scholarly journals PENGARUH VARIASI Electrical Conductivity (EC) LARUTAN NUTRISI HIDROPONIK RAKIT APUNG PADA FASE VEGETATIF CEPAT TERHADAP PERTUMBUHAN DAN HASIL TANAMAN SAWI PAKCOY (Brassica Rapa L.)

AGRIFOR ◽  
2021 ◽  
Vol 20 (2) ◽  
pp. 325
Author(s):  
Evita Eda Efendi ◽  
Djoko Murdono
Keyword(s):  
Electrical Conductivity ◽  
Brassica Rapa

Sawi pakcoy merupakan salah satu jenis sayuran yang mudah dibudidayakan, pakcoy juga banyak dijadikan sebagai peluang bisnis karena peminatnya yang cukup banyak. HIdroponik rakit apung merupakan salah satu teknik budidaya tanaman tanpa media melainkan dengan media udara. Keberhasilan budidaya tanaman secara hidroponik dipengaruhi oleh pengontrolan Konduktivitas Listrik(EC) didalam udara. Penelitian ini bertujuan untuk menetukan pengaruh dan nilai variasi EC yang mampu memberikan pertumbuhan dan hasil terbaik pada tanaman sawi pakcoy yang ditanam secara hidroponik rakit apung. Penelitian menggunakan Rancangan Acak Kelompok (RAK) terdiri dari 5 perlakuan. Masing-masing pengobatan diulang sebanyak 5 kali. Penelitian menunjukkan adanya pengaruh variasi EC dalam larutan hidroponik terhadap pertumbuhan dan tanaman sawi pakcoy pada beberapa parameter pengamatan. Pengaruh perlakuan yang signifikan terdapat pada parameter tinggi tananam, jumlah daun, luas daun, dan berat tanaman segar. Sedangkan total klorofil dan berat kering tanaman tidak menunjukkan adanya perbedaan nyata antar perlakuan. Perlakaun D ((EC 1,6 mS/cm (7-14HSS) dan 2, 4 mS/cm (15-41HSS)) mampu memberikan pertumbuhan dan hasil yang terbaik pada tanaman sawi pakcoy. Perlakuan D memberikan hasil yang berpengaruh nyata pada pengamatan parameter seperti tinggi tanaman, jumlah daun, luas daun, dan berat basah tanaman.

scholarly journals PENGARUH EC SAAT PEMBIBITAN TERHADAP HASIL SAWI (Brassica rapa L.) METODE HIDROPONIK SISTEM APUNG

2020 ◽  
Vol 21 (2) ◽  
pp. 118
Author(s):  
Imam Ifanto
Keyword(s):  
Electrical Conductivity ◽  
Brassica Rapa

Media tanam hidroponik yang tidak mengandung unsur hara dan pemberian nutrisi dengan EC (Electrical Conductivity) yang kurang tepat saat pembibitan mengakibatkan pertumbuhan bibit menjadi lambat, sehingga hasil sawi menjadi kurang maksimal. Penelitian ini untuk menentukan EC saat pembibitan yang memberikan hasil sawi terbaik, serta mengetahui EC saat pembibitan yang menghasilkan sawi tertinggi. Penelitian ini dilaksanakan di Desa Candirejo, Kecamatan Ungaran Barat, Kabupaten Semarang pada bulan Juli hingga Agustus 2018. Rancangan percobaan yang digunakan adalah Rancangan Acak Kelompok dengan 7 perlakuan yaitu  (EC 0 mS),  (EC 0,4 mS),  (EC 0,8 mS), (EC 1,2 mS), (EC 1,6 mS), (EC 2,0 mS), dan (EC 2,4 mS) dan 4 kali ulangan. Parameter pengamatan meliputi tinggi, jumlah daun, luas daun, diameter bonggol, panjang akar, bobot segar atas, dan bobot kering atas. Hasil pengamatan dianalisis menggunakan sidik ragam (uji F 5%). Untuk mengetahui perbedaan antar perlakuan digunakan uji DMRT dengan selang kepercayaan 5%. Hasil penelitian menunjukan  EC 1,74 mS sampai 2,29 mS menghasilkan sawi terbaik dengan tinggi 30,10 cm, jumlah daun 21,5 helai, luas daun 2270,66 cm2, dan diameter bonggol 8,63 cm. EC 2,4 mS menghasilkan sawi tertinggi dengan bobot 322,91 gram. 

Removing Substrate Background in TEM Microanalysis

1974 ◽  
Vol 32 ◽  
pp. 568-569
Author(s):  
John C. Russ ◽  
Nicholas C. Barbi
Keyword(s):  
Electrical Conductivity ◽  
Rapid Growth ◽  
Organic Film ◽  
Absolute Concentration ◽  
Background Signal ◽  
X Ray ◽  
Elemental Concentrations ◽  
Transmission Electron ◽  
Electron Microscopes ◽  
The Continuum

The rapid growth of interest in attaching energy-dispersive x-ray analysis systems to transmission electron microscopes has centered largely on microanalysis of biological specimens. These are frequently either embedded in plastic or supported by an organic film, which is of great importance as regards stability under the beam since it provides thermal and electrical conductivity from the specimen to the grid.Unfortunately, the supporting medium also produces continuum x-radiation or Bremsstrahlung, which is added to the x-ray spectrum from the sample. It is not difficult to separate the characteristic peaks from the elements in the specimen from the total continuum background, but sometimes it is also necessary to separate the continuum due to the sample from that due to the support. For instance, it is possible to compute relative elemental concentrations in the sample, without standards, based on the relative net characteristic elemental intensities without regard to background; but to calculate absolute concentration, it is necessary to use the background signal itself as a measure of the total excited specimen mass.

Macromolecular structures of biological specimens are not obscured by controlled osmium impregnation

1983 ◽  
Vol 41 ◽  
pp. 606-607
Author(s):  
Klaus-Ruediger Peters ◽  
Samuel A. Green
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Critical Point ◽  
Metal Films ◽  
High Magnification ◽  
Osmium Impregnation ◽  
Instrumental Resolution ◽  
20 Nm ◽  
Continuous Metal

High magnification imaging of macromolecules on metal coated biological specimens is limited only by wet preparation procedures since recently obtained instrumental resolution allows visualization of topographic structures as smal l as 1-2 nm. Details of such dimensions may be visualized if continuous metal films with a thickness of 2 nm or less are applied. Such thin films give sufficient contrast in TEM as well as in SEM (SE-I image mode). The requisite increase in electrical conductivity for SEM of biological specimens is achieved through the use of ligand mediated wet osmiuum impregnation of the specimen before critical point (CP) drying. A commonly used ligand is thiocarbohvdrazide (TCH), first introduced to TEM for en block staining of lipids and glvcomacromolecules with osmium black. Now TCH is also used for SEM. However, after ligand mediated osinification nonspecific osmium black precipitates were often found obscuring surface details with large diffuse aggregates or with dense particular deposits, 2-20 nm in size. Thus, only low magnification work was considered possible after TCH appl ication.

Total Body Electrical Conductivity Measurements in the Neonate

1991 ◽  
Vol 18 (3) ◽  
pp. 611-627 ◽  
Author(s):  
Marta L. Fiorotto ◽  
William J. Klish
Keyword(s):  
Electrical Conductivity ◽  
Conductivity Measurements ◽  
Total Body

Effect of MCl (M = Na, K) addition on microstructure and electrical conductivity of forsterite

2020 ◽  
Vol 92 (1) ◽  
pp. 10901
Author(s):  
Saloua El Asri ◽  
Hamid Ahamdane ◽  
Lahoucine Hajji ◽  
Mohamed El Hadri ◽  
Moulay Ahmed El Idrissi Raghni ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electrical Conductivity ◽  
Single Phase ◽  
Sol Gel ◽  
Complex Impedance ◽  
Transmission Spectra ◽  
Electrical Measurements ◽  
Cation Type ◽  
Edx Analyses ◽  
The Fourier Transform

Forsterite single phase powder Mg2SiO4 was synthesized by sol–gel method alongside with heat treatment, using two different cation alkaline salts MCl as mineralizers (M = Na, K) with various mass percentages (2.5, 5, 7.5, and 10 wt.%). In this work, we report on the effect of the cation type and the added amount of used mineralizer on microstructure and electrical conductivity of Mg2SiO4. The formation of forsterite started at 680–740  °C and at 630–700  °C with KCl and NaCl respectively, as shown by TG-DTA and confirmed by XRD. Furthermore, the Fourier transform infrared (FTIR) transmission spectra indicated bands corresponding to vibrations of forsterite structure. The morphology and elemental composition of sintered ceramics were examined by SEM-EDX analyses, while their densities, which were measured by Archimedes method, increased with addition of both alkaline salts. The electrical measurements were performed by Complex Impedance Spectroscopy. The results showed that electrical conductivity increased with the addition of both mineralizers, which was higher for samples prepared with NaCl than those prepared with KCl.

ELECTRICAL CONDUCTIVITY BEHAVIOUR OF Gd DOPED EuO UNDER HYDROSTATIC PRESSURE

1980 ◽  
Vol 41 (C5) ◽  
pp. C5-219-C5-222
Author(s):  
J. P. Desfours ◽  
C. Godart ◽  
J. P. Nadai ◽  
A. Mauger ◽  
G. Weill ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Hydrostatic Pressure ◽  
Conductivity Behaviour

Revisiting the passivation of stainless steels and other passive CRAs

2018 ◽  
Vol 106 (1) ◽  
pp. 107 ◽  
Author(s):  
Jean- Louis Crolet
Keyword(s):  
Electrical Conductivity ◽  
Metal Ions ◽  
Base Metal ◽  
Stainless Steels ◽  
Electronic Conductivity ◽  
Transport Processes ◽  
General Knowledge ◽  
Inorganic Polymers ◽  
Faraday Cage

All that was said so far about passivity and passivation was indeed based on electrochemical prejudgments, and all based on unverified postulates. However, due the authors’ fame and for lack of anything better, the great many contradictions were carefully ignored. However, when resuming from raw experimental facts and the present general knowledge, it now appears that passivation always begins by the precipitation of a metallic hydroxide gel. Therefore, all the protectiveness mechanisms already known for porous corrosion layers apply, so that this outstanding protectiveness is indeed governed by the chemistry of transport processes throughout the entrapped water. For Al type passivation, the base metal ions only have deep and complete electronic shells, which precludes any electronic conductivity. Then protectiveness can only arise from gel thickening and densification. For Fe type passivation, an incomplete shell of superficial 3d electrons allows an early metallic or semimetallic conductivity in the gel skeleton, at the onset of the very first perfectly ordered inorganic polymers (- MII-O-MIII-O-)n. Then all depends on the acquisition, maintenance or loss of a sufficient electrical conductivity in this Faraday cage. But for both types of passive layers, all the known features can be explained by the chemistry of transport processes, with neither exception nor contradiction.

Sign in / Sign up

Export Citation Format

Share Document