Search Results (28)

Advancements in multi-rotor quadcopter technology and sensing capabilities have led to their increased utilisation for last-mile delivery. However, battery capacity constraints limit their use in extended-distance delivery scenarios. A visual servoing implementation is first proposed that leverages a CUDA-accelerated tag detection algorithm for real-time pose estimation of the target. A new approach is then developed to enhance quadcopter package collection by implementing a control scheme to attenuate aggressive load-swing in a payload arm that shifts from horizontal to vertical after obtaining a vertically mounted payload. The motion of the payload arm imposes a shift in the system’s centre of mass, leading to a possible instability. A non-linear control scheme is then introduced to address this problem through attenuation of the residual energy from payload oscillation. The performance of the visual servoing approach is validated through both numerical simulations and a physical quadcopter implementation, along with the performance of the load-swing attenuation through numerical simulations. Full article

The impact of climate risk on corporations is both complex and systemic. This study finds that an increase in climate risk exposure prompts firms to restructure their strategies, primarily leading to a strengthening of their strategic defensiveness and a decline in their strategic aggressiveness. Mechanism analyses reveal that this shift is primarily driven by the intensification of financing constraints, elevated operational risks, and reduced risk-taking capacity associated with increased climatic risk exposure. These effects are especially pronounced in private firms, firms with lower environmental performance, and those undergoing aggressive digital transformation or exhibiting a high degree of internationalization. Further analysis shows that although firms tend to adopt more passive defensive strategies in response to climate risk, they also actively pursue vertically integrated strategies rather than relying on specialization. This study provides new insights into how firms can strategically adapt to the challenges posed by climate risks. Full article

This review examines the effectiveness of various surgical and endoscopic bariatric interventions in improving several components of metabolic dysfunction-associated steatotic liver disease (MASLD). Roux-en-Y gastric bypass (RYGB) consistently showed substantial long-term reductions in liver fat, inflammation, and fibrosis, achieving resolution of steatosis in up to 95% of cases. Vertical sleeve gastrectomy (VSG) provided comparable hepatic benefits, significantly reducing liver fibrosis and steatosis in approximately 60% of patients. Adjustable gastric banding (AGB) demonstrated meaningful though comparatively modest hepatic improvements, with steatosis resolution in about 42% of patients. More aggressive procedures like biliopancreatic diversion with duodenal switch (BPD-DS) showed profound metabolic effects, though with increased nutritional risk. Endoscopic therapies, including intragastric balloon (IGB) and endoscopic sleeve gastroplasty (ESG), offered notable short- to medium-term hepatic improvements, significantly reducing steatosis and fibrosis markers. Newer therapies like duodenal mucosal resurfacing (DMR) and the duodenal-jejunal bypass liner showed promising preliminary results, warranting further investigation. Overall, surgical interventions remain superior for sustained liver health improvements, while endoscopic therapies present viable alternatives for patients requiring less invasive interventions. Full article

Background/Aim: Perineal, pelvic and urogenital reconstruction presents a challenge, not only due to defect size but also due to high morbidity resulting from surgery and post-operative complications. The purpose of this study is to review the surgical approach and evaluate the results regarding pelvic/perineal reconstruction after advanced tumor resection. Patients and Methods: The total number of patients was 34 (11 males, 23 females). The histology varied, including sixteen rectal-anal squamous cell carcinomas, five Buschke-Lowenstein tumors, four vulvar-vaginal carcinomas, four sacral chordomas, two cutaneous squamous cell carcinomas, two soft tissue sarcomas and a case of Paget’s disease. Most patients had previously been treated with colectomies and/or gynecological resections and received a full dose of radiotherapy. Reconstruction was performed with the following flaps: oblique/vertical rectus abdominis myocutaneous flap (ORAM/VRAM), gracilis myocutaneous flap, inferior gluteal artery perforator flap (IGAP), internal pudendal artery perforator flap (IPAP) and lotus petal flaps. Results: Most patients had a relatively uncomplicated post-operative course. Surgical site infection and wound dehiscence occurred more commonly with the thigh flaps rather than the abdominal flaps. However, the aggression and the frequent recurrences of these tumors had as a result, only 15 out of 34 patients achieved a five-year disease-free survival. Conclusions: Pelvic and perineal defects are usually massive and the use of myocutaneous flaps to eliminate the dead space is of paramount importance. Although these are mainly salvage operations with a low survival rate, they promote patients’ quality of life. A frequent challenge is the simultaneous achievement of tumor radical resection and pelvis functionality. Full article

Background/Objectives: This cross-sectional study aimed to produce an adapted Croatian version of the Negative Behaviors in Health Care Questionnaire and to validate it. Methods: The process comprised the translation, cultural adaptation, and psychometric evaluation of the questionnaire. Clinical specialists and qualified bilingual speakers participated in both forward and backward translation. Face validity was tested. The survey’s original developer approved the final version. The reliability of the questionnaire was assessed using the test–retest method and Cronbach’s alpha coefficient. Exploratory and confirmatory factor analyses and assessments of divergent and convergent validity were conducted. The collected data were analyzed using SPSS 21.0 and R, program version 3.5.2., for Windows. Results: A five-factor structure was obtained and confirmed via CFA, although not all fit coefficients were satisfactory. The internal consistency reliability was 0.86 for the contributing factors and the seriousness of aggression, 0.79 for the use of aggression, 0.95 for the fear of retaliation, and 0.83 for the frequency of aggression; in total, α = 0.88. Test–retest reliability was moderate. All correlations were statistically significant, and the correlation was the highest for seriousness (0.754) and frequency of aggression (0.725) and the lowest for contributing factors (0.528). Test–retest reliability was satisfactory. Statistically significant differences were found when comparing respondents by gender, age, work experience, education, and hierarchical position. Conclusions: The adapted, translated, and validated survey provides a valuable tool for assessing lateral and vertical aggression between and towards nurses in terms of contributing factors, frequency, severity, uses of aggression, and fear of retaliation. Full article

Cryphonectria hypovirus 1 (CHV1) is successful in controlling Cryphonectria parasitica, the causal agent of chestnut blight, but little is known regarding its transmission to other fungi, for example the European Cryphonectria radicalis. In this study, CHV1 was transmitted (circa 200,000–800,000 copies/microliter) to seven C. radicalis isolates from infected C. parasitica. Reverse transmission to virus-free C. parasitica (European 74 testers collection) was achieved, although it was less successful (250–55,000 copies/µL) and was dependent on the vegetative compatibility (VC) group. In C. radicalis, the virus infection led to colony colour change from pink to white and smaller colonies, dependent on the virus concentration. The virus was concentrated in the colony edges, and vertically transmitted to 77% of conidia. However, several in vitro experiments demonstrated that C. radicalis was always outcompeted by the blight fungus, only suppressing the pathogen between its 25–50% inoculum level. It presented good secondary capture only when acting as a pioneer. Two types of in planta assays (individual and challenge inoculations) were undertaken. Cryphonectria radicalis behaved as a saprotroph, while chestnut blight fungus behaved as an aggressive pathogen, and lesions after treatment with C. radicalis were no smaller in general, only when using cut branches. Overall, the results showed that infected C. radicalis was unable to control cankers. Full article

Workplace bullying can be defined as the repeated occurrence of aggressive behaviour by one or more persons in a position of power towards the victim. This phenomenon remains insufficiently researched among education professionals, especially between different levels of education. With this in mind, the present study aims to assess and characterise this phenomenon in the Portuguese teacher population, as well as its consequences. A digital questionnaire was used for the study, which includes a socio-demographic component and two scales, namely the LIPT-60 scale and the WBMMS scale. The questionnaire was published online and made accessible to all teachers employed in schools in Portugal. The final sample consisted of 2003 teachers. The obtained results revealed that 22.5% of the sample acknowledged experiencing workplace bullying. The most prevalent aggressive behaviours included communication blockage and defamation and disregard for work. Vertical descent emerged as the most common form of bullying. More than half of the victims reported experiencing health issues, with a quarter of them requiring a medical certificate. Finally, we would like to emphasize the significance of this study as an initial step towards the prevention and reduction of workplace bullying among Portuguese teachers. Full article

Healthcare professionals experience negative behaviors such as incivility from various sources within the hospital environment. However, little is known regarding the experience of unlicensed assistive personnel with these behaviors. Using a cross-sectional survey design, the research team aimed to examine the presence, sources, and impact of negative behaviors among registered nurses and unlicensed assistive personnel within a US hospital. Descriptive and inferential statistics were used to analyze quantitative data, while thematic analysis was used to analyze the qualitative responses. A total of 309 participants completed the survey, and 135 participants responded to three qualitative questions. Most respondents identified inadequate staffing/resources to handle workload (87%) and job stress leading to loss of control over behavior as contributing factors to lateral/vertical aggression in the work environment (71%). Impacts of negative behavior on job performance were related to both personal well-being and the work environment. Demoralization was identified as a common consequence of negative behaviors for individuals and within the work environment. The results suggested that registered nurses, unlicensed assistive personnel, and nursing leadership may benefit from system-wide approaches addressing negative behaviors such as incivility within the clinical environment. Specifically, efforts and policies aimed at aiding clinicians in responding to negative behaviors could potentially improve the clinical environment. Full article

The UAV industry has witnessed an unprecedented boom in recent years. Among various kinds of UAV platforms, the vertical take-off and landing (VTOL) aircraft with fixed-wing configurations has received more and more attention due to its flexibility and long-distance flying abilities. However, due to the fact that the advance ratio of regular propeller systems during the cruise phase is significantly higher than that during the VTOL phase, a variable-pitch propeller system is proposed and designed which can be applied without additional propulsion mechanisms during both flying stages. Thus, a VTOL aircraft platform is proposed based on the propulsion system constructed of variable-pitch propellers, and appropriate control manners are precisely analyzed, especially during its VTOL phase. As a basic propulsion system, a nonlinear model for variable-pitch propellers is constructed, and an optimization-based control allocation module is developed because of its multi-solution and high-order characteristics. Finally, the objective function is designed according to the stability and energy consumption requirements. Simulation experiments demonstrate that the proposed controller is able to lower energy consumption and maintain the stability of the aircraft while tracking aggressive trajectories for large-scale VTOLs with noises at the same time. Full article

Melanoma progression is a multistep evolution from a common melanocytic nevus through a radial superficial growth phase, the invasive vertical growth phase finally leading to metastatic dissemination into distant organs. Melanoma aggressiveness largely depends on the propensity to metastasize, which means the capacity to escape from the physiological microenvironment since tissue damage due to primary melanoma lesions is generally modest. Physiologically, epidermal melanocytes are attached to the basement membrane, and their adhesion/migration is under the control of surrounding keratinocytes. Thus, the epidermal compartment represents the first microenvironment responsible for melanoma spread. This complex process involves cell–cell contact and a broad range of secreted bioactive molecules. Invasion, or at the beginning of the microinvasion, implies the breakdown of the dermo-epidermal basement membrane followed by the migration of neoplastic melanocytic cells in the superficial papillary dermis. Correspondingly, several experimental evidences documented the structural and functional rearrangement of the entire tissue surrounding neoplasm that in some way reflects the atypia of tumor cells. Lastly, the microenvironment must support the proliferation and survival of melanocytes outside the normal epidermal–melanin units. This task presumably is mostly delegated to fibroblasts and ultimately to the self-autonomous capacity of melanoma cells. This review will discuss remodeling that occurs in the epidermis during melanoma formation as well as skin changes that occur independently of melanocytic hyperproliferation having possible pro-tumoral features. Full article

The present study reports a critical review of NIO′s business model considering the evolving landscape of the electric vehicle market and servicing. The objective of this study is to develop a comprehensive framework that facilitates the identification of key elements characterizing a company’s business model and highlights ongoing transformations crucial for adaptation and survival in a rapidly changing environmental context. Focusing on the case study of NIO, a relatively young Chinese original equipment manufacturer (OEM) specializing in high-tech electric cars, the research delves into the challenging scenario of the Chinese electric vehicle market, which recently faced a bubble in 2023. The market proliferation, supply chain disruptions, and price wars triggered by Tesla have resulted in a survival struggle for numerous automotive startups, leaving larger companies with increasing market shares. Despite facing adversities, NIO managed to secure a promising segment catering to premium-range battery electric vehicles (BEVs), establishing a competitive advantage through differentiation. By pursuing ambitious investments, the company aims to create economies of scope and achieve cost leadership, venturing into new market sectors and vertically integrating the production chain. Given NIO’s agility in adapting to market conditions, aggressive entry into new segments, and a strategic vision for the future, it serves as an excellent candidate for testing and validating the proposed framework. The research sheds light on NIO’s trajectory and offers insights into its potential for sustained growth in the dynamic electric vehicle market. Full article

High stocking density is used in aquaculture to optimize farming. However, such strategies can stress territorial fish by increasing aggression, thus harming the fish welfare and productive performance. Here, we tested the effect of long-term tactile body stimulation (TS) on alleviating the impact of high stocking density in Nile tilapia (Oreochromis niloticus). Ten males were grouped for 21 days into four treatments (10 replicates each one) combining TS with high (1.2 kg·m³) or low (0.6 kg·m³) densities: (1) without TS and high density; (2) without TS and low density; (3) with TS and high density; and (4) with TS and low density. A rectangular PVC frame fitted with vertical plastic sticks sided with silicone bristles was placed in the center of aquarium. The fish receive TS when passing through the bristles. An apparatus without bristles was used as control. We found higher cortisol levels under TS conditions. All parameters of productive performance (growth, food efficiency, and condition factor) were higher in the treatment with TS and low density, lower in the treatment without TS and high density, and similar between treatments high density with TS and low density without TS. The results suggest that TS improves productive performance of Nile tilapia, counteracting the negative effects of high stocking density. Full article

Lymphomas related to HIV are generally aggressive and have a poor prognosis, despite the use of combined antiretroviral therapy (cART) and effective chemotherapy treatment. To determine survival and prognostic factors in children and adolescents living with HIV (CLWH) in Rio de Janeiro (RJ), Brazil, who developed lymphomas, we performed a retrospective and observational study of vertically infected CLWH aged from 0 to 20 incomplete years during1995 to 2018 at five reference centers for cancer and HIV/AIDS treatment. Of the 25 lymphomas, 19 were AIDS-defining malignancies (ADM) and 6 were non-AIDS-defining malignancies (NADM). The 5-year overall survival (OS) and 5-year event-free survival (EFS) probabilities were both 32.00% (95% CI = 13.72–50.23%), and the 5-year disease-free survival (DFS) probability was 53.30% (95% CI = 28.02–78.58%). In the multivariate Cox regression analysis, performance status 4 (PS 4) was considered a poor prognostic factor for OS (HR 4.85, 95% CI = 1.81–12.97, p = 0.002) and EFS (HR 4.95, 95% CI = 1.84–13.34, p = 0.002). For the DFS, higher CD4+ T-cell counts were considered a better prognostic factor (HR 0.86, 95% CI = 0.76–0.97, p = 0.017) in the multivariate Cox regression analysis. This study demonstrates, for the first time, survival and prognostic factors for CLWH who developed lymphomas in RJ, Brazil. Full article

Aggression in the animal kingdom is a necessary component of life; however, certain forms of aggression, especially in humans, are pathological behaviors that are detrimental to society. Animal models have been used to study a number of factors, including brain morphology, neuropeptides, alcohol consumption, and early life circumstances, to unravel the mechanisms underlying aggression. These animal models have shown validity as experimental models. Moreover, recent studies using mouse, dog, hamster, and drosophila models have indicated that aggression may be affected by the “microbiota–gut–brain axis.” Disturbing the gut microbiota of pregnant animals increases aggression in their offspring. In addition, behavioral analyses using germ-free mice have shown that manipulating the intestinal microbiota during early development suppresses aggression. These studies suggest that treating the host gut microbiota during early development is critical. However, few clinical studies have investigated gut-microbiota-targeted treatments with aggression as a primary endpoint. This review aims to clarify the effects of gut microbiota on aggression and discusses the therapeutic potential of regulating human aggression by intervening in gut microbiota. Full article

Ambiguous silhouettes representing human individuals which perform unimanual actions are interpreted more often as right-handed. Such a preference might reflect a perceptual frequency effect, due to the fact that most social interactions occur with right-handers. As a consequence, observers would preferentially attend to the region in which others’ dominant hand usually falls, thus increasing the efficiency in monitoring both aggressive and communicative acts. Given that men can be more dangerous compared with women, the right-hand bias should be larger when observing male rather than female individuals, and given that aggressive interactions involve men more frequently than women, it should be larger in male rather than female observers. However, previous studies did not specifically test whether: (i) male—compared with female—observers pay more attention to the right side of others (regardless of the observed individuals’ sex), or (ii) observers (regardless of their sex) pay more attention to the right side of male—compared with female—individuals. Therefore, in the present study we used ambiguous human silhouettes rotating about their vertical axis with one arm extended in order to determine whether the rightward bias is larger for male rather than female figures and/or in male rather than female participants. According to our data, the bias toward the right side of human bodies was not significantly associated with either the figure’s or the participant’s sex. Full article