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以青藏高原特有两栖动物高山倭蛙（Nanorana parkeri）为研究对象，通过实验室内热驯化处理（26 ℃，以16 ℃为对照；2周），探究长期热驯化对其体内氧化应激水平和抗氧化防御系统的影响。结果显示：热驯化导致高山倭蛙骨骼肌中氧化型谷胱甘肽含量显著升高（t=1.4，df=10，p

为促进建筑工业化和住宅产业化，提高框架-支撑结构体系的抗震性能，提出了部分包覆钢-混凝土组合（partially encased composite brace， PEC）支撑。对3个采用PEC支撑的PEC框架试件和1个采用钢支撑的PEC框架试件进行了低周往复加载试验，研究了各试件的破坏模式、初始刚度、极限承载力、耗能能力等指标。结果表明：PEC框架与PEC支撑之间协同工作性能良好；PEC支撑试件相比纯钢支撑具有优势，初始刚度提升约24%~41%、极限承载力提升约29%~36%，耗能能力提升约7%~17%。基于试验结果采用ABAQUS软件进行非线性有限元分析，还原了试验试件的局部屈曲和整体失稳等几何非线性行为，有限元与试验得到的屈服荷载和峰值荷载的误差小于10%，可以较好的模拟出试件的承载特性。有限元分析表明：PEC支撑会先于框架梁和柱进入塑性，符合结构预期破坏顺序；在钢支撑节点腹板两侧设置混凝土或钢板加劲均能有效抑制此处出现应力集中和钢板局部屈曲。

针对脑血管病的危险因素积极进行早期干预管理是减少脑血管病危害最有效的方法。本章节介绍脑血管病高危人群管理的推荐意见，包括对不可干预和可干预血管危险因素的控制，阿司匹林在缺血性卒中一级预防中的应用以及首次卒中风险评估等方面。 Abstract: Early intervention to manage the risk factors of cerebrovascular disease is the most effective way to reduce the harm of cerebrovascular diseases. This chapter presents recommendations for the management of populations at high risk for cerebrovascular disease, including control of non-interventionable and interventionable vascular risk factors, the use of aspirin in the primary prevention of ischaemic stroke, and the risk assessment of first-time stroke.

近年爆发的贸易争端与新冠肺炎疫情，对世界油菜籽及其加工品的生产、贸易格局产生了一定影响，研究这一问题对保障中国油菜籽及其加工品进口供应链安全具有重要意义。总结分析了世界油菜籽及其加工品生产、贸易格局变动特征，实证分析了主要进出口国（地区）的显示性比较优势与贸易互补性，探讨了贸易争端与新冠肺炎疫情对世界油菜籽及其加工品生产、贸易格局的“双重冲击”。主要结论为：中长期看，“双重冲击”不会大幅改变基于比较优势的世界油菜籽及其加工品的生产、贸易格局；短期内，进出口大国之间的贸易争端将加剧国别替代，中国与加拿大、俄罗斯、澳大利亚的贸易规模将逐渐此消彼长；新冠肺炎疫情增加了贸易成本和供应链风险，对提升跨国物流与供应链绩效提出了更高要求。 In recent years, the outbreak of trade disputes and the epidemic situation of COVID-19 has a certain impact on the production and trade pattern of rapeseed and its processed products in the world. The study of this issue is of great significance to ensure the security of the import supply chain of rapeseed and its processed products in China. The characteristics of changes in the production and trade patterns of rapeseed and its processed products in the world were summarised and analysed, the demonstrated comparative advantages and trade complementarities of major importing and exporting countries(regions) were empirically analysed, and the "double impact" of trade disputes and the epidemic situation of COVID-19 on the production and trade pattern of rapeseed and its processed products in the world was explored. The main conclusions are as follows: in the medium to long term, the "double impact" will not significantly change the production and trade pattern of rapeseed and its processed products in the world based on comparative advantage. In the short term, trade disputes between major importing and exporting countries will intensify country substitution, and the scale of trade between China and Canada, Russia and Australia will one fade and the other grow. The epidemic situation of COVID-19 has increased trade costs and supply chain risks, and put forward higher requirements for improving the performance of cross-border logistics and supply chain.

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Garnet is one of common accessory minerals in granites and granitic pegmatites, and is capable of preserving crucial information regarding magma evolution and rare-metal mineralization. The Jing'erquan rare-metal deposit is the most representative granitic pegmatite-type lithium-berylium deposit in East Tianshan. The magmatic evolution processes and the metallogenic dynamic background for Li-Be-Nb-Ta enrichment are still unclear. EPMA and LA-ICP-MS in-situ microanalyses were conducted on garnets from the spoduemene-type pegmatite and its host muscovite granite from Jing'erquan rare-metal deposit. The results show that garnets in the muscovite granite and spoduemene-type pegmatite predominantly occur as spessartine-almandine solid solution, with the sum of the two endmember contents exceeding 95%, exhibiting Mn enrichment and Ca depletion; the garnet from the muscovite granite is enriched in HREE, depleted in LREE, and shows negative Eu anomaly, whereas the garnet from the spoduemene-type pegmatite is characterized by gradual depletion of HREE and significant negative Eu anomaly; the contents of Y, HREE, and Sc of the garnets exhibit a decreasing trend at the pegmatite stage. In general, the garnet in Jing'erquan spoduemene-type pegmatite is of typical magmatic origin. Trace elements including Li, Na, REE, and Y exhibit coupled substitution in the garnet, and the contents of REE and Y decrease with increasing magma differentiation. In addition, the garnets from the lithium pegmatite at Jing'erquan rare-metal deposit also show high Nb and Ta, which is capable of indicating Nb-Ta mineralization in granitic pegmatites. [ABSTRACT FROM AUTHOR]

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This experiment was conducted to study the effects of peanut seedling silage on growth performance, immunity and meat quality of mutton sheep. A total of 60 healthy mutton sheep with similar body weight were randomly divided into four groups with 15 replicates per group and one sheep per replicate. The mutton sheep in the control group were fed corn stalk silage as roughage, and peanut seedling silage was used to replace 25% (trial group A), 50% (trial group B) and 100% (trial group C) corn stalk silage in experimental groups, respectively. The pre-test period was one week and the formal test period was eight weeks. The results showed that compared with the control group, the final weight and average daily gain of mutton sheep in trial groups B and C were significantly increased (P<0.05), and the ratio of feed to gain was significantly decreased (P<0.05). Compared with the control group, the serum immunoglobulin A (IgA) and interleukin-10 (IL-10) levels of mutton sheep in trial groups B and C were significantly increased (P<0.05), the levels of interleukin-6 (IL-6), interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) were significantly decreased (P<0.05), and the CD4+ content and CD4+ /CD8+ ratio were significantly increased (P<0.05). Compared with the control group, the pH value and redness value of muscle in trial groups B and C were significantly increased (P<0.05), while the drip loss, brightness value and yellowness value were significantly decreased (P<0.05). The shear force of all trial groups was significantly decreased (P<0.05). Compared with the control group, the contents of palmitic acid and saturated fatty acid in muscle of trial groups B and C were significantly decreased (P<0.05), while the contents of erucic acid and monounsaturated fatty acid were significantly increased (P<0.05). Oleic acid content and ω-6/ω-3 ratio in muscle of mutton sheep in all experimental groups were increased (P<0.05). The study indicates that peanut seedling silage can improve the growth performance, immunity and mutton quality, peanut seedling silage can replace 50% and 100% corn straw silage effectively. [ABSTRACT FROM AUTHOR]

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Porphyry-type molybdenum (copper) deposits have long been a focus of geological studies. 770 Molybdenum(Copper) Deposit, a newly discovered porphyry-type deposit in the Northern Greater Khingan Mountains, has seen limited reporting. This study examines pyrite and chalcopyrite within 770 Molybdenum (Copper) Deposit using electron microscopy and EPMA(Electron Probe Micro-analysis) to investigate the crystal morphology and the major and trace element compositions of these sulfides, providing a comprehensive understanding of their chemical characteristics and geological significance. The 770 Molybdenum (Copper) Deposit, a large porphyry-type molybdenum (copper) deposit, has its ore bodies hosted in Late Jurassic granite porphyry. Alteration zones are divided into a central potassic zone and a peripheral pyrite-sericite zone. EPMA results show pyrite with sulfur content generally below 53. 45 %, iron content below 46. 55 %, and a w(S)/w(Fe) ratio≥1. 148, indicating that the deposit-s pyrite is low-iron, low-sulfur pyrite, formed under conditions of high sulfur fugacity. The trace-to-major element correlations suggest elements like Zn, Mo, Ni, Co, and As exist in pyrite as mineral inclusions. The w(Co)/w(Ni) ratio(2. 25-4. 50) in pyrite indicates a magmatic-hydrothermal origin, while the [n(Cu)＋n(Fe)]/n(S) ratio in chalcopyrite(average 0. 91) suggests formation in a mid to low-temperature(around 200 ℃) hydrothermal environment. [ABSTRACT FROM AUTHOR]

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The test of rod impact on TC4 titanium alloy plate with a thickness of 10 mm was carried out on a light gas gun,in order to study the damage behavior and the effect of projectile head shape on the anti-penetration performance of the target plate.The ballistic limit velocities of target plates were obtained under various impact conditions.The damage characteristics and mechanism of target plate were analyzed by microscopic observation.The results show that the failure modes of TC4 plates are different when impacted by blunt-nose projectile and ogival-nose projectiles,and the anti-penetration capability of target to ogivalnose projectile is better than that of bunt-nose projectile.After impacted by ogival-nose projectile,the front perforated and the back peeled off of targets were observed,as well as the shape of the back perforation is approximately conical.However,the damage of the target plate is shear plug type,accompanied by the neat edge and smooth inner wall of the impact hole.In addition,the adiabatic shear bands were observed by scanning electron microscope when the blunt-nosed projectile penetrated the target plate.

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In response to the poor physical properties, strong heterogeneity, high injection production ratio, and low formation pressure of ultra-low permeability reservoirs in the Ordos Basin, as well as the contradiction between the difficulty of establishing displacement in some reservoirs, the presence of injected water flowing along fractures, the small volume of water flooding and low recovery rate, the logging identification marks, stacking style, lateral contact mode, and water breakthrough characteristics of single sand bodies are first finely characterized. Secondly, a microscopic visualization simulation model was used to study the remaining oil occurrence patterns under different pore structures. Finally, the development of fractures and high permeability zones in the study area, as well as their water drive patterns, were summarized. The research results are ultimately applied to geological modeling to guide the fine injection and production adjustment of small reservoirs, determine the cyclic injection system and cycle, and construct a full life cycle fine injection and production technology for ultra-low permeability reservoirs. Guiding the injection and production adjustments of ultra-low permeability reservoirs in Huaqing and Huanjiang oilfields for about 15 000 times, with an average increase in oil recovery rate of 0. 2%, alleviating reservoir decline by 1. 2%, and an annual cumulative increase of over 50 000 tons of oil. [ABSTRACT FROM AUTHOR]

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