Abstract: In one aspect, a preparation method for ferric phosphate includes the following steps: (a) feeding a ferrous sulfate solution and a phosphate solution including hydrogen peroxide simultaneously into a first reactor for mixing and reacting to obtain nucleated ferric phosphate; wherein a molar ratio of iron element to phosphorus element in the feeding process is 1:1, and a stirring speed is 500-600 r/min; (b) discharging the nucleated ferric phosphate to a second reactor for growth to obtain amorphous ferric phosphate slurry, and post-processing the amorphous ferric phosphate slurry to obtain the high tap density ferric phosphate; wherein a stirring speed is 120-150 r/min. The first reactor is a small-volume reactor, and the second reactor is a large-volume reactor.

Abstract: The invention relates to a method for preparing nicotinamide mononucleotide by using nicotinamide as a raw material, which comprises: in acetonitrile, dichloromethane, 1,2-dichloroethane or liquid sulfur dioxide as a solvent, allowing nicotinamide and tetraacetyl ribose to react as catalyzed by trimethylsilyl trifluoromethanesulfonate or tin tetrachloride, adjusting a pH value thereof to 3-5, adding a sodium methoxide solution thereto to react at ?15° C. to 5° C., adjusting a pH value thereof to 3-5, and subjecting the reaction mixture to microfiltration and nanofiltration using a membrane concentrator, thereby obtain a nicotinamide ribose solution; allowing the nicotinamide ribose solution to react as catalyzed by nicotinamide ribokinase in the presence of Mg ions, ATP and a buffer, thereby obtaining nicotinamide mononucleotide.

Abstract: In one aspect, a preparation method of iron phosphate includes: mixing pyrite cinder and an sulfite evenly in water to obtain a first mixed system; adding phosphoric acid and a buffer to the first mixed system to perform a leaching reaction; performing a first solid-liquid separation on a slurry obtained from the leaching reaction to obtain a first filtrate and a first residue; introducing air into the first filtrate and then performing a first stirring reaction on the first filtrate; performing a second solid-liquid separation on a slurry obtained from the first stirring reaction to obtain a second filtrate and a second residue; and calcining the second residue to obtain iron phosphate.

Abstract: A speaker includes a frame, a vibration assembly and a magnetic circuit assembly. The vibration assembly is assembled on the frame. The magnetic circuit assembly is assembled on the frame. The vibration assembly includes a voice coil and a piezoelectric element, the voice coil and the piezoelectric element are arranged coaxially, and the voice coil is between the piezoelectric element and the magnetic circuit assembly.

Abstract: In one or more embodiments, a chip may be formed with a first set of contacts on a first surface layer and a second set of contacts on a second surface layer opposite the first surface layer. The first set of contacts may be communication (IO) contacts and the second set of contacts may be power contacts, including ball grid array (BGA) balls and capacitors. A PCB may be configured with a chip receiving area capable of receiving the second set of contacts for various chips.

Abstract: The present disclosure provides a high-rate lithium iron phosphate positive electrode material comprising lithium iron phosphate and carbon coated on a surface of the lithium iron phosphate, wherein a primary particle of the material has a particle size of 30-70 nm. The material of the present disclosure has a small and uniform primary particle size, no large single crystal particles, and a high specific surface area, and the battery prepared with the material has a high capacity, good cycle performance, excellent rate performance and low temperature performance. The present disclosure also provides a method for preparing the high-rate lithium iron phosphate positive electrode material, which has a simple process, is environmentally friendly, does not need precursors or expensive equipment, and has low cost.

Abstract: The present invention provides benzocyclobutene resins containing olefinic bonds and preparing methods thereof, which relate to a technical field of high-performance resins. The resin structural formula of the present invention is: wherein R1, R2 and R3 are benzocyclobutenyls or hydrogen atoms, at least one of R1, R2 and R3 is a benzocyclobutenyl; R4, R5 and R6 are alkyls, vinyls or hydrogen atoms and are identical with each other; the preparing method thereof is to prepare the benzocyclobutene resin by reacting unsaturated resins of different molecular weights with halogenated benzocyclobutene through Heck reaction. The conditions for preparing the benzocyclobutene resin are mild and easy to produce, and the resin formed by ring-opening polymerizing and curing through further heating which has high crosslinking density, good heat resistance, good resin smoothness, and extremely low dielectric constant and dielectric loss performance, so it is a good photoelectric material.

Abstract: A message transmission method for a roadside equipment includes the following steps. A plurality of external sensor information is received. A road intersection sign phase information and a road map information are inputted. An object position analysis, a speed analysis, and an sign analysis in object moving direction are performed based on the external sensor information, the road intersection sign phase information, and the road map information, and a classification of dangerous objects in different groups is outputted. According to a current transmission bandwidth limitation and the classification of the dangerous objects, a dangerous object message with a higher classification of the dangerous objects is preferentially selected and transmitted within available transmission bandwidth.

Abstract: The present disclosure relates to a method for preparing ferroboron alloy-coated lithium iron phosphate, comprising: preparing ferrous phosphate and lithium phosphate, then mixing ferrous phosphate and lithium phosphate and adding a hydrazine hydrate solution to obtain a mixture which is then subjected to grinding, drying and then calcining to obtain a calcined mateiral, adding pure water to the calcined material and grinding the calcined material in water to obtain a slurry, to which PEG, ferrous sulfate crystals and disodium EDTA are added and stirred to dissolve, then adding a sodium borohydride solution and a sodium hydroxide solution while stirring and maintaining a pH in the process at 8.5-10.5, reacting for 15-30 min to obtain a product, and filtering, washing and vacuum drying the product to obtain the ferroboron alloy-coated lithium iron phosphate. The method may reduce interface resistance while improving conductivity, corrosion resistance, oxidation resistance and density of the product.

Abstract: The present disclosure relates to an iron-based composite phosphate cathode material and a preparation method thereof, and a cathode plate and a sodium ion battery. The method for preparing an iron-based composite phosphate cathode material includes: uniformly mixing a sodium source, a phosphorus source, a carbon source, and water, and then mixing same with iron phosphate to obtain a first mixed system; and grinding the first mixed system to obtain a second mixed system, and then drying and sintering same. In the first mixed system, the total mass of Na element, Fe element, (PO4)3?, and the carbon source is 30%-40% of the mass of the water; and the viscosity of the second mixed system is greater than or equal to 300 Pa·S. According to the method, a solid reactant can be solubilized during grinding, the iron-based composite phosphate cathode material is uniformly sized nano spherical particles.

Abstract: A thermoplastic composition includes: a transparent thermoplastic resin; from about 0.1 wt % to about 2 wt % of a mold release agent including pentaerythritol tetrastearate (PETS); and from 0.01 wt % to about 5 wt % of a stabilizer component. The PETS is derived from an aliphatic carboxylic acid having less than 50 wt % content of C18 or longer alkane chains. The thermoplastic composition has improved transparency properties as compared to comparative compositions including PETS derived from an animal source.

Abstract: The present disclosure relates to a cathode material for a lithium ion battery, and a preparation method therefor. The cathode material is a Ti3C2 MXene-coated lithium manganese iron phosphate material, Ti3C2 MXene being uniformly coated on surfaces of lithium manganese iron phosphate nanoparticles and forming an electrically conductive mesh. The preparation method therefor includes: adding a phosphorus source and a lithium source to a deionized water/PEG solution, to form a suspension A; adding a manganese source, an iron source, an antioxidant, and Ti3C2 MXene to deionized water to form a suspension B; adding the suspension B to the suspension A dropwise under continuous stirring, to form a mixed solution; then transferring the mixed solution to a hydrothermal reactor to maintain temperature; and after reaction is complete, centrifugally separating a product, and then performing washing, drying, and annealing to obtain the material.

Abstract: The present disclosure relates to a sodium ion battery cathode material, and a preparation method and application therefor. The method for preparing a sodium ion battery cathode material of the present disclosure includes the following steps: (A) grinding a mixture of sodium borohydride and ferric manganese hydroxide to obtain first slurry, and performing spray drying and calcination on the first slurry to obtain a first calcinated material; and (B) grinding a mixture of the first calcinated material, a carbon source, a vanadium source, sodium bicarbonate, and water to obtain second slurry, and performing spray drying, calcination, crushing, sieving, and iron removal on the second slurry to obtain a sodium ion battery cathode material. The method is simple in step and low in cost, and the prepared sodium ion battery cathode material has the characteristics of being good in conductivity, high in capacity, high in energy density, etc.

Abstract: The present disclosure provides a sodium battery cathode electrode material, which has a chemical formula as follows: xNaMBO3·yNa2Ti3O7·zNa3V2(BO3)3/C, wherein the mole number ratio of x to y to z is 0.94-0.96:0.02-0.03:0.02-0.03; M is Fe and Mn, and the mole number ratio of Fe to Mn is 8-9:1-2; and the mass fraction of carbon in the sodium battery cathode electrode material is 1.2% to 1.5%. The sodium battery cathode electrode material provided by the present disclosure is high in capacity, high in voltage platform, stable in structure and high in cycle performance, and the preparation method is simple, low in cost and short in process flow.

Abstract: The present disclosure provides a lithium iron phosphate positive electrode material having a high tap density, a method for preparing the same and applications thereof. The method comprises: grinding and spraying in sequence a mixed solution of an iron source, a lithium source, a carbon source and an ion doping agent to obtain a precursor powder; and sintering the precursor powder at a high temperature to obtain the lithium iron phosphate positive electrode material. The method has a simple and controllable process and high productivity. The lithium iron phosphate positive electrode material has excellent characteristics such as a high tap density, and a high specific capacity; and due to its unique morphology, the material may be used by being blended with a ternary material, so that the lithium iron phosphate battery prepared has safety while having the characteristics of ternary batteries such as a high energy density and low temperature resistance.

Abstract: A high pitch enhanced passive radiator is adapted to be utilized in a passive radiator speaker. The high pitch enhanced passive radiator includes a shell, a woofer, and the passive radiator speaker. The shell has a first slot and a second slot. The woofer is connected to the first slot. The passive radiator speaker is connected to the second slot and includes a flange, a piezoelectric speaker, and a counterweight plate. The piezoelectric speaker is connected to the flange. The projected area of the counterweight plate and the projected area of the piezoelectric speaker at least partially overlap with each other.

Abstract: A crosstalk-suppressing image sensor includes a semiconductor substrate, an opaque layer, and a spectral filter. The semiconductor substrate includes a photodiode therein and is located beneath a light-exposure region of a back surface of the semiconductor substrate. The opaque layer is on the back surface, partially covers the light-exposure region, and has an opaque-layer thickness perpendicular to an image-plane direction parallel to the back surface. The spectral filter is adjacent to the opaque layer in the image-plane direction, and partially covers the light-exposure region.

Abstract: A global phase tracking and predicting method suitable for a twin-field quantum key distribution system is provided. A time-aware sequence to sequence network (S2S) specially mounted on a field-programmable gate array (FPGA) is designed. In the global phase tracking and predicting method, global phase changes at a plurality of subsequent time points are tracked and predicted according to two-phase scan count and external environmental parameters acquired in real time, and the tracking and prediction results are then used to compensate phase disturbance in real time, thereby ensuring long-time global phase stability.

Abstract: A composition includes a polymer base resin, a fiber filler including a sizing agent component, and an additive. The sizing agent component includes a sizing agent and a reactive aid. The composition exhibits a notched Izod impact strength of 140 to 190 J/m, and an unnotched impact strength of 500 to 1200 J/m when tested in accordance with ASTM D256.

Abstract: The present disclosure relates to the technical field of sodium batteries, and in particular provides a cathode material for sodium batteries and a preparation method thereof. The cathode material for sodium batteries according to the present disclosure is carbon layer-coated sodium iron manganese titanium silicate, where the sodium iron manganese titanium silicate has a molecular formula of NaqFexMny(TiO2)z(SiO4)m, where 1.5?q?2.5, 0.7?x?0.8, 0.2?y?0.3, 0.07?z?0.5, and 0.5?m?1.5. Compared with the prior art, the cathode material for sodium batteries provided by the present disclosure improves the capacity of resultant batteries by doping with titanium and manganese as well as carbon coating.