Rice field ecosystems in northern China ⅱ. Study of symbiotic nitrogen fixation of Azolla in rice-Azolla combination systems 北方稻田生态系统研究Ⅱ.稻萍结合系统细绿萍共生固N量研究
The author summarized the biomechanical studies in the field of rigid internal fixation of fractures in oral and maxillofacial region. 作者就颌面部骨折及坚强内固定的生物力学研究作一综述。
In the basic theory part, it gives a boundary between the concept, scope and the character of the employer's liability in the field of carriage by sea, affirms the strict liability is the doctrine of liability fixation of employer's liability. 在基础理论部分,对海上运输中雇主责任的概念、范围、性质进行了界定,确认了无过错责任是海上运输中雇主责任的归责原则;
Field experiments were conducted to study the intensity of soil nitrogen fixation ( ISNF) of the artificial meadow ( alfalfa) on saline lands of the inland and seashore at WuDi, Shan Dong; 在山东无棣、天津大港、河北沧州滨海和内陆盐碱地设置田间试验,研究了人工草地(紫花苜蓿)生态系统土壤固氮作用强度。
Conclusion: The field of fixation through lens has changes than that of the unaided eye. 结论:矫正眼的注视野较裸眼有变化。
A new fixation method, based on magnetic field and friction-clamping, was presented for countering the low reliability, stability and machining precision of the current fixation technique of paper honeycomb. 为了解决当前纸基蜂窝零件高速铣削加工夹持方法的可靠性和稳定性较差以及加工精度低的缺点,提出一种基于磁场和摩擦吸附原理的夹持方法。
Clinical study of the field of binocular fixation in strabismus before and after surgery 斜视手术前后双眼单视注视野的临床研究
Highly efficient engineering Frankia strains and new symbiotic nitrogen-fixing system obtained by the approaches and technologies of biological engineering will be the most important objectives in the field of biological nitrogen fixation in the future. 利用生物工程技术和方法构建高效的Frankia工程菌和新的固氮共生体系将成为今后生物固氮研究领域中的发展方向和追求目标。