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Cadmium and Zinc Accumulation in Maize Grain as Affected by Cultivars and Chemical Fixation Amendments

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Pedosphere 2011年第5期21卷 650-656页

作者： GUO xiao-fang WEI Ze-Bin WU Qi-Tang QIU Jin-Rong ZHOU Jian-Li Key Laboratory of Ecological Agriculture of Ministry of Agriculture of China College of Natural Resources and Environ- ment South China Agricultural University Guangzhou 510642 (China) South China Institute of Environmental Sciences Ministry of Environmental Protection Guangzhou 510655 (China) College of Agriculture Yangtze University Jingzhou 434025(China)

A field experiment was conducted to investigate the effects of soil amendments(lime,nano-Si foliar solution and used diatomite) on the growth and metal uptake of three maize(Zea mays L.) cultivars grown in a Cd and Zn-contaminated acidic *** addition of lime significantly increased the maize grain yields and decreased the concentrations of Zn and Cd in the grains and shoots of maize when compared with the *** the three maize cultivars,Yunshi-5 accumulated the lowest amounts of Cd and Zn in the *** concentrations of Zn and Cd in the grain of Yunshi-5 conformed to the Chinese feed *** data revealed that a combination of low metal-accumulating maize and chemical fixation could effectively provide a barrier to prevent metals from entering the human food chain.

关键词： grain yield heavy metal low metal-accumulating cultivar Zea mays L.

Experimental distillation of tripartite quantum steering with an optimal local filtering operation

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Photonics Research 2024年第3期12卷 552-562页

作者： QIAN-XI ZHANG xiao-XU fang HE LU School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Shenzhen Research Institute of Shandong University Shenzhen 518057China

Multipartite Einstein-Podolsky-Rosen(EPR)steering admits multipartite entanglement in the presence of uncharacterized verifiers,enabling practical applications in semi-device-independent *** applications generally require stronger steerability,while the unavoidable noise weakens steerability and consequently degrades the performance of quantum information ***,we propose the local filtering operation that can maximally distill genuine tripartite EPR steering from N copies of three-qubit generalized Greenberger-Horne-Zeilinger states,in the context of two semi-device-independent *** optimal filtering operation is determined by the maximization of assemblage *** and numerical results indicate the advantage of the proposed filtering operation when N is finite and the steerability of initial assemblages is ***,a proof-of-principle demonstration of two-copy distillation is realized with the optical *** advantage of the optimal local filtering operation is confirmed by the distilled assemblage in terms of higher assemblage fidelity with perfectly genuine tripartite steerable assemblages,as well as the greater violation of the inequality to witness genuine tripartite steerable *** results benefit the distillation of multipartite EPR steering in practice,where the number of copies of initial assemblages is generally finite.

关键词： filtering distillation optimal

Uniqueness on Difference Operators of Meromorphic Functions of Infinite Order

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Acta Mathematica Sinica,English Series 2024年第2期40卷 511-527页

作者： Hui LI Ming Liang fang xiao YAO School of Science China University of Mining and TechnologyBeijing 100083P.R.China Institute of Mathematics Academy of Mathematics and System SciencesChinese Academy of SciencesBeijing 100190P.R.China School of Sciences Hangzhou Dianzi UniversityHangzhou 310012P.R.China School of Mathematical sciences and LPMC Nankai UniversityTianjin 300071P.R.China

We investigate the uniqueness problems of meromorphic functions and their difference operators by using a new *** is proved that if a non-constant meromorphic function f shares a non-zero constant and ∞ counting multiplicities with its difference operators Δcf(z) and Δ_(c)^(2)f(z), thenΔcf(z)≡Δ_(c)^(2)f(z).In particular,we give a difference analogue of a result of *** method has two distinct features:(ⅰ) It converts the relations between functions into the corresponding *** makes it possible to deal with the uniqueness problem by linear algebra and combinatorics.(ⅱ) It circumvents the obstacle of the difference logarithmic derivative lemma for meromorphic functions of infinite order,since this method does not depend on the growth of the ***,the idea in this paper can also be applied to the case for several variables.

关键词： Uniqueness meromorphic functions difference operators infinite order

预制装配式混凝土外墙施工技术和节点防水技术研究

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中国建筑防水 2018年第6期 25-28页

作者：肖芳李明广东交通职业技术学院广东广州510650 广州万科房地产有限公司广东广州510000

以广州某工业化建筑住宅小区项目为背景,详细介绍了PC外墙施工和节点防水技术。PC外墙安装的关键点是控制墙体的垂直度和水平度。本工程PC外墙防水采用构造防水和材料防水相结合的方法,选用抗污染硅酮密封胶进行外墙接缝处防水密封,取... 详细信息

以广州某工业化建筑住宅小区项目为背景,详细介绍了PC外墙施工和节点防水技术。PC外墙安装的关键点是控制墙体的垂直度和水平度。本工程PC外墙防水采用构造防水和材料防水相结合的方法,选用抗污染硅酮密封胶进行外墙接缝处防水密封,取得了良好的效果。

关键词：预制装配式外墙施工技术节点防水抗污染硅酮密封胶

Design and Implementation of Nonlinear Precoding for MIMO-SDMA Toward 6G Wireless

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China Communications 2024年第1期21卷 69-87页

作者： Chaowu Wu Yue xiao Shu fang Gang Wu National Key Laboratory of Wireless Communications University of Electronic Science and Technology of ChinaChengdu 611731China

In this paper,we present a novel and robust nonlinear precoding(NLP)design and detection structure specifically tailored for multiple-input multipleoutput space division multiple access(MIMO-SDMA)systems toward 6G *** approach aims to effectively mitigate the impact of imperfect channel estimation by leveraging the channel fluctuation mean square error(MSE)for reconstructing a highly accurate precoding matrix at the ***,we introduce a simplified receiver structure that eliminates the need for equalization,resulting in reduced interference and notable enhancements in overall system *** conduct both computer simulations and experimental tests to validate the efficacy of our proposed *** results reveals that the proposed NLP scheme offers significant performance improvements,making it particularly well-suited for the forthcoming 6G wireless.

关键词： MIMO-SDMA nonlinear precoding Tomlinson-Harashima precoding(THP) vector perturbation(VP)

Structural and magnetic properties of micropolycrystalline cobalt thin films fabricated by direct current magnetron sputtering

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 384-394页

作者： Kerui Song Zhou Li Mei fang Zhu xiao Qian Lei School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics and electronicsCentral South UniversityChangsha 410083China Key Laboratory of Non-Ferrous Metal Materials Science and Engineering Ministry of EducationChangsha 410083China

Pure cobalt(Co)thin films were fabricated by direct current magnetron sputtering,and the effects of sputtering power and pres-sure on the microstructure and electromagnetic properties of the films were *** the sputtering power increases from 15 to 60 W,the Co thin films transition from an amorphous to a polycrystalline state,accompanied by an increase in the intercrystal pore ***,the resistivity decreases from 276 to 99μΩ·cm,coercivity increases from 162 to 293 Oe,and in-plane magnetic aniso-tropy *** the sputtering pressure decreases from 1.6 to 0.2 Pa,grain size significantly increases,resistivity significantly de-creases,and the coercivity significantly increases(from 67 to 280 Oe),which can be attributed to the increase in defect ***-pondingly,a quantitative model for the coercivity of Co thin films was *** polycrystalline films sputtered under pressures of 0.2 and 0.4 Pa exhibit significant in-plane magnetic anisotropy,which is primarily attributable to increased microstress.

关键词： cobalt thin film magnetron sputtering microstructure electromagnetic properties

基因多态性对比卡鲁胺药代动力学的影响并比较不同剂型比卡鲁胺的药代动力学特征

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中国临床药理学杂志 2018年第9期34卷 1056-1059页

作者：李媛媛王静王坤田芳代汉璐程龙妹张媛媛毕国放王晓芳王亮曲恒燕中国人民解放军第307医院临床药理学研究室北京100071 中国人民解放军第307医院药物临床试验机构北京100071

目的探讨腺苷三磷酸结合盒转运蛋白G2(ABCG2)和细胞色素P(CYP)3A4基因多态性对比卡鲁胺药代动力学的影响,比较比卡鲁胺的胶囊剂和片剂的药代动力学特性。方法健康男性受试者随机分为2组,分别单剂量口服受试药品或参比药品50 mg,用高效... 详细信息

目的探讨腺苷三磷酸结合盒转运蛋白G2(ABCG2)和细胞色素P(CYP)3A4基因多态性对比卡鲁胺药代动力学的影响,比较比卡鲁胺的胶囊剂和片剂的药代动力学特性。方法健康男性受试者随机分为2组,分别单剂量口服受试药品或参比药品50 mg,用高效液相色谱-质谱法测定血浆中比卡鲁胺的浓度,用Phoenix WinNonlin 6.4计算药代动力学参数,并进行生物等效性评价。用SPSS软件进行分析,考察基因多态性对比卡鲁胺药代动力学的影响。结果受试药品与参比药品比卡鲁胺的C_(max)分别为(900.00±159.20)和(902.40±146.10)ng·m L^(-1),t_(max)分别为(26.40±9.60)和(35.30±19.80)h,AUC_(0-t)分别为(1.96×10~5±3.28×10~4)和(2.02×10~5±4.84×10~4)ng·h·m L^(-1),AUC_(0-∞)分别为(2.03×10~5±3.62×10~4)和(2.11×10~5±5.63×10~4)ng·h·m L^(-1),C_(max)的90%置信区间为88.93%~111.39%;AUC_(0-t)的90%置信区间为85.97%~110.76%;AUC_(0-∞)的90%置信区间为85.18%~111.51%。28例受试者的ABCG2基因型之间的药代动力学参数进行方差分析和多重比较,CC型与AA、CA型比较,AUC_(0-t)之间差异有统计学意义(P<0.05);AUC_(0-∞)在CC型和AA型之间差异有统计学意义(P<0.05);CL/F在CC型和AA型之间差异有统计学意义(P<0.05)。结论两种制剂生物等效。ABCG2中CC型的AUC略低于AA型和CA型,而CC型的CL/F略高于AA型和CA型。

关键词：比卡鲁胺基因多态性高效液相色谱-质谱

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响应面法优化硫酸催化甘蔗糖蜜制备乙酰丙酸

精细化工 2018年第4期35卷 612-619页

作者：宋道君陆小芳徐勇军涂伟萍廖俊旭华南理工大学化学与化丁学院广东广州510641 东莞理工学院化学工程与能源技术学院广东东莞523808

以甘蔗糖蜜为原料、硫酸为催化剂,催化水解制备了乙酰丙酸（levulinic acid,LA）,以LA得率（水解液中LA占甘蔗糖蜜中转化糖的质量百分数,下同）为指标,在单因素实验基础上,考察了反应时间、甘蔗糖蜜的质量分数（占反应原料质量,下同）... 详细信息

以甘蔗糖蜜为原料、硫酸为催化剂,催化水解制备了乙酰丙酸（levulinic acid,LA）,以LA得率（水解液中LA占甘蔗糖蜜中转化糖的质量百分数,下同）为指标,在单因素实验基础上,考察了反应时间、甘蔗糖蜜的质量分数（占反应原料质量,下同）、甘蔗糖蜜与硫酸的质量比、反应温度的影响。采用Box-Benhnken中心组合实验原理和响应面分析法（RSM）对乙酰丙酸制备条件进行了优化。结果表明：建立的二次多项式模型回归性显著而失拟项不显著,模型拟合性良好。各因素对LA得率均有显著性影响,按影响程度从大到小依次为：甘蔗糖蜜与硫酸的质量比〉反应温度〉反应时间〉甘蔗糖蜜的质量分数。实验最终确定乙酰丙酸最佳制备条件为：反应时间5 h、w（甘蔗糖蜜）=40%、m（甘蔗糖蜜）/m（硫酸）=23.40、反应温度151℃。在该条件下进行了3次重复实验,LA得率平均值为30.11%,与预测值30.96%相对偏差0.85%,模拟可靠。

关键词：甘蔗糖蜜乙酰丙酸催化水解响应面分析中心组合实验

基于动脉自旋标记技术观察针刺对不同敏感度体质人群压痛阈影响的中枢效应

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针刺研究 2018年第5期43卷 319-325页

作者：马琳李学智付妮妮杨晓光席小芳刘菲任毅重庆医科大学中医药学院重庆400016 重庆市中医药防治代谢性疾病重点实验室重庆400016 湖北省襄阳市中心医院康复科湖北襄阳441000 陕西省汉中市中心医院康复科陕西汉中723000

目的:观察不同敏感度体质对针刺镇痛效应的影响,运用脑功能磁共振动脉自旋标记(fMRIASL)技术,观察不同体质影响针刺镇痛效应的脑区激活变化特征,探讨体质因素影响针刺效果的中枢响应机制。方法:按标准筛选对针刺不同敏感度受试者,分为... 详细信息

目的:观察不同敏感度体质对针刺镇痛效应的影响,运用脑功能磁共振动脉自旋标记(fMRIASL)技术,观察不同体质影响针刺镇痛效应的脑区激活变化特征,探讨体质因素影响针刺效果的中枢响应机制。方法:按标准筛选对针刺不同敏感度受试者,分为不敏感组20例和敏感组20例。针刺受试者左侧足三里穴,测定针刺前后两组受试者的体表压痛阈(PPT),比较两组针刺后的镇痛效应和PPT变化率;行脑功能磁共振ASL扫描,应用SPM 8、ASLtbx等软件对结果进行预处理,Pearson相关分析法分析局部脑血流(rCBF)与针感视觉模拟量尺(VAS)评分的相关性。结果:敏感组受试者的针感VAS评分显著高于不敏感组(P0.3,P<0.05)。结论:不同针刺敏感度体质是影响针刺镇痛效应的重要因素,敏感组针刺镇痛的疗效优于不敏感组,针刺可能使不同大脑功能区负激活而产生镇痛效应,内侧额上回、双侧前扣带回的负激活对敏感体质人群的针刺镇痛效应起到积极作用,这可能是针刺敏感体质人群针刺镇痛的中枢效应脑区之一。

关键词：针刺镇痛体质脑功能磁共振动脉自旋标记技术