There was no difference in pH value, standard bicarbonate radical and head wet/ dry ratio between the head injury groups and control group.

The degradation of trace nitrobenzene in water by UV/ H2O2 and UV/ TiO2/ H2O2 was compared, as well as the influences of bicarbonate ion and humic acid.

研究比较了UV／H2O2和UV／TiO2／H2O2对水中微量硝基苯的降解效果，并考察了水中常见HCO3-和腐殖酸对硝基苯降解的影响。

Objective To establish a stable single reagent enzymatic method for determination of serum bicarbonate ion.

目的建立一种稳定的单试剂酶法测定血清碳酸氢根（HCO3-）。

Single reagent enzymatic method for determination of serum bicarbonate ion

液体单试剂酶法测定血清碳酸氢根

A Color Development System for Bicarbonate Ion

一种碳酸氢根显色体系

Research on Oilwell Cement Corrosion by Chloride Ion and Bicarbonate Ion Versus

氯离子与碳酸氢根离子对油井水泥的腐蚀研究

Contamination of Drilling Fluid by Carbonate Ion and Bicarbonate Ion and Its Treatment

碳酸根和碳酸氢根离子对钻井液的污染及处理

Loose-fitting trousers, usually of strong fabric, with a bib front and shoulder straps, often worn over regular clothing as protection from dirt.

宽松的裤子，工装裤常由坚固织物制成的宽松的裤子，前有围裙的上部分，肩有背带；

Problems Related to Frequency Doubling of Biaxial Crystal Lithium Formate Monohydrate

双轴晶体一水甲酸锂倍频的若干问题

The Identification of Optic Sign of Biaxial Crystal at Optic Angle Near 90 °

光轴角近90°时二轴晶光性正负的判别

Theoretical and Experimental Study on the Interference of Convergent Polarized Light for a Biaxial Crystal

双轴晶体会聚偏光干涉的理论与实验研究

Realization of Biaxial Crystal Dynamic Outer Conic Refraction by Using Iris

利用可变光阑实现双轴晶体动态外锥折射

New methods for proving the existence of circle profile in biaxial crystal

证明双轴晶体圆切面存在的新方法

Plane wave solutions of biaxial crystal in principal axis coordinate system

双轴晶体中平面波解在主轴坐标系下的表达

New Calculation Method of the Optic Axial Angle of the Biaxial Crystal

双轴晶体光轴角计算的新方法

The general situation of production technique and tensile mechanism of biaxial orientation PVC-U tubing are introduced, and their characteristics are explained, which have certain instruction to realize their commercial application.

介绍了PVC-U双轴取向管材的生产技术概况和拉伸机理，对它们的特点进行了说明，对实现工业应用具有一定的指导作用。

Progress of recent studies on the deformation mechanism for spherulites of isotactic polypropylene ( I PP) in the uniaxial and biaxial orientation process was introduced.

介绍了近来国内外对单向、双向拉伸过程中全同立构聚丙烯（iPP）晶体内部球晶形变机理的研究进展。

Biaxial orientation polyethylene terephthalate ( BOPET) film is widely used in printing, packaging and so on for its excellent comprehensive properties.

双向拉伸聚酯（BOPET）薄膜是一种综合性能优异的薄膜材料，广泛应用于印刷、包装等领域。

Development of Pearl Masterbatch for Biaxial Orientation Polypropylene Films

白色双向拉伸聚丙烯薄膜专用珠光母料的研制

Effect factor on high-speed biaxial orientation for BOPP speciality resin

共聚BOPP专用料高速拉伸影响因素

In this review methods of determining polymer orientation using X-ray diffraction are described. It includes uniaxial and biaxial orientation, as well as their calculating methods.

介绍了用X射线衍射法测定结晶聚合物材料取向度定义，单轴和双轴取向及其计算方法。