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Measurement of the A-Value of the Intersystem Transition in Al II at 2670 Å: Å Progress Report [PDF]
International Astronomical Union Colloquium, 1984 Ratios of intensities of spectral lines produced in the radiative decay of collisionally-excited levels of atomic ions are versatile indicators of electron density in astrophysical plasmas when one of the lines involves a metastable level (see the review by Feldman 1981 and references therein). Radiative transition probabilities (A-values) and electron
B. Carol Johnson, H.S. Kwong
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Optical spectrum of the post-AGB Star HD56126 in the wavelength interval 4010-8790 Å Å [PDF]
Astrophysical Bulletin, 2007 The optical spectrum of the post-AGB star HD56126 identified with the infrared source IRAS07134+1005 is studied in detail using high spectral resolution observations (R = 25000 and 60000) performed with the echelle spectrographs of the 6-m telescope. A total of about one and a half thousand absorptions of neutral atoms and ions, absorption bands of C2,
V. G. Klochkova +3 more
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Gaoya dianqi, 2022 钻跨一体杆塔是一种能同时实现线路钻越和跨越的新型杆塔，该杆塔目前处于设计阶段但缺乏相应的防雷研究。为了研究不同的防反击措施对110 kV钻跨一体杆塔反击耐雷性能的影响，选取技术经济指标较优的防反击措施，文中采用电磁暂态程序ATP-EMTP仿真计算了110 kV钻跨一体杆塔在两种不同的防反击措施下的反击耐雷水平，比较分析了两种不同的防反击措施的技术经济性。针对钻跨一体杆塔导线布置方式与普通杆塔的不同，文中在计算过程中特别考虑了杆塔竖直导线上感应电压的电磁分量。研究结果表明 ...
盛金马 +6 more
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Dianci bileiqi, 2023 为提高输电线路杆塔接地装置设计的科学性和针对性，在分析反击跳闸率和接地电阻的影响因素的基础上，提出了基于输电线路反击跳闸率控制目标和蒙特卡洛法择优筛选的杆塔接地电阻控制值的差异化设计方法。即充分考虑影响反击跳闸率的各因素，根据杆塔结构参数、绝缘子串参数、沿线土壤电阻率、地形、雷电参数等进行反击跳闸率计算和区段划分，对各区段反击跳闸率进行加权平均获得线路总体反击跳闸率，再将其与反击跳闸率控制目标进行比对，并通过蒙特卡洛法实现在多种区段划分和接地电阻控制值中的择优选择，作为杆塔接地电阻的优化设计控制值 ...
童雪芳 +5 more
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The Tariff Trap: Why Funding Health Programs Through Tariffs Harms Both Health and Democracy
World Medical &Health Policy, Volume 18, Issue 2, June 2026.ABSTRACT In 2025, the Trump Administration imposed significant tariffs on imports to the US as part of aggressive trade negotiations with other countries. Tariffs have important impacts on health that include increases in the prices that consumers and businesses pay for goods and potential damage to global supply chains.
Holly Jarman, Miranda Yaver
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Policy, Waste, and Power: Textile Dumping in Chile's Atacama Desert
Latin American Policy, Volume 17, Issue 2, June 2026.ABSTRACT Globally, 87% of textile fibers end up incinerated or in landfills, with Chile bearing the brunt of this crisis. Every year, 39,000 tons of discarded clothing are illegally dumped in the Atacama Desert, turning it into a sacrifice zone for the Global North's waste economy.
Emma Minerva Brambilla
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“American Islam”: The Politics of Religious Authenticity in Iran
Digest of Middle East Studies, Volume 35, Issue 3, Summer 2026.ABSTRACT This article analyzes “American Islam” as a political category of religious authenticity in the Islamic Republic of Iran rather than as a fixed theological concept. Using a critical discourse‐analytic framework, it examines how Ayatollah Khomeini and Ayatollah Khamenei construct and operationalize the opposition between pure Muhammadan Islam ...
Fateh Saeidi
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Single‐atom catalysis hinges on fundamental challenges in precisely controlling metal‐support interactions and rationally regulating metal–adsorbate relationships. Herein, we report a universal strategy for constructing highly efficient and well‐defined Cu(I) single‐atom catalysts based on a trifurcate AlL3 molecular support.
Donghui Zhang +9 more
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Lung cancer remains the leading cause of cancer‐related deaths worldwide, yet immune checkpoint blockade (ICB) is often compromised by an immunosuppressive tumor microenvironment (TME) with acidosis, hypoxia, and poor T cell infiltration. Here, we develop a TME‐responsive nanoplatform (MgH2@Lip/PD‐L1) that couples hydrogen gas therapy with PD ...
Xuyu Gu +5 more
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Dianci bileiqi, 2016 为了减少雷害事故的发生,为输电线路防雷提供科学依据,计算输电线路雷电反击跳闸率时必须考虑杆塔接地体冲击特性。通过EMTP建立了线路及杆塔模型,考虑雷电流作用下接地体冲击特性,分析线路反击时杆塔和接地体暂态电压变化规律。计算不同土壤电阻率和接地体长度下线路反击跳闸率,同时讨论工频电压对反击跳闸率的影响。分析结果表明:雷电流幅值较大时,接地体冲击接地电阻降低明显。工频电压对线路反击跳闸率有一定影响。增加接地体长度和降低土壤电阻率可以有效减少线路反击跳闸率。
张家祥, 张桂林
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