Abstract: This invention discloses a digital to analog converter (DAC) for converting a digital signal with a predetermined number of bits to a corresponding analog signal, the DAC comprises a first current source element having a first control signal, the first control signal controlling the conduction current provided by the first current source element, and a second current source element having a second control signal, the second control signal controlling the conduction current provided by the second current source element, wherein the first and the second control signals have different voltages during operation of the DAC.

Abstract: Proteins isolated from Coprinus clostophyllus having prolyl oligopeptidase activity, nucleic acids encoding the protein and methods for producing and using the protein, wherein SEQ ID NO:5, SEQ ID NO:6 and SEQ ID NO:10 must be contained therein to at least 60% similarity. The proteins and nucleic acids have improved heat stability and perform more favorably in vivo having optimum activity conditions around 40 degrees centigrade and around pH 7, and can therefore be used in medicaments for the treatment of celiac disease caused by proline abundant gluten or other applications.

Abstract: A method of the present invention enables every object on a digital map to be set with qualitative attributes comprised of geographical and descriptive properties and data of telecommunications. When browsing through the digital map to query for a designated object on an electronic (such as a computer, PDA, or mobile phone), the resulted digital map of location and corresponding qualitative attributes as well as data of telecommunication of the designated object are displayed on the screen of the electronic device. By simply selecting (clicking or double clicking) the data of telecommunications of the designated object, the modem circuits and related driving mechanisms of the electronic device are actuated to establish connections to the telephone system or the internet system enabling telecommunications through the telephone numbers, the homepages or the internet instant messengers (such as MSN, ICQ, Skype and the like) of the object for further immediate and direct contact.

Abstract: A language learning method is disclosed. The method includes providing a persistent environment such that when a player enters the persistent environment, an interaction between the player and the persistent environment is based on the player's level of a language skill.

Abstract: A communication system comprises a bridge device being configured to manage multi-channel communications, a host terminal coupled to the bridge device through a first network, a participant terminal coupled to the bridge device through a second network, and a broadcasting device coupled to at least one of the host terminal and the bridge device for broadcasting at least one of the participant signals from the participant terminal and the host signals from the host terminal. The host terminal is configured to receive host signals and to transmit the host signals to the bridge device. The participant terminal is configured to receive participant signals and to transmit the participant signals to the bridge device.

Abstract: The present invention discloses methods for enhancing the wear-resistance of polymers, the resulting polymers, and in vivo implants made from such polymers. One aspect of this invention presents a method whereby a polymer is irradiated, preferably with gamma radiation, then thermally treated, such as by remelting of annealing. The resulting polymeric composition preferably has its most oxidized surface layer removed. Another aspect of the invention presents a general method for optimizing the wear resistance and desirable physical and/or chemical properties of a polymer by crosslinking and thermally treating it. The resulting polymeric compositions is wear-resistant and may be fabricated into an in vivo implant.

Abstract: The present invention discloses a method for enhancing the wear-resistance of polymers by crosslinking them, especially before irradiation sterilization. In particular, this invention presents the use of chemically crosslinked ultrahigh molecular weight polyethylene in in vivo implants.

Abstract: The present invention presents methods for making oxidation-resistant and wear-resistant polyethylenes and medical implants made therefrom. Preferably, the implants are components of prosthetic joints, e.g., a bearing component of an artificial hip or knee joint. The resulting oxidation-resistant and wear-resistant polyethylenes and implants are also disclosed.

Abstract: A syringe needle device comprises a needle, a ring and a cover, wherein a needle seat of the needle can be engaged with the cover, a stopping portion is mounted on the needle seat for stopping the ring, thereby the needle is retained in the cover after taking out the ring and mounting on the cover.

Abstract: The current-folded mixer of this invention comprises an input stage and a switching stage. The input stage receives a radio frequency input RF and generates a modulated bias current to the switching stage. The switching stage has a switching pair, connected to a common node, to receive an input signal and said modulated bias current to generate an output signal in accordance with the input signal and the modulated bias current. The current-folded mixer uses a capacitor to separate the bias current of the input stage and the switching stage and an inductor in the switching stage to supply bias current.

Abstract: The present invention discloses methods for enhancing the wear-resistance of polymers, the resulting polymers, and in vivo implants made from such polymers. One aspect of this invention presents a method whereby a polymer is irradiated, preferably with gamma radiation, then thermally treated, such as by remelting of annealing. The resulting polymeric composition preferably has its most oxidized surface layer removed. Another aspect of the invention presents a general method for optimizing the wear resistance and desirable physical and/or chemical properties of a polymer by crosslinking and thermally treating it. The resulting polymeric compositions is wear-resistant and may be fabricated into an in vivo implant.

Abstract: The present invention discloses methods for enhancing the wear-resistance of polymers, the resulting polymers, and in vivo implants made from such polymers. One aspect of this invention presents a method whereby a polymer is irradiated, preferably with gamma radiation, then thermally treated, such as by remelting of annealing. The resulting polymeric composition preferably has its most oxidized surface layer removed. Another aspect of the invention presents a general method for optimizing the wear resistance and desirable physical and/or chemical properties of a polymer by crosslinking and thermally treating it. The resulting polymeric compositions is wear-resistant and may be fabricated into an in vivo implant.

Abstract: A DNA molecule encoding transglutaminase, a transglutaminase, an expression vector containing the DNA molecule, and a cell containing the expression vector.

Abstract: A blow-molded table includes a table board, and two opposite support units each foldably mounted on a bottom of the table board. Each of the two support units includes a support stand pivotally mounted on either one of two ends of the table board, and a support member pivotally mounted on a mediate of the table board and pivotally connected with the support stand. Thus, the blow-molded table is supported rigidly and stably when being expanded and is folded when not in use.

Abstract: The circuit design platform of this invention comprises: a portal provided with a network platform to install functional modules and to allow users to utilize said functional modules after login; a circuit design tool module to connect at least one circuit design software and to generate a circuit design descriptive data file; a circuit design database connection module to connect at least one circuit design database; a circuit design simulation module to connect at least one circuit design simulation software; an integrated circuit manufacture connection module to connect website of at least one integrated circuit manufacturer and to provide at least one integrated circuit processing attributes analysis tool to suggest suited manufacture process; a circuit test connection module to connect at least one circuit test service provider to conduct online or offline tests; and a management module for management and fee calculation of access of the above functional modules.

Abstract: The cover lens and the back panel of a rear lamp set are molded to form chambers of predetermined sizes to accommodate safety sensors therein, so that the safety sensors and the rear lamp sets are integrally assembled to a vehicle without spoiling the esthetic appearance of the tail portion of the vehicle. The built in safety sensors, such as cameras, distance detecting devices and sonar sets, help a driver to understand conditions around the tail portion of the vehicle.

Abstract: The current-folded mixer of this invention comprises an input stage and a switching stage. The input stage receives a radio frequency input RF and generates a modulated bias current to the switching stage. The switching stage has a switching pair, connected to a common node, to receive an input signal and said modulated bias current to generate an output signal in accordance with the input signal and the modulated bias current. The current-folded mixer uses a capacitor to separate the bias current of the input stage and the switching stage and an inductor in the switching stage to supply bias current.