How were paper birch and Douglas fir communicating?

Birch of western United States resembling the paper birch but having brownish bark.

美国西部的一种桦树，类似于纸皮桦，但是树皮棕色。

The response of wood/ bark properties of red birch seedlings to elevated CO2 ( EC) under low ( LD) and high density ( HD) were investigated in closed top fumigation chambers ( CTC).

研究了高（HD）、低（LD）两个种植密度下红桦幼苗的树皮和去皮树干特征对CO2升高的响应。

The effects of elevated CO2 concentration on dry matter allocation and nutrient contents of red birch seedlings were studied under two planting densities in controlled environment chambers.

采用控制环境生长室研究了2个密度水平下CO2浓度升高对红桦幼苗干物质分配与营养的影响，并分析了红桦干物质分配与养分浓度的关系。

The results showed that red birch biomass was stimulated by CO2 enrichment, while the root to shoot ratio was not affected.

m-2两个密度水平。结果表明，升高CO2浓度可促进红桦幼苗生物量的增加，但对根冠比没有显著影响。

Response of dry matter allocation and nutrition of red birch ( Betula albosinensis) seedlings to elevated CO_2

红桦幼苗干物质分配与营养对CO2升高的响应

As a result, everyone from the John Birch Society to the Hells Angels may think we agree with them.

结果，每个来自约翰·伯奇协会的地狱天使们都可能认为我们在认同他们。

The induced eddy current in the iron core of iron style bipolar axial magnetic field vacuum interrupter is analyzed.

该文对铁芯式两极纵磁真空灭弧室中铁芯的涡流进行了数值分析。

Development and Study on iron core style bipolar axial magnetic field vacuum interrupter

铁芯式两极纵磁真空灭弧室的开发研究

These results differ from those for the bipolar background field case, in which the catastrophic energy threshold is almost independent of the magnetic fluxes of the flux rope and the extent to which the background field is open.

这与偶极场背景下的结果不同。在偶极背景场下，系统的灾变能阈与灾变点处磁绳的磁通和背景场的开放程度几乎没有关系。

The initial magnetic field is taken to be a force-free field, consisting of an isolated flux rope attached to the base and a bipolar background field surrounding it.

初始时背景场为无力场，磁绳附着于光球表面，外部为双极场。

The formation of the bipolar magnetic field of the sunspots in AR.

太阳活动区黑子的偶极磁场形成问题。

A flux rope is introduced within each bipolar field.

每个双极场内部各有一根磁绳，它们均附着于光球表面。

Majority of conventional power amplifiers are designed using bipolar technology on the basis of well-known merits of bipolar transistors.

大多数传统的音频功率放大器是用双极型工艺设计和制造，其基础在于良好的双极型三极管特性。

The paper points out that the dielectric insulation bipolar technology is main technology for implementing integrated circuit used in communication.

指出介质绝缘双极工艺是实现既经济又优良的电信通信用集成电路的主要工艺。

The paper focuses on circuit design of power switch with bipolar technology and audio amplifier with CMOS technology.

本文论述双极型功率开关电路和CMOS音频功率放大器电路设计。

The structure of a vertical multiple-gate MOSFET based on bipolar technology is presented.

提出了一种基于双极工艺的纵向多面栅MOSFET的结构和工艺。

A Study on 2-μ m High Speed Bipolar Technology

2μm高速双极工艺的研究

Complementary Bipolar technology has always been popular for analog IC designers due to its high speed and good performance on current drive.

互补双极技术凭借其高速、大电流驱动等优势一直受到模拟集成电路设计者的青睐。

Potential and Developing Trends of Silicon Ultrafast Bipolar Technology

硅超高速双极技术的潜力与变革方向

When the motion of the flux tube is oblique direction, most passage positions appear irregular FTEs, and the signatures of Bz is bipolar distribution.

当通量管在x方向有正或负速度分量即斜向运动时，大部分部位测到的B x呈不规则变化，B z表现为双极分布。