Record acquisition

Biodata Systems Structure Records Acquisition Search Strategies and Examples Chemical Data... 

Records Acquisition. Records may be sent to Biodata from any Merck laboratory site or outside Investigator. These may be In the form of (1) copies of laboratory notebook records (the most common), (2) punched cards from systems not compatible with... 

The status bar displays information about the current status of the acquisition system the position of each of the four axes of the probe position monitor the maximum amplitude of the signal within the gate for both the coupling channel and the signal (flaw detection) channel and the current operating mode of the system, which may be record-... 

The averaging time of the rapid-response record [Fig. 4-1 (a)] is an inherent characteristic of the instrument and the data acquisition system. It can become almost an instantaneous record of concentration at the receptor. However, in most cases this is not desirable, because such an instantaneous record cannot be put to any practical air pollution control use. What such a record reveals is something of the turbulent structure of the atmosphere, and thus it has some utility in meteorological research. In communications... 

Using the best procedures during data acquisition produces spectra with the maximum available information content. Once spectra are recorded that contain the information that is sought using the best procedures for extracting the information from the data is important to maximize the value of the analysis. This section will consider the procedures for data acquisition and the extraction of various types of information available from the data. 

To date, the usual way of recording the LEED pattern is a light-sensitive video camera with a suitable image-processing system. In older systems movable Earaday cups (EC) were used which detected the electron current directly. Because of long data acquisition times and the problems of transferring motion into UHV, these systems are mostly out of use nowadays. 

Prepare a reliability data acquisition plan for your or a hypothetical plant. Detail the sources of information, method of recording, analysis methods, and interfaces with management, maintenance, and operations. 

Desbrandes, R., Status report MWD technology. Part 1 Data acquisition and downhole recording and processing, Petroleum Engineering International, September 1988. 

Most of the vibration-based predictive maintenance systems include the capability of recording visual observations as part of the routine data acquisition process. Since the incremental costs of these visual observations are small, this technique should be incorporated in all predictive maintenance programs. 

Finally, the recording of many signals from the output of the analytic and electrochemical instrumentation requires a reliable multi-pen recorder or an equivalent recording system based on a data acquisition card and appropriate software. The recorded signals are normally in the range of a few mV to 10V. The use of reliable temperature controllers and thermocouples is also crucial for the success of the experiments. A lot of suppliers of such equipment can be easily found and will not be reported here. 

Extensive experiments were in fact needed before optimal test and acquisition conditions were eventually set (for details, see ). In any fixed strain and frequency conditions, data acquisition is made in order to record 10,240 points at the rate of 512 pt/s. Twenty cycles are consequently recorded at each strain step, with the immediate requirement that the instrument is set in order to apply a sufficient number of cycles (for instance, 40 cycles at 1.0 Hz, 20 cycles at 0.5 Hz the stability condition with the RPA) for the steady harmonic regime to be reached. Data acquisition is activated as the set strain is reached and stable. 

Data acquisition is not treated in this book. The most common technique is to convert a physicochemical signal into a voltage by means of a sensor, and feed the electrical signal into a digital volt meter or a chart recorder. With today s instrumentation this is no longer the problem it used to be. 

The INEPT experiment can be modified to allow the antiphase magnetization to be precessed for a further time period so that it comes into phase before data acquisition. The pulse sequence for the refocused INEPT experiment (Pegg et al., 1981b) is shown in Fig. 2.13. Another delay, A. is introduced and 180° pulses applied at the center of this delay simultaneously to both the H and the C nuclei. Decoupling during data acquisition allows the carbons to be recorded as singlets. The value of Z), is adjusted to enable the desired type of carbon atoms to be recorded. Thus, with D, set at V4J, the CH carbons are recorded at VsJ, the CH2 carbons are recorded and at VeJ, all protonated carbons are recorded. With D3 at %J, the CH and CH ( carbons appear out of phase from the CH2 carbons. 

The DEPT experiment (Doddrell elal, 1982) involves a similar polarization transfer as the INEPT experiment, except it has the advantage that all the C signals are in phase at the start of acquisition so there is no need for an extra refocusing delay as in the refocused INEPT experiment. Coupled DEPT spectra, if recorded, would therefore retain the familiar phasing and multiplet structures (1 1 for doublets, 1 2 1 for triplets, etc.). Moreover, DEPT experiments do not require as accurate a setting of delays between pulses as do INEPT experiments. 

A number of parameters have to be chosen when recording 2D NMR spectra (a) the pulse sequence to be used, which depends on the experiment required to be conducted, (b) the pulse lengths and the delays in the pulse sequence, (c) the spectral widths SW, and SW2 to be used for Fj and Fi, (d) the number of data points or time increments that define t, and t-i, (e) the number of transients for each value of t, (f) the relaxation delay between each set of pulses that allows an equilibrium state to be reached, and (g) the number of preparatory dummy transients (DS) per FID required for the establishment of the steady state for each FID. Table 3.1 summarizes some important acquisition parameters for 2D NMR experiments. 

Phase-sensitive data acquisition NMR data are acquired in this manner so that peaks are recorded with pure absorption-mode or pure dispersionmode line shapes. 

---