This work is devoted for gauge boson sector of the recently proposed model based on SU(3) C ⊗ SU(3) L ⊗ U(1) X group with minimal content of leptons and Higgses. The limits on the masses of the bilepton gauge bosons and on the mixing angle among the neutral ones are deduced. Using the Fritzsch anzats on quark mixing, we show that the third family of quarks should be different from the first two. We obtain a lower bound on mass of the new heavy neutral gauge boson as 6.051 TeV. Using data on branching decay rates of the Z boson, we can fix the limit to the Z and Z ′ mixing angle φ as −0.001 ≤ φ ≤ 0.0003.
The giant mudskipper Periophthalmodon schlosseri (Pallas, 1770) is a commercial fish and distributes in estuaries and coastline in Mekong Delta, but until now there is only a study on the growth pattern and condition factor variation of this species in Vietnam. This study was conducted in the coastline at Tran De, Soc Trang from January 2018 to December 2018 with 486 individuals were analysed to provide data on gastrointestinal morphology, food and feeding habits of this species. This species is a carnivorous fish due to RLG = 0.697 ± 0.008 SE and feeds mainly on carbs (Uca sp., 76.06%). Besides crabs, small fish (17.63%), shrimps (3.85%), detritus (1.85%) and mollusca (0.61%) are also found in fish stomach. Moreover, we found that 4 individuals that eat ants. The food composition of P. schlosseri does not vary with genders but by season. There is not different in the fullness index (FI) between genders. The FI of the immature fish is higher than that of the mature one and in the rainy season is higher than that in the dry season. The Clark index of giant mudskipper does not be significantly different between genders and seasons. The results offer scientific data on the nutritional characteristics of this species, which is the basis for research on aquaculture and sustainable exploitation of this goby. Keywords Clark index, food composition, fullness index, Periophthalmodon schlosseri, RLG. References [1] E.O. Murdy, A taxonomic revision and cladistic analysis of the oxudercine gobies (Gobiidae, Oxudercinae), Records of the Australian Museum, Sydney, Australia, 1989, Supplement 11. http://dx.doi.org/10.3853/j.0812-7387.11.1989.93 [2] D. A. Clayton, Mudskippers, Oceanography and Marine Biology: An Annual Review, 31 (1993) 507-577. [3] R. Froese & D. Pauly, FishBase, World Wide Web electronic publication, https://www.fishbase.in/ summary/Periophthalmodon-schlosseri.html, 2019 (Truy cập: 13/03/2019). [4] T.X. Tám, P.V. Ngọt, N.T. Hà, Góp phần nghiên cứu về đa dạng thành phần loài cá ở hệ sinh thái rừng ngập mặn Cần Giờ, Thành phố Hồ Chí Minh, Tạp chí khoa học Đại học Sư phạm Thành phố Hồ Chí Minh, 40 (2012) 91-104. [5] T.Đ. Định, S. Koichi, N.T. Phương, H.P. Hùng, T.X. Lợi, M.V. Hiếu, U. Kenzo, Mô tả định loại cá Đồng bằng sông Cửu Long, Việt Nam, Nxb Đại học Cần Thơ, Cần Thơ, 2013. [6] A. Ishimatsu, Y. Hishida, T. Takita, T. Kanda, S. Oikawa, T. Takeda, K. K. Huat, Mudskippers store air in their burrows, Nature, 391 (1998) 237-238. http://dx.doi.org/10.1038/34560. [7] A. Ishimatsu, N.M. Aguilar, K. Ogawa, Y. Hishida, T. Takeda, S. Oikawa, T. Kanda, K.K. Huat, Arterial blood gas levels and cardiovascular function during varying environmental conditions in a mudskipper, Periophthalmodon schlosseri, Journal of Experimental Biology, 202 (1999) 1753-1762. [8] Ishimatsu, A., Takeda, T., Tsuhako, Y., Gonzales, T. T., K. H. Khoo, Direct evidence for aerial egg deposition in the burrows of the Malaysian mudskipper, Periophthalmodon schlosseri, Ichthyological Research, 56 (2009) 417-420. https://doi.org/10.1007/s10228-009-0113-2 [9] J. Zhang, T. Taniguchi, T. Takita, B.A. Ali, A study on the epidermal structure of Periophthalmodon and Periophthalmus mudskippers with reference to their terrestrial adaptation, Ichthyological Research, 50 (2003) 310-317. https://doi.org/10.1007/s10228-003-00173-7. [10] Y. K. Ip, S. F. Chew, S. F., A. L. L. Lim, W. P. Low, The mudskipper, In “Essays in Zoology, Papers Commemorating the 40th Anniversary of Department of Zoology” National University of Singapore Press, Singapore, 83-95, 1990. [11] M. A. Ghaffar, F. Yakob, S. M. Nor, A. Arshad, Foraging behavior and food selection of giant mudskipper (Periophthalmodon schlosseri) at Kuala Gula, Matang Mangrove Reserve, Perak, Malaysia, Coastal Marine Science, 30 (2006) 263-267. https://doi.org/10.15083/00040787 [12] S. Z. Zulkifli, F. Mohamat-Yusuff, A. Ismail, N. Miyazaki, Food preference of the giant mudskipper Periophthalmodon schlosseri (Teleostei: Gobiidae), Knowledge and Management of Aquatic Ecosystems, (2012) 07p00-07p10. https://doi.org/10.1051/kmae/2012013. [13] V. T. Toàn, T. Đ. Định, Nghiên cứu đặc điểm dinh dưỡng cá bống dừa (Oxyeleotris urophthalmus) phân bố dọc theo sông Hậu, Tạp chí Khoa học Đại học Cần Thơ, Thủy sản (2014) 192-197. [14] D. M. Quang, Preliminary study on dietary composition, feeding activity and fullness index of Boleophthalmus boddarti in Mekong Delta, Vietnam, Tap chi Sinh hoc, 37 (2015) 252-257. https://doi.org/10.15625/0866-7160/v37n2.6599. [15] D. M. Quang, J. G. Qin, S. Dittmann, T. D. Dinh, Seasonal variation of food and feeding in burrowing goby Parapocryptes serperaster (Gobiidae) at different body sizes, Ichthyological Research, 64 (2017) 179-189. https://doi.org/10. 1007/s10228-016-0553-4. [16] Đ. M. Quang, N. T. Duy, D. Sóc, Tính ăn và phổ thức ăn của cá bống trứng Eleotris melanosoma ở ven biển tỉnh Sóc Trăng, Hội nghị Khoa học toàn quốc về Sinh thái và Tài nguyên Sinh vật lần thứ 7, NXB Khoa học Tự nhiên và Công nghệ, 1873-1879, 2017. [17] D. M. Quang, T. T. Lam, N. T. K. Tien, The relative gut length and gastro-somatic indices of the mudskipper Periophthalmodon septemradiatus (Hamilton, 1822) from the Hau River, VNU Journal of Science: Natural Sciences and Technology, 34 (2018) 75-83. https:// doi.org/10.25073/2588-1140/vnunst.4775. [18] D. M. Quang, Growth and body condition variation of the giant mudskipper Periophthalmodon schlosseri in dry and wet seasons, Tap chi Sinh hoc, 38 (2016) 352-358. https://doi.org/10.15625/0866-7160/v38n3.7425. [19] G. V. Nikolsky, Ecology of fishes, Academic Press, London, United Kingdom, 1963. [20] N. V. hanh, N. N. Châu, N. Đ. Tứ, N. T. Hiền, A. Vanreusel, N. Smol, Động vật đáy hệ sinh thái rừng ngập mặn Cần Giờ, Nxb Khoa học Tự nhiên và Công nghệ, Hà Nội, 2013. [21] S. P. Biswas, Manual of Methods in Fish Biology, South Asian Publishers, New Delhi, 1993. [22] A. A. Shorygin, Feeding and trophic relations of fishes of the Caspian Sea, Pishchepromizdat, Moscow, 1952. [23] F.N. Clark, The weight-length relationship of the California Sardine (Sardina cærulea) at San Pedro, Division of fish and game of California, California, 1928. [24] Đ.M. Quang, T.T. D. My, Hình thái ống tiêu hóa, tính ăn và phổ thức ăn của cá bống mít Stigmatogobius pleurostigma (Bleeker, 1849) phân bố ven biển Sóc Trăng, Tạp chí Khoa học ĐHQGHN: Khoa học Tự nhiên và Công nghệ, 34 (2018) 46-55. https://doi.org/10.25073/2588-1140/vnunst.4740. [25] N.M. Tuấn, T.Đ. Định, Nghiên cứu tính ăn và phổ thức ăn cá bống cát Glossogobius aureus Akihito & Meguro, 1975, Tạp chí khoa học Trường Đại học Trà Vinh, 29 (2018) 63-70.
This study provided an understanding of feeding habit and intensity of the mudskipper Periophthalmodon septemradiatus, which was a potential aquarium pet, by analyzing the relative gut length (RGL) andgastro-somatic (GaSI) indexes. Fish specimens were caught by fishing rods from the estuary in Soc Trang province to the upstream in An Giang province of Hau River during a period of one year from August 2017 to July 2018. Data analysis of a collection of 1,504 fishes showed that RGL did not change with fish size, resulting in the feeding habit of P. septemradiatus did not change with fish size. By contrast, the feeding habit of this mudskipper varied with place, month and season as the RGL significantly different between place, month and season, but both males and females fall into carnivorous fish as RGL was <1. Similarly, the feeding intensity of this specice did not change with fish size, as the GaSI was not significantly different among four fish size groups. Meanwhile, the mudskipper displayed spatial, temporal and seasonal variations in feeding intensity since GaSI significantly changed with place, month and season. The changes of feeding habit and intensity of P. Septemradiatus were not regulated by the interaction of fish size and place, fish size and season, and place and season. These results provided new knowledge on feeding habit and intensity of this fish specice, being used for the understanding of fish adaption and conservation in the study region. Keywords Gastro-somatic index, mudskipper, Periophthalmodon septemradiatus, relative gut length References [1] Murdy, E. O. & Jaafar, Z., Taxonomy and systematics review, In: Z. Jaafar, E. O. Murdy (eds) Fishes out of water: biology and ecology of mudskippers, CRC Press, Boca Raton, pp. 1-36, 2017 [2] Murdy, E. O., A taxonomic revision and cladistic analysis of the oxudercine gobies (Gobiidae, Oxudercinae), Australian Museum Journal, 11 (1989) 93.[3] Murdy, E., Systematics of Oxudercinae, In: R. A. Patzner, J. L. V. Tassell, M. Kovacic, B. G. Kapoor (eds) The biology of gobies, Science Publishers, New Hampshire, United States, pp. 99-106, 2011 [4] Bhatt, N. Y., Patel, S. J., Patel, D. A. & Patel, H. P., Burrowing activities of goby fish in the recent intertidal mud flats along the Navinal coast, Kachchh, Western India, Journal of the Geological Society of India, 74 (2009) 515-530.[5] Al-Hussaini, A. H., On the functional morphology of the alimentary tract of some fish in relation to differences in their feeding habits: anatomy and histology, Quarterly Journal of Microscopical Science, 3 (1949) 109-139.[6] Desai, V. R., Studies on fishery and biology of Tor tor (Hamilton) from river Narmada. I. Food and feeding habits, Journal of the Inland Fisheries Society of India, 2 (1970) 101-112.[7] Le, T., Nguyen, M. T., Nguyen, V. P., Nguyen, D. C., Pham, X. H., Nguyen, T. S., Hoang, V. C., Hoang, P. L., Le, H. & Dao, N. C., Provinces and City in the Mekong Delta, Education Publishing House, Ha Noi, 2006.[8] Khaironizam, M. Z. & Norma-Rashid, Y., First record of the mudskipper, Periophthalmodon septemradiatus (Hamilton) (Teleostei: Gobiidae) from Peninsular Malaysia, Raffles Bulletin of Zoology, 51 (2003) 97-100.[9] Wand, M. P., Data-based choice of histogram bin width, The American Statistician, 51 (1997) 59-64.[10] Vo, T. T. & Tran, D. D., Study on nutritional characteristics of Oxyeleotris urophthalmus fish distributed along the Hau River, Can Tho University Journal of Science, Fishery (2014) 192-197.[11] Dinh, Q. M., Nguyen, D. T. & Danh, S., Food and feeding habits of the broadheah sleeper Eleotris melanosoma from coastline in Soc Trang, Proceedings of the 7th National Scientific Conference on Ecology and Biological Resources, Publishing house for Science and Technology, 1873-1879, 2017.[12] Tran, D. D., Some aspects of biology and population dynamics of the goby Pseudapocryptes elongatus (Cuvier, 1816) in the Mekong Delta, PhD thesis, Universiti Malaysia Terengganu, 2008.[13] Dinh, Q. M., Qin, J. G., Dittmann, S. & Tran, D. D., Seasonal variation of food and feeding in burrowing goby Parapocryptes serperaster (Gobiidae) at different body sizes, Ichthyological Research, 64 (2017) 179-189.[14] Dinh, Q. M. & Tran, M. T. D., Digestive tract morphology, food and feeding habits of the goby Stigmatogobius pleurostigma (Bleeker, 1849) from the Coastline in Soc Trang, VNU Journal of Science: Natural Sciences and Technology, 34 (2018) 46-55.
This work is devoted for gauge boson sector of the recently proposed model based on SU(3)C ⊗ SU(3)L ⊗ U(1)X group with minimal content of leptons and Higgses. The limits on the masses of the bilepton gauge bosons and on the mixing angle among the neutral ones are deduced. Using the Fritzsch anzats on quark mixing, we show that the third family of quarks should be different from the first two. We obtain a lower bound on mass of the new heavy neutral gauge boson as 4.032 TeV. Using data on branching decay rates of the Z boson, we can fix the limit to the Z and Z mixing angle φ as −0.001 ≤ φ ≤ 0.0003.
Rung động trong trục quay là một hiện tượng phổ biến thường gặp trong các hệ thống rotor. Việc xác định các yếu tố gây rung động để qua đó thực hiện các biện pháp giảm rung nhằm đảm bảo cho rotor vận hành ổn định là một trong những yêu cầu cấp thiết hiện nay. Trong bài báo này, một mô hình đánh giá rung động của rotor đã được thiết lập cho phép khảo sát các thông số chính ảnh hưởng đến rung động của rotor bao gồm tốc độ tới hạn, độ lệch tâm gây ra do mất cân bằng và góc pha ban đầu. Các kết quả thực nghiệm cho thấy: khi tốc độ quay gần tốc độ tới hạn sự rung động trở nên không ổn định và biên độ dao động tăng mạnh; lượng mất cân bằng tăng dẫn đến biên độ dao động tăng; góc pha ban đầu của vị trí đặt tải nếu bị thay đổi trong quá trình hoạt động sẽ dẫn đến các biến đổi khác nhau của giai đoạn rung động dẫn đến sự tăng hoặc giảm các ứng suất uốn có thể dẫn đến hiện tượng mỏi xuất hiện trên trục quay.
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