38results about How to "Limit number" patented technology

The invention relates to a method for treating raw water laden with impurities in a treatment facility including at least one step of placing water in contact with a powdered adsorbent agent in an agitated pre-contact area (2), a step of ballasted flocculation, a step of settling, extracting a mixture of sludge, ballast and the powdered adsorbent agent from the bottom of the settlement area (5), and inserting the mixture in a hydrocyclone (11), transporting the overflow consisting of a mixture of sludge and powdered adsorbent reagent from said hydrocyclone (11) to a transition area (14). The method also includes a step of recycling the mixture of sludge and powdered adsorbent agent from the transition area (14) in the pre-contact area (2), continuously measuring at least one datum showingthe concentration of powdered adsorbent agent in the pre-contact area (2), and a step of injecting a suspension of new powdered adsorbent agent in an aqueous medium upstream when the concentration ofpowdered adsorbent agent in the pre-contact area (2) is below a predetermined threshold value, as well as a step of acidifying said suspension of adsorbent agent.

The invention discloses a 9B / 10B coding method suitable for low-pass and band-pass channels, which is used for coding a 9-bit source sequence set into a 10-bit target sequence set, and the 10-bit target sequence set does not contain balance sequences' 1010101010 'and' 0101010101 '. The 9-bit source sequence set comprises a first type of 9-bit source sequence set, a second type of 9-bit source sequence set and a third type of 9-bit source sequence set. The first type of 9-bit source sequence set only contains 9-bit source sequences with difference values of 1 and-1, and after one-bit data '0' or '1' is inserted into the same position of each sequence in the first type of 9-bit source sequence set, the sequence is coded into a 10-bit target balance sequence; the second type of 9-bit source sequence set selectively only contains 9-bit source sequences with the difference value of 3 or only contains 9-bit source sequences with the difference value of-3, one bit of data '0' or '1' is inserted into each sequence in the second type of 9-bit source sequence set, and a pair of 10-bit target unbalanced sequences with the difference value of + / -2 is coded.

Provided is a multichannel configurable pulse generating method. The method comprises the steps of (1) dividing N pulse generating channels into mutual independent M sets, and enabling only one pulse output channel to be available for each set through a multichannel noise gate, wherein each set comprises P pulse generating channels,; (2) carrying out priority ranking on the P pulse generating channels contained in each of the M sets according to the control objects corresponding to the P pulse generating channels contained in the set; (3) setting the pulse widths and the pulse phases needed by the P pulse generating channels of each set respectively, wherein the pulse widths are detail numerical values, and the pulse phases are the phase difference values among the channels; (4) generating and outputting pulse signals with the width and phase needed by the channel with the highest priority firstly for each set, and then generating and outputting pulse signals with the width and phase needed by the channel with the second highest priority and so on until all the pulses of the P pulse generating channels of the set are output according to priority relationship in sequence.

The invention relates to a preparation method of bis-hydroxypropyl neopentyl glycol ether and belongs to the technical field of organic compound synthesis. According to the technical scheme of the preparation method of bis-hydroxypropyl neopentyl glycol ether, neopentyl glycol is adopted as a raw material, and a product of bis-hydroxypropyl neopentyl glycol ether is adopted as a solvent. A 3-(4-methoxyphenyl) phosphine catalyst is added. After that, propylene oxide is adopted as a chain extender for the synthesis of bis-hydroxypropyl neopentyl glycol ether. The method is applied to the synthesis of bis-hydroxypropyl neopentyl glycol ether and has the advantages of high product content, low neopentyl glycol content, low content of allyl alcohol as a by-product, stable quality and the like.

The invention discloses a preparation method of hydroxypropylated pentaerythritol ether, and belongs to the technical field of synthesis of organic compounds. The preparation method comprises the following steps: by taking pentaerythritol as a raw material and recycling the hydroxypropylated pentaerythritol ether as a solvent, adding a tri(4-methoxyphenyl)phosphine catalyst, and taking epoxypropane as a chain extension agent for synthesizing the hydroxypropylated pentaerythritol ether. The preparation method disclosed by the invention is applied to synthesis and preparation of the hydroxypropylated pentaerythritol ether, and has the advantages of simple process, easiness in industrial implementation, high content of a product, low content of the pentaerythritol, low contents of propenol side products, stable quality and the like.

A method and device for detecting faults in a transmission line by reflectometry, include the following steps: injecting into the transmission line a reference signal at an emission frequency fDAC; collecting a reflected signal at a point on the transmission line; sampling the reflected signal at a sampling frequency fADC, the sampling frequency fADC being different from the emission frequency fDAC; storing each point of the sampled signal at a memory address corresponding to an index assigned to the point of the sampled signal and according to a precomputed memory-address increment Δ, the memory-address increment Δ depending on the emission frequency fDAC, on the sampling frequency fADC, on an over-sampling factor Ω and on a preset acquisition time Σ; repeating the storing step during the acquisition time Σ; and generating, from the points stored during the acquisition time, a recomposed signal able to be used to detect faults.

The invention provides a loading flow control method used among gateways in a local, which includes the following steps of calculating the usable numbers for the virtual terminal marks among the gateways in the local; selecting a gateway pair according to the useable numbers when a soft exchange sets up an intermediate loading among the gateways in the local for the calling spanning the gateways in the local; and distributing the virtual terminal marks of the usable numbers on the selected gateway pair in the local, thus further controlling the loaded flow among the gateways in the local by the distribution on the number of the virtual terminal marks. The invention also provides a loading flow control device used among the gateways in the local.

This invention discloses a resistance field emission electron negative electrode part, which is characterized by that the electron negative electrode part is located with row electrode or line electrode and it sets resistance between the row and down electrode or line or down electrode. The feedback action of the resistance can stabilize the emission and when row electrode is loaded with negative voltage and the line electrode is loaded with positive voltage, the electron injects form down electrode to the transmission layer and is accelerated and achieves the upper electrode and the part of electrons passes the upper electrode and are emitted to the vacuum.

The invention relates to a method for diagnosing faults of compressor air valves based on a Bayesian network, which uses a mixed method to learn the Bayesian structure, and applies the Bayesian network model to the fault diagnosis of air valves. The specific method steps are as follows: 1. Obtain the vibration signal sample and preprocess the signal; 2. Extract the fault feature vector and discretize the feature vector; 3. The attribute variables and class variables are used as Bayesian network nodes, using conditional independence Test to find the candidate parent node set of each node; 4. Use the greedy algorithm to determine the parent node of each node in turn, and construct the Bayesian network model; 5. Through the learning of the Bayesian network parameters, calculate the maximum posterior test probability. The present invention effectively limits the number of candidate parent nodes by using the low-order conditional independence (CI) test, avoids unnecessary structural scoring, and verifies that the method works under the condition of information uncertainty through the application example of compressor gas valve fault diagnosis The following is valid.

The invention relates to a mobile delay tolerant network rapid message notification method based on shortcut and a mobile delay tolerant network rapid message notification device based on shortcut. The method comprises steps that: a detection message is sent by a message source to a mobile delay tolerant network; after the detection message is received by any node in the mobile delay tolerant network, the message source is updated by a detection node to time delay information of the detection node, and the detection message is stored in a forwarding queue; when the detection node meets a meeting node, whether shortcut is established between the detection node and other nodes is determined; whether the detection node and the meeting node meet shortcut establishment requirements is determined; when the detection node receives a notification message, if the detection node is an end node, the notification message is forwarded to another end node through shortcut, if the detection node is not an end node, the notification message is stored by the detection node in the forwarding queue, and the notification message is forwarded to other nodes when the detection node meets other nodes. According to the method and the device, rapid forwarding of the notification message is realized through establishing the safe shortcut.