2026年10月16日

LDL-C Calculator (Friedewald) Field Guide: When Three Equations Decide Whether a Calculated LDL Tells the Truth

By xiezixing 2026年10月16日

Friedewald 1972 is fast and transparent but unreliable when TG >= 400 mg/dL. The Martin/Hopkins and Sampson-NIH estimators catch the bias. Compare all three on one panel with the Elysia Tools LDL-C Calculator.

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Mean Platelet Volume Is a Hypothesis, Not a Threshold: Reading the MPV/Platelet Count Pairing Matrix

By xiezixing 2026年10月16日

Reading Mean Platelet Volume in fL as a hypothesis about marrow production kinetics. The MPV/platelet-count pairing splits ITP from reactive thrombocytosis before any reflex test runs.

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Mean Platelet Volume Is a Hypothesis, Not a Threshold: Reading the MPV/Platelet Count Pairing Matrix

By xiezixing 2026年10月16日

Reading Mean Platelet Volume in fL as a hypothesis about marrow production kinetics. The MPV/platelet-count pairing splits ITP from reactive thrombocytosis before any reflex test runs.

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NB-IoT & LTE-M Cellular IoT Packet Analyzer Field Guide: When Six Payload Decoders Cannot Disagree on Which Byte Holds the Method Token

By xiezixing 2026年10月16日

How a single hex paste walks six wire formats (CoAP, LwM2M, SMS-DELIVER, RFC 6690, block-wise CoAP, DTLS) without offset drift when the first byte picks the decoder branch.

Heat Exchanger ε-NTU Calculator Field Guide: When Four Arrangement Curves Fan Out at Low C*

By xiezixing 2026年10月16日

The four ε-NTU curves look almost identical on a textbook plot and behave like four…

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ESA PB05-Style Brouwer-Lyddane Averaged-Element Orbit Propagator: When Three Perturbation Layers Decide GNSS Drift

By xiezixing 2026年10月16日

An averaged-element propagator isn’t an approximation — it’s the only model that stays accurate for…