Tianjin Normal University Research Articles

Determination of dark matter distribution in Ursa Major III and constraints on dark matter annihilation* *Supported by the National Natural Science Foundation of China (11947005, 12175248, 12205388, 12227804), the Science & Technology Development Fund of Tianjin Education Commission for Higher Education (2020KJ003), and the PhD Research Startup Foundation of Tianjin Normal University (52XB1912)

The recently discovered satellite dwarf galaxy Ursa Major III provides a promising opportunity to explore the signatures resulting from dark matter (DM) annihilation owing to its proximity and large J-factor. Given the absence of an excess of γ-ray signatures originating from Ursa Major III, observations of γ-rays, such as those from Fermi-LAT, can be utilized to set constraints on the DM annihilation cross-section. In this study, we determined the DM density profile and considered the relationship between DM density and velocity dispersion at different locations within Ursa Major III through Jeans analysis. We calculated the J-factor of Ursa Major III for s-wave annihilation along with the effective J-factors for p-wave and Sommerfeld enhanced annihilation scenarios. Employing these derived J-factors, we set stringent constraints on DM annihilation cross-sections in three scenarios. Given the substantial impact of member star identification on the J-factor of Ursa Major III, we further calculated J-factors under the exclusion of the largest velocity outlier. Our analysis reveals a notable reduction in the median value and an increase in the deviation of J-factors, thereby leading to considerably weaker constraints.

Mental Health Status and Countermeasures of College Students in the Mainland and Hong Kong in the Post-epidemic Era

The study focuses on investigating the mental health status and implementing educational countermeasures among college students in Tianjin Normal University (TJNU) and The Education University of Hong Kong (EdUHK) during the post-epidemic era. This study holds significant importance as It aims to provide a comprehensive understanding of the mental well-being of college students in these regions and identify effective strategies and interventions to address their mental health needs. To accomplish the thesis objectives, an interpretive thesis methodology has been employed in this dissertation. Educational institutions in Mainland China and Hong Kong should prioritize mental health education and equip students with the necessary knowledge, skills, and support systems to enhance their mental well-being. Establishing comprehensive mental health programs, counseling services, and accessible helplines are essential. Moreover, it is crucial to raise awareness, reduce stigma, and foster a supportive environment that encourages open dialogue and emotional well-being among college students.

TransCloudSeg: Ground-Based Cloud Image Segmentation With Transformer

Cloud image segmentation plays an important role in ground-based cloud observation. Recently, most existing methods for ground-based cloud image segmentation learn feature representations using the convolutional neural network (CNN), which results in the loss of global information because of the limited receptive field size of the filters in the CNN. In this article, we propose a novel deep model named TransCloudSeg, which makes full use of the advantages of the CNN and transformer to extract detailed information and global contextual information for ground-based cloud image segmentation. Specifically, TransCloudSeg hybridizes the CNN and transformer as the encoders to obtain different features. To recover and fuse the feature maps from the encoders, we design the CNN decoder and the transformer decoder for TransCloudSeg. After obtaining two sets of feature maps from two different decoders, we propose the heterogeneous fusion module to effectively fuse the heterogeneous feature maps by applying the self-attention mechanism. We conduct a series of experiments on Tianjin Normal University large-scale cloud detection database and Tianjin Normal University cloud detection database, and the results show that our method achieves a better performance than other state-of-the-art methods, thus proving the effectiveness of the proposed TransCloudSeg.

Ground-Based Cloud Detection Using Multiscale Attention Convolutional Neural Network

Cloud detection plays a significant role in ground-based remote sensing observation, and it is quite challenging due to the variations in illumination and cloud form, and the vague boundaries between cloud and sky. In this letter, we propose a novel deep model named multiscale attention convolutional neural network (MACNN) for ground-based cloud detection, which possesses a symmetric encoder–decoder structure. For accurate cloud detection, we design the multiscale module in MACNN to obtain different receptive fields by using different hole rates for the filters, and meanwhile, we propose the attention module in MACNN to learn the attention coefficients in order to reflect different importance of pixels. Furthermore, we release the Tianjin Normal University (TJNU) cloud detection database (TCDD) to provide a comparative study for different methods, and to the best of our knowledge, it is the largest cloud detection database. We conduct a series of experiments on the TCDD, and the experimental results demonstrate that the proposed MACNN outperforms state-of-the-art methods in five quantitative evaluation criteria.

Estimation of Organic Pollution of the Jinyaoshi Lake Based on the Diatom Assemblage of the Lake Sediments

From 2015 to 2019, samples of surface mud from the bottom of the artificial lake in Tianjin Normal University were collected for diatom analysis and identification in May and June. 1296 diatoms were identified and divided into 25 species. DAIpo (Diatom Assemblage Index to organic water pollution) was calculated: 56 in 2015, 76 in 2017, 58 in 2018 and 63 in 2019. In 2017, it was β-oligosaprobic, and in 2015, 2018 and 2019, it belonged to α-oligosaprobic. The Jinyaoshi Lake is an artificial lake where groundwater is exposed by artificial excavation, and its water source mainly comes from groundwater, then by precipitation. It shows that the pollution degree of the Jinyaoshi Lake was not serious since 2015, and its pollution level was α or β-oligosaprobic.

Nearby dark matter subhalo that accounts for the DAMPE excess * * Supported by the foundation of Tianjin Normal University (52XB1912), the National Key R&D Program of China (2016YFA0400200) and the National Natural Science Foundation of China (U1738209, 11851303)

The precise spectrum of electrons and positrons at high energies plays an important role in understanding their origin. DArk Matter Particle Explorer has reported their first measurement of the spectrum from 25 GeV to 4.6 TeV. This spectrum reveals a tentative peak at ~1.4 TeV, which requires a nearby source of . In this work, we study the properties of a large nearby dark matter subhalo that accouns for this spectral peak, such as its mass and distance from Earth, for different concentration models. We compare spectra of the sources in 3FGL with that from DM annihilation in the subhalo, and find ten candidates that have comparable gamma-ray spectra. However, according to the N-body simulation, the probability that such a large subhalo is close enough to Earth is less than 0.1%.

The Role of Interpersonal Problems and Family Environment in the Association Between Impulsivity and Suicidal Ideation: A Moderate Mediation Model.

Impulsivity, interpersonal problems, and family environment are important factors in the development of suicidal ideation, but the pathway of these factors on suicidal ideation is not clear. This study constructed a moderated mediation model to examine whether interpersonal problems mediated the relationship between impulsivity and suicidal ideation and whether this mediating process was moderated by family environment. For this purpose, 902 college students from Tianjin Normal University located in the north of China were recruited to participate in this study with Barratt Impulsiveness Scale, Adolescent Self-Rating Life Events Check List, Family Environment Scale, and Beck Scale for Suicidal Ideation. Impulsivity could significantly predict suicidal ideation, and the relationship between impulsivity and suicidal ideation was significantly mediated by interpersonal problems; furthermore, the mediating effect and the directing effect were significantly moderated by family environment. These findings contribute to our understanding of a comprehensive interpretation of both environmental and individual factors' impacts on suicidal ideation.

Water‐Mediated Structural Transformations of CuII 5‐Halonicotinates Coordination Networks with Distinct Mechanisms

AbstractInvited for the cover of this issue is the group of Miao Du at Tianjin Normal University. The image depicts the structural transformation of a dynamic coordination network. Read the full text of the article at 10.1002/chem.201702405.

Synthesis of diamonds in Fe–C systems using nitrogen and hydrogen co-doped impurities under HPHT**Project supported by the National Natural Science Foundation of China (Grant Nos. 11504267, 11504269, and 51172089), the Open Project of State Key Laboratory of Superhard Materials, Jilin University, China (Grant No. 201504), and the Doctoral Fund of Tianjin Normal University, China (Grant No. 52XB1518).

In this study, we investigate the effect of nitrogen and hydrogen impurities on colors, morphologies, impurity structures and synthesis conditions of diamond crystals in Fe–C systems with C3N6H6 additives at pressures in the range 5.0–6.5 GPa and temperatures of 1400–1700 °C in detail. Our results reveal that the octahedron diamond nucleation in a Fe–C system is evidently inhibited by co-doped N–H elements, thereby resulting in the increase of minimum pressure and temperature of diamond synthesis by spontaneous nucleation. The octahedron diamond crystals synthesized from a pure Fe–C system are colorless, while they become green in the system with C3N6H6 additive. The surface defects of diamond will deteriorate when the nitrogen and hydrogen atoms simultaneously incorporate in the diamond growth environment in the Fe–C system. We believe that this study will provide some important information and be beneficial for the deep understanding of the crystallization of diamonds from different component systems.

Erratum to: 53BP1 depletion causes PARP inhibitor resistance in ATM-deficient breast cancer cells.

Author details Department of Medical Oncology, Cancer Institute and Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China. Department of Medical Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China. State Key Laboratory of Molecular Oncology, Cancer Institute and Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China. College of Life Science/Tianjin Key Laboratory of Cyto-Genetical and Molecular Regulation, Tianjin Normal University, Tianjin 300387, China.

Security in big data

Security in big data

内蒙古高原西部荒漠区四种锦鸡儿属植物水力结构变化的比较研究

PDF HTML阅读 XML下载 导出引用 引用提醒 内蒙古高原西部荒漠区四种锦鸡儿属植物水力结构变化的比较研究 DOI: 10.5846/stxb201306041317 作者: 作者单位: 天津师范大学,天津师范大学,天津师范大学 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（面上项目，重点项目，重大项目） Variation in hydraulic architecture of four Caragana species in the desert region on the Inner Mongolian Plateau Author: Affiliation: Tianjin Normal University,Tianjin Normal University,Tianjin Normal University Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:本文采用改良的冲洗法，比较了内蒙古高原西部荒漠区锦鸡儿属(Caragana) 4 种优势植物—柠条锦鸡儿（C. korshinsk）、狭叶锦鸡儿（C. stenophylla）、垫状锦鸡儿（C. tibetica）和荒漠锦鸡儿（C. roborovoskyi）的水力结构日变化和季节变化，目的是了解4种锦鸡儿属植物对荒漠区环境的适应性及其差异。研究发现：4种锦鸡儿属植物的比导率、叶比导率均为早晚高、中午低的单谷日变化曲线；三个季节相比较，夏季的比导率、叶比导率最大；胡伯尔值春季>夏季>秋季。三个季节比导水率日平均值、夏季和秋季的叶比导率、三个季节的胡伯尔值都表现为：柠条锦鸡儿>荒漠锦鸡儿>狭叶锦鸡儿>垫状锦鸡儿；三个季节比导水率日变幅和春季叶比导率表现为：柠条锦鸡儿>荒漠锦鸡儿>垫状锦鸡儿>狭叶锦鸡儿。4个种比导水率日平均值的季节变幅相似。这些结果表明：（1）荒漠区锦鸡儿属植物的水力结构限制了水分运输，使其避免了中午的高蒸腾。（2）荒漠区锦鸡儿属植物通过较高的水分运输效率及较好的叶供水效率适应夏季的高温和强辐射，维持水分平衡；锦鸡儿属植物胡伯尔值的季节变化保证了其在春、夏季快速生长期有较好的水分供应。（3）较高的比导率、叶比导率和胡伯尔值导致了柠条锦鸡儿良好的水分供应和高蒸腾速率，进而导致了柠条锦鸡儿较快的生长速度，这说明柠条锦鸡儿对荒漠环境的适应性好于其它三个种；柠条锦鸡儿的输水效率高，但易发生严重的空穴和栓塞。 Abstract:Caragana species are able to survive in the stressful climatic conditions (e.g. very limited precipitation, high temperature and strong solar radiation) within the desert region on the Inner Mongolian Plateau through ecological adaptations to the environment. In the desert region, precipitation has the most important influence on plant growth and development. In order to understand how Caragana species are adapted to the arid desert environment, we investigated daily and seasonal variation in the hydraulic architecture (specific conductivity, leaf specific conductivity and Huber value) of four dominant Caragana species (Caragana korshinskii, C. stenophylla, C. tibetica and C. roborovsky), which grow in the desert region on the Inner Mongolian Plateau. We examined the hydraulic architecture of these Caragana species using the improved flushing method. The results showed that there was significant daily and seasonal variation in the hydraulic architecture of the four Caragana species. For all four Caragana species, the specific conductivity and leaf specific conductivity were high in the morning and afternoon and low at noon, showing a curve with single valley. Specific conductivity and leaf specific conductivity were highest in the summer, while Huber values were highest in spring, lower in summer, and lowest in autumn. There was also significant interspecific variation in hydraulic architecture among the four Caragana species. For daily averages of specific conductivity in the three seasons, leaf specific conductivity in summer and autumn, and Huber value in the three seasons, our results followed the pattern : C. korshinski > C. roborovoskyi > C. tibetica > C. stenophylla. For diurnal variation extent of specific conductivity in the three seasons, and leaf specific conductivity in the spring, our results followed the pattern: C. korshinski > C. roborovoskyi > C. stenophylla > C. tibetica. Seasonal variation extent of the daily average of specific conductivity was similar among the four Caragana species. Based on our results, we drew the following conclusions: (1) The hydraulic architecture of the four desert Caragana species limited water transport, which might decrease transpiration at noon. (2) Caragana species might be adapted to high temperatures and strong solar radiation through high water transport efficiency and better water supply to leaves to maintain relatively stable water status. The seasonal variation in Huber values ensured better water supplies to the four Caragana species in the spring and summer, when these species grew relatively rapidly. (3) Among the four Caragana species, C. korshinskii had the highest specific conductivity, leaf specific conductivity and Huber values, resulting in better water supply and higher transpiration rates, and thereby faster growth rates, which suggests that C. korshinskii is better adapted to the desert environment than the other three Caragana species. However, although C. korshinskii had higher water transpiration efficiency, this species was more prone to having serious cavitation and embolism. 参考文献 相似文献 引证文献

ChemInform Abstract: Structural Design of Coordination Polymers

a College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, MOE Key Laboratory of Inorganic–Organic Hybrid Functional Material Chemistry, Tianjin Normal University, Tianjin 300387, China. E-mail: dumiao@public.tpt.tj.cn National Chemical Laboratory, Physical Chemistry Division, Dr. Homi Bhabha Road, Pune, 411008, India c University of Calgary, Department of Chemistry, 2500 University Drive NW, Alberta, Calgary, T2N 1N4, Canada

Structural design of coordination polymers

a College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, MOE Key Laboratory of Inorganic–Organic Hybrid Functional Material Chemistry, Tianjin Normal University, Tianjin 300387, China. E-mail: dumiao@public.tpt.tj.cn National Chemical Laboratory, Physical Chemistry Division, Dr. Homi Bhabha Road, Pune, 411008, India c University of Calgary, Department of Chemistry, 2500 University Drive NW, Alberta, Calgary, T2N 1N4, Canada

碱性土壤盐化过程中阴离子对土壤中镉有效态和植物吸收镉的影响

PDF HTML阅读 XML下载 导出引用 引用提醒 碱性土壤盐化过程中阴离子对土壤中镉有效态和植物吸收镉的影响 DOI: 10.5846/stxb201112251968 作者: 作者单位: 天津师范大学城市与环境科学学院,300387,天津师范大学城市与环境科学学院,300387,天津师范大学城市与环境科学学院,300387,天津师范大学城市与环境科学学院,300387 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金(40973078,40830746); 973计划前期研究专项(2010CB434806); 天津市科技计划项目(10SYSYJC27400) Impact of inorganic anions on the cadmium effective fraction in soil and its phytoavailability during salinization in alkaline soils Author: Affiliation: College of Urban and Environment Science,Tianjin Normal University,,, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:镉是土壤环境中对土壤质量有着极其重要影响的污染物之一,低含量下就能对人体和动物产生危害。镉在土壤中的有效态既决定了它的生物有效性及对环境的危害程度,又是人们对受污染土壤进行治理和修复的基础。作为盐化土壤中的典型组分,无机盐不可避免对镉的有效态及生物有效性等地球化学行为产生明显影响。研究了碱性土壤盐化过程中无机盐阴离子对土壤中镉有效态和植物吸收镉影响。研究方法为:以钠盐为例,实验研究了碱性土壤盐化过程中无机盐阴离子对土壤中镉有效态的影响;通过油菜种植试验,分析了无机盐阴离子对土壤中镉生物有效性的影响。研究结果表明,土壤盐化过程中,土壤溶液中Cl-浓度较低时,土壤中镉的有效态含量随Cl-浓度增加而增大,但当土壤中Cl-/Cd 的比值大于100∶1时,土壤中镉的有效态含量达到最大值。土壤溶液中SO42-含量对土壤中镉有效态含量的影响不明显;随着土壤溶液中HCO3-含量的增加,土壤中镉的有效态含量明显减少。由于Cl-、SO42-是土壤溶液中的主要成分,随着盐度的增加,镉的有效态含量增加。油菜种植试验显示,当土壤中Cl-的含量增加时,土壤中镉的有效态含量增加,有利于植物对镉的吸收,因此油菜中镉的含量随土壤中Cl-的含量增加而增加,但当土壤有效态含量超过2 mg/kg后,油菜吸收镉已经达到最大。随着土壤溶液中SO42-浓度的增加,油菜中镉含量基本不变;土壤溶液中HCO3-的含量增加,植物中镉的含量随土壤中HCO3-含量增加而减少。这些特征与土壤镉有效态变化相吻合。通过各种措施控制土壤盐度和调节阴离子类型和含量,有利于降低土壤中镉的有效态含量,减轻镉的活化;农业生产中适当调整无机肥料的种类,可以减少农作物对镉的吸收。 Abstract:Cadmium (Cd) is one of the main heavy metal pollutants in the soil environment. It has an important influence on soil quality and can cause harm to humans and animals at low concentrations. The Cd effective fraction (dissolved + exchangeable) in soil is important in determining its bioavailability and harmful levels in the soil environment, but it is also the foundation of contaminated soil treatment and remediation. There are many soil factors which influence concentrations of the Cd effective fraction. As a typical component of salinization in soil, inorganic salts inevitably have an obvious impact on the geochemical behavior of Cd in soil such as Cd fractions and their bioavailability. In this paper, the impact of inorganic salt anions such as Cl-, SO42- and HCO3- on the concentrations of the Cd effective fraction in soil and its phytoavailability was studied in order to understand the influence of inorganic salts on Cd geochemistry during the process of salinization in alkaline soils. Using sodium salts as the example, the impact of inorganic anions such as Cl-, SO42- and HCO3- on concentrations of the Cd effective fraction was studied experimentally and the impact of inorganic anions on Cd phytoavailability was studied in a rape cultivation experiment. The Cd effective fraction in soil was extracted using the Tessilar method, and concentrations of the Cd effective fraction in soil and Cd concentrations in rape were measured by Inductively Coupled Plasma Mass Spectrometry. The experiments investigating the impact of inorganic anions on the cadmium effective fraction showed that concentrations of the Cd effective fraction in soil increased with increasing Cl- concentration in soil solutions and reached a maximum when the concentration ratio of Cl-/Cd exceeded 100:1. For SO42-, no obvious effect was observed on the concentrations of Cd effective fraction, while increasing HCO3- concentration in soil solutions significantly reduced concentrations of the Cd effective fraction. The rape cultivation experiments showed that Cd concentrations in rape increased with increasing concentrations of the Cd effective fraction. The impact of the inorganic Cl-, SO42- and HCO3- anions on concentrations of the Cd effective fraction were reflected by Cd uptake by rape, with Cd concentrations in rape increasing with increasing Cl- concentrations in the soil solution, reaching a maximum when the concentration of the Cd effective fraction exceeded 2 mg/kg. When SO42- concentrations in the soil solution increased, no change was observed in Cd concentrations in rape, which is in agreement with the lack of changes in concentrations of the Cd effective fraction in soil observed with increasing SO42- concentrations. Cd concentrations in rape reduced with increasing HCO3- concentrations in the soil solution which was consistent with the phenomenon that a significant reduction occurred in concentrations of the Cd effective fraction with increasing HCO3- concentrations in soil solutions. It suggests that Cd phytoavailability, as well as concentrations of the Cd effective fraction during salinization, are influenced by inorganic anions such as Cl-, SO42- and HCO3- in the soil solution. Concentrations of the Cd effective soil fraction can be controlled by adjusting contaminated soil salinity and inorganic anion types with various measures. Cd uptake by crops can be reduced by using appropriate inorganic fertilizer types in agricultural production. 参考文献 相似文献 引证文献

1,4-Dihydro-3,6-dipyrazin-2-yl-1,2,4,5-tetrazine–benzene-1,3-dicarboxylic acid (1/1). Retraction

In November 2006, we (Ji-Lin Lu, Da-Shun Zhang, Lin Li and Bei-Ping Liu) published a paper on the crystal structure of 1,4-dihydro-3,6-dipyrazin-2-yl-1,2,4,5-tetra­zine–benzene-1,3-dicarboxylic acid (1/1) [Acta Cryst. (2006), E62, o4855–o4857]. The synthesis and characterization of the compound, the X-ray data collection, crystal structure solution and refinement were carried out in the laboratory of Professor Miao Du, Tianjin Normal University, People's Republic of China. We obtained this crystallographic information from his student and published the paper without Professor Du's permission. We now retract this paper and offer our sincere apologies to Professor Du.

Comparative Literature & Comparative Culture Institute of Tianjin Normal University

"Comparative Literature & Comparative Culture Institute of Tianjin Normal University." Comparative Literature: East & West, 4(1), pp. 172–173

My Way into Women's Studies

Back at home following a lot of consultations discussions and arguments the theme of the seminar emerged as follows: Women and Development -Status Health and Employment. I gradually became aware of the mainstream in the worlds womens movements as preparations were underway for the Fourth UN World Conference on Women to be held in China. Three UN conferences on women had been held already but we didnt know that Equality Development and Peace were the aims of the womens movements until 20 years after they had been set. That was why I connected the themes development and health with Chinese women for the seminar. The time was then ripe: Deng Xiaopings speeches during his inspection tour in south China had brought greater vitality to the reform. At the same time there was this surge for going into business and making a fortune and the seminar Women and Development-Status Health and Employment was proceeding full steam ahead on the campus of Tianjin Normal University in the hot summer of 1993. The President of our school personally attended the opening ceremony and made a speech extending a warm welcome from the school authorities. The Ford Foundation provided the financial support and we invited the leading scholars in womens studies in China and others noir studying and working abroad. The lectures and discussions went on day and night and lasted for two weeks. The seminar turned out to be a great success. It facilitated the formal setting up of the womens studies center at Tianjin Normal University; effectively promoted the development of womens studies in China; and facilitated international exchange in the field. (authors)