Social and Behavioral Sciences Commons^™

ประสิทธิภาพของถ่านกัมมันต์ที่เตรียมจากกากขี้แป้งของโรงงานน้ำยางข้นในการกำจัดตะกั่วและปรอทในน้ำเสียสังเคราะห์, ธเรศ ศรีสถิตย์, ปนัดดา คำรัตน์, วรรธนา วงษ์สุด

Applied Environmental Research

การวิจัยนี้มีวัตถุประสงค์เพื่อศึกษาความเป็นไปได้ในของเสีย คือ การนำกากขี้แป้งจากโรงงานน้ำยางข้น มาเป็น วัตถุดิบในการผลิตเป็นถ่านกัมมันต์ โดยได้ศึกษาประสิทธิภาพของการกำจัดตะกั่วและปรอทในน้ำเสียสังเคราะห์ เปรียบเทียบระหว่างถ่านกัมมันต์ที่จำหน่ายตามท้องตลาดทั่วไปกับถ่านกัมมันต์ที่ผลิตจากกากขี้แป้งที่ใช้เกลือแกงเป็นสารกระตุ้น และทำการล้างสารกระตุ้นด้วยกรดไฮโดรคลอริค 5% เมื่อนำไปศึกษาลักษณะทางกายภาพ พบว่าถ่านขี้แป้งมีค่าไอโอดีนนัมเบอร์ 510 มิลลิกรัมไอโอดีนต่อกรัม ถ่านกัมมันต์ และมีพื้นที่ผิว 566.39 ตารางเมตรต่อกรัม จากนั้นได้ทำการทดลองแบบแบตซ์ เพื่อศึกษาปัจจัยที่มีผลต่อการดูดติดผิวตะกั่วและปรอท ได้แก่ พีเอช ความเข้มข้นของโลหะหนัก และปริมาณถ่าน โดยใช้การทดสอบไอโซเทอมการดูดติดผิวแบบฟรุนดลิช พบว่า ที่พีเอช 4 และความเข้มข้น 10 มิลลิกรัม/ลิตร มีเปอร์เซ็นต์การกำจัดตะกั่วและปรอทดีที่สุด จากการทดสอบไอโซเทอม การดูดติดผิวแบบฟรุนดลิชโดยใช้น้ำเสียสังเคราะห์แสดงให้เห็นว่าถ่านกัมมันต์ที่ผลิตจากกากขี้แป้งมีความสามารถในการดูดติดผิวตะกั่วและปรอทได้ 116.18 และ 18.78 มิลลิกรัมต่อกรัมถ่านกัมมันต์ตามลำดับ และถ่านกัมมันต์ที่จำหน่าย ทั่วไป มีความสามารถในการดูดติดผิวตะกั่วและปรอทได้11.07 และ 98.85 มิลลิกรัมต่อกรัมถ่านกัมมันต์ ตามลำดับ การทดสอบแบบต่อเนื่องในคอลัมน์ได้ใช้ถ่านขี้แป้งที่มีดินเหนียวเป็นวัสดุเชื่อมประสาน และทำการป้อนนำเสียอย่างต่อเนื่องแบบไหลลง ด้วยอัตราการไหล 3 แกลลอน/(นาที-ลูกบาศก์ฟุต) พบว่าถ่านกัมมันต์ที่ชั้นความสูง 30, 60, 90 และ 120 เซนติเมตร สามารถบำบัดตะกั่วในน้ำเสียได้ 5865.58, 3910.39, 3909.50 และ 3054.47 BV ตามลำดับ และสามารถบำบัดปรอทได้ 28.87, 16.04, 11.76 และ 9.62 BV ตามลำดับ จากผลการทดลองแบบฟรุนดลิชและแบบต่อเนื่องแสดงให้เห็นว่ากัมมันต์ที่ผลิตจากกากขี้แป้งมีความเหมาะสมในการกำจัดตะกั่วมากกว่าปรอท

การเตรียมโคแอกกูแลนต์จากกากของเสียอุตสาหกรรมเพื่อใช้ในการบำบัดน้ำเสีย, ธเรศ ศรีสถิตย์, พิงอร วิลวงษ์, มนต์ชัย ตระกูลหวังวีระ

Applied Environmental Research

การวิจัยนี้เป็นการศึกษาความสามารถในการเป็นสารสร้างตะกอน (Coagulant) และสารช่วยสร้างตะกอน (Coagulant aid) ของกากของเสียอุตสาหกรรมเพื่อนำกากของเลียมาใช้ในการบำบัดน้ำเสียโดยมีการทดลองนำกากของเสียอุตสาหกรรม 4 ชนิด ได้แก่เถ้าลอย, เศษยางพาราของโรงงานผลิตน้ำยางข้น,กากของเสียจากอุตสาหกรรมทำ กาวยางและกากตะกอนจากระบบทำน้ำประปา ทั้งนี้ได้ทำการวิเคราะห์คุณสมบัติพื้นฐานทางกายภาพและเคมี,การวัดประจุของสารช่วยตกตะกอน และทำการประเมินความสามารถในการเป็นสารตกตะกอนและสารช่วยตกตะกอนเทียบ กับการใช้สารส้มเพียงอย่างเดียว ผลการทดลองพบว่าคุณสมบัติของกากของเสียอุตสาหกรรมที่นำมาทำการวิเคราะห์มีประจุเป็นลบ จึงเหมาะกับการเป็นสารตกตะกอนร่วมกับสารส้มในการทดลองใช้กากของเสียอุตสาหกรรมเป็นโคแอกกูแลนด์นั้นพบว่าสามารถกำจัดความขุ่นได้ดีในช่วง 100-200 NTU ส่วนที่ความขุ่น 300 NTU ประสิทธิภาพในการกำจัดความขุ่นจะลดลง สำหรับประสิทธิภาพในการกำจัดความขุ่นเมื่อใช้กากของเสียอุตสาหกรรมมาเป็นโคแอกกูแลนด์นั้น มีอยู่ในช่วงร้อยละ 30-85 ที่ pH 6-8 และเมื่อนำกากของเสียอุตสาหกรรมไปตกตะกอนร่วมกับสารส้ม พบว่าประสิทธิภาพในกำจัดความขุ่นเพิ่มขึ้นเมื่อเทียบกับการใช้สารส้มเพียงอย่างเดียว ความสามารถในการลดความขุ่นของกากของเสียอุตสาหกรรมแต่ละชนิด แตกต่างกัน โดยเถ้าลอย,กากของเสียจากอุตสาหกรรมทำกาวยาง และกากตะกอนจากระบบทำน้ำประปามีค่าประสิทธิภาพในการลดความขุ่นลงได้ร้อยละ 98.5,97.5 และ 96.5 ตามลำดับ สำหรับเศษยางพาราของโรงงานผลิตน้ำยางข้นไม่เหมาะในการใช้เป็นสารตกตะกอนเนื่องจากฟล้อคไม่แข็งแรง สำหรับค่าใช้จ่ายในการจัดทำสารโคแอกกูแลนด์จากกากของเสียอุตสาหกรรมคิดเป็น 2.5 บาทต่อกิโลกรัม ส่วนสารส้มคิดในราคา 6 บาทต่อกิโลกรัม ดังนั้นการนำกากของเสียอุตสาหกรรมมาช่วยสร้างตะกอน จึงมีราคาถูกกว่าการใช้สารส้มทั้งหมด และสำหรับเถ้าลอยนั้นไม่มีค่าใช้จ่ายในการจัดทำ จึงควรพิจารณามาใช้เป็นสารช่วยสร้าง ตะกอนร่วมกับการสารส้มในการบำบัดน้ำเสีย.

Arab Media Researchers’ Perceptions Of Factors Affecting Their Research Problem Selection, Hossam Mohamed Elhamy, Maha Abdulmajeed

All Works

This study examines the factors affecting media researchers’ selection of media research problems. Combining qualitative and quantitative methods, in-depth interviews with a purposive sample of Arab media researchers were conducted, followed by applying a 22-item questionnaire on a sample of 247 from Arab media researchers. The impact of internal/subjective factors and external/objective factors, on the selection of research problems by Arab media researchers, and their perceptions were investigated. Findings revealed that internal factors are perceived to have a higher impact than external factors. However, external factors are perceived to have a stronger negative impact than positive ones. Findings also raise …

The Role Of Psychological Safety On Employee Satisfaction And Retention In Healthcare Delivery Settings: A Systematic Literature Review, Jamey Paul

Capstone Experience: Master of Public Health

The healthcare industry typically has a high rate of employee turnover due to higher job stresses and burnout, lower job satisfaction, and insufficient organizational support and work culture. This turnover has worsened since the onset of the COVID-19 pandemic. Psychological safety, a shared belief by organizational members that the team/unit is safe for interpersonal risk-taking, can be one of the many ingredients that contribute to employee satisfaction and reduce turnover. This systematic literature review explored the role of psychological safety on job satisfaction and retention of healthcare workers in delivery settings by synthesizing the known antecedents and outcomes of psychological …

Online Information-Seeking And Cancer Screening Intention: An Analysis Of The Health Information National Trends Survey 2022, Rachel Aileen Ford

Theses and Dissertations

Online information-seeking has become common in modern life, including when patients search for health information to make informed healthcare decisions. Previous research into the effect of online information-seeking on health maintenance behaviors has been mixed. This study sought to expand the current literature concerning the online information-seeking habits of cancer patients and integrate the concept of competence to analyze the effect on cancer screening adherence. The study analyzed HINTS 6 data to examine the relationship between online information-seeking and cancer screening intention as well as the relationship between social media habits and cancer beliefs. Results showed support for competence resulting …

Extreme Persuasion: Analyzing Meaning Creation And Persuasive Strategies Within Extreme Discourse On Alternative Social Media, Naomi Kathryn Lawrence

Theses and Dissertations

Despite a long history of counterterrorism strategy, the U.S. has seen a drastic increase in domestic attacks over the past decade. Previous studies have found that, due to increasing content-related restrictions, many individuals who participate in extremist-related discourse have migrated away from mainstream social media and toward alternative social media platforms. This study consists of a comprehensive content analysis based on Multimedia Critical Discourse Analysis theories to study how meaning is created via the combination of text, image, and symbols, as well as how various persuasive narratives and rhetorical appeals are used within extreme discourse on social media. This research …

Prosecutorial Discretion: District Attorneys, Public Opinion,And The Localized Rule Of Law, Yu-Hsien Sung

Theses and Dissertations

This dissertation addresses three fundamental questions regarding the politics of prosecutorial behavior. Specifically, it examines how the selectors of prosecutors influence prosecutorial decision-making under different selection methods, including electionbased systems and appointment-based systems. By using a political responsiveness framework and utilizing empirical strategies, including an experiment and the construction of prosecutor policy position data, this study offers novel insights into the subject. First, I find that voters care about prosecutors’ issue positions and rely on various cues to identify candidates whose policy positions align with their preferences, even in low-information elections. Second, elections show promise as a mechanism for holding …

The Role Of Geographic Context In Tornado Risk, Risk Perception, And Protective Action Behavior, Sarah L. Jackson

Theses and Dissertations

Our current understanding of tornado risk, risk perception, and protective action behavior lacks proper spatial consideration of local physical and social geographic contexts. This investigation asks how the conceptual drivers of tornado risk (geographic context, risk perception, and response) interact to create the spatiality of tornado risk. The study proposes that the inclusion of geographic context and its influence on perception and behavior produces differential tornado risk and seeks to determine which factors contribute to such variability. A novel, researcher-designed Tornado Risk of Place (TROP) conceptual model guides the methodological framework, incorporating statistical and geospatial analytics in an Illinois State …

The Effects Of Poly-Strengths On Psychological Wellbeing Amongst Young Adults With Childhood Poly-Victimization, Nakisa Asefnia

Theses and Dissertations

The field of trauma and victimization has undergone many evolutions in its efforts to conceptualize the impacts of victimization and more recently poly-victimization. Poly-victimization refers to the experiencing of multiple types of victimization over the lifespan. This has led to an ever-growing base of literature highlighting the many deleterious effects of these experiences on individuals’ wellbeing, and the factors which may make a person more vulnerable to victimization. However, a growing movement in the field aims to take a more strengths-based perspective that highlights the resilience of individuals, rather than risk factors, in the hopes of better understanding the factors …

Archeota, Spring/Summer 2023, Sabrina Gunn, Taliyah Shaver, Beth Gonzalez, Laura Dowell, Katie Burns, Cybele Garcia Kohel

Archeota

Archeota is a platform for SJSU iSchool students to contribute to the archival conversation. It is written BY students, FOR students. It provides substantive content on archival concerns and issues and promotes professional development in the field of archival studies. Archeota upholds the core values of the archival profession.

Contents:

The Center for Sacramento History: A Reflection on the Importance of Internships By Sabrina Gunn

Preservation Through Computer Games: Fighting Censorship by Using Minecraft By Taliyah Shaver

Meet the New 2023-2024 Archeota and SAASC Team

Farewell to Our Spring 2023 Graduates: Interviews With SAA Student Chapter Leaders

The Sidedoor Podcast: …

Pengaruh Pendanaan Iklim Terhadap Penurunan Emisi Karbon Melalui Energi Terbarukan Di Indonesia, Noviani Evitasari, Ahmad Komarulzaman

Jurnal Ekonomi dan Pembangunan Indonesia

Climate change causes various negative impacts on life, thus requiring mitigation and adaptation actions. Climate finance could support the transition to a low-carbon economy globally, including in Indonesia. However, empirical research on climate finance in Indonesia is still limited. This study uses path analysis to examine the relationship between climate finance, renewable energy mix, and carbon emissions in Indonesia from 1973 to 2020. The results show that climate finance could not directly reduce carbon emissions or promote renewable energy indirectly. These findings indicate the need to reallocate climate finance to sectors that have the potential to reduce carbon in Indonesia.

The Future Of International Law Freedom Of Journalism: A Transitional Justice Framework, Edward L. Carter

Faculty Publications

The overwhelming majority of digital and physical attacks on journalists are done with impunity. This results in lower-quality journalism, less scrutiny of government, and less healthy societies and democracies. The international human rights law concept of transitional justice could bolster collective will and inform legal mechanisms to combat such impunity. Judges and investigators in several recent cases of attacks on journalists have invoked transitional justice concepts, including truth-telling, criminal investigations and prosecutions, reparations, and institutional reforms to guarantee non-recurrence. These mechanisms should be fully implemented to protect journalism at local, national, and international levels.

Vehicle Rebalancing In A Shared Micromobility System With Rider Crowdsourcing, Ziliang Jin, Yulan Wang, Yun Fong Lim, Kai Pan, Zuo-Jun Max Shen

Research Collection Lee Kong Chian School Of Business

Problem definition: Shared micromobility vehicles provide an eco-friendly form of short-distance travel within an urban area. Since customers pick up and drop off vehicles in any service region at any time, such convenience often leads to a severe imbalance between vehicle supply and demand in different service regions. To overcome this, a micromobility operator can crowdsource individual riders with reward incentives in addition to engaging a third-party logistics provider (3PL) to relocate the vehicles. Methodology/results: We construct a time-space network with multiple service regions and formulate a twostage stochastic mixed-integer program considering uncertain customer demands. In the first stage, the …

Converting Vacant Lots To Parks: Shamokin Survey Results, Matt Mcmullen, Shaunna Barnhart

Student Project Reports

No abstract provided.

A Word From The Writing Team (July 2023), Pam Walter, Mfa, Liz Declan, Ma, Mfa

A Word From the Writing Team (Newsletter)

This issue includes:

• Academic Commons Launches New Website
• Publication Spotlight
• Reminders
• First Friday Writing Retreat Hiatus
• Scott Renovations and You
• MS4 Residency Personal Statement Workshops

Learning By Doing In The Segregated South: The Robert Hungerford Normal And Industrial School For African Americans In Central Florida, Wenxian Zhang

Faculty Publications

The development of the Robert Hungerford Normal and Industrial School is an important chapter in the history of African American education in Florida. Through careful examinations of the school publications, records, archival correspondence, and newspaper clippings, the article seeks to document the history of the Hungerford School from its founding in the late nineteenth century until it became a public school in the Orange County, Florida in the early 1950s. Following Booker T. Washington’s ideals, the school was established with a great emphasis on economic self-help and individual advancement for African Americans. Its mission was to teach vocational skills to …

The Project‑Partnership Cycle: Managing City‑University Partnerships For Urban Sustainability And Resilience Transformations, Liliana Elizabeth Caughman, Fletcher Beaudoin, Lauren Withycombe Keeler

Institute for Sustainable Solutions Publications and Presentations

Cities across the globe are striving to produce viable solutions to pressing urban sustainability and resilience problems. Despite aspirations, municipal governments often need additional support in terms of knowledge, capacity, or resources to achieve transformations. Partnerships between cities and universities are one mechanism for co-producing knowledge and achieving sustained progress on complex challenges. When properly structured and effectively managed, city-university partnerships (CUPs) are purported to increase transformative capacity in city administrations and support actions which accelerate urban transformations; but these outcomes are not always achieved. As CUPs grow in numbers, there is a pressing need to identify which principles and …

Power, Patronage, And The Local State In Ghana, Barry Driscoll

Ohio University Press Open Access Books

How have the waves of democracy and decentralization that swept the developing world in recent decades affected states—among the most important drivers of poverty and prosperity—at national and local levels in Ghana and beyond?

State actors beneath the national level—what Barry Driscoll calls the local state—have considerable responsibility for carrying out state functions, but they are also forced to compete for these local state offices. How does a local state actually work in poor twentieth-century countries?

This book offers a descriptive account, as well as a causal explanation, of how political competition affects the local state in Ghana. Driscoll shows …

Better Days: A Minority Student’S Pathway Toward Upward Social Mobility, Brandi Nichole Anderson

Theses and Dissertations

In the United States, many minority group members have lower social status and fewer economic resources than whites. In order to advance their social status, these individuals set goals that provide them access to more economic capital, many of which include obtaining a college degree. It must also be noted, however, that minority individuals, particularly those of African American and Hispanic descent, possess many alternative types of social and cultural capital that assist them in achieving their goals (Strayhorn, 2010). This qualitative study, designed to explore the types of cultural capital minority students use to achieve their career goals, analyzes …

One Training Is Not Enough: The Effects Of A Cultural Humility Training On Mentors’ Verbal Behavior, Anna Flitner

Theses and Dissertations

Youth mentoring has been used as a method of prevention and intervention related to social, psychological, and academic outcomes for youth and adolescents, many of whom come from minoritized or low SES backgrounds. Although more diverse than other helping professions, mentors in formal programs are often white which can lead to potential cultural incongruence. To help mentors understand their own identities and work with youth of diverse backgrounds, mentoring programs have begun implementing cultural humility trainings. The current study examines the effects of a cultural humility training in mentoring. Mentors were randomly assigned to the control or training condition in …

Contextualizing Search: An Analysis Of The Impacts Of Construal Level Theory, Mood, And Product Type On Search Engine Activity, Jackson Everitt Carter

Theses and Dissertations

This dissertation explores the world of search from the human perspective. While search engine research, both corporate and academic, has seen a growth in relevance in recent years, the relative novelty of the area in the advertising world means that many important questions remain unanswered. This work aims to expand the current state of search engine research by examining the combined impact of mood, construal level theory applications, and product type on search behavior. Additionally, this research seeks to examine psychophysiological responses from these interreacting frameworks using webcam eye-tracking technology, which was developed recently and has not been previously used …

Comorbid Adhd And Pediatric Sickle Cell Disease: Prevalence And Risk Factors, Sarah Bills

Theses and Dissertations

Objective: Sickle cell disease (SCD) is a genetic blood condition that places youth at increased risk for deficits in attention and executive functioning suggestive of increased rates of Attention Deficit/Hyperactivity Disorder (ADHD). There is pronounced inconsistency in reported prevalence rates for attention deficits and ADHD diagnoses among youth with SCD, which is due in part to variability in methodology of previous studies. The primary aim of the present study is to use systematic screening to identify the prevalence of inattentive ADHD symptoms and ADHD diagnoses in a pediatric SCD population seen at a large hematology clinic. A secondary aim is …

An Examination Of Sustained Attention During Complex Multitasking Scenarios, Jonathan Cheshire Rann

Theses and Dissertations

This dissertation project examined the time-course of vigilance decrements that occur when operators perform demanding multitasking activities. For this aim, we conducted three experiments which implemented a novel paradigm we developed that measured performance during two sessions: a Single-Task session in which participants performed a go-no-go target detection task in the absence of any other task for approximately 12 minutes; and a Multi-Task session in which participants performed the detection task simultaneously with a driving-based tracking task for the same duration. A total of 183 participants from the University of South Carolina Department of Psychology took part in this study. …

Exploring The Agenda-Setting Dynamics Between Traditional Newspapers And Twitter During Mass Shooting Event, Yujin Heo

Theses and Dissertations

The purpose of this dissertation is to explore the intermedia agenda-setting interplay between traditional news media and Twitter in the wake of mass shooting incidents. Applying Latent Dirichlet Allocation (LDA) topic modeling to data sourced from Twitter, national, and local news, the study investigated the distinct coverage patterns and the extent of their reciprocal influence over time. The findings of this study demonstrated that, in the immediate aftermath of a shooting incident, national news outlets exerted a significant agenda-setting influence on both local media and Twitter discourse. However, as time unfolds, a mutually influential dynamic emerged across all media platforms. …

Framing Police Brutality: An Analysis Of Newspaper Coverage Of Walter Scott’S Murder, Shamira S. Mccray

Theses and Dissertations

This research analyzes news articles about the killing of Walter Scott in 2015 to determine how frames changed over time and across platforms. Previous studies have found that news coverage of police violence against Black men has not always been fair. Instead, the narrative of official sources, like law enforcement, prove dominant. These same research articles typically focus on the way national news outlets frame incidents like Scott’s.

But this thesis takes a deeper look at how state newspapers framed Scott’s murder. I analyzed the frames and sources found in nearly 200 articles published by The Post and Courier and …

Sentiment Analysis Of Swedish And Finnish Twitter Users’ Views Toward Nato Pre- And Post- 2022 2nd Russian Invasion Of Ukraine, Alexander Scott Fulham

Theses and Dissertations

This study seeks to analyze the changes in Swedes’ and Finns’ opinions toward the North Atlantic Treaty Organization (NATO) in light of the 2022 2nd Russian Invasion of Ukraine. To do so, a large dataset of geotagged tweets containing keywords related to NATO is analyzed using lexicon-based sentiment analysis to study spatiotemporal trends. The study shows that overall discussion remains very neutral, with less than a quarter of all tweets having a non-zero sentiment score, and differs markedly from public opinion polling in both countries while spatiotemporally, the discussions is concentrated in the major population centers and exhibits little month …

Feasibility Of A Parent-Focused, Stress Management Intervention To Decrease Adolescent Bmi, Reduce Stress, And Increase Well-Being Among African American Families, Colby J. Kipp

Theses and Dissertations

African American adolescents in the United States experience a higher prevalence of obesity as compared to their White counterparts. This health inequity presents a public health concern as consequences of weight-related chronic diseases often persist into adulthood and are increasingly problematic. As chronic stress has been found to be higher among African American youth compared to White adolescents, it presents as a potential barrier to participation for African American families in health promotion interventions. Additionally, it may be beneficial to target stress in health promotion programs as a modifiable factor in conjunction with health behaviors that may improve outcomes related …

Neural Mechanisms Of Lexical Semantics: Investigating The Roles Of Hubs And Distributed Action-Perception Systems, Nicholas Andrew Riccardi

Theses and Dissertations

Understanding the meaning of words and concepts is vital for communication, forming relationships, and navigating everyday life. Loss of this knowledge through brain damage can have drastic consequences for one’s health and well-being. It is therefore important to learn how this information is organized anatomically in the brain. In this dissertation, I report a series of structural and functional neuroimaging studies in healthy adults and survivors of stroke seeking to understand how lexical semantics are represented. Specifically, I used a variety of tasks to examine the contributions of putative ‘hubs’ and distributed action-perception systems. Results indicated that damage or disruption …

Meet Me In The Middle: A Scoping Review On Understanding Adolescent Needs In Climate Communication, Gwendolyn Monica Hoff Anderson

Master's Projects and Capstones

The greatest effects of climate change are likely to be felt by youth. Young people are disproportionately affected by climate change due to their critical developmental stage and lack of power, and they experience both higher severity and prevalence of mental health issues related to climate change. Strong emotions have long been recognized as potential catalysts for action, or they may lead to paralyzing feelings of being overwhelmed. Climate communication is a critical tool to spark climate concern and encourage action. Activism, in turn, may help youth manage their anxiety about climate change. This scoping review examines emerging evidence on …

Investment And The Long Swings Of Unemployment, Hian Teck Hoon, Margarita Katsimi, Gylfi Zoega

Research Collection School Of Economics

We estimate the medium-term relationship between investment and unemployment over the period 1960–2017 in 20 OECD countries, a period that includes the years of the Great Recession. While neoclassical growth theory typically assumes full employment—with no effect of investment on unemployment—and New-Keynesian models assume that such a relationship only exists in the short term at business cycle frequencies, we find that over our sample period covering more than 5 decades, a statistically significant negative relationship does exist: in decades when investment fell, unemployment increased. Panel estimation, using a measure of stock market volatility as an instrument for investment, confirms the …