bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of Access and Equity in Higher Education System in Vietnam
Authors: Vu Hoang Linh , Nguyễn Thùy Anh
Published: December 2018

The higher education system in Vietnam has expanded rapidly during the past two decades. Yet, the equity in terms of access to higher education in the country is understudied. This paper is an attempt to look at Vietnam’s current higher education system in terms of access and equity. Using logistic regression model and data from the Vietnam Household Living Standard Survey 2016, the paper also examines the factors explaining the enrolment in higher education in Vietnam. It shows that there has been a wide gap in the access between the rich and the poor, and between the Kinh/Hoa majority and the ethnic minority group in Vietnam. Therefore, public policies to assist disadvantaged groups getting access to higher education will be needed
Chính quyền địa phương và thực hiện chính sách ứng phó biến đổi khí hậu tại Trung Quốc: Bài học kinh nghiệm cho Việt Nam
Authors: Nguyen Van Hoa
Published: December 2018

Trên cơ sở nghiên cứu một số tài liệu thứ cấp liên quan đến thực hiện chính sách biến đổi khí hậu ở chính quyền địa phương của Trung Quốc, bài viết tiến hành tổng thuật lại cách thức mà Trung Quốc làm cho chính quyền địa phương trở thành một chủ thể không thể thiếu trong quá trình thực hiện chính sách này. Từ đó phân tích và rút ra những bài học kinh nghiệm cho Việt Nam. Bài viết đúc kết được bốn bài học. Thứ nhất là cần kết hợp cách tiếp cận từ dưới lên và từ trên xuống trong quy trình chính sách ứng phó biến đổi khí hậu.  Thứ hai, chính quyền địa phương phải thật sự chuyển hoá, lồng ghép các mục tiêu về môi trường vào kế hoạch phát triển kinh tế-xã hội của địa phương mình. Thứ ba, xem trọng vai trò và tạo điều kiện cho tổ chức xã hội dân sự tham gia tích cực vào việc tương tác với chính quyền các cấp xuyên suốt quá trình chính sách ứng phó biến đổi khí hậu. Thứ tư, yếu tố tạo nên sự thành công trong việc thực hiện chính sách ứng phó biến đổi khí hậu là ý thức và quan niệm của địa phương và trung ương về môi trường.
ĐÁNH GIÁ SINH KHẢ DỤNG IN VIVO CỦA FAMOTIDINE TỪ VẬT LIỆU MẠNG LƯỚI 3D-NANO-CELLULOSE NẠP FAMOTIDINE ĐƯỢC TẠO RA TỪ ACETOBACTER XYLINUM TRONG MỘT SỐ MÔI TRƯỜNG NUÔI CẤY
Authors: Nguyen Thanh Xuan
Published: December 2018

Mạng lưới cấu trúc 3D-nano-cellulose (M3NC) có nhiều ứng dụng trong lĩnh vực y sinh và các hệ thống phân phối thuốc tiên tiến. Vật liệu M3NC tạo ra từ Acetobacter xylinum trong môi trường chuẩn (M3NC-MTC), nước dừa (M3NC-MTD) và nước vo gạo (M3NC-MTG) được nạp famotidine bằng phương pháp hấp thụ thu được các M3NC vận tải thuốc để khảo sát sinh khả dụng in vivo của thuốc. Nghiên cứu sinh khả dụng của vật liệu M3NC nạp famotidine được thực hiện trên thỏ và định lượng famotidine trong mẫu huyết tương bằng phương pháp HPLC. Kết quả cho thấy các loại vật liệu M3NC nạp famotidine có thể tạo hệ vận tải thuốc giải phóng kéo dài, trong đó thời gian giải phóng kéo dài của vật liệu M3NC-MTC nạp famotidine và M3NC-MTD nạp nạp famotidine cao hơn vật liệu M3NC-MTG nạp famotidine. Sinh khả dụng in vivo của vật liệu M3NC-MTC nạp nạp famotidine là 172%, M3NC-MTD nạp famotidine là 159%, M3NC-MTG nạp famotidine là 131% so với viên nén famotidine trên thị trường. Các loại vật liệu M3NC nạp famotidine đã làm tăng sinh khả dụng của famotidine so với viên nén famotidine thương mại.
Validation of a high-performance liquid chromatographic method with fluorecence detection for the quantification of flurbiprofen in tablets
Authors: Nguyen Thi Thanh Binh , Tran Anh Mai , Duong Thuan Hai , Nguyen Tung Huu , Bui Tung Thanh
Published: December 2018

In this study, a high-performance liquid chromatographic method with fluorecence detection was developed for the quantification of flurbiprofen in tablets. A C8 reverse phase column (5 μm, 120 Å, 4.6×150 mm) was used with a mobile phase of acetonitrile : water : glacial acetic acid (65 : 32.5 : 2.5, v/v/v) . The flow rate was 1 ml/min and the column effluent was monitored within 8 minutes. The excitation and emission wavelength were respectively 247 nm and 312 nm. The temperature of flow cell was set at 45˚C and detector sensitivity was 5. The retention time of flurbiprofen was found to be 3.78 minutes. The method was validated under the concentration range of 5 - 100 ng/ml with a tight linear correlation between peak area and sample concentration (R = 0.9999). The proposed method was found to be specific to flurbiprofen, accurate and precise. The percentage recovery was ≤ 100 ± 2%, the relative standard deviation of the repeatability was ≤ 2.08% and the relative standard deviation of the intermediate precision was ≤ 2.96%. The limit of detection and limite of quantification were respectively 0.010 and 0.025 ng/ml.
Một số yếu tố nguy cơ bệnh tim mạch trên cán bộ một trường Đại học ở Hà Nội năm 2016
Authors: Thơm Vũ Thị
Published: December 2018

Những năm gần đây, tỷ lệ mắc và tử vong do bệnh tim mạch ở Việt Nam ngày càng gia tăng. Chính vì vậy, chúng tôi tiến hành nghiên cứu mô tả cắt ngang một số yếu tố nguy cơ bệnh tim mạch trên 269 cán bộ, nhân viên một trường đại học ở Hà Nội năm 2016 trong độ tuổi từ 20 đến 64. Kết quả cho thấy 43,8% đối tượng thừa cân - béo phì; 12,3% tăng huyết áp; 29,0% rối loạn lipid máu. Tỷ lệ mắc các yếu tố nguy cơ ở nam cao hơn nữ. Tỷ lệ cán bộ nhân viên của trường mắc tăng huyết áp và rối loạn lipid máu thấp hơn so với cộng đồng. Có sự liên quan giữa giới tính với tình trạng thừa cân béo phì, tăng huyết áp, rối loạn lipid máu, trong khi nhóm tuổi chủ yếu liên quan tới tình trạng tăng huyết áp (p < 0,001).
ĐẶC ĐIỂM LÂM SÀNG, NGUYÊN NHÂN, PHÂN LOẠI SUY HÔ HẤP CẤP Ở TRẺ EM THEO KHÍ MÁU
Authors: Đếm Phạm Văn
Published: December 2018

SUMMARY

THE CLINICAL FEATURE, CAUSES AND CLASSIFICATION OF PEDIATRIC ACUTE RESPIRATORY FAILURE THROUGH ARTERIAL BLOOD GAS

Pham Thi Que, Pham Van Thang

Ha Noi Medical University

 

Objectives: The study to describe clinical feature, causes and classification of acute respiratory failure in children through arterial blood gas in the Intensive Care Unit of Vietnam National Children's Hospital.

Subjects and Methods: Aprospective descriptive study on 96 patients with acute respiratory failure in the Intensive Care Unit in Vietnam of National Children's Hospital from 10/2016 to 10/2017.

Results: Type 2 acute respiratory failure was 55,2%, followed by type 1 with 25% and type 3 with 19,8%. Total patients with type 1 respiratory failure had tachypnea, cyanosis and SpO2 ˂ 90% and bilateral parenchymal lung injury. Type 2 acute respiratory failure can have symptoms like brachypnea, acynosis, SpO2 ≥ 90%. Wheezing is most common; emphysema and atelectasis with 37,2%. Bronchopneumonia is the most common cause of acute respiratory failure, including 61,1% type 2 acute respiratory failure.

Conclusion: Based on the clinical feature of acute respiratory failure as a basis for assessing severe condition and appropriate treatment interventions.

Key words: classification of acute respiratory failure, arterial blood gas.
Diversity of vascular plants at Tan Trao historic site, Tuyen Quang province
Authors: Cong Ba Do
Published: December 2018

The flora at Tan Trao historical site, Tuyen Quang province is quite rich and varied. Initially, there were 726 species, 462 genera, 137 families, belonging to 6 vascular plant species. Among them, Magnoliophyta has the largest number of 669 species (accounting for 92.15%), 427 (accounting for 92.42%) and 115 families (accounting for 83.94%). Followed by the Polypodiophyta with 39 species (5.37%), 25 genera (5.41%), 13 families (9.49%). Psilotophyta, Lycopodiophyta, Equisetophyta, Pinophyta are the rest. The Magnoliophyta is the most diversified, with 5.82 species per family and 3.71 families per family. The survival spectrum of the Tan Trao historical flora was determined as SB = 73.55 Ph + 3.17 Ch + 9.78 He + 8.40 Cr + 5.10 Th. For the value of use, medicinal plants have the most abundant species with 470 species, timber trees have 188 species, 142 species are eatable, 99 species are ornamental plants, 64 species are for animal feed,  50 species are giving attar , 28 species  are fibre plants,11 species are used for handicrafts, 5 species of dyes, and the lowest of 3 species for sap plants.
Phân lập Phân lập một số chủng vi khuẩn lam Nostoc từ đất trồng tỉnh Nghệ An và đánh giá sự sinh trưởng, sự cố định nitrogen của chúng
Authors: Đức Diện Nguyễn
Published: December 2018

Tóm tắt: Nostoc là một trong những nhóm vi khuẩn lam (Cyanobacteria) có cấu trúc dạng sợi, có tế bào dị hình, quang tự dưỡng, thường phân bố rộng rãi trong đất trồng. Nghiên cứu này trình bày kết quả phân lập một số chủng vi khuẩn lam Nostoc từ đất trồng lúa, cây công nghiệp ở tỉnh Nghệ An và đánh giá sự sinh trưởng, khả năng cố định nitơ phân tử của chúng; hướng đến mục tiêu sản xuất sinh khối vi khuẩn lam Nostoc để làm phân đạm hữu cơ. Kết quả đã phân lập thành công 5 chủng vi khuẩn lam Nostoc, bao gồm 3 chủng biểu hiện màu xanh lam (Nostoc calcicola HN9-1a, Nostoc linckia Cam-C1, Nostoc paludosum ĐT3-02) và 2 chủng biểu hiện màu nâu (Nostoc ellipsosporum NH2X7, Nostoc gelatinosum TT3-05)  trong điều kiện ánh sáng trắng. Trong môi trường BG-11 và ánh sáng đèn neon, 3 chủng màu xanh lam sinh trưởng tốt hơn và đạt năng suất sinh khối khô (387 – 431 mg/L sau 21 ngày nuôi) cao hơn so với 2 chủng màu nâu (310 – 370 mg/L sau 21 ngày nuôi). Các chủng vi khuẩn lam Nostoc này đều có khả năng cố định nitrogen; đặc điểm này được nhận biết thông qua sự biểu hiện gen NifD và sự hình thành tế bào dị hình của chúng. Kết quả nghiên cứu cũng cho thấy chủng vi khuẩn lam không có tế bào dị hình Pseudanabaena dictyothalla QV3-11 phân lập từ đất trồng lúa tỉnh Nghệ An không có khả năng cố định nitrogen. Những chủng Nostoc có khả năng cố định nitrogen này có thể làm nguồn nguyên liệu để nghiên cứu theo hướng sản xuất phân bón sinh học.
All trans retinoic acid inhibits the gene expression of self-renewal and Notch signaling pathway in gastric cancer cells
Authors: NGUYEN PHU HUNG , Ngo Thu Ha , Luu Thi Binh
Published: December 2018

All trans retinoic acid (ATRA) plays an important role in many cellular processes and is a potent promising substance for cancer therapy. The self-renewal is a prominent feature of cancer stem cells that is tightly controlled by a number of specific genes, and is also mediated by the cell signaling pathways. The Notch signal pathway has been shown to be one of the few major molecular signaling pathways of cancer stem cells, which regulates self-renewal and survival of cancer stem cells. In this study, we showed that ATRA reduced the expression of important genes involved in self-renewal of cells including Sox2, KLF4, DMNT1 and MYC as well as TBGUT markers such as CD24, MUC1 and CD90. Furthermore, we indicate that the ATRA-induced expression of self-renewal genes and cancer stem cell markers of gastric cancer stem cells can be mediated by the regulation of the Notch signaling pathway.
Dẫn liệu về thành phần loài và phân bố của khu hệ rết lớn (Chilopoda: Scolopendromorpha) tại Vườn Quốc gia Kon Ka Kinh và Khu bảo tồn thiên nhiên Kon Chư Răng, tỉnh Gia Lai.
Authors: Xuân Sơn Lê
Published: December 2018

Nghiên cứu khu hệ rết lớn tại Vườn Quốc gia (VQG) Kon Ka Kinh và Khu bảo tồn thiên nhiên (KBTTN) Kon Chư Răng, tỉnh Gia Lai đã được thực hiện trong thời gian 2017 - 2018, vào hai mùa chính là mùa mưa (tháng 5, 6) và mùa khô (tháng 11, 12).

Đã xác định được 12 loài thuộc 3 giống và 2 họ. Trong đó, có 1 loài lần đầu tiên ghi nhận được ở Việt Nam và 6 loài lần đầu tiên ghi nhận cho khu hệ. Trong hai họ ghi nhận được tại khu vực thì họ Scolopendridae Pocock, 1895 chiếm ưu thế hơn với 11 loài, còn họ Cryptops Leach, 1815 chỉ có 1 loài duy nhất. Các loài ghi nhận được phân bố tập trung nhiều nhất ở sinh cảnh rừng nguyên sinh, còn ở rừng thông ít đa dạng nhất. Vào mùa mưa, số lượng loài ghi nhận được nhiều hơn ở mùa khô. Riêng với giống Cryptops Leach, 1815 chỉ ghi nhận được vào mùa mưa.
A new record species in the genus Alpinia (Alpinia graminifolia D. Fang & G.Y. Lo) for Vietnam flora
Authors: Nguyen Thanh Trung
Published: December 2018

The genus Alpinia Roxb. is one of the largest genera of Zingiberaceae family, with about 250 species on the world and 35 species in Vietnam. Many species of Alpinia are used in traditional medicine of Vietnam such as Alpinia oblongifolia, Alpinia oxyphylla,... In this article, Alpinia graminifolia - a new record species for Vietnam flora was discovered in the mountain of Northern Vietnam (Quang Ninh province and Bac Giang province). Specimens were collected in Quang Ninh province (Uong Bi City, Thuong Yen Cong commune, Yen Tu mountain) and Bac Giang province (Son Dong dist., Thanh Luan commune), deposited at the Vietnam National Museum of Nature (VNMN), herbarium of Hanoi University of Pharmacy (HNIP), herbarium of Institute of Ecology and Biological Resources (HN).
Kinetic Study of Epoxidation of Rubber Seed Oil Using Tungstate-based Catalyst
Authors: Thủy Nguyễn Thị
Published: December 2018

By performing the reaction for one hour at three different temperatures, the thermodynamic properties of the epoxidation reaction using tungstate-based catalyst of RSO and eRSO were determined. The rate constant of these epoxidation reactions were varied from 0.57.10-2 to 1.01.10-2 l.mol-1.s-1 with RSO and 0.97.10-2 to 1.76.10-2 l.mol-1.s-1 with eRSO. The activated energies of reaction were 6.2 and 6.6 kcal.mol-1, respectively. The enthalpy ΔH was positive indicating that the epoxidation process was a endothermic reaction, but the free-energy ΔF was also positive, so there was a specific temperature at which the epoxidation process was the most effective. Experimental results showed that 60oC was the most suitable temperature for epoxidation reaction of both RSO and eRSO with the conversion of 91.37% (RSO) and 94.87% (eRSO), the yield of 75.06% (RSO) and 89.56% (eRSO) and the selectivity was 0.82 (RSO) and 0.94 (eRSO), respectively.
Study on Selectivity of Tungstate-based catalyst in Epoxidation Reaction of modified and non-modified Rubber Seed Oil
Authors: Thủy Nguyễn Thị
Published: December 2018

The selectivity of tungstate-based catalyst in the epoxidation reaction of rubber seed oil and modified rubber seed oil was studied in two ways. The titration method was performed according to the ASTM standard and the H-NMR method was based on the peaks of the three different standard groups. The catalyst selectivity of the epoxidation reaction of modified rubber seed oil was much higher than that of non-modified rubber seed oil for both methods. The average catalyst selectivity obtained by using H-NMR method of the modified rubber seed oil epoxidation reaction was equal, while of the rubber seed oil epoxidation reaction was 11% lower than that of the titrimetric method. For both types of oils, the difference between the catalytic selectivity obtained by using titration method and by using protons in group α-CH2-(C=O)-O- as the standard peak was the smallest and was the biggest when the protons in group -CH3 was used as the standard peak.
Syntheses and Structures of Ni(II) Complexes Containing 2‑alkyliminomethyl Pyrene Ligands
Authors: Luong Xuan Dien , Nguyen Truong Xuan , Ngo Quan Duc
Published: December 2018

The N,O-bidentate ligand 2-((methylimino)methyl)pyren-1-ol (1) gives with nickel acetate in a mixed solvent of toluene and ethanol in the presence of NaOAc the nickel(II) complex 1(Ni). It was characterized by elemental analysis, IR, NMR, MS spectroscopy and single crystal X-ray diffraction. With respect to the nickel atom the complex 1(Ni) adopts a distorted square planar trans-coordination geometry. Concerning the ligand arrangement, complex 1(Ni) has a step configuration with the angle of 35.5o between the mean planes of the pyrene rings in the two independent molecules and step distance S = 1.93 Å, whereas the referent nickel(II) bis(salicylaldiminato) takes a much smaller step configuration with an angle of 17.6o and the step distance S = 0.845 Å (chart 1).
Authors: Dương Hồng Anh , Phạm Việt Hùng , Nguyễn Tuyến Văn , Đặng Tuyết Anh Thị , Ngô Anh Quốc
Published: December 2018

Pellionia latifolia (Blume) Boerl. (Urticaceae) is found a lot in the Northwest of Vietnam such as Son La, Lao Cai, Yen Bai, Ha Giang. It has been used in traditional Viennamese folk medicine for treatment of several diseases related liver. Phytochemical investigation of the ethanol extract of Pellionia latifolia led to the isolation of five compounds as flowing: cycloartenol (1), b-sitosterol (2), oleic acid (3), glucose (4) and b-sitosterolglucoside (5). Their chemical structures were proved by spectroscopic methods including MS, 1H-NMR and 13C-NMR and comparison of spectral data with previously reported values.
Đa hình trình tự promoter của gen CYP2E1 ở đối tượng công nhân ngành sản xuất sơn bị phơi nhiễm với dung môi hữu cơ
Authors: Quang Huy Nguyen
Published: December 2018

CYP2E1 là gen mã hóa enzyme CYP3E1 đóng vai trò quan trọng trong quá trình chuyển hóa của nhiều  hợp chất hữu cơ được dùng phổ biến trong công nghiệp như benzen, toluen, xylen, styren (B, T, X, S). Sự xuất hiện các biến thể trên vùng promoter của gen CYP2E1 có thể dẫn tới sự thay đổi mức độ biểu hiện của gen và tiến triển của một số bệnh ở đối tượng phơi nhiễm với dung môi hữu cơ. Trong nghiên cứu này, chúng tôi phân tích các điểm đa hình trên đoạn promoter của gen CYP2E1 ở 118 người bao gồm 73 công nhân làm việc tại công ty sản xuất sơn bị phơi nhiễm với dung môi hữu cơ và 45 công nhân may không bị phơi nhiễm (đối chứng) thông qua phương pháp PCR và giải trình tự. Kết qủa ban đầu cho thấy, đã khuếch đại được trình tự DNA đoạn promoter gen CYP2E1 trên tất cả các mẫu và phát hiện được 4 điểm đa hình bao gồm 3739G>C, 3519T>G, 3468T>A và 3620C>T. Phân tích thống kê cho thấy không có sự khác biệt có ý nghĩa về phân bố của các đa hình trong nhóm phơi nhiễm dung môi hữu cơ và nhóm đối chứng, nhưng kiểu gen liên quan đến promoter của CYP2E1 là không đồng nhất giữa các đối tượng được nghiên cứu
Determination method and distribution of phthalate diesters in beverage collected from Hanoi, Vietnam
Authors: Tran Tri
Published: December 2018

Phthalates, industrial synthetic chemicals, have been widely used in consumer products to improve the flexibility of plastics. The fact shows that the more plastic products (cosmetics, beverage covered by plastic, personal care products, food wrap film, etc.) are used, therefore, the more phthalates are found in various environments such as sludge, dust, air, and water. In spite of their significant benefits in our lives and industry, their effects on the reproductive and toxicities in laboratory animals have been shown. However, the comprehension of phthalates has been limited. In this work, the method for determination of phthalates in beverage by gas chromatography tandem mass spectrometry (GC/MS) technique has been optimized. The method quantitative limits for phthalates ranged from 0.3 to 1.5 ng/mL. The recoveries of surrogate compounds for procedural blanks ranged from 73.4 to 91.6%, with RSD<10.7%. The total concentrations of phthalates in several kinds of beverage collected from Hanoi, Vietnam were found at ranging of 18.0 - 87.5 ng/mL. However, these values were much lower than the permissible limit of di(2-ethylhexyl)phthalate (DEHP) only in beverage by Vietnam Ministry of Health (1500 ng/mL).
Pemanfaatan Ekstrak Daun Tembakau sebagai Inhibitor Korosi pada Logam Baja Karbon dan Aluminium
Authors: Setiawan Adhi , Mayangsari Novi Eka , Dermawan Denny
Published: December 2018

Ekstrak daun tembakau dapat dimanfaatkan sebagai inhibitor korosi pada logam baja karbon dan aluminum di dalam larutan HCl. Penelitian ini bertujuan menganalisis pengaruh konsentrasi ekstrak daun tembakau terhadap laju korosi serta efisiensi inhibisi korosi logam baja karbon dan aluminium di dalam media larutan HCl 0,1 M. Laju korosi logam baja karbon dan aluminium dianalisis menggunakan metode polarisasi linear. Hasil penelitian menunjukkan bahwa peningkatan konsentrasi ekstrak daun tembakau dapat menurunkan laju korosi pada logam baja karbon dan aluminium. Laju korosi minimum baja karbon dan aluminium terjadi  pada konsentrasi inhibitor sebesar 700 mg/L yaitu masing-masing sebesar 0,940 mm/y dan 0,807 mm/y. Peningkatan konsentrasi inhibitor menyebabkan peningkatan efisiensi inhibisi korosi baja karbon dan aluminium. Hasil SEM menunjukkan bahwa peningkatan konsentrasi inhibitor menyebabkan proteksi korosi semakin tinggi sehingga tingkat degradasi permukaan logam akibat korosi semakin rendah.
Kajian Kapasitas Infiltrasi Lahan Jeruk dan Karet Di Daerah Pasang Surut Desa Sebawi Kabupaten Sambas
Authors: Saputra Rendi , Chandra Tino Orciny , Junaidi Junaidi
Published: December 2018

Penelitian ini bertujuan untuk mempelajari laju atau kapasitas infiltrasi pada lahan yang berbeda (lahan jeruk dan lahan karet) pada wilayah pasang surut di Desa Sebawi Kabupaten Sambas. Pengukuran laju infiltrasi dilakukan pada 4 titik pengukuran tiap lahan, sehingga diperoleh 8 titik pengukuran. Laju infiltrasi diukur dengan menggunakan alat infiltrometer cincin ganda. Keberadaan vegetasi seperti rerumputan memberikan perbedaan laju infiltrasi yang nyata. Dari hasil pengukuran di lapangan, diperoleh pengukuran laju infiltrasi pada lahan jeruk pada saat pasang yaitu 11,78 cm/jam sedangkan pada lahan karet 4,79 cm/jam dan pada saat surut laju infiltrasi lahan jeruk 15,30 cm/jam sedangkan di lahan karet 8,58 cm/jam. Dari hasil analisis laboratorium yang dilakukan bahwa tekstur tanah di dominasi oleh liat, dan menunjukkan t hitung pada lahan jeruk dan lahan karet bahwa bobot isi, porositas, kadar air, berat jenis partikel dan permeabilitas tanah tidak berbeda nyata terhadap t tabel. Tanaman penutup tanah seperti rerumputan sangat membantu meningkatkan porositas tanah, sehingga semakin banyak tanaman penutup tanah dan rerumputan maka laju infiltrasi semakin baik.Kata kunci : Lahan, Infiltrasi, Permeabilitas, Kebun, Infiltrometer Ring Ganda.
Potensi Bakteri Indigenous pada Tanah Tailing Kecamatan Mandor dalam Remediasi Metil Merkuri
Authors: Rezekikasari Rezekikasari , Gafur Sutarman , Susana Rini
Published: December 2018

Kecamatan Mandor memiliki banyak lahan penambangan emas baik yang aktif digunakan maupun yang telah ditinggalkan. Wilayah-wilayah yang pernah dibuka sebagai tempat usaha penambangan emas tidak pernah diupayakan untuk membersihkan sisa-sisa merkuri yang digunakan sebagai bahan pemisah butiran emas baik oleh pihak pemerintah, swasta maupun perorangan. Akibatnya wilayah ini menjadi lahan kritis yang rawan dampak pencemaran wabah penyakit yang disebabkan oleh paparan metil merkuri. Penelitian ini bertujuan mengeksplorasi bakteri yang berasal dari Kecamatan Mandor dan memiliki kemampuan mereduksi metil merkuri secara in vitro.  Isolat yang diperoleh adalah  isolat yang dapat dijadikan sebagai agent yang mampu memulihkan lahan yang tercemar metil merkuri. Penelitian dilakukan pada skala laboratorium dan diperoleh sebanyak 20 isolat yang tersebar dari beberapa lokasi pengambilan sampel. Isolat bakteri ditumbuhkan dengan menggunakan metode tuang yang menggunakan media nutrien agar. Dari 20 isolat yang ditemukan 6 diantaranya adalah isolat yang memiliki kemampuan hidup pada media yang ditambahkan metil merkuri mulai taraf konsentrasi 5 ppm, 10 ppm dan 15 ppm Hg.Kata kunci : Bakteri Indigenous, Metil Merkuri dan Tailing.
Studi Sifat Fisik Tanah Pada Kebun Karet Dan Kelapa Sawit Di Desa Rasan Kecamatan Ngabang Kabupaten Landak Wirahadi
Authors: Riduan Riduan , Junaidi Junaidi , Hayati Rita
Published: December 2018

Penelitian ini bertujuan untuk membandingkan sifat fisik tanah pada kebun karet dan kelapa sawit di Desa Rasan Kecamatan Ngabang Kabupaten Landak. Titik pengamatan sampel tanah di ambil pada kebun karet dan kelapa sawit dengan kedalaman 0-30 cm dan 30-60 cm. Parameter pengamatan yang digunakan pada penelitian ini terdiri dari karakteristik sifat fisik tanah yaitu warna tanah, struktur tanah, tekstur tanah, bobot isi tanah, kadar air kapasitas lapangan, porositas tanah, permeabilitas tanah, kemantapan agregat tanah, kandungan C-organik, N-total, C/N rasio, dan reaksi tanah (pH).Hasil pengamatan warna tanah di lapangan pada kebun karet dan kelapa sawit diketahui bahwa, terdapat beberapa perbedaan dan persamaan pada setiap titik pengamatan. Struktur tanah kebun karet dengan kedalaman 0-30 cm dan 30-60 cm gumpal membulat dan butir (granular) sedangkan pada kebun kelapa sawit dengan kedalaman 0-30 cm dan 30-60 cm struktur tanah yaitu gumpal bersudut. Sementara tekstur tanah pada kebun karet kedalaman 0-30 cm dan 30-60 cm termaksuk lempung liat berpasir dan lempung berliat sedangkan tekstur tanah pada kebun kelapa sawit dengan kedalaman 0-30 cm dan 30-60 cm termasuk lempung liat berpasir, liat dan lempung berliat.Kemantapan agregat tanah lebih tinggi pada kebun kelapa sawit dibandingkan dengan kebun karet. Sementara hasil analisis bahan organik pada kebun karet dan kelapa sawit tergolong rendah sampai dengan sangat rendah baik itu pada kedalaman 0-30 cm maupun 30-60 cm, N-total rendah sampai dengan sangat rendah, dan C/N rasio rendah serta reaksi tanah (pH) masam sampai sangat masam. Kata kunci : Ultisol, Sifat Fisik Tanah, Karet dan Kelapa Sawit.
Pengaruh Kompos Tandan Kosong Kelapa Sawit terhadap Pertumbuhan dan Hasil Lobak pada Tanah Aluvial
Authors: Santi Agnes , Rahayuni Tri , Santoso Eddy
Published: December 2018

Penelitian ini bertujuan untuk mengetahui pengaruh kompos tandan kosong kelapa sawit terhadap pertumbuhan dan hasil lobak pada tanah aluvial. Penelitian dilaksanakan dikebun percobaan Fakultas Pertanian Universitas Tanjungpura, dilaksanakan pada tanggal 15 April 2014 sampai dengan tanggal 29 Mei 2014. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) yang terdiri dari 5 perlakuan dan 4 ulangan, setiap ulangan terdiri dari 4 sampel tanaman jadi terdapat 80 polibag tanaman. Perlakuan yang dimaksud adalah t1 = 5% bahan organik, t2 = 10 % bahan organik, t3 = 15% bahan organik, t4 = 20% bahan organik, t5 = 25% bahan organik. Variabel yang diamati dalam penelitian ini adalah jumlah daun (helai), berat basah bagian atas tanaman (g), berat basah umbi tanaman (g), panjang umbi tanaman (cm), diameter umbi tanaman (cm). Hasil penelitian menunjukkan bahwa pemberian kompos tandan kosong kelapa sawit, berpengaruh nyata terhadap variabel pengamatan jumlah daun pada minggu ke-4, ke-6, berat basah bagian atas tanaman, berat basah umbi pertanaman, panjang umbi pertanaman, dan diameter umbi pertanaman. Tetapi pemberian kompos tandan kosong kelapa sawit berpengaruh tidak nyata terhadap variabel pengamatan jumlah daun pada minggu ke-2. Pemberian 20% bahan organik memberikan pertumbuhan dan hasil lobak yang terbaik.Kata kunci : Aluvial, Kompos Tandan Kosong Kelapa Sawit, Lobak.
Kadar Hara Npk Tanaman Kelapa Sawit pada Berbagai Tingkat Kematangan Tanah Gambut Di Perkebunan Kelapa Sawit PT. Peniti Sungai Purun Kabupaten Mempawah
Authors: Saputra Bayu , Suswati Denah , Hazriani Rini
Published: December 2018

Kadar hara merupakan proses untuk mengetahui kandungan unsur hara yang ada didalam jaringan tanaman. Kadar hara diperoleh melalui survey lapangan dan analisis unsur hara di laboratorium. Penelitian ini bertujuan untuk mengetahui Kadar hara N, P dan K serta merekomendasi penggunaan hara N, P dan K untuk tanaman kelapa sawit sehingga dapat meningkatkan produksi kelapa sawit. Penelitian ini dilakukan di PT. Peniti Sungai Purun Kabupaten Mempawah. Hasil Analisis menunjukkan bahwa kadar hara N, P dan K pada Blok G50 tergolong defisiensi sampai optimum, Blok H34 tergolong defisiensi sampai optimum, Blok I26 tergolong defisiensi sampai optimum, dan Blok J26 tergolong defisiensi sampai optimum. Pada masing-masing Blok di Rekomendasikan dosis pemupukan N, P dan K untuk blok G50 (1,73 kg urea/pohon/tahun, 1,50 kg Rock Phospate/pohon/tahun, dan 2,50 kg KCl/pohon/tahun). Blok H34 (3.00 kg urea/pohon/tahun, 3,50 kg Rock Phospate/pohon/tahun, dan 3,50 kg KCl/pohon/tahun). Blok I26 (1,73 kg urea/pohon/tahun, 1,50 kg Rock Phospate/pohon/tahun, dan 2,50 kg KCl/pohon/tahun). Blok J26 (3,00 kg urea/pohon/tahun, 3,50 kg Rock Phospate/pohon/tahun, dan 3.50 KCl/pohon/tahun). Dosis rekomendasi digunakan untuk meningkatkan produksi tanaman Kelapa Sawit di PT. Peniti Sungai Purun.Kata Kunci : Kadar Hara, Rekomendasi Pemupukan
Analisis Risiko Produksi Usaha Tani Karet Unggul dan Karet Lokal Di Desa Sekura, Kecamatan Teluk Keramat, Kabupaten Sambas
Authors: Suryani Suryani , Kusrini Novira , Imelda Imelda
Published: December 2018

Penelitian ini bertujuan untuk Menganalisis seberapa besar Risiko Produksi Pada Kelompok (1) Umur Tanaman 15 dan 16 Tahun, Kelompok (2) Umur Tanaman 17 dan 18 Tahun, dan Kelompok (3) Umur Tanaman 20 Tahun Usahatani Karet Unggul dan Karet Lokal di Desa Sekura Kecamatan Teluk Keramat Kabupaten Sambas dan untuk Membandingkan Risiko Produksi Usahatani Karet Unggul dan Karet Lokal di Desa Sekura Kecamatan Teluk Keramat Kabupaten Sambas. Pada penelitian ini menggunakan metode survey dengan lokasi penelitian di Desa Sekura Kecamatan Teluk Keramat Kabupaten Sambas. Lokasi penelitian ditentukan dengan sengaja (purposive), populasi dalam penelitian ini adalah petani karet unggul dan petani karet lokal sebanyak 84 orang dengan 42 orang petani karet unggul dan 42 orang petani karet lokal. Variabel penelitian meliputi Risiko produksi usahatani karet unggul dan karet lokal. Tekhnik analisis data yang digunakan adalah koefisian variasi (CV).Hasil penelitian dari ketiga kelompok umur tanaman karet unggul maupun lokal yaitu umur 15 dan 16 tahun, 17 dan 18 tahun, dan 20 tahun. Ternyata yang paling berisiko adalah pada umur 20 tahun dengan nilai CV 1 = 0,47 > CV 2= 0,37. dan produksi yang dihasilkan usahatani karet unggul lebih besar daripada produksi karet lokal. Risiko produksi usahatani karet unggul lebih besar atau sama dengan risiko produksi karet lokal dengan nilai CV 1 = 0,36 ≥ CV 2 = 0,32Kata Kunci : Risiko Produksi, Usahatani, Karet Unggul, Karet Lokal
UJI PATOGENISITAS NEMATODA PATOGEN SERANGGA (Steinernema carpocapsae) DARI TANAH GAMBUT TERHADAP RAYAP TANAH (Coptotermes curvignathus)
Authors: Paster Ari , Hendarti Indri , Ramadhan Tris Haris
Published: December 2018

Rayap tanah (Coptotermes curvignathus) merupakan salah satu hama yang menimbulkan kerugian ekonomis yang sangat besar karena banyak menyerang tanaman pertanian sehingga menyebabkan tanaman mati dan produksi menurun. Salah satu cara pengendalian yaitu secara biologis menggunakan nematoda patogen serangga (Steinernema carpocapsae). Penelitian ini bertujuan untuk melihat daya patogenisitas S. carpocapsae dari isolat tanah gambut terhadap rayap tanah (C. curvignathus). Penelitian dilaksanakan di Laboratorium Hama Tumbuhan, Fakultas Pertanian, Universitas Tanjungpura Pontianak. Rancangan yang digunakan Rancangan acak kelompok (RAK) dengan menggunakan satu perlakuan dan 6 taraf  konsentrasi S. carpocapsae (25 ji/ml, 50 ji/ml, 100 ji/ml, 200 ji/ml, 400 ji/ml, dan 800 ji/ml) dengan 5 kali pengulangan. Pengujian patogenisitas dilakukan terhadap C. curvignathus kasta pekerja. Kemampuan patogenisitas S. carpocapsae diukur berdasarkan mortalitas, jumlah S. carpocapsae yang keluar, periode letal dan virulensi. Hasil pengujian menunjukan bahwa S. carpocapsae mampu menyebabkan mortalitas sebesar 100% pada perlakuan 800 ji/ml dalam 96 jam setelah inokulasi. Priode letal yang dihasilkan sebesar 40,68 dan Virulensi sebesar 0,024. Jumlah S. carpocapsae yang dihasilkan tidak berbeda nyata antara satu perlakuan dengan perlakuan lainnya dikarenakan C. curvignathus merupakan serangga uji yang memiliki tubuh ukuran kecil antara 4,5-5,0 mm. Sehingga tiap perlakuan konsentrasi S. carpocapsae yang diinokulasikan memiliki kapasitas ruang yang  sama untuk perkembangannya.Kata kunci : Inokulasi, Mortalitas, Priode letal, Virulensi
KARAKTERISASI TRICHODERMA HARZIANUM ASAL LAHAN GAMBUT SEBAGAI AGENS ANTAGONIS TERHADAP PENYEBAB PENYAKIT BUSUK PANGKAL BATANG SAWIT SECARA IN VITRO
Authors: Nandung Elsy , Suswanto Iman , Ramadhan Tris Haris
Published: December 2018

T. harzianum  merupakan agen antagonis yang digunakan untuk pengendalian hayati. Penelitian ini bertujuan mengetahui keragaman cendawan dari beberapa jenis vegetasi di lahan gambut,  mengetahui kemampuan daya hambat dan sifat-sifat lain T. harzianum penentuan sifat yang dapat digunakan sebagai penciri T. harzianum sebagai agens pengendali busuk pangkal batang, dan kemampuan mendegradasi kitin sebagai salah satu komponen dinding sel Ganoderma spp.. Pengujian ini dilakukan melalui hasil isolasi T. harzianum dari beberapa areal, inkubasi menggunakan media PDA kemudian dilakukan pencirian berdasarkan uji antagonis, uji pertumbuhan, morfologi dan mekanisme penghambatan, uji kitinase dilakukan dengan menginkubasi cendawan  T. harzianum  pada media kolodial kitin diamati zona bening setiap hari.   Keragaman cendawan dari berbagai wilayah relatif sama. Agen pengendali Ganoderma spp. seperti busuk pangkal batang banyak ditemukan pada wilayah yang ditumbuhi cabai dan hutan belukar. Pencirian T. harzianum terbaik berdasarkan tingginya daya hambat, kerapatan spora dan mekanisme penghambatan. Mekanisme penghambatan bersifat hiperparasit mampu menekan pertumbuhan Ganoderma spp. melalui degradasi kitin.Kata kunci : Busuk Pangkal Batang, Gambut, Pencirian T. harzianum, Sawit
ANALISIS TINGKAT PENDAPATAN DAN KESEJAHTERAAN PETANI KELAPA KELAPA SAWIT DI DESA MERARAI SATU KECAMATAN SUNGAI TEBELIAN KABUPATEN SINTANG
Authors: Firman Firman , Suyatno Adi , Kurniati Dewi
Published: December 2018

Kelapa kelapa sawit merupakan salah satu komoditas ekspor non migas yang mempunyai nilai ekonomi dalam perdagangan nasional maupun internasional. Pesatnya perkembangan perkebunan kelapa kelapa sawit di Kalimantan Barat tidak dipungkiri turut mendongkrak perekonomian di Kalimantan Barat. PT. SDK III (SDK III) yang beroperasi di Desa Merarai Satu kecamatan Sungai Tebelian Kabupaten Sintang. PT. SDK III adalah perusahaan yang  mengacu pada pola pengembangan perkebunan inti rakyat dikaitkan dengan program pengembangan transmigrasi (PIR-Trans). Tujuan dari penelitian ini adalah untuk mengetahui Tingkat pendaptan dan kesejahteraan petani kelapa kelapa sawit di Desa Merarai Satu Kecamatan Sungai Tebelian Kabupaten Sintang. Dari perhitungan uji t tingkat pendapatan petani kelapa kelapa sawit setelah lunas kredit lebih tinggi dibandingkan sebelum lunas kredit petani kelapa kelapa sawit terhadap PT. SDK III hal ini dapat dilihat pada uji-t diperoleh t hitung > t tabel yaitu sebesar 12,245 dan t tabel pada 0,05 sebesar 2,708 yang artinya tolak H0  dan terima H1.Tingkat kesejahteraan petani kelapa kelapa sawit sebelum dan setelah lunas kredit diukur dengan menggunakan indikator tingkat kesejahteraan setara beras (Sajogyo)  dimana sebelum lunas kredit petani kelapa kelapa sawit di Desa Merarai Satu termasuk dalam kriteria cukup dimana terdapat 32 KK atau sebesar 80% KK petani kelapa kelapa sawit sedangkan setelah lunas kredit petani kelapa kelapa sawit Di Desa Merarai Satu termasuk dalam kriteria kaya yaitu sebanyak 28 kk atau 70% petani kelapa kelapa sawit. Dari pendapatan setara beras  dapat disimpulkan bahwa petani kelapa kelapa sawit di Desa Merarai Satu dapat dikatakan sejahtera.Kata kunci : Tingkat Pendapatan, Kesejahteraan, Petani Kelapa Kelapa sawit
PREDIKSI EROSI DENGAN METODE USLE DI PERKEBUNAN KELAPA SAWIT PTPN XIII GUNUNG MELIAU KECAMATAN MELIAU KABUPATEN SANGGAU
Authors: Liastuti Putri , Chandra Tino Orciny , Widiarso Bambang
Published: December 2018

Lokasi penelitian yakni di Afdeling 3 PTPN XIII Gunung Meliau Kecamatan Meliau Kabupaten Sanggau. Penelitian ini bertujuan untuk memprediksi besarnya erosi yang terjadi dan besarnya erosi yang masih dapat ditoleransi. Metode yang digunakan dalam penelitian ini dihitung menggunakan metode USLE dengan mengetahui nilai dari faktor R, K, L, S, C dan P yang merupakan faktor penyebab terjadinya erosi pada areal perkebunan kelapa sawit di lokasi penelitian. Selanjutnya nilai erosi yang dapat ditoleransi dibandingkan dengan nilai prediksi erosi. Setelah dibandingkan nilai prediksi erosi dengan nilai erosi yang dapat ditoleransi, maka perlu dilakukan tindakan konservasi yang direkomendasikan.  Hasil penelitian ini didapatkan bahwa prediksi laju erosi (A) mencapai 140,16 sampai 9737,28 ton/ha/tahun. Nilai prediksi erosi yang dapat ditoleransi (ETOL) berkisar antara 48,22 sampai 32,13 ton/ha/tahun. Pada lahan Ult4 nilai (A) lebih besar dari nilai Etol dengan tingkat bahaya erosi sedang, sedangkan pada lahan Ult18, Ult24, Ult36 nilai (A) lebih besar dari nilai Etol dengan tingkat bahaya erosi sangat berat. Perencanaan dan penanggulangan bahaya erosi yang sesuai adalah pembuatan teras bangku kontruksi baik. Khusus untuk lahan Ult4 dan Ult18 dapat direkomendasikan juga dengan penanaman LCC dan pembuatan teras kontruksi sedang.Katakunci : Prediksi erosi USLE, Kelapa sawit, Perkebunan PTPN XIII
IDENTIFIKASI SIFAT FISIKA TANAH ULTISOLS PADA DUA TIPE PENGGUNAAN LAHAN DI DESA BETENUNG KECAMATAN NANGA TAYAP KABUPATEN KETAPANG
Authors: Meli Veromika , Sagiman Saeri , Gafur Sutarman
Published: December 2018

Penelitian bertujuan membandingkan sifat fisika tanah pada kebun karet dan kelapa sawit di Desa Betenung Kecamatan Nanga Tayap Kabupaten Ketapang. Sampel tanah diambil secara diagonal dengan mengambil sampel tanah utuh, sampel tanah agregat utuh dan contoh tanah terganggu. Sampel tanah di ambil pada kebun karet dan kelapa sawit dengan kedalaman 0-30 cm dan 30-60 cm. Hasil penelitan menunjukkan profil warna tanah pada kebun karet terdapat dua lapisan warna tanah yaitu 7,5YR 3/3 coklat gelap dan 7,5YR 6/8 kuning kemerahan. Profil warna tanah pada perkebunan kelapa sawit terdapat dua lapisan warna tanah, lapisan pertama 7,5YR 4/6 coklat gelap, lapisan kedua 7,5YR 6/8 kuning kemerahan. Struktur tanah kebun karet lapisan I remah, lapisan II dan III gumpal membulat. Struktur pada kebun kelapa sawit lapisan I remah, lapisan II gumpal bersudut, lapisan III gumpal membulat. Tekstur tanah kebun karet kedalaman 0-30 cm dan 30-60 cm termasuk lempung dan lempung berliat, pada kebun kelapa sawit kedalaman 0-30 cm dan 30-60 cm termasuk lempung liat berdebu. Hasil uji t bobot isi tanah kebun karet dan kelapa sawit kedalaman 0-30cm berbeda tidak nyata, kedalaman 30-60 cm berbeda nyata. Hasil uji t kadar air kapasitas lapangan kebun karet dan kelapa sawit kedalaman 0-30 cm dan 30-60cm berbeda tidak nyata. Hasil uji t porositas tanah kebun karet dan kelapa sawit kedalaman 0-30 dan 30-60 cm berbeda tidak nyata. Hasil uji t permeabilitas tanah kebun karet dan kelapa sawit kedalaman 0-30 cm dan 30-60 cm berbeda tidak nyata. Kemantapan agregat tanah lebih tinggi pada kebun kelapa sawit dibandingkan hutan karet, baik kedalaman 0-30 cm maupun 30-60 cm. Bahan organik pada kebun karet dan kelapa sawit tergolong rendah, baik pada kedalaman 0-30 cm maupun 30-60 cm, N-total rendah, dan C/N rasio rendah serta reaksi tanah (pH) masamKata kunci : Ultisols, Sifat Fisika Tanah, Kebun Karet dan Kelapa Sawit.
PENGARUH ASAP CAIR TEMPURUNG KELAPA TERHADAP P. palmivora PENYEBAB PENYAKIT BUSUK BUAH PADA KAKAO
Authors: Yunita Yunita , Suswanto Iman , Sarbino Sarbino
Published: December 2018

Penyakit busuk buah yang disebabkan oleh P.palmivora merupakan salah satu penyakit penting pada tanaman kakao kerena menyebabkan kerugian cukup besar pada hasil panen. Salah satu cara pengendalian busuk buah menggunakan asap cair tempurung kelapa. Penelitian ini bertujuan memperoleh konsentrasi asap cair untuk menekan aktivitas P.pamivora. Penelitian berlangsung selama tiga bulan di Laboratorium Penyakit Tanaman Fakultas Pertanian Universitas Tanjungpura. Metode yang digunakan adalah Rancangan Acak Lengkap (RAL) dengan 6 perlakuan 0%, 5%, 10%, 20%, 40% dan fungisida berbahan aktif mancozeb 80% di ulang 3 kali. Parameter yang diamati adalah jumlah bercak dan panjang bercak, pengamatan dimulai pada hari kelima setelah inkubasi. Hasil penelitian menunjukan bahwa pengendalian penyakit busuk buah menggunakan cuka kayu efektif pada konsentrasi 5% dan 10% yang mampu menghambat aktivitas P.palmivora.Kata Kunci: Buah kakao, asap cair tempurung kelapa,  P.palmivora
Tolerance of microalgae Dunaliella salina and Phaeodactylum tricornutum to various concentrations of selenium in the medium
Authors: Aizdaicher N. A. , Markina Zh. V.
Published: December 2018

Cell number dynamics and growth rate of microalgaeDunaliella salina(Chlorophyta) andPhaeodactylum tricornutum(Bacillariophyta) are considered in dependence on selenium concentration in the medium. The concentrations 0.01, 0.10, and 0,50 mg/l were tested. Onetime addition of selenium did not inﬂuence on the cell number and morphology ofD. salina. Under repeatable addition of selenium (every 2 days), reliable differences in the cells number were detected for the concentration 0.10 mg/l only, but the concentrations 0.01 and 0.50 mg/l did not make any effect on the cells different from the control. Under frequent repeatable addition of selenium (every day), the concentration 0.50 mg/l caused a visible decreasing of the cell number in compare with the control sample — after 6 days the cells started to decay, settled to the ﬂask bottom and aggregated, the suspension color turned to yellowish. Reaction of diatomPhaeodactylum tricornurumwas more complicated. Its cell number increased signifcantly against the control under both one-time addition of selenium in the concentration of 0.10 and 0.50 mg/l or the repeatable addition in every 2 days in the concentration 0.01 and 0.10 mg/l. But more frequent (every day) addition of selenium in the concentration 0.50 mg/l caused inhibition of the cells growth and decreasing of their number against the control sample — after 4 days the cells adhesion to the ﬂask bottom was detected, apparently because of their metabolism alteration.
CALCULATED RESEARCH OF INFLUENCE OF HELICOPTER MAIN ROTORS GEOMETRY ON THE EFFICIENCY IN HOVER MODE BASED ON THE NONLINEAR VORTEX MODEL
Authors: Ignatkin Yurii M. , Makeev Pavel V. , Shomov Alexander I.
Published: December 2018

The efficiency of the helicopter main rotor in the hover mode is very important, because this mode essentially determines the performance characteristics of the helicopter. A feature of the helicopter rotor aerodynamics is a significant inductive blade influence that highly defines its aerodynamic characteristics. The problem of the influence of the blade twist and spatial geometric layout of the main rotor on its aerodynamic characteristics in the hover mode for a fixed value of the rotor solidity has been considered in this article. As a criterion of efficiency of the rotor in the hover mode relative efficiency (FoM – Figure of Merit) is used. The results are obtained by numerical simulation based on the nonlinear vortex blade model of the rotor, developed at the Helicopter Design Chair of the MAI. The model allows taking into account a complicated spatial shape of the free vortex path of the rotor blades that determines their inductive interaction. As the example of a four-blade main rotor with rectangular blades in plan, the influence of the value of the blades twist on the efficiency in the hover mode is studied. For different values of the rotor thrust, the values and ranges of the blade twist angles are determined, providing the maximum positive effect of the efficiency increase in hovering. For a fixed value of the blade twist, the rotor solidity, and the same operating conditions, the effect of various schemes and configurations of rotor on its efficiency in hover mode is studied. A single rotor with a different number of blades (from 2 to 6), an X-shaped rotor, coaxial rotor and rotor with crossed blades type "synchropter" are considered. The values of the efficiency increase in hovering depending on the rotor layout in comparison with the two-blade rotor are obtained. The comparative analysis of inductive velocities and streamlines for the "synchropter" rotor scheme, coaxial rotor scheme and its equivalent single rotor scheme is presented. The obtained results can be useful at the stage of preliminary design of vertically taking-off aircraft when selecting the parameters of their main rotor system.
O ESTADO DA ARTE NA METODOLOGIA DA PESQUISA CIENTÍFICA NA FORMAÇÃO DE PROFESSORES DE BIOLOGIA NO BRASIL: UMA VISÃO BASEADA EM ANÁLISE DE TESES
Authors: Costa Rúbia Darivanda da Silva , Kalhil Josefina Barrera , Vilas Boas Terezinha de Jesus Reis
Published: December 2018

O artigo teve como finalidade investigar os paradigmas utilizados na produção acadêmica expressa em teses sobre a Formação de Professores de Biologia, defendidas em programas de pós-graduação de Educação e/ou Ensino de Ciências existentes no Brasil no período 2007-2016. Foram examinados 19 documentos. Acredita-se que este artigo poderá motivar reflexões sobre a formação de professores de Biologia, no âmbito do cenário nacional, além de permitir a análise e compreensão de como estão sendo aplicadas as metodologias para a coleta e estudo de dados das pesquisas desenvolvidas. O trabalho foi norteado pela identificação das abordagens metodológicas que foram aplicadas nos trabalhos. Nos resultados foram apresentados alguns termos utilizados na pesquisa científica para designar paradigma, além da identificação dos paradigmas mais utilizados pelos pesquisadores.
ANÁLISE INTERDISCIPLINAR DAS ESTÓRIAS DO LIVRO “ESPORTES DE AVENTURA” NUMA PERSPECTIVA STEAM
Authors: Viana Dandara Lima , Araujo Cleusa Suzana Oliveira de , Cavalcante Daniela dos Santos
Published: December 2018

Este artigo foi desenvolvido a partir da análise do livro “Esporte de Aventura”, componente da coleção “Almanaque do sítio” que contém vários livros com diferentes temáticas. O livro é composto por estórias que se passam no cenário do famoso Sítio do Pica Pau Amarelo, uma composição do autor brasileiro Monteiro Lobato, que foi adaptada para televisão com uma série infanto-juvenil. Esta pesquisa se enquadra predominantemente como pesquisa qualitativa, no que concerne ao interesse pela ênfase na qualidade dos fenômenos educacionais, no que tange aos fenômenos humanos, à sua multiplicidade e a suas interconexões. A proposta desta análise é identificar como trabalhar conjuntamente diferentes disciplinas do 6º ao 9º ano do ensino fundamental, a partir das estórias do livro, em uma proposta interdisciplinar, mostrando articulação entre as diferentes disciplinas numa abordagem STEAM – Ciência, Tecnologia, Engenharia, Artes e Matemática, bem como identificar os conteúdos que o professor pode desenvolver na sala juntamente com propostas de atividades para esse conteúdo. Através dos resultados obtidos com a pesquisa pode-se constatar que com apenas esse livro é possível fazer no mínimo 10 (dez) atividades interdisciplinares com os alunos, abordando as disciplinas de artes, matemática, ciências, educação física, história, geografia, física, língua portuguesa e inglês. Ainda é possível explorar muito mais do livro.
PERCEPÇÃO: ARTICULAÇÃO DAS PLANTAS MEDICINAIS AO ENSINO DE CIÊNCIAS
Authors: Brandão Gelciane da Silva , Aguiar José Vicente de Souza , Vasconcelos Naiara Batista de
Published: December 2018

Este artigo foi produzido a partir da disciplina “Tópicos Filosófico e Didático do Ensino de Ciências” do mestrado em Educação em Ciências, da Universidade do Estado do Amazonas /UEA. O objetivo geral foi um exercício fenomenológico no mercado Municipal Adolpho Lisboa na cidade de Manaus/AM. O problema de pesquisa visou responder: á no mercado elemento que possa ser articulado ao Ensino de Ciências? A pesquisa qualitativa nos possibilitou a descrição interpretativa dos dados, tendo como base o método fenomenológico de (MERLEAU-PONTY, 1999). No referencial teórico destacamos como a legislação brasileira destaca o reconhecimento das plantas medicinais, e tessituras sobre Ensino de Ciências. Conclui-se que as plantas medicinais podem ser articuladas ao Ensino de Ciências a partir da temática da Educação Ambiental.