Agilent Technologies

About: Agilent Technologies is a company organization based out in Santa Clara, California, United States. It is known for research contribution in the topics: Signal & Mass spectrometry. The organization has 7398 authors who have published 11518 publications receiving 262410 citations. The organization is also known as: Agilent Technologies, Inc..

Accurate determination of S in organic matrices using isotope dilution ICP-MS/MS

Abstract: Accurate determination of low levels of S in organic matrices by means of isotope dilution ICP-single quadrupole MS (eg, for quantification of S components in reverse phase HPLC-ICP-MS experiments) is often not feasible This work describes an accurate, sensitive and fast analytical method for the determination of S in organic matrices by means of a recently developed ‘triple quadrupole’ ICP-MS instrument, operated in MS/MS mode The added value of the MS/MS approach for this application has been clearly visualised by varying the width of the bandpass of the first quadrupole analyzer from “fully open” (standard mode) down to single mass width (MS/MS mode) As a proof-of-concept, a biodiesel reference material has been analysed for its S content with the proposed method, using isotope dilution for calibration, and the results obtained were in excellent agreement with the certified value (within experimental uncertainty)

Optimisation of laser parameters for the analysis of sulphur isotopes in sulphide minerals by laser ablation ICP-MS

Abstract: The effects of laser type (Nd:YAG and excimer lasers) and their analytical parameters on 34S/32S isotopic fractionation during LA-ICP-MS analysis were investigated. Laser fluence has a larger fractionation effect when ablating pyrite with the New Wave Nd:YAG 193 nm laser, compared to the Resonetics 193 nm excimer laser which did not produce significant fractionation over the same range of fluence (1.3–3.7 J cm−2). Matrix effects occurred between pyrite and bornite on both laser systems, especially at low fluence. However, matrix effects can be reduced with increasing fluence lessening the need for matrix matched reference materials. The effects of interface tubing configuration were also investigated and the addition of a ‘squid’ mixing device, a coil of small diameter Tygon tubing and a small volume glass bulb, was found to improve signal precision and reproducibility and decrease the washout time of the S signal between analyses. The degassing of air from the inner surfaces of the interface tubing can produce significant isotopic drift (8‰ h−1), hence flushing the tubing prior to analyses is crucial for reproducible analyses. The isotopic composition and homogeneity of a range of sulphide minerals were characterised for use as potential reference materials. We present preliminary data for a large, isotopically homogeneous pyrite crystal (PPP-1) which could be considered as a new isotopic reference material (δ34SV-CDT = 5.3 ± 0.2‰).

System and method for specifying trigger conditions of a signal measurement system using graphical elements on a graphical user interface

Abstract: A system is disclosed for enabling a user to specify one or more trigger conditions by graphically creating a pictorial representation of the trigger conditions. The pictorial representation is presented on a display window of a graphical user interface of a logic analyzer and is accomplished using trigger-condition icons. Each icon represents a trigger condition of a signal or bus. The user specifies the trigger conditions by positioning the trigger-condition icons on the display window. The user does this by selecting, dragging, and dropping the trigger-condition icons onto the display window. The display window may include one or more name elements, each associated with a signal or a bus. The user may specify the trigger condition of a first signal or bus by selecting a trigger-condition icon and positioning it at a first position on the display window in horizontal alignment with the name element of the first signal or bus. Responsive to this action, the system displays a first trigger-condition element at the first position. The user may select the trigger-condition icon from a group of icons consisting of rising-edge icon, falling-edge icon, either-edge icon, low-level icon, high-level icon, don't care icon, bus icon, positive pulse icon, and negative pulse icon. The display window may include one or more vertically aligned constant time lines. The first position may be located on a first constant-time line, and the user may select other position on other constant-time lines. The user may specify a time-limit between the first and second constant-time lines, and or between the second and third constant-time lines. This specification may be that the time-limit is an indefinite time period, or that it is less than or greater than a user-specified time period. The system includes a trigger specifier that determines a combined trigger condition for a first state corresponding to the first constant-time line based on the first and second trigger-condition elements and one or more boolean expressions. These expressions may be predetermined, or they may be user-specified.

Acceleration models, constitutive equations, and reliability of lead-free solders and joints

Abstract: Abst ract A set of accclcration niodels for lead-frec solder joints is proposed and discussed in this shidy. Useful equations for the acceleration models, life distribution. and failure m e are also provided. Furthennorc, methods for selecting the acceleration factor are discussed. In addition. non-lincar 3D creep analyscs of the 256-pin plastic ball grid array PCB (printed circuit board) assembly are presented. The solder joints are made of 95.5wt%Sn-j .9wt%Ag-O.~~~tY~u lead-free soldcr. The leadfree results will be coinparcd to those with Sn-Pb solder joints.