Wednesday, March 19, 2025

 

Terrorists time their attacks during periods of security or financial crisis



New research from Binghamton University political scientists explores why reputation matters in the timing of violent acts




Binghamton University

al-Shabaab attack in Mogadishu, Somalia 

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The remains of a building following an al-Shabaab attack in Mogadishu, Somalia, on October 14th, 2017.

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Credit: AMISOM Public Information





BINGHAMTON, N.Y. -- Terrorists time their attacks during periods of security or financial crisis, according to new research from political scientists at Binghamton University, State University of New York.

To a bystander, a terrorist attack may seem an indiscriminate act of violence, timed solely to inflict maximum damage on its victims.

But the timing of such attacks is strategic, involving a series of tradeoffs to strike vulnerable targets while preserving the group’s reputation, according to research by Binghamton University Professor of Political Science Seden Akcinaroglu and doctoral candidate Yusuf Evirgen. Published in the journal Conflict Management and Peace Science, their article “Ripe moments for terror attacks: Opportunity benefits-reputation tradeoff” explores this dynamic.

“Reputation is crucial for terrorist groups because it affects their ability to gain public support, attract recruits, and negotiate with governments,” Evirgen and Akcinaroglu explained. “A negative reputation can alienate potential supporters and invite harsher counterterrorism measures.”

For terrorists, the purpose of violence goes beyond just instilling fear. Terrorist groups engage in violence to achieve strategic goals, such as undermining government legitimacy, achieving policy changes through coercion, and demonstrating the group’s resolve, Akcinaroglu and Evirgen said. Violence can also communicate strength to rivals, supporters or potential recruits.

“The choice of timing and target often conveys a specific message about the group’s objectives,” they explained​.

On the other hand, indiscriminate violence can harm a group’s reputation, particularly when it results in civilian casualties that alienate the larger public. Terrorist groups will sometimes avoid claiming responsibility for particularly brutal attacks to avoid this backlash, they said.

What differentiates indiscriminate and deliberate violence is targeting; while the former affects random people, the latter focuses on perceived enemies, such as government officials or military targets.

Humanitarian, security and financial crises

Acts of violence often occur during periods of crisis when state resources are stretched thin. But not all crises are created equal.

Akcinaroglu and Evirgen analyze three types of crises in connection with terrorist attacks: security crises, which involve war or the threat of war; financial crises, such as recessions or economic downturns; and humanitarian crises, such as natural disasters.

While security or financial crises represent targets of opportunity, terrorists are less likely to strike during humanitarian crises, they found; the shared human suffering during humanitarian crises creates an environment in which violence is particularly condemned. In these situations, terrorist groups will often participate in relief efforts to improve their public image. Examples include the PKK after the 1999 earthquake in Izmit, Turkey, and the Free Aceh Movement in Indonesia following a 2005 tsunami.

In humanitarian crises, tensions across ethnic and social divides are subsumed by a larger compassion. Security and financial crises, on the other hand, exacerbate these divides, eroding empathy as groups compete for resources or political power.

For terrorist groups, financial crises provide the best opportunity to strike.

Threats of war can trigger a “rally around the flag” effect, boosting the perception of government legitimacy and reducing support for terrorist groups, although persistent ethnic or political divisions can still provide them with an opening.

“There is also evidence that some governments may exaggerate or manufacture security threats to unify the population and justify repressive measures​,” Akcinaroglu and Evirgen said.

Economic downturns, on the other hand, can weaken state legitimacy and public trust. Reforms intended to address the crisis often lead to mass layoffs, the collapse of social safety nets and widespread bankruptcies, which deepen divisions in society.

Terrorist groups can exploit the fragmented public response at little reputational cost. The researchers point to the Indonesian financial crisis of 1997 to 1998, which not only destabilized that country’s economy, but fueled widespread violence against ethnic Chinese.

“Understanding these patterns can help policymakers anticipate and mitigate attacks more effectively,” the researchers said. “The research also challenges the notion that terrorists act purely opportunistically—reputation matters, and their decisions reflect careful cost-benefit calculations​.”

 

Kansas, Missouri farmers avoid discussing climate change regardless of opinions, study finds



Wether they believe or are skeptical, farmers don't discuss climate change to avoid arguments, violence, harm to livelihood



Peer-Reviewed Publication

University of Kansas




LAWRENCE — We have all avoided having conversations if the topic is controversial or may lead to an argument. Farmers, who are on the front lines of climate change, avoid talking about it with their neighbors, community members, elected officials and even their own families because of potential conflict and harm to their livelihood, new research from the University of Kansas has found.

Researchers conducted interviews with more than 20 farmers in Kansas and Missouri to understand their communication about climate change. Results showed respondents had a range of views on climate change from being convinced of its effects and taking action in their farming operations to skepticism — but all avoided discussing it to varying extents.

“People were worried about a variety of reactions. Some said they couldn’t even talk about it with their families because they would give them a weird look if they brought it up,” said Hong Tien Vu, associate professor of journalism & mass communications at KU and lead author of the study. “That was a low-level worry, but others said they had heard people laughing at them or were concerned about their neighbors not working with them if they had different opinions.”

The study was born from research Vu and students started during the COVID-19 pandemic. The group received private donor funding to study local climate change effects. Students interviewed scientists on campus and farmers in surrounding communities about climate change, their views on it and how it affects them. Farmers were reluctant to discuss the topic on camera.

“When we talk about climate change, we tend to look at broad effects like sea level rise. It can be difficult for people to find relevance in topics like that in their lives. We wanted to focus on factors that relate to people’s lives here in Kansas,” Vu said. “We wanted to interview farmers specifically because they are on the front lines of climate change impacts, both in terms of contributing to it through factors like emissions and feeling the effects of it.”

Given farmers’ reluctance to discuss the topic on camera, researchers decided to conduct interviews in which they could guarantee anonymity for respondents. Farmers then discussed their opinions on the topic, how it affects their lives and work, and why they avoid discussing it. 

The researchers examined the topic through the lens of spiral of silence theory, which posits that when discussing controversial topics, people judge the prevailing opinion of others before deciding whether to speak. If they feel they are in the minority, people will often choose not to discuss a topic, which can have long-term ramifications, including silencing people and exacerbating problems that people choose not to address.

The results confirmed the prevalence of a spiral of silence among Kansas and Missouri farmers. The respondents were both men and women, ranging in age from their 20s to 70s. When asked their thoughts on climate change, responses ranged from believing it is real, scientifically proven and having effects now, to being skeptical both of its prevalence and whether it is caused by humans. But across the board, respondents indicated they generally avoid discussing the topic.

The farmers gave a range of reasons why they avoid it. Many simply did not want a conflict that could result in violence or an argument with neighbors or community members. Some feared it could damage their business, as neighbors might be less likely to work with them and share equipment or people might give them a negative online review and tell people not to buy their products at farmers' markets and other locales if they disagreed with their views.

Farmers said they also tried to gauge a person’s opinions based on interpersonal cues before deciding whether to discuss climate change. For example, the type of vehicle a person drives, whether a large pickup or hybrid car, can provide clues about their opinions on the matter.

Spiral of silence theory holds that people traditionally used news media to gauge political opinion on a potentially controversial topic. However, respondents in the study indicated they felt news media only politicized the topic and therefore was not a trustworthy way of determining how people felt. Instead, many turned to social media where they could see if people posted on the topic or to find others to discuss it with, without fear of arguments or contentious conversations.

“The algorithm can allow you to choose who to talk to or who to exclude,” Vu said of social media. “People also often feel masked on social media. To me, that is a way of losing conversations and can give you a false sense of prevalence of opinions by eliminating cross examples.”

The study, co-written with Nhung Nguyen, lecturer; Nazra Izhar, doctoral candidate; and Vaibhav Diwanji, assistant professor of journalism and mass communications, all at KU, was published in the journal Environmental Communication.

When asked how they deal with the effects of climate change, several farmers reported taking measures such as switching to organic methods, fallowing fields to counter overuse of land and seeking information on more sustainable practices. Several also reported feeling isolated in general and given that they felt they could not discuss climate change, took to journaling as a way to process their thoughts.

Vu and colleagues, who have studied how climate change is viewed and reported globally, said understanding how the issue is viewed and discussed in more local settings is also important because people need to work together in day-to-day operations like farming as well as for policy solutions. If pressing issues are not discussed, it can negatively affect how they are dealt with on interpersonal levels and at local levels of government, they argue. 

As part of the larger research project, the group plans to use journalistic storytelling techniques to document how people are dealing with climate change locally and their opinions on the topic. They also plan to test the effects of different content elements such as psychological distance and modalities like text, video, podcast or virtual reality on public perceptions of and behaviors toward sustainability.

“In our conversations with farmers, we found they often felt excluded from other conversations on climate change,” Vu said. “It felt like they were picking their battles with everyone, because they are often blamed for things like emissions, while working on adjusting their farming practices for mitigation and adaptation purpose. We think not talking about climate change is a serious issue.”

 

Threatened by warming waters, brook trout may be able to adapt to hotter weather



Heatwaves appear to trigger heritable gene expression changes that may help make the fish more tolerant of thermal stress, researchers report in novel study




Penn State

brook trout 

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Brook trout, an iconic coldwater fish species native to streams and lakes in the eastern United States and Canada, begin to experience declines in growth rate in water above 61 degrees Fahrenheit and acute heat stress above 68 degrees Fahrenheit. In this study, researchers caught, sampled and released fish in four streams in Pennsylvania. 

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Credit: Jason Keagy/Penn State




UNIVERSITY PARK, Pa. — Brook trout may have a genetic trick up their scales when it comes to adapting, with limitations, to heatwaves that threaten their existence. Scientists have known for years that brook trout — an iconic coldwater fish species native to streams and lakes in the eastern United States and Canada — are extremely vulnerable to warming temperatures, with more than half of their habitats characterized as highly sensitive and highly vulnerable to such changes by U.S. Forest Service researchers in 2010. Now, a novel study led by researchers at Penn State suggests that brook trout are capable of mounting a protective genetic response to thermal stress that can be passed on from one generation to the next.

“The responses to heat stress had a high degree of plasticity, with brook trout exhibiting the ability to acclimate and increase tolerance to higher temperatures,” said team leader Jason Keagy, assistant research professor of wildlife behavioral ecology. “Our study covered two heatwaves, and the overall change in expression patterns was more intense during the second heatwave. We think the first heatwave ‘primed’ the response for the second.”

In findings recently published in Science of the Total Environment, the researchers reported that groups of genes involved in immune response and oxygen-conveying activity were upregulated and downregulated, respectively, at higher water temperatures in two successive heat waves in July and August 2022 in four small central Pennsylvania mountain streams.

“Detecting these gene-expression fingerprints of thermal stress allows us to directly ‘ask’ the fish how they are feeling, whether they are stressed out,” Keagy said.

The team closely monitored air and water temperatures and sampled 116 brook trout at eight time points during the heatwaves in each of the four streams. Keagy and his collaborators extracted the fish’s RNA — the genetic material used to build proteins and help regulate biological functions — from their gills without injuring the fish. They sequenced the RNA, a technique that reveals the number of molecules and in what order they appear, and quantified the expression levels of 32,670 unique genetic transcripts, which carry the instructions for proteins essential for cell and tissue function. The team found that overall gene-expression patterns in response to water temperature change were similar among fish in all four streams studied.

The researchers also detected 43 genes that were differentially expressed at different time points and followed the same expression pattern during the two heatwaves. Of these genes, 42 related to water temperature. Some of these differentially expressed genes — including those producing heat-shock proteins and cold-metabolism proteins — have been linked to temperature responses in other studies, the researchers said.

Keagy noted that brook trout begin to experience declines in growth rate in water above 61 degrees Fahrenheit and acute heat stress above 68 degrees Fahrenheit, with critical thermal maximum temperatures reached near 84 degrees Fahrenheit. He explained that the frequency and intensity of extreme weather events is increasing, which is predicted to reduce suitable thermal habitats for brook trout, especially when combined with other environmental changes like land-use that removes forests along streams and the introduction of non-native competitors like brown trout.

“Critically, extreme weather events can be more important drivers of extirpation — state or regional disappearance of a species — and selection than changes in annual or seasonal averages, and they pose a particularly large threat to cold-blooded organisms with body temperatures that fluctuate with their environment,” Keagy said.

Studying the gene response of fish to temperature in nature where conditions are “messy,” rather than in the controlled conditions of a lab was a complicated and challenging endeavor, Keagy pointed out.

“This study was a massive undertaking,” he said. “We identified heatwaves using local weather predictions of air temperature and then tried to capture fish at the beginning, peak, ending and one week after each heatwave. We had no way of predicting how the stream water temperatures would be responding. And yet — led by our talented graduate student Sarah Batchelor, co-author on the paper — we pulled it off quite well. Then, the data analysis was not straightforward — gene-expression studies tend to be much simpler when based in the laboratory — but our lab’s postdoctoral scholar, first author Justin Waraniak, came up with novel and creative ways to analyze the data.”

This study was the one of the firsts test of the emerging field of landscape transcriptomics, recently envisioned by an interdisciplinary team led by scientists in Penn State’s College of Agricultural Sciences. The team, which Keagy leads, hypothesized that it would be possible to collect animals and plants from the wild and determine which stressors they experienced based on specific patterns or signatures in their gene-expression profiles. This is the second landscape transcriptomics paper published this year, with another research group in the college recently publishing on stressors in bumble bees.

“This study shows the utility of landscape transcriptomic approaches to identify important biological processes governing wild organisms’ responses to short-term stressors,” Keagy said. “The results of this study can guide future investigations to identify phenotypic and genetic diversity that contribute to adaptive responses to heatwaves and improve predictions of how brook trout populations will respond to future climate change.”

This research was supported by grants from the Penn State College of Agricultural Sciences Strategic Networks and Initiatives Program and the U.S. Department of Agriculture’s National Institute of Food and Agriculture.


Graduate student Sarah Batchelor, left, co-author of the study, and Julia Langlois, undergraduate research assistant, search for brook trout to sample in Big Poe Creek. 

Credit

Jason Keagy/Penn State



Brook trout were sampled by researchers in four streams in Centre County and Huntingdon County, Pennsylvania: Big Poe, Standing Stone, East Branch Standing Stone and Shavers creeks. 

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Penn State

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What’s behind the ‘pop and slosh’ when opening a swing-top bottle of beer?



Determining the acoustics and physics at play behind the liquid sloshing and popping sounds that occur while opening a swing-top bottle of beer


American Institute of Physics

A frame of the group’s high-speed recording after popping a homebrewed bottle of beer. 

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A frame of the group’s high-speed recording after popping a homebrewed bottle of beer.

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Credit: Max Koch




WASHINGTON, March 18, 2025 — In a fun experiment, Max Koch, a researcher at the University of Göttingen in Germany — who also happens to be passionate about homebrewing — decided to use a high-speed camera to capture what occurs while opening a swing-top bottle of homebrew.

When Robert Mettin, who leads the Ultrasound and Cavitation group at the university’s Third Institute of Physics, Biophysics, suggested that Koch should submit the findings to the special “kitchen flows” issue of Physics of Fluids, from AIP Publishing, Koch and his colleagues chose to expand on the home experiment and delve into the novel acoustics and physics at play.

The group found that the sound emitted by opening a pressurized bottle with a swing-top lid isn’t a single shockwave, but rather a very quick “ah” sound. Their high-speed video recordings captured condensation within the bottleneck that vibrated up and down in a standing wave. These recordings, along with high-fidelity audio recordings and computational fluid dynamics simulations, confirmed that this wave is the origin of the “ah” sound.

“The pop’s frequency is much lower than the resonation if you blow on the full bottle like a whistle,” said Koch. “This is caused by the sudden expansion of the carbon dioxide and air mixture in the bottle, as well as a strong cooling effect to about minus 50 degrees Celsius, which reduces sound speed. The decibels it emits are high — inside the bottleneck it’s as loud, or even louder, than a turbine of an airplane within 1 meter, but it doesn’t last long.”

After opening the bottle, the dissolved carbon dioxide starts to form inside the beer and triggers the liquid level to rise. The motion of the bottle also causes the liquid to slosh, and the group’s high-speed recordings captured this wave within the bottleneck.

Additionally, they noticed that the momentum transfer of the lid hitting the glass with its sharp edge after popping might also trigger gushing, due to the enhanced formation of bubbles.

“It was a challenge to explain the low frequency of the ‘ah’ sound emitted by the opening and find a simple model to explain the values,” Koch said. “One thing we didn’t resolve is that our numerical simulations showed an initial strong peak in the acoustic emission before the short ‘ah’ resonance, but this peak was absent in the experimentation.”

Simulations aside, Koch joked that another great challenge was drinking the homebrewed beverages and still maintaining clarity during the experiment.

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The article “On the popping sound and liquid sloshing when opening a beer” is authored by Max Koch, Matti Tervo, Rafael Manso Sainz, Christiane Lechner, and Robert Mettin. It will appear in Physics of Fluids on March 18, 2025 (DOI: 10.1063/5.0248739). After that date, it can be accessed at https://doi.org/10.1063/5.0248739.

ABOUT THE JOURNAL

Physics of Fluids is devoted to the publication of original theoretical, computational, and experimental contributions to the dynamics of gases, liquids, and complex fluids. See https://pubs.aip.org/aip/pof.

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