VDMOS均匀掺杂外延区的优化设计

本文通过外延区为均匀掺杂的ＶＤＭＯＳ穿通击穿条件和外延区比导通电阻Ｒｏｎ的理论分析，首次得到了Ｒｏｎ随外延区参数、击穿电压变化的简捷普遍关系式．在此基础上提出了ＶＤＭＯＳ为均匀掺杂外延区时的优化设计理论：对于各种高压ＶＤＭＯＳ，只要外延区厚度取为同衬底浓度下突变结击穿时耗尽层宽度的最佳分割长度，即穿通因数Ｆ的倒数η为０７５ 时，就可保证外延区Ｒｏｎ为最小．凭借此理论，本文首次推出了ＶＤＭＯＳ外延区优化设计的严格理论公式，纠正了一些文献引用经验关系或突变结关系导出的设计公式的不准确性及错误结论．这些理论结果可直接作为功率ＭＯＳ等非电导调制器件的设计准则．

VDMOS均匀掺杂外延区优化设计的简单理论

在高压ＶＤＭＯＳ器件中，保证足够高的漏源击穿电压ＢＶＰＴ和尽可能低的比导通电阻Ｒｏｎ是设计中必须同时考虑的两个相互矛盾的主要方面。对于耐压高的ＶＤＭＯＳ，Ｒｏｎ主要由外延区决定。本文通过外延区为均匀掺杂的ＶＤＭＯＳ穿通击穿条件和外延区比导通电阻Ｒｏｎ的理论分析，首次得到了Ｒｏｎ随外延区参数、击穿电压变化的简捷普适关系。在此基础上提出了ＶＤＭＯＳ为均匀掺杂外延区时优化设计的简单理论：对于各种高压ＶＤＭＯＳ，只要外延区厚度取为同衬底浓度下突变结击穿时耗尽层宽度的最佳分割长度，即利用系数η０＝ ０．７５，就可保证外延区Ｒｏｎ 为最小。凭借此理论，可以用熟知的突变结击穿参数计算ＶＤＭＯＳ外延区优化参数，而且结果与其它文献的理论计算相吻合，二者相差不大于３％ 。这一理论结果可直接作为功率ＭＯＳ等非电导调制器件的设计准则。

近距离煤层群外延火区灭火技术

为了消灭由4238工作面发泡材料充填不当导致发火并蔓延成状态极其复杂的+1030水平四采火区,根据矿井正压通风与倾斜近距离煤层群赋存特点,制订了"先闭后缩再治、先降温再充填、先核心后外围、以隔离火区保障生产接替为优先目标"的综合灭火方针,采用正压火区远距离封闭与逐步缩封、新型无机材料巷道充填与小断面恢复、移动式液态二氧化碳井下直注、核心火区下施工措施巷等一系列灭火措施对该种外延火区进行治理。结果表明:火势得到了有效地控制,取得了阶段性灭火成果,但外延火区状态依然较为脆弱,后续进一步采取粉煤灰复合胶体灌注措施,逐次充填火区核心与外围区域内巷道,隔离火区掩护下水平掘进与接替,达到了火区治理的最终目的。

低功耗VDMOS器件用硅外延片工艺研究

文章采用化学气相沉积方法（CVD）在6英寸〈100〉晶向的重掺Sb硅衬底（0．01～O．02Ωｃｍ）上生长N／N＋型硅外延片，采用SRＰ扩展电阻测试测试外延层过渡区宽度，傅里叶光谱仪测试外延层厚度，cv 汞探针测试仪测试外延层电阻率；制备外延层厚度56μm、电阻率1312·ｃｍ的硅外延片，并通过展宽外延层过渡区由4μm增长至13μｍ，有效降低外延片串联电阻，从而实现VDMOS器件的导通电阻由4．37Ω降低至3．59Ω，VDMOS器件导通电阻降幅达到17．85％.

体育中心周边区域城市设计初探

从城市设计的角度入手,对大连市体育中心及其周边区域的城市设计进行了研究,提出将体育中心周边区域作为体育主导功能的城市外延区,从而塑造整体性的城市空间景观,促进体育中心与周边地区的整体融合。

Selective Area Growth InGaAsP by MOVPE

The wide stripe (15μm) selective area growth (SAG) of InGaAsP by low pressure MOVPE is systematically investigated.The characteristics of the growth ratios,thickness enhancement factors,bandgap modulation,and composition modulation vary with the growth conditions such as mask width,growth pressure.Flux of Ⅲ group precursors are outlined and the rational mechanism behind SAG MOVPE is explained.In addition,the surface spike of the SAG InGaAsP is shown and the course of it is given by the variation of Ⅴ/Ⅲ.

Relationship Between the Central Hypotensive Effect of Acupuncture or Melatonin and the Changes of Medullary Amino Acid Neurotransmitter

To investigate whether changes of amino acid neurotransmitter releases in the rostral ventrolateral medulla （rVLM） were related to acupuncture and to the antihypertensive effect of melatonin （Mel） microinjected into the anterior hypothalamic area （AHA） of rats with stress-induced hypertension （SIH）, as well as to compare and analyze the relationship between the both antihypertensive mechanisms of acupuncture and of Mel in the AHA. Methods： Animal model of SIHR was made by electric foot shocks combined with noises. Electroacupuncture （EA） was used and “Zusanli” acupoint of both side was selected. The technique of drug microinjection into the brain was used to observe the change of blood pressure （BP）, and synchronously, brain microdialysis was performed for collecting dialysate samples, and then the concentration of amino acid neurotransmitters in the dialysate samples was determined by high performance liquid chromatography combined with fluorescent detection （HPLC-FD）. Results： After the animal received stress treatment, the BP elevated, synchronously, the release of glutamate （Glu） in the rVLM increased, and when EA was performed, the elevated BP of the rats with SIH decreased, simultaneously, the release of Glu in the rVLM decreased also. After Mel was microinjected of into the AHA of the SIHR, the elevated BP attenuated, meanwhile, the release of Glu decreased, and those of γ-aminobutyric acid （GABA） and taurine （Tau） increased in the rVLM.Administration of bicuculline, an antagonist of GABAA receptor, into the rVLMprior to microinjection of Mel imo the AHA could partially block the depressor effect of Mel in the AHA. Conclusion： The decrease in the release of Glu in the rVLM contributes to the antihypertensive effect of both acupuncture and Mel in the AHA in the rats with SIH, and the increase in the release of GABA and Tau in the rVLM is also im0ortam to Mel in the AHA.

Mechanism of the Reversal Effect of Acupuncture on the Fall of Blood Pressure Induced by Angiotensin-(1-7)in the Caudal Ventrolateral Medulla of Rats

Objective：To investigate the mechanism of the reversal effect of acupuncture on the fall of blood pressure induced by angiotensin （1-7）[Ang-（1 7）] in the caudal ventrolateral medulla （CVLM） of rats. Methods： Ang-（1-7） and its selective receptor antagonist （DAla7）, Ang（1-7） and Ang（779） were microinjected into the CVLM respectively to induce the change of blood pressure, during which, the concentrations of amino acid neurotransmitters were detected by means of microdialysis and high performance liquid chromatography （HPLC）combined with fluorescent detector, on the other hand, the effects of electro-acupuncture （EA） on the level of blood pressure and the concentrations of amino acid neurotransmitters were also observed. Results： Unilateral microinjection of Ang（1 7） into the CVLM could decrease the blood pressure （BP）, which was accompanied by an increase in the release of Glu and a decrease in the release of Tau in the same site; Whereas microinjection of Ang-779 into the CVLM could elevate BP, which was accompanied by a decrease in the release of Glu and an increase in the release of Tau; EA at acupoint Zusanli （ST 36） for 20 min could inhibit the fall of blood pressure induced by microinjection of Ang-（1-7） into the CVLM and the elevation of blood pressure induced by microinjection of Ang-779 into the CVLM, and in the meantime, it could inhibit the changes of the release of Glu and Tau induced by microinjection of Ang-（1-7） and Ang-779 into the CVLM. Conclusion： The reversal effect of EA on the fall or elevation of blood pressure induced by microinjection of Ang-（1-7） or Ang-779 into the CVLM might be related to the changes of Glu and Tau release.