Abstract: Systems and methods for managing airflow for cooling computing devices (e.g. in a data center) in normal and cold environments are disclosed. In one embodiment, the method comprises positioning the computing devices on a plurality of racks with air barriers to create hot and cold aisles. The computing devices may be configured in a first mode to draw in cool air the cold aisles and exhaust heated air into the hot aisles. Temperatures in the cold aisles may be periodically measured. In response to temperatures below a predetermined threshold, one or more of the cold aisles may be converted into a temporary hot aisle by adjusting ventilation openings and configuring a subset of the computing devices to temporarily draw in warm air from the temporary hot aisle.

Abstract: A controller is configured to operate a heating, ventilation, and air conditioning (HVAC) system based on a measurement of a detected quantity of particulate matter from an air quality sensor in relation to a threshold value.

Abstract: A controller is configured to operate a heating, ventilation, and air conditioning (HVAC) system based on a first plurality of particulate matter measurements and a second plurality of particulate matter measurements. The controller is configured to determine an air filter efficiency for an air filter based on the received first plurality of particulate matter measurements and the received second plurality of particulate matter measurements. The controller is further configured to determine if a quantity of particulate matter in an airflow exceeds a first threshold value based on the received second plurality of particulate matter measurements. In response to determining that the quantity of particulate matter in the airflow does exceed the first threshold value, the controller is configured to transmit a notification indicating an action to inspect the air filter.

Abstract: An implantable medical device is provided. The implantable medical device includes a core having an antisense oligonucleotide (ASO) dispersed within a core polymer matrix. The core polymer matrix includes an ethylene vinyl acetate copolymer. The ASO includes one or more nucleosides attached via internucleoside linkages. At least 10% of the internucleoside linkages comprise chemically modified internucleoside linkages. The implantable device is capable of releasing about 5% to about 60% of the ASO after a time period of about seven days.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer-storage media, for improved network computing for network function testing. In some implementations, a method includes providing an application programming interface (API) to a user device of a network computing system; receiving input data from the user device indicating one or more application requirements for testing one or more network functions; generating one or more virtual processing machines using the one or more application requirements; obtaining testing data from one or more communication networks; providing the testing data to the one or more virtual processing machines configured to generate results based on processing the testing data using the one or more network functions; and providing the results to the user device.

Abstract: A method for dynamic estimation of time-to-completion may include: receiving historical ticket data for historical tickets, the historical ticket data comprising historical tasks for each historical ticket; assigning each of the historical tasks into one of a plurality of buckets based on a common feature; training, for each bucket, a trained machine learning engine to predict a time-to-completion for the tasks in the bucket; receiving a current ticket; determining a plurality of tasks and an order of executing the tasks for the current ticket; identifying one of the buckets for each of the tasks in the current ticket; predicting, for each task in the current ticket, the time-to-completion for the current using the trained machine learning engine for the bucket for the task; combining the time-to-completion for the tasks for the current ticket into a current ticket time-to-completion; and returning the current ticket time-to-completion for the current ticket.

Abstract: Disclosed herein are evaporator assemblies for heat pump systems. The evaporator units can comprise a housing defining an interior chamber, an air inlet and an air outlet. The air inlet and the air outlet can form an air flow path through the interior chamber, and an evaporator unit can be positioned within the interior chamber such that the air flow path contacts the evaporator unit. The air inlet having a semi-circular cross section through which air flows into the interior chamber, the semi-circular cross section having a straight edge and a curved edge. A velocity magnitude of the air flowing from the air inlet into contact with the evaporator unit can deviate less than 0.1 m/s from the average air velocity across the surface area of the evaporator.

Abstract: A system and method for recapturing waste heat from computing devices are disclosed. The system includes at least one computing device, a heating, ventilation, and air conditioning (HVAC) unit, an exhaust duct leading from the computing device to the HVAC unit, a bypass duct fluidly connected to the exhaust duct for bypassing the HVAC unit, a control valve disposed in the exhaust duct, and a controller operatively connected to the control valve. The control valve is switchable between an open position where a flow of exhaust air is sent to the HVAC unit, and a closed position where the flow of exhaust air is redirected to the bypass duct.

Abstract: A heat sink for cooling computing devices is disclosed. The heat sink includes a plurality of fin stages arranged in spaced relation between an intake side and an exhaust side. The plurality of fin stages each include a plurality of fins extending along a flow direction. At least one of the plurality of fin stages is distinct in fin width and/or fin height from another one of the plurality of fin stages.

Abstract: One example includes a testing method that includes connecting a capacitor having a first capacitance to an output terminal of an integrated circuit (IC). The method can also include generating pulse signal responsive to an enable signal provided at at least one input terminal of the IC and providing a drive signal to the output terminal to cause a linearly increasing voltage across the capacitor responsive to the pulse signal. The method can also include measuring a no-load delay. The method can also include measuring the linearly increasing voltage at the output terminal responsive to the drive signal. The method can also include determining a first capacitance charge time for the capacitor responsive to the linearly increasing voltage reaching a threshold and determining a second capacitance charge delay for a second capacitance based on the first capacitance charge time and the no-load delay.

Abstract: An implantable device for delivery of a therapeutic agent is provided. The device includes a core including a core polymer matrix within which is dispersed a therapeutic agent. The therapeutic agent includes one or more GLP-1 receptor agonists. The core polymer matrix includes an ethylene vinyl acetate copolymer having a melting temperature of from about 20° C. to about 100° C. as determined in accordance with ASTM D3418-15 and/or a melt flow index of from about 0.2 to about 100 grams per 10 minutes as determined in accordance with ASTM D1238-13 at a temperature of 190° C. and a load of 2.16 kilograms.

Abstract: A controller is configured to operate a heating, ventilation, and air conditioning (HVAC) system based on a first plurality of particulate matter measurements and a second plurality of particulate matter measurements. The controller is configured to determine an air filter efficiency for an air filter based on the received first plurality of particulate matter measurements and the received second plurality of particulate matter measurements. The controller is further configured to determine if a quantity of particulate matter in an airflow exceeds a first threshold value based on the received second plurality of particulate matter measurements. In response to determining that the quantity of particulate matter in the airflow does exceed the first threshold value, the controller is configured to transmit a notification indicating an action to inspect the air filter.

Abstract: A controller is configured to operate a heating, ventilation, and air conditioning (HVAC) system based on a plurality of concentration measurements received from a gas sensor, wherein the gas sensor is disposed within a sensor housing upstream of an evaporator coil. The controller is configured to receive the plurality of concentration measurements and determine if a concentration of total volatile organic compounds (TVOCs) in an airflow exceeds a first threshold value. The controller is further configured to operate the HVAC system in a second mode of operation to increase ventilation in response to determining that the concentration of TVOCs in the airflow does exceed the first threshold value, wherein a volume of air is introduced into and discharged from the HVAC system during the second mode of operation.

Abstract: A rack and system for cooling computing devices such as in a data center is disclosed. In one embodiment, the rack supports a plurality of computing devices and comprises a plurality of planar annular sector or trapezoidal shelves, each having one or more positions for holding computing devices. A number of vertical supports may hold the shelves in a vertically spaced arrangement, and an air barrier may be affixed to the rack. The air barrier may have openings for the computing devices to permit exhaust air to flow through the air barrier into a hot aisle. The rack maybe configured to be connected to other similar racks to form a vertical annular hyperboloid or a vertical hyperbolic annular paraboloid, and the computing devices may be installed to discharge exhaust at an angle relative to a centerline of the vertical annular hyperboloid or a vertical hyperbolic annular paraboloid to improve airflow.

Abstract: A heat sink for cooling computing devices such as in a data center is disclosed. The heat sink includes a plurality of fin stages arranged in spaced relation between an intake side and an exhaust side. The plurality of fin stages have a height that increases from the intake side to the exhaust side.

Abstract: One example includes a method for measuring a quiescent current in a switching voltage regulator. The method includes generating a mathematical model of a circuit design associated with the switching voltage regulator. The mathematical model includes measurable parameters to describe a switching current of a power switch of the switching voltage regulator. The method also includes fabricating a circuit comprising the switching voltage regulator based on the circuit design. The fabricated circuit includes the power switch and conductive I/O. The method also includes coupling the conductive I/O of the fabricated circuit to a circuit test fixture and providing electrical signals to the conductive I/O via the circuit test fixture. The method also includes measuring the measurable parameters in response to the electrical signals and applying the measurable parameters to the mathematical model to calculate the switching current.

Abstract: A system for cooling a two-dimensional array of computing devices is disclosed. A fan is configured to move air through the array of computing devices, which may be fan-less. The fan's width and height may correspond to the two-dimensional array's width and height. The two-dimensional array may be radially configured, and a shroud may be connected between the fan and the array of computing devices. The shroud may have profiles matching the fan and the array of computing devices.

Abstract: An analyte sensor is disclosed. The analyte sensor includes an implantable sensor configured to measure a signal indicative of an analyte concentration in a user and at least one membrane layer. The membrane layer is disposed over at least a portion of the sensor. The membrane includes a membrane polymer matrix including an ethylene vinyl acetate copolymer and a therapeutic agent dispersed within the membrane polymer matrix. The membrane layer is permeable to an analyte. Devices and methods for monitoring analytes are also disclosed.

Abstract: One example includes a method for measuring a quiescent current in a switching voltage regulator. The method includes generating a mathematical model of a circuit design associated with the switching voltage regulator. The mathematical model includes measurable parameters to describe a switching current of a power switch of the switching voltage regulator. The method also includes fabricating a circuit comprising the switching voltage regulator based on the circuit design. The fabricated circuit includes the power switch and conductive I/O. The method also includes coupling the conductive I/O of the fabricated circuit to a circuit test fixture and providing electrical signals to the conductive I/O via the circuit test fixture. The method also includes measuring the measurable parameters in response to the electrical signals and applying the measurable parameters to the mathematical model to calculate the switching current.

Abstract: Disclosed herein are evaporator assemblies for heat pump systems. The evaporator units can comprise a housing defining an interior chamber, an air inlet and an air outlet. The air inlet and the air outlet can form an air flow path through the interior chamber, and an evaporator unit can be positioned within the interior chamber such that the air flow path contacts the evaporator unit. The air inlet having a semi-circular cross section through which air flows into the interior chamber, the semi-circular cross section having a straight edge and a curved edge. A velocity magnitude of the air flowing from the air inlet into contact with the evaporator unit can deviate less than 0.1 m/s from the average air velocity across the surface area of the evaporator.