检索结果-南通市图书馆

An Investigation on the Formation of Submerged Bar Under Surges in Sandy Coastal Region

China Ocean Engineering 2012年第3期26卷 535-546页

作者： Mustafa DEMIRCI M.Sami akZ Civil Engineering Department Engineering FacultyMustafa Kemal UniversityskenderunHatay 31040Turkey Civil Engineering Department Engineering and Architecture Facultyukurova UniversityAdana 01100Turkey

Cross-shore sediment transport rate exposed to waves is very important for coastal morphology, the design of marine structures such as seawalls, jetties, breakwaters etc, and the prevention of coastal erosion and accretion due to onoff shore sediment transportation. In the present study, the experiments on cross-shore sediment transport are carried out in a laboratory wave channel with initial beach slopes of 1/8, 1/10 and 1/15. By using the regular waves with different deep-water wave steepnesses generated by a pedal-type wave generator, the geometrical characteristics of beach profiles under storm conditions and the parameters affecting on-off shore sediment transport are investigated for the beach materials with medium diameters of d50=0.25, 0.32, 0.45, 0.62 and 0.80 mm. The offshore bar geometric characteristics are the horizontal distances from the shoreline to the bar beginning （Xb）, crest （Xt）, and ending （Xs） points, the depth from the bar crest to the still water level （ht）, and the bar volume （Vbar）. The experimental results have indicated that when the deep-water steepness （Ha/L0） increased, the net movement to seaside increased. With the increasing wave steepness, the bars moved to widen herewith the vertical distances from still water level to the bar beginning （Xb）, crest （Xt） and ending （Xs） points and the horizontal distances from the coast line to the bar beginning, crest and ending points increased. It was also shown from experimental results that the horizontal distances from the bar beginning and ending points to the coast line increased with the decrease of the beach slope. The experimental results obtained from this study are compared with previous experimental work and found to be of the same magnitude as the experimental measurements and followed the expected basic trend.

关键词： cross-shore sediment transport beach profiles bar parameters experimental study

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Atypical respiratory complications of dengue fever

引用

Asian Pacific Journal of Tropical Medicine 2013年第10期6卷 839-840页

作者： Naveen Kumar ak Gadpayle Deepshikha Trisal Department of Medicine PGIMER & Dr Ram Manohar Lohia Hospital

In last decade,dengue has emerged as one of the most important vector born *** increasing cases,uncommon presentations and complications are now commonly ***,we report two cases of rare pattern of respiratory involvem... 详细信息

关键词： Respiratory complication Acute respiratory distress syndrome Viral bronchiolitis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Seed Priming with MgCl_(2),CaCl_(2),and ZnCl_(2) as a Biofortification Based-Approach Induces Changes in Anise Seedlings Emergence

引用

Phyton-International Journal of Experimental Botany 2023年第8期92卷 2461-2471页

作者： Sibel Day Nilüfer Koçak-Şahin Department of Field Crops Faculty of AgricultureAnkara UniversityAnkara06110Türkiye

Aromatic and medicinal plant species having small seeds haveﬁeld emergence problems due to low nutrient ***,Pimpinella anisum seeds were hydro and osmoprimed with 100 mM MgCl_(2),CaCl_(2),and ZnCl_(2),for 2,4,and 8 h each to compare their growth attributes during germination and seedling establishment *** seeds were used as *** hydro and osmo primed seeds were dried for 48 h before,they were sown in plastic trays in growth room conditions to see the impact of treatments on seedling emergence and *** maximum root length(12.90 cm),fresh weight(256.30 mg plant^(-1)),and mean emergence time(MET)were recorded from 8 h MgCl_(2) primed ***,the maximum(97.50,and 98.00%)emergence percentage was observed using 8 h MgCl_(2) primed seeds and nontreated seeds(control treatment).The evaluation of parameters like chlorophyll contents and electrical conductivity showed the 8 h MgCl_(2) priming as the optimum *** evaluation of parameters like chlorophyll contents and electrical conductivity showed the 8 h MgCl_(2) priming as the optimum *** result suggests MgCl_(2) priming worked synergistically and improved seed-ling growth attributes under greenhouse *** chlorophyll content ranged 25.94–35.69 SPAD *** highest chlorophyll content was obtained from the seedlings obtained from 4 h CaCl_(2) treatment,which were statistically similar to the chlorophyll contents of the seedlings obtained after 8 h MgCl_(2) treatment and nontreated seeds(control treatment).All other treatments showed inhibition in the chlorophyll contents and growth attributes of the *** conclusion,MgCl_(2) osmopriming treatments were signiﬁcantly promotive and better compared to hydro-priming and osmopriming treatments including control treatment in terms of anise seeds germination and emergence.

关键词： Pimpinella anisum L seed treatment hydropriming osmopriming electrolytes leakage

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A numerical technique based on collocation method for solving modified Kawahara equation

引用

Journal of Ocean Engineering and Science 2018年第1期3卷 67-75页

作者： Turgut ak S.Battal Gazi Karakoc Department of Transportation Engineering Yalova UniversityYalova77200 Turkey Department of Mathematics Faculty of Science and ArtNevsehir Haci Bektas Veli UniversityNevsehir50300 Turkey

In this article,a numerical solution of the modified Kawahara equation is presented by septic B-spline collocation *** the von-Neumann stability analysis,the present method is shown to be unconditionally stable.L 2 and L∞error norms and conserved quantities are given at selected *** accuracy of the proposed method is checked by test problems including motion of the single solitary wave,interaction of solitary waves and evolution of solitons.

关键词： Modified Kawahara equation Finite element method Collocation Solitary waves B-spline

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A novel indicator system for catalytic spectrophotometric determination and speciation of inorganic selenium species (Se(Ⅳ), Se(Ⅵ)) at trace levels in natural lake and river water samples

引用

Rare Metals 2011年第5期30卷 477-487页

作者： Ramazan Gürkan Halil brahim Ulusoy Mehmet akay Pinar Bulut Department of Chemistry Faculty of Science University of Cumhuriyet

A novel catalytic kinetic method is proposed for the determination of Se（Ⅳ）, Se（Ⅵ）, and total inorganic selenium in water based on the catalytic effect of Se（Ⅳ） on the reduction of Celestine blue by sodium sulfide at pH 7.0 phosphate buffer. The fixed-time method was adopted for the determination and speciation of inorganic selenium. Under the optimum conditions, the two calibration graphs are linear with a good correlation coefficient in the range 2-20 and 20-200 μg·L-1 of Se（Ⅳ） for the fixed-time method at 30℃. The experimental and theo- retical detection limits of the developed kinetic method were found to be 0.21 and 2.50 μg·L-1 for the fixed-time method （3 min）. All of the variables that affect the sensitivity at 645 nm were investigated, and the optimum conditions were established. The interference effect of various cations and anions on the Se（Ⅳ） determination was also studied. The selectivity of the selenium determination was greatly improved with the use of the strongly cation exchange resin such as Amberlite IR120 plus as long as chelating agents of thiourea and thiosulphate. The proposed kinetic method was validated statistically and through recovery studies in natural water samples. The relative standard deviations （RSDs） for ten replicate measurements of 2, 10, and 20 μg·L-1 of Se（Ⅳ） change between 0.35% and 5.58%, while the RSDs for ten replicate measurements of 3, 6, and 12 μg·L-1 of Se（Ⅵ） change between 0.49% and 1.61%. Analyses of a certified standard reference material （NIST SRM 1643e） for selenium using the fixed-time method showed that the proposed kinetic method has good accuracy. The Se（Ⅳ）, Se（Ⅵ）, and total inorganic selenium in lake and river water samples have been successfully determined by this method after selective reduction of Se（Ⅵ） to Se（Ⅳ）.

关键词： selenium speciation Celestine blue catalytic effect kinetic spectrophotometry natural waters

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Giant magnetocaloric effect in the Gd_5 Ge_(2.025)Si_(1.925)In_(0.05) compound

引用

Chinese Physics B 2010年第3期19卷 517-522页

作者： E.Yzak I.Dincer Y.Elerman Department of Engineering Physics Faculty of EngineeringAnkara University06100 BesevlerAnkaraTurkey

The magnetocaloric properties of the GdsGe2.025Si1.925In0.05 compound have been studied by x-ray diffraction, magnetic and heat capacity measurements. Powder x-ray diffraction measurement shows that the compound has a dominant phase of monoclinic Cd5Ge2Si2-type structure and a small quantity of Gds（Ge,Si）3-type phase at room temperature. At about 270 K, this compound shows a first order phase transition. The isothermal magnetic entropy change （△SM） is calculated from the temperature and magnetic field dependences of the magnetization and the temperature dependence of MCE in terms of adiabatic temperature change （△Tad） is calculated from the isothermal magnetic entropy change and the temperature variation in zero-field heat-capacity data. The maximum △SM is -13.6 J·kg^-1.K^- 1 and maximum ATad is 13 K for the magnetic field change of 0 5 T. The Debye temperature （θD） of this compound is 149 K and the value of DOS at the Fermi level is 1.6 states/*** from the low temperature zero-field heat-capacity data. A considerable isothermal magnetic entropy change and adiabatic temperature change under a field change of 0-5 T jointly make the Gd5Ge2.025Si1.925In0.05 compound an attractive candidate for a magnetic refrigerant.

关键词： magnetic properties magnetocaloric effect isothermal magnetic entropy change adia-batic temperature change

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Assessment of germ cell apoptosis in cryptorchid rats

引用

Asian Journal of Andrology 2002年第3期4卷 183-186页

作者： IzzetKoak MehmetDündar Mine Hekimgil Pinar Okyay Department of Urology Adnan Menderes University School of Medicine Aydin TurkeyDepartment of Urology Adnan Menderes University School of Medicine Aydin TurkeyDepartment of Pathology Ege University School of Medicine Izmir TurkeyDepartment of Public Health Adnan Menderes University School of Medicine Aydin Turkey

Aim: To investigate the relationship between germ cell degeneration and apoptosis in cryptorchid rats. Methods: Thirteen 21-day-old Wistar rats were made unilaterally cryptorchid by closing the left inguinal canal. At day 30 (Group 1, n=6) and day 60 (Group 2, n=7) after operation, the testes were removed for histopathological examination. The controls (n=8) were sham operated and were sacrificed at day 60. Germ cell apoptosis was assessed by means of the TUNEL method. Results: Spermatogenesis was arrested and the testicular and seminiferous tubular diameters were significantly reduced In the unilateral undescended testes (UUTs) compared with the contralateral descended testes (CDTs) and the control rats. However, atrophic changes, pathological calcification, necrosis of seminiferous tubule, and absence or sloughing of germ cells were not found in all the animals. The spermatocytes were the main type of germ cells undergoing apoptosis in all the groups. In the UUTs, there was a significant and time-dependent increase in the mean apoptotic index. By 60 days after surgery, increased apoptosis in germ cells was also observed in the CDTs. Conclusion: Apoptosis is the predominant mechanism of germ cell death rather than atrophy and necrosis in cryptorchidism.

关键词： cryptorchidism germ cells apoptosis TUNEL method

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

First record of Capnodium berberidis from India

引用

Studies in Fungi 2019年第1期4卷 37-42页

作者： Gautam ak Avasthi S School of Agriculture Faculty of ScienceAbhilashi UniversityMandi-175028India Department of Botany Abhilashi Post Graduate Institute of SciencesMandi-175008India

Capnodium berberidis,a sooty mould fungus,previously reported only from Pakistan in 1978,was recently observed on Berberis lycium in Jot Pass,district Chamba of Himachal Pradesh,*** lycium is a well-known small to medium sized spiny,woody,deciduous or evergreen medicinal and ornamental plant distributed throughout temperate and subtropical regions of the *** symptoms appeared as thin,black to dark brown,easily removed superficial layer of hyphae on various parts of host plant including leaves,stem,twigs and *** detailed studies on its morphology and taxonomy revealed it a sooty mould fungus Capnodium *** per literature consulted,this is the first report of Capnodium berberidis from India and probably second from world.

关键词： Berberis lycium black mildew Dothideomycetes Himachal Pradesh new record sooty moulds

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Production and characterization of ZnO nanoparticles and porous particles by ultrasonic spray pyrolysis using a zinc nitrate precursor

引用

International Journal of Minerals,Metallurgy and Materials 2012年第7期19卷 651-656页

作者： Burak Ebin Elif Arτg Burak zkal Sebahattin Gürmen Metallurgical & Materials Engineering Department Istanbul Technical University

ZnO nanoparticles and porous particles were produced by an ultrasonic spray pyrolysis method using a zinc nitrate precursor at various temperatures under air atmosphere. The effects of reaction temperature on the size and morphology of ZnO particles were investi- gated. The samples were characterized by energy dispersive spectroscopy, X-ray diffraction, transmission electron microscopy, and scanning electron microscopy. ZnO particles were obtained in a hexagonal crystal structure and the crystallite shapes changed from spherical to hex- agonal by elevating the reaction temperature. The crystallite size grew by increasing the temperature, in spite of reducing the residence time in the heated zone. ZnO nanoparticles were obtained at the lowest reaction temperature and ZnO porous particles, formed by aggregation of ZnO nanoparticles due to effective sintering, were prepared at higher temperatures. The results showed that the properties of ZnO particles can be controlled by changing the reaction temperature in the ultrasonic spray pyrolysis method.

关键词： zinc oxide nanoparticles nanocrystallites porous materials ultrasonic applications spray pyrolysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Preliminary pharmacological evaluation of Martynia annua Linn leaves for wound healing

引用

Asian Pacific Journal of Tropical Biomedicine 2011年第6期1卷 421-427页

作者： Santram Lodhi Singhai ak Department of Pharmaceutical Sciences Dr.H.S.Gour University SAGAR(M.P.)

Objective:To evaluate the wound healing potential of fractions from ethanol extract of Martynin annua(***) Linn ***:Ethanol extract of *** Linn leaves was fractionate into three different fractions(MAF-A,MAF-B and MAF-C) which were screened for wound healing potential using two models:excision and incision on *** thin layer chromatography(TLC) profile of all fractions were analysed and TLC of luteolin was also *** PovidoneIodine Ointment was used as reference for *** and incision wounds were created on dorsal portion of rats for *** contraction,biochemical parameters(protein level and hydroxyproline level) and histopathological study were performed in excision wound model whereas incision model was used for determination of tensile ***:The wound contraction and tensile strength of skin tissues were observed significantly greater in MAF-C fraction treated group than other two fractions(P<0.01).In excision wound method(on day 18) protein content and hydroxyproline were found significantly higher in MAF-C group than control group(P<0.01).Histopathological study also showed better angiogenesis,matured collagen fibres and fibroblast cells as compared with the control ***:In conclusion, our findings suggest that fiaction MAF-C from ethanol extract of *** leaves is found most effective in wound healing.

关键词： Martynia annua Wound healing Povidone-iodine ointment Incision Excision Luteolin TLC Wound contraction Tensile strength

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：