Green synthesis of zinc nanoparticles using Ipomoea asarifolia leaves extract and its adsorption properties for the removal of dyes

In this paper, a green method is reported for the synthesis and characterization of zinc nanoparticles using Ipomoea asarifolia leaf extract as reducing and capping agent together with polyethylene glycol (PEG-10000) as stabilizing agent. The biosynthesized zinc nanoparticles were characterized by UV-Vis absorption spectroscopy, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM); and were used as adsorbent for the removal of Bromophenol blue (BPB), and Eriochrome black T (EBT) dyes. Isotherms, kinetics and thermodynamics of the adsorption process were studied with the view to understand the adsorption mechanism. The adsorption isotherms were closely described by Freundlich isotherm model with correlation coefficient (R2) of 0.99. The adsorption kinetics data were well fitted by the pseudo-second-order rate model with high regression coefficient (0.998). The intra particle diffusion of BPB anId EBT on ZnNPs represents the rate-limiting step. The adsorption capacity increases with the increase in temperature (from 298 to 318K) and thermodynamic calculations suggested that the adsorption of the dyes onto ZnNPs is an endothermic process with ΔH values of 10.78kJ/mol for BPB and 14.14 kJ/mol for EBT respectively.Keywords: Adsorption, Bromophenol blue, Eriochrome black T, Ipomoea asarifolia, Zinc nanoparticle

Optimization of gas turbines for sustainable turbojet propulsion

AbstractGas-turbines are widely used to power aero planes because they are light, compact with a high power-to-weight ratio. In the turbo jet engine, the main operating variables are: compressor pressure ratio rp and turbine inlet temperature (TIT). These variables affect the specific thrust and specific fuel consumption (SFC), which represent the main performance parameters. In addition to the analytical work, a computer program of the General Algebraic Modeling System (GAMS) was used for analysis and optimization. The analysis shows that the specific thrust strongly depends on turbine inlet temperature (TIT), where a 10% decrease in TIT results in 6.7% decrease in specific thrust and 6.8% decrease in SFC. Furthermore, the value of optimum pressure ratio rf for maximum specific thrust increases with TIT. A 10% decrease from design TIT results in 11.43% decrease in rf. The value of optimum pressure ratio for the turbojet engine operating at Ma=0.8 and altitude Alt=13000m, and TIT=1700K was found to be 14

Effect of annealing temperature on the structural and optical properties of nanocrystalline ZnO thin films prepared by sol-gel method

Undoped zinc oxide (ZnO) thin films were prepared by a sol-gel method. The effect of annealing temperature from 500 to 700°C on the structural and optical properties of the films was studied. The films nanostructure characterized by the X-ray diffraction method showed that the films were single phase ZnO with wurtzite structure. The surface morphology studied using the field emission scanning electron microscope showed that the thickness of the films increased with the increment of annealing temperature. The grain size of the films increased with the increment of the annealing temperature. The film surface roughness measured using the atomic force microscope showed that the surface roughness of the film decreased (from 2.3 to 1.02 nm ), when the annealing temperature increased from 500 to 600°C then it increased to 3.06 nm at 700°C. The optical properties were studied by the UV-Vis spectrophotometer. The results showed that the films had high transmittance (above 80%) in the visible range and the exciton absorption occurred at a wavelength of 379 nm. The energy gap decreased with the increment of annealing temperature

HUBUNGAN ANTARA KONDISI FISIK RUMAH DAN KEPADATAN HUNIAN DENGAN KEJADIAN ISPA PADA ANAK BALITA DI KELURAHAN SINDULANG 1 KECAMATAN TUMINTING KOTA MANADO

Pendahuluan : Infeksi Saluran Pernapasan Akut (ISPA) adalah penyakit saluran pernapasan atas atau bawah biasanya menular dan sering terjadi pada anak. Tingkat mortalitas ISPA sangat tinggi pada bayi dan anak-anak. Kejadian ISPA pada balita di Puskesmas Tuminting perkiraan penumonia 22 balita dan kesukaran bernafas 10 balita. Tujuan : Penelitian ini bertujuan untuk mengetahui hubungan antara kondisi fisik rumah dan kepadatan hunian dengan kejadian ISPA pada anak balita di kelurahan Sindulang 1 Kecamatan Tuminting Kota Manado pada tahun 2018. Metode Penelitian : Jenis penelitian ini adalah survei analitik dengan rancangan cross sectional. Jumlah sampel yang diambil 100 responden dari 345 populasi. Variabel yang diteliti yaitu luas ventilasi, jenis lantai, kepadatan hunian dan kejadian ISPA. Analisis data menggunakan uji chi square dan fisher exact test. Nilai koefisien dalam penelitian ini yaitu (α) 0,05, Sehingga jika nilai (p value) dari hasil uji statistik lebih dari nilai α maka variabel tersebut tidak berhubungan sebaliknya jika nilai (p value) kurang dari nilai α maka variabel tersebut berhubungan. Hasil : Hasil penelitian menunjukkan bahwa terdapat hubungan antara luas ventilasi dengan kejadian ISPA p= 0,000, tidak terdapat hubungan antara jenis lantai dengan kejadian ISPA p=0,801, dan tidak terdapat hubungan antara kepadatan hunian dengan kejadian ISPA p=0,531. Kesimpulan : Kesimpulan dari penelitian ini yaitu terdapat hubungan antara luas ventilasi dengan kejadian ISPA pada anak balita, tidak terdapat hubungan antara jenis lantai dengan kejadian ISPA pada anak balita dan tidak terdapat hubungan antara kepadatan hunian dengan kejadian ISPA pada anak balita. Saran : Disarankan Puskesmas Tuminting memberikan penyuluhan tentang penyakit ISPA.Kata Kunci : Ventilasi, Lantai, Kepadatan Hunian, ISPAABSTRACTBackground : Acute Respiratory Infections (ARI) is upper or lower respiratory tract diseases is usually contagious and common in children. The mortality rate of ARI is very high in infants and children. The incidence of ARI in infants at Puskesmas Tuminting estimated 22 toddlers penumonia and difficulty breathing 10 toddlers. Purposes : The study aimed to determine the relationship among the physical condition of house and the density of occupancy with the incidence of ARI in children under five in Kelurahan Sindulang 1 Kecamatan Tuminting Kota Manado on 2018. Method : The type of this study was survey analytical by cross sectional design. The number of samples taken 100 respondents from 345 population. The variables studied were ventilation area, floor type, occupancy density and ARI occurrence. The data analysis was done using chi square and fisher exact test. Coefficient value in this research that is (α) 0,05, So if the value (p value) of the statistical test results more than the value of α then the variable is not related otherwise if the value (p value) is less than the value of α then the variable is related. Result : The results showed that there was a relationship between ventilation area with ARI occurrence p = 0,000, there was no correlation between floor type and incidence of ARI p = 0,801, and there is no relationship between the density of occupancy with the incidence of ARI p = 0,531. Coclusion : From this results of research can be concluded that there is a relationship between ventilation area with the incidence of ARI in children under five, there is no relationship between the type of floor with the incidence of ARI in children under five and there is no relationship between the density of occupancy with the incidence of ARI in children under five. Suggestion : To proposed the Puskesmas Tuminting could be given provide counseling about ARI dieases.Keywords : Ventilation, Floor, Occupancy Density, AR

Susceptibility of Japanese quails (Cortunix cortunix japonica) to experimental infection with Newcastle disease virus, Kudu 113 strain

This study was carried out to determine the response of Japanese quails experimentally infected with Newcastle disease virus (NDV) kudu 113 strain using a haemagglutination inhibition test and the ability of the species to transmit the infection to chickens. The administration of kudu 113 strain of Newcastle disease virus (108.5 /ml) orally at 0.1ml/quail in the infected group (group B) resulted in an antibody response with a geometric mean titre of 23.79 on day 32 when compared to non-infected quails (group A) which did not show (p>0.05) evidence of Newcastle disease antibodies throughout the experiment and also differed significantly (p<0.05) from group B, indicating that oral inoculation of the virus was successful and the birds were infected. Clinical signs of ND were first observed in the quails 7 days post-infection (pi) with effects on egg production and egg quality. The transmission of the velogenic NDV from the quails (group B) to the sentinel chickens was clinically evident 4 days after they were placed in close contact with the infected quails. There was 100% mortality in the sentinel chickens between 4 to 7 days post contact. Thus, quails could serve as a potential source of ND for chickens

Local Stakeholders’ Perception toward Tin Mining Issues in Bangka Belitung

Since tin mining that has been long and massively lasted in Bangka Belitung Island province has created lots of positive impacts for economical growth; however, its negative impact has been also not least. In the middle of status quo, stakeholders as the part of decision makers didn’t firmly take the stance. Nevertheless, this study proved that the related stakeholders were aware of the negative context occurred and had positive perception on more firmly tin mining regulation policy. There was the awareness that tin mining had destroyed environment. The awareness of stakeholders’ didn’t eventually get along with the current policy. There is occurred status quo, though stakeholders’ perception itself has wished a firm policy, an interesting condition to describe the tin mining policy complexity in this regio

Teneur du muscle en glycogène et identification des viandes falsifiées

Une épreuve chimique permettant de déterminer la teneur totale en glycogène des muscles de différents animaux domestiques est décrite. La différenciation dépend de la variation de l'intensité de la couleur mesurée au colorimètre. L'épreuve peut être utilisée pour la diagnose de la viande foetale (non comestible) et de toutes les autres variétés de viande. Elle peut également permettre de différencier très bien la viande de buffle de celle du boeuf, et cette dernière de celle du chameau. La différenciation entre la viande de chameau et de buffle devra être confirmée par d'autres méthodes. Les résultats obtenus avec la viande de mouton et celle de chèvre sont presque semblables et se superposent à ceux obtenus avec la viande de veau. L'analyse statistique des valeurs obtenues à la suite des mesures effectuées sur différentes régions du corps et chez différents animaux est enregistré

Politics of environmental law in relation to mining in Bangka Belitung: A mapping

Legal policy is an official policy that is enforced by either adding new laws or by replacing old laws with new ones in order for a country to accomplish its goals. In environmental context, attention to legal policy becomes crucial, especially when associated with massive mining that takes place in some areas. In other words, mining activity in all its forms and operational methods is bound to be influenced by government's environmental policies, including those in the form of laws and regulations. Since environment and mining affect each other, they are inseparable. The substances of environmental policies affect policies in the mining sector. Hence this normative study aims to do a mapping of environmental policies in regards to tin mining in Bangka Belitung. The data collection technique employed in this qualitative study was literature review, with laws and regulations as its primary data. This study used two approaches, namely statute approach and conceptual approach

Strategic ecological issues: environmental problems in a perspective of regional development in Bangka Belitung

A region’s development planning should be carried out by referring to the strategic issues faced by the region. Thus, strategic issues become the basis upon which regional governments formulate their policies and work programs. This study examined how each region in Bangka Belitung Islands Province positioned strategic issues of ecology in its regional development planning. The current writers examined eight regional governments’ Regional Medium-Term Development Plan (RMTDP) documents; one of which belongs to the provincial government, while the rest belongs to the regency/city governments. This study found that ecological issues comprised an average 17.6% of the strategic issues in all of the planning documents, the highest of which was found in Belitung Regency’s planning document. In addition, the analysis revealed that the general focus of the strategic ecological issues was environmental damage, which was reported by three of the regions as a result of mining activities. This study provides an illustration of how each regional government is committed to take ecological issues seriously and include them in the strategic issues at the regional level

Environmental regulations (its identification and downstream implementation in Bangka Belitung)

Article 28H and section (4) of Article 33 in the Indonesian Constitution guarantee every citizen the right to a good and healthy environment with green economy. In order to implement it, the government issued Law No. 32 of 2009 on Environmental Protection and Management. The environmental regulations that became the umbrella act are facing challenges both in substance and implementation. Substantially, questions remain whether the green constitution has been incarnated in this regulation, and how it positions itself as the umbrella act for a number of regulations. In implementation, the challenges include the availability of legislations, from government regulations to technical policy, and its implementation in regional level, both at the provincial and regency levels in Bangka Belitung Islands. In each regime, the environmental issues have always been a part of strategic issues. This research focused on identifying environmental regulations from upstream to downstream, and how they are implemented in the context of environmental issues due to tin mining in Bangka Belitung. Data were obtained through literature review using statute and conceptual approaches