bluuebunny/crossref_metadata_2025 huggingface dataset:
Otel Çalışanlarının Stres ve Bireysel Performans İlişkisinin İncelenmesi
Authors: ALP Gamze
Published: June 2019

Bu araştırmada stres puanları ile bireysel performans arasındaki ilişkinin incelenmesi

amaçlanmıştır. Bu amaca uygun olarak araştırmada ilişkisel tarama modeli kullanılmıştır.

Araştırmanın örneklemini, 2016 yılının Nisan ve Mayıs aylarında Antalya merkezdeki beş yıldızlı

otel çalışanları oluşturmaktadır. Araştırmada çalışanların stres puanlarını hesaplamak için

“Mayerson stres kaynağı ölçeği” kullanılmıştır. Çalışanların bireysel performanslarının

değerlendirilebilmesi için de “bireysel performans ölçeği” kullanılmıştır. Araştırmada sosyal stres

vericiler, kendini yorumlama biçiminden kaynaklanan stres vericiler, işle ilgili stres vericiler ve

fiziki çevreden kaynaklanan stres vericiler değişkenlerinden oluşan veri setlerinden elde edilen

stres puanları ile, temel performans ve başarı performansı değişkenlerinden oluşan bireysel

performans ölçeği veri seti arasındaki ilişki kanonik korelasyon analizi ile incelenmiştir. Kanonik

korelasyon analizi sonucunda, stres puanları ve bireysel performans arasında anlamlı pozitif ilişki

tespit edilmiş ve sosyal stres vericilerden alınan puanlar değişkeni ile bireysel performans

arasında pozitif bir ilişki bulunmuştur. Bu da, çalışanların sosyal stres vericilerden aldıkları

puanlar arttıkça bireysel performanslarının da artığını göstermektedir.
Twitter’da Siyasal Katılım Ölçeği (TSKÖ)
Authors: GÜLER Şakir , SEZGİN Murat
Published: June 2019

Demokratik sistemin temel yapı taşı olan siyasal katılım davranışı gelişen teknolojiyle birlikte

birçok farklı biçimde gerçekleştirilebilmektedir. Sosyal medyada gerçekleştirilen yeni nesil

katılım fonksiyonları bu biçimlere örnek gösterilebilir. Gerek kamusal alanın sosyal

mecralarda hayat bulması, gerek sosyal platformların sunduğu olanaklar, siyasal katılım

davranışı açısından önem taşımaktadır. Dolayısıyla bu çalışmanın amacı Twitter’ın sunmuş

olduğu siyasal katılım olanaklarını bünyesinde barındıran “Twitter’da Siyasal Katılım

Ölçeğini” geliştirmektir. Gerekli bilirkişiler eşliğinde lisansüstü eğitim seviyesine sahip

katılımcılar üzerinde çeşitli aşamalar kaydedilerek anket formu oluşturulmuştur.

Gerçekleştirilen analizler nihayetinde geliştirilen ölçeğin 5 fakt.rlü bir yapıya sahip olduğu

g.rülmüştür. Birinci faktörde 6, ikinci, ü.üncü ve d.rdüncü faktörde 4, beşinci faktörde 3 item

yer almaktadır. İlgili boyutlar sırasıyla “siyasal ifade”, “politika takip”, “yerel yönetim ve

yardım” ve “siyasal tartışmalara katılma” boyutu olarak isimlendirilmiştir. Ölçeğin

Cronbach’s Alfa güvenilirlik katsayısı alt boyutlar için sırasıyla 0.92, 0.89, 0.84, 0.83, 0.81’

tür. Ölçeğin geneline dair güvenilirlik katsayısı ise 0.94’tür. Oluşturulan ölçek formu

Twitter’da gerçekleştirilen siyasal katılım davranışlarını ölçebilecek niteliktedir. Toplumsal ve

siyasal alan için oldukça önem arz eden sosyal medya platformlarında gerçekleştirilen siyasal

katılım davranışlarının anlamlandırılabilmesi ve yeni nesil katılım biçimlerinin ortaya

koyulması adına geliştirilen ölçeğin önem taşıdığı düşünülmektedir.
Okul Öncesi Eğitim Kurumlarına Devam Eden Çocukların Oyun Davranışlarının İncelenmesi
Authors: UYGUN Nur , KOZİKOĞLU İshak
Published: June 2019

Bu araştırmanın amacı, 2017-2018 öğretim yılında okul

öncesi eğitim kurumlarına devam eden çocukların oyun davranışlarını

incelemektir. Bu araştırmada, betimsel tarama modeli kullanılmıştır.

Araştırmanın örneklemini, tabakalı örnekleme yöntemi kullanılarak belirlenen

521 çocuk oluşturmaktadır. Araştırmada, okul öncesi eğitim kurumlarına devam

eden çocukların oyun davranışlarını belirlemek amacıyla “36-71 Aylık Çocuklar

İçin Oyun Davranış Ölçeği” kullanılmıştır. Araştırma verilerinin analizinde

betimsel istatistikler (ortalama, standart sapma) ve fark analizleri

kullanılmıştır. Araştırmanın sonucunda, okul öncesi eğitim kurumlarına devam

eden çocukların sosyal oyun davranışlarını sıklıkla, paralel oyun

davranışlarını bazen, tek başına ve itiş kakışlı oyun davranışlarını nadiren

sergiledikleri, sessiz davranışı ise neredeyse hiç sergilemedikleri sonucuna

ulaşılmıştır. Erkek çocukların kız çocuklara göre itiş kakış oyun

davranışlarını daha çok sergiledikleri; anne eğitim düzeyi yükseldikçe

çocukların sosyal oyun davranışlarını daha çok sergiledikleri; fakat çocukların

oyun davranışlarının yaş, kardeş sayısı, baba eğitim düzeyi, aile gelir düzeyi

değişkenlerine göre anlamlı düzeyde farklılaşmadığı sonucuna ulaşılmıştır. Okul

öncesi öğretmenlerinin oyun etkinliklerini daha etkili yürütebilmeleri için

çeşitli seminer ve hizmet içi eğitim programlarının düzenlenmesi önerilebilir.
Knowledge, attitude and practices about adverse drug reaction among medical students in a medical college: an observational study
Authors: . Roshi , Tandon Vishal R. , Gupta Brij M.
Published: June 2019

Background: Adverse Drug Reactions (ADRs) are usually associated with drugs which may or may not go unnoticed. ADRs are of great concern for any health care set up as they directly or indirectly add to the cost of treatment, prolongation of treatment, hospital stay or sometimes may even cause death. Spontaneous ADR reporting forms an important part of pharmacovigilance.Methods: An observational study was carried out in a medical college to know the knowledge, attitude and practice being followed by them in a Medical College.Results: In present study all the students had knowledge about ADRs. Only 86.7% of the students knew how and where to report an ADR. 73.3% of the students knew who can report an ADR and they had visited ADRM centre but only 60% of the students knew which ADR is to be reported. 88% of the students had an attitude that it is important to report an ADR and 86.7% told that it is useful to report an ADR. 99.3% of the students had never reported an ADR. Only 1.4% of the students had really visited ADRM centre of their institution but none of the students had ever visited wards or OPDs to look for ADRs. 26.7% of the students said that they will report an ADR if they see it ever.Conclusions: There is good knowledge about ADRs and ADRM centre among students, but it needs to bring ADR reporting into practice by actively doing hands on workshops or by adding this exercise into practical curriculum.
Physico-chemical properties and antibacterial drug performance of amoxicillin from streets in Bamenda, Cameroon
Authors: Teke Gerald N. , Junior Christian V. , Tamekou Stephen L. , Nkengla Penn-Edelqueen W. , Kuiate Jules R.
Published: June 2019

Background: The advent of microbial drug resistance creates a concern about the quality of anti-infective drugs. The rise in some microbial resistance to therapy has urged us to investigate physico-chemical properties and antibacterial performance of amoxicillin from streets in Bamenda, Cameroon.Methods: Amoxicillin samples were purchased from street vendors in Bamenda. Cameroon. Visual inspection was done for defects and signs of discoloration, deterioration or other physical disfiguration. Weight uniformity test for each sample of antibiotic tablet was carried out. The time for drug disintegration for each sample of amoxicillin was evaluated. Microbial antibiotic susceptibility tests were done using both the agar disc diffusion and micro well broth dilution methods to check drug performance. Data analysis was done and comparison checked with Student-Newman-Keuls at p<0.05.Results: The mean weight of amoxicillin drugs ranged from 632.00±11.5 to 748.06±17.9 mg. Tablets from Austria had a significant decrease in weight compared to those from Germany and Nigeria. This was similar with the capsules from India and China. Average disintegration varied significantly from as small as 2.2 to 14.4 minutes. All the amoxicillin samples were active against the tested bacteria with mean zones of inhibitions ranging from 8.33±0.57 to 39.33±0.57 mm. The MICs and MBCs values range from 1 to 64 µg/ml. For the same bacterium the growth inhibitory effects of the various drugs were not all similar.Conclusions: Some of the amoxicillin samples studied in this paper showed significant differences in their weights and performances (antibacterial activities). Probably the required amount of API was not respected.
Switching Circuit Optimization for Matrix Gradient Coils
Authors: Kroboth Stefan , Layton Kelvin J. , Jia Feng , Littin Sebastian , Yu Huijun , Hennig Jürgen , Zaitsev Maxim
Published: June 2019

Matrix gradient coils with up to 84 coil elements were recently introduced for magnetic resonance imaging. Ideally, each element is driven by a dedicated amplifier, which may be technically and financially infeasible. Instead, several elements can be connected in series (called a “cluster”) and driven by a single amplifier. In previous works, a set of clusters, called a “configuration,” was sought to approximate a target field shape. Because a magnetic resonance pulse sequence requires several distinct field shapes, a mechanism to switch between configurations is needed. This can be achieved by a hypothetical switching circuit connecting all terminals of all elements with each other and with the amplifiers. For a predefined set of configurations, a switching circuit can be designed to require only a limited amount of switches. Here we introduce an algorithm to minimize the number of switches without affecting the ability of the configurations to accurately create the desired fields. The problem is modeled using graph theory and split into 2 sequential combinatorial optimization problems that are solved using simulated annealing. For the investigated cases, the results show that compared to unoptimized switching circuits, the reduction of switches in optimized circuits ranges from 8% to up to 44% (average of 31%). This substantial reduction is achieved without impeding circuit functionality. This study shows how technical effort associated with implementation and operation of a matrix gradient coil is related to different hardware setups and how to reduce this effort.
PREVALÊNCIA DE DISTÚRBIO PSÍQUICO MENOR E FATORES ASSOCIADOS EM ENFERMEIROS INTENSIVISTAS
Authors: Nascimento Deise Dos Santos Silva , Barbosa Gabriella Bené , Santos Cleide Lucilla Carneiro , Martins Júnior Davi Félix , Sobrinho Carlito Lopes Nascimento
Published: June 2019

Objetivo: estimar a prevalência e os fatores associados aos Distúrbios Psíquicos Menores em enfermeiros intensivistas. Método: estudo de corte transversal, censitário, exploratório, realizado em nove Unidades de Terapia Intensiva de sete hospitais de uma grande cidade do interior da Bahia, Brasil, no período de julho a novembro de 2016. Utilizou-se um questionário validado, autoaplicável e não identificado. Resultados: observou-se associação com as variáveis: idade, carga horária total de trabalho; carga horária de trabalho, plantão noturno, duplo vínculo e tipo de Unidade de Terapia Intensiva; e consumo de álcool. Conclusão: a prevalência estimada foi de 24,6% com elevada prevalência de Distúrbios Psíquicos Menores na população estudada. 

Descritores: Sofrimento Mental. Enfermeiros. Unidades de Terapia Intensiva.
Tribunal de Justicia de la Comunidad Andina Confirma la decisión de Colombia de reconocer marcas de color: Proceso 01-AI-2017
Authors: Guzmán Diego
Published: June 2019

El Tribunal de Justicia de la Comunidad Andina decidió sobre la Acción de Incumplimiento presentada en contra de Colombia por otorgar dos marcas de color. El caso fue parte de la estrategia del demandante, Acava Limited, para evitar que su competidor, Postobón, usara el de forma exclusiva el color pantone 183C para de identificar sus bebidas. La decisión rechazó los argumentos de Acava, confirmando así la posición de Colombia para otorgar marcas de color delimitadas por formas.
La dimensión jurídica de la energía eléctrica y las energías renovables en México
Authors: Bonilla Cora S. , Cordero Jorge M.
Published: June 2019

El artículo analiza el marco regulatorio de la energía eléctrica en México a partir de las exigencias derivadas del cambio climático como un discurso implícito en el marco jurídico internacional. Con la inclusión en la reforma energética de 2013, de la generación de electricidad mediante fuentes renovables y la creación de un marco normativo e institucional en materia ambiental y cambio climático, se buscó avanzar hacia el cumplimiento de estos imperativos. Si los retos aún persisten, esta investigación se centra en las distintas modalidades de operación autorizadas para la generación de energía limpia, ya que el Estado tiene además el deber de asegurar la prestación del servicio de forma eficiente, con el fin de mantener sus objetivos de carácter social.
THE SOCIAL STRATA SYSTEM AND ITS IMPACT ON WOMEN'S SOCIAL ROLE IN THE PROPHETIC AND CALIPH ERA (610-661 AD)
Authors: Masruri Muhammad Hadi
Published: June 2019

The outlook against women defining her role in the domestic sector still prevails to this day in Islamic society, especially in Middle East countries where some consider that Islam is against women's role in the public sector. Therefore, this study concludes that the expansion of Islamic empire and the conquest of new lands in the caliphate era, especially in the era of 'Uthmân ibn 'Affân has affected some. For example the uncontrollably rise of Jawârî in the center of Islamic government Medina, conquering new territories, the impossibility of identifying women and other neighbors, the limited activity for women in domestic sector, as well as the Prophet PBUH’s duty to marry his wives to reduce the women’s role in that era. This study attempts to prove that social class system in society has significant impact on social role played by Arab women at that time. It also affects the formation of social relation pattern for women. The higher the social classes of women, the more freedom for aristocratic women Chandeliers in playing a keyrole in many social activities, including intervention in war and expropriation, as well as enjoying the high degree of access to human right in social role that other women cannot enjoy. This is what happened in the era of the Prophet and Caliph.
Drinking Plain Water Before Having Breakfast Lowers Body Weight in Obese Male Adolescents
Authors: Gracia Vera Viviana Deo , Indarto Dono , Tamtomo Didik Gunawan
Published: June 2019

ABSTRACT
Drinking plain water can increase daily energy expenditure and decrease total energy intake. This study aimed to analyze the effects of drinking plain water before eating steamed rice with high glycemic index (GI) at breakfast, on body weight (BW) and blood glucose level (BGL) in obese male adolescents. Twenty male adolescents aged 15-18 years old and had BMI for age > 85 percentile participated in this randomized control trial study. Ten male students in G1 group drank 250 ml plain water before eating 180 g steamed rice with high GI and 10 male in the other group (G2) drank the same amount of water after eating the same rice for breakfast for 7 days. Paired and independent t tests were used to analyze BW and BGL in both groups with p value < 0.05. Mean BW change in G1 was significantly different from mean BW changes in G2 (p=0.006), whereas mean fasting and 1h after meal BGLs changes of both groups were similar. Drinking water before having breakfast reduces BW in obese male adolescents.

ABSTRAK
Minum air putih dapat meningkatkan pengeluaran energi harian dan mengurangi total asupan energi. Penelitian ini bertujuan untuk menganalisis pengaruh minum air putih sebelum sarapan nasi kukus dengan indeks glikemik (IG) tinggi terhadap berat badan (BB) dan kadar glukosa darah (KGD) pada remaja putra dengan obesitas. Dua puluh remaja putra berusia 15-18 tahun dan IMT/U > 85 persentil berpartisipasi dalam penelitian randomized control trial study ini. Sepuluh remaja putra kelompok K1 minum 250 ml air putih sebelum sarapan 180 g nasi kukus dengan IG tinggi dan 10 remaja putra kelompok K2 minum air putih dalam jumlah yang sama setelah sarapan nasi yang sama selama 7 hari. Uji t berpasangan dan independen digunakan untuk menganalisis BB dan KGD pada kedua kelompok dengan nilai p <0,05. Rata-rata selisih perubahan BB pada kelompok K1 berbeda secara signifikan daripada rata-rata selisih perubahan BB pada kelompok K2 (p = 0,006) sedangkan rata-rata KGD puasa dan 1 jam posprandial sama pada kedua kelompok. Kesimpulan: Minum air putih sebelum sarapan nasi menurunkan BB pada remaja putra dengan obesitas.
Pojokbelia : The Study of Smart Phone Application Development as Communicative, Informative and Educative (KIE) Media Innovation for Adolescent Reproductive Health
Authors: Kusumawardani Lita Heni , Jauhar Muhamad , Rasdiyanah Rasdiyanah , Desy Rohana I Gusti Ayu Putu
Published: June 2019

Introduction: The increase of adolescent population globally and nationally makes adolescent as vulnerable group to health problems, especially reproductive health. Adolescent has curiosities, like challenges, and dare to take risks. The impact is unwanted pregnancy, sexual transmition diseases, and abortion. Therefore, there is a need of KIE media for adolescent reproductive health based on information technology: smart phone applications.

Objective: To identify research articles on smart phone use as KIE media for adolescent reproductive health.

Method: Literature study in 20 journals through Google Scholar, Proquest, and EBSCO in the last 5 years, keywords adolescent reproductive health, health education, smartphone application. Data are analyzed in tables contain title, author, year, methodology, result, and recommendation.

Result: Smartphone application as KIE media for adolescent reproductive health effectively increased the connection of adolescents with parents and health workers, improved sexual transmition diseases screening, was more attractive and innovative, took into privacy, was accurate information, wider reach, easy access, affordable costs, interactive, practical, and appropriate to the needs of today's adolescent.
Conclusion: Smartphone applications such as text message, social media, and website can open adolescent access to get fast and accurate health information. The media development needs to focus on the characteristics and needs of adolescent and can be integrated with adolescent health programs.
Cytotoxicity, Antiproliferative and Apoptotic Effect of n-Hexane Fraction of Lime Parasite (Dendrophtoe pentandra)
Authors: Subandrate Subandrate , Diba Masayu Farah , Salni Salni , Triwani Triwani , Nita Sri
Published: June 2019

Breast cancer is one of the biggest causes of death in women in the world. Lime parasite (Dendrophtoe pentandra (L.) Miq.), a folk remedy used by Indonesian people, is believed to be efficacious as anticancer drug. This research aims to know the activity of n-hexane fractions of lime parasite in inhibiting the proliferation and apoptosis of T47D cells in vitro. Cytotoxic test with MTT method assay from n-hexane fractions used a multilevel concentration. Antiproliferative test was carried out by the method of MTT assay and cell doubling time was calculated at the time of duplication. Apoptotic test was done with concentration of 1 IC50and ½ IC50which was analyzed by flow cytometry. The results reveals that fractions of lime parasite have cytotoxic activity with concentration of IC50is included in moderatecytotoxic level. The result of the doubling time of the optimum fraction of n-hexane is in 31 hours with the concentration of ¼IC50. Results for the flow cytometry shows the fraction of n-hexane does not induce apoptosis in cells of T47D.  Those results show that the active fraction of lime parasite has cytotoxic activity which is able to inhibit proliferation, but does not induce apoptosis of T47D cell.
Protective Effect of Ethanol Extract of Celery (Apium graveolens L) on Kidney Damage in Ischemia/ Reperfusion Injury Rats Model
Authors: Afifah Afifah , Muflikhah Khusnul , Ati Viva Ratih Bening , Tsani Rizki Maulana , Khasanah Dairotul , Maulana Watub
Published: June 2019

Ischemia/ reperfusion injury (IRI) is marked by the sudden decrease of blood supply to the kidney followed by restoration of blood flow. Ischemic acute kidney injury (AKI) is the leading cause of morbidity and mortality. Therefore, the prevention strategy for decreasing the damage due to IRI is required. Celery (Apium graveolens L) is often consumed as food. Celery has antioxidant and anti-inflammatory effects. This study aimed to investigate the protective effect of the celery on kidney damage in the kidney ischemia/ reperfusion injury rat model.  Twenty-five rats male, 2-3 months old Sprague Dawley were divided into 5 groups: Group 1  was sham operation, group 2 was ischemia/ reperfusion injury (IRI), group 3, 4, 5 were IRI and 250 mg/kgBW, 500 mg/kgBW, 1000 mg/kgBW of ethanol extract of celery respectively for 14 days before and 3 days after operation. Blood serum sample was taken 3 days after the operation for measuring urea, creatinine, superoxide dismuthase (SOD) and nitrite oxide (NO). Hematoxylin-eosin (HE) staining was utilized to examine kidney tubular injury score. Data were analyzed using One-way ANOVA (p<0,05). The ethanol extract of celery at dose 1000 mg/kgBW prevented the increase of urea, creatinine serum, kidney tubular injury score and prevented the decrease of SOD, NO in the kidney ischemia/ reperfusion injury rat model (p<0,05). In conclusion, the ethanol extract of celery has a protective effect on kidney damage in the ischemia/ reperfusion injury rat model.
A Cytotoxic Compound from n-Hexane Fraction of Lantana camara Linn Leaves
Authors: Suryati Suryati , Malasari Yuni , Efdi Mai , Mardiah Elida
Published: June 2019

In this study, one triterpenoid compound from n-hexane fraction of Lantana camaraLinn leaves has cytotoxic activity was isolated. Isolation was carried out using gravity chromatographycolumnand purification by recrystallization method. Isolated compound was obtained white solid with melting point 252-253oC. The structure of isolated compound was elucidated using spectroscopic analysis Ultraviolet (UV), Infrared (IR), 1H-Nuclear Magnetic Resonance (1H-NMR), 13C-Nuclear Magnetic Resonance (13C-NMR) Heteronuclear Multiple Bond Connectivity (HMBC),  Heteronuclear Multiple Quantum Correlation (HMQC), Distortionless Enhancement Polarization Transfer (DEPT) and comparative literature data, identified as Lantadene A (22β-angeloyloxy-3-oxoolean-12-en-28-oic-acid) with molecule formula C35H52O5. The Lantadene A compound was evaluated for cytotoxic activity against shrimp larvae Artemia SalinaLeach using Brine Shrimp Lethality Test(BSLT) method, showed strong cytotoxic activity with an LC50value of 48.97 µg/mL.
Gray Level Image Threshold Using Neutrosophic Shannon Entropy
Authors: Patrascu Vasile
Published: June 2019

This article presents a new method of segmenting grayscale images by minimizing Shannon's neutrosophic entropy. For the proposed segmentation method, the neutrosophic information components, i.e., the degree of truth, the degree of neutrality and the degree of falsity are defined taking into account the belonging to the segmented regions and at the same time to the separation threshold area. The principle of the method is simple and easy to understand and can lead to multiple thresholds. The efficacy of the method is illustrated using some test gray level images. The experimental results show that the proposed method has good performance for segmentation with optimal gray level thresholds.
Iatrogenic Hip Instability After Hip Arthroscopy: Is There a Role for Open Capsular Reconstruction?
Authors: Gehrman Max , Cornell Max , Seeley Mark
Published: June 2019

Case:

A 23-year-old female athlete presented with postoperative hip pain and laxity following 3 arthroscopic hip procedures.

Conclusions:

Open reconstruction of the anterior hip capsule with Achilles allograft can correct arthroscopy-induced hip laxity.
Surgical Reconstruction of an Open Medial Malleolus Fracture Using a Novel Technique
Authors: Kow Ren Yi , Yuen Jin Chuan , Ahmad Alwi Akmal Azim , Abas Muhammad Firdaus , Low Chooi Leng
Published: June 2019

Case:

A 17-year-old male sustained an open fracture of the right medial malleolus (MM) with significant bone and soft tissue loss following a motor-vehicle accident. Following serial wound debridement, his ankle was effectively reconstructed with MM antiglide plate stabilization, iliac autogenous bone graft, and a free radial forearm soft tissue flap.

Conclusions:

Open MM fracture with bone and soft tissue loss is rare. It is feasible to treat this injury with a novel surgical reconstruction technique involving autogenous bicortical iliac bone graft and radial forearm free flap.
Developing the student worksheet with problem-solving approach to improve critical thinking skills and the concept understanding of physics
Authors: Trisnowati Eli , Sumardi Yosaphat
Published: June 2019

The study aimed to investigate the quality of the developed student worksheet with a problem-solving approach in line to the determined criteria and the improvement of students’ critical thinking skills and the conceptual understanding of physics by implementing the student’s worksheet. This study was a research and development study by applying the development model by Borg & Gall. The try out subjects of validation product were students of grades X and XI of MAN (Islamic High School) Yogyakarta III. The data collection techniques used validation sheets, observation sheets, evaluation sheets of student’s worksheet, and tests. The product of this research was student’s worksheet with a problem-solving approach on the topic of optical instruments for grade X of senior high school. The evaluation of student’s worksheet by experts, teachers, peer reviewers, and students are at the best categories for learning, construct, and technical aspects. The gained standard score of students’ conceptual understanding and students’ critical thinking skills for grade X who learned through student’s worksheet with a problem-solving approach, called treatment class, were higher than students who learned without student’s worksheet with a problem-solving approach, called control class.
Identifikasi penguasaan konsep fluida statis pada siswa
Authors: Puspita Wanda Indriana , Sutopo Sutopo , Yuliati Lia
Published: June 2019

Abstract: A good conceptual understanding can help students in solving a problem, because with good conceptual understanding can precisely know the appropriate concept to be used in solving a problem. Static fluid is one of the most complex and fundamental topics in physics learning. However, there are still misconceptions experienced by students regarding this material such as the buoyant force and pressure principle. Therefore, an evaluation of static fluid material for students who have followed this material learning beforehand, to know whether the concept has been precise and meaningful. The method used is qualitative descriptive in the form of qualitative analysis and quantitative analysis to see the percentage of conceptual understanding of 100 students in SMAN 1 Turen. Percentage conceptual understanding on fluid static material can be described as follows, as much as 33,2% student still wrong concept, 40% of student already understood concept and 26,8% student still did not give the reason.

 

Abstrak: Penguasaan konsep yang baik dapat membantu siswa dalam memecahkan suatu permasalahan, karena dengan penguasaan konsep yang baik dapat secara tepat mengetahui konsep yang sesuai untuk digunakan dalam memecahkan suatu permasalahan. Fluida statis merupakan salah satu topik dalam pembelajaran fisika yang cukup kompleks dan mendasar. Namun masih saja terdapat miskonsepsi yang dialami oleh siswa mengenai materi ini misalnya tentang gaya apung dan prinsip tekanan. Maka dari itu diperlukan evaluasi mengenai materi fluida statis bagi siswa yang telah mengikuti pembelajaran materi ini sebelumnya, untuk mengetahui apakah konsep yang dimilikinya sudah tepat dan bermakna. Metode yang digunakan adalah deskriptif kualitatif berupa analisis kualitatif maupun analisis kuantitatif untuk melihat presentase penguasaan konsep 100 siswa di SMAN 1 Turen. Persentase penguasaan konsep siswa pada materi fluida statis dapat dijabarkan sebagai berikut, sebanyak 33,2% siswa masih salah konsep, 40% siswa sudah paham konsep dan 26,8% siswa masih tidak mengemukakan alasannya.
The analysis of mirror pattern bands synthesized in patients with neurological disorder during Oligoclonal immunoglobulin isoelectric focusing electrophoresis
Authors: Wang Jin Ling , wang peichang
Published: June 2019

Background

The analysis of oligoclonal band (OCB) of cerebrospinal fluid is of vital importance for the clinical diagnosis and differential diagnosis of neurological disease. However, there still exists limited knowledge about the interpretation of the mirror pattern bands (one of OCB results) for the neurological disorders during the clinal courses. In this study, we thoroughly analyzed the 12 patients with mirror pattern bands combined with laboratory and clinical information in order to explore the clinical implications of mirror bands as much as possible.

Methods

Matched CSF and serum specimens were obtained from 5892 patients with various neurological disorders who were required to lumber puncture for OCB analysis over the past four years in the Neurological Special Examination Laboratory of XuanWu Hospital. A total of 12 patients with mirror pattern bands were screened out from the 5892 patients. Serum immunofixation electrophoresis (IFE) was then performed on the 12 patients respectively in order to tentatively explore the correlation with M protein. We also collected the clinical and laboratory information of the 12 patients in great detail.

Results

All three types of mirror patterns are closely connected with M protein from peripheral serum. However, not all patients with the mirror patterns present positive M protein. 7 out of 12 patients (58.3%) were finally diagnosed as blood system-related diseases. None of the 12 patients were diagnosed with Multiple Sclerosis (MS).

Conclusions

Great emphasis should be taken on the mirror pattern bands during the isoelectric focusing electrophoresis (IEF). The mirror pattern bands combined with the result of M protein will greatly contributes to the differential diagnosis of neurological disorder.
The Frequency of Fluoroquinolone Resistant Enterotoxigenic Escherichia coli from Stools of Diarrheic Children in Ebonyi State, Nigeria
Authors: David Ebuka , Yameen MA , Igwenyi IO , Iroha IR , Nzelibe HC , Shuaibu MN , Magaji RA , Onwe OS
Published: June 2019

Enterotoxigenic Escherichia coli (ETEC) is an important cause of acute childhood diarrhea. The evaluation of ETEC in children is important for therapeutic and economic purposes. Hence, this study aimed to evaluate the frequency of ETEC among diarrheic children, their multidrug and fluoroquinolone resistant pattern. A total of twenty diarrheagenic E. coli (DEC) isolates were gotten from hundred diarrheal samples using biochemical and molecular methods. Multiplex PCR was used to detect the presence of four different pathological types of DEC. Disk diffusion method was used to determine the antibiotic susceptibility of the organisms. Biofilm formation was detected by thiazoylblue tetrazolium bromide dye in a 96-well plate. Results showed that ETEC represented 30% of the DEC, of which 80% were multidrug and fluoroquinolone resistant. The biofilm production abilities of all the ETEC were found to exist within weak, moderate and strong biofilm producers. We observed a high ETEC frequency and rapid emergence of multidrug/fluoroquinolone resistance, suggesting that it is one of the most important causes of frequent drug resistant diarrhea in children in this region.
Employing marketing mix to increase the efficiency of CRM within organic products marketers in Jordan
Authors: Fahmi Al-Zyoud Mohammad
Published: June 2019

Marketing mix appeared to be one of the most influential approaches on the marketing plans in the organizations. The current study seeks to examine the influence of marketing mix (4Ps – promotion, price, place and product) on the efficiency of CRM (responsiveness, empathy, customer relations, assurance and reliability) within the organic products market in Jordan. The researcher employed the quantitative approach through distributing a questionnaire on total of 37 individuals who were involved in the marketing field of organic products. The results of the study indicated that marketing mix appeared to have an influence of the efficiency of CRM practices within the marketing of organic goods in Jordan. The most influential variable appeared to be the price, which is considered to be high for organic product in Jordan, and that is why customer tend to avoid such product. Following the price came the variable of product, which was important as customers tend to give much emphasis on the specifications of the product and the fact that it is healthy and organic tends to appeal them regardless of the price. The study recommended increasing the level of awareness regarding organic products marketing strategies among the marketing managers in Jordan.
A study on economic factors affecting credit ratings of Indian companies
Authors: Mamilla Rajesh , Mehta Mehul , Shukla Abhijay , Agarwal Piyush
Published: June 2019

The objective of the research carried out is to understand the impact of selected economic variables (such as Crude Oil Price, GDP, Industrial Production, Exchange Rates, and Inflation) on credit rating of Indian companies.The sample comprises of 120 rating observations during the period 2012–2016 for a total of 24 companies of India.Measurement of central tendency – descriptive statistics is used where credit rating is used as dependent variable and five economic factors viz. Crude Oil Price, GDP, Industrial Production, Exchange Rates, and Inflation as the independent variables. Results from the analysis indicate that the credit rating responds in both linear, as well as nonlinear manner, to selected economic factors. Economic factors such as GDP, Industrial Production, and Exchange Rates have a linear relationship to credit rating, whereas Crude Oil price and Inflation have a non-linear impact upon the credit rating.
Industrial Revolutions and their impact on managerial practice: Learning from the past
Authors: Kohnová Lucia , Salajová Nikola
Published: June 2019

Technological changes that come with industrial revolution have largely affected businesses, as well as society. With the current technological shift and Fourth Industrial Revolution, many questions arise regarding the impacts and effects on current ways businesses operate. This study presents a retrospective analysis and overview of previous industrial revolutions. The aim of the retrospective analysis is to identify common characteristics that may lead to lessons learned for the forthcoming Fourth Industrial Revolution and thus complement the current debate on technological change. All previous industrial revolutions have led to change in business environments and new challenges for managers and owners. The findings show that all previous revolutions have led to increase in the number of service jobs created. The key approach of successful countries during the times of industrial revolution has included education as the source of new skills and knowledge necessary for adaption. Countries that were able to produce high skilled people could not only invent, but also adapt to new technologies sooner than others. Similarly, these approaches included introduction of new managerial practices in order to be able to utilize new technologies and new skilled workers effectively. The research article processes secondary data together with literature review on this topic.
Development of offers on application of additional jet impact on the fixed pitch propeller for the purpose of rational use of the power of the main engine
Authors: Osovskii Dmitrii , Sharatov Aleksey
Published: June 2019

The choice of the design operational points of the main engine to achieve the design speed of the ship determines the efficiency of the propulsion plant. At the same time, the limits recommended by the engine manufacturer for selecting the design operational points do not fully take into account current trends and can be changed. The problem of the rational use of the nominal power and specified maximum continuous rating power of the main engine operating on a fixed pitch propeller is relevant.
Load Analysis of pitch bearing considering non-quenching zone
Authors: Gui J. X. , Wang G. B. , Zhou Z.
Published: June 2019

The pitch bearing of the MW-class wind turbine has a weak zone which is not quenched. In the complicated service environment of the wind turbine, the pitch bearing often has breakage accidents in the non-quenching zone. Firstly, this paper takes the pitch bearing as the object and establishes the pitch bearing model with weak zone. Subsequently, the load variation law of the pitch bearing considering non-quenching is analyzed in the four extreme conditions. Finally, the feasibility of the model is proved by comparing the simulation data with the data obtained from the theoretical formula.
On vibrotransportation of a material on a surface performing rotary oscillations
Authors: Blekhman I. I. , Vasilkov V. B. , Semenov Yu A.
Published: June 2019

The problem is formulated for the motion of a solid body (material particle) along a rough flat surface that performs rotary harmonic oscillations as a solid body around an axis lying in or outside the plane. This problem is of interest when designing new process machines to be used in the processing of natural and technogenic materials. It is also directly applicable to the problem of transportation of loose goods by sea in rolling conditions. The paper considers continuous motion of a particle along a vibrating surface without separation. The nonlinear differential equation obtained is significantly more complicated than the equation for the case of translational surface oscillations, which is well studied in the existing literature. This complication is due, in particular, to the presence of the centrifugal force of inertia and the Coriolis forces, as well as to the time dependence of the angle of inclination of the plane. The case when these forces may be neglected is considered in detail. It is shown that application of effective parameter values allows reducing the problem to the case of translational vibration. It is also shown that the motion laws for a body under rotary oscillations are significantly different from those applying to the motion under translational vibration. They must also be taken into account when analyzing the behavior of loose cargo on sea vessels in rolling conditions.
Vibration recycling technologies for mining and mineral processing waste for construction purposes
Authors: Samukov Alexandr , Cherkasova Margarita
Published: June 2019

The problem of waste generation and recycling in the production of building crushed stone is considered. A comprehensive approach is proposed, involving developing of new technologies based on the application of vibration effects. The main scientific novelty of the solutions consists in the wide use of vibration effects and equipment to solve the most complex technology problems, in the same time with the substantiation of technological conditions and ingredients compositions. The results allow improving the grade of commercial crushed stone, while reducing the output of crushing screenings, and recycling of the screenings with the production of high-grade graded artificial sand and vibration compacted products based on this sand. A technology is developed for utilizing the dust-like component of the waste for the production of mineral wool. The environmental effects from the proposed technological solutions are evaluated.
Method for the study of dynamic characteristics in the mechanisms of motion transmission
Authors: Mironova Lubov , Kondratenko Leonid
Published: June 2019

The process of motion transmission in mechanisms consisting of two links connected by straight stems is considered. The Zener phenomelogic model was used, where the phenomena of relaxation and retardation are taken into account. It is shown that the elastic properties of a substance should be considered as a complex function. A new system of differential equations is presented, which explicitly describes the oscillations of the speeds of movement and stresses in the body. It is shown that the new method allows to take into account the degree of distribution of the parameters of force lines, and for short lines it makes it possible to describe the dynamics with simple expressions.
Vibration analysis of perforated plate in non-stationary motion
Authors: Tipans Igors , Viba Janis , Vutukuru Shravan Koundinya , Irbe Martins
Published: June 2019

Fluid, non-stationary rigid body interaction is a commonly occurring phenomenon seen in many engineering practices. The article offers a new method using laws of classical mechanics for obtaining simplified analytical relations in analysis and optimisation tasks without using space time programming methods. In the proposed method the fluid space around the rigid body prisms is divided into two zones, pressure and suction (vacuum). The method is extensively discussed which is further extended for calculation of interaction forces and coefficients for non-stationary perforated plate with total area of perforations maintained at half the area of the complete flat plate. Experiments were performed for perforated plate in an Arm-field wind tunnel at constant speed of 10 m/s. The present work offers analysis and synthesis of specific engineering task of energy extraction from fluid in a unique way by making use of external fluid flow over a perforated plate. The fluid is assumed continuous and incompressible.
The dynamic-selfsimilar lattice as the vibroisolation systems
Authors: Banakh Ludmila
Published: June 2019

The vibroisolation properties of the lattices with dynamic-selfsimilar structures are investigated. The concept of dynamic-selfsimilarity (dynamic fractal) is introduced. It consists in the similarity of the elastic-inertial parameters of the forming cells (in contrast to the geometric scaling). It was shown that such structures are equivalent in frequency to the periodic structure with additional fixation, but the nature of the wave propagation in them is significantly different. The elastic waves propagation in dynamically self-similar lattices is investigated. It is shown that in such lattices there is a decrease in the level of a harmonic signal in the all frequency ranges, and in the non-pass band the signal attenuation is significantly higher than in the lattices with a periodic structure.
Mechanics of robot inspector on electrical transmission lines conductors: performance analysis of dynamic vibration absorber
Authors: Bahrami Mohammad Reza , Abed Salam Ahmed
Published: June 2019

The aim of this paper is to create a mathematical model of the movement of electrical transmission lines inspection robot while moving on the line. In this model, the electrical line is considered as a stretched string while the robot considered as a moving load on the line. The obtained equation of motion has been solved by using the Lagrange equation. Even the motion of the inspection robot on the line is steady, but dangerous vibrations in the vertical plane of the motion have been observed. These types of oscillation may cause parametric oscillations in the perpendicular plane since the robot-inspector considered as moving load and pendulum. To achieve dynamical stability during the movement of inspection robot on the electrical line and avoid dangerous oscillation, dynamic vibration absorber has been designed. Then the performance of dynamic vibration absorber has been investigated.
Vibration technology research achievements of the Mekhanobr scientific school and their practical implementation
Authors: Vaisberg Leonid
Published: June 2019

A brief overview of the achievements of the Mekhanobr Institute in the field of the theory and design of vibration processes and machines is given. The main theoretical works cover the discovery and development of the theory of self-synchronization of rotating bodies, the development of the theory of vibrational displacement, the creation of new analytical approaches to studying the effects of vibration on nonlinear systems and media – vibrational mechanics and vibrational rheology; the discovery and research into a number of nonlinear vibration effects, the development of the theory of vibrational classification. The main applied developments include the creation of a new class of highly efficient vibration machines (crushers, screens, separators, flotation machines, etc.), the development of respective design methods, the creation of a set of laboratory vibration equipment and a unique experimental base. The developments of recent years are considered in detail.
Numerical simulation of the effect of flange radial length on strain growth of cylindrical containment vessels
Authors: Hu Yunhao , Gu Wenbin , Liu Jianqing , Liu Xin , Han Yangming , Xu Jinglin , Wang Zhenxiong
Published: June 2019

In this paper, the effect of radial length of flange on the strain growth in the elastic range of the cylindrical shell is studied by numerical simulation using LS-DYNA. It is found that the influence of the flange length on the first strain peak is small. As the radial length of the flange increases, the bending disturbance of the various frequencies of the cylindrical shell is excited which makes the linear modal coupling response is enhanced, so that the strain growth factor is increased. When more high-frequency parts are introduced into the strain response, the strain growth time will be correspondingly shortened. Therefore, it is recommended to use a flange as small as possible when designing the explosion containment vessel.
Dynamic analysis of impact on needle valve assembly
Authors: Zhang Xinyu , Yan Xiong , Wu Hao , Yang Yang , Luo Yan , Zhou Xiaojun
Published: June 2019

Use dynamics theory to establish finite element model of the needle valve assembly of marine diesel engine in the LS-DYNA and transient analysis calculation by explicit solving method. Analyze the time series diagram of equivalent stress of the impact surface and classify the impact phase according to the kinetic theory. Finally, the strength check is performed in the phase where the influence of the impact is most affected by analyzing the calculated equivalent stress results.
The use of an extended set of key texture features Haralick in the diagnosis of plant diseases on leaf images
Authors: Tutygin V. S. , Al-Vindi Basim Х. М. А. , Leliuhin D. O.
Published: June 2019

Proposed method based on fuzzy logic, including the operation of calculating the 36 key parameters of the R, G, B, RG, RB, GB color components of the original RGB color space images of plant leaves and the GLCM adjacency matrix, forming fuzzy conclusions about the type of plant disease, defusing using threshold binarization and majority voting on 6 parameters.