1.There are a number of determination methods for cerebrovascular reserve,such as position emission tomography(PET),single photon emission computed tomography(SPECT),Xenon-133 inhalation technique,Xenon CT,perfusion CT, magnetic resonance imaging(MRI),transcranial Doppler(TCD),transcranial harmonic perfusion imaging(HPI),near infrared spectroscopy(NIR),and Laser Doppler vibrometry(LDV), however,there have been no unified criteria up to now.
脑血流储备的检测方法较多,如正电子发射体层摄影、单光子发射计算机体层摄影、氙吸入技术、氙-CT、灌注CT、MRI、经颅多普勒、经颅超声波谐振灌流成像、近红外线光谱、激光多普勒,但迄今尚无统一的标准。
2.The rate con-stantsof photolysis of nitrochlorobenzene in pure water(Xenon lamp),pure water(300-400 nm rays),pure water (sun light) and natural water(sunlight) were determined. The effects of pH, humic substances, nitrate and inorganic salt on photodegradation of nitrochlobenzene in aqueous solution were studied in the laboratory with artificial(Xenon lamp) sunlight.
从它们在纯水(氙灯下)、纯水(300—400nm光照下)、纯水(阳光下)、天然水(阳光下)中分解的速度常数来看,pH、腐殖质、硝酸根对光解影响较大,无机盐对光解无显著影响,硝基氯苯在pH>6的纯水中光解有中间产物生成。
3.The static adsorption isotherms and adsorption rates of krypton and xenon at 201 K on viscose-based activated carbon fibres(VACF),pitch-based ACF(PACF),and granular activated carbon (GAC) are measured on a Micromeritics ASAP 2010M specific surface area and pore size distribution instrument by changing working gas of the instrument from N_2 to krypton or xenon.
研究了粘胶基活性炭纤维(Viscose basedACF,VACF)、沥青基活性炭纤维(Pitch basedACF,PACF)和颗粒活性炭(Grainactivatedcarbon,GAC)在201K时对Kr的静态吸附等温线和吸附速度,并与同样条件下VACF对Xe的吸附进行了比较。
4.However, there was no significant difference in total flavonol content in tomato seedling leaves grown under sulfur lamp and xenon lamp, indicating either or both of DFR and LDOX-mediated steps in anthocyanin synthesis pathway were inhibited in tomato seedling leaves grown under xenon lamp with low red/far red ratio.
HPLC分析发现,硫灯和氙灯光源下生长的番茄幼苗叶片中黄酮醇总量没有显著差异,由此推断低R/FR下花青素合成抑制位点是二氢黄酮醇还原酶或白花色素双氧酶两个催化步骤。
5.Nobody has yet measured the concentration of xenon in comets, but recent laboratory experiments on the trapping of gases by ice forming at low temperatures suggest that comets do not contain high concentrations of the xenon.
没有人测量过彗星里面氙的含量，但最近通过低温下形成的冰对气体的捕获实验表明，彗星不可能有高的氙含量。
6.Why no Xenon flash and lens cover/shutter?
为什么没有氙气闪光灯和镜头盖？
7.The author and two colleagues recently used measurements of xenon gas (a product of uranium fission) to deduce that one of these ancient reactors must have operated with a duty cycle of about half an hour on and at least two and a half hours off.
作者与两位同事最近透过氙气（铀的核分裂产物）的测量推测，这些远古反应器其中之一必定曾经以运作半小时、关闭两小时半的周期进行核反应。
8.Our key insight was the realization that different xenon isotopes in our Oklo sample were created at different times—following a schedule that depended on the half-lives of their iodine parents and tellurium grandparents.
我们的关键性认知是理解到，欧克陆标本中各种氙同位素是在不同时间生成的，时程表取决于它们的母元素碘和再上一代元素碲的半衰期。
9.Remarkably, these grains showed the highest concentration of xenon ever found in any natural material.
值得一提的是，这些颗粒中氙的浓度，是有史以来在自然物质中所见最高的。
10.That xenon could notnform chemical compounds etx as honce believed by scientists.
科学家曾相信：氙气是不能形成化合物的。
