bluuebunny/crossref_metadata_2025_split huggingface dataset:
Physico-Mechanical Properties of Plaster of Paris (Gypsum Plaster) Reinforced with Paper Pulp
Authors: Ngaaje Ngwe Nnoko 
Published: February 2022

The study was carried out on the physico-mechanical properties of plaster of Paris (Gypsum plaster) reinforced with paper pulp in order to improve the weight of plaster paste and to obtain materials of lighter weight that solve problems such as poor flexural strength, and crack propagation. To do this experiment, the considerable basis of a standard of 2 kg of plaster of Paris was taken as the test sample. Gradually plaster of Paris was substituted with paper pulp paste in a water basin in proportions K0, K1, K2, K3, K4, K5 and K6 representing the different percentages of 0%, 10%, 20%, 40%, 60%, 80%, 100% of mixture respectively. After the above observations, the following parameters on fresh and hardened samples were tested: the start time of reaction, and end time of hardening, consistency, the flexural and compressive strength, shrinkage, and apparent density. At the end of these tests, it was determined that, the incorporation of small amounts of paper pulp (2 kg samples) into the plaster paste improves its flexural properties. But from k0 to k6, properties related to bending and compression began to gradually fall which is a consequence of the augmentation of the amount of paper paste in the plaster paste. The presence of paper pulp in the plaster of Paris paste increases the time of hardening of the plaster cement from one proportion to another, reduces the workability of the mixed paste, significantly solves the problem of removal, the apparent density drops when waste paper paste is increased in the mixed plaster.
Because of its light weight, low density, its acceptable Mechanical properties, these new materials are recommended for exploitation in the manufacturing of popular lightweight construction finishing like panels for ceiling or walls, staff works and other applications.
Non-Combustion ?He Powered Propulsion
Authors: Bolivar Nelson Enrique , Vasilev Ivaylo T. 
Published: February 2022

One of the biggest hurdles nowadays rocket propulsion is the large use of fuel. The amount of fuel and the burning efficiency defines how long the rocket engine can work which intimately limits the range and the load capacity of the rockets and spaceships. This according to the Newton third law is unavoidable - in order to move forward you need to leave something behind. There have been several attempts in the past to create an engine which doesn't use fuel in the common sense, like the M drive, but so far all of them were unsuccessful. In this article we attempt to explore a novel principle, a recycling cycle of fuel, by optimizing parametrically a system that uses ?He phase transition.
Application of Augmented Water Flooding Using Ultrasound Energy to Improve Oil Recovery
Authors: Hassan U. , Adamu M. B. , Bukar I. , Muhammad M. A. 
Published: February 2022

The application of ultrasound energy in improving oil recovery is an emerging technique, it has been tested in laboratories and some field applications in different parts of the world. In this study, Nigerian crude oil of 4.21 cSt viscosity and sandstone rock samples were tested using a designed and constructed experimental rig. The rig is an analogue of a standard core flooding set up and works on the principle of fluid flow in porous media. Furthermore, a modeled equation was developed to better understand the effects of power and time on the volume of oil recovered at a constant ultrasound frequency. Results obtained show a positive impact in the recovery of residual oil during waterflooding with the assisted ultrasound energy. About 2-fold increase in the recovery of oil was observed when the ultrasound energy was applied to augment the waterflooding process. Model equations developed were found to be adequate because the adjusted and predicted R-squared values show reasonable agreement (R-adjusted = 0.9993, R-Predicted = 0.9974).
Sounding Rocket Preliminary Design
Authors: Zosimovych Nickolay 
Published: February 2022

This article aims at studying sounding rocket (SR) class, or those vehicles launched from the earth and carrying out various experiments at high altitudes. After the end of their mission, rockets should deliver a payload to a given point or to give range.
In general, design tasks are divided into direct and inverse ones. This paper focuses on direct designing tasks. In this respect, the set values are maximum range, payload mass and restrictions on the sounding rocket construction. As a result, a SR general design technique is proposed. This technique includes selection of the SR initial parameters, the number of stages, the relative weights of the fuel components, the specific thrust of the engines for each stage and the initial transverse load on the SR. After selecting the fuel composition, engine design features and rocket as an object, the starting mass can be represented as a complex mathematical function. Moreover, predetermined maximum range, rocket payload, selected fuel components, structural design, materials, design parameters allow for a definite SR weight determination. Finally, overall and power characteristics of the SR are proposed within this technique. Such characteristics are accepted as design parameters.
The Other Side: Negative Impacts of Exploiting Renewable Energy Sources
Authors: Ebube Orisa F. , Akan Etim E. 
Published: February 2022

The increasing demand for energy threatens the earth with climate change due to emission of greenhouse gases from the burning of fossil fuels. This has been the major driver for green energy. Renewable energy has the potential to reduce the negative effects of energy production on the environment at a global scale. However, the technology to harness the energy from renewable sources have only been well developed for the electricity market. Expanding the scope to supply other markets and sectors would lead to increase in demand on rare earth minerals which will reciprocally create negative environmental and socio-economic impacts. In order to mitigate such impacts, strong regulatory policies will be required to control different aspects of renewable energy sources, the scale of production and footprint on the environment. Recycling renewable energy technology is a step in the right direction. However, the cost of recycling is found to be 5 times the cost of mining. This would affect the price of energy generated from renewable energy sources on a long run. A shift from fossil fuel would imply at least 20 trillion dollars in stranded assets which would trigger a financial collapse. This collapse would possibly lead to the complete loss of the oil, gas and coal industries, power producers, insurance companies and banks that hold loans for these industries.
The Features of Electronic Conduction in InAs
Authors: Khutsishvilii E. , Chubinishvili Z. , Kekelidze G. , Kalandadze I. , Qamushadze T. , Metskhvarishvili M. 
Published: February 2022

The electrical properties of n-type crystals of InAs compound, grown from stoichiometric melt by the horizontal zone melting method, have been investigated in the temperature range of 4.2 K-300 K before and after fast neutron irradiation up to high integral fluences of 2×1018n?cm-2. At a fixed temperature electrons concentration (n) increases almost by one order during irradiation, and practically does not change with increasing of temperature. n increases only slightly by increasing of temperature near 300 K, both before and after irradiation. When ? 4×1018cm-3 the change of during irradiation is negligible. Comparison of experimental data of mobility with theory shows that the privileged scattering mechanism of electrons at 300 K is scattering on optical phonons in InAs with 1016-1017 cm-3 and scattering on ions of impurity in InAs with n~1018-1019 cm-3. The analysis shows that during irradiation point type scattering centers of donor-type structural defects with shallow levels in the forbidden zone appear. Consequently, the mobility decreases during irradiation. At 300 K in sample with electrons concentration of 3×1016 cm-3 the mobility decreases by 5 times after irradiation, which is equivalent to the formation of 1.5×1019cm-3 charged point scattering centers.
Peningkatan Stabilitas Fitokonstituen melalui Pendekatan Mikroenkapsulasi
Authors: Wati Rosa Riau , Sriwidodo Sriwidodo , Chaerunisa Anis Yohana 
Published: February 2022

Mikroenkapsulasi adalah teknologi untuk menyalut atau melapisi suatu zat inti dengan suatu lapisan dinding polimer sehingga menjadi partikel-partikel berukuran mikro. Tujuan dari mikroenkapsulasi melindungi zat inti dari pengaruh lingkungan, menutupi rasa dan bau tidak enak, menyatukan zat-zat yang tidak tersatukan baik secara fisika maupun secara kimia, menurunkan sifat iritasi zat inti terhadap saluran cerna, mengatur pelepasan inti dan memperbaiki stabilitas bahan inti. Berdasarkan hasil dari para peneliti melalui pendekatan mikroenkapsulsi. Mikroenkapsulasi dapat melindungi senyawa dari berbagai faktor lingkungan seperti oksidasi, degradasi, suhu, kelembaban dan cahaya, dapat memperpanjang umur simpan produk menutupi rasa dan bau aromatik. Dapat meningkatkan stabilitas pada senyawa yang bersifat volatil dan meningkatkan bioavabilitas, sehingga mikroenkapsulasi ini dapat digunakan sebagai pilihan untuk sediaan bahan alam berupa ekstrak, karena bahan alam berupa ekstrak umumnya memiliki stabilitas yang tidak baik, seperti mudah teroksidasi, degradasi, dan fotolisis, selain itu memiliki kelarutan yang rendah dan bioavaibilitas yang rendah. Dengan demikian melalui pendekatan mikroenkapsulasi ini dapat meningkatkan stabilitas ekstrak, melindungi senyawa aktif, dan mencegah penurunan aktivitas. Metode yang digunakan menggunakan beberapa referensi yang didapatkan dari database dan dengan instrumen pencarian online yang diterbitkan secara internasional. Referensi yang didapatkan berasal dari database elektronik seperti google scholar, sciendirect, NCBI dari tahun 2010-2020.
Factors Influencing Tax Avoidance and Tax Evasion in Nigeria: A Case Study of Wukari, Taraba State
Authors: Bako Paul Matudi 
Published: February 2022

Objective – The goal of this study is to assess several factors that influence tax avoidance and evasion in Nigeria, with a focus on Wukari, Taraba State. Particularly this study is aimed to ascertain the influence of corruption on individual tax avoidance and evasion in Nigeria, whether lack of transparency and accountability in public institutions influences individual tax avoidance and evasion in Nigeria, to examine the influence of tax system injustice on individual tax avoidance and evasion in Nigeria, and to evaluate the impact of tax system complexity on individual tax avoidance and evasion in Nigeria. Design/methodology – This study adopts a survey research design with a sample size of 308 questionnaires administered and 230 questionnaires were collected which represents 75% response rate. Descriptive statistics like mean, standard deviation and percentages, inferential statistics like multiple regressions were used. Results – It was found that corruption, lack of transparency and accountability, tax system injustice and tax system complexity all have a substantial impact on tax avoidance and evasion in Nigeria. Urgent step should be taken by public office holders in particular and government representatives in general to live above board when it comes to transparency and accountability. In addition, there should be zero tolerance for corruption within and outside the tax system; anyone found guilty of corruption should be made to face the wrath of the law. Conclusively, Nigeria government should make deliberate efforts to ensure the nation’s financial statement is published depicting our revenue as well as expenditure incurred regularly (monthly basis, quarterly or annually). Limitation/Suggestion – This study concentrated on only four factors identified to have an influence on tax avoidance and evasion in Nigeria. It is also constrained to Wukari, Taraba State which is just one amongst the sixteen local governments in the State and as such may not be applicable to other local governments within and outside the State.
ANALISIS SURVIVAL PASIEN PENYAKIT GINJAL KRONIS DENGAN TERAPI PENGGANTI GINJAL DI RUMAH SAKIT PGI CIKINI PERIODE 2015-2020
Authors: Siahaan Paskalia Clara , Astuti Putu Ayu Swandewi 
Published: February 2022

ABSTRAK
Penyakit Ginjal Kronis (PGK) telah menjadi masalah kesehatan masyarakat yang mempengaruhi sebesar 10-16% populasi orang dewasa di seluruh dunia. Tujuan penelitian ini untuk mengetahui survival pasien serta faktor-faktor yang berpengaruh terhadap survival pasien PGK yang menjalani terapi pengganti ginjal. Penelitian ini bersifat observasional analitik dengan rancangan studi hystorical cohort. Sebanyak 405 pasien digunakan sebagai kohort. Data dianalisis dengan metode Life Table, Kaplan Meier, Log Rank Test, dan uji Cox Regression. Hasil penelitian ini menunjukkan rata-rata survival pasien PGK dengan terapi pengganti ginjal adalah 50,7 bulan. Faktor yang berpengaruh bermakna terhadap survival pasien adalah kadar albumin (HR=0,499; 95% CI=0,345 – 0,846; p=0,001), umur pertama kali menjalani terapi pengganti ginjal (HR=1,027; 95% CI=0,997 – 1,041; p=0,009), dan jenis asuransi kesehatan. Penanganan yang komperhensif terhadap kebutuhan nutrisi dan peradangan diperlukan untuk meningkatkan kadar albumin pasien. Pengambilan keputusan untuk pelaksanaan terapi pengganti ginjal pada pasien usia lanjut perlu dilakukan oleh dokter untuk meningkatkan survival pasien. Edukasi kesehatan serta pengoptimalan fungsi Posbindu PTM merupakan tindakan preventif terhadap penyakit PGK. Kata Kunci: Analisis Survival, Penyakit Ginjal Kronis, Terapi Pengganti Ginjal
Increase of Carotid Intima-Media Thickness and Reduction of Carotid Artery Lumen Diameter in Breast Cancer Patient Before and After Chemotherapy
Authors: Kartika Inez , Asih Made Widhi , Martadiani Elysanti Dwi , Anandasari Pande Putu Yuli , Patriawan Putu , Widiana I Gde Raka 
Published: February 2022

Background: Increasing number of cancer survivor motivates clinical practitioner to focus on chronic effect of chemotherapy agent, especially those with vascular toxicity effect, which may attenuate the incidence of thrombosis and atherogenesis. Ultrasonography examination on carotid intima media thickness (C-IMT) provides acurate result in evaluating atherosclerotic. The purposes of this research are to find out any structural changes of carotid artery, especially atheroclerosis changes in breast cancer patient after chemoteraphy. Methods: Analytic cross sectional study using a pre post test group design in breast cancer patients. Eligible subjects undergo carotid ultrasonography examination prior to chemoteraphy and after they had completed the 3 cycles of chemoteraphy for the second exam. The examination was perfomed with the same USG machine, high frequency linier transducer (>7mHz) in B-mode under the auspecies of two reputable radiologist consultant. Results: Total patients are 26, mean of age (year) is 47.15 ± 8.11. Most dominant histopathology finding is invasive carcinoma nonspecific type, in 24 patients (92.4%) and the disease stage is in stadium III in 14 patients (53.9%). Mean C-IMT (mm) prior chemotherapy is 0.51 ± 0.06 and after chemotherapy is 0.58 ± 0.05, there is an increase of 0.07 ± 0.06 (p<0.0001). Carotid artery lumen diameter (mm) before chemotherapy is 4.05 ± 0.66 and after chemotherapy is 3.90 ± 0.73, so there is a decrease of 0.16 ± 0.40 (p =0.057). Conclusion: There is a statistically significant increase in intima media thickness of carotid wall of breast cancer patients after chemotherapy, consisted with chemoteraphy induced atherosclerosis.
REDESAIN PASAR KOPRO MENJADI PASAR BERBASIS NOL SAMPAH MAKANAN, GROGOL PETAMBURAN
Authors: Mettasari Venny , Kasimun Petrus Rudi 
Published: February 2022

Food waste is one of the ecological issues that exist in big cities. In fact, food waste is one of the biggest causes of the greenhouse effect. Food that is thrown away, if stockpiled can produce methane gas which can destroy the ozone layer which can lead to global warming. According to data from the Ministry of Environment and Forestry's National Waste Management Information System for 2017-2018, the composition of food waste in West Jakarta is the highest among other metropolitan areas with 70% of the composition of waste is food waste. Therefore, the need for handling so that food waste can be processed so that it can be reused. The proposed program aims to create a market cycle based on zero food waste which is expected to reduce environmental issues regarding the amount of food waste that is wasted, especially in the city of Jakarta. The concept used is a sustainable building that uses green architectural design methods so that it can accommodate community activities so that this building is designed to have a semi-open inner space and uses environmentally friendly materials. This market program is also supported by several other programs such as processing and community programs, small kitchens, and dining areas. Activity grouping is made based on zoning and takes into account the privacy of each activity. With this building, it is hoped that it can reduce the increase in food waste which can increase global warming. Keywords: food waste; global warming, green architecture, zero food waste marketAbstrakSampah makanan adalah salah satu isu ekologi yang terdapat pada kota-kota besar. Nyatanya, sampah makanan merupakan salah satu penyebab efek rumah kaca terbesar. Makanan yang dibuang, jika ditimbun dapat menghasilkan gas metana yang dapat merusak lapisan ozon yang dapat mengakibatkan pemanasan global. Menurut data sistem Informasi Pengelolaan Sampah Nasional KLHK tahun 2017-2018, komposisi sampah sisa makanan di Jakarta Barat merupakan yang tertinggi diantara daerah metropolitan lainnya dengan 70% komposisi dari sampah adalah sampah makanan. Oleh karena itu, diperlukannya penanganan agar sampah makanan dapat diolah agar bisa digunakan kembali. Program yang diusulkan memiliki tujuan untuk menciptakan siklus pasar berbasis nol sampah makanan yang diharapkan dapat mengurangi isu lingkungan tentang banyaknya sampah makanan yang terbuang khususnya di Kota Jakarta. Konsep yang digunakan adalah bangunan berkelanjutan yang menggunakan metode desain arsitektur hijau agar dapat mewadahi kegiatan masyarakat sehingga bangunan ini di desain memiliki ruang dalam yang semi terbuka dan menggunakan material yang ramah lingkungan. Program pasar ini pun didukung dengan beberapa program yang lainnya seperti program pengolahan, dan komunitas, dapur kecil, serta area makan. Pengelompokkan kegiatan dibuat berdasarkan zoning dan memperhatikan privasi dari setiap kegiatan. Dengan adanya bangunan ini diharapkan dapat mengurangi maraknya sampah makanan yang dapat meningkatkan pemanasan global.
LOKA: RUMPUN TERINTEGRASI KULTUR DAN AGRARI
Authors: Chan Ruth 
Published: February 2022

The world already knows Bangka Belitung as the second largest producer of tin in the world with the best tin quality. However, the post-tin mining area is dominated by tailings and pits which have physical and chemical characteristics of the soil, as well as poor microclimate conditions. The existence of rampant tin mining also leaves economic, social and ecological problems among the people of Bangka. Using qualitative research methods by paying attention to the design quality of the collage method, Loka: Cluster Integrated Culture and Agrarian is an area for local people to gather, work, and play. This project aims to be able to bring back the human admiration for nature and buildings as if helping nature to take over what was originally hers. This area acts as a medium to restore social, economic and ecological conditions that were affected during the tin mining. This area is expected to revive the dynamics and vitality of the region. Keywords: ecology; economic; revive; social; tin AbstrakDunia sudah mengenal Bangka Belitung sebagai penghasil timah terbanyak kedua di dunia dengan kualitas timah terbaik. Namun, lahan pasca tambang timah didominasi oleh hamparan tailing dan kolong yang memiliki karakteristik fisika dan kimia tanah, serta kondisi iklim mikro yang buruk. Adanya pertambangan timah yang merajalela juga menyisakan permasalahan secara ekonomi, sosial dan ekologi ditengah masyarakat Bangka. Menggunakan metode penelitian kualitatif dengan memperhatikan kualitas desain dari metode kolase, Loka: Rumpun Terintegrasi Kultur dan Agrari adalah sebuah kawasan untuk masyarakat local sendiri berkumpul, bekerja, dan bermain. Proyek ini bertujuan untuk dapat memunculkan kembali rasa kagum manusia terhadap alam dan bangunan seakan membantu alam untuk mengambil alih apa yang semula miliknya. Kawasan ini berlaku sebagai medium untuk memulihkan keadaan sosial, ekonomi dan ekologi yang terdampak selama adanya pertambangan timah. Kawasan ini diharapkan dapat menghidupkan kembali kedinamisan dan vitalitas daerah.
PENERAPAN EKOLOGI, SIMBIOSIS, DAN BIOFILIK PADA RUANG PEMULIHAN DEPRESI PASCAPANDEMI
Authors: Santika Editha , Trisno Rudy 
Published: February 2022

Good mental health is a condition when our mind is in a calm and calm state, so we can enjoy everyday life and appreciate other people around us. Depression is a mental illness with biggest cases in Indonesia that causes problems in everyday life, not only can damage interactions or relationships with other people but can also reduce achievement at school and work productivity. The purpose of this project is to provide adequate and appropriate healing facilities for patients with health problems in Jakarta with buildings that have been adapted to the pandemic era with innovations in mental health recovery through an ecological approach. The methods used to support this project are Heinz Frick's ecological building principles, Kisho Kurokawa's symbiotic method, assisted by a biophilic and healing architecture. The conclusion of this project is to create a space (building and environment) that can help with mental health healing that can be a bridge between humans and the environment and connect them as closely as possible and create a new atmosphere in this pandemic era. Keywords: biophilic; ecology; healing depression; post-pandemic; symbiosis Abstrak Kesehatan mental yang baik adalah kondisi ketika batin kita berada dalam keadaan tenteram dan tenang, sehingga dapat menikmati kehidupan sehari-hari dan menghargai orang lain di sekitar. Depresi adalah penyakit dengan pengidap paling banyak di Indonesia yang menyebabkan masalah dalam kehidupan sehari-hari, tidak hanya dapat merusak interaksi atau hubungan dengan orang lain, namun juga dapat menurunkan prestasi di sekolah dan produktivitas kerja. Tujuan dari proyek ini adalah untuk memberikan fasilitas penyembuhan yang memadai dan layak bagi pasien gangguan kesehatan di Jakarta dengan bangunan yang telah disesuaikan pada masa pandemi dengan inovasi dalam pemulihan kesehatan mental melalui pendekatan ekologi. Metode yang digunakan untuk mendukung proyek ini adalah prinsip bangunan ekologis dari Heinz Frick, metode simbiosis dari Kisho Kurokawa, dibantu pula dengan biofilik dan healing architecture. Kesimpulan dari proyek ini adalah untuk menciptakan wadah (bangunan dan lingkungan) yang dapat membantu pemulihan kesehatan mental yang dapat menjadi jembatan antara manusia dan lingkungan dan menghubungkannya sedekat mungkin dan menciptakan suasana baru di masa pandemi ini.