Abstract: The present disclosure provides a method for experimentally determining a critical sand-carrying gas velocity of a shale gas well. The method includes: collecting well structure and production data, calculating parameter ranges of a gas flow velocity and a liquid flow velocity; carrying out a physical simulation experiment of sand carrying in the shale gas well to obtain the sand holding capacity of the wellbore under different experimental conditions, and calculating a sand holding rate; by observing a change curve of the sand holding rate of the wellbore vs. the gas flow velocity, defining a turning point, and sensitively analyzing the influence of other experimental variables on the turning point, to calculate the critical sand-carrying production of the shale gas well under different conditions. Therefore, this calculation method is simple and applicable, and provides a theoretical basis for the optimization design of water drainage and gas production process.

Abstract: A method and device for information processing. A server receives an information acquisition request sent by a viewing account. The information acquisition request includes a target multimedia information identifier. In response to the information acquisition request, the server acquires a total quantity, a first quantity, a second quantity, and a third quantity of comments in a first comment set corresponding to the target multimedia information identifier. The server determines a first target quantity according to the total quantity, the first quantity, the second quantity, and the third quantity. The first target quantity is a quantity of comments allowed to be displayed to the viewing account in the first comment set. The server sends the first target quantity the viewing account.

Abstract: A method and device for information processing. A server receives an information acquisition request sent by a viewing account. The information acquisition request includes a target multimedia information identifier. In response to the information acquisition request, the server acquires a total quantity, a first quantity, a second quantity, and a third quantity of comments in a first comment set corresponding to the target multimedia information identifier. The server determines a first target quantity according to the total quantity, the first quantity, the second quantity, and the third quantity. The first target quantity is a quantity of comments allowed to be displayed to the viewing account in the first comment set. The server sends the first target quantity the viewing account.

Abstract: This disclosure describes techniques to provide a regulator circuit using a component-on-top (CoP) package. The CoP package comprising a system-in-package (SIP) comprising regulator circuitry, the SIP having a top portion and a first side portion; and an inductor on the top portion of the SIP, wherein: the inductor is coupled to the regulator circuitry via the top portion of the SIP; and a first end of the inductor extends beyond the first side portion of the SIP.

Abstract: A cascaded configuration of regulator circuits can be co-integrated within a commonly-shared integrated circuit package (such as an integrated electronic module). Such co-integration can include placing a switched-mode regulator circuit in close proximity to a linear regulator circuit. Magnetic field coupling between the regulator circuits is generally a non-linear function of a separation between the circuits. The switched-mode regulator circuit can generate noise that may adversely impact the linear regulator output. Magnetic coupling between the regulator circuits within the module package can be suppressed or eliminated using a magnetic barrier. The barrier can be magnetically permeable and electrically non-conductive.

Abstract: This disclosure describes techniques to provide a regulator circuit using a component-on-top (CoP) package. The CoP package comprising a system-in-package (SIP) comprising regulator circuitry, the SIP having a top portion and a first side portion; and an inductor on the top portion of the SIP, wherein: the inductor is coupled to the regulator circuitry via the top portion of the SIP; and a first end of the inductor extends beyond the first side portion of the SIP.

Abstract: A cascaded configuration of regulator circuits can be co-integrated within a commonly-shared integrated circuit package (such as an integrated electronic module). Such co-integration can include placing a switched-mode regulator circuit in close proximity to a linear regulator circuit. Magnetic field coupling between the regulator circuits is generally a non-linear function of a separation between the circuits. The switched-mode regulator circuit can generate noise that may adversely impact the linear regulator output. Magnetic coupling between the regulator circuits within the module package can be suppressed or eliminated using a magnetic barrier. The barrier can be magnetically permeable and electrically non-conductive.

Abstract: A variable direct current (DC) link power converter is described. In one example, the power converter includes a first converter stage configured to convert power from a power source to power at an intermediate link voltage and a second converter stage configured to convert the power at the intermediate link voltage to power for charging a battery. The power converter further includes a control system having an intermediate link voltage regulation control loop configured, in a first mode of operation, to regulate the intermediate link voltage through the first converter stage based on a voltage of the battery, and a ripple regulation control loop configured to sense a charging current for the battery and regulate a gain of the second converter stage based on the charging current to reduce ripple in the charging current. A new configuration of transformer suitable for use with the power converter is also described.

Abstract: Critical-mode soft-switching techniques for a power converter are described. In one example, a power converter includes a converter electrically coupled between an alternating current (AC) power system and a direct current (DC) power system, where the converter includes a number of phase legs. The power converter can also include a control system configured, during a portion of a whole line cycle of the AC power system, to clamp a first phase leg of the converter from switching and operate second and third phase legs of the converter independently in either critical conduction mode (CRM) or in discontinuous conduction mode (DCM).

Abstract: Critical-mode soft-switching techniques for a power converter are described. In one example, a power converter includes a converter electrically coupled between an alternating current (AC) power system and a direct current (DC) power system, where the converter includes a number of phase legs. The power converter can also include a control system configured, during a portion of a whole line cycle of the AC power system, to clamp a first phase leg of the converter from switching and operate second and third phase legs of the converter independently in either critical conduction mode (CRM) or in discontinuous conduction mode (DCM).

Abstract: A variable direct current (DC) link power converter is described. In one example, the power converter includes a first converter stage configured to convert power from a power source to power at an intermediate link voltage and a second converter stage configured to convert the power at the intermediate link voltage to power for charging a battery. The power converter further includes a control system having an intermediate link voltage regulation control loop configured, in a first mode of operation, to regulate the intermediate link voltage through the first converter stage based on a voltage of the battery, and a ripple regulation control loop configured to sense a charging current for the battery and regulate a gain of the second converter stage based on the charging current to reduce ripple in the charging current. A new configuration of transformer suitable for use with the power converter is also described.