定价： 116元

The IEEE-2430 standard specifies the set of definitions, rules and steps for applying the IFPUG (International Function Point Users Group) nonfunctional size measurement method SNAP (Software Non-functional Assessment Process) and provides guideline and examples of how to use the size measurements in software projects.

定价： 93元 / 折扣价： 80 元

This recommended practice covers the sizing of nickel-cadmium batteries used for standby operation in stationary applications. Recommendations are provided for applications including, but not limited to, generating stations, substations, telecommunications, switchgear and control systems, compressor stations, emergency lighting, and uninterruptible power supplies. Guidance is provided for sizing for engine-starting applications. The following topics are beyond the scope of this document: Installation, maintenance, qualification, and testing procedures; Consideration of battery types other than nickel-cadmium; Renewable energy systems (e.g., wind turbines and photovoltaic systems) that may provide only partial or intermittent charging; Design of the dc system and sizing of the battery charger(s)

定价： 81元 / 折扣价： 69 元

This recommended practice provides a procedure to size a stand-alone photovoltaic (PV) system. Systems considered in this document consist of PV as the only power source and a battery for energy storage. These systems also commonly employ controls to protect the battery from being over- or undercharged and may employ a power conversion subsystem (inverter or converter). The issues of array utilization, battery-charge efficiency, and system losses are also considered in terms of their effect on… read more system sizing. This recommended practice is applicable to all stand-alone PV systems where PV is the only charging source. This document does not include PV hybrid2 systems or grid-connected systems. This document is normally intended to be used in conjunction with IEEE Std 1013 when the solar/PV array is paired with a lead-acid battery systems.3 This recommended practice does not include the sizing of the system controller, inverter, wiring, or other system components. read less

定价： 59元 / 折扣价： 51 元

Methods are described for defining the dc load and for sizing a lead-acid battery to supply that load for stationary battery applications in float service. Some factors relating to cell selection are provided for consideration. Installation, maintenance, qualification, testing procedures, and consideration of battery types other than lead acid are beyond the scope of this recommended practice. The design of the dc system and sizing of the battery charger(s) are also beyond the scope of this recommended practice.

定价： 84元 / 折扣价： 72 元

This recommended practice describes methods for sizing nickel/cadmium batteries used with terrestrial photovoltaic (PV) systems. Installation, maintenance, safety, testing procedures, and consideration of battery types other than nickel/cadmium are beyond the scope of this document. Recommended practices for the remainder of the electric systems associated with PV installations are also beyond the scope of this document.

定价： 146元 / 折扣价： 125 元

This recommended practice describes methods for defining the dc load in a generating station or a substation and for sizing a lead storage battery to supply that load. Some factors relating to cell selection are provided for consideration. Installation, maintenance, qualification, testing procedures, and consideration of battery types other than lead storage are beyond the scope of this recommended practice. Design of the dc system and sizing of the battery charger(s) are also beyond the scope… read more of this recommended practice. read less

定价： 55元 / 折扣价： 47 元

定价： 144元

This standard defines a method for the sizing of non-functional software requirements. It complements ISO/IEC 20926:2009, which defines a method for the sizing of functional user requirements (FUR). This standard also describes the complementarity of functional and non-functional sizes, so that sizing both functional and non-functional requirements (NFR) do not overlap. It also describes how non-functional size, together with functional size, should be used for measuring the performance of… read more software projects, setting benchmarks, and estimating the cost and duration of software projects. In general, there are many types of non-functional software requirements. Moreover, non-functional aspects evolve over time and may include additional aspects in the as technology advances. This standard does not intend to define the type of NFR for a given context. Users may choose ISO 25010:2011 or any other standard for the definition of NFR. It is assumed that users will size the NFR based on the definitions they use. This standard covers a subset of non-functional types. It is expected that, with time, the state of the art can improve and that potential future versions of this standard can define an extended coverage. The ultimate goal is a version that, together with ISO/IEC 20926:2009, covers every aspect that may be required of any prospective piece of software, including aspects such as process and project directives that are hard or impossible to trace to the software's algorithm or data. The combination of functional and non-functional size would then correspond to the total size necessary to bring the software into existence. Calculating the effort and duration of the implementation of the NFR is outside the scope of this standard. read less

定价： 106元 / 折扣价： 91 元

This recommended practice covers the sizing of nickel-cadmium batteries used for standby operation in stationary applications. Recommendations are provided for applications including, but not limited to, generating stations, substations, telecommunications, switchgear and control systems, compressor stations, emergency lighting, and uninterruptible power supplies. The following topics are beyond the scope of this document: Installation, maintenance, qualification, and testing procedures; Sizing… read more guidance for engine starting applications; Consideration of battery types other than nickel-cadmium; Renewable energy systems (e.g., wind turbines and photovoltaic systems) that may provide only partial or intermittent charging; Design of the dc system and sizing of the battery charger(s) read less

定价： 58元 / 折扣价： 50 元

This guide provides information to assist in sizing the array and battery of a stand-alone photovoltaic system. Systems considered in this guide consist of PV as the only power source and a battery for energy storage. These systems also commonly employ controls to protect the battery from being over- or undercharged, and may employ a power conversion subsystem (inverter or converter). This guide is applicable to all stand-alone PV systems where PV is the only charging source. This guide does… read more not include PV hybrid systems nor grid-connected systems. This guide covers lead-acid batteries only; nickel-cadmium and other battery types are not included. This guide does not include the sizing of the system controller, inverter, wiring, or other system components. read less

定价： 0元 / 折扣价： 0 元

定价： 191元

定价： 319元

This recommended practice describes methods for electrical sizing of nickel-cadmium batteries for application on rail passenger vehicles used for battery back-up of low voltage dc auxiliary power systems. It encompasses various factors that govern the electrical size of the battery including but not limited to number of cells, rated capacity, maximum system voltage, minimum system voltage, correction factors, and margins. It does not describe methods for defining the dc load profile nor address… read more the physical sizing, installation or maintenance of the batteries. Nor does it apply to batteries used for motive power or starting internal combustion engines. Design of the low voltage dc system and sizing of the low voltage power supply and battery charger(s), and consideration of battery types other than nickel-cadmium batteries are also beyond the scope of this recommended practice. read less

定价： 102元 / 折扣价： 87 元

This document defines a method for measuring the non-functional size of the software. It complements ISO/IEC 20926:2009, which defines a method for measuring the functional size of the software. This document also describes the complementarity of functional and non-functional sizes, so that deriving the sizes from the functional and the non-functional requirements does not result in duplication in the distinct functional and non-functional sizes. In general, there are many types of non-… read more functional requirements. Moreover, non-functional requirements and their classification evolve over time as the technology advances. This document does not intend to define the type of NFR for a given context. Users can choose ISO 25010 or any other standard for the definition of NFR. It is assumed that users size the NFR based on the definitions they use. This document covers a subset of non-functional requirements. It is expected that, with time, the state of the art can improve and that potential future versions of this document can define an extended coverage. The ultimate goal is a version that, together with ISO/IEC 20926:2009, covers every aspect that can be required of any prospective piece of software, including aspects such as process and project directives that are hard or impossible to trace to the software's algorithm or data. The combination of functional and non-functional sizes would then correspond to the total size necessary to bring the software into existence. Estimating the cost, effort and duration of the implementation of the NFR is outside the scope of this document. read less

定价： 102元 / 折扣价： 87 元