The complex ray theory provides a simple and useful approach to analyze the propagation and scattering of HF EM waves in various complicated environments.
复射线理论为高频电磁波在各种复杂环境中的传播和散射提供了一种简便而有效的分析方法。
Future research ought to focus on obtaining a much better knowledge of genetics and HF, especially both genetic risk factors for development of HF and genetic markers as tools to guide prevention.
未来的研究主要集中于获得遗传学和心力衰竭的更多知识，特别是遗传学危险因素对心衰的进展和遗传学标记物作为心衰预防的工具的知识。
Doubling hf-current results in a doubling of current density and a fourfold heat provided that the area of effective contact between the tissue ang the electrode remains constant.
如果人体组织和电极之间的有效接触面积保持不变，那么高频电流强度扩大一倍将会使电流密度增大一倍，并产生四倍的热量。
Conclusions: the results suggest that angiostatin, which can attenuate the activity of MSC, might play a role in the progression of HF.
结论：这个结果提示能减弱间充质干细胞活性的血管他丁可能在心力衰竭的病程中起到作用。
All patients had either a recent hospitalization for HF or corroborative evidence of HF, such as pulmonary congestion or left-ventricular hypertrophy.
所有患者或有近期因心衰入院史或者有确定心衰证据，例如肺淤血或左室肥大。
HF有一种刺激性气味。
We compared on-line hemofiltration to high-flux hemodialysis (HF-HD) in patients in a sequential manner.
我们在患者中以连续性方式比较了在线血液滤过和高通量血液透析（HF-HD）的疗效。
As LVEF is a predictor of survival, they pointed out, the new data suggest that there is indeed potential for improved outcomes with CPAP in patients with concomitant HF and OSA.
他们指出，LVEF是生存率的预测因子，因此新研究数据表明对患有osa的心衰患者进行CPAP治疗具有改善预后的潜力。
A struggling U. S. economy is not getting any help from the battered hf using market.
美国房屋市场萎靡不振给美国困境中的经济雪上加霜。
Background Heart failure (HF) is a complicated clinical syndrome.
心力衰竭(HF)是一种复杂的临床综合症。
HF radio communication has a significant communication blind zone in the range of 200 kilometers usually. This disadvantage restricts its application in the near range tactical mobile communication.
短波无线电通信在200公里范围内通常存在着盲区，这一特点制约了其在近距机动通信中的应用。
HF has a pungent odor. It is extremely corrosive.
HF有一种刺激性气味。它是极强的腐蚀剂。
A diagnosis method of zero-value insulator based on electromagnetic wave detection is put forward, namely partial discharge detection method jointly using UHF and HF.
提出了一种基于电磁波检测的零值绝缘子诊断方法，即联合采用基于(特高频)uhf和(高频)HF的局放电流检测方法。
Super resolution for target range and azimuth Angle of a novel bistatic HF-Surface Wave Radar (HF-SWR) is investigated.
本文研究了一种新的高频地波超视距雷达目标距离以及方位角超分辨问题。
In order to realize that the watercraft can be monitored, commanded and controlled in the whole process, a watercraft dynamic monitoring system based on HF transceiver was designed and complemented.
为了实现对出航船艇的全程监控和指挥调度，设计并实现了一种基于短波电台的船艇动态监控系统。
At last, a practical HF broadband plane array system is designed.
最后设计出一套实用的阵列天线系统。
Skin contacted by HF, vapor, or aqueous solution rapidly produces an erythematous (reddened) area, often with a white or gray color at the surface caused by coagulation of tissue.
接触HF、蒸气或水溶液的皮肤会迅速产生一块变红的区域，通常在表面带有组织凝结造成的白色或灰色。
NF3 has a relatively short atmospheric lifetime (740 years) and dissociates more readily than C2F6 and CF4. HF ultimately diffuses down to the troposphere where it is removed by wet deposition.
NF3具有相对短的大气寿命（740年），比C2F6和CF4。更容易分解。HF最终扩散到大气中，在大气中它通过湿沉积被除去。
This paper presents an improved arithmetic for extracting and compensating the phase-path variations caused by the ionospheric disturbance in a HF sky-wave OTH radar with FMCW waveform.
针对采用调频连续波(FMCW)体制的天波超视距雷达的应用场合，提出了一种电离层扰动(慢相径变化)补偿改进算法。
Hydrofluoric acid (HF), a colorless inorganic acid with mild irritating odor, is used extensively in various industries, such as the semiconductor industry and the electropolishing of metal.
氢氟酸(HF)为一无色略带刺激味的无机酸，普遍地被使用于各种工业，如半导体工业及金属除锈等。
In this paper, a DSP-based HF channel simulator within audio bandwidth is designed and implemented based on the concerned theory on the effects caused by the ionosphere in radio wave.
根据电离层影响无线电波传输的有关理论，本文设计并实现了一种基于DSP的话音带宽短波信道模拟器。
By analysis and summarization of HF aeronautical communication site setup, a mathematical model based on month median about REL is proposed, and then with VOACAP, the mathematical model is verified.
在对短波航空通信站点设置进行总结和分析的基础上，建立以月中值为基础的REL数学模型，并采用VOACAP对所提出的数学模型进行了验证。
Chronic kidney disease is a risk factor for heart failure (HF).
慢性肾脏疾病是心力衰竭(HF)危险因子。
The HF Broadband receiver is a focus of research in the domain of HF receiving in recent years, and the receivers channelization is one of the very important parts.
短波宽带接收机是短波接收领域近年来研究的热点，接收信道化处理则是其中一个非常重要的环节。
The measurements of HF Doppler shift in the ionosphere have long been a powerful tool in monitoring the ionospheric disturbances due to its features of continuity in time and simplicity.
由于地面电离层多普勒频率偏移测量具有时间连续、设备相对简便等固有特征，它特别适合于扰动监测。
The digitalization of a HF receiver is an important spot in the current communications research field.
短波接收机的数字化是当前短波通信研究的一个重点。
The digitalization of a HF receiver is an important spot in the current communications research field.
短波接收机的数字化是当前短波通信研究的一个重点。
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