West Sumatera Research Articles

Description of damage and loss of corn production caused by Spodoptera frugiperda (Lepidoptera Noctuidae) in West Sumatera, Indonesia

Abstract Corn is the second-largest agricultural product after rice in Indonesia. The main problem faced in corn production is pests. This study aims to identify and learn the percentage of damage and lost production by the new invasive pest attack on maize in West Sumatera, Indonesia. The location took place in Padang Pariaman and Solok Districts. A survey was used in this research. The results exposed a severe attack of a new invasive pest, S. frugiperda. This pest was found in Padang Pariaman and Solok Districts. The percentage of damage by S. frugiperda in Padang Pariaman (0.71 larvae population per stem) was higher than in Solok District (0.52 larvae population per stem). Then, the population fluctuation of S. frugiperda in Padang Pariaman District was higher than in Solok district. The correlation between the population of S. frugiperda and the production of maize was carried out by regression analysis. The regression model is logarithmic, with a formula y= 380.87 ln(x) + 28 and a value R2= 1 for Batang Anai Subdistrict, and y = 213.52 ln(x) + 35 and a value R2= 1 for Kampung Dalam Subdistrict, Padang Pariaman. Then a formula y= 474.65ln(x) + 11 with a value R2= 1 for Tanah Garam Subdistrict, Solok, and y= 367.89ln(x) + 12 with a value R2= 1 for Tikalak Subdistrict, Solok. S. frugiperda is a new invasive pest, and the vegetative phase is susceptible to S. frugiperda on maize. This pest can cause lost production. If this pest is controlled too late, it can reduce the production of maize. Therefore, farmers must know the right time to control this pest.

Preface

4th International Interdisciplinary Conference on Green Development in Tropical Regions (4th IICGDTR) “Governance Challenges of Green Development in Tropical Asia” Virtual Conference The Graduate Program – Universitas Andalas, West Sumatera, Indonesia 7 – 8 July 2021 The 4th International Interdisciplinary Conference on Green Development in Tropical Regions (4th IICGDTR) has successfully held virtually on 7 – 8 July 2021 organized by the Graduate Program, Universitas Andalas, West Sumatera, Indonesia.IICGDTR is the biannual international conference on Green Development in Tropical Region (ICGDTR). This 2021 conference is the 4th interdisciplinary ICGDTR which held virtually due to the covid-19 pandemic, with the theme “Governance Challenges of Green Development in Tropical Asia”. The main objective of this international conference is to enhance the discourse and discussion on various aspects of green development in tropical regions, especially on the issue of governance challenges of green development in tropical regions.Since the early 21st century, conventional development strategies have been questioned by various development analysts, especially those concerned with issues and conflicts surrounding its environmental, human and socio-economic impacts. The debate on issues surrounding degradation of natural resources, forest, coastal, and agricultural land, along with understanding climate change, has led to the new proposition of the green development paradigm. The conceptual understanding of the green development paradigm is concerned with the strategy and planning of all aspects including environmental planning, rural and urban planning, regional development planning, agriculture and industrial development planning.The tropical region of Asia, covering South, Southeast, and part of East Asia, is a region with a large population, rich biodiversity, and also high growth. More importantly, this is a culturally rich region. Tropical Region of Asia (TRA) is the most dynamic region and is in a constant effort to balance its development path. Much of the region’s economic growth is supported by the exploitation of common-pool natural resources, i.e., forest, land, water. Agriculture is still a dominant livelihood strategy with very slow technological adoption. But the region also utilizes its ecosystem services for the tourism sector to diversify livelihood. Rural and urban development is still not balanced but instead is urban biased. Unfortunately, housing and settlement development in urban areas sometimes threatens agricultural land.List of Committee is available in this Pdf.

Peer Review Statement

All papers published in this volume have been reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.• Type of peer review: Undefined• Conference submission management system: Morressier• Number of submissions received: 93• Number of submissions sent for review: 53• Number of submissions accepted: 49• Acceptance Rate (Submissions Accepted / Submissions Received × 100): 52.7• Average number of reviews per paper: 6.97• Total number of reviewers involved: 7• Contact person for queries: Name: Yuerlita Email: yuerlita@agr.unand.ac.id Affiliation: Universitas Andalas, West Sumatera, Indonesia

Soil disturbance caused by timber harvesting in a natural forest, West Sumatera Indonesia

Logging operations in natural forests generally use bulldozers. Bulldozers skid logs from the stump site to the landing site. The bulldozer maneuvers in the felling area cause skid trails and soil compaction. Soil compaction is one of the negative impacts of logging operations. The research aim is to analyze the level of soil compaction in various bulldozer skidding intensities after logging operations. The research occurred at a natural forest area in Siberut West Sumatera, Indonesia. The results of the study showed that there was a relationship between skidding intensity and the level of soil bulk density. The more a bulldozer moves at the same skid trail, the higher the soil bulk density. The range of soil bulk density is from 0.82 g cm−3 to 1.31 g cm−3. The bulk density increases markedly after the bulldozer’s first, second, and third passes. After the fourth pass, the bulk density is relatively constant. The porosity of the soil decreases with the increase of the bulk density. On skid trails where the soil is very compact, seeds that fall on skid trails will have difficulty growing well. Requires planting on primary skid trails. Soil damage in the form of soil compaction by bulldozers needs serious attention in the Reduce Impact Logging technique.

Flood Hazard Mitigation at Tarusan Watershed, South Pesisir District, West Sumatera Province

Floods are the most common natural disasters in Indonesia and have enormous potential. This study aims to determine the flood hazard zone and regional arrangement in the Tarusan Watershed, South Pesisir Regency. To determine the flood hazard zone using the GIS approach. The indicators used to determine flood hazard are slope, rainfall, soil type, landform, geology, and land use. Determine the direction of regional arrangement with an Interpretative Structural Modeling (ISM) approach. The results showed that the high flood hazard zone in the Tarusan watershed is about 22% of the total area, the medium index is around 58%, and the low flood hazard index is 20%. The high - hazard zone of flood disasters in the study area is caused by high rainfall and topographic conditions of the Tarusan Watershed. The main priority in the management of flood - hazard areas in the Tarusan Watershed is to find economic alternatives to reduce forest destruction. Increasing the economic value of the community can lead to reduced community activities in carrying out land conversion, especially in forest areas.

The fundamental motor skills and motor coordination performance of children in West Sumatera Province, Indonesia

Background and Study Aims. Good motor coordination is needed to achieve good fundamental motor skills. This study aimed to analyze and describe the relationship between fundamental motor skills and motor coordination performance of elementary school students aged 7 to 9 years old. Material and Methods. The subjects were elementary school students in grades 1, 2, and 3 with a total number of students was 478 (248 male students, and 230 female students) in 8 cities and regencies in West Sumatera, Indonesia. This study used a cross-sectional research design. The fundamental motor skills were examined using the Test of Gross Motor Development-Second Edition. This included assessing locomotor skills (running, galloping, sliding, leaping, hopping, and jumping) and object control skills (striking, catching, throwing, dribbling, rolling, and kicking). Motor coordination performance was assessed by using the Körperkoordinations Test für Kinder including balance beam, moving sideways, jumping sideways, and eye-hand coordination. The data were analyzed by using IBM SPSS statistic version 25. Results. Students in urban areas demonstrated certain levels in Gross Motor Quotients scores, while their counterparts in rural areas achieved marginally higher scores with slightly less variation. In schools where Physical Education teachers were present, students generally scored higher compared to schools without Physical Education teachers, albeit with a bit less variation in the latter. When comparing motor coordination performance, students in urban areas typically outperformed those in rural areas, exhibiting slightly more consistent scores. Similarly, students with access to Physical Education teachers showed better motor coordination performance than those without, though with a somewhat greater range in their scores. A noticeable trend was observed in the Gross Motor Quotients scores of Fundamental Motor Skills, which tended to decrease as age increased. Conversely, students' motor coordination performance generally improved with age. Supporting these observations, the result of the one-sample Kolmogorov-Smirnov test, obtained from Asymp. Sig. (2-tailed), was 0.200 > 0.05. Additionally, the Pearson correlation value between motor coordination performance and fundamental motor skills was 0.633 with a sig value of 0.000, indicating a significant relationship. Conclusions. Based on the study's findings, it is recommended to focus on enhancing motor skill programs for children in rural areas. Schools should invest in Physical Education teachers, especially where they are currently absent, to benefit children. Age-specific programs are needed to address the decline in Gross Motor Quotients with age in children. Regular monitoring and evaluation of these initiatives for children are essential.

Pengaruh Pengelolaan Keuangan Daerah dan Sistem Akuntansi Keuangan Daerah terhadap Kinerja Keuangan Pemerintah: Studi Empiris pada OPD Provinsi Sumatera Barat

This study aims to analyse the influence of regional financial management and regional financial accounting system on government financial performance. The research was conducted at the West Sumatera Province Regional Apparatus Organization. The sampling technique uses purposive sampling. Method Data collection was carried out using a questionnaire. Regression analysis Multiple tests were carried out to test the hypothesis using SPSS 20 with results research shows that regional financial management has a positive effect on government financial performance while the regional financial accounting system does not has an influence on the government's financial performance.

Detection of counterfeiting rice bran using near-infrared reflectance spectroscopy (NIRS)

This study aims to compare rice bran quality from different origins and to differentiate rice bran from rice husk based on the spectrum produced by Near Infrared Reflectance Spectroscopy (NIRS) technology. The rice bran used in this study comes from mills and poultry shops in West Java and Sumatra. This study used husks as an adulteration mixing material in rice bran with mixing levels of 25% rice bran: 75% husk, 50% rice bran: 50% husk, and 75% rice bran: 25% husk. Proximate compositions (water content, ash content, ether extract (EE), crude protein (CP), and crude fiber (CF)) were observed. NIRS spectra were collected using the Buchi NIRCal 5.2 application. The results showed an interaction between provider and origin on rice bran EE, CP, and CF contents. Rice bran provided by the miller had better quality with higher CP (17.3% vs. 12.2%) and lower CF (12.0% vs. 16.6%) content in the West Java origin case and higher EE (16.5% vs. 11.1%) in West Sumatera case. The broad spectra distribution showed the variety of the rice bran quality from the poultry shop. The artificial adulteration spectra confirm the impure rice bran quality from the poultry shop.

The Production Efficiency of Small Medium Enterprises in West Sumatera Province

The purpose of this study is to determine the effect of capital, labor, and resources on the technical efficiency production of SMEs in West Sumatra and to see whether the SMEs production in West Sumatra is technically efficient. The type of data used in this study is panel data for 19 regencies/cities in West Sumatra from 2015 to 2021 using the Stochastic Frontier Analysis (SFA) approach. This research examines production efficiency technically at SMEs in the West Sumatra region. The result of this study indicates that the production factors of capital and resources have a positive and significant effect on the production of SMEs in West Sumatra, while labor has a negative and insignificant effect on the production of SMEs in West Sumatra. The result of the technical efficiency calculation shows that the mean level of technical efficiency of the SMEs production in West Sumatra from 2015 to 2021 is 0.543 or 54.3 percent, which means that production in SMEs is technically inefficient. This research implies that the government can compile regulations and road maps that can increase the productivity of SMEs in the West Sumatra region, and for SMEs to be able to engage more broadly with sustainable programs for production efficiency such as attending training and business guidance, using the rural business credit program from the government, as well as establishing cooperation partners for raw materials with other SMEs.

Biodiversity of Mangrove Brachyuran Crabs of Family Ocypodidae and Sesarmidae in Koto XI Tarusan District, West Sumatera, Indonesia

The Mangrove ecosystem is an ecosystem that is around the edge of the coast and many organisms live in this ecosystem, one of them is crabs. The crabs that are often found are deposit crabs from the Ocypodidae and Sesarmidae families that act as balancers in the mangrove ecosystem. This study aimed to analyze species, diversity, evenness, and dominance in the mangrove vegetation area of Koto XI Tarusan District, West Sumatera, Indonesia. The method used is the descriptive method. The biodiversity of brachyuran crabs’ families, Ocypodidae and Sesarmidae, was analyzed with the Shannon-Wiener index (H’). Four indices were calculated for crabs Ocypodidae and Sesarmidae: species identification, Shannon-wiener (H’) diversity, evenness, and dominance indices. The results showed that there were six species of deposited crabs from the Ocypodidae and Sesarmidae families, namely Uca bellator, U. rosea, Perisesarma eumolpe, P. plicatum, Sarmatium germaimi, and Sesarma curoense. The most abundant species (Di) came from the family Sesarmidae. However, for all stations, diversity (H') has a value that is in the medium category, and evenness (E) is in the high category at each station. The dominance (D) obtained a value categorized as low at each observation station. The condition of environmental parameters in the mangrove vegetation area is included in the category of a good environment. It is still within normal limits for the crabs of the Ocypodidae and Sesarmidae families to live. Two substrate types are found in each observation path: muddy and sandy mud.

The Cytotoxic Activity of Marine Sponge-Derived Fungus Aspergillus nomius NC06 Against HT29 Colon Cancer Cells

The study of natural products from marine-derived fungi has been interesting tense to researchers as drug discovery sources. Marine fungus from West Sumatera, Indonesia repeatedly showed their potential for cytotoxic and antimicrobial activities. This study aims to determine the cytotoxic activity against HT29 colon cancer cells of each fraction of ethyl acetate extracts from Aspergillus nomius NC06 derived from marine sponge Neopetrosia chaliniformis. A. nomius was cultivated with rice as a growth medium and extracted with ethyl acetate solvent and evaporated in vacuo to obtain ethyl acetate extract. Furthermore, the compounds of ethyl acetate extract were separated with the VLC (Vacuum Liquide Chromatography) method. Five fractions were obtained, which further investigated their cytotoxic activity against HT29 colon cancer cells by using an MTT assay. The result showed that fractions I and III were categorized as potential fractions due to their IC50 value of 13.12 ± 0.39 μg/mL and 2.59 ± 0.19 μg/mL, respectively. It was also supported by ANOVA to measure the effect of each concentration (0.1; 1; 10; 100 μg/mL) of each fraction on the viability percentage of HT29 cells with p < 0.005.

Controlling Model For Risk Factors Of Stunting Incident

ABSTRACT
 Stunting is the condition where the children have stunted growth and development refers to weight/age (TB/U). In 2015-2017, there were 19,4%, 18,9% and 21,3% cases in West Sumatra. Pasaman district had the highest percentage of stunting from 19 Cities in West Sumatera, which is 21,1%, 25,7%, and 25% cases. The purpose of this study was to analyze the risk factor control model for stunting in toddlers in the Pasaman district. This study was an observational analytic study with an unmatched case-control design. The subject of this study was the 35 families who had children 12-59 months with stunting cases and another 35 group control in Pasaman district. Data were collected by using a questionnaire to measure stunting risk factors. Data was analyzed by using univariate, bivariate, and multivariate analysis with regression and backward methods. The result of the study showed that “father education level” as a stunting risk factor had a P value=0,048 and “family income” with P value = 0,015, while history of birth weight had a P value of 0,08. The final result (sixth step) showed that the baby's birth weight variable had the odds ratio eβ=31,578 when analyzed simultaneously with another variable (parenting and father’s education level). Conclusion: baby birth weight variable simultaneously with parenting and the father’s educational level affected the incident of stunting in toddlers (eβ=31,578). It is necessary to increase family empowerment to control the cases of stunting related to the nutrition of pregnant mothers by improved child care, parenting in feeding, and increased family income.

Model of Good Governance Principles in Improving the Performance and Quality of Services of Regency/City Population and Civil Registration Services in West Sumatera

Good Governance is the principle that can improve the performance and quality of services at the District/City Population and Civil Registration Service (Disdukcapil) in West Sumatra. This research aims to analyze a model of Good Governance principles that can improve the performance and quality of services for the District/City Disdukcapil in West Sumatra. The principles of Good Governance used in this research consist of accountability, participation, efficiency and effectiveness, transparency, rule of law, and responsiveness. This research uses quantitative methods with Structural Equation Model data analysis techniques. The research sample consisted of 118 respondents who were employees of the Regency/City Disdukcapil in West Sumatra. The findings of the study indicate that implementing the Good Governance principles model can potentially enhance the performance and service quality of the District/City Disdukcapil in West Sumatra. This improvement is attributed to the adherence to key concepts such as accountability, transparency, rule of law, and responsiveness. Simultaneously, the concepts of efficiency, effectiveness, and participation do not substantially influence the performance and service quality of the District/City Disdukcapil in West Sumatera.

Panel Data Spatial Regression Modeling with a Rook Contiguity Weighting Function on the Human Development Index in West Sumatera Province

The achievement of the level of welfare of a region or country can be seen from the level of human development as measured by the Human Development Index (HDI). West Sumatra is one of the provinces with HDI achievements above the national average. However, there are still regencies/cities in West Sumatra Province that have HDI achievements below the national average and HDI achievements in West Sumatra Province Regencies/Cities have changed in 2017-2021. Therefore, in this study, spatial analysis of panel data was used. The aim of this research is to find out the general description of the HDI of West Sumatra Province, obtain a panel data spatial regression model and obtain variables that significantly influence on HDI in West Sumatra Province 2017─2021because differences in HDI achievement were suspected to have influences from areas that were side by side and the area was observed more than once. The model formed from this analysis using the rook contigutiy weighting function is Random Effect Spatial Autoregressive because the spatial interactions formed in human development index data in West Sumatra Province are real at lag. This model is a suitable model based on panel spatial model selection and has an R2 value of 92.94%. Analysis of human development index data in regencies/cities in West Sumatra Province using spatial regression panel data obtained results that expectations of school length (X1), average length of schooling (X2), and population density (X3) significantly directly influenced the human development index in regencies/cities in West Sumatra Province.

Efektivitas Program Kota Tanpa Kumuh (Kotaku) Dalam Menangani Permukiman Kumuh Di Kota Padang

West Sumatera Province is one of the 15 provinces with the highest slum area in Indonesia. The city of Padang, as the largest city and the provincial capital, has a number of slum areas with an area of 122.33 ha. Of the 22 Kelurahan in Padang, one of the widest slum areas is in the Kelurahan Binuang Kampung Dalam. The KOTAKU program is then present to direct and synergize all forms of collaboration between parties to prevent and improve the quality of slum settlements, especially the community as active development subjects. Within two years, the KOTAKU program initiated CFW (Cash For Work) and Sanitation Assistance activities with a total budget of nearly one billion by involving the full participation of the people there. This thesis aims to analyze how effective and the inhibiting factors of the KOTAKU Program are in dealing with slum settlements in Binuang Kampung Dalam Village. This study used a descriptive qualitative approach, and the method of selecting informants used a purposive sampling technique with the method of measuring program effectiveness using the Pentagonal Assets 7 Indicators. The results showed that the implementation of the KOTAKU program in Binuang Kampung Dalam Kelurahan focused on road repairs with a volume of 2,352.4 meters, drainage improvements with a volume of 275.7 meters, community capacity building 1 package, and sanitation improvement assistance to 100 families. However, the KOTAKU program is still considered less effective, because it does not bring changes to the other three indicators. The factors inhibiting the effectiveness of the program are the absence of programs on the indicators of building order, waste management and fire protection and the slow disbursement of funds

Pain Management in the Community: The Empowerment of District on Collaboration of Complementary Nursing at Bukittinggi, West Sumatera

Pain is a global health issue. It is estimated that every year 20% of the world's population experiences pain and half of this is chronic pain. In Indonesia there has been no large-scale research discussing the prevalence and quality of all types of pain. Indonesia also does not yet have practical parameters for assessing pain, patient comfort levels, and the effect of pain on the quality of life of the Indonesian people. This Community Service (PKM) seeks to provide training and raise information about pain treatment in one of the districts of Bukittinggi, West Sumatera, through socializing and outreach to the community. The strategy employed in this PKM includes counseling about pain management in the community and how to handle it. This PKM obtained an increase in the knowledge and skill of community members in controlling their pain. According to the findings of monitoring and analyzing PKM activities, the community health service was ready to improve people's pain management strategies. It is believed that this activity will be beneficial in enhancing the knowledge and experience of pain management that may be used in the community health service by individuals and their families, particularly in non-pharmacological approaches as complementary pain management nursing.

Cross-cultural adaptation and validation of the medical outcome study social support survey among mothers of children aged 6–23 months in Indonesia

BackgroundSocial support significantly influences a mother's adherence to complementary feeding guidelines, with family support fostering a positive attitude towards this practice. The Medical Outcome Study Social Support Survey (MOS-SSS) is a multidimensional scale designed to evaluate functional aspects of social support, but no instrument has been validated for Indonesia. PurposeThe study aims to validate the MOS-SSS instrument for measuring mothers' social support in providing complementary food to infants and young children aged 6–23 months in Indonesia. MethodsA cross-sectional survey was conducted on 196 mothers with children aged 6–23 months in West Sumatera, Indonesia. The MOS-SSS's internal consistency was assessed using Cronbach alpha, composite reliability, and split-half analysis, while its construct validity was evaluated using convergent and discriminant validity. ResultsThe Indonesian version of the MOS-SSS among mothers with children aged 6–23 months has been found to be satisfactory in content validity through translation and expert review. The questionnaire exhibits strong convergent and discriminant validity, reliable construct reliability, and internal consistency. Conclusions and implicationsThe MOS-SSS questionnaire was found to be reliable and valid in measuring the social support mothers perceive in providing complementary feeding to their infants and young children. Future research should explore the psychometric properties of the Indonesian version of the MOS-SSS in various populations, including pregnant women, lactating mothers, and women with special conditions.

Profile of The First Year Student’s Argumentation Skills on General Chemistry Courses at a Public University in West Sumatera: A Preliminary Study

Scientific argumentation is one of the key components of habits of mind, while habits of mind are one dimension of scientific literacy that should be developed in Indonesia. However, the student’s scientific argumentation ability in learning, which has been weak lately, has become a common problem that needs to be solved immediately. The solution can be related to how to evaluate the learning process, construct the problems found in learning, and design learning that can motivate students to argue. This is a descriptive study. It aimed to find out the profile of the early scientific argumentation skills of first-year students who took general chemistry courses at one of the public colleges in West Sumatra. Research instruments consist of four open and semi-closed essay questions. Those were given to 125 chemical education students involved in this study. Data was analyzed by evaluating the students’ written argumentation, which became the research samples by following the Toulmin Argumentation Pattern (TAP), consisting of claim, data, warrant, backing, and rebuttal. The study results show that most students (97.25%) have level 0–3 argumentations skills. While only 2.25% of students have level 4 argumentation skills and 0.5% are at level 5. This means that the early argumentation skills of chemistry students are still low, and only a few students are able to emerge with a rebuttal in the scientific arguments they build. These findings are further used as the basis for designing learning strategies that can improve students’ argumentation skills during the learning process, especially in general chemistry courses, so that their habits of mind and scientific literacy will also increase.

The Development Priorities and Competitiveness of Leading Livestock Commodities in West Sumatera, Indonesia

The Development Priorities and Competitiveness of Leading Livestock Commodities in West Sumatera, Indonesia

Metagenomic analysis and biodiversity of bacteria in traditional fermented fish or Budu from West Sumatera, Indonesia.

This research aims to investigate the microbial diversity of Budu prepared from fresh and frozen fish from the Pariaman and Pasaman districts in West Sumatra Province, Indonesia, as well as provide basic information about Budu quality. To obtain the bacterial microbial composition, deoxyribonucleic acid extraction was carried out using amplicon-sequencing of the 16S-rRNA gene in the V3-V4 region from two types of Budu and carried out in duplicate. Budu prepared with fresh (Pariaman) or frozen (Pasaman) fish was dominated by Firmicutes (78.455%-92.37%) and Proteobacteria (6.477%-7.23%) phyla. The total microbial species in Budu from Pariaman were higher (227 species) than in Pasaman (153 species). The bacterial species found are Lentibacillus kimchi (1.878%-2.21%), Staphylococcus cohnii (0.597%-0.70%), Peptostreptococcus russeli (0.00%-0.002%), Clostridium disporicum (0.073%-0.09%), Clostridium novyi (0.00%-0.01%), Nioella sediminis (0.00%-0.001%), and Shewanella baltica (0.00%-0.003%). Lentibacillus kimchi, S. cohnii, and C. disporicum are found in both Budu. Nioella sediminis and S. baltica are found in Budu Pariaman. Peptostreptococcus russeli and C. novyi were found in Budu Pasaman. Metagenomic analysis of Budu from different fish, Pariaman (fresh fish) and Pasaman (frozen fish) showed that the biodiversity of bacteria was barely different. Both Budu found lactic acid bacteria from the Enterococcaceae family, genus Vagococcus, and pathogenic bacteria, such as S. cohnii, P. russeli, C. disporicum, and S. baltica. The discovery of various species of pathogenic bacteria indicates that development is still needed in the Budu production process to improve Budu quality.