43results about How to "Promote decomposition" patented technology

The invention relates to the technical field of organic fertilizers and planting of watermelons and muskmelons, and provides a special fertilizer for milk irrigated watermelons and muskmelons and a double-stubble planting method for sweetness enhancement of milk irrigated watermelons and muskmelons. The special fertilizer for the milk irrigated watermelons and muskmelons comprises black goat manure, sophora alopecuroide, sesame seed meal, bran, organic fresh milk, brown sugar and zymophyte. The black goat manure is pulverized into powder by a pulverizer, the sophora alopecuroide is pulverizedinto 1 cm to 2 cm, and the ratio of the black goat manure, the sophora alopecuroide, the sesame seed meal, the brans, the organic fresh milk, the brown sugar and the zymophyte is 2700-3200: 80: 50: 150: 5: 1. The double-stubble planting method for sweetness enhancement of the milk irrigated watermelons and muskmelons comprises the following steps: selection of a nursery seedling plate and soil, cleaning and germination accelerating of seeds, soil preparation, transplanting, irrigation, topdressing, shaping and forking of watermelon and muskmelon vines and fruit bearing of the watermelons and the muskmelons. The problems that in an existing watermelon and muskmelon planting process, soil nutrients are damaged due to the fact that chemical fertilizers are used for a long time, and the sweetness of melons is reduced are solved.

The application provides a kind of biological organic fertilizer efficient aerobic fermentation device, it relates to organic fertilizer fermentation technical field, including: base;The base is fixed with support, the upper portion of support is hinged with baffle, and support is installed with screw rod lifting seat A and screw rod lifting seat B by bolt, and the screw rod in screw rod lifting seat A and screw rod lifting seat B is connected with the lower end of baffle by pin shaft, and the input shaft of screw rod lifting seat A is connected with the input shaft of screw rod lifting seat B with connecting rod;The application integrates stirring, oxygen supply, fungicide spraying, material conveying, waste gas treatment and other multiple functions, forms complete fermentation process system, through the collaborative work of each hydraulic rod, motor and transmission mechanism, can be flexibly adjusted according to different material characteristics and fermentation process parameters, is suitable for efficient fermentation production of various biological organic fertilizer, has strong environmental adaptability and process expandability, helps to improve the automation level and product quality stability of organic fertilizer production.

This utility model discloses an expansion device for an optical cable junction box, including an expansion box and an optical splitter assembly. The expansion box has a mounting base slidably disposed inside, with a connecting groove on the mounting base. Two sliding grooves are provided on the side end of the connecting groove, and sliding plates are slidably disposed inside each of the two sliding grooves. Screws are threadedly connected to the mounting base at positions corresponding to the two sliding grooves, with the side ends of the screws rotatably connected to the side ends of the sliding plates. A retaining plate is fixedly connected to the side end of the optical splitter assembly. A connecting seat is fixedly connected to the bottom end of the optical splitter assembly, inserting into the connecting groove. A retaining slot is provided on the side end of the connecting seat at positions corresponding to the two sliding grooves, and two retaining plates are respectively inserted into the two retaining slots. This facilitates the removal of the optical splitter assembly from the expansion box, allowing for easy disassembly and assembly of internal equipment such as optical splitters, ensuring efficient maintenance and replacement, and improving its practicality.

This solution relates to the coatings field and proposes an aqueous nano-dispersion of far-infrared negative oxygen ion material. By weight, it comprises: 300-350 parts water; 35-45 parts wetting agent; 40-60 parts dispersant; 25-35 parts defoamer; 35-45 parts multifunctional additive; 5-7 parts thickener; 400-600 parts activated far-infrared negative oxygen ion material; 1-3 parts accelerator; and 3-5 parts shielding agent. This solution designs a multi-component synergistically promoting activated far-infrared negative oxygen ion material, which can improve the hemispherical spectral emissivity in the 4-14μm band, even reaching above 0.95 in the key 8-12μm band, effectively promoting formaldehyde decomposition with a long-lasting effect, while also improving antibacterial properties.

The utility model discloses a detachable aeration device, including the air intake main pipe of setting in the activated sludge pool upper end, the branch pipe of vertical setting in the air intake main pipe below, the aeration pipe of setting in the branch pipe lower extreme, be equipped with the aeration micropore on the aeration pipe. Can solve the problem of the micropore on the existing aeration device easy to block and not easy to replace and clean after blocking.

The present application relates to sewage treatment technical field, specifically to a kind of acrylonitrile sewage treatment device, comprising: microbial purification tank, exhaust mechanism, the exhaust mechanism has two and symmetrically set in the two sides of the inner wall of microbial purification tank width direction, the exhaust mechanism includes the cavity plate fixedly connected in the inner wall of microbial purification tank. By cavity plate, partition block and air separation assembly in exhaust mechanism, air can be injected and extracted into microbial purification tank, so as to provide corresponding purification environment for aerobic microorganism or anaerobic microorganism to purify sewage, and then realize that when injecting air, air exposure area and immersion area can inject air into microbial purification tank simultaneously to provide sufficient oxygen for aerobic microorganism to purify sewage, help its efficient decomposition of pollutants in sewage, while when extracting air, air separation assembly disconnects the communication of air exposure area and immersion area, so that suction airflow is only discharged from air exposure area, avoid sewage from flowing out with cavity plate, while avoiding suction airflow from immersion area to interfere with anaerobic environment in tank.

This invention discloses a method for the biological drying of sludge, comprising the following steps: baking biomass materials, mixing the resulting baked product with sludge, biochar materials, and a conditioner for biological drying, thereby completing the sludge drying process. In this invention, by biologically drying the mixture of baked product, sludge, biochar materials, and conditioner, not only can the self-generated heat within the system be used to effectively dewater the sludge in a very short time, but the bioavailability of the microbial carbon source can also be improved, effectively reducing the generation of polluting gases. This method can effectively reduce the emission of polluting gases while achieving rapid dewatering. It has advantages such as simple process, low treatment cost, low energy consumption, high drying efficiency, good dewatering effect, low polluting gas production, and low content of toxic and harmful components in the dried product. It can solve the problems of biomass resource waste and pollution, achieve sludge reduction and resource utilization, and has high returns and good application prospects.

This utility model belongs to the field of evidence extraction technology and discloses a device for extracting combustion accelerants from combustion residues. It includes a base plate, on which a water bath heating chamber, a vacuum suction device, and a controller are mounted. A sealed chamber is installed inside the water bath heating chamber. A one-way air inlet valve is located at the end of an air inlet pipe on one side of the sealed chamber, and a one-way exhaust valve on the other side of the sealed chamber is connected to the vacuum suction device via a flexible hose. An activated carbon filter is installed in a filter assembly located in the middle of the flexible hose. Water bath heating ensures more uniform heating of the sealed chamber, which is beneficial for the decomposition of combustion accelerants in the combustion residues. The vacuum suction device reduces the air pressure inside the sealed chamber, lowers the volatilization and decomposition temperature of the combustion accelerant, and increases the extraction rate of the device. Under the action of the vacuum suction device, substances volatilized from the residues are discharged from the sealed chamber and adsorbed by the activated carbon filter, thereby collecting more combustion accelerant substances and making the extraction effect of the device more ideal.

The application discloses a yarn tail reserving device, which comprises a frame body, a groove cylinder rotatably connected to the frame body, a thread cylinder in contact with the circumferential surface of the groove cylinder, a motor drivingly connected to the groove cylinder to drive the groove cylinder to rotate and drive the thread cylinder to rotate, a cover body arranged outside the circumferential surface of the groove cylinder, and a thread hanging assembly comprising a thread hanging column protruding or retracting from the surface of the cover body and away from the surface of the groove cylinder. The driving device is directly or indirectly drivingly connected to the thread hanging assembly to drive the thread hanging column to protrude or retract from the surface of the cover body and away from the surface of the groove cylinder. According to the technical scheme, the yarn tail and the thread roll can be separated from each other, the yarn tail is reserved, the yarn head of the next thread roll is connected to the yarn tail, and the continuity of subsequent production is improved.

This invention discloses a digestion apparatus for determining the content of polyisoprene, comprising a steam generating flask, with a conduit connected to the top of the steam generating flask, and a Claisen inductor connected to the end of the conduit away from the steam generating flask. This digestion apparatus provides a reaction site through the steam generating flask, generating stable steam, which is then provided with a uniform heat source via a heating seat to accelerate sample digestion and prevent localized overheating. The steam is then introduced into the Claisen inductor via the conduit. The Claisen inductor enables multifunctional connections, preventing sample loss, improving reaction efficiency, providing safety protection, preventing harmful gas leakage, improving reaction control precision, and ensuring optimal experimental conditions. The digestion flask provides a sealed, high-temperature and high-pressure resistant reaction environment, promoting the complete decomposition of organic matter in the sample and ensuring reaction uniformity and safety.

This invention discloses a method for preparing magnesium aluminum spinel using calcium aluminate filter residue from water treatment agents, belonging to the field of magnesium aluminum spinel synthesis technology. The method involves drying the calcium aluminate filter residue from water treatment agents and then calcining it at a low temperature of 400-800℃ to obtain an intermediate material. This intermediate material is then mixed with a magnesium source and rare earth oxides and ball-milled to obtain a mixed powder. The mixed powder is then pressed into pellets and sintered at a high temperature of 1400-1700℃ to obtain magnesium aluminum spinel. This method uses calcium aluminate filter residue from industrial solid waste water treatment agents as the main raw material, fully utilizing its raw material characteristics to prepare a high-purity, high-density magnesium aluminum spinel product, achieving high-value utilization of waste. Furthermore, this method is simple to operate, low-cost, and easy for industrial production.

The utility model discloses a kind of castor root rhizome protective nets for mine soil remediation, including edge rope and net body, the edge rope is fixedly connected to the outside of net body, the connecting place of net body is equidistantly fixedly connected with several degradable fertilizing blocks;The degradable fertilizing block is composed of first casing, microbial fertilizer and second casing, the first casing and second casing are same cylindrical hollow structure, the first casing and second casing are fixedly connected by adhesive, the microbial fertilizer is located in first casing and second casing, the first casing and second casing are PBAT plastic material, the net body is located at the connecting end of first casing and second casing. Soil is maintained by net body, reduce soil erosion, degradable fertilizing block can release microbial fertilizer in soil after natural degradation, supplement the required nutrients of castor in soil for next year growth, and promote the decomposition of organic matter in soil, improve the repair effect to mine soil.

The application discloses a heat-triggered water-based carbodiimide crosslinking agent composition and application thereof. By introducing a latent acid and setting an alkaline environment during storage, the hydrolysis of carbodiimide and the pre-reaction of carbodiimide and carboxyl are simultaneously inhibited from the kinetic aspect, and the system is 'frozen' in a stable state. When used, the latent acid is triggered to decompose by heating, and the system pH is suddenly reduced to acidity by instantaneous release of protons, which not only quickly protonates and activates the carbodiimide, but also creates an optimal kinetic window in which the reaction rate of carbodiimide and carboxyl is much faster than the hydrolysis reaction, thereby accurately, synchronously and efficiently guiding the reaction path to the target crosslinking direction, and realizing the unification of'stable storage' and 'on-demand efficient reaction' in a single component.

The utility model discloses a kind of biogas slurry fertilizer aerobic fermentors, involve biogas slurry processing technical field.Its structure includes flatbed cart and the fermentation tank, air pump and sewage pump installed on flatbed cart;S-shaped arrangement's aeration gas guide pipe is arranged in the bottom of fermentation tank, and aeration gas guide pipe one end is connected with air pump air outlet after being through fermentation tank;Aeration gas guide pipe is equipped with several aeration heads;One row of hanging rods is fixed between one relative inner wall of fermentation tank upper end portion;One row of fiber bundle fillings is installed on hanging rod.The utility model is combined by flatbed cart, fermentation tank, air pump and sewage pump to strengthen microbial decomposition, improve biogas slurry quality and safety, guarantee biogas tank stable operation, promote resource utilization and handle substandard biogas slurry in time, maintain biogas tank inner microbial environment balance, guarantee biogas continuous and stable generation;Equipment is flexible and efficient, and strong adaptability, and operation is simple and convenient, maintenance cost is low, effectively solve rural biogas slurry processing problem.

The present application belongs to the technical field of nanowire preparation, and provides a preparation method of germanium nanowire. The preparation method uses non-toxic and non-polluted green ionic liquid 1-ethyl-3-methyl imidazole trifluoromethyl sulfonic acid ([EMIm]TfO) as a solvent, and GeCl4 as an electrolyte. The [EMIm]TfO ionic liquid is easy to decompose in the electrochemical reaction process due to weak cation-anion interaction, and the chloride ion in GeCl4 is also easy to separate from the molecule. Therefore, in the process of electrodeposition, the TfO generated after the decomposition of the [EMIm]TfO ionic liquid combines with GeCl4 to generate a GeClx / TfO complex, the GeClx / TfO complex is adsorbed on the ITO substrate to form a liquid seed; then, the GeCl4 precursor is electrochemically reduced and dissolved into the liquid seed; finally, the supersaturation of germanium in the liquid seed triggers the final crystal nucleation and the growth of nanowire. ‑ x ‑ ‑ ​​​​

This utility model discloses a sludge reduction device based on porous packing, belonging to the field of sludge reduction technology. It includes an inlet pipe, a reduction mechanism fixedly connected to its outer surface, a filter assembly movably connected to the inner cavity of the inlet pipe, and an outlet pipe fixedly connected inside the reduction mechanism. A valve is installed on the outer surface of the outlet pipe. Through two aerators and a stirring assembly, air can be supplied to the reaction tank to form a stable aerobic environment, providing sufficient oxygen for the aerobic metabolism of microorganisms and accelerating the decomposition of organic matter in the sludge. Simultaneously, the water flow disturbance generated by aeration and the stirring action of the stirring assembly promote full contact between the wastewater and the biofilm on the porous packing, significantly improving mass transfer efficiency. In this environment, microorganisms can more fully utilize the organic matter in the wastewater, accelerating their own metabolism and sludge decomposition, thus improving sludge reduction efficiency, effectively reducing subsequent sludge treatment costs and environmental pressure, and enhancing the practicality of the device.

The application discloses a kind of micro-nano hard ceramic phase composite reinforced laser cladding nickel-based wear-resistant coating and its preparation method and application.The preparation method uses discharge plasma ball milling process to mix micro-nano hard ceramic and Ni-based metal powder for modification treatment, utilizes the synergistic effect of plasma activation and mechanical ball milling force of pulse discharge, effectively breaks the nano ceramic phase agglomerate, realizes the uniform dispersion distribution of nano ceramic phase in composite powder;By adopting the optimization of laser cladding process parameters, and cooperating with ultrasonic vibration auxiliary and / or pulse laser composite energy input, etc. Regulating means, prepare the nickel-based wear-resistant coating with uniform and dense structure, high hardness, excellent wear resistance and good metallurgical bonding with base material, which can meet the service requirements of mining machinery, oil drilling and production, metallurgical roller and other harsh working conditions, and has wide application prospect.

This invention discloses a 5-fluoro-3-methyl-2,4-dinitroaniline compound, its preparation method, and its applications, belonging to the field of compound preparation technology. The compound is prepared by the following method: 1,3-difluoro-5-toluene is reacted at a high temperature of 100–160°C using fuming sulfuric acid and sodium nitrate as nitrating agents for 6–8 hours. After cooling, the mixture is precipitated with ice water at room temperature, filtered, washed, and dried to obtain 1,5-difluoro-3-methyl-2,4-dinitrobenzene. The 1,5-difluoro-3-methyl-2,4-dinitrobenzene is dissolved in tetrahydrofuran, and then slowly added dropwise with an aqueous ammonia solution, followed by natural evaporation to obtain 5-fluoro-3-methyl-2,4-dinitroaniline (DFDNTN). The 5-fluoro-3-methyl-2,4-dinitroaniline obtained by this invention has a melting point (127.5℃) that is higher than the ideal melting point range, but it can be used as a single component in eutectic compounds. It has a relatively high decomposition temperature of 295℃, an impact sensitivity of 35J, and a friction sensitivity of not less than 360N. The detonation velocity is 7210 m / s. ‑1 Its explosive pressure is 21.14 GPa, which is better than that of TNT. It is expected to become a cast-carrier explosive that can replace TNT.

This utility model relates to the field of biomass baking technology, specifically disclosing a biomass baking device, including a base plate and a baking tank. A flat plate is fixedly connected to the outer wall of the baking tank above the base plate. A high-efficiency exhaust gas treatment mechanism is provided above the base plate. The high-efficiency exhaust gas treatment mechanism includes a heat-conducting bend connected to the upper end of the baking tank. A condenser sleeve is provided on the outer wall of the heat-conducting bend. The lower and upper sides of the outer wall of the condenser sleeve are respectively connected to an inlet pipe and an outlet pipe. After cooling, the exhaust gas enters the filter box through a horizontal pipe to complete gas-solid separation. Then, it is pressurized by a gas pump and injected into an acid gas treatment box. The acid gas is neutralized by NaOH solution, thereby achieving the effect of deacidification of the exhaust gas. The exhaust gas is heated to the catalytic reaction temperature by a heating tube and an oxygen supply tube. At the same time, oxygen is injected into the oxygen supply tube, which promotes the oxidation of CO in the exhaust gas to CO and the decomposition of VOCs into CO and H2O, thereby facilitating the decomposition of organic matter such as CO and VOCs and achieving the complete harmless treatment of organic matter.

This invention relates to the field of wastewater treatment technology and discloses a high-efficiency filtration treatment device for industrial wastewater, including a lower filter tank. An upper filter tank is connected to the upper surface of the lower filter tank via a flange. A limiting cylinder is fixedly connected to the upper surface of the upper filter tank. A mounting base is sleeved on the inner surface of the limiting cylinder. A U-shaped electric heating tube is fixedly connected to the lower surface of the mounting base. In this invention, the U-shaped electric heating tube can heat the wastewater to promote pollutant decomposition and separate oily substances. During the heating process, a temperature monitoring gauge can monitor the internal temperature of the lower and upper filter tanks in real time, facilitating precise temperature control and gradient heating to improve pollutant decomposition efficiency. A stirring paddle agitates the wastewater, promoting its flowability and improving the uniformity of heating, thus enhancing the pollutant decomposition effect.

The application relates to a sodium supplement, a preparation method of the sodium supplement, a sodium supplement positive electrode and a preparation method of the sodium supplement positive electrode and a sodium ion battery. x MO4, wherein x is 3-4.5, the M comprises a first element, the first element is any one or a combination of at least two of Co, Fe, Mn, Cr, Ti, V, Zr, Mo or W; and the sodium supplement is a triclinic crystal structure. The sodium supplement comprises a triclinic crystal structure of Na x MO4, the crystal structure of the sodium supplement is unstable, is easy to decompose at a low voltage, can be matched with most positive electrode materials, the decomposition product is an oxide, has no negative effect on the positive electrode material and has a high theoretical specific capacity, therefore, the sodium supplement is a high-efficiency sodium supplement, has good compatibility with a sodium ion positive electrode active material, and can improve the capacity and cycle stability of the sodium ion battery. x MO4 can be used as a high-efficiency sodium supplement and has good compatibility with a sodium ion positive electrode active material, thereby improving the capacity and cycle stability of the sodium ion battery.

The application provides a kind of alkali reinforced copper-based material excitation peroxymonosulfate water treatment method and device, it is related to wastewater treatment technical field, the method includes: adding alkali agent, copper-based material, peroxymonosulfate into water to be treated;The alkali agent is sodium hydroxide and / or potassium hydroxide;The copper-based material is copper oxide and / or copper sulfide.The application has the advantages of excellent pollutant treatment effect, mild reaction condition, simple process flow, green environmental protection, energy saving, easy recovery and recycling, etc., realizes the purpose of small dosage of oxidizing agent and catalyst, high utilization rate of oxidizing agent, small amount of metal ion dissolution and pH of effluent reaching standard.

This invention provides a rumen methane inhibitor and its application, belonging to the field of ruminant farming. The active ingredients of the rumen methane inhibitor of this invention include: *Lactobacillus reuteri* inoculum, *Lactobacillus gasseri* inoculum, *Lactobacillus casei* inoculum, amylase, phytase, xylanase, cellulase, and β-glucanase. The rumen methane inhibitor can effectively regulate the intestinal microbiota of dairy cows, promote the decomposition of fibrous material in the rumen, optimize the rumen fermentation environment, thereby controlling rumen function, reducing methane production, and improving the productivity of ruminants. The rumen methane inhibitor is safe and environmentally friendly, which is conducive to its application in ruminant farming, agriculture, and other fields, and has good practicality.

The invention discloses a percutaneous ear vagus nerve stimulation device for losing weight, a closed-loop stimulation method, a system, a terminal and a medium. The percutaneous ear vagus nerve stimulation device comprises an electrode patch, a micro pulse generator, a multi-dimensional physiological signal acquisition module, a processing module, a decision module and an execution module. The electrode patch is in contact with a specific position behind the ear, and the multi-dimensional physiological signal acquisition module is used for acquiring physiological signals; the processing module is used for obtaining state indexes according to the physiological signals; the decision module is used for determining a personalized stimulation mode; the execution module is used for determining stimulation parameters, controlling the micro pulse generator to output stimulation current and acting on an ear vagus nerve branch; in the stimulation process, changes of the multi-dimensional physiological signals are collected in real time, and the stimulation effect is analyzed and fed back to the decision module. The percutaneous ear vagus nerve stimulation device can help a user to reduce appetite, increase satiety and change food preference, and has the effect of moderately reducing body weight.

This application provides a liquid level sensor for a heating device in an aircraft water supply subsystem. The liquid level sensor includes a reed switch assembly, a float assembly, a housing, an end cap, a locking nut, a retaining washer, and wiring terminals. When the liquid level rises to the target liquid level area, the magnetic ring inside the float reaches the distance to trigger the reed switch, causing the reed switch to disconnect and the internal circuitry of the sensor to break, at which point the switch signal is in an off state. Similarly, when the liquid level drops to the target liquid level area, the reed switch sensor activates, at which point the switch signal is in an on state. This application provides a liquid level sensor for a heating device in an aircraft water supply subsystem, fulfilling the requirement for liquid level measurement during aircraft flight.

This invention belongs to the field of secondary batteries, and provides a novel structural additive, a preparation method, a non-aqueous electrolyte containing the novel structural additive, and a secondary battery. The novel structural additive is a complex of an inner salt compound containing a hydrocarbon sulfonate anion and a quaternary ammonium cation with difluorophosphate, having the structure shown in Formula I: where R1 is a hydrocarbon-like group with 1-6 carbon atoms; R2 is a chain-like or cyclic quaternary ammonium cation; R3 and R4 are independently selected from one of , , , , or ; R5, R6, and R7 are independently selected from hydrocarbon groups or hydrocarbon oxygen groups; R8, R9, and R... 10 The elements are independently selected from hydroxyl groups; n=1~6, m=1~6, p=1~6, and n, m, and p are independent of each other; M is a metallic element selected from Li or Na. A non-aqueous electrolyte and a secondary battery containing this novel structural additive are provided, which can improve the battery's low-temperature discharge performance and high-temperature storage performance, and extend cycle life.

The present invention relates to a nasal hair trimmer which significantly improves cutting performance by optimally designing the structure of the cutting portion of the nasal hair trimmer.

This application relates to the field of concrete technology, specifically disclosing a fair-faced concrete and its preparation method. The raw materials for fair-faced concrete include cement, fly ash, mineral powder, glass powder, sand, reinforcing coarse aggregate, water, water-reducing agent, defoamer, and pumping agent; the preparation method is as follows: (1) cement, fly ash, mineral powder, glass powder, sand, and reinforcing coarse aggregate are added to a mixer and mixed evenly; (2) water, water-reducing agent, defoamer, and pumping agent are added to the mixer and mixed evenly to obtain fair-faced concrete. The fair-faced concrete of this application has the characteristics of high strength and high fluidity. Therefore, the vibration step is omitted during the construction and pouring process, greatly shortening the construction cycle, reducing the possibility of operational errors, and reducing rework costs.

This invention belongs to the field of methoxyamine hydrochloride preparation technology and discloses a method for separating methoxyamine hydrochloride and ammonium chloride. The method involves cooling a mixed solution containing ammonium chloride and methoxyamine hydrochloride to selectively crystallize out ammonium chloride, which is then separated to obtain ammonium chloride crystals and a mother liquor enriched with methoxyamine hydrochloride. The mother liquor is then concentrated or dissolved by heating, followed by ultra-low temperature crystallization, separation, and drying to obtain methoxyamine hydrochloride crystals. This invention uses ultra-low temperature segmented crystallization to selectively precipitate ammonium chloride, resulting in methoxyamine hydrochloride crystals with a purity ≥99.9% and ammonium chloride crystals with a purity ≥98%.

A fluorescence-magnetic resonance dual-modality contrast agent, a preparation method thereof and the use thereof. The contrast agent has the following structure: X-L-Y, wherein: formula (I); R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, and R12 are each independently selected from H, halogen, OH, NH2, COOH, CONH2, NO2, CN, and low alkyl groups, the low alkyl groups can be substituted with halogen, OH, NH2, COOH, CONH2, SO3H, NO2, and CN, wherein R3 and R4, taken together with the carbon atoms to which they are attached, may form a phenyl group or a heterocyclic group; R7 and R8, taken together with the carbon atoms to which they are attached, may form a phenyl group or heterocyclic group; L is a linking group; and Y is a metal chelate.