Abstract: The present disclosure provides a speaker box. The speaker box includes an upper housing, a lower housing forming an accommodating space together with the upper housing, and a speaker unit accommodated in the accommodating space. The speaker unit includes a diaphragm configured to vibrate and produce sound. The diaphragm is disposed separately from the upper housing to define a front acoustic cavity. The speaker box further includes a sound channel communicating the front acoustic cavity with an external environment. The front acoustic cavity and the sound channel constitute a front cavity of the speaker box together. A baffle fixedly connected to the upper housing is disposed in the sound channel. The baffle and the upper housing define a resonant cavity in communication with the front acoustic cavity, and the resonant cavity has an inlet facing to the front acoustic cavity.

Abstract: The present disclosure provides a speaker. The speaker includes a basket having an accommodating space, a vibration system and a magnetic circuit system which are accommodated in the accommodating space. The magnetic circuit system includes a yoke fixedly connected to the basket, a main magnetic steel assembled to the middle of the yoke, and a main pole core attached to a surface of the magnet away from the yoke. The main magnetic steel has a first leakage hole formed in a vibration direction of the vibration system, and the main pole core has a second leakage hole formed at a position corresponding to the first leakage hole. The first leakage hole and the second leakage hole are in communication with each other.

Abstract: The present disclosure provides devices, systems and methods for automated processing of biological samples. This disclosure provides a gel-frame cassette for an automated bioprocessing device, comprising: a gel-frame comprising: a front face, a back face, a frame comprising: two vertical side bars, each comprising a gel-frame holding hole, a top bar connecting the two vertical side bars, a bottom bar connecting the two vertical side bars and a hollow chamber enclosed by the two vertical side bars, the top bar, and the bottom bar; a front panel in contact with the front face of the gel-frame, the front panel comprising an expanded upper portion, and a back panel in contact with the back face of the gel-frame, the back panel comprising a horizontal opening at the bottom of the back panel. This disclosure also provides an automated bioprocessing machine that processes the gel-frame cassette or the gel-frame.

Abstract: The invention provides a first-order phase-transition La(Fe,Si)13-based magnetocaloric material showing small hysteresis loss, and preparation and use thereof. The material has a NaZn13-type structure, is composed of granules with a particle size in the range of 15˜200 ?m and not less than 15 ?m, and is represented by chemical formula La1-xRx(Fe1-p-qCopMnq)13-ySiyA?. The method for preparing the material comprises steps of preparing the material La1-xRx(Fe1-p-qCopMnq)13-ySiyA? by smelting and annealing; and then crushing the material into powder with a particle size in the range of 15˜200 ?m. Without changing the components, a La(Fe,Si)13-based magnetocaloric material showing small hysteresis loss and strong magnetocaloric effect can be obtained by adjusting the particle size within the range of 15˜200 ?m. Utilization of this type of materials in the practical magnetic refrigeration application is of great significance.

Abstract: The invention provides a first-order phase-transition La(Fe,Si)13-based magnetocaloric material showing small hysteresis loss, and preparation and use thereof. The material has a NaZn13-type structure, is composed of granules with a particle size in the range of 15˜200 ?m and not less than 15 ?m, and is represented by chemical formula La1-xRx(Fe1-p-qCopMnq)13-ySiyA?. The method for preparing the material comprises steps of preparing the material La1-xRx(Fe1-p-qCopMnq)13-ySiyA? by smelting and annealing; and then crushing the material into powder with a particle size in the range of 15˜200 ?m. Without changing the components, a La(Fe,Si)13-based magnetocaloric material showing small hysteresis loss and strong magnetocaloric effect can be obtained by adjusting the particle size within the range of 15˜200 ?m. Utilization of this type of materials in the practical magnetic refrigeration application is of great significance.

Abstract: A method and apparatus for testing a conference server. A plurality of test tone signals are generated. In one embodiment each test tone signal comprises the sum of at least two distinct frequency signals. Each test tone signal is employed to simulate a participant and the test tone signals are applied to a plurality of inputs of the conference server. At least some of the test tone signals are combined by the conference server to produce a corresponding plurality of test output signals. The test output signals are analyzed to identify whether the proper test tone signals are present within the respective test output signals. The generation of test tone signals and the analysis of the conference server outputs may be automated to facilitate rapid testing of conference server functionality. An indication of the test results are generated.

Abstract: A method and apparatus for testing a conference server. A plurality of test tone signals are generated. In one embodiment each test tone signal comprises the sum of at least two distinct frequency signals. Each test tone signal is employed to simulate a participant and the test tone signals are applied to a plurality of inputs of the conference server. At least some of the test tone signals are combined by the conference server to produce a corresponding plurality of test output signals. The test output signals are analyzed to identify whether the proper test tone signals are present within the respective test output signals. The generation of test tone signals and the analysis of the conference server outputs may be automated to facilitate rapid testing of conference server functionality. An indication of the test results are generated.