-type bushing is realized. The safety and the stability of a power system can be improved, and faults and accidents caused by insulation aging can be reduced.

The invention belongs to the technical field of power cable fault positioning. The invention discloses a TDR power cable global fault positioning method based on multi-frequency cooperative excitation and environment adaptive correction. The method comprises the following steps: 1) multi-frequency pulse cooperative injection and signal acquisition; 2) environment parameter dynamic sensing and speed correction: embedding a miniature temperature and humidity sensor and a cable insulation state monitoring unit along the cable at an interval of 500m, and collecting laying environment temperature, humidity and insulation material dielectric constant change data in real time; constructing a dynamic speed correction formula based on a preset environment-dielectric constant correlation model; according to the method, the complex fault positioning precision is improved, the environment and scene adaptability is enhanced, and the troubleshooting efficiency is optimized.

The invention discloses a composite shielding material effect experiment data analysis method, and particularly relates to the field of material shielding effect analysis, and the method comprises the following steps: measuring key data such as dielectric constant, magnetic conductivity, conductivity and thickness of each layer of a composite shielding material through an electromagnetic performance measurement instrument; establishing an electromagnetic wave propagation model for describing propagation of electromagnetic waves in the multilayer medium based on a Maxwell equation, and defining boundary conditions of a test sample; time domain and frequency domain characteristics of an electromagnetic interference source are simulated through Fourier transform, and actual input interference is simulated. And analyzing the dynamic response of the electromagnetic wave propagation model under transient and steady-state interference signals to form an electromagnetic wave interference response propagation model. Through comparison with actual shielding effectiveness test data, model parameters are adjusted, and it is ensured that model calculation errors are within an acceptable range. A full-band shielding effectiveness prediction map of the composite shielding material is generated based on the model, and theoretical support is provided for material design and optimization.

The invention belongs to the technical field of liquid level monitoring, and relates to a liquid level monitoring method and system based on a radar liquid level meter. The current temperature of the stored substance in the target storage tank is matched with the dielectric constant, whether the dielectric constant is abnormal or not is judged accordingly, the influence of the temperature on the dielectric constant of the stored substance is considered, and errors caused by temperature changes when the radar liquid level meter monitors the liquid level are avoided; whether abnormal influence is generated on the monitoring process of the radar liquid level meter or not is evaluated from multiple dimensions through the key obstacles in the target storage tank, the limitation of single parameter analysis is broken through, measurement errors caused by obstacle abnormity can be reduced, and the stability of liquid level monitoring is ensured; whether foam interference or steam interference occurs or not when the radar liquid level meter monitors the liquid level is recognized through multiple verification modes, the accuracy of interference reason recognition is improved, the pertinence of maintenance measures is guaranteed, and the situation that the measurement precision of the radar liquid level meter is reduced due to abnormal medium characteristics is avoided.

The invention relates to the technical field of circuit component layout, in particular to a component layout system of a DC-DC power module, which obtains a candidate position range according to a first preset position range and a second preset position range, and obtains a reference distance according to an initial value set, a target value, a preset wiring width and a preset dielectric constant. According to the method, a series of possible candidate positions are generated by comprehensively considering different distance and angle combinations, so that the layout possibility of a target element on a target printed circuit board can be comprehensively explored, and an output voltage sequence and response delay time corresponding to each candidate position are obtained respectively; according to the method, performance of stability, accuracy, reliability, timeliness and the like of a circuit under different candidate positions is represented through the characteristic of the candidate positions, then the target priority corresponding to each candidate position is obtained, the candidate position corresponding to the maximum target priority is determined as the target position of the target element, the layout reasonability of the target element is improved, and the reliability of the circuit is improved. And the performance and the reliability of the whole circuit are improved.

The invention belongs to the technical field of radar wave-absorbing materials, and discloses a double-sided wave-absorbing broadband stealth composite material and a preparation method thereof. The broadband stealth composite material with the double-sided wave absorbing function comprises a non-metal-based composite material body and at least five metamaterial layers arranged in the thickness direction of the non-metal-based composite material body at intervals. The number of the metamaterial layers is an odd number, a middle metamaterial layer is arranged in the middle of the metamaterial layers in the thickness direction, and the rest metamaterial layers are symmetrically distributed on the two sides of the middle metamaterial layer; the metamaterial layer comprises conductive pattern units which are periodically arranged; the relative dielectric constant of the nonmetal-based composite material body is not greater than 10; the double-sided wave-absorbing broadband stealth composite material does not contain a metal reflecting layer. When electromagnetic waves with the frequency of 1-18 GHz vertically enter the material, the transmissivity of the material is small (smaller than-13 dB, namely smaller than 5%), and meanwhile the material has low reflectivity in a broadband. And the preparation method is simple to operate and easy to realize large-scale production.

The invention discloses an intelligent control method and device for composite material curing, equipment, a storage medium and a program product, and relates to the technical field of material processing, and the intelligent control method for composite material curing comprises the steps that the material dielectric constant of a composite material and temperature data in the curing process are obtained; determining the regional curing degree of the composite material based on the dielectric constant of the material and the temperature data; and carrying out traction speed control on the curing process of the composite material according to the regional curing degree. The curing process is reflected in real time through changes of material dielectric constants and temperature data, and the traction speed is dynamically adjusted in combination with an external thermal imaging temperature value, so that the traction speed is synchronous with the curing reaction, and the yield of pultrusion products is improved.

The invention belongs to the technical field of humidity sensors, and particularly relates to a wireless passive flexible sensor and a preparation method and application thereof. The flexible sensor comprises a flexible substrate, a planar spiral inductor, a sensitive capacitor and a humidity-sensitive film, wherein the planar spiral inductor and the sensitive capacitor are arranged on the surface of the flexible substrate; the humidity-sensitive film covers the surface of the sensitive capacitor; the planar spiral inductor and the sensitive capacitor are connected in series; the humidity-sensitive film is composed of a mono-substituted carboxyethyl viologen compound. According to the invention, the monosubstituted carboxyethyl viologen compound has good hydrophilicity and has the characteristic that the dielectric constant changes along with the content of adsorbed water molecules, and the monosubstituted carboxyethyl viologen compound is applied to the humidity-sensitive film, so that the sensitivity of a sensor for detecting humidity is improved; meanwhile, wireless transmission of signals is achieved in an electromagnetic coupling mode; the flexible wireless passive sensor provided by the invention can be easily placed in a narrow closed space and can precisely monitor the environment humidity.

The present invention relates to a thin film modification composition, a method of forming a thin film using the thin film modification composition, a semiconductor substrate including the thin film, and a semiconductor device including the semiconductor substrate. According to the present invention, by using a thin film modification composition consisting of a film growth / film quality improvement compound having a predetermined structure and a solvent with a specific dielectric constant, the growth rate of a deposition film may be appropriately reduced in a vacuum-based thin film process. Thus, even when forming a thin film on a substrate with a complex structure, step coverage and the thickness uniformity of a thin film may be greatly improved, the efficiency of etching a film may be improved, and impurity contamination may be significantly reduced.

The embodiment of the invention provides a microresonator and a preparation method of the microresonator, the microresonator can be obtained by connecting an MIM plate capacitor and an inductor of a planar coil structure, and an upper electrode, a lower electrode and the inductor of the MIM plate capacitor and a microstrip line connecting the capacitor and the inductor are all prepared from superconducting materials. A dielectric layer of the MIM plate capacitor can be prepared by adopting an ALD technology, a dielectric film grown by adopting the ALD technology is very compact and has very good thickness uniformity, a relatively high dielectric constant can be realized, and the quality factor of the microresonator can be remarkably improved by combining the zero resistance characteristic of a superconducting material; and the miniaturization of the microresonator can be realized. Moreover, in the preparation process, the three layers of thin films for forming the capacitor and the inductor are formed through deposition firstly, and then the three layers of thin films are patterned layer by layer, so that introduction of excessive impurities can be avoided, interlayer contact can be optimized, and the risk of electric leakage can be reduced.

An antenna is provided. The antenna includes a feed line structure; a first low dielectric constant layer on the feed line structure; a first flexible layer on a side of the first low dielectric constant layer away from the feed line structure; a phase shifter on a side of the first flexible layer away from the first low dielectric constant layer; a first ground plate on a side of the phase shifter away from the first flexible layer; and a radiating plate on a side of the first ground plate away from the phase shifter. The first low dielectric constant layer has a dielectric constant in a range of 1.5 to 3. The first flexible layer has a Flexural modulus in a range of 0.01 to 10.0.

The invention discloses an oil storage tank oil-water interface measurement system and method and a storage medium, and relates to the technical field of oil-water interface measurement, and the system comprises a data acquisition module, a data processing module, a decision support module and a data security module. According to the oil-water interface measuring system and method for the oil storage tank and the storage medium, a three-dimensional sensing network (distributed sensor network) is constructed by adopting a pressure sensor array and phased array ultrasonic scanning technology and combining dielectric property detection of a microwave dielectric constant sensor; the pressure, the dielectric constant, the liquid level and the vibration data in the tank body are obtained, basic data are provided for subsequent processing, the comprehensiveness of data obtaining can be improved through the sensing network, the pressure data are dynamically calibrated through Takagi-Sugeno fuzzy logic, the influence of temperature drift is effectively eliminated, and the accuracy of data obtaining is improved. The ultrasonic signals are subjected to feature enhancement through the generative adversarial network, and the emulsion layer boundary is accurately recognized.

The present invention provides a divinylbenzylfluorene and a preparation method and application thereof, a divinylbenzylfluorene hydrocarbon resin and a preparation method and application thereof, and relates to the technical field of high-frequency substrate materials. The divinylbenzylfluorene hydrocarbon resin prepared by using one or a mixture of any proportion of 9,9-bis(2-vinylbenzyl)-9H-fluorene and 9,9-bis(4-vinylbenzyl)-9H-fluorene provided by the present invention as raw materials has very low dielectric constant and dielectric loss tangent, and the higher the content of 9,9-bis(2-vinylbenzyl)-9H-fluorene, the smaller the dielectric loss tangent of the divinylbenzylfluorene hydrocarbon resin; moreover, the solubility of 9,9-bis(2-vinylbenzyl)-9H-fluorene and 9,9-bis(4-vinylbenzyl)-9H-fluorene provided by the present invention in toluene and 2-butanone is high, and has good application prospects as a cross-linking agent of the main resin or olefin resin component of a high-frequency substrate.

The invention relates to the technical field of ceramic substrates, and provides a low-dielectric-constant multilayer ceramic substrate and a preparation method thereof. The low-dielectric-constant multilayer ceramic substrate comprises the following components in parts by weight: 100 parts of aluminum oxide, 4-8 parts of a sintering aid, 8-16 parts of silicate, 3-6 parts of copper oxide, 3-5 parts of a dispersing agent, 6-12 parts of a binder and 70 parts of a solvent, the silicate comprises magnesium aluminum silicate and zirconium silicate in a weight ratio of (1.5-9): 1. According to the technical scheme, the problem that the bending strength of the multi-layer ceramic substrate is poor in the prior art is solved.

The invention discloses spherical silicon dioxide, a high-frequency high-speed copper-clad plate and a preparation method of the spherical silicon dioxide. The dielectric constant Dk of the spherical silicon dioxide is 3.5 F / m-4. 0F / m, the dielectric loss Df is 0.0001-0.005, the amorphous state proportion is larger than or equal to 99%, the spheroidization rate is larger than or equal to 99%, and the porosity is 0.1%-2%. During preparation, the hydrolysis degree is controlled till partial polycondensation is achieved, then under the oxygen introduction condition, pre-oxidation is conducted at the low temperature to remove alkyl, gradient calcination is conducted at the high temperature, local crystallization influence and defect influence caused by powder spontaneous combustion are prevented, meanwhile, viscous bodies in the microspheres are accurately controlled to flow to fill nanoscale pores, and the particle size is reduced. The spherical silicon dioxide with high purity, high spheroidization rate and low dielectric loss is obtained, the dielectric property of the high-frequency and high-speed copper-clad plate can be met, and the high thermal stability and high reliability of the high-frequency and high-speed copper-clad plate are improved.

The invention provides a method and a system for detecting construction flatness and compactness, which are applied to the field of measurement data processing. The compaction degree in the construction process is detected in real time on the basis of the preset electromagnetic induction sensor of the road roller, the problem that construction parameters cannot be adjusted in time by relying on sampling inspection after construction is completed in a traditional method is solved, electromagnetic parameters (such as electrical conductivity, dielectric constant and magnetic conductivity) are collected and matched with the compaction state of the construction ground, and the construction quality is improved. According to the method, the soil compaction condition is evaluated in real time, when insufficient compaction is found, the additional rolling times are automatically calculated, and the operation parameters of the road roller are dynamically adjusted according to the compaction distribution thermodynamic diagram, so that the construction precision and efficiency are improved, the condition of excessive compaction or insufficient compaction can be avoided, rework and resource waste are reduced, and the construction efficiency is improved. And real-time data feedback and automatic adjustment functions are provided, and intelligent management of the construction process is realized, so that the construction quality and the resource utilization rate are greatly improved.