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集硒与非集硒植物中硒、硫元素间相互作用的研究

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土壤学进展 1995年第2期23卷 26-32,56页

作者： PaulF.Bell d.R.parker A.L.Page 王美珠

比较了溶液中 SeO_4、SO_4及它们之间相互作用对非集硒植物(苜蓿)和集硒植物(***)吸收硒和硫的影响,测定了在较长生长周期(21天以上)内这两类植物对化学特性相似的两类阴离子吸收的差异.结果表明,虽然 SO_4对植物吸收 SeO_4有竞争作用,... 详细信息

比较了溶液中 SeO_4、SO_4及它们之间相互作用对非集硒植物(苜蓿)和集硒植物(***)吸收硒和硫的影响,测定了在较长生长周期(21天以上)内这两类植物对化学特性相似的两类阴离子吸收的差异.结果表明,虽然 SO_4对植物吸收 SeO_4有竞争作用,但原生集硒植物具有优先吸 Se(与吸 S 相比)能力,甚至生长在高 SO_4土壤中,这类植物含 Se 量也很高.因此,原生集硒植物在生物改良盐化的硒污染土壤与沉积物方面很有潜力.

关键词：集硒植物植物硒硫相互作用吸收

drought and Associated Impacts in the Great Plains of the United States—A Review

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International Journal of Geosciences 2013年第6期4卷 72-81页

作者： Jeffrey B. Basara Joanna N. Maybourn Casey M. Peirano Jennifer E. Tate parker J. Brown Jake d. Hoey Brandon R. Smith 1School of Meteorology University of Oklahoma Norman USA 2Oklahoma Climatological Survey University of Oklahoma Norman USA 1School of Meteorology University of Oklahoma Norman USA 2University of Reading Reading UK School of Meteorology University of Oklahoma Norman USA

The Great Plains region of the United States is susceptible to drought of all kinds including meteorological/climatological, agricultural, hydrological, and socioeconomic. drought conditions in the region span varying spatial and temporal scales and the causes include: 1) certain synoptic conditions that favor drought such as mid-tropospheric ridging over the drought-affected area and a weak low-level jet;2) sea surface temperature anomalies and associated teleconnections;3) land-atmosphere coupling;and 4) anthropogenic effects. While drought can span as few as a couple of months, the most severe droughts can occur at the decadal scale such as the 1930s dust Bowl, the worst drought in recent history from a societal standpoint. Such droughts in the Great Plains have widespread impacts on agriculture, water resources, human health, and the economy.

关键词： drought Great Plains United States Rainfall Precipitation

Nucleic acid-based diagnostics for infectious diseases in public health affairs

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Frontiers of Medicine 2012年第2期6卷 173-186页

作者： Albert Cheung-Hoi Yu Greg Vatcher Xin Yue Yan dong Mao Hua Li Patrick H.K.Tam parker Y.L.Tsang April K.Y.Wong Michael H.K.Hui Bin Yang Hao Tang Lok-Ting Lau Neuroscience Research Institute/department of Neurobiology School of Basic Medical Sciences/Key Laboratory for NeuroscienceMinistry of Education/Key Laboratory for NeuroscienceMinistry of HealthPeking UniversityBeijing 100191China Hai Kang Life Corporation Limited Hong Kong SARChina and Beijing 100176China

Infectious diseases,mostly caused by bacteria and viruses but also a result of fungal and parasitic infection,have been one of the most important public health concerns throughout human *** first step in combating these pathogens is to get a timely and accurate diagnosis at an affordable *** kinds of diagnostics have been developed,such as pathogen culture,biochemical tests and serological tests,to help detect and fight against the causative agents of ***,these diagnostic tests are generally unsatisfactory because they are not particularly sensitive and specific and are unable to deliver speedy *** acid-based diagnostics,detecting pathogens through the identification of their genomic sequences,have shown promise to overcome the above limitations and become more widely adopted in clinical *** we review some of the most popular nucleic acid-based diagnostics and focus on their adaptability and applicability to routine clinical *** also compare and contrast the characteristics of different types of nucleic acid-based diagnostics.

关键词： nucleic acid-based diagnostics infectious disease PCR NASBA LAMP microarray LOAC public health affairs

中枢神经性疼痛的机制:对脊髓空洞症患者的身心和fMRI联合研究

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世界核心医学期刊文摘（神经病学分册） 2006年第9期2卷 36-37页

作者： ducreux d. Attal N. parker F. Bouhassira d. 赵天智(译) 不详 INSERM U-792 Centre d'Evaluation et de Traitement de la Douleur CHU Ambroise Paré 9 avenue Charles de Gaulle 92100 Boulogne-Billancourt France

The pathophysiology of central pain syndromes is still poorly understood and their treatment remains a major challenge. It has long been suggested that lesions of the spinothalamic pathways are necessary for developing these pain syndromes. The recently proposed thermosensory disinhibition theory suggests that reduction of the inhibition of thermal sensory afferents that affect nociceptive systems may play a major pathophysiological role. Syringomyelia, which is frequently associated with central neuropathic pain, is characterized by a selective or preferential lesion of the spinothalamic tract resulting in thermosensory deficits of various extents and magnitudes. Thus, syringomyelia represents a unique ‘pathological model’particularly suited to investigating the relationship between spinothalamic tract dysfunction, thermosensory deficits and pain. Here, we systematically compared the sensory loss (thermal and mechanical), using quantitative sensory testing, between 46 consecutive syringomyelia patients with or without neuropathic pain. We then further investigated the mechanisms of evoked pains in these patients, using functional MRI (fMRI) in a subgroup of patients with cold or brush-evoked allodynia, compared with patients without pain and healthy volunteers. We found no significant difference in the magnitude or extent of sensory deficits between patients with or without neuropathic pain, suggesting that lesions of the spinothalamic pathways are not sufficient for developing central pain. However, a different pattern of sensory deficits was observed between patients with spontaneous pain only (n = 11) and patients with both spontaneous pain and allodynia (n = 20), suggesting that the mechanisms of central pain are not univocal. In patients with spontaneous pain only, the thermal sensory loss was significantly more asymmetrical and there was a direct relationship between the extent of thermosensory deficits (i.e. deafferentation) and the intensity of burning pain

关键词：神经性疼痛脊髓空洞症中枢性疼痛 fMRI 病理生理学机制脊髓丘脑束自发性疼痛感觉缺失

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煤瀝青粘结剂对碳素制品性质的影响

轻金属 1966年第1期 27-34页

作者： d.O.Baumbach P.L.Walker W.E.parker 续正国

以一种煅烧过的延迟石油焦分别和十二种在性质上显著不同的中等软化点煤沥青混合,模压制成碳索制品。这些制品和上述的焦炭分别在1150～3000℃之间的六种温度下进行热处理。测定了这些制品和焦炭的表观密度、空气拼代密度BET表面积和晶... 详细信息

以一种煅烧过的延迟石油焦分别和十二种在性质上显著不同的中等软化点煤沥青混合,模压制成碳索制品。这些制品和上述的焦炭分别在1150～3000℃之间的六种温度下进行热处理。测定了这些制品和焦炭的表观密度、空气拼代密度BET表面积和晶相参数等物理性质。对碳素制品还测定了对CO2的反应性、电阻率、热膨胀系数和抗弯强度等性质。将所有的碳素制品加热到同样的最终温度,一般只发现它们在性质上仅有微小的不同。这可能导致两种结论:一种是,煤沥青在各个热处理温度下产生具有类似性质的粘结剂碳;第二种是,由于碳素制品中沥青残碳量较少（约占15％）,这些粘结剂碳在性质上的差异不足以使碳素制品在性质上产生重大的差别。在从焙烧到石墨化的温度内,可以观察到碳索制品在物理性质上发生主要的改变。这些性质的变化与固体碳素材料性质的变化具有近乎平行的关系。

关键词：碳素制品焦炭骨料固体燃料集料热处理温度反应性表观密度石油焦粘结剂胶结剂

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与CMOS相容的嵌入式NVM技术(英文)

世界科技研究与发展 2007年第1期29卷 1-8页

作者：步建康 Courtney parker William Belcher 美国国家半导体公司

嵌入式NVM增强片上系统的功能和灵活性。对只需有限密度有限性能的嵌入式NVM的应用,传统的浮栅/SONOSNVM成本昂贵。与CMOS相容的嵌入式NVM技术是当前工业界的成功解决方案,并在诸如模拟技术微调应用中的位元级一直到数据或代码储存的千... 详细信息

嵌入式NVM增强片上系统的功能和灵活性。对只需有限密度有限性能的嵌入式NVM的应用,传统的浮栅/SONOSNVM成本昂贵。与CMOS相容的嵌入式NVM技术是当前工业界的成功解决方案,并在诸如模拟技术微调应用中的位元级一直到数据或代码储存的千位元等级取得越来越广泛的应用。本文描述了与CMOS相容的嵌入式NVM技术的基本原理及特性,并简要介绍了工业界几种具代表性的与CMOS相容的嵌入式NVM技术。本文重点分析了我们在技术研发中遇到的独特的挑战及其解决方案。实验结果证明我们的方案有效地解决了面临的问题。

关键词： CMOS相容 NVM 氧氮化硅陷阱辅助隧道效应(TAT) 漏极雪崩热载流子(dAHC) 耐久力

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二十世纪的西方地理政治思想

1992年

作者：杰弗里·帕克(Geoffrey parker)

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全面监控国际电子间谍系统揭秘

2000年

作者：（英）约翰·帕克（John parker）王帆曾微译

本书共分三部分，第一部分讲述了今天监控对你的直接影响；第二部分考察了实行监控的主要国家机构，包括美国国家安全局和英国军情五处；第三部分更加深入地考察了今天的间谍、特工和私人机构所采用的设备和技术。

ISBN: (数字)7561321066

ISBN: (纸本)7561321066

关键词：无线电通信监听设备

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两种3d测量比较

两种3D测量比较