The increase of solid waste production is a general problem in municipality, particularly of plastic waste. The durability, light-weight, anticorrosiveness, and inexpensiveness properties of plastic make it favorable to be used in daily life, including in Salatiga. However, plastic is one of some non-biodegradable materials that could lead to soil and water pollution as it contains toxic compounds such as aromatic hydrocarbons, phthalates, and organochlorine. Various studies in municipal solid waste management have been conducted. While those studies often applied various approaches separately, researches in regard to the role of stakeholders in municipal solid waste management are very limited. This study aims to explain the plastic waste management in Salatiga based on the role of the corresponding stakeholders. This qualitative study shows that there are four stakeholders who were involved in municipal plastic waste management in Salatiga. They were the households who generate wastes, the scavengers who sorts the wastes, Bank Sampah and collectors who have the same role in order to collect the wastes and treat the plastic wastes through reusing or recycling processes, and the government. Currently, efforts in waste treatment in Salatiga are focused on the system of collecting-tranferring-disposal mode, waste treatment by reuse and recycle processing, and landfilling. Reducing plastic consumption must take into account the sociocultural aspect and environmental awareness, as the people still interested to use plastic instead of using other materials in substitution. Finally, the role of government is central to educate the community in term of sorting activities and reducing waste production, build the capacity of Bank Sampah, and manage the role of scavengers and collectors. Other alternatives include creating synergy between the collectors and Bank Sampah, as well as ensuring final treatment of the unprocessed wastes disposed by collectors and Bank Sampah.

Indonesia has a potency in the coffee sector. Many robusta coffee farmers really depending on the coffee sector. For the example, 75% of coffee farmers in Temanggung Regency work in the robusta coffee sector. Fluctuations and declining coffee production can be a burden for coffee potency optimization and decreasing the income of the coffee farmers. This study aims to determine the factors that can affect the declining of Robusta coffee production in Temanggung Regency. The analytical methods used in this study are Value Chain Analysis, Forward Linkage and Backward Linkage, and Fishbone Analysis. The author is using secondary and primary data. Secondary data was obtained from Statistics Indonesia and Directorate General of Plantations at the Ministry of Agriculture.Primary data was obtained from interviews with 3 key informans Robusta coffee farmers in Gesing Village who eligible. The result showed that age of plants and distance of each plants, lack of coffee picking services, weather and lack of cooperation and other sectors, such as the trade sector and the industrial sector can lead into a decreasing of coffee production.

Peningkatan jumlah penduduk berdampak pada alih fungsi lahan yang bermuara pada mencuatnya berbagai isu lingkungan, termasuk isu ketersediaan air bersih untuk memenuhi kebutuhan air bersih masyarakat. Penyediaan Air Minum dan Sanitasi Berbasis Masyarakat (PAMSIMAS) merupakan salah satu program pemerintah yang diupayakan untuk memenuhi kebutuhan air bersih dan sanitasi masyarakat. Meskipun masih ada kendala dalam pelaksanaannya, program ini telah menunjukkan manfaat dan dampak positif di berbagai daerah. Penelitian ini dilakukan untuk menjelaskan capaian program PAMSIMAS yang ada di Kabupaten Temanggung sebagai upaya pemerintah untuk meningkatkan kesejahteraan masyarakat Kabupaten Temanggung. Studi ini merupakan studi kuantitatif menggunakan data sekunder lalu dianalisis secara deskriptif. Hasil studi menunjukkan bahwa realisasi PAMSIMAS di Kabupaten Temanggung untuk air minum dinilai baik, yang terendah sekitar 75%, bahkan ada capaian yang melebihi target 100%. Realisasi PAMSIMAS masih fluktuatif, tiga kecamatan yang realisasi sanitasinya rendah yaitu Kecamatan Bansari (27,13%), Kecamatan Wonoboyo (8,00%) dan Kecamatan Tretep (6,00%). Faktor yang dapat mempengaruhi tingkat sanitasi tersebut adalah rendahnya tingkat ekonomi masyarakat, norma sosial yang lemah, dan modal sosial yang lemah. Studi lebih lanjut diperlukan untuk mengidentifikasi faktor penyebab rendahnya realisasi sanitasi di kecamatan tersebut sehingga dapat ditemukan solusinya

Geometry is one of the particular problems for students. Therefore, several methods have been developed to attract students to learn geometry. For undergraduate students, learning geometry through surface visualization is introduced. One topic is studying parametric curves called the hypocycloid curve. This paper presents the generalization of the hypocycloid curve. The curve is known in calculus and usually is not studied further. Therefore, the research's novelty is introducing the spherical coordinate to the equation to obtain new surfaces. Initially, two parameters are indicating the radius of 2 circles governing the curves in the hypocycloid equations. The generalization idea here means that the physical meaning of parameters is not considered allowing any real numbers, including negative values. Hence, many new curves are observed infinitely. After implementing the spherical coordinates to the equations and varying the parameters, various surfaces had been obtained. Additionally, the differential operator was also implemented to have several other new curves and surfaces. The obtained surfaces are useful for learning by creating ornaments. Some examples of ornaments are presented in this paper.

This article shows the result of entrepreneur mathematics by creating mathematical objects from silver. The objects discussed here are accessories to introduce undergraduate students to integrating several aspects of learning mathematics.  These are learning geometry modernly, mathematical art, popularizing mathematics for society, introducing entrepreneurial values using mathematics, teamwork for achieving targets, and considering local heritage in mathematics. These aspects are blended into activity by creating designs and producing products based on the obtained designs. The particular product for this activity is creating silver accessories. The used research method is initiated by creating designs with the help of software where the surface equations are known. After the designs are obtained, the designs are communicated to the silver craftsman to be a partner in design testing and manufacturing of accessories products using the given designs. The size and the similarity of perceptions to the appearance of the design are discussed because the actual design is a three-dimensional image but expressed in objects to be two- dimensional objects. After productions are obtained, the accessories are managed to be promoted to the marketplace and social media as a form of entrepreneurial activity with materials starting from mathematics.