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Previous studies consistently indicate that police agencies tend to use social media to assist in criminal investigations, to improve police-community relations and to broadcast both crime- and non-crime-related tips promotive of public safety. To date, little research has examined what content the police tended to post on their social media sites during the COVID-19 pandemic.

By selecting the 14 most widely attended police agencies' Facebook accounts, the current study collects and analyzes a sample of 2,477 police Facebook postings between February 1 and May 31, 2020. By using a mix-method approach, the study addresses three research questions: 1) What kinds of messages did the police tend to post on their Facebook pages before and during this pandemic? 2) What types of COVID-related police Facebook postings were made? 3) How did the public react to COVID-19-related police Facebook postings?

The findings suggest that the police have come to believe that social media can be used as an effective police−public communicative tool in stressful times. The findings also suggest that social media platforms have become a routinized tool of police−public communications which can, to some appreciable extent, substitute for the in-person contacts traditionally relied upon in community policing.

This study of police use of social media explores the question of whether the use of these media can serve as an effective tool to connect the police with the public under circumstances where in-person contacts are greatly constrained. Some public policy implications emerging from the findings reported are discussed, along with implications for further research along these lines.

Most police agencies in the USA make the claim that they use social media, and such use is drawing a great academic attention. Most studies on police use of social media focus on the content of police social media websites. Little research, however, has been conducted regarding what types of police agencies are in fact making use of social media. The purpose of this paper is to fill this gap in the knowledge.

The study reported here analyzes the 2013 Law Enforcement Management and Administrative Statistics (LEMAS) data set to identify the principal organizational characteristics of police agencies associated with the use of social media. Binary logistic regression is used to identify significant independent predictors of police use of social media, viewed here as a form of innovation.

The findings indicate that the workforce size (commissioned and civilian personnel) of a police agency, the level of participation in multi-jurisdictional task forces and the early use of an official agency website to communicate with the public are the predictors of police use of social media.

Three theories pertaining to organizational behavior (i.e. contingency theory, institutional theory, and resource dependency theory), as well as Maguire’s (2003) study, are used to establish the theoretical framework for the research reported here.

Viewed as a pioneering study testing organizational theories related to police use of social media, the current study sets forth findings that help deepen the collective understanding of contingency theory, institutional theory and resource dependency theory as frameworks for explaining organizational behavior in policing.

The purpose of this paper is to achieve the trajectory tracking measurement of a moving target based on double position sensitive detectors (PSDs).

In this paper, first, a double PSD-based measurement system including hardware system and software system is built up. Then, the working principle is studied to calculate parameters, and calibration experience is conducted. Finally, this double PSD-based measurement system is used to test angular displacement and axial displacement on the tool magazine and automatic tool changer.

In the experiment, the maximum position error of a space point based on double PSD measurement system is 0.8566 mm, and the average error is 0.4716 mm. These results show that the built double PSD-based measurement system of trajectory tracking of a moving target is reasonable.

Combining the characteristics of the PSD and principles of binocular visual measurement, a non-contact three-dimensional measuring system based on double PSDs is developed. The designed double-based measurement system is quite suitable for measurement of a fast-changing illuminant or in the case that the tracking accuracy is not tight.

This study examines the short- and long-term changes in officers' attitudes toward four elements of procedural justice (i.e. trustworthiness, respect, neutrality and voice) after a department-wide procedural justice training program.

This study utilized the pretest–posttest, single-group design to evaluate the training with two waves of officer surveys and conducted multivariate analyses to assess the factors that could have an impact on the training effects.

The training was effective in increasing officers' support for all four elements of procedural justice immediately, and the effects remained significant over 18 months. In addition, the analyses found that there were racial differences in officers' attitudes before and after the training, and the immediate supervisors' priority played an important role in the training effects.

There has been limited systematic research on police training. This study contributes to the understanding of how procedural justice training can help improve police-community relations and reduce the attitudinal differences between White officers and minority officers.

The purpose of this paper is to reveal the mechanism of nitrite (NO_2⁻) for the surface passivation of carbon steels in acidic environments through investigating the influences of 0.01 mol/L NaNO₂ addition on the corrosion and passivation behaviors of Q235 carbon steel in acidic phosphate buffer (APB) solutions (pH 2 to 6).

The electrochemical techniques including open circle potential evolution, potentiodynamic polarization, electrochemical impedance spectroscopy and cyclic voltammetry were applied.

In APB solutions without NO_2⁻, the Q235 steel presented the electrochemical behaviors of activation (A), activation-passivation-transpassivation and self-passivation-transpassivation at pH 2 to 4, pH 5 and pH 6, respectively; the corrosion rate decreased with the up of pH value, and the surface passivation occurred in the pH 5 and pH 6 solutions only: the anodic passivation at pH 5 and the spontaneous passivation at pH 6.

In APB solutions without NO_2⁻, the corrosion rate decreased with the up of pH value, and the surface passivation occurred in the pH 5 and pH 6 solutions only: the anodic passivation at pH 5 and the spontaneous passivation at pH 6. With the addition of 0.01 mol/L NaNO₂, into APB solutions, the variation of corrosion rate showed the same rule, but the surface passivation occurred over the whole acidic pH range, including the anodic passivation at pH 2 to 4 and the spontaneous passivation at pH 5 to 6.

Building upon prior research, the purpose of this paper is to improve the understanding of public satisfaction with the police by examining the effects of one’s military background and the interactions between one’s education and perceptions about prior contact with the police.

This study statistically analyzes the 2012 citizen survey data collected in the Hampton Roads area of Virginia, USA, and the theoretical framework includes the major models of citizen satisfaction with the police (i.e. demographic, prior contact with the police and neighborhood conditions).

Findings show that being a military family member is significantly positively related to satisfaction with the police. In addition, there are significant interactions between higher education and prior contact with the police, suggesting that people with different educational backgrounds tend to consider their prior experiences (either positive or negative) differently in their general evaluations of the police.

The study expands the literature by empirically assessing two often omitted factors that could have significant impacts on how the public evaluate the police.

The purpose of this paper is to establish a roughness prediction model of micro-milling Inconel718 with high precision.

A prediction model of micro-milling surface roughness of Inconel718 is established by SVM (support vector machine) in this paper. Three cutting parameters are involved in the model (spindle speed, cutting depth and feed speed). Experiments are carried out to verify the accuracy of the model.

The results show that the built SVM prediction model has high prediction accuracy and can predict the surface roughness value and variation law of micro-milling Inconel718.

Inconel718 with high strength and high hardness under high temperature is the suitable material for manufacturing micro parts which need a high strength at high temperature. Surface roughness is an important performance indication for micro-milling processing. Establishing a roughness prediction model with high precision is helpful to select the cutting parameters for micro-milling Inconel718.

The built SVM prediction model of micro-milling surface roughness of Inconel718 is verified by experiment for the first time. The test results show that the surface roughness prediction model can be used to predict the surface roughness during micro-milling Inconel718, and to provide a reference for selection of cutting parameters of micro-milling Inconel718.

The purpose of this paper is to understand whether firms are driven by external pressure or intrinsic value to conduct green management; this study examines the effects of coercive pressure and ethical responsibility on cross-functional green strategy alignment (GSA) and green process coordination (GPC), and in turn, market and environmental performance.

Based on data from 206 Chinese manufacturers, this study empirically tests the proposed relationships using structural equation modeling.

The results highlight the role of coercive pressure in promoting both GSA and GPC that represent functional green efforts at both strategic and operational levels, indicating firms’ critical concern of obtaining external legitimacy from stakeholders. Ethical responsibility as an intrinsic value promotes GPC that demands joint working from different functions at the operational level. Besides, the authors find that GSA improves market and environmental performance, whereas GPC only enhances environmental performance.

This study adds to the knowledge of the drivers of cross-functional green management from external pressure and intrinsic value perspectives. The findings are also fruitful for practitioners and policymakers.

This research addresses the diverse characteristics of existing railway steel bridges in China, including variations in construction age, design standards, structural types, manufacturing processes, materials and service conditions. It also focuses on prominent defects and challenges related to heavy transportation conditions, particularly low live haul reserves and severe fatigue problems.

The study encompasses three key aspects: (1) Adaptability assessment: It begins with assessing the suitability of existing railway steel bridges for heavy-haul operations through comprehensive analyses, experiments and engineering applications. (2) Strengthening: To combat frequent crack defects in the vertical stiffener end structure of girder webs, fatigue performance tests and reinforcement scheme experiments were conducted. These experiments included the development of a hot-spot stress S-N curve for this structure, validating the effectiveness of methods like crack stop holes, ultrasonic hammering and flange angle steel. (3) Service life extension: Research on the cruciform welded joint structure (non-fusion transfer type) focused on fatigue performance over the long life cycle. This led to the establishment of a fatigue S-N curve, enhancing Chinese design codes.

The research achieved several significant outcomes: (1) Successful implementation of strengthening and retrofitting measures on a 64-m single-span double-track railway steel truss girder on an existing heavy-duty line. (2) Post-reinforcement, a substantial 26% to 32% reduction in live haul stress on bridge members was achieved. (3) The strengthening and retrofitting efforts met design expectations, enabling the bridge to accommodate vehicles with a 30-ton axle haul on the railway line.

This research systematically tackles challenges and defects associated with Chinese existing railway steel bridges, providing valuable insights into adaptability assessment, strengthening techniques and service life extension methods. Furthermore, the development of fatigue S-N curves and the successful implementation of bridge enhancements have practical implications for improving the resilience and operational capacity of railway steel bridges in China.

This study aims to explore whether and how workplace loneliness leads to cyberloafing and the role of leader problem-focused interpersonal emotion management in buffering this relationship.

Drawing on ego depletion theory, the authors propose that employees' workplace loneliness leads to cyberloafing via ego depletion, while leader interpersonal emotion management (i.e. leadership behavior targeted at managing employees' negative emotions) can help to alleviate the situation. To test this study’s predictions, the authors collected multisource data at three time points from a sample of 219 employee–colleague dyads.

The results show that workplace loneliness is positively related to cyberloafing and that ego depletion mediates this relationship. Leader problem-focused interpersonal emotion management weakens the relationship between workplace loneliness and ego depletion and the indirect relationship between workplace loneliness and cyberloafing via ego depletion such that the above relationships are weak (versus strong) when leader problem-focused interpersonal emotion management is high (versus low).

The study results suggest that workplace loneliness is an important hidden danger that leads to cyberloafing because lonely employees suffer more from ego depletion. Leaders' interpersonal emotion management strategy serves as a potential buffer for such a negative effect.