bluuebunny/crossref_metadata_2025_split huggingface dataset:
ALEV GİZLEYEN TASARIMI VE 3D YAZICI İLE PROTOTİP İMALATI
Authors: ÖZASLAN Halil , BOZDEMİR Mustafa 
Published: April 2022

Ateşli silahların bir kullanıcı tarafından ateşlenmesiyle namlu ucunda yüksek görünümlü alevler oluşur. Ateşli silahların özellikle gece kullanımlarında yüksek alev görünümlerinin ciddi zararları vardır. Oluşan alevler, kullanıcın gözlerini kör edebilir ve düşman kuvvetler tarafından kullanıcının konumunun açık edilmesine neden olurlar. Başlıca bu ve diğer nedenlerden dolayı ateşli silahların namlu ucuna takılan cihazlar geliştirilmiştir. Namlu ucu cihazlarından en yaygın olarak kullanılanları ise namlu frenleri, susturucular ve alev gizleyenlerdir. Yapılan çalışma da özellikle gece kullanımlarında kullanıcının gece görüşünü artırıp, konumunu gizlemek için ve içerisinde özel fonksiyonlarda bulunan çok fonksiyonlu bir alev gizleyen tasarlanıp prototipi 3d yazıcıda imal edilmiştir.
Geleneksel tasarım yöntemi kullanılarak 7.62 mm kalibrelerde kullanılmak üzere özel yapı ve fonksiyonları bulunan Atabey Alev Gizleyen modeli SolidWorks ile tasarlanarak SolidFlow ile iç hava akış analizleri yapılmıştır. Tasarlanan Atabey Alev Gizleyen modelinin, üç boyutlu yazıcı Zortrax firmasının ürettiği M200 modeli ile prototipi imal edilmiştir. Atabey Çok Fonksiyonlu Alev Gizleyen ile namlu patlaması sonrasında oluşan alev görünümü minimize edilerek kullanıcının gece görüşü artırılır ve konumu gizlenir. Özel tasarımı ile telleri kesebilir, kesici ve delici yapısı ile düşman kuvvetlere karşı birebir müdafaa da kullanılabilir. Eklenen özel fonksiyonlar ile alanında eşsiz bir alev gizleyen olmuştur.
Serosurveillance among healthcare workers vaccinated with ChAdOx1 nCoV-19 Corona vaccine in a tertiary hospital of Kerala, India: prospective cohort studу
Authors: Njarekkattuvalappil S. K. , Bhaskaran R. , Sree Raj V. , Jose P. , Rafi Aboobacker M. , Thomas J. , Innah S. J. , Raphael L. , Unnikrishnan U. G. , Rajmohan P. , Valsan Ch. , Kuttichira P. 
Published: April 2022

Aim. To evaluate antibody responses following two doses of ChAdOx1 nCoV-19 Corona vaccination in a tertiary care setting and the association of host factors like age, body mass index and comorbidities in determining this antibody response.Materials and methods. This prospective serosurveillance study was done among healthcare workers of Jubilee Mission Medical College, vaccinated during January- April 2021. Blood samples were drawn from 170 participants after their first dose and from 156 participants after their second dose of CovishieldTM to measure the specific Ig G antibodies against the recombinant S1 subunit of the S protein of SARS-CoV-2.Results. The median level of anti-SARS-CoV-2 Ig G antibody 28–56 days after the first dose vaccination was 3.64 S/C (1.33, 7.24) and 11.6 S/C (8.61, 14.27) after 14 days of second dose vaccination. Protective levels of anti-SARS CoV-2 Ig G antibodies (≥ 9.5 S/C) was developed by 25 participants (14.7%, 95% confidence interval: 9.8% to 20.9%) after 28–56 days of first dose of vaccination and by 109 participants (69.9%, 95% confidence interval: 62% to 77%) after 14 days of second dose. Health care workers in the age group below 60 years (p = 0.027) and without comorbidities (p = 0.079) showed higher protective Ig G levels. But on multiple logistic regression only age under 60 years was found to be statistically significant.Conclusion. After the first dose of the ChAdOx1 nCoV-19 vaccine, the formation of Ig G antibodies was observed, the level of which increased after the second dose. Among the various associated factors studied only the age of the participants below 60 years was found to be statistically significant for protective antibody levels. Follow up studies involving larger and different ethnic population is key to decoding the antibody response especially in the elderly and high-risk groups.
Climate Change and the Church: An Eschatological Perspective
Authors: Izidor Samuel , Igwe Andrew A. 
Published: April 2022

Man has had various form of religious belief, worship and teaching on the origin of the earth and man. This background has accounted for the variant culture and response to nature, the environment and climate change and relationship with believed Creator. Judaic religion and its offshoot of Christian religion constitutes a body of believers and worshippers that have established a belief system and teaching on the origin of man and the earth to which they have ascribed to the creative power of a supreme being known among them as the Almighty God. Some other religions have worshipped the elements and forces of nature eg the sun, moon, stars, mountains, rivers, wind etc that themselves greatly influence the environment and climate. Climate change is the net effect of recorded weather conditions over a given period of time regarding atmospheric conditions, temperature variations, meteorological and earth structural changes etc measured in regularity and pattern. Eschatology is the Christian believe in the events that will culminate in the end of life forms on earth. Climate change and religion are as old as man and coexist. This study examines this relationship with reference to eschatology. Climate change is caused either by the activities of naturaly occurring events of the elements or the activities of man. The system approach and empirical exposition on the doctrine of eschatology as propagated by the Church vis-à-vis climate change effects was adopted. Study outcome have pointed to a clear relationship between climate change and church teaching on eschatology.
Unpacking the Image of the Female Character: The Joys of Motherhood in Perspective
Authors: Blay Richmond Amgbo , Annin Felicia 
Published: April 2022

This paper focuses on Buchi Emecheta’s depiction of the female character in her novel, The Joys of Motherhood. In particular, this paper examines how Emecheta directs attention at restoring the image of the “fallen” woman in the novel where the patriarchs dominate affairs. The novel achieves this aim through the narrative technique employed in the complex role of the woman figure who defiles all odds to achieve her heart desires at the end of the story. The findings reveal that Emecheta presents both positive and negative archetypal images of the African woman in the novel. It is however worthy of note that Emecheta’s negative depiction of the African woman far outweighs the positive ones. To an extent, Emecheta’s portrayal of the figure of a woman is an affront to the way a female writer ought to present the woman with exalting images rather than images of disgust.
Juridical Review of Citizen Lawsuit in its Application in Indonesia
Authors: Fitriana Ermania Chobelia , Quraisyta Nabilla Farah 
Published: April 2022

In Indonesia, there are people who feel that the fulfillment of public facilities provided by the government has not been fully fulfilled. This has an impact on the disappointment of the people who feel that their rights have only been violated or not fulfilled by the government. The community then files a lawsuit to the Court using the Citizen lawsuit method Lawsuits. Many of these lawsuits were rejected by the courts because they were deemed not to meet the elements of the Citizen Lawsuit . Citizen Lawsuit is a citizen's right to sue which is intended to protect citizens from various losses due to actions, policies or decisions made by the Government. Although b many lawsuits are filed using the Citizen Lawsuit method but there are no laws and regulations governing the lawsuit that . This study aims to describe and analyze questions about what elements must be met so that a lawsuit is categorized as a lawsuit Citizen Lawsuit and Position Citizen Lawsuit in civil procedural law in Indonesia . The research method used was collected using normative research techniques and then analyzed qualitatively , namely an analysis that describes the data obtained in the form of sentence descriptions. Then a conclusion is drawn which is the answer to the problem. It is hoped that in the future there will be a definite rule regarding the model of the Citizen Lawsuit lawsuit in Indonesia, as well as the rules regarding Class Action and Legal Standing
ENVER METE ASLAN’A AİT KÜRDÎLİHİCAZKÂR ZEYBEK’İN İSTANBUL LÂVTASI İLE KENDİ İCRASI ÜZERİNE TEKNİK BİR İNCELEME
Authors: ÇAYLAK Gökhan 
Published: April 2022

Lâvta çeşitli coğrafyalarda ve dönemlerde, farklı şekil ve icra özellikleriyle kendine yer bulmuş bir çalgıdır. Çalışmada ele alınan lâvta, İstanbul’a özgü ve çoğunlukla kahvehane, meyhane gibi eğlence kültürünün bir parçasıdır. Hem icra edildiği coğrafyanın açıklanması hem de diğer lâvtalar ile karıştırılmasının önlenmesi için çalışmada, çalgı İstanbul lâvtası olarak isimlendirilecektir. Kabasaz takımında yer aldığı bilinen ve daha çok eğlence müziğine yönelik bir çalgı olan İstanbul lâvtasının icra üslup özellikleri arasında mızrap vuruş yönleri, melodiye eşlik eden bam ses kullanımı ve ritmik yapı gibi önemli hususlar bulunmaktadır. Kendine has icra özellikleriyle en çok XIV. yüzyılda icra edilmiş ve çoğunlukla Rum müzisyenlerce kullanılmıştır. XX. yüzyılın başlarında çeşitli kültürel ve müzikal sebepler nedeniyle çalgının gözden düştüğü ve kullanım alanının neredeyse kalmadığı bilinmektedir. Çalgı ile ilgili takip edilebilir ve ulaşılabilir yazılı kaynakların sayıca azlığının yanında günümüze ulaşılabilen sesli ilk kayıt Tanburî Cemil Bey’in yapmış olduğu taksimlerdir. İstanbul lâvtası Cemil Bey’den günümüze çeşitli müzisyen ve araştırmacıların özel ilgileri sayesinde ulaşabilmiştir.
Bu çalışmada Enver Mete Aslan’a ait Kürdîlihicazkâr Zeybek’in kendisi tarafından İstanbul lâvtası ile icrası esnasında ses ve görüntü kaydı alınmış, yapılan incelemede icradaki mızrap vuruşları, parmak baskıları ve çeşitli süsleme teknikleri nota ve yazım yolu ile açıklanmaya çalışılmıştır. İcra üzerinden yapılan inceleme sonucunda çalgının unutulmuş olduğu düşünülen, kendine has icra üslubuna dair çıkarımlarda bulunulmuştur. Buradan yola çıkılarak alt mızrap vuruşlarının sıklıkla kullanılması, üst açık tellere melodiye eşlik eden dem ses görevi verilmesi, üst tellerden yararlanarak oluşturulan ritmik alt yapı ile icraya dinamiklik kazandırılması çalgının önemli icra özellikleri olduğu anlaşılmıştır. Ek olarak icranın melodik ve ritmik olarak zenginleşmesinde, mevcut notaların daha küçük notalara/nota gruplarına bölünüp, bölünen nota/nota gruplarının açık tellerden de yararlanılarak icra edilmesinin önemli etkisi olduğu görülmektedir. Yapılan bu çalışma ile çalgının sosyal, kültürel ve akademik alanda daha çok yer almasının sağlanması ve kullanım alanının artırılması amaçlanmıştır.
Peningkatan Kompetensi Guru dalam Menyusun Proposal Penelitian Tindakan Kelas melalui Workshop dan Pendampingan
Authors: Moerni Sri 
Published: April 2022

Tujuan penelitian adalah meningkatkan kompetensi guru dalam menyusun proposal PTK melalui workshop dan pendampingan bagi guru SMAN 10 Yogyakarta tahun pelajaran 2020-2021. Metode penelitian yang digunakan adalah Penelitian Tindakan Sekolah. Di dalam penelitian ini dipaparkan sebab akibat yang ditimbulkan oleh perlakuan, memaparkan apa saja yang terjadi ketika perlakuan diberikan, dan memaparkan dari awal pemberian perlakuan sampai dampak dari perlakuan tersebut. Adapun sumber utama penelitian ini adalah 5 orang guru yang berada di golongan IVa. Hasil Penelitian menunjukkan bahwa: 1) melalui workshop dan pendampingan rata-rata nilai produk proposal pada siklus 1 adalah 88,34, rata-rata perolehan nilai produk proposal pada siklus 2 adalah 81,80 dan rata-rata perolehan nilai produk proposal pada siklus 3 adalah 77,76. Sedangkan nilai rata-rata siklus 1, 2 dan 3 adalah 82,63. Berdasarkan data di atas, dapat disimpulkan bahwa rata-rata nilai dari siklus 1 ke 2 terjadi penurunan sebesar 6,54, sedangkan nilai pada siklus 2 ke 3 terjadi penurunan sebesar 4,04. Rata-rata penurunan nilai, dari siklus 1, 2 dan 3 sebesar 5,29. 2) Penelitian dilaksanakan dalam 3 siklus, setiap siklus diawali dengan workshop dan dilanjutkan dengan pendampingan penyusunan proposal. Workshop pada setiap siklus dimaksudkan untuk memberikan materi kepada peserta berkaitan dengan penyusunan bab 1, 2 dan 3. Pendampingan kepada peserta dilakukan setelah pelaksanaan workshop. Melalui workshop dan pendampingan dalam penyusunan proposal PTK ini, proposal bab 1 sampai bab 3 dapat berhasil diwujudkan dengan baik.
Discovery Learning Berbantuan Virtual Chemistry Laboratory untuk Meningkatkan Hasil Belajar Siswa
Authors: Hendrajanti Paulina 
Published: April 2022

Penelitian ini bertujuan meningkatkan hasil belajar siswa pada materi Titrasi Asam Basa di kelas XI MIPA 1 SMAN 4 Yogyakarta dengan menerapkan model Discovery Learning berbantuan Virtual Chemistry Laboratory tahun pelajaran 2020/2021. Metode penelitian yang digunakan adalah penelitian tindakan kelas dengan mengadopsi model Kurt Lewin yang setiap siklusnya terdapat kegiatan perencanaan, pelaksanaan, pengamatan, dan refleksi. Pelaksanaannya dua siklus dan tiap siklus terdiri dari dua kali pembelajaran daring. Subjek kegiatan ini adalah siswa kelas XI MIPA 1, dengan data awal hasil belajar pengetahuan dan ketuntasan klasikal di masa pandemi di bawah KKM. Alat/instrumen untuk pengumpulan data berupa lembar observasi, instrumen penilaian tes dan non tes, skala Likert, dan dokumentasi. Hasil penelitian menunjukkan: (1) Pada siklus I hasil belajar aspek pengetahuan = 85,70%; aspek keterampilan = 88,16%; aspek sikap = 81,63 %; ketuntasan belajar klasikal = 94,44%, (2) Pada siklus II hasil belajar aspek pengetahuan = 86,44%; aspek keterampilan = 92,72%; aspek sikap = 83,19%; ketuntasan belajar klasikal = 94,44%. Simpulan penelitian adalah penerapan Discovery Learning berbantuan Virtual Chemistry Laboratory sangat melibatkan aktivitas mental dan keterampilan sehingga dapat meningkatkan hasil belajar siswa pada materi Titrasi Asam Basa di kelas XI MIPA 1 SMAN 4 Yogyakarta tahun pelajaran 2020/2021.
Penerapan Model Project Based Learning Berbantuan Moodle E-Learning untuk Meningkatkan Prestasi Belajar Bahasa Inggris
Authors: Sugiharyanti Endang 
Published: April 2022

Eksplorasi ini berencana untuk lebih mengembangkan prestasi belajar pengganti yang diarahkan dengan penggunaan model Project Based Learning (PjBL) berbantuan Moodle E Learning. Ujian ini adalah Penelitian Tindakan Kelas (PTK) dengan artikel pengujian siswa kelas XII TKR A SMK Negeri 1 Ponjong. Ujian diarahkan dalam 2 siklus, mulai dari menyusun, melaksanakan, memperhatikan, merefleksi, dan memodifikasi. Strategi dan perangkat berbagai informasi dimanfaatkan dalam eksplorasi ini adalah Instrumen soal (test) yang di upload di Moodle E Learning. Sedangkan untuk keterampilan writing dan speaking, peserta didik mengumpulkan tugasnya melalui alamat link google form. Selanjutnya penanganan informasi dilakukan secara kuantitatif dengan pemeriksaan informasi peserta didik yang memperoleh nilai KKM dan analisis nilai prestasi siswa biasa. Hasil Itulah yang ditunjukkan oleh penelitian belajar dengan penerapan model Project Based Learning berbantuan Moodle E Learning berhasil lebih baik. Hasil penelitian menunjukkan bahwa pembelajaran dengan penerapan model Project Based Learning berbantuan moodle E- Learning bekerja lebih Bagus. Hal ini dibuktikan dengan peningkatan prestasi belajar Bahasa Inggris, dilihat dari persentase ketuntasan prestasi belajar pengetahuan 77%, selanjutnya persentase ketuntasan prestasi belajar writing 83% dan persentase ketuntasan prestasi belajar speaking meningkat menjadi 83%.
Aplikasi Pengolahan Data Sertifikat Tanah Pada Kantor Badan Pertanahan Nasional Kabupaten Bireuen Berbasis Java
Authors: Iqbal Iqbal , Rahman Wahyu Ahmad 
Published: April 2022

Badan Pertanahan Nasional (BPN) Kab Bireuen Mempunyai beberapa divisi, sala satunya divisi sertifikasi pertanahan. Pengolahan data sertifikat pertanahan yaitu kegiatan pendaftaran tanah untuk pertama kali secara serentak yang meliputi semua objek pendaftaran tanah yang belum didaftar dalam wilayah atau bagian wilayah suatu desa/kelurahan karena masih menggunakan cara konvensional yaitu dengan mencatat pada media pembukuan sehingga memerlukan waktu yang cukup lama dalam proses pengolahan data, selai itu dalam pengarsipan data sering terjadi kerusakan bahkan kehilangan data hal tersebut dinilai tidak efektif dan tidak efisien. Penelitian ini bertujuan untuk menghasilkan sebuah aplikasi yang dapat mempermudah staf sertifikasi pertanahan dalam melakukan pengolahan data serta pencarian arsip yang diperlukan sehingga tidak membutuhkan waktu yang cukup lama. Dengan adanya aplikasi pengolahan data berbasis java yang dapat membantu mempermudah proses pengolahan data pada badan pertanahan nasional kab Bireuen divisi sertifikasi pertanahan. Untuk itu diperlukan sistem yang dapat mempermudah kinerja karyawan dalam perlakuan pengolahan data. Sistem yang dimaksud adalah Sistem Pengolahan Data Pendaftaran Permohonan Hak Atas Tanah. Aplikasi ini dibangun dengan menggunakan bahasa pemrograman java netbeans dan menggunakan database mysql. Sehingga data yang tersimpan lebih aman dan terjaga.
Synthesis, structure and anticancer activities of Zn(II), Cd(II) complexes with 5,7-dichloro-8-hydroxyquinoline-2-carboxaldehyde-4-methyl-3-thiosemicarbazone
Authors: Ninh Thi Minh Giang  , Nguyen Thi Bich Ngoc  , Le Thi Hong Hai  
Published: April 2022

Two new complexes [Zn(QMS)] and [Cd(QMS)] were synthesized by reaction between MCl2 (M = Zn, Cd) with 5,7-dichloro-8-hydroxyquinoline-2-carboxaldehyde-4-methyl-3-thiosemicarbazone (H2QMS). Their structures were determined by ESI-MS, IR and 1H NMR spectroscopies. The results showed that in these complexes the ratio of M(II) : H2QMS ligand is 1 : 1, M(II) is bound to H2QMS ligand through O, Nquinoline, Nthiosemicarbazide and S atoms. The complexes were tested for cell in vitro cytotoxicity on human cancer cells including KB, Hep-G2, LU and MCF-7. The results showed that ZnQMS complex exhibits high antitumor activities on KB, Hep-G2, Lu cancer cell lines with IC50 values 9,41; 5,53 and 6,73 μM respectively. CdQMS complex gives a high activity against on LU cancer cell line with IC50 value 4,54 μM.
Removal of methylene blue from aqueous solutions by internal microelectrolysis on the Fe-Cu materials
Authors: Do Tra Huong  , Nguyen Van Tu  , Nguyen Anh Tien  , Nguyen Phuong Chi  , Doan Van Kiet  
Published: April 2022

Fe-Cu material is made by chemical plating method. Materials Fe-Cu is used removal of methylene blue from aqueous solution by internal microelectrolysis. The results show that with optimal conditions for methylene blue decomposition is pH of 4, contact time of 120 minutes, material weight of 1.67 g/L, shaking rate of 300 revolutions per minute (rpm), methylene blue removal efficiency is 93.63 %, with the initial concentration is 245.11 mg/L. The process of decomposition of methylene blue by Fe-Cu material follows the assumed second order kinetic equation with reaction rate constant k = 0.0023 min-1. L.mg-1, The results show that materials Fe-Cu can be applied to remove methylene blue from aqueous solution by internal microelectrolysis
O3-type layered Ni-rich cathode: synthesis and electrochemical characterization
Authors: Nguyen Le Minh  , Nguyen Van Hoang  , Bach Le Thuy Trang  , Tran Van Man  , Le My Loan Phung  
Published: April 2022

Ni-rich layered oxides are currently the state-of-the-art material of Lithium-ion batteries due to the balance between the cost, power and energy density. In this work, Ni-rich O3-type NaxNi0.76Mn0.14Co0.10O2.04 (NMC) material was synthesized by the conventional solid-state reaction and investigated as a cathode material for sodium-ion batteries. Rietveld refinement shows that the material is high purity O3-type layered oxide of >91%. In the charge/discharge test, the material was provided the reversible capacity of 156 mAh.g-1 initially at 0.1 C with 50% capacity retention after 50 cycles in the voltage range of 2.0 – 4.2 V. In addition, this material also demonstrates great rate-capability with the discharge capacity of 50 mAh.g-1 even at 5 C. Therefore, NMC material could be a promising candidate for high energy sodium-ion batteries.
Synthesis and properties of YVO4:Ho and YVO4:Ho,Bi luminescent nanomaterials by combustion method
Authors: Nguyen Vu  , Nguyen Thi Thoi  , Pham Duc Roan  , Nguyen Manh Hung  , Lam Thi Kieu Giang  , Dinh Manh Tien  
Published: April 2022

YVO4:Ho and YVO4:Ho,Bi nanophosphors were synthesized via combustion synthesis using urea as fuel and metal nitrates as precursor. Structures, morphologies and optical properties of YVO4:Ho and YVO4:Ho,Bi nanophosphors annealed at 900 °C were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescent (PL) and photoluminescent excitation (PLE) spectra. The clearly YVO4 tetragonal phase was obtained. The average diameters for the phosphor particles are 20-30 nm. The nanophosphors could be excited by 320 nm which correspond to the VO4 absorption and then PL spectra of YVO4:Ho and YVO4:Ho,Bi nanophosphors are described by the 5F8, 5S2 – 5I8, 5F5 – 5I8 và 5F4, 5S2 → 5I7 transitions of Ho3+ ions at 543, 655 and 755 nm. The effects of Ho3+ and Bi3+ concentrations on structure and optical properties have been investigated.
Sn doped Hematite Nanorods for High-Performance Photoelectrochemical Water Splitting
Authors: Truong Thi Hien  , Vu Thi Bich  , Phan Thi Binh  , Mai Thi Thanh Thuy  , Man Minh Tan  , Nguyen Tien Dai  , Tran Thi Trang  , Chu Thi Thu Hien  , Chu Van Tuan  , Nguyen Thi Nguyet  
Published: April 2022

Photoelectrochemical water splitting is of great attention due to its environmentally friendly generation of clean fuels. Hematite (α-Fe2O3) is considered a promising candidate due to its intrinsic properties for the high-performance photoelectrochemical electrode, such as favorable bandgap (2.0–2.2 eV), a suitable energy band position non-toxicity, low cost, and excellent chemical stability. Herein, we report about Sn-doped hematite nanorods and their implementation as photoanodes for photoelectrochemical water splitting. We provide the simple but efficient route to incorporate the Sn into the hematite without structural damage in the nanostructure and scrutinize the effect of Sn dopant on the photoelectrochemical activity of the hematite. Sn can be successfully incorporated into the hematite by the two-step heat treatment process, which reveals the enhanced photoelectrochemical responses compared with undoped hematite. We elaborate on the effect of Sn dopant in the hematite on the photoelectrochemical activities, thereby suggesting the optimum concentration of Sn dopant.
Synthesis, characterizations and the photocatalytic ability of Co1-xZnxFe2O4 spinels prepared by combustion method
Authors: Nguyen Xuan Dung  , Phan Thi Minh Huyen  
Published: April 2022

In this research, Co1-xZnxFe2O4 (x=0-0,5) spinel ferrites were synthesized at 5000C by combustion method using glycine and metal nitrates. The powder samples were characterized by thermogravimetric and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX). X-ray analysis showed that all samples have single phase cubic spinel structure. Structural parameters of spinels were also determined from XRD datas. The lattice constants, cell volumes increased with the increase in zinc substitution. The average crystallite sizes of the particles were determined with Zn content from 11 to 16 nm. The TEM images reveals the spherical shapes of nanoparticles with an average particle size less than 20 nm. The photocatalytic activity of the spinels were tested by the degradation of methylene blue (MB) in aqueous solution under visible light. The results showed that Zn doped spinels exhibited higher photocatalytic activity than CoFe2O4. Among all the samples, the maximum degradation efficiency was achieved by the 0.4 Zn substituted cobalt ferrite.