73results about "Material analysis by electric/magnetic means" patented technology

A portable sensor device incorporates a low-power, nanostructure sensor coupled to a wireless transmitter. The sensor uses a nanostructure conducting channel, such as a nanotube network, that is functionalized to respond to a selected analyte. A measurement circuit connected to the sensor determines a change in the electrical characteristic of the sensor, from which information concerning the present or absence of the analyte may be determined. The portable sensor device may include a portable power source, such as a battery. It may further include a transmitter for wirelessly transmitting data to a base station.

The invention discloses a multilayer thin film OTFT (organic thin film transistor) formaldehyde gas sensor and a preparation method thereof. The sensor is in a bottom-grid bottom-contact device structure, and is provided with a source a, a drain b and a grid c, wherein a trench between the source and the drain is designed as an interdigital structure; the source and the drain are respectively a gold/titanium double-layer film, the gold material is used as an electrode layer, and the titanium material is used as a transition layer; and a sensitive thin film, which is an organic semiconductor material-inorganic nano oxide multilayer thin film, is arranged between the source and the drain. The invention combines the organic semiconductor material with the inorganic nano oxide, and adopts a multilayer thin film mode to prepare the sensitive thin film, thereby greatly enhancing the sensitivity and response speed of the sensor. On the premise of implementing formaldehyde gas detection, the invention breaks through the limitation in material selection in the traditional OTFT device, and adopts the MEMS technology to prepare the OTFT device. The invention has the advantages of small size, low cost and the like, can be integrated into an array, and opens up a new way for preparation and application of the OTFT formaldehyde sensor.

A temperature regulation system has a polished surface sufficiently smooth so as to reduce the emissivity of the surface. A conduit is in thermal proximity to the polished surface and is in communication with a source of coolant. The coolant is circulated through the conduit so as to transfer heat from the surface to the coolant. System may include a sprayed-on resistive heater. An a temperature controlled vessel has a heat transfer wall that is of an electrically conductive material that is coated with a durable thermally conductive and electrically nonconductive coating. The coating may be a sprayed on coating and the vessel may hold a buffer for performing electrophoresis.

The invention provides methods and compositions for detecting a change in a nucleic acid polymerase conformation involving contacting a nucleic acid polymerase non-covalently attached to a single walled carbon nanotube (SWNT) with a first nucleotide or first nucleotide analog and a template and detecting the conformationally changed nucleic acid polymerase by measuring a first electrical conductance change in the SWNT between the nucleic acid polymerase and the conformationally changed nucleic acid polymerase. The method is useful for sequencing of polynucleotides.

The invention relates to an exosome detecting method based on adapter and rolling ring amplification. An electrochemical sensor method is applied for constructing an adapter probe based on exosome singularity. A signal is generated by means of H2O2 reaction catalysis by G-tetrad-Hemin simulated peroxidase. A large number of G-tetrads are synthesized through rolling ring amplification for performing signal amplification. The method realizes quantitative detection for the exosomes and is used for detecting an actual serum sample. According to the method of the invention, the adapter probe basedon the exosome singularity is constructed through applying an electrochemical sensor method; the signal is generated through H2O2 catalysis by the G-tetrad-Hemin simulated peroxidase; and furthermorea large number of G-tetrads are synthesized through rolling ring amplification for realizing signal amplification, thereby greatly improving detecting sensitivity of the exosome.

The invention discloses a water pollution online analysis and quick source tracing method used for strengthening supervision of wastewater discharged by enterprises in the industries of printing and dyeing, coking, electroplating, electronic manufacturing, papermaking, pharmacy, metal manufacturing and the like. According to the method, a multi-channel laser Raman online analysis and multi-channelelectrochemical online analysis combined technology is adopted to perform online analysis and monitoring on multiple types of pollutants possibly occurring in a monitored water area, and the online analyzed and monitored water pollution data is analyzed automatically by utilizing a pre-constructed pollution source database, source tracing software and a data analysis platform so as to realize online water pollution source tracing. By adopting measures such as multiple test channels, a wide-electrochemical potential window three-dimensional bismuth film alloy electrode, a modulation asymmetricsquare wave test method, a surface enhanced Raman accessory and the like, the test rate, the detection capability and the monitoring resolution capability of online analyzing and testing various types of pollutants are ensured.

The invention discloses a complete set of device for an SCGE (single cell gel electrophoresis) test, comprising a box body and a box cover. A grid-shaped bracket is arranged in the box body, and glass slides are respectively arranged in grids of the bracket. Each glass slide is composed of a horizontal bottom plate, two lateral plates and flat plates. The two lateral plates are vertical to the bottom plate. The flat plates which are parallel to the bottom plate are respectively arranged at the upper ends of the two lateral plates and extend outwards. A sample inlet hole corresponding to the grids of the bracket in the box body is arranged on the box cover, and is sealed by a partition pad for a sample inlet gun head to penetrate through. By integrating sample preparation and storage of the SCGE test, the device is convenient for use; gel cannot easily shed off; in addition, the device can realize mass preparation of samples, quicken the sample preparation and increase the success rate, thereby ensuring high efficiency and accuracy of the SCGE test.

The present invention provides a micro sensor for monitoring the cleaning and drying processes of surfaces of dielectric films, micro features in porous dielectric films and biologic or other cells common in microelectronics fabrication, MEMS fabrication or microbiology test system fabrication. By embedding electrodes in the surface of a supporting dielectric, the sensor can probe the surface and pores of a covering dielectric or a cell on the covering dielectric. The addition of a guard reduces the effects of any parasitic capacitance, which extends the measurement bandwidth of the sensor and allows it to be manufactured at the scale of a single cell, a feature that is particularly important for applications in microbiology.

The gas sensor array for detecting indoor gaseous pollutant consists of several In-Sn oxide film gas sensors with different In/Sn atom ratio within 0-1.0. The sensors with different In/Sn atom ratio have different response to gases, so that the gas sensor array has greatly raised gas selectivity and may be used in identifying benzene, toluene, xylene, formaldehyde and other common indoor pollutant gases.

As previous processing of measurement in which gas to be measured containing, as gas components, carbon dioxide ¹³CO₂ and carbon dioxide ¹²CO₂, is introduced into a cell, and in which the intensities of transmitted lights having wavelengths suitable for measurement of the respective gas components, are measured and then data-processed to measure the concentrations of the gas components, the air having a predetermined volume Va is sucked by a gas injection device 21, a gas exhaust valve V6 of a cell 11 is closed and the air stored in the gas injection device 21 is transferred to the cell 11 filled with the air at an atmospheric pressure, thereby to pressurize the cell inside. The pressure thus pressurized is measured as P. The cell volume Vc is subtracted from the product obtained by multiplying the sum. V0 of the volume Va and Vc the cell volume Vc, by the ratio P0/P in which P0 is the target pressure of the gas to be measured at which a calibration curve has been prepared for an isotope gas analysis and measurement, thus determining the one-time gas injection amount of the gas injection device 21. Thus, measured concentration variations based on changes in atmospheric pressure can be corrected.

An ion mobility spectrometer is provided with at least one ionization chamber (1) through which analyte-containing gas can flow. A radiation source (2) is provided from which ionizing radiation is suitable for ionizing the analyte-containing gas at least partially, enters the ionization space (1). A separation area is located behind the ionization space (1) in the direction of flow, into which the partially ionized gas is admitted as an ion carrier gas (4) and a nearly ion-free gas is admitted as a drift gas (5) in such a way that a flow in which predominantly ion carrier gas (4) flows through cross-sectional areas (6) and predominantly drift gas (5) flows through other cross-sectional areas (7, 7′), becomes established at least in the inlet area of the separation area (8). The drift gas (5) and ion carrier gas (4) flow unidirectionally and the cross-sectional areas (6), through which predominantly ion carrier gas (4) flows, are smaller in at least one dimension than the cross-sectional areas (7, 7′), through which predominantly drift gas (5) flows.

An Anode Rod Depletion Indicator for use with a sacrificial anode in a fluid storage tank. A core wire, which is arranged within the anode, has a series of hollow or fluted passageways. When the anode depletion causes a predetermined amount of the core wire to be exposed, fluid contained in the storage tank flows in the hollows or flutes of the core wire. The fluid pressurizes and activates a pressure gauge or switch, or pushes a piston up to a location, which is visible to the owner. In an embodiment, a visible indicator such as “Good” is visible on a pressure gauge until the fluid pressure indicates “Replace” on the pressure gauge or until the piston pushes up a “Replace” indicator to the need to replace anode rod, to prevent corrosion and failure of the tank, while the anode is still providing corrosion protection of the tank. An electrical switch may cut off supply fluid, fuel supply, and/or activate an alarm.

The present invention relates generally to microtiter plate format devices and methods for separating molecules having different net charges. The devices and methods of the invention are particularly suited for use in high-throughput screening to monitor enzymatic reactions which result in a product having an altered net charge. For example, the systems and methods disclosed herein may be used to detect the activity of phosphatases, proteases and kinases on various peptidic substrates under various conditions.

There is provided an air-fuel ratio sensor with which an improvement in the accuracy in detecting the air-fuel ratio of detection target gas and an improvement in the response characteristics can both be achieved. The sensor includes a sensor element that outputs an output signal indicative of the air-fuel ratio of a detection target gas, a pair of electrodes including a detection target gas side electrode to which the detection target gas is introduced and an atmosphere side electrode exposed to the atmosphere, which are arranged in such a way as to sandwich the sensor element, a diffusion-controlling layer that is disposed on the sensor element in such a way as to cover the detection target gas side electrode and introduces the detection target gas from an entrance portion through which the detection target gas flows in to the detection target gas side electrode, and a catalyst layer provided on a part of the entrance portion.

The invention discloses a structural material ultra-high temperature corrosion experiment system and method under a serious accident of a nuclear reactor. The system comprises a gas supply system, a vacuum system, an experiment section, a cooling system and a tail gas analysis system; the gas supply system can be used for preparing corrosive gases with different water vapor contents; the experiment section is composed of a high-temperature radiation furnace, a low-temperature radiation furnace, a ceramic reaction tube, a heating wire, an air-cooled copper tube and heat preservation cotton, andtwo quartz glass windows are formed in the side wall of the high-temperature radiation furnace and used for containing a high-speed camera and an infrared temperature measurement probe respectively;the cooling system can provide necessary cooling for key equipment; the tail gas analysis system can measure the concentration of each component of the corrosion reaction tail gas on line, so that high-precision continuous measurement of reaction kinetics is realized; the experiment system further comprises a power distribution system, a numerical control system and a data measurement and acquisition system. The invention further provides an experimental method. By using the method and system, key data are provided for nuclear reactor safety design by carrying out a structural material ultra-high temperature corrosion experiment in a severe accident environment of the nuclear reactor.

The invention discloses a method for confirming the warfarin quantity used for Chinese individual; the genome DNA of the patient is extracted for genotype detection and then the drug quantity of every patient is induced based on the age, weight and the genotype of VKORC1(-1639G more than A) and CYP2C9 to help the clinical doctor to use warfarin more rationally; in this way, INR proper level can be obtained in advance and the probability of bleeding and other adverse events; the safety for drug use and the treatment effect are promoted.

The invention belongs to the technical field of biology, and particularly relates to a characteristic polypeptide for identifying the deer-horn glue of Cervus nippon or Cervus elaphus, and application of the characteristic polypeptide. The characteristic polypeptide provided by the invention is as follows: a peptide fragment 1 is as shown in SEQ ID No. 1: ASTGAALVVR; and a peptide fragment 2 is as shown in SEQ ID No. 2: TPVGQGPSVPVPNR. The characteristic polypeptide and the detection method provided by the invention provide reference for searching a characteristic peptide fragment in related species lacking in a database. The characteristic polypeptide provided by the invention has excellent specificity and stability for the deer-horn glue of the Cervus nippon or the Cervus elaphus, is high in specificity, can be used for identifying deer-horn glue medicinal materials and Chinese patent medicines added with the the deer-horn glue medicinal materials, and has a good application prospect.

Provided is a technique capable of ascertaining the process condition of the boundary between electrically positive and negative plasma regions. In a vacuum chamber, one of the parameters of process conditions is stepwisely changed to generate a plasma under at least three process conditions. The parameters include a flow rate ratio between an electrically negative gas and an electrically positive gas, a pressure in the vacuum chamber and the magnitude of an energy supplied to the gases. Next, a voltage is applied to a Langmuir probe positioned in that plasma, and a current-voltage curve indicating the relationship between the applied voltage and the electric current to flow through the probe is acquired for each of the process conditions. On the basis of the current-voltage curve group acquired, the process conditions are determined for the boundary between the electrically positive and negative plasma regions.

The invention belongs to the field of protein analysis, and relates to a new method for enrichment of a glycosylated peptide through a magnetic nanometer material modified by aminoxy, in particular to a method for solid-phase enrichment and mass spectrographic analysis of a glycosylated peptide fragment. The method comprises the following steps: firstly, using sodium periodate NaIO4 to oxidize a hydroxyl group on a glycopeptide to change the hydroxyl group to an aldehyde group; secondly, placing the magnetic nanometer material Fe3O4@ONH2 modified by aminoxy to an oxidized glycopeptide solution, and fixing the glycopeptide to the magnetic nanometer material through reaction of an aminoxy group and the aldehyde group obtained after a sugar chain in the glycopeptides is oxidized; thirdly, cleaning to remove non-glycopeptide which does not react with the nanometer material; finally, dissociating the captured glycopeptide from the material by use of sugar chain enzyme, and realizing mass spectrographic analysis of the glycosylated peptide. The method is simple in step, convenient to operate, high in speed and efficient, and can realize highly-sensitive and highly-selective mass spectrometric analysis of the glycosylated peptide.

The invention relates to a gas sensor based on a novel SnO2 nanorod monocrystalline material. The gas sensor comprises a substrate, an interdigital metal electrode layer and a sensing conductor, wherein the interdigital metal electrode layer is arranged on the substrate, and the sensing conductor is made of a SnO2 nanorod monocrystalline material with nodes on the surface and is arranged on the interdigital metal electrode layer. Since the sensing conductor of the gas sensor based on the novel SnO2 nanorod monocrystalline material is made of the SnO2 nanorod monocrystalline material with nodes on the surface, which can be produced on a large scale, and the SnO2 nanorod monocrystalline material is simple and easy to produce and has good repeatability and low production cost, the raw materials of the SnO2 nanorod monocrystalline material are easy to obtain; moreover, the SnO2 nanorod monocrystalline material consists of a large amount of nanorods in microstructure and has high surface ratio, therefore, the gas sensor has high sensitivity and is expected to be applied to industrial safety and other fields significantly.

The invention provides a stannic oxide-polyacid compound gas sensing material and a preparation method thereof. The prepared new polyacid-modified stannic oxide nano-rod material can be applied to a photoelectric gas sensor. The material is the stannic oxide-polyacid compound material which is formed by taking stannic oxide (SnO2) nano-rod as a main body and modifying with a cyanogen metal complex modified Dawson type phosphowolframate ((C4H10ON)23[HN(CH2CH2OH)3]10H2[FeIII(CN)6(alpha2-P2W17O61CoII)4].27H2O). Under room temperature environment and irradiation of a xenon lamp, the sensor has obvious sensing detecting property for toxic formaldehyde and methylbenzene gas. The preparation method for the stannic oxide-polyacid compound gas sensing material provided by the invention is simple and is fit for the development and production of a novel high-performance gas sensor.

The invention discloses a high-sensitivity detection method of normal-temperature normal-pressure surface assisted laser desorption mass spectrometry, and belongs to the technical field of mass spectrometry. The invention adopts graphite as an energy conducting material in an ionization process, and a laser desorption plasma ionization mass spectrometric device is used for the detection of various micromolecular compounds. Compared with the prior art, the invention has high detection sensitivity.

The present invention discloses a photoelectrochemical biosensor comprising an electrolytic cell, electrolyte provided in the electrolytic cell, an organic electrochemical transistor provided in the electrolytic cell, and a gate electrode provided in the electrolytic cell, wherein the organic electrochemical transistor comprises a substrate, a source electrode and a drain electrode disposed on the substrate, and an organic semiconductor thin film layer coating the substrate and connected with the source electrode and the drain electrode; the gate electrode is modified with a photoelectric active semiconductor material as a sensitive functional layer of the sensor. The photoelectrochemical biosensor of the invention has extremely high sensitivity, the structure is simple and the device size is small, and the problem that the photoelectrochemical biosensor is not easy to miniaturize is solved. The photoelectrochemical biosensor of the invention has universality in the field of biological detection, and can be widely applied in the biosensor field such as enzyme biosensor, cell biosensor and the like, besides applied to DNA sensor and immune sensor.