1,197 research outputs found
The use of exopolysaccharide - producing cyanobacteria as biosorbents to remove copper from industrial waste - waters
No full textThe accumulation of heavy metals in water bodies represent a widespread cause of pollution, and poses the need to develop novel technologies to remove metals at the source, abating the costs of the commonly used chemical and physio-chemical methods. The use of cyanobacteria as biosorbents has been acknowledged as a promising alternative, due to their charged polysaccharidic envelopes which have affinity for metal ions. Nonetheless, the reseach must move towards: i) assessing the effectiveness of the process towards complex wastewater solutions which contain chemical species that can interfere with the sorption process, also considering the characteristics of the used strains, and ii) developing novel devices that support biomass growth and use, in order to achieve a scaling up of the process. We compared the specific removal of three cyanobacteria, Cyanothece 16 Som 2, Cyanothece ET5 and Cyanospira capsulata, towards Cu2+ contained, with various other metals, in two industrial effluents (one at pH 1.26 and one at pH 10.26). The strains were selected due to their previously assayed affinity toward Cu2+ in pure solutions (De Philippis et al. 2011). Acid or basic pretreatments (respectively for the acid and the basic effluent) were performed in the tentative to increase the specific removal. Metal concentration in solution, before and after the contact with the biomasses, was determined by atomic absorption spectrometry. Specific removals resulted different to those obtained towards pure metal solutions, likely due to the presence of other competing ions. Cyanothece 16 Som 2 showed the highest Cu2+ specific removal towards both the effluents. The pretreatment was effective only in the case of the basic effluent. Results proved the capacity of Cyanothece 16 Som 2 to act as a selective Cu2+ sorbent even in the presence of complex solutions. A novel prototype device is being projected in order to support the growth and the immobilization of the cyanobacterial biomass for its use in industrial fiel
Evolutionary Dynamics of Cooperative Sensing in Cognitive Radios Under Partial System State Information
No full textCooperative sensing enables secondary users to combine individual sensing results in order to attain sensing accuracies beyond those achieved by consumer RF devices. However, due to sensing costs, secondary users may prefer not to cooperate to the sensing task, leading to higher false alarm probability. In this paper, we study how information about the presence of cooperators affects the dynamics of cooperative sensing schemes. We consider two scenarios, namely the case when SUs cannot detect the presence of other potential cooperators, and the case when SUs have prior information on the presence of other SUs in radio range. Using an evolutionary game framework, we demonstrate that protocols delivering such type of information to SUs reduce cooperation and ultimately lead to degraded network performance. Finally, a learning process based on the replicator dynamics is proposed which is capable to drive the system to the evolutionary stable solution. The results of the paper are illustrated through numerical simulation
Arte Rupestre nelle Montagne dell’Al-Hajar | Rock Art in the Al-Hajar Mountains
No full textThe paper in this volume summarizes the researches of the author in Oman, with particular reference with the rock art in Northern Oman into the wadis of the Al-Hajar mountain
IJTIHAD IBNU HAJAR AL-ASQALANI DALAM MENGKONSTRUKSI ILMU HADIS
No full textIbnu Hajar al-Asqalani merupakan ulama hadis populer yang hidup pada abad ke 8 H. kepopulerannya itu kaya akan karya kitab-kitabnya, sehingga dengan karyanya itu Ibnu Hajar mendapatkan gelar Amirul Mu’minin fil hadis. Lantas dengan karya yang banyak itu, adakah pemikiran baru dan ijtihadnya yang sebelemunya tidak ada. Para ulama setelahnya banyak yang mengutip pada kajian hadis serta mengkodipikasikan dalam kitabnya, seperti al-Sakhawi, al-Suyuthi, al-Biqha’I, Zakaria al-Anshari dan lain-laoin. Pada peniltian ini diawali dengan historiografi, karya-karyanya, dan pemikirannya yang tertuang dalam kitabnya. Melalui penelitian bidang library research yang mengandalkan bahan penelitian dari perpustakaan, seperti buku, kitab, jurnal, ensiklopedia atau majalah sebagai sumber data untuk mencari dan melacak permasalahan tersebut. Adapun Hasil dan temuan penelitian ini, ijtihad Ibn Hajar al-‘Asqalani dalam bidang Ilmu hadis bahwa beliau layak disebut seorang mujtahid dalam bidang hadis atas dasar pemikirannya yang tertuang dalam karyanya yang mencapai 177 karya Ibnu Hajar dalam bidang hadis, serta dalam kitabnya banyak pemikiran baru yang ulama sebelumnya tidak ada.Â
Pendidikan Anak Dalam Perspektif Siti Hajar
No full textPenelitian ini dilatar belakangi karena keprihatinan penulis tentang pendidikan anak yang ada, dimana orangtua terutama ibu kebingungan dan sulit untuk mencari figur dalam mendidik anak-anak mereka. Semua orangtua terutama ibu muslimah mengharapkan anaknya shaleh, taat beribadah kepada Allah SWT. Berbakti kepada kedua orangtuanya. Berbagai macam cara sudah dilaksanakan orangtua di rumah, guru di sekolah, dan masyarakat pada umumnya demi tercapainya tujuan pendidikan anak, namun hasilnya tidak sesuai dengan yang diharapkan malah tenggelam dalam kemaksiyatan dan kejahatan. Disinilah dibutuhkan model yang dapat dijadikan panutan untuk mendidik anak yaitu dari istri Nabi Ibrahim Ailihissalam adalah Siti Hajar yang telah sukses mendidik putranya Isma’il sehingga menjadi anak yang shaleh, taat beribadah kepada Allah SWT serta berbakti kepada kedua orangtuanya. Penelitian ini menggunakan pendekatan historis analisis, dengan mempelajari dan menggali fakta-fakta sejarah tentang Siti Hajar dalam mendidik putranya Isma’il juga kondisi sekarang. Untuk kemudian dianalisa yang akan melahirkan pemahaman yang utuh terhadap tahapan-tahapan yang dilakukan Siti Hajar dalam mendidik anak sehingga anaknya menjadi anak yang shaleh, taat kepada Allah SWT serta kepada kedua orangtuanya
Pemikiran Ibnu Hajar Al-Asqalani dalam Ilmu Administrasi Negara
No full textIbn Hajar Al-Asqalani (773-852 H) was a classical Islamic scholar and an author of the Fathul Baari book which explains the Sahih Bukhari book. His book contains themes that discuss among others law in the maintenance of power and government in the State which is thought to have a connection with public administration sciences. Therefore, research about Ibn Hajar Al-Asqalani\u27s thoughts in the public administration sciences was conducted, with a problem formulation, how the concept of Ibn Hajar al-Asqalani\u27s thoughts in public administration sciences? The purpose of this study is to analyze Ibn Hajar Al-Asqalani\u27s thoughts in public administration sciences from Fathul Baari\u27s books. Library research methods are used to study the Fathul Baari books as a source of data/subject of research; then as the focus/object of research is public administration sciences. The data collected were processed and analyzed using induction and deduction techniques. The research was conducted in the first semester of 2020. The results of the study found a concept from Ibn Hajar Al-Asqalani’s thoughts in public administration sciences, which includes categories: leadership; government officials; personnel in the organization; governance; administrative principles; salary, and reward & punishment which is relevant to public administration sciences which are sourced from the Qur’an, hadith, and Islamic legacy. Next, stakeholders and related academics need to use these findings for educational, research, and development purposes public administration sciences using non-Western perspectives
Memanusiakan Manusia Melalui Pendidikan di Dalam Keluarga Menurut Pemikiran Driyarkara dan Ki Hajar Dewantara
No full textArticle written by the author focuses on explaining about Driyarka and Ki Hajar Dewantara’s ideas and taught about education in the family. Ki Hajar Dewantara, put forward the concept of the Three Centers of Education, which states that education occurs in the family, school and social community, with the family as the first and main educational environment. His famous principle, "Ing Ngarso Sung Tulodo, Ing Madyo Mangun Karso, Tut Wuri Handayani," describes the role of parents in various positions to educate children: providing example, and encouragement. According to Ki Hajar Dewantara, education in the family must also foster children's independence and responsibility, as well as giving them the freedom to explore their interests and talents. Meanwhile, Driyarkara emphasized that the family is the first place of a persons's presence as a human being, and the family is the first step in the process of his journey towards becoming a full human being. Overall, Driyarkara and Ki Hajar Dewantara's ideas about education in the family are related each other. Both agree that effective education starts from the family with an active and loving role of parents. While Driyarkara places more emphasis on holistic education and love, Ki Hajar Dewantara focuses on independence, freedom and the role of parents in supporting children from various educational positions. This writing uses a library research method sourced from both books and journals regarding the concept of family education according to Driyarkara and Ki Hadjar Dewantara. Through library sources, the author reads, adapts, summarizes and reports back ideas related to this article. Library study is also called text study. Using this method is very important because it is able to understand deeply and comprehensively the concept of family education according to Driyarkara and Ki Hajar Dewantara.AbstrakArtikel ini menampilkan pemikiran serta gagasan Driyarkara dan Ki Hajar Dewantara tentang pendidikan di dalam keluarga. Ki Hajar Dewantara, mengemukakan konsep Tri Pusat Pendidikan, yang menyatakan bahwa pendidikan terjadi di keluarga, sekolah, dan masyarakat, dengan keluarga sebagai lingkungan pendidikan pertama dan utama. Prinsipnya yang terkenal, "Ing Ngarso Sung Tulodo, Ing Madyo Mangun Karso, Tut Wuri Handayani," menggambarkan peran orang tua dalam berbagai posisi untuk mendidik anak: memberi teladan, semangat, dan dorongan. Pendidikan dalam keluarga menurut Ki Hajar Dewantara juga harus menumbuhkan kemandirian dan tanggung jawab anak, serta memberikan kebebasan untuk mengeksplorasi minat dan bakat mereka. Secara keseluruhan, pandangan Driyarkara dan Ki Hajar Dewantara mengenai pendidikan dalam keluarga saling melengkapi. Keduanya sepakat bahwa pendidikan yang efektif dimulai dari keluarga dengan peran orang tua yang aktif dan penuh kasih sayang. Sementara Driyarkara lebih menekankan pada pendidikan holistik dan cinta kasih, Ki Hajar Dewantara fokus pada kemandirian, kebebasan, dan peran orang tua dalam mendukung anak dari berbagai posisi pendidikan
Sufisme Ki Hajar Dewantara
No full textThis article explores how Ki Hajar Dewantara has built his world of reality formulation. He has a sufism epistemology in establishing of his thinking. His sufism epistemology built evidently buried by well-established theories stating that Islam in Indonesia is a syncretic Islam, then labeled as religion Kejawen initiated as a religion abangan. But others say that the history of Islam in Java is not Islam Kejawen. On the contrary, it is Islam that affiliated with Sufism. This fact becomes important when the author had to review epistemology of Ki Hajar Dewantara. Because the reality is open to the fact that his epistemology is Sufism epistemology that puts knowledge about the duality of unity. Based on the epistemology, he give a clear interpretation of the relationship between man and nature that leads to the divine reality. Theoretically God created the universe as evidence or sign of existence and people should know about it. Armed with the epistemology, Manunggaling Kawula Gusti term can be interpreted in two ways, first it means that humans have the values of divinity, second, it means united with nature
Sa El Hajar – Gharbia. Egyptian Topography
No full textThe design experimentation is based on the relation between the evolution of the settlement and the specific geographical condition of the site, with the aim of enhancing its peculiarities and tracing the identity of the place. Defining the transition between city and countryside, the intervention translates into the design of two parks. The Green Belt unfolds along the perimeter of Sa el Hajar and is conceived as a filter space, a limit for future expansions of the built environment, by generating a vibrant open spaces interconnecting with the pattern of a dense fabric. The Green Spindle contributes to reinforcing the figure and establishes itself as a new space for agricultural and energy production. The design of the agricultural land is defined by parallel bands that undergo a progressive reduction in width, recalling a geometric scheme developed by Paul Klee in Monument an der Grenze des Fruchtlandes, in 1929 (meisterdrucke.uk, 2023)
L’arte rupestre nelle montagne dell’al-Hajar, penisola arabica. Temi, cronologia, interpretazione
No full textThousands of engraved and painted figures have afways intrigued visitors to the wadis of Af-Hajar Mountains in the Peninsula of Oman. Who created these enigmatic figures and when were they made? What are their hidden meanings? In the last decade the rock art of AI-Hajar Mountains has benefited from extensive research over a number of projects with a primary focus on engraved and painted efements. The Ministry of Heritage and Tourism of the Sultanate of Oman and the Sharjah Archaeology Authority initiated a series of surveys, some carried out by the present author, that have resulted in focating several important sites covering an extensive period of aver 7000 years and in offering a first chronological proposaf ofthe rock art. The themes in AI-Hajar Mountains rock art can be separated into five distinct categories: animafs, humans, abstract figures, objects, and inscriptions. These can be divided into six chronologicaf phases based on styfe, superimpositions between figures, comparison of different levels of re-varnishing, and the presence of certain animals
and weaponry
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