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The German Beveridge Curve in Light of the Shortness of Skilled Labour 从熟练劳动力短缺看德国的贝弗里奇曲线
Pub Date : 2024-05-09 DOI: 10.32388/chwuw5
Friedrich L. Sell, Juergen Stiefl
The Beveridge curve and its inward or outward shifts are legend in labour market economics. Inward shifts in particular have been shown to reflect, for example, the success of the “Hartz reforms” after 2003-2005, reforms which allegedly have improved the matching efficiency on the German labour market. More recently (not later than since 2020), the German labour market is seriously affected by a “systemic” shortness of skilled labour. The latter occurs when we observe both a rising unemployment rate among the qualified work force _and_ an increasing vacancy rate with regard to skilled labour. In this paper, we develop in three alternative writings the functional form of the Beveridge curve and its corollary, the corresponding econometric estimation equation. This enables us to empirically identify the determinants of the German Beveridge curve (2006-2023). We find evidence for the presumption that recently the German Beveridge curve shifts outwards, most likely as a consequence of the systemic shortness of skilled labour.
贝弗里奇曲线及其向内或向外的移动是劳动力市场经济学中的一个传奇。例如,2003-2005 年后 "哈茨改革 "的成功就反映了内向变化,据称这些改革提高了德国劳动力市场的匹配效率。最近(不迟于 2020 年),德国劳动力市场受到技术劳动力 "系统性 "短缺的严重影响。当我们同时观察到合格劳动力失业率上升和熟练劳动力空缺率上升时,就会出现后者。在本文中,我们用三种可供选择的写法发展了贝弗里奇曲线的函数形式及其推论,即相应的计量经济学估计方程。这使我们能够通过经验确定德国贝弗里奇曲线(2006-2023 年)的决定因素。我们发现有证据表明,最近德国的贝弗里奇曲线向外移动,这很可能是技术劳动力系统性短缺的结果。
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引用次数: 0
Evaluation of Chemical Content and Phytochemical Composition of Yemeni Almond Cultivars 也门杏栽培品种的化学成分和植物化学成分评估
Pub Date : 2024-05-09 DOI: 10.32388/a2w8xt
Muneer M. Alsayadi
The almond plant is considered one of the most important agricultural crops economically, nutritionally, and healthily, its properties and chemical composition differ according to the places of its cultivation. This study aims to estimate the chemical and phytochemical content of some local cultivars of almonds in Yemen. The chemical components, minerals, and secondary metabolites were estimated in the seeds. The results of the chemical analysis showed that the studied cultivars of Yemeni almonds contained a high percentage of nutrients compared to the imported samples, the percentages of moisture, protein, fat, carbohydrates, and ash were 2.88–3.39%, 12.7–19.15%, 36.87–65.34%, 13.23–38.02%, and 2.55–3.56%, respectively, and they contained a high content of some minerals such as iron, zinc, copper, and potassium. The total phenols in the studied almond cultivars ranged from 9.9–113 mg Gallic acid/g, and the total flavonoids ranged from 47.7–63.00 mg Rutin/g. It is concluded from the study that Yemeni almonds are characterized by unique properties that promise multiple uses in the food and pharmaceutical industries and in the prevention and treatment of many diseases.
杏仁被认为是经济、营养和健康方面最重要的农作物之一,其特性和化学成分因种植地点而异。本研究旨在估测也门一些地方种植的杏仁的化学和植物化学成分含量。对种子中的化学成分、矿物质和次生代谢物进行了估算。化学分析结果表明,与进口样品相比,所研究的也门杏仁栽培品种含有较高比例的营养成分,水分、蛋白质、脂肪、碳水化合物和灰分的百分比分别为 2.88-3.39%、12.7-19.15%、36.87-65.34%、13.23-38.02% 和 2.55-3.56%,并且含有较高含量的铁、锌、铜和钾等矿物质。所研究的杏仁栽培品种的总酚含量在 9.9-113 毫克没食子酸/克之间,总黄酮含量在 47.7-63.00 毫克芦丁/克之间。研究得出的结论是,也门杏仁具有独特的特性,有望在食品和制药业以及预防和治疗多种疾病方面发挥多种用途。
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引用次数: 0
Review of: "Experimental Behavior of Solar Still Using Mixed Oxides Mn-Fe/Silicona Resin Composite as Selective Solar Absorber" 评论"使用混合氧化物 Mn-Fe/Silicona 树脂复合材料作为选择性太阳能吸收器的太阳能电池的实验行为"
Pub Date : 2024-05-08 DOI: 10.32388/jqkdkq
A. Hassanien
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引用次数: 0
Korean K-Pop Band BTS and the Iranians: An Online Exploration 韩国 K-Pop 乐队 BTS 与伊朗人:在线探索
Pub Date : 2024-05-08 DOI: 10.32388/40wvb2
Ehsan Shahghasemi
The meteoric ascent of the Korean music ensemble BTS has captured the attention of audiences worldwide with their distinctive fusion of pop, hip-hop, and R&B. Their ability to weave religious elements into their music has propelled their success far beyond mere musical band, breaking through cultural and linguistic confines. Their impact reshapes the music industry and presents an intriguing case of cultural exchange within the global entertainment scene. This data-mining study explores BTS’s remarkable ability to cultivate a vast fanbase in Iran. However, the findings indicate a waning influence in the region, as evidenced by a decrease in tweets about BTS from 39,237 to 23,697, and finally to 9,215 over three consecutive years leading up to 2024. Despite this decline, the core group of BTS enthusiasts in Iran, predominantly loyal teenage girls, continues to actively support the group.
韩国音乐组合 BTS 以其融合流行乐、嘻哈和 R&B 的独特风格吸引了全世界观众的目光。他们将宗教元素融入音乐的能力使他们的成功远远超越了单纯的乐队,突破了文化和语言的限制。他们的影响力重塑了音乐产业,为全球娱乐圈的文化交流提供了一个耐人寻味的案例。这项数据挖掘研究探讨了 BTS 在伊朗培养大批粉丝的非凡能力。然而,研究结果表明,BTS 在该地区的影响力正在减弱,具体表现在截至 2024 年的连续三年中,有关 BTS 的推文从 39,237 条减少到 23,697 条,最后又减少到 9,215 条。尽管如此,BTS 在伊朗的核心发烧友群体,主要是忠实的少女,仍在继续积极支持该团体。
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引用次数: 0
Intersections of Statistical Significance and Substantive Significance: Pearson’s Correlation Coefficients Under a Known True Null Hypothesis 统计意义与实质意义的交叉点:已知真假假设下的皮尔逊相关系数
Pub Date : 2024-05-07 DOI: 10.32388/ps72pk
Eugene Komaroff
The editors of a special issue of The American Statistician stated: “Regardless of whether it was ever useful, a declaration of “statistical significance” has today become meaningless.” This resonates with the author's view, as “statistical significance” has been conflated with substantive significance. However, the author disagrees with the editors' call for “don’t use it.” With relatively simple graphs and tables, this author demonstrates that small sample sizes (n < 1000) require Pearson’s correlation coefficients to be screened for statistical significance (p < .05) to reduce the number of effect size errors that would otherwise be considered substantively significant under a true null hypothesis. Note here that the null hypothesis is not merely assumed true but is indeed known to be true.
美国统计学家》特刊的编辑指出"无论'统计意义'的声明是否曾经有用,如今它已变得毫无意义"。这与作者的观点不谋而合,因为 "统计意义 "已经与实质意义混为一谈。不过,作者不同意编者 "不要使用它 "的呼吁。作者用相对简单的图表说明,小样本量(n < 1000)需要对皮尔逊相关系数进行统计显著性筛选(p < .05),以减少效应大小误差的数量,否则在真正的零假设下,这些误差会被认为具有实质显著性。请注意,这里的零假设不仅仅是假定为真,而是确实已知为真。
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引用次数: 0
Trace Anomaly Redefined in a Convention for Pontryagin Equivalent to a Generalized Wick 等同于广义威克的庞特里亚金公约中重新定义的痕量异常
Pub Date : 2024-05-07 DOI: 10.32388/ngtnrs.6
Hani W. Maalouf
The lack of Unitarity is sought after, and is first resolved by an extraction from a unite-scale diffeomorphic transformation. The same result can second be found independently and is based on an orbital-wise Pfaffian differential satisfying a Conformal geodesic. Such a fundamental reason is borne out in the multiple methods for the Pontryagin Chiral Fermions density anomalies resolutions being either zero or imaginary results, were, then fore, contradictory or randomly correct outcomes due to the eigenvalue non-separable sorting. Confirming then an equivalent (1st as necessary and 2nd as sufficient) condition for Unitarity is via a regularization for the zero component of the Dirac Matrix (gamma^{0}), and a generalization of the Wick rotation, whilst both above hypotheses (may directly) be contouring around the Einstein Gravity.
首先通过从单位尺度差分变换中提取的方法解决了缺乏单位性的问题。同样的结果也可以独立找到,它基于满足共形测地线的轨道普法菲亚微分。庞特里亚金手性费米子密度反常的多种解法要么是零结果,要么是虚结果,都证明了这一根本原因,即由于特征值不可分离排序,结果是相互矛盾或随机正确的。通过对狄拉克矩阵(Dirac Matrix (gamma^{0})的零分量进行正则化,以及对威克旋转(Wick rotation)进行广义化,确认了单极性的等效(第一必要条件和第二充分条件)条件,而上述两个假设(可能直接)围绕着爱因斯坦引力展开。
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引用次数: 0
[Commentary] Postpartum Depression: An Invisible Distress in the United Kingdom [评论]产后抑郁症:英国无形的痛苦
Pub Date : 2024-05-06 DOI: 10.32388/yw3eoz
Michelle Owusua Appiah-Agyekum, Ritika Tiwari
This opinion piece explores the complexities of Postpartum Depression (PPD), its impact on the mother and child’s mental health, and the societal challenges it presents. PPD extends beyond the commonly experienced “baby blues” and can significantly impact a mother’s functionality due to its potential to evolve into a long-term depressive disorder if not properly addressed. The piece highlights the inadequacy of current maternal mental health support structures within the National Health Service (NHS), pointing out the lack of specialised treatment options tailored to new mothers' unique needs.It discusses the compound effects of social stigma and cultural barriers that limit access to necessary support, underscoring the urgent need for enhanced support systems and policy reforms. The piece highlights the serious long-term effects of PPD on children, such as developmental delays and emotional and behavioural challenges, advocating for early intervention and comprehensive support systems that address the needs of both mothers and their families. It calls for the adoption of thorough PPD management strategies, including the use of effective screening tools such as the Edinburgh Postnatal Depression Scale, and extensive educational campaigns to identify early PPD symptoms. The piece further urges for policy changes to provide new mothers with tailored resources and support, promoting a more inclusive and supportive healthcare environment for affected families.
这篇评论文章探讨了产后抑郁症(PPD)的复杂性、它对母婴心理健康的影响以及它所带来的社会挑战。产后抑郁症不仅仅是常见的 "婴儿忧郁症",如果得不到适当的治疗,它有可能演变成一种长期的抑郁症,从而严重影响母亲的功能。这篇文章强调了目前国民健康服务(NHS)中孕产妇心理健康支持结构的不足,指出缺乏针对新妈妈独特需求的专业治疗方案。文章讨论了限制获得必要支持的社会污名和文化障碍的复合效应,强调了加强支持系统和政策改革的迫切需要。文章强调了 PPD 对儿童的长期严重影响,如发育迟缓、情感和行为挑战,倡导早期干预和全面的支持系统,以满足母亲及其家庭的需求。文章呼吁采取全面的 PPD 管理战略,包括使用爱丁堡产后抑郁量表等有效的筛查工具,以及开展广泛的教育活动以识别早期 PPD 症状。文章还敦促改变政策,为新妈妈提供量身定制的资源和支持,为受影响的家庭营造一个更具包容性和支持性的医疗环境。
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引用次数: 0
Analyzing EV User Behavior in Aggregator Smart Charging with ESS and Real-Time Pricing 利用 ESS 和实时定价分析聚合器智能充电中的电动汽车用户行为
Pub Date : 2024-05-06 DOI: 10.32388/2sdpk4.2
Aakash Kumar, Draupathi Chin
Amidst increasing global electricity consumption, governments prioritize energy efficiency and electric vehicle (EV) integration into energy markets. This study examines EV aggregator strategies employing smart charging methods, adjusting charging rates based on user preferences. Through simulations in Quito's distribution system, it analyzes actions' effects on aggregator costs and technical conditions, with a focus on demand response (DR) strategies, particularly in residential areas. Exploring EVs' potential as energy storage via vehicle-to-home (V2H) and vehicle-to-grid (V2G) options, the study introduces a collaborative evaluation of dynamic pricing and peak power limiting-based DR strategies, integrating bi-directional EV and energy storage system (ESS) use. It also proposes a novel mixed-integer linear programming (MILP) model for home energy management (HEM), incorporating distributed renewable energy, V2H/V2G capabilities, two-way ESS energy trading, and diverse DR strategies. This comprehensive approach assesses the impact of EV owner preferences and ESS availability on reducing total electricity costs through case studies.
在全球用电量不断增加的情况下,各国政府将能源效率和电动汽车(EV)融入能源市场作为优先事项。本研究探讨了电动汽车聚合商采用智能充电方法的策略,即根据用户偏好调整充电费率。通过对基多配电系统的模拟,研究分析了这些行动对聚合器成本和技术条件的影响,重点关注需求响应(DR)策略,尤其是在住宅区。该研究探索了电动汽车通过车到户(V2H)和车到网(V2G)选择作为储能设备的潜力,引入了基于动态定价和峰值功率限制的需求响应策略的合作评估,整合了电动汽车和储能系统(ESS)的双向使用。研究还为家庭能源管理(HEM)提出了一个新颖的混合整数线性规划(MILP)模型,将分布式可再生能源、V2H/V2G 功能、双向 ESS 能源交易和多样化的 DR 策略结合在一起。这种综合方法通过案例研究评估了电动汽车车主偏好和ESS可用性对降低总电费的影响。
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引用次数: 0
Enhancing EV Charging Station Reliability and RAS Safety 提高电动汽车充电站可靠性和 RAS 安全性
Pub Date : 2024-05-06 DOI: 10.32388/pqujel.2
Chandru Lin
The surge in electric vehicle (EV) adoption prompts companies to prioritize dependable charging station designs, despite hurdles in maintaining consistency. A newly proposed design, featuring 36 ports, employs both uniform and non-uniform arrangements, subjected to rigorous testing with systems ranging from 50 to 350 kW. Failure rates are projected through meticulous assessments based on MILHDBK217F and MILHBK-338B standards, employing binomial distribution and cost analysis to gauge port reliability and overall station success rates. This innovative design not only bolsters voltage stability but also curtails maintenance expenses by bolstering port reliability.In the realm of robotics and autonomous systems (RAS), Deep Reinforcement Learning (DRL) demonstrates exceptional prowess but grapples with the risk of unsafe policies, potentially resulting in perilous decisions. To address this concern, a novel study introduces a reliability evaluation framework tailored for DRL-driven systems, leveraging formal neural network analysis. This framework adopts a two-tiered verification strategy: firstly, by assessing safety locally using reachability tools, and secondly, by aggregating local safety metrics across various tasks to evaluate global safety. Empirical validation validates the efficacy of this framework in fortifying the safety of RAS.
尽管在保持一致性方面存在障碍,但电动汽车(EV)采用率的激增促使公司优先考虑可靠的充电站设计。新提出的设计具有 36 个端口,采用了均匀和非均匀布置,并通过了 50 至 350 kW 系统的严格测试。通过基于 MILHDBK217F 和 MILHBK-338B 标准的细致评估来预测故障率,采用二项分布和成本分析来衡量端口可靠性和整个充电站的成功率。在机器人和自主系统(RAS)领域,深度强化学习(DRL)展现出了非凡的能力,但也面临着政策不安全的风险,有可能导致危险的决策。为了解决这一问题,一项新颖的研究利用形式化神经网络分析,引入了一个专为 DRL 驱动系统量身定制的可靠性评估框架。该框架采用了双层验证策略:首先,使用可达性工具评估局部安全性;其次,汇总各种任务的局部安全指标,以评估全局安全性。经验验证证明了该框架在加强 RAS 安全性方面的功效。
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引用次数: 0
Tobacco Use and Perceived Stress Among Male College Students in Bangalore, India 印度班加罗尔男大学生的烟草使用情况和感知压力
Pub Date : 2024-05-03 DOI: 10.32388/kbzlm8
Prakat Karki
BACKGROUND: More than 250 million individuals use tobacco in some form on a daily basis in India and adolescents make up a significant proportion of that number. The period of adolescence is critical in the initiation of smoking or tobacco use as well as its progression from experimentation to dependency. In this study, the role of psychological stress was explored with respect to cigarette consumption and level of addiction or dependence.METHODS: A total of 183 male college students (mean age= 19.8 years) from Bangalore, India completed the questionnaire booklet which included a Cigarette use screening form, the Perceived Stress Scale and the Autonomy over Smoking Scale. Of the 183 participants, there were 85 (46.2%) current smokers and 98 (53.7%) nonsmokers, and their scores on the perceived stress scale were compared using analysis of variance and independent samples _t_ tests. The relationship between levels of stress and dependence on tobacco (loss of autonomy) was also explored using Pearson’s product moment correlation (_r_).RESULTS: There was no significant difference between current smokers and nonsmokers on perceived stress (_t_[181] = -1.26, _p_ >0.05), The same result was extended when the group of nonsmokers was divided into three (Never smokers, experimental smokers and former regular smokers) and the differences in scores were tested again between all four groups (_F_[3, 179]=.642, _p_ >0.05). There was, however, a significant positive correlation between level of dependence on tobacco and perceived stress (_r_=.743, _p_ <0.01).CONCLUSION: The study found that there was no difference in perceived stress levels between smokers and nonsmokers, although there was a positive relationship between the level of perceived stress and level of tobacco dependence (loss of autonomy) among the current smokers.
背景:在印度,每天有超过 2.5 亿人以某种形式使用烟草,其中青少年占了很大比例。青少年时期是开始吸烟或使用烟草的关键时期,也是烟草从尝试发展到依赖的关键时期。本研究探讨了心理压力在卷烟消费和成瘾或依赖程度方面的作用。方法:共有 183 名来自印度班加罗尔的男大学生(平均年龄 19.8 岁)填写了调查问卷,其中包括卷烟使用情况筛查表、感知压力量表和吸烟自主性量表。在 183 名参与者中,有 85 人(46.2%)目前吸烟,98 人(53.7%)不吸烟,他们在感知压力量表上的得分通过方差分析和独立样本_t_检验进行了比较。结果:目前吸烟者和不吸烟者在感知压力方面没有显著差异(_t_[181] = -1.如果将非吸烟者分为三组(从不吸烟者、实验吸烟者和以前经常吸烟者),并再次测试所有四组之间的得分差异,则结果相同(_F_[3, 179]=.642, _p_>0.05)。结论:研究发现,吸烟者和非吸烟者的压力感知水平没有差异,但当前吸烟者的压力感知水平与烟草依赖程度(自主性丧失)之间存在正相关。
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引用次数: 0
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