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Differences and similarities in radial growth of Betula species to climate change

Journal of Forestry Research 2024年第2期35卷 176-187页

作者： Di Liu Yang An zhao Li zhihui Wang Yinghui zhao Xiaochun Wang Center for Ecological Research Key Laboratory of Sustainable Forest Ecosystem ManagementMinistry of EducationCollege of ForestryNortheast Forestry UniversityHarbin 150040People’s Republic of China Changan Park in Shijiazhuang Shijiazhuang 050000People’s Republic of China Shijiazhuang Landscape Greening Engineering Project Construction Center Shijiazhuang 050000People’s Republic of China Heilongjiang Institute of Meteorological Science Harbin 150030People’s Republic of China School of Life Qufu Normal UniversityQufu 273100People’s Republic of China

Betula platyphylla and Betula costata are important species in mixed broadleaved-Korean pine(Pinus koraiensis)forests.However,the specific ways in which their growth is affected by warm temperatures and drought remain unclear.To address this issue,60 and 62 tree-ring cores of B.platyphylla and B.costata were collected in Yichun,China.Using dendrochronological methods,the response and adaptation of these species to climate change were examined.A“hysteresis effect”was found in the rings of both species,linked to May–September moisture conditions of the previous year.Radial growth of B.costata was positively correlated with the standardized precipitation-evapotranspiration index(SPEI),the precipitation from September to October of the previous year,and the relative humidity in October of the previous year.Growth of B.costata is primarily restricted by moisture conditions from September to October.In contrast,B.platyphylla growth is mainly limited by minimum temperatures in May–June of both the previous and current years.After droughts,B.platyphylla had a faster recovery rate compared to B.costata.In the context of rising temperatures since 1980,the correlation between B.platyphylla growth and monthly SPEI became positive and strengthened over time,while the growth of B.costata showed no conspicuous change.Our findings suggest that the growth of B.platyphylla is already affected by warming temperatures,whereas B.costata may become limited if warming continues or intensifies.Climate change could disrupt the succession of these species,possibly accelerating the succession of pioneer species.The results of this research are of great significance for understanding how the growth changes of birch species under warming and drying conditions,and contribute to understanding the structural adaptation of mixed broadleaved-Korean pine(Pinus koraiensis)forests under climate change.

关键词： Tree rings Betula platyphylla Betula costata Climate response Moving correlation Extreme drought

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Ferrihydrite transformation impacted by coprecipitation of lignin:Inhibition or facilitation?

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Journal of Environmental Sciences 2024年第5期139卷 23-33页

作者： Lin Liu zhihui Yang Weichun Yang Wen Jiang Qi Liao Mengying Si Feiping zhao School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution(CNERC-CTHMP) Changsha 410083China

Lignin is a common soil organic matter that is present in soils,but its effect on the transformation of ferrihydrite(Fh)remains unclear.Organic matter is generally assumed to inhibit Fh transformation.However,lignin can reduce Fh to Fe(Ⅱ),in which Fe(Ⅱ)-catalyzed Fh transformation occurs.Herein,the effects of lignin on Fh transformation were investigated at 75℃ as a function of the lignin/Fh mass ratio(0-0.2),pH(4-8)and aging time(0-96 hr).The results of Fh-lignin samples(mass ratios=0.1)aged at different pH values showed that for Fh-lignin the time of Fh transformation into secondary crystalline minerals was significantly shortened at pH 6 when compared with pure Fh,and the Fe(Ⅱ)-accelerated transformation of Fh was strongly dependent on pH.Under pH 6,at low lignin/Fh mass ratios(0.05-0.1),the time of secondary mineral formation decreased with increasing lignin content.For high lignosulfonate-content material(lignin:Fh=0.2),Fh did not transform into secondary minerals,indicating that lignin content plays a major role in Fh transformation.In addition,lignin affected the pathway of Fh transformation by inhibiting goethite formation and facilitating hematite formation.The effect of coprecipitation of lignin on Fh transformation should be useful in understanding the complex iron and carbon cycles in a soil environment.

关键词： Ferrihydrite transformation Lignin Hematite Goethite Fe(Ⅱ)-catalyzed Reactive Fe(Ⅲ)species

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Review of the research on the development and utilization of clay-type lithium resources

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Particuology 2024年第4期87卷 46-53页

作者： Ruiqi Xie zhihui zhao Xiong Tong Xian Xie Qiang Song Peiqiang Fan Faculty of Land Resource Engineering Kunming University of Science and TechnologyKunming650093China Yunnan Engineering Research Center for Metal Tailings Resource Utilization Kunming650093China

Since the demands for lithium have been in explosive growth recently and several great clay lithium resources were founded in China,the development and utilization of clay-type lithium resources become a hot topic.In order to provide a guidance for the concentration and extracting lithium of clay-type lithium resources,this review systematically summarized the main types and characteristics of clay-type lithium resources and the research status of lithium extraction from clay lithium resources.Meanwhile,the flotation research status of the main mineral of clay lithium ore was also summarized.Furthermore,we discussed the difficulties in the development and utilization of clay-type lithium ore and put forward the subsequent research orientation.This paper can provide a guidance for the con-centration and extracting lithium of clay-type lithium resources in the future.

关键词： Clay lithium Clay mineral flotation Lithium extraction Leaching

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Facile preparation and efficient MnxCoy porous nanosheets for the sustainable catalytic process of soot

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Green Energy & Environment 2024年第3期9卷 516-528页

作者： Miaomiao Hu Kun Zhou Tingyi zhao Zheng Li Xianhai Zeng Di Yu Xuehua Yu Mingqin zhao zhihui Shao Qixiang Xu Bing Cui Flavors and Fragrance Engineering&Technology Research Center of Henan Province College of Tobacco ScienceHenan Agricultural UniversityZhengzhou450002China School of Ecology and Environment Zhengzhou UniversityZhengzhou450001China College of Energy Xiamen UniversityXiamen361102China College of Chemistry and Chemical Engineering Shenyang Normal UniversityShenyang110034China

The pursuit of high-performance is worth considerable effort in catalysis for energy efficiency and environmental sustainability. To develop redox catalysts with superior performance for soot combustion, a series of Mn_(x)Co_(y) oxides were synthesized using MgO template substitution.This method greatly improves the preparation and catalytic efficiency and is more in line with the current theme of green catalysts and sustainable development. The resulting Mn_(1)Co_(2.3) has a strong activation capability of gaseous oxygen due to a high concentration of Co^(3+) and Mn^(3+). The Mn doping enhanced the intrinsic activity by prompting oxygen vacancy formation and gaseous oxygen adsorption. The nanosheet morphology with abundant mesoporous significantly increased the solid–solid contact efficiency and improved the adsorption capability of gaseous reactants. The novel design of Mn_(1)Co_(2.3)oxide enhanced its catalytic performance through a synergistic effect of Mn doping and the porous nanosheet morphology, showing significant potential for the preparation of high-performance soot combustion catalysts.

关键词： Soot combustion Intrinsic activity Contact efficiency Mn doping DFT

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Effects of phosphorylated ovalbumin on the quality of pork myofibrillar protein gel:an insight into gelling and physicochemical properties

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Journal of Future Foods 2024年第2期4卷 149-158页

作者： zhihui Yu Yating Gao Meng Wu Chaofan zhao Xiubin Liu Xiaoyu Zhang Lixin Zhang Yisheng Chen College of Food Science and Engineering Shanxi Agricultural UniversityTaigu 030801China College of Animal Science and Technology Hunan Agricultural UniversityChangsha 410128China Houji Laboratory in Shanxi Province Shanxi Agricultural UniversityTaiyuan 030031China

This study aimed to investigate the effects of phosphorylated-ovalbumin(P-OVA)at different concentrations(0.5%and 1.0%)on the gel properties of pork myofibrillar protein(MP).The results showed that the textural properties such as gel hardness,cohesiveness,springiness and chewiness were improved with P-OVA addition at 0.5%.The water holding capacity(up to 75.89%)and gel strength(up to 168.56 g·mm)of MP gel were markedly increased after P-OVA addition.The absolute value of zeta potential reached 13.85 mV and maximum hydrophobicity(15.2μg)resulted from the addition of 0.5%P-OVA.The storage modulus(G’)and loss modulus(G’’)of MP gel were significantly increased from 50°C,and the G’and G’’significantly increased after 1.0%P-OVA addition,evidencing that the cross-linking effect of MP protein gel was enhanced.In addition,the P-OVA addition improved the structure of MP gel protein by reducing theα-helix,while increasing theβ-sheet and the r-value(the ratio between two ultraviolet second-derivative peak-to-trough distances),which further promoted the uniform and compact gel network structure.This work demonstrated that P-OVA is a highly effective modifier that significantly improves the quality of MP gel.From a view of practice,0.5%P-OVA is the optimal addition amount.

关键词： Phosphorylated ovalbumin Myofibrillar proteins Gel properties Structures

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Puerariae Radix protects against ulcerative colitis in mice by inhibiting NLRP3 inflammasome activation

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Food Science and Human Wellness 2024年第4期13卷 2266-2276页

作者： Yu Ga Yuanyuan Wei Qingyu zhao Yimeng Fan Yannan Zhang Zhifang Zhang Sijia Hao Lixia Wang Zhifen Wang Jinlong Han Shuang Wu zhihui Hao Innovation Centre of Chinese Veterinary Medicine College of Veterinary MedicineChina Agricultural UniversityBeijing 100086China National Center of Technology Innovation for Medicinal Function of Food National Food and Strategic Reserves AdministrationBeijing 100193China Inner Mongolia Medical University Hohhot 010059China China Agricultural University Yantai Institute Yantai 264670China Shandong Academy of Agricultural Sciences Jinan 250100China

Ulcerative colitis(UC)is a common inflammatory disease of the gastrointestinal tract.Traditional Chinese medicine(TCM)has long been used in Asia as a treatment for UC and Puerariae Radix(PR)is a reliable anti-diarrheal therapy.The aims of this study were to investigate the protective effect of PR using the dextran sulfate sodium salt(DSS)-induced UC model in mice and identify molecular mechanisms of PR action.The chemical constituents of PR via ultra-performance liquid chromatography/tandem mass spectrometry and identified potential PR and UC targets using a network pharmacology(NP)approach were obtained to guide mouse experiments.A total of 180 peaks were identified from PR including 48 flavonoids,46 organic acids,14 amino acids,8 phenols,8 carbohydrates,7 alkaloids,6 coumarins and 43 other constituents.NP results showed that caspase-1 was the most dysregulated of the core genes associated with UC.A PR dose of 0.136 mg/g administered to DSS treated mice reversed weight loss and decreased colon lengths found in UC mice.PR also alleviated intestinal mucosal shedding,inflammatory cell infiltration and mucin loss.PR treatment suppressed upregulation of NOD-like receptor protein 3(NLRP3),cysteinyl aspartate-specific proteases-1(caspase-1),apoptosis-associated speck-like(ASC)and gasdermin D(GSDMD)at both the protein and m RNA expression levels.The addition of a small molecule dual-specificity phosphatase inhibitor NSC 95397 inhibited the positive effects of PR.These results indicated that PR exerts a protective effect on DSS-induced colitis by inhibiting NLRP3 inflammasome activation in mice.

关键词： Puerariae Radix Ulcerative colitis Molecular mechanisms Pyroptosis NOD-like receptor protein 3 inflammasome

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Convolutional Neural Networks of Whole Jujube Fruits Prediction Model Based on Multi-Spectral Imaging Method

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Chinese Journal of Electronics 2023年第3期32卷 655-662页

作者： WANG Jing FAN Xiaofei SHI Nan zhao zhihui SUN Lei SUO Xuesong College of Mechanical and Electrical Engineering Hebei Agricultural University Key Laboratory of Microbial Diversity Research and Application of Hebei Province College of Life Sciences Hebei University Research Center of Chinese Jujube Hebei Agricultural University

Soluble sugar is an important index to determine the quality of jujube, and also an important factor to influence the taste of jujube. The acquisition of the soluble sugar content of jujube mainly relies on manual chemical measurement which is time-consuming and labor-intensive. In this study, the feasibility of multispectral imaging combined with deep learning for rapid nondestructive testing of fruit internal quality was analyzed. Support vector machine regression model, partial least squares regression model, and convolutional neural networks(CNNs) model were established by multispectral imaging method to predict the soluble sugar content of the whole jujube fruit, and the optimal model was selected to predict the content of three kinds of soluble sugar. The study showed that the sucrose prediction model of the whole jujube had the best performance after CNNs training, and the correlation coefficient of verification set was 0.88, which proved the feasibility of using CNNs for prediction of the soluble sugar content of jujube fruits.

关键词： Jujube Multi-spectral imaging Convolutional neural networks

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基于控保协同的有源配网主动注入式保护方法

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电力系统保护与控制 2024年第3期52卷 94-103页

作者：戴志辉吴桐何静远赵謇河北省分布式储能与微网实验室(华北电力大学) 河北保定071003

由于逆变型分布式电源(inverter-interfaced distributed generation,IIDG)的故障特性主要由其控制策略及电网故障情况决定,在不同故障场景和工况下,传统的被动式保护方法存在保护整定和协调困难的问题。为此,提出一种基于控保协同的有... 详细信息

由于逆变型分布式电源(inverter-interfaced distributed generation,IIDG)的故障特性主要由其控制策略及电网故障情况决定,在不同故障场景和工况下,传统的被动式保护方法存在保护整定和协调困难的问题。为此,提出一种基于控保协同的有源配网主动注入式保护方法,故障期间控制IIDG主动向电网注入特征信号,保护处利用检测到的特征信号来获取IIDG的基波信息,从而消除IIDG对各支路电流及现有电流保护的影响。由于保护利用的故障特征是由IIDG主动注入的,因此该方法在不同场景和工况下都有较好的适用性,且不需要增加额外的通信和检测设备,具有经济性好和实用性高的优点。仿真结果验证了所提方法的有效性。

关键词：逆变型分布式电源主动注入式保护控保协同有源配网协调控制

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库仑滴定法快速测定烟用香精的酸值

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烟草科技 2024年第3期57卷 28-33页

作者：叶志晖赵晓忠王宏铝浙江中烟工业有限责任公司杭州市310000

为建立库仑滴定法测定烟用香精的酸值,采取铂电极-铂丝电极为电解电极对,锑电极-饱和甘汞电极为指示电极对,以0.5 mol/L氯化钾溶液为电解质,利用电解生成的OH~-与样品中游离酸进行中和反应,滴定溶液pH至8.0,通过电解滴定至终点的时间,... 详细信息

为建立库仑滴定法测定烟用香精的酸值,采取铂电极-铂丝电极为电解电极对,锑电极-饱和甘汞电极为指示电极对,以0.5 mol/L氯化钾溶液为电解质,利用电解生成的OH~-与样品中游离酸进行中和反应,滴定溶液pH至8.0,通过电解滴定至终点的时间,按照法拉第电解定律计算得到烟用香精的酸值;并进行加标回收率实验。结果表明:(1)该方法的回收率范围为96.50%~102.47%,重复性实验结果的相对标准偏差均低于1.4%。(2)应用该方法测得20种香精样品的酸值与烟草行业标准规定的电位滴定法无显著性差异。(3)该方法操作便捷,耗时较短,结果精密度与准确度较好,适用于实际生产中产品的质量检测。

关键词：烟用香精库仑滴定法酸值快速测定

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导叶端隙密封结构对可调涡轮性能的影响

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航空动力学报 2024年第3期39卷 205-213页

作者：王智慧马朝臣刘晓娟赵芮晋中学院机械学院山西晋中030619 北京理工大学机械与车辆学院北京100081

基于传统可调涡轮导叶,设计了一种带有端隙密封结构的喷嘴环导叶(end-clearance sealed guide vane, ESGV)。在导叶不同开度下,对ESGV可调涡轮进行数值模拟,分析了ESGV对可调涡轮性能的影响,结果表明:ESGV可以有效的抑制导叶端隙泄漏流... 详细信息

基于传统可调涡轮导叶,设计了一种带有端隙密封结构的喷嘴环导叶(end-clearance sealed guide vane, ESGV)。在导叶不同开度下,对ESGV可调涡轮进行数值模拟,分析了ESGV对可调涡轮性能的影响,结果表明:ESGV可以有效的抑制导叶端隙泄漏流,能够明显改善喷嘴环和转子通道的流动状态,进而提高涡轮效率。对ESGV可调涡轮和原始涡轮进行涡轮特性试验,结果显示:两型涡轮流量特性大致相同时,在导叶中开度下,ESGV涡轮效率较原始涡轮提高了5%,验证了ESGV方案的有效性。

关键词：带有端隙密封结构的喷嘴环导叶(ESGV) 可调径向涡轮间隙泄漏流涡轮性能泄漏损失

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