bluuebunny/crossref_metadata_2025 huggingface dataset:
Cultura alimentaria en torno a lactantes del medio rural: saberes heredados y aprendidos
Authors: Vásquez Ruiz Gabriela , Cruz León Artemio , González Jácome Alba , Monroy Torres Rebeca
Published: February 2021

Objetivo: Establecer un marco teórico para el estudio y comprensión de la cultura alimentaria en menores de dos años en el medio rural. Metodología: Investigación documental en revistas científicas y referencias a observación de campo. Resultados: En el medio rural, la cultura alimentaria se basa en saberes locales; practicados durante la producción, preparación y consumo de alimentos. Las decisiones las toman las mujeres principalmente (madres, abuelas e integrantes de la familia), utilizan saberes de herbolaria, pero también la información de medios de comunicación y personal de salud (que adaptan a su situación y experiencia). Conclusiones: La cultura alimentaria en el medio rural es ejercida por las mujeres, acorde o no a las recomendaciones para los menores de dos años, obedeciendo a las costumbres, así como a nuevos aprendizajes. En la toma de las decisiones alimentarias influyen también el personal de salud, los medios de comunicación y la accesibilidad a los alimentos; por lo que deben valorarse las prácticas culturales, respetar situaciones personales y no solamente las normas establecidas en atención en salud.
Efectos de un arancel ad valorem sobre importaciones de carne de cerdo en México
Authors: Rebollar Rebollar Samuel , Gómez Tenorio Germán , Martínez Castañeda Francisco Ernesto
Published: February 2021

El objetivo fue evaluar el efecto de la aplicación de un arancel de 20% aprobado por México en junio de 2018, a importaciones de carne de cerdo en canal procedentes de Estados Unidos, mediante un modelo de programación no lineal con datos de 2017. El país se dividió en ocho regiones productoras y consumidoras: Noroeste, Norte, Noreste, Centro-Oeste, Centro-Este, Sur, Oriente, Península y dos puntos de internación de importaciones, Punto de internación uno, Punto de internación dos. El análisis se realizó en producción, importaciones y consumo. Bajo condiciones óptimas el modelo subestimó la producción nacional en 3.7%, sobreestimó a importaciones y consumo en 2.4 y 0.8% con un Valor Social Neto de 4635 miles de millones de pesos. El arancel de 20% habría de incrementar producción nacional en 0.4% (4774 t), disminuir importaciones en 18.9% (19 141 t), reducir consumo en 0.6% (14 367 t) y el Valor Social Neto en 0.1% (6 mil millones de pesos). El mercado porcino mexicano, es sensible al efecto del arancel; tal política protege a productores nacionales, perjudica tanto a importadores como a consumidores y, se considera como viable a favor de la producción, si es que el objetivo gubernamental se orienta hacia ese sector.
CHRISTS AND THE THEOTOKOSES OF THE CHRIST-FAITH: THE RITUAL ROLE AND THE SACRED STATUS AS A RECORDING OF RELIGIOUS EXPERIENCE
Authors:   Andrey S. Dedov Russian Christian Academy for the Humanities, Dedov Andrey S.
Published: February 2021

This article deals with the question of the origin of Christs and the Theotokoses in the communities of Christ-Faith. Existing explanations for this phenomenon is by no means exhaustive. In this article we will attempt to confirm the very fact of deification of leaders, as well as to find out what are the reasons for the existence of this phenomenon. According to the sources which are to us, we can conclude that certain features of veneration of Christ-Faiths leaders in the 18th-19th centuries go far beyond the veneration of local saints and "teachers of faith". In some cases, the sacred status was even inherited. In order to understand the reasons behind phenomenon, it is proposed to consider the ecstatic ritual of the Christ-Faith as a psychodynamic complex, which is aimed at the generation and reproduction of powerful religious experience. A ritual drama in mystic-ecstatic practices can be accompanied by a multitude of types of experiences, among them possession trance and trance of visions...
“Reintegration over Eradication”. Programme for the Deradicalization of Islamists in Somalia. Rehabilitation Center Serendi
Authors: Nefliasheva N. A.
Published: February 2021

The article, based on open sources, examines the Programme for the deradicalization of Islamists, which has been operating in Somalia since 2013. The program, along with other local projects, is an example of ‘soft measures’ when interacting with Islamists. The article notes that the Program includes ﬁve main stages, or phases: outreach, reception, screening, rehabilitation and reintegration. The biggest problem is caused by the screening stage, when ex-ﬁghters must be classiﬁed into two groups ‘high-risk persons’ and ‘low-risk persons’. People with low risk are voluntarily sent to one of 9 rehabilitation centers. The author points out that the Serendi Center in Mogadishu provides the residents of the programme with opportunities for school education, vocational training, and psychological assistance. Sessions with imams are held in Serendi as part of the religious deradicalization programme. Center residents have the opportunity to keep in touch with their family through regular visits and weekend vacations. An important stage of the Program is the reintegration phase. The position of the leaders of the communities has a decisive inﬂuence on the success of the Programme. The author notes that the key problem in the implementation of the deradicalization programme is the problem of safety for all involved actors: programme participants, their families and employees of the rehabilitation center.
KISAH IBRAHIM MENCARI TUHAN DAN NILAI-NILAI PENDIDIKAN
Authors: Suyanta Sri
Published: February 2021

Dari segi pendidikan, pada kisah Ibrahim mencari Tuhan kita dapat menghubungkannya dengan tiga ranah yang lazim dikembangkan, yaitu aspek jasmani (ranah psikomotorik), aspek akal (ranah cognitif) dan aspek hati (ranah affektif). Dari pengembangan yang seimbang ketiga aspek inilah diharapkan terbentuk manusia sempurna (insan kamil) dan paripurna (syamil). Di antara nilai yang mampu ditangkap dari tema utama, Ibrahim mencari Tuhan dapat diklasifikasi kepada dua, yaitu secara vertikal dan secara horisontal, Secara vertikal kita mendapatkan adanya gerak transendensi manusia kepada Tuhan penciptanya. Hal ini tergambar jelas dalam perjalanan spiritual Ibrahim dalam mencari dan menemukan Allah sebaga Yang Maha Benar. Sedangkan secara horinsontal kita mendapati hikmah dalam sosialisasi kebenaran kepada sesama manusia. Hal ini juga jelas terlihat bagaimana etika dan strategi Nabi Ibrahim dalam menjalankan dakwahnya
Endocrine, sexual and reproductive functions in patients with Klinefelter Syndrome compared to non-obstructive azoospermic patients.
Authors: Kocamanoğlu Fatih , Ayas Bulent , Bolat Mustafa , Abur Ummet , Bolat Recep , Aşçı Ramazan
Published: February 2021

Aims: We aimed to investigate fertilization rates, quality of embryo,
pregnancy and live birth rates, endocrine, sexual function,
psychological status and quality of life of cases diagnosed with
Klinefelter syndrome (KS). Methods: Clinical findings, hormone values
and semen analyses in patients with nonmosaic KS (Group 1, n=121) and
those with non-genetic nonobstructive azoospermia (NOA) (Group 2, n=178)
were retrospectively analyzed. Sperm retrieval outcomes with
microdissection testicular sperm extraction (micro-TESE), fertilization
rates and embryo quality, pregnancy, abortion, and live birth rates were
compared. Sexual functions were assessed using IIEF-15, quality of life
was evaluated, and psychological status was assessed. Results: There was
no difference in terms of age between groups. Sperm retrieval rates was
38% and 55.6% in Group 1 and 2, respectively (p=0.012). Sperm
retrieval rates were higher in Group 1 before 31.5 years than in Group 2
(AUC=0.620, 0.578). Compared to Group 2, the fertilization rate was low
in Group 1, whereas embryo quality was similar. Live birth rates were
12.5% and 23% in Group 1 and 2, respectively (p=0.392). The education
level, libido, erectile functions, and general health satisfaction were
lower in Group 1 than in Group 2 (buraya p değeri yaz). Depression and
anxiety levels were higher in Group 2 than Group 1 (p değeri yaz).
Conclusion: Higher sperm retrieval rate has been achieved in group 1
younger than 31.5 years. Similar embryo quality is provided between
groups. Sexual dysfunction and psychiatric problems were higher in Group
1, with lower satisfaction and general health than Group 2. Patients
with KS should be monitored not only with their reproductive functions
but also with their general health status.
Clinical pharmacist-led educational tool effect on pediatric patients with epilepsy in Jordan
Authors: Jarad Suha , Akour Amal , Khreisat Wael , El-Shammari Afrah
Published: February 2021

Aim: To investigate the effect of a clinical pharmacist-led educational
tool on pediatric patients with epilepsy in Jordan. Specifically on the
efficacy, safety, adherence to antiepileptic drugs (AEDs), satisfaction
with information about AEDs provided to the caregivers, and quality of
life (QoL). Methods: This was a randomized controlled trial where
pediatric patients were randomly assigned to the intervention (n=41) or
the control (n=40) group. 30-minute clinical pharmacist-led educational
interview to the parent/caregiver was provided to the intervention group
as add-on to standard medical care received by the control group.
Efficacy was measured by number of seizure-free patients, while epilepsy
specific questionnaires were used to evaluate safety, adherence,
satisfaction with information about AEDs and QoL; measured at baseline
and after 8-week follow-up. Results: The intervention group had 63.9%
seizure free patients at follow up vs. 31.7% at baseline (P-value
<0.001), and the control group had 48.6% at follow up vs.
27.5% at baseline (P-value <0.05); with no significant
difference between groups (P- value > 0.05). At follow-up,
mean pediatric epilepsy side effects questionnaire (PESQ) score was
reduced in the intervention group (P-value <0.001), and
increased in the control group (P-value <0.001); with no
significant difference between groups (P-value=0.08). While the
intervention group had a significant higher mean score of adherence
(P-value <0.0001), and higher satisfaction with information
(P-value <0.0001), and a higher QoL (P-value <0.05).
There was a significant positive correlation between satisfaction and
adherence (r=0.682, P-value < 0.0001), satisfaction and QoL
(r=0.298, P-value < 0.05), adherence and QoL (r=0.323, P-value
< 0.01). While, satisfaction and safety, safety and QoL
correlated significantly and negatively (r=-0.263, P-value <
0.05 and r=-0.782, P-value < 0.0001, respectively) Conclusion:
Clinical pharmacist-led educational tool had a positive outcome on
pediatric patients with epilepsy with regard to efficacy, safety,
adherence, satisfaction with information about AEDs and QoL.
Endoscopic ultrasonography confirmed recurrence of gallbladder cancer: a case report (with a video).
Authors: Xu Lifen , Hu Duanmin
Published: February 2021

Biliary tract cancer is the most common biliary malignant tumor, which
is considered to be a high-grade malignant tumor because of its frequent
recurrence / metastasis[1]. Late recurrence of gallbladder cancer
after operation is rare. We presented a case of recurrent cancer after
radical resection of gallbladder cancer.
Disturbance and the (surprising?) role of ecosystem engineering in explaining spatial patterns of non-native plant establishment
Authors: Root-Bernstein Meredith , Muñoz Cesar , Armesto Juan
Published: February 2021

The Intermediate Disturbance Hypothesis is widely considered to be wrong
but is rarely tested against alternative hypotheses. It predicts that
soil disturbances and herbivory have identical impacts on species
richness via identical mechanisms (reduction in biomass and in
competition). An alternative hypothesis is that the specific traits of
disturbance agents (small mammals) and plants differentially affects
richness or abundance of different plant groups. We tested these
hypotheses on a degu (Octodon degus) colony in central Chile. We ask
whether native and non-native forbs respond differently to degu
bioturbation on runways vs. herbivory on grazing lawns. We ask whether
this can explain the increase in non-native plants on degu colonies. We
found that biopedturbation did not explain the locations of non-native
plants. We did not find direct evidence of grazing increasing non-native
herbs either, but a grazing effect appears to be mediated by grass,
which is the dominant cover. Further, we provide supplementary evidence
to support our interpretation that a key mechanism of non-native spread
is the formation of dry soil conditions on grazing lawns. Thus ecosystem
engineering (alteration of soil qualities) may be an outcome of
disturbances, which each interact with specific plant traits, to create
the observed pattern of non-native spread in the colony. Based on these
results we propose to extend Jentsch & White’s (2019) concept of
combined pulse/ disturbance events to the long-term process duality of
ecosystem engineering/ disturbance.
Trans-cervical carotid artery stenting associated with open surgical repair of carotid artery pseudoaneurysm
Authors: Mansoor Tayyaub , Elsherif mohamed , Fahey Brian , Kiernan Aoife , Neill Sean O
Published: February 2021

We report the case of an 81 year old lady presenting with a left
pulsatile neck mass 7 years after her initial carotid endarterectomy
(CEA). We were able to employ a combined hybrid trans-cervical carotid
stents followed by open excision and repair for a successful outcome
(0005) Practical possibilities of pumped-storage power plants implementation in liquidated underground mines.
Authors: Grzegorz Peczkis
Published: February 2021

In the paper the theoretical basis of pumped-storage power plant
operation is presented. Working conditions of hydraulic machines in
these kinds of objects are described and examples are given. The Czech
research results as well as German theoretical analyses on the topic of
water energy storage in underground mines are characterized. The
conditions for building pumped-storage power plant in Polish underground
coal mines, including liquidated ones, are determined. Analysis of
parallel operation of multistage centrifugal pumps, dedicated to the
mine drainage system, manufactured and operated commonly in Poland is
presented. The main dimensions calculations of two multistage
centrifugal pumps (power of 10 MW and 25 MW), dedicated for selected
parameters, are presented.
Characterizations of majorization on summable sequences
Authors: Raju Kosuru , Saha Subhajit
Published: February 2021

In this paper, we prove a necessary and sufficient condition for majorization
on the summable sequence space. For this we redefine the notion of
majorization on an infinite dimensional space and therein investigate
properties of the majorization. We also prove the infinite dimensional
Schur-Horn type and Hardy-Littlewood-P?lya type theorems.
Univalence criteria for general integral operators involving normalized Dini functions
Authors: Din Muhey , Raza Mohsan , Deniz Erhan
Published: February 2021

In this paper our aim is to deduce some sufficient conditions for integral
operators involving normalized Dini functions to be univalent in the open
unit disc. The key tools in our proofs are the generalized versions of the
well-known Ahlfor?s and Becker?s univalence criteria and some inequalities
for the normalized Dini functions.
Univalence criteria for a general integral operator
Authors: Bǎrbatu Camelia , Breaz Daniel
Published: February 2021

For some classes of analytic functions f and 1 in the open unit disk U, we
consider the general integral operatorMn, that was introduced in a recent
work [2] and we obtain new conditions of univalence for this integral
operator. The key tools in the proofs of our results are the Pascu?s and the
Pescar?s univalence criteria. Some corollaries of the main results are also
considered. Relevant connections of the results presented here with various
other known results are briefly indicated.
Characterizations of an MW-topological rough set structure
Authors: Han Sang-Eon
Published: February 2021

Regarding the study of digital topological rough set structures, the present
paper explores some mathematical and systemical structures of the
Marcus-Wyse (MW-, for brevity) topological rough set structures induced by
the locally finite covering approximation (LFC-, for brevity) space (R2,C)
(see Proposition 3.4 in this paper), where R2 is the 2-dimensional Euclidean
space. More precisely, given the LFC-space (R2,C), based on the set of
adhesions of points in R2 inducing certain LFC-rough concept approximations,
we systematically investigate various properties of the MW-topological rough
concept approximations (D -M, D+M) derived from this LFC-space (R2,C).
These approaches can facilitate the study of an estimation of roughness in
terms of an MW-topological rough set. In the present paper each of a
universe U and a target set X(? U) need not be finite and further, a
covering C is locally finite. In addition, when regarding both an M-rough
set and an MW-topological rough set in Sections 3, 4, and 5, the universe
U(? R2) is assumed to be the set R2 or a compact subset of R2 or a certain
set containing the union of all adhesions of x ? X (see Remark 3.6).
Geometry of warped product pointwise submanifolds of Sasakian manifolds
Authors: Alqahtani Lamia , Balkan Yavuz
Published: February 2021

Recently, Chen and Uddin introduced and studied warped product pointwise
bi-slant submanifolds of K?hler manifolds in [13]. They have obtained many
interesting results. In the present paper, we investigate warped product
pointwise bi-slant submanifolds in Sasakian manifolds and we derive contact
version of results obtain in [13]. We give a non-trivial example to prove
the existence of these submanifolds.
Rancang Bangun Sistem Pengukuran Tekanan Udara Menggunakan DT-Sense Barometric Pressure Berbasis Internet of Things dengan Display Smartphone
Authors:   Universitas Negeri Padang, Tri Handini Indah , Yulkifi Yulkifi ,   Universitas Negeri Padang, Darvina Yenni ,   Universitas Negeri Padang
Published: February 2021

Weather be a very important thing to observe. One of the weather paramaters is air pressure. The air pressure on a surface is the force given to a surface or area by the air column above the surface. This research designed an air pressure gauge using DT-Sense Barometric Pressure which used to measure the value of the air pressure based of Internet Of Things with measurement result displayed on a smartphone. For data retrieval techniques were done by directly and indirectly. The amount that carried out directly is air pressure, while the indirect amount is the precision and the accuracy of air pressure measurements. The result of this research was the system performance specifications consist of mechanical systems that were supported by electronic systems. The precision measurements were done by comparing the results from Digital Barometer with the air pressure gauge that has been made. The percentage of average erros that obtained was 0.02965%, the relative precision average on the system was 0.99955, and the precision percentage of the tool was very good at 99.995%. The accuracy measurements were done by measuring the air pressure under the same conditions. The measurements were done by 10 times with reading on a constant standard measuring tools. The average accuracy of the system was 0.99 with an average standard deviation of 0.7 and relative errors average 0.0098%.
Desain dan Modifikasi Sistem Elektrolit Air Laut Dengan Penambahan Bahan Alumina
Authors:   Universitas Lampung, Yuliansyah Muhammad Iqbal , Pauzi Gurum Ahmad ,   Universitas Lampung, Warsito Warsito ,   Universitas Lampung
Published: February 2021

Seawater-based electrolyte system has been realized with the addition of variations of Alumina. This study aims to determine alumina on the characteristics of the resulting voltage and current. The variation of alumina used is 2 grams and 4 grams. The testing process was carried out using 40 electrolyte cells with a pair of Zn in each cell. The test time was carried out for 48 hours with 2 electrolyte changes for each variation of alumina. The test results are relatively the same, namely the resulting voltage of 26.9 volts Cu-electrode and a current of 2.5 mA for each variation of alumina, so it is known that the given alumina does not give a significant change to the voltage and current results.
Pengaruh Perlakuan Termal Terhadap Karakteristik Aspal Komposit Berbasis Silika Sekam Padi
Authors:   Universitas Lampung, Susanti Nita , Simbolon Juniati Br ,   Universitas Lampung, Sembiring Simon ,   Universitas Lampung, Manurung Posman ,   Universitas Lampung
Published: February 2021

Synthesis and characterization of asphalt has been modified with silica rice husk with temperature variations of 200, 250, and 300oC. Silica is obtained from rice husk using the sol gel method. Furthermore asphalt and silica are solidified at 110oC. The experiment was conducted to determine the effect of temperature on the microstructure, structure, and functional groups of modified asphalt. SEM analysis shows asphalt modification with a temperature of 300oC in the form of different clumps. XRD analysis showed the phase formed from each temperature was an amorphous phase. The result of the FTIR analysis showed that the functional groups seen in the modified asphalt samples were Si-OH, Si-O-Si, Si-O, and C-H. The compressive strength carried out showed the strength of asphalt again cracks became stronger as the temperature increased.
Penerapan Fisika Komputasi dengan MATLAB/Simulink pada Pemodelan Infeksi Wabah COVID-19 di Indonesia melalui Modifikasi Persamaan Differensial Bernoulli
Authors:   Politeknik STTT Bandung, Putra Valentinus Galih Vidia , Wijayono Andrian ,   Politeknik STTT Bandung, Mohamad Juliany Ningsih ,   Undana, Irwan Irwan ,   Politeknik STTT Bandung, Rosyidan Cahaya
Published: February 2021

The application of physics, in particular, the topic of differential equations is commonly used in mathematics, physics, engineering, and various other sciences to explain a phenomenon in a system, to produce a form of simulation and prediction of a fairly good mathematical equation is needed. This paper examines the use of MATLAB / Simulink to assist in modeling the solution of the differential equation problems by providing a case of mathematical modeling in the analysis of the COVID-19 plague in Indonesia in 2020 with the modification of the Bernoulli equation. In this study, it can be concluded that MATLAB / Simulink can be used to solve differential equation problems with Bernoulli's modification in the case of COVID-19 plague modeling quite accurately.
Pengukuran Modulus Geser Baja Menggunakan Analisis Osilasi Pegas-Massa
Authors:   Universitas Sanata Dharma, Hia Samuel , Panuluh Albertus Hariwangsa ,   Universitas Sanata Dharma
Published: February 2021

A steel shear modulus measurement has been conducted using spring-mass oscillation analysis. The purpose of this study is to determine whether the spring-mass oscillation analysis method can measure the shear modulus of the steel. In this study, springs that are used are made of steel with a spring radius of 7.86 mm, a spring wire diameter of 0.817 mm and there is no distance between the coil springs. The length of the spring is varied 7 times, i.e., 4.75 cm, 5.36 cm, 5.89 cm, 6.81 cm, 8.53 cm, 9.44 cm, and 10.87 cm. The spring radius and the diameter of the spring wire are measured using a micrometer screw, while the spring length is determined using image analysis using the Logger Pro program. The spring constant is determined from the equation of the results of the position graph fitting (x) with respect to time (t) load on the oscillating spring-mass system. The value of the shear modulus can be determined from the constants on the graph of the relationship of the spring constant to the spring length following the equation from Sommerfeld. The research measures the shear modulus is 1.24 GPa
Analisis Perhitungan Gaya Berat pada Tongkat Gayung Lipat untuk Mengetahui Efektifitas Pengungkit Jenis Tiga
Authors:   Universitas Pendidikan Indonesia, Firmansyah Feri Hidayatullah , Nabila Tasha ,   Universitas Pendidikan Indonesia, Soffa Fauziah Masula ,   Universitas Pendidikan Indonesia, Fahmi Yusri El ,   Universitas Pendidikan Indonesia
Published: February 2021

Tongkat Gayung Lipat is a tool initiated by a PKM-KC team at the University of Education of Indonesia. The Tongkat Gayung Lipat is a tool that can help humans' outdoor activities. It has four main functions such as a mountain climbing tool, a container for taking water both far or near located, a flashlight in the stick handle serves as a lighting tool, and a knife in the stick handle serves cutting objects. Human needs when going on vacation and the limitations of the water dipper in tourist attractions are the reasons for making this tool. This tool was initiated to make it easier for people to do activities in the bathroom and do other activities outdoor (indoor and outdoor). Thus, to see the effectiveness of the tool, a trial was carried out by considering the load and human strength when lifting water. The calculation carried out using the third type of lever of physics laws approach which can provide a precise calculation of the effectiveness of objects. The analysis was carried out using the fourth lever type of physics law approach by calculated gravity, mass, and force. The result of the calculation was there is three comparisons of gravity. They are 23.6 N, 23.3 N, and 12.03 N. With these results, it is necessary to analyze the effectiveness of the Tongkat Gayung Lipat.
Sintesis Ferroelektrik BaZrxTi1-xO3 Dengan Variasi Zirkonium Terhadap Struktur Kristal dan Konstanta Dielektrik
Authors:   Universitas Nahdlatul Ulama Lampung, Subarwanti Yunita , Mariana Erni ,   Universitas Nahdlatul Ulama Lampung
Published: February 2021

This study aims to determine influence addition Zr against the crystal structure and dielectric constant; and to know the influence of variations temperature sintering on addition mole Zr. Barium Zirconium Titanate (BaZrxTi1-xO3) have been made with variation zirconium (Zr) 1%, 5%, 10%, and 20% by solid state reaction method, that is blanded BaTiO3, TiO2 and ZrO2 powder. BaZrxTi1-xO3 powder is printed with die pressing and press hidrolik, then the samples were sintered by furnace at 900oC and 1000oC with holding time 2 hours. Characterization of samples use X-Ray Diffraction and Resistance Capacitance Inductance (RCL meter). Based on result obtained, the larger Zr content cause dielectric constant decreasing because crystal structure have been change from tetragonal (Zr = 1% and 5%) to cubic (Zr = 10% and 20%). The result from X-Ray Diffraction already match with data base ICDD no#360019. Measurement of dielectric constant (K) performed in the frequency range 1 kHz to 100 kHz and the highest value at Zr content 1%, because The dielectric constant decreasing with the larger Zr content. The maximum dielectric constant is obtained at mol Zr 5% and sintering temperature 1000oC, that is 150. The minimum dielectric constant is obtained at mol Zr 20% and sintering temperature 900oC, that is 62.
Pengaruh Kecepatan Potong dan Makan terhadap Umur Pahat pada Pemesinan Freis Paduan Magnesium
Authors: Ansyori Anang
Published: February 2021

Mesin frais adalah mesin yang digunakan secara akurat untuk menghasilkan satu atau lebih pengerjaan permukaan benda dengan menggunakan satu atau lebih alat potong. Benda kerja dipegang dengan aman pada meja benda kerja dari mesin atau dalam sebuah alat pemegang khusus yang dijepit atau dipasang pada meja mesin. Selanjutnya benda kerja dikontakkan dengan pemotong yang bergerak maju mundur. Mesin frais merupakan mesin potong yang dapat digunakan untuk berbagai macam operasi seperti pengoperasian benda datar dan permukaan yang memiliki bentuk yang tidak beraturan, roda gigi dan kepala baut, boring, reaming. Kemampuan untuk melakukan berbagai macam pekerjaan membuat mesin frais merupakan salah satu mesin yang sangat penting dalam bengkel kerja.Pada Penelitian ini proses pengefraisan magnesium dilakukan pada beberapa tingkat level parameter yaitu kecepatan potong dengan variasi (v) 22,60 m/min, 32,15 m/min, 42,70 m/min, gerak makan 0,15 mm/rev, 0,20 mm/rev, 0,25 mm/rev, dan kedalaman potong 2 mm. Pengambilan data keausan pahat dilakukan menggunakan pocket mikroskop VB dan microscope 2  dengan pembesaran 50x. Data keausan pahat dicatat setiap kali pemotongan dan pemesinan akan dihentikan apabila aus mata pahat (VB) telah mencapai 0,3 mm. Umur pahat tertinggi diperoleh  pada kecepatan potong 22,85 m/min dengan gerak makan 0,15 mm/rev yaitu selama 88 menit, sedangkan umur pahat terendah pada kecepatan potong 42,70 m/min dengan gerak makan 0,25 mm/rev yaitu selama 18 menit. Semakin besar kecepatan potong (Vc) maka semakin cepat laju keausan pahat frais  yang terjadi, yang disebabkan oleh suhu tinggi sebagai hasil dari gesekan antara pahat dan benda kerja.Kata kunci : Mesin frais, Umur Pahat, Kecepatan Potong dan Gerak makan
Pengujian Orifice Flow Meter dengan Kapasitas Aliran Rendah
Authors: Ghurri Ainul , Tisna S.P.G. Gunawan , Syamsudin Syamsudin
Published: February 2021

Orifice flow meter is used in many laboratory and industrial application due because of its simple design and low cost. The present research investigated an orifice flow meter operated in relatively low flow rate. Orifice plate is a metal plate, 10 mm width provided with bevel at inlet section. The diameter ratios (β) are 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8, respectively. The experiment used water with flowrate range having Reynolds number between 6827,55 and 8004,72. The fluid is flown through the orifice plate. Pressure taps are used to measure pressure at upstream and downstream of the orifice plate. The actual capacity is directly measured at an outlet reservoir; while the theoretical capacity is calculated using modified Bernoulli equation with diameter ratio (β) within the equation. The results showed that the irrecoverable pressure drop decreased with the increase of flow capacity and the diameter ratio. The discharge coefficient of the orifice flowmeter ranged between 0.3 and 1.3.
Construction of the basement of cottages in water-saturated soils using vibration technology
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Latuta V. V. , Zhivotov D. A. ,   Saint Petersburg State University of Architecture and Civil Engineering, Velichkin V. Z. ,   Peter the Great St. Petersburg Polytechnic University, Vorona-Slivinskaya L. G. ,   Saint Petersburg State University of Architecture and Civil Engineering
Published: February 2021

he paper discusses the directions of technology development using a vibration method that allows arranging basements in low-rise buildings with external waterproofing. A new technology is offered allowing arranging external waterproofing using special cement-based waterproofing compounds. To optimize the timing of construction process, the authors propose developing the ground excavation with a vibrating grab. Technological operations and design solutions for the sequence of works have been developed.
Structural equation model of quality control in construction production of Vietnam
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Yudina A. F. , Nguyen Thai Hiep ,   Saint Petersburg State University of Architecture and Civil Engineering
Published: February 2021

This article presents the results of the analysis of factors affecting quality control in the construction industry of Vietnam on the basis of the method of confirmation factor analysis (CFA) and structural equation model (SEM). The results show that 25 factors, 6 goals, which are located in 5 criteria, are the most important for quality control in the construction industry of Vietnam. However, to be able to more fully reflect the results of the analysis, according to the data obtained from the survey, it is necessary to add 17 relationships. The results of the analysis also show that the model achieves convergence, discriminatory value and high reliability, but without unidirectionality.
The change in impermeability of steel fiber reinforced concrete with high strength cement-sand matrix at heating
Authors:   JSC «Institute «Orgenergostroy», Dorf V. A. , Krasnovskij R. O. ,   JSC «Institute «Orgenergostroy», Kapustin D. E. ,   JSC «Institute «Orgenergostroy», Sultygova P. S. ,   Ingush State University, Travkin P. V. ,   JSC «Institute «Orgenergostroy»
Published: February 2021

The paper considers the effects of high temperatures in case of fire on the change in impermeability of steel fiber reinforced concrete having a high-strength cement-sand matrix and various content of fiber of different types, sizes, and strength. It is shown that in the temperature range from 20° to 1100° C in the diagram “Heating temperature - impermeability class», the matrix and steel fiber concrete(SFC) have a S-shaped character, and in case of heating temperature of over 100 °C, there comes a distinct decrease in impermeability.
Increasing of the fuel cost-effectiveness of commercial vehicles using a diesel electric powertrain
Authors:   Ural Federal University named after the first President of Russia B. N. Yeltsin, Meltsin E. S. , Markina A. A. ,   Ural Federal University named after the first President of Russia B. N. Yeltsin, Ilin A. V. ,   Ural Federal University named after the first President of Russia B. N. Yeltsin
Published: February 2021

The issue of increasing the fuel cost effectiveness of passenger commercial vehicles is one of the most important, since the annual increase in the fuel cost leads to an increase in the fixed costs of not only transport companies, but also of small- and medium-sized businesses. Using a hybrid power train (HPT) can reduce fuel consumption in the urban cycle, which is important for commercial vehicles used to deliver goods and passengers within the city limits, especially when megacities are involved, where traffic is heavy and average speeds are not high. The cost of cars with a hybrid power train, such as Toyota Prius, Lexus RX 450h, Ford Fusion Hybrid and others, remains quite high and does not allow to pay back the car only due to fuel economy. On the other hand, the configuration of these vehicles does not allow them to be used as a commercial vehicle for transporting small loads and passengers, Therefore, it is proposed to consider the option of converting a car with a gasoline engine and calculate the possible fuel economy.
Numerical modelingof a composite section element from thin-walled profiles taking into account the initial geometric imperfections
Authors:   Industrial University of Tyumen, Prostakishina D. A. , Korsun N. D. ,   Tyumen Industrial University
Published: February 2021

The article describes the process of numerical simulation of a composite symmetric section element made of thin-walled Sigma profiles operating under conditions of longitudinal compressive force with bending, taking into account the initial geometric imperfections. At numerical modeling, the main criterion of the load-bearing capacity exhaustion in case of eccentric compression is the stability loss in one of the forms. However, for thin-walled elements, the loss of local stability does not mean that the load-bearing capacity is completely exhausted, since the element continues to carry the load, but to a lesser extent. Therefore, simulation was carried out in two stages: initially, in the elastic formulation, the possible buckling modes were determined, afterwards, there was made calculation on the deformed pattern taking into account possible imperfections.
Endüstriyel Hava Kirliliği Toprak Mikro Eklembacaklılarının (Arthropoda) Miktar ve Çeşitliliğini Etkiler Mi?
Authors: DUYAR Ahmet
Published: February 2021

Endüstriyel tesislerden çevreye yayılan kirletici atıklar hava, su ve toprak gibi ortamları etkileyerek, ekolojik yapıyı bozabilmektedir. Toprak ekosisteminde önemli rol oynayan toprak mikro eklembacaklıları çevresel değişimlere karşı çok hassas canlılardır. Çimento fabrikaları ve demir çelik tesisleri çevreye yoğun atmosferik kirleticiler bırakmaktadır. Bu çalışmada, Karabük ilindeki çimento ve demir-çelik fabrikasının etraflarındaki toprak mikro eklembacaklılarına olası etkileri araştırılmıştır. Bu amaçla, bahar ve güz mevsimlerinde fabrikaların doğusundaki sırtın fabrikalara bakan ve Karabük Üniversitesi’ne bakan yönlerinde taban, orta yamaç ve üst yamaç olmak üzere 6 noktada üçer tekerrürlü örnekleme yapılmıştır. Toprak örnekleri 5 cm boy ve 5 cm çaplı silindir ile üst topraktan (0-5 cm) alınmıştır. Eklembacaklılar, örneklerden Berlese hunisi yöntemi ile çıkartılmış, mikroskop altında teşhis edilip, sayılmış ve sınıflandırılmıştır. Yapılan çalışmanın sonuçlarına göre, çalışma alanında 61 farklı eklembacaklı taksonu saptanmıştır. Her iki yamaçta da akarlar ve collembolalar en fazla bulunan taksonomik gruplardır. Eklembacaklı sayısı ve Shannon çeşitlilik indeksi (H′) açısından yamaçlar arasında önemli fark bulunmuştur. Kirlilik etkisi altındaki fabrikaya bakan yamaçta 15463 birey∙m⁻² ve H′=1,9 iken, üniversiteye bakan yamaçta ise 47020 birey∙m⁻² ve H′=2,5 olarak bulunmuştur. Fabrikaya bakan yamaçta eklembacaklı miktarının daha az olması ve biyolojik çeşitlilik indeks değerinin de daha düşük bulunması; endüstriyel kirleticiye doğrudan maruz kalmasının, toprakta yaşayan eklembacaklı taksonlarına belirgin olarak zarar verdiğini düşündürmektedir.
Göksu Nehri Havzasının Yağış-Akış İlişkileri
Authors: PALTA Şahin , YURTSEVEN İbrahim , AKSAY Halit
Published: February 2021

Araştırmaya konu
edilen Göksu havzasındaki iki adet akım gözlem istasyonu ve bir adet
meteoroloji istasyonundan 2005-2014 yılları arasındaki akış ve yağış
verilerinin her bir aya ait uzun dönemli ve mevsimlik verilerinde bir trendin
var olup olmadığı Mann-Kendall Mertebe Korelasyonu testi ile analiz edilmiştir.
Trend analizine geçmeden önce E17A020 (Hamam) ve E17A014 (Karahacılı) kod
numaralı iki akım gözlem istasyonuna ait havza büyüklükleri ile debi değerleri
dikkate alınarak bu iki istasyona ait su verimleri belirlenmiştir. Su verimleri
ile toplam yağışın oranı olarak değerlendirilen akış katsayıları yüzdeleri her
istasyon için ayrı ayrı hesaplanmıştır. Havzalardaki su veriminde meydana gelen
kayıpların bir göstergesi konumunda bulunan akış katsayısı parametresi
yükseldikçe havzadaki toplam su kaybının az olduğu, düştükçe su kaybının
fazlalaştığı ya da suyun toprakta depo halinde bulunduğu ya da doğal akışın
baraj vb. yapay etkenlerle sınırlandığı sonucuna varılabilmektedir. Yıllık
toplam akış ve yağış değerleri göz önüne alındığında E17A020 nolu havzanın akış
katsayısı %43.49, E17A014 kod numaralı akım gözlem istasyonu için ise %41.28
olarak hesaplanmıştır. Havzadaki yağış-akış ilişkisini tespit etmek için her 12
ay ayrı ayrı değerlendirilerek yapılan trend analizinde E17A020 istasyonunda
tüm aylarda trendin var olmadığı, E17A014 istasyonunda ise Temmuz ve Eylül
akışlarında bir artış olduğu görülmektedir. Diğer aylarda ise bu istasyon için
herhangi bir eğilim bulunamamıştır. Her iki istasyonda da dört mevsim ayrı ayrı
değerlendirildiğinde uzun dönemli zaman serilerinde sadece E17A014 istasyonuna
ait yaz mevsimi yağışlarında artış görüldüğü diğer mevsimlerde ise herhangi bir
artış veya azalış trendi bulunmadığı görülmektedir. Yağış trendinde ay ve
mevsimde hiç bir trendin varlığının görülmemesi son yıllarda yaz aylarındaki
akarsu akışlarında yapay baraj ve bend gibi depolama alanlarından suyun
beslemesinin arttığı çıkarımı elde edilmiştir.
Cydalima perspectalis (Walker) (Lepidoptera: Crambidae, Spilomelinae)’in Türkiye’de Coğrafi Yayılışı, Yaşam Döngüsü Ve Zararı
Authors: TOPER KAYGIN Azize , TAŞDELER Cansın
Published: February 2021

Cydalima perspectalis (Walker), Lepidoptera takımına bağlı Crambidae
familyasından bir tür olup şimşir üzerinde primer zararlıdır. Zararı tırtıllar
yapmaktadır. Yaprakları yiyerek bitkinin fotosentez yapmasını engellemekte,
sürgünlerin kabuklarını kemirmekte, kambiyum tabakasına zarar vermekte ve
böylece şimşir sürgünlerini, dallarını kurutabilmektedirler. Ülkemiz için egzotik
bir tür olan şimşir güvesi ilk kez 2011 yılında İstanbul’da Sarıyer’deki park
ve bahçelerde; 2015 yılında Düzce’de ve Artvin’de, 2016 yılında ise Bartın’da
varlığı tespit edilmiştir. Bu yıldan itibaren Batı Karadeniz Bölgesindeki
yayılışı hızla devam etmiştir. Böceğin yaşam döngüsü, yayılış alanları ve bu
alanlarda şimşir türlerinin durumunu tespit etmek amacıyla bu araştırma
yapılmıştır. Bu istilacı
böceğin Şimşir türünün bulunduğu tüm Karadeniz ve Marmara Bölgelerinde şiddetli
zarar yaptığı, şimşir alanlarının önemli bir kısmını kuruttuğu görülmüştür.
Ayrıca İç Anadolu Bölgesine geçerek 2017-2018 yıllarında Ankara, Niğde ve
Kırşehir’de peyzaj alanlarında ve parklardaki şimşirlerde zarar yaparak
yayılışını sürdürmüştür. Bu araştırma ile C.
perspectalis’in biyolojik
dönemleri takip edilerek yılda üç
generasyon verdiği ilk kez tespit edilmiştir. Ayrıca larvalarının kanibalizm
davranışı göstererek pupaları yediği ilk kez bu araştırma ile kayıt altına
alınmıştır. Böceğin Türkiye’nin güney bölgelerdeki şimşir alanlarına ulaşması
durumunda uygun ekolojik koşullara binaen yıl içindeki generasyon sayısının
artacağı ihtimali dikkate alınmalıdır.
Zonguldak Orman Bölge Müdürlüğü Çalışanlarının İş Doyumunu Etkileyen Faktörler
Authors: DAŞDEMİR İsmet , AĞDAŞ OKUL Ayşegül
Published: February 2021

Bu çalışma, Zonguldak
Orman Bölge Müdürlüğü ve bağlı birimlerinde çalışanların iş doyumunu etkileyen
faktörleri belirlemek, iş doyumunun bazı kişisel özelliklere (çalışılan birim,
görev, eğitim, yaş, cinsiyet, medeni hal vb.) göre farklılığını denetlemek ve
böylece çalışanların iş doyumun artırılmasına katkı yapmak amacıyla ele
alınmıştır. Araştırma verileri üç bölümden (Kişisel Özellikler Bölümü – 12
soru, İş Doyum Bölümü – 43 soru, Öneriler ve Yorumlar Bölümü) oluşan bir anket formu
yardımıyla elde edilmiştir. Anket formları 2018 yılında Zonguldak Orman Bölge
Müdürlüğü ve bağlı birimlerinde çeşitli görevlerde çalışan 348 personel
üzerinde, tam alanda, e-maille, yüz yüze görüşme yöntemiyle ve çalıştıkları
işletme müdürlüklerine elden teslim edilerek uygulanmıştır. Elde edilen veriler
betimleyici istatistikler, Faktör Analizi ve Kruskal-Wallis H-Testi ile
değerlendirilmiştir. Değerlendirme sonucunda, çalışanların iş doyumunu
etkileyen en önemli faktörler; (1) Kararlara katılım ve saygınlık, (2) İşle
bütünleşme, (3) Liyakate dayalı örgüt kültürü, (4) Örgütsel iletişim
(bildirişme), (5) Vicdanen rahatlık, (6) Çalışma koşulları, (7) Ödül-takdir ve
terfi olanağı olarak saptanmıştır. Ayrıca çalışanların orta düzeyde iş doyumuna
sahip oldukları ve toplam iş doyumunun görev yapılan birime, medeni hale, eşin
çalışma durumuna ve vekalet göreve göre istatistiksel olarak anlamlı fark
gösterdiği, buna karşılık göreve, eğitime, yaşa, cinsiyete, doğum yerine,
toplam hizmet süresine, görevde geçen süreye ve görev yeri sayısına göre
anlamlı bir fark göstermediği belirlenmiştir. Çalışma sonunda, Zonguldak Orman
Bölge Müdürlüğü ve bağlı birimlerinde çalışanların iş doyumunun, veriminin ve başarısının
artırılmasına yönelik birtakım değerlendirmeler ve öneriler yapılmıştır.
Cumhuriyet Dönemi Türk Tiyatrosunda Doğa ve Ormana İlişkin Yaklaşımların İrdelenmesi
Authors: KAHRAMAN Buğra , YURDAKUL EROL Seçil
Published: February 2021

Kişilerin ve toplumların gelişiminde etkili bir rol oynama potansiyeline sahip olan tiyatro bir bilinçlendirme ve eğitim aracı olarak değerlendirilebilmektedir. Bu çerçevede çalışmada, Türkiye’de Cumhuriyetin ilanından günümüze, İstanbul Şehir Tiyatrolarında repertuvara alınmış ve sahnelenmiş olan yerli ve yetişkinlere yönelik tiyatro eserlerinde, doğa ve ormanla ilgili unsurlar içerik analizi yöntemiyle değerlendirilmiştir. Araştırma sonucunda, ana ve yan teması doğa ve orman olan eserlerin yok denecek kadar az olduğu, örneklem kapsamına giren tiyatro eserlerinde de doğa ve ormana ilişkin içeriklerin çok sınırlı düzeyde kaldığı belirlenmiştir. İncelenen eserlerde doğa ve ormanla ilgili içeriklerin, çoğunlukla ağaç, su, nehir, kuş, geyik, yaprak gibi ormanı oluşturan ve çağrıştıran unsurlar kategorisinde olduğu görülmüştür. Ormancılıkla ilgili etkinlikler ve ormanların işlevleri içerik olarak çok daha az bulunmaktadır. Ulaşılan bulgular ışığında doğa ve ormanla ilgili olarak toplumda farkındalık oluşturabilecek eserlerin yazılması ve sahnelenmesinin teşvik edilmesi, çok disiplinli bir yaklaşımın ilgili eğitim süreçlerinde benimsenmesi, kurumsal işbirliklerinin geliştirilmesi kapsamında bazı yaklaşımlar ortaya konulmuştur.
Kalkınma Planlarında Yer Alan Orman Köylüsüne İlişkin Politikaların Zamansal Değişimi
Authors: GÜNŞEN Hikmet Batuhan , ATMIŞ Erdoğan
Published: February 2021

Türkiye’de toplumun farklı kesimleri arasındaki gelir dağılımı eşitsizliği uzun zamandan beri varlığını sürdürmektedir. Orman köylerinin sahip olduğu zor yaşam şartları, orman köylüsünün ülke genelinde en düşük gelire sahip kesimi olmasına da neden olmuştur. Bu nedenle zaman içinde orman köylüsünü kalkındırma iddiasını taşıyan çeşitli politikalar oluşturulmuştur. Bu politikaların önemli bir kısmını ülke kalkınma planlarında görmek mümkündür. Bu çalışma; orman köylüsüyle ilgili politikalara ülke kalkınma planlarında ne derecede yer verildiğini ortaya koymak ve ilk kalkınma planından günümüze kadar geçen sürede kalkınma planlarında yer alan orman köylüleriyle ilgili politikaların zamana göre değişimini analiz etmek amacıyla yapılmıştır. Bunun için içerik analizinden yararlanılmış, orman köylüsüyle ilgili belirlenmiş sözcük ve kavramların kalkınma planlarında ne kadar sıklıkla kullanıldığı ve orman köylüsünün kalkındırılmasıyla ilgili hangi politikaların oluşturulduğu belirlenerek bunların gerçekleştirilip gerçekleştirilmedikleri sorgulanmıştır. Sonuç olarak; orman köylüsünün kalkındırılması için kooperatifleşme, kredi ve fonlar, yasal haklar gibi araçlar kullanılmasına karşın başarılı olunamadığı görülmüştür. Bu başarısızlıktaki en büyük etmen ise; gittikçe liberalleşen ülke politikalarının ormanlar ve orman köylüsünü koruma ile kalkındırma konularındaki zamanla artan ilgisizliğidir.
Farklı Yaşlardaki Tüplü Fıstıkçamı (Pinus pinea L.) Fidanlarının Morfolojik Kalite Özellikleri
Authors: AYAN Sezgin , CİVEK Emre , YER ÇELİK Esra Nurten , GÜLSEVEN Orhan , ÖZEL Halil Barış , ESHAIBI Jeuma Ahmed Hamed , AKIN Şeyma Selin , YILMAZ Ergin
Published: February 2021

Samsun-Gelemen Orman Fidanlığında yürütülen çalışmada, Samsun orijinli farklı yaşlardaki tüplü fıstıkçamı (Pinus pinea L.) fidanlarının morfolojik kalite özelliklerinin belirlenmesi amaçlanmıştır. Bu amaçla fidanların morfolojik özelliklerini belirlemede; Kök boğazı çapı (KBÇ), fidan boyu (FB), terminal sürgün boyu (TSB), kök taze ağırlığı (KTA), gövde taze ağırlığı (GTA), kök kuru ağırlığı (KKA), gövde kuru ağırlığı (GKA), fidan kuru ağırlığı (FKA), gürbüzlük indisi (Gİ), kuru kök yüzdesi (%KKök), katlılık indisi (Kİ) ve Dickson kalite indeksi (DKİ) kriterleri baz alınmıştır. Tespit edilen morfolojik özelliklere göre fidanlar, Türk Standartları Enstitüsü (TSE) kriterleri ve Aphalo ve Rikala (2003) Gİ değerine göre değerlendirilmiştir. Yetiştirilen 2+0 ve 3+0 yaşlı polietilen tüplü fidanların morfolojik kalite özellikleri ortalamaları sırasıyla; KBÇ: 7,92-11,8 mm; FB: 39,06-65,3 cm; TSB: 15,93-31,77 cm; KTA: 6,59-14,26 gr; GTA: 31,99-85,42 gr; KKA: 2,54-6,18 gr; GKA: 12,09-33,84 gr; FKA:14,63-40,02 gr; Gİ: 49,01-56,44; %KKök: 17-16; Kİ:4,99-5,61; DKİ:1,5-3,65 olarak belirlenmiştir. Kİ kriteri açısından 2+0 yaşlı fidanların %76,7’si, 3+0 yaşlı fidanların ise %90’ı “Iskarta” vasfındadır. Mevcut morfolojik standarttaki fidanların sadece peyzaj amaçlı ağaçlandırma çalışmalarında kullanılabileceği düşünülmektedir.