scholarly journals Critical Impact Yaw for Long-Rod Penetrators

2016 ◽  
Vol 83 (12) ◽  
Author(s):  
Xiangzhen Kong ◽  
Q. M. Li ◽  
Qin Fang

This paper presents an improved model for the critical impact yaw (or simply the critical yaw) in long-rod penetration with considering the deceleration and rotation of the rod and the crater shape of the target. Two critical yaws, θc1 and θc2, under normal impact were identified, below which there is no contact between the rod and crater sidewall (for θc1) and between the rod and the crater entrance (for θc2) during the entire penetration process. Contact functions and iterative algorithms were proposed in order to obtain these two critical yaws numerically. The influences of four dominant nondimensional numbers (i.e., the ratio of the target resistance to the rod strength λ, Johnson's damage number of the rod ς, square root of the target–projectile density ratio μ, and the diameter–length ratio of the rod ψ) on two critical yaws were studied for three typical rod–target systems (tungsten alloy rods penetrating steel targets, steel rods penetrating aluminum alloy targets, and steel rods penetrating steel targets). The relationship between two critical yaw angles was also discussed. A new empirical formula for the critical yaw θc2 was proposed based on the parametric study results and dominant nondimensional numbers, which extends the valid application range of the existing empirical formula.

2020 ◽  
Vol 4 (1) ◽  
pp. 86-102
Author(s):  
Tasnim Rehna ◽  
Rubina Hanif ◽  
Muhammad Aqeel

Background: Widespread social paradigms on which the status variances are grounded in any society, gender plays pivotal role in manifestation of mental health problems (Rutter, 2007). A hefty volume of research has addressed the issue in adults nonetheless, little is vividly known about the role of gender in adolescent psychopathology. Sample: A sample of 240 adolescents (125 boys, 115 girls) aging 12-18 years was amassed from various secondary schools of Islamabad with the approval of the Federal Directorate of Education (FDE), relevant authorities of the schools and the adolescents themselves. Instruments: Taylor Manifest Anxiety Scale (Taylor & Spence, 1953) and Children’s Negative Cognitive Errors Questionnaire (CNCEQ) by Leitenberg et al., (1986) were applied in present study. Results: Multiple regression analysis revealed that cognitive errors jointly accounted for 78% of variance in predicting anxiety among adolescents. Findings also exhibited that gender significantly moderated the relationship between cognitive errors and adolescent anxiety. Implications of the findings are discoursed for future research and clinical practice.


Author(s):  
Isao Okayasu ◽  
Chi-Ok Oh ◽  
Duarte B Morais

Running is one of the most popular activities in the world. Runners’ attitudes and behaviors vary depending on their running style. This study aims to construct different measures of running specialization based on the theory of specialization. This study also tests a runner’s stage of specialization segmentation based on recreation specialization and examines the predictive relationship between a runner’s specialization and event attachment. Three groups of sampling data assess the performance of diverse specialization measures for running in three marathon events. First, two surveys were conducted with marathon participants to assess the performance of diverse specialization measures for runners. Second, the third dataset was used to examine the relationship between a runner’s recreation specialization and event attachment.The study results showed that the 15 measures of specialization showed a good fit to the data. Our research showed how runners’ recreation specialization is connected to their event attachment. In addition, this study suggested event management for subdivisions of runners. Its practical implication is that recreation specialization for running can help us understand event attachment.


2020 ◽  
Vol 24 (4) ◽  
pp. 447-461
Author(s):  
Michelle (Myongjee) Yoo ◽  
Miranda Kitterlin-Lynch ◽  
Bomin Kim

Globally, festivals and host communities face increased competition each year from one another and from the myriad of alternate entertainment options. To remain competitive, festival organizers must fully understand what keeps festival attendees coming back year after year. Festivalscape has been an emerging concept of value in this arena, and previous studies have found that festivalscape has an effect on the attendees' emotion and behavior that influences their overall perceived value of the festival. The purpose of this study is to examine the relationship between festivalscape and the attendees' motivation, satisfaction, and loyalty. A self-administered questionnaire was developed and a structural equation modeling (SEM) was employed to test the proposed hypotheses. Study results support the hypotheses, indicating the importance of using festivalscape factors for festival organization and management and effective customer relationship marketing. Further, this study provides academic contributions to theoretical foundations by confirming the effects of these factors. This study also provides practical implications for managing festivals effectively and successfully.


Author(s):  
Mohinder C. Dhiman ◽  
Abhishek Ghai

The paper has a two fold purpose - examine the impact of bar service operation practices (BSOP) on organizational performance (OP) and study the relationship between organizational performance and demographic variables. Based on a survey of 362 bar managers perceptions on the impact of bar service operation practices on organizational performance were assessed by 59 practices and 6 demographic variables. Bivariate test and ANOVA were employed to test the working hypothesis in the study. Results indicated that there is a positive relationship between the bar service operation practices and organizational performance. Further, the results indicate some practical and managerial implications to improve organizational overall performance.


2020 ◽  
Vol 48 (11) ◽  
pp. 1-11
Author(s):  
Dekuo Liang ◽  
Lei Wang ◽  
Liying Xia ◽  
Dawei Xu

Little is known regarding the life satisfaction of rural-to-urban migrants in China. In this study we assessed whether self-esteem and perceived social support mediated the association between rural-to-urban migrants' acculturative stress and life satisfaction. We use convenience sampling to recruit 712 migrants who were employed at construction sites in Nanjing for the study. Results reveal that acculturative stress was negatively related to self-esteem, perceived social support, and life satisfaction; self-esteem was positively associated with perceived social support and life satisfaction; and perceived social support was a significant and positive predictor of life satisfaction. In addition, we found that self-esteem and perceived social support partially mediated the relationship between acculturative stress and life satisfaction. Our findings provide a better understanding of life satisfaction over the course of migration, and add to knowledge of psychological well-being and mental health among rural-to-urban migrants in China.


Author(s):  
Mirosław Śnit ◽  
Maciej Misiołek ◽  
Wojciech Ścierski ◽  
Anna Koniewska ◽  
Grażyna Stryjewska-Makuch ◽  
...  

AIM, DIAPH2, PTPRD and HIC1 are the cell glycoprotein, which play an important role in the occurrence and development of tumors. This study was designed to assess the association between DIAPH2, PTPRD and HIC1 SNPs and laryngeal cancer risk. PATIENTS AND METHODS: This study including 267 patients with histologically confirmed laryngeal cancer and 157 controls. The relationship between genetic variations DIAPH2 (rs6620138), PTPRD (rs3765142) and HIC1 (rs9901806) and the onset of laryngeal cancer were investigated. Statistical analysis to calculate the relationship between DIAPH2, PTPRD and HIC1 genes polymorphism and pathogenesis of laryngeal cancer. RESULTS: The results showed that rs6620138 DIAPH2 polymorphism could increase the onset risk of laryngeal cancer. Statistically significant differences in allele distribution of rs6620138 DIAPH2 and rs9901806 HIC1 in the case and control groups subgroups. CONCLUSIONS: This study results suggested that genetic variation of rs6620138 DIAPH2 polymorphism is related to the susceptibility to laryngeal cancer. Our results provide a basis to begin basic research on the role of DIAPH2 gene in the pathogenesis of laryngeal cancer.


2021 ◽  
pp. 135910452110058
Author(s):  
Sayyeda Taskeen Zahra ◽  
Sadia Saleem ◽  
Halima Khurshid

This research aims to determine the mediating role of social deficits in self-criticism and aggression using a sample of 695 adolescents (girls = 49%, boys = 51%), aged 12 to 19 years ( M = 14.97, SD = 1.30) from an urbanized city of Pakistan. Interpersonal Difficulties Scale, Self-Criticism Scale, and Aggressive Behavior Scale were used in the present study. Results indicated a significant positive association of social deficits with self-criticism and aggression ( p < .001). Furthermore, findings also suggested a significant positive association between self-criticism and aggression. Mediation analysis revealed that self-criticism partially mediated the relationship between social deficits and aggression. Findings are discussed in terms of the expression and manifestation of self-criticism, social deficits, and aggression in adolescents in collectivistic cultures.


2021 ◽  
Vol 10 (5) ◽  
pp. 183
Author(s):  
Jennifer McGhee ◽  
Brandon Burr ◽  
Allison Vanrosendale ◽  
Deisy Figueroa

Relationship researchers have long studied factors that boost or detract from relationship success. Social support and premarital counseling are factors that have been shown to boost relationship satisfaction and relationship success. However, little is known about how relationship status may influence attitudes toward social support and premarital counseling. Using a human ecology lens, this study explores the relationship between relationship status and attitudes toward social support and premarital counseling from a sample of 385 individuals. Implications for family practitioners and future researchers are provided based on study results.


2020 ◽  
Vol 12 (6) ◽  
pp. 2407 ◽  
Author(s):  
Jaffar Abbas ◽  
Qingyu Zhang ◽  
Iftikhar Hussain ◽  
Sabahat Akram ◽  
Aneeqa Afaq ◽  
...  

This current study is among the very few investigations, which seeks the relationship between knowledge management and sustainable organizational innovation in garment business firms. This investigation focused on examining how organizational learning mediates the relationship between knowledge management and sustainable organizational innovation. This research establishes that knowledge management and organizational innovation procedures are integral parts of the progress and survival of the organizations. The received data of this population reports on the garment firms, operating their businesses in Lahore and Gujranwala. The study applied a stratified random sampling method for data collection and employed structural equation modeling (SEM) to examine the hypothesized relationships. The results specify that knowledge management shows a significant positive association with organizational learning, which in turn reveals a positive linkage to sustainable organizational innovation in SMEs of the garment industry. The study results also specify that organizational learning mediates the relationship between knowledge management and sustainable organizational innovation. This research survey identifies the significance of knowledge management and organizational learning in executing the process of organizational innovation, and it helps business managers to understand organizational learning as a mediator, which in turn indicates the benefits of knowledge management in achieving sustainable organizational innovation. This review provides an empirical indication of original data to investigate the linkage between knowledge management, sustainable innovation process, and organizational learning culture in the Pakistani garment sector. The generalizability of the study fallouts is restricted to the garment industry, and it offers valuable insights for imminent researchers.


2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Yuling Sun ◽  
Zehua Liu ◽  
Hui Yang

Although many studies have suggested that the relationship between different supply chain members significantly affects agricultural product quality, suppliers’ perceptions of fairness, which greatly influence their decisions on building the relationship quality, are often overlooked. Particularly, the empirical evidence to investigate the impacts of suppliers’ fairness on the relationship quality and the factors that affect the suppliers’ fairness is missing, and therefore this knowledge gap needs to be filled by new research. Herein, we conducted a survey of 450 agricultural product suppliers and systemically analyzed the impact of antecedents on fairness perception and the impact of fairness perception on relationship quality. In addition, we developed a structural equation model and found that information sharing and price satisfaction had significantly positive effects on procedural fairness and distributive fairness, respectively. Furthermore, our studies demonstrated that procedural fairness is more important in improving the relationship quality than distributive fairness. However, supplier dependence is another important impact factor, and it greatly decreases the positive effects of suppliers’ fairness on relationship quality. In summary, the study results provide several managerial implications and extend our understanding of the importance of suppliers’ fairness in the relationship quality, which involves product development with respect to the supplier’s performance.


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