46 results about "Isotopic tracer" patented technology

A rapid, non-invasive breath-test method and device for diagnosing the presence or absence of H. pylori in a subject without administration of isotopic tracers is described. The device consists of a highly sensitive colorimetric ammonia sensor placed in contact with sampled subject breath. The sensor is measured using appropriate reflection spectroscopy instrumentation. The breath-test method consists of measuring a basal ammonia level with the device, administering non-isotopic urea and continuing measurement of the ammonia content in a plurality of consecutive breaths. Diagnostic differences in breath ammonia are identified between H. pylori infected and uninfected individuals.

The invention discloses a rock mass seepage path observation device based on isotope tracer technology and a use method thereof, which comprises a rock mass sample provided with seepage holes, one end of the rock mass sample is provided with a water inlet, and the other end is provided with a water outlet , the rock mass sample has a radioactive isotope tracer mixed with the liquid flowing from the water inlet to the water outlet. A support is provided on one side of the rock mass sample, and a lifting device is provided on the support. Detectors of radiation emitted by radioactive isotopes. The invention is closer to practical application, and the obtained rock mass seepage path observation device based on the isotope tracer technology has simple structure and convenient operation, and can accurately describe the seepage path of groundwater in the rock mass.

This invention refer to microbe restoring of polycyclic aromatic hydrocarbon ( PAHs) contaminated soil technology region. This invention utilizes phospholipid fatty acid analyzing ( PLFA) technology and stable isotope ratio mass-spectrometric technique ( IRMs) to judge normal position high performance degradation germ in PAHs contaminated soil. The invention takes phospholipid fatty acid as biological tag, combine with stable isotopic tracer technology, base on delta value difference of phospholipid fatty acid abstracted from soil to judge degradation bacterium or florae of PAHs in normal position soil, also can judge given strain whether is autochthon degradation bacterium of contaminated soil. This method can validly combine microbial community architecture with function. This invention aim at supplying a method of verity reflecting degradation bacterium or florae in PAHs contaminated soil, thereby could analyze selected strain whether or not is autochthon degradation bacterium and its degradation ability.

The invention belongs to the technical field of tracer test, and in particular relates to an inter-well monitoring method for radioactive isotope. The inter-well monitoring method for the radioactive isotope comprises the steps of obtaining a background sample; treating tritiated water as a radioactive isotope tracer agent and calculating the filling quantity of the tritiated water; transferring the tritiated water of which the filling quantity is calculated into a liquid releasing device; filling the tritiated water into a water filling well through the liquid releasing device; sampling from a monitoring oil well; processing the obtained oil-water sample and preparing into a detection-level sample; transferring the detection-level sample into a beta-ray detecting instruction for detecting to obtain detection data; further analyzing and processing; preparing a tracer agent response curve. According to the inter-well monitoring method for the radioactive isotope, the tritiated water is used as the radioactive isotope tracer agent; the radioactive isotope tracer agent has the advantages of being low in detection cycle, high in chemical and radiochemistry stability, free of attaching to rock and the oil well, and low in toxicity; a low background liquid scintiloscope and an ultralow background liquid scintiloscope is utilized to detect the strength of beta rays; therefore, the sensitivity of instruments is high; the experiment data are accurate.

The invention discloses a biogeochemical in-situ experimental device used for deep sea. The biogeochemical in-situ experimental device comprises a seawater sampling device, a reagent and cultivation bag system, a reagent selecting and quantifying device and a control device, and can realize the following five functions under the actions of a peristaltic pump, a solenoid valve and a rotary valve: afunction of introducing seawater into a cultivation bag, a reagent quantifying function, a function of introducing the reagent into the cultivation bag, a reagent runner cleaning function, an experimental stopping function and a stop agent cleaning function. The existing experimental process and experimental method in a lab are placed onto a sea bottom to perform in situ, so that the purposes ofregularly, quantitatively and automatically performing sample cultivation and experiment marking by the deep-sea biogeochemical experimental device in the deep sea in situ is realized. The cultivationbag in the to-be-recycled biogeochemical in-situ experimental device is taken out, and content change of reactants, reaction products and isotope tracer agents is analyzed in the lab, so that experimental data such as biogeochemical dynamic data of a deep sea in-situ environment can be obtained, and therefore, data support and basis are provided for disclosing a marine biogeochemical circulatingmechanism.

The invention provides a water injection well water injection profile measuring method based on a natural gamma ray baseline. The water injection well water injection profile measuring method comprises the following steps: according to the natural gamma ray baseline of a water injection well, the radioactive intensity of an isotopic tracer is selected; according to the radioactive intensity of the isotopic tracer, a corresponding target isotopic tracer is matched, and is released into the water injection well; a downhole instrument is adopted for rapidly tracing the target isotopic tracer, and an isotope gamma peak curve is acquired; according to the natural gamma ray baseline and the isotope gamma peak curve, a water injection profile of the water injection well is acquired. According to the water injection well water injection profile measuring method provided by the invention, the radioactive intensity of the isotopic tracer is selected according to the natural gamma ray baseline of the water injection well, so as to meet the requirement on the amplitude of a radioactive intensity difference between the natural gamma ray baseline and the isotope gamma peak curve during the measurement of the water injection well having an abnormal amplitude of the natural gamma ray baseline.

The invention relates to the technical field of synthesis of carbon isotope marker compounds and in particular to a method for preparing carbon isotope markers bisphenol S and bisphenol AF. The method provided by the invention is easy in reaction raw material obtaining, low in toxicity and simple in preparation process, and because of an expensive raw material marker phenol, a condition that an excessive amount of phenol is required in a conventional synthesis method is broken through in trace synthesis. Meanwhile, the method provided by the invention is simple in synthesis step, the synthesis method has universality, the carbon isotope markers bisphenol S and bisphenol AF can be efficiently and easily synthesized in a trace amount manner, the radioactivity purity of a target compound is up to 98%, and conditions are provided for operation that fates of degradation, conversion and the like of bisphenol S and bisphenol AF in the environment are researched by using a 13C and 14C isotopic tracer technique later.

The invention relates to a method for analyzing and identifying nationality of imported iron ore by utilizing an isotopic tracer method. The method comprises the following steps: 1, weighing a sample, dissolving the sample by adopting a hydrochloric acid sample dissolving method, and preparing an analysis solution; 2, introducing the prepared solution into an inductively coupled plasma source mass spectrometer for measuring a set isotope ratio, and storing the data into an isotopic tracer database, wherein the set to-be-measured isotopes comprise Mg24, Si28, Ca42, Cr52, Cu63, Zn64, Mo95 and Pb206; and 3, comparing the isotope ratio data with isotopes of import nationality iron ore, and if the isotope ratio data completely accords with isotopes of import nationality iron ore, the production place of the sample can be determined. By utilizing the identification method, iron ore in the production places such as Australia, Brazil and India can be judged, and the method provides a method combining an applied mathematics method and a large analytical instrument, so that the operating requirements of identifying the country of origin of the iron ore products by inspection and quarantine and customs are guaranteed.

The invention relates to an aquifer nitrate denitrification rate in-situ determination method. The method comprises the following steps of 1) extracting underground water of a specific aquifer, and adding isotope labeled KNO3 (<15>N) and KBr medicaments; 2) injecting the underground water in the step (1) into a downhole predetermined depth; 3) after injection in the step (2) is completed, collecting underground water samples into a container at different moments, replacing isopyknic water samples with helium, collecting an upper-layer gas in the container, and extracting a gas product; and 4)determining a concentration of an sotope gas <15>N2O-N+<15>N2-N in a gas product extracted in the step 3), meanwhile, measuring the concentrations of tracers <15>N and Br<-> in the underground water sample collected at different moments and the concentration of a residual quantity of a reactant, drawing a concentration penetration curve according to a relationship between the concentration of eachtest factor and time, and calculating the denitrification rate of nitrate in the aquifer by adopting a <15>N isotope tracer method. The invention also discloses a device for realizing the method.

The invention relates to a dynamic water invasion monitoring device and method for monitoring water invasion of gas wells. According to the technical scheme, the device comprises a conductivity measuring system, a signal transceiver system, a water sample component analyzing system, a radioisotope tracer releasing system and an internal device fixing system; the conductivity measuring system is installed in a protective cover to serve as a complete system for measuring conductivity; the signal transceiver system serves as an integrated system for receiving and transmitting signals; the water sample component analyzing system serves as an analyzing system for comprehensively analyzing chemical properties of formation water; the radioisotope tracer releasing system serves as a measuring system for releasing and collecting a tracer; in the internal device fixing system, bridge plugs separate a water yield formation, the stability and rapidity of measurement are ensured, and the cost of the device is low. A dynamic water invasion monitoring system is formed according to tests of the systems above, water invasion conditions obtained by means of the method are accurate and complete, andthe device and the method are used for similar gas wells.

The invention provides isotopic tracer agent injection equipment. The isotopic tracer agent injection equipment comprises a liquid storage bin, a gas storage tank and an inflator pump, wherein a liquid discharge pipe is arranged at the output end of the liquid storage bin; a piston and a reset spring are arranged inside the liquid storage bin; the reset spring is connected with the inner wall of the liquid storage bin; the liquid storage bin is connected with the gas storage tank through a pipeline with a one-way stop valve; the gas storage tank is also connected with the inflator pump through a pipeline with a one-way stop valve; an injection port is formed in the upper portion of the liquid storage bin; a tracer agent storage tank and a water storage tank are arranged on the two sides of the injection port correspondingly; a one-way stop valve is arranged between the tracer agent storage tank and the injection port; a one-way stop valve is arranged between the water storage tank and the injection port; and the pipeline between the gas storage tank and the inflator pump is detachable. The isotopic tracer agent injection equipment has the beneficial effects of being simple in structure, convenient to use and carry, and capable of being used under the condition of no inflator pump and avoiding pollution of isotopic tracer agents.

The invention discloses a preparation method of a radioactive isotope tracer agent. The preparation method comprises the following steps of: step 1, adding a radioactive iodine salt solution and an oxidant into a certain reaction container, and heating to generate iodine steam; step 2, conveying the iodine steam to the bottom of an adsorption tower filled with a porous adsorption material, and efficiently adsorbing the iodine steam by the porous adsorption material; step 3, after adsorption, circulating a very small amount of the iodine steam remained at the upper part of the adsorption tower into the reaction container; and step 4, after circulating adsorption, uniformly adsorbing all radioactive iodine-131 isotopes; and step 5, carrying out organic coating on the porous adsorption material. By adopting the method disclosed by the invention, a small amount of the radioactive iodine salt solution is added into the oxidant to generate an iodine simple substance; iodine is sublimated at 45 DEG C and the generated high-humidity iodine steam is sucked into a high-pore adsorbent with an impregnant; the whole preparation technology consumes 1 to 2h and the preparation efficiency is greatly improved; the exposure time of operators under a radioactive environment is greatly shortened.

The invention relates to the field of oilfield development, and provides a device and a method for nested layered injection of isotopic tracers. The device comprises an injection container, a water injection pipeline, and valves, and also comprises a sleeve, an oil pipe, a central pipe, and a packer. In the method, through controlling the switches of the valves, the isotopic tracer is injected into corresponding oil layers respectively through the sleeve, the oil pipe, and the central pipe, so as to realize layered injection of the isotopic tracer. The nested layered injection device and the layered injection method realize layered injection of different kinds of isotopic tracers, and injection volume of the isotopic tracer of each oil layer is accurately controlled, accurate monitoring of the isotopic tracer of each oil layer is realized. The device and the method have significant value for determining oil reservoir parameter distribution, reservoir exploitation evaluation, follow-up development scheme design determination, adjustment, and implementation.

The invention relates to the technical field of crop nutrition management and fertilization, in particular to a method for quantifying nitrogen absorption and nitrogen nutrition contribution of non-root organs of crops, which specifically comprises the following steps that an isolation micro-area is arranged in a crop field, and crops are planted; before the nitrogen fertilizer is sprayed to the crops, a high-molecular water-absorbent resin layer is laid in the isolation micro-area; 15 N isotope fertilizer liquid with the concentration of 0.5%-0.75% is sprayed on leaf surfaces; the macromolecular water-absorbent resin layer is moved out and weighed, and the mass difference value m of the macromolecular water-absorbent resin layer before and after spraying of the 15N isotope fertilizer liquid is calculated; the 14N fertilizer liquid is poured into the isolation micro-area, whereinthe mass of the 14N fertilizer liquid is m, and the concentration of the 14N fertilizer liquid is equal to that of the 15N isotope fertilizer liquid; measuring parameters after the crops are mature; and calculating the non-root organ nitrogen absorption amount and the contribution rate of the non-root organ nitrogen absorption amount to crop nitrogen nutrition. According to the method, non-root organ nitrogen absorption amount and contribution of the non-root organ nitrogen absorption amount to crop nitrogen nutrition in a canopy foliage nitrogen fertilizer spraying fertilization mode are quantified based on isolation first and then compensation of a 15N isotopic tracer mark.

The invention discloses a high-pressure resistant radioactive isotope tracer and a preparation method thereof. The preparation method comprises the steps that 1, a solution containing radioactive isotopes is prepared; 2, a porous adsorption material is immersed into the solution to absorb radioactive isotope ions, and drying is carried out; 3, a precipitator solution is added, the radioactive isotope ions are fixed by the precipitator, and drying is carried out; 4, a carrier is placed into a sagger, the carrier is kept warm for 1-2 hours at a certain temperature, and natural cooling is carriedout; and 5, the surface of the carrier is sequentially treated by resin adhesive, antistatic agents, heat resistance agents and surfactants. After the porous material absorbs and fixes the radioactive isotope, the radioactive isotopes are subjected to high temperature treatment, so that the pore of the porous material after absorbing the radioactive isotope is obviously smaller, and shrinks intoa more compact porous sphere, the pressure resistance index of the porous material is improved effectively, and the pressure resistance index of the isotope tracer is improved effectively.

The invention discloses a radioisotope logging tracer underground screening method. The method comprises the following steps that a mixed tracer is added into an isotope bin of a screening device; the valve is opened, and the isotope tracer agent is soaked in the injected water; the valve is closed, and the injected water in the isotope bin is in a static state; in the static state, the tracers in the isotope bin are layered, the tracers with the same specific gravity as the injected water are suspended, and the isotope logging tracers with the specific gravity closest to the specific gravity of the injected water of the to-be-logged section can be screened out; the tracer most matched with the specific gravity of the injected water can be screened out, the problem that isotope logging data are unqualified due to the fact that the specific gravity of the tracer is not matched is solved, and the method is particularly significant to water injection and fine logging of different logging blocks and different mineralization degrees of an oil field. The breakage rate and the isotope desorption rate of the tracer agent are detected by replacing an expensive and huge ultrahigh pressure generating device during ground detection with the high pressure and the real temperature environment of underground injected water, and the problems of radioactive contamination and data distortion are solved.

The invention relates to the field of oil field exploitation, and provides an isotopic tracer layered injection device and method for a multi-zone oil reservoir. The device comprises an injection container, a water injection pipeline, and a valve. The device also comprises N packers and (N+1) eccentric water distributors, wherein the packers are respectively disposed between each two eccentric water distributors. The device also comprises quantitative water nozzles and dead plugs, which are used cooperatively with the eccentric water distributors. The device also comprises the (N+1) quantitative water nozzles. The method comprises the steps: enabling the quantitative water nozzle of one eccentric water distributor to be replaced by one dead plug; enabling the remaining eccentric water distributors to be communicated with an oil layer; slowly injecting isotopic tracer through the control of the opening / closing of the valve; and enabling the isotopic tracer to be injected into a target oil layer. The device and method can achieve the layered injection of different types of isotopic tracers, precisely control the injection amount of isotopic tracer at each oil layer, achieve the accurate monitoring of the isotopic tracer of each oil layer, and has great values for the determining of oil reservoir parameter distribution, reservoir development evaluation, the determining of the design, adjustment and execution of a subsequent development scheme.

The invention provides an oil product leakage monitoring technology adopting a radioactive tracer, and relates to the technical field of oil product permeation detection. A preparation method of the radioactive tracer comprises the following steps of: loading an isotope tracer on a porous carrier in an acid solution; providing a precipitant solution, wherein the precipitant can react with the isotope tracer to form an insoluble substance; and providing a hydrophobic solvent, performing surface hydrophobic treatment on the porous carrier loaded with the insoluble substance by the hydrophobic solvent, and drying to obtain the radioactive tracer. The monitoring technology comprises the following steps: acquiring initial state data by using a detection module; transmitting the initial state data to a server side for automatic storage, and determining a background value; measuring measured signal values at various moments, and transmitting the measured signal values to the server side for automatic storage; and comparing the measured signal values at various moments with the background value, transmitting an alarm signal to an alarm module by the server side when result data changes suddenly, and outputting information of a leakage position and an oil substance diffusion track in an area.

The invention relates to the technical field of ecological monitoring simulation, in particular to a soil-vegetation environment monitoring simulation device. The device comprises a controller, the simulation device comprises a plurality of potting barrels stacked from top to bottom, a positioning framework and a plurality of drainage devices, and each potting barrel comprises a cylinder frame and a telescopic cylinder; a mesh plate is arranged at the bottom of the cylindrical frame, the positioning skeleton comprises a vertical frame and a plurality of positioning mechanisms, the drainage device comprises an annular pipe fitting, a plurality of sampling holes are formed in the bottom end of the cylindrical frame, and the annular pipe fitting is communicated with the sampling holes through a plurality of flow guide pipes. According to the invention, soil temperature, humidity and conductivity are dynamically monitored; wherein isotopic tracers are injected into different soil layers of the potting barrel, so that the trend of ions in the soil can be detected; and then the soil solutions of different soil layers are collected for a solute transport process, underground water and different soil layer thicknesses can be simulated, and the compaction degrees of different soil layers in the soil are reduced to the maximum extent.

The invention provides a research method for simulating an SF6 overheat decomposition reaction based on a stable isotopic tracer method, which comprises the following steps of: constructing an SF6 insulation equipment local overheat experiment platform, controlling a fault temperature by using a temperature controller, and researching accurate injection of H218O and 18O2 with different concentrations. The method comprises the following steps: removing the influence of impurities in the air and impurities remaining on the surface of an experimental apparatus on the experiment, heating for a period of time, collecting the reacted mixed gas in the experimental apparatus, and analyzing the proportion of gas components and isotope compounds by GC / MS, thereby researching the interaction of trace oxygen and water and SFx in the SF6 thermal decomposition process. And analyzing the formation mechanism of the SF6 decomposition product. The experimental platform is designed according to the internal overheating fault condition of the gas insulation equipment so as to simulate the decomposition condition of SF6 under an actual fault.

The invention provides an electric tracer agent injector with bottom face where isotope carrier can be filled. The electric tracer agent injector with the bottom face where an isotope carrier can be filled is mainly composed of an injector box body and is characterized in that the injector box body is composed of a stainless steel cavity, a sealing plug capable of being tightly combined with the stainless steel cavity, an extruding rod, a screen and a miniature speed reducing motor. The sealing plug is provided with a rubber seal ring, and the miniature speed reducing motor is connected with the extruding rod, located in the sealing plug above the extruding rod and fixed on the sealing plug through a jackscrew. The screen is arranged at the bottom of the stainless steel cavity, the lower portion of the extruding rod is located in the screen, and an isotope chamber is formed between the lower portion of the extruding rod and the screen. A threaded structure is located between the lower portion of the extruding rod and the screen. When the motor rotates, the extruding rod is spirally pushed in and out of the screen. The electric tracer agent injector with the bottom face where an isotope carrier can be filled has the advantages of achieving closed operation of an isotope tracer agent, ensuring the environment and person safety, achieving multiple injection operation of the isotope tracer agent and avoiding multiple-time dismounting.

The invention discloses an isotope staged fracturing tracer technology which comprises the following construction steps: S1, construction design: formulating a test implementation scheme, selecting the type of a required isotope tracer agent, and determining the type of the isotope tracer agent according to data such as well spacing, reservoir thickness, porosity, moisture content, connectivity coefficient and instrument of a well group, minimum detection limit and the like; the dosage of the used isotopic tracer agent is calculated according to the following steps and formulas: firstly, the maximum dilution volume Vp=A*H*Sw*Eta injected into a stratum is calculated, and secondly, the dosage Q=mu*MDL*Vp of the tracer agent is calculated; and S2, on-site construction: during fracturing construction, a tracer agent can be added from a fracturing blender truck. According to the isotope staged fracturing tracing technology, the effect of the fracturing fluid on the stratum can be qualitatively and quantitatively analyzed through the isotope staged fracturing tracing technology, and the flowback effect and the fracturing measure effect of the fracturing fluid in each stage in the volume fracturing process are indirectly reflected by monitoring the concentration of each tracer agent in the fracturing flowback fluid in each period.

The invention discloses an isotope tracer injector, and relates to the isotopic tracing field. The isotope tracer injector specifically comprises a box body with an opening in the upper end, a seal plug connected onto the opening of the box body, and a water inlet and a water outlet which are formed in the box body, wherein a cavity of the box body and the seal plug form a mixing chamber, a vertical screen drum is arranged at the bottom of the mixing chamber, a bottom plate is arranged at the bottom of the screen drum, and a press plate is arranged in the screen drum. The isotope tracer injector further comprises a first drive device which drives the screen drum to rise and fall, and a second drive device which drives the press plate to rotate. A storage pipe used to store isotope carriers is arranged on the inner circular face of the screen drum, and is arranged along the axial direction of the screen drum, and located above the press plate. A collision prevention groove corresponding to the storage pipe is formed in the press plate. The isotope tracer injector can achieve repeated injections, and can not pollute the outer world due to the fact that the isotope tracer injector is tightly sealed during the injection process.

The invention provides an anti-pollution isotopic tracer injection device which comprises a box. A liquid storage cylinder and a pressure cylinder are arranged inside the box. An opening in one end of the liquid storage cylinder communicates with an inner cavity of the pressure cylinder. A liquid injection tube is connected into the liquid storage cylinder. A pressing plate is arranged inside the pressure cylinder. The upper end of the pressing plate is connected with a linkage rod. The upper portion of the linkage rod is connected with a drive device. The bottom of the pressure cylinder is connected with a liquid outlet tube communicating with a screen drum arranged inside the box. The lower portion of the screen drum is connected with a blending chamber. A liquid outlet is formed in one side of the blending chamber. A one-way valve is arranged at the front end of the liquid outlet. A receding plate is arranged on the lower portion of the liquid outlet tube and on the screen drum. The anti-pollution isotopic tracer injection device has the beneficial effects that in the isotopic tracer injection process of the liquid storage cylinder filled with an isotopic tracer, operation is the same as that of the pressure cylinder, isotopic tracer liquid is not spilled out of an oil well along a pipeline under the effect of the pressing plate, the liquid containing the isotopic tracer is fully and uniformly blended in the blending chamber in the device and drained out through the liquid outlet tube unidirectionally, and the phenomenon that the liquid flows into soil, thereby influencing the environment and causing environment pollution is avoided.

The invention relates to the field of oil field exploitation, and provides a layered injection device and method for an isotopic tracer. The device comprises an injection container, a water injection pipeline, and a valve. The device also comprises a packer and two eccentric water distributors, and also comprises a quantitative water nozzle and a dead plug, wherein the quantitative water nozzle and the dead plug cooperate with the eccentric water distributors for use. The method comprises the steps: enabling the quantitative nozzle of one eccentric water distributor to be replaced by one dead plug, enabling the other eccentric water distributor to be communicated with an oil layer, slowing injecting the isotopic tracer through the control of the opening and closing of the valve, and enabling the isotopic tracer to be injected to a target oil layer. The device and method can achieve the layered injection of different types of isotopic tracer, can precisely control the injection quantity of the isotopic tracer of the upper and lower oil layers, achieves the accurate monitoring of isotopic tracer of the two oil layers, and has high values for the determining of oil deposit parameter distribution, the development and assessment of a storage layer, and the design, adjustment and enforcement of determining a subsequent development scheme.

Methods modifying conventional SIP so that isotopic incorporation into the genomes of individual microbial taxa can be quantified are described. Further, methods to quantify the baseline densities of the DNA of individual microbial taxa without exposure to isotope tracers and then to quantify the change in DNA density of each taxon caused by isotope incorporation are described. The distribution of DNA of each taxon along a density gradient reflects the influence of isotope incorporation only, without reflecting the guanine-plus-cytosine content.

This invention relates to a method of preparing a radioisotope nanostructure having a ligand-metal framework, and a radioisotope nanostructure prepared thereby. The method of preparing the radioisotope nanostructure of the invention has a simple preparation process and can thus be applied to mass production of a radioisotope nanostructure. Also, because this radioisotope nanostructure is nano-sized spherical particles and has no reactive group, it can be easily dispersed in a fluid, and this nanostructure is physically and chemically stable and thus can be utilized as a radioisotope tracer in the fields of refineries, chemistry, cement, agriculture, water resources, marine, etc. Furthermore, this nanostructure can be used for diagnosis and / or treatment in medical fields, and can be applied to checking whether a nanomaterial is harmful. In addition, this nanostructure is expected to be applicable in a variety of fields using radioisotopes.

The invention provides a subway surface subsidence early warning system. The subway surface subsidence early warning system comprises a pre-buried isotope tracer filling pipe, a signal monitoring device, a signal transmission device, a signal processing system and a surface subsidence early warning system. After the isotope tracer filling pipe is pre-buried in the lining wall of a subway tunnel segment, a 18O isotope tracer mixed with a hydrophilic reagent dimethylolpropionic acid (DMPA) is periodically filled in the tunnel construction period, and the tracer has the characteristic of tracingthrough reverse propagation in the water seepage direction; the signal monitoring device can monitor the propagation path of the isotope and convert the path into a current signal; the signal transmission device collects monitored isotope tracer diffusion signals and transmits the signals to the signal processing system; the signal processing system converts the received signal into a three-dimensional visual image to obtain a settlement displacement field; and the surface subsidence early warning system judges the state of cavities under the surface according to the signal processing result,and sends subsidence early warning in time.

This invention refer to microbe restoring of polycyclic aromatic hydrocarbon ( PAHs) contaminated soil technology region. This invention utilizes phospholipid fatty acid analyzing ( PLFA) technology and stable isotope ratio mass-spectrometric technique ( IRMs) to judge normal position high performance degradation germ in PAHs contaminated soil. The invention takes phospholipid fatty acid as biological tag, combine with stable isotopic tracer technology, base on delta value difference of phospholipid fatty acid abstracted from soil to judge degradation bacterium or florae of PAHs in normal position soil, also can judge given strain whether is autochthon degradation bacterium of contaminated soil. This method can validly combine microbial community architecture with function. This inventionaim at supplying a method of verity reflecting degradation bacterium or florae in PAHs contaminated soil, thereby could analyze selected strain whether or not is autochthon degradation bacterium and its degradation ability.