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Some achieved wedge products of positive currents 有些实现了正电流的楔形产品
IF 0.5 4区 数学 Q4 MATHEMATICS Pub Date : 2022-09-01 DOI: 10.2748/tmj.20210426
Ahmad K. Al Abdulaali
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引用次数: 0
Disruptions to School and Home Life Among High School Students During the COVID-19 Pandemic - Adolescent Behaviors and Experiences Survey, United States, January-June 2021. COVID-19 大流行期间中学生的学校和家庭生活受到干扰 - 青少年行为和经历调查,美国,2021 年 1 月至 6 月。
4区 数学 Q4 MATHEMATICS Pub Date : 2022-04-01 DOI: 10.15585/mmwr.su7103a5
Kathleen H Krause, Jorge V Verlenden, Leigh E Szucs, Elizabeth A Swedo, Caitlin L Merlo, Phyllis Holditch Niolon, Zanie C Leroy, Valerie M Sims, Xiaoyi Deng, Sarah Lee, Catherine N Rasberry, J Michael Underwood

Youths have experienced disruptions to school and home life since the COVID-19 pandemic began in March 2020. During January-June 2021, CDC conducted the Adolescent Behaviors and Experiences Survey (ABES), an online survey of a probability-based, nationally representative sample of U.S. public- and private-school students in grades 9-12 (N = 7,705). ABES data were used to estimate the prevalence of disruptions and adverse experiences during the pandemic, including parental and personal job loss, homelessness, hunger, emotional or physical abuse by a parent or other adult at home, receipt of telemedicine, and difficulty completing schoolwork. Prevalence estimates are presented for all students and by sex, race and ethnicity, grade, sexual identity, and difficulty completing schoolwork. Since the beginning of the pandemic, more than half of students found it more difficult to complete their schoolwork (66%) and experienced emotional abuse by a parent or other adult in their home (55%). Prevalence of emotional and physical abuse by a parent or other adult in the home was highest among students who identified as gay, lesbian, or bisexual (74% emotional abuse and 20% physical abuse) and those who identified as other or questioning (76% and 13%) compared with students who identified as heterosexual (50% and 10%). Overall, students experienced insecurity via parental job loss (29%), personal job loss (22%), and hunger (24%). Disparities by sex and by race and ethnicity also were noted. Understanding health disparities and student disruptions and adverse experiences as interconnected problems can inform school and community initiatives that promote adolescent health and well-being. With community support to provide coordinated, cross-sector programming, schools can facilitate linkages to services that help students address the adverse experiences that they faced during the ongoing COVID-19 pandemic. Public health and health care professionals, communities, schools, families, and adolescents can use these findings to better understand how students' lives have been affected during the pandemic and what challenges need to be addressed to promote adolescent health and well-being during and after the pandemic.

自 2020 年 3 月 COVID-19 大流行开始以来,青少年的学校和家庭生活受到了干扰。2021 年 1 月至 6 月期间,美国疾病预防控制中心进行了青少年行为和经历调查 (ABES),这是一项对美国公立和私立学校 9 至 12 年级学生(N = 7,705 人)进行的基于概率的全国代表性在线抽样调查。ABES 数据用于估算大流行期间的干扰和不良经历的发生率,包括父母和个人失业、无家可归、饥饿、父母或家中其他成年人的情感或身体虐待、接受远程医疗以及完成学校作业的困难。报告中列出了所有学生以及按性别、种族和民族、年级、性别认同和完成学校作业的困难程度分列的流行率估计值。自大流行病开始以来,一半以上的学生发现完成学校作业更加困难(66%),并遭受过父母或家中其他成年人的情感虐待(55%)。与被认定为异性恋的学生(50% 和 10%)相比,被认定为男同性恋、女同性恋或双性恋的学生(74% 遭受情感虐待,20% 遭受身体虐待)和被认定为其他性取向或质疑性取向的学生(76% 和 13%)遭受父母或其他成年人情感虐待和身体虐待的比例最高。总体而言,学生因父母失业(29%)、个人失业(22%)和饥饿(24%)而感到不安全。此外,还发现了性别、种族和民族方面的差异。将健康差异和学生的干扰及不良经历理解为相互关联的问题,可以为学校和社区促进青少年健康和幸福的举措提供参考。在社区的支持下,学校可以提供协调的、跨部门的计划,促进与各种服务的联系,帮助学生解决他们在 COVID-19 大流行期间所面临的不良经历。公共卫生和医疗保健专业人员、社区、学校、家庭和青少年可以利用这些研究结果,更好地了解大流行期间学生的生活受到了怎样的影响,以及在大流行期间和之后需要应对哪些挑战,以促进青少年的健康和幸福。
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引用次数: 0
Oakmoss Exhibits Antihyperglycemic Activity in Streptozotocin-Induced Diabetic Rats. 橡树苔对链脲佐菌素诱导的糖尿病大鼠具有降血糖活性
4区 数学 Q4 MATHEMATICS Pub Date : 2022-03-16 DOI: 10.2174/1871529X22666220316100022
Ayoub Amssayef, Ismail Bouadid, Mohamed Eddouks

Aims: The study aimed to assess the antidiabetic effect of Oakmoss.

Background: Lichens species are dual organisms consisting of a mycobiont (Fungi) and a photoautotrophic partner (Algae). They are widely used in traditional medicine as a treatment against diabetes.

Objective: This study was designed to assess the antihyperglycemic activity as well as the antihyperlipidemic capacity of Oakmoss (Evernia prunastri (L.)) in normal and streptozotocin(STZ)-induced diabetic rats.

Methods: This study has evaluated the effects of aqueous extract of Oakmoss at a dose of 60 mg/kg on blood glucose levels and lipid profile in normal and STZ-induced diabetic rats. Histopathological examination of liver, determination of glycogen content in liver and skeletal muscles (EDL and soleus), antioxidant activity, and phytochemical investigation were also performed.

Results: Both single and repeated oral doses of Oakmoss (60 mg/kg) produced a significant reduction of blood glucose, triglycerides and very low-density lipoprotein (VLDL) levels in diabetic rats. Furthermore, repeated oral administration of Oakmoss during 7 days ameliorated the liver function by increasing its glycogen content and improving its histological architecture in treated diabetic rats. In addition, the aqueous extract of Oakmoss exhibited an antioxidant activity and showed richness in certain phytochemicals especially in phenolic acids and flavonoids.

Conclusion: Oakmoss, a lichen species, exhibits a potential effect on improving hyperglycemia and hypertriglyceridemia in diabetic rats.

目的:本研究旨在评估橡树苔的抗糖尿病作用:背景:地衣物种是由真菌和藻类组成的双重生物。它们在传统医学中被广泛用作治疗糖尿病的药物:本研究旨在评估橡树苔(Evernia prunastri (L.))对正常大鼠和链脲佐菌素(STZ)诱导的糖尿病大鼠的降血糖活性和降血脂能力:本研究评估了剂量为 60 mg/kg 的橡树苔水提取物对正常大鼠和 STZ 诱导的糖尿病大鼠血糖水平和血脂谱的影响。此外,还进行了肝脏组织病理学检查、肝脏和骨骼肌(EDL 和比目鱼肌)糖原含量测定、抗氧化活性和植物化学调查:结果:单次和多次口服橡树苔(60 毫克/千克)均能显著降低糖尿病大鼠的血糖、甘油三酯和极低密度脂蛋白(VLDL)水平。此外,在 7 天内重复口服橡树苔可通过增加糖原含量和改善组织结构来改善糖尿病大鼠的肝功能。此外,橡树苔的水提取物还具有抗氧化活性,并富含某些植物化学物质,尤其是酚酸和类黄酮:结论:地衣物种橡树苔对改善糖尿病大鼠的高血糖和高甘油三酯血症有潜在作用。
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引用次数: 0
Hypersurfaces of the nearly Kähler twistor spaces $mathbb{C}mathrm{P}^3$ and ${mathbb{F}_{1,2}}$ 近Kähler扭曲空间$mathbb{C}mathrm{P}^3$和${mathbb的超曲面{F}_{1,2}$
IF 0.5 4区 数学 Q4 MATHEMATICS Pub Date : 2021-12-01 DOI: 10.2748/tmj.20200930
G. Deschamps, E. Loubeau
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引用次数: 1
Laplacian comparison theorem on Riemannian manifolds with modified $m$-Bakry-Emery Ricci lower bounds for $mleq1$ $mleq1具有修正$m$-Bakry-Emery-Ricci下界的黎曼流形上的拉普拉斯比较定理$
IF 0.5 4区 数学 Q4 MATHEMATICS Pub Date : 2021-11-30 DOI: 10.2748/tmj.20201028
K. Kuwae, Toshiki Shukuri
In this paper, we prove a Laplacian comparison theorem for non-symmetric diffusion operator on complete smooth n-dimensional Riemannian manifold having a lower bound of modified m-Bakry-Émery Ricci tensor under m ≤ 1 in terms of vector fields. As consequences, we give the optimal conditions for modified m-Bakry-Émery Ricci tensor under m ≤ 1 such that the (weighted) Myers’ theorem, Bishop-Gromov volume comparison theorem, Ambrose-Myers’ theorem, Cheng’s maximal diameter theorem, and the Cheeger-Gromoll type splitting theorem hold. Some of these results were well-studied for m-Bakry-Émery Ricci curvature under m ≥ n ([19, 21, 27, 33]) or m = 1 ([34, 35]) if the vector field is a gradient type. When m < 1, our results are new in the literature.
本文用向量场证明了在m≤1条件下,具有修正m-Bakry-Émery-Ricci张量下界的完备光滑n维黎曼流形上非对称扩散算子的拉普拉斯比较定理。因此,我们给出了m≤1下修正m-Bakry-Émery-Ricci张量的最优条件,使得(加权)Myers定理、Bishop Gromov体积比较定理、Ambrose-Meyers定理、Cheng最大直径定理和Cheeger-Gromoll型分裂定理成立。其中一些结果在m≥n([19,21,27,33])或m=1([34,35])(如果矢量场是梯度类型)下的m-Bakry-Émery-Ricci曲率下得到了很好的研究。当m<1时,我们的结果在文献中是新的。
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引用次数: 5
Counting rooted spanning forests for circulant foliation over a graph 图上循环叶理的根跨越森林计数
IF 0.5 4区 数学 Q4 MATHEMATICS Pub Date : 2021-11-08 DOI: 10.2748/tmj.20210810
L. Grunwald, Young Soo Kwon, I. Mednykh
In this paper, we present a new method to produce explicit formulas for the number of rooted spanning forests f(n) for the infinite family of graphs Hn = Hn(G1, G2, . . . , Gm) obtained as a circulant foliation over a graph H on m vertices with fibersG1, G2, . . . , Gm. Each fiber Gi = Cn(si,1, si,2, . . . , si,ki) of this foliation is the circulant graph on n vertices with jumps si,1, si,2, . . . , si,ki . This family includes the family of generalized Petersen graphs, I-graphs, sandwiches of circulant graphs, discrete torus graphs and others. The formulas are expressed through Chebyshev polynomials. We prove that the number of rooted spanning forests can be represented in the form f(n) = p f(H)a(n)2, where a(n) is an integer sequence and p is a prescribed natural number depending on the number of odd elements in the set of si,j. Finally, we find an asymptotic formula for f(n) through the Mahler measure of the associated Laurent polynomial.
在本文中,我们提出了一种新的方法来产生无限族图Hn=Hn(G1,G2,…,Gm)的根生成林数f(n)的显式公式,该无限族图是在具有纤维G1,G2,Gm。该叶理的每个纤维Gi=Cn(si,1,si,2,…,si,ki)是n个顶点上的循环图,具有跳跃si,1、si,2,si,ki。该族包括广义Petersen图族、I-图族、循环图三明治族、离散环面图族等。这些公式是用切比雪夫多项式表示的。我们证明了有根生成林的数量可以用f(n)=pf(H)a(n)2的形式表示,其中a(n)是一个整数序列,p是一个规定的自然数,取决于si,j集合中奇数元素的数量。最后,通过关联Laurent多项式的Mahler测度,我们找到了f(n)的一个渐近公式。
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引用次数: 2
The commutators of Bochner-Riesz operators for elliptic operators 椭圆算子Bochner-Riesz算子的换向子
IF 0.5 4区 数学 Q4 MATHEMATICS Pub Date : 2021-09-01 DOI: 10.2748/tmj.20200415
Peng Chen, X. Tian, Lesley A. Ward
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引用次数: 1
On localization for cubical higher Chow groups 关于立方体高等Chow群的定位
IF 0.5 4区 数学 Q4 MATHEMATICS Pub Date : 2021-08-31 DOI: 10.2748/tmj.20211221
Jinhyung Park
We give a purely cubical argument for the localization theorem for the cubical version of higher Chow groups.
我们给出了高周群的立方版本的局部化定理的一个纯立方论证。
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引用次数: 0
New characterizations of the helicoid in a cylinder 圆柱体中螺旋面的新特征
IF 0.5 4区 数学 Q4 MATHEMATICS Pub Date : 2021-08-26 DOI: 10.2748/tmj.20210713
Eunjoo Lee
This paper characterizes a compact piece of the helicoid HC in a solid cylinder C ⊂ R from the following two perspectives. First, under reasonable conditions, HC has the smallest area among all immersed surfaces Σ with ∂Σ ⊂ d1 ∪ d2 ∪ S, where d1 and d2 are the diameters of the top and bottom disks of C and S is the side surface of C. Second, other than HC , there exists no minimal surface whose boundary consists of d1, d2, and a pair of rotationally symmetric curves γ1, γ2 on S along which it meets S orthogonally. We draw the same conclusion when the boundary curves on S are a pair of helices of a certain height.
本文从以下两个方面刻画了实心圆柱C⊂R中螺旋HC的紧块。首先,在合理的条件下,HC的面积在所有浸入表面中最小∑,∑∑⊂d1õd2õS,其中d1和d2是C的顶圆盘和底圆盘的直径,S是C的侧面。其次,除了HC之外,不存在边界由d1、d2和一对旋转对称曲线γ1组成的最小表面,γ2,沿其与S正交相交。当S上的边界曲线是一对具有一定高度的螺旋时,我们得出了相同的结论。
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引用次数: 0
Higher genus nonorientable maximal surfaces in the Lorentz-Minkowski 3-space Lorentz-Minkowski三维空间中的高属不可定向极大曲面
IF 0.5 4区 数学 Q4 MATHEMATICS Pub Date : 2021-06-26 DOI: 10.2748/tmj.20210907b
S. Fujimori, Shinobu Kaneda
We study nonorientable maximal surfaces in Lorentz-Minkowski 3-space. We prove some existence results for surfaces of this kind with high genus and one end.
我们研究了Lorentz-Minkowski 3-空间中的不可定向极大曲面。我们证明了这类具有高亏格和一端的曲面的一些存在性结果。
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引用次数: 1
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Tohoku Mathematical Journal
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