bluuebunny/crossref_metadata_2025 huggingface dataset:
Simulation research into the influence of the combustion chamber blowby on the efficiency of a diesel engine
Authors: KOSZAŁKA Grzegorz , GĘCA Michał , SUCHECKI Andrzej
Published: July 2021

Combustion chamber leakage, caused mainly by blowby, results in a reduced engine performance and higher fuel consumption. The blowby rate is, to some extent, determined by the design of the piston-ring-cylinder assembly (PRC) and the blowby rate varies throughout the life of an engine due to wear of the said assembly. The paper presents a quantitative evaluation of the influence of the combustion chamber blowby on the engine performance and fuel consumption on the example of two diesel engines: older generation naturally aspirated indirect injection diesel engine and a modern turbocharged direct injection engine. The assessment was made based on a simulation research using the AVL Boost software and the input data for the calculations were ascertained based on measurements performed on actual objects. The results have shown that a reduction of the blowby by half compared to the values occurring in engines of good technical condition would increase the maximum torque and power by approx. 0.5% for both investigated engines. The results of the simulation have also shown that increases in the blowby occurring in engines after long service lead to increased fuel consumption from 1% to 7% and the lower the engine speed and load the greater theses values.
Potentials for NOx and CO2 reduction of combined NSC + passive SCR system in Diesel passenger car application
Authors: WITTKA Thomas , HOLDERBAUM Bastian
Published: July 2021

The stringent pollutant and CO2 emission limitation in upcoming legislation norms for Diesel passenger car applications force the introduction of exhaust aftertreatment systems with maximum purification and energetic efficiency. The state-off-the-art technologies for NOx reduction, NOx storage and reduction catalyst (NSC) and selective catalytic reduction catalyst (SCR), show challenges for robust performance under strongly extended emission relevant operation conditions from cold start to high engine load and speed. One technical solution is the combination of NSC and passive SCR. This paper presents the experimental results obtained in the EU project “Powerful”. On engine test bench and demon-strator vehicle, an exhaust aftertreatment system combining NSC, passive SCR and fuel reformer technology was developed and experimentally investigated steady-state and on road. The engine independent NSC operation offers potentials for lowered fuel consumption penalty by avoiding engine rich operation. The intrinsic NH3 formation during the NSC regeneration is used for additional NOx conversion on the passive SCR and reduces NOx and CO2 emission.
CO2 emission level as a criterion in modern transport ship design
Authors: SZELANGIEWICZ Tadeusz , ŻELAZNY Katarzyna
Published: July 2021

From 2013 onwards Energy Efficiency Design Index (EEDI) for new ships has been in force. The EEDI value for a given ship is calculated according to a standard formula and compared against a ship specific standard by means of a so called reference line which will be gradually changing (decreasing) in subse-quent years. The article presents possible ways of increasing ship propulsion efficiency in order to de-crease ship propulsion power, EEDI value and CO2 levels.
Effect of division of initial dose on combustion parameters of a dual fuel Cl engine
Authors: STELMASIAK Zdzisław
Published: July 2021

Worsening of economic and environmental parameters of a dual fuel engine at partial engine loads results from protracted combustion of leaned gas air mixture. This leads to reduction of overall efficiency and growth of CO and THC emissions. Such problems are difficult to solve in traction engines due to theirfrequent operation at partial loads and rapid changes of engine load and rotational speed. Negative effects of leaning of gaseous mixture can be partially diminished through division of initial dose and activation of combustion of gaseous mixture through delayed injection of additional portion of liquid fuel.
In the paper are presented test results of experimental SB3.1 engine run on CNG with divided dose of the Diesel oil.
There were analyzed overall efficiency and selected parameters of combustion process. Division of the dose influenced advantageously on parameters of the engine. The overall efficiency increased, while maximal pressure pmx, heat release rate (dQ/da)muxe and pressure growth rate (dp/da)max decreased. The engine with divided dose operated more smoothly with less noise.
Numerical method of vibroacoustic estimators analysis in a frequency domain for IC engine
Authors: MERKISZ Jerzy , WALIGÓRSKI Marek
Published: July 2021

The paper describes the assessment of the main processes taking place in a IC engine. The article concerns vibroacoustic processes. Authors chosen vibration ones to the research. In view of the characteristics that the above processes have for the diagnosis of the slow andfast processes taking place during combustion, it was necessary to take into account them for periodic and on-line analyses of technical state and correctness of the engine dynamic processes run. Evaluations of the possibility of the method application were performed in the point of view of the diagnostic analysis and its use in the diagnostic system for combustion process and in the aspect of the limitation of excessive emission sources (occurred by incorrect processes runs or by functional characteristics decrease of the object or by potential failures of the elements and subassemblies during exploitation). Method analysis of vibration acceleration generated in an engine, basing on diagnostics theory use, with the help of which quantitive components obtained from the frequency-domain processes runs were searched. Diagnostic estimators were the measures of the quantity assessment, changes of which were the subject ofpresented analyses. Limits and qualification guidelines of an incorrect process are also in a paper. Diagnostic algorithms of misfire detection for the present and future vehicles combustion engines (also for hybrid vehicles) and in the aspect of OBDIII or OBMsystems application are taken into account.
Volume contraction in the process of combustion of various fuels in combustion engines
Authors: WORSZTYNOWICZ Barbara
Published: July 2021

The paper discusses the issues related to the change of volume of the reagents during the process of combustion. The formulas that were necessary to make the calculations were derivedfor liquid and gaseous fuels. Based on the formulas, theoretical calculations of the change of the kilo-mole number for various fuels depending on the mixture composition were performed. The results of the calculations were presented in the tables. Further, the influence of volume contrac­tion on the parameters of the combustion process was analyzed. In the conclusions, a comparison of the influence of the previously described phenomena on the individual fuels was performed in relation to their chemical composition and the composition of the mixture.
A research stand for the testing of the sealing properties of the piston-rings-cylinder assembly in a combustion engine
Authors: KOSZAŁKA Grzegorz , HUNICZ Jacek , KORDOS Paweł
Published: July 2021

The paper discusses research assumptions and describes a test stand for the investigations of the sealing properties of the piston rings. The research stand includes an engine brake together with a control system, a research engine and a lubrication and engine thermal state stabilization systems. The engine was fitted with a research piston containing a measuring device enabling the recording of fast varying quantities such as the pressures in the space between the rings, axial displacements of the oil sealing rings in the piston grooves and the temperatures of the gas blown through the seal.
The effect of the design and material parameters on the temperature gradient in lightweight valves in the valvetrains of combustion engines
Authors: Siczek Krzysztof
Published: July 2021

Abstract: According to the current trend to reduce the valvetrain movable masses in combustion engines lightweight valves are used increasingly. They can be made of light alloys from the TiAl alloy group or of ceramic materials such as silicon nitride. They are often coated with additional protective layers to reduce the resistance of friction or the wear intensity. They may also be a hollow structure made of steel with internal reinforcing ribs. Compared to traditional full steel valves they are characterized by different temperature gradients when working in a valvetrain. As a result, their working change, particularly the intensity of the heat transfer and wear. The paper presents valve models developed with the FEM technique for several design and material configurations for lightweight intake and exhaust valves operating under conditions similar to those made of steel. Also the temperature gradients of the discussed valves have been included and compared to those of full steel valves.
The influence of bio-depolymer fuel components on the exhaust emissions from diesel engines
Authors: SWAT Marek , MADEJ Krzysztof
Published: July 2021

The authors present the results of own research on the application of biofuels and depolymers and their mixtures with diesel fuel and the influence of this type of fueling on the exhaust emissions against standard fuel.
The authors have observed that the application of bio-depolymer fuel (BIO+DEP)/20 does not deteriorate the engine operating parameters particularly in medium engine loads and speeds. The reduction of the PM emission generated by the diesel engines caused by the investigated bio-components and fuel depolymers occurs due to a reduction of the share of the INSOL fraction in the total mass of the emitted PM. The change in the combustion process when fueled with (BIO+DEP)/20 (caused by the compensative influence of the viscosity, density and an increase in CN in particular) also results in a reduction of the exhaust emissions of the outstanding exhaust components.
Fiber optic-based in-cylinder pressure sensor for advanced engine control and monitoring
Authors: Włodarczyk Marek T.
Published: July 2021

This paper describes the design and performance of a miniature cylinder pressure sensor packaged either as a stand-alone device or integrated with a cylinder head gasket, glow plug, fuel injector, or spark plug. Benefitting from a fiber-optic based design the sensing element can operate at ultra-high temperatures and is not affected by EMI. This low cost device utilizes the principle of light intensity changes transmitted by two optical fibers upon reflection from a metal diaphragm deflecting under the effect of pressure. When the diaphragm thickness and shape are optimized, the sensor can operate up to 5 billion pressure cycles. The device is compensated for all temperature effects encountered in combustion engines, resulting from the thermal shock, engine load changes, and under-hood temperature fluctuations. Due to the diaphragm small thermal mass the sensor is subject to the thermal shock error if no heat shield is employed. While a suitable shield can almost eliminate the thermal shock error, it can get clogged in engines fuelled by diesel or landfill gas. For such engines a dual diaphragm construction offers a robust solution against soot and other combustion deposits as well as minimum thermal shock error. In comparison to a water cooled piezoelectric quartz transducer the present sensor offers the accuracy of ±1.5% of reading at pressures above 5 bars, ±0.1 bar error at pressure below 5 bars during compression, and the thermal shock error ranging from 0.1 bar to 0.3 bar dependent if a single or dual diaphragm is used. Such accuracy is possible with both stand-alone sensors as well as those 1.7 mm in diameter used in the “pressure sensing” cylinder head gaskets, glow plugs, fuel injectors, or spark plugs. This accuracy is maintained under all combustion conditions, sensor tip continuous temperatures up to 380 oC, signal conditioner temperature range of –40 oC to 140 oC, pressures up to 350 bar, and over frequency range of 0.1 Hz to 30 kHz. Such remarkable accuracy allows advanced engine controls based on highly accurate values of the Indicated Mean Effective Pressure, Mass Fraction Burned, Maximum Pressure Gradient, and Peak Pressure. Benefitting from sensor’s high accuracy at both low and high pressures the device enables closed-loop control of fuel injection as well as in-cylinder prediction of mass air flow and engine NOx emission levels.
Model research of injection of gasoline and E85 into the engine intake pipe
Authors: SZLACHETKA Marcin , WENDEKER Mirosław
Published: July 2021

The paper describes a simulated injection of PB 95 and E85 to an intake pipe. Integrated with a model of an injector, a geometric model of an intake pipe of a diameter that corresponds to real dimensions was developed with AVL FIRE software. Twenty consecutive injections of these types of fuel to the intake pipe were simulated. The studies focused on how the intensity of fuel film formation was impacted by PB 95 and E85 depending on engine speed and the pressure in the intake pipe. The paper provides selected results for several engine operating points.
Simulation studies of selected characteristics of the injection system the common rail medium-speed research engine
Authors: PIASECZNY Leszek , WALKOWSKI Mirosław
Published: July 2021

Injection Systems of Common Rail type are becoming widely used in marine engines. The aim of the research and development of these systems is to optimize the multi-injection process. The authors of the paper present the results of research on the fuel supply system of research common-rail marine medium-speed engine. The study was conducted for the nominal circulation engine speed. For the analysis were established three variants of fuel supply – a single dose, two-piece and three-piece The interdependence of measured injection parameters and their effect on engine operation have been presented in graphical form.
The assessment of the technical condition of the bearing seals of the rotor shaft in a turbine helicopter engine based on the PM content in the exhaust gases
Authors: DUTCZAK Jerzy , MAGIER Janusz
Published: July 2021

The paper presents the method of measurement of the particulate matter in the exhaust gases of a Rolls-Royce Allison 250-C20B turbine engine in the aspect of the assessment of the technical condition of the bearing seals of the rotor shaft. The tests were carried out on 4 engines using a Horiba TEOM 1105 PM analyzer fitted with a mini dilution tunnel – Micro Diluter 6100. The paper also presents the method of determining of the engine technical condition index (bearing seals) developed by the authors based on the data obtained from the measurements. The reliability of the obtained results has also been subjected to evaluation.
A comparative analysis of platinum and oxide-based catalytic converters in terms of NOx reduction with ammonia
Authors: KAMELA Wojciech , KRUCZYŃSKI Stanisław
Published: July 2021

The paper presents a comparison of the catalytic properties of two types of catalytic converters (containing platinum and oxide active coatings) in the aspect of a reduction of nitric oxides with ammonia. The tests were performed for three concentrations of ammonia in the exhaust gases of a diesel engine. The work contains images of the topography of the active surface of the catalytic converters and the results of its physical and chemical analysis. The changes of the conversion rates of the nitric oxides have also been presented in the converter temperature range from 150 to 550 °C along with the results of calculations of the shares of NO2 in NOx for all analyzed concentrations of ammonia in the exhaust gases.
The efficiency engine – cost-effective alternative to downsizing
Authors: WEISSBÄCK Michael , HOWLETT Mike , AUSSERHOFER Norbert , KRAPF Stefan
Published: July 2021

As an alternative to the familiar option of downsizing diesel engines, AVL has developed the so-called efficiency engine in collaboration with Renault. Because of the engine’s moderate power density, its peak pressure requirements are lower in some areas than those of turbocharged gasoline engines. Consequently, its mechanical friction and fuel consumption can be significantly reduced, as the comparison with a conventional and a downsized diesel engine demonstrates.
The Willingness to Pay for Improving Drinking water supply in Tamil Nadu: A Case study of tannery water pollution in Vellore District
Authors: A XAVIER SUSAIRAJ , Premkumar A
Published: July 2021

Tannery pollution and the resulting health impacts are a worldwide problem. Due to the cheap labour availability and tax pollution regulation leather tanning has become a popular export earning industry in countries like India, Pakistan and Bangladesh. Given its huge potential for export earnings and local economic livelihood especially for poor households, its adverse health impacts seem to have been ignored. Also thus far there has been no systematic economic valuation study in India. This also attempts to estimate the health cost of this industry to people including those very households that have made leather tanning their livelihood. Therefore the present research study aims to examine economic valuation of human health impact of the pollution from the tannery industry in Vellore district, using the Willingness to Pay method. Vellore district in Tamil Nadu state of India is purposively selected because of its larger number of tanneries.
Resposta Imunológica à Primeira Dose da Vacina Moderna em Profissionais de Saúde com Infeção Prévia por SARS-CoV-2
Authors: Moreira-Pinto João , Gregório Susana , Camarinha João , Soares Bruno , Cunha Ramos João
Published: July 2021

N/a.
SÜRDÜRÜLEBİLİR TASARIM YAKLAŞIMI AÇISINDAN BİYOPLASTİKLERİN İNCELENMESİ
Authors: DÜZAKIN Esin
Published: July 2021

Sürdürülebilir tasarım yaklaşımına göre tasarım alanı her ne olursa olsun, önemli konulardan biri malzeme seçimidir. Yenilenebilir kaynakların korunması, üretimi esnasında fosil kaynaklı yakıtların kullanımı, insan ve doğadaki canlı metabolizmalarına etkileri, geri dönüşüm kapasitesi, atık hale geldiğinde bertarafı esnasında ortaya çıkan materyallerin nitelikleri, kısacası çevreye etkisi, malzeme seçimini önemli kılan kriterlerdir. Plastikler o denli yaygın olarak kullanılmaktadır ki yaşadığımız çağı “plastik çağı” olarak adlandırabiliriz. Buna paralel olarak da, plastikler çevre için büyüyen bir sorun olmaya devam etmektedir. Plastiklerin neden olduğu sorunlara çözüm olacağı öngörülerek, petrol kaynaklı plastiklere alternatif olarak geliştirilen biyoplastiklerin kullanımı yaygınlaşmaya başlamıştır. “Çevre dostu” olarak tanıtılan biyoplastiklerin üretiminde kullanılan biyo-esaslı materyallerden bazıları gıda olarak da ekonomik değeri olan malzemelerdir. Dolayısıyla çevre etki değerlendirmesinde çok yönlü ve kapsamlı bir analiz gerekmektedir. Ekonomik maliyetinin yanısıra, gerek gıda güvenliğini tehdit etmesi, gerekse tarımsal üretimi sırasında kullanılan bir takım kimyasallar dengeleri değiştirebilecek faktörlerdir. Biyoplastiklerin bütünüyle petrol kaynaklı plastiklerin yerine geçip geçemeyeceği tartışılan bir konudur. Bu konuda yapılan araştırmalar petrol kaynaklı plastiklerle biyoplastikleri karşılaştırarak üstünlüklerini ortaya koysa da, gerçek hayatta çevreye etkisinin umulduğu kadar olumlu olamadığı görülmektedir. Biyoplastiklerin çevreye olan etkilerinin olumlu yönleri yanısıra olumsuz etkilerinin de tartışıldığı literatür taraması ile biyoplastiklerin sürdürülebilir tasarım yaklaşımı kapsamında daha nesnel bir gözle değerlendirilmesine katkı sağlamak amaçlanmıştır.
FOTOĞRAF SANATINDA PORTRE TİPOLOJİLERİ
Authors: GÖRGÜLÜ Eren
Published: July 2021

‘Fotoğraf Sanatında Portre Tipolojileri’ başlıklı bu makale on dokuzuncu yüzyıldan günümüze fotoğrafik portreler ile oluşturulan tipolojik portre çalışmalarını bir araya getirmeyi amaçlamaktadır. Bu amaç doğrultusunda portrelerin kapsamlı bir şekilde bir araya getirilerek oluşturulduğu fotoğraf çalışmaları makaleye konu edilmiştir. Sosyal, bilimsel ve sanatsal faaliyetleri kayıt altına almakta yararlanılan fotoğrafın antropolojiden zoolojiye, tıptan botaniğe birçok disiplin tarafından belgeleme ve görsel veri oluşturma amaçlı kullanılması konunun önemini ortaya koymaktadır. Fotoğraf sanatında tipolojik portrelerle ilgili verilere literatür taraması çerçevesinde ulaşılmış ve bu çalışmalar içerik analizi yöntemi kullanılarak incelenmiştir. On dokuzuncu yüzyıl öncü portre tipolojilerinde; Dr. Hugh Welch Diamond, Guillaume Duchenne de Boulogne, Francis Galton ve Alphonse Bertillon’un çalışmaları ilk tipolojik örnekler olarak konu açısından önemlidir. Yirminci yüzyıl fotoğraf sanatında portre tipolojisinde ise August Sander ve Walker Evans’ın tipolojileri dikkate değer çalışmalardır. Çağdaş fotoğraf sanatında portre tipolojilerinde ise Boris Mikhailov, Taryn Simon, JR, Martin Schoeller ve Angelica Dass gibi sanatçılar tipoloji yöntemini portre fotoğraflarına uygulayarak birey ve kimlik kavramlarına farklı bir bakış açısı getirmişlerdir. Sanatçıların tipolojik portre çalışmalarında portrelere yükledikleri anlamın anlatım yöntemi, tipolojik gruplandırma, ifade biçimi ve içerik teknik yaklaşım açısından analiz edilerek yorumlanmıştır. Metin içerisinde yer alan tipolojik portre çalışmaları kronolojik olarak ele alınıp değerlendirilmiştir.
Maszkok a távoktatás színházában : Képzés és fejlesztés a fekete álarcok előtt és mögött
Authors: Tóth Rita , Mitev Ariel
Published: July 2021

Az online képzések és tréningek betörtek a résztvevők otthonába, amire azok a sötétség álcájával és álarcával válaszoltak. A fekete maszkok színházában a közönség nagy része a sötétbe burkolózott online nézőtérben, fragmentáltan, individualista módon helyezkedik el, ahol egyénileg saját párhuzamos világokat is átélhet. Tanulmányunkban a maszk, a színház és a játék metaforákat hívjuk segítségül a mostani, a vírusjárvány miatti kényszerű távoktatási helyzet mélyebb megértése érdekében. A digitális oktatás otthoni börtönéből kitörni kívánó rendezők és szereplők arcszínházát feltárva bemutatjuk a maszkok szerepét és különböző funkcióit. A megoldás nem a média és marketingkommunikáció által generált perszónákban, hanem a modern strukturáltságot posztmodern keretrendszerbe helyező játékos keretek bevezetésében keresendő.
A kommunikáció jelentősége az egészségügyben : Szakirodalom-kutatás az orvos-beteg kapcsolat és a szakdolgozói team hatékonyságát befolyásoló tényezők feltárása céljából
Authors: Pintér Dániel Gergő
Published: July 2021

Ez a szakirodalmi analízis egyaránt vizsgálja az orvos-beteg, valamint az egészségügyi teamen belüli kommunikáció hatékonyságát befolyásoló tényezőket. A tanulmány elején az ún. „health literacy”-val kapcsolatos nemzetközi kutatási eredmények szintetizálására és az egészségműveltséget alkotó komponensek azonosítására teszek kísérletet, majd részletesen ismertetem az egészségügyi kommunikációval kapcsolatos főbb akadémiai elméleteket. Ezt követően a médiahasználati szokások megváltozásának egészségügyi folyamatokra gyakorolt pozitív és negatív hatásait vizsgálom, bemutatom az e-betegek legfontosabb karakterisztikáit és a napjainkban legkorszerűbb megközelítésnek számító bio-pszicho-szociális-digitális modellt. A tanulmány második fele a pácienseket követően a szakdolgozói team-re helyezi a fókuszt: nemcsak feltárja a terület korlátait, de végezetül néhány szakmai javaslatot is megfogalmaz a belső szervezeti kommunikáció javítása és a kórházi munkatársak motivációjának fejlesztésére vonatkozóan.
Az önkormányzatok által időseknek címzett online kommunikáció vizsgálata a 2020-as Covid-19 koronavírus-járvány idején : Kutatási beszámoló
Authors: Rákóczy Zsuzsanna Ágnes
Published: July 2021

A jelen cikk alapját képező #kommlab (Budapesti Corvinus Egyetem) kutatás az idősek tájékoztatását és támogatását szolgáló magyarországi önkormányzati szereplők által folytatott kommunikációt vizsgálta a 2020-as Covid-19 koronavírus-járvánnyal összefüggésben. A vizsgált intézmények köre kiterjedt a fővárosi és valamennyi budapesti kerületi önkormányzatra, a megyei jogú városok, valamint a magyarországi településtípusok számbeli megoszlását alapul véve, azzal arányosan további városok és kistelepülések önkormányzatára.
A szovjet-kommunista sajtómodell sajátosságai és korszakai Magyarországon 1956 és 1990 között
Authors: Kékesdi-Boldog Dalma
Published: July 2021

A magyar államszocializmus évei alatt a tájékoztatáspolitika retorikai szinten mindvégig követte a marxista-leninista alapelveket és a szovjet-kommunista sajtómodellt. A tömegkommunikáció tartalmi, előállítási és terjesztési körülményei a szovjet modellhez hasonlóan szigorú pártállami irányítás és -befolyás alatt álltak. Hasonlóságot mutat a sajtó hierarchikus szervezeti felépítése is. Ugyanakkor a tömegkommunikáció gyakorlati irányítása nem követte pontosan a szovjet mintát, így a magyar tájékoztatáspolitika több lokális sajátossággal is bírt. Dolgozatomban a domináns kül- és belpolitikai tényezőkkel és a társadalmi, gazdasági problémákkal összefüggésben a Kádár-korszak tájékoztatáspolitikájának hat nagy korszakának ismertetésére teszek kísérletet.
KEPUTUSAN PETANI TERHADAP PENANGANAN PASCA PANEN JAMBU AIR DI KABUPATEN DEMAK
Authors: Triyono Triyono , Rahmawati Nur
Published: July 2021

Kabupaten Demak merupakan salah satu sentra pengahasil jambu air di Jawa Tengah.  Produksi jambu air di Kabupaten Demak mempunyai karakteristik mudah rusak dan berisiko jika terjadi panen raya. Penelitian ini bertujuan mengetahui faktor-faktor yang mempengaruhi  keputusan petani terhadap penanganan pasca panen jambu air. Sampel penelitian ini dimail sebanyak 72 petani dari tiga gapoktan yaitu Sekar Tani, Sido Maju, dan Tani Sentosa. Analisis data menggunakan metode analisis regresi logistik binomial.   Hasil analisi menunjukkan bahwa keputusan petani untuk melakukan penanganan pasca panen dipenagruhi oleh variabel umur, harga dan pekerjaan luar usahatani (off farm). Umur petani yang relatif sudah lanjut usia menyebabkan penurunan peluang keputusan untuk melakukan penanganan pasca panen. Harga dan akses jaringan kerjasama memungkinkan peningkatan peluang keputusan petani untuk melakukan penanganan pasca panen. Oleh karena itu penting dilakukan pelatihan bagi generasi muda untuk pengelolaan usahatani jambu air yang lebih baik terutama penanganan pasca panen.Kata kunci: jambu air, keputusan petani, pascapanen
PENGARUH FORMULASI NUTRISI TERHADAP PERTUMBUHAN DAN HASIL TOMAT CERI PADA SISTEM HIDROPONIK TETES
Authors: Wulansari Nur Kholida , Windriyati Ratna Dwi Hirma , Kurniawati Ari
Published: July 2021

Penelitian ini bertujuan untuk mendapatkan formulasi nutrisi  AB-Mix, pupuk organik cair dan pupuk hayati pada sistem hidroponik tetes untuk tanaman tomat ceri. Penelitian dilakukan di screen house di Dusun Gunungmalang, Kecamatan Serang, Kabupaten Purbalingga pada ketinggian 1400 m dari permukaan laut pada bulan Agustus – September 2020. Perlakuan dicoba yaitu P1(100% dosis AB-Mix), P2 (75% dosis AB-Mix + POC + pupuk hayati), P3(50% dosis AB-Mix + POC + pupuk hayati), P4 (25% dosis AB-Mix + POC + pupuk hayati), dan P5 (0% dosis AB-Mix + POC + pupuk hayati). Rancangan perlakuan yang digunakan yaitu rancangan acak kelompok (RAK) dengan 6 ulangan. Variabel yang diamati adalah tinggi tanaman dan jumlah cabang. Hasil peneltian menunjukkan formulasi nutrisi 75% AB Mix + POC + Pupuk Hayati dapat digunakan untuk mengurangi penggunaan nutrisi AB-mix pada budidaya tomat ceri sistem hidroponik tetes pada media cocopeat. Kata kunci: formulasi nutrisi, hidroponik tetes, tomat ceri
APLIKASI KOMPOS DAN PENAMBAHAN BAHAN ORGANIK TERHADAP PERTUMBUHAN DAN HASIL SELADA PADA ULTISOL
Authors: Febriyono Wahyu , Rahmah Affiatin
Published: July 2021

Gulma siam memiliki potensi untuk dijadikan pupuk kompos yang dapat digunakan pada tanaman selada di tanah ultisol. Penelitian ini bertujuan untuk : mengevaluasi penggunaan kompos gulma siam di tanah ultisol dan menentuka dosis terbaik untuk pertumbuhan tanaman selada di tanah ultisol. Penelitian ini menggunakan rancangan acak kelompok lengkap. Perlakuan yang dicoba adalah jenis pupuk kompos (P1 danP2), kemudian dosis yang digunakan (D0, D1, D2, dan D3). Variabel yang diamati adalah : tinggi tanaman, jumlah daun, bobot segar tanaman, bobot kering tanaman, bobot segar akar, bobot kering akar, total panjang akar, luas daun, laju asimilasi bersih dan laju pertumbuhan tanaman. Dari hasil penelitian diambil kesimpulan bahwa : tanaman selada tumbuh baik di tanah ultisol dengan pupuk gulma siam, dosis D2 adalah dosis terbaik untuk pertumbuhan tanaman selada di tanah ultisol.Kata kunci: kompos gulma siam, selada, ultisol
PENDUGAAN MODEL LUAS DAUN TANAMAN PAKCOY (Brassica rapa L.) DENGAN REGRESI KUANTIL
Authors: Rusdiana Riza Yuli , Widuri Laily Ilman , Restanto Didik Pudji
Published: July 2021

Luas daun merupakan salah satu parameter penting untuk menentukan produksi pakcoy (Brassica rapa L). Pengukuran luas daun secara non-destruktif salah satunya dapat dilakukan dengan pendekatan model persamaan matematika melalui regresi kuantil. Penelitian ini bertujuan untuk menduga model luas daun pakcoy dengan faktor alometrik dan pendekatan non-destruktif menggunakan regresi kuantil. Metode penelitian dilaksanakan dengan mengumpulkan data sampel daun diperoleh dari tanaman pakcoy secara acak dari berbagai level kanopi tanaman pakcoy (lower, middle dan upper) dengan jumlah sampel sebanyak 163 daun. Variabel pengamatan dalam penelitian adalah lebar, panjang dan luas daun pakcoy. Metode pendugaan model luas daun dilakukan dengan pendekatan regresi OLS dan kuantil. Hasil penelitian menunjukkan bahwa model regresi kuantil dapat direkomendasikan untuk menduga luas daun pakcoy secara non destruksi dan cepat dengan ketepatan akurasi tinggi. Model yang dapat direkomendasikan untuk menduga luas daun pakcoy secara non-destruksi, sederhana, dan akurat yakni LA0.5 = 0.393 +0.705LW.Kata kunci: kuantil, luas daun, non-destruksi, pakcoy, regresi
PENGARUH FAKTOR PRODUKSI TERHADAP PRODUKTIVITAS BUNCIS PERANCIS: STUDI KASUS DI KELOMPOK TANI TRANGGULASI SEMARANG
Authors: Moek Wiwi Sepriani , Simamora Liska
Published: July 2021

Buncis Perancis merupakan salah satu komoditas unggulan yang dibudidayakan kelompok tani Tranggulasi Desa Batur, Kecamatan Getasan Kabupaten Semarang karena memiliki manfaat bagi kesehatan sehingga buncis perancis memiliki permintaan yang tinggi di dalam negeri bahkan sudah menembus pasar ekspor. Permintaan pasar terhadap komoditas buncis perancis sebanyak 1,5 – 3 ton per hari, akan tetapi volume produksi buncis perancis di kelompok tani Tranggulasi hanya 1,5 - 3 ton per minggu. Namun, permintaan yang tinggi tersebut tidak mampu dipenuhi oleh petani yang tergabung dalam kelompok tani Tranggulasi karena jumlah produksi lebih sedikit dibandingkan permintaan.  Penelitian ini bertujuan untuk menganalisis faktor- faktor produksi (luas lahan, benih, pupuk organik, tenaga kerja dan pestisida organik) yang mempengaruhi produktivitas komoditas buncis perancis dan mengetahui faktor produksi yang paling berpengaruh dalam peningkatan produktivitas buncis perancis di kelompok tani Tranggulasi, Desa Batur, Kecamatan Getasan, Kabupaten Semarang. Riset ini dilakukan bulan Agustus 2020. Sampel yang digunakan adalah anggota kelompok tani Tranggulasi sebanyak 30 orang yang ditetapkan secara purposive. Petani responden yang bergabung dengan kelompok tani Tranggulasi melakukan usahataninya dengan sistem pertanian organik. Data diperoleh dengan melaksanakan wawancara melalui daftar pertanyaan yang tertulis di dalam kuesioner. Analisis data dilakukan dengan pemodelan fungsi produksi regresi berganda dengan bantuan program SPSS 16. Hasil penelitian ini menunjukan bahwa faktor produksi luas lahan (X1), benih (X2), pupuk organik (X3), tenaga kerja (X4) dan pestisida organik (X5) secara bersama-sama (simultan) mempengaruhi produktivitas buncis perancis di kelompok tani Tranggulasi. Namun secara parsial faktor produksi pupuk organik (X3) berpengaruh positif dan nyata dalam peningkatan produktivitas buncis perancis di kelompok tani Tranggulasi.Kata Kunci: Buncis Perancis, faktor produksi  dan produktivitas.
Effect of Ethanol Extract of Green Tea (Camellia Sinensis) to Lowering Iron Level in Ferrous Sulfate Induced Male Rats
Authors: Wasito Hendri , Baroroh Hanif Nasiatul , Sandiani Yossi Respa
Published: July 2021

Green tea (Camellia sinensis) has the potential to be developed as a natural agent for therapy of iron overload in thalassemia. The purpose of this research was to observe the ability of ethanol extract of green tea as a natural iron chelating agent in animal iron overload model. Ethanol extract of green tea leave (GTLE) was prepared by maceration using 70% ethanol. Sprague-Dawley male rats were divided into three groups (5 rats each), a normal control group (group I) received daily p.o. of deionized water, the iron overload group received 100 g/Kg BW (group II) of GTLE that given two hours before ferroussulfate0.5 g/Kg BW administrations and the last group (group III) received only 0.5 g/Kg BW of ferrous sulfate. GTLE and ferrous sulfate were given orally every day for 30 days. At the end of the experimental period, rat blood serum samples were collected. Iron content and alanine aminotransferase (ALT) levels were measured using a spectrophotometer followed by observing the histologic preparation of rat liver organ. The results showed that administration of green tea leaves ethanolic extract of 100 g/Kg BW was able to keep down iron and ALT levels in the rat blood to a normal level.
The Feminine Other: Monsters and Magic in Beowulf and Sir Gawain and the Green Knight
Authors: Ghani Hana
Published: July 2021

Monsters are perceived as humanity’s enemy that should be eradicated. However, based on Jeffrey Cohen’s Monster Theory (1997), monsters play an important role in understanding humanity’s fears and anxieties. Monstrosity hinges upon the binary opposition of the Self and the Other, in which the Other is seen as a threat to the Self. With this in mind, this article addresses the female monsters of two medieval texts: Beowulf and Sir Gawain and The Green Knight. This paper aims to examine the female monsters, Grendel’s mother and Morgan the Fay, as a cultural reference to unravel the patriarchal anxieties of the time. Grendel’s mother represents a threat to the homosocial hierarchal bonds of Medieval society. Meanwhile, Morgan the Fay signifies danger to knighthood, chivalry, and courtly romance. At the same time, this paper also aims to continue the critical analysis and literature of the female characters in both texts with a heavy emphasis on their Otherness.
PERBEDAAN PREVALENSI PENYAKIT INFEKSI MENULAR SEKSUAL DI INSTALASI RAWAT JALAN RSUD Prof. dr. MARGONO SOEKARJO PERIODE 2010 – 2014
Authors: Putranti Ismiralda Oke , Primanita Citra , Karsono Lilik , Rahardjo Amelia B.
Published: July 2021

Infeksi menular seksual (IMS) saat ini menjadi masalah yang cukup besar selain karena jumlah kasus baru yang masih tinggi, juga karena IMS dapat menimbulkan gejala yang berat, infertilitas dan disabilitas baik pada laki-laki, perempuan maupun bayi. Penelitian ini bertujuan untuk mengetahui perbedaan prevalensi dan karakteristik IMS berdasarkan jenis kelamin di Instalasi Rawat Jalan (IRJ) RSUD Prof dr. Margono Soekarjo pada kurun waktu 2010 – 2014. Penelitian ini merupakan penelitian observasional analitik menggunakan data sekunder rekam medis elektronik. Hasil penelitian didapatkan jumlah kasus IMS di RSUD Prof dr. Margono Soekarjo cukup tinggi, yaitu sebanyak 511 kasus selama kurun waktu 5 tahun penelitian. Pada kasus laki-laki sebanyak 54,9% dan perempuan sebanyak 45,1% dengan puncak kejadian pada usia 20 – 30 tahun. Uretritis gonore merupakan penyakit IMS terbanyak pada laki-laki (76,8%), sedangkan kondiloma akuminata terbanyak pada perempuan (62,2%) dan tidak ada perbedaan yang signifikan diantara kedua kelompok jenis kelamin (p=0,64; p>0,05). Uretritis gonore dan kondiloma akuminata merupakan penyakit IMS terbanyak pada laki-laki dan perempuan pada penelitian ini, serta tidak adanya perbedaan yang bermakna prevalensi IMS di antara kedua kelompok sesuai dengan penelitian-penelitian sebelumnya yang menyatakan bahwa laki-laki dan perempuan memiliki kerentanan yang sama dalam terpapar IMS. Dari penelitian ini tidak ada perbedaan yang bermakna prevalensi IMS pada pasien laki-laki maupun perempuan di IRJ RSUD Prof dr. Margono Soekarjo.
FAKTOR FAKTOR YANG MEMPENGARUHI KEBERHASILAN IBU BEKERJA DALAM PEMBERIAN ASI EKSKLUSIF
Authors: Amalia Rizki , Rizki Lailatul Khusnul
Published: July 2021

Air susu ibu (ASI) merupakan makanan bayi yang terbaik. ASI tidak dapat digantikan oleh makanan atau minuman apapun walaupun ibu dalam keadaan bekerja di luar rumah, faktor faktor yang mempengaruhi keberhasilan pemberian ASI eksklusif pada ibu bekerja adalah sikap ibu bekerja, dukungan sarana, atasan dan suami. Tujuan penelitian ini adalah untuk mengetahui hubungan sikap, dukungan sarana, atasan dan suami terhadap keberhasilan ibu menyusui pada ibu bekerja. Metode penelitian yang digunakan yaitu deskriptif analitik dengan pendekatan cross sectional. Populasi dan sampel penelitian adalah ibu menyusui yang bekerja, menggunakan total sampling. Pengumpulan data dilakukan secara langsung menggunakan kuesioner tertutup dan dianalisis menggunakan uji Chi square dengan taraf kesalahan 0,05. Hasil penelitian didapatkan sikap ibu bekerja, dukungan sarana, atasan dan suami berpengaruh terhadap keberhasilan pemberian asi eksklusif oleh ibu bekerja (p<0,05). Kesimpulan penelitian ini menunjukkan hubungan yang signifikan antara keberhasilan pemberian asi eksklusif dengan sikap ibu, dukungan sarana, atasan dan suami.

 

Breast Milk is the best baby food. Breast milk can not be replaced by any other food or drink even if the mother is working outside the home. The factors that influence the success of exclusive breastfeeding in working mother are the attitude of mother, the support of the facilities, supervisor and husband. The aim of the study was to investigate the relationship of attitude, support facilities, supervisor and husband to the success of exclusive breastfeeding of working mother. The analytical descriptive with cross sectional approach was used in this study. The population and sample of the study were working mothers, with total sampling. Data collection was done directly through closed questionnaire and analyzed by Chi square test with error level 0,05. The result of this study was the attitude of working mother, support of facilities, supervisor and husband influence the succesfull of exclusive breastfeeding of working mother (p <0,05). The conclusion of the study was exclusive breastfeeding correlated to mother's attitude, support facilities, supervisor and husband significantly.
EFEKTIFITAS ANTIBAKTERI EKSTRAK BUAH NAGA SUPER MERAH (Hylocereus costaricensis) TERHADAP PERTUMBUHAN BAKTERI Streptococcus mutans
Authors: Hartomo Bambang Tri , Djati Fanny Kusuma , Oktadewi Fitri Diah , Andrianto Angger Waspodo Dias , Nugroho Prasetyo Adi
Published: July 2021

Buah naga super merah (Hylocereus costaricencis)saat ini dibudidayakan oleh Kebun Benih Holtikultura Baturaden sebagai produk unggulan yang berpotensi meningkatkan kesejahteraan masyarakat Banyumas. Buah naga super merah diyakini memiliki efek anti bakteri oleh karena kandungan polifenol yang terdapat pada daging buah maupun kulit buah naga. Penelitian ini bertujuan untuk melihat daya hambat ekstrak buah naga super merah terhadap pertumbuhan bakteri Streptococcus mutans yang merupakan salah satu pencetus terjadinya penyakit periodontal. Sebagai langkah awal, dilakukan uji determinasi buah naga super merah untuk memastikan bahwa buah naga yang digunakan adalah buah naga super merah. Selanjutnya dilakukan pembuatan ekstrak dengan metode maserasi. Hasil penelitian antar perlakuan menunjukan bahwa tidak terdapat perbedaan daya hambat bakteri yang signifikan (p>0,05) antara ekstrak buah naga super merah, kontrol positif dan kontrol negatif. Penelitian ini menyimpulkan bahwa ekstrak buah naga super merah dapat digunakan sebagai bahan antibakteri dalam terapi periodontal. Hasil penelitian ini diharapkan akan menjadi acuan untuk langkah berikutnya yaitu pengujian efek anti bakteri larutan buah naga super merah terhadap akumulasi plak pada rongga mulut.

 

Super red dragon fruit (Hylocereus costaricencis) is currently cultivated by the Baturraden Horticultural Seed Garden as a superior product that has the potential to improve the welfare of the Banyumas community. Dragon fruit is believed to have anti-bacterial effects because of the polyphenol content found in fruit flesh and dragon fruit skin. This study aims to see the inhibitory power of super red dragon fruit extract on the growth of Streptococcus mutans bacteria which is one of the triggers of periodontal disease. As a first step, a determination of dragon fruit is determined to ensure that the dragon fruit used is super red dragon fruit. Furthermore, the extract was made by maceration method. The results of the study between treatments showed that there was no significant difference in bacterial inhibition (p> 0.05) between super red dragon fruit extract, positive control and negative control. This study concluded that super red dragon fruit extract can be used as anti bacterial agent for periodontal therapy. The results of this study are expected to be a reference for the next research, analyzing the antibacterial effect of super red dragon fruit solution to the accumulation of plaque on the oral cavity
PERBEDAAN TINGKAT KEPARAHAN PSORIASIS PADA PASIEN PSORIASIS DENGAN DAN TANPA FOKAL INFEKSI
Authors: Astrid Caroline , Putranti Ismiralda Oke , Purwanti Kurniasih Dwi
Published: July 2021

Psoriasis adalah penyakit kulit yang sering dijumpai, kronik, tidak menular, terjadi akibat kelainan kompleks pada pertumbuhan dan diferensiasi epidermal serta abnormalitas multipel dari biokimia, imunologi, dan vaskular. Salah satu faktor risiko psoriasis adalah fokal infeksi. Penelitian ini bertujuan mengetahui perbedaan tingkat keparahan psoriasis pada pasien psoriasis dengan dan tanpa disertai fokal infeksi di RSUD Prof. Dr. Margono Soekarjo, Purwokerto. Penelitian ini merupakan penelitian analitik observasional dengan pendekatan cross-sectional. Subjek penelitian adalah 40 pasien psoriasis yang berobat di Poli Kulit dan Kelamin RSUD Prof. Dr. Margono Soekarjo pada bulan November hingga Desember 2017 yang memenuhi kriteria inklusi dan eksklusi. Tingkat keparahan psoriasis diukur menggunakan Psoriasis Area Severity Index (PASI). Analisis data menggunakan independent t-test. Rata-rata tingkat keparahan psoriasis pada pasien dengan fokal infeksi 28,63 dan tanpa fokal infeksi 17,29, dengan jenis fokal infeksi didapatkan fokal infeksi intraoral (47,5%) dan genital (2,5%). Perbedaan tingkat keparahan psoriasis pada pasien dengan dan tanpa fokal infeksi didapatkan p = 0,000 (p < 0,05). Terdapat perbedaan signifikan tingkat keparahan psoriasis pada pasien dengan dan tanpa fokal infeksi.

 

 

Psoriasis is a common, chronic, noncontagious skin disease, caused by complex abnormal epidermal growth with multiple abnormality of biochemistry, immunology, and vascular. One of psoriasis risk factors is focal infection. This study was an analytical study with cross-sectional approach, to establish the difference of Psoriasis Area Severity Index (PASI) in patients with and without focal infections in Prof. Dr. Margono Soekarjo Public Hospital, Purwokerto. Subjects of this study were psoriasis outpatients in Dermatology and Venereology Clinic in November until December 2017. Forty subjects who fulfilled the inclusion and exclusion criteria were measured using PASI. This study showed the average of the PASI on patients with focal infections was 28.63 and without focal infections was 17.29, with types of the focal infection were intraoral focal infections (47,5%) and genital focal infections (2,5%). The difference of PASI between patients with and without focal infections was significant with p = 0,000 (p < 0,05). There is a significant difference on degree of psoriasis between patients with and without focal infections.
HUBUNGAN FREKUENSI KONSUMSI MAKANAN CEPAT SAJI DENGAN TEKANAN DARAH PADA REMAJA SMP PERMAI
Authors: Heidy Heidy , Darvan Sebastian
Published: July 2021

Hipertensi merupakan sebuah penyakit pada orang dewasa maupun anak-anak dan remaja dengan tingkat mortalitas dan morbiditas yang tinggi. Faktor penyebab hipertensi yang dapat dimodifikasi adalah pola makan dan gaya hidup. Pola makan sering mengonsumsi western fast food yang tinggi energi, lemak jenuh, garam, dan rendah serat dapat meningkatkan risiko hipertensi. Penelitian ini bertujuan untuk mengetahui apakah terdapat hubungan antara frekuensi konsumsi makanan cepat saji dengan tekanan darah pada remaja kelas IX SMP Permai Penjaringan Jakarta Utara dengan menggunakan metode penelitian analitik potong lintang. Dari 123 responden didapatkan 40 responden jarang mengonsumsi makanan cepat saji yang terbagi dari 35 responden dengan tekanan darah normal dan 5 responden dengan tekanan darah meningkat. Dari 83 responden yang sering mengonsumsi makanan cepat saji terdapat 72 responden dengan tekanan darah normal dan 11 responden dengan tekanan darah meningkat. Tidak terdapat hubungan antara frekuensi konsumsi makanan cepat saji dengan tekanan darah pada remaja SMP Permai Penjaringan Jakarta Utara

 

 

Hypertension is a disease in adults as well as children and adolescents with high mortality

and morbidity. Causes of hypertension that can be modified include diet and lifestyle. Diet that

often consume western fast food that is high in energy, saturated fat, salt, and low fiber can increase

the risk of hypertension. This research aimed to know whether there was a correlation between

fast food consumption frequency with blood pressure among teenagers of class IX in Permai Junior

Highschool, used a cross sectional analytic study. Out of 123 respondents, we obtained 40

respondents that did not consume fast food often, there were 35 respondents with normal blood

pressure and 5 respondents with elevated blood pressure. Of the 83 respondents that consume fast

food often, there were 72 respondents with normal blood pressure and 11 respondents with

elevated blood pressure. There was no correlation between fast food consumption frequency with

blood pressure among teenagers in Permai Junior Highschool
Original Article HUBUNGAN EKSPRESI CYCLOOXYGENASE-2 (COX-2) DENGAN DISEASE FREE SURVIVAL DAN OVERALL SURVIVAL PADA PENDERITA KANKER PAYUDARA
Authors: Prihantono Prihantono , Juhamran Juhamran , Abidin Zaenal , Haryasena Haryasena , Syamsu Salman Ardi
Published: July 2021

Cyclooxygenase-2 (COX-2) berperan dalam pertumbuhan tumor dan metastasisnya yang berdampak pada buruknya prognosis. Tujuan penelitian ini untuk mengetahui hubungan ekspresi COX-2 terhadap disease free survival dan overall survival pada pasien kanker payudara. Penelitian ini bersifat observasional menggunakan desain kohort dengan periode follow up selama 24 bulan. Hasil: Ekspresi COX-2 ditemukan pada 21 sampel (42%) dari 50 pasien kanker payudara. Selama follow up 24 bulan, lama DFS pada COX-2 negatif (20,1 bulan) lebih lama dibandingkan pada COX-2 positif (14,0 bulan) dan menunjukkan hubungan yang signifikan (p<0,01). Lama OS pada COX-2 negatif (22,6 bulan) lebih lama dibandingkan pada COX-2 positif (17,8 bulan) yang juga menunjukkan hubungan yang signifikan (p<0,01). Terdapat hubungan yang signifikan antara ekspresi COX-2 dengan disease free survival dan overall survival pada pasien kanker payudara. COX-2 bisa dijadikan salah satu faktor prognostik kanker payudara.