bluuebunny/crossref_metadata_2025 huggingface dataset:
HIỆU QUẢ BỔ SUNG ĐA VI CHẤT LÊN THỂ LỰC CỦA NỮ VỊ THÀNH NIÊN TRUNG HỌC PHỔ THÔNG MIỀN NÚI TỈNH THANH HÓA NĂM 2019 - 2020
Authors: Lưu Kim Lệ Hằng , Trần Thúy Nga , Nguyễn Thị Lan Phương , Nguyễn Xuân Hiệp
Published: June 2022

Nghiên cứu can thiệp cộng đồng có đối chứng, mù kép, đánh giá hiệu quả sử dụng viên đa vichất dinh dưỡng(ĐVCDD) hàng tuần lên tình trạng thể lực của nữ vị thành niên trung học phổthông miền núi tỉnh Thanh Hóa năm 2019 - 2020. Tổng số 240 nữ học sinh tham gia can thiệpđược chia ngẫu nhiên thành 2 nhóm, nhóm can thiệp uống viên ĐVCDD bổ sung 23 loại vitamin và chất khoáng trong đó sắt (60 mg), acid folic (2,8 mg), kẽm (10,8 mg), vitamin A (550 mcg), và 19 loại vi chất khác theo khuyến nghị của WHO 2011, nhóm chứng uống viên giả dược, 1 viên/tuần trong 9 tháng. Thể lực của nữ học sinh trước và sau can thiệp được đánh giá theo tiêu chuẩn của Bộ Giáo dục và Đào tạo. Kết quả sau 9 tháng can thiệp bổ sung ĐVCDD, sức mạnh, sức bền của nữ vị thành niên được gia tăng đáng kể, trình độ thể lực của nhóm can thiệp xếp loại đạt 67,5% và tốt 20,0% cao hơn so với nhóm chứng có tỷ lệ đạt 36,7% và tốt 6,7%. Ở nhóm can thiệp, tỷ lệ xếp loại thể lực không đạt giảm 53,6% so với nhóm chứng (p<0,001).
NGHIÊN CỨU CHẾ BIẾN NƯỚC UỐNG TỪ HOA ĐẬU BIẾC VÀ HẠT CHIA
Authors: Ung Minh Anh Thư , Trần Xuân Hiển , Nguyễn Tấn Hùng
Published: June 2022

Hoa đậu biếc (Clitoria ternatean), hay lam hồ điệp là một loại hoa chứa hợp chất màu tự nhiêncó các hợp chất chống oxy hóa với giá trị thương phẩm cao. Hạt chia (Salvia hispanica) chứaacid béo omega-3, protein, chất xơ và cũng là loại thực vật chứa các chất chống oxy hóa cao.Nghiên cứu được thực hiện nhằm khảo sát một số yếu tố như: nhiệt độ (80-90oC) và thời giantrích ly (5-15 phút); pH (6-7) và độ Brix (8-12); nhiệt độ (85-95oC) và thời gian thanh trùng (5-15 phút) đến chất lượng sản phẩm nước hoa đậu biếc hạt chia. Kết quả cho thấy, hoa đậu biếckhô được trích ly trong nước ở 85oC trong 10 phút cho sản phẩm có màu sắc đặc trưng; điềuchỉnh về pH 6,5 và hàm lượng chất khô 10 (oBrix) cho sản phẩm có giá trị cảm quan cao và đạtyêu cầu về vi sinh khi thanh trùng ở 95oC trong 10 phút. Đồ uống này là sản phẩm tự nhiên vàcó thể là một thay thế tốt hơn cho đồ uống tổng hợp.
HIỆU QUẢ BỔ SUNG PHỐI HỢP SẮT VÀ KẼM ĐẾN TÌNH TRẠNG THIẾU MÁU, THIẾU SẮT, THIẾU KẼM TRÊN TRẺ 1-3 TUỔI SUY DINH DƯỠNG THẤP CÒI
Authors: Phan Tiến Hoàng , Nguyễn Quang Dũng , Trần Thúy Nga , Nguyễn Thị Lan Phương , Lê Danh Tuyên
Published: June 2022

Mục tiêu: Đánh giá hiệu quả của việc bổ sung phối hợp sắt và kẽm lên tình trạng thiếu máu, thiếu sắt, thiếu kẽm trên trẻ suy dinh dưỡng (SDD) thấp còi 1- 3  tuổi. Phương pháp: Nghiên cứu can thiệp cộng đồng có đối chứng. Đối tượng: trẻ suy dinh dưỡng (SDD) thấp còi 1- 3 tuổi ở Nhóm can thiệp bổ sung sắt và kẽm và nhóm chứng không bổ sung sắt, kẽm. Kết quả: Sau 6 tháng can thiệp ở nhóm chứng và nhóm can thiệp Hb (g/L) tăng 3,2 ± 12,7 và 2,5 ± 14,9; Ferritin (μg/L) tăng 16,1 ± 31,3 và 24,6 ± 37,9; kẽm huyết thanh (μmol/L) tăng 0,32 ± 2,52 và 1,31 ± 3,30. Thay đổi tỷ lệ thiếu máu, thiếu sắt, thiếu kẽm sau 6 tháng  can thiệp ở nhóm chứng và nhóm can thiệp tương ứng như sau: thiếu máu tăng 3% và giảm 6,2%; thiếu sắt giảm 12,1% và 19,6%; thiếu kẽm giảm 1 % và 21,7%. Kết luận: Sử dụng sản phẩm Suppy bổ sung sắt kẽm trong 6 tháng trên trẻ SDD thấp còi 1-3 tuổi có hiệu quả tăng nồng độ Ferritin, kẽm huyết thanh và giảm tỷ lệ thiếu máu, thiếu sắt, thiếu kẽm hơn so với sử dụng sản phẩm Suppy không bổ sung vi chất dinh dưỡng sắt và kẽm.
Đặc điểm nhân trắc dinh dưỡng của người bệnh phong tàn tật tại Bệnh viện Da liễu Thái Bình năm 2020
Authors: Phạm Văn Hùng , Trương Hồng Sơn , Ninh Thị Nhung , Phạm Thị Kiều Chinh
Published: June 2022

Nghiên cứu dịch tễ học cắt ngang được thực hiện tại Bệnh viện Da liễu Thái Bình năm 2020 trên 112 bệnh nhân tuổi từ 58 đến dưới 90 tuổi, để đánh giá tình trạng dinh dưỡng (TTDD) của bệnh nhân phong qua nhân trắc dinh dưỡng và một số chỉ số hóa sinh, huyết học. Kết quả cho thấy có 93,8% người mắc bệnh trên 20 năm, 6,2% người mắc bệnh từ 10 đến 20 năm. Gần 50% đối tượng có THA trong đó THA độ 1 là 23,2%, độ 2 là 19,6% và độ 3 là 3,6%. Tỷ lệ thiếu năng lượng trường diễn (TNLTD) chiếm 43,8; tăng cholesterol là 33,9%, tăng triglycerid là 41,1%; tỷ lệ thiếu máu là 17%, tỷ lệ protein toàn phần thấp là 21,4% và tỷ lệ albumin thấp 30,4%. Tình trạng khuyết tật ở bệnh nhân phong làm cho tỷ lệ thiếu dinh dưỡng có xu hướng gia tăng hơn so với các nhóm bệnh tật khác.
THỪA CÂN - BÉO PHÌ VÀ CẤU TRÚC CƠ THỂ CỦA NỮ VIÊN CHỨC TRƯỜNG ĐẠI HỌC Y KHOA PHẠM NGỌC THẠCH ĐÁNH GIÁ BẰNG PHƯƠNG PHÁP PHÂN TÍCH KHÁNG TRỞ ĐIỆN SINH HỌC NĂM 2020
Authors: Dương Đông Nhật , Trần Mỹ Nhung , Trương Xuân Bích , Đoàn ThịKim Thoa , Trần Quốc Cường
Published: June 2022

Nhằm khảo sát thực trạng thừa cân - béo phì của nữ viên chức tại Trường Đại học Y Khoa Phạm Ngọc Thạch, 220 nữ viên chức của trường có độ tuổi từ 20 đến 59 tuổi đã được đo các chỉ số nhân trắc và đánh giá thành phần cơ thể bằng máy phân tích kháng trở điện sinh học Tanita SC - 331S. Kết quả: Tỷ lệ thừa cân – béo phì (BMI ≥ 23) và béo phì (BMI ≥ 25) lần lượt là 27,3% và 13,6%. Tỷ lệ béo phì theo phần trăm mỡ cơ thể (>35%) là 14,1%. Phần trăm mỡ cơ thể trung bình, khối mỡ, mỡ nội tạng và tuổi chuyển hóa tăng dần theo nhóm tuổi với sự khác biệt có ý nghĩa thống kê. Kết luận: Tỷ lệ thừa cân - béo phì của nữ viên chức tại Trường Đại học Y Khoa Phạm Ngọc Thạch là tương đối cao. Tỷ lệ béo phì khi phân loại theo giá trị BMI và khi phân loại theo phần trăm mỡ cơ thể là gần bằng nhau (13,6% và  14,1%) ở điểm cắt BMI 25 kg/m2 và tỷ lệ mỡ 35%.
NGHIÊN CỨU TÌNH TRẠNG DINH DƯỠNG Ở TRẺ EM TẠI MỘT SỐ TRƯỜNG MẦM NON CÔNG LẬP THUỘC QUẬN HẢI CHÂU THÀNH PHỐ ĐÀ NẴNG NĂM 2019
Authors: Huỳnh Thị Minh Giang , Trần Thị Diệp Hà
Published: June 2022

Các bệnh liên quan đến dinh dưỡng rất đa dạng và xuất hiện ở nhiều độ tuổi khác nhau, trong đó trẻ em là một trong những đối tượng có nguy cơ cao. Nhiều nghiên cứu đã chứng minh có mối liên quan giữa tình trạng dinh dưỡng khi còn nhỏ và sự phát triển thể chất, tinh thần, khả năng lao động và nguy cơ mắc các bệnh không lây nhiễm như tim mạch, huyết áp, ung thư khi lớn lên. Đề tài nghiên cứu với mục tiêu mô tả tình trạng dinh dưỡng ở trẻ em tại một số trường mầm non công tập thuộc quận Hải Châu, thành phố Đà Nẵng. Thiết kế điều tra cắt ngang, chọn mẫu chùm 326 trẻ từ 2 - 5 tuổi tại 02 trường mầm non công lập đạt chuẩn tại quận Hải Châu, thành phố Đà Nẵng. Nghiên cứu sử dụng 3 chỉ số gồm cân nặng theo tuổi, chiều cao theo tuổi và BMI theo tuổi đánh giá tình trạng dinh dưỡng cho trẻ. Kết quả cho thấy: Có 3,1% trẻ suy dinh dưỡng nhẹ cân; 17,2% thừa cân - béo phì; 13,8% trẻ suy dinh dưỡng thấp còi. Dựa vào chỉ số BMI theo tuổi, có 9,5% trẻ suy dinh dưỡng gầy còm; 20,9% thừa cân - béo phì.
Tình trạng dinh dưỡng của học sinh Trường trung học cơ cở Chiềng An, thành phố Sơn La năm 2020
Authors: Tong Thị Thanh , Nguyễn Thị Thanh , Lò Thị Kiểu
Published: June 2022

Nghiên cứu mô tả cắt ngang được tiến hành trên 320 học sinh trường trung học cơ sở Chiềng An, thành phố Sơn La năm 2019 – 2020. Mục tiêu: Đánh giá tình trạng dinh dưỡng (TTDD) của học sinh trung học cơ sở. Phương pháp: Sử dụng phương pháp nhân trắc đánh giá TTDD theo chỉ số Z-Score BMI theo tuổi. Kết quả: Tỷ lệ suy dinh dưỡng (SDD) (Z-Score BMI <-2) khá thấp, tỷ lệ SDD chung là 3,4%; nam (1,8%), nữ (5,1%); cao nhất ở nhóm 11 tuổi (8%), không có ở nhóm 14 tuổi (0%). Tuy nhiên, tỷ lệ thừa cân béo phì (Z-Score BMI >1 là 14,7%; nam (14,6%) nữ (14,7%); cao nhất ở nhóm 14 tuổi (44,3%). Cần quan tâm đến tỷ lệ thừa cân béo phì (TCBP) tại trường trung học cơ sở tại thành phố Sơn La.
Đặc điểm khẩu phần của người bệnh phong tàn tật được nuôi dưỡng tại Bệnh viện Da liễu Thái Bình năm 2020
Authors: Phạm Văn Hùng , Trương Hồng Sơn , Ninh Thị Nhung , Phạm Thị Kiều Chinh
Published: June 2022

Nghiên cứu dịch tễ học cắt ngang được thực hiện tại Bệnh viện Da liễu Thái Bình năm 2020 để đánh giá khẩu phần của bệnh nhân phong bằng phương pháp hỏi ghi 24 giờ.

Khẩu phần của 112 bệnh nhân được đưa vào phân tích mức độ tiêu thụ các chất dinh dưỡng, vitamin và khoáng chất và tính cân đối của khẩu phần. Kết quả cho thấy khẩu phần của người bệnh mới đáp ứng được khoảng 77,7% nhu cầu năng lượng, 78,6% nhu cầu protein; 88,4% nhu cầu lipid và 87,5% nhu cầu glucid theo nhu cầu dinh dưỡng khuyến nghị cho người Việt Nam. Đồng thời tỷ lệ đạt về một số chất khoáng và vitamin trong khẩu phần của người bệnh phong rất thấp, đặc biệt là canxi rất thấp, tỷ lệ canxi và phospho không phù hợp chỉ đạt 0,43, thấp hơn rất nhiều so với khuyến nghị. Cần phân chia đối tượng người bệnh phong theo tình trạng dinh dưỡng (TTDD) để xây dựng thực đơn phù hợp từng nhóm đối tượng có hiệu quả hơn và từng bước cải thiện số lượng, chất lượng bữa ăn.
Bibliotherapeutische Ansätze in einem interdisziplinären Unterricht
Authors: Holtmann Miriam
Published: June 2022

In how far can reading a certain novel help us to solve problems that are not dealt with in the plot of its story but in our own lives? This study not only offers current findings and discourses from the variety of research culture concerning the relevance of reading, but they are also described and related to bibliotherapeutic and interdisciplinary lessons. Apart from the profound importance of actively dealing with a novel’s content in terms of one’s own biography, the necessity of developing inner imagery and imagination itself becomes the focal point of this work. These aspects are reinforced by current research results from the field of cognitive psychology, which examines the measurable effect of literature in the human brain.
An Environmental Investment Decision Face to Face With Two Competing Systems: Sanitation and Healthcare
Authors: Fehr Manfred , Soares Mara Alves
Published: June 2022

This study develops an economic relationship between public health and sanitation with the aim to provide arguments for environmental decisions on the most efficient allocation of available funds. The analysis addresses the specific case of illnesses originating from lack of sanitation. With data from a sample town in Brazil, it produces cost values for the competing systems of medical care and sewage collection, both of which being candidates to combat illnesses. The calculations assume that the existence of sanitary coverage is sufficient to eliminate illnesses, and are carried out with relative monetary units in order to make the procedure generally applicable. An illustrative numerical example shows, with the aid of opportunity cost accounting, how the relationship can be presented on a yearly basis to overcome the difficulty of comparing perpetual medical to sporadic sanitation expenditures. In conclusion, the proactive measure of investing in sanitation is shown to be economically preferable to the reactive provision of medical care for the kind of illnesses addressed.
Ancient Aliens, Modern Fears: Anti-scientific, Anti-evolutionary, Racist, and Xenophobic Motifs in Robert Charroux
Authors: Bigliardi Stefano ,   Academic Publishing
Published: June 2022

The French author Robert Charroux (1909–1978) contributed to the popular discourse about alien visits to earth in the remote past, that he advanced in voluminous books replete with narratives of anomalous “facts.” According to Charroux, humanity is divided in “races” whose existence is explained in reference to greater or lesser “genetic” similarity to the “ancient aliens,” as well as to radiation that genetically modified humans on the occasions of major catastrophes (natural as well as human-induced). Additionally, he was convinced that a factor in humanity’s decadence was its attachment to technology, that he regarded as detrimental in various ways; science, in his opinion, was overrated, a case in point being the theory of evolution. Extending the analysis of Charroux’s work offered by scholars like Wiktor Stoczkowski and Damien Karbovnik, I scrutinize Charroux’s books, reconstructing his ambiguous attitude towards science, his criticism of evolution, his racist theories, and his xenophobic worldview.
Preservice teachers' beliefs about the benefits and drawbacks of collaborative learning
Authors: Kovačević Zorica
Published: June 2022

Contemporary educational reforms across the world recognize collaborative learning as a key educational competency. In the last decade the question of the importance of collaborative learning has been extended to include the context of higher education, particularly preservice teacher education, with the aim of raising the level of expectations for the use of this type of learning in practice. Preservice teachers' positive beliefs about collaborative learning, developed during their university education, can be crucial since they indicate their predisposition to use this type of learning in their own practice. This paper presents the results of a study which aimed to explore preservice teachers' beliefs about the benefits and drawbacks of collaborative learning. In the study, the descriptive method and scaling as a research technique were employed. The presented results suggest a certain link between the frequency of engagement in collaborative learning during university studies and preservice teachers' beliefs about the benefits and drawbacks of this type of learning, and highlight the importance of experiential knowledge which enables preservice teachers to make the transition from learning about collaborative learning to learning through collaborative learning, and to coordinate what they see and do during their education with what they see and do in their teaching practice. collaborative learning, preservice teacher education, preservice teachers, educational beliefs. Abstract Keywords
Difficulties in distance education at a University in Algeria: The perspective of financial management students
Authors: Seif Eddine , Touidjeni Zinelaabidine
Published: June 2022

Distance education is an educational approach adopted by many universities, but its use as an alternative to traditional education has posed a real challenge to some universities around the world. The purpose of this study was to identify the difficulties encountered by students in a distance education system, and to this end, we relied on the descriptive approach using a questionnaire as an instrument for data collection, which was distributed to 117 financial management students from Constantine 2 University in Algeria. We arrived at a set of conclusions, the most important of which are: students in this type of education face a variety of technical, financial, pedagogical, and psychological difficulties; there is no difference in student responses based on gender, distance education digital devices, or computer skills level.
The relationship between the physical abilities of eighth-grade students and sport-specific skills in physical education
Authors: Milenković Dejan
Published: June 2022

In order to achieve higher-quality physical education, students should be involved in a wide range of sports activities that improve the level of their physical abilities and basic motor skills, in view of the fact that there is a positive transfer between sport-specific and basic motor skills, whose development depends to a significant extent on the level of physical abilities. Our study sought to establish the relationship between physical abilities and sport-specific skills in eighth-grade primary school students. Moreover, it aimed to identify sex-dependent differences in the observed variables. Sixty eighth-grade students participated in the study (boys n=28, girls n=32). Students' physical ability levels were assessed with a battery of tests (modified agility T-test, Illinois agility run test, 20m sprint test, medicine ball chest throw from a kneeling position, 10x5m sprint run), while for sport-specific skills a circuit of sports games was used (technical elements of football and basketball). In addition to descriptive statistics, a unifactorial analysis of variance was used to determine the effects of sex on the results for physical abilities and sport-specific motor skills, as well as the Pearson correlation coefficient for the relationship between physical abilities and sport-specific skills observed across the entire sample as well as according to sex. Results suggest a significant correlation between the areas of physical abilities and sport-specific skills in eighth-grade primary school students. As regards differences in results according to sex, they are significant across all variables.
A Risk-Based Evaluation Ice-Strengthened Hull Structures
Authors: Kujala Pentti , Ehlers Sören
Published: June 2022

Current ice class rules may design a structure that can undergo some plastic deformations during their design life. The amount of allowable plastic deformations is however not clearly defined in these ice class rules so as the critical deformation limit that requires repair. It is possible to increase the scantlings until no plastic deformations occur during the ship’s lifetime. This will cause a high investment cost at the construction phase but no repair cost during the design life. Another possibility is to allow some local plasticity requiring repair work at specified nominal frequencies during the ships’ lifetime, which causes smaller investments, but higher maintenance costs. The optimum between these two extremes is searched in this paper and the procedure on how to identify such concept will be described.
Ice Crushing Pressures for Arctic Structure Design
Authors: Spencer Paul A.
Published: June 2022

This paper describes a reanalysis of the data used to support the ISO 19906 deterministic pressure recommendations for Ice Loads on Arctic Structures. The reanalysis using quantile regression generated calibrated ice crushing pressure probability distributions. Using an interaction model based on High Pressure Zones, new recommendations are presented for Local and Global pressures for a wide range of ice thickness and width combinations.
Impact Ice Loads on Spherical Geometries
Authors: Oldford Dan , Sopper Regina , Daley Claude
Published: June 2022

Laboratory experiments were conducted by crushing a spherical indenter into cylinders of ice. These experiments were aimed at proving the force estimates produced by a program called Direct Design for Polar Ships (DDePS). DDePS is a contact-geometry specific tool based on Popov type formulations. The ice crushing experiments were performed in open air at various impact speeds using a double pendulum impact apparatus. The ice was laboratory ice with properties close to that of multi-year ice. Values of impact speed, force and penetration were measured. This paper presents the results of these laboratory experiments which were in good agreement with DDePS.
Design Considerations in the Arctic: Ensuring Vessels are Capable of and Suitably Prepared for Operations in Cold Climates through Application of Advanced Design and Operations Studies to Improve Safety, Reliability and Risk Management
Authors: Cowardin William , Allan Roderick
Published: June 2022

World consumption of hydrocarbons continues to increase as developing nations join the developed world. Yet, easily accessible energy sources are becoming increasingly rare. This supply and demand dynamic is leading to exploration for oil and gas in increasingly challenging environments, particularly within the Arctic Circle. The challenges of operating in the Arctic are significantly different than elsewhere and society demands that companies take every step possible to insure that operations are conducted in a safe, reliable, and low risk manner - for both the crew and the environment. Within this paper the authors discuss some of the challenges of operating in the Arctic, the influence of these challenges on Arctic exploration and production vessel design (Figure 1), and how the design and subsequent operation of these vessels must manage potential deteriorations in functionality as a result of the cold climate operations.
Current Offshore Oil Spill Statistics
Authors: Bercha Frank , Smith Caryn , Crowley Heather
Published: June 2022

Probabilistic oil-spill occurrence estimates are used by the United States Department of the Interior (USDOI), Bureau of Ocean Energy Management (BOEM) to support the development of National Environmental Policy Act assessments for hypothetical exploration and development scenarios in the U.S. Chukchi and Beaufort seas. Due to the limited offshore oil development in this region, it was not feasible to base these oil-spill occurrence estimates on empirical data from that region alone. Rather, statistically significant non-Arctic empirical data on oil spills of 50 bbl or more from the U.S. Outer Continental Shelf (OCS) including the Gulf of Mexico (GOM) and Pacific (PAC) OCS, together with their variance, are used as a starting point, to be adjusted using fault and event tree methodologies to emulate Arctic conditions. This paper, however, addresses the base statistical data for U.S. GOM and PAC OCS oil spills as well as world wide data on well control incidents including oil and gas blowouts. The first database contains information on crude, condensate and refined petroleum oil spills reported to the Bureau of Safety and Environmental Enforcement (BSEE), primarily from the GOM. As reports on this database up to 2008 were published earlier by the authors, this paper focuses on more recent updates to 2012, giving oil spill statistics for subsea oil pipelines, platforms, and wells in the U.S. OCS. A preliminary assessment of loss of well control incidents is also reported based on both BSEE and SINTEF data. The paper discusses the results of the U.S. statistical updates and the world wide well control preliminary statistics developed under current contracts of the first author’s company with BOEM. Conclusions summarizing the status and applicability of the statistics presented are given, and avenues for future work are identified.
Tracking Icebergs with Remotely Monitored GNSS Satellite Telemetry Ice Drift Beacons
Authors: Acevedo Juan , Ulan-Kvitberg Chris , Tiffin Scott , Pilkington Roger , Cooper Logan , Soulis Eric , Hannah Dave
Published: June 2022

TRACKING icebergs provides information on their drift characteristics for iceberg drift research, iceberg drift model development and for keeping track of the icebergs during field operations. The paper provides details of a bi-directional GPS/Iridium satellite telemetry ice tracking drift beacon with flexible data transmission that has been used successfully to track pack ice and extreme ice features and a modified version, which could be deployed by a UAV. The paper also presents various ideas for attaching beacons to icebergs and a gripping mechanism designed to allow a beacon to adhere to inclined ice surfaces. Suggestions are provided to accommodate rolling and decay of the iceberg.
CRP Propulsor Development for Arctic Vessels
Authors: Jukola Hannu , Niemi Markus
Published: June 2022

Contra-rotating propellers (CRP) are used in various types of ships due to their superior efficiency and fuel economy. Azimuth propulsors have become the norm for ice-breaking vessels due to the maneuverability and operational versatility they provide. The ICE CRP propulsor possesses the high efficiency of CRP and the great maneuverability of an azimuth propulsors. Equipped with both pushing and pulling propellers, it also provides good ice-milling capabilities with the pulling propeller and enhanced ice-management ability with the unique propeller flow of a CRP propulsor. Steerprop has conducted a series of ice model tests at the Aker Arctic ice laboratory to study the effects of CRP propulsors propeller flow with varying installation angles and steering angles on the ice management and ice-going capability of ice-breaking vessels.
Characterization of the Iceberg Scour Regime on the Makkovik Bank, Labrador Shelf
Authors: King Tony , Sonnichsen Gary V.
Published: June 2022

The Bjarni Development Study (Petro-Canada, 1983) indicated a very high iceberg scour risk for gas export pipelines from the Makkovik Bank to landfall on the Labrador coast. Re-analysis of the available data identified conservative elements in the 1983 work (King, 2002). Subsequent seabed surveys conducted to define the iceberg scour regime have resulted in over 5,800 km2 of high resolution multibeam on, or near, the Makkovik Bank. This data set contains more than 27,000 analyzed scour features with depth and geometry measurements at over 260,000 cross-sections. Limited repetitive mapping to estimate the iceberg scour formation rate has also been performed.
An Ice Failure Explanation of Dynamic Ice Loading Events of Molikpaq
Authors: Yan Qu
Published: June 2022

This paper addresses an explanation to the ice failure process of the phase-locked dynamic ice loading events on Molikpaq in 1986. The ice failure is illustrated as a ductile damage-collapse process with the general features that the ice failure is a discrete ductile process that can be separated into damage and collapse phases; in the damage phase cracks propagate in the ice but the ice does not break and in the collapse phase the ice is pulverized into powder; the ice crushing is a ductile process with the typical simultaneously failure characteristic; the failure has a specific failure length which is related to displacement of the structure. The full-scale data show that the ductile damage collapse failure happens at the ice drift velocity lower than 0.1 m/s. The failure is simultaneous along ice-structure interface and induces high global ice load without width effect. It also induces saw teeth ice load and caused dynamic response of the platform. The response is not an oscillation process and is different to the lock-in vibration of the jacket platform and light house because the caisson is close to an over damped or critically damped system. The field measurement also shows that failure length of the ice is about 5 cm for those events. A simple analysis shows that displacement of the structures is approximately ½ to 1 times of the failure length.
Motion Control of Underwater Vehicle Floating in Space under Ice Cover
Authors: Karlinskiy Sergei L. , Iurkanskii Alexandr V.
Published: June 2022

The subject of the paper is the control of vertical motion of the underwater vehicle operation under ice cover. Underwater vehicles are usually controlled by planes and/or by water ballasting using a compensating tank. But, taking into account the very low allowed operation speed of underwater vehicles near ice cover, ballasting remains the mostly effective way of control. The vertical motion is influenced by the vehicle’s residual buoyancy which depends on two variables: (1) a pressure hull volume reduction depth-wise, (2) seawater density variation depth-wise, as well as (3) a vertical force impulse induced by an unexpected contact with ice cover. The control of vertical motion of the vehicle may be done better by use of seawater density current information, which enhances the reliability and controllability of underwater vehicle maneuvering. Also the information on a vertical distance to ice cover and a corresponding vertical velocity shall be used for reduction of the vehicle vertical speed, i.e. for diminution of ice contact force impulse. So, the instrumentation for the underwater vehicle for seawater density metering and also for measuring of vertical distance to ice cover is very useful for effective motion control of underwater vehicle The control laws for the compensating tank ballast control are developed in the paper. To demonstrate the advantages of the developed control method, a computer simulation of underwater vehicle vertical maneuvers under ice cover is performed.
Kits for the Enhancement of Surface Ship Operations in Cold Weather
Authors: Tomaszek Heather A. , Bassler Christopher C.
Published: June 2022

Because U.S. Navy (USN) surface ships are not specifically designed for conducting Arctic operations, a study was performed to examine and identify options to increase the operability of existing ships in extreme cold weather environments. Previous research about Arctic operations was performed by the USN in the 1980s, however, as platforms and systems have changed and anticipated missions have shifted, updates to that research are needed. Possible means to mitigate identified challenges are discussed, along with materiel solutions from commercially available equipment. Items for a deployable kit for the USN oilers for cold weather operations are identified as a case study for cold weather kits on USN ships. Options for delivering the kit to the ship from shore were examined. These deployable kits can provide a means for USN surface ships to better operate in extreme cold environments and carry out required missions.
Challenges in Determining Design Iceberg Impact Loads for Offshore Structures
Authors: Stuckey Paul , Fuglem Mark
Published: June 2022

Designing offshore structures for iceberg loads in arctic and subarctic regions presents unique challenges. The ISO 19906 standard provides guidance for the calculation of design ice loads using both deterministic and probabilistic approaches. C-CORE has developed and applied a software package, the Iceberg Load Software, for determining global and local design loads associated with iceberg impacts. Using this software, a number of issues related to design global and local iceberg impact loads for fixed structures are examined. This paper highlights these issues, including iceberg and structure shape, global ice crushing pressure, low iceberg impact frequency, ice management influences and variation in design loads and moments with impact location on structure.
Conversions of Icebreakers to Meet New Environmental Standards in Emissions
Authors: Salminen Jukka , Patrakka Kari , Vauraste Tero
Published: June 2022

In September 2011 Arctia Offshore Ltd. was awarded a contract with major oil company to assist their project in the Alaskan waters with our multipurpose icebreakers MSV Fennica and MSV Nordica (Figure 1). Customer campaign is carried out in environmental sensitive area and rules in Chukchi Sea and Beaufort Sea are much higher than MARPOL rules. US EPA (Environmental Protection Agency) is monitoring customers air permit and NOx & SOx limits. In order to meet tight limits we found that selective catalytic reduction (SCR) and using Ultra Low Shulphur Diesel (ULSDO) is the best option. This paper will describe the design, installation and user experience of SCR system onboard multipurpose icebreakers Fennica and Nordica.
Characteristics of Field-scale High Pressure Zones during Non-simultaneous Failure of Thin First-year Sea Ice
Authors: Taylor Rocky , Richard Martin
Published: June 2022

For temperate ice regions, the guidance provided by current design codes regarding ice load estimation for thin ice is unclear, particularly for local pressure estimation. During the non-simultaneous failure of ice under compression, spalling fracture localizes contact into high pressure zones (hpzs), through which the majority of loads are transmitted. Much of our present understanding of hpzs comes from inferences made from the analysis of pressure panel data collected during medium-scale field tests or full-scale measurements on ships or structures. During medium-scale field indentation tests conducted by the Japan Ocean Industries Association (JOIA) from 1996-2000, tactile pressure sensors were also deployed. The JOIA dataset provide detailed information about pressure distributions at a sufficiently high resolution so as to allow for the identification and tracking of individual hpzs throughout an interaction. Given their importance in the transmission of loads during an ice-structure interaction, understanding the birth, evolution and death of individual hpzs is seen as being an important direction both for guiding fundamental studies of ice mechanics and also for guiding the development of new ice load models. Recent analysis of these tactile sensor data has led to the development of an empirical hpz-based model which can be applied to model local and global pressures for thin ice conditions (Taylor and Richard, 2014). From this analysis, new insights into the nature of hpzs for thin first year sea ice during non-simultaneous failure have resulted. In the present paper, an overview is provided of analysis techniques used to extract information about individual hpzs from the tactile sensor dataset, as well as the characteristics of these hpzs. Aspects discussed include spatial and temporal characteristics of high pressure zones, as well as pressure and geometric attributes. While observations of the shape of spatial distributions and total contact area covered by hpzs are consistent with previous observations (line-type distributions with total contact area on the order of 10% of the nominal interaction area), these results indicate that individual hpzs are smaller and more densely distributed than indicated by previous analyses based solely on pressure panel data. The implications of this finding in terms of scale effects and ice load modeling are discussed.
Model Tests of the New Canadian Polar Icebreaker (John G Diefenbaker)
Authors: Wang Jungyong , Millan James , McGreer Dan
Published: June 2022

This paper provides an overview of a model test program to evaluate performance of the new Canadian Polar icebreaker, John G. Diefenbaker design. The National Research Council Canada (NRC), the Canadian Coast Guard, STX Canada Marine (STXM) and Aker Arctic Technology (AARC) worked closely together to develop a test program, to carry out tests and to discuss test results as well as improvements. The model test program included resistance, propulsion and maneuvering (turning circle) tests both in ice and open water; ice ridge penetration tests; the wake survey, seakeeping and stationkeeping tests in open water. The model tests were carried out at the three model basins (ice tank, open water tow tank and ocean engineering basin) at the NRC’s facilities in St. John’s, NL. The test results were well utilized in the vessel’s design development as well as providing performance evaluation tools at the conceptual design stage. Some of the test results are presented here.
On the Nonlinear Response of a Tri-SWACH Vessel in Incident Waves
Authors: Onas Adrian S. , Falls Jaye
Published: June 2022

In this article, the nonlinear motion response of a Trimaran with SWATH-type center hull vessel (TriSWACH) is investigated and compared with the linear response using a hybrid method combining a regression analysis of the viscous damping generated by the hulls with a nonlinear potential flow simulation of rigid body motions. The TriSWACH is a hybrid trimaran hull form, developed using the SWATH (small waterplane area twin hull) technology, from which a single small waterplane area center hull is retained. It is designed to keep the magnitude of its motion response below its equivalent monohull counterpart while also benefiting from large intact transverse stability provided by its side hulls. Since a significant portion of the total damping generated by the submerged hull girder is viscous in nature, an accurate prediction of the steady-state motion response near natural frequency is highly dependent upon the correct modeling of the boundary layer flow. The total damping coefficients obtained experimentally from motion response transfer functions are used to augment the potential flow solution and improve the numerical prediction method at large angles of inclination, characteristic of operation in rough weather near the peak frequency of the motion response.

Introduction

SWATH1-type vessels exhibit ship motions less pronounced than a monohull of the same displacement. It has been reported that SWATHs have the potential to significantly reduce the impact of harsh environmental conditions on ship operability (Kennell et al. 1985). Although the interest in SWATH technology in ship design continued over the past few decades, it was recognized that this hull form required modifications in order to accommodate high-speed applications. An example of a TriSWACH concept is shown in Fig. 1, with the main distinguishing features compared to the SWATH-type vessel being the presence of the side hulls and one single main hull.
Baclofen-Induced Coma Reversible by Dialysis in a Patient Affected by Acute Kidney Injury
Authors: Malle Oliver , Urbanic Purkart Tadeja , Amrein Karin
Published: June 2022

Baclofen is commonly used to treat muscular spasticity and other conditions such as pain, alcohol withdrawal, and myoclonus. It is contraindicated in chronic kidney disease. As it is eliminated predominantly by the kidneys, acute kidney injury can lead to acute baclofen overdose with central nervous system affection due to drug accumulation. Currently, there is no consensus about the treatment of baclofen intoxication.A 67-year-old woman was admitted with altered mental status and vomiting. Initially, she was unresponsive/lethargic and kept the intermittent ability of nonverbal communication gradually sliding into a comatose state with apneas. Initial neurologic and radiologic examinations ruled out a structural lesion of the central nervous system. Laboratory data showed acute kidney injury and suspected urinary tract infection with extremely high inflammation parameters. The patient had a history of multiple sclerosis and received daily oral baclofen. Baclofen-induced coma secondary to baclofen overdose caused by renal insufficiency was suspected and renal dialysis started within 24 hours. Cystoscopy and implantation of a ureteric stent were necessary because of obstructive nephropathy. During hemodialysis, the patient’s mental status steadily improved. The patient woke up and was oriented and cooperative. Both clinical and laboratory data were widely normalized within days.Diagnosis of baclofen overdose can be challenging, but adequate supportive therapy, including hemodialysis, should be considered to reduce the length of comatose state and the risk of aspiration pneumonia.
Staging Aural Fugitivity through Nineteenth-Century Freak Show Archives
Authors: Bainbridge Danielle
Published: June 2022

This essay analyzes aural fugitivity in archives of nineteenth-century freak show performers Millie Christine McKoy and traces the difficulties in staging these archives for twenty-first-century audiences. Aural fugitivity couples theories of Black fugitivity with sound studies analysis of enslavement and nineteenth-century performance in order to explore the legacies of freak show and sideshow performers who were also enslaved. This essay, taking as an object of analysis the author's own creative work based on these archives, traces the biography of the McKoys alongside their performance strategies that resisted full archival capture through fugitive sound.
Documenting Events in Times of Crisis
Authors: Sucha-xaya Naya
Published: June 2022

Traditional Thai archival practice, which consists of documenting events and ceremonies, can be traced to the activities of royal scribes in past centuries. Today, this practice is carried out by national archivists, far removed from people’s daily lives. However, current digital transformations and participatory, networked culture are making documentation more relevant now than in the past – and to virtually everyone.

Focusing on records from times of historic emergencies, this article aims to understand Thai documentation behaviour from a socio-cultural perspective, with an eye toward considering how to adjust traditional archival practice to the contemporary Thai context. Archival sources documenting two crises – the Franco-Siamese military conflict of 1893 and a catastrophic tropical storm in southern Thailand in 1962 – are compared with new social media–based documentation consisting of posts, comments, and other activity during the cave rescue incident in northern Thailand in 2018. This comparison is complemented by insights from national archivists and other documentation experts regarding their experiences and their thoughts on the future of Thai archival practice.

Together, this comparison and these insights show that Thai documentation retained some of its original principles and functions in Thai society when it moved into a digital landscape, but there is still room for it to become more engaging and, in some ways, better suited to common understandings of archives as a “hall of fame.” This article suggests that Thai archivists should embrace a participatory archives model in which professional archivists remain essential but shift their focus from recording and guarding information to fostering the reliability and sustainability of documentation.
Mechanism of strain-induced magnetic properties changes for metal magnetic memory technology on atomic scale
Authors: Wang Si-Yuan , Liang Tian-Shou , Shi Peng-Peng ,   School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China,   School of Mechanical and Electrical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Published: June 2022

Magnetic non-destructive testing technology is widely used to detect stresses and defects in ferromagnetic materials based on the magneto-mechanical coupling effect. In the existing studies, calculated are the magnetic moment variations of the α-Fe system under axial tension and compression by using first-principles study, and the magneto-mechanical coupling mechanism is preliminarily discussed at an atomic level for the magnetic testing technology. In this work, taking the more complex doping systems Fe-C and Fe-Mn for examples, under different loading conditions of tension, compression and shearing, the coupling mechanisms such as the magnetic moment changes in different types of atomic doping systems are discussed in detail. The results show that the α-Fe and doping systems follow different changing laws of magnetic moments and energy under different types of strains. The detailed analyses of the density of states, the band structure, and the atomic magnetic moment show that doping elements change the morphology of band structure and the peak value of density of states by affecting the magnetic moment of Fe atoms, which leads the changing laws of magnetic moment and energy to be different from each other. In this work, discussed are the magneto-mechanical effects on the atomic level for ferromagnetic materials with different loading types, different doping elements and different element content. The results can be used as an important part of the multi-field coupling mechanism for magnetic testing technology.
Acoustic scattering properties of multilayer membrane structured magnetic microbubbles
Authors: Zhang Ya-Jing , Wang Ming-Hao , Lei Zhao-Kang , Shen Wen-Jie , Ma Yan-Qiang , Mo Run-Yang ,   Shaanxi Key Laboratory of Ultrasonics, Shaanxi Normal University, Xi’an 710119, China
Published: June 2022

Normal ultrasound contrast agents (UCAs) loaded with magnetic nanoparticles are called magnetic microbubbles (MMBs), which can be used in multimodal imaging, thrombolytic therapy, and targeted drug delivery. The MMBs are often studied by in situ measurement techniques, however scattering model is the basis of inversion techniques. Therefore, we develop a scattering model of multilayer structured MMBs with magnetic fluid inner layer and phospholipid outer layer, in which outer layer’s viscoelasticity and the effect of nanoparticles on inner layer’s density are considered, while scattered sound fields in each region are obtained by solving normal series. The MMB model is compared with other bubbles, and its acoustic scattering characteristics are analyzed numarically, including the effects of radius, magnetic nanoparticle volume fraction, inner layer thickness and outer layer characteristics parameters. The results show that when the volume fraction α of magnetic nanoparticles in the inner layer does not exceed 0.1, magnetic nanoparticles have a two-sided effect on resonant scattering of MMBs, depending mainly on its radius, and the bubble has a critical radius value. If the radius of MMBs exceeds this critical value, the particles will enhance scattering, on the contrary, if the radius of MMBs is smaller than this critical value, the particles will reduce scattering; for a given microbubble radius, when α is not more than 0.1, the larger the α value, the stronger the resonant scattering of MMBs will be; the smaller the thickness of the inner film layer and outer film layer or the Larmé constant, the stronger the scattering will be. This study provides a theoretical guidance for the optimal structural design of MMBs and its in situ monitoring and therapeutic applications.
Waves model of three-dimensional cavity flow and its oscillation mode evolution
Authors: Luo Yong , Yang Dang-Guo , Wu Cong-Hai , Li Hu , Zhang Shu-Hai , Wu Jun-Qiang ,   1 State Key Laboratory of Aerodynamics, Mianyang 621000, China,   High Speed Aerodynamics Research Institute of Chinese Aerodynamics Research and Development Center, Mianyang 621000, China
Published: June 2022

The high-speed flow passing through an open cavity will generate complex wave structures. The propagation and evolution of these waves can lead to the self-sustained oscillation of the cavity flow and cause strong noise. The cavity noise may contain multiple acoustic modes with discrete frequencies in the spectrum. A clear understanding of the evolution of the oscillation mode will provide a theoretical basis for the study of the noise control method. By analyzing the waves scattering process at both ends of the cavity at subsonic speed and supersonic speed and considering the three-dimensional spanwise flow, the three-dimensional wave model for subsonic cavity flow and supersonic cavity flow are established respectively. The model involves the nonlinear interaction between different waves in the cavity, which may produce other components different from the Rossiter mode. Based on the pressure signal data measured from the experiments on cavity flow for Mach numbers 0.9 and 1.5, the parameters in the model are linearly estimated. The pressure signals are analyzed by using FFT, bispectral analysis, and continuous wavelet transform. The results show that there are nonlinear interactions between the main oscillation modes, thus producing strong harmonics. The mode-switch phenomenon is observed in both the subsonic case and the supersonic case. The mode-switching exhibits low-frequency behavior and shows randomness as a whole.
On modal forms of the two-parametric weak intuitionistic fuzzy implication
Authors:   Department of Economics, The Great Poland University of Social and Economics, Dworniczak Piotr
Published: June 2022

In this paper new modal forms of the two-parametric weak intuitionistic fuzzy implication are introduced. Fulfillment of some properties, together with Modus Ponens and Modus Tollens inference rules, are investigated. Negations generated by implications are presented.
Primary interval-valued intuitionistic fuzzy M group
Authors:   Ramanujan Research Center, PG and Research Department of Mathematics, Prasannavengeteswari G. , Gunasekaran K. ,   Government Arts and Science College, Nandakumar S. ,   PG and Research Department of Mathematics, Government Arts College
Published: June 2022

The concept of interval-valued intuitionistic fuzzy M group is extended by introducing primary interval-valued intuitionistic fuzzy M group and primary interval-valued intuitionistic fuzzy anti M group using this concept primary interval-valued intuitionistic fuzzy M group and primary interval-valued intuitionistic fuzzy anti M group is defined and using some properties are established.