检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

铊-锗-硫三元素相平衡的实验研究

矿物学报 1993年第3期13卷 237-243页

作者：杨家(王余) Gunter h.moh 中国有色金属总公司矿产地质研究院桂林541004 联邦德国海德堡大学矿物岩石研究所

本文用抽真空石英管在干体系中对Tl-Ge-S三元系在300℃等温切面相关系和沿Tl_2-GeS_2及Tl_2-GeS变温切面假二元系相平衡进行了实验研究。 Tl-Ge-S三元系在300℃为三个液相区与三个二元相、八个三元相(包括三个固溶体)和十四个两相区、... 详细信息

本文用抽真空石英管在干体系中对Tl-Ge-S三元系在300℃等温切面相关系和沿Tl_2-GeS_2及Tl_2-GeS变温切面假二元系相平衡进行了实验研究。 Tl-Ge-S三元系在300℃为三个液相区与三个二元相、八个三元相(包括三个固溶体)和十四个两相区、二十四个三相区稳定共存的复杂相关系。本实验首次合成了三个三元相(Tl_2Ge_(1-x)S_2、Tl_5Ge_(13)S_(24)、TlGe_3S_5)和三个固溶体相,即S·S·a(Tl_2^+Ge^(4+)S_3～Tl_2^+Ge_2^(2+)S_3)、S·S·b(Tl^+Ge_(0.5)^(2+)Ge_(0.5)^(4+)S_2～Tl^+Ge_3^(2+)S_4),S·S·c(Tl^+Ge_2^(2+)S_3～Tl_2^+Ge_5S_6)。

关键词：矿物相平衡铊锗硫酸盐

在线全文

学校读者我要写书评

暂无评论

Tl—Ga—S三元系的合成实验研究

岩石矿物学杂志 1993年第1期12卷 40-44页

作者：徐珏 Günter h.moh 中国地质科学院矿床地质研究所北京100037 德国海德堡大学

作者系统地进行了Tl—Ga—S三元系的合成实验研究。在300℃等温面上,发现了四个新相,Tl_4GaS_5为三元纯相,Ⅰ、Ⅱ、Ⅲ为固溶体相区,其成分变化范围分别是:(Ⅰ)Tl_(20)GaS_(16)—Tl_(20)Ga_2S_(17),(Ⅱ)Tl_(10)Ga_6S_(17)—Tl_5Ga_3S_7,(Ⅲ)Tl_2Ga_2S_5—TlGaS_2。此外,在630—900℃还存在一个成分为TlGa_5S_8—Tl_2Ga_(10)S_(11)的固溶体相。对这些新相均进行了X-射线粉晶衍射、光性及某些物性测试。X-射线粉晶衍射数据已进行了指标化。

关键词：铊镓硫三元素合成固溶体相

Comparison among the UECM Model, and the Composite Model in Forecasting Malaysian Imports

在线全文

学校读者我要写书评

暂无评论

Open Journal of Statistics 2024年第2期14卷 163-178页

作者： mohamed A. h. Milad hanan moh. B. Duzan Libyan Authority and Science Research Tripoli Libya The higher Institute of Science and Technology-Souq Algoma Tripoli Libya

For more than a century, forecasting models have been crucial in a variety of fields. Models can offer the most accurate forecasting outcomes if error terms are normally distributed. Finding a good statistical model for time series predicting imports in Malaysia is the main target of this study. The decision made during this study mostly addresses the unrestricted error correction model (UECM), and composite model (Combined regression—ARIMA). The imports of Malaysia from the first quarter of 1991 to the third quarter of 2022 are employed in this study’s quarterly time series data. The forecasting outcomes of the current study demonstrated that the composite model offered more probabilistic data, which improved forecasting the volume of Malaysia’s imports. The composite model, and the UECM model in this study are linear models based on responses to Malaysia’s imports. Future studies might compare the performance of linear and nonlinear models in forecasting.

关键词： Composite Model UECM ARIMA Forecasting Malaysia

Gold nanoparticles film for Q-switched pulse generation in thulium doped fiber laser cavity

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

Optoelectronics Letters 2021年第8期17卷 449-453页

作者： Ahmad h.A.Rosol Afiq A.A.Jafry Norrima Mokhtar moh Yasin Sulaiman Wadi harun Department of Electrical Engineering University of MalayaKuala Lumpur 50603Malaysia Department of Physics Faculty of ScienceUniversiti Teknologi MalaysiaSkudai 81310Malaysia Department of Physics Faculty of Science and TechnologyAirlangga UniversitySurabayaIndonesia

Passively Q-switched thulium doped fiber laser(TDFL)has been successfully demonstrated using gold nanoparticles(GNPs),which were embedded into polyvinyl alcohol as saturable absorber(SA).The stable self-starting Q-switched laser was generated to operate at 1891 nm when a tiny piece of the prepared film was slot in between two fiber ferrules and incorporated into the laser *** repetition rate can be adjusted from 48.54 khz to 49.64 khz while the pulse width decreased from 3.52μs to 2.38μs with the increase of 1550 nm pump power from 840 m W to 930 m *** corresponding pump power output power linearly increased from 3.62 m W to 6.3 m W with a slope efficiency of 2.53%.The maximum peak power and pulse energy were recorded at about 39 m W and 0.12μJ,respectively at pump power of 930 m *** Q-switching operation was caused by the surface plasmon resonance absorption of GNPs.

关键词： switched fiber pump

Vanadium pentoxide film for microsecond pulse generation in 1.5-μm region

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2022年第1期18卷 29-34页

作者： mohamad F.Baharom Salam M.Azooz Ahmad h.A.Rosol moh Yasin Sulaiman Wadi harun Department of Electrical Engineering University of MalayaKuala Lumpur 50603Malaysia Department of Communication Engineering Engineering Technical CollegeAl-Furat Al-Awsat Technical UniversityNajafIraq Department of Physics Faculty of Science and TechnologyAirlangga UniversitySurabaya 60115Indonesia

Q-switched erbium doped fiber laser(EDFL)was passively realized using vanadium pentoxide(V_(2)O_(5))embedded into polyethylene glycol(PEG)film as saturable absorber(SA).The laser could successfully generate stable self-starting pulses when the V_(2)O_(5)film was placed in an EDFL *** operated at 1562.4 nm *** repetition rate can be varied from 91.7 khz to 128.2 khz while the pulse width shrank from 10.90μs to 7.81μs with rising pump power from 110.9 mW to 166.5 *** pulse energy recorded was 3.2 nJ at pump power of 166.5 *** results indicate that the saturable absorption of V_(2)O_(5)has promising nonlinear photonic applications especially in fiber laser development for 1.5-μm region.

关键词： pulse pump fiber

在线全文

学校读者我要写书评

暂无评论

Tl-In-S三元系的实验研究

地质论评 1993年第3期39卷 231-235页

作者：徐珏 Günter.h.moh 中国地质科学院矿床地质研究所海德堡大学矿物岩石研究所

作者通过T1—In-S三元系实验研究,在300℃等温面上发现4个三元固溶体相和2个三元相。4个三元固溶体相的成分变化范围分别是:(Ⅰ)T1_(2C)InS_(16)-T1_(40)In_3S_(33);(Ⅱ)T1_4InS_5—T1_4InS_4;(Ⅲ)T1_8In_2S_7—T1_(15)In_3S_(11)和(Ⅳ)T1_2In_2S_5。2个三元相的成分分别是T1_3InS_3和T1_2In_2S_3。这些相之间的关系清楚地示于T1-In-S相图中。此外,在600℃时合成了三元相T1In_2S_3,并对前人的实验研究进行了补充和修正。

关键词：钛铟硫三元系合成实验相图

Q-switched pulse generation in a bidirectionally pumped EDFL utilizing Lu_(2)O_(3) as saturable absorber

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2021年第9期17卷 529-533页

作者： Nur F.Zulkipli Ahmad h.A.Rosol Sheriff A.Sadik Firat E.Durak Ahmet Altuncu moh Yasin Sulaiman W.harun Department of Electrical Engineering University of MalayaKuala Lumpur 50603Malaysia Photonics Technologies Application and Research Center(FOTAM) Kütahya Dumlupinar UniversityKiltahya 43100Turkey Department of Physics Faculty of Science and TechnologyAirlangga UniversitySurabayaIndonesia

In this paper,we have successfully demonstrated a Q-switched pulse generation utilizing lutetium oxide(Lu2O3)thin film based saturable absorber(SA)in all-fiber erbium-doped fiber laser(EDFL)cavity with a bidirectional *** Lu2O3 powder is mixed with isopropyl alcohol(IPA)solution before we add polyvinyl alcohol(PVA)as our host polymer to make the Lu2O3 into a thin *** inserting the Lu2O3-PVA thin film into a bidirectional pumped EDFL cavity,a stable Q-switched pulse is realized with repetition rate in a range of rose from 43.67 k hz to 57.74 k hz whereas the pulse width decreased from 14.48μs to 11.20μ*** result indicates that the Lu2O3 can be implemented as an SA device in an EDFL as it owns a linear absorption of around 3 d B at 1567 nm.

关键词： switched pumped pulse

8-hQCdCl_(2)h_(2)O as an organic Q-switcher in erbium laser cavity

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2023年第11期19卷 681-685页

作者： MUSTAFA mohAMMED NAJM mohAMMED NAJM ABDULLAh AYA A.ALMUKhTAR BELAL AhMED hAMIDA moh YASIN SULAIMAN WADI hARUN Department of Electrical Engineering Universiti MalayaKuala Lumpur50603Malaysia Department of Computer Engineering University of TechnologyBaghdadIraq Medical Instrumentation Engineering Department Al-Esraa University CollegeBaghdadIraq Department of Electrical and Computer Engineering International Islamic University MalaysiaGombakMalaysia Department of Physics Faculty of Science and TechnologyAirlangga UniversitySurabayaIndonesia Research Center for Biophotonics(RCB) Airlangga UniversitySurabaya60115Indonesia

This paper demonstrated a Q-switched erbium-doped fiber laser(EDFL)using an organic saturable absorber(SA)based on 8-hQCdCl_(2)h_(2)O *** organic thin film was prepared using the casting *** proposed Q-switched EDFL has a maximum repetition rate of 143 khz,minimum pulse duration of 1.85μs and the highest pulse energy of 167 *** Q-switched peak laser was at a central wavelength of 1531 nm with a 3 dB bandwidth of 3.52 nm and power intensity of 2.64 dBm.

关键词： switched laser material

ThE F-2 REGION OF ThE IONOSPhERE AT WUChANG DURING ThE SOLAR ECLIPSE OF MAY 9, 1948

在线全文

学校读者我要写书评

暂无评论

中国物理学报 1951年第3期 197-206页

作者： C.T.KWEI P.h.LIANG J.h.moh W.ChOW Ionosphere Laboratory Wuhan University Wuchang Wuchang at the Institute of Geophysics and Mctcorology Academia Sinica

From data obtained during the eclipse and on control days,the effective coefficient of recombinationfor F-2 layer is found to be 4×10-10cm3/electron per *** magnitude of α is apparently afunction of the height of the layer which becomes lower with increasing *** eruptionsmay be associated with two of the discontinuities of the eclipse *** thickness of the F-2 layerbecame compressed and dropped as a whole during the eclipse,possibly due to air movement causedby lowering of *** sporadic E layer was not influenced by the change of solar radiation,and must be due to other causes.

关键词： ThE F-2 REGION OF ThE IONOSPhERE AT WUChANG DURING ThE SOLAR ECLIPSE OF MAY 9,1948 AT