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Holographic heat engine in Horndeski model with the k-essence sector
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作者 ShiQian Hu XiaoMei Kuang 《中国科学:物理学、力学、天文学英文版》 SCIE EI CAS CSCD 2019年第6期21-26,共6页
This study aims to analyze the extended thermodynamical properties of the charged black hole in Horndeski theory with the k-essence sector. Herein, we define a holographic heat engine using the anti de Sitter black ho... This study aims to analyze the extended thermodynamical properties of the charged black hole in Horndeski theory with the k-essence sector. Herein, we define a holographic heat engine using the anti de Sitter black hole. We then estimate the engine efficiency in high-temperature limit and compare the result with the exact result. With the given specified parameters in a rectangular engine, high order coupling suppresses the engine efficiency. 展开更多
关键词 anti de SITTER BLACK HOLE THERMODYNAMICS of BLACK HOLE HOLOGRAPHIC heat engine
Slaughtering Performance and Meat Quality of Hainan Black Goat and Its Hybrid Offsprings with Nubian Black Goat 预览
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作者 Wei Limin Sun Ruiping +6 位作者 Liu Yan Liu Ruina Liu Quanwei Zheng Xinli Wang Feng Huang Lili Xing Manping 《动物与饲料科学:英文版》 CAS 2019年第2期49-52,共4页
In order to compare the slaughter performance and meat quality of Hainan black goats and hybrid offsprings of Nubian Black Goat and Hainan Black Goat, six 7-month-old Hainan black goats and six hybrid offsprings were ... In order to compare the slaughter performance and meat quality of Hainan black goats and hybrid offsprings of Nubian Black Goat and Hainan Black Goat, six 7-month-old Hainan black goats and six hybrid offsprings were selected to determine slaughter performance and muscle quality. The results showed that hybridization of Nubian black goat and Hainan black goat significantly improved the production performance and slaughter performance of hybrid offsprings (P>0.05). The meat quality of F1 hybrid black goat had no significant difference with that of Hainan black goat except for the hardness and elasticity (P<0.05). Therefore, the crossbred progenies of Nubian black goat and Hainan black goat have advantages in meat yield and meat performance, and the main meat quality indexes are not significantly different, which meets the market requirements for high-yield and high-quality hybrid combinations, and can be used for cross promotion. 展开更多
关键词 HAINAN BLACK Goats Nubian BLACK Goats HYBRID OFFSPRING SLAUGHTER PERFORMANCE Meat quality
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Charged scalar fields in a Kerr-Sen black hole:exact solutions, Hawkingradiation, and resonant frequencies
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作者 H.S.Vieira V.B.Bezerra 《中国物理C:英文版》 SCIE CAS CSCD 2019年第3期91-98,共8页
In this study, we consider charged massive scalar fields around a Kerr-Sen spacetime. The radial and angular parts of the covariant Klein-Gordon equation are solved in terms of the confluent Heun function. From the ex... In this study, we consider charged massive scalar fields around a Kerr-Sen spacetime. The radial and angular parts of the covariant Klein-Gordon equation are solved in terms of the confluent Heun function. From the exact radial solution, we obtain the Hawking radiation spectrum and discuss its resonant frequencies. The massless case of the resonant frequencies is also examined. 展开更多
关键词 KLEIN-GORDON equation CHARGED and rotating BLACK HOLE heterotic string field theory confluent Heun function BLACK HOLE physics
FIRST IMAGE OF BLACK HOLE
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《北京周报:英文版》 2019年第16期3-5,共3页
The first-ever image of a supermassive black hole at the heart of the distant galaxy Messier 87 is unveiled during a press conferenee held by the Shanghai Astronomical Observatory on April 10. The image, based on obse... The first-ever image of a supermassive black hole at the heart of the distant galaxy Messier 87 is unveiled during a press conferenee held by the Shanghai Astronomical Observatory on April 10. The image, based on observations from the Event Horizon Telescope, a planet-scale array of eight ground-based radio telescopes created by in ternational collaboration of over 200 scientists for years, was released during coordinated press conferences across the globe at 9:00 p.m., Beijing time. 展开更多
关键词 FIRST IMAGE BLACK HOLE supermassive BLACK HOLE
Thermodynamics and weak cosmic censorship conjecture of BTZ black holes in extended phase space
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作者 曾晓雄 韩亦文 陈德友 《中国物理C:英文版》 SCIE CAS CSCD 2019年第10期112-117,共6页
As a charged fermion drops into a BTZ black hole, the laws of thermodynamics and the weak cosmic censorship conjecture are investigated in both the normal and extended phase space, where the cosmological parameter and... As a charged fermion drops into a BTZ black hole, the laws of thermodynamics and the weak cosmic censorship conjecture are investigated in both the normal and extended phase space, where the cosmological parameter and renormalization length are regarded as extensive quantities. In the normal phase space, the first and second law of thermodynamics, and the weak cosmic censorship are found to be valid. In the extended phase space, although the first law and weak cosmic censorship conjecture remain valid, the second law is dependent on the variation of the renormalization energy dK. Moreover, in the extended phase space, the configurations of extremal and near-extremal black holes are not changed, as they are stable, while in the normal phase space, the extremal and near-extremal black holes evolve into non-extremal black holes. 展开更多
关键词 WEAK COSMIC CENSORSHIP CONJECTURE THERMODYNAMICS BTZ black holes
Phosphorene: Current status, challenges and opportunities
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作者 Anandarup Goswami Manoj B.Gawande 《化学科学与工程前沿:英文版》 EI CAS CSCD 2019年第2期296-309,共14页
The field of 2-dimensional (2D) materials has witnessed a sharp growth since its inception and can majorly be attributed to the substantial technical and scientific developments, leading to significant improvements in... The field of 2-dimensional (2D) materials has witnessed a sharp growth since its inception and can majorly be attributed to the substantial technical and scientific developments, leading to significant improvements in their syntheses, characterization and applications. In the list of 2D materials, the relatively newer addition is phosphorene, which ideally consists of a single layer of black phosphorous. Keeping in mind the past, and ongoing research activities, this short account offers a brief overview of the present status and the associated challenges in the field of phosphorene-related research, with special emphasis on their syntheses, properties, applications and future opportunities. 展开更多
关键词 phosphorene black phosphorous ANISOTROPY single layer THERMOELECTRIC chemical vapor DEPOSITION CATALYSIS BATTERY SUPERCAPACITOR
Cimicifuga heracleifolia is therapeutically similar to black cohosh in relieving menopausal symptoms: evidence from pharmacological and metabolomics studies
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作者 MIAO Lan-Yun CHU Thi Thanh Huyen +2 位作者 LI Ping JIANG Yan LI Hui-Jun 《中国天然药物:英文版》 SCIE CAS CSCD 2019年第6期435-445,共11页
In the market of botanical dietary supplements, Cimicifuga heracleifolia(CH) has always been considered as an adulterated species of Cimicifuga racemosa(CR), a conventional American herb with promising benefits to cou... In the market of botanical dietary supplements, Cimicifuga heracleifolia(CH) has always been considered as an adulterated species of Cimicifuga racemosa(CR), a conventional American herb with promising benefits to counteract troubles arising from the menopause. However, the detailed comparison of their therapeutic effects is lacking. In present study, the pharmacological and metabolomics studies were comparatively conducted between CH and CR in ovariectomized(OVX) female rats. Specifically, estrogen-like, anti-hyperlipidemia and anti-osteoporosis effects were evaluated through measuring serum biochemical parameters, histopathological examination and micro computed tomography(Micro-CT) scanning. At the same time, a gas chromatography-mass spectrometry(GC-MS)-based serum metabolomics method was employed to profile the metabolite compositional changes. As a result, both CR and CH displayed anti-osteoporosis and anti-hyperlipemia on menopause syndrome. Meanwhile, their potentials in improving the OVX-induced metabolic disorders were discovered. In conclusion, these results demonstrated that CH is therapeutically similar to CR in relieving menopausal symptoms and CH could be considered as a promising alternative to CR instead of an adulterant in the market of botanical dietary supplements. 展开更多
关键词 CIMICIFUGA heracleifolia BLACK cohosh MENOPAUSAL SYMPTOMS Metabolomics SUBSTITUTE
Fumigant toxicity and sublethal effects of Teucrium polium essential oil on Aphis fabae scopoli A
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作者 Sultan Ravan Abbas Khani Sedigheh Sufi 《中草药:英文版》 CAS 2019年第2期231-235,共5页
Objective: Black bean aphid(Aphis fabae) is one of the most important greenhouse and crop pests with a wide range of hosts, which causes damages through feeding on vegetable sap and transmitting viral diseases. Curren... Objective: Black bean aphid(Aphis fabae) is one of the most important greenhouse and crop pests with a wide range of hosts, which causes damages through feeding on vegetable sap and transmitting viral diseases. Currently, chemical methods are mainly used to control this pest. Considering the adverse effects of pesticides, it is essential to apply less chemical pesticide in pest control programs. The lethal and sublethal effects of the essential oil(EO) of Teucrium polium leaves on one-day-old adults of black bean aphid were investigated under laboratory conditions.Method: The bioassay was evaluated at the concentrations of 0.88-12 μL/L air, for 24 h after treatment.Reproductive life table parameters of new emerged aphid surveyed at sub-lethal concentrations(LC20 and LC40) of EO and the biological reproductive table was calculated by Jackknife method.Results: The mortality rate increased significantly with the increasing of EO concentration. The estimated LC50 value was 4.5 μL/L air. Laboratory exposure to sublethal concentrations of EO caused significant decrease in adult female longevity and fertility of surviving aphids and as a result caused significant reduction in the intrinsic rate of natural increase(rmvalue).Conclusion: The results of this study revealed that EO of T. polium could be used as a potential control agent for the aphid. 展开更多
关键词 black BEAN APHID FUMIGANT toxicity HERBAL essential oil SUBLETHAL effect TEUCRIUM polium L.
Characterization of SOX3 Gene in an Ovoviviparous Teleost,Black Rockfish(Sebastes schlegeli) 预览
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作者 MA Liman WANG Wenji +3 位作者 SHANG Renjie ZHANG Quanqi QI Jie WANG Zhigang 《中国海洋大学学报:英文版》 SCIE CAS CSCD 2019年第2期431-440,共10页
Evolutionary evidence suggests that Sox3,a member of the high-mobility-group(HMG)family of transcription factors,is an ancestral precursor of Sry and is involved in sex determination similar to Sry.However,there is li... Evolutionary evidence suggests that Sox3,a member of the high-mobility-group(HMG)family of transcription factors,is an ancestral precursor of Sry and is involved in sex determination similar to Sry.However,there is limited information regarding the SOX3 gene of the black rockfish(Sebastes schlegeli).In this study,we first isolated SOX3 gene from the gonads of S.schlegeli by homology cloning.The full-length of S.schlegeli SOX3(SsSOX3)cDNA was 1386 bp,comprising a 906-bp open reading frame,which encodes a peptide showing 93.6%and 93.9%homology with the Sox3 proteins of Epinephelus coioides and Oryzias latipe,respectively.Comparison of the cDNA sequence of the SsSOX3 gene with the corresponding genomic DNA fragment revealed that the SsSOX3 gene consists of a single exon.Phylogenetic analysis demonstrated the evolutionary relationship of SsSOX3 with other known SOXB1 genes in fish and tetrapods.The promoter region contains binding sites of several transcriptional factors that might participate in the regulation of SsSOX3 expression.Quantitative real-time PCR analysis indicated that SsSOX3 was expressed in all the investigated larval developmental stages from 1 to 35 days after birth and the level of expression gradually decreased as the development proceeded.SsSOX3 exhibited sexually dimorphic expression in adult gonads,with high expression in the ovary but low expression in the testis.In situ hybridization revealed that SsSOX3 was strongly expressed in oocytes and follicular cells of ovaries but slightly expressed in germ cells of testicular tissues.Therefore,this study suggests that SsSOX3 plays an important role in oogenesis and ovary differentiation in S.schlegeli. 展开更多
关键词 black ROCKFISH PROMOTER analysis SEBASTES schlegeli SEX determination sexual DIFFERENTIATION SOX3
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Thermal conductivity of natural rubber nanocomposites with hybrid fillers
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作者 Junping Song Xiteng Li +3 位作者 Kaiyan Tian Lianxiang Ma Wei Li Shichune Yao 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2019年第4期928-934,共7页
Natural rubber nanocomposites filled with hybrid fillers of multi-walled carbon nanotubes(CNTs) and carbon black(CB) were prepared. CNTs were ultrasonically modified in mixture of hydrogen peroxide(H2O2) and distilled... Natural rubber nanocomposites filled with hybrid fillers of multi-walled carbon nanotubes(CNTs) and carbon black(CB) were prepared. CNTs were ultrasonically modified in mixture of hydrogen peroxide(H2O2) and distilled water(H2O). The functional groups on the surface of CNTs, changes in nanotube structure and morphology were characterized by Fourier transform infrared spectroscopy(FT-IR), Raman Spectroscopy, and transmission electron microscopy(TEM). It shows that hydroxyl(OH·) is successfully introduced. The surface defects of modified CNTs were obviously higher than those of original CNTs, and the degree of agglomeration was greatly reduced. Thermal conductivity of the composites was tested by protection heat flow meter method. Compared with unmodified CNTs/CB filling system, the thermal conductivity of hybrid composites is improved by an average of 5.8% with 1.5 phr(phr is parts per hundred rubber) of hydroxyl CNTs and 40 phr of CB filled. A three-dimensional heat conduction network composed of hydroxyl CNTs and CB, as observed by TEM, contributes to the good properties. Thermal conductivity of the hybrid composites increases as temperature rises. The mechanical properties of hybrid composites are also good with hydroxyl CNTs filled nanocomposites;the tensile strength, 100% and 300% tensile stress are improved by 10.1%, 22.4% and 26.2% respectively. 展开更多
关键词 Modified CARBON NANOTUBE CARBON black HYBRID FILLER Natural rubber Thermal CONDUCTIVITY
Entropy of Vaidya Black Hole on Event Horizon with Generalized Uncertainty Principle Revisited
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作者 唐浩 吴滨 +1 位作者 岳瑞宏 孙成一 《理论物理通讯:英文版》 SCIE CAS CSCD 2019年第1期75-78,共4页
In this note, we recalculate the entropy of the Vaidya black hole on the event horizon by considering the generalized uncertainty principle based on the brick-wall model. The result shows that we need not impose a cut... In this note, we recalculate the entropy of the Vaidya black hole on the event horizon by considering the generalized uncertainty principle based on the brick-wall model. The result shows that we need not impose a cut-off by hand anymore and the result satisfies the Bekenstein-Hawking law as well. 展开更多
关键词 ENTROPY black HOLE GENERALIZED UNCERTAINTY PRINCIPLE brick-wall model MINIMAL length
Opening a New Chapter
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作者 Li Xiaoyang 《北京周报:英文版》 2019年第22期22-23,共2页
When Wang Xiaobo(1952-97)wrote about his dream of visiting an Egyptian desert in his novella The Silver Age in the 1990s,the Chinese writer perhaps did not imagine he would become a rage in that country decades later.... When Wang Xiaobo(1952-97)wrote about his dream of visiting an Egyptian desert in his novella The Silver Age in the 1990s,the Chinese writer perhaps did not imagine he would become a rage in that country decades later.“You may not believe this but the most popular contemporary Chinese writer in Arabic-speaking countries today is Wang Xiaobo,”said Ahmed Mohamed Elsaid Soliman,General Manager of Egypt's Wisdom House Cultural Investment Co.,talking of the writer known for his allegorical style and black humor. 展开更多
关键词 WHEN WANG Xiaobo his DREAM of visiting black HUMOR
Entropy Quantization of Schwarzschild Black Hole
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作者 M.Atiqur Rahman 《理论物理通讯:英文版》 SCIE CAS CSCD 2019年第3期307-311,共5页
The surface gravity of Schwarzschild black hole can be quantized from the test particle moving around different energy states analog to the Bohr’s atomic model. We have quantized the Hawking temperature and entropy o... The surface gravity of Schwarzschild black hole can be quantized from the test particle moving around different energy states analog to the Bohr’s atomic model. We have quantized the Hawking temperature and entropy of Schwarzschild black hole from quantization of surface gravity. We also have shown that the change of entropy reduces to zero when the boundary shrinks to very small size. 展开更多
关键词 Hawking TEMPERATURE ENTROPY SCHWARZSCHILD BLACK HOLE
A Modified Gravity Theory: Null Aether
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作者 Metin Gurses Cetin Senturk 《理论物理通讯:英文版》 SCIE CAS CSCD 2019年第3期312-326,共15页
General quantum gravity arguments predict that Lorentz symmetry might not hold exactly in nature. This has motivated much interest in Lorentz breaking gravity theories recently. Among such models are vector-tensor the... General quantum gravity arguments predict that Lorentz symmetry might not hold exactly in nature. This has motivated much interest in Lorentz breaking gravity theories recently. Among such models are vector-tensor theories with preferred direction established at every point of spacetime by a fixed-norm vector field. The dynamical vector field defined in this way is referred to as the "aether". In this paper, we put forward the idea of a null aether field and introduce, for the first time, the Null Aether Theory(NAT)- a vector-tensor theory. We first study the Newtonian limit of this theory and then construct exact spherically symmetric black hole solutions in the theory in four dimensions, which contain Vaidya-type non-static solutions and static Schwarzschild-(A)dS type solutions, Reissner-Nordstr?m-(A)dS type solutions and solutions of conformal gravity as special cases. Afterwards, we study the cosmological solutions in NAT:We find some exact solutions with perfect fluid distribution for spatially flat FLRW metric and null aether propagating along the x direction. We observe that there are solutions in which the universe has big-bang singularity and null field diminishes asymptotically. We also study exact gravitational wave solutions - AdS-plane waves and pp-waves - in this theory in any dimension D ≥ 3. Assuming the Kerr-Schild-Kundt class of metrics for such solutions, we show that the full field equations of the theory are reduced to two, in general coupled, differential equations when the background metric assumes the maximally symmetric form. The main conclusion of these computations is that the spin-0 aether field acquires a "mass" determined by the cosmological constant of the background spacetime and the Lagrange multiplier given in the theory. 展开更多
关键词 Aether theory NEWTONIAN limit black holes COSMOLOGICAL solutions Kerr-Schild-Kundt class of metrics Ads-plane WAVES pp-waves
我的趣味字典
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作者 李泽言 沈阿希(画) 《英语角》 2019年第8期40-41,共2页
大衣词性:名词The black overcoatsuits her well.这件黑色大衣很适合她。
关键词 字典 趣味 BLACK The 大衣 名词
The Political Messages Embodied in Marvel’s Film Black Panther 预览
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作者 ZHANG Juan 《文学与艺术研究:英文版》 2019年第7期784-789,共6页
Black Panther is the first superhero film in Marvel’s history that is directed and acted predominantly by African-American artists.The complementary academic review,high box office and audience rating are highly attr... Black Panther is the first superhero film in Marvel’s history that is directed and acted predominantly by African-American artists.The complementary academic review,high box office and audience rating are highly attributed to the political elements embodied in the movie.A breakthrough is achieved in the conventional cinematic image of the African-American man through the creation of a black hero playing the role of world savior.It also presents a prosperous and advanced image of Africa,fulfilling and expanding the African-American people’s imagination of their spiritual home.Moreover,in responding to the Black Panther movement in black history,the film implicitly explores three possible routes of struggle for the black ethnic group and conveys a political message to the audience. 展开更多
关键词 BLACK PANTHER superhero FILM AFRICAN-AMERICAN POLITICS
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Effect of Pelleted Total Mixed Ration on Production Performance and Serum Biochemical Index of Growing Hainan Black Goats 预览
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作者 Liu Quanwei Wang Feng +4 位作者 Wei Limin Huang Lili Sun Ruiping Xing Manping Zheng Xinli 《动物与饲料科学:英文版》 CAS 2019年第1期19-22,31共5页
[Objective] The paper was to investigate effects of pelleted total mixed ration on production performance and serum biochemical index of growing Hainan black goats.[Method] Twenty-four growing Hainan black goats with ... [Objective] The paper was to investigate effects of pelleted total mixed ration on production performance and serum biochemical index of growing Hainan black goats.[Method] Twenty-four growing Hainan black goats with the same genetic backgrounds and similar initial weight of(10.05±0.049) kg were randomly assigned into two treatments, and supplied with Juncao + concentrate(control group), pelleted total mixed ration(experimental group), respectively. The trial lasted 50 d.[Result] The final weight, daily gain and feed intake of experimental group were significantly higher than those of control group(P<0.05), but the feed/gain ratio of experimental group was markedly lower than that of control group(P<0.05). Compared with the control group, the gross profit of experimental group significantly increased( P <0.05).[Conclusion] Pelleted total mixed ration led to better production performance of growing Hainan black goat. 展开更多
关键词 GROWING HAINAN black GOAT Pelleted total mixed RATION Production performance SERUM BIOCHEMICAL parameters
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Effect of Pelleted Total Mixed Ration of Different Particle Sizes on Production Performance and Serum Biochemical Index of Fattening Hainan Black Goats 预览
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作者 Liu Quanwei Wei Limin +4 位作者 Wang Feng Tan Shuyi Sun Ruiping Huang Lili Zheng Xinli 《动物与饲料科学:英文版》 CAS 2019年第1期23-27,共5页
[Objective] The paper to investigate the effects of pelleted total mixed ration of different particle size on production performance and serum biochemical index of fattening Hainan black goats.[Method] Thirty-six fatt... [Objective] The paper to investigate the effects of pelleted total mixed ration of different particle size on production performance and serum biochemical index of fattening Hainan black goats.[Method] Thirty-six fattening Hainan black goats with the same genetic backgrounds and similar initial weight of(19.02±0.22) kg were randomly divided into three treatments. Goats were fed with Juncao+concentrate(control group), pel-leted total mixed ration I(particle size 6 mm, experimental group I) and II(particle size 5 mm, experimental group II), respectively. The trial lasted 45 d.[Result](1) The final weight and daily gain of experimental group II were significantly higher than those of control group( P<0.05), and the daily gain of experimental group II was also higher than that of experimental group I(P<0.05);the feed intake of experimental group II was markedly higher than that of control group(P<0.05), but was significantly lower than that of experimental group I(P<0.05). The feed/gain ratio of experimental group II was significantly lower than those of control group and experimental group I(P<0.05).(2) The feed gain cost of experimental group II was markedly lower than that of control group(P<0.05), but the gross profit was significantly higher than those of control group and experimental group I(P<0.05).(3) Compared with the control group, the serum total protein content of experimental group II increased markedly( P<0.05) while the urea nitrogen level decreased(P>0.05).[Conclusion] The pelleted total mixed ration with the particle size of 5 mm obtained better fattening ef-fect, and obviously improved the serum total protein level. 展开更多
关键词 FATTENING HAINAN black GOAT Pelleted total mixed RATION Particle size Production performance SERUM BIOCHEMICAL parameters
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The surface current method in gray Dancoff factor calculation 预览
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作者 Omid Safarzadeh 《核技术:英文版》 SCIE CAS CSCD 2019年第6期28-34,共7页
The Dancoff correction is important in the calculation of the effective cross section of resonant isotopes in a heterogeneous system. Although the neutron current method is a simple and straightforward approach to est... The Dancoff correction is important in the calculation of the effective cross section of resonant isotopes in a heterogeneous system. Although the neutron current method is a simple and straightforward approach to estimate the Dancoff factor, its use is limited to the black Dancoff factor. In this paper, we expand the current method used to determine both the black and gray Dancoff factors. The method developed also relies on a neutron transport solver, where a fixed source on a fuel rod surface has an outward direction, a cosine distribution, and a constant shape. The detector is located on the surface of the rods to measure incoming and outgoing currents;therefore, there is no need to calculate the chord length, and the development, validation, and verification of the code can be omitted. The mathematical foundation of the suggested method is derived using the integral transport equation. The effects of the moderator and lattice configuration are followed by a sensitivity analysis of the Dancoff factor for several problems, including pressurized water reactor and cluster fuel assemblies. The maximum and average relative errors of the calculated results are approximately 0.3% and 0.05%, respectively. 展开更多
关键词 BLACK Dancoff GRAY Dancoff INTEGRAL TRANSPORT EQUATION Interface current TRANSPORT SOLVER
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Simple black holes with anisotropic fluid
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作者 Inyong Cho Hyeong-Chan Kim 《中国物理C:英文版》 SCIE CAS CSCD 2019年第2期125-131,共7页
We study a spherically symmetric spacetime made of an anisotropic fluid whose radial equation-of-state is given by p1=-ρ. This case allows analytic solutions and is a good example for studying the static configuratio... We study a spherically symmetric spacetime made of an anisotropic fluid whose radial equation-of-state is given by p1=-ρ. This case allows analytic solutions and is a good example for studying the static configuration of a black hole plus matter. For a given equation-of-state parameter w2 = p2/ρ for angular directions, we find the exact solutions of the Einstein equation described by two parameters. We classify the solutions into six types based on the behavior of the metric function. Depending on the parameters, the solutions can have event and cosmological horizons. One of the solution types corresponds to a generalization of the Reissner-Nordstr(o|¨)m black hole, the thermodynamic properties for which are obtained in a simple form. The solutions are stable under radial perturbations. 展开更多
关键词 BLACK HOLE EXACT solution general RELATIVITY
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