摘要:
System flow path designs that minimize the impact of gas diffusion sources and sinks. By reducing the magnitude of parasitic sources and sinks, lower rates of photosynthesis and transpiration can be more accurately measured, e.g., without the need for extensive empirical compensation. The gas exchange analysis system includes a sample chamber having an inlet and an outlet, wherein the internal surface(s) of the chamber defining the measurement volume are metal plated. The system also typically includes a source of gas coupled with the inlet of the sample chamber, and a gas analyzer coupled with the outlet of the sample chamber and configured to measure a concentration of one or more gases exiting the chamber, whereby the metal plated internal surface(s) of the chamber reduces sorption of the one or more gases within the chamber.
摘要:
System flow path designs that minimize the impact of gas diffusion sources and sinks. By reducing the magnitude of parasitic sources and sinks, lower rates of photosynthesis and transpiration can be more accurately measured, e.g., without the need for extensive empirical compensation. According to one aspect, a gas exchange analysis system includes a sample chamber defining a measurement volume for analysis of a sample, the sample chamber having an inlet and an outlet, wherein the internal surface(s) of the chamber defining the measurement volume are metal plated. The system also typically includes a source of gas coupled with the inlet of the sample chamber, and a gas analyzer coupled with the outlet of the sample chamber and configured to measure a concentration of one or more gases exiting the chamber, whereby the metal plated internal surface(s) of the chamber reduces sorption of the one or more gases within the chamber. The low thermal conductivity of the chamber substrate material provides an energy efficient means of sample temperature control. The low density of the chamber substrate material reduces chamber weight for improved portability and ergonomics.”
摘要:
System flow path designs that minimize the impact of gas diffusion sources and sinks. By reducing the magnitude of parasitic sources and sinks, lower rates of photosynthesis and transpiration can be more accurately measured, e.g., without the need for extensive empirical compensation. According to one aspect, a sensor head for use in a gas exchange analysis system includes a sample chamber defining a measurement volume for analysis of a sample, the sample chamber having an inlet and an outlet, and a flow splitting mechanism located proximal to the sample chamber, the mechanism configured to split a gas flow received at an input port from a remote source to a first output port and to a second output port, wherein the first output port is coupled with the inlet of the sample chamber. The sensor head also typically includes a first gas analyzer coupled with the outlet of the sample chamber and configured to measure a concentration of one or more gases, and a second gas analyzer coupled with the second output port of the flow splitting mechanism and configured to measure a concentration of the one or more gases. Advantageously, gas diffusion sources and sinks are reduced due to the proximity of the flow splitting mechanism with the sample chamber and gas analyzers. This advantageously reduces measurement error associated with or attributable to gas diffusion sources and sinks. The proximity advantage derives from minimizing the joints, gaskets, fittings, tubing lengths, and materials all prone or susceptible to gas diffusion.
摘要:
System flow path designs that minimize the impact of gas diffusion sources and sinks. By reducing the magnitude of parasitic sources and sinks, lower rates of photosynthesis and transpiration can be more accurately measured, e.g., without the need for extensive empirical compensation. According to one aspect, a sensor head for use in a gas exchange analysis system includes a sample chamber defining a measurement volume for analysis of a sample, the sample chamber having an inlet and an outlet, and a flow splitting mechanism located proximal to the sample chamber, the mechanism configured to split a gas flow received at an input port from a remote source to a first output port and to a second output port, wherein the first output port is coupled with the inlet of the sample chamber. The sensor head also typically includes a first gas analyzer coupled with the outlet of the sample chamber and configured to measure a concentration of one or more gases, and a second gas analyzer coupled with the second output port of the flow splitting mechanism and configured to measure a concentration of the one or more gases. Advantageously, gas diffusion sources and sinks are reduced due to the proximity of the flow splitting mechanism with the sample chamber and gas analyzers. This advantageously reduces measurement error associated with or attributable to gas diffusion sources and sinks. The proximity advantage derives from minimizing the joints, gaskets, fittings, tubing lengths, and materials all prone or susceptible to gas diffusion.
摘要:
Gaskets are provided for use in gas exchange measurement systems used for photosynthesis, respiration and transpiration measurements. Novel gaskets and gasket designs are provided, including composite gasket designs, along with corresponding construction techniques, which effectively provide low diffusion through bulk material, significant reductions in interfacial diffusion, sufficient compliance to conform to surface irregularities under low applied stresses, and/or low sorption properties, particularly of H2O vapor.
摘要:
Systems and methods for selecting a form for crediting a payee by a payment service provider include receiving a request to pay a payee on behalf of a payer. A form for crediting the payee is selected based on at least one of a comparison of a payer account number associated with the payer and the payee to a merchant account scheme associated with the payee or a comparison of a payment amount associated with the received request to a merchant credit limit associated with the payee. A payment is directed to the payee in accordance with the selected form for crediting.
摘要:
A safety system for a door-to-door jamb interface is provided. The safety interface uses several slidably joined members which are coupled to the door and its associated door jamb to prevent interaction between a user and the door-to-door jamb interface.
摘要:
A gas flux chamber assembly is provided that includes a lift-and-rotate mechanism and a chamber. The chamber is moved between first and second positions, wherein the chamber is positioned over a sample in the first position and is positioned outside of an area above the sample in the second position. In operation, the chamber is first lifted off of the collar and is then rotated, about a rotational axis outside of the area above the collar. These acts are reversed to move the chamber from the second position to the first position.
摘要:
To electronically present and pay bills, bill information representing a plurality of bills of a plurality of billers for a plurality of payors is transmitted to the plurality of payors. The transmitted bill information includes first information representing a first of the plurality of bills of a first of the plurality of billers for a first of the plurality of payors. A payment instruction from the first payor to pay the first bill, based on the transmitted first information, is received. A risk associated with payment of the first bill is determined and a debit type is selected based upon the determined risk. A payment of the first bill to the first biller is initiated based on the received payment instruction and to the selected debit type.