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1 Primary & Middle School Mathematics1–9 年级在线 2 High School Mathematics10–12 年级在线 3 University Mathematics — Year 1本科一年级在线 4 University Mathematics — Year 2本科二年级在线 5 University Mathematics — Year 3本科三年级在线

1 Primary & Middle School Physics1–9 年级在线 2 High School Physics10–12 年级在线 3 University Physics — Year 1本科一年级在线 4 University Physics — Year 2本科二年级在线 5 University Physics — Year 3本科三年级在线

1 School Chemistry — Grades 1 to 121–12 年级在线 2 University Chemistry — Year 1本科一年级在线 3 University Chemistry — Year 2本科二年级在线 4 University Chemistry — Year 3本科三年级在线

1 Primary & Middle School Biology1–9 年级在线 2 High School Biology10–12 年级在线 3 University Biology — Year 1本科一年级在线 4 University Biology — Year 2本科二年级在线 5 University Biology — Year 3本科三年级在线

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1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Biology · 术语表

什么是 Energy expenditure？

Definition 7.1 High School Biology · 第 7 章 — Exercise and the Body’s Energy Needs

The energy expenditure of the body, in joules, is the total energy its cells release from organic molecules over a given time. Divided by the time, it is a metabolic power, in watts. At rest an adult spends about $80\,\mathrm{W}$ — some $7000\,\mathrm{kJ}$ a day — to keep the heart beating, the brain working, the temperature at $37\,{}^{\circ}\mathrm{C}$ and the cells alive; this is the basal metabolism. Every activity adds to it.

示例

Example 7.3 (Daily budgets)

A student sitting in class, walking to school and sleeping spends about $9000\,\mathrm{kJ}$ a day; an hour of football adds some $2500\,\mathrm{kJ}$ ; a day in the mountains with a pack, $15\,000\,\mathrm{kJ}$ in all. A cyclist on a mountain stage of a race spends $25\,000\,\mathrm{kJ}$ , and cannot eat enough during the day to cover it. The energy comes from food (Chapter 1): $17\,\mathrm{kJ}$ per gram of carbohydrate or protein, $38\,\mathrm{kJ}$ per gram of lipid.

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