Changes of benthic macroinvertebrates in Thi Vai River and Cai Mep Estuaries under polluted conditions with industrial wastewater

The pollution on the Thi Vai River has been spreading out rapidly over the two lasted decades caused by the wastewater from the industrial parks in the left bank of Thi Vai River and Cai Mep Estuaries. The evaluation of the benthic macroinvertebrate changes was very necessary to identify the consequences of the industrial wastewater on water quality and aquatic ecosystem of Thi Vai River and Cai Mep Estuaries. In this study, the variables of benthic macroinvertebrates and water quality were investigated in Thi Vai River and Cai Mep Estuaries, Southern Vietnam. The monitoring data of benthic macroinvertebrates and water quality parameters covered the period from 1989 to 2015 at 6 sampling sites in Thi Vai River and Cai Mep Estuaries. The basic water quality parameters were also tested including pH, dissolved oxygen (DO), total nitrogen, and total phosphorus. The biodiversity indices of benthic macroinvertebrates were applied for water quality assessment. The results showed that pH ranged from 6.4 – 7.6 during the monitoring. The DO concentrations were in between 0.20 – 6.70 mg/L. The concentrations of total nitrogen and total phosphorous ranged from 0.03 – 5.70 mg/L 0.024 – 1.380 mg/L respectively. Macroinvertebrate community in the study area consisted of 36 species of polychaeta, gastropoda, bivalvia, and crustacea, of which, species of polychaeta were dominant in species number. The benthic macroinvertebartes density ranged from 0 – 2.746 individuals/m2 with the main dominant species of Neanthes caudata, Prionospio malmgreni, Paraprionospio pinnata, Trichochaeta carica, Maldane sarsi, Capitella capitata, Terebellides stroemi, Euditylia polymorpha, Grandidierella lignorum, Apseudes vietnamensis. The biodiversity index values during the monitoring characterized for aquatic environmental conditions of mesotrophic to polytrophic. Besides, species richness positively correlated with DO, total nitrogen, and total phosphorus. The results confirmed the advantage of using benthic macroinvertebrates and their indices for water quality assessment

ENTREPRENEURSHIP EDUCATION, ENTREPRENEURIAL EXPERIENCES, AND CREATIVITY AFFECT ENTREPRENEURIAL INTENTION IN BUSINESS ADMINISTRATION STUDENTS IN TELKOM UNIVERSITY, BANDUNG.

Pengusaha telah berkontribusi banyak tidak hanya untuk ekonomi suatu negara tetapi juga menciptakan banyak perubahan dalam kehidupan orang-orang. Baru-baru ini, kewirausahaan telah menjadi topik yang sedang hangat dibahas oleh akademisi, pengusaha, dan pemerintah di Indonesia. Ada begitu banyak penelitian tentang kewirausahaan dalam hal karakteristik pribadi, motivasi pribadi, perilaku yang direncanakan, dll. Namun, faktor-faktor yang memutuskan keputusan seseorang untuk memulai usaha masih belum sepenuhnya diketahui. Oleh karena itu, tujuan dari penelitian ini adalah untuk menguji apakah pendidikan kewirausahaan, pengalaman kewirausahaan, dan kreativitas mempengaruhi niat kewirausahaan dengan menggunakan metode deskriptif kualitatif, regresi berganda, ANOVA, uji parsial, dan simultan. Hasil dari 266 mahasiswa Administrasi Bisnis angkatan 2015 dan 2016 di Universitas Telkom ditemukan bahwa pendidikan kewirausahaan mempengaruhi keinginan siswa untuk menjadi wirausaha, sementara pengalaman tidak tampak menjadi penentu pengaruh. Di sisi lain, kreativitas sangat mempengaruhi siswa dalam mengejar kegiatan kewirausahaan. Kreativitas sangat terlibat dalam niat kewirausahaan dan siswa yang telah terlibat dalam mata kuliah Kewirausahaan memiliki niat yang lebih tinggi untuk memulai usaha baru. Oleh karena itu, Program Administrasi Bisnis perlu meningkatkan kwalitas mata kuliah kewirausahaan dan kreativitas & Inovasi. Kata Kunci: Kreativitas, Niat Berwirausaha, Pendidikan Kewirausahaan, Pengalaman Wirausaha

COLLECTIVE RISK ADAPTATION TO SALINE INTRUSION: A CASE IN THE VIETNAM MEKONG DELTA

Saline intrusion causes serious risks for agriculture and social life in the Vietnamese Mekong Delta. Maintaining and improving coastal livelihoods under the challenging condition of scarcity of fresh-water places greater pressures for rural societies. This dissertation explores saline water intrusion status, its trend and its impact on the livelihoods of coastal farmers in order to address issues of forms and roles of collective risk adaptation for strengthening group adaptive capacity to sustain development. Based on collective action theory and institutional analysis development framework, the model study of this study had been built to understand the collective adaptation, its forms, outcome, and factors related to both internal and external ones affecting this process. By adapting the social-ecological approach, this research was conducted in Tra Vinh and Kien Giang provinces, the two main coastal areas adversely affected by the saline intrusion in recent years. Stratified sampling and mixed methods using in-depth interviews, focus group discussions, case study and household surveys were used. The results suggested persistent exposure to saline intrusion in the two coastal zones. Farmers’ perceptions are different in the two areas, due to different scales of impacts, occurring more in the West than the East. The trend is also estimated to continue its growth in future time. In addition, increased impacts of salinity and high demands of shrimp in the market enabled farmers to shift from rice cultivation to shrimp cultivation in both sides of the Delta, extensive system in the West and intensive system in the East. This adaptation brought better income for some but created social impacts on those having less adaptive capacity to meet this challenge. Regarding social impacts, social change happens more in the West to solve difficulties of shifting process. In terms of community adaptive capacities had been found to be different between the West and the East that structure various forms of collective adaptation named social groups and formal organizations. It acts in different roles in the West and the East to reduce social impacts. Both social and ecological factors contribute to form and maintain collective adaptation. Physical conditions (water scarcity, the status of irrigation system), social and economic factors (economic status, group size, market demand) and institutional system (rules in use, head of the group) are those factors shaping collective adaptation in facing saline intrusion. For the future, in view of rising sea levels brought about by global warming, dealing with the reality of saline intrusion will become more serious; collective adaptation should be kept and developed as so to enhance community adaptive capacities, and social entrepreneurship and partnership should be adopted into agricultural fields for coastal farmers to organize and optimize resources to create better living conditions. The results of this research also contribute empirical knowledge of how the enhancement of farmers’ awareness of the effects of the impacts saline intrusion can contribute to collective risk adaptation

Buckling and postbuckling of axially-loaded CNT-reinforced composite cylindrical shell surrounded by an elastic medium in thermal environment

Buckling and postbuckling behaviors of nanocomposite cylindrical shells reinforced by single walled carbon nanotubes (SWCNTs), surrounded by an elastic medium, exposed to a thermal environment and subjected to uniform axial compression are investigated in this paper. Material properties of carbon nanotubes (CNTs) and isotropic matrix are assumed to be temperature dependent, and effective properties of nanocomposite are estimated by extended rule of mixture. The CNTs are embedded into matrix via uniform distribution (UD) or functionally graded (FG) distribution along the thickness direction. Governing equations are based on Donnell’s classical shell theory taking into account von Karman-Donnell nonlinear terms and interaction between the shell and surrounding elastic medium. Three-term form of deflection and stress function are assumed to satisfy simply supported boundary conditions and Galerkin method is applied to obtain load-deflection relation from which buckling and postbuckling behaviors are analyzed. Numerical examples are carried out to analyze the effects of CNT volume fraction and distribution types, geometrical ratios, environment temperature and surrounding elastic foundation on the buckling loads and postbuckling strength of CNTRC cylindrical shells

Some Solutions for Online Teaching of Literature at the Center of Vocational Education-Continuous Education

Pengajaran daring merupakan konten sentral dalam Arahan 800/CT-BGD?T tanggal 24 Agustus 2021 Kementerian Pendidikan dan Pelatihan tentang Pelaksanaan Tugas Tahun Pelajaran 2021-2022 dalam Penanganan Wabah Covid-19. terus menerapkan inovasi, bertahan dalam tujuan pendidikan dan pelatihan yang berkualitas. Pembelajaran Sastra online selama siswa tidak hadir di Sekolah Vokasi dan Pendidikan Berkelanjutan karena wabah Covid-19 bertujuan untuk menggantikan pengajaran tatap muka dan membantu Balai meningkatkan kualitas pengajaran. mempelajari dan menyelesaikan program pendidikan. Artikel ini menyebutkan beberapa kelebihan dan kekurangan belajar-mengajar Sastra online di SMK- melanjutkan pendidikan selama siswa absen dari pusat karena pandemi Covid-19. Dari situ, diusulkan beberapa solusi pembelajaran Sastra online selama siswa bolos sekolah di pusat karena wabah Covid-19 di Pusat Pendidikan Vokasi dan Pendidikan Berkelanjutan

Influence of temperature on mechanical characteristics of 1018 low carbon steel estimated by ultrasonic non-destructive testing method

The temperature dependence of ultrasonic velocities propagated in low carbon steel 1018 has been investigated by the A-scan mode of the ultrasonic non-destructive testing method. Experimental results show that these velocities are linearly dependent on temperature of the carbon steel sample in the range of 0 to 50 °C. Based on the experimental velocities of the longitudinal wave and the shear one, mechanical characteristics of this carbon steel including Poisson's ratio (υ), Young’s modulus (E), shear modulus (G), and bulk modulus (K) have been calculated. These mechanical characteristics have also been linear response with respect to the increase of sample’s temperature. By using linear fitting approach, the temperature dependence coefficients of these mechanical characteristics have been analyzed and estimated to be 9.76×10-6/°C, −0.057 GPa/°C, −0.023 GPa/°C, and −0.038 GPa/°C for v, E, G, and K, respectively. It is concluded that the influence of the temperature on the mechanical properties of the carbon steels is necessary determined due to the improved accuracy of the ultrasonic testing method

Nonparametric estimation of the fragmentation kernel based on a PDE stationary distribution approximation

We consider a stochastic individual-based model in continuous time to describe a size-structured population for cell divisions. This model is motivated by the detection of cellular aging in biology. We address here the problem of nonparametric estimation of the kernel ruling the divisions based on the eigenvalue problem related to the asymptotic behavior in large population. This inverse problem involves a multiplicative deconvolution operator. Using Fourier technics we derive a nonparametric estimator whose consistency is studied. The main difficulty comes from the non-standard equations connecting the Fourier transforms of the kernel and the parameters of the model. A numerical study is carried out and we pay special attention to the derivation of bandwidths by using resampling

Architecture Parallel for the Renewable Energy System

This chapter present one possible evolution is the parallel topology on the high-voltage bus for the renewable energy system. The system is not connected to a chain of photovoltaic (PV) modules and the different sources renewable. This evolution retains all the advantages of this system, while increasing the level of discretization of the Maximum Power Point Tracker (MPPT). So it is no longer a chain of PV modules that works at its MPPT but each PV module. In addition, this greater discretization allows a finer control and monitoring of operation and a faster detection of defects. The main interest of parallel step-up voltage systems, in this case, lies in the fact that the use of relatively high DC voltages is possible in these architectures distributed