bluuebunny/crossref_metadata_2025 huggingface dataset:
تحسين قابلية الخرسانة على العزل الحراري في درجات الحرارة العالية بأضافة مواد نانوية
Authors: الرفاعي د. وائل نور الدين , عبد د. فياض محمد , الجبوري محمد سليمان محمد
Published: May 2021

يتضمن هذا البحث دراسة عملية لمدى تأثير اضافة مواد نانوية (غبار السيليكا النانوي والميتاكاؤولين النانوي) على قابلية الخرسانة للعزل الحراري في درجات الحرارة العالية مع تحسين الخواص الميكانيكية للخرسانة بأضافة تلك المواد النانوية، اي الحصول على خرسانة ذات قابلية جيدة في العزل الحراري مع خواص ميكانيكية جيدة وهو نوع جيد من الخرسانة يختلف عن الخرسانة الخفيفة الوزن او الخرسانة التقليدية وبذلك يمكن الاستفادة من التحسينات التي تحدثها المواد النانوية على الخرسانة والمونة السمنتية من ناحية العزل الحراري في المنشأت الحرارية والافران والمراجل من اجل الحصول على مواد عازلة جيدة ويمكن للقطاع النفطي والصناعي الاستفادة منها.

تم في هذا البحث اضافة المواد النانوية الى الخرسانة بنسب وزنية مختلفة من وزن السمنتكما تم استخدام ملدن فائق لغرض المحافظة على قابلية تشغيل جيدة مع عدم تغيير المحتوى المائي للخلطات الخرسانية مع اضافة نسبة من الياف الكاربون المقطع، تم اجراء فحص مقاومة الانضغاط ومعاير الكسر للمكعبات ومواشير الخرسانة النانوية قبل وبعد تعرضها لدرجات حرارة مختلفة تراوحت بين (25-750 درجة مئوية) ولمدة ساعتين لبيان تأثير درجات الحرارة العالية على الخواص الميكانيكية للخرسانة النانوية.

كما تم ايجاد معامل التوصيل الحراري للخرسانة النانوية المسلحة بمشبك الياف الزجاج (مشبك تسليح) حيث اظهرت النتائج بصورة عامة تحسن كبير في قابلية الخرسانة على العزل الحراري.
Theoretical Performance Study of an Indirect- Expansion Solar Assisted Heat Pump
Authors: Jassim Asst. Prof. Dr. Najim Abid , Al-Chlaihawi Kadhim Kareem
Published: May 2021

This work presents a theoretical performance study of an indirect- expansion solar assisted heat pump SAHP. The theoretical analysis included a simulation of the IX-SAHP using TRNSYS software. These tests were conducted by varying the controlling parameters to investigate their effects on the thermal performance of the IX-SAHP such as the evaporating and condensing temperatures, compressor speed, refrigerant type and the solar collector area. A significant effect of the compressor speed on the thermal performance of the system is indicated. An increase of compressor speed causes a decrease of coefficient of performance COP. The performance of refrigeration system largely depends upon the characteristics of the refrigerants. COP was affected by the solar collector area and type where the COP increases with increasing collector area, but for a given heating load there is a required minimum solar collector‘s area, also evacuated tube solar collector lead to higher COP than flat plate collector for a given collector area. Compared to the conventional heat pump system, the present indirect expansion solar assisted heat pump system has the advantage that the collector can absorb the radiation and ambient energy and lead to increase the superheat level at the compressor inlet, so that reduced the work input of compressor in comparison to the conventional heat pump system.
Iraq Crude Oil Exports – November, December 2016 and January 2017
Authors: Somo Ministry of Oil / Oil Marketing Company
Published: May 2021

Table 1. Iraq Crude Oil Exports – November 2016Table 2. Iraq Crude Oil Exports – December 2016Table 3. Iraq Crude Oil Exports – January 2017
Implement cleaner production system to ensure clean oil environment (Field study in Basrah Oil Company / Al-Burgesia Operations association)
Authors: Shibelee Dr. Moslim A. Shibelee , Naser Dr. Abad Alreda Naser
Published: May 2021

The research aims to detect the possibility of implementing the Cleaner Production Systemin the Iraqi Oil Company. Basra Petroleum Company was chosen as a field of study. The checklist was distributed to Intended sample of the operation and environment engineers in theAlBargesia Operations association. The research reached a number of results. The weakness ofthe technical and administrative staff in the company to understand the concepts and practicesof cleaner production and clean techniques and how to use them
An investigation of the optimum separation conditions in the Degassing stations of one of southern Iraqi oil Field
Authors: AL-Maliki Madhi A. R. Swadi
Published: May 2021

In field separation facilities operation, operators tend to determine the optimum conditions to maximize revenue.

The object of this study is to investigate the present number of separation stages and their optimal conditions for degassing stations of oil Field.  

A computer program model was written to predict the optimal conditions for oil field gas-oil separation stations subject to a given crude oil composition , flow rate and feed temperature and pressure using flash calculations with modified Soave-Redlich-Kwong Equation of state.

Nine Bottom-hole well samples of reservoir crude oil was collected and subjected to PVT analysis commonly performed on crude oil, Surface stage separators gas samples at steady condition were taken and analyzed by gas chromatography apparatus to determine the gas composition.

A good agreement was found by comparing theoretical and experimental prediction for gas composition.

    The results indicate that the present five separation stages is the optimum number and the values obtained for these optimum stages pressure are (514.7,119.7,42.7,26.7,14.7 psig) for Summer and (464.7,119.7,42.7,26.7,14.7 Psig) for Winter where the current operation pressures are  (614.7,119.7,42.7,26.7,14.7 psi) for Summer and Winter. The total liquid yields in stock tank reaches (1.29, 1.31 %) for summer and winter respectively and the stock tank API Gravity reaches (0.41, 0.42) for summer and winter respectively.
Treatment of Wastewater Associated With Crude Oil in Reservoirs
Authors: Mohammed Dr. Thamer J. , Jasim Jasim M.
Published: May 2021

The produced water or wastewater resulting from the oil reservoirs in Basrah Petroleum Company / Zubair 1 Warehouse causes very high pollution in the land. The aim of this study is to find possible ways to treat such produced water and to remove turbidity through coagulation, flocculation, sedimentation and adsorption. Experimental tests of the properties for natural produced water such as turbidity, pH, TDS, TSS, and oil content found out that oil content = 137 mg/L and turbidity = 122 NTU. The produced water is treated with two types of coagulant poly aluminum chloride, alum and with two other types of adsorbent (Bentonite , Zeolite (Cation and Anion)). The coagulation, flocculation and sedimentation experiments are performed using a Jar-test device and adsorption experiments , and a magnetic stirrer device are used at different times, speeds, and concentrations.

    It is found through the practical results that the best dosages of (poly aluminum chloride and alum) are (3, 35, 6.75, and 30) mg/L to obtain R% (96.3, 93, 99, and 98.9), respectively.

    It is found from the experimental results of adsorption that the best results of weight adsorbent, stirrer time and stirrer speed to obtain maximum removal efficiency are (6 gram anion zeolite ,15 minute and 920 rpm) R% (98 , 97.8 and 99.2), respectively .

It is found that the best results are poor at different parameters, except when it is used (2) gram of bentonite obtained R% of turbidity weight, stirrer time and stirrer speed by bentonite and zeolite (cation and anion) were (2 gram) . Finally, it was found that removing the oil content by adsorption (97.8) is better than coagulation (96.3). And the results for removing turbidity by coagulation (99) is better than adsorption (97.4)
استخدام تقنية تحليل المركبات الأساسية (PCA) لتحديد التراكيب المنخفضة الارتفاع / شمالي غرب العراق
Authors: حميد Dr. basman , حمدون Dr. alaa
Published: May 2021

ان الغاية الاساسية في هذه الدراسة هو ابراز وتثمين استخدام احد تقنيات التحسس النائي (وهي طريقة تحليل المركبات الاساسية PCA) في تشخيص وتحديد الاشكال الارضية الموجبة وخصوصا التراكيب المحدبة ذات الارتفاع الطوبوغرافي المنخفض في منطقة الدراسة والمحصورة بين غرب بحيرة سد الموصل وناحية العوينات شمال غرب مدينة الموصل.

أظهرت نتائج البحث ان استخدام طريقة (PCA)في المعالجة الرقمية للمرئيات الفضائية يعمل على تركيز معظم المعلومات التي تحتويها الحزم الطيفية الستة (للمرئية الفضائية الملتقطة بالقمر الصناعي لاندسات 5 المأخوذة بتاريخ 2009 والمستخدمة في هذه الدراسة) في المركبة الأساسية الأولى حيث كانت نسبة التباين في هذه المركبة اكثر من 90% من التباين الكلي أي ان هذه المركبة استحوذت على معظم المعلومات حول المعالم الأرضية في منطقة الدراسة في حين توزعت المعلومات القليلة المتبقية على المركبات الخمسة الباقية حيث بلغت نسبة التباين في المركبة الثانية حوالي 2% والثالثة حوالي 1% اما باقي المركبات الثلاث فنسبة التباين فيهم اقل من 1% اي اقل قدر من المعلومات.

كنتيجة نهائية لهذه الدراسة، فقد تم إعداد مرئيات ملونة كاذبة من المركبات الأساسية الناتجة وهذه المرئيات الناتجة ساعدت في تشخيص وتحديد بعض الأشكال الأرضية موجبة التي يصعب تمييزها بصريا ومن المرجح ان تكون تراكيب جيولوجية محدبة ذات محتوى هايدركاربوني. من هذه الاشكال الارضية التي تم تحديدها هما تركيبين محدبين قرب ناحية العوينات بامتداد شرق-غرب وهما ذو ارتفاع طوبوغرافي منخفض، بالاضافة الى تركيب محدب اخر يقع الى جنوب تركيب بطمة المحدب و ذو امتداد شرق-غرب.
Estimation of H2S Produced from Reservoir Souring
Authors: Mahdi Najwa H. , Al-Jawad Mohammed S.
Published: May 2021

The increase of the produce H2S due to water injection is known as reservoir souring. The sulfate reduced bacteria (SRB) which may be exist in the injected water reduces the sulfate which already existing in the reservoir. This study includes prediction of H2S for Mauddud reservoir in the Ahdeb oilfield by using specialized reservoir numerical simulator. Reservoir souring modeling utilized to enable operations to make better decisions for remedial actions to either prevent souring or to mitigate its impact. The aim of this study is to estimate the probability and timing of the start of H2S production in produced fluids. The results showed that the maximum concentration of H2S in the prediction production well was reached to 2.9 Ibm/day which occurs after 180 days this carry out when the SRB concentration was about 2000 ppm .The SRB concentration is increasing in areas where the sulfate is in high concentration and also there is a direct relationship between the SRB concentration and the H2S concentration
Nhiễm Candida da và niêm mạc mạn tính
Authors: Nguyễn Minh Tuấn
Published: May 2021

Candida da và niêm mạc mạn tính (Chronic mucocutaneous candidiasis: CMCC) là một nhóm hội chứng không đồng nhất với các đặc điểm chung của nhiễm nấm Candida mạn tính không xâm lấn ở da, móng và niêm mạc thường kháng điều trị tại chỗ và không có nhiễm nấm xâm lấn. Các dạng cổ điển có các biểu hiện liên quan tự miễn (thường gặp nhất là bệnh nội tiết), và bệnh nhân có thể bị nhiễm vi sinh vật khác. Các dạng nhẹ hơn có nhiễm nấm Candida miệng có hoặc không kèm theo nhiễm trùng da do tụ cầu. CMCC là do khiếm khuyết di truyền trong hệ thống miễn dịch.
Candida da niêm mạc mạn tính là một nhóm bệnh do suy giảm miễn dịch tiên phát có liên quan đến khiếm khuyết tế bào T. Di truyền có thể.
- Gen trội thường: Tham gia vào một đột biến trong bộ chuyển đổi tín hiệu và hoạt hóa của gen phiên mã 1 (STAT1).
- Gen lặn thường: Tham gia vào một đột biến trong gen điều hòa tự miễn (AIRE).
ĐẶC ĐIỂM LÂM SÀNG, CẬN LÂM SÀNG CƠN TIM NHANH Ở TRẺ EM TẠI BỆNH VIỆN NHI TRUNG ƯƠNG
Authors: Hoàng Văn Toàn , Đặng Thị Hải Vân , Nguyễn Thanh Hải
Published: May 2021

Mục tiêu: Mô tả đặc điểm lâm sàng, cận lâm sàng của cơn nhịp nhanh thất và trên thất ở trẻ em tại Bệnh viện Nhi Trung ương. Đối tượng và phương pháp nghiên cứu: Mô tả 89 trẻ có cơn tim nhanh tại Bệnh viện Nhi Trung ương từ tháng 3/2019-6/2020. Kết quả: Trong 89 trẻ có cơn nhịp tim nhanh, 71 trẻ nhịp nhanh kịch phát trên thất (supraventricular tachycardia-SVT) chiếm 79,8% và 18 trẻ nhịp nhanh thất (ventricular tachycardia-VT) chiếm 20,2%. Trẻ dưới 12 tháng chiếm tỷ lệ 42,7%. Có 36/89 trẻ có bệnh lý kèm theo, trong đó có 19/89 trẻ mắc tim bẩm sinh, chiếm 21,3%. SVT có suy tuần hoàn ít hơn (18,3% so với 55,6%; p = 0,003), tần số tim nhanh hơn (238,1 ± 31,0 so với 209,6 ± 34,0; p < 0,001), chỉ số phân suất tống máu thất trái (LVEF) giảm ít hơn (18,3% so với 44,4%, p < 0,029), thời gian QRS ngắn hơn (77,9 ± 23,0 so với 131,4 ± 23,6; p < 0,001) so với VT. Kết luận: SVT chiếm tỷ lệ cao, có tần số tim nhanh hơn, nhưng suy tuần hoàn thấp hơn so với VT và thường gặp ở trẻ nhỏ tuổi hơn. VT chiếm tỷ lệ suy tuần hoàn khá cao và thường găp ở trẻ lớn tuổi hơn.
Perancangan Aplikasi It Help Desk Menggunakan Platform Node.Js Pada Mittasys
Authors: Dwi Nurul Huda  , Aggry Saputra  , Yulinda
Published: May 2021

Mittasys is a company engaged in programming services. The company have not had a system that is able to handle the company's relationship with customers. In after-sales service, the company has not been able to maximize service of customer complaints or questions.Based on the existing problems, the authors built a help desk software web application. This web application uses waterfall as a method of development. The design of this application uses Node.js platform and uses a Microsoft SQL Server as a database. From the results of software design, it is expected to help the company in handling every customer who needs so as to improve service and produce accuracy in finding the data needed.
Correlation between hydronephrosis, tumor diameter, and pathologic T stage of upper tract transitional cell carcinoma after nephroureterectomy
Authors: Amornporncharoen Treerat , Wongwattanasatien Nattapong , Choonhaklai Vorapot , Chittchang Viroj , Pumpaisanchai Somkiet , Thaidumrong Tanet , Sindhubodee Sermsin , Kosrisirikul Chawawat , Huabkong Matchima
Published: May 2021

Objective: To evaluate the correlation between hydronephrosis, tumor diameter, and pT stage of upper tract transitional cell carcinoma.

Material and Method: From October 2004 to December 2018, the medical records of 98 patients in Rajavithi Hospital who were diagnosed with renal pelvic (47 patients) and ureteral (51 patients) transitional cell carcinoma and treated with nephroureterectomy were retrospectively reviewed. Patient demographics, degree of hydronephrosis, tumor diameter from computed tomography, and pathologic report were collected. Data were analyzed to determine correlations.

Results: In renal pelvic tumor, higher degree of hydronephrosis correlated with higher pT stage (p=0.022) but no significant difference was shown in ureteral tumor (p=0.352). For tumor diameter in both renal pelvis and ureter, there were no correlations with pT stage (p=0.128 and p=0.625). For tumor location, higher pT stage was more common in renal pelvic tumors (p=0.001) and high tumor grade correlated with high pT stage (p=0.037).

Conclusion: In this study, there was significant correlation between the preoperative degree of hydronephrosis and pT stage in renal pelvic transitional cell carcinomas; however, none was found in ureteric tumors. The reason may be that smaller ureteric lumen caused early symptoms, which concerned patients.
A COPPER JAVELIN HEAD IN THE UCL PALESTINIAN COLLECTION
Authors: Montanari Daria
Published: May 2021

Il giavellotto di rame presentato in questa sede, conservato nella collezione palestinese dello University College di Londra, è ritenuto proveniente dagli scavi condotti da W.M.F. Petrie nel sito di Tell el-‘Ajjul agli inizi del XX secolo. L’arma si presta ad un’analisi tipologica che consente di sostanziare meglio le ipotesi circa il contesto di provenienza e l’attribuzione cronologica.
Test-Driven Development: uma revisão sistemática
Authors: Benato Gustavo Baculi , Vilela Plínio Roberto Souza
Published: May 2021

Test-Driven Development (TDD) é uma prática de desenvolvimento de software que ganhou notoriedade quando Kent Beck a definiu como uma parte essencial da Extreme Programming (XP). O presente estudo analisou experimentos e conclusões de estudos, previamente publicados, em relação aos efeitos do TDD na produtividade dos desenvolvedores e na qualidade do software produzido, contrastando o TDD com o Test-Last Development (TLD). Para isto, foi conduzida uma revisão bibliográfica sistemática considerando artigos publicados entre 2003 e 2020. Ao final do processo de revisão, aproximadamente 73\% dos estudos analisados, consistiram em experimentos com TDD e em 27\% deles, o principal tema era o TDD em sua essência, detalhando-o. A análise realizada mostra que 43\% dos estudos apontaram um aumento considerável na qualidade do software, enquanto nenhum artigo apontou queda na qualidade. Em relação à produtividade, 28\% dos estudos apontaram queda na produtividade e 47\% foram inconclusivos. Via de regra, os estudos não apontaram melhorias significativas na produtividade quando o TDD foi utilizado. De acordo com a análise, o TDD promove maior qualidade, mesmo que alguns estudos apontem o contrário. Em relação à produtividade, o TDD é inconclusivo. Sendo assim, de acordo com os artigos analisados, não há uma posição final referente ao custo-benefício envolvido nesta prática, discutimos algumas possíveis razões para essa conclusão.
Working up an Apatite: Enigmatic Mesoarchean Hydrothermal Cu-Co-Au Mineralization in the Pilbara Craton
Authors: Fox David C.M. , Spinks Samuel C. , Barham Milo , Kirkland Christopher L. , Pearce Mark A. , Aspandiar Mehrooz , Birchall Renee , Mead Ed
Published: May 2021

Globally, significant examples of hydrothermal Cu-Co mineralization are rare within Archean greenstone belts, especially relative to the endowment of these terranes with other world-class hydrothermal ore deposits, particularly Au deposits. Using U-Pb geochronology of hydrothermal apatite, this study provides the first absolute age constraints on the timing of mineralization for the Carlow Castle Cu-Co-Au deposit. Carlow Castle is a complex, shear zone-hosted, veined Cu-Co-Au mineral system situated within the Paleo-Mesoarchean Roebourne greenstone belt of the Pilbara craton of northwestern Western Australia. Although U-Pb geochronology of this deposit is challenging due to low levels of radiogenic Pb in synmineralization apatite, mineralization is best estimated at 2957 ± 67 Ma (n = 61). Additionally, analysis of alteration phases associated with Carlow Castle mineralization suggests that it is dominated by a propylitic assemblage that is characteristic of alkaline fluid chemistry and peak temperatures >300°C. Within proximal portions of the northwest Pilbara craton, the period of Carlow Castle’s formation constrained here is associated with significant base-metal volcanogenic massive sulfide mineralization and magmatic activity related to back-arc rifting. This rifting and associated magmatic activity are the most likely source of Carlow Castle’s unique Cu-Co-Au mineralization. Carlow Castle’s Mesoarchean mineralization age makes it among the oldest discovered Cu-Co-Au deposits globally, and unique in the broader context of hydrothermal Cu-Co-Au deposits. Globally, hydrothermal Cu-Co mineralization occurs almost exclusively as Proterozoic and Phanerozoic stratiform sediment-hosted Cu-Co deposits due to the necessity of meteorically derived oxidized ore fluids in their formation. This research therefore has implications for exploration for atypical Cu-Co deposits and Cu-Co metallogenesis through recognition of comparably uncommon magmatic-hydrothermal Cu-Co-Au ore-forming processes and, consequently, the potential for analogous Cu-Co-Au mineralization in other Archean greenstone belts.
Exploring Online Student Engagement During COVID-19 Pandemic in Mongolia
Authors: Dembereldorj Zoljargal
Published: May 2021

Student online engagement has become a challenge for higher education in Mongolia during the COVID-19 pandemic. This study explores student engagement in online learning of Mongolian higher education during the lockdown period. The study assessed differences in student engagement across gender, the tools students used to study, their level of study, and their field of study. It also determined the associations between variables. The data were collected online using the questionnaire developed by Dixson (2015), the scale to measure student online engagement (OST) with four variables: skills, emotion, participation, and performance. The tests of Kruskal-Wallis, Shapiro-Wilk, Cramer’s V, Point biserial as well as Spearman rho were used for the analyses. The most significant variables to measure student engagement were participation and performance. One of the important results was that the internet access was highly correlated with the performance variable (p=.00). The study did not find any significant differences or correlation for “emotion” expressing the devotion and commitment to the online study.
Environmental Management Meeting the Requirements for Sustainable Development in Vietnam
Authors: Hien Phung Van
Published: May 2021

The State uses legal tools to manage the environment, because the environment plays a particularly important role in the survival and development of the ecosystem and humanity.
QUALITY OF LIFE AFTER INGUINAL HERNIA REPAIR
Authors: Iftikhar Nazish , Kerawala Asad
Published: May 2021

OBJECTIVES:
Inguinal hernias are the most commonly presented abdominal hernias with approximately 20 million people operated annually throughout the world. Severe chronic pain after hernia repair effects social life, daily activity and overall quality of life. The Short Form-36 is (SF-36) a validated indicator of overall health status. Studies have shown that the reliability of the SF-36 is exceeding 0.80. This study aims
to determine the severity of pain and quality of life after open inguinal hernia repair at a tertiary care hospital using SF-36.

METHODS
This cross-sectional study was carried out at Indus Hospital Karachi from 1st April 2018 to 10th September 2018.88 Patients were enrolled in this study according to the inclusion and exclusion criteria.
A written and informed consent was taken from all of them. After surgery they were sent home on painkillers. They were called at 4 weeks and were required to fill a pre designed questionnaire Short form -36.

RESULTS
Results showed that out of the 88 patients enrolled in this study 35 (39.8%) experienced mild pain, 37(42%) experience moderate pain and only 16 (18.2%) experienced severe pain. Quality of life was satisfactory in 72(81%) and unsatisfactory in 13(14.7%).

CONCLUSION:
Hence it is concluded that post operatively patients experienced better physical functioning and emotional role functioning whereas their perceptions about their general health and energy were satisfactory. Hernia surgery should be offered to all the patients with a clinically detectable hernia.
Inventarele de personalitate. Contextualizare si validitate predictiva
Authors: Stroescu Ovidiu
Published: May 2021

Cartea este structurata in jurul inventarelor de personalitate, ajutand cititorul sa inteleaga si sa se familiarizeze cu problematica acestora. Abordarea este complexa, autorul discutand teoria in care inventarele de personalitate se fundamenteaza, subliniind totodata principalul model uzitat. Intr-o nota obiectiva, autorul arata ca exista o serie de dificultati, de natura diferita, care contribuie deseori la o intelegere deficitara a validitatii predictive a inventarelor de personalitate. Autorul faciliteaza intelegerea cititorului cu privire la efectul cadrului de referinta („Frame-of-Reference” Effect, FOR) sau metoda contextualizarii inventarelor de personalitate, prezentand asumptiile de baza si mecanismul prin care opereaza, precum si evidente empirice privitoare la imbunatatirea validitatii predictive. Contributia personala a autorului ne arata ca este mai putin potrivit a utiliza contextualizarea in cazul persoanelor fara experienta in context, precum tinerii absolventi. Pentru a demonstra acest fapt, autorul adopta o abordare structurala a personalitatii. De asemenea, autorul introduce o problema metodologica si argumenteaza ca un nou mod de administrare a itemilor generali si contextualizati, simultan sau „in oglinda”, determina o validitate predictiva mai inalta, fara a creste riscul crearii unui artefact.
Monahismul in Dobrogea de la origini pana in zilele noastre
Authors: Holubeanu Ionut
Published: May 2021

Lucrarea pe care o prezentam este in realitate prima monografie cuprinzatoare a unei provincii romanesti si ea se adauga altor studii si carti publicate de acelasi autor pana acum. Ea se inscrie in lucrarile de elita ale istoriografiei din tara noastra si totodata constituie un volum de referinta pentru cercetarea viitoare.
ON THE CONSISTENCY OF THE LEAST SQUARES ESTIMATOR IN MODELS SAMPLED AT RANDOM TIMES DRIVEN BY LONG MEMORY NOISE: THE RENEWAL CASE
Authors:   Universidad Adolfo Ibáñez, Araya Héctor , Bahamonde Natalia ,   Pontificia Universidad Católica de Valparaíso, Fermín Lisandro ,   Universidad de Valparaíso, Roa Tania ,   Universidad Adolfo Ibáñez, Torres Soledad ,   Universidad de Valparaíso
Published: May 2021

In this study, we prove the strong consistency of the least squares estimator in a random sampled linear regression model with long-memory noise and an independent set of random times given by renewal process sampling. Additionally, we illustrate how to work with a random number of observations up to time T = 1. A simulation study is provided to illustrate the behavior of the different terms, as well as the performance of the estimator under various values of the Hurst parameter H.
How is the Work of Developers Measured? An Industrial and Academic Exploratory View
Authors: Ferreira Matheus Silva , Martins Luana Almeida , Júnior Paulo Afonso Parreira , Costa Heitor
Published: May 2021

Software project management is an essential practice to achieve the goal of success in these projects and a challenging task for the Project Manager (PM). Therefore, information about the work of developers can be valuable in supporting PM. Several studies have addressed this topic and suggested different strategies for obtaining such information. Given the variety of existing strategies, the need arises to know the state-of-the-art regarding the theme. In this paper, what relevant information for PM and how that information can support the project management practices are presented, especially regarding risk management and people management. So, we carry out an exploratory study applying the Systematic Literature Mapping technique. Contributions include the identification of 64 metrics, 4 sources of information, and 7 PM activities supported by the measurement of developer work. Be-sides, aspects to be explored on the subject are presented, inspiring new studies in the field of Software Engineering.
Heterogeneidade de Políticas Públicas de Formação Docente
Authors: Cassola Rosangela Vargas
Published: May 2021

Objetivamos identificar a potencialidade de utilização da TV Escola na formação contínua de professores que trabalham com alunos que apresentam necessidades especiais. A coleta de dados ocorreu em fases: usamos como instrumento um questionário, realizamos entrevista e procedemos a utilização da Técnica de Grupo Focal em seis encontros presenciais. Os dados revelam que os professores desconhecem os Programas da Série Educação Especial da TV Escola, bem como o conceito de deficiência mental e indicam que é possível usar a TV Escola como meio de formação contínua desde que considerados três aspectos: 1) aspectos organizacionais da escola; 2) questões profissionais de formação docente e 3) políticas de implantação da TV Escola.
Tecnologia e Interação: Possibilidades de uma Educação sem Distância
Authors: Salvago Blanca Martín
Published: May 2021

O presente artigo, baseado na Teoria da Distância Transacional, de Michael Moore, reflete a respeito do conceito de distância e suas implicações no processo de ensino e aprendizagem, seja presencial ou a distância. Distingue-se a distância física ou geográfica da distância psicológica. Assim como discute alguns aspectos relevantes que influenciam na sensação de distância de parte do aprendiz: a autonomia do aluno, o diálogo estabelecido entre os participantes de um curso e especificidades da comunicação na metodologia de Educação a Distância.
Prática Docente e Tecnologias Educacionais: um Estudo de Caso nos Anos Iniciais do Ensino Fundamental
Authors: Eleotério Valdênia Rodrigues Fernandes , Oliveira Adriana Da Silva Ramos de , Nascimento Sulamita Barreto
Published: May 2021

O artigo tem como tema a prática docente e as tecnologias na educação. Apresenta reflexões de um Trabalho de Conclusão de Curso, o objetivo foi compreender as dificuldades dos professores em utilizar tecnologias como recurso pedagógico. É um estudo de caso, de natureza qualitativa, com metodologia de uma pesquisa bibliográfica/de campo. Os resultados revelam os desafios que os professores têm enfrentado nas escolas. Conclui-se que o tema necessita de debates, para que os professores possam desenvolver práticas ativas para despertar nos alunos, desde o início da formação escolar a consciência científica, o pensamento crítico e o princípio ético na tomada de decisões para que possam construir o conhecimento com significado.
Ląstelės biologijos laboratoriniai darbai
Authors: Pukalskienė Milda
Published: May 2021

Suprasti mus supančių gyvų organizmų ląstelių funkcijas galime tik tada, kai žinome jų struktūrą. Pagrindinis knygos tikslas – supažindinti studentus su ląstelės biologijos laboratorinių darbų metodais ir priemonėmis. Leidinyje pateikiama medžiaga apie optinių ir elektroninių mikroskopų sandarą, rūšis, funkcijas, darbo techniką, saugumo reikalavimus, mikroskopinių preparatų ruošimą. Atliekant laboratorinius darbus, susipažįstama su spektrofotometrinių metodų principais, išmokstama, kaip kokybiškai ir kiekybiškai įvertinti ląstelės pigmentų, tirpių baltymų koncentraciją, išmatuoti fermentų aktyvumą. Knyga skirta Kauno technologijos universiteto Maisto mokslo ir technologijos, Pramoninės biotechnologijos ir Taikomosios chemijos bakalauro studijų programų studentams, studijuojantiems ląstelės biologiją.
Photodegradation of Melamine Using Magnetic Silicon Quantum Dots
Authors: MAHMOOD Iram , AHMAD Ishfaq , AHMAD Ishaq , ZHAO Ting-kai
Published: May 2021

Semiconductor Silicon quantum dots (SiQDs) and magnetic nanomaterials have been studied extensively for their variety of applications. We have presented a new method for the preparation of Magnetic Silicon Quantum Dots (Fe3O4/SiQDs) heterostructure nanocomposites. These nanocomposites are fluorescent, have excellent magnetic properties as well as high photocatalytic activity. Magnetic nanoparticles-semiconductor nanocomposites served as an effective recoverable photocatalyst for melamine degradation. In addition, due to their easy magnetic separation, these nanocomposites showed optimum catalytic activity for 15 cycles of usage.
Strafrecht und Gesellschaft
Authors: Ambos Kai
Published: May 2021

Günther Jakobs ist einer der bedeutendsten deutschen Strafrechtswissenschaftler und sein Einfluss reicht weit über die deutschen Grenzen hinaus, insbesondere in die uns besonders nahestehenden Rechtsordnungen des kontinentaleuropäischen Rechtskreises. Sein Werk beschäftigt sich mit den ideengeschichtlichen (rechtsphilosophischen und -historischen) Grundlagen des Strafrechts und seiner dogmatischen Ausgestaltung im sog. Allgemeinen, aber auch im Besonderen Teil, wobei Jakobs nicht nur eine „Anhäufung von Topoi“ (Cancio, S. 698) liefert, sondern ein holistisches System strafrechtlicher Zurechnung entwirft. Ein solcher - wie jeder - Systementwurf bringt es allerdings mit sich, dass die Überzeugungskraft der dogmatischen Ableitungen von der Plausibilität der systemischen Prämissen abhängt. Diese wie auch die Ableitungen - vor allem das „Feindstrafrecht“ - haben häufig heftige Reaktionen hervorgerufen, die sich jedoch mitunter mehr an der Person von Günther Jakobs als an seinen wissenschaftlichen Positionen abgearbeitet haben. Im Übrigen verzeichnet das Jakobssche Werk zahlreiche „blinde Flecken“, insbesondere was den Bereich des Strafprozessrechts, aber auch die Strafzumessung, Kriminologie und Kriminalpolitik betrifft, wobei die allenfalls stiefmütterliche Behandlung letzterer freilich nicht mit einer - häufig gegen Jakobs vorgebrachten - Wertneutralität verwechselt werden darf. Auf all dies werden wir im Folgenden zurückkommen, wobei ich die Besprechung abweichend vom rezensierten Werk strukturiert habe und - bei einem Werk von über 800 Seiten wohl selbstverständlich - einige (wenige) Beiträge nicht der ihnen verdienten Würdigung unterziehen konnte.
Verstößt die Urheberrechts-Richtlinie gegen die Medienfreiheit?
Authors: Oster Jan
Published: May 2021

Die Urheberrechts-Richtlinie 2001/29/EG verstößt gegen die Medienfreiheit gemäß Art. 11 Abs. 2 EUGRCh und Art. 10 EMRK. Die Ausnahmen und Beschränkungen der Urheberrechts-Richtlinie können einen angemessenen Ausgleich zwischen den Rechten des Urhebers und der Medienfreiheit im Einzelfall nicht gewährleisten. Der vorliegende Beitrag erläutert diesen Befund am Beispiel der urheberrechtlich privilegierten Berichterstattung über Tagesereignisse gemäß Art. 5 Abs. 3 Buchst. c) Var. 2 und des Zitatrechts nach Art. 5 Abs. 3 Buchst. d) Urheberrechts-Richtlinie im Lichte der Entscheidungen „Funke Medien“ (bzw. „Afghanistan-Papiere“) und „Spiegel Online“ (bzw. „Reformistischer Aufbruch“).
Water quality mathematical modelling for drainage water in rural communities
Authors: El Gohary
Published: May 2021

The research's main objective is to study water quality management techniques using different scenarios by applying three mathematical models. The study focuses on the Rosetta Branch-River Nile, which is considered the supreme contaminated Branch of river Nile. The study is composed of three main parts. First: Water quality modeling using WASP 6 was adopted to simulate the water quality status. This model was calibrated and used to simulate different scenarios presenting an alternative solution for the water quality problem in Rosetta Branch. They also optimized water quality indicators using the genetic algorithm to determine the optimum techniques essential to eliminating the Rosetta branch's water quality problem. Second: Mathematical Modeling Using the SOBEK model, measure the environmental effect of wastewater discharges on the water quality of the Rosetta branch, taking into account seasonal variations. Third: statistical analyses to research the association between discharge and concentration of ammonia using simple regression equations. The study is focused on theoretical and applied scientific Methodology. It concluded that increased discharge in the Branch does not significantly affect water quality in the Branch. However, the treatment processes appear to have a large and significant impact on the water quality instead of increasing discharge solution. There is an inverse relationship between the discharge in Rosetta Branch and ammonia concentrations. All relationships have a correlation coefficient of, on average of about 0.7. The paramount water quality challenging in the Branch is cumulative of ammonia and Biological Oxygen Demand (BOD) overhead guidelines. Moreover, improving water quality for point source effluents, particularly at El Rahawy drain, improves the Rosetta branch's water quality.
Elevating Students’ Mathematical Identities: A Heritage Project
Authors: Desai Siddhi , Safi Farshid , Kurtz Brianna
Published: May 2021

Ear to the Ground features voices from several corners of the mathematics education world.
Problems to Ponder
Authors: Holmstrom Megan , Korponic Megan
Published: May 2021

Problems to Ponder provides 28 varying, classroom-ready mathematics problems that collectively span PK–12, arranged in the order of the grade level. Answers to the problems are available online. Individuals are encouraged to submit a problem or a collection of problems directly to mtlt@nctm.org. If published, the authors of problems will be acknowledged.Megan Holmstrom and Megan Korponic
Processing Characterization of Sisal/Epoxy Prepregs
Authors: Silva Sayra O. , Teixeira Linconl A. , Gontijo Alexandre Bahia , Luz Sandra M.
Published: May 2021

Quality control to obtain composite laminates is frequently applied to synthetic fibers/epoxy prepregs. The gel time test, resin, volatiles and fiber content, drape measurement and tack tests together with water absorption capacity are methods currently employed. However, for natural fibers prepregs there is a gap in the literature, which makes their application difficult. Thus this work will investigate sisal fibers, which have low cost, high biodegradability and low specific weight, following the common methods to manufacture composites from natural fibers/epoxy prepregs. First, the prepregs were prepared by hand lay-up, aligning the fibers with epoxy, keeping 15% by weight content of fiber. After the quality control characterization, 3 mm thickness composite was prepared by using a press, and tensile tests and scanning electron microscopy (SEM) were applied. As a result, the resin fraction values and the solid content of the matrix showed little variation between the different samples. The natural fibers prepregs absorbed water quickly in the initial stage until reaching the saturation level. The NaOH-treated sisal/epoxy prepreg had a tension of 71.06 ± 8.28 kPa for the tack test and tensile strength of 69.24 ± 11.69 MPa. Finally, the NaOH-treated sisal 15 wt%/epoxy resulted in composites with a better performance than the neat epoxy resin. There was good adhesion between the fibers and matrix, as confirmed by SEM and mechanical tests.
Patentes sobre biomateriales derivados del cuerpo humano: derechos de propiedad industrial vs. derecho a la salud en México
Authors: Gutiérrez Avalos Karen Lizeth , Arcudia Hernández Carlos Ernesto
Published: May 2021

La concesión de patentes sobre biomateriales derivados del cuerpo humano plantea tensiones entre el derecho de propiedad industrial y el derecho a la salud. En el presente trabajo repasamos el derecho europeo de patentes como referente para interpretar la legislación mexicana en la materia. Y de otra parte, analizamos las implicaciones de concesión de biopatentes en el derecho a la salud en sus dos facetas: de acceso a los servicios de salud y de los parámetros éticos que se han de cumplir en investigaciones sobre salud en seres humanos. Por último, analizamos solicitudes presentadas ante el Instituto Mexicano de la Propiedad Industrial y comprobaremos si se cumplen o no con los parámetros marcados por la legislación en materia de salud.

Patents grants of biomaterials derived from the human body sets tension between the intellectual property law and the health  rights. In this paper we re-examine the Patents European Law as a guide to interpreter the Mexican law in this subject. And, on the other hand we analyze the implications on patent grants in both aspects of  health rights: in the access to the health services and in the ethics parameters that must be fulfilled in researches of human beings health. And, finally we analyze applications submitted to the Industrial Property Mexican Institute and verify if the parameters stated by the health legislation  are or are not obeyed.
Continuity and Development
Authors: Westhaver George
Published: May 2021

This article compares the typological exegesis promoted by E. B. Pusey (1800–82) and his colleagues John Henry Newman and John Keble with that of their eighteenth-century Hutchinsonian predecessor William Jones of Nayland (1726–1800). Building on Peter Nockles’s argument that Jones’s emphasis on the figurative character of biblical language foreshadows the Tractarian application of the sacramental principle to exegesis, this article shows how this common approach differs from the more cautious one displayed by the High Church luminaries William Van Mildert and Herbert Marsh. At the same time, both Pusey’s criticism of the mainstream apologetics of his day and his more explicit application of the doctrine of the Incarnation to exegesis resulted in bolder interpretations and a greater emphasis on the necessity of figurative readings (of both the Bible and the natural world) than Jones generally proposed. A shared appreciation of the principle of reserve may explain both these differences and the Tractarian emphasis on a patristic, rather than a Hutchinsonian, inspiration for their approach.
A Review-Reflection on African Feminisms 2019
Authors: Burger Bibi , Khosi Motlatsi , Brydon Lavinia
Published: May 2021

In this co-authored review-reflection, we discuss the African Feminisms 2019 conference, offering a snapshot of the vital and emboldening African feminist work being conducted by researchers, cultural producers and creative practitioners at all levels of their careers, as well as a sense of the emotional labour that this work entails. We note the particular, shocking event that took place in South Africa just prior to the conference informed the papers, performances and ensuing discussions. We also note that the conference and many of its attendees advocated for a variety of approaches (and more than one feminism) when seeking to challenge power.
Linking mPFC circuit maturation to the developmental regulation of emotional memory and cognitive flexibility
Authors: Klune Cassandra B , Jin Benita , DeNardo Laura A
Published: May 2021

The medial prefrontal cortex (mPFC) and its abundant connections with other brain regions play key roles in memory, cognition, decision making, social behaviors, and mood. Dysfunction in mPFC is implicated in psychiatric disorders in which these behaviors go awry. The prolonged maturation of mPFC likely enables complex behaviors to emerge, but also increases their vulnerability to disruption. Many foundational studies have characterized either mPFC synaptic or behavioral development without establishing connections between them. Here, we review this rich body of literature, aligning major events in mPFC development with the maturation of complex behaviors. We focus on emotional memory and cognitive flexibility, and highlight new work linking mPFC circuit disruption to alterations of these behaviors in disease models. We advance new hypotheses about the causal connections between mPFC synaptic development and behavioral maturation and propose research strategies to establish an integrated understanding of neural architecture and behavioral repertoires.
SAM homeostasis is regulated by CFIm-mediated splicing of MAT2A
Authors: Scarborough Anna M , Flaherty Juliana N , Hunter Olga V , Liu Kuanqing , Kumar Ashwani , Xing Chao , Tu Benjamin P , Conrad Nicholas K
Published: May 2021

S-adenosylmethionine (SAM) is the methyl donor for nearly all cellular methylation events. Cells regulate intracellular SAM levels through intron detention of MAT2A, the only SAM synthetase expressed in most cells. The N6-adenosine methyltransferase METTL16 promotes splicing of the MAT2A detained intron by an unknown mechanism. Using an unbiased CRISPR knock-out screen, we identified CFIm25 (NUDT21) as a regulator of MAT2A intron detention and intracellular SAM levels. CFIm25 is a component of the cleavage factor Im (CFIm) complex that regulates poly(A) site selection, but we show it promotes MAT2A splicing independent of poly(A) site selection. CFIm25-mediated MAT2A splicing induction requires the RS domains of its binding partners, CFIm68 and CFIm59 as well as binding sites in the detained intron and 3´ UTR. These studies uncover mechanisms that regulate MAT2A intron detention and reveal a previously undescribed role for CFImin splicing and SAM metabolism.
A new secure authentication based distance bounding protocol
Authors: Sultan Ahmed Raheeq , Rashid Imran , Khan Fawad , Tahir Shahzaib , Pasha Maruf , Sultan Aiman
Published: May 2021

Numerous systems are being employed in daily life where two entities authenticate each other over a range of distance. The distance involved is relatively small, but still attacks were documented. The distance bounding (DB) protocol was introduced to cater to security requirements. The schemes, however, are still prone to several threats; mainly the Relay Attack (Terrorist and Mafia Fraud). In Mafia Fraud, an attempts are made to get accepted as the prover either by replaying of messages or by the help a malicious key. In Terrorist fraud, an attempt is made to extract the secret from the verifying entity, either by extracting the key from the message captured or by physically tempering the verifying/proving entity. Therefore the mitigation of these attacks needs to be done; as to not put computational overhead on the scheme. The paper presents a comprehensive and comparative performance analysis of twelve DB protocols based on defined metrics. It also proposes a protocol which incorporates the design elements needed for added security, is computationally easy to implement and resistant to most of the threats mentioned. Analysis of the protocol is carried out against the security requirements.
EFFECT OF TIKTA KATU RASA OF SHIGRU (MORINGA OLEIFERA) IN THE MANAGEMENT OF HYPERLIPIDEMIA: AN OPEN CLINICAL TRIAL
Authors: Raj Saranya V R , Lomate Pankaj
Published: May 2021

Hyperlipidemia is one among the leading risk factors of cardiovascular diseases (CVD) accounting for one third of the total death around the world. As per Ayurveda, the abnormal hike of the 4th dhatu meda, results in Hyperlipidemia. The contemporary treatment for Hyperlipidemia using statin drugs have triggered many controversies due to the adverse effects on long term use. The concept of application of rasa in treatment is unique to Ayurveda. Tikta and katu rasa are said to have a scarifying effect on increased kapha and meda. The study was an open clinical trial on 30 patients selected through convenient sampling .15 ml of fresh juice of leaves of Shigru in the morning on empty stomach was administered for 14 days. The participants were assessed for subjective parameters and objective parameters before and after treatment and also after 1-month follow-up. The improvements in the subjective parameters like fatigue and breathlessness was found to be statistically significant (p < 0.001). The lipid profile of the participants also showed significant results after treatment and follow-up (p < 0.001). The pathophysiology of Hyperlipidemia as per Ayurveda can be explained as an initial phase of medo Dhatu Vriddhi and the latter phase of Ati Sthoulya, based on the pathological fluctuations in the quality of agni. The 14-day intervention was effective in correcting the decreased Dhatwagni, and the drying out excess kapha and meda instigating a depletory effect on medo Dhatu Vriddhi.
EFFECT OF CLINICAL YOGA PACKAGE ON QUALITY OF LIFE OF PERIMENOPAUSAL WOMEN: A RANDOMIZED CONTROLLED TRIAL
Authors: V P Sijna , M C Shobhana
Published: May 2021

Menopause is the most critical stage of women’s lives. The transition phase to menopause has an important influence on women’s physical, physiological and emotional wellbeing and overall quality of life. One of the major aims of health for all in the 21st century is the improvement in the quality of life. Aim and objective is to evaluate the effect of clinical yoga packages on the quality of life of perimenopausal women. It is a randomized controlled trial conducted in the Clinical research institute of yoga and Ayurveda under the department of Swasthavritta, Vaidyaratnam P S Varier Ayurveda College, Kottakkal. A total number of 40 participants were selected by using a prepared questionnaire. The participants were randomly assigned into the study group (received yoga) (n = 20) and control group (not received yoga) (n = 20). Menopause specific Quality of Life questionnaire was used to assess the quality of life in both groups before and after 60 days. For the study group, a clinical yoga program was conducted for 60 days. The paired t-test was used to compare the changes within the group and the unpaired t-test was used to compare between the groups. The results showed that there was a statistically significant difference in the study group (P < 0.05). Concluded that quality of life on perimenopausal women could be improved with a clinical yoga package for 60 days. Thus, implementing appropriate educational programs to promote the quality of life in perimenopausal women is recommended.