Large Fall Research Articles

PENGARUH TEKANAN AIR DAN SUDUT NOZZLE TERHADAP KARAKTERISTIK OUTPUT PADA PROTOTYPE PLTMH DENGAN TURBIN PELTON

Pelton turbine is an impulse turbine that is different from other turbines where the peltonturbine utilizes a large high water fall (head), even with a small water discharge. The problemwith Pelton turbine is that the head is still difficult to control because this type of turbine uses ahigh head to rotate the turbine runner and there is no formula / equation to determine the angleof the nozzle which produces maximum output. Based on the problems described, it isnecessary to make a micro hidro power plant prototype using a pelton turbine with a laboratoryscale so that it can do the testing of the influence of water and the nozzle angle to obtainmaximum output results on a micro hidro power plant using a pelton turbine. The prototypetesting in this study used various water pressures, namely 5 psi, 9 psi, 13 psi, 17 psi, 21 psi,and 25 psi with nozzle angles, namely 60º, 75º, and 90º. Based on the results of the study, anincrease in the value of water pressure provided with an optimal nozzle angle will cause themicro hidro power plant performance to increase. The maximum output obtained is when thewater pressure is 25 psi with a nozzle angle of 90º which produces a turbine rotation of 917 rpmbefore the generator is coupled and 326 rpm after the generator is coupled, the generatorrotation is 1321 rpm, the generator voltage is 12.9 Volts, generator power is 30.96 Watt, torque is 0.98 Nm, and the highest efficiency occurs when the water pressure is 21 psi with a nozzleangle of 90º which is 3.91%.

Gender inequality and the COVID-19 crisis: Evidence from a large national survey during South Africa’s lockdown

We analyse the early effects of the COVID-19 crisis and lockdown in South Africa on women’s and men’s work in the paid and unpaid (care) economies. Because women and men typically have different roles in both spheres, it is likely that they would experience the negative effects of the crisis unevenly, potentially exacerbating existing inequalities. Based on a large national survey conducted during South Africa’s lockdown period, we find that women have been affected disproportionately by the crisis. While women comprised less than half of the employed in February, they experienced two-thirds of the net job losses between February and April, with the most vulnerable groups affected more. Among those who remained in employment, there was a larger fall in working hours among women than men. Compounding these disproportionate effects in the labour market, women also took on more of the additional childcare that resulted following school closures. The crisis has therefore increased gender inequality in South Africa, reversing some of the hard-won gains of the previous 25 years.

EVALUASI JARINGAN TENGANGAN MENENGAH PASCA BENCANA DI KABUPATEN HALMAHERA SELATAN

This study looked at the condition of power loss and falling voltage after the evaluation of the medium voltage network 20 kV after the earthquake disaster in South Halmahera district, especially in labuha extension on Bacan island The method used in this study is a quantitative research method with data collection done which is then simulated using ETAP 12.6 software. The simulation result obtained total power loss at Labuha extension is 44.3 kW + 66.8 kVAR or 80,154 kVA of 2,445 MVA delivery power, while the presentation of power loss is 3.278%, this is still considered feasible because the power loss on the medium voltage network 20 kV is 10% while in Labuha turtles the power loss is less than 10%. While the large fall in voltage at the largest Labuha extension at the Belang-Belang distribution substation is 3.96% or 792 volts, this is due to the channel length and presentation of the load reaching 83% against the distribution tranformator and the fall in the average voltage of Labuha's purgator is 3.025% or 605 volts against the nominal voltage of 20 kV. It is still considered viable for operation due to the permitted voltage fall on the 20 kV medium voltage network which is 5%.

Enzyme digestion of biofiber from mechanical heat treated municipal solid waste: Accessing kinetic and rheological design data using a pilot-scale high-solids mixer

Mechanical heat treatment of municipal solid waste offers a route for the production and separation of a biofiber fraction with high organic content, which is a potential source of sugars for biochemical conversion to chemicals and fuels. This paper describes a study of the enzymatic digestion of this biofiber fraction using a 50L commercial vertical mixer, applying a commercial cellulase. Power measurements, with calibration of mixer constants using standard Newtonian and non-Newtonian fluids were used to determine apparent viscosity of biofiber mixtures, effective shear rate and Reynolds and Power Numbers. Measurements could be easily carried out at high solids contents, >25% dry weight, where initial biofiber mixtures had high viscosity, typically 100–150 Pa S, with strong shear thinning behavior. Microscopy showed that the biofiber contained many individual wood and other plant fibers, which would entangle and so resist shear forces. Partial alignment of these fibers would be responsible for the shear-thinning effect. The fibers were repeatedly cut and reduced in length as a result of enzymatic hydrolysis, responsible for the large fall in viscosity during digestion. The viscosity of the biofiber slurries were monitored up to 48 h digestion time, with analysis of samples to determine sugar monomer content. Digestion kinetics were analyzed using an exponential recovery model, where glucose yields of around 35% were found for digestion of a biofiber derived from standard and also high paper MSW mixtures. Further yield optimization would be required to achieve commercial viability.

Fiscal Policy in an Age of Secular Stagnation.

An on-going period of secular stagnation in advanced economies has brought down interest rates, growth rates and inflation. Due to the relatively larger fall in interest rates, the differential between the interest rate paid on government debt and the output growth rate (IRGD) became lower and has even turned negative in most advanced economies. In such an environment, public debt may come at much lower (or even no) cost. Thus, if this pattern remains stable, it has important implications on the role of fiscal policy. Against this background, this paper discusses relevant long-term trends in Europe and aims to explain the currently low IRGD. Furthermore, it investigates possible future IRGD paths and its consequences for fiscal policy.

Lactate Attenuates Synaptic Transmission and Affects Brain Rhythms Featuring High Energy Expenditure.

SummaryLactate shuttled from blood, astrocytes, and/or oligodendrocytes may serve as the major glucose alternative in brain energy metabolism. However, its effectiveness in fueling neuronal information processing underlying complex cortex functions like perception and memory is unclear. We show that sole lactate disturbs electrical gamma and theta-gamma oscillations in hippocampal networks by either attenuation or neural bursts. Bursting is suppressed by elevating the glucose fraction in substrate supply. By contrast, lactate does not affect electrical sharp wave-ripple activity featuring lower energy use. Lactate increases the oxygen consumption during the network states, reflecting enhanced oxidative ATP synthesis in mitochondria. Finally, lactate attenuates synaptic transmission in excitatory pyramidal cells and fast-spiking, inhibitory interneurons by reduced neurotransmitter release from presynaptic terminals, whereas action potential generation in the axon is regular. In conclusion, sole lactate is less effective and potentially harmful during gamma-band rhythms by omitting obligatory ATP delivery through fast glycolysis at the synapse.

Is Fertility a Leading Economic Indicator?

Abstract Many papers show that aggregate fertility is pro-cyclical over the business cycle. Using data on more than 100 million births from 1988 to 2014, we show that for recent recessions in the United States, there is a large and rapid fall in the growth rate of conceptions several quarters prior to economic decline. This newly emerging pattern appears in the aggregate data, as well as within individual states and in many European countries. Our findings suggest that fertility behaviour is more forward looking and sensitive to changes in short-run expectations about the economy than previously thought.

Falls in Veterans Healthcare Administration Hospitals: Prevalence and Trends.

To provide up-to-date data on fall prevalence and trends in Veterans Health Administration (VHA) hospitals. Data were collected by the VHA Inpatient Evaluation Center (IPEC) between 2011 and 2017, to establish prevalence and trends of falls and major injuries occurring in acute care/intensive care units (AC/ICU), behavior health (BH), and community living center (CLC)/long-term care, using bed days of care (BDOC) as denominators. A total of 204,681 falls were reported (rate = 4.8 falls/1,000 BDOC) during the study period, of which 2,549 (1.2%) resulted in a major injury (rate = 6.0/100,000 BDOC). Fall rates decreased over the 6-year study period for all unit types: 10% decrease for BH (p < .0001), 9% decrease for AC/ICU (p < .0001), and 3% decrease for CLC (p = .0043). Major injury rates remained consistent. In this large descriptive study, fall and major injury rates varied by nursing unit type in VHA hospitals. Over the 6-year study period, a clinically and statistically significant decrease in fall rates for BH and AC/ICU units was observed as well as a small but statistically significant decrease in fall rates for CLC units. No trend was observed for major injury rates.

Fitting Precipitation Particle Size–Velocity Data to Mixed Joint Probability Density Function with an Expectation Maximization Algorithm

AbstractThis paper proposes an estimation method of joint size and terminal velocity distribution on the basis of sampling data of precipitation particles containing multiple types. Assuming that the velocity follows the normal distribution and the size follows the gamma distribution, the method searches a locally maximum logarithmic likelihood within a realistic parameter range using the expectation–maximization algorithm. Several test populations were prepared with a realistic number of elements, and then the method was evaluated by retrieving the populations from their sample. The results showed that the original parameters were successfully estimated in most cases of the test population containing some of liquids, graupels, and rimed and unrimed aggregates. The original number of elements was also estimated with an adjustment of the number of elements in a manner such that each of their minority fractions exceeded a threshold. Applied to the two-dimensional disdrometer observation data, the method was helpful to discard frequently observed erroneous data with unrealistically large fall velocity.

The Role of Group III/IV Muscle Afferents in Regulating the Hemodynamic Response to Whole Body Exercise

BACKGROUNDGroup III/IV muscle afferents respond to mechanical and chemical stimuli occurring in skeletal muscle during exercise and contribute, via their feedback to cardiovascular control centers in the brainstem, to the circulatory response to physical activity. In healthy young individuals, feedback from these afferents facilitates leg blood flow during dynamic knee extensor exercise. However, their exact role in determining peripheral hemodynamics during whole body exercise (large active muscle mass), which is characterized by larger sympathetically‐mediated vasoconstriction compared to knee extensor exercise (small active muscle mass), has yet to be investigated.METHODSSeparated by 2 h of rest, 4 healthy males (Age 21 ± 2 yrs) completed 3 bouts of cycling exercise [75 W: ~45% of VO2max, 100 W: ~55% VO2max, and 80% of peak power output (226 ± 12 W): ~95% VO2max] under both control conditions (CTRL) and with lumbar intrathecal fentanyl (FENT) blocking μ‐opioid receptor‐sensitive muscle afferents. To avoid different respiratory muscle metaboreflex and/or chemoreflex effects on leg vascular conductance (LVC) and blood flow, subjects’ breathing during FENT (usually characterized by hypoventilation and asphyxia) was guided to achieve end‐tidal PCO2 (PETCO2) to be similar to that in CTRL. Femoral arterial blood flow (QL; Doppler Ultrasound), heart rate (HR), cardiac output (CO), and leg perfusion pressure (PP; intravascular catheter, arterial – venous blood pressure) were continuously determined, femoral arterial and venous blood samples were collected during the final minute of each workload.RESULTSThere were no hemodynamic differences between conditions at rest. Arterial blood gases, breathing, and PETCO2 were, per design, not different between conditions. During FENT exercise, PP was, compared to CTRL, significantly lower at all intensities (up to 26%). Without affecting HR (P &gt; 0.2), CO was significantly lower during FENT compared to CTRL at 75 W and 100 W (up to 25%), but not at 80% Wpeak. QL was, however, not different between conditions (P = 0.69) as leg vascular conductance was up to 33% higher during FENT compared to CTRL (P &lt; 0.05). Arterial O2 content, leg O2 delivery, and leg VO2 were similar between conditions (P &gt; 0.3).CONCLUSIONThe current findings obtained from humans during leg cycling suggest that group III/IV‐mediated afferent feedback from locomotor muscle facilitates leg perfusion pressure and CO, but restricts leg vascular conductance during whole body exercise. These effects of group III/IV muscle afferents are likely secondary to their role in regulating the autonomic control of the heart and the vasculature. Interestingly, the effect of these sensory neurons on leg vascular conductance differs between exercise characterized by large vs small active muscle mass. While afferent blockade increases leg vascular conductance (with no changes in QL, but decreases in PP) during cycling exercise, it decreases leg vascular conductance (relatively larger fall in QL compared to fall in PP) during knee extensor exercise.Support or Funding InformationNational Heart, Lung, and Blood Institute (HL‐116579)

The Cost of Job Loss

Abstract This article identifies an equilibrium theory of wage formation and endogenous quit turnover in a labour market with on-the-job search, where risk averse workers accumulate human capital through learning-by-doing and lose skills while unemployed. Optimal contracting implies the wage paid increases with experience and tenure. Indirect inference using German data determines the deep parameters of the model. The estimated model not only reproduces the large and persistent fall in wages and earnings following job loss, a new structural decomposition finds foregone human capital accumulation (while unemployed) is the worker’s major cost of job loss.

Domestic and international impacts of the rice trade policy reform in the Philippines

Faced with high domestic rice prices that have fueled inflation above the 2018 target and penalized poor consumers the most, the government of the Philippines has decided to abandon the quantitative restrictions on imports and replace them with tariffs. This paper uses a global rice model based on a partial equilibrium framework to assess the possible impacts of this reform on imports, production, consumption and prices. In contrast with past similar studies, we address three key concerns (i) the heterogeneity in farm price across 16 regions in response to the combined effect of the tarriffication and the average historical trend in productivity increase at 1.5% between 2001 and 2018, (ii) the differentiation of imports by origin partly due to the different tariffs applied to countries within and beyond the Association of South East Asian Nations, and (iii) the effect on domestic prices in third countries. The simulation results suggest that the reform would increase imports by 2.47 million tons (20.7%) in 2019. We also find a large decline in farm prices and retail prices respectively by PhP 6.1/kg (30.1%) and PhP 7.6/kg (17.4%) in 2019 that explains an increase in rice consumption. We estimate the fall in total inflation at 1.2% in 2019 but less over time. Further, the large fall in farm prices in 2019 is shared quite evenly among regions in the short term but returns to pre-reform levels in the near term. Using a higher price elasticity of supply for one region obtained from panel data surveys, we show a more pronounced decline in production than the national average. Such differentiated results confirm the relevance of using a regionally disaggregated model to design more targeted policies. We also show a slight increase in world prices, which led to small increases in the domestic prices of South and Southeast Asian rice markets. While this reform is largely pro-poor consumers, policy makers would need to use the additional tariff revenue to help rice growers either increase their competitiveness and modernize their rice production or shift to other crops.

Quality of contact counts: The development of interprofessional identity in first year students

BackgroundLittle is known about how nursing and other healthcare students develop professional and interprofessional identities. ObjectivesThis study a) measures changes in students' professional and interprofessional identities between the start and end of a faculty-wide interprofessional first year programme, and b) identifies factors influencing interprofessional identity strength at the end of the programme. ParticipantsOne hundred and eight first year nursing, medicine and allied health students. MethodsA single-group pre-post-test design was used. Students completed an online survey at the start and end of the year-long programme. The survey comprised measures of professional and interprofessional identity, stereotypes, contact and demographics. The same survey was used twice. ResultsThere was a small decline in professional identity and a large decline in interprofessional identity across the year. Nursing students, the only group involved in clinical practicums, were exempt from the large fall in interprofessional identity. Quality of contact with students from other professions and autostereotypes about own profession were predictors of interprofessional identity strength at the end of the programme, consistent with intergroup contact theory. ConclusionsIntroductory interprofessional education programmes should include opportunities for quality contact with students from other professions, and for students to develop a clear understanding of their own profession.

162 Walking, Thinking and Daily-Life Activity in Older People with Dementia

Abstract Gait has been linked with cognition in cognitively healthy and impaired older people. However, the studies in cognitively impaired people have been small, have not contrasted the strength of cognitive domain associations and have reported inconsistent findings. We examined baseline data of 309 older people with mild-moderate cognitive impairment (age 82±6 years; 47% female) who were participating in a large fall prevention randomised controlled trial. Gait speed was measured at usual pace over 2.4m and cognitive performance was assessed with the Addenbrooke’s Cognitive Examination-III (ACE-III). The ACE-III assesses cognitive domain performance (attention; memory; verbal fluency; language; visuospatial ability). Executive function (EF) was additionally examined using the Frontal Assessment Battery (FAB). Each cognitive domain was associated with gait speed in separate models adjusted for confounders. EF (verbal fluency and the FAB) demonstrated the strongest association which withstood adjustment for attention, memory, language and visuospatial ability. In contrast, visuospatial ability was the only cognitive domain to withstand adjustment for EF (verbal fluency, not the FAB). These findings support higher-order gait regulation. Characterising individuals at risk of negative health outcomes can assist in identifying effective prevention strategies. Forty-five older people with mild-moderate dementia were age-sex matched to two (n=90) healthy controls and all participants (age 81±6 years, 42% female) wore triaxial accelerometers (MoveMonitor, McRoberts) on their lower back for 7-days. Daily-life gait quantity and quality were estimated from the MoveMonitor. Steady-state clinical walking speed was assessed at usual pace over 2.4 to 10.0m. Participants with dementia had reduced gait quantity, slower clinical, habitual daily-life and maximum daily-life walking speeds and multi-domain gait impairment compared to controls. In participants with dementia, clinical walking speed more closely represented habitual daily-life walking speed, whereas in controls, it more closely represented maximum daily-life walking speed. These findings have assessment, functional (e.g. crossing roads) and training/treatment implications.

Variation in blood pressure and long-term risk of dementia: A population-based cohort study.

BackgroundVariation in blood pressure may relate to dementia risk via autonomic disturbance or hemodynamic mechanisms, but the long-term associations are unclear. We aimed to determine whether blood pressure variation over a period of years, considering both magnitude and direction, is associated with the risk of dementia.Methods and findingsIn a prospective cohort study ongoing since 1989 in the Netherlands, 5,273 dementia-free participants (58.1% women; mean [SD] age, 67.6 [8.0] years) were included. As of 2016, 1,059 dementia cases occurred during a median follow-up of 14.6 years. Absolute variation in systolic blood pressure (SBP) was assessed as the absolute difference in SBP divided by the mean over two sequential visits every 4.2 (median) years, with the first quantile set as the reference level. The direction was the rise or fall in SBP, with the third quantile set as the reference level. We estimated the risk of dementia in relation to SBP variation measured at different time windows (i.e., at least 0, 5, 10, and 15 years) prior to dementia diagnosis, with adjustments for age, sex, education, apolipoprotein E (APOE) genotype, vascular risk factors, and history of cardiovascular disease. We repeated the above analysis for variation in diastolic blood pressure (DBP).A large SBP variation was associated with an increased dementia risk, which became more pronounced with longer intervals between the assessment of SBP variation and the diagnosis of dementia. The hazard ratio (HR) associated with large variation (the highest quintile) increased from 1.08 (95% confidence interval [CI] 0.88–1.34, P = 0.337) for risk within 5 years of SBP variation measurement to 3.13 (95% CI 2.05–4.77; P < 0.001) for risk after at least 15 years since the measurement of SBP variation. The increased long-term risk was associated with both large rises (HR for the highest quintile, 3.31 [95% CI 2.11–5.18], P < 0.001) and large falls in SBP (HR for the lowest quintile, 2.20 [95% CI 1.33–3.63], P = 0.002), whereas the higher short-term risk was only associated with large falls in SBP (HR, 1.21 [95% CI 1.00–1.48], P = 0.017). Similar findings were observed for variation in DBP. Despite our assessment of major confounders, potential residual confounding is possible, and the findings on blood pressure variability over periods of years may not be generalizable to variability over periods of days and other shorter periods.ConclusionsResults of this study showed that a large blood pressure variation over a period of years was associated with an increased long-term risk of dementia. The association between blood pressure variation and dementia appears most pronounced when this variation occurred long before the diagnosis. An elevated long-term risk of dementia was observed with both a large rise and fall in blood pressure.

Mobile Learning Challenges and Capabilities

Out of a 6 billion-total populace, more than 1.8 billion cell phones are being used. Over the previous decade, there has been a quick improvement in cell phone innovation from straightforward Phones to the most recent age cutting edge telephones which are multifaceted and go about as PDA, phone, camera, minicomputer, and can likewise move various media documents. There is a steady development towards new innovation in cell phone advertise . M-learning is the procurement of any information or ability through utilizing portable innovation, anyplace, whereever. M-learning happens continually, even away from work environments and study halls. Music, radio news, or sports projects are individuals' primary decisions when returning from school or work. After arriving at home, a cell phone is their most ideal method for learning. M-learning doesn't try to supplant conventional adapting yet empower it to utilize new innovation and improve. This paper intends to demonstrate the focal points just as the detriments of M-(Mobile) Learning which by and large fall into: Psychological, Pedagogical, and Technical impediments.

Observed Impacts of Anthropogenic Climate Change on Wildfire in California

AbstractRecent fire seasons have fueled intense speculation regarding the effect of anthropogenic climate change on wildfire in western North America and especially in California. During 1972–2018, California experienced a fivefold increase in annual burned area, mainly due to more than an eightfold increase in summer forest‐fire extent. Increased summer forest‐fire area very likely occurred due to increased atmospheric aridity caused by warming. Since the early 1970s, warm‐season days warmed by approximately 1.4 °C as part of a centennial warming trend, significantly increasing the atmospheric vapor pressure deficit (VPD). These trends are consistent with anthropogenic trends simulated by climate models. The response of summer forest‐fire area to VPD is exponential, meaning that warming has grown increasingly impactful. Robust interannual relationships between VPD and summer forest‐fire area strongly suggest that nearly all of the increase in summer forest‐fire area during 1972–2018 was driven by increased VPD. Climate change effects on summer wildfire were less evident in nonforested lands. In fall, wind events and delayed onset of winter precipitation are the dominant promoters of wildfire. While these variables did not change much over the past century, background warming and consequent fuel drying is increasingly enhancing the potential for large fall wildfires. Among the many processes important to California's diverse fire regimes, warming‐driven fuel drying is the clearest link between anthropogenic climate change and increased California wildfire activity to date.

Monetary Policy and Household Deleveraging

This study investigates the interrelation between the household leverage cycle, collateral constraints, and monetary policy. Using data on the U.S. economy, we find that a contractionary monetary policy shock leads to a large and significant fall in economic activity during periods of household deleveraging. In contrast, monetary policy shocks only have insignificant effects during a household leveraging state. These results are robust to alternative definitions of leveraging and deleveraging periods, different ways of identifying monetary policy shocks, controlling for the state of the business cycle, the level of households debt, and financial stress. To provide a structural interpretation for these empirical findings, we estimate a monetary DSGE model with financial frictions and occasionally binding collateral constraints. The model estimates reveal that household deleveraging periods in the data on average coincide with periods of binding collateral constraints whereas constraints tend to turn slack during leveraging episodes. Moreover, the model produces an amplification of monetary policy shocks that is quantitatively comparable to our empirical estimates. These findings indicate that the state-dependent tightness of collateral constraints accounts for the asymmetric effects of monetary policy across the household leverage cycle as found in the data.

Association of Platelet Counts with Outcome of ICU Stay

Background: Low platelet count is common in intensive care unit (ICU). Thrombocytopenia has also been associated with poor outcome in ICU.1-4 There is sketchy data regarding thrombocytopenia and its effect on outcome from ICUs in India.5 We aimed to study association of platelet counts with outcome of ICU stay. Subjects and Methods: This was a retrospective study. This study was carried out in patients admitted with a diagnosis of sepsis in the medical ICU, Sepsis was defined using the criteria laid down in the surviving sepsis guidelines 2012.6 Data regarding demography (age and sex), probable source of sepsis, platelet count at admission (Plat-adm), lowest platelet count during the ICU stay (Plat-nadir), platelet fall- defined as Plat-adm – Plat-nadir, APACHE-II score and SOFA score at admission were recorded. Outcome parameters were mortality, length of ICU stay and length of hospital stay. Results: During the study period, a total of 87 patients were admitted in the medical ICU. In 29 patients, criteria of sepsis or outcome of ICU stay were not met, and were excluded from the study. Out of the 48 patients included in the study, 35 patients died and 13 patients survived to transfer out from ICU. Age and sex were similar between them. Data was analyzed for associations. In univariate analysis, there was no association between the platelet counts and disease severity scores, except for Plat-nadir exhibiting a weak negative association with SOFA score at admission (Pearson’s R: - 0.303, p= 0.036). Mortality was associated with platelet fall, APACHE-II and SOFA scores at admission (Table 2). A unit increase in APACHE-II-adm and SOFA-adm, and an increment of 10,000 in Plat-fall, increased the odds ratio (OR) of mortality by 14%, 33% and 21% respectively. Multivariate analysis was carried using logistic regression methodology and none of the aforesaid were associated with mortality. It is notable that platelet fall narrowly missed independent association, p= 0.07. Conclusion: This study demonstrates that patients with larger fall in platelet counts may be at increased risk of dying. Larger, prospective studies are needed to further clarify the association of platelet count with outcome of ICU stay.

Valuing Coastal Habitat–Fishery Linkages under Regulated Open Access

This paper explores how regulation of an open access fishery influences the value of a coastal habitat that serves as breeding and nursery grounds. A model of the fishery supported by a coastal wetland is developed, which includes a quota rule that restricts harvest to a fixed proportion of the current stock. The model is applied to mangrove-dependent shellfish and demersal fisheries in Thailand. The value of the welfare effects associated with a change in a supporting coastal habitat is influenced significantly by whether or not the regulatory quota can adjust in response to these changes. Welfare losses are considerably higher when the quota is fixed as opposed to when it can be adjusted. With the restriction in place, effort cannot change to offset the decline in biomass, and as a result, there is a much larger fall in harvest. In addition, the welfare losses are much larger for the shellfish compared to the demersal fisheries. The analysis illustrates that imposing a regulatory rule on an open access fishery has important implications for valuing any linkage between coastal breeding and nursery habitat and a near-shore fishery.