filter过滤器

The acid neutralization cart shown below neutralizes up to 40 gallons of nitric or citric acid per day. The neutralization system monitors the pH level in the neutralization tank and automatically adds sodium hydroxide until the pH inside the cart reaches a preset level. The cart is on casters to allow for easy movement to process tanks.

filter发音

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JSfilter

In the ungrouped version, filter() compares the value of mass in each row to the global average (taken over the whole data set), keeping only the rows with mass greater than this global average. In contrast, the grouped version calculates the average mass separately for each gender group, and keeps rows with mass greater than the relevant within-gender average.

After passivation, part cleaning or other chemical processes, the passivation acid, alkaline cleaners, and other chemicals cannot be re-used but also cannot be disposed of until they are neutralized to a suitable pH level. This can be achieved using a neutralization tank or neutralization system.

The acid neutralization system uses soda ash, sodium hydroxide or similar to make an alkaline solution. When the alkaline solution is added to acid wastewater in the neutralization tank, it increases the pH in the acid neutralization tank. This facilitates disposal of used acids such as nitric acid for passivation.

The filter() function is used to subset a data frame, retaining all rows that satisfy your conditions. To be retained, the row must produce a value of TRUE for all conditions. Note that when a condition evaluates to NA the row will be dropped, unlike base subsetting with [.

This function is a generic, which means that packages can provide implementations (methods) for other classes. See the documentation of individual methods for extra arguments and differences in behaviour.

filter函数

Expressions that return a logical value, and are defined in terms of the variables in .data. If multiple expressions are included, they are combined with the & operator. Only rows for which all conditions evaluate to TRUE are kept.

filter滤镜

The chemical or acid neutralization tank from Best Technology automatically adds neutralization solution to facilitate disposal of industrial wastewater. The automated chemical neutralization system takes the guesswork out of determining the correct amount of base or acid to add to industrial wastewater to neutralize it for disposal.

The filter() function is used to subset the rows of .data, applying the expressions in ... to the column values to determine which rows should be retained. It can be applied to both grouped and ungrouped data (see group_by() and ungroup()). However, dplyr is not yet smart enough to optimise the filtering operation on grouped datasets that do not need grouped calculations. For this reason, filtering is often considerably faster on ungrouped data.

filters中文

To learn more about adding an acid neutralization tank or neutralization system to your manufacturing workflow, contact an applications engineer at Best Technology today.

filter词典

Relevant when the .data input is grouped. If .preserve = FALSE (the default), the grouping structure is recalculated based on the resulting data, otherwise the grouping is kept as is.

Optionally, a selection of columns to group by for just this operation, functioning as an alternative to group_by(). For details and examples, see ?dplyr_by.

A data frame, data frame extension (e.g. a tibble), or a lazy data frame (e.g. from dbplyr or dtplyr). See Methods, below, for more details.

filter用法

A pump on the neutralization cart transfers used fluid for neutralization to the cart storage tank. A metering pump measures a predetermined amount of neutralization solution from a separate container connected to the cart, and then adds it to the neutralization tank. The solution is constantly circulated and monitored via pH monitor. The metering pump continues adding neutralization solution until the pH is within a preset range.

Requirements vary by chemistry and municipality, but commonly a pH between 6 and 10 is acceptable for disposal into facility drains and sewer, assuming there are no hazardous wastes within the used chemistry.

Because filtering expressions are computed within groups, they may yield different results on grouped tibbles. This will be the case as soon as an aggregating, lagging, or ranking function is involved. Compare this ungrouped filtering:

The portable chemical neutralization system or neutralization tank allows for no-touch neutralization and easier disposal into facility wastewater treatment or municipal sewer systems.

The alkaline neutralization system in a neutralization tank uses phosphoric acid or similar acid solution to decrease the pH of alkaline wastewater. The neutralization tank facilitates disposal of used alkaline solutions such as alkaline cleaners used for parts cleaning.