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Dai, Beijing
Di Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20110066785 | Memory Management System and Method Thereof - A memory management system and method include and use a cache buffer (such as a table look-aside buffer, TLB), a memory mapping table, a scratchpad cache, and a memory controller. The cache buffer is configured to store a plurality of data structures. The memory mapping table is configured to store a plurality of addresses of the data structures. The scratchpad cache is configured to store the base address of the data structures. The memory controller is configured to control reading and writing in the cache buffer and the scratchpad cache. The components are operable together under control of the memory controller to facilitate effective searching of the data structures in the memory management system. | 03-17-2011 |
Hongxing Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20100025224 | APPARATUS AND PROCESS FOR METAL OXIDES AND METAL NANOPARTICLES SYNTHESIS - The present invention provides an approach to control the generation and grow of nanocrystal with membrane diffusion method and related apparatuses to produce inorganic oxide nanopowders and metal nanoparticles. With this method, the size and size distribution of inorganic oxide nanopowders and metal nanoparticles can be tuned. It overcomes the shortcomings possessed by the common chemical and physical method of preparing nanoparticles. | 02-04-2010 |
| 20110286904 | APPARATUS AND PROCESS FOR METAL OXIDES AND METAL NANOPARTICLES SYNTHESIS - The present invention provides an approach to control the generation and grow of nanocrystal with membrane diffusion method and related apparatuses to produce inorganic oxide nanopowders and metal nanoparticles. With this method, the size and size distribution of inorganic oxide nanopowders and metal nanoparticles can be tuned. It overcomes the shortcomings possessed by the common chemical and physical method of preparing nanoparticles. | 11-24-2011 |
Jianwu Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20090305352 | ACTIVATED COLLAGEN SCAFFOLD MATERIALS AND THEIR SPECIAL FUSED ACTIVE RESTORATION FACTORS - Provided are activated collagen scaffold materials as well as their special fused active restoration factors useful for promoting tissue repair, such as bone damage repair or nerve injury repair. The special fused active restoration factors are fusion proteins comprising a collagen-binding domain (CBD) at N-/C-terminus of cytokines, wherein the collagen-binding domain is a polypeptide consisting of 7-27 amino acid residues with a conservative sequence shown in SEQ IN NO:1 at N-terminus. | 12-10-2009 |
Juan Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20100285781 | DEPLOYING LEARNING MANAGEMENT SYSTEMS TO MOBILE COMMUNICATIONS DEVICES - Tools and techniques for deploying learning management systems to mobile communications devices are provided. These tools receive requests from client devices operating within a learning management system, with the request relating to executing commands within the learning management system. The tools execute the commands in response to the requests, and evaluate whether the client devices are mobile client devices. A response to the command is formatted, based on whether the client devices are mobile client devices. | 11-11-2010 |
| 20100311031 | Adaptive Clicker Technique - An adaptive clicker technique is described that provides a standardized polling control and a registration system to support mixed types of clickers and integrate the polling data. One embodiment of the adaptive clicker technique operates as follows. User inputs from more than one type of clicker device (e.g., personal interactive response system device) are received. The inputs from the more than one type of clicker device are formatted with a clicker adapter for each type of clicker to adapt user inputs to a common polling controller. The adapted inputs are then processed with the common polling controller to interface the adapted inputs with a personal response system software application to allow user polling data to be collected and assessed. | 12-09-2010 |
Lei Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20120065438 | Process for Syntheis of 10,10-Dibromo-9,9-dianthracene - This invention, which belongs to the field of organic electroluminesent materials synthetic technology, involves synthetic method of 10,10′-Dibromo-9,9′-bianthryl. The synthetic method is to use 9,9′-bianthryl as raw material, chlorinated hydrocarbon as solvent, bromide as bromine agent and react. This method not only produces no environmental pollution, but also enjoys high yield, therefore, it is suitable for industrial production. | 03-15-2012 |
| 20120065445 | Process For Synthesis of 9,9'-Dianthracene - This invention, which involves “the synthetic method of 9, 9′-biantnthracine”, belongs to the field of synthetic technology of organic electroluminesent materials. Synthetic method of 9, 9′-bianthracine is to add anthraquinone as raw material and zinc as reducing agent in glacial acetic acid solution, then batch addition of hydrochloric acid at 70-120°, maintain the temperature unchanged and react, then 9, 9′-bianthracine is achieved. This invention uses one-step method to synthesize 9, 9′-bianthracine, which reduces not only cost but also generation of side products, in addition, the products obtained need no purification and can be directly used to synthesize related similar compounds, therefore, it is very suitable for large-scale industrial production. | 03-15-2012 |
| 20120071695 | Synthetic Method of 5,5-Dimethyl-2,4-Adipaldehyde-0,0-Boron Difluoride - This invention, which involves synthetic method of 5, 5- dimethyl-2, 4-adipaldehyde-0, 0-Boron difluoride, belongs to the field of organic synthesis. Synthetic method of 5, 5-dimethyl-2, 4-adipaldehyde-0, 0-Boron difluoride is to react pinacolone and boron trifluoride diethyl ether at low temperature, and then add aqueous alkaline solution in after treatment to extract product from ether, after that, separate fluid, condense organic phase and final product is obtained. Yield of this method is 2 to 3 times higher than that in literature, and apart from that, mild reaction condition, simple procedures, easy operation, and low cost make it easy for industrial production. The product can be used directly in next step reaction without any special purification. | 03-22-2012 |
Lishun Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20100213102 | CATALYTIC CONVERSION PROCESS - A catalytic conversion process which comprises catalytic cracking reaction of a hydrocarbon feedstock contacting with a medium pore size zeolite enriched catalyst in a reactor, characterized in that reaction temperature, weight hourly space velocity and catalyst/feedstock ratio by weight are sufficient to achieve a yield of fluid catalytic cracking gas oil between 12% and 60% by weight of said feedstock, wherein said weight hourly space velocity is between 25 h | 08-26-2010 |
| 20100314287 | COMBINED PROCESS FOR HYDROTREATING AND CATALYTIC CRACKING OF RESIDUE - Disclosed is a combined process for hydrotreating and catalytic cracking of residue, wherein the residue, catalytic cracking heavy cycle oil with acidic solid impurity being removed, optional distillate oil and adistillate of catalytic cracking slurry oil from which the acidic solid impurity is removed are fed into residue hydrotreating unit, the hydrogenated residue obtained and optional vacuum gas oil are fed into catalytic cracking unit to obtain various products; the catalytic cracking heavy cycle oil from which the acidic solid impurity is removed is circulated to the residue hydrotreating unit; the catalytic cracking slurry oil is separated by distilling, the distillate of the catalytic cracking slurry oil after removing off the acidic solid impurity is circulated to the residue hydrotreating unit. This process makes the residue hydrotreating and catalytic cracking being combined together more effectively such that it is not only able to improve product quality of the residue hydrotreating, elongate operation cycle of the residue hydrotreating unit, but also increases the yield of the hydrogenated diesel oil and catalytic cracking light oil, and decreases coking quantity of the catalytic cracking. | 12-16-2010 |
| 20110000818 | PROCESS FOR CONVERTING INFERIOR FEEDSTOCK TO HIGH QUALITY FUEL OIL - A catalytic conversion process can convert inferior feedstock to high quality fuel oil and propylene. A inferior feedstock is introduced into first and second reactor zone, wherein the feedstock carry out first step and second step reactions by contacting with catalytic conversion catalyst. Product vapors separate from spent catalyst by gas-solid separation. The spent catalyst is stripped, regenerated by burning off coke and then returns to reactor. The product vapors are introduced into separation system to obtain propylene, gasoline, diesel, fluid catalytic cracking gas oil (FGO) and other products. The FGO is introduced into hydrotreating unit and/or extraction unit to obtain hydrotreated FGO and/or extracted FGO. Said hyrotreated FGO and/or extracted FGO return to the first reactor zone and/or another catalytic cracking unit to obtain propylene and gasoline. The extracted oil of said FGO is rich in double ring aromatics which are good chemical materials. The raffinate of said FGO is rich in chain alkane and cycloalkane which are suitable for catalytic cracking. More particularly, the invention relates to a process to utilize petroleum oil resources efficiently for decreasing the yield of dry gas and coke significantly. | 01-06-2011 |
| 20110062054 | IMPROVED INTEGRATED PROCESS FOR HYDROGENATION AND CATALYTIC CRACKING OF HYDROCARBON OIL - Disclosed is a combination process for improved hydrotreating and catalytic cracking of hydrocarbon oils, including: contacting residual oil, catalytic cracking cycle oil, and optional distillate oil with a hydrotreating catalyst under hydrotreating conditions in the presence of hydrogen followed by separation of the reaction products to obtain gas, hydrogenated naphtha, hydrogenated diesel oil, and hydrogenated tail oil; contacting the hydrogenated tail oil and optional normal catalytic cracking feedstock oil with a cracking catalyst under catalytic cracking conditions followed by separation of the reaction products to obtain dry gas, hydrogenated naphtha, liquefied petroleum gas, catalytic cracked gasoline, catalytic cracked diesel oil, and catalytic cracking cycle oil; wherein the hydrogenated tail oil and/or normal catalytic cracking feedstock oil are separated into at least two fractions, the light and the heavy fractions or normal catalytic cracking heavy feedstock oil and normal catalytic cracking light feedstock oil, prior to contacting the hydrogenated tail oil and/or normal catalytic cracking feedstock oil with the cracking catalyst. The process according to the present invention is especially suitable for conversion of hydrocarbon oils to produce more products of gasoline or diesel oil. | 03-17-2011 |
Mo Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20110153604 | EVENT-LEVEL PARALLEL METHODS AND APPARATUS FOR XML PARSING - Embodiments of techniques and systems for parallel XML parsing are described. An event-level XML parser may include a lightweight events partitioning stage, parallel events parsing stages, and a post-processing stage. The events partition may pick out event boundaries using single-instruction, multiple-data instructions to find occurrences of the “<” character, marking event boundaries. Subsequent checking may be performed to help identify other event boundaries, as well as non-boundary instances of the “<” character. During events parsing, unresolved items, such as namespace resolution or matching of start and end elements, may be recorded in structure metadata. This structure metadata may be used during the subsequent post-processing to perform a check of the XML data. If the XML data is well-formed, individual sub-event streams formed by the events parsing processes may be assembled into a flat result event stream structure. Other embodiments may be described and claimed. | 06-23-2011 |
Pu Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20090311676 | Method for preparing primer used for determining the mutation in PDS gene related to large vestibular aqueduct syndrome in vitro and the use of the primer - The present invention relates to a method of preparing a primer used for determining the IVS7-2A→G site mutation involved in the large vestibular aqueduct syndrome. The method comprises the steps of: designing a primer pair which may introduce any base substitutive mutation in the region of 1-13 bases between upstream and downstream including the IVS7-2 mutation site (A→G) based upon the IVS7-2 A→G mutation site in the PDS gene, so as to obtain a new restriction site which may be used for distinguishing IVS7-2 wild type A site and mutant G site in the amplification products. The present invention further relates to the primers prepared according to this method, the kit or reagent or identical product comprising the primers, and a method for determining the IVS7-2A→G site mutation of large vestibular aqueduct syndrome with said primers in vitro. | 12-17-2009 |
| 20090311679 | TaqMan MGB probe useful for detecting the mitochondrial gene C1494T mutation associated with maternally inherited deafness and the use thereof - The present invention relates to a real time quantitative TaqMan MGB probe useful for detecting the mitochondrial gene C1494T mutation associated with maternally inherited deafness and the use thereof. The present invention design a Taqman mutant probe and a wild type MGB probe, and a pair of primers. A maternally inherited deafness associated with mitochondrial gene C1494T mutation can be diagnosed by the method of real time quantitative Taqman MGB probe. This method is characteristic of easily operating, fast, high specificity, high sensitivity, and the interpretation of the result is intuitionistic, accurate and reliable. It's suitable for large scale screen and preventive examination of mitochondrial gene C1494T mutation associated with maternally inherited deafness. | 12-17-2009 |
Qingyu Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20080309338 | MRI APPARATUS AND RF TRANSMIT GAIN SETTING METHOD - An MRI apparatus which obtains a tomogram of an object by utilizing magnetic resonance includes a calibrating device which figures out a relationship between a center frequency and an optimal gain of RF transmission with respect to a predetermined range of central frequencies, a saving device which saves information expressing said relationship, and a setting device which sets the RF transmission gain according to the center frequency during subsequent scanning by utilizing the saved information. | 12-18-2008 |
| 20120063544 | METHOD AND DEVICE FOR PRE-DISTORTING AN EXCITER AND PREDISTORTION EXCITER - A method for pre-distorting an exciter includes obtaining a characteristic curve of a radio frequency (RF) amplifier, obtaining a first relationship between a gain amplitude correction value and an input power and a second relationship between a gain phase correction value and the input power based on the characteristic curve, obtaining a transmission gain for use in a scan from a magnetic resonance pre-scan, and obtaining the gain amplitude correction value and the gain phase correction value of an input of the exciter based on the input of the exciter, the transmission gain, the first relationship, and the second relationship. An input of the exciter is pre-distorted using the gain amplitude correction value and the gain phase correction value. | 03-15-2012 |
Qionghai Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20110158507 | METHOD FOR VISION FIELD COMPUTING - A method for vision field computing may comprise the following steps of: forming a sampling system for a multi-view dynamic scene; controlling cameras in the sampling system for the multi-view dynamic scene to perform spatial interleaved sampling, temporal interleaved exposure sampling and exposure-variant sampling; performing spatial intersection to the sampling information in the view subspace of the dynamic scene and temporal intersection to the sampling information in the time subspace of the dynamic scene to reconstruct a dynamic scene geometry model; performing silhouette back projection based on the dynamic scene geometry model to obtain silhouette motion constraints for the view angles of the cameras; performing temporal decoupling for motion de-blurring with the silhouette motion constraints; and reconstructing a dynamic scene 3D model with a resolution larger than nominal resolution of each camera by a 3D reconstructing algorithm. | 06-30-2011 |
| 20110285822 | METHOD AND SYSTEM FOR FREE-VIEW RELIGHTING OF DYNAMIC SCENE BASED ON PHOTOMETRIC STEREO - A method and a related system of free-view relighting for a dynamic scene based on photometric stereo, the method including the steps of: 1) performing multi-view dynamic videos of an object using a multi-view camera array under a predetermined controllable varying illumination; 2) obtaining a three-dimensional shape model and surface reflectance peculiarities of the object; 3) obtaining a static relighted three-dimensional model of the object and a three-dimensional trajectory of the object; 4) obtaining a dynamic relighted three-dimensional model; and 5) performing a free-view dependent rendering to the dynamic relighted three-dimensional model of the object. | 11-24-2011 |
Renchang Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20080291708 | PROTECTIVE CIRCUIT AND METHOD FOR MULTI-LEVEL CONVERTER - A protective circuit for a multi-level converter including a DC link capacitor bank includes: an energy absorbing element; switches, wherein at least two of the switches each couple the energy absorbing element to the capacitor bank; and a controller configured to provide control signals to the switches to selectively actuate the switches to enable control of energy dissipation and to enable control of voltage balance on the capacitor bank of the multi-level converter. | 11-27-2008 |
Rongping Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20120035738 | INTRAVITREOUS SELF ADAPTIVE STENT - Disclosed herein are devices, methods and kits for a stent for treating an eye, comprising a flexible material, wherein the stent is self adaptive to a dimension of a vitreous cavity in the eye. | 02-09-2012 |
Wei Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20110288353 | METAL LOADED CATALYST AND PREPARATION METHOD THEREOF - A metal loaded catalyst comprises a support and main active metal components and optional auxiliary active metal components, wherein the main active metal components are elementary substances and obtained by ionizing radiation reducing precursors of main active metal components. The catalyst can be widely used in the catalytic reactions of petrochemistry industry with high activity and selectivity. The catalyst can be used directly without being reduced preliminarily by hydrogen. | 11-24-2011 |
| 20120071700 | CATALYSTS FOR HYDROGENATION OF UNSATURATED HYDROCARBONS AND PREPARATIONS AND USES THEREOF - Disclosed are catalysts for hydrogenation of unsaturated hydrocarbons comprising at least one carrier, at least one active metallic component supported on the at least one carrier, and at least one silane group; and wherein the at least one active metallic component is chosen from palladium, platinum, nickel, copper, and ruthenium; the at least one silane group is grafted to the catalyst by silylation and is present in an amount ranging from 0.05% to 25% by weight relative to the total weight of the catalyst. Also disclosed are processes for the preparation of the catalysts and processes using the catalysts for hydrogenation of unsaturated hydrocarbons. | 03-22-2012 |
Wenjun Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20110252042 | MAKE AND MODEL CLASSIFIER - Systems and methods for assigning a product category and/or classification to user data based on a taxonomy of makes and models is provided. User data is received and converted to plain text. A taxonomy is provided, having a plurality of categories corresponding with product descriptions based on product makes and models. Rules are associated with the categories in the taxonomy and used to generate a category score for categories in the taxonomy. The category scores are used to assign at least one category from the taxonomy to the user data. A product class may also be assigned to the user data based on the assigned product category. | 10-13-2011 |
Wubing Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20090000230 | High Intensity Bamboo Wood Laminated Flooring - The present invention relates to a kind of high intensity bamboo wood laminated flooring which fully utilizes bamboo and wood. The structure includes a filling layer made from bamboo wood veneer and other bamboo wood materials, a groove at one side of the filling layer, a flange at the other side of the filling layer, and an exterior decorative layer above the filling layer. The product takes full advantage of bamboo and wood as raw materials. This premium product possesses nature texture, color and luster of timber, and its mechanical performance and decorative effect are equivalent to or even exceeding solid wood flooring, which means it has enormous economic and social value. | 01-01-2009 |
Xiafeng Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20120078715 | ADVERTISING SERVICE BASED ON CONTENT AND USER LOG MINING - A system and method are disclosed for providing documents related to a search request. The search request may include a search query of one or more keywords, or the search request may be a demographic search query including one or more demographic attributes. An index containing data crawled from publisher's websites, demographic information of registered users, along with the search history of the registered users can be created. Once a search request is received, the search request can be compared to the information stored in the index, and one or more documents related to the request can be provided. | 03-29-2012 |
Xiao Jun Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20100083266 | METHOD AND APPARATUS FOR ACCESSING A SHARED DATA STRUCTURE IN PARALLEL BY MULTIPLE THREADS - A method of accessing a shared data structure in parallel by multiple threads in a parallel application program is disclosed, in which a lock of the shared data structure is granted to one thread of the multiple threads, an operation of the thread which acquires the lock is performed on the shared data structure, then an operation of each thread of the multiple threads which does not acquire the lock is buffered, and finally the buffered operations are performed on the shared data structure when another thread of the multiple threads subsequently acquires the lock. By using this method, the operations of other threads which do not acquire the lock of the shared data structure can be buffered automatically when the shared data structure is locked by one thread, and all the buffered operations can be performed when another thread acquires the lock. Therefore when the shared data structure is modified, the occurences of an element shift in the shared data structure can be greatly reduced and the access performance of the multiple threads can be improved. A corresponding apparatus and program product are also disclosed. | 04-01-2010 |
| 20110131378 | Managing Access to a Cache Memory - Managing access to a cache memory includes dividing said cache memory into multiple of cache areas, each cache area having multiple entries; and providing at least one separate lock attribute for each cache area such that only a processor thread having possession of the lock attribute corresponding to a particular cache area can update that cache area. | 06-02-2011 |
Xiaoming Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20090290627 | CODE EVALUATOR, CODE EVALUATION METHOD, RADIO COMMUNICATION SYSTEM, BASE STATION AND MOBILE STATION - The present invention relates to a code evaluation method comprising the steps of computing an auto-correlation function from a generated code; computing an evaluation reference value for determining quality of the generated code based on the auto-correlation function and a weighting factor determined depending on the evaluation reference value; and determining the quality of the generated code based on the evaluation reference value. | 11-26-2009 |
Xiaowei Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20120059600 | STRUCTURAL DAMAGE DETECTION SYSTEM, DEVICE AND METHOD - The present invention relates to a structural damage detection method for detecting damage of a structure. The method comprises scanning the surface of the structure with a tapper tapping with a tapping force at a predetermined frequency band while scanning; measuring the response signals transmitted from the surface of the structure; transforming the measured signals to acquire the signal spectrum at each position of the structure surface; intercepting from the signal spectrum a spectrum envelope; calculating a damage indicator at each position of the structure surface; and determining a position where the damage indicator changes abruptly as a position of structural damage. The present invention further relates to a structural damage detection system utilizing the structural damage detection method and a structural damage detection device for use therein. | 03-08-2012 |
Zhude Dai, Beijing CN
| Patent application number | Description | Published |
|---|---|---|
| 20090283694 | DOUBLE-FACED ION SOURCE - Disclosed is an ion source comprising a plate-shaped source body which has radioactivity on its both sides and allows positive and negative ions to penetrate through the source body. The present invention gives beneficial effects. First, the ion source structure can improve the ionization efficiency of sample molecules, and the generated sample ions have a centralized distribution within a flat space on both sides of the source body. Such distribution of ion cloud facilitates to improve the IMS sensitivity. Meanwhile, the source body of the present invention has a transmittance in itself. Thus, positive and negative ions generated on both sides of the source body can penetrate through the source body and be separated to the both sides of the source body. In this way, it is possible to improve the utilization efficiency of ions. | 11-19-2009 |
| 20090309013 | Electrode structure for drift tube in ion mobility spectrometer - Disclosed is an electrode structure for a drift tube in IMS comprising a ring electrode, for each of two surfaces of the ring electrode, at least a part adjacent to the inner radius is formed into a cone, and the angles formed between the cones and the axis of the ring electrode are different from each other. The electrode structure of the present invention can alleviate, even eliminate, the accumulation of space charges in the drift tube. Such structure is particularly suitable when the electric field in the drift tube is low in strength or a great number of ions pass through. Meanwhile, the structure allows a significant decrease in the size of the outer radius of the electrode, while the inner radius remains constant. In this way, it is possible to effectively reduce the outline size of the drift tube and thus make the IMS compact. | 12-17-2009 |
| 20100065755 | Array-based ion storage system and method therefor - An array-based ion storage system and method are disclosed. The system comprises: an ion generation section; and an ion storage section comprising a first end electrode coupled to the ion generation section and formed as having a plurality of holes, a second end electrode formed as having a plurality of holes, an intermediate electrode formed as having a plurality of holes, a first insulator formed in the shape of a ring and sandwiched between the first end electrode and the intermediate electrode to insulate them from each other, and a second insulator formed in the shape of a ring and sandwiched between the intermediate electrode and the second end electrode to insulate them from each other. With the present invention, the ion storage section can be made thinner to facilitate consistency in ion extraction and reduce the spread of ion mobility spectrum peak. In addition, the first and second insulators each have a big hole, and thus the ions cannot bump onto the insulation material at both sides at the time of ion vibration or thermal movement in the storage space. Therefore, charge transfer and accumulation at the insulator and the subsequent discharge will not occur, suppressing instability of storage and loss of ions. | 03-18-2010 |
| 20100102219 | ION GATE FOR DUAL ION MOBILITY SPECTROMETER AND METHOD THEREOF - Disclosed is an ion gate for a dual IMS and method. The ion gate includes an ion source, a first gate electrode placed on one side of the ion source, a second gate electrode placed on the other side of the ion source, a third gate electrode placed on the side of the first gate electrode away from the ion source, a fourth gate electrode placed on the side of the second gate electrode away from the ion source, wherein during the ion storage, the potential at the position on the tube axis of the ion gate corresponding to the first gate electrode is different from the potentials at the positions on the tube axis corresponding to the ion source and the third gate electrode, and the potential at the position on the tube axis corresponding to the second gate electrode is different from the potentials at the positions on the tube axis corresponding to the ion source and the fourth gate electrode. According to the present invention, after sample gas enters the ion gates, charge exchange with reaction ions occurs between the first gate electrode and the second electrode, and positive and negative ions are continuously stored into the storage regions for the positive and negative ions. This leads to an improvement of utility rate of ions. Then, the ions are educed in a step-wise manner from the storage regions for the positive and negative ions by a simple control of a combination of the electrodes. | 04-29-2010 |