Abstract: Cây xanh đường phố là một bộ phận quan trọng trong hệ thống cây xanh và cảnh quan đô thị. Quy hoạch cây xanh là một trong các nội dung của quy hoạch và quản lý môi trường đô thị. Mục đích của nghiên cứu này là đánh giá được hiện trạng cây xanh đô thị trên một số tuyến đường chính và đề xuất quy hoạch cây xanh đô thị cho thành phố Thái Nguyên. Nghiên cứu sử dụng phương pháp khảo sát thực địa, được thực hiện 3 lần vào quý II năm 2021 nhằm phân loại, bổ sung số liệu hoặc kiểm tra lại những số liệu mà trong quá trình tổng hợp còn thiếu hoặc chưa hợp lí. Kết quả điều tra cho thấy, trên 29 tuyến đường chính của thành phố Thái Nguyên có khoảng 7.335 cây xanh đô thị. Đề xuất đến năm 2030, thành phố cần trồng thêm khoảng 5.432 cây xanh trên 29 tuyến đường chính này để đáp ứng nhu cầu khoảng cách cây xanh đô thị đường phố theo quy định Thông tư số 20/2005/TT-BXD về quản lý cây xanh đô thị. Hệ thống cây xanh trong thành phố hiện nay không đồng đều về chủng loại cũng như sự phân bố. Chính vì vậy cần đưa ra các giải pháp đồng bộ về quy hoạch mảng xanh đảm bảo cho thành phố phát triển bền vững.

Abstract: Dong Van rock highland - the first international Geopark of Vietnam and geoheritage preservationDong Van Karst Plateau has the richness and diversity in geoheritages. Initial research conducted by Vietnameseand foreign geologists highlighted five types of geological heritages (according to UNESCO classification): type Apalaeogeology, type B- geomorphology, type D- rock, type E-stratigraphy, type I-tectonics. Besides geoheritages, thebiodiversity and the historical, cultural and societal richness of Dong Van Karst Plateau (which met UNESCO criteria of aglobal geopark), has made it recognised as a member of global Geopark Network by UNESCO for the years 2010 - 2014. The management, conservation and rational exploitation of heritages (especially geoheritages) should be raised seriously and given priority in every economic development strategy of the local government, in order to maitain its honourable title and enhance the sustainable socio-economic development. This paper introduce some main features of Dong Van Karst Plateau Geopark, the event of the UNESCO rewarding Dong Van Karst Plateau with the title “Global Geopark” and the issues of preservation of its local geoheritages.

Abstract: As diagnostic and therapeutic modalities for Hodgkin's Lymphoma ( HL ) continue to improve, patient‐related factors affecting survival become more difficult to identify. Very little is known about the relationship between the primary site of lymph node ( LN ) involvement and survival of HL patients. We retrospectively analyzed the United States Surveillance, Epidemiology and End Results ( SEER ) database for 12,658 HL patients reported between 1973 and 2010 using survival analysis and time‐interval multiple logistic regression ( MLR ) to disclose that relationship. The effect of all primary LN sites on the survival of HL patients was supported. The intra‐abdominal ( IAB ) primary LN site was significantly associated with the worst survival. The pelvic (P) LN sites were significantly and independently associated with nearly 2 times and 2.5 times the probability of having 1‐year overall mortality ( OM ) and 1‐year cancer‐specific mortality ( CSM ), respectively. Head, face and neck ( HFN ) primary LN sites were significant and independent predictors of better overall and HL ‐specific survival. A worse survival with the intra‐abdominal primary LN site was probably related to their association with higher age, or advanced stages of HL . The biological basis behind the aggressiveness of intra‐abdominal and pelvic LN sites is yet to be investigated.

Abstract: The Lung Cam expanded stratigraphic succession in Vietnam is correlated herein to the Meishan D section in China, the GSSP for the Permian–Triassic boundary. The first appearance datum of the conodont Hindeodus parvus at Meishan defines the Permian–Triassic boundary, and using published graphic correlation, the Permian–Triassic boundary level has been projected into the Lung Cam section. Using time-series analysis of magnetic susceptibility (χ) data, it is determined that H. parvus arrived at Lung Cam ∼18 kyr before the Permian–Triassic boundary. Data indicate that the Lung Cam section is expanded by ∼90 % relative to the GSSP section at Meishan. Given the expanded Lung Cam section, it is possible to resolve the timing of significant events during the Permian–Triassic transition with high precision. These events include major stepped extinctions, beginning at ∼135 kyr and ending at ∼110 kyr below the Permian–Triassic boundary, with a duration of ∼25 kyr, followed by deposition of Lung Cam ash Bed + 13, which is equivalent to Siberian Traps volcanism is graphically correlated to a precession Time-series model, placing onset of this major volcanic event at ~242 kyr before the PTB. The Meishan Beds 25 and 26, at ∼100 kyr before the Permian–Triassic boundary. In addition, the elemental geochemical, carbon and oxygen isotope stratigraphy, and magnetostratigraphy susceptibility datasets from Lung Cam allow good correlation to other Permian–Triassic boundary succession. These datasets are helpful when the conodont biostratigraphy is poorly known in sections with problems such as lithofacies variability, or is undefined, owing possibly to lithofacies exclusions, anoxia or for other reasons. The Lung Pu Permian–Triassic boundary section, ∼45 km from Lung Cam, is used to test these problems.

Abstract: Two Permian-Triassic boundary (PTB) successions, Lung Cam in Vietnam, and Lukač in Slovenia, have been sampled for high-resolution magnetic susceptibility, stable isotope and elemental chemistry, and biostratigraphic analyses. These successions are located on the eastern (Lung Cam section) and western margins (Lukač section) of the Paleo-Tethys Ocean during PTB time. Lung Cam, lying along the eastern margin of the Paleo-Tethys Ocean provides an excellent proxy for correlation back to the GSSP and out to other Paleo-Tethyan successions. This proxy is tested herein by correlating the Lung Cam section in Vietnam to the Lukač section in Slovenia, which was deposited along the western margin of the Paleo-Tethys Ocean during the PTB interval. It is shown herein that both the Lung Cam and Lukač sections can be correlated and exhibit similar characteristics through the PTB interval. 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