Systems and methods for analyzing a diffusion trend of a diffusible substance. The systems may obtain a plurality of sets of reference information relating to the diffusible substance from a plurality of devices respectively, each of the plurality of sets of reference information at least including a time point when a corresponding device detects the diffusible substance and a location where the device detects the diffusible substance. The plurality of sets of reference information may correspond to a same or a substantially same time domain. The systems may determine the diffusion trend of the diffusible substance based on the plurality of sets reference information.

An air pollution forecast management system including an air quality management device and an Internet of Things (IOT) cloud platform is disclosed. The air quality management device includes a dust particle sensing module being configured to sense gas exhausted from a smoke exhaust flue. The IoT cloud platform is configured to compute, at a second time after a first time, an exhaust gas set of the gas drifting from the first time to the second time by using current-observed meteorological data at the second time, receive a plurality of air-pollution sets at a plurality of geographic locations at the second time, compute a plurality of influencing results of the plurality of air-pollution sets respectively associated with the exhaust gas set, and generate a feedback instruction according to at least one of the plurality of influencing results to control gas emission of the smoke exhaust flue.

A gas detection device for detection of one or more gas analytes in an environment includes a housing including an inlet via which gas to be sampled from the environment enters the housing, a control system within the housing comprising a processor system and a memory system in communicative connection with the processor system, and one or more gas sensors within the housing in fluid connection with the inlet and in communicative connection with the control system. Each of the one or more gas sensors is independently responsive to one of the one or more gas analytes. The control system is configured to control flow rate of gas from the environment through an accessory device assembly including one or more accessory devices in fluid connection with the inlet on the basis of data for the accessory device assembly in fluid connection with the inlet.

A gas analysis device for analyzing a compound gas and H.sub.2O gas produced in a main reaction in which an aqueous solution including a compound and water is vaporized, includes a first concentration calculating unit that calculates a concentration of the compound gas, a second concentration calculating unit that calculates a concentration of the H.sub.2O gas, an analysis unit that compares a first actual concentration which is the concentration of the compound gas calculated by the first concentration calculating unit with a first ideal concentration which is the concentration of the compound gas in case that the main reaction proceeds ideally, and that compares a second actual concentration which is the concentration of the H.sub.2O gas calculated by the second concentration calculating unit with a second ideal concentration which is the concentration of the H.sub.2O gas in case that the main reaction proceeds ideally and an output unit.

A method of monitoring catalytic performance of a catalyst used in a reforming process, comprising a) collecting gaseous component data from the reforming process; b) calculating a gaseous component ratio from the gaseous component data; and c) utilizing the gaseous component ratio to estimate an amount of catalytic activity remaining in the catalyst used in the reforming process, a number of days on stream remaining for the catalyst used in the reforming process, or both.

Embodiments relate generally to systems and methods for providing a secure attachment between a gas detector and an external device. A gas detector may comprise a socket comprising a cable attachment configured to interface with an external device; and a holder configured to attach to the socket and to the external device, the holder comprising a first interface configured to attach to the socket of the gas detector; a second interface configured to attach to the external device; a first cable attachment located within the first interface, configured to attach to the gas detector; and a second cable attachment located within the second interface, configured to attach to the external device.

A pollution source detection system, includes an automated vehicle including a position sensor that detects a geographic position of the automated vehicle and at least one pollution detection sensor that measures a concentration of pollution at the automated vehicle. The pollution source detection system includes a back-end system. The back-end system includes a network interface that receives the geographic position and the concentration of the pollution from the automated vehicle. The back-end system includes a database that stores the geographic position and the concentration of the pollution received via the network interface. The back-end system includes a processor that measures a gradient of the concentration of the pollution and controls a movement of the automated vehicle based on the gradient to guide the automated vehicle toward a source of the pollution.

An information processing apparatus (2000) acquires time-series data (14) output by a sensor (10) and computes a plurality of feature constants ?.sub.i and a contribution value ?.sub.i representing contribution with respect to the time-series data (14) for each feature constant ?.sub.i. Thereafter, the information processing apparatus (2000) outputs information in which a set ? of the feature constants ?.sub.i and a set ? of the contribution values ?.sub.i are associated with each other as a feature value of a target gas. As the feature constant ?, a velocity constant ? or a time constant ? that is a reciprocal of the velocity constant can be adopted.

A converter module handles memory requests issued by a cache (e.g. an on-chip cache), where these memory requests include memory addresses defined within a virtual memory space. The converter module receives these requests, issues each request with a transaction identifier and uses that identifier to track the status of the memory request. The converter module sends requests for address translation to a memory management unit and where there the translation is not available in the memory management unit receives further memory requests from the memory management unit. The memory requests are issued to a memory via a bus and the transaction identifier for a request is freed once the response has been received from the memory. When issuing memory requests onto the bus, memory requests received from the memory management unit may be prioritized over those received from the cache.

A converter module is described which handles memory requests issued by a cache (e.g. an on-chip cache), where these memory requests include memory addresses defined within a virtual memory space. The converter module receives these requests, issues each request with a transaction identifier and uses that identifier to track the status of the memory request. The converter module sends requests for address translation to a memory management unit and where there the translation is not available in the memory management unit receives further memory requests from the memory management unit. The memory requests are issued to a memory via a bus and the transaction identifier for a request is freed once the response has been received from the memory. When issuing memory requests onto the bus, memory requests received from the memory management unit may be prioritized over those received from the cache.