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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.

Purpose: For contemporary policing, the police–public communication process is one of the most essential elements of law enforcement management. The promotion of police–public relations, police integrity, and police accountability all depend upon effective communication. While ever a challenge for law enforcement agencies, the coming of the COVID-19 pandemic changed substantially the character of both mediated and interpersonal communication between the police and those policed as of 2020.

Methodology/Approach: Building upon the concept of electronic community-oriented policing (E-COP), this chapter proposes an expanded theoretical model of police–public online communication during a time in which in-person contacts are constrained and various forms of mediated communication assume major importance.

Findings: Using a sample of COVID-related police Facebook posts collected between February 1 and May 31, 2020, this chapter illustrates how the expanded E-COP model is helpful in orchestrating an effective police response to a major public health emergency. It also advances the argument that police–public online communication will be not only become widely used during the ongoing COVID-19 pandemic, but will likely become routinized.

Originality/Value: The proposed model also provides practical suggestions for law enforcement agency leaders who endeavor to advance the goals of community-oriented and guardianship-directed policing. Some likely barriers to more effective use of social media are singled out for special attention.

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.