orthohydrogen[,?:θ?'haidr?d??n]正氢
1.Interatomic Distances of Molecule for Orthohydrogen and Parahydrogen;正氢和仲氢分子的核间距
2.By using light scattering technique, the transition of rotating energy levels from hydrogen molecular occurs and produced rotating Raman bands for orthohydrogen and parahydrogen are at 587.采用光散射技术，促使氢分子产生转动跃迁，得到正氢和仲氢的转动拉曼光谱，其峰位为５８７。
3)hydrogen injection timing喷氢正时
1.The injection control strategy was put forward after analyzing the influence of hydrogen injection timing and hydrogen injection quantity on the working performance of hydrogen-fueled engine.在分析喷氢正时和喷氢量对氢发动机工作性能影响的基础上,提出了根据发动机运行工况实时调节和修正喷氢参数的优化控制策略,并基于Pareto秩与决策偏好相结合的全自动标定算法,进行了喷氢提前角和喷氢脉宽电控系统的设计。
4)normal hydrogen正常氢
5)Borohydride cation硼氢正离子
6)n-butanal hydrogenation正丁醛加氢
延伸阅读
正氢分子式：CAS号：性质：在氢分子内两个氢原子核自旋方向相同。熔点259.07℃。沸点252.59℃。-73℃时比热容为1.51J/(kg·℃)。物理性质与仲氢略有差别。化学性质完全相同。正氢与仲氢可相互转变，但较缓慢。转变与温度有关，高温有利于转变为正氢。用液态空气冷却氢气，并用活性炭吸附分离得到，若在-253℃用活性炭吸附氢气，则仲氢为99.82％。在一般温度下正氢与仲氢比为3:1。
