Abstract: The present invention discloses a high step-down modular DC power supply, belonging to the field of power electronics technology, and the high step-down modular DC power supply includes an upper modular cascade circuit string, a lower modular cascade circuit string, a load, and an input source, where the upper modular cascade circuit string includes i upper sub-module circuits, and the lower modular cascade circuit string includes j lower sub-module circuits. A combination manner of module circuits includes: upper module string cascading, lower module string cascading, and hybrid cascading of the upper module string and the lower module string. The power supply is formed to be a high voltage step-down ratio power supply with high voltage direct current input and low voltage direct current output through modular cascading.

Abstract: A combined catalytic viscosity reducing system includes a catalyst slug, a heat generating system slug, a gas injection slug, and a water-soluble viscosity reducing system slug. The catalyst slug includes 10%-15% of azacarbene iron, 15%-30% of tert-butyl hydroperoxide, 2%-5% of phosphoric acid, 2%-5% of hydrogen donor, and 0.5%-1% of emulsifier agent, and the others are solvent. The heat generating system slug includes 10%-30% of NaNO2, 8%-25% of NH4Cl, and 3%-10% of acid initiator, and the others are water, totaling 100%. The water-soluble viscosity reducing system slug, according to mass percentage, includes 0.2%-0.5% of surfactant and 2%-10% of alkali, and the others are water. The combined catalytic viscosity reducing system can effectively reduce viscosity without injecting steam, and the viscosity reduction rate can reach 96.5%.

Abstract: A black-box fuzzing testing method includes: generating a plurality of testcases; executing a target program based on each of the generated testcases to obtain a plurality of execution results; determining a plurality of execution paths of the target program using the execution results; and determining a code coverage of the target program from the execution paths.

Abstract: The invention proposed a space vector pulse width modulation (SVPWM) method for any level cascaded H-bridge inverter. The multilevel space vector diagram is re-divided, and the coordinates of the nearest three vectors (NTVs) are directly obtained by judging the position of the reference vector. The duty cycles of the NTVs is calculated through additional vector which is equivalent to the reference vector. Then, the switching states are obtained by zero-sequence component and coordinate transformation, and the desired reference vector is synthesized for the SVPWM modulation. The invention realizes multilevel modulation in Cartesian coordinates without any iterative calculation, and the calculation is independent of the level number. Furthermore, the locating of the reference vector and the calculation of the duty cycles are simplified, and the calculation complexity is reduced.

Abstract: The method for manufacturing the semiconductor structure includes: providing a substrate, and forming contact holes in the substrate; depositing a metal at a bottom of each contact hole, and performing a reverse sputtering treatment to form a metal layer; in the reverse sputtering treatment, metal atoms or metal ions are sputtered onto at least a part of a side wall of each contact hole; performing a annealing treatment, to cause the substrate reacts with the metal layer to form a metal silicide layer.

Abstract: A mobile edge computing method and apparatus are provided. The method which is implemented by a mobile edge computing (MEC) management network element includes: receiving an MEC virtualization resource request sent by a control plane of a target radio access network (RAN), wherein the control plane belongs to the target RAN to which user equipment (UE) is handed over, and the MEC virtualization resource request includes an MEC computing resource requirement of the UE; creating, based on the MEC virtualization resource request, a new virtual machine (VM) on an MEC server for the UE, wherein the new VM is used on the target RAN side after the handover; and sending first information of the new VM to the control plane, wherein the first information includes an ID of the new VM. According to the application, the efficiency of usage of resources during a handover of UE is significantly improved.

Abstract: Tandem catalysts for the dehydrogenation of alkanes and/or alcohols in tandem with selective hydrogen combustion are provided. Also provided are methods of making the catalysts and methods of using the catalysis for the dehydrogenation of alkanes and/or alcohols. The catalysts include a support having a surface, dehydrogenation catalysts particles dispersed on the surface of the support, and a porous selective hydrogen combustion catalyst overcoat on the dehydration catalyst particles. The catalysts couple dehydrogenation with selective hydrogen combustion in a sequence of reactions occurring in tandem to shift the equilibrium of the dehydrogenation towards higher conversion.

Abstract: The invention provides for treating HBV or HDV infection or inhibiting human sodium taurocholate co-transporting polypeptide (hNTCP) with a polymeric bile acid or salt thereof, and pharmaceutical compositions comprising a polymeric bile acid or salt thereof, and a second HBV or HDV medicament.

Abstract: Techniques for group message thread link administration are described. In one embodiment, an apparatus may comprise a client front-end component operative to receive a join invitation command associated with a group message thread from an administrator client device, the group message thread associated with a message thread identifier, the message thread identifier identifying the group message thread on a messaging system; and send a join invitation link to the administrator client device; and a group management component operative to generate a join invitation link in response to the join invitation command, the join invitation link comprising a thread invitation identifier, wherein the thread invitation identifier is a hash of the message thread identifier. Other embodiments are described and claimed.

Abstract: This application provides a cache decision method and apparatus. The method includes: receiving, by a policy control function PCF, first cache information sent by at least one local analytic function LAF. The first cache information includes a base station identifier, identifiers of first N1 pieces of application information that are accessed for a maximum quantity of times, and content corresponding to the identifiers of the N1 pieces of application information, where N1 is a positive integer. The method further includes determining, by the PCF, local cache content based on the first cache information and a capacity of a local cache. In this way, the cache hit rate can be effectively improved, transmission bandwidth and data transmission overheads can be greatly reduced, and users' experience improved.

Abstract: This invention provides a preparation method of a catalyst for preferential oxidization of CO in a hydrogen-enriched atmosphere, and a catalyst product obtained from the method and its applications thereof. Particularly, in this invention, a wide-temperature catalyst for preferential oxidization of CO in a hydrogen-enriched atmosphere is obtained by depositing one or more of an iron oxide, cobalt oxide, and nickel oxide as a promoter onto the surface of a supported Pt-group noble metal catalyst precursor via chemical vapor deposition or atomic layer deposition. In the wide-temperature catalyst, the active noble metal component has a content of 0.1 to 10 wt %, and the promoter has a content of 0.1 to 10 wt % in terms of the metal element thereof.

Abstract: Embodiments of the present invention disclose a data packet processing method and apparatus, and a device. The method includes: if a first data packet is received, determining a first cache queue that is in the first buffer and that is used to store the first data packet; buffering the first data packet in the second buffer if a state of the first cache queue is an invalid state, where a data amount of the first data packet is less than the capacity of the second buffer, and the state of the first cache queue is set to the invalid state when a current data amount of the first buffer reaches the capacity of the first buffer; and if a data amount of the second buffer reaches the capacity of the second buffer, sending all data packets that are in the second buffer to a control plane device.

Abstract: Techniques for group message thread link administration are described. In one embodiment, an apparatus may comprise a client front-end component operative to receive a join invitation command associated with a group message thread from an administrator client device, the group message thread associated with a message thread identifier, the message thread identifier identifying the group message thread on a messaging system; and send a join invitation link to the administrator client device; and a group management component operative to generate a join invitation link in response to the join invitation command, the join invitation link comprising a thread invitation identifier, wherein the thread invitation identifier is a hash of the message thread identifier. Other embodiments are described and claimed.

Abstract: A mobile edge computing method and apparatus are provided. The method which is implemented by a mobile edge computing (MEC) management network element includes: receiving an MEC virtualization resource request sent by a control plane of a target radio access network (RAN), wherein the control plane belongs to the target RAN to which user equipment (UE) is handed over, and the MEC virtualization resource request includes an MEC computing resource requirement of the UE; creating, based on the MEC virtualization resource request, a new virtual machine (VM) on an MEC server for the UE, wherein the new VM is used on the target RAN side after the handover; and sending first information of the new VM to the control plane, wherein the first information includes an ID of the new VM. According to the application, the efficiency of usage of resources during a handover of UE is significantly improved.