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Discover Ludwig"negative elevation" is not a phrase that is used in written English
It does not mean anything in the context of writing. If you are looking for a phrase to use in writing, you could try "downward trend" instead. For example, "Sales of the product have experienced a downward trend over the past few weeks."
Exact(5)
The zenith-looking antenna at a geodetic reference receiver station captures both direct and reflected GPS signals, although the reflected signals are received at a negative elevation angle where the antenna radiation gain is non-zero.
ϕ a is the interference angle introduced by the possible different phase patterns for the direct incident wave with a positive elevation angle and the reflected wave with a negative elevation angle.
Also, the RHCP gain for a reflective wave incoming from a negative elevation angle is much smaller than the gain for an incoming direct wave from a positive elevation angle.
We investigated the physiological consequences of one of the most extreme exercises realized by humans in race conditions: a 166-km moultra-marathonarathon (MUM) with 9500 m of positive and negative elevation change.
The findings of the present study suggest that extremely long eccentric exercise (total negative elevation was higher than going from the top of Mount Everest to sea level in less than two days) at low intensity may be sufficient to trigger LFF, as is the case for much shorter distance but higher intensity (combination of negative slope and speed) downhill running [24].
Similar(54)
At admission electrocardiogram (ECG) showed ST segment elevation, negative T waves and troponin was elevated suggesting ST segment elevation myocardial infarction (STEMI).
Foliar δ(13)C became less negative with increasing elevation on the wet east-side lava flows, but not the dry northwest-side flows; it did not reflect patterns of precipitation or presumed water availability.
Assuming a horizontal incident airflow moving relative to the wing at a speed of v = 8 m/s, deviation of the airstream around the wing reached a maximum value of about 2.8 cm at a flapping angle of 20° (Fig. 6a,b), the maximal amount of depression considered in this part of the analysis (note that positive angles represent depression, while negative ones represent elevation).
For the North Island stands, partial correlations adjusted for stand age showed weak but statistically significant relationships between wood density and elevation (negative), and MAT (positive).
This is likely due to the dynamic nature and increasing contribution of the proximal ring, where deposition can result in negative changes in elevation (thickness) but a volume increase through deposition on the slopes of the proximal ring.
Consequently, the negative correlation of elevation relative to the road, and temperature, reflects the expected negative correlation between altitude and mean annual temperature (R = 0.946).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com