32results about How to "Improve sensitivity performance" patented technology

One aspect of the invention is a homodyne coherent receiver, suitable for high speed phase shift keying (PSK), the receiver comprising a receiver for receiving an incoming signal having a carrier-less modulation format, a signal conditioning sub-system that generates a carrier component from the incoming signal, and an optical injection phase locked loop (OIPLL) that phase locks the generated carrier component of the incoming signal. Embodiments of the invention may enable DSP free detection of optical PSK signals, which may be required in next generation fiber transmission systems and in optical constellation analyzer systems. In addition, embodiments of the invention may provide improved receiver sensitivity performance comparing to prior art systems using direct detection schemes. Also, embodiments of the invention may be advantageous in terms of cost and energy efficiency.

The invention discloses a GNSS signal capturing and tracking method and system based on a dual-polarized antenna. The GNSS signal capturing method comprises the steps of receiving RHCP signals and LHCP signals through the RHCP antenna part and the LHCP antenna part respectively, capturing satellite signals based on the RHCP signals, extracting the serial numbers of non-captured satellites, prolonging the integral time, capturing signals of the non-captured satellites based on the RHCP signals and the LHCP signals, and capturing the signals of the same satellite or the signals of the different satellites respectively and synchronously based on the RHCP signals and the LHCP signals respectively. According to the GNSS signal capturing and tracking method and system based on the dual-polarized antenna, the direct signals and the echoed signals are synchronously received, and the satellite signals are processed and positioning is carried out based on the direct signals and the echoed signals. By adopting the GNSS signal capturing and tracking method and system based on the dual-polarized antenna, under the conditions of serious multi-path fading and poor signal environments, the sensitivity of a GNSS receiver can be improved under weak signal environments and complex signal environments such as cities and rooms.

The invention discloses an energetic type metal-organic framework material and a preparation method thereof. The complex consists of five metal ions Co(II), four 2,2'- binitro-4, 4'-biphenyldicarboxylic acid ligands, six coordinated water, two hydroxyls and sixteen crystal water. The preparation method for the energetic type metal-organic framework material comprises the following steps: adding the ligands into H2O, regulating the pH by use of LiOH, then, adding Co(NO3)2.6H2O, sufficiently stirring, placing into a stainless steel reaction kettle with a polytetrafluoroethylene lining; heating the stainless steel reaction kettle to 150 DEG C in a programmed manner and keeping the temperature for 48 hours, cooling the stainless steel reaction kettle to the room temperature in the programmed manner, leaving purple pink cubic crystal particles on the lining wall, filtering, washing and drying in the air to obtain the complex. The brisance and the work capability of the energetic material prepared by the preparation method are improved.

A speaker module comprising a module housing is disclosed. A speaker unit is accommodated within the module housing. A sound hole of the module is located at a side of the speaker unit. The speaker unit divides a cavity of the entire module into two cavities, namely a front acoustic cavity and a rear acoustic cavity. The front acoustic cavity is in communication with the sound hole. A sound-absorbing cotton is provided in the front acoustic cavity. The sound-absorbing cotton is fixed on the module housing, and is arranged to avoid a vibration space of a diaphragm of the speaker unit. The present invention effectively improves the performance of a sensitivity curve of the module at high frequencies without modifying the structure of the front acoustic cavity, thus not only increasing the acoustic performance of the module, but also simplifying the structure of the front acoustic cavity of the module.

The invention provides an active matching thickness mould pressing electropneumatic coupling ultrasonic transducer. The active matching thickness mould pressing electropneumatic coupling ultrasonic transducer comprises a piezoelectric plate (1), a first matching layer (2), a second matching layer (3), a transducer shell (4), a first joint (5) and a second joint (6); the piezoelectric plate (1), the first matching layer (2) and the second matching layer (3) are sequentially arranged in the transducer shell (4) in the emission direction of ultrasonic signals, the first matching layer (2) is of a round sheet structure made of microhole foaming materials, the second matching layer (3) is of a round sheet structure made of a polarization multi-hole PVDF thin film, the second matching layer (3) is communicated with the second joint (6) through a wire, and the diameter of the first matching layer (2) and the diameter of the second matching layer (3) are the same with that of the piezoelectric plate (1). According to the transducer, an active matching layer material is introduced, transmission sound waves can be actively amplified, and the sensitivity can be improved.

Disclosed is a method for fabricating a high-performance field-effect transistor biosensor for diagnosing cancers using micro conductive polymer nanomaterials funtionalized with anti-VEGF aptamer. Disclosed is a high-sensitivity field-effect transistor biosensor for diagnosing cancers using a micro conductive polymer nanomaterial transistor array including a micro polymer nanomaterial transistor array including a channel region provided with a metal source electrode, a metal drain electrode, a gate and micro polymer nanomaterials, and an anti-VEGF aptamer covalently bound to the surface of the micro polymer nanomaterials constituting the channel region of the micro polymer nanomaterials transistor array, to target VEGF (Vascular endothelial growth factor).

The invention provides a method for eliminating harmonic interference. The comprises the steps of determining a harmonic shifting amount which is a difference between a harmonic interference frequency point and a central frequency point of a receiving signal; determining the harmonic amplitude and the harmonic phase of a harmonic interference signal included in the receiving signal according to the receiving signal and the harmonic shifting amount; determining the harmonic interference signal according to the harmonic amplitude and the harmonic phase; and subtracting the harmonic interference signal from the receiving signal, thus eliminating the harmonic interference signal in the receiving signal. Therefore, according to the method provided by the invention, interference to the receiving signal caused by the harmonic signal is effectively solved, and the sensitivity performance of a receiver is improved, so that the performance of the receiver is not influenced by the strength of the harmonic signal, and the receiver has high robustness.

Disclosed is a method for detecting 1,8-diaminonaphthalene based on an electrochemical DNA biosensor. The invention belongs to the technical field of electrochemical detection and chemical sensors for detecting 1,8-diaminonaphthalene based on a gold electrode modified by hairpin DNA, and relates to preparation of the gold electrode modified by hairpin DNA which has an electrochemical response to the 1,8-diaminonaphthalene and detection of the 1,8-diaminonaphthalene by adopting the electrode. Specifically, the preparation of the gold electrode comprises using hairpin DNA modified by dithio as a raw material, and self-assembling on the gold electrode surface through the action of gold-sulfur bonds to prepare the electrode modified by the hairpin DNA. Changes in impedance of a DNA film are caused by interaction between the electrode modified by the hairpin DNA and the 1,8-diaminonaphthalene, and detection of 1,8-diaminonaphthalene can be carried out according to responded changes in the impedance. A method for preparing the DNA biosensor of the invention has the advantages of mild conditions, simplicity and convenience, good stability, high sensitivity and simple operation.

The invention relates to a radio frequency system, an antenna switching method and client front-end equipment, and the radio frequency system comprises a receiving module which is used for receiving and processing a radio frequency signal; M antennas, wherein each antenna of the M antennas and the receiving module are connected with the radio frequency transceiver, the M antennas are configured with M ports, and the M antennas are connected with the M ports in a one-to-one correspondence manner through the receiving module to form a preset receiving transmission path of each antenna; configuration information of a preset receiving transmission path is stored in the radio frequency transceiver, the radio frequency transceiver is further used for determining a target transceiving antenna group according to the radio frequency signal received by each port, the target transceiving antenna group comprises N antennas, wherein N is greater than or equal to 2 and less than M. According to theinvention, the insertion loss of a radio frequency front-end circuit in a radio frequency system can be reduced, the sensitivity performance is improved, and the communication performance of the radiofrequency system is further improved.

The invention discloses a fluorescent probe for monitoring apoptosis as well as a preparation method and application of the fluorescent probe. The fluorescent probe comprises a DNA tetrahedral nucleicacid framework nanostructure with three probe binding arms, a Cy3-modified DNA single chain as a positioning probe, a cytochrome c probe and a telomerase probe, the positioning probe, the cytochromec probe and the telomerase probe are combined with three probe combination arms of the DNA tetrahedron nucleic acid framework nano structure through nucleic acid complementary hybridization, the cytochrome c probe comprises a cytochrome c aptamer chain and a hybrid double chain of a cytochrome c capture chain, and the telomerase probe comprises a telomerase capture chain, a telomerase template chain and a hybrid double chain of a telomerase dye chain. The DNA tetrahedron nucleic acid framework type cell apoptosis whole-process monitoring fluorescence probe has the characteristics of high sensitivity, good stability, strong selectivity and low toxicity, and shows good application performance in the aspects of cell apoptosis monitoring, drug evaluation and screening and the like.

The invention, which is applicable to the field of the communication technology, provides a wireless communication method and apparatus. The method comprises: a to-be-modulated data bit stream is modulated at a transmitting terminal to obtain a first complex signal corresponding to the data bit stream, a pseudo-random sequence is generated based on the data bit stream, and the pseudo-random sequence is modulated to obtain a second complex signal corresponding to the pseudo-random sequence; the first complex signal and the second complex signal are combined to form a physical frame; and then the physical frame is processed to obtain an analog signal and the analog signal is transmitted to a receiving terminal. The structure of the physical frame is simplified, so that the data redundancy ofthe data stream in the modulation process is reduced. The second complex signal is determined at the receiving terminal by a quick synchronous capturing method, digital feedback loop carrier recoveryis carried out on the first complex signal, and then channel error correction and decoding are carried out to obtain a demodulated data bit stream, so that the receiving and processing delay costs are lowered and the data throughput rate of the system and the flexibility of the data receiving are improved effectively.

Provided are an actinic ray-sensitive or radiation-sensitive resin composition including a compound (A) whose dissolution rate in an alkali developer decreases by the action of an acid, a resin (B) having a group that decomposes by the action of an alkali developer to increase the solubility in the alkali developer and having at least one of a fluorine atom or a silicon atom, and a resin (C) having a phenolic hydroxyl group, different from the resin (B), an actinic ray-sensitive or radiation-sensitive film and a mask blank, each formed using the actinic ray-sensitive or radiation-sensitive resin composition, a pattern forming method using the actinic ray-sensitive or radiation-sensitive resin composition, and a method for manufacturing an electronic device.

An imaging member, such as a negative-working printing plate or on-press cylinder, can be prepared using a hydrophilic imaging layer comprising a hydrophilic heat-sensitive polymer containing a crosslinking agent comprising ionic groups and epoxy groups. This polymer may comprise quaternary ammonium carboxylate groups which may include at least one substituted-alkylene(C₁-C₃)-phenyl group. The imaging member also includes an infrared radiation sensitive material to provide added sensitivity to heat that can be supplied by laser irradiation in the IR region. The heat-sensitive polymer may be “switchable” in response to heat, and provides a lithographic image without wet processing.

The invention provides a zinc-aluminum ion recognition fluorescent probe as well as a preparation method and application thereof. The molecule of the fluorescent probe contains a Schiff base structure and three benzyl groups. The zinc-aluminum ion fluorescent probe provided by the invention has the characteristics of double mechanisms, double response, high sensitivity, high specificity, no influence of other metal ions, easiness in cellular uptake, low cytotoxicity and the like. The probe is applied to peripheral blood of a prostate cancer patient, the zinc content in serum can be quantitatively detected, and valuable information is provided for diagnosis of a suspected prostate cancer patient. The probe is combined with prostate cancer serum PSA detection, so that the diagnosis accuracy of prostate cancer can be effectively improved, puncture diagnosis requirements of patients with serum PSA in a gray range are avoided, and excessive diagnosis and excessive treatment are avoided.

The present invention relates to a combination of biomarkers for diagnosing diabetic retinopathy and a use thereof, and more specifically to a combination of biomarkers for diagnosing diabetic retinopathy which is composed of two or more blood biomarkers specific for the diagnosis of diabetic retinopathy with increased diagnostic performance. In addition, the present invention relates to a composition for diagnosing diabetic retinopathy, a diagnostic kit and a method for providing information necessary for the diagnosis of diabetic retinopathy, using the combination of biomarkers. The combination of biomarkers for diagnosing diabetic retinopathy according to the present invention was confirmed to exhibit excellent sensitivity and diagnostic performance compared to other biomarker combinations, and it was also confirmed to exhibit high diagnostic capacity in early diabetic retinopathy when the protein quantitative values of the combination of biomarkers and the basic clinical information were combined and analyzed.

The invention discloses a temperature sensor based on a twisted double-core optical fiber. The temperature sensor comprises a double-core optical fiber, tapering coupling areas at the two ends of the double-core optical fiber are connected with single-mode optical fibers respectively, two fiber cores of the double-core optical fiber are twisted to be spiral, the distances between the centers of the two fiber cores and the axis of the optical fiber are different, and formed spiral line screw pitches are different; and the group optical path difference of the signals in the two fiber cores approaches to zero. According to the invention, the optical fiber can obtain a high-sensitivity effect similar to a dispersion turning point without tapering.