Provided are synthetic dendrimer calibrants for mass spectrometry. The calibrants are distinguished by their relative ease and rapidity of synthesis, comparatively low cost, long shelf life, high purity, and amenability to batch synthesis as mixtures. The latter characteristic enables parallel preparation of higher molecular weight compounds displaying useful distributions of discrete molecular weights, thereby providing multi-point mass spectrometry calibration standards. Methods of making, tuning and using said calibrants are provided.

A residual analyzer assembly including an analyzer probe (12), typically of the amperometric type, and a working fluid sampler system (14) having means for backflushing the flow so as to periodically cleanse the system. The residual analyzer probe having two bare electrodes operating as a working electrode (124) and a counter electrode (126). The working electrode being formed in a double spiral helix with the counter electrode being formed in an outer peripheral ring closely adjacent the working electrode. The probe also including a third electrode (132) within an electrolytic solution and positioned behind a membrane (128) located directly behind the working electrode.

The invention relates to a grille for deflecting airflows and/or for partially protecting devices from direct view. The grille is comprised of a one-piece blank (10), in which are made bending lines (11, 12) and partition lines (13) in such a way that the blank (10) can be bent into its mounting form in which it comprises lateral surfaces (2) and a front surface (5), which forms, by means of the partition lines (13) and the bending lines (11, 12), louvres (4) which are in an slanting position with respect to the plane of the front surface, each louvre (4) remaining fixed to the blank (10) at both ends.

The drilling boom (500) of the drilling rig according to the invention has a first end (512) and a second end (509), and the second end is during use of the drilling rig toward the drilling direction, a slide (514), which is moveable along the drilling boom, which slide has a rotation unit (508) and catch jaws and at least two power means (502, 511) for moving the slide. The power means are attached to the slide either directly or by means of a transmission mechanism. A pipe line set by the drilling pipe and straight lines set by the power means are substantially at the same plane. The pipe line is between the straight lines set by the power means, dividing the level into a first part and a second part, and the intrinsic values of the moment M1 caused by the power means in the first part and the moment M2 caused by the power means in the second part are substantially of the same magnitude. The plane tilts towards the direction of the drilling rig, where the drilling pipe is handled. The straight lines set by the power means set a plane, and the pipe line is at this plane or placed so in relation to this plane that the moments caused by the power means behave in the above-described way. The power means can be hydraulic cylinders, wherein the parts are arranged to move so that the total length of the power means changes.

An alkaline, rechargeable electrochemical cell includes a pasted electrode structure in which a composition comprising a paste matrix component includes cobalt in an amount greater than 6 weight percent ranging up to 14 weight percent. The matrix may also include a rare earth such as yttrium. The composition further includes particles of nickel hydroxide dispersed in the matrix, and these particles include cobalt levels ranging from greater than 8 atomic percent up to 15 atomic percent. Cells incorporating these materials have good charging efficiency at elevated temperatures.